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 = (struct octeon_recv_buffer *)
 284               vzalloc_node(array_size(droq->max_count, OCT_DROQ_RECVBUF_SIZE),
 285                            numa_node);
 286         if (!droq->recv_buf_list)
 287                 droq->recv_buf_list = (struct octeon_recv_buffer *)
 288                       vzalloc(array_size(droq->max_count,
 289                                          OCT_DROQ_RECVBUF_SIZE));
 290         if (!droq->recv_buf_list) {
 291                 dev_err(&oct->pci_dev->dev, "Output queue recv buf list alloc failed\n");
 292                 goto init_droq_fail;
 293         }
 294
 295         if (octeon_droq_setup_ring_buffers(oct, droq))
 296                 goto init_droq_fail;
 297
 298         droq->pkts_per_intr = c_pkts_per_intr;
 299         droq->refill_threshold = c_refill_threshold;
 300
 301         dev_dbg(&oct->pci_dev->dev, "DROQ INIT: max_empty_descs: %d\n",
 302                 droq->max_empty_descs);
 303
 304         INIT_LIST_HEAD(&droq->dispatch_list);
 305
 306         /* For 56xx Pass1, this function won't be called, so no checks. */
 307         oct->fn_list.setup_oq_regs(oct, q_no);
 308
 309         oct->io_qmask.oq |= BIT_ULL(q_no);
 310
 311         return 0;
 312
 313 init_droq_fail:
 314         octeon_delete_droq(oct, q_no);
 315         return 1;
 316 }
 317
 318 /* octeon_create_recv_info
 319  * Parameters:
 320  *  octeon_dev - pointer to the octeon device structure
 321  *  droq       - droq in which the packet arrived.
 322  *  buf_cnt    - no. of buffers used by the packet.
 323  *  idx        - index in the descriptor for the first buffer in the packet.
 324  * Description:
 325  *  Allocates a recv_info_t and copies the buffer addresses for packet data
 326  *  into the recv_pkt space which starts at an 8B offset from recv_info_t.
 327  *  Flags the descriptors for refill later. If available descriptors go
 328  *  below the threshold to receive a 64K pkt, new buffers are first allocated
 329  *  before the recv_pkt_t is created.
 330  *  This routine will be called in interrupt context.
 331  * Returns:
 332  *  Success: Pointer to recv_info_t
 333  *  Failure: NULL.
 334  */
 335 static inline struct octeon_recv_info *octeon_create_recv_info(
 336                 struct octeon_device *octeon_dev,
 337                 struct octeon_droq *droq,
 338                 u32 buf_cnt,
 339                 u32 idx)
 340 {
 341         struct octeon_droq_info *info;
 342         struct octeon_recv_pkt *recv_pkt;
 343         struct octeon_recv_info *recv_info;
 344         u32 i, bytes_left;
 345         struct octeon_skb_page_info *pg_info;
 346
 347         info = (struct octeon_droq_info *)droq->recv_buf_list[idx].data;
 348
 349         recv_info = octeon_alloc_recv_info(sizeof(struct __dispatch));
 350         if (!recv_info)
 351                 return NULL;
 352
 353         recv_pkt = recv_info->recv_pkt;
 354         recv_pkt->rh = info->rh;
 355         recv_pkt->length = (u32)info->length;
 356         recv_pkt->buffer_count = (u16)buf_cnt;
 357         recv_pkt->octeon_id = (u16)octeon_dev->octeon_id;
 358
 359         i = 0;
 360         bytes_left = (u32)info->length;
 361
 362         while (buf_cnt) {
 363                 {
 364                         pg_info = &droq->recv_buf_list[idx].pg_info;
 365
 366                         lio_unmap_ring(octeon_dev->pci_dev,
 367                                        (u64)pg_info->dma);
 368                         pg_info->page = NULL;
 369                         pg_info->dma = 0;
 370                 }
 371
 372                 recv_pkt->buffer_size[i] =
 373                         (bytes_left >=
 374                          droq->buffer_size) ? droq->buffer_size : bytes_left;
 375
 376                 recv_pkt->buffer_ptr[i] = droq->recv_buf_list[idx].buffer;
 377                 droq->recv_buf_list[idx].buffer = NULL;
 378
 379                 idx = incr_index(idx, 1, droq->max_count);
 380                 bytes_left -= droq->buffer_size;
 381                 i++;
 382                 buf_cnt--;
 383         }
 384
 385         return recv_info;
 386 }
 387
 388 /* If we were not able to refill all buffers, try to move around
 389  * the buffers that were not dispatched.
 390  */
 391 static inline u32
 392 octeon_droq_refill_pullup_descs(struct octeon_droq *droq,
 393                                 struct octeon_droq_desc *desc_ring)
 394 {
 395         u32 desc_refilled = 0;
 396
 397         u32 refill_index = droq->refill_idx;
 398
 399         while (refill_index != droq->read_idx) {
 400                 if (droq->recv_buf_list[refill_index].buffer) {
 401                         droq->recv_buf_list[droq->refill_idx].buffer =
 402                                 droq->recv_buf_list[refill_index].buffer;
 403                         droq->recv_buf_list[droq->refill_idx].data =
 404                                 droq->recv_buf_list[refill_index].data;
 405                         desc_ring[droq->refill_idx].buffer_ptr =
 406                                 desc_ring[refill_index].buffer_ptr;
 407                         droq->recv_buf_list[refill_index].buffer = NULL;
 408                         desc_ring[refill_index].buffer_ptr = 0;
 409                         do {
 410                                 droq->refill_idx = incr_index(droq->refill_idx,
 411                                                               1,
 412                                                               droq->max_count);
 413                                 desc_refilled++;
 414                                 droq->refill_count--;
 415                         } while (droq->recv_buf_list[droq->refill_idx].buffer);
 416                 }
 417                 refill_index = incr_index(refill_index, 1, droq->max_count);
 418         }                       /* while */
 419         return desc_refilled;
 420 }
 421
 422 /* octeon_droq_refill
 423  * Parameters:
 424  *  droq       - droq in which descriptors require new buffers.
 425  * Description:
 426  *  Called during normal DROQ processing in interrupt mode or by the poll
 427  *  thread to refill the descriptors from which buffers were dispatched
 428  *  to upper layers. Attempts to allocate new buffers. If that fails, moves
 429  *  up buffers (that were not dispatched) to form a contiguous ring.
 430  * Returns:
 431  *  No of descriptors refilled.
 432  */
 433 static u32
 434 octeon_droq_refill(struct octeon_device *octeon_dev, struct octeon_droq *droq)
 435 {
 436         struct octeon_droq_desc *desc_ring;
 437         void *buf = NULL;
 438         u8 *data;
 439         u32 desc_refilled = 0;
 440         struct octeon_skb_page_info *pg_info;
 441
 442         desc_ring = droq->desc_ring;
 443
 444         while (droq->refill_count && (desc_refilled < droq->max_count)) {
 445                 /* If a valid buffer exists (happens if there is no dispatch),
 446                  * reuse the buffer, else allocate.
 447                  */
 448                 if (!droq->recv_buf_list[droq->refill_idx].buffer) {
 449                         pg_info =
 450                                 &droq->recv_buf_list[droq->refill_idx].pg_info;
 451                         /* Either recycle the existing pages or go for
 452                          * new page alloc
 453                          */
 454                         if (pg_info->page)
 455                                 buf = recv_buffer_reuse(octeon_dev, pg_info);
 456                         else
 457                                 buf = recv_buffer_alloc(octeon_dev, pg_info);
 458                         /* If a buffer could not be allocated, no point in
 459                          * continuing
 460                          */
 461                         if (!buf) {
 462                                 droq->stats.rx_alloc_failure++;
 463                                 break;
 464                         }
 465                         droq->recv_buf_list[droq->refill_idx].buffer =
 466                                 buf;
 467                         data = get_rbd(buf);
 468                 } else {
 469                         data = get_rbd(droq->recv_buf_list
 470                                        [droq->refill_idx].buffer);
 471                 }
 472
 473                 droq->recv_buf_list[droq->refill_idx].data = data;
 474
 475                 desc_ring[droq->refill_idx].buffer_ptr =
 476                         lio_map_ring(droq->recv_buf_list[
 477                                      droq->refill_idx].buffer);
 478
 479                 droq->refill_idx = incr_index(droq->refill_idx, 1,
 480                                               droq->max_count);
 481                 desc_refilled++;
 482                 droq->refill_count--;
 483         }
 484
 485         if (droq->refill_count)
 486                 desc_refilled +=
 487                         octeon_droq_refill_pullup_descs(droq, desc_ring);
 488
 489         /* if droq->refill_count
 490          * The refill count would not change in pass two. We only moved buffers
 491          * to close the gap in the ring, but we would still have the same no. of
 492          * buffers to refill.
 493          */
 494         return desc_refilled;
 495 }
 496
 497 /** check if we can allocate packets to get out of oom.
 498  *  @param  droq - Droq being checked.
 499  *  @return 1 if fails to refill minimum
 500  */
 501 int octeon_retry_droq_refill(struct octeon_droq *droq)
 502 {
 503         struct octeon_device *oct = droq->oct_dev;
 504         int desc_refilled, reschedule = 1;
 505         u32 pkts_credit;
 506
 507         pkts_credit = readl(droq->pkts_credit_reg);
 508         desc_refilled = octeon_droq_refill(oct, droq);
 509         if (desc_refilled) {
 510                 /* Flush the droq descriptor data to memory to be sure
 511                  * that when we update the credits the data in memory
 512                  * is accurate.
 513                  */
 514                 wmb();
 515                 writel(desc_refilled, droq->pkts_credit_reg);
 516                 /* make sure mmio write completes */
 517                 mmiowb();
 518
 519                 if (pkts_credit + desc_refilled >= CN23XX_SLI_DEF_BP)
 520                         reschedule = 0;
 521         }
 522
 523         return reschedule;
 524 }
 525
 526 static inline u32
 527 octeon_droq_get_bufcount(u32 buf_size, u32 total_len)
 528 {
 529         return DIV_ROUND_UP(total_len, buf_size);
 530 }
 531
 532 static int
 533 octeon_droq_dispatch_pkt(struct octeon_device *oct,
 534                          struct octeon_droq *droq,
 535                          union octeon_rh *rh,
 536                          struct octeon_droq_info *info)
 537 {
 538         u32 cnt;
 539         octeon_dispatch_fn_t disp_fn;
 540         struct octeon_recv_info *rinfo;
 541
 542         cnt = octeon_droq_get_bufcount(droq->buffer_size, (u32)info->length);
 543
 544         disp_fn = octeon_get_dispatch(oct, (u16)rh->r.opcode,
 545                                       (u16)rh->r.subcode);
 546         if (disp_fn) {
 547                 rinfo = octeon_create_recv_info(oct, droq, cnt, droq->read_idx);
 548                 if (rinfo) {
 549                         struct __dispatch *rdisp = rinfo->rsvd;
 550
 551                         rdisp->rinfo = rinfo;
 552                         rdisp->disp_fn = disp_fn;
 553                         rinfo->recv_pkt->rh = *rh;
 554                         list_add_tail(&rdisp->list,
 555                                       &droq->dispatch_list);
 556                 } else {
 557                         droq->stats.dropped_nomem++;
 558                 }
 559         } else {
 560                 dev_err(&oct->pci_dev->dev, "DROQ: No dispatch function (opcode %u/%u)\n",
 561                         (unsigned int)rh->r.opcode,
 562                         (unsigned int)rh->r.subcode);
 563                 droq->stats.dropped_nodispatch++;
 564         }
 565
 566         return cnt;
 567 }
 568
 569 static inline void octeon_droq_drop_packets(struct octeon_device *oct,
 570                                             struct octeon_droq *droq,
 571                                             u32 cnt)
 572 {
 573         u32 i = 0, buf_cnt;
 574         struct octeon_droq_info *info;
 575
 576         for (i = 0; i < cnt; i++) {
 577                 info = (struct octeon_droq_info *)
 578                         droq->recv_buf_list[droq->read_idx].data;
 579                 octeon_swap_8B_data((u64 *)info, 2);
 580
 581                 if (info->length) {
 582                         info->length += OCTNET_FRM_LENGTH_SIZE;
 583                         droq->stats.bytes_received += info->length;
 584                         buf_cnt = octeon_droq_get_bufcount(droq->buffer_size,
 585                                                            (u32)info->length);
 586                 } else {
 587                         dev_err(&oct->pci_dev->dev, "DROQ: In drop: pkt with len 0\n");
 588                         buf_cnt = 1;
 589                 }
 590
 591                 droq->read_idx = incr_index(droq->read_idx, buf_cnt,
 592                                             droq->max_count);
 593                 droq->refill_count += buf_cnt;
 594         }
 595 }
 596
 597 static u32
 598 octeon_droq_fast_process_packets(struct octeon_device *oct,
 599                                  struct octeon_droq *droq,
 600                                  u32 pkts_to_process)
 601 {
 602         u32 pkt, total_len = 0, pkt_count, retval;
 603         struct octeon_droq_info *info;
 604         union octeon_rh *rh;
 605
 606         pkt_count = pkts_to_process;
 607
 608         for (pkt = 0; pkt < pkt_count; pkt++) {
 609                 u32 pkt_len = 0;
 610                 struct sk_buff *nicbuf = NULL;
 611                 struct octeon_skb_page_info *pg_info;
 612                 void *buf;
 613
 614                 info = (struct octeon_droq_info *)
 615                         droq->recv_buf_list[droq->read_idx].data;
 616                 octeon_swap_8B_data((u64 *)info, 2);
 617
 618                 if (!info->length) {
 619                         dev_err(&oct->pci_dev->dev,
 620                                 "DROQ[%d] idx: %d len:0, pkt_cnt: %d\n",
 621                                 droq->q_no, droq->read_idx, pkt_count);
 622                         print_hex_dump_bytes("", DUMP_PREFIX_ADDRESS,
 623                                              (u8 *)info,
 624                                              OCT_DROQ_INFO_SIZE);
 625                         break;
 626                 }
 627
 628                 /* Len of resp hdr in included in the received data len. */
 629                 rh = &info->rh;
 630
 631                 info->length += OCTNET_FRM_LENGTH_SIZE;
 632                 rh->r_dh.len += (ROUNDUP8(OCT_DROQ_INFO_SIZE) / sizeof(u64));
 633                 total_len += (u32)info->length;
 634                 if (opcode_slow_path(rh)) {
 635                         u32 buf_cnt;
 636
 637                         buf_cnt = octeon_droq_dispatch_pkt(oct, droq, rh, info);
 638                         droq->read_idx = incr_index(droq->read_idx,
 639                                                     buf_cnt, droq->max_count);
 640                         droq->refill_count += buf_cnt;
 641                 } else {
 642                         if (info->length <= droq->buffer_size) {
 643                                 pkt_len = (u32)info->length;
 644                                 nicbuf = droq->recv_buf_list[
 645                                         droq->read_idx].buffer;
 646                                 pg_info = &droq->recv_buf_list[
 647                                         droq->read_idx].pg_info;
 648                                 if (recv_buffer_recycle(oct, pg_info))
 649                                         pg_info->page = NULL;
 650                                 droq->recv_buf_list[droq->read_idx].buffer =
 651                                         NULL;
 652
 653                                 droq->read_idx = incr_index(droq->read_idx, 1,
 654                                                             droq->max_count);
 655                                 droq->refill_count++;
 656                         } else {
 657                                 nicbuf = octeon_fast_packet_alloc((u32)
 658                                                                   info->length);
 659                                 pkt_len = 0;
 660                                 /* nicbuf allocation can fail. We'll handle it
 661                                  * inside the loop.
 662                                  */
 663                                 while (pkt_len < info->length) {
 664                                         int cpy_len, idx = droq->read_idx;
 665
 666                                         cpy_len = ((pkt_len + droq->buffer_size)
 667                                                    > info->length) ?
 668                                                 ((u32)info->length - pkt_len) :
 669                                                 droq->buffer_size;
 670
 671                                         if (nicbuf) {
 672                                                 octeon_fast_packet_next(droq,
 673                                                                         nicbuf,
 674                                                                         cpy_len,
 675                                                                         idx);
 676                                                 buf = droq->recv_buf_list[
 677                                                         idx].buffer;
 678                                                 recv_buffer_fast_free(buf);
 679                                                 droq->recv_buf_list[idx].buffer
 680                                                         = NULL;
 681                                         } else {
 682                                                 droq->stats.rx_alloc_failure++;
 683                                         }
 684
 685                                         pkt_len += cpy_len;
 686                                         droq->read_idx =
 687                                                 incr_index(droq->read_idx, 1,
 688                                                            droq->max_count);
 689                                         droq->refill_count++;
 690                                 }
 691                         }
 692
 693                         if (nicbuf) {
 694                                 if (droq->ops.fptr) {
 695                                         droq->ops.fptr(oct->octeon_id,
 696                                                        nicbuf, pkt_len,
 697                                                        rh, &droq->napi,
 698                                                        droq->ops.farg);
 699                                 } else {
 700                                         recv_buffer_free(nicbuf);
 701                                 }
 702                         }
 703                 }
 704
 705                 if (droq->refill_count >= droq->refill_threshold) {
 706                         int desc_refilled = octeon_droq_refill(oct, droq);
 707
 708                         if (desc_refilled) {
 709                                 /* Flush the droq descriptor data to memory to
 710                                  * be sure that when we update the credits the
 711                                  * data in memory is accurate.
 712                                  */
 713                                 wmb();
 714                                 writel(desc_refilled, droq->pkts_credit_reg);
 715                                 /* make sure mmio write completes */
 716                                 mmiowb();
 717                         }
 718                 }
 719         }                       /* for (each packet)... */
 720
 721         /* Increment refill_count by the number of buffers processed. */
 722         droq->stats.pkts_received += pkt;
 723         droq->stats.bytes_received += total_len;
 724
 725         retval = pkt;
 726         if ((droq->ops.drop_on_max) && (pkts_to_process - pkt)) {
 727                 octeon_droq_drop_packets(oct, droq, (pkts_to_process - pkt));
 728
 729                 droq->stats.dropped_toomany += (pkts_to_process - pkt);
 730                 retval = pkts_to_process;
 731         }
 732
 733         atomic_sub(retval, &droq->pkts_pending);
 734
 735         if (droq->refill_count >= droq->refill_threshold &&
 736             readl(droq->pkts_credit_reg) < CN23XX_SLI_DEF_BP) {
 737                 octeon_droq_check_hw_for_pkts(droq);
 738
 739                 /* Make sure there are no pkts_pending */
 740                 if (!atomic_read(&droq->pkts_pending))
 741                         octeon_schedule_rxq_oom_work(oct, droq);
 742         }
 743
 744         return retval;
 745 }
 746
 747 int
 748 octeon_droq_process_packets(struct octeon_device *oct,
 749                             struct octeon_droq *droq,
 750                             u32 budget)
 751 {
 752         u32 pkt_count = 0;
 753         struct list_head *tmp, *tmp2;
 754
 755         octeon_droq_check_hw_for_pkts(droq);
 756         pkt_count = atomic_read(&droq->pkts_pending);
 757
 758         if (!pkt_count)
 759                 return 0;
 760
 761         if (pkt_count > budget)
 762                 pkt_count = budget;
 763
 764         octeon_droq_fast_process_packets(oct, droq, pkt_count);
 765
 766         list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 767                 struct __dispatch *rdisp = (struct __dispatch *)tmp;
 768
 769                 list_del(tmp);
 770                 rdisp->disp_fn(rdisp->rinfo,
 771                                octeon_get_dispatch_arg
 772                                (oct,
 773                                 (u16)rdisp->rinfo->recv_pkt->rh.r.opcode,
 774                                 (u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 775         }
 776
 777         /* If there are packets pending. schedule tasklet again */
 778         if (atomic_read(&droq->pkts_pending))
 779                 return 1;
 780
 781         return 0;
 782 }
 783
 784 /**
 785  * Utility function to poll for packets. check_hw_for_packets must be
 786  * called before calling this routine.
 787  */
 788
 789 int
 790 octeon_droq_process_poll_pkts(struct octeon_device *oct,
 791                               struct octeon_droq *droq, u32 budget)
 792 {
 793         struct list_head *tmp, *tmp2;
 794         u32 pkts_available = 0, pkts_processed = 0;
 795         u32 total_pkts_processed = 0;
 796
 797         if (budget > droq->max_count)
 798                 budget = droq->max_count;
 799
 800         while (total_pkts_processed < budget) {
 801                 octeon_droq_check_hw_for_pkts(droq);
 802
 803                 pkts_available = min((budget - total_pkts_processed),
 804                                      (u32)(atomic_read(&droq->pkts_pending)));
 805
 806                 if (pkts_available == 0)
 807                         break;
 808
 809                 pkts_processed =
 810                         octeon_droq_fast_process_packets(oct, droq,
 811                                                          pkts_available);
 812
 813                 total_pkts_processed += pkts_processed;
 814         }
 815
 816         list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 817                 struct __dispatch *rdisp = (struct __dispatch *)tmp;
 818
 819                 list_del(tmp);
 820                 rdisp->disp_fn(rdisp->rinfo,
 821                                octeon_get_dispatch_arg
 822                                (oct,
 823                                 (u16)rdisp->rinfo->recv_pkt->rh.r.opcode,
 824                                 (u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 825         }
 826
 827         return total_pkts_processed;
 828 }
 829
 830 /* Enable Pkt Interrupt */
 831 int
 832 octeon_enable_irq(struct octeon_device *oct, u32 q_no)
 833 {
 834         switch (oct->chip_id) {
 835         case OCTEON_CN66XX:
 836         case OCTEON_CN68XX: {
 837                 struct octeon_cn6xxx *cn6xxx =
 838                         (struct octeon_cn6xxx *)oct->chip;
 839                 unsigned long flags;
 840                 u32 value;
 841
 842                 spin_lock_irqsave
 843                         (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 844                 value = octeon_read_csr(oct, CN6XXX_SLI_PKT_TIME_INT_ENB);
 845                 value |= (1 << q_no);
 846                 octeon_write_csr(oct, CN6XXX_SLI_PKT_TIME_INT_ENB, value);
 847                 value = octeon_read_csr(oct, CN6XXX_SLI_PKT_CNT_INT_ENB);
 848                 value |= (1 << q_no);
 849                 octeon_write_csr(oct, CN6XXX_SLI_PKT_CNT_INT_ENB, value);
 850
 851                 /* don't bother flushing the enables */
 852
 853                 spin_unlock_irqrestore
 854                         (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 855         }
 856                 break;
 857         case OCTEON_CN23XX_PF_VID:
 858                 lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 859                 break;
 860
 861         case OCTEON_CN23XX_VF_VID:
 862                 lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 863                 break;
 864         default:
 865                 dev_err(&oct->pci_dev->dev, "%s Unknown Chip\n", __func__);
 866                 return 1;
 867         }
 868
 869         return 0;
 870 }
 871
 872 int octeon_register_droq_ops(struct octeon_device *oct, u32 q_no,
 873                              struct octeon_droq_ops *ops)
 874 {
 875         struct octeon_config *oct_cfg = NULL;
 876         struct octeon_droq *droq;
 877
 878         oct_cfg = octeon_get_conf(oct);
 879
 880         if (!oct_cfg)
 881                 return -EINVAL;
 882
 883         if (!(ops)) {
 884                 dev_err(&oct->pci_dev->dev, "%s: droq_ops pointer is NULL\n",
 885                         __func__);
 886                 return -EINVAL;
 887         }
 888
 889         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 890                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 891                         __func__, q_no, (oct->num_oqs - 1));
 892                 return -EINVAL;
 893         }
 894
 895         droq = oct->droq[q_no];
 896         memcpy(&droq->ops, ops, sizeof(struct octeon_droq_ops));
 897
 898         return 0;
 899 }
 900
 901 int octeon_unregister_droq_ops(struct octeon_device *oct, u32 q_no)
 902 {
 903         struct octeon_config *oct_cfg = NULL;
 904         struct octeon_droq *droq;
 905
 906         oct_cfg = octeon_get_conf(oct);
 907
 908         if (!oct_cfg)
 909                 return -EINVAL;
 910
 911         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 912                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 913                         __func__, q_no, oct->num_oqs - 1);
 914                 return -EINVAL;
 915         }
 916
 917         droq = oct->droq[q_no];
 918
 919         if (!droq) {
 920                 dev_info(&oct->pci_dev->dev,
 921                          "Droq id (%d) not available.\n", q_no);
 922                 return 0;
 923         }
 924
 925         droq->ops.fptr = NULL;
 926         droq->ops.farg = NULL;
 927         droq->ops.drop_on_max = 0;
 928
 929         return 0;
 930 }
 931
 932 int octeon_create_droq(struct octeon_device *oct,
 933                        u32 q_no, u32 num_descs,
 934                        u32 desc_size, void *app_ctx)
 935 {
 936         struct octeon_droq *droq;
 937         int numa_node = dev_to_node(&oct->pci_dev->dev);
 938
 939         if (oct->droq[q_no]) {
 940                 dev_dbg(&oct->pci_dev->dev, "Droq already in use. Cannot create droq %d again\n",
 941                         q_no);
 942                 return 1;
 943         }
 944
 945         /* Allocate the DS for the new droq. */
 946         droq = vmalloc_node(sizeof(*droq), numa_node);
 947         if (!droq)
 948                 droq = vmalloc(sizeof(*droq));
 949         if (!droq)
 950                 return -1;
 951
 952         memset(droq, 0, sizeof(struct octeon_droq));
 953
 954         /*Disable the pkt o/p for this Q  */
 955         octeon_set_droq_pkt_op(oct, q_no, 0);
 956         oct->droq[q_no] = droq;
 957
 958         /* Initialize the Droq */
 959         if (octeon_init_droq(oct, q_no, num_descs, desc_size, app_ctx)) {
 960                 vfree(oct->droq[q_no]);
 961                 oct->droq[q_no] = NULL;
 962                 return -1;
 963         }
 964
 965         oct->num_oqs++;
 966
 967         dev_dbg(&oct->pci_dev->dev, "%s: Total number of OQ: %d\n", __func__,
 968                 oct->num_oqs);
 969
 970         /* Global Droq register settings */
 971
 972         /* As of now not required, as setting are done for all 32 Droqs at
 973          * the same time.
 974          */
 975         return 0;
 976 }