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 static inline 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
 149                 if (pg_info->dma)
 150                         lio_unmap_ring(oct->pci_dev,
 151                                        (u64)pg_info->dma);
 152                 pg_info->dma = 0;
 153
 154                 if (pg_info->page)
 155                         recv_buffer_destroy(droq->recv_buf_list[i].buffer,
 156                                             pg_info);
 157
 158                 droq->recv_buf_list[i].buffer = NULL;
 159         }
 160
 161         octeon_droq_reset_indices(droq);
 162 }
 163
 164 static int
 165 octeon_droq_setup_ring_buffers(struct octeon_device *oct,
 166                                struct octeon_droq *droq)
 167 {
 168         u32 i;
 169         void *buf;
 170         struct octeon_droq_desc *desc_ring = droq->desc_ring;
 171
 172         for (i = 0; i < droq->max_count; i++) {
 173                 buf = recv_buffer_alloc(oct, &droq->recv_buf_list[i].pg_info);
 174
 175                 if (!buf) {
 176                         dev_err(&oct->pci_dev->dev, "%s buffer alloc failed\n",
 177                                 __func__);
 178                         droq->stats.rx_alloc_failure++;
 179                         return -ENOMEM;
 180                 }
 181
 182                 droq->recv_buf_list[i].buffer = buf;
 183                 droq->recv_buf_list[i].data = get_rbd(buf);
 184                 droq->info_list[i].length = 0;
 185
 186                 /* map ring buffers into memory */
 187                 desc_ring[i].info_ptr = lio_map_ring_info(droq, i);
 188                 desc_ring[i].buffer_ptr =
 189                         lio_map_ring(droq->recv_buf_list[i].buffer);
 190         }
 191
 192         octeon_droq_reset_indices(droq);
 193
 194         octeon_droq_compute_max_packet_bufs(droq);
 195
 196         return 0;
 197 }
 198
 199 int octeon_delete_droq(struct octeon_device *oct, u32 q_no)
 200 {
 201         struct octeon_droq *droq = oct->droq[q_no];
 202
 203         dev_dbg(&oct->pci_dev->dev, "%s[%d]\n", __func__, q_no);
 204
 205         octeon_droq_destroy_ring_buffers(oct, droq);
 206         vfree(droq->recv_buf_list);
 207
 208         if (droq->info_base_addr)
 209                 lio_free_info_buffer(oct, droq);
 210
 211         if (droq->desc_ring)
 212                 lio_dma_free(oct, (droq->max_count * OCT_DROQ_DESC_SIZE),
 213                              droq->desc_ring, droq->desc_ring_dma);
 214
 215         memset(droq, 0, OCT_DROQ_SIZE);
 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 orig_node = dev_to_node(&oct->pci_dev->dev);
 230         int numa_node = cpu_to_node(q_no % num_online_cpus());
 231
 232         dev_dbg(&oct->pci_dev->dev, "%s[%d]\n", __func__, q_no);
 233
 234         droq = oct->droq[q_no];
 235         memset(droq, 0, OCT_DROQ_SIZE);
 236
 237         droq->oct_dev = oct;
 238         droq->q_no = q_no;
 239         if (app_ctx)
 240                 droq->app_ctx = app_ctx;
 241         else
 242                 droq->app_ctx = (void *)(size_t)q_no;
 243
 244         c_num_descs = num_descs;
 245         c_buf_size = desc_size;
 246         if (OCTEON_CN6XXX(oct)) {
 247                 struct octeon_config *conf6x = CHIP_CONF(oct, cn6xxx);
 248
 249                 c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf6x);
 250                 c_refill_threshold =
 251                         (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf6x);
 252         } else if (OCTEON_CN23XX_PF(oct)) {
 253                 struct octeon_config *conf23 = CHIP_CONF(oct, cn23xx_pf);
 254
 255                 c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf23);
 256                 c_refill_threshold = (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf23);
 257         } else if (OCTEON_CN23XX_VF(oct)) {
 258                 struct octeon_config *conf23 = CHIP_CONF(oct, cn23xx_vf);
 259
 260                 c_pkts_per_intr = (u32)CFG_GET_OQ_PKTS_PER_INTR(conf23);
 261                 c_refill_threshold = (u32)CFG_GET_OQ_REFILL_THRESHOLD(conf23);
 262         } else {
 263                 return 1;
 264         }
 265
 266         droq->max_count = c_num_descs;
 267         droq->buffer_size = c_buf_size;
 268
 269         desc_ring_size = droq->max_count * OCT_DROQ_DESC_SIZE;
 270         set_dev_node(&oct->pci_dev->dev, numa_node);
 271         droq->desc_ring = lio_dma_alloc(oct, desc_ring_size,
 272                                         (dma_addr_t *)&droq->desc_ring_dma);
 273         set_dev_node(&oct->pci_dev->dev, orig_node);
 274         if (!droq->desc_ring)
 275                 droq->desc_ring = lio_dma_alloc(oct, desc_ring_size,
 276                                         (dma_addr_t *)&droq->desc_ring_dma);
 277
 278         if (!droq->desc_ring) {
 279                 dev_err(&oct->pci_dev->dev,
 280                         "Output queue %d ring alloc failed\n", q_no);
 281                 return 1;
 282         }
 283
 284         dev_dbg(&oct->pci_dev->dev, "droq[%d]: desc_ring: virt: 0x%p, dma: %lx\n",
 285                 q_no, droq->desc_ring, droq->desc_ring_dma);
 286         dev_dbg(&oct->pci_dev->dev, "droq[%d]: num_desc: %d\n", q_no,
 287                 droq->max_count);
 288
 289         droq->info_list = lio_alloc_info_buffer(oct, droq);
 290         if (!droq->info_list) {
 291                 dev_err(&oct->pci_dev->dev, "Cannot allocate memory for info list.\n");
 292                 lio_dma_free(oct, (droq->max_count * OCT_DROQ_DESC_SIZE),
 293                              droq->desc_ring, droq->desc_ring_dma);
 294                 return 1;
 295         }
 296
 297         droq->recv_buf_list = (struct octeon_recv_buffer *)
 298                               vmalloc_node(droq->max_count *
 299                                                 OCT_DROQ_RECVBUF_SIZE,
 300                                                 numa_node);
 301         if (!droq->recv_buf_list)
 302                 droq->recv_buf_list = (struct octeon_recv_buffer *)
 303                                       vmalloc(droq->max_count *
 304                                                 OCT_DROQ_RECVBUF_SIZE);
 305         if (!droq->recv_buf_list) {
 306                 dev_err(&oct->pci_dev->dev, "Output queue recv buf list alloc failed\n");
 307                 goto init_droq_fail;
 308         }
 309
 310         if (octeon_droq_setup_ring_buffers(oct, droq))
 311                 goto init_droq_fail;
 312
 313         droq->pkts_per_intr = c_pkts_per_intr;
 314         droq->refill_threshold = c_refill_threshold;
 315
 316         dev_dbg(&oct->pci_dev->dev, "DROQ INIT: max_empty_descs: %d\n",
 317                 droq->max_empty_descs);
 318
 319         spin_lock_init(&droq->lock);
 320
 321         INIT_LIST_HEAD(&droq->dispatch_list);
 322
 323         /* For 56xx Pass1, this function won't be called, so no checks. */
 324         oct->fn_list.setup_oq_regs(oct, q_no);
 325
 326         oct->io_qmask.oq |= BIT_ULL(q_no);
 327
 328         return 0;
 329
 330 init_droq_fail:
 331         octeon_delete_droq(oct, q_no);
 332         return 1;
 333 }
 334
 335 /* octeon_create_recv_info
 336  * Parameters:
 337  *  octeon_dev - pointer to the octeon device structure
 338  *  droq       - droq in which the packet arrived.
 339  *  buf_cnt    - no. of buffers used by the packet.
 340  *  idx        - index in the descriptor for the first buffer in the packet.
 341  * Description:
 342  *  Allocates a recv_info_t and copies the buffer addresses for packet data
 343  *  into the recv_pkt space which starts at an 8B offset from recv_info_t.
 344  *  Flags the descriptors for refill later. If available descriptors go
 345  *  below the threshold to receive a 64K pkt, new buffers are first allocated
 346  *  before the recv_pkt_t is created.
 347  *  This routine will be called in interrupt context.
 348  * Returns:
 349  *  Success: Pointer to recv_info_t
 350  *  Failure: NULL.
 351  * Locks:
 352  *  The droq->lock is held when this routine is called.
 353  */
 354 static inline struct octeon_recv_info *octeon_create_recv_info(
 355                 struct octeon_device *octeon_dev,
 356                 struct octeon_droq *droq,
 357                 u32 buf_cnt,
 358                 u32 idx)
 359 {
 360         struct octeon_droq_info *info;
 361         struct octeon_recv_pkt *recv_pkt;
 362         struct octeon_recv_info *recv_info;
 363         u32 i, bytes_left;
 364         struct octeon_skb_page_info *pg_info;
 365
 366         info = &droq->info_list[idx];
 367
 368         recv_info = octeon_alloc_recv_info(sizeof(struct __dispatch));
 369         if (!recv_info)
 370                 return NULL;
 371
 372         recv_pkt = recv_info->recv_pkt;
 373         recv_pkt->rh = info->rh;
 374         recv_pkt->length = (u32)info->length;
 375         recv_pkt->buffer_count = (u16)buf_cnt;
 376         recv_pkt->octeon_id = (u16)octeon_dev->octeon_id;
 377
 378         i = 0;
 379         bytes_left = (u32)info->length;
 380
 381         while (buf_cnt) {
 382                 {
 383                         pg_info = &droq->recv_buf_list[idx].pg_info;
 384
 385                         lio_unmap_ring(octeon_dev->pci_dev,
 386                                        (u64)pg_info->dma);
 387                         pg_info->page = NULL;
 388                         pg_info->dma = 0;
 389                 }
 390
 391                 recv_pkt->buffer_size[i] =
 392                         (bytes_left >=
 393                          droq->buffer_size) ? droq->buffer_size : bytes_left;
 394
 395                 recv_pkt->buffer_ptr[i] = droq->recv_buf_list[idx].buffer;
 396                 droq->recv_buf_list[idx].buffer = NULL;
 397
 398                 idx = incr_index(idx, 1, droq->max_count);
 399                 bytes_left -= droq->buffer_size;
 400                 i++;
 401                 buf_cnt--;
 402         }
 403
 404         return recv_info;
 405 }
 406
 407 /* If we were not able to refill all buffers, try to move around
 408  * the buffers that were not dispatched.
 409  */
 410 static inline u32
 411 octeon_droq_refill_pullup_descs(struct octeon_droq *droq,
 412                                 struct octeon_droq_desc *desc_ring)
 413 {
 414         u32 desc_refilled = 0;
 415
 416         u32 refill_index = droq->refill_idx;
 417
 418         while (refill_index != droq->read_idx) {
 419                 if (droq->recv_buf_list[refill_index].buffer) {
 420                         droq->recv_buf_list[droq->refill_idx].buffer =
 421                                 droq->recv_buf_list[refill_index].buffer;
 422                         droq->recv_buf_list[droq->refill_idx].data =
 423                                 droq->recv_buf_list[refill_index].data;
 424                         desc_ring[droq->refill_idx].buffer_ptr =
 425                                 desc_ring[refill_index].buffer_ptr;
 426                         droq->recv_buf_list[refill_index].buffer = NULL;
 427                         desc_ring[refill_index].buffer_ptr = 0;
 428                         do {
 429                                 droq->refill_idx = incr_index(droq->refill_idx,
 430                                                               1,
 431                                                               droq->max_count);
 432                                 desc_refilled++;
 433                                 droq->refill_count--;
 434                         } while (droq->recv_buf_list[droq->refill_idx].
 435                                  buffer);
 436                 }
 437                 refill_index = incr_index(refill_index, 1, droq->max_count);
 438         }                       /* while */
 439         return desc_refilled;
 440 }
 441
 442 /* octeon_droq_refill
 443  * Parameters:
 444  *  droq       - droq in which descriptors require new buffers.
 445  * Description:
 446  *  Called during normal DROQ processing in interrupt mode or by the poll
 447  *  thread to refill the descriptors from which buffers were dispatched
 448  *  to upper layers. Attempts to allocate new buffers. If that fails, moves
 449  *  up buffers (that were not dispatched) to form a contiguous ring.
 450  * Returns:
 451  *  No of descriptors refilled.
 452  * Locks:
 453  *  This routine is called with droq->lock held.
 454  */
 455 static u32
 456 octeon_droq_refill(struct octeon_device *octeon_dev, struct octeon_droq *droq)
 457 {
 458         struct octeon_droq_desc *desc_ring;
 459         void *buf = NULL;
 460         u8 *data;
 461         u32 desc_refilled = 0;
 462         struct octeon_skb_page_info *pg_info;
 463
 464         desc_ring = droq->desc_ring;
 465
 466         while (droq->refill_count && (desc_refilled < droq->max_count)) {
 467                 /* If a valid buffer exists (happens if there is no dispatch),
 468                  * reuse
 469                  * the buffer, else allocate.
 470                  */
 471                 if (!droq->recv_buf_list[droq->refill_idx].buffer) {
 472                         pg_info =
 473                                 &droq->recv_buf_list[droq->refill_idx].pg_info;
 474                         /* Either recycle the existing pages or go for
 475                          * new page alloc
 476                          */
 477                         if (pg_info->page)
 478                                 buf = recv_buffer_reuse(octeon_dev, pg_info);
 479                         else
 480                                 buf = recv_buffer_alloc(octeon_dev, pg_info);
 481                         /* If a buffer could not be allocated, no point in
 482                          * continuing
 483                          */
 484                         if (!buf) {
 485                                 droq->stats.rx_alloc_failure++;
 486                                 break;
 487                         }
 488                         droq->recv_buf_list[droq->refill_idx].buffer =
 489                                 buf;
 490                         data = get_rbd(buf);
 491                 } else {
 492                         data = get_rbd(droq->recv_buf_list
 493                                        [droq->refill_idx].buffer);
 494                 }
 495
 496                 droq->recv_buf_list[droq->refill_idx].data = data;
 497
 498                 desc_ring[droq->refill_idx].buffer_ptr =
 499                         lio_map_ring(droq->recv_buf_list[droq->
 500                                      refill_idx].buffer);
 501                 /* Reset any previous values in the length field. */
 502                 droq->info_list[droq->refill_idx].length = 0;
 503
 504                 droq->refill_idx = incr_index(droq->refill_idx, 1,
 505                                               droq->max_count);
 506                 desc_refilled++;
 507                 droq->refill_count--;
 508         }
 509
 510         if (droq->refill_count)
 511                 desc_refilled +=
 512                         octeon_droq_refill_pullup_descs(droq, desc_ring);
 513
 514         /* if droq->refill_count
 515          * The refill count would not change in pass two. We only moved buffers
 516          * to close the gap in the ring, but we would still have the same no. of
 517          * buffers to refill.
 518          */
 519         return desc_refilled;
 520 }
 521
 522 static inline u32
 523 octeon_droq_get_bufcount(u32 buf_size, u32 total_len)
 524 {
 525         u32 buf_cnt = 0;
 526
 527         while (total_len > (buf_size * buf_cnt))
 528                 buf_cnt++;
 529         return buf_cnt;
 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 = &droq->info_list[droq->read_idx];
 578                 octeon_swap_8B_data((u64 *)info, 2);
 579
 580                 if (info->length) {
 581                         info->length -= OCT_RH_SIZE;
 582                         droq->stats.bytes_received += info->length;
 583                         buf_cnt = octeon_droq_get_bufcount(droq->buffer_size,
 584                                                            (u32)info->length);
 585                 } else {
 586                         dev_err(&oct->pci_dev->dev, "DROQ: In drop: pkt with len 0\n");
 587                         buf_cnt = 1;
 588                 }
 589
 590                 droq->read_idx = incr_index(droq->read_idx, buf_cnt,
 591                                             droq->max_count);
 592                 droq->refill_count += buf_cnt;
 593         }
 594 }
 595
 596 static u32
 597 octeon_droq_fast_process_packets(struct octeon_device *oct,
 598                                  struct octeon_droq *droq,
 599                                  u32 pkts_to_process)
 600 {
 601         struct octeon_droq_info *info;
 602         union octeon_rh *rh;
 603         u32 pkt, total_len = 0, pkt_count;
 604
 605         pkt_count = pkts_to_process;
 606
 607         for (pkt = 0; pkt < pkt_count; pkt++) {
 608                 u32 pkt_len = 0;
 609                 struct sk_buff *nicbuf = NULL;
 610                 struct octeon_skb_page_info *pg_info;
 611                 void *buf;
 612
 613                 info = &droq->info_list[droq->read_idx];
 614                 octeon_swap_8B_data((u64 *)info, 2);
 615
 616                 if (!info->length) {
 617                         dev_err(&oct->pci_dev->dev,
 618                                 "DROQ[%d] idx: %d len:0, pkt_cnt: %d\n",
 619                                 droq->q_no, droq->read_idx, pkt_count);
 620                         print_hex_dump_bytes("", DUMP_PREFIX_ADDRESS,
 621                                              (u8 *)info,
 622                                              OCT_DROQ_INFO_SIZE);
 623                         break;
 624                 }
 625
 626                 /* Len of resp hdr in included in the received data len. */
 627                 info->length -= OCT_RH_SIZE;
 628                 rh = &info->rh;
 629
 630                 total_len += (u32)info->length;
 631                 if (opcode_slow_path(rh)) {
 632                         u32 buf_cnt;
 633
 634                         buf_cnt = octeon_droq_dispatch_pkt(oct, droq, rh, info);
 635                         droq->read_idx = incr_index(droq->read_idx,
 636                                                     buf_cnt, droq->max_count);
 637                         droq->refill_count += buf_cnt;
 638                 } else {
 639                         if (info->length <= droq->buffer_size) {
 640                                 pkt_len = (u32)info->length;
 641                                 nicbuf = droq->recv_buf_list[
 642                                         droq->read_idx].buffer;
 643                                 pg_info = &droq->recv_buf_list[
 644                                         droq->read_idx].pg_info;
 645                                 if (recv_buffer_recycle(oct, pg_info))
 646                                         pg_info->page = NULL;
 647                                 droq->recv_buf_list[droq->read_idx].buffer =
 648                                         NULL;
 649
 650                                 droq->read_idx = incr_index(droq->read_idx, 1,
 651                                                             droq->max_count);
 652                                 droq->refill_count++;
 653                         } else {
 654                                 nicbuf = octeon_fast_packet_alloc((u32)
 655                                                                   info->length);
 656                                 pkt_len = 0;
 657                                 /* nicbuf allocation can fail. We'll handle it
 658                                  * inside the loop.
 659                                  */
 660                                 while (pkt_len < info->length) {
 661                                         int cpy_len, idx = droq->read_idx;
 662
 663                                         cpy_len = ((pkt_len + droq->buffer_size)
 664                                                    > info->length) ?
 665                                                 ((u32)info->length - pkt_len) :
 666                                                 droq->buffer_size;
 667
 668                                         if (nicbuf) {
 669                                                 octeon_fast_packet_next(droq,
 670                                                                         nicbuf,
 671                                                                         cpy_len,
 672                                                                         idx);
 673                                                 buf = droq->recv_buf_list[idx].
 674                                                         buffer;
 675                                                 recv_buffer_fast_free(buf);
 676                                                 droq->recv_buf_list[idx].buffer
 677                                                         = NULL;
 678                                         } else {
 679                                                 droq->stats.rx_alloc_failure++;
 680                                         }
 681
 682                                         pkt_len += cpy_len;
 683                                         droq->read_idx =
 684                                                 incr_index(droq->read_idx, 1,
 685                                                            droq->max_count);
 686                                         droq->refill_count++;
 687                                 }
 688                         }
 689
 690                         if (nicbuf) {
 691                                 if (droq->ops.fptr) {
 692                                         droq->ops.fptr(oct->octeon_id,
 693                                                        nicbuf, pkt_len,
 694                                                        rh, &droq->napi,
 695                                                        droq->ops.farg);
 696                                 } else {
 697                                         recv_buffer_free(nicbuf);
 698                                 }
 699                         }
 700                 }
 701
 702                 if (droq->refill_count >= droq->refill_threshold) {
 703                         int desc_refilled = octeon_droq_refill(oct, droq);
 704
 705                         /* Flush the droq descriptor data to memory to be sure
 706                          * that when we update the credits the data in memory
 707                          * is accurate.
 708                          */
 709                         wmb();
 710                         writel((desc_refilled), droq->pkts_credit_reg);
 711                         /* make sure mmio write completes */
 712                         mmiowb();
 713                 }
 714
 715         }                       /* for (each packet)... */
 716
 717         /* Increment refill_count by the number of buffers processed. */
 718         droq->stats.pkts_received += pkt;
 719         droq->stats.bytes_received += total_len;
 720
 721         if ((droq->ops.drop_on_max) && (pkts_to_process - pkt)) {
 722                 octeon_droq_drop_packets(oct, droq, (pkts_to_process - pkt));
 723
 724                 droq->stats.dropped_toomany += (pkts_to_process - pkt);
 725                 return pkts_to_process;
 726         }
 727
 728         return pkt;
 729 }
 730
 731 int
 732 octeon_droq_process_packets(struct octeon_device *oct,
 733                             struct octeon_droq *droq,
 734                             u32 budget)
 735 {
 736         u32 pkt_count = 0, pkts_processed = 0;
 737         struct list_head *tmp, *tmp2;
 738
 739         /* Grab the droq lock */
 740         spin_lock(&droq->lock);
 741
 742         octeon_droq_check_hw_for_pkts(droq);
 743         pkt_count = atomic_read(&droq->pkts_pending);
 744
 745         if (!pkt_count) {
 746                 spin_unlock(&droq->lock);
 747                 return 0;
 748         }
 749
 750         if (pkt_count > budget)
 751                 pkt_count = budget;
 752
 753         pkts_processed = octeon_droq_fast_process_packets(oct, droq, pkt_count);
 754
 755         atomic_sub(pkts_processed, &droq->pkts_pending);
 756
 757         /* Release the spin lock */
 758         spin_unlock(&droq->lock);
 759
 760         list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 761                 struct __dispatch *rdisp = (struct __dispatch *)tmp;
 762
 763                 list_del(tmp);
 764                 rdisp->disp_fn(rdisp->rinfo,
 765                                octeon_get_dispatch_arg
 766                                (oct,
 767                                 (u16)rdisp->rinfo->recv_pkt->rh.r.opcode,
 768                                 (u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 769         }
 770
 771         /* If there are packets pending. schedule tasklet again */
 772         if (atomic_read(&droq->pkts_pending))
 773                 return 1;
 774
 775         return 0;
 776 }
 777
 778 /**
 779  * Utility function to poll for packets. check_hw_for_packets must be
 780  * called before calling this routine.
 781  */
 782
 783 static int
 784 octeon_droq_process_poll_pkts(struct octeon_device *oct,
 785                               struct octeon_droq *droq, u32 budget)
 786 {
 787         struct list_head *tmp, *tmp2;
 788         u32 pkts_available = 0, pkts_processed = 0;
 789         u32 total_pkts_processed = 0;
 790
 791         if (budget > droq->max_count)
 792                 budget = droq->max_count;
 793
 794         spin_lock(&droq->lock);
 795
 796         while (total_pkts_processed < budget) {
 797                 octeon_droq_check_hw_for_pkts(droq);
 798
 799                 pkts_available = min((budget - total_pkts_processed),
 800                                      (u32)(atomic_read(&droq->pkts_pending)));
 801
 802                 if (pkts_available == 0)
 803                         break;
 804
 805                 pkts_processed =
 806                         octeon_droq_fast_process_packets(oct, droq,
 807                                                          pkts_available);
 808
 809                 atomic_sub(pkts_processed, &droq->pkts_pending);
 810
 811                 total_pkts_processed += pkts_processed;
 812         }
 813
 814         spin_unlock(&droq->lock);
 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 int
 831 octeon_process_droq_poll_cmd(struct octeon_device *oct, u32 q_no, int cmd,
 832                              u32 arg)
 833 {
 834         struct octeon_droq *droq;
 835
 836         droq = oct->droq[q_no];
 837
 838         if (cmd == POLL_EVENT_PROCESS_PKTS)
 839                 return octeon_droq_process_poll_pkts(oct, droq, arg);
 840
 841         if (cmd == POLL_EVENT_PENDING_PKTS) {
 842                 u32 pkt_cnt = atomic_read(&droq->pkts_pending);
 843
 844                 return  octeon_droq_process_packets(oct, droq, pkt_cnt);
 845         }
 846
 847         if (cmd == POLL_EVENT_ENABLE_INTR) {
 848                 u32 value;
 849                 unsigned long flags;
 850
 851                 /* Enable Pkt Interrupt */
 852                 switch (oct->chip_id) {
 853                 case OCTEON_CN66XX:
 854                 case OCTEON_CN68XX: {
 855                         struct octeon_cn6xxx *cn6xxx =
 856                                 (struct octeon_cn6xxx *)oct->chip;
 857                         spin_lock_irqsave
 858                                 (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 859                         value =
 860                                 octeon_read_csr(oct,
 861                                                 CN6XXX_SLI_PKT_TIME_INT_ENB);
 862                         value |= (1 << q_no);
 863                         octeon_write_csr(oct,
 864                                          CN6XXX_SLI_PKT_TIME_INT_ENB,
 865                                          value);
 866                         value =
 867                                 octeon_read_csr(oct,
 868                                                 CN6XXX_SLI_PKT_CNT_INT_ENB);
 869                         value |= (1 << q_no);
 870                         octeon_write_csr(oct,
 871                                          CN6XXX_SLI_PKT_CNT_INT_ENB,
 872                                          value);
 873
 874                         /* don't bother flushing the enables */
 875
 876                         spin_unlock_irqrestore
 877                                 (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 878                         return 0;
 879                 }
 880                 break;
 881                 case OCTEON_CN23XX_PF_VID: {
 882                         lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 883                 }
 884                 break;
 885
 886                 case OCTEON_CN23XX_VF_VID:
 887                         lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 888                 break;
 889                 }
 890                 return 0;
 891         }
 892
 893         dev_err(&oct->pci_dev->dev, "%s Unknown command: %d\n", __func__, cmd);
 894         return -EINVAL;
 895 }
 896
 897 int octeon_register_droq_ops(struct octeon_device *oct, u32 q_no,
 898                              struct octeon_droq_ops *ops)
 899 {
 900         struct octeon_droq *droq;
 901         unsigned long flags;
 902         struct octeon_config *oct_cfg = NULL;
 903
 904         oct_cfg = octeon_get_conf(oct);
 905
 906         if (!oct_cfg)
 907                 return -EINVAL;
 908
 909         if (!(ops)) {
 910                 dev_err(&oct->pci_dev->dev, "%s: droq_ops pointer is NULL\n",
 911                         __func__);
 912                 return -EINVAL;
 913         }
 914
 915         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 916                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 917                         __func__, q_no, (oct->num_oqs - 1));
 918                 return -EINVAL;
 919         }
 920
 921         droq = oct->droq[q_no];
 922
 923         spin_lock_irqsave(&droq->lock, flags);
 924
 925         memcpy(&droq->ops, ops, sizeof(struct octeon_droq_ops));
 926
 927         spin_unlock_irqrestore(&droq->lock, flags);
 928
 929         return 0;
 930 }
 931
 932 int octeon_unregister_droq_ops(struct octeon_device *oct, u32 q_no)
 933 {
 934         unsigned long flags;
 935         struct octeon_droq *droq;
 936         struct octeon_config *oct_cfg = NULL;
 937
 938         oct_cfg = octeon_get_conf(oct);
 939
 940         if (!oct_cfg)
 941                 return -EINVAL;
 942
 943         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 944                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 945                         __func__, q_no, oct->num_oqs - 1);
 946                 return -EINVAL;
 947         }
 948
 949         droq = oct->droq[q_no];
 950
 951         if (!droq) {
 952                 dev_info(&oct->pci_dev->dev,
 953                          "Droq id (%d) not available.\n", q_no);
 954                 return 0;
 955         }
 956
 957         spin_lock_irqsave(&droq->lock, flags);
 958
 959         droq->ops.fptr = NULL;
 960         droq->ops.farg = NULL;
 961         droq->ops.drop_on_max = 0;
 962
 963         spin_unlock_irqrestore(&droq->lock, flags);
 964
 965         return 0;
 966 }
 967
 968 int octeon_create_droq(struct octeon_device *oct,
 969                        u32 q_no, u32 num_descs,
 970                        u32 desc_size, void *app_ctx)
 971 {
 972         struct octeon_droq *droq;
 973         int numa_node = cpu_to_node(q_no % num_online_cpus());
 974
 975         if (oct->droq[q_no]) {
 976                 dev_dbg(&oct->pci_dev->dev, "Droq already in use. Cannot create droq %d again\n",
 977                         q_no);
 978                 return 1;
 979         }
 980
 981         /* Allocate the DS for the new droq. */
 982         droq = vmalloc_node(sizeof(*droq), numa_node);
 983         if (!droq)
 984                 droq = vmalloc(sizeof(*droq));
 985         if (!droq)
 986                 return -1;
 987
 988         memset(droq, 0, sizeof(struct octeon_droq));
 989
 990         /*Disable the pkt o/p for this Q  */
 991         octeon_set_droq_pkt_op(oct, q_no, 0);
 992         oct->droq[q_no] = droq;
 993
 994         /* Initialize the Droq */
 995         if (octeon_init_droq(oct, q_no, num_descs, desc_size, app_ctx)) {
 996                 vfree(oct->droq[q_no]);
 997                 oct->droq[q_no] = NULL;
 998                 return -1;
 999         }
1000
1001         oct->num_oqs++;
1002
1003         dev_dbg(&oct->pci_dev->dev, "%s: Total number of OQ: %d\n", __func__,
1004                 oct->num_oqs);
1005
1006         /* Global Droq register settings */
1007
1008         /* As of now not required, as setting are done for all 32 Droqs at
1009          * the same time.
1010          */
1011         return 0;
1012 }