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