drivers/net/ethernet/cavium/liquidio/octeon_droq.c

   1 /**********************************************************************
   2  * Author: Cavium, Inc.
   3  *
   4  * Contact: support@cavium.com
   5  *          Please include "LiquidIO" in the subject.
   6  *
   7  * Copyright (c) 2003-2016 Cavium, Inc.
   8  *
   9  * This file is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License, Version 2, as
  11  * published by the Free Software Foundation.
  12  *
  13  * This file is distributed in the hope that it will be useful, but
  14  * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
  15  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
  16  * NONINFRINGEMENT.  See the GNU General Public License for more details.
  17  ***********************************************************************/
  18 #include <linux/pci.h>
  19 #include <linux/netdevice.h>
  20 #include <linux/vmalloc.h>
  21 #include "liquidio_common.h"
  22 #include "octeon_droq.h"
  23 #include "octeon_iq.h"
  24 #include "response_manager.h"
  25 #include "octeon_device.h"
  26 #include "octeon_main.h"
  27 #include "octeon_network.h"
  28 #include "cn66xx_regs.h"
  29 #include "cn66xx_device.h"
  30 #include "cn23xx_pf_device.h"
  31 #include "cn23xx_vf_device.h"
  32
  33 struct niclist {
  34         struct list_head list;
  35         void *ptr;
  36 };
  37
  38 struct __dispatch {
  39         struct list_head list;
  40         struct octeon_recv_info *rinfo;
  41         octeon_dispatch_fn_t disp_fn;
  42 };
  43
  44 /** Get the argument that the user set when registering dispatch
  45  *  function for a given opcode/subcode.
  46  *  @param  octeon_dev - the octeon device pointer.
  47  *  @param  opcode     - the opcode for which the dispatch argument
  48  *                       is to be checked.
  49  *  @param  subcode    - the subcode for which the dispatch argument
  50  *                       is to be checked.
  51  *  @return  Success: void * (argument to the dispatch function)
  52  *  @return  Failure: NULL
  53  *
  54  */
  55 void *octeon_get_dispatch_arg(struct octeon_device *octeon_dev,
  56                               u16 opcode, u16 subcode)
  57 {
  58         int idx;
  59         struct list_head *dispatch;
  60         void *fn_arg = NULL;
  61         u16 combined_opcode = OPCODE_SUBCODE(opcode, subcode);
  62
  63         idx = combined_opcode & OCTEON_OPCODE_MASK;
  64
  65         spin_lock_bh(&octeon_dev->dispatch.lock);
  66
  67         if (octeon_dev->dispatch.count == 0) {
  68                 spin_unlock_bh(&octeon_dev->dispatch.lock);
  69                 return NULL;
  70         }
  71
  72         if (octeon_dev->dispatch.dlist[idx].opcode == combined_opcode) {
  73                 fn_arg = octeon_dev->dispatch.dlist[idx].arg;
  74         } else {
  75                 list_for_each(dispatch,
  76                               &octeon_dev->dispatch.dlist[idx].list) {
  77                         if (((struct octeon_dispatch *)dispatch)->opcode ==
  78                             combined_opcode) {
  79                                 fn_arg = ((struct octeon_dispatch *)
  80                                           dispatch)->arg;
  81                                 break;
  82                         }
  83                 }
  84         }
  85
  86         spin_unlock_bh(&octeon_dev->dispatch.lock);
  87         return fn_arg;
  88 }
  89
  90 /** Check for packets on Droq. This function should be called with lock held.
  91  *  @param  droq - Droq on which count is checked.
  92  *  @return Returns packet count.
  93  */
  94 u32 octeon_droq_check_hw_for_pkts(struct octeon_droq *droq)
  95 {
  96         u32 pkt_count = 0;
  97         u32 last_count;
  98
  99         pkt_count = readl(droq->pkts_sent_reg);
 100
 101         last_count = pkt_count - droq->pkt_count;
 102         droq->pkt_count = pkt_count;
 103
 104         /* we shall write to cnts  at napi irq enable or end of droq tasklet */
 105         if (last_count)
 106                 atomic_add(last_count, &droq->pkts_pending);
 107
 108         return last_count;
 109 }
 110
 111 static void octeon_droq_compute_max_packet_bufs(struct octeon_droq *droq)
 112 {
 113         u32 count = 0;
 114
 115         /* max_empty_descs is the max. no. of descs that can have no buffers.
 116          * If the empty desc count goes beyond this value, we cannot safely
 117          * read in a 64K packet sent by Octeon
 118          * (64K is max pkt size from Octeon)
 119          */
 120         droq->max_empty_descs = 0;
 121
 122         do {
 123                 droq->max_empty_descs++;
 124                 count += droq->buffer_size;
 125         } while (count < (64 * 1024));
 126
 127         droq->max_empty_descs = droq->max_count - droq->max_empty_descs;
 128 }
 129
 130 static void octeon_droq_reset_indices(struct octeon_droq *droq)
 131 {
 132         droq->read_idx = 0;
 133         droq->write_idx = 0;
 134         droq->refill_idx = 0;
 135         droq->refill_count = 0;
 136         atomic_set(&droq->pkts_pending, 0);
 137 }
 138
 139 static void
 140 octeon_droq_destroy_ring_buffers(struct octeon_device *oct,
 141                                  struct octeon_droq *droq)
 142 {
 143         u32 i;
 144         struct octeon_skb_page_info *pg_info;
 145
 146         for (i = 0; i < droq->max_count; i++) {
 147                 pg_info = &droq->recv_buf_list[i].pg_info;
 148                 if (!pg_info)
 149                         continue;
 150
 151                 if (pg_info->dma)
 152                         lio_unmap_ring(oct->pci_dev,
 153                                        (u64)pg_info->dma);
 154                 pg_info->dma = 0;
 155
 156                 if (pg_info->page)
 157                         recv_buffer_destroy(droq->recv_buf_list[i].buffer,
 158                                             pg_info);
 159
 160                 droq->recv_buf_list[i].buffer = NULL;
 161         }
 162
 163         octeon_droq_reset_indices(droq);
 164 }
 165
 166 static int
 167 octeon_droq_setup_ring_buffers(struct octeon_device *oct,
 168                                struct octeon_droq *droq)
 169 {
 170         u32 i;
 171         void *buf;
 172         struct octeon_droq_desc *desc_ring = droq->desc_ring;
 173
 174         for (i = 0; i < droq->max_count; i++) {
 175                 buf = recv_buffer_alloc(oct, &droq->recv_buf_list[i].pg_info);
 176
 177                 if (!buf) {
 178                         dev_err(&oct->pci_dev->dev, "%s buffer alloc failed\n",
 179                                 __func__);
 180                         droq->stats.rx_alloc_failure++;
 181                         return -ENOMEM;
 182                 }
 183
 184                 droq->recv_buf_list[i].buffer = buf;
 185                 droq->recv_buf_list[i].data = get_rbd(buf);
 186                 desc_ring[i].info_ptr = 0;
 187                 desc_ring[i].buffer_ptr =
 188                         lio_map_ring(droq->recv_buf_list[i].buffer);
 189         }
 190
 191         octeon_droq_reset_indices(droq);
 192
 193         octeon_droq_compute_max_packet_bufs(droq);
 194
 195         return 0;
 196 }
 197
 198 int octeon_delete_droq(struct octeon_device *oct, u32 q_no)
 199 {
 200         struct octeon_droq *droq = oct->droq[q_no];
 201
 202         dev_dbg(&oct->pci_dev->dev, "%s[%d]\n", __func__, q_no);
 203
 204         octeon_droq_destroy_ring_buffers(oct, droq);
 205         vfree(droq->recv_buf_list);
 206
 207         if (droq->desc_ring)
 208                 lio_dma_free(oct, (droq->max_count * OCT_DROQ_DESC_SIZE),
 209                              droq->desc_ring, droq->desc_ring_dma);
 210
 211         memset(droq, 0, OCT_DROQ_SIZE);
 212         oct->io_qmask.oq &= ~(1ULL << q_no);
 213         vfree(oct->droq[q_no]);
 214         oct->droq[q_no] = NULL;
 215         oct->num_oqs--;
 216
 217         return 0;
 218 }
 219
 220 int octeon_init_droq(struct octeon_device *oct,
 221                      u32 q_no,
 222                      u32 num_descs,
 223                      u32 desc_size,
 224                      void *app_ctx)
 225 {
 226         struct octeon_droq *droq;
 227         u32 desc_ring_size = 0, c_num_descs = 0, c_buf_size = 0;
 228         u32 c_pkts_per_intr = 0, c_refill_threshold = 0;
 229         int numa_node = dev_to_node(&oct->pci_dev->dev);
 230
 231         dev_dbg(&oct->pci_dev->dev, "%s[%d]\n", __func__, q_no);
 232
 233         droq = oct->droq[q_no];
 234         memset(droq, 0, OCT_DROQ_SIZE);
 235
 236         droq->oct_dev = oct;
 237         droq->q_no = q_no;
 238         if (app_ctx)
 239                 droq->app_ctx = app_ctx;
 240         else
 241                 droq->app_ctx = (void *)(size_t)q_no;
 242
 243         c_num_descs = num_descs;
 244         c_buf_size = desc_size;
 245         if (OCTEON_CN6XXX(oct)) {
 246                 struct octeon_config *conf6x = CHIP_CONF(oct, cn6xxx);
 247
 248                 c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf6x);
 249                 c_refill_threshold =
 250                         (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf6x);
 251         } else if (OCTEON_CN23XX_PF(oct)) {
 252                 struct octeon_config *conf23 = CHIP_CONF(oct, cn23xx_pf);
 253
 254                 c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf23);
 255                 c_refill_threshold = (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf23);
 256         } else if (OCTEON_CN23XX_VF(oct)) {
 257                 struct octeon_config *conf23 = CHIP_CONF(oct, cn23xx_vf);
 258
 259                 c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf23);
 260                 c_refill_threshold = (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf23);
 261         } else {
 262                 return 1;
 263         }
 264
 265         droq->max_count = c_num_descs;
 266         droq->buffer_size = c_buf_size;
 267
 268         desc_ring_size = droq->max_count * OCT_DROQ_DESC_SIZE;
 269         droq->desc_ring = lio_dma_alloc(oct, desc_ring_size,
 270                                         (dma_addr_t *)&droq->desc_ring_dma);
 271
 272         if (!droq->desc_ring) {
 273                 dev_err(&oct->pci_dev->dev,
 274                         "Output queue %d ring alloc failed\n", q_no);
 275                 return 1;
 276         }
 277
 278         dev_dbg(&oct->pci_dev->dev, "droq[%d]: desc_ring: virt: 0x%p, dma: %lx\n",
 279                 q_no, droq->desc_ring, droq->desc_ring_dma);
 280         dev_dbg(&oct->pci_dev->dev, "droq[%d]: num_desc: %d\n", q_no,
 281                 droq->max_count);
 282
 283         droq->recv_buf_list = vzalloc_node(array_size(droq->max_count, OCT_DROQ_RECVBUF_SIZE),
 284                                            numa_node);
 285         if (!droq->recv_buf_list)
 286                 droq->recv_buf_list = vzalloc(array_size(droq->max_count, OCT_DROQ_RECVBUF_SIZE));
 287         if (!droq->recv_buf_list) {
 288                 dev_err(&oct->pci_dev->dev, "Output queue recv buf list alloc failed\n");
 289                 goto init_droq_fail;
 290         }
 291
 292         if (octeon_droq_setup_ring_buffers(oct, droq))
 293                 goto init_droq_fail;
 294
 295         droq->pkts_per_intr = c_pkts_per_intr;
 296         droq->refill_threshold = c_refill_threshold;
 297
 298         dev_dbg(&oct->pci_dev->dev, "DROQ INIT: max_empty_descs: %d\n",
 299                 droq->max_empty_descs);
 300
 301         INIT_LIST_HEAD(&droq->dispatch_list);
 302
 303         /* For 56xx Pass1, this function won't be called, so no checks. */
 304         oct->fn_list.setup_oq_regs(oct, q_no);
 305
 306         oct->io_qmask.oq |= BIT_ULL(q_no);
 307
 308         return 0;
 309
 310 init_droq_fail:
 311         octeon_delete_droq(oct, q_no);
 312         return 1;
 313 }
 314
 315 /* octeon_create_recv_info
 316  * Parameters:
 317  *  octeon_dev - pointer to the octeon device structure
 318  *  droq       - droq in which the packet arrived.
 319  *  buf_cnt    - no. of buffers used by the packet.
 320  *  idx        - index in the descriptor for the first buffer in the packet.
 321  * Description:
 322  *  Allocates a recv_info_t and copies the buffer addresses for packet data
 323  *  into the recv_pkt space which starts at an 8B offset from recv_info_t.
 324  *  Flags the descriptors for refill later. If available descriptors go
 325  *  below the threshold to receive a 64K pkt, new buffers are first allocated
 326  *  before the recv_pkt_t is created.
 327  *  This routine will be called in interrupt context.
 328  * Returns:
 329  *  Success: Pointer to recv_info_t
 330  *  Failure: NULL.
 331  */
 332 static inline struct octeon_recv_info *octeon_create_recv_info(
 333                 struct octeon_device *octeon_dev,
 334                 struct octeon_droq *droq,
 335                 u32 buf_cnt,
 336                 u32 idx)
 337 {
 338         struct octeon_droq_info *info;
 339         struct octeon_recv_pkt *recv_pkt;
 340         struct octeon_recv_info *recv_info;
 341         u32 i, bytes_left;
 342         struct octeon_skb_page_info *pg_info;
 343
 344         info = (struct octeon_droq_info *)droq->recv_buf_list[idx].data;
 345
 346         recv_info = octeon_alloc_recv_info(sizeof(struct __dispatch));
 347         if (!recv_info)
 348                 return NULL;
 349
 350         recv_pkt = recv_info->recv_pkt;
 351         recv_pkt->rh = info->rh;
 352         recv_pkt->length = (u32)info->length;
 353         recv_pkt->buffer_count = (u16)buf_cnt;
 354         recv_pkt->octeon_id = (u16)octeon_dev->octeon_id;
 355
 356         i = 0;
 357         bytes_left = (u32)info->length;
 358
 359         while (buf_cnt) {
 360                 {
 361                         pg_info = &droq->recv_buf_list[idx].pg_info;
 362
 363                         lio_unmap_ring(octeon_dev->pci_dev,
 364                                        (u64)pg_info->dma);
 365                         pg_info->page = NULL;
 366                         pg_info->dma = 0;
 367                 }
 368
 369                 recv_pkt->buffer_size[i] =
 370                         (bytes_left >=
 371                          droq->buffer_size) ? droq->buffer_size : bytes_left;
 372
 373                 recv_pkt->buffer_ptr[i] = droq->recv_buf_list[idx].buffer;
 374                 droq->recv_buf_list[idx].buffer = NULL;
 375
 376                 idx = incr_index(idx, 1, droq->max_count);
 377                 bytes_left -= droq->buffer_size;
 378                 i++;
 379                 buf_cnt--;
 380         }
 381
 382         return recv_info;
 383 }
 384
 385 /* If we were not able to refill all buffers, try to move around
 386  * the buffers that were not dispatched.
 387  */
 388 static inline u32
 389 octeon_droq_refill_pullup_descs(struct octeon_droq *droq,
 390                                 struct octeon_droq_desc *desc_ring)
 391 {
 392         u32 desc_refilled = 0;
 393
 394         u32 refill_index = droq->refill_idx;
 395
 396         while (refill_index != droq->read_idx) {
 397                 if (droq->recv_buf_list[refill_index].buffer) {
 398                         droq->recv_buf_list[droq->refill_idx].buffer =
 399                                 droq->recv_buf_list[refill_index].buffer;
 400                         droq->recv_buf_list[droq->refill_idx].data =
 401                                 droq->recv_buf_list[refill_index].data;
 402                         desc_ring[droq->refill_idx].buffer_ptr =
 403                                 desc_ring[refill_index].buffer_ptr;
 404                         droq->recv_buf_list[refill_index].buffer = NULL;
 405                         desc_ring[refill_index].buffer_ptr = 0;
 406                         do {
 407                                 droq->refill_idx = incr_index(droq->refill_idx,
 408                                                               1,
 409                                                               droq->max_count);
 410                                 desc_refilled++;
 411                                 droq->refill_count--;
 412                         } while (droq->recv_buf_list[droq->refill_idx].buffer);
 413                 }
 414                 refill_index = incr_index(refill_index, 1, droq->max_count);
 415         }                       /* while */
 416         return desc_refilled;
 417 }
 418
 419 /* octeon_droq_refill
 420  * Parameters:
 421  *  droq       - droq in which descriptors require new buffers.
 422  * Description:
 423  *  Called during normal DROQ processing in interrupt mode or by the poll
 424  *  thread to refill the descriptors from which buffers were dispatched
 425  *  to upper layers. Attempts to allocate new buffers. If that fails, moves
 426  *  up buffers (that were not dispatched) to form a contiguous ring.
 427  * Returns:
 428  *  No of descriptors refilled.
 429  */
 430 static u32
 431 octeon_droq_refill(struct octeon_device *octeon_dev, struct octeon_droq *droq)
 432 {
 433         struct octeon_droq_desc *desc_ring;
 434         void *buf = NULL;
 435         u8 *data;
 436         u32 desc_refilled = 0;
 437         struct octeon_skb_page_info *pg_info;
 438
 439         desc_ring = droq->desc_ring;
 440
 441         while (droq->refill_count && (desc_refilled < droq->max_count)) {
 442                 /* If a valid buffer exists (happens if there is no dispatch),
 443                  * reuse the buffer, else allocate.
 444                  */
 445                 if (!droq->recv_buf_list[droq->refill_idx].buffer) {
 446                         pg_info =
 447                                 &droq->recv_buf_list[droq->refill_idx].pg_info;
 448                         /* Either recycle the existing pages or go for
 449                          * new page alloc
 450                          */
 451                         if (pg_info->page)
 452                                 buf = recv_buffer_reuse(octeon_dev, pg_info);
 453                         else
 454                                 buf = recv_buffer_alloc(octeon_dev, pg_info);
 455                         /* If a buffer could not be allocated, no point in
 456                          * continuing
 457                          */
 458                         if (!buf) {
 459                                 droq->stats.rx_alloc_failure++;
 460                                 break;
 461                         }
 462                         droq->recv_buf_list[droq->refill_idx].buffer =
 463                                 buf;
 464                         data = get_rbd(buf);
 465                 } else {
 466                         data = get_rbd(droq->recv_buf_list
 467                                        [droq->refill_idx].buffer);
 468                 }
 469
 470                 droq->recv_buf_list[droq->refill_idx].data = data;
 471
 472                 desc_ring[droq->refill_idx].buffer_ptr =
 473                         lio_map_ring(droq->recv_buf_list[
 474                                      droq->refill_idx].buffer);
 475
 476                 droq->refill_idx = incr_index(droq->refill_idx, 1,
 477                                               droq->max_count);
 478                 desc_refilled++;
 479                 droq->refill_count--;
 480         }
 481
 482         if (droq->refill_count)
 483                 desc_refilled +=
 484                         octeon_droq_refill_pullup_descs(droq, desc_ring);
 485
 486         /* if droq->refill_count
 487          * The refill count would not change in pass two. We only moved buffers
 488          * to close the gap in the ring, but we would still have the same no. of
 489          * buffers to refill.
 490          */
 491         return desc_refilled;
 492 }
 493
 494 /** check if we can allocate packets to get out of oom.
 495  *  @param  droq - Droq being checked.
 496  *  @return 1 if fails to refill minimum
 497  */
 498 int octeon_retry_droq_refill(struct octeon_droq *droq)
 499 {
 500         struct octeon_device *oct = droq->oct_dev;
 501         int desc_refilled, reschedule = 1;
 502         u32 pkts_credit;
 503
 504         pkts_credit = readl(droq->pkts_credit_reg);
 505         desc_refilled = octeon_droq_refill(oct, droq);
 506         if (desc_refilled) {
 507                 /* Flush the droq descriptor data to memory to be sure
 508                  * that when we update the credits the data in memory
 509                  * is accurate.
 510                  */
 511                 wmb();
 512                 writel(desc_refilled, droq->pkts_credit_reg);
 513
 514                 if (pkts_credit + desc_refilled >= CN23XX_SLI_DEF_BP)
 515                         reschedule = 0;
 516         }
 517
 518         return reschedule;
 519 }
 520
 521 static inline u32
 522 octeon_droq_get_bufcount(u32 buf_size, u32 total_len)
 523 {
 524         return DIV_ROUND_UP(total_len, buf_size);
 525 }
 526
 527 static int
 528 octeon_droq_dispatch_pkt(struct octeon_device *oct,
 529                          struct octeon_droq *droq,
 530                          union octeon_rh *rh,
 531                          struct octeon_droq_info *info)
 532 {
 533         u32 cnt;
 534         octeon_dispatch_fn_t disp_fn;
 535         struct octeon_recv_info *rinfo;
 536
 537         cnt = octeon_droq_get_bufcount(droq->buffer_size, (u32)info->length);
 538
 539         disp_fn = octeon_get_dispatch(oct, (u16)rh->r.opcode,
 540                                       (u16)rh->r.subcode);
 541         if (disp_fn) {
 542                 rinfo = octeon_create_recv_info(oct, droq, cnt, droq->read_idx);
 543                 if (rinfo) {
 544                         struct __dispatch *rdisp = rinfo->rsvd;
 545
 546                         rdisp->rinfo = rinfo;
 547                         rdisp->disp_fn = disp_fn;
 548                         rinfo->recv_pkt->rh = *rh;
 549                         list_add_tail(&rdisp->list,
 550                                       &droq->dispatch_list);
 551                 } else {
 552                         droq->stats.dropped_nomem++;
 553                 }
 554         } else {
 555                 dev_err(&oct->pci_dev->dev, "DROQ: No dispatch function (opcode %u/%u)\n",
 556                         (unsigned int)rh->r.opcode,
 557                         (unsigned int)rh->r.subcode);
 558                 droq->stats.dropped_nodispatch++;
 559         }
 560
 561         return cnt;
 562 }
 563
 564 static inline void octeon_droq_drop_packets(struct octeon_device *oct,
 565                                             struct octeon_droq *droq,
 566                                             u32 cnt)
 567 {
 568         u32 i = 0, buf_cnt;
 569         struct octeon_droq_info *info;
 570
 571         for (i = 0; i < cnt; i++) {
 572                 info = (struct octeon_droq_info *)
 573                         droq->recv_buf_list[droq->read_idx].data;
 574                 octeon_swap_8B_data((u64 *)info, 2);
 575
 576                 if (info->length) {
 577                         info->length += OCTNET_FRM_LENGTH_SIZE;
 578                         droq->stats.bytes_received += info->length;
 579                         buf_cnt = octeon_droq_get_bufcount(droq->buffer_size,
 580                                                            (u32)info->length);
 581                 } else {
 582                         dev_err(&oct->pci_dev->dev, "DROQ: In drop: pkt with len 0\n");
 583                         buf_cnt = 1;
 584                 }
 585
 586                 droq->read_idx = incr_index(droq->read_idx, buf_cnt,
 587                                             droq->max_count);
 588                 droq->refill_count += buf_cnt;
 589         }
 590 }
 591
 592 static u32
 593 octeon_droq_fast_process_packets(struct octeon_device *oct,
 594                                  struct octeon_droq *droq,
 595                                  u32 pkts_to_process)
 596 {
 597         u32 pkt, total_len = 0, pkt_count, retval;
 598         struct octeon_droq_info *info;
 599         union octeon_rh *rh;
 600
 601         pkt_count = pkts_to_process;
 602
 603         for (pkt = 0; pkt < pkt_count; pkt++) {
 604                 u32 pkt_len = 0;
 605                 struct sk_buff *nicbuf = NULL;
 606                 struct octeon_skb_page_info *pg_info;
 607                 void *buf;
 608
 609                 info = (struct octeon_droq_info *)
 610                         droq->recv_buf_list[droq->read_idx].data;
 611                 octeon_swap_8B_data((u64 *)info, 2);
 612
 613                 if (!info->length) {
 614                         dev_err(&oct->pci_dev->dev,
 615                                 "DROQ[%d] idx: %d len:0, pkt_cnt: %d\n",
 616                                 droq->q_no, droq->read_idx, pkt_count);
 617                         print_hex_dump_bytes("", DUMP_PREFIX_ADDRESS,
 618                                              (u8 *)info,
 619                                              OCT_DROQ_INFO_SIZE);
 620                         break;
 621                 }
 622
 623                 /* Len of resp hdr in included in the received data len. */
 624                 rh = &info->rh;
 625
 626                 info->length += OCTNET_FRM_LENGTH_SIZE;
 627                 rh->r_dh.len += (ROUNDUP8(OCT_DROQ_INFO_SIZE) / sizeof(u64));
 628                 total_len += (u32)info->length;
 629                 if (opcode_slow_path(rh)) {
 630                         u32 buf_cnt;
 631
 632                         buf_cnt = octeon_droq_dispatch_pkt(oct, droq, rh, info);
 633                         droq->read_idx = incr_index(droq->read_idx,
 634                                                     buf_cnt, droq->max_count);
 635                         droq->refill_count += buf_cnt;
 636                 } else {
 637                         if (info->length <= droq->buffer_size) {
 638                                 pkt_len = (u32)info->length;
 639                                 nicbuf = droq->recv_buf_list[
 640                                         droq->read_idx].buffer;
 641                                 pg_info = &droq->recv_buf_list[
 642                                         droq->read_idx].pg_info;
 643                                 if (recv_buffer_recycle(oct, pg_info))
 644                                         pg_info->page = NULL;
 645                                 droq->recv_buf_list[droq->read_idx].buffer =
 646                                         NULL;
 647
 648                                 droq->read_idx = incr_index(droq->read_idx, 1,
 649                                                             droq->max_count);
 650                                 droq->refill_count++;
 651                         } else {
 652                                 nicbuf = octeon_fast_packet_alloc((u32)
 653                                                                   info->length);
 654                                 pkt_len = 0;
 655                                 /* nicbuf allocation can fail. We'll handle it
 656                                  * inside the loop.
 657                                  */
 658                                 while (pkt_len < info->length) {
 659                                         int cpy_len, idx = droq->read_idx;
 660
 661                                         cpy_len = ((pkt_len + droq->buffer_size)
 662                                                    > info->length) ?
 663                                                 ((u32)info->length - pkt_len) :
 664                                                 droq->buffer_size;
 665
 666                                         if (nicbuf) {
 667                                                 octeon_fast_packet_next(droq,
 668                                                                         nicbuf,
 669                                                                         cpy_len,
 670                                                                         idx);
 671                                                 buf = droq->recv_buf_list[
 672                                                         idx].buffer;
 673                                                 recv_buffer_fast_free(buf);
 674                                                 droq->recv_buf_list[idx].buffer
 675                                                         = NULL;
 676                                         } else {
 677                                                 droq->stats.rx_alloc_failure++;
 678                                         }
 679
 680                                         pkt_len += cpy_len;
 681                                         droq->read_idx =
 682                                                 incr_index(droq->read_idx, 1,
 683                                                            droq->max_count);
 684                                         droq->refill_count++;
 685                                 }
 686                         }
 687
 688                         if (nicbuf) {
 689                                 if (droq->ops.fptr) {
 690                                         droq->ops.fptr(oct->octeon_id,
 691                                                        nicbuf, pkt_len,
 692                                                        rh, &droq->napi,
 693                                                        droq->ops.farg);
 694                                 } else {
 695                                         recv_buffer_free(nicbuf);
 696                                 }
 697                         }
 698                 }
 699
 700                 if (droq->refill_count >= droq->refill_threshold) {
 701                         int desc_refilled = octeon_droq_refill(oct, droq);
 702
 703                         if (desc_refilled) {
 704                                 /* Flush the droq descriptor data to memory to
 705                                  * be sure that when we update the credits the
 706                                  * data in memory is accurate.
 707                                  */
 708                                 wmb();
 709                                 writel(desc_refilled, droq->pkts_credit_reg);
 710                         }
 711                 }
 712         }                       /* for (each packet)... */
 713
 714         /* Increment refill_count by the number of buffers processed. */
 715         droq->stats.pkts_received += pkt;
 716         droq->stats.bytes_received += total_len;
 717
 718         retval = pkt;
 719         if ((droq->ops.drop_on_max) && (pkts_to_process - pkt)) {
 720                 octeon_droq_drop_packets(oct, droq, (pkts_to_process - pkt));
 721
 722                 droq->stats.dropped_toomany += (pkts_to_process - pkt);
 723                 retval = pkts_to_process;
 724         }
 725
 726         atomic_sub(retval, &droq->pkts_pending);
 727
 728         if (droq->refill_count >= droq->refill_threshold &&
 729             readl(droq->pkts_credit_reg) < CN23XX_SLI_DEF_BP) {
 730                 octeon_droq_check_hw_for_pkts(droq);
 731
 732                 /* Make sure there are no pkts_pending */
 733                 if (!atomic_read(&droq->pkts_pending))
 734                         octeon_schedule_rxq_oom_work(oct, droq);
 735         }
 736
 737         return retval;
 738 }
 739
 740 int
 741 octeon_droq_process_packets(struct octeon_device *oct,
 742                             struct octeon_droq *droq,
 743                             u32 budget)
 744 {
 745         u32 pkt_count = 0;
 746         struct list_head *tmp, *tmp2;
 747
 748         octeon_droq_check_hw_for_pkts(droq);
 749         pkt_count = atomic_read(&droq->pkts_pending);
 750
 751         if (!pkt_count)
 752                 return 0;
 753
 754         if (pkt_count > budget)
 755                 pkt_count = budget;
 756
 757         octeon_droq_fast_process_packets(oct, droq, pkt_count);
 758
 759         list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 760                 struct __dispatch *rdisp = (struct __dispatch *)tmp;
 761
 762                 list_del(tmp);
 763                 rdisp->disp_fn(rdisp->rinfo,
 764                                octeon_get_dispatch_arg
 765                                (oct,
 766                                 (u16)rdisp->rinfo->recv_pkt->rh.r.opcode,
 767                                 (u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 768         }
 769
 770         /* If there are packets pending. schedule tasklet again */
 771         if (atomic_read(&droq->pkts_pending))
 772                 return 1;
 773
 774         return 0;
 775 }
 776
 777 /**
 778  * Utility function to poll for packets. check_hw_for_packets must be
 779  * called before calling this routine.
 780  */
 781
 782 int
 783 octeon_droq_process_poll_pkts(struct octeon_device *oct,
 784                               struct octeon_droq *droq, u32 budget)
 785 {
 786         struct list_head *tmp, *tmp2;
 787         u32 pkts_available = 0, pkts_processed = 0;
 788         u32 total_pkts_processed = 0;
 789
 790         if (budget > droq->max_count)
 791                 budget = droq->max_count;
 792
 793         while (total_pkts_processed < budget) {
 794                 octeon_droq_check_hw_for_pkts(droq);
 795
 796                 pkts_available = min((budget - total_pkts_processed),
 797                                      (u32)(atomic_read(&droq->pkts_pending)));
 798
 799                 if (pkts_available == 0)
 800                         break;
 801
 802                 pkts_processed =
 803                         octeon_droq_fast_process_packets(oct, droq,
 804                                                          pkts_available);
 805
 806                 total_pkts_processed += pkts_processed;
 807         }
 808
 809         list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 810                 struct __dispatch *rdisp = (struct __dispatch *)tmp;
 811
 812                 list_del(tmp);
 813                 rdisp->disp_fn(rdisp->rinfo,
 814                                octeon_get_dispatch_arg
 815                                (oct,
 816                                 (u16)rdisp->rinfo->recv_pkt->rh.r.opcode,
 817                                 (u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 818         }
 819
 820         return total_pkts_processed;
 821 }
 822
 823 /* Enable Pkt Interrupt */
 824 int
 825 octeon_enable_irq(struct octeon_device *oct, u32 q_no)
 826 {
 827         switch (oct->chip_id) {
 828         case OCTEON_CN66XX:
 829         case OCTEON_CN68XX: {
 830                 struct octeon_cn6xxx *cn6xxx =
 831                         (struct octeon_cn6xxx *)oct->chip;
 832                 unsigned long flags;
 833                 u32 value;
 834
 835                 spin_lock_irqsave
 836                         (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 837                 value = octeon_read_csr(oct, CN6XXX_SLI_PKT_TIME_INT_ENB);
 838                 value |= (1 << q_no);
 839                 octeon_write_csr(oct, CN6XXX_SLI_PKT_TIME_INT_ENB, value);
 840                 value = octeon_read_csr(oct, CN6XXX_SLI_PKT_CNT_INT_ENB);
 841                 value |= (1 << q_no);
 842                 octeon_write_csr(oct, CN6XXX_SLI_PKT_CNT_INT_ENB, value);
 843
 844                 /* don't bother flushing the enables */
 845
 846                 spin_unlock_irqrestore
 847                         (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 848         }
 849                 break;
 850         case OCTEON_CN23XX_PF_VID:
 851                 lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 852                 break;
 853
 854         case OCTEON_CN23XX_VF_VID:
 855                 lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 856                 break;
 857         default:
 858                 dev_err(&oct->pci_dev->dev, "%s Unknown Chip\n", __func__);
 859                 return 1;
 860         }
 861
 862         return 0;
 863 }
 864
 865 int octeon_register_droq_ops(struct octeon_device *oct, u32 q_no,
 866                              struct octeon_droq_ops *ops)
 867 {
 868         struct octeon_config *oct_cfg = NULL;
 869         struct octeon_droq *droq;
 870
 871         oct_cfg = octeon_get_conf(oct);
 872
 873         if (!oct_cfg)
 874                 return -EINVAL;
 875
 876         if (!(ops)) {
 877                 dev_err(&oct->pci_dev->dev, "%s: droq_ops pointer is NULL\n",
 878                         __func__);
 879                 return -EINVAL;
 880         }
 881
 882         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 883                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 884                         __func__, q_no, (oct->num_oqs - 1));
 885                 return -EINVAL;
 886         }
 887
 888         droq = oct->droq[q_no];
 889         memcpy(&droq->ops, ops, sizeof(struct octeon_droq_ops));
 890
 891         return 0;
 892 }
 893
 894 int octeon_unregister_droq_ops(struct octeon_device *oct, u32 q_no)
 895 {
 896         struct octeon_config *oct_cfg = NULL;
 897         struct octeon_droq *droq;
 898
 899         oct_cfg = octeon_get_conf(oct);
 900
 901         if (!oct_cfg)
 902                 return -EINVAL;
 903
 904         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 905                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 906                         __func__, q_no, oct->num_oqs - 1);
 907                 return -EINVAL;
 908         }
 909
 910         droq = oct->droq[q_no];
 911
 912         if (!droq) {
 913                 dev_info(&oct->pci_dev->dev,
 914                          "Droq id (%d) not available.\n", q_no);
 915                 return 0;
 916         }
 917
 918         droq->ops.fptr = NULL;
 919         droq->ops.farg = NULL;
 920         droq->ops.drop_on_max = 0;
 921
 922         return 0;
 923 }
 924
 925 int octeon_create_droq(struct octeon_device *oct,
 926                        u32 q_no, u32 num_descs,
 927                        u32 desc_size, void *app_ctx)
 928 {
 929         struct octeon_droq *droq;
 930         int numa_node = dev_to_node(&oct->pci_dev->dev);
 931
 932         if (oct->droq[q_no]) {
 933                 dev_dbg(&oct->pci_dev->dev, "Droq already in use. Cannot create droq %d again\n",
 934                         q_no);
 935                 return 1;
 936         }
 937
 938         /* Allocate the DS for the new droq. */
 939         droq = vmalloc_node(sizeof(*droq), numa_node);
 940         if (!droq)
 941                 droq = vmalloc(sizeof(*droq));
 942         if (!droq)
 943                 return -1;
 944
 945         memset(droq, 0, sizeof(struct octeon_droq));
 946
 947         /*Disable the pkt o/p for this Q  */
 948         octeon_set_droq_pkt_op(oct, q_no, 0);
 949         oct->droq[q_no] = droq;
 950
 951         /* Initialize the Droq */
 952         if (octeon_init_droq(oct, q_no, num_descs, desc_size, app_ctx)) {
 953                 vfree(oct->droq[q_no]);
 954                 oct->droq[q_no] = NULL;
 955                 return -1;
 956         }
 957
 958         oct->num_oqs++;
 959
 960         dev_dbg(&oct->pci_dev->dev, "%s: Total number of OQ: %d\n", __func__,
 961                 oct->num_oqs);
 962
 963         /* Global Droq register settings */
 964
 965         /* As of now not required, as setting are done for all 32 Droqs at
 966          * the same time.
 967          */
 968         return 0;
 969 }