drivers/net/ethernet/ibm/ibmvnic.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /**************************************************************************/
   3 /*                                                                        */
   4 /*  IBM System i and System p Virtual NIC Device Driver                   */
   5 /*  Copyright (C) 2014 IBM Corp.                                          */
   6 /*  Santiago Leon (santi_leon@yahoo.com)                                  */
   7 /*  Thomas Falcon (tlfalcon@linux.vnet.ibm.com)                           */
   8 /*  John Allen (jallen@linux.vnet.ibm.com)                                */
   9 /*                                                                        */
  10 /*                                                                        */
  11 /* This module contains the implementation of a virtual ethernet device   */
  12 /* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN    */
  13 /* option of the RS/6000 Platform Architecture to interface with virtual  */
  14 /* ethernet NICs that are presented to the partition by the hypervisor.   */
  15 /*                                                                         */
  16 /* Messages are passed between the VNIC driver and the VNIC server using  */
  17 /* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to  */
  18 /* issue and receive commands that initiate communication with the server */
  19 /* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but    */
  20 /* are used by the driver to notify the server that a packet is           */
  21 /* ready for transmission or that a buffer has been added to receive a    */
  22 /* packet. Subsequently, sCRQs are used by the server to notify the       */
  23 /* driver that a packet transmission has been completed or that a packet  */
  24 /* has been received and placed in a waiting buffer.                      */
  25 /*                                                                        */
  26 /* In lieu of a more conventional "on-the-fly" DMA mapping strategy in    */
  27 /* which skbs are DMA mapped and immediately unmapped when the transmit   */
  28 /* or receive has been completed, the VNIC driver is required to use      */
  29 /* "long term mapping". This entails that large, continuous DMA mapped    */
  30 /* buffers are allocated on driver initialization and these buffers are   */
  31 /* then continuously reused to pass skbs to and from the VNIC server.     */
  32 /*                                                                        */
  33 /**************************************************************************/
  34
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/types.h>
  38 #include <linux/errno.h>
  39 #include <linux/completion.h>
  40 #include <linux/ioport.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/kernel.h>
  43 #include <linux/netdevice.h>
  44 #include <linux/etherdevice.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/init.h>
  47 #include <linux/delay.h>
  48 #include <linux/mm.h>
  49 #include <linux/ethtool.h>
  50 #include <linux/proc_fs.h>
  51 #include <linux/if_arp.h>
  52 #include <linux/in.h>
  53 #include <linux/ip.h>
  54 #include <linux/ipv6.h>
  55 #include <linux/irq.h>
  56 #include <linux/kthread.h>
  57 #include <linux/seq_file.h>
  58 #include <linux/interrupt.h>
  59 #include <net/net_namespace.h>
  60 #include <asm/hvcall.h>
  61 #include <linux/atomic.h>
  62 #include <asm/vio.h>
  63 #include <asm/xive.h>
  64 #include <asm/iommu.h>
  65 #include <linux/uaccess.h>
  66 #include <asm/firmware.h>
  67 #include <linux/workqueue.h>
  68 #include <linux/if_vlan.h>
  69 #include <linux/utsname.h>
  70
  71 #include "ibmvnic.h"
  72
  73 static const char ibmvnic_driver_name[] = "ibmvnic";
  74 static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";
  75
  76 MODULE_AUTHOR("Santiago Leon");
  77 MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
  78 MODULE_LICENSE("GPL");
  79 MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
  80
  81 static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
  82 static void release_sub_crqs(struct ibmvnic_adapter *, bool);
  83 static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
  84 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
  85 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
  86 static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
  87 static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
  88 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
  89 static int enable_scrq_irq(struct ibmvnic_adapter *,
  90                            struct ibmvnic_sub_crq_queue *);
  91 static int disable_scrq_irq(struct ibmvnic_adapter *,
  92                             struct ibmvnic_sub_crq_queue *);
  93 static int pending_scrq(struct ibmvnic_adapter *,
  94                         struct ibmvnic_sub_crq_queue *);
  95 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
  96                                         struct ibmvnic_sub_crq_queue *);
  97 static int ibmvnic_poll(struct napi_struct *napi, int data);
  98 static void send_query_map(struct ibmvnic_adapter *adapter);
  99 static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8);
 100 static int send_request_unmap(struct ibmvnic_adapter *, u8);
 101 static int send_login(struct ibmvnic_adapter *adapter);
 102 static void send_query_cap(struct ibmvnic_adapter *adapter);
 103 static int init_sub_crqs(struct ibmvnic_adapter *);
 104 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
 105 static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
 106 static void release_crq_queue(struct ibmvnic_adapter *);
 107 static int __ibmvnic_set_mac(struct net_device *, u8 *);
 108 static int init_crq_queue(struct ibmvnic_adapter *adapter);
 109 static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
 110 static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
 111                                          struct ibmvnic_sub_crq_queue *tx_scrq);
 112 static void free_long_term_buff(struct ibmvnic_adapter *adapter,
 113                                 struct ibmvnic_long_term_buff *ltb);
 114 static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter);
 115
 116 struct ibmvnic_stat {
 117         char name[ETH_GSTRING_LEN];
 118         int offset;
 119 };
 120
 121 #define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
 122                              offsetof(struct ibmvnic_statistics, stat))
 123 #define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))
 124
 125 static const struct ibmvnic_stat ibmvnic_stats[] = {
 126         {"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
 127         {"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
 128         {"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
 129         {"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
 130         {"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
 131         {"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
 132         {"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
 133         {"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
 134         {"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
 135         {"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
 136         {"align_errors", IBMVNIC_STAT_OFF(align_errors)},
 137         {"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
 138         {"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
 139         {"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
 140         {"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
 141         {"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
 142         {"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
 143         {"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
 144         {"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
 145         {"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
 146         {"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
 147         {"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
 148 };
 149
 150 static int send_crq_init_complete(struct ibmvnic_adapter *adapter)
 151 {
 152         union ibmvnic_crq crq;
 153
 154         memset(&crq, 0, sizeof(crq));
 155         crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
 156         crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE;
 157
 158         return ibmvnic_send_crq(adapter, &crq);
 159 }
 160
 161 static int send_version_xchg(struct ibmvnic_adapter *adapter)
 162 {
 163         union ibmvnic_crq crq;
 164
 165         memset(&crq, 0, sizeof(crq));
 166         crq.version_exchange.first = IBMVNIC_CRQ_CMD;
 167         crq.version_exchange.cmd = VERSION_EXCHANGE;
 168         crq.version_exchange.version = cpu_to_be16(ibmvnic_version);
 169
 170         return ibmvnic_send_crq(adapter, &crq);
 171 }
 172
 173 static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
 174                           unsigned long length, unsigned long *number,
 175                           unsigned long *irq)
 176 {
 177         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
 178         long rc;
 179
 180         rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
 181         *number = retbuf[0];
 182         *irq = retbuf[1];
 183
 184         return rc;
 185 }
 186
 187 /**
 188  * ibmvnic_wait_for_completion - Check device state and wait for completion
 189  * @adapter: private device data
 190  * @comp_done: completion structure to wait for
 191  * @timeout: time to wait in milliseconds
 192  *
 193  * Wait for a completion signal or until the timeout limit is reached
 194  * while checking that the device is still active.
 195  */
 196 static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
 197                                        struct completion *comp_done,
 198                                        unsigned long timeout)
 199 {
 200         struct net_device *netdev;
 201         unsigned long div_timeout;
 202         u8 retry;
 203
 204         netdev = adapter->netdev;
 205         retry = 5;
 206         div_timeout = msecs_to_jiffies(timeout / retry);
 207         while (true) {
 208                 if (!adapter->crq.active) {
 209                         netdev_err(netdev, "Device down!\n");
 210                         return -ENODEV;
 211                 }
 212                 if (!retry--)
 213                         break;
 214                 if (wait_for_completion_timeout(comp_done, div_timeout))
 215                         return 0;
 216         }
 217         netdev_err(netdev, "Operation timed out.\n");
 218         return -ETIMEDOUT;
 219 }
 220
 221 /**
 222  * reuse_ltb() - Check if a long term buffer can be reused
 223  * @ltb:  The long term buffer to be checked
 224  * @size: The size of the long term buffer.
 225  *
 226  * An LTB can be reused unless its size has changed.
 227  *
 228  * Return: Return true if the LTB can be reused, false otherwise.
 229  */
 230 static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size)
 231 {
 232         return (ltb->buff && ltb->size == size);
 233 }
 234
 235 /**
 236  * alloc_long_term_buff() - Allocate a long term buffer (LTB)
 237  *
 238  * @adapter: ibmvnic adapter associated to the LTB
 239  * @ltb:     container object for the LTB
 240  * @size:    size of the LTB
 241  *
 242  * Allocate an LTB of the specified size and notify VIOS.
 243  *
 244  * If the given @ltb already has the correct size, reuse it. Otherwise if
 245  * its non-NULL, free it. Then allocate a new one of the correct size.
 246  * Notify the VIOS either way since we may now be working with a new VIOS.
 247  *
 248  * Allocating larger chunks of memory during resets, specially LPM or under
 249  * low memory situations can cause resets to fail/timeout and for LPAR to
 250  * lose connectivity. So hold onto the LTB even if we fail to communicate
 251  * with the VIOS and reuse it on next open. Free LTB when adapter is closed.
 252  *
 253  * Return: 0 if we were able to allocate the LTB and notify the VIOS and
 254  *         a negative value otherwise.
 255  */
 256 static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
 257                                 struct ibmvnic_long_term_buff *ltb, int size)
 258 {
 259         struct device *dev = &adapter->vdev->dev;
 260         int rc;
 261
 262         if (!reuse_ltb(ltb, size)) {
 263                 dev_dbg(dev,
 264                         "LTB size changed from 0x%llx to 0x%x, reallocating\n",
 265                          ltb->size, size);
 266                 free_long_term_buff(adapter, ltb);
 267         }
 268
 269         if (ltb->buff) {
 270                 dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n",
 271                         ltb->map_id, ltb->size);
 272         } else {
 273                 ltb->buff = dma_alloc_coherent(dev, size, &ltb->addr,
 274                                                GFP_KERNEL);
 275                 if (!ltb->buff) {
 276                         dev_err(dev, "Couldn't alloc long term buffer\n");
 277                         return -ENOMEM;
 278                 }
 279                 ltb->size = size;
 280
 281                 ltb->map_id = find_first_zero_bit(adapter->map_ids,
 282                                                   MAX_MAP_ID);
 283                 bitmap_set(adapter->map_ids, ltb->map_id, 1);
 284
 285                 dev_dbg(dev,
 286                         "Allocated new LTB [map %d, size 0x%llx]\n",
 287                          ltb->map_id, ltb->size);
 288         }
 289
 290         /* Ensure ltb is zeroed - specially when reusing it. */
 291         memset(ltb->buff, 0, ltb->size);
 292
 293         mutex_lock(&adapter->fw_lock);
 294         adapter->fw_done_rc = 0;
 295         reinit_completion(&adapter->fw_done);
 296
 297         rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
 298         if (rc) {
 299                 dev_err(dev, "send_request_map failed, rc = %d\n", rc);
 300                 goto out;
 301         }
 302
 303         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
 304         if (rc) {
 305                 dev_err(dev, "LTB map request aborted or timed out, rc = %d\n",
 306                         rc);
 307                 goto out;
 308         }
 309
 310         if (adapter->fw_done_rc) {
 311                 dev_err(dev, "Couldn't map LTB, rc = %d\n",
 312                         adapter->fw_done_rc);
 313                 rc = -EIO;
 314                 goto out;
 315         }
 316         rc = 0;
 317 out:
 318         /* don't free LTB on communication error - see function header */
 319         mutex_unlock(&adapter->fw_lock);
 320         return rc;
 321 }
 322
 323 static void free_long_term_buff(struct ibmvnic_adapter *adapter,
 324                                 struct ibmvnic_long_term_buff *ltb)
 325 {
 326         struct device *dev = &adapter->vdev->dev;
 327
 328         if (!ltb->buff)
 329                 return;
 330
 331         /* VIOS automatically unmaps the long term buffer at remote
 332          * end for the following resets:
 333          * FAILOVER, MOBILITY, TIMEOUT.
 334          */
 335         if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
 336             adapter->reset_reason != VNIC_RESET_MOBILITY &&
 337             adapter->reset_reason != VNIC_RESET_TIMEOUT)
 338                 send_request_unmap(adapter, ltb->map_id);
 339
 340         dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
 341
 342         ltb->buff = NULL;
 343         /* mark this map_id free */
 344         bitmap_clear(adapter->map_ids, ltb->map_id, 1);
 345         ltb->map_id = 0;
 346 }
 347
 348 static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
 349 {
 350         int i;
 351
 352         for (i = 0; i < adapter->num_active_rx_pools; i++)
 353                 adapter->rx_pool[i].active = 0;
 354 }
 355
 356 static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
 357                               struct ibmvnic_rx_pool *pool)
 358 {
 359         int count = pool->size - atomic_read(&pool->available);
 360         u64 handle = adapter->rx_scrq[pool->index]->handle;
 361         struct device *dev = &adapter->vdev->dev;
 362         struct ibmvnic_ind_xmit_queue *ind_bufp;
 363         struct ibmvnic_sub_crq_queue *rx_scrq;
 364         union sub_crq *sub_crq;
 365         int buffers_added = 0;
 366         unsigned long lpar_rc;
 367         struct sk_buff *skb;
 368         unsigned int offset;
 369         dma_addr_t dma_addr;
 370         unsigned char *dst;
 371         int shift = 0;
 372         int index;
 373         int i;
 374
 375         if (!pool->active)
 376                 return;
 377
 378         rx_scrq = adapter->rx_scrq[pool->index];
 379         ind_bufp = &rx_scrq->ind_buf;
 380
 381         /* netdev_skb_alloc() could have failed after we saved a few skbs
 382          * in the indir_buf and we would not have sent them to VIOS yet.
 383          * To account for them, start the loop at ind_bufp->index rather
 384          * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will
 385          * be 0.
 386          */
 387         for (i = ind_bufp->index; i < count; ++i) {
 388                 index = pool->free_map[pool->next_free];
 389
 390                 /* We maybe reusing the skb from earlier resets. Allocate
 391                  * only if necessary. But since the LTB may have changed
 392                  * during reset (see init_rx_pools()), update LTB below
 393                  * even if reusing skb.
 394                  */
 395                 skb = pool->rx_buff[index].skb;
 396                 if (!skb) {
 397                         skb = netdev_alloc_skb(adapter->netdev,
 398                                                pool->buff_size);
 399                         if (!skb) {
 400                                 dev_err(dev, "Couldn't replenish rx buff\n");
 401                                 adapter->replenish_no_mem++;
 402                                 break;
 403                         }
 404                 }
 405
 406                 pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
 407                 pool->next_free = (pool->next_free + 1) % pool->size;
 408
 409                 /* Copy the skb to the long term mapped DMA buffer */
 410                 offset = index * pool->buff_size;
 411                 dst = pool->long_term_buff.buff + offset;
 412                 memset(dst, 0, pool->buff_size);
 413                 dma_addr = pool->long_term_buff.addr + offset;
 414
 415                 /* add the skb to an rx_buff in the pool */
 416                 pool->rx_buff[index].data = dst;
 417                 pool->rx_buff[index].dma = dma_addr;
 418                 pool->rx_buff[index].skb = skb;
 419                 pool->rx_buff[index].pool_index = pool->index;
 420                 pool->rx_buff[index].size = pool->buff_size;
 421
 422                 /* queue the rx_buff for the next send_subcrq_indirect */
 423                 sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
 424                 memset(sub_crq, 0, sizeof(*sub_crq));
 425                 sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
 426                 sub_crq->rx_add.correlator =
 427                     cpu_to_be64((u64)&pool->rx_buff[index]);
 428                 sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
 429                 sub_crq->rx_add.map_id = pool->long_term_buff.map_id;
 430
 431                 /* The length field of the sCRQ is defined to be 24 bits so the
 432                  * buffer size needs to be left shifted by a byte before it is
 433                  * converted to big endian to prevent the last byte from being
 434                  * truncated.
 435                  */
 436 #ifdef __LITTLE_ENDIAN__
 437                 shift = 8;
 438 #endif
 439                 sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
 440
 441                 /* if send_subcrq_indirect queue is full, flush to VIOS */
 442                 if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
 443                     i == count - 1) {
 444                         lpar_rc =
 445                                 send_subcrq_indirect(adapter, handle,
 446                                                      (u64)ind_bufp->indir_dma,
 447                                                      (u64)ind_bufp->index);
 448                         if (lpar_rc != H_SUCCESS)
 449                                 goto failure;
 450                         buffers_added += ind_bufp->index;
 451                         adapter->replenish_add_buff_success += ind_bufp->index;
 452                         ind_bufp->index = 0;
 453                 }
 454         }
 455         atomic_add(buffers_added, &pool->available);
 456         return;
 457
 458 failure:
 459         if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
 460                 dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
 461         for (i = ind_bufp->index - 1; i >= 0; --i) {
 462                 struct ibmvnic_rx_buff *rx_buff;
 463
 464                 pool->next_free = pool->next_free == 0 ?
 465                                   pool->size - 1 : pool->next_free - 1;
 466                 sub_crq = &ind_bufp->indir_arr[i];
 467                 rx_buff = (struct ibmvnic_rx_buff *)
 468                                 be64_to_cpu(sub_crq->rx_add.correlator);
 469                 index = (int)(rx_buff - pool->rx_buff);
 470                 pool->free_map[pool->next_free] = index;
 471                 dev_kfree_skb_any(pool->rx_buff[index].skb);
 472                 pool->rx_buff[index].skb = NULL;
 473         }
 474         adapter->replenish_add_buff_failure += ind_bufp->index;
 475         atomic_add(buffers_added, &pool->available);
 476         ind_bufp->index = 0;
 477         if (lpar_rc == H_CLOSED || adapter->failover_pending) {
 478                 /* Disable buffer pool replenishment and report carrier off if
 479                  * queue is closed or pending failover.
 480                  * Firmware guarantees that a signal will be sent to the
 481                  * driver, triggering a reset.
 482                  */
 483                 deactivate_rx_pools(adapter);
 484                 netif_carrier_off(adapter->netdev);
 485         }
 486 }
 487
 488 static void replenish_pools(struct ibmvnic_adapter *adapter)
 489 {
 490         int i;
 491
 492         adapter->replenish_task_cycles++;
 493         for (i = 0; i < adapter->num_active_rx_pools; i++) {
 494                 if (adapter->rx_pool[i].active)
 495                         replenish_rx_pool(adapter, &adapter->rx_pool[i]);
 496         }
 497
 498         netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
 499 }
 500
 501 static void release_stats_buffers(struct ibmvnic_adapter *adapter)
 502 {
 503         kfree(adapter->tx_stats_buffers);
 504         kfree(adapter->rx_stats_buffers);
 505         adapter->tx_stats_buffers = NULL;
 506         adapter->rx_stats_buffers = NULL;
 507 }
 508
 509 static int init_stats_buffers(struct ibmvnic_adapter *adapter)
 510 {
 511         adapter->tx_stats_buffers =
 512                                 kcalloc(IBMVNIC_MAX_QUEUES,
 513                                         sizeof(struct ibmvnic_tx_queue_stats),
 514                                         GFP_KERNEL);
 515         if (!adapter->tx_stats_buffers)
 516                 return -ENOMEM;
 517
 518         adapter->rx_stats_buffers =
 519                                 kcalloc(IBMVNIC_MAX_QUEUES,
 520                                         sizeof(struct ibmvnic_rx_queue_stats),
 521                                         GFP_KERNEL);
 522         if (!adapter->rx_stats_buffers)
 523                 return -ENOMEM;
 524
 525         return 0;
 526 }
 527
 528 static void release_stats_token(struct ibmvnic_adapter *adapter)
 529 {
 530         struct device *dev = &adapter->vdev->dev;
 531
 532         if (!adapter->stats_token)
 533                 return;
 534
 535         dma_unmap_single(dev, adapter->stats_token,
 536                          sizeof(struct ibmvnic_statistics),
 537                          DMA_FROM_DEVICE);
 538         adapter->stats_token = 0;
 539 }
 540
 541 static int init_stats_token(struct ibmvnic_adapter *adapter)
 542 {
 543         struct device *dev = &adapter->vdev->dev;
 544         dma_addr_t stok;
 545         int rc;
 546
 547         stok = dma_map_single(dev, &adapter->stats,
 548                               sizeof(struct ibmvnic_statistics),
 549                               DMA_FROM_DEVICE);
 550         rc = dma_mapping_error(dev, stok);
 551         if (rc) {
 552                 dev_err(dev, "Couldn't map stats buffer, rc = %d\n", rc);
 553                 return rc;
 554         }
 555
 556         adapter->stats_token = stok;
 557         netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
 558         return 0;
 559 }
 560
 561 /**
 562  * release_rx_pools() - Release any rx pools attached to @adapter.
 563  * @adapter: ibmvnic adapter
 564  *
 565  * Safe to call this multiple times - even if no pools are attached.
 566  */
 567 static void release_rx_pools(struct ibmvnic_adapter *adapter)
 568 {
 569         struct ibmvnic_rx_pool *rx_pool;
 570         int i, j;
 571
 572         if (!adapter->rx_pool)
 573                 return;
 574
 575         for (i = 0; i < adapter->num_active_rx_pools; i++) {
 576                 rx_pool = &adapter->rx_pool[i];
 577
 578                 netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
 579
 580                 kfree(rx_pool->free_map);
 581
 582                 free_long_term_buff(adapter, &rx_pool->long_term_buff);
 583
 584                 if (!rx_pool->rx_buff)
 585                         continue;
 586
 587                 for (j = 0; j < rx_pool->size; j++) {
 588                         if (rx_pool->rx_buff[j].skb) {
 589                                 dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
 590                                 rx_pool->rx_buff[j].skb = NULL;
 591                         }
 592                 }
 593
 594                 kfree(rx_pool->rx_buff);
 595         }
 596
 597         kfree(adapter->rx_pool);
 598         adapter->rx_pool = NULL;
 599         adapter->num_active_rx_pools = 0;
 600         adapter->prev_rx_pool_size = 0;
 601 }
 602
 603 /**
 604  * reuse_rx_pools() - Check if the existing rx pools can be reused.
 605  * @adapter: ibmvnic adapter
 606  *
 607  * Check if the existing rx pools in the adapter can be reused. The
 608  * pools can be reused if the pool parameters (number of pools,
 609  * number of buffers in the pool and size of each buffer) have not
 610  * changed.
 611  *
 612  * NOTE: This assumes that all pools have the same number of buffers
 613  *       which is the case currently. If that changes, we must fix this.
 614  *
 615  * Return: true if the rx pools can be reused, false otherwise.
 616  */
 617 static bool reuse_rx_pools(struct ibmvnic_adapter *adapter)
 618 {
 619         u64 old_num_pools, new_num_pools;
 620         u64 old_pool_size, new_pool_size;
 621         u64 old_buff_size, new_buff_size;
 622
 623         if (!adapter->rx_pool)
 624                 return false;
 625
 626         old_num_pools = adapter->num_active_rx_pools;
 627         new_num_pools = adapter->req_rx_queues;
 628
 629         old_pool_size = adapter->prev_rx_pool_size;
 630         new_pool_size = adapter->req_rx_add_entries_per_subcrq;
 631
 632         old_buff_size = adapter->prev_rx_buf_sz;
 633         new_buff_size = adapter->cur_rx_buf_sz;
 634
 635         if (old_buff_size != new_buff_size ||
 636             old_num_pools != new_num_pools ||
 637             old_pool_size != new_pool_size)
 638                 return false;
 639
 640         return true;
 641 }
 642
 643 /**
 644  * init_rx_pools(): Initialize the set of receiver pools in the adapter.
 645  * @netdev: net device associated with the vnic interface
 646  *
 647  * Initialize the set of receiver pools in the ibmvnic adapter associated
 648  * with the net_device @netdev. If possible, reuse the existing rx pools.
 649  * Otherwise free any existing pools and  allocate a new set of pools
 650  * before initializing them.
 651  *
 652  * Return: 0 on success and negative value on error.
 653  */
 654 static int init_rx_pools(struct net_device *netdev)
 655 {
 656         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 657         struct device *dev = &adapter->vdev->dev;
 658         struct ibmvnic_rx_pool *rx_pool;
 659         u64 num_pools;
 660         u64 pool_size;          /* # of buffers in one pool */
 661         u64 buff_size;
 662         int i, j, rc;
 663
 664         pool_size = adapter->req_rx_add_entries_per_subcrq;
 665         num_pools = adapter->req_rx_queues;
 666         buff_size = adapter->cur_rx_buf_sz;
 667
 668         if (reuse_rx_pools(adapter)) {
 669                 dev_dbg(dev, "Reusing rx pools\n");
 670                 goto update_ltb;
 671         }
 672
 673         /* Allocate/populate the pools. */
 674         release_rx_pools(adapter);
 675
 676         adapter->rx_pool = kcalloc(num_pools,
 677                                    sizeof(struct ibmvnic_rx_pool),
 678                                    GFP_KERNEL);
 679         if (!adapter->rx_pool) {
 680                 dev_err(dev, "Failed to allocate rx pools\n");
 681                 return -ENOMEM;
 682         }
 683
 684         /* Set num_active_rx_pools early. If we fail below after partial
 685          * allocation, release_rx_pools() will know how many to look for.
 686          */
 687         adapter->num_active_rx_pools = num_pools;
 688
 689         for (i = 0; i < num_pools; i++) {
 690                 rx_pool = &adapter->rx_pool[i];
 691
 692                 netdev_dbg(adapter->netdev,
 693                            "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
 694                            i, pool_size, buff_size);
 695
 696                 rx_pool->size = pool_size;
 697                 rx_pool->index = i;
 698                 rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 699
 700                 rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
 701                                             GFP_KERNEL);
 702                 if (!rx_pool->free_map) {
 703                         dev_err(dev, "Couldn't alloc free_map %d\n", i);
 704                         rc = -ENOMEM;
 705                         goto out_release;
 706                 }
 707
 708                 rx_pool->rx_buff = kcalloc(rx_pool->size,
 709                                            sizeof(struct ibmvnic_rx_buff),
 710                                            GFP_KERNEL);
 711                 if (!rx_pool->rx_buff) {
 712                         dev_err(dev, "Couldn't alloc rx buffers\n");
 713                         rc = -ENOMEM;
 714                         goto out_release;
 715                 }
 716         }
 717
 718         adapter->prev_rx_pool_size = pool_size;
 719         adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz;
 720
 721 update_ltb:
 722         for (i = 0; i < num_pools; i++) {
 723                 rx_pool = &adapter->rx_pool[i];
 724                 dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n",
 725                         i, rx_pool->size, rx_pool->buff_size);
 726
 727                 rc = alloc_long_term_buff(adapter, &rx_pool->long_term_buff,
 728                                           rx_pool->size * rx_pool->buff_size);
 729                 if (rc)
 730                         goto out;
 731
 732                 for (j = 0; j < rx_pool->size; ++j) {
 733                         struct ibmvnic_rx_buff *rx_buff;
 734
 735                         rx_pool->free_map[j] = j;
 736
 737                         /* NOTE: Don't clear rx_buff->skb here - will leak
 738                          * memory! replenish_rx_pool() will reuse skbs or
 739                          * allocate as necessary.
 740                          */
 741                         rx_buff = &rx_pool->rx_buff[j];
 742                         rx_buff->dma = 0;
 743                         rx_buff->data = 0;
 744                         rx_buff->size = 0;
 745                         rx_buff->pool_index = 0;
 746                 }
 747
 748                 /* Mark pool "empty" so replenish_rx_pools() will
 749                  * update the LTB info for each buffer
 750                  */
 751                 atomic_set(&rx_pool->available, 0);
 752                 rx_pool->next_alloc = 0;
 753                 rx_pool->next_free = 0;
 754                 /* replenish_rx_pool() may have called deactivate_rx_pools()
 755                  * on failover. Ensure pool is active now.
 756                  */
 757                 rx_pool->active = 1;
 758         }
 759         return 0;
 760 out_release:
 761         release_rx_pools(adapter);
 762 out:
 763         /* We failed to allocate one or more LTBs or map them on the VIOS.
 764          * Hold onto the pools and any LTBs that we did allocate/map.
 765          */
 766         return rc;
 767 }
 768
 769 static void release_vpd_data(struct ibmvnic_adapter *adapter)
 770 {
 771         if (!adapter->vpd)
 772                 return;
 773
 774         kfree(adapter->vpd->buff);
 775         kfree(adapter->vpd);
 776
 777         adapter->vpd = NULL;
 778 }
 779
 780 static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
 781                                 struct ibmvnic_tx_pool *tx_pool)
 782 {
 783         kfree(tx_pool->tx_buff);
 784         kfree(tx_pool->free_map);
 785         free_long_term_buff(adapter, &tx_pool->long_term_buff);
 786 }
 787
 788 /**
 789  * release_tx_pools() - Release any tx pools attached to @adapter.
 790  * @adapter: ibmvnic adapter
 791  *
 792  * Safe to call this multiple times - even if no pools are attached.
 793  */
 794 static void release_tx_pools(struct ibmvnic_adapter *adapter)
 795 {
 796         int i;
 797
 798         /* init_tx_pools() ensures that ->tx_pool and ->tso_pool are
 799          * both NULL or both non-NULL. So we only need to check one.
 800          */
 801         if (!adapter->tx_pool)
 802                 return;
 803
 804         for (i = 0; i < adapter->num_active_tx_pools; i++) {
 805                 release_one_tx_pool(adapter, &adapter->tx_pool[i]);
 806                 release_one_tx_pool(adapter, &adapter->tso_pool[i]);
 807         }
 808
 809         kfree(adapter->tx_pool);
 810         adapter->tx_pool = NULL;
 811         kfree(adapter->tso_pool);
 812         adapter->tso_pool = NULL;
 813         adapter->num_active_tx_pools = 0;
 814         adapter->prev_tx_pool_size = 0;
 815 }
 816
 817 static int init_one_tx_pool(struct net_device *netdev,
 818                             struct ibmvnic_tx_pool *tx_pool,
 819                             int pool_size, int buf_size)
 820 {
 821         int i;
 822
 823         tx_pool->tx_buff = kcalloc(pool_size,
 824                                    sizeof(struct ibmvnic_tx_buff),
 825                                    GFP_KERNEL);
 826         if (!tx_pool->tx_buff)
 827                 return -ENOMEM;
 828
 829         tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL);
 830         if (!tx_pool->free_map) {
 831                 kfree(tx_pool->tx_buff);
 832                 tx_pool->tx_buff = NULL;
 833                 return -ENOMEM;
 834         }
 835
 836         for (i = 0; i < pool_size; i++)
 837                 tx_pool->free_map[i] = i;
 838
 839         tx_pool->consumer_index = 0;
 840         tx_pool->producer_index = 0;
 841         tx_pool->num_buffers = pool_size;
 842         tx_pool->buf_size = buf_size;
 843
 844         return 0;
 845 }
 846
 847 /**
 848  * reuse_tx_pools() - Check if the existing tx pools can be reused.
 849  * @adapter: ibmvnic adapter
 850  *
 851  * Check if the existing tx pools in the adapter can be reused. The
 852  * pools can be reused if the pool parameters (number of pools,
 853  * number of buffers in the pool and mtu) have not changed.
 854  *
 855  * NOTE: This assumes that all pools have the same number of buffers
 856  *       which is the case currently. If that changes, we must fix this.
 857  *
 858  * Return: true if the tx pools can be reused, false otherwise.
 859  */
 860 static bool reuse_tx_pools(struct ibmvnic_adapter *adapter)
 861 {
 862         u64 old_num_pools, new_num_pools;
 863         u64 old_pool_size, new_pool_size;
 864         u64 old_mtu, new_mtu;
 865
 866         if (!adapter->tx_pool)
 867                 return false;
 868
 869         old_num_pools = adapter->num_active_tx_pools;
 870         new_num_pools = adapter->num_active_tx_scrqs;
 871         old_pool_size = adapter->prev_tx_pool_size;
 872         new_pool_size = adapter->req_tx_entries_per_subcrq;
 873         old_mtu = adapter->prev_mtu;
 874         new_mtu = adapter->req_mtu;
 875
 876         if (old_mtu != new_mtu ||
 877             old_num_pools != new_num_pools ||
 878             old_pool_size != new_pool_size)
 879                 return false;
 880
 881         return true;
 882 }
 883
 884 /**
 885  * init_tx_pools(): Initialize the set of transmit pools in the adapter.
 886  * @netdev: net device associated with the vnic interface
 887  *
 888  * Initialize the set of transmit pools in the ibmvnic adapter associated
 889  * with the net_device @netdev. If possible, reuse the existing tx pools.
 890  * Otherwise free any existing pools and  allocate a new set of pools
 891  * before initializing them.
 892  *
 893  * Return: 0 on success and negative value on error.
 894  */
 895 static int init_tx_pools(struct net_device *netdev)
 896 {
 897         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
 898         struct device *dev = &adapter->vdev->dev;
 899         int num_pools;
 900         u64 pool_size;          /* # of buffers in pool */
 901         u64 buff_size;
 902         int i, j, rc;
 903
 904         num_pools = adapter->req_tx_queues;
 905
 906         /* We must notify the VIOS about the LTB on all resets - but we only
 907          * need to alloc/populate pools if either the number of buffers or
 908          * size of each buffer in the pool has changed.
 909          */
 910         if (reuse_tx_pools(adapter)) {
 911                 netdev_dbg(netdev, "Reusing tx pools\n");
 912                 goto update_ltb;
 913         }
 914
 915         /* Allocate/populate the pools. */
 916         release_tx_pools(adapter);
 917
 918         pool_size = adapter->req_tx_entries_per_subcrq;
 919         num_pools = adapter->num_active_tx_scrqs;
 920
 921         adapter->tx_pool = kcalloc(num_pools,
 922                                    sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
 923         if (!adapter->tx_pool)
 924                 return -ENOMEM;
 925
 926         adapter->tso_pool = kcalloc(num_pools,
 927                                     sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
 928         /* To simplify release_tx_pools() ensure that ->tx_pool and
 929          * ->tso_pool are either both NULL or both non-NULL.
 930          */
 931         if (!adapter->tso_pool) {
 932                 kfree(adapter->tx_pool);
 933                 adapter->tx_pool = NULL;
 934                 return -ENOMEM;
 935         }
 936
 937         /* Set num_active_tx_pools early. If we fail below after partial
 938          * allocation, release_tx_pools() will know how many to look for.
 939          */
 940         adapter->num_active_tx_pools = num_pools;
 941
 942         buff_size = adapter->req_mtu + VLAN_HLEN;
 943         buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
 944
 945         for (i = 0; i < num_pools; i++) {
 946                 dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n",
 947                         i, adapter->req_tx_entries_per_subcrq, buff_size);
 948
 949                 rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
 950                                       pool_size, buff_size);
 951                 if (rc)
 952                         goto out_release;
 953
 954                 rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
 955                                       IBMVNIC_TSO_BUFS,
 956                                       IBMVNIC_TSO_BUF_SZ);
 957                 if (rc)
 958                         goto out_release;
 959         }
 960
 961         adapter->prev_tx_pool_size = pool_size;
 962         adapter->prev_mtu = adapter->req_mtu;
 963
 964 update_ltb:
 965         /* NOTE: All tx_pools have the same number of buffers (which is
 966          *       same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS
 967          *       buffers (see calls init_one_tx_pool() for these).
 968          *       For consistency, we use tx_pool->num_buffers and
 969          *       tso_pool->num_buffers below.
 970          */
 971         rc = -1;
 972         for (i = 0; i < num_pools; i++) {
 973                 struct ibmvnic_tx_pool *tso_pool;
 974                 struct ibmvnic_tx_pool *tx_pool;
 975                 u32 ltb_size;
 976
 977                 tx_pool = &adapter->tx_pool[i];
 978                 ltb_size = tx_pool->num_buffers * tx_pool->buf_size;
 979                 if (alloc_long_term_buff(adapter, &tx_pool->long_term_buff,
 980                                          ltb_size))
 981                         goto out;
 982
 983                 dev_dbg(dev, "Updated LTB for tx pool %d [%p, %d, %d]\n",
 984                         i, tx_pool->long_term_buff.buff,
 985                         tx_pool->num_buffers, tx_pool->buf_size);
 986
 987                 tx_pool->consumer_index = 0;
 988                 tx_pool->producer_index = 0;
 989
 990                 for (j = 0; j < tx_pool->num_buffers; j++)
 991                         tx_pool->free_map[j] = j;
 992
 993                 tso_pool = &adapter->tso_pool[i];
 994                 ltb_size = tso_pool->num_buffers * tso_pool->buf_size;
 995                 if (alloc_long_term_buff(adapter, &tso_pool->long_term_buff,
 996                                          ltb_size))
 997                         goto out;
 998
 999                 dev_dbg(dev, "Updated LTB for tso pool %d [%p, %d, %d]\n",
1000                         i, tso_pool->long_term_buff.buff,
1001                         tso_pool->num_buffers, tso_pool->buf_size);
1002
1003                 tso_pool->consumer_index = 0;
1004                 tso_pool->producer_index = 0;
1005
1006                 for (j = 0; j < tso_pool->num_buffers; j++)
1007                         tso_pool->free_map[j] = j;
1008         }
1009
1010         return 0;
1011 out_release:
1012         release_tx_pools(adapter);
1013 out:
1014         /* We failed to allocate one or more LTBs or map them on the VIOS.
1015          * Hold onto the pools and any LTBs that we did allocate/map.
1016          */
1017         return rc;
1018 }
1019
1020 static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
1021 {
1022         int i;
1023
1024         if (adapter->napi_enabled)
1025                 return;
1026
1027         for (i = 0; i < adapter->req_rx_queues; i++)
1028                 napi_enable(&adapter->napi[i]);
1029
1030         adapter->napi_enabled = true;
1031 }
1032
1033 static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
1034 {
1035         int i;
1036
1037         if (!adapter->napi_enabled)
1038                 return;
1039
1040         for (i = 0; i < adapter->req_rx_queues; i++) {
1041                 netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
1042                 napi_disable(&adapter->napi[i]);
1043         }
1044
1045         adapter->napi_enabled = false;
1046 }
1047
1048 static int init_napi(struct ibmvnic_adapter *adapter)
1049 {
1050         int i;
1051
1052         adapter->napi = kcalloc(adapter->req_rx_queues,
1053                                 sizeof(struct napi_struct), GFP_KERNEL);
1054         if (!adapter->napi)
1055                 return -ENOMEM;
1056
1057         for (i = 0; i < adapter->req_rx_queues; i++) {
1058                 netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
1059                 netif_napi_add(adapter->netdev, &adapter->napi[i],
1060                                ibmvnic_poll, NAPI_POLL_WEIGHT);
1061         }
1062
1063         adapter->num_active_rx_napi = adapter->req_rx_queues;
1064         return 0;
1065 }
1066
1067 static void release_napi(struct ibmvnic_adapter *adapter)
1068 {
1069         int i;
1070
1071         if (!adapter->napi)
1072                 return;
1073
1074         for (i = 0; i < adapter->num_active_rx_napi; i++) {
1075                 netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
1076                 netif_napi_del(&adapter->napi[i]);
1077         }
1078
1079         kfree(adapter->napi);
1080         adapter->napi = NULL;
1081         adapter->num_active_rx_napi = 0;
1082         adapter->napi_enabled = false;
1083 }
1084
1085 static const char *adapter_state_to_string(enum vnic_state state)
1086 {
1087         switch (state) {
1088         case VNIC_PROBING:
1089                 return "PROBING";
1090         case VNIC_PROBED:
1091                 return "PROBED";
1092         case VNIC_OPENING:
1093                 return "OPENING";
1094         case VNIC_OPEN:
1095                 return "OPEN";
1096         case VNIC_CLOSING:
1097                 return "CLOSING";
1098         case VNIC_CLOSED:
1099                 return "CLOSED";
1100         case VNIC_REMOVING:
1101                 return "REMOVING";
1102         case VNIC_REMOVED:
1103                 return "REMOVED";
1104         case VNIC_DOWN:
1105                 return "DOWN";
1106         }
1107         return "UNKNOWN";
1108 }
1109
1110 static int ibmvnic_login(struct net_device *netdev)
1111 {
1112         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1113         unsigned long timeout = msecs_to_jiffies(20000);
1114         int retry_count = 0;
1115         int retries = 10;
1116         bool retry;
1117         int rc;
1118
1119         do {
1120                 retry = false;
1121                 if (retry_count > retries) {
1122                         netdev_warn(netdev, "Login attempts exceeded\n");
1123                         return -EACCES;
1124                 }
1125
1126                 adapter->init_done_rc = 0;
1127                 reinit_completion(&adapter->init_done);
1128                 rc = send_login(adapter);
1129                 if (rc)
1130                         return rc;
1131
1132                 if (!wait_for_completion_timeout(&adapter->init_done,
1133                                                  timeout)) {
1134                         netdev_warn(netdev, "Login timed out, retrying...\n");
1135                         retry = true;
1136                         adapter->init_done_rc = 0;
1137                         retry_count++;
1138                         continue;
1139                 }
1140
1141                 if (adapter->init_done_rc == ABORTED) {
1142                         netdev_warn(netdev, "Login aborted, retrying...\n");
1143                         retry = true;
1144                         adapter->init_done_rc = 0;
1145                         retry_count++;
1146                         /* FW or device may be busy, so
1147                          * wait a bit before retrying login
1148                          */
1149                         msleep(500);
1150                 } else if (adapter->init_done_rc == PARTIALSUCCESS) {
1151                         retry_count++;
1152                         release_sub_crqs(adapter, 1);
1153
1154                         retry = true;
1155                         netdev_dbg(netdev,
1156                                    "Received partial success, retrying...\n");
1157                         adapter->init_done_rc = 0;
1158                         reinit_completion(&adapter->init_done);
1159                         send_query_cap(adapter);
1160                         if (!wait_for_completion_timeout(&adapter->init_done,
1161                                                          timeout)) {
1162                                 netdev_warn(netdev,
1163                                             "Capabilities query timed out\n");
1164                                 return -ETIMEDOUT;
1165                         }
1166
1167                         rc = init_sub_crqs(adapter);
1168                         if (rc) {
1169                                 netdev_warn(netdev,
1170                                             "SCRQ initialization failed\n");
1171                                 return rc;
1172                         }
1173
1174                         rc = init_sub_crq_irqs(adapter);
1175                         if (rc) {
1176                                 netdev_warn(netdev,
1177                                             "SCRQ irq initialization failed\n");
1178                                 return rc;
1179                         }
1180                 } else if (adapter->init_done_rc) {
1181                         netdev_warn(netdev, "Adapter login failed, init_done_rc = %d\n",
1182                                     adapter->init_done_rc);
1183                         return -EIO;
1184                 }
1185         } while (retry);
1186
1187         __ibmvnic_set_mac(netdev, adapter->mac_addr);
1188
1189         netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
1190         return 0;
1191 }
1192
1193 static void release_login_buffer(struct ibmvnic_adapter *adapter)
1194 {
1195         kfree(adapter->login_buf);
1196         adapter->login_buf = NULL;
1197 }
1198
1199 static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
1200 {
1201         kfree(adapter->login_rsp_buf);
1202         adapter->login_rsp_buf = NULL;
1203 }
1204
1205 static void release_resources(struct ibmvnic_adapter *adapter)
1206 {
1207         release_vpd_data(adapter);
1208
1209         release_napi(adapter);
1210         release_login_buffer(adapter);
1211         release_login_rsp_buffer(adapter);
1212 }
1213
1214 static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
1215 {
1216         struct net_device *netdev = adapter->netdev;
1217         unsigned long timeout = msecs_to_jiffies(20000);
1218         union ibmvnic_crq crq;
1219         bool resend;
1220         int rc;
1221
1222         netdev_dbg(netdev, "setting link state %d\n", link_state);
1223
1224         memset(&crq, 0, sizeof(crq));
1225         crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
1226         crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
1227         crq.logical_link_state.link_state = link_state;
1228
1229         do {
1230                 resend = false;
1231
1232                 reinit_completion(&adapter->init_done);
1233                 rc = ibmvnic_send_crq(adapter, &crq);
1234                 if (rc) {
1235                         netdev_err(netdev, "Failed to set link state\n");
1236                         return rc;
1237                 }
1238
1239                 if (!wait_for_completion_timeout(&adapter->init_done,
1240                                                  timeout)) {
1241                         netdev_err(netdev, "timeout setting link state\n");
1242                         return -ETIMEDOUT;
1243                 }
1244
1245                 if (adapter->init_done_rc == PARTIALSUCCESS) {
1246                         /* Partuial success, delay and re-send */
1247                         mdelay(1000);
1248                         resend = true;
1249                 } else if (adapter->init_done_rc) {
1250                         netdev_warn(netdev, "Unable to set link state, rc=%d\n",
1251                                     adapter->init_done_rc);
1252                         return adapter->init_done_rc;
1253                 }
1254         } while (resend);
1255
1256         return 0;
1257 }
1258
1259 static int set_real_num_queues(struct net_device *netdev)
1260 {
1261         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1262         int rc;
1263
1264         netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
1265                    adapter->req_tx_queues, adapter->req_rx_queues);
1266
1267         rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
1268         if (rc) {
1269                 netdev_err(netdev, "failed to set the number of tx queues\n");
1270                 return rc;
1271         }
1272
1273         rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
1274         if (rc)
1275                 netdev_err(netdev, "failed to set the number of rx queues\n");
1276
1277         return rc;
1278 }
1279
1280 static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
1281 {
1282         struct device *dev = &adapter->vdev->dev;
1283         union ibmvnic_crq crq;
1284         int len = 0;
1285         int rc;
1286
1287         if (adapter->vpd->buff)
1288                 len = adapter->vpd->len;
1289
1290         mutex_lock(&adapter->fw_lock);
1291         adapter->fw_done_rc = 0;
1292         reinit_completion(&adapter->fw_done);
1293
1294         crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
1295         crq.get_vpd_size.cmd = GET_VPD_SIZE;
1296         rc = ibmvnic_send_crq(adapter, &crq);
1297         if (rc) {
1298                 mutex_unlock(&adapter->fw_lock);
1299                 return rc;
1300         }
1301
1302         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
1303         if (rc) {
1304                 dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
1305                 mutex_unlock(&adapter->fw_lock);
1306                 return rc;
1307         }
1308         mutex_unlock(&adapter->fw_lock);
1309
1310         if (!adapter->vpd->len)
1311                 return -ENODATA;
1312
1313         if (!adapter->vpd->buff)
1314                 adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
1315         else if (adapter->vpd->len != len)
1316                 adapter->vpd->buff =
1317                         krealloc(adapter->vpd->buff,
1318                                  adapter->vpd->len, GFP_KERNEL);
1319
1320         if (!adapter->vpd->buff) {
1321                 dev_err(dev, "Could allocate VPD buffer\n");
1322                 return -ENOMEM;
1323         }
1324
1325         adapter->vpd->dma_addr =
1326                 dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
1327                                DMA_FROM_DEVICE);
1328         if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
1329                 dev_err(dev, "Could not map VPD buffer\n");
1330                 kfree(adapter->vpd->buff);
1331                 adapter->vpd->buff = NULL;
1332                 return -ENOMEM;
1333         }
1334
1335         mutex_lock(&adapter->fw_lock);
1336         adapter->fw_done_rc = 0;
1337         reinit_completion(&adapter->fw_done);
1338
1339         crq.get_vpd.first = IBMVNIC_CRQ_CMD;
1340         crq.get_vpd.cmd = GET_VPD;
1341         crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
1342         crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
1343         rc = ibmvnic_send_crq(adapter, &crq);
1344         if (rc) {
1345                 kfree(adapter->vpd->buff);
1346                 adapter->vpd->buff = NULL;
1347                 mutex_unlock(&adapter->fw_lock);
1348                 return rc;
1349         }
1350
1351         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
1352         if (rc) {
1353                 dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
1354                 kfree(adapter->vpd->buff);
1355                 adapter->vpd->buff = NULL;
1356                 mutex_unlock(&adapter->fw_lock);
1357                 return rc;
1358         }
1359
1360         mutex_unlock(&adapter->fw_lock);
1361         return 0;
1362 }
1363
1364 static int init_resources(struct ibmvnic_adapter *adapter)
1365 {
1366         struct net_device *netdev = adapter->netdev;
1367         int rc;
1368
1369         rc = set_real_num_queues(netdev);
1370         if (rc)
1371                 return rc;
1372
1373         adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
1374         if (!adapter->vpd)
1375                 return -ENOMEM;
1376
1377         /* Vital Product Data (VPD) */
1378         rc = ibmvnic_get_vpd(adapter);
1379         if (rc) {
1380                 netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
1381                 return rc;
1382         }
1383
1384         rc = init_napi(adapter);
1385         if (rc)
1386                 return rc;
1387
1388         send_query_map(adapter);
1389
1390         rc = init_rx_pools(netdev);
1391         if (rc)
1392                 return rc;
1393
1394         rc = init_tx_pools(netdev);
1395         return rc;
1396 }
1397
1398 static int __ibmvnic_open(struct net_device *netdev)
1399 {
1400         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1401         enum vnic_state prev_state = adapter->state;
1402         int i, rc;
1403
1404         adapter->state = VNIC_OPENING;
1405         replenish_pools(adapter);
1406         ibmvnic_napi_enable(adapter);
1407
1408         /* We're ready to receive frames, enable the sub-crq interrupts and
1409          * set the logical link state to up
1410          */
1411         for (i = 0; i < adapter->req_rx_queues; i++) {
1412                 netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
1413                 if (prev_state == VNIC_CLOSED)
1414                         enable_irq(adapter->rx_scrq[i]->irq);
1415                 enable_scrq_irq(adapter, adapter->rx_scrq[i]);
1416         }
1417
1418         for (i = 0; i < adapter->req_tx_queues; i++) {
1419                 netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
1420                 if (prev_state == VNIC_CLOSED)
1421                         enable_irq(adapter->tx_scrq[i]->irq);
1422                 enable_scrq_irq(adapter, adapter->tx_scrq[i]);
1423                 netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
1424         }
1425
1426         rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
1427         if (rc) {
1428                 ibmvnic_napi_disable(adapter);
1429                 ibmvnic_disable_irqs(adapter);
1430                 return rc;
1431         }
1432
1433         adapter->tx_queues_active = true;
1434
1435         /* Since queues were stopped until now, there shouldn't be any
1436          * one in ibmvnic_complete_tx() or ibmvnic_xmit() so maybe we
1437          * don't need the synchronize_rcu()? Leaving it for consistency
1438          * with setting ->tx_queues_active = false.
1439          */
1440         synchronize_rcu();
1441
1442         netif_tx_start_all_queues(netdev);
1443
1444         if (prev_state == VNIC_CLOSED) {
1445                 for (i = 0; i < adapter->req_rx_queues; i++)
1446                         napi_schedule(&adapter->napi[i]);
1447         }
1448
1449         adapter->state = VNIC_OPEN;
1450         return rc;
1451 }
1452
1453 static int ibmvnic_open(struct net_device *netdev)
1454 {
1455         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1456         int rc;
1457
1458         ASSERT_RTNL();
1459
1460         /* If device failover is pending or we are about to reset, just set
1461          * device state and return. Device operation will be handled by reset
1462          * routine.
1463          *
1464          * It should be safe to overwrite the adapter->state here. Since
1465          * we hold the rtnl, either the reset has not actually started or
1466          * the rtnl got dropped during the set_link_state() in do_reset().
1467          * In the former case, no one else is changing the state (again we
1468          * have the rtnl) and in the latter case, do_reset() will detect and
1469          * honor our setting below.
1470          */
1471         if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
1472                 netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
1473                            adapter_state_to_string(adapter->state),
1474                            adapter->failover_pending);
1475                 adapter->state = VNIC_OPEN;
1476                 rc = 0;
1477                 goto out;
1478         }
1479
1480         if (adapter->state != VNIC_CLOSED) {
1481                 rc = ibmvnic_login(netdev);
1482                 if (rc)
1483                         goto out;
1484
1485                 rc = init_resources(adapter);
1486                 if (rc) {
1487                         netdev_err(netdev, "failed to initialize resources\n");
1488                         goto out;
1489                 }
1490         }
1491
1492         rc = __ibmvnic_open(netdev);
1493
1494 out:
1495         /* If open failed and there is a pending failover or in-progress reset,
1496          * set device state and return. Device operation will be handled by
1497          * reset routine. See also comments above regarding rtnl.
1498          */
1499         if (rc &&
1500             (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
1501                 adapter->state = VNIC_OPEN;
1502                 rc = 0;
1503         }
1504
1505         if (rc) {
1506                 release_resources(adapter);
1507                 release_rx_pools(adapter);
1508                 release_tx_pools(adapter);
1509         }
1510
1511         return rc;
1512 }
1513
1514 static void clean_rx_pools(struct ibmvnic_adapter *adapter)
1515 {
1516         struct ibmvnic_rx_pool *rx_pool;
1517         struct ibmvnic_rx_buff *rx_buff;
1518         u64 rx_entries;
1519         int rx_scrqs;
1520         int i, j;
1521
1522         if (!adapter->rx_pool)
1523                 return;
1524
1525         rx_scrqs = adapter->num_active_rx_pools;
1526         rx_entries = adapter->req_rx_add_entries_per_subcrq;
1527
1528         /* Free any remaining skbs in the rx buffer pools */
1529         for (i = 0; i < rx_scrqs; i++) {
1530                 rx_pool = &adapter->rx_pool[i];
1531                 if (!rx_pool || !rx_pool->rx_buff)
1532                         continue;
1533
1534                 netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
1535                 for (j = 0; j < rx_entries; j++) {
1536                         rx_buff = &rx_pool->rx_buff[j];
1537                         if (rx_buff && rx_buff->skb) {
1538                                 dev_kfree_skb_any(rx_buff->skb);
1539                                 rx_buff->skb = NULL;
1540                         }
1541                 }
1542         }
1543 }
1544
1545 static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
1546                               struct ibmvnic_tx_pool *tx_pool)
1547 {
1548         struct ibmvnic_tx_buff *tx_buff;
1549         u64 tx_entries;
1550         int i;
1551
1552         if (!tx_pool || !tx_pool->tx_buff)
1553                 return;
1554
1555         tx_entries = tx_pool->num_buffers;
1556
1557         for (i = 0; i < tx_entries; i++) {
1558                 tx_buff = &tx_pool->tx_buff[i];
1559                 if (tx_buff && tx_buff->skb) {
1560                         dev_kfree_skb_any(tx_buff->skb);
1561                         tx_buff->skb = NULL;
1562                 }
1563         }
1564 }
1565
1566 static void clean_tx_pools(struct ibmvnic_adapter *adapter)
1567 {
1568         int tx_scrqs;
1569         int i;
1570
1571         if (!adapter->tx_pool || !adapter->tso_pool)
1572                 return;
1573
1574         tx_scrqs = adapter->num_active_tx_pools;
1575
1576         /* Free any remaining skbs in the tx buffer pools */
1577         for (i = 0; i < tx_scrqs; i++) {
1578                 netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
1579                 clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
1580                 clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
1581         }
1582 }
1583
1584 static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
1585 {
1586         struct net_device *netdev = adapter->netdev;
1587         int i;
1588
1589         if (adapter->tx_scrq) {
1590                 for (i = 0; i < adapter->req_tx_queues; i++)
1591                         if (adapter->tx_scrq[i]->irq) {
1592                                 netdev_dbg(netdev,
1593                                            "Disabling tx_scrq[%d] irq\n", i);
1594                                 disable_scrq_irq(adapter, adapter->tx_scrq[i]);
1595                                 disable_irq(adapter->tx_scrq[i]->irq);
1596                         }
1597         }
1598
1599         if (adapter->rx_scrq) {
1600                 for (i = 0; i < adapter->req_rx_queues; i++) {
1601                         if (adapter->rx_scrq[i]->irq) {
1602                                 netdev_dbg(netdev,
1603                                            "Disabling rx_scrq[%d] irq\n", i);
1604                                 disable_scrq_irq(adapter, adapter->rx_scrq[i]);
1605                                 disable_irq(adapter->rx_scrq[i]->irq);
1606                         }
1607                 }
1608         }
1609 }
1610
1611 static void ibmvnic_cleanup(struct net_device *netdev)
1612 {
1613         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1614
1615         /* ensure that transmissions are stopped if called by do_reset */
1616
1617         adapter->tx_queues_active = false;
1618
1619         /* Ensure complete_tx() and ibmvnic_xmit() see ->tx_queues_active
1620          * update so they don't restart a queue after we stop it below.
1621          */
1622         synchronize_rcu();
1623
1624         if (test_bit(0, &adapter->resetting))
1625                 netif_tx_disable(netdev);
1626         else
1627                 netif_tx_stop_all_queues(netdev);
1628
1629         ibmvnic_napi_disable(adapter);
1630         ibmvnic_disable_irqs(adapter);
1631 }
1632
1633 static int __ibmvnic_close(struct net_device *netdev)
1634 {
1635         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1636         int rc = 0;
1637
1638         adapter->state = VNIC_CLOSING;
1639         rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
1640         adapter->state = VNIC_CLOSED;
1641         return rc;
1642 }
1643
1644 static int ibmvnic_close(struct net_device *netdev)
1645 {
1646         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1647         int rc;
1648
1649         netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
1650                    adapter_state_to_string(adapter->state),
1651                    adapter->failover_pending,
1652                    adapter->force_reset_recovery);
1653
1654         /* If device failover is pending, just set device state and return.
1655          * Device operation will be handled by reset routine.
1656          */
1657         if (adapter->failover_pending) {
1658                 adapter->state = VNIC_CLOSED;
1659                 return 0;
1660         }
1661
1662         rc = __ibmvnic_close(netdev);
1663         ibmvnic_cleanup(netdev);
1664         clean_rx_pools(adapter);
1665         clean_tx_pools(adapter);
1666
1667         return rc;
1668 }
1669
1670 /**
1671  * build_hdr_data - creates L2/L3/L4 header data buffer
1672  * @hdr_field: bitfield determining needed headers
1673  * @skb: socket buffer
1674  * @hdr_len: array of header lengths
1675  * @hdr_data: buffer to write the header to
1676  *
1677  * Reads hdr_field to determine which headers are needed by firmware.
1678  * Builds a buffer containing these headers.  Saves individual header
1679  * lengths and total buffer length to be used to build descriptors.
1680  */
1681 static int build_hdr_data(u8 hdr_field, struct sk_buff *skb,
1682                           int *hdr_len, u8 *hdr_data)
1683 {
1684         int len = 0;
1685         u8 *hdr;
1686
1687         if (skb_vlan_tagged(skb) && !skb_vlan_tag_present(skb))
1688                 hdr_len[0] = sizeof(struct vlan_ethhdr);
1689         else
1690                 hdr_len[0] = sizeof(struct ethhdr);
1691
1692         if (skb->protocol == htons(ETH_P_IP)) {
1693                 hdr_len[1] = ip_hdr(skb)->ihl * 4;
1694                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
1695                         hdr_len[2] = tcp_hdrlen(skb);
1696                 else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
1697                         hdr_len[2] = sizeof(struct udphdr);
1698         } else if (skb->protocol == htons(ETH_P_IPV6)) {
1699                 hdr_len[1] = sizeof(struct ipv6hdr);
1700                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
1701                         hdr_len[2] = tcp_hdrlen(skb);
1702                 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
1703                         hdr_len[2] = sizeof(struct udphdr);
1704         } else if (skb->protocol == htons(ETH_P_ARP)) {
1705                 hdr_len[1] = arp_hdr_len(skb->dev);
1706                 hdr_len[2] = 0;
1707         }
1708
1709         memset(hdr_data, 0, 120);
1710         if ((hdr_field >> 6) & 1) {
1711                 hdr = skb_mac_header(skb);
1712                 memcpy(hdr_data, hdr, hdr_len[0]);
1713                 len += hdr_len[0];
1714         }
1715
1716         if ((hdr_field >> 5) & 1) {
1717                 hdr = skb_network_header(skb);
1718                 memcpy(hdr_data + len, hdr, hdr_len[1]);
1719                 len += hdr_len[1];
1720         }
1721
1722         if ((hdr_field >> 4) & 1) {
1723                 hdr = skb_transport_header(skb);
1724                 memcpy(hdr_data + len, hdr, hdr_len[2]);
1725                 len += hdr_len[2];
1726         }
1727         return len;
1728 }
1729
1730 /**
1731  * create_hdr_descs - create header and header extension descriptors
1732  * @hdr_field: bitfield determining needed headers
1733  * @hdr_data: buffer containing header data
1734  * @len: length of data buffer
1735  * @hdr_len: array of individual header lengths
1736  * @scrq_arr: descriptor array
1737  *
1738  * Creates header and, if needed, header extension descriptors and
1739  * places them in a descriptor array, scrq_arr
1740  */
1741
1742 static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
1743                             union sub_crq *scrq_arr)
1744 {
1745         union sub_crq hdr_desc;
1746         int tmp_len = len;
1747         int num_descs = 0;
1748         u8 *data, *cur;
1749         int tmp;
1750
1751         while (tmp_len > 0) {
1752                 cur = hdr_data + len - tmp_len;
1753
1754                 memset(&hdr_desc, 0, sizeof(hdr_desc));
1755                 if (cur != hdr_data) {
1756                         data = hdr_desc.hdr_ext.data;
1757                         tmp = tmp_len > 29 ? 29 : tmp_len;
1758                         hdr_desc.hdr_ext.first = IBMVNIC_CRQ_CMD;
1759                         hdr_desc.hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
1760                         hdr_desc.hdr_ext.len = tmp;
1761                 } else {
1762                         data = hdr_desc.hdr.data;
1763                         tmp = tmp_len > 24 ? 24 : tmp_len;
1764                         hdr_desc.hdr.first = IBMVNIC_CRQ_CMD;
1765                         hdr_desc.hdr.type = IBMVNIC_HDR_DESC;
1766                         hdr_desc.hdr.len = tmp;
1767                         hdr_desc.hdr.l2_len = (u8)hdr_len[0];
1768                         hdr_desc.hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
1769                         hdr_desc.hdr.l4_len = (u8)hdr_len[2];
1770                         hdr_desc.hdr.flag = hdr_field << 1;
1771                 }
1772                 memcpy(data, cur, tmp);
1773                 tmp_len -= tmp;
1774                 *scrq_arr = hdr_desc;
1775                 scrq_arr++;
1776                 num_descs++;
1777         }
1778
1779         return num_descs;
1780 }
1781
1782 /**
1783  * build_hdr_descs_arr - build a header descriptor array
1784  * @skb: tx socket buffer
1785  * @indir_arr: indirect array
1786  * @num_entries: number of descriptors to be sent
1787  * @hdr_field: bit field determining which headers will be sent
1788  *
1789  * This function will build a TX descriptor array with applicable
1790  * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
1791  */
1792
1793 static void build_hdr_descs_arr(struct sk_buff *skb,
1794                                 union sub_crq *indir_arr,
1795                                 int *num_entries, u8 hdr_field)
1796 {
1797         int hdr_len[3] = {0, 0, 0};
1798         u8 hdr_data[140] = {0};
1799         int tot_len;
1800
1801         tot_len = build_hdr_data(hdr_field, skb, hdr_len,
1802                                  hdr_data);
1803         *num_entries += create_hdr_descs(hdr_field, hdr_data, tot_len, hdr_len,
1804                                          indir_arr + 1);
1805 }
1806
1807 static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
1808                                     struct net_device *netdev)
1809 {
1810         /* For some backing devices, mishandling of small packets
1811          * can result in a loss of connection or TX stall. Device
1812          * architects recommend that no packet should be smaller
1813          * than the minimum MTU value provided to the driver, so
1814          * pad any packets to that length
1815          */
1816         if (skb->len < netdev->min_mtu)
1817                 return skb_put_padto(skb, netdev->min_mtu);
1818
1819         return 0;
1820 }
1821
1822 static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
1823                                          struct ibmvnic_sub_crq_queue *tx_scrq)
1824 {
1825         struct ibmvnic_ind_xmit_queue *ind_bufp;
1826         struct ibmvnic_tx_buff *tx_buff;
1827         struct ibmvnic_tx_pool *tx_pool;
1828         union sub_crq tx_scrq_entry;
1829         int queue_num;
1830         int entries;
1831         int index;
1832         int i;
1833
1834         ind_bufp = &tx_scrq->ind_buf;
1835         entries = (u64)ind_bufp->index;
1836         queue_num = tx_scrq->pool_index;
1837
1838         for (i = entries - 1; i >= 0; --i) {
1839                 tx_scrq_entry = ind_bufp->indir_arr[i];
1840                 if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
1841                         continue;
1842                 index = be32_to_cpu(tx_scrq_entry.v1.correlator);
1843                 if (index & IBMVNIC_TSO_POOL_MASK) {
1844                         tx_pool = &adapter->tso_pool[queue_num];
1845                         index &= ~IBMVNIC_TSO_POOL_MASK;
1846                 } else {
1847                         tx_pool = &adapter->tx_pool[queue_num];
1848                 }
1849                 tx_pool->free_map[tx_pool->consumer_index] = index;
1850                 tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
1851                                           tx_pool->num_buffers - 1 :
1852                                           tx_pool->consumer_index - 1;
1853                 tx_buff = &tx_pool->tx_buff[index];
1854                 adapter->netdev->stats.tx_packets--;
1855                 adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
1856                 adapter->tx_stats_buffers[queue_num].packets--;
1857                 adapter->tx_stats_buffers[queue_num].bytes -=
1858                                                 tx_buff->skb->len;
1859                 dev_kfree_skb_any(tx_buff->skb);
1860                 tx_buff->skb = NULL;
1861                 adapter->netdev->stats.tx_dropped++;
1862         }
1863
1864         ind_bufp->index = 0;
1865
1866         if (atomic_sub_return(entries, &tx_scrq->used) <=
1867             (adapter->req_tx_entries_per_subcrq / 2) &&
1868             __netif_subqueue_stopped(adapter->netdev, queue_num)) {
1869                 rcu_read_lock();
1870
1871                 if (adapter->tx_queues_active) {
1872                         netif_wake_subqueue(adapter->netdev, queue_num);
1873                         netdev_dbg(adapter->netdev, "Started queue %d\n",
1874                                    queue_num);
1875                 }
1876
1877                 rcu_read_unlock();
1878         }
1879 }
1880
1881 static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
1882                                  struct ibmvnic_sub_crq_queue *tx_scrq)
1883 {
1884         struct ibmvnic_ind_xmit_queue *ind_bufp;
1885         u64 dma_addr;
1886         u64 entries;
1887         u64 handle;
1888         int rc;
1889
1890         ind_bufp = &tx_scrq->ind_buf;
1891         dma_addr = (u64)ind_bufp->indir_dma;
1892         entries = (u64)ind_bufp->index;
1893         handle = tx_scrq->handle;
1894
1895         if (!entries)
1896                 return 0;
1897         rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
1898         if (rc)
1899                 ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
1900         else
1901                 ind_bufp->index = 0;
1902         return 0;
1903 }
1904
1905 static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
1906 {
1907         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1908         int queue_num = skb_get_queue_mapping(skb);
1909         u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
1910         struct device *dev = &adapter->vdev->dev;
1911         struct ibmvnic_ind_xmit_queue *ind_bufp;
1912         struct ibmvnic_tx_buff *tx_buff = NULL;
1913         struct ibmvnic_sub_crq_queue *tx_scrq;
1914         struct ibmvnic_tx_pool *tx_pool;
1915         unsigned int tx_send_failed = 0;
1916         netdev_tx_t ret = NETDEV_TX_OK;
1917         unsigned int tx_map_failed = 0;
1918         union sub_crq indir_arr[16];
1919         unsigned int tx_dropped = 0;
1920         unsigned int tx_packets = 0;
1921         unsigned int tx_bytes = 0;
1922         dma_addr_t data_dma_addr;
1923         struct netdev_queue *txq;
1924         unsigned long lpar_rc;
1925         union sub_crq tx_crq;
1926         unsigned int offset;
1927         int num_entries = 1;
1928         unsigned char *dst;
1929         int index = 0;
1930         u8 proto = 0;
1931
1932         /* If a reset is in progress, drop the packet since
1933          * the scrqs may get torn down. Otherwise use the
1934          * rcu to ensure reset waits for us to complete.
1935          */
1936         rcu_read_lock();
1937         if (!adapter->tx_queues_active) {
1938                 dev_kfree_skb_any(skb);
1939
1940                 tx_send_failed++;
1941                 tx_dropped++;
1942                 ret = NETDEV_TX_OK;
1943                 goto out;
1944         }
1945
1946         tx_scrq = adapter->tx_scrq[queue_num];
1947         txq = netdev_get_tx_queue(netdev, queue_num);
1948         ind_bufp = &tx_scrq->ind_buf;
1949
1950         if (ibmvnic_xmit_workarounds(skb, netdev)) {
1951                 tx_dropped++;
1952                 tx_send_failed++;
1953                 ret = NETDEV_TX_OK;
1954                 ibmvnic_tx_scrq_flush(adapter, tx_scrq);
1955                 goto out;
1956         }
1957
1958         if (skb_is_gso(skb))
1959                 tx_pool = &adapter->tso_pool[queue_num];
1960         else
1961                 tx_pool = &adapter->tx_pool[queue_num];
1962
1963         index = tx_pool->free_map[tx_pool->consumer_index];
1964
1965         if (index == IBMVNIC_INVALID_MAP) {
1966                 dev_kfree_skb_any(skb);
1967                 tx_send_failed++;
1968                 tx_dropped++;
1969                 ibmvnic_tx_scrq_flush(adapter, tx_scrq);
1970                 ret = NETDEV_TX_OK;
1971                 goto out;
1972         }
1973
1974         tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;
1975
1976         offset = index * tx_pool->buf_size;
1977         dst = tx_pool->long_term_buff.buff + offset;
1978         memset(dst, 0, tx_pool->buf_size);
1979         data_dma_addr = tx_pool->long_term_buff.addr + offset;
1980
1981         if (skb_shinfo(skb)->nr_frags) {
1982                 int cur, i;
1983
1984                 /* Copy the head */
1985                 skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
1986                 cur = skb_headlen(skb);
1987
1988                 /* Copy the frags */
1989                 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1990                         const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1991
1992                         memcpy(dst + cur, skb_frag_address(frag),
1993                                skb_frag_size(frag));
1994                         cur += skb_frag_size(frag);
1995                 }
1996         } else {
1997                 skb_copy_from_linear_data(skb, dst, skb->len);
1998         }
1999
2000         /* post changes to long_term_buff *dst before VIOS accessing it */
2001         dma_wmb();
2002
2003         tx_pool->consumer_index =
2004             (tx_pool->consumer_index + 1) % tx_pool->num_buffers;
2005
2006         tx_buff = &tx_pool->tx_buff[index];
2007         tx_buff->skb = skb;
2008         tx_buff->index = index;
2009         tx_buff->pool_index = queue_num;
2010
2011         memset(&tx_crq, 0, sizeof(tx_crq));
2012         tx_crq.v1.first = IBMVNIC_CRQ_CMD;
2013         tx_crq.v1.type = IBMVNIC_TX_DESC;
2014         tx_crq.v1.n_crq_elem = 1;
2015         tx_crq.v1.n_sge = 1;
2016         tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;
2017
2018         if (skb_is_gso(skb))
2019                 tx_crq.v1.correlator =
2020                         cpu_to_be32(index | IBMVNIC_TSO_POOL_MASK);
2021         else
2022                 tx_crq.v1.correlator = cpu_to_be32(index);
2023         tx_crq.v1.dma_reg = cpu_to_be16(tx_pool->long_term_buff.map_id);
2024         tx_crq.v1.sge_len = cpu_to_be32(skb->len);
2025         tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);
2026
2027         if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
2028                 tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
2029                 tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
2030         }
2031
2032         if (skb->protocol == htons(ETH_P_IP)) {
2033                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
2034                 proto = ip_hdr(skb)->protocol;
2035         } else if (skb->protocol == htons(ETH_P_IPV6)) {
2036                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
2037                 proto = ipv6_hdr(skb)->nexthdr;
2038         }
2039
2040         if (proto == IPPROTO_TCP)
2041                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
2042         else if (proto == IPPROTO_UDP)
2043                 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;
2044
2045         if (skb->ip_summed == CHECKSUM_PARTIAL) {
2046                 tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
2047                 hdrs += 2;
2048         }
2049         if (skb_is_gso(skb)) {
2050                 tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
2051                 tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
2052                 hdrs += 2;
2053         }
2054
2055         if ((*hdrs >> 7) & 1)
2056                 build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
2057
2058         tx_crq.v1.n_crq_elem = num_entries;
2059         tx_buff->num_entries = num_entries;
2060         /* flush buffer if current entry can not fit */
2061         if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
2062                 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
2063                 if (lpar_rc != H_SUCCESS)
2064                         goto tx_flush_err;
2065         }
2066
2067         indir_arr[0] = tx_crq;
2068         memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
2069                num_entries * sizeof(struct ibmvnic_generic_scrq));
2070         ind_bufp->index += num_entries;
2071         if (__netdev_tx_sent_queue(txq, skb->len,
2072                                    netdev_xmit_more() &&
2073                                    ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
2074                 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq);
2075                 if (lpar_rc != H_SUCCESS)
2076                         goto tx_err;
2077         }
2078
2079         if (atomic_add_return(num_entries, &tx_scrq->used)
2080                                         >= adapter->req_tx_entries_per_subcrq) {
2081                 netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
2082                 netif_stop_subqueue(netdev, queue_num);
2083         }
2084
2085         tx_packets++;
2086         tx_bytes += skb->len;
2087         txq_trans_cond_update(txq);
2088         ret = NETDEV_TX_OK;
2089         goto out;
2090
2091 tx_flush_err:
2092         dev_kfree_skb_any(skb);
2093         tx_buff->skb = NULL;
2094         tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
2095                                   tx_pool->num_buffers - 1 :
2096                                   tx_pool->consumer_index - 1;
2097         tx_dropped++;
2098 tx_err:
2099         if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
2100                 dev_err_ratelimited(dev, "tx: send failed\n");
2101
2102         if (lpar_rc == H_CLOSED || adapter->failover_pending) {
2103                 /* Disable TX and report carrier off if queue is closed
2104                  * or pending failover.
2105                  * Firmware guarantees that a signal will be sent to the
2106                  * driver, triggering a reset or some other action.
2107                  */
2108                 netif_tx_stop_all_queues(netdev);
2109                 netif_carrier_off(netdev);
2110         }
2111 out:
2112         rcu_read_unlock();
2113         netdev->stats.tx_dropped += tx_dropped;
2114         netdev->stats.tx_bytes += tx_bytes;
2115         netdev->stats.tx_packets += tx_packets;
2116         adapter->tx_send_failed += tx_send_failed;
2117         adapter->tx_map_failed += tx_map_failed;
2118         adapter->tx_stats_buffers[queue_num].packets += tx_packets;
2119         adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
2120         adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;
2121
2122         return ret;
2123 }
2124
2125 static void ibmvnic_set_multi(struct net_device *netdev)
2126 {
2127         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2128         struct netdev_hw_addr *ha;
2129         union ibmvnic_crq crq;
2130
2131         memset(&crq, 0, sizeof(crq));
2132         crq.request_capability.first = IBMVNIC_CRQ_CMD;
2133         crq.request_capability.cmd = REQUEST_CAPABILITY;
2134
2135         if (netdev->flags & IFF_PROMISC) {
2136                 if (!adapter->promisc_supported)
2137                         return;
2138         } else {
2139                 if (netdev->flags & IFF_ALLMULTI) {
2140                         /* Accept all multicast */
2141                         memset(&crq, 0, sizeof(crq));
2142                         crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
2143                         crq.multicast_ctrl.cmd = MULTICAST_CTRL;
2144                         crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
2145                         ibmvnic_send_crq(adapter, &crq);
2146                 } else if (netdev_mc_empty(netdev)) {
2147                         /* Reject all multicast */
2148                         memset(&crq, 0, sizeof(crq));
2149                         crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
2150                         crq.multicast_ctrl.cmd = MULTICAST_CTRL;
2151                         crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
2152                         ibmvnic_send_crq(adapter, &crq);
2153                 } else {
2154                         /* Accept one or more multicast(s) */
2155                         netdev_for_each_mc_addr(ha, netdev) {
2156                                 memset(&crq, 0, sizeof(crq));
2157                                 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
2158                                 crq.multicast_ctrl.cmd = MULTICAST_CTRL;
2159                                 crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
2160                                 ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
2161                                                 ha->addr);
2162                                 ibmvnic_send_crq(adapter, &crq);
2163                         }
2164                 }
2165         }
2166 }
2167
2168 static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
2169 {
2170         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2171         union ibmvnic_crq crq;
2172         int rc;
2173
2174         if (!is_valid_ether_addr(dev_addr)) {
2175                 rc = -EADDRNOTAVAIL;
2176                 goto err;
2177         }
2178
2179         memset(&crq, 0, sizeof(crq));
2180         crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
2181         crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
2182         ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);
2183
2184         mutex_lock(&adapter->fw_lock);
2185         adapter->fw_done_rc = 0;
2186         reinit_completion(&adapter->fw_done);
2187
2188         rc = ibmvnic_send_crq(adapter, &crq);
2189         if (rc) {
2190                 rc = -EIO;
2191                 mutex_unlock(&adapter->fw_lock);
2192                 goto err;
2193         }
2194
2195         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
2196         /* netdev->dev_addr is changed in handle_change_mac_rsp function */
2197         if (rc || adapter->fw_done_rc) {
2198                 rc = -EIO;
2199                 mutex_unlock(&adapter->fw_lock);
2200                 goto err;
2201         }
2202         mutex_unlock(&adapter->fw_lock);
2203         return 0;
2204 err:
2205         ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
2206         return rc;
2207 }
2208
2209 static int ibmvnic_set_mac(struct net_device *netdev, void *p)
2210 {
2211         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2212         struct sockaddr *addr = p;
2213         int rc;
2214
2215         rc = 0;
2216         if (!is_valid_ether_addr(addr->sa_data))
2217                 return -EADDRNOTAVAIL;
2218
2219         ether_addr_copy(adapter->mac_addr, addr->sa_data);
2220         if (adapter->state != VNIC_PROBED)
2221                 rc = __ibmvnic_set_mac(netdev, addr->sa_data);
2222
2223         return rc;
2224 }
2225
2226 static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
2227 {
2228         switch (reason) {
2229         case VNIC_RESET_FAILOVER:
2230                 return "FAILOVER";
2231         case VNIC_RESET_MOBILITY:
2232                 return "MOBILITY";
2233         case VNIC_RESET_FATAL:
2234                 return "FATAL";
2235         case VNIC_RESET_NON_FATAL:
2236                 return "NON_FATAL";
2237         case VNIC_RESET_TIMEOUT:
2238                 return "TIMEOUT";
2239         case VNIC_RESET_CHANGE_PARAM:
2240                 return "CHANGE_PARAM";
2241         case VNIC_RESET_PASSIVE_INIT:
2242                 return "PASSIVE_INIT";
2243         }
2244         return "UNKNOWN";
2245 }
2246
2247 /*
2248  * Initialize the init_done completion and return code values. We
2249  * can get a transport event just after registering the CRQ and the
2250  * tasklet will use this to communicate the transport event. To ensure
2251  * we don't miss the notification/error, initialize these _before_
2252  * regisering the CRQ.
2253  */
2254 static inline void reinit_init_done(struct ibmvnic_adapter *adapter)
2255 {
2256         reinit_completion(&adapter->init_done);
2257         adapter->init_done_rc = 0;
2258 }
2259
2260 /*
2261  * do_reset returns zero if we are able to keep processing reset events, or
2262  * non-zero if we hit a fatal error and must halt.
2263  */
2264 static int do_reset(struct ibmvnic_adapter *adapter,
2265                     struct ibmvnic_rwi *rwi, u32 reset_state)
2266 {
2267         struct net_device *netdev = adapter->netdev;
2268         u64 old_num_rx_queues, old_num_tx_queues;
2269         u64 old_num_rx_slots, old_num_tx_slots;
2270         int rc;
2271
2272         netdev_dbg(adapter->netdev,
2273                    "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
2274                    adapter_state_to_string(adapter->state),
2275                    adapter->failover_pending,
2276                    reset_reason_to_string(rwi->reset_reason),
2277                    adapter_state_to_string(reset_state));
2278
2279         adapter->reset_reason = rwi->reset_reason;
2280         /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
2281         if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
2282                 rtnl_lock();
2283
2284         /* Now that we have the rtnl lock, clear any pending failover.
2285          * This will ensure ibmvnic_open() has either completed or will
2286          * block until failover is complete.
2287          */
2288         if (rwi->reset_reason == VNIC_RESET_FAILOVER)
2289                 adapter->failover_pending = false;
2290
2291         /* read the state and check (again) after getting rtnl */
2292         reset_state = adapter->state;
2293
2294         if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
2295                 rc = -EBUSY;
2296                 goto out;
2297         }
2298
2299         netif_carrier_off(netdev);
2300
2301         old_num_rx_queues = adapter->req_rx_queues;
2302         old_num_tx_queues = adapter->req_tx_queues;
2303         old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
2304         old_num_tx_slots = adapter->req_tx_entries_per_subcrq;
2305
2306         ibmvnic_cleanup(netdev);
2307
2308         if (reset_state == VNIC_OPEN &&
2309             adapter->reset_reason != VNIC_RESET_MOBILITY &&
2310             adapter->reset_reason != VNIC_RESET_FAILOVER) {
2311                 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2312                         rc = __ibmvnic_close(netdev);
2313                         if (rc)
2314                                 goto out;
2315                 } else {
2316                         adapter->state = VNIC_CLOSING;
2317
2318                         /* Release the RTNL lock before link state change and
2319                          * re-acquire after the link state change to allow
2320                          * linkwatch_event to grab the RTNL lock and run during
2321                          * a reset.
2322                          */
2323                         rtnl_unlock();
2324                         rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
2325                         rtnl_lock();
2326                         if (rc)
2327                                 goto out;
2328
2329                         if (adapter->state == VNIC_OPEN) {
2330                                 /* When we dropped rtnl, ibmvnic_open() got
2331                                  * it and noticed that we are resetting and
2332                                  * set the adapter state to OPEN. Update our
2333                                  * new "target" state, and resume the reset
2334                                  * from VNIC_CLOSING state.
2335                                  */
2336                                 netdev_dbg(netdev,
2337                                            "Open changed state from %s, updating.\n",
2338                                            adapter_state_to_string(reset_state));
2339                                 reset_state = VNIC_OPEN;
2340                                 adapter->state = VNIC_CLOSING;
2341                         }
2342
2343                         if (adapter->state != VNIC_CLOSING) {
2344                                 /* If someone else changed the adapter state
2345                                  * when we dropped the rtnl, fail the reset
2346                                  */
2347                                 rc = -EAGAIN;
2348                                 goto out;
2349                         }
2350                         adapter->state = VNIC_CLOSED;
2351                 }
2352         }
2353
2354         if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2355                 release_resources(adapter);
2356                 release_sub_crqs(adapter, 1);
2357                 release_crq_queue(adapter);
2358         }
2359
2360         if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
2361                 /* remove the closed state so when we call open it appears
2362                  * we are coming from the probed state.
2363                  */
2364                 adapter->state = VNIC_PROBED;
2365
2366                 reinit_init_done(adapter);
2367
2368                 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2369                         rc = init_crq_queue(adapter);
2370                 } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
2371                         rc = ibmvnic_reenable_crq_queue(adapter);
2372                         release_sub_crqs(adapter, 1);
2373                 } else {
2374                         rc = ibmvnic_reset_crq(adapter);
2375                         if (rc == H_CLOSED || rc == H_SUCCESS) {
2376                                 rc = vio_enable_interrupts(adapter->vdev);
2377                                 if (rc)
2378                                         netdev_err(adapter->netdev,
2379                                                    "Reset failed to enable interrupts. rc=%d\n",
2380                                                    rc);
2381                         }
2382                 }
2383
2384                 if (rc) {
2385                         netdev_err(adapter->netdev,
2386                                    "Reset couldn't initialize crq. rc=%d\n", rc);
2387                         goto out;
2388                 }
2389
2390                 rc = ibmvnic_reset_init(adapter, true);
2391                 if (rc)
2392                         goto out;
2393
2394                 /* If the adapter was in PROBE or DOWN state prior to the reset,
2395                  * exit here.
2396                  */
2397                 if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) {
2398                         rc = 0;
2399                         goto out;
2400                 }
2401
2402                 rc = ibmvnic_login(netdev);
2403                 if (rc)
2404                         goto out;
2405
2406                 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2407                         rc = init_resources(adapter);
2408                         if (rc)
2409                                 goto out;
2410                 } else if (adapter->req_rx_queues != old_num_rx_queues ||
2411                     adapter->req_tx_queues != old_num_tx_queues ||
2412                     adapter->req_rx_add_entries_per_subcrq !=
2413                     old_num_rx_slots ||
2414                     adapter->req_tx_entries_per_subcrq !=
2415                     old_num_tx_slots ||
2416                     !adapter->rx_pool ||
2417                     !adapter->tso_pool ||
2418                     !adapter->tx_pool) {
2419                         release_napi(adapter);
2420                         release_vpd_data(adapter);
2421
2422                         rc = init_resources(adapter);
2423                         if (rc)
2424                                 goto out;
2425
2426                 } else {
2427                         rc = init_tx_pools(netdev);
2428                         if (rc) {
2429                                 netdev_dbg(netdev,
2430                                            "init tx pools failed (%d)\n",
2431                                            rc);
2432                                 goto out;
2433                         }
2434
2435                         rc = init_rx_pools(netdev);
2436                         if (rc) {
2437                                 netdev_dbg(netdev,
2438                                            "init rx pools failed (%d)\n",
2439                                            rc);
2440                                 goto out;
2441                         }
2442                 }
2443                 ibmvnic_disable_irqs(adapter);
2444         }
2445         adapter->state = VNIC_CLOSED;
2446
2447         if (reset_state == VNIC_CLOSED) {
2448                 rc = 0;
2449                 goto out;
2450         }
2451
2452         rc = __ibmvnic_open(netdev);
2453         if (rc) {
2454                 rc = IBMVNIC_OPEN_FAILED;
2455                 goto out;
2456         }
2457
2458         /* refresh device's multicast list */
2459         ibmvnic_set_multi(netdev);
2460
2461         if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
2462             adapter->reset_reason == VNIC_RESET_MOBILITY)
2463                 __netdev_notify_peers(netdev);
2464
2465         rc = 0;
2466
2467 out:
2468         /* restore the adapter state if reset failed */
2469         if (rc)
2470                 adapter->state = reset_state;
2471         /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
2472         if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
2473                 rtnl_unlock();
2474
2475         netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
2476                    adapter_state_to_string(adapter->state),
2477                    adapter->failover_pending, rc);
2478         return rc;
2479 }
2480
2481 static int do_hard_reset(struct ibmvnic_adapter *adapter,
2482                          struct ibmvnic_rwi *rwi, u32 reset_state)
2483 {
2484         struct net_device *netdev = adapter->netdev;
2485         int rc;
2486
2487         netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
2488                    reset_reason_to_string(rwi->reset_reason));
2489
2490         /* read the state and check (again) after getting rtnl */
2491         reset_state = adapter->state;
2492
2493         if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
2494                 rc = -EBUSY;
2495                 goto out;
2496         }
2497
2498         netif_carrier_off(netdev);
2499         adapter->reset_reason = rwi->reset_reason;
2500
2501         ibmvnic_cleanup(netdev);
2502         release_resources(adapter);
2503         release_sub_crqs(adapter, 0);
2504         release_crq_queue(adapter);
2505
2506         /* remove the closed state so when we call open it appears
2507          * we are coming from the probed state.
2508          */
2509         adapter->state = VNIC_PROBED;
2510
2511         reinit_init_done(adapter);
2512
2513         rc = init_crq_queue(adapter);
2514         if (rc) {
2515                 netdev_err(adapter->netdev,
2516                            "Couldn't initialize crq. rc=%d\n", rc);
2517                 goto out;
2518         }
2519
2520         rc = ibmvnic_reset_init(adapter, false);
2521         if (rc)
2522                 goto out;
2523
2524         /* If the adapter was in PROBE or DOWN state prior to the reset,
2525          * exit here.
2526          */
2527         if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN)
2528                 goto out;
2529
2530         rc = ibmvnic_login(netdev);
2531         if (rc)
2532                 goto out;
2533
2534         rc = init_resources(adapter);
2535         if (rc)
2536                 goto out;
2537
2538         ibmvnic_disable_irqs(adapter);
2539         adapter->state = VNIC_CLOSED;
2540
2541         if (reset_state == VNIC_CLOSED)
2542                 goto out;
2543
2544         rc = __ibmvnic_open(netdev);
2545         if (rc) {
2546                 rc = IBMVNIC_OPEN_FAILED;
2547                 goto out;
2548         }
2549
2550         __netdev_notify_peers(netdev);
2551 out:
2552         /* restore adapter state if reset failed */
2553         if (rc)
2554                 adapter->state = reset_state;
2555         netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
2556                    adapter_state_to_string(adapter->state),
2557                    adapter->failover_pending, rc);
2558         return rc;
2559 }
2560
2561 static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
2562 {
2563         struct ibmvnic_rwi *rwi;
2564         unsigned long flags;
2565
2566         spin_lock_irqsave(&adapter->rwi_lock, flags);
2567
2568         if (!list_empty(&adapter->rwi_list)) {
2569                 rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
2570                                        list);
2571                 list_del(&rwi->list);
2572         } else {
2573                 rwi = NULL;
2574         }
2575
2576         spin_unlock_irqrestore(&adapter->rwi_lock, flags);
2577         return rwi;
2578 }
2579
2580 /**
2581  * do_passive_init - complete probing when partner device is detected.
2582  * @adapter: ibmvnic_adapter struct
2583  *
2584  * If the ibmvnic device does not have a partner device to communicate with at boot
2585  * and that partner device comes online at a later time, this function is called
2586  * to complete the initialization process of ibmvnic device.
2587  * Caller is expected to hold rtnl_lock().
2588  *
2589  * Returns non-zero if sub-CRQs are not initialized properly leaving the device
2590  * in the down state.
2591  * Returns 0 upon success and the device is in PROBED state.
2592  */
2593
2594 static int do_passive_init(struct ibmvnic_adapter *adapter)
2595 {
2596         unsigned long timeout = msecs_to_jiffies(30000);
2597         struct net_device *netdev = adapter->netdev;
2598         struct device *dev = &adapter->vdev->dev;
2599         int rc;
2600
2601         netdev_dbg(netdev, "Partner device found, probing.\n");
2602
2603         adapter->state = VNIC_PROBING;
2604         reinit_completion(&adapter->init_done);
2605         adapter->init_done_rc = 0;
2606         adapter->crq.active = true;
2607
2608         rc = send_crq_init_complete(adapter);
2609         if (rc)
2610                 goto out;
2611
2612         rc = send_version_xchg(adapter);
2613         if (rc)
2614                 netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc);
2615
2616         if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
2617                 dev_err(dev, "Initialization sequence timed out\n");
2618                 rc = -ETIMEDOUT;
2619                 goto out;
2620         }
2621
2622         rc = init_sub_crqs(adapter);
2623         if (rc) {
2624                 dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc);
2625                 goto out;
2626         }
2627
2628         rc = init_sub_crq_irqs(adapter);
2629         if (rc) {
2630                 dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc);
2631                 goto init_failed;
2632         }
2633
2634         netdev->mtu = adapter->req_mtu - ETH_HLEN;
2635         netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
2636         netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
2637
2638         adapter->state = VNIC_PROBED;
2639         netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n");
2640
2641         return 0;
2642
2643 init_failed:
2644         release_sub_crqs(adapter, 1);
2645 out:
2646         adapter->state = VNIC_DOWN;
2647         return rc;
2648 }
2649
2650 static void __ibmvnic_reset(struct work_struct *work)
2651 {
2652         struct ibmvnic_adapter *adapter;
2653         unsigned int timeout = 5000;
2654         struct ibmvnic_rwi *tmprwi;
2655         bool saved_state = false;
2656         struct ibmvnic_rwi *rwi;
2657         unsigned long flags;
2658         struct device *dev;
2659         bool need_reset;
2660         int num_fails = 0;
2661         u32 reset_state;
2662         int rc = 0;
2663
2664         adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
2665                 dev = &adapter->vdev->dev;
2666
2667         /* Wait for ibmvnic_probe() to complete. If probe is taking too long
2668          * or if another reset is in progress, defer work for now. If probe
2669          * eventually fails it will flush and terminate our work.
2670          *
2671          * Three possibilities here:
2672          * 1. Adpater being removed  - just return
2673          * 2. Timed out on probe or another reset in progress - delay the work
2674          * 3. Completed probe - perform any resets in queue
2675          */
2676         if (adapter->state == VNIC_PROBING &&
2677             !wait_for_completion_timeout(&adapter->probe_done, timeout)) {
2678                 dev_err(dev, "Reset thread timed out on probe");
2679                 queue_delayed_work(system_long_wq,
2680                                    &adapter->ibmvnic_delayed_reset,
2681                                    IBMVNIC_RESET_DELAY);
2682                 return;
2683         }
2684
2685         /* adapter is done with probe (i.e state is never VNIC_PROBING now) */
2686         if (adapter->state == VNIC_REMOVING)
2687                 return;
2688
2689         /* ->rwi_list is stable now (no one else is removing entries) */
2690
2691         /* ibmvnic_probe() may have purged the reset queue after we were
2692          * scheduled to process a reset so there maybe no resets to process.
2693          * Before setting the ->resetting bit though, we have to make sure
2694          * that there is infact a reset to process. Otherwise we may race
2695          * with ibmvnic_open() and end up leaving the vnic down:
2696          *
2697          *      __ibmvnic_reset()           ibmvnic_open()
2698          *      -----------------           --------------
2699          *
2700          *  set ->resetting bit
2701          *                              find ->resetting bit is set
2702          *                              set ->state to IBMVNIC_OPEN (i.e
2703          *                              assume reset will open device)
2704          *                              return
2705          *  find reset queue empty
2706          *  return
2707          *
2708          *      Neither performed vnic login/open and vnic stays down
2709          *
2710          * If we hold the lock and conditionally set the bit, either we
2711          * or ibmvnic_open() will complete the open.
2712          */
2713         need_reset = false;
2714         spin_lock(&adapter->rwi_lock);
2715         if (!list_empty(&adapter->rwi_list)) {
2716                 if (test_and_set_bit_lock(0, &adapter->resetting)) {
2717                         queue_delayed_work(system_long_wq,
2718                                            &adapter->ibmvnic_delayed_reset,
2719                                            IBMVNIC_RESET_DELAY);
2720                 } else {
2721                         need_reset = true;
2722                 }
2723         }
2724         spin_unlock(&adapter->rwi_lock);
2725
2726         if (!need_reset)
2727                 return;
2728
2729         rwi = get_next_rwi(adapter);
2730         while (rwi) {
2731                 spin_lock_irqsave(&adapter->state_lock, flags);
2732
2733                 if (adapter->state == VNIC_REMOVING ||
2734                     adapter->state == VNIC_REMOVED) {
2735                         spin_unlock_irqrestore(&adapter->state_lock, flags);
2736                         kfree(rwi);
2737                         rc = EBUSY;
2738                         break;
2739                 }
2740
2741                 if (!saved_state) {
2742                         reset_state = adapter->state;
2743                         saved_state = true;
2744                 }
2745                 spin_unlock_irqrestore(&adapter->state_lock, flags);
2746
2747                 if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) {
2748                         rtnl_lock();
2749                         rc = do_passive_init(adapter);
2750                         rtnl_unlock();
2751                         if (!rc)
2752                                 netif_carrier_on(adapter->netdev);
2753                 } else if (adapter->force_reset_recovery) {
2754                         /* Since we are doing a hard reset now, clear the
2755                          * failover_pending flag so we don't ignore any
2756                          * future MOBILITY or other resets.
2757                          */
2758                         adapter->failover_pending = false;
2759
2760                         /* Transport event occurred during previous reset */
2761                         if (adapter->wait_for_reset) {
2762                                 /* Previous was CHANGE_PARAM; caller locked */
2763                                 adapter->force_reset_recovery = false;
2764                                 rc = do_hard_reset(adapter, rwi, reset_state);
2765                         } else {
2766                                 rtnl_lock();
2767                                 adapter->force_reset_recovery = false;
2768                                 rc = do_hard_reset(adapter, rwi, reset_state);
2769                                 rtnl_unlock();
2770                         }
2771                         if (rc)
2772                                 num_fails++;
2773                         else
2774                                 num_fails = 0;
2775
2776                         /* If auto-priority-failover is enabled we can get
2777                          * back to back failovers during resets, resulting
2778                          * in at least two failed resets (from high-priority
2779                          * backing device to low-priority one and then back)
2780                          * If resets continue to fail beyond that, give the
2781                          * adapter some time to settle down before retrying.
2782                          */
2783                         if (num_fails >= 3) {
2784                                 netdev_dbg(adapter->netdev,
2785                                            "[S:%s] Hard reset failed %d times, waiting 60 secs\n",
2786                                            adapter_state_to_string(adapter->state),
2787                                            num_fails);
2788                                 set_current_state(TASK_UNINTERRUPTIBLE);
2789                                 schedule_timeout(60 * HZ);
2790                         }
2791                 } else {
2792                         rc = do_reset(adapter, rwi, reset_state);
2793                 }
2794                 tmprwi = rwi;
2795                 adapter->last_reset_time = jiffies;
2796
2797                 if (rc)
2798                         netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);
2799
2800                 rwi = get_next_rwi(adapter);
2801
2802                 /*
2803                  * If there is another reset queued, free the previous rwi
2804                  * and process the new reset even if previous reset failed
2805                  * (the previous reset could have failed because of a fail
2806                  * over for instance, so process the fail over).
2807                  *
2808                  * If there are no resets queued and the previous reset failed,
2809                  * the adapter would be in an undefined state. So retry the
2810                  * previous reset as a hard reset.
2811                  */
2812                 if (rwi)
2813                         kfree(tmprwi);
2814                 else if (rc)
2815                         rwi = tmprwi;
2816
2817                 if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
2818                             rwi->reset_reason == VNIC_RESET_MOBILITY || rc))
2819                         adapter->force_reset_recovery = true;
2820         }
2821
2822         if (adapter->wait_for_reset) {
2823                 adapter->reset_done_rc = rc;
2824                 complete(&adapter->reset_done);
2825         }
2826
2827         clear_bit_unlock(0, &adapter->resetting);
2828
2829         netdev_dbg(adapter->netdev,
2830                    "[S:%s FRR:%d WFR:%d] Done processing resets\n",
2831                    adapter_state_to_string(adapter->state),
2832                    adapter->force_reset_recovery,
2833                    adapter->wait_for_reset);
2834 }
2835
2836 static void __ibmvnic_delayed_reset(struct work_struct *work)
2837 {
2838         struct ibmvnic_adapter *adapter;
2839
2840         adapter = container_of(work, struct ibmvnic_adapter,
2841                                ibmvnic_delayed_reset.work);
2842         __ibmvnic_reset(&adapter->ibmvnic_reset);
2843 }
2844
2845 static void flush_reset_queue(struct ibmvnic_adapter *adapter)
2846 {
2847         struct list_head *entry, *tmp_entry;
2848
2849         if (!list_empty(&adapter->rwi_list)) {
2850                 list_for_each_safe(entry, tmp_entry, &adapter->rwi_list) {
2851                         list_del(entry);
2852                         kfree(list_entry(entry, struct ibmvnic_rwi, list));
2853                 }
2854         }
2855 }
2856
2857 static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
2858                          enum ibmvnic_reset_reason reason)
2859 {
2860         struct net_device *netdev = adapter->netdev;
2861         struct ibmvnic_rwi *rwi, *tmp;
2862         unsigned long flags;
2863         int ret;
2864
2865         spin_lock_irqsave(&adapter->rwi_lock, flags);
2866
2867         /* If failover is pending don't schedule any other reset.
2868          * Instead let the failover complete. If there is already a
2869          * a failover reset scheduled, we will detect and drop the
2870          * duplicate reset when walking the ->rwi_list below.
2871          */
2872         if (adapter->state == VNIC_REMOVING ||
2873             adapter->state == VNIC_REMOVED ||
2874             (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
2875                 ret = EBUSY;
2876                 netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
2877                 goto err;
2878         }
2879
2880         list_for_each_entry(tmp, &adapter->rwi_list, list) {
2881                 if (tmp->reset_reason == reason) {
2882                         netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
2883                                    reset_reason_to_string(reason));
2884                         ret = EBUSY;
2885                         goto err;
2886                 }
2887         }
2888
2889         rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
2890         if (!rwi) {
2891                 ret = ENOMEM;
2892                 goto err;
2893         }
2894         /* if we just received a transport event,
2895          * flush reset queue and process this reset
2896          */
2897         if (adapter->force_reset_recovery)
2898                 flush_reset_queue(adapter);
2899
2900         rwi->reset_reason = reason;
2901         list_add_tail(&rwi->list, &adapter->rwi_list);
2902         netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
2903                    reset_reason_to_string(reason));
2904         queue_work(system_long_wq, &adapter->ibmvnic_reset);
2905
2906         ret = 0;
2907 err:
2908         /* ibmvnic_close() below can block, so drop the lock first */
2909         spin_unlock_irqrestore(&adapter->rwi_lock, flags);
2910
2911         if (ret == ENOMEM)
2912                 ibmvnic_close(netdev);
2913
2914         return -ret;
2915 }
2916
2917 static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
2918 {
2919         struct ibmvnic_adapter *adapter = netdev_priv(dev);
2920
2921         if (test_bit(0, &adapter->resetting)) {
2922                 netdev_err(adapter->netdev,
2923                            "Adapter is resetting, skip timeout reset\n");
2924                 return;
2925         }
2926         /* No queuing up reset until at least 5 seconds (default watchdog val)
2927          * after last reset
2928          */
2929         if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
2930                 netdev_dbg(dev, "Not yet time to tx timeout.\n");
2931                 return;
2932         }
2933         ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
2934 }
2935
2936 static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
2937                                   struct ibmvnic_rx_buff *rx_buff)
2938 {
2939         struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];
2940
2941         rx_buff->skb = NULL;
2942
2943         pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
2944         pool->next_alloc = (pool->next_alloc + 1) % pool->size;
2945
2946         atomic_dec(&pool->available);
2947 }
2948
2949 static int ibmvnic_poll(struct napi_struct *napi, int budget)
2950 {
2951         struct ibmvnic_sub_crq_queue *rx_scrq;
2952         struct ibmvnic_adapter *adapter;
2953         struct net_device *netdev;
2954         int frames_processed;
2955         int scrq_num;
2956
2957         netdev = napi->dev;
2958         adapter = netdev_priv(netdev);
2959         scrq_num = (int)(napi - adapter->napi);
2960         frames_processed = 0;
2961         rx_scrq = adapter->rx_scrq[scrq_num];
2962
2963 restart_poll:
2964         while (frames_processed < budget) {
2965                 struct sk_buff *skb;
2966                 struct ibmvnic_rx_buff *rx_buff;
2967                 union sub_crq *next;
2968                 u32 length;
2969                 u16 offset;
2970                 u8 flags = 0;
2971
2972                 if (unlikely(test_bit(0, &adapter->resetting) &&
2973                              adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
2974                         enable_scrq_irq(adapter, rx_scrq);
2975                         napi_complete_done(napi, frames_processed);
2976                         return frames_processed;
2977                 }
2978
2979                 if (!pending_scrq(adapter, rx_scrq))
2980                         break;
2981                 next = ibmvnic_next_scrq(adapter, rx_scrq);
2982                 rx_buff = (struct ibmvnic_rx_buff *)
2983                           be64_to_cpu(next->rx_comp.correlator);
2984                 /* do error checking */
2985                 if (next->rx_comp.rc) {
2986                         netdev_dbg(netdev, "rx buffer returned with rc %x\n",
2987                                    be16_to_cpu(next->rx_comp.rc));
2988                         /* free the entry */
2989                         next->rx_comp.first = 0;
2990                         dev_kfree_skb_any(rx_buff->skb);
2991                         remove_buff_from_pool(adapter, rx_buff);
2992                         continue;
2993                 } else if (!rx_buff->skb) {
2994                         /* free the entry */
2995                         next->rx_comp.first = 0;
2996                         remove_buff_from_pool(adapter, rx_buff);
2997                         continue;
2998                 }
2999
3000                 length = be32_to_cpu(next->rx_comp.len);
3001                 offset = be16_to_cpu(next->rx_comp.off_frame_data);
3002                 flags = next->rx_comp.flags;
3003                 skb = rx_buff->skb;
3004                 /* load long_term_buff before copying to skb */
3005                 dma_rmb();
3006                 skb_copy_to_linear_data(skb, rx_buff->data + offset,
3007                                         length);
3008
3009                 /* VLAN Header has been stripped by the system firmware and
3010                  * needs to be inserted by the driver
3011                  */
3012                 if (adapter->rx_vlan_header_insertion &&
3013                     (flags & IBMVNIC_VLAN_STRIPPED))
3014                         __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
3015                                                ntohs(next->rx_comp.vlan_tci));
3016
3017                 /* free the entry */
3018                 next->rx_comp.first = 0;
3019                 remove_buff_from_pool(adapter, rx_buff);
3020
3021                 skb_put(skb, length);
3022                 skb->protocol = eth_type_trans(skb, netdev);
3023                 skb_record_rx_queue(skb, scrq_num);
3024
3025                 if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
3026                     flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
3027                         skb->ip_summed = CHECKSUM_UNNECESSARY;
3028                 }
3029
3030                 length = skb->len;
3031                 napi_gro_receive(napi, skb); /* send it up */
3032                 netdev->stats.rx_packets++;
3033                 netdev->stats.rx_bytes += length;
3034                 adapter->rx_stats_buffers[scrq_num].packets++;
3035                 adapter->rx_stats_buffers[scrq_num].bytes += length;
3036                 frames_processed++;
3037         }
3038
3039         if (adapter->state != VNIC_CLOSING &&
3040             ((atomic_read(&adapter->rx_pool[scrq_num].available) <
3041               adapter->req_rx_add_entries_per_subcrq / 2) ||
3042               frames_processed < budget))
3043                 replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
3044         if (frames_processed < budget) {
3045                 if (napi_complete_done(napi, frames_processed)) {
3046                         enable_scrq_irq(adapter, rx_scrq);
3047                         if (pending_scrq(adapter, rx_scrq)) {
3048                                 if (napi_reschedule(napi)) {
3049                                         disable_scrq_irq(adapter, rx_scrq);
3050                                         goto restart_poll;
3051                                 }
3052                         }
3053                 }
3054         }
3055         return frames_processed;
3056 }
3057
3058 static int wait_for_reset(struct ibmvnic_adapter *adapter)
3059 {
3060         int rc, ret;
3061
3062         adapter->fallback.mtu = adapter->req_mtu;
3063         adapter->fallback.rx_queues = adapter->req_rx_queues;
3064         adapter->fallback.tx_queues = adapter->req_tx_queues;
3065         adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq;
3066         adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;
3067
3068         reinit_completion(&adapter->reset_done);
3069         adapter->wait_for_reset = true;
3070         rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
3071
3072         if (rc) {
3073                 ret = rc;
3074                 goto out;
3075         }
3076         rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000);
3077         if (rc) {
3078                 ret = -ENODEV;
3079                 goto out;
3080         }
3081
3082         ret = 0;
3083         if (adapter->reset_done_rc) {
3084                 ret = -EIO;
3085                 adapter->desired.mtu = adapter->fallback.mtu;
3086                 adapter->desired.rx_queues = adapter->fallback.rx_queues;
3087                 adapter->desired.tx_queues = adapter->fallback.tx_queues;
3088                 adapter->desired.rx_entries = adapter->fallback.rx_entries;
3089                 adapter->desired.tx_entries = adapter->fallback.tx_entries;
3090
3091                 reinit_completion(&adapter->reset_done);
3092                 adapter->wait_for_reset = true;
3093                 rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
3094                 if (rc) {
3095                         ret = rc;
3096                         goto out;
3097                 }
3098                 rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done,
3099                                                  60000);
3100                 if (rc) {
3101                         ret = -ENODEV;
3102                         goto out;
3103                 }
3104         }
3105 out:
3106         adapter->wait_for_reset = false;
3107
3108         return ret;
3109 }
3110
3111 static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
3112 {
3113         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3114
3115         adapter->desired.mtu = new_mtu + ETH_HLEN;
3116
3117         return wait_for_reset(adapter);
3118 }
3119
3120 static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,
3121                                                 struct net_device *dev,
3122                                                 netdev_features_t features)
3123 {
3124         /* Some backing hardware adapters can not
3125          * handle packets with a MSS less than 224
3126          * or with only one segment.
3127          */
3128         if (skb_is_gso(skb)) {
3129                 if (skb_shinfo(skb)->gso_size < 224 ||
3130                     skb_shinfo(skb)->gso_segs == 1)
3131                         features &= ~NETIF_F_GSO_MASK;
3132         }
3133
3134         return features;
3135 }
3136
3137 static const struct net_device_ops ibmvnic_netdev_ops = {
3138         .ndo_open               = ibmvnic_open,
3139         .ndo_stop               = ibmvnic_close,
3140         .ndo_start_xmit         = ibmvnic_xmit,
3141         .ndo_set_rx_mode        = ibmvnic_set_multi,
3142         .ndo_set_mac_address    = ibmvnic_set_mac,
3143         .ndo_validate_addr      = eth_validate_addr,
3144         .ndo_tx_timeout         = ibmvnic_tx_timeout,
3145         .ndo_change_mtu         = ibmvnic_change_mtu,
3146         .ndo_features_check     = ibmvnic_features_check,
3147 };
3148
3149 /* ethtool functions */
3150
3151 static int ibmvnic_get_link_ksettings(struct net_device *netdev,
3152                                       struct ethtool_link_ksettings *cmd)
3153 {
3154         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3155         int rc;
3156
3157         rc = send_query_phys_parms(adapter);
3158         if (rc) {
3159                 adapter->speed = SPEED_UNKNOWN;
3160                 adapter->duplex = DUPLEX_UNKNOWN;
3161         }
3162         cmd->base.speed = adapter->speed;
3163         cmd->base.duplex = adapter->duplex;
3164         cmd->base.port = PORT_FIBRE;
3165         cmd->base.phy_address = 0;
3166         cmd->base.autoneg = AUTONEG_ENABLE;
3167
3168         return 0;
3169 }
3170
3171 static void ibmvnic_get_drvinfo(struct net_device *netdev,
3172                                 struct ethtool_drvinfo *info)
3173 {
3174         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3175
3176         strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
3177         strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
3178         strscpy(info->fw_version, adapter->fw_version,
3179                 sizeof(info->fw_version));
3180 }
3181
3182 static u32 ibmvnic_get_msglevel(struct net_device *netdev)
3183 {
3184         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3185
3186         return adapter->msg_enable;
3187 }
3188
3189 static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
3190 {
3191         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3192
3193         adapter->msg_enable = data;
3194 }
3195
3196 static u32 ibmvnic_get_link(struct net_device *netdev)
3197 {
3198         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3199
3200         /* Don't need to send a query because we request a logical link up at
3201          * init and then we wait for link state indications
3202          */
3203         return adapter->logical_link_state;
3204 }
3205
3206 static void ibmvnic_get_ringparam(struct net_device *netdev,
3207                                   struct ethtool_ringparam *ring,
3208                                   struct kernel_ethtool_ringparam *kernel_ring,
3209                                   struct netlink_ext_ack *extack)
3210 {
3211         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3212
3213         if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
3214                 ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
3215                 ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
3216         } else {
3217                 ring->rx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
3218                 ring->tx_max_pending = IBMVNIC_MAX_QUEUE_SZ;
3219         }
3220         ring->rx_mini_max_pending = 0;
3221         ring->rx_jumbo_max_pending = 0;
3222         ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
3223         ring->tx_pending = adapter->req_tx_entries_per_subcrq;
3224         ring->rx_mini_pending = 0;
3225         ring->rx_jumbo_pending = 0;
3226 }
3227
3228 static int ibmvnic_set_ringparam(struct net_device *netdev,
3229                                  struct ethtool_ringparam *ring,
3230                                  struct kernel_ethtool_ringparam *kernel_ring,
3231                                  struct netlink_ext_ack *extack)
3232 {
3233         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3234         int ret;
3235
3236         ret = 0;
3237         adapter->desired.rx_entries = ring->rx_pending;
3238         adapter->desired.tx_entries = ring->tx_pending;
3239
3240         ret = wait_for_reset(adapter);
3241
3242         if (!ret &&
3243             (adapter->req_rx_add_entries_per_subcrq != ring->rx_pending ||
3244              adapter->req_tx_entries_per_subcrq != ring->tx_pending))
3245                 netdev_info(netdev,
3246                             "Could not match full ringsize request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
3247                             ring->rx_pending, ring->tx_pending,
3248                             adapter->req_rx_add_entries_per_subcrq,
3249                             adapter->req_tx_entries_per_subcrq);
3250         return ret;
3251 }
3252
3253 static void ibmvnic_get_channels(struct net_device *netdev,
3254                                  struct ethtool_channels *channels)
3255 {
3256         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3257
3258         if (adapter->priv_flags & IBMVNIC_USE_SERVER_MAXES) {
3259                 channels->max_rx = adapter->max_rx_queues;
3260                 channels->max_tx = adapter->max_tx_queues;
3261         } else {
3262                 channels->max_rx = IBMVNIC_MAX_QUEUES;
3263                 channels->max_tx = IBMVNIC_MAX_QUEUES;
3264         }
3265
3266         channels->max_other = 0;
3267         channels->max_combined = 0;
3268         channels->rx_count = adapter->req_rx_queues;
3269         channels->tx_count = adapter->req_tx_queues;
3270         channels->other_count = 0;
3271         channels->combined_count = 0;
3272 }
3273
3274 static int ibmvnic_set_channels(struct net_device *netdev,
3275                                 struct ethtool_channels *channels)
3276 {
3277         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3278         int ret;
3279
3280         ret = 0;
3281         adapter->desired.rx_queues = channels->rx_count;
3282         adapter->desired.tx_queues = channels->tx_count;
3283
3284         ret = wait_for_reset(adapter);
3285
3286         if (!ret &&
3287             (adapter->req_rx_queues != channels->rx_count ||
3288              adapter->req_tx_queues != channels->tx_count))
3289                 netdev_info(netdev,
3290                             "Could not match full channels request. Requested: RX %d, TX %d; Allowed: RX %llu, TX %llu\n",
3291                             channels->rx_count, channels->tx_count,
3292                             adapter->req_rx_queues, adapter->req_tx_queues);
3293         return ret;
3294 }
3295
3296 static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
3297 {
3298         struct ibmvnic_adapter *adapter = netdev_priv(dev);
3299         int i;
3300
3301         switch (stringset) {
3302         case ETH_SS_STATS:
3303                 for (i = 0; i < ARRAY_SIZE(ibmvnic_stats);
3304                                 i++, data += ETH_GSTRING_LEN)
3305                         memcpy(data, ibmvnic_stats[i].name, ETH_GSTRING_LEN);
3306
3307                 for (i = 0; i < adapter->req_tx_queues; i++) {
3308                         snprintf(data, ETH_GSTRING_LEN, "tx%d_packets", i);
3309                         data += ETH_GSTRING_LEN;
3310
3311                         snprintf(data, ETH_GSTRING_LEN, "tx%d_bytes", i);
3312                         data += ETH_GSTRING_LEN;
3313
3314                         snprintf(data, ETH_GSTRING_LEN,
3315                                  "tx%d_dropped_packets", i);
3316                         data += ETH_GSTRING_LEN;
3317                 }
3318
3319                 for (i = 0; i < adapter->req_rx_queues; i++) {
3320                         snprintf(data, ETH_GSTRING_LEN, "rx%d_packets", i);
3321                         data += ETH_GSTRING_LEN;
3322
3323                         snprintf(data, ETH_GSTRING_LEN, "rx%d_bytes", i);
3324                         data += ETH_GSTRING_LEN;
3325
3326                         snprintf(data, ETH_GSTRING_LEN, "rx%d_interrupts", i);
3327                         data += ETH_GSTRING_LEN;
3328                 }
3329                 break;
3330
3331         case ETH_SS_PRIV_FLAGS:
3332                 for (i = 0; i < ARRAY_SIZE(ibmvnic_priv_flags); i++)
3333                         strcpy(data + i * ETH_GSTRING_LEN,
3334                                ibmvnic_priv_flags[i]);
3335                 break;
3336         default:
3337                 return;
3338         }
3339 }
3340
3341 static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
3342 {
3343         struct ibmvnic_adapter *adapter = netdev_priv(dev);
3344
3345         switch (sset) {
3346         case ETH_SS_STATS:
3347                 return ARRAY_SIZE(ibmvnic_stats) +
3348                        adapter->req_tx_queues * NUM_TX_STATS +
3349                        adapter->req_rx_queues * NUM_RX_STATS;
3350         case ETH_SS_PRIV_FLAGS:
3351                 return ARRAY_SIZE(ibmvnic_priv_flags);
3352         default:
3353                 return -EOPNOTSUPP;
3354         }
3355 }
3356
3357 static void ibmvnic_get_ethtool_stats(struct net_device *dev,
3358                                       struct ethtool_stats *stats, u64 *data)
3359 {
3360         struct ibmvnic_adapter *adapter = netdev_priv(dev);
3361         union ibmvnic_crq crq;
3362         int i, j;
3363         int rc;
3364
3365         memset(&crq, 0, sizeof(crq));
3366         crq.request_statistics.first = IBMVNIC_CRQ_CMD;
3367         crq.request_statistics.cmd = REQUEST_STATISTICS;
3368         crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
3369         crq.request_statistics.len =
3370             cpu_to_be32(sizeof(struct ibmvnic_statistics));
3371
3372         /* Wait for data to be written */
3373         reinit_completion(&adapter->stats_done);
3374         rc = ibmvnic_send_crq(adapter, &crq);
3375         if (rc)
3376                 return;
3377         rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000);
3378         if (rc)
3379                 return;
3380
3381         for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
3382                 data[i] = be64_to_cpu(IBMVNIC_GET_STAT
3383                                       (adapter, ibmvnic_stats[i].offset));
3384
3385         for (j = 0; j < adapter->req_tx_queues; j++) {
3386                 data[i] = adapter->tx_stats_buffers[j].packets;
3387                 i++;
3388                 data[i] = adapter->tx_stats_buffers[j].bytes;
3389                 i++;
3390                 data[i] = adapter->tx_stats_buffers[j].dropped_packets;
3391                 i++;
3392         }
3393
3394         for (j = 0; j < adapter->req_rx_queues; j++) {
3395                 data[i] = adapter->rx_stats_buffers[j].packets;
3396                 i++;
3397                 data[i] = adapter->rx_stats_buffers[j].bytes;
3398                 i++;
3399                 data[i] = adapter->rx_stats_buffers[j].interrupts;
3400                 i++;
3401         }
3402 }
3403
3404 static u32 ibmvnic_get_priv_flags(struct net_device *netdev)
3405 {
3406         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3407
3408         return adapter->priv_flags;
3409 }
3410
3411 static int ibmvnic_set_priv_flags(struct net_device *netdev, u32 flags)
3412 {
3413         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3414         bool which_maxes = !!(flags & IBMVNIC_USE_SERVER_MAXES);
3415
3416         if (which_maxes)
3417                 adapter->priv_flags |= IBMVNIC_USE_SERVER_MAXES;
3418         else
3419                 adapter->priv_flags &= ~IBMVNIC_USE_SERVER_MAXES;
3420
3421         return 0;
3422 }
3423
3424 static const struct ethtool_ops ibmvnic_ethtool_ops = {
3425         .get_drvinfo            = ibmvnic_get_drvinfo,
3426         .get_msglevel           = ibmvnic_get_msglevel,
3427         .set_msglevel           = ibmvnic_set_msglevel,
3428         .get_link               = ibmvnic_get_link,
3429         .get_ringparam          = ibmvnic_get_ringparam,
3430         .set_ringparam          = ibmvnic_set_ringparam,
3431         .get_channels           = ibmvnic_get_channels,
3432         .set_channels           = ibmvnic_set_channels,
3433         .get_strings            = ibmvnic_get_strings,
3434         .get_sset_count         = ibmvnic_get_sset_count,
3435         .get_ethtool_stats      = ibmvnic_get_ethtool_stats,
3436         .get_link_ksettings     = ibmvnic_get_link_ksettings,
3437         .get_priv_flags         = ibmvnic_get_priv_flags,
3438         .set_priv_flags         = ibmvnic_set_priv_flags,
3439 };
3440
3441 /* Routines for managing CRQs/sCRQs  */
3442
3443 static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
3444                                    struct ibmvnic_sub_crq_queue *scrq)
3445 {
3446         int rc;
3447
3448         if (!scrq) {
3449                 netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
3450                 return -EINVAL;
3451         }
3452
3453         if (scrq->irq) {
3454                 free_irq(scrq->irq, scrq);
3455                 irq_dispose_mapping(scrq->irq);
3456                 scrq->irq = 0;
3457         }
3458
3459         if (scrq->msgs) {
3460                 memset(scrq->msgs, 0, 4 * PAGE_SIZE);
3461                 atomic_set(&scrq->used, 0);
3462                 scrq->cur = 0;
3463                 scrq->ind_buf.index = 0;
3464         } else {
3465                 netdev_dbg(adapter->netdev, "Invalid scrq reset\n");
3466                 return -EINVAL;
3467         }
3468
3469         rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
3470                            4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
3471         return rc;
3472 }
3473
3474 static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
3475 {
3476         int i, rc;
3477
3478         if (!adapter->tx_scrq || !adapter->rx_scrq)
3479                 return -EINVAL;
3480
3481         for (i = 0; i < adapter->req_tx_queues; i++) {
3482                 netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i);
3483                 rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
3484                 if (rc)
3485                         return rc;
3486         }
3487
3488         for (i = 0; i < adapter->req_rx_queues; i++) {
3489                 netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i);
3490                 rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
3491                 if (rc)
3492                         return rc;
3493         }
3494
3495         return rc;
3496 }
3497
3498 static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
3499                                   struct ibmvnic_sub_crq_queue *scrq,
3500                                   bool do_h_free)
3501 {
3502         struct device *dev = &adapter->vdev->dev;
3503         long rc;
3504
3505         netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");
3506
3507         if (do_h_free) {
3508                 /* Close the sub-crqs */
3509                 do {
3510                         rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
3511                                                 adapter->vdev->unit_address,
3512                                                 scrq->crq_num);
3513                 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
3514
3515                 if (rc) {
3516                         netdev_err(adapter->netdev,
3517                                    "Failed to release sub-CRQ %16lx, rc = %ld\n",
3518                                    scrq->crq_num, rc);
3519                 }
3520         }
3521
3522         dma_free_coherent(dev,
3523                           IBMVNIC_IND_ARR_SZ,
3524                           scrq->ind_buf.indir_arr,
3525                           scrq->ind_buf.indir_dma);
3526
3527         dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
3528                          DMA_BIDIRECTIONAL);
3529         free_pages((unsigned long)scrq->msgs, 2);
3530         kfree(scrq);
3531 }
3532
3533 static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
3534                                                         *adapter)
3535 {
3536         struct device *dev = &adapter->vdev->dev;
3537         struct ibmvnic_sub_crq_queue *scrq;
3538         int rc;
3539
3540         scrq = kzalloc(sizeof(*scrq), GFP_KERNEL);
3541         if (!scrq)
3542                 return NULL;
3543
3544         scrq->msgs =
3545                 (union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2);
3546         if (!scrq->msgs) {
3547                 dev_warn(dev, "Couldn't allocate crq queue messages page\n");
3548                 goto zero_page_failed;
3549         }
3550
3551         scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
3552                                          DMA_BIDIRECTIONAL);
3553         if (dma_mapping_error(dev, scrq->msg_token)) {
3554                 dev_warn(dev, "Couldn't map crq queue messages page\n");
3555                 goto map_failed;
3556         }
3557
3558         rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
3559                            4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
3560
3561         if (rc == H_RESOURCE)
3562                 rc = ibmvnic_reset_crq(adapter);
3563
3564         if (rc == H_CLOSED) {
3565                 dev_warn(dev, "Partner adapter not ready, waiting.\n");
3566         } else if (rc) {
3567                 dev_warn(dev, "Error %d registering sub-crq\n", rc);
3568                 goto reg_failed;
3569         }
3570
3571         scrq->adapter = adapter;
3572         scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
3573         scrq->ind_buf.index = 0;
3574
3575         scrq->ind_buf.indir_arr =
3576                 dma_alloc_coherent(dev,
3577                                    IBMVNIC_IND_ARR_SZ,
3578                                    &scrq->ind_buf.indir_dma,
3579                                    GFP_KERNEL);
3580
3581         if (!scrq->ind_buf.indir_arr)
3582                 goto indir_failed;
3583
3584         spin_lock_init(&scrq->lock);
3585
3586         netdev_dbg(adapter->netdev,
3587                    "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
3588                    scrq->crq_num, scrq->hw_irq, scrq->irq);
3589
3590         return scrq;
3591
3592 indir_failed:
3593         do {
3594                 rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
3595                                         adapter->vdev->unit_address,
3596                                         scrq->crq_num);
3597         } while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
3598 reg_failed:
3599         dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
3600                          DMA_BIDIRECTIONAL);
3601 map_failed:
3602         free_pages((unsigned long)scrq->msgs, 2);
3603 zero_page_failed:
3604         kfree(scrq);
3605
3606         return NULL;
3607 }
3608
3609 static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free)
3610 {
3611         int i;
3612
3613         if (adapter->tx_scrq) {
3614                 for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
3615                         if (!adapter->tx_scrq[i])
3616                                 continue;
3617
3618                         netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n",
3619                                    i);
3620                         ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]);
3621                         if (adapter->tx_scrq[i]->irq) {
3622                                 free_irq(adapter->tx_scrq[i]->irq,
3623                                          adapter->tx_scrq[i]);
3624                                 irq_dispose_mapping(adapter->tx_scrq[i]->irq);
3625                                 adapter->tx_scrq[i]->irq = 0;
3626                         }
3627
3628                         release_sub_crq_queue(adapter, adapter->tx_scrq[i],
3629                                               do_h_free);
3630                 }
3631
3632                 kfree(adapter->tx_scrq);
3633                 adapter->tx_scrq = NULL;
3634                 adapter->num_active_tx_scrqs = 0;
3635         }
3636
3637         if (adapter->rx_scrq) {
3638                 for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
3639                         if (!adapter->rx_scrq[i])
3640                                 continue;
3641
3642                         netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n",
3643                                    i);
3644                         if (adapter->rx_scrq[i]->irq) {
3645                                 free_irq(adapter->rx_scrq[i]->irq,
3646                                          adapter->rx_scrq[i]);
3647                                 irq_dispose_mapping(adapter->rx_scrq[i]->irq);
3648                                 adapter->rx_scrq[i]->irq = 0;
3649                         }
3650
3651                         release_sub_crq_queue(adapter, adapter->rx_scrq[i],
3652                                               do_h_free);
3653                 }
3654
3655                 kfree(adapter->rx_scrq);
3656                 adapter->rx_scrq = NULL;
3657                 adapter->num_active_rx_scrqs = 0;
3658         }
3659 }
3660
3661 static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
3662                             struct ibmvnic_sub_crq_queue *scrq)
3663 {
3664         struct device *dev = &adapter->vdev->dev;
3665         unsigned long rc;
3666
3667         rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
3668                                 H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
3669         if (rc)
3670                 dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
3671                         scrq->hw_irq, rc);
3672         return rc;
3673 }
3674
3675 /* We can not use the IRQ chip EOI handler because that has the
3676  * unintended effect of changing the interrupt priority.
3677  */
3678 static void ibmvnic_xics_eoi(struct device *dev, struct ibmvnic_sub_crq_queue *scrq)
3679 {
3680         u64 val = 0xff000000 | scrq->hw_irq;
3681         unsigned long rc;
3682
3683         rc = plpar_hcall_norets(H_EOI, val);
3684         if (rc)
3685                 dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n", val, rc);
3686 }
3687
3688 /* Due to a firmware bug, the hypervisor can send an interrupt to a
3689  * transmit or receive queue just prior to a partition migration.
3690  * Force an EOI after migration.
3691  */
3692 static void ibmvnic_clear_pending_interrupt(struct device *dev,
3693                                             struct ibmvnic_sub_crq_queue *scrq)
3694 {
3695         if (!xive_enabled())
3696                 ibmvnic_xics_eoi(dev, scrq);
3697 }
3698
3699 static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
3700                            struct ibmvnic_sub_crq_queue *scrq)
3701 {
3702         struct device *dev = &adapter->vdev->dev;
3703         unsigned long rc;
3704
3705         if (scrq->hw_irq > 0x100000000ULL) {
3706                 dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
3707                 return 1;
3708         }
3709
3710         if (test_bit(0, &adapter->resetting) &&
3711             adapter->reset_reason == VNIC_RESET_MOBILITY) {
3712                 ibmvnic_clear_pending_interrupt(dev, scrq);
3713         }
3714
3715         rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
3716                                 H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
3717         if (rc)
3718                 dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
3719                         scrq->hw_irq, rc);
3720         return rc;
3721 }
3722
3723 static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
3724                                struct ibmvnic_sub_crq_queue *scrq)
3725 {
3726         struct device *dev = &adapter->vdev->dev;
3727         struct ibmvnic_tx_pool *tx_pool;
3728         struct ibmvnic_tx_buff *txbuff;
3729         struct netdev_queue *txq;
3730         union sub_crq *next;
3731         int index;
3732         int i;
3733
3734 restart_loop:
3735         while (pending_scrq(adapter, scrq)) {
3736                 unsigned int pool = scrq->pool_index;
3737                 int num_entries = 0;
3738                 int total_bytes = 0;
3739                 int num_packets = 0;
3740
3741                 next = ibmvnic_next_scrq(adapter, scrq);
3742                 for (i = 0; i < next->tx_comp.num_comps; i++) {
3743                         index = be32_to_cpu(next->tx_comp.correlators[i]);
3744                         if (index & IBMVNIC_TSO_POOL_MASK) {
3745                                 tx_pool = &adapter->tso_pool[pool];
3746                                 index &= ~IBMVNIC_TSO_POOL_MASK;
3747                         } else {
3748                                 tx_pool = &adapter->tx_pool[pool];
3749                         }
3750
3751                         txbuff = &tx_pool->tx_buff[index];
3752                         num_packets++;
3753                         num_entries += txbuff->num_entries;
3754                         if (txbuff->skb) {
3755                                 total_bytes += txbuff->skb->len;
3756                                 if (next->tx_comp.rcs[i]) {
3757                                         dev_err(dev, "tx error %x\n",
3758                                                 next->tx_comp.rcs[i]);
3759                                         dev_kfree_skb_irq(txbuff->skb);
3760                                 } else {
3761                                         dev_consume_skb_irq(txbuff->skb);
3762                                 }
3763                                 txbuff->skb = NULL;
3764                         } else {
3765                                 netdev_warn(adapter->netdev,
3766                                             "TX completion received with NULL socket buffer\n");
3767                         }
3768                         tx_pool->free_map[tx_pool->producer_index] = index;
3769                         tx_pool->producer_index =
3770                                 (tx_pool->producer_index + 1) %
3771                                         tx_pool->num_buffers;
3772                 }
3773                 /* remove tx_comp scrq*/
3774                 next->tx_comp.first = 0;
3775
3776                 txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
3777                 netdev_tx_completed_queue(txq, num_packets, total_bytes);
3778
3779                 if (atomic_sub_return(num_entries, &scrq->used) <=
3780                     (adapter->req_tx_entries_per_subcrq / 2) &&
3781                     __netif_subqueue_stopped(adapter->netdev,
3782                                              scrq->pool_index)) {
3783                         rcu_read_lock();
3784                         if (adapter->tx_queues_active) {
3785                                 netif_wake_subqueue(adapter->netdev,
3786                                                     scrq->pool_index);
3787                                 netdev_dbg(adapter->netdev,
3788                                            "Started queue %d\n",
3789                                            scrq->pool_index);
3790                         }
3791                         rcu_read_unlock();
3792                 }
3793         }
3794
3795         enable_scrq_irq(adapter, scrq);
3796
3797         if (pending_scrq(adapter, scrq)) {
3798                 disable_scrq_irq(adapter, scrq);
3799                 goto restart_loop;
3800         }
3801
3802         return 0;
3803 }
3804
3805 static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
3806 {
3807         struct ibmvnic_sub_crq_queue *scrq = instance;
3808         struct ibmvnic_adapter *adapter = scrq->adapter;
3809
3810         disable_scrq_irq(adapter, scrq);
3811         ibmvnic_complete_tx(adapter, scrq);
3812
3813         return IRQ_HANDLED;
3814 }
3815
3816 static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
3817 {
3818         struct ibmvnic_sub_crq_queue *scrq = instance;
3819         struct ibmvnic_adapter *adapter = scrq->adapter;
3820
3821         /* When booting a kdump kernel we can hit pending interrupts
3822          * prior to completing driver initialization.
3823          */
3824         if (unlikely(adapter->state != VNIC_OPEN))
3825                 return IRQ_NONE;
3826
3827         adapter->rx_stats_buffers[scrq->scrq_num].interrupts++;
3828
3829         if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
3830                 disable_scrq_irq(adapter, scrq);
3831                 __napi_schedule(&adapter->napi[scrq->scrq_num]);
3832         }
3833
3834         return IRQ_HANDLED;
3835 }
3836
3837 static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
3838 {
3839         struct device *dev = &adapter->vdev->dev;
3840         struct ibmvnic_sub_crq_queue *scrq;
3841         int i = 0, j = 0;
3842         int rc = 0;
3843
3844         for (i = 0; i < adapter->req_tx_queues; i++) {
3845                 netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n",
3846                            i);
3847                 scrq = adapter->tx_scrq[i];
3848                 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
3849
3850                 if (!scrq->irq) {
3851                         rc = -EINVAL;
3852                         dev_err(dev, "Error mapping irq\n");
3853                         goto req_tx_irq_failed;
3854                 }
3855
3856                 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
3857                          adapter->vdev->unit_address, i);
3858                 rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
3859                                  0, scrq->name, scrq);
3860
3861                 if (rc) {
3862                         dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
3863                                 scrq->irq, rc);
3864                         irq_dispose_mapping(scrq->irq);
3865                         goto req_tx_irq_failed;
3866                 }
3867         }
3868
3869         for (i = 0; i < adapter->req_rx_queues; i++) {
3870                 netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n",
3871                            i);
3872                 scrq = adapter->rx_scrq[i];
3873                 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
3874                 if (!scrq->irq) {
3875                         rc = -EINVAL;
3876                         dev_err(dev, "Error mapping irq\n");
3877                         goto req_rx_irq_failed;
3878                 }
3879                 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
3880                          adapter->vdev->unit_address, i);
3881                 rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
3882                                  0, scrq->name, scrq);
3883                 if (rc) {
3884                         dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
3885                                 scrq->irq, rc);
3886                         irq_dispose_mapping(scrq->irq);
3887                         goto req_rx_irq_failed;
3888                 }
3889         }
3890         return rc;
3891
3892 req_rx_irq_failed:
3893         for (j = 0; j < i; j++) {
3894                 free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
3895                 irq_dispose_mapping(adapter->rx_scrq[j]->irq);
3896         }
3897         i = adapter->req_tx_queues;
3898 req_tx_irq_failed:
3899         for (j = 0; j < i; j++) {
3900                 free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
3901                 irq_dispose_mapping(adapter->tx_scrq[j]->irq);
3902         }
3903         release_sub_crqs(adapter, 1);
3904         return rc;
3905 }
3906
3907 static int init_sub_crqs(struct ibmvnic_adapter *adapter)
3908 {
3909         struct device *dev = &adapter->vdev->dev;
3910         struct ibmvnic_sub_crq_queue **allqueues;
3911         int registered_queues = 0;
3912         int total_queues;
3913         int more = 0;
3914         int i;
3915
3916         total_queues = adapter->req_tx_queues + adapter->req_rx_queues;
3917
3918         allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL);
3919         if (!allqueues)
3920                 return -ENOMEM;
3921
3922         for (i = 0; i < total_queues; i++) {
3923                 allqueues[i] = init_sub_crq_queue(adapter);
3924                 if (!allqueues[i]) {
3925                         dev_warn(dev, "Couldn't allocate all sub-crqs\n");
3926                         break;
3927                 }
3928                 registered_queues++;
3929         }
3930
3931         /* Make sure we were able to register the minimum number of queues */
3932         if (registered_queues <
3933             adapter->min_tx_queues + adapter->min_rx_queues) {
3934                 dev_err(dev, "Fatal: Couldn't init  min number of sub-crqs\n");
3935                 goto tx_failed;
3936         }
3937
3938         /* Distribute the failed allocated queues*/
3939         for (i = 0; i < total_queues - registered_queues + more ; i++) {
3940                 netdev_dbg(adapter->netdev, "Reducing number of queues\n");
3941                 switch (i % 3) {
3942                 case 0:
3943                         if (adapter->req_rx_queues > adapter->min_rx_queues)
3944                                 adapter->req_rx_queues--;
3945                         else
3946                                 more++;
3947                         break;
3948                 case 1:
3949                         if (adapter->req_tx_queues > adapter->min_tx_queues)
3950                                 adapter->req_tx_queues--;
3951                         else
3952                                 more++;
3953                         break;
3954                 }
3955         }
3956
3957         adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
3958                                    sizeof(*adapter->tx_scrq), GFP_KERNEL);
3959         if (!adapter->tx_scrq)
3960                 goto tx_failed;
3961
3962         for (i = 0; i < adapter->req_tx_queues; i++) {
3963                 adapter->tx_scrq[i] = allqueues[i];
3964                 adapter->tx_scrq[i]->pool_index = i;
3965                 adapter->num_active_tx_scrqs++;
3966         }
3967
3968         adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
3969                                    sizeof(*adapter->rx_scrq), GFP_KERNEL);
3970         if (!adapter->rx_scrq)
3971                 goto rx_failed;
3972
3973         for (i = 0; i < adapter->req_rx_queues; i++) {
3974                 adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
3975                 adapter->rx_scrq[i]->scrq_num = i;
3976                 adapter->num_active_rx_scrqs++;
3977         }
3978
3979         kfree(allqueues);
3980         return 0;
3981
3982 rx_failed:
3983         kfree(adapter->tx_scrq);
3984         adapter->tx_scrq = NULL;
3985 tx_failed:
3986         for (i = 0; i < registered_queues; i++)
3987                 release_sub_crq_queue(adapter, allqueues[i], 1);
3988         kfree(allqueues);
3989         return -ENOMEM;
3990 }
3991
3992 static void send_request_cap(struct ibmvnic_adapter *adapter, int retry)
3993 {
3994         struct device *dev = &adapter->vdev->dev;
3995         union ibmvnic_crq crq;
3996         int max_entries;
3997         int cap_reqs;
3998
3999         /* We send out 6 or 7 REQUEST_CAPABILITY CRQs below (depending on
4000          * the PROMISC flag). Initialize this count upfront. When the tasklet
4001          * receives a response to all of these, it will send the next protocol
4002          * message (QUERY_IP_OFFLOAD).
4003          */
4004         if (!(adapter->netdev->flags & IFF_PROMISC) ||
4005             adapter->promisc_supported)
4006                 cap_reqs = 7;
4007         else
4008                 cap_reqs = 6;
4009
4010         if (!retry) {
4011                 /* Sub-CRQ entries are 32 byte long */
4012                 int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);
4013
4014                 atomic_set(&adapter->running_cap_crqs, cap_reqs);
4015
4016                 if (adapter->min_tx_entries_per_subcrq > entries_page ||
4017                     adapter->min_rx_add_entries_per_subcrq > entries_page) {
4018                         dev_err(dev, "Fatal, invalid entries per sub-crq\n");
4019                         return;
4020                 }
4021
4022                 if (adapter->desired.mtu)
4023                         adapter->req_mtu = adapter->desired.mtu;
4024                 else
4025                         adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;
4026
4027                 if (!adapter->desired.tx_entries)
4028                         adapter->desired.tx_entries =
4029                                         adapter->max_tx_entries_per_subcrq;
4030                 if (!adapter->desired.rx_entries)
4031                         adapter->desired.rx_entries =
4032                                         adapter->max_rx_add_entries_per_subcrq;
4033
4034                 max_entries = IBMVNIC_MAX_LTB_SIZE /
4035                               (adapter->req_mtu + IBMVNIC_BUFFER_HLEN);
4036
4037                 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
4038                         adapter->desired.tx_entries > IBMVNIC_MAX_LTB_SIZE) {
4039                         adapter->desired.tx_entries = max_entries;
4040                 }
4041
4042                 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
4043                         adapter->desired.rx_entries > IBMVNIC_MAX_LTB_SIZE) {
4044                         adapter->desired.rx_entries = max_entries;
4045                 }
4046
4047                 if (adapter->desired.tx_entries)
4048                         adapter->req_tx_entries_per_subcrq =
4049                                         adapter->desired.tx_entries;
4050                 else
4051                         adapter->req_tx_entries_per_subcrq =
4052                                         adapter->max_tx_entries_per_subcrq;
4053
4054                 if (adapter->desired.rx_entries)
4055                         adapter->req_rx_add_entries_per_subcrq =
4056                                         adapter->desired.rx_entries;
4057                 else
4058                         adapter->req_rx_add_entries_per_subcrq =
4059                                         adapter->max_rx_add_entries_per_subcrq;
4060
4061                 if (adapter->desired.tx_queues)
4062                         adapter->req_tx_queues =
4063                                         adapter->desired.tx_queues;
4064                 else
4065                         adapter->req_tx_queues =
4066                                         adapter->opt_tx_comp_sub_queues;
4067
4068                 if (adapter->desired.rx_queues)
4069                         adapter->req_rx_queues =
4070                                         adapter->desired.rx_queues;
4071                 else
4072                         adapter->req_rx_queues =
4073                                         adapter->opt_rx_comp_queues;
4074
4075                 adapter->req_rx_add_queues = adapter->max_rx_add_queues;
4076         } else {
4077                 atomic_add(cap_reqs, &adapter->running_cap_crqs);
4078         }
4079         memset(&crq, 0, sizeof(crq));
4080         crq.request_capability.first = IBMVNIC_CRQ_CMD;
4081         crq.request_capability.cmd = REQUEST_CAPABILITY;
4082
4083         crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
4084         crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
4085         cap_reqs--;
4086         ibmvnic_send_crq(adapter, &crq);
4087
4088         crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
4089         crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
4090         cap_reqs--;
4091         ibmvnic_send_crq(adapter, &crq);
4092
4093         crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
4094         crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
4095         cap_reqs--;
4096         ibmvnic_send_crq(adapter, &crq);
4097
4098         crq.request_capability.capability =
4099             cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
4100         crq.request_capability.number =
4101             cpu_to_be64(adapter->req_tx_entries_per_subcrq);
4102         cap_reqs--;
4103         ibmvnic_send_crq(adapter, &crq);
4104
4105         crq.request_capability.capability =
4106             cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
4107         crq.request_capability.number =
4108             cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
4109         cap_reqs--;
4110         ibmvnic_send_crq(adapter, &crq);
4111
4112         crq.request_capability.capability = cpu_to_be16(REQ_MTU);
4113         crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
4114         cap_reqs--;
4115         ibmvnic_send_crq(adapter, &crq);
4116
4117         if (adapter->netdev->flags & IFF_PROMISC) {
4118                 if (adapter->promisc_supported) {
4119                         crq.request_capability.capability =
4120                             cpu_to_be16(PROMISC_REQUESTED);
4121                         crq.request_capability.number = cpu_to_be64(1);
4122                         cap_reqs--;
4123                         ibmvnic_send_crq(adapter, &crq);
4124                 }
4125         } else {
4126                 crq.request_capability.capability =
4127                     cpu_to_be16(PROMISC_REQUESTED);
4128                 crq.request_capability.number = cpu_to_be64(0);
4129                 cap_reqs--;
4130                 ibmvnic_send_crq(adapter, &crq);
4131         }
4132
4133         /* Keep at end to catch any discrepancy between expected and actual
4134          * CRQs sent.
4135          */
4136         WARN_ON(cap_reqs != 0);
4137 }
4138
4139 static int pending_scrq(struct ibmvnic_adapter *adapter,
4140                         struct ibmvnic_sub_crq_queue *scrq)
4141 {
4142         union sub_crq *entry = &scrq->msgs[scrq->cur];
4143         int rc;
4144
4145         rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);
4146
4147         /* Ensure that the SCRQ valid flag is loaded prior to loading the
4148          * contents of the SCRQ descriptor
4149          */
4150         dma_rmb();
4151
4152         return rc;
4153 }
4154
4155 static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
4156                                         struct ibmvnic_sub_crq_queue *scrq)
4157 {
4158         union sub_crq *entry;
4159         unsigned long flags;
4160
4161         spin_lock_irqsave(&scrq->lock, flags);
4162         entry = &scrq->msgs[scrq->cur];
4163         if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
4164                 if (++scrq->cur == scrq->size)
4165                         scrq->cur = 0;
4166         } else {
4167                 entry = NULL;
4168         }
4169         spin_unlock_irqrestore(&scrq->lock, flags);
4170
4171         /* Ensure that the SCRQ valid flag is loaded prior to loading the
4172          * contents of the SCRQ descriptor
4173          */
4174         dma_rmb();
4175
4176         return entry;
4177 }
4178
4179 static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
4180 {
4181         struct ibmvnic_crq_queue *queue = &adapter->crq;
4182         union ibmvnic_crq *crq;
4183
4184         crq = &queue->msgs[queue->cur];
4185         if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
4186                 if (++queue->cur == queue->size)
4187                         queue->cur = 0;
4188         } else {
4189                 crq = NULL;
4190         }
4191
4192         return crq;
4193 }
4194
4195 static void print_subcrq_error(struct device *dev, int rc, const char *func)
4196 {
4197         switch (rc) {
4198         case H_PARAMETER:
4199                 dev_warn_ratelimited(dev,
4200                                      "%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n",
4201                                      func, rc);
4202                 break;
4203         case H_CLOSED:
4204                 dev_warn_ratelimited(dev,
4205                                      "%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n",
4206                                      func, rc);
4207                 break;
4208         default:
4209                 dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc);
4210                 break;
4211         }
4212 }
4213
4214 static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
4215                                 u64 remote_handle, u64 ioba, u64 num_entries)
4216 {
4217         unsigned int ua = adapter->vdev->unit_address;
4218         struct device *dev = &adapter->vdev->dev;
4219         int rc;
4220
4221         /* Make sure the hypervisor sees the complete request */
4222         dma_wmb();
4223         rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
4224                                 cpu_to_be64(remote_handle),
4225                                 ioba, num_entries);
4226
4227         if (rc)
4228                 print_subcrq_error(dev, rc, __func__);
4229
4230         return rc;
4231 }
4232
4233 static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
4234                             union ibmvnic_crq *crq)
4235 {
4236         unsigned int ua = adapter->vdev->unit_address;
4237         struct device *dev = &adapter->vdev->dev;
4238         u64 *u64_crq = (u64 *)crq;
4239         int rc;
4240
4241         netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
4242                    (unsigned long)cpu_to_be64(u64_crq[0]),
4243                    (unsigned long)cpu_to_be64(u64_crq[1]));
4244
4245         if (!adapter->crq.active &&
4246             crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
4247                 dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");
4248                 return -EINVAL;
4249         }
4250
4251         /* Make sure the hypervisor sees the complete request */
4252         dma_wmb();
4253
4254         rc = plpar_hcall_norets(H_SEND_CRQ, ua,
4255                                 cpu_to_be64(u64_crq[0]),
4256                                 cpu_to_be64(u64_crq[1]));
4257
4258         if (rc) {
4259                 if (rc == H_CLOSED) {
4260                         dev_warn(dev, "CRQ Queue closed\n");
4261                         /* do not reset, report the fail, wait for passive init from server */
4262                 }
4263
4264                 dev_warn(dev, "Send error (rc=%d)\n", rc);
4265         }
4266
4267         return rc;
4268 }
4269
4270 static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
4271 {
4272         struct device *dev = &adapter->vdev->dev;
4273         union ibmvnic_crq crq;
4274         int retries = 100;
4275         int rc;
4276
4277         memset(&crq, 0, sizeof(crq));
4278         crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
4279         crq.generic.cmd = IBMVNIC_CRQ_INIT;
4280         netdev_dbg(adapter->netdev, "Sending CRQ init\n");
4281
4282         do {
4283                 rc = ibmvnic_send_crq(adapter, &crq);
4284                 if (rc != H_CLOSED)
4285                         break;
4286                 retries--;
4287                 msleep(50);
4288
4289         } while (retries > 0);
4290
4291         if (rc) {
4292                 dev_err(dev, "Failed to send init request, rc = %d\n", rc);
4293                 return rc;
4294         }
4295
4296         return 0;
4297 }
4298
4299 struct vnic_login_client_data {
4300         u8      type;
4301         __be16  len;
4302         char    name[];
4303 } __packed;
4304
4305 static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
4306 {
4307         int len;
4308
4309         /* Calculate the amount of buffer space needed for the
4310          * vnic client data in the login buffer. There are four entries,
4311          * OS name, LPAR name, device name, and a null last entry.
4312          */
4313         len = 4 * sizeof(struct vnic_login_client_data);
4314         len += 6; /* "Linux" plus NULL */
4315         len += strlen(utsname()->nodename) + 1;
4316         len += strlen(adapter->netdev->name) + 1;
4317
4318         return len;
4319 }
4320
4321 static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
4322                                  struct vnic_login_client_data *vlcd)
4323 {
4324         const char *os_name = "Linux";
4325         int len;
4326
4327         /* Type 1 - LPAR OS */
4328         vlcd->type = 1;
4329         len = strlen(os_name) + 1;
4330         vlcd->len = cpu_to_be16(len);
4331         strscpy(vlcd->name, os_name, len);
4332         vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
4333
4334         /* Type 2 - LPAR name */
4335         vlcd->type = 2;
4336         len = strlen(utsname()->nodename) + 1;
4337         vlcd->len = cpu_to_be16(len);
4338         strscpy(vlcd->name, utsname()->nodename, len);
4339         vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
4340
4341         /* Type 3 - device name */
4342         vlcd->type = 3;
4343         len = strlen(adapter->netdev->name) + 1;
4344         vlcd->len = cpu_to_be16(len);
4345         strscpy(vlcd->name, adapter->netdev->name, len);
4346 }
4347
4348 static int send_login(struct ibmvnic_adapter *adapter)
4349 {
4350         struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
4351         struct ibmvnic_login_buffer *login_buffer;
4352         struct device *dev = &adapter->vdev->dev;
4353         struct vnic_login_client_data *vlcd;
4354         dma_addr_t rsp_buffer_token;
4355         dma_addr_t buffer_token;
4356         size_t rsp_buffer_size;
4357         union ibmvnic_crq crq;
4358         int client_data_len;
4359         size_t buffer_size;
4360         __be64 *tx_list_p;
4361         __be64 *rx_list_p;
4362         int rc;
4363         int i;
4364
4365         if (!adapter->tx_scrq || !adapter->rx_scrq) {
4366                 netdev_err(adapter->netdev,
4367                            "RX or TX queues are not allocated, device login failed\n");
4368                 return -ENOMEM;
4369         }
4370
4371         release_login_buffer(adapter);
4372         release_login_rsp_buffer(adapter);
4373
4374         client_data_len = vnic_client_data_len(adapter);
4375
4376         buffer_size =
4377             sizeof(struct ibmvnic_login_buffer) +
4378             sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) +
4379             client_data_len;
4380
4381         login_buffer = kzalloc(buffer_size, GFP_ATOMIC);
4382         if (!login_buffer)
4383                 goto buf_alloc_failed;
4384
4385         buffer_token = dma_map_single(dev, login_buffer, buffer_size,
4386                                       DMA_TO_DEVICE);
4387         if (dma_mapping_error(dev, buffer_token)) {
4388                 dev_err(dev, "Couldn't map login buffer\n");
4389                 goto buf_map_failed;
4390         }
4391
4392         rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
4393                           sizeof(u64) * adapter->req_tx_queues +
4394                           sizeof(u64) * adapter->req_rx_queues +
4395                           sizeof(u64) * adapter->req_rx_queues +
4396                           sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;
4397
4398         login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
4399         if (!login_rsp_buffer)
4400                 goto buf_rsp_alloc_failed;
4401
4402         rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
4403                                           rsp_buffer_size, DMA_FROM_DEVICE);
4404         if (dma_mapping_error(dev, rsp_buffer_token)) {
4405                 dev_err(dev, "Couldn't map login rsp buffer\n");
4406                 goto buf_rsp_map_failed;
4407         }
4408
4409         adapter->login_buf = login_buffer;
4410         adapter->login_buf_token = buffer_token;
4411         adapter->login_buf_sz = buffer_size;
4412         adapter->login_rsp_buf = login_rsp_buffer;
4413         adapter->login_rsp_buf_token = rsp_buffer_token;
4414         adapter->login_rsp_buf_sz = rsp_buffer_size;
4415
4416         login_buffer->len = cpu_to_be32(buffer_size);
4417         login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
4418         login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
4419         login_buffer->off_txcomp_subcrqs =
4420             cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
4421         login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
4422         login_buffer->off_rxcomp_subcrqs =
4423             cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
4424                         sizeof(u64) * adapter->req_tx_queues);
4425         login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
4426         login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);
4427
4428         tx_list_p = (__be64 *)((char *)login_buffer +
4429                                       sizeof(struct ibmvnic_login_buffer));
4430         rx_list_p = (__be64 *)((char *)login_buffer +
4431                                       sizeof(struct ibmvnic_login_buffer) +
4432                                       sizeof(u64) * adapter->req_tx_queues);
4433
4434         for (i = 0; i < adapter->req_tx_queues; i++) {
4435                 if (adapter->tx_scrq[i]) {
4436                         tx_list_p[i] =
4437                                 cpu_to_be64(adapter->tx_scrq[i]->crq_num);
4438                 }
4439         }
4440
4441         for (i = 0; i < adapter->req_rx_queues; i++) {
4442                 if (adapter->rx_scrq[i]) {
4443                         rx_list_p[i] =
4444                                 cpu_to_be64(adapter->rx_scrq[i]->crq_num);
4445                 }
4446         }
4447
4448         /* Insert vNIC login client data */
4449         vlcd = (struct vnic_login_client_data *)
4450                 ((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues));
4451         login_buffer->client_data_offset =
4452                         cpu_to_be32((char *)vlcd - (char *)login_buffer);
4453         login_buffer->client_data_len = cpu_to_be32(client_data_len);
4454
4455         vnic_add_client_data(adapter, vlcd);
4456
4457         netdev_dbg(adapter->netdev, "Login Buffer:\n");
4458         for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
4459                 netdev_dbg(adapter->netdev, "%016lx\n",
4460                            ((unsigned long *)(adapter->login_buf))[i]);
4461         }
4462
4463         memset(&crq, 0, sizeof(crq));
4464         crq.login.first = IBMVNIC_CRQ_CMD;
4465         crq.login.cmd = LOGIN;
4466         crq.login.ioba = cpu_to_be32(buffer_token);
4467         crq.login.len = cpu_to_be32(buffer_size);
4468
4469         adapter->login_pending = true;
4470         rc = ibmvnic_send_crq(adapter, &crq);
4471         if (rc) {
4472                 adapter->login_pending = false;
4473                 netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
4474                 goto buf_rsp_map_failed;
4475         }
4476
4477         return 0;
4478
4479 buf_rsp_map_failed:
4480         kfree(login_rsp_buffer);
4481         adapter->login_rsp_buf = NULL;
4482 buf_rsp_alloc_failed:
4483         dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
4484 buf_map_failed:
4485         kfree(login_buffer);
4486         adapter->login_buf = NULL;
4487 buf_alloc_failed:
4488         return -ENOMEM;
4489 }
4490
4491 static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
4492                             u32 len, u8 map_id)
4493 {
4494         union ibmvnic_crq crq;
4495
4496         memset(&crq, 0, sizeof(crq));
4497         crq.request_map.first = IBMVNIC_CRQ_CMD;
4498         crq.request_map.cmd = REQUEST_MAP;
4499         crq.request_map.map_id = map_id;
4500         crq.request_map.ioba = cpu_to_be32(addr);
4501         crq.request_map.len = cpu_to_be32(len);
4502         return ibmvnic_send_crq(adapter, &crq);
4503 }
4504
4505 static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
4506 {
4507         union ibmvnic_crq crq;
4508
4509         memset(&crq, 0, sizeof(crq));
4510         crq.request_unmap.first = IBMVNIC_CRQ_CMD;
4511         crq.request_unmap.cmd = REQUEST_UNMAP;
4512         crq.request_unmap.map_id = map_id;
4513         return ibmvnic_send_crq(adapter, &crq);
4514 }
4515
4516 static void send_query_map(struct ibmvnic_adapter *adapter)
4517 {
4518         union ibmvnic_crq crq;
4519
4520         memset(&crq, 0, sizeof(crq));
4521         crq.query_map.first = IBMVNIC_CRQ_CMD;
4522         crq.query_map.cmd = QUERY_MAP;
4523         ibmvnic_send_crq(adapter, &crq);
4524 }
4525
4526 /* Send a series of CRQs requesting various capabilities of the VNIC server */
4527 static void send_query_cap(struct ibmvnic_adapter *adapter)
4528 {
4529         union ibmvnic_crq crq;
4530         int cap_reqs;
4531
4532         /* We send out 25 QUERY_CAPABILITY CRQs below.  Initialize this count
4533          * upfront. When the tasklet receives a response to all of these, it
4534          * can send out the next protocol messaage (REQUEST_CAPABILITY).
4535          */
4536         cap_reqs = 25;
4537
4538         atomic_set(&adapter->running_cap_crqs, cap_reqs);
4539
4540         memset(&crq, 0, sizeof(crq));
4541         crq.query_capability.first = IBMVNIC_CRQ_CMD;
4542         crq.query_capability.cmd = QUERY_CAPABILITY;
4543
4544         crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
4545         ibmvnic_send_crq(adapter, &crq);
4546         cap_reqs--;
4547
4548         crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
4549         ibmvnic_send_crq(adapter, &crq);
4550         cap_reqs--;
4551
4552         crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
4553         ibmvnic_send_crq(adapter, &crq);
4554         cap_reqs--;
4555
4556         crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
4557         ibmvnic_send_crq(adapter, &crq);
4558         cap_reqs--;
4559
4560         crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
4561         ibmvnic_send_crq(adapter, &crq);
4562         cap_reqs--;
4563
4564         crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
4565         ibmvnic_send_crq(adapter, &crq);
4566         cap_reqs--;
4567
4568         crq.query_capability.capability =
4569             cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
4570         ibmvnic_send_crq(adapter, &crq);
4571         cap_reqs--;
4572
4573         crq.query_capability.capability =
4574             cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
4575         ibmvnic_send_crq(adapter, &crq);
4576         cap_reqs--;
4577
4578         crq.query_capability.capability =
4579             cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
4580         ibmvnic_send_crq(adapter, &crq);
4581         cap_reqs--;
4582
4583         crq.query_capability.capability =
4584             cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
4585         ibmvnic_send_crq(adapter, &crq);
4586         cap_reqs--;
4587
4588         crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
4589         ibmvnic_send_crq(adapter, &crq);
4590         cap_reqs--;
4591
4592         crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
4593         ibmvnic_send_crq(adapter, &crq);
4594         cap_reqs--;
4595
4596         crq.query_capability.capability = cpu_to_be16(MIN_MTU);
4597         ibmvnic_send_crq(adapter, &crq);
4598         cap_reqs--;
4599
4600         crq.query_capability.capability = cpu_to_be16(MAX_MTU);
4601         ibmvnic_send_crq(adapter, &crq);
4602         cap_reqs--;
4603
4604         crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
4605         ibmvnic_send_crq(adapter, &crq);
4606         cap_reqs--;
4607
4608         crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
4609         ibmvnic_send_crq(adapter, &crq);
4610         cap_reqs--;
4611
4612         crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION);
4613         ibmvnic_send_crq(adapter, &crq);
4614         cap_reqs--;
4615
4616         crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
4617         ibmvnic_send_crq(adapter, &crq);
4618         cap_reqs--;
4619
4620         crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
4621         ibmvnic_send_crq(adapter, &crq);
4622         cap_reqs--;
4623
4624         crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
4625         ibmvnic_send_crq(adapter, &crq);
4626         cap_reqs--;
4627
4628         crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
4629         ibmvnic_send_crq(adapter, &crq);
4630         cap_reqs--;
4631
4632         crq.query_capability.capability =
4633                         cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
4634         ibmvnic_send_crq(adapter, &crq);
4635         cap_reqs--;
4636
4637         crq.query_capability.capability =
4638                         cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
4639         ibmvnic_send_crq(adapter, &crq);
4640         cap_reqs--;
4641
4642         crq.query_capability.capability =
4643                         cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
4644         ibmvnic_send_crq(adapter, &crq);
4645         cap_reqs--;
4646
4647         crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);
4648
4649         ibmvnic_send_crq(adapter, &crq);
4650         cap_reqs--;
4651
4652         /* Keep at end to catch any discrepancy between expected and actual
4653          * CRQs sent.
4654          */
4655         WARN_ON(cap_reqs != 0);
4656 }
4657
4658 static void send_query_ip_offload(struct ibmvnic_adapter *adapter)
4659 {
4660         int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
4661         struct device *dev = &adapter->vdev->dev;
4662         union ibmvnic_crq crq;
4663
4664         adapter->ip_offload_tok =
4665                 dma_map_single(dev,
4666                                &adapter->ip_offload_buf,
4667                                buf_sz,
4668                                DMA_FROM_DEVICE);
4669
4670         if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
4671                 if (!firmware_has_feature(FW_FEATURE_CMO))
4672                         dev_err(dev, "Couldn't map offload buffer\n");
4673                 return;
4674         }
4675
4676         memset(&crq, 0, sizeof(crq));
4677         crq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
4678         crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
4679         crq.query_ip_offload.len = cpu_to_be32(buf_sz);
4680         crq.query_ip_offload.ioba =
4681             cpu_to_be32(adapter->ip_offload_tok);
4682
4683         ibmvnic_send_crq(adapter, &crq);
4684 }
4685
4686 static void send_control_ip_offload(struct ibmvnic_adapter *adapter)
4687 {
4688         struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl;
4689         struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
4690         struct device *dev = &adapter->vdev->dev;
4691         netdev_features_t old_hw_features = 0;
4692         union ibmvnic_crq crq;
4693
4694         adapter->ip_offload_ctrl_tok =
4695                 dma_map_single(dev,
4696                                ctrl_buf,
4697                                sizeof(adapter->ip_offload_ctrl),
4698                                DMA_TO_DEVICE);
4699
4700         if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
4701                 dev_err(dev, "Couldn't map ip offload control buffer\n");
4702                 return;
4703         }
4704
4705         ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
4706         ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB);
4707         ctrl_buf->ipv4_chksum = buf->ipv4_chksum;
4708         ctrl_buf->ipv6_chksum = buf->ipv6_chksum;
4709         ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
4710         ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum;
4711         ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
4712         ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum;
4713         ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4;
4714         ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6;
4715
4716         /* large_rx disabled for now, additional features needed */
4717         ctrl_buf->large_rx_ipv4 = 0;
4718         ctrl_buf->large_rx_ipv6 = 0;
4719
4720         if (adapter->state != VNIC_PROBING) {
4721                 old_hw_features = adapter->netdev->hw_features;
4722                 adapter->netdev->hw_features = 0;
4723         }
4724
4725         adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;
4726
4727         if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
4728                 adapter->netdev->hw_features |= NETIF_F_IP_CSUM;
4729
4730         if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
4731                 adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM;
4732
4733         if ((adapter->netdev->features &
4734             (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
4735                 adapter->netdev->hw_features |= NETIF_F_RXCSUM;
4736
4737         if (buf->large_tx_ipv4)
4738                 adapter->netdev->hw_features |= NETIF_F_TSO;
4739         if (buf->large_tx_ipv6)
4740                 adapter->netdev->hw_features |= NETIF_F_TSO6;
4741
4742         if (adapter->state == VNIC_PROBING) {
4743                 adapter->netdev->features |= adapter->netdev->hw_features;
4744         } else if (old_hw_features != adapter->netdev->hw_features) {
4745                 netdev_features_t tmp = 0;
4746
4747                 /* disable features no longer supported */
4748                 adapter->netdev->features &= adapter->netdev->hw_features;
4749                 /* turn on features now supported if previously enabled */
4750                 tmp = (old_hw_features ^ adapter->netdev->hw_features) &
4751                         adapter->netdev->hw_features;
4752                 adapter->netdev->features |=
4753                                 tmp & adapter->netdev->wanted_features;
4754         }
4755
4756         memset(&crq, 0, sizeof(crq));
4757         crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
4758         crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
4759         crq.control_ip_offload.len =
4760             cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
4761         crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
4762         ibmvnic_send_crq(adapter, &crq);
4763 }
4764
4765 static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
4766                                 struct ibmvnic_adapter *adapter)
4767 {
4768         struct device *dev = &adapter->vdev->dev;
4769
4770         if (crq->get_vpd_size_rsp.rc.code) {
4771                 dev_err(dev, "Error retrieving VPD size, rc=%x\n",
4772                         crq->get_vpd_size_rsp.rc.code);
4773                 complete(&adapter->fw_done);
4774                 return;
4775         }
4776
4777         adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
4778         complete(&adapter->fw_done);
4779 }
4780
4781 static void handle_vpd_rsp(union ibmvnic_crq *crq,
4782                            struct ibmvnic_adapter *adapter)
4783 {
4784         struct device *dev = &adapter->vdev->dev;
4785         unsigned char *substr = NULL;
4786         u8 fw_level_len = 0;
4787
4788         memset(adapter->fw_version, 0, 32);
4789
4790         dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
4791                          DMA_FROM_DEVICE);
4792
4793         if (crq->get_vpd_rsp.rc.code) {
4794                 dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
4795                         crq->get_vpd_rsp.rc.code);
4796                 goto complete;
4797         }
4798
4799         /* get the position of the firmware version info
4800          * located after the ASCII 'RM' substring in the buffer
4801          */
4802         substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
4803         if (!substr) {
4804                 dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n");
4805                 goto complete;
4806         }
4807
4808         /* get length of firmware level ASCII substring */
4809         if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
4810                 fw_level_len = *(substr + 2);
4811         } else {
4812                 dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
4813                 goto complete;
4814         }
4815
4816         /* copy firmware version string from vpd into adapter */
4817         if ((substr + 3 + fw_level_len) <
4818             (adapter->vpd->buff + adapter->vpd->len)) {
4819                 strncpy((char *)adapter->fw_version, substr + 3, fw_level_len);
4820         } else {
4821                 dev_info(dev, "FW substr extrapolated VPD buff\n");
4822         }
4823
4824 complete:
4825         if (adapter->fw_version[0] == '\0')
4826                 strscpy((char *)adapter->fw_version, "N/A", sizeof(adapter->fw_version));
4827         complete(&adapter->fw_done);
4828 }
4829
4830 static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
4831 {
4832         struct device *dev = &adapter->vdev->dev;
4833         struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
4834         int i;
4835
4836         dma_unmap_single(dev, adapter->ip_offload_tok,
4837                          sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);
4838
4839         netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
4840         for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
4841                 netdev_dbg(adapter->netdev, "%016lx\n",
4842                            ((unsigned long *)(buf))[i]);
4843
4844         netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
4845         netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
4846         netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
4847                    buf->tcp_ipv4_chksum);
4848         netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
4849                    buf->tcp_ipv6_chksum);
4850         netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
4851                    buf->udp_ipv4_chksum);
4852         netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
4853                    buf->udp_ipv6_chksum);
4854         netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
4855                    buf->large_tx_ipv4);
4856         netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
4857                    buf->large_tx_ipv6);
4858         netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
4859                    buf->large_rx_ipv4);
4860         netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
4861                    buf->large_rx_ipv6);
4862         netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
4863                    buf->max_ipv4_header_size);
4864         netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
4865                    buf->max_ipv6_header_size);
4866         netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
4867                    buf->max_tcp_header_size);
4868         netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
4869                    buf->max_udp_header_size);
4870         netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
4871                    buf->max_large_tx_size);
4872         netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
4873                    buf->max_large_rx_size);
4874         netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
4875                    buf->ipv6_extension_header);
4876         netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
4877                    buf->tcp_pseudosum_req);
4878         netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
4879                    buf->num_ipv6_ext_headers);
4880         netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
4881                    buf->off_ipv6_ext_headers);
4882
4883         send_control_ip_offload(adapter);
4884 }
4885
4886 static const char *ibmvnic_fw_err_cause(u16 cause)
4887 {
4888         switch (cause) {
4889         case ADAPTER_PROBLEM:
4890                 return "adapter problem";
4891         case BUS_PROBLEM:
4892                 return "bus problem";
4893         case FW_PROBLEM:
4894                 return "firmware problem";
4895         case DD_PROBLEM:
4896                 return "device driver problem";
4897         case EEH_RECOVERY:
4898                 return "EEH recovery";
4899         case FW_UPDATED:
4900                 return "firmware updated";
4901         case LOW_MEMORY:
4902                 return "low Memory";
4903         default:
4904                 return "unknown";
4905         }
4906 }
4907
4908 static void handle_error_indication(union ibmvnic_crq *crq,
4909                                     struct ibmvnic_adapter *adapter)
4910 {
4911         struct device *dev = &adapter->vdev->dev;
4912         u16 cause;
4913
4914         cause = be16_to_cpu(crq->error_indication.error_cause);
4915
4916         dev_warn_ratelimited(dev,
4917                              "Firmware reports %serror, cause: %s. Starting recovery...\n",
4918                              crq->error_indication.flags
4919                                 & IBMVNIC_FATAL_ERROR ? "FATAL " : "",
4920                              ibmvnic_fw_err_cause(cause));
4921
4922         if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR)
4923                 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
4924         else
4925                 ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL);
4926 }
4927
4928 static int handle_change_mac_rsp(union ibmvnic_crq *crq,
4929                                  struct ibmvnic_adapter *adapter)
4930 {
4931         struct net_device *netdev = adapter->netdev;
4932         struct device *dev = &adapter->vdev->dev;
4933         long rc;
4934
4935         rc = crq->change_mac_addr_rsp.rc.code;
4936         if (rc) {
4937                 dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
4938                 goto out;
4939         }
4940         /* crq->change_mac_addr.mac_addr is the requested one
4941          * crq->change_mac_addr_rsp.mac_addr is the returned valid one.
4942          */
4943         eth_hw_addr_set(netdev, &crq->change_mac_addr_rsp.mac_addr[0]);
4944         ether_addr_copy(adapter->mac_addr,
4945                         &crq->change_mac_addr_rsp.mac_addr[0]);
4946 out:
4947         complete(&adapter->fw_done);
4948         return rc;
4949 }
4950
4951 static void handle_request_cap_rsp(union ibmvnic_crq *crq,
4952                                    struct ibmvnic_adapter *adapter)
4953 {
4954         struct device *dev = &adapter->vdev->dev;
4955         u64 *req_value;
4956         char *name;
4957
4958         atomic_dec(&adapter->running_cap_crqs);
4959         netdev_dbg(adapter->netdev, "Outstanding request-caps: %d\n",
4960                    atomic_read(&adapter->running_cap_crqs));
4961         switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
4962         case REQ_TX_QUEUES:
4963                 req_value = &adapter->req_tx_queues;
4964                 name = "tx";
4965                 break;
4966         case REQ_RX_QUEUES:
4967                 req_value = &adapter->req_rx_queues;
4968                 name = "rx";
4969                 break;
4970         case REQ_RX_ADD_QUEUES:
4971                 req_value = &adapter->req_rx_add_queues;
4972                 name = "rx_add";
4973                 break;
4974         case REQ_TX_ENTRIES_PER_SUBCRQ:
4975                 req_value = &adapter->req_tx_entries_per_subcrq;
4976                 name = "tx_entries_per_subcrq";
4977                 break;
4978         case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
4979                 req_value = &adapter->req_rx_add_entries_per_subcrq;
4980                 name = "rx_add_entries_per_subcrq";
4981                 break;
4982         case REQ_MTU:
4983                 req_value = &adapter->req_mtu;
4984                 name = "mtu";
4985                 break;
4986         case PROMISC_REQUESTED:
4987                 req_value = &adapter->promisc;
4988                 name = "promisc";
4989                 break;
4990         default:
4991                 dev_err(dev, "Got invalid cap request rsp %d\n",
4992                         crq->request_capability.capability);
4993                 return;
4994         }
4995
4996         switch (crq->request_capability_rsp.rc.code) {
4997         case SUCCESS:
4998                 break;
4999         case PARTIALSUCCESS:
5000                 dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
5001                          *req_value,
5002                          (long)be64_to_cpu(crq->request_capability_rsp.number),
5003                          name);
5004
5005                 if (be16_to_cpu(crq->request_capability_rsp.capability) ==
5006                     REQ_MTU) {
5007                         pr_err("mtu of %llu is not supported. Reverting.\n",
5008                                *req_value);
5009                         *req_value = adapter->fallback.mtu;
5010                 } else {
5011                         *req_value =
5012                                 be64_to_cpu(crq->request_capability_rsp.number);
5013                 }
5014
5015                 send_request_cap(adapter, 1);
5016                 return;
5017         default:
5018                 dev_err(dev, "Error %d in request cap rsp\n",
5019                         crq->request_capability_rsp.rc.code);
5020                 return;
5021         }
5022
5023         /* Done receiving requested capabilities, query IP offload support */
5024         if (atomic_read(&adapter->running_cap_crqs) == 0)
5025                 send_query_ip_offload(adapter);
5026 }
5027
5028 static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
5029                             struct ibmvnic_adapter *adapter)
5030 {
5031         struct device *dev = &adapter->vdev->dev;
5032         struct net_device *netdev = adapter->netdev;
5033         struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
5034         struct ibmvnic_login_buffer *login = adapter->login_buf;
5035         u64 *tx_handle_array;
5036         u64 *rx_handle_array;
5037         int num_tx_pools;
5038         int num_rx_pools;
5039         u64 *size_array;
5040         int i;
5041
5042         /* CHECK: Test/set of login_pending does not need to be atomic
5043          * because only ibmvnic_tasklet tests/clears this.
5044          */
5045         if (!adapter->login_pending) {
5046                 netdev_warn(netdev, "Ignoring unexpected login response\n");
5047                 return 0;
5048         }
5049         adapter->login_pending = false;
5050
5051         dma_unmap_single(dev, adapter->login_buf_token, adapter->login_buf_sz,
5052                          DMA_TO_DEVICE);
5053         dma_unmap_single(dev, adapter->login_rsp_buf_token,
5054                          adapter->login_rsp_buf_sz, DMA_FROM_DEVICE);
5055
5056         /* If the number of queues requested can't be allocated by the
5057          * server, the login response will return with code 1. We will need
5058          * to resend the login buffer with fewer queues requested.
5059          */
5060         if (login_rsp_crq->generic.rc.code) {
5061                 adapter->init_done_rc = login_rsp_crq->generic.rc.code;
5062                 complete(&adapter->init_done);
5063                 return 0;
5064         }
5065
5066         if (adapter->failover_pending) {
5067                 adapter->init_done_rc = -EAGAIN;
5068                 netdev_dbg(netdev, "Failover pending, ignoring login response\n");
5069                 complete(&adapter->init_done);
5070                 /* login response buffer will be released on reset */
5071                 return 0;
5072         }
5073
5074         netdev->mtu = adapter->req_mtu - ETH_HLEN;
5075
5076         netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
5077         for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
5078                 netdev_dbg(adapter->netdev, "%016lx\n",
5079                            ((unsigned long *)(adapter->login_rsp_buf))[i]);
5080         }
5081
5082         /* Sanity checks */
5083         if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
5084             (be32_to_cpu(login->num_rxcomp_subcrqs) *
5085              adapter->req_rx_add_queues !=
5086              be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
5087                 dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
5088                 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
5089                 return -EIO;
5090         }
5091         size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
5092                 be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
5093         /* variable buffer sizes are not supported, so just read the
5094          * first entry.
5095          */
5096         adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]);
5097
5098         num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
5099         num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
5100
5101         tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
5102                                   be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
5103         rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
5104                                   be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs));
5105
5106         for (i = 0; i < num_tx_pools; i++)
5107                 adapter->tx_scrq[i]->handle = tx_handle_array[i];
5108
5109         for (i = 0; i < num_rx_pools; i++)
5110                 adapter->rx_scrq[i]->handle = rx_handle_array[i];
5111
5112         adapter->num_active_tx_scrqs = num_tx_pools;
5113         adapter->num_active_rx_scrqs = num_rx_pools;
5114         release_login_rsp_buffer(adapter);
5115         release_login_buffer(adapter);
5116         complete(&adapter->init_done);
5117
5118         return 0;
5119 }
5120
5121 static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
5122                                      struct ibmvnic_adapter *adapter)
5123 {
5124         struct device *dev = &adapter->vdev->dev;
5125         long rc;
5126
5127         rc = crq->request_unmap_rsp.rc.code;
5128         if (rc)
5129                 dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
5130 }
5131
5132 static void handle_query_map_rsp(union ibmvnic_crq *crq,
5133                                  struct ibmvnic_adapter *adapter)
5134 {
5135         struct net_device *netdev = adapter->netdev;
5136         struct device *dev = &adapter->vdev->dev;
5137         long rc;
5138
5139         rc = crq->query_map_rsp.rc.code;
5140         if (rc) {
5141                 dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
5142                 return;
5143         }
5144         netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = %u\n",
5145                    crq->query_map_rsp.page_size,
5146                    __be32_to_cpu(crq->query_map_rsp.tot_pages),
5147                    __be32_to_cpu(crq->query_map_rsp.free_pages));
5148 }
5149
5150 static void handle_query_cap_rsp(union ibmvnic_crq *crq,
5151                                  struct ibmvnic_adapter *adapter)
5152 {
5153         struct net_device *netdev = adapter->netdev;
5154         struct device *dev = &adapter->vdev->dev;
5155         long rc;
5156
5157         atomic_dec(&adapter->running_cap_crqs);
5158         netdev_dbg(netdev, "Outstanding queries: %d\n",
5159                    atomic_read(&adapter->running_cap_crqs));
5160         rc = crq->query_capability.rc.code;
5161         if (rc) {
5162                 dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
5163                 goto out;
5164         }
5165
5166         switch (be16_to_cpu(crq->query_capability.capability)) {
5167         case MIN_TX_QUEUES:
5168                 adapter->min_tx_queues =
5169                     be64_to_cpu(crq->query_capability.number);
5170                 netdev_dbg(netdev, "min_tx_queues = %lld\n",
5171                            adapter->min_tx_queues);
5172                 break;
5173         case MIN_RX_QUEUES:
5174                 adapter->min_rx_queues =
5175                     be64_to_cpu(crq->query_capability.number);
5176                 netdev_dbg(netdev, "min_rx_queues = %lld\n",
5177                            adapter->min_rx_queues);
5178                 break;
5179         case MIN_RX_ADD_QUEUES:
5180                 adapter->min_rx_add_queues =
5181                     be64_to_cpu(crq->query_capability.number);
5182                 netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
5183                            adapter->min_rx_add_queues);
5184                 break;
5185         case MAX_TX_QUEUES:
5186                 adapter->max_tx_queues =
5187                     be64_to_cpu(crq->query_capability.number);
5188                 netdev_dbg(netdev, "max_tx_queues = %lld\n",
5189                            adapter->max_tx_queues);
5190                 break;
5191         case MAX_RX_QUEUES:
5192                 adapter->max_rx_queues =
5193                     be64_to_cpu(crq->query_capability.number);
5194                 netdev_dbg(netdev, "max_rx_queues = %lld\n",
5195                            adapter->max_rx_queues);
5196                 break;
5197         case MAX_RX_ADD_QUEUES:
5198                 adapter->max_rx_add_queues =
5199                     be64_to_cpu(crq->query_capability.number);
5200                 netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
5201                            adapter->max_rx_add_queues);
5202                 break;
5203         case MIN_TX_ENTRIES_PER_SUBCRQ:
5204                 adapter->min_tx_entries_per_subcrq =
5205                     be64_to_cpu(crq->query_capability.number);
5206                 netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
5207                            adapter->min_tx_entries_per_subcrq);
5208                 break;
5209         case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
5210                 adapter->min_rx_add_entries_per_subcrq =
5211                     be64_to_cpu(crq->query_capability.number);
5212                 netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
5213                            adapter->min_rx_add_entries_per_subcrq);
5214                 break;
5215         case MAX_TX_ENTRIES_PER_SUBCRQ:
5216                 adapter->max_tx_entries_per_subcrq =
5217                     be64_to_cpu(crq->query_capability.number);
5218                 netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
5219                            adapter->max_tx_entries_per_subcrq);
5220                 break;
5221         case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
5222                 adapter->max_rx_add_entries_per_subcrq =
5223                     be64_to_cpu(crq->query_capability.number);
5224                 netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
5225                            adapter->max_rx_add_entries_per_subcrq);
5226                 break;
5227         case TCP_IP_OFFLOAD:
5228                 adapter->tcp_ip_offload =
5229                     be64_to_cpu(crq->query_capability.number);
5230                 netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
5231                            adapter->tcp_ip_offload);
5232                 break;
5233         case PROMISC_SUPPORTED:
5234                 adapter->promisc_supported =
5235                     be64_to_cpu(crq->query_capability.number);
5236                 netdev_dbg(netdev, "promisc_supported = %lld\n",
5237                            adapter->promisc_supported);
5238                 break;
5239         case MIN_MTU:
5240                 adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
5241                 netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
5242                 netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
5243                 break;
5244         case MAX_MTU:
5245                 adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
5246                 netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
5247                 netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
5248                 break;
5249         case MAX_MULTICAST_FILTERS:
5250                 adapter->max_multicast_filters =
5251                     be64_to_cpu(crq->query_capability.number);
5252                 netdev_dbg(netdev, "max_multicast_filters = %lld\n",
5253                            adapter->max_multicast_filters);
5254                 break;
5255         case VLAN_HEADER_INSERTION:
5256                 adapter->vlan_header_insertion =
5257                     be64_to_cpu(crq->query_capability.number);
5258                 if (adapter->vlan_header_insertion)
5259                         netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
5260                 netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
5261                            adapter->vlan_header_insertion);
5262                 break;
5263         case RX_VLAN_HEADER_INSERTION:
5264                 adapter->rx_vlan_header_insertion =
5265                     be64_to_cpu(crq->query_capability.number);
5266                 netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n",
5267                            adapter->rx_vlan_header_insertion);
5268                 break;
5269         case MAX_TX_SG_ENTRIES:
5270                 adapter->max_tx_sg_entries =
5271                     be64_to_cpu(crq->query_capability.number);
5272                 netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
5273                            adapter->max_tx_sg_entries);
5274                 break;
5275         case RX_SG_SUPPORTED:
5276                 adapter->rx_sg_supported =
5277                     be64_to_cpu(crq->query_capability.number);
5278                 netdev_dbg(netdev, "rx_sg_supported = %lld\n",
5279                            adapter->rx_sg_supported);
5280                 break;
5281         case OPT_TX_COMP_SUB_QUEUES:
5282                 adapter->opt_tx_comp_sub_queues =
5283                     be64_to_cpu(crq->query_capability.number);
5284                 netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
5285                            adapter->opt_tx_comp_sub_queues);
5286                 break;
5287         case OPT_RX_COMP_QUEUES:
5288                 adapter->opt_rx_comp_queues =
5289                     be64_to_cpu(crq->query_capability.number);
5290                 netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
5291                            adapter->opt_rx_comp_queues);
5292                 break;
5293         case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
5294                 adapter->opt_rx_bufadd_q_per_rx_comp_q =
5295                     be64_to_cpu(crq->query_capability.number);
5296                 netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
5297                            adapter->opt_rx_bufadd_q_per_rx_comp_q);
5298                 break;
5299         case OPT_TX_ENTRIES_PER_SUBCRQ:
5300                 adapter->opt_tx_entries_per_subcrq =
5301                     be64_to_cpu(crq->query_capability.number);
5302                 netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
5303                            adapter->opt_tx_entries_per_subcrq);
5304                 break;
5305         case OPT_RXBA_ENTRIES_PER_SUBCRQ:
5306                 adapter->opt_rxba_entries_per_subcrq =
5307                     be64_to_cpu(crq->query_capability.number);
5308                 netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
5309                            adapter->opt_rxba_entries_per_subcrq);
5310                 break;
5311         case TX_RX_DESC_REQ:
5312                 adapter->tx_rx_desc_req = crq->query_capability.number;
5313                 netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
5314                            adapter->tx_rx_desc_req);
5315                 break;
5316
5317         default:
5318                 netdev_err(netdev, "Got invalid cap rsp %d\n",
5319                            crq->query_capability.capability);
5320         }
5321
5322 out:
5323         if (atomic_read(&adapter->running_cap_crqs) == 0)
5324                 send_request_cap(adapter, 0);
5325 }
5326
5327 static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
5328 {
5329         union ibmvnic_crq crq;
5330         int rc;
5331
5332         memset(&crq, 0, sizeof(crq));
5333         crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
5334         crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;
5335
5336         mutex_lock(&adapter->fw_lock);
5337         adapter->fw_done_rc = 0;
5338         reinit_completion(&adapter->fw_done);
5339
5340         rc = ibmvnic_send_crq(adapter, &crq);
5341         if (rc) {
5342                 mutex_unlock(&adapter->fw_lock);
5343                 return rc;
5344         }
5345
5346         rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
5347         if (rc) {
5348                 mutex_unlock(&adapter->fw_lock);
5349                 return rc;
5350         }
5351
5352         mutex_unlock(&adapter->fw_lock);
5353         return adapter->fw_done_rc ? -EIO : 0;
5354 }
5355
5356 static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq,
5357                                        struct ibmvnic_adapter *adapter)
5358 {
5359         struct net_device *netdev = adapter->netdev;
5360         int rc;
5361         __be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed);
5362
5363         rc = crq->query_phys_parms_rsp.rc.code;
5364         if (rc) {
5365                 netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc);
5366                 return rc;
5367         }
5368         switch (rspeed) {
5369         case IBMVNIC_10MBPS:
5370                 adapter->speed = SPEED_10;
5371                 break;
5372         case IBMVNIC_100MBPS:
5373                 adapter->speed = SPEED_100;
5374                 break;
5375         case IBMVNIC_1GBPS:
5376                 adapter->speed = SPEED_1000;
5377                 break;
5378         case IBMVNIC_10GBPS:
5379                 adapter->speed = SPEED_10000;
5380                 break;
5381         case IBMVNIC_25GBPS:
5382                 adapter->speed = SPEED_25000;
5383                 break;
5384         case IBMVNIC_40GBPS:
5385                 adapter->speed = SPEED_40000;
5386                 break;
5387         case IBMVNIC_50GBPS:
5388                 adapter->speed = SPEED_50000;
5389                 break;
5390         case IBMVNIC_100GBPS:
5391                 adapter->speed = SPEED_100000;
5392                 break;
5393         case IBMVNIC_200GBPS:
5394                 adapter->speed = SPEED_200000;
5395                 break;
5396         default:
5397                 if (netif_carrier_ok(netdev))
5398                         netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed);
5399                 adapter->speed = SPEED_UNKNOWN;
5400         }
5401         if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX)
5402                 adapter->duplex = DUPLEX_FULL;
5403         else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX)
5404                 adapter->duplex = DUPLEX_HALF;
5405         else
5406                 adapter->duplex = DUPLEX_UNKNOWN;
5407
5408         return rc;
5409 }
5410
5411 static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
5412                                struct ibmvnic_adapter *adapter)
5413 {
5414         struct ibmvnic_generic_crq *gen_crq = &crq->generic;
5415         struct net_device *netdev = adapter->netdev;
5416         struct device *dev = &adapter->vdev->dev;
5417         u64 *u64_crq = (u64 *)crq;
5418         long rc;
5419
5420         netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
5421                    (unsigned long)cpu_to_be64(u64_crq[0]),
5422                    (unsigned long)cpu_to_be64(u64_crq[1]));
5423         switch (gen_crq->first) {
5424         case IBMVNIC_CRQ_INIT_RSP:
5425                 switch (gen_crq->cmd) {
5426                 case IBMVNIC_CRQ_INIT:
5427                         dev_info(dev, "Partner initialized\n");
5428                         adapter->from_passive_init = true;
5429                         /* Discard any stale login responses from prev reset.
5430                          * CHECK: should we clear even on INIT_COMPLETE?
5431                          */
5432                         adapter->login_pending = false;
5433
5434                         if (adapter->state == VNIC_DOWN)
5435                                 rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT);
5436                         else
5437                                 rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
5438
5439                         if (rc && rc != -EBUSY) {
5440                                 /* We were unable to schedule the failover
5441                                  * reset either because the adapter was still
5442                                  * probing (eg: during kexec) or we could not
5443                                  * allocate memory. Clear the failover_pending
5444                                  * flag since no one else will. We ignore
5445                                  * EBUSY because it means either FAILOVER reset
5446                                  * is already scheduled or the adapter is
5447                                  * being removed.
5448                                  */
5449                                 netdev_err(netdev,
5450                                            "Error %ld scheduling failover reset\n",
5451                                            rc);
5452                                 adapter->failover_pending = false;
5453                         }
5454
5455                         if (!completion_done(&adapter->init_done)) {
5456                                 if (!adapter->init_done_rc)
5457                                         adapter->init_done_rc = -EAGAIN;
5458                                 complete(&adapter->init_done);
5459                         }
5460
5461                         break;
5462                 case IBMVNIC_CRQ_INIT_COMPLETE:
5463                         dev_info(dev, "Partner initialization complete\n");
5464                         adapter->crq.active = true;
5465                         send_version_xchg(adapter);
5466                         break;
5467                 default:
5468                         dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd);
5469                 }
5470                 return;
5471         case IBMVNIC_CRQ_XPORT_EVENT:
5472                 netif_carrier_off(netdev);
5473                 adapter->crq.active = false;
5474                 /* terminate any thread waiting for a response
5475                  * from the device
5476                  */
5477                 if (!completion_done(&adapter->fw_done)) {
5478                         adapter->fw_done_rc = -EIO;
5479                         complete(&adapter->fw_done);
5480                 }
5481
5482                 /* if we got here during crq-init, retry crq-init */
5483                 if (!completion_done(&adapter->init_done)) {
5484                         adapter->init_done_rc = -EAGAIN;
5485                         complete(&adapter->init_done);
5486                 }
5487
5488                 if (!completion_done(&adapter->stats_done))
5489                         complete(&adapter->stats_done);
5490                 if (test_bit(0, &adapter->resetting))
5491                         adapter->force_reset_recovery = true;
5492                 if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
5493                         dev_info(dev, "Migrated, re-enabling adapter\n");
5494                         ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
5495                 } else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
5496                         dev_info(dev, "Backing device failover detected\n");
5497                         adapter->failover_pending = true;
5498                 } else {
5499                         /* The adapter lost the connection */
5500                         dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
5501                                 gen_crq->cmd);
5502                         ibmvnic_reset(adapter, VNIC_RESET_FATAL);
5503                 }
5504                 return;
5505         case IBMVNIC_CRQ_CMD_RSP:
5506                 break;
5507         default:
5508                 dev_err(dev, "Got an invalid msg type 0x%02x\n",
5509                         gen_crq->first);
5510                 return;
5511         }
5512
5513         switch (gen_crq->cmd) {
5514         case VERSION_EXCHANGE_RSP:
5515                 rc = crq->version_exchange_rsp.rc.code;
5516                 if (rc) {
5517                         dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc);
5518                         break;
5519                 }
5520                 ibmvnic_version =
5521                             be16_to_cpu(crq->version_exchange_rsp.version);
5522                 dev_info(dev, "Partner protocol version is %d\n",
5523                          ibmvnic_version);
5524                 send_query_cap(adapter);
5525                 break;
5526         case QUERY_CAPABILITY_RSP:
5527                 handle_query_cap_rsp(crq, adapter);
5528                 break;
5529         case QUERY_MAP_RSP:
5530                 handle_query_map_rsp(crq, adapter);
5531                 break;
5532         case REQUEST_MAP_RSP:
5533                 adapter->fw_done_rc = crq->request_map_rsp.rc.code;
5534                 complete(&adapter->fw_done);
5535                 break;
5536         case REQUEST_UNMAP_RSP:
5537                 handle_request_unmap_rsp(crq, adapter);
5538                 break;
5539         case REQUEST_CAPABILITY_RSP:
5540                 handle_request_cap_rsp(crq, adapter);
5541                 break;
5542         case LOGIN_RSP:
5543                 netdev_dbg(netdev, "Got Login Response\n");
5544                 handle_login_rsp(crq, adapter);
5545                 break;
5546         case LOGICAL_LINK_STATE_RSP:
5547                 netdev_dbg(netdev,
5548                            "Got Logical Link State Response, state: %d rc: %d\n",
5549                            crq->logical_link_state_rsp.link_state,
5550                            crq->logical_link_state_rsp.rc.code);
5551                 adapter->logical_link_state =
5552                     crq->logical_link_state_rsp.link_state;
5553                 adapter->init_done_rc = crq->logical_link_state_rsp.rc.code;
5554                 complete(&adapter->init_done);
5555                 break;
5556         case LINK_STATE_INDICATION:
5557                 netdev_dbg(netdev, "Got Logical Link State Indication\n");
5558                 adapter->phys_link_state =
5559                     crq->link_state_indication.phys_link_state;
5560                 adapter->logical_link_state =
5561                     crq->link_state_indication.logical_link_state;
5562                 if (adapter->phys_link_state && adapter->logical_link_state)
5563                         netif_carrier_on(netdev);
5564                 else
5565                         netif_carrier_off(netdev);
5566                 break;
5567         case CHANGE_MAC_ADDR_RSP:
5568                 netdev_dbg(netdev, "Got MAC address change Response\n");
5569                 adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter);
5570                 break;
5571         case ERROR_INDICATION:
5572                 netdev_dbg(netdev, "Got Error Indication\n");
5573                 handle_error_indication(crq, adapter);
5574                 break;
5575         case REQUEST_STATISTICS_RSP:
5576                 netdev_dbg(netdev, "Got Statistics Response\n");
5577                 complete(&adapter->stats_done);
5578                 break;
5579         case QUERY_IP_OFFLOAD_RSP:
5580                 netdev_dbg(netdev, "Got Query IP offload Response\n");
5581                 handle_query_ip_offload_rsp(adapter);
5582                 break;
5583         case MULTICAST_CTRL_RSP:
5584                 netdev_dbg(netdev, "Got multicast control Response\n");
5585                 break;
5586         case CONTROL_IP_OFFLOAD_RSP:
5587                 netdev_dbg(netdev, "Got Control IP offload Response\n");
5588                 dma_unmap_single(dev, adapter->ip_offload_ctrl_tok,
5589                                  sizeof(adapter->ip_offload_ctrl),
5590                                  DMA_TO_DEVICE);
5591                 complete(&adapter->init_done);
5592                 break;
5593         case COLLECT_FW_TRACE_RSP:
5594                 netdev_dbg(netdev, "Got Collect firmware trace Response\n");
5595                 complete(&adapter->fw_done);
5596                 break;
5597         case GET_VPD_SIZE_RSP:
5598                 handle_vpd_size_rsp(crq, adapter);
5599                 break;
5600         case GET_VPD_RSP:
5601                 handle_vpd_rsp(crq, adapter);
5602                 break;
5603         case QUERY_PHYS_PARMS_RSP:
5604                 adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter);
5605                 complete(&adapter->fw_done);
5606                 break;
5607         default:
5608                 netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
5609                            gen_crq->cmd);
5610         }
5611 }
5612
5613 static irqreturn_t ibmvnic_interrupt(int irq, void *instance)
5614 {
5615         struct ibmvnic_adapter *adapter = instance;
5616
5617         tasklet_schedule(&adapter->tasklet);
5618         return IRQ_HANDLED;
5619 }
5620
5621 static void ibmvnic_tasklet(struct tasklet_struct *t)
5622 {
5623         struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet);
5624         struct ibmvnic_crq_queue *queue = &adapter->crq;
5625         union ibmvnic_crq *crq;
5626         unsigned long flags;
5627
5628         spin_lock_irqsave(&queue->lock, flags);
5629
5630         /* Pull all the valid messages off the CRQ */
5631         while ((crq = ibmvnic_next_crq(adapter)) != NULL) {
5632                 /* This barrier makes sure ibmvnic_next_crq()'s
5633                  * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded
5634                  * before ibmvnic_handle_crq()'s
5635                  * switch(gen_crq->first) and switch(gen_crq->cmd).
5636                  */
5637                 dma_rmb();
5638                 ibmvnic_handle_crq(crq, adapter);
5639                 crq->generic.first = 0;
5640         }
5641
5642         spin_unlock_irqrestore(&queue->lock, flags);
5643 }
5644
5645 static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter)
5646 {
5647         struct vio_dev *vdev = adapter->vdev;
5648         int rc;
5649
5650         do {
5651                 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
5652         } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
5653
5654         if (rc)
5655                 dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc);
5656
5657         return rc;
5658 }
5659
5660 static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
5661 {
5662         struct ibmvnic_crq_queue *crq = &adapter->crq;
5663         struct device *dev = &adapter->vdev->dev;
5664         struct vio_dev *vdev = adapter->vdev;
5665         int rc;
5666
5667         /* Close the CRQ */
5668         do {
5669                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5670         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5671
5672         /* Clean out the queue */
5673         if (!crq->msgs)
5674                 return -EINVAL;
5675
5676         memset(crq->msgs, 0, PAGE_SIZE);
5677         crq->cur = 0;
5678         crq->active = false;
5679
5680         /* And re-open it again */
5681         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5682                                 crq->msg_token, PAGE_SIZE);
5683
5684         if (rc == H_CLOSED)
5685                 /* Adapter is good, but other end is not ready */
5686                 dev_warn(dev, "Partner adapter not ready\n");
5687         else if (rc != 0)
5688                 dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);
5689
5690         return rc;
5691 }
5692
5693 static void release_crq_queue(struct ibmvnic_adapter *adapter)
5694 {
5695         struct ibmvnic_crq_queue *crq = &adapter->crq;
5696         struct vio_dev *vdev = adapter->vdev;
5697         long rc;
5698
5699         if (!crq->msgs)
5700                 return;
5701
5702         netdev_dbg(adapter->netdev, "Releasing CRQ\n");
5703         free_irq(vdev->irq, adapter);
5704         tasklet_kill(&adapter->tasklet);
5705         do {
5706                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5707         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5708
5709         dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE,
5710                          DMA_BIDIRECTIONAL);
5711         free_page((unsigned long)crq->msgs);
5712         crq->msgs = NULL;
5713         crq->active = false;
5714 }
5715
5716 static int init_crq_queue(struct ibmvnic_adapter *adapter)
5717 {
5718         struct ibmvnic_crq_queue *crq = &adapter->crq;
5719         struct device *dev = &adapter->vdev->dev;
5720         struct vio_dev *vdev = adapter->vdev;
5721         int rc, retrc = -ENOMEM;
5722
5723         if (crq->msgs)
5724                 return 0;
5725
5726         crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL);
5727         /* Should we allocate more than one page? */
5728
5729         if (!crq->msgs)
5730                 return -ENOMEM;
5731
5732         crq->size = PAGE_SIZE / sizeof(*crq->msgs);
5733         crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE,
5734                                         DMA_BIDIRECTIONAL);
5735         if (dma_mapping_error(dev, crq->msg_token))
5736                 goto map_failed;
5737
5738         rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5739                                 crq->msg_token, PAGE_SIZE);
5740
5741         if (rc == H_RESOURCE)
5742                 /* maybe kexecing and resource is busy. try a reset */
5743                 rc = ibmvnic_reset_crq(adapter);
5744         retrc = rc;
5745
5746         if (rc == H_CLOSED) {
5747                 dev_warn(dev, "Partner adapter not ready\n");
5748         } else if (rc) {
5749                 dev_warn(dev, "Error %d opening adapter\n", rc);
5750                 goto reg_crq_failed;
5751         }
5752
5753         retrc = 0;
5754
5755         tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet);
5756
5757         netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
5758         snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
5759                  adapter->vdev->unit_address);
5760         rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
5761         if (rc) {
5762                 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
5763                         vdev->irq, rc);
5764                 goto req_irq_failed;
5765         }
5766
5767         rc = vio_enable_interrupts(vdev);
5768         if (rc) {
5769                 dev_err(dev, "Error %d enabling interrupts\n", rc);
5770                 goto req_irq_failed;
5771         }
5772
5773         crq->cur = 0;
5774         spin_lock_init(&crq->lock);
5775
5776         /* process any CRQs that were queued before we enabled interrupts */
5777         tasklet_schedule(&adapter->tasklet);
5778
5779         return retrc;
5780
5781 req_irq_failed:
5782         tasklet_kill(&adapter->tasklet);
5783         do {
5784                 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5785         } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5786 reg_crq_failed:
5787         dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
5788 map_failed:
5789         free_page((unsigned long)crq->msgs);
5790         crq->msgs = NULL;
5791         return retrc;
5792 }
5793
5794 static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
5795 {
5796         struct device *dev = &adapter->vdev->dev;
5797         unsigned long timeout = msecs_to_jiffies(20000);
5798         u64 old_num_rx_queues = adapter->req_rx_queues;
5799         u64 old_num_tx_queues = adapter->req_tx_queues;
5800         int rc;
5801
5802         adapter->from_passive_init = false;
5803
5804         rc = ibmvnic_send_crq_init(adapter);
5805         if (rc) {
5806                 dev_err(dev, "Send crq init failed with error %d\n", rc);
5807                 return rc;
5808         }
5809
5810         if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
5811                 dev_err(dev, "Initialization sequence timed out\n");
5812                 return -ETIMEDOUT;
5813         }
5814
5815         if (adapter->init_done_rc) {
5816                 release_crq_queue(adapter);
5817                 dev_err(dev, "CRQ-init failed, %d\n", adapter->init_done_rc);
5818                 return adapter->init_done_rc;
5819         }
5820
5821         if (adapter->from_passive_init) {
5822                 adapter->state = VNIC_OPEN;
5823                 adapter->from_passive_init = false;
5824                 dev_err(dev, "CRQ-init failed, passive-init\n");
5825                 return -EINVAL;
5826         }
5827
5828         if (reset &&
5829             test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
5830             adapter->reset_reason != VNIC_RESET_MOBILITY) {
5831                 if (adapter->req_rx_queues != old_num_rx_queues ||
5832                     adapter->req_tx_queues != old_num_tx_queues) {
5833                         release_sub_crqs(adapter, 0);
5834                         rc = init_sub_crqs(adapter);
5835                 } else {
5836                         rc = reset_sub_crq_queues(adapter);
5837                 }
5838         } else {
5839                 rc = init_sub_crqs(adapter);
5840         }
5841
5842         if (rc) {
5843                 dev_err(dev, "Initialization of sub crqs failed\n");
5844                 release_crq_queue(adapter);
5845                 return rc;
5846         }
5847
5848         rc = init_sub_crq_irqs(adapter);
5849         if (rc) {
5850                 dev_err(dev, "Failed to initialize sub crq irqs\n");
5851                 release_crq_queue(adapter);
5852         }
5853
5854         return rc;
5855 }
5856
5857 static struct device_attribute dev_attr_failover;
5858
5859 static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
5860 {
5861         struct ibmvnic_adapter *adapter;
5862         struct net_device *netdev;
5863         unsigned char *mac_addr_p;
5864         unsigned long flags;
5865         bool init_success;
5866         int rc;
5867
5868         dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",
5869                 dev->unit_address);
5870
5871         mac_addr_p = (unsigned char *)vio_get_attribute(dev,
5872                                                         VETH_MAC_ADDR, NULL);
5873         if (!mac_addr_p) {
5874                 dev_err(&dev->dev,
5875                         "(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n",
5876                         __FILE__, __LINE__);
5877                 return 0;
5878         }
5879
5880         netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter),
5881                                    IBMVNIC_MAX_QUEUES);
5882         if (!netdev)
5883                 return -ENOMEM;
5884
5885         adapter = netdev_priv(netdev);
5886         adapter->state = VNIC_PROBING;
5887         dev_set_drvdata(&dev->dev, netdev);
5888         adapter->vdev = dev;
5889         adapter->netdev = netdev;
5890         adapter->login_pending = false;
5891         memset(&adapter->map_ids, 0, sizeof(adapter->map_ids));
5892         /* map_ids start at 1, so ensure map_id 0 is always "in-use" */
5893         bitmap_set(adapter->map_ids, 0, 1);
5894
5895         ether_addr_copy(adapter->mac_addr, mac_addr_p);
5896         eth_hw_addr_set(netdev, adapter->mac_addr);
5897         netdev->irq = dev->irq;
5898         netdev->netdev_ops = &ibmvnic_netdev_ops;
5899         netdev->ethtool_ops = &ibmvnic_ethtool_ops;
5900         SET_NETDEV_DEV(netdev, &dev->dev);
5901
5902         INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
5903         INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
5904                           __ibmvnic_delayed_reset);
5905         INIT_LIST_HEAD(&adapter->rwi_list);
5906         spin_lock_init(&adapter->rwi_lock);
5907         spin_lock_init(&adapter->state_lock);
5908         mutex_init(&adapter->fw_lock);
5909         init_completion(&adapter->probe_done);
5910         init_completion(&adapter->init_done);
5911         init_completion(&adapter->fw_done);
5912         init_completion(&adapter->reset_done);
5913         init_completion(&adapter->stats_done);
5914         clear_bit(0, &adapter->resetting);
5915         adapter->prev_rx_buf_sz = 0;
5916         adapter->prev_mtu = 0;
5917
5918         init_success = false;
5919         do {
5920                 reinit_init_done(adapter);
5921
5922                 /* clear any failovers we got in the previous pass
5923                  * since we are reinitializing the CRQ
5924                  */
5925                 adapter->failover_pending = false;
5926
5927                 /* If we had already initialized CRQ, we may have one or
5928                  * more resets queued already. Discard those and release
5929                  * the CRQ before initializing the CRQ again.
5930                  */
5931                 release_crq_queue(adapter);
5932
5933                 /* Since we are still in PROBING state, __ibmvnic_reset()
5934                  * will not access the ->rwi_list and since we released CRQ,
5935                  * we won't get _new_ transport events. But there maybe an
5936                  * ongoing ibmvnic_reset() call. So serialize access to
5937                  * rwi_list. If we win the race, ibvmnic_reset() could add
5938                  * a reset after we purged but thats ok - we just may end
5939                  * up with an extra reset (i.e similar to having two or more
5940                  * resets in the queue at once).
5941                  * CHECK.
5942                  */
5943                 spin_lock_irqsave(&adapter->rwi_lock, flags);
5944                 flush_reset_queue(adapter);
5945                 spin_unlock_irqrestore(&adapter->rwi_lock, flags);
5946
5947                 rc = init_crq_queue(adapter);
5948                 if (rc) {
5949                         dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
5950                                 rc);
5951                         goto ibmvnic_init_fail;
5952                 }
5953
5954                 rc = ibmvnic_reset_init(adapter, false);
5955         } while (rc == -EAGAIN);
5956
5957         /* We are ignoring the error from ibmvnic_reset_init() assuming that the
5958          * partner is not ready. CRQ is not active. When the partner becomes
5959          * ready, we will do the passive init reset.
5960          */
5961
5962         if (!rc)
5963                 init_success = true;
5964
5965         rc = init_stats_buffers(adapter);
5966         if (rc)
5967                 goto ibmvnic_init_fail;
5968
5969         rc = init_stats_token(adapter);
5970         if (rc)
5971                 goto ibmvnic_stats_fail;
5972
5973         rc = device_create_file(&dev->dev, &dev_attr_failover);
5974         if (rc)
5975                 goto ibmvnic_dev_file_err;
5976
5977         netif_carrier_off(netdev);
5978
5979         if (init_success) {
5980                 adapter->state = VNIC_PROBED;
5981                 netdev->mtu = adapter->req_mtu - ETH_HLEN;
5982                 netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
5983                 netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
5984         } else {
5985                 adapter->state = VNIC_DOWN;
5986         }
5987
5988         adapter->wait_for_reset = false;
5989         adapter->last_reset_time = jiffies;
5990
5991         rc = register_netdev(netdev);
5992         if (rc) {
5993                 dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc);
5994                 goto ibmvnic_register_fail;
5995         }
5996         dev_info(&dev->dev, "ibmvnic registered\n");
5997
5998         complete(&adapter->probe_done);
5999
6000         return 0;
6001
6002 ibmvnic_register_fail:
6003         device_remove_file(&dev->dev, &dev_attr_failover);
6004
6005 ibmvnic_dev_file_err:
6006         release_stats_token(adapter);
6007
6008 ibmvnic_stats_fail:
6009         release_stats_buffers(adapter);
6010
6011 ibmvnic_init_fail:
6012         release_sub_crqs(adapter, 1);
6013         release_crq_queue(adapter);
6014
6015         /* cleanup worker thread after releasing CRQ so we don't get
6016          * transport events (i.e new work items for the worker thread).
6017          */
6018         adapter->state = VNIC_REMOVING;
6019         complete(&adapter->probe_done);
6020         flush_work(&adapter->ibmvnic_reset);
6021         flush_delayed_work(&adapter->ibmvnic_delayed_reset);
6022
6023         flush_reset_queue(adapter);
6024
6025         mutex_destroy(&adapter->fw_lock);
6026         free_netdev(netdev);
6027
6028         return rc;
6029 }
6030
6031 static void ibmvnic_remove(struct vio_dev *dev)
6032 {
6033         struct net_device *netdev = dev_get_drvdata(&dev->dev);
6034         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
6035         unsigned long flags;
6036
6037         spin_lock_irqsave(&adapter->state_lock, flags);
6038
6039         /* If ibmvnic_reset() is scheduling a reset, wait for it to
6040          * finish. Then, set the state to REMOVING to prevent it from
6041          * scheduling any more work and to have reset functions ignore
6042          * any resets that have already been scheduled. Drop the lock
6043          * after setting state, so __ibmvnic_reset() which is called
6044          * from the flush_work() below, can make progress.
6045          */
6046         spin_lock(&adapter->rwi_lock);
6047         adapter->state = VNIC_REMOVING;
6048         spin_unlock(&adapter->rwi_lock);
6049
6050         spin_unlock_irqrestore(&adapter->state_lock, flags);
6051
6052         flush_work(&adapter->ibmvnic_reset);
6053         flush_delayed_work(&adapter->ibmvnic_delayed_reset);
6054
6055         rtnl_lock();
6056         unregister_netdevice(netdev);
6057
6058         release_resources(adapter);
6059         release_rx_pools(adapter);
6060         release_tx_pools(adapter);
6061         release_sub_crqs(adapter, 1);
6062         release_crq_queue(adapter);
6063
6064         release_stats_token(adapter);
6065         release_stats_buffers(adapter);
6066
6067         adapter->state = VNIC_REMOVED;
6068
6069         rtnl_unlock();
6070         mutex_destroy(&adapter->fw_lock);
6071         device_remove_file(&dev->dev, &dev_attr_failover);
6072         free_netdev(netdev);
6073         dev_set_drvdata(&dev->dev, NULL);
6074 }
6075
6076 static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
6077                               const char *buf, size_t count)
6078 {
6079         struct net_device *netdev = dev_get_drvdata(dev);
6080         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
6081         unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
6082         __be64 session_token;
6083         long rc;
6084
6085         if (!sysfs_streq(buf, "1"))
6086                 return -EINVAL;
6087
6088         rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address,
6089                          H_GET_SESSION_TOKEN, 0, 0, 0);
6090         if (rc) {
6091                 netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n",
6092                            rc);
6093                 goto last_resort;
6094         }
6095
6096         session_token = (__be64)retbuf[0];
6097         netdev_dbg(netdev, "Initiating client failover, session id %llx\n",
6098                    be64_to_cpu(session_token));
6099         rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
6100                                 H_SESSION_ERR_DETECTED, session_token, 0, 0);
6101         if (rc) {
6102                 netdev_err(netdev,
6103                            "H_VIOCTL initiated failover failed, rc %ld\n",
6104                            rc);
6105                 goto last_resort;
6106         }
6107
6108         return count;
6109
6110 last_resort:
6111         netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n");
6112         ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
6113
6114         return count;
6115 }
6116 static DEVICE_ATTR_WO(failover);
6117
6118 static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
6119 {
6120         struct net_device *netdev = dev_get_drvdata(&vdev->dev);
6121         struct ibmvnic_adapter *adapter;
6122         struct iommu_table *tbl;
6123         unsigned long ret = 0;
6124         int i;
6125
6126         tbl = get_iommu_table_base(&vdev->dev);
6127
6128         /* netdev inits at probe time along with the structures we need below*/
6129         if (!netdev)
6130                 return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl);
6131
6132         adapter = netdev_priv(netdev);
6133
6134         ret += PAGE_SIZE; /* the crq message queue */
6135         ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl);
6136
6137         for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++)
6138                 ret += 4 * PAGE_SIZE; /* the scrq message queue */
6139
6140         for (i = 0; i < adapter->num_active_rx_pools; i++)
6141                 ret += adapter->rx_pool[i].size *
6142                     IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl);
6143
6144         return ret;
6145 }
6146
6147 static int ibmvnic_resume(struct device *dev)
6148 {
6149         struct net_device *netdev = dev_get_drvdata(dev);
6150         struct ibmvnic_adapter *adapter = netdev_priv(netdev);
6151
6152         if (adapter->state != VNIC_OPEN)
6153                 return 0;
6154
6155         tasklet_schedule(&adapter->tasklet);
6156
6157         return 0;
6158 }
6159
6160 static const struct vio_device_id ibmvnic_device_table[] = {
6161         {"network", "IBM,vnic"},
6162         {"", "" }
6163 };
6164 MODULE_DEVICE_TABLE(vio, ibmvnic_device_table);
6165
6166 static const struct dev_pm_ops ibmvnic_pm_ops = {
6167         .resume = ibmvnic_resume
6168 };
6169
6170 static struct vio_driver ibmvnic_driver = {
6171         .id_table       = ibmvnic_device_table,
6172         .probe          = ibmvnic_probe,
6173         .remove         = ibmvnic_remove,
6174         .get_desired_dma = ibmvnic_get_desired_dma,
6175         .name           = ibmvnic_driver_name,
6176         .pm             = &ibmvnic_pm_ops,
6177 };
6178
6179 /* module functions */
6180 static int __init ibmvnic_module_init(void)
6181 {
6182         pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string,
6183                 IBMVNIC_DRIVER_VERSION);
6184
6185         return vio_register_driver(&ibmvnic_driver);
6186 }
6187
6188 static void __exit ibmvnic_module_exit(void)
6189 {
6190         vio_unregister_driver(&ibmvnic_driver);
6191 }
6192
6193 module_init(ibmvnic_module_init);
6194 module_exit(ibmvnic_module_exit);