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         spin_lock_init(&droq->lock);
 305
 306         INIT_LIST_HEAD(&droq->dispatch_list);
 307
 308         /* For 56xx Pass1, this function won't be called, so no checks. */
 309         oct->fn_list.setup_oq_regs(oct, q_no);
 310
 311         oct->io_qmask.oq |= BIT_ULL(q_no);
 312
 313         return 0;
 314
 315 init_droq_fail:
 316         octeon_delete_droq(oct, q_no);
 317         return 1;
 318 }
 319
 320 /* octeon_create_recv_info
 321  * Parameters:
 322  *  octeon_dev - pointer to the octeon device structure
 323  *  droq       - droq in which the packet arrived.
 324  *  buf_cnt    - no. of buffers used by the packet.
 325  *  idx        - index in the descriptor for the first buffer in the packet.
 326  * Description:
 327  *  Allocates a recv_info_t and copies the buffer addresses for packet data
 328  *  into the recv_pkt space which starts at an 8B offset from recv_info_t.
 329  *  Flags the descriptors for refill later. If available descriptors go
 330  *  below the threshold to receive a 64K pkt, new buffers are first allocated
 331  *  before the recv_pkt_t is created.
 332  *  This routine will be called in interrupt context.
 333  * Returns:
 334  *  Success: Pointer to recv_info_t
 335  *  Failure: NULL.
 336  * Locks:
 337  *  The droq->lock is held when this routine is called.
 338  */
 339 static inline struct octeon_recv_info *octeon_create_recv_info(
 340                 struct octeon_device *octeon_dev,
 341                 struct octeon_droq *droq,
 342                 u32 buf_cnt,
 343                 u32 idx)
 344 {
 345         struct octeon_droq_info *info;
 346         struct octeon_recv_pkt *recv_pkt;
 347         struct octeon_recv_info *recv_info;
 348         u32 i, bytes_left;
 349         struct octeon_skb_page_info *pg_info;
 350
 351         info = (struct octeon_droq_info *)droq->recv_buf_list[idx].data;
 352
 353         recv_info = octeon_alloc_recv_info(sizeof(struct __dispatch));
 354         if (!recv_info)
 355                 return NULL;
 356
 357         recv_pkt = recv_info->recv_pkt;
 358         recv_pkt->rh = info->rh;
 359         recv_pkt->length = (u32)info->length;
 360         recv_pkt->buffer_count = (u16)buf_cnt;
 361         recv_pkt->octeon_id = (u16)octeon_dev->octeon_id;
 362
 363         i = 0;
 364         bytes_left = (u32)info->length;
 365
 366         while (buf_cnt) {
 367                 {
 368                         pg_info = &droq->recv_buf_list[idx].pg_info;
 369
 370                         lio_unmap_ring(octeon_dev->pci_dev,
 371                                        (u64)pg_info->dma);
 372                         pg_info->page = NULL;
 373                         pg_info->dma = 0;
 374                 }
 375
 376                 recv_pkt->buffer_size[i] =
 377                         (bytes_left >=
 378                          droq->buffer_size) ? droq->buffer_size : bytes_left;
 379
 380                 recv_pkt->buffer_ptr[i] = droq->recv_buf_list[idx].buffer;
 381                 droq->recv_buf_list[idx].buffer = NULL;
 382
 383                 idx = incr_index(idx, 1, droq->max_count);
 384                 bytes_left -= droq->buffer_size;
 385                 i++;
 386                 buf_cnt--;
 387         }
 388
 389         return recv_info;
 390 }
 391
 392 /* If we were not able to refill all buffers, try to move around
 393  * the buffers that were not dispatched.
 394  */
 395 static inline u32
 396 octeon_droq_refill_pullup_descs(struct octeon_droq *droq,
 397                                 struct octeon_droq_desc *desc_ring)
 398 {
 399         u32 desc_refilled = 0;
 400
 401         u32 refill_index = droq->refill_idx;
 402
 403         while (refill_index != droq->read_idx) {
 404                 if (droq->recv_buf_list[refill_index].buffer) {
 405                         droq->recv_buf_list[droq->refill_idx].buffer =
 406                                 droq->recv_buf_list[refill_index].buffer;
 407                         droq->recv_buf_list[droq->refill_idx].data =
 408                                 droq->recv_buf_list[refill_index].data;
 409                         desc_ring[droq->refill_idx].buffer_ptr =
 410                                 desc_ring[refill_index].buffer_ptr;
 411                         droq->recv_buf_list[refill_index].buffer = NULL;
 412                         desc_ring[refill_index].buffer_ptr = 0;
 413                         do {
 414                                 droq->refill_idx = incr_index(droq->refill_idx,
 415                                                               1,
 416                                                               droq->max_count);
 417                                 desc_refilled++;
 418                                 droq->refill_count--;
 419                         } while (droq->recv_buf_list[droq->refill_idx].buffer);
 420                 }
 421                 refill_index = incr_index(refill_index, 1, droq->max_count);
 422         }                       /* while */
 423         return desc_refilled;
 424 }
 425
 426 /* octeon_droq_refill
 427  * Parameters:
 428  *  droq       - droq in which descriptors require new buffers.
 429  * Description:
 430  *  Called during normal DROQ processing in interrupt mode or by the poll
 431  *  thread to refill the descriptors from which buffers were dispatched
 432  *  to upper layers. Attempts to allocate new buffers. If that fails, moves
 433  *  up buffers (that were not dispatched) to form a contiguous ring.
 434  * Returns:
 435  *  No of descriptors refilled.
 436  * Locks:
 437  *  This routine is called with droq->lock held.
 438  */
 439 static u32
 440 octeon_droq_refill(struct octeon_device *octeon_dev, struct octeon_droq *droq)
 441 {
 442         struct octeon_droq_desc *desc_ring;
 443         void *buf = NULL;
 444         u8 *data;
 445         u32 desc_refilled = 0;
 446         struct octeon_skb_page_info *pg_info;
 447
 448         desc_ring = droq->desc_ring;
 449
 450         while (droq->refill_count && (desc_refilled < droq->max_count)) {
 451                 /* If a valid buffer exists (happens if there is no dispatch),
 452                  * reuse
 453                  * the buffer, else allocate.
 454                  */
 455                 if (!droq->recv_buf_list[droq->refill_idx].buffer) {
 456                         pg_info =
 457                                 &droq->recv_buf_list[droq->refill_idx].pg_info;
 458                         /* Either recycle the existing pages or go for
 459                          * new page alloc
 460                          */
 461                         if (pg_info->page)
 462                                 buf = recv_buffer_reuse(octeon_dev, pg_info);
 463                         else
 464                                 buf = recv_buffer_alloc(octeon_dev, pg_info);
 465                         /* If a buffer could not be allocated, no point in
 466                          * continuing
 467                          */
 468                         if (!buf) {
 469                                 droq->stats.rx_alloc_failure++;
 470                                 break;
 471                         }
 472                         droq->recv_buf_list[droq->refill_idx].buffer =
 473                                 buf;
 474                         data = get_rbd(buf);
 475                 } else {
 476                         data = get_rbd(droq->recv_buf_list
 477                                        [droq->refill_idx].buffer);
 478                 }
 479
 480                 droq->recv_buf_list[droq->refill_idx].data = data;
 481
 482                 desc_ring[droq->refill_idx].buffer_ptr =
 483                         lio_map_ring(droq->recv_buf_list[
 484                                      droq->refill_idx].buffer);
 485
 486                 droq->refill_idx = incr_index(droq->refill_idx, 1,
 487                                               droq->max_count);
 488                 desc_refilled++;
 489                 droq->refill_count--;
 490         }
 491
 492         if (droq->refill_count)
 493                 desc_refilled +=
 494                         octeon_droq_refill_pullup_descs(droq, desc_ring);
 495
 496         /* if droq->refill_count
 497          * The refill count would not change in pass two. We only moved buffers
 498          * to close the gap in the ring, but we would still have the same no. of
 499          * buffers to refill.
 500          */
 501         return desc_refilled;
 502 }
 503
 504 /** check if we can allocate packets to get out of oom.
 505  *  @param  droq - Droq being checked.
 506  *  @return does not return anything
 507  */
 508 void octeon_droq_check_oom(struct octeon_droq *droq)
 509 {
 510         int desc_refilled;
 511         struct octeon_device *oct = droq->oct_dev;
 512
 513         if (readl(droq->pkts_credit_reg) <= CN23XX_SLI_DEF_BP) {
 514                 spin_lock_bh(&droq->lock);
 515                 desc_refilled = octeon_droq_refill(oct, droq);
 516                 if (desc_refilled) {
 517                         /* Flush the droq descriptor data to memory to be sure
 518                          * that when we update the credits the data in memory
 519                          * is accurate.
 520                          */
 521                         wmb();
 522                         writel(desc_refilled, droq->pkts_credit_reg);
 523                         /* make sure mmio write completes */
 524                         mmiowb();
 525                 }
 526                 spin_unlock_bh(&droq->lock);
 527         }
 528 }
 529
 530 static inline u32
 531 octeon_droq_get_bufcount(u32 buf_size, u32 total_len)
 532 {
 533         return ((total_len + buf_size - 1) / buf_size);
 534 }
 535
 536 static int
 537 octeon_droq_dispatch_pkt(struct octeon_device *oct,
 538                          struct octeon_droq *droq,
 539                          union octeon_rh *rh,
 540                          struct octeon_droq_info *info)
 541 {
 542         u32 cnt;
 543         octeon_dispatch_fn_t disp_fn;
 544         struct octeon_recv_info *rinfo;
 545
 546         cnt = octeon_droq_get_bufcount(droq->buffer_size, (u32)info->length);
 547
 548         disp_fn = octeon_get_dispatch(oct, (u16)rh->r.opcode,
 549                                       (u16)rh->r.subcode);
 550         if (disp_fn) {
 551                 rinfo = octeon_create_recv_info(oct, droq, cnt, droq->read_idx);
 552                 if (rinfo) {
 553                         struct __dispatch *rdisp = rinfo->rsvd;
 554
 555                         rdisp->rinfo = rinfo;
 556                         rdisp->disp_fn = disp_fn;
 557                         rinfo->recv_pkt->rh = *rh;
 558                         list_add_tail(&rdisp->list,
 559                                       &droq->dispatch_list);
 560                 } else {
 561                         droq->stats.dropped_nomem++;
 562                 }
 563         } else {
 564                 dev_err(&oct->pci_dev->dev, "DROQ: No dispatch function (opcode %u/%u)\n",
 565                         (unsigned int)rh->r.opcode,
 566                         (unsigned int)rh->r.subcode);
 567                 droq->stats.dropped_nodispatch++;
 568         }
 569
 570         return cnt;
 571 }
 572
 573 static inline void octeon_droq_drop_packets(struct octeon_device *oct,
 574                                             struct octeon_droq *droq,
 575                                             u32 cnt)
 576 {
 577         u32 i = 0, buf_cnt;
 578         struct octeon_droq_info *info;
 579
 580         for (i = 0; i < cnt; i++) {
 581                 info = (struct octeon_droq_info *)
 582                         droq->recv_buf_list[droq->read_idx].data;
 583                 octeon_swap_8B_data((u64 *)info, 2);
 584
 585                 if (info->length) {
 586                         info->length += OCTNET_FRM_LENGTH_SIZE;
 587                         droq->stats.bytes_received += info->length;
 588                         buf_cnt = octeon_droq_get_bufcount(droq->buffer_size,
 589                                                            (u32)info->length);
 590                 } else {
 591                         dev_err(&oct->pci_dev->dev, "DROQ: In drop: pkt with len 0\n");
 592                         buf_cnt = 1;
 593                 }
 594
 595                 droq->read_idx = incr_index(droq->read_idx, buf_cnt,
 596                                             droq->max_count);
 597                 droq->refill_count += buf_cnt;
 598         }
 599 }
 600
 601 static u32
 602 octeon_droq_fast_process_packets(struct octeon_device *oct,
 603                                  struct octeon_droq *droq,
 604                                  u32 pkts_to_process)
 605 {
 606         struct octeon_droq_info *info;
 607         union octeon_rh *rh;
 608         u32 pkt, total_len = 0, pkt_count;
 609
 610         pkt_count = pkts_to_process;
 611
 612         for (pkt = 0; pkt < pkt_count; pkt++) {
 613                 u32 pkt_len = 0;
 614                 struct sk_buff *nicbuf = NULL;
 615                 struct octeon_skb_page_info *pg_info;
 616                 void *buf;
 617
 618                 info = (struct octeon_droq_info *)
 619                         droq->recv_buf_list[droq->read_idx].data;
 620                 octeon_swap_8B_data((u64 *)info, 2);
 621
 622                 if (!info->length) {
 623                         dev_err(&oct->pci_dev->dev,
 624                                 "DROQ[%d] idx: %d len:0, pkt_cnt: %d\n",
 625                                 droq->q_no, droq->read_idx, pkt_count);
 626                         print_hex_dump_bytes("", DUMP_PREFIX_ADDRESS,
 627                                              (u8 *)info,
 628                                              OCT_DROQ_INFO_SIZE);
 629                         break;
 630                 }
 631
 632                 /* Len of resp hdr in included in the received data len. */
 633                 rh = &info->rh;
 634
 635                 info->length += OCTNET_FRM_LENGTH_SIZE;
 636                 rh->r_dh.len += (ROUNDUP8(OCT_DROQ_INFO_SIZE) / sizeof(u64));
 637                 total_len += (u32)info->length;
 638                 if (opcode_slow_path(rh)) {
 639                         u32 buf_cnt;
 640
 641                         buf_cnt = octeon_droq_dispatch_pkt(oct, droq, rh, info);
 642                         droq->read_idx = incr_index(droq->read_idx,
 643                                                     buf_cnt, droq->max_count);
 644                         droq->refill_count += buf_cnt;
 645                 } else {
 646                         if (info->length <= droq->buffer_size) {
 647                                 pkt_len = (u32)info->length;
 648                                 nicbuf = droq->recv_buf_list[
 649                                         droq->read_idx].buffer;
 650                                 pg_info = &droq->recv_buf_list[
 651                                         droq->read_idx].pg_info;
 652                                 if (recv_buffer_recycle(oct, pg_info))
 653                                         pg_info->page = NULL;
 654                                 droq->recv_buf_list[droq->read_idx].buffer =
 655                                         NULL;
 656
 657                                 droq->read_idx = incr_index(droq->read_idx, 1,
 658                                                             droq->max_count);
 659                                 droq->refill_count++;
 660                         } else {
 661                                 nicbuf = octeon_fast_packet_alloc((u32)
 662                                                                   info->length);
 663                                 pkt_len = 0;
 664                                 /* nicbuf allocation can fail. We'll handle it
 665                                  * inside the loop.
 666                                  */
 667                                 while (pkt_len < info->length) {
 668                                         int cpy_len, idx = droq->read_idx;
 669
 670                                         cpy_len = ((pkt_len + droq->buffer_size)
 671                                                    > info->length) ?
 672                                                 ((u32)info->length - pkt_len) :
 673                                                 droq->buffer_size;
 674
 675                                         if (nicbuf) {
 676                                                 octeon_fast_packet_next(droq,
 677                                                                         nicbuf,
 678                                                                         cpy_len,
 679                                                                         idx);
 680                                                 buf = droq->recv_buf_list[
 681                                                         idx].buffer;
 682                                                 recv_buffer_fast_free(buf);
 683                                                 droq->recv_buf_list[idx].buffer
 684                                                         = NULL;
 685                                         } else {
 686                                                 droq->stats.rx_alloc_failure++;
 687                                         }
 688
 689                                         pkt_len += cpy_len;
 690                                         droq->read_idx =
 691                                                 incr_index(droq->read_idx, 1,
 692                                                            droq->max_count);
 693                                         droq->refill_count++;
 694                                 }
 695                         }
 696
 697                         if (nicbuf) {
 698                                 if (droq->ops.fptr) {
 699                                         droq->ops.fptr(oct->octeon_id,
 700                                                        nicbuf, pkt_len,
 701                                                        rh, &droq->napi,
 702                                                        droq->ops.farg);
 703                                 } else {
 704                                         recv_buffer_free(nicbuf);
 705                                 }
 706                         }
 707                 }
 708
 709                 if (droq->refill_count >= droq->refill_threshold) {
 710                         int desc_refilled = octeon_droq_refill(oct, droq);
 711
 712                         /* Flush the droq descriptor data to memory to be sure
 713                          * that when we update the credits the data in memory
 714                          * is accurate.
 715                          */
 716                         wmb();
 717                         writel((desc_refilled), droq->pkts_credit_reg);
 718                         /* make sure mmio write completes */
 719                         mmiowb();
 720                 }
 721
 722         }                       /* for (each packet)... */
 723
 724         /* Increment refill_count by the number of buffers processed. */
 725         droq->stats.pkts_received += pkt;
 726         droq->stats.bytes_received += total_len;
 727
 728         if ((droq->ops.drop_on_max) && (pkts_to_process - pkt)) {
 729                 octeon_droq_drop_packets(oct, droq, (pkts_to_process - pkt));
 730
 731                 droq->stats.dropped_toomany += (pkts_to_process - pkt);
 732                 return pkts_to_process;
 733         }
 734
 735         return pkt;
 736 }
 737
 738 int
 739 octeon_droq_process_packets(struct octeon_device *oct,
 740                             struct octeon_droq *droq,
 741                             u32 budget)
 742 {
 743         u32 pkt_count = 0, pkts_processed = 0;
 744         struct list_head *tmp, *tmp2;
 745
 746         /* Grab the droq lock */
 747         spin_lock(&droq->lock);
 748
 749         octeon_droq_check_hw_for_pkts(droq);
 750         pkt_count = atomic_read(&droq->pkts_pending);
 751
 752         if (!pkt_count) {
 753                 spin_unlock(&droq->lock);
 754                 return 0;
 755         }
 756
 757         if (pkt_count > budget)
 758                 pkt_count = budget;
 759
 760         pkts_processed = octeon_droq_fast_process_packets(oct, droq, pkt_count);
 761
 762         atomic_sub(pkts_processed, &droq->pkts_pending);
 763
 764         /* Release the spin lock */
 765         spin_unlock(&droq->lock);
 766
 767         list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 768                 struct __dispatch *rdisp = (struct __dispatch *)tmp;
 769
 770                 list_del(tmp);
 771                 rdisp->disp_fn(rdisp->rinfo,
 772                                octeon_get_dispatch_arg
 773                                (oct,
 774                                 (u16)rdisp->rinfo->recv_pkt->rh.r.opcode,
 775                                 (u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 776         }
 777
 778         /* If there are packets pending. schedule tasklet again */
 779         if (atomic_read(&droq->pkts_pending))
 780                 return 1;
 781
 782         return 0;
 783 }
 784
 785 /**
 786  * Utility function to poll for packets. check_hw_for_packets must be
 787  * called before calling this routine.
 788  */
 789
 790 int
 791 octeon_droq_process_poll_pkts(struct octeon_device *oct,
 792                               struct octeon_droq *droq, u32 budget)
 793 {
 794         struct list_head *tmp, *tmp2;
 795         u32 pkts_available = 0, pkts_processed = 0;
 796         u32 total_pkts_processed = 0;
 797
 798         if (budget > droq->max_count)
 799                 budget = droq->max_count;
 800
 801         spin_lock(&droq->lock);
 802
 803         while (total_pkts_processed < budget) {
 804                 octeon_droq_check_hw_for_pkts(droq);
 805
 806                 pkts_available = min((budget - total_pkts_processed),
 807                                      (u32)(atomic_read(&droq->pkts_pending)));
 808
 809                 if (pkts_available == 0)
 810                         break;
 811
 812                 pkts_processed =
 813                         octeon_droq_fast_process_packets(oct, droq,
 814                                                          pkts_available);
 815
 816                 atomic_sub(pkts_processed, &droq->pkts_pending);
 817
 818                 total_pkts_processed += pkts_processed;
 819         }
 820
 821         spin_unlock(&droq->lock);
 822
 823         list_for_each_safe(tmp, tmp2, &droq->dispatch_list) {
 824                 struct __dispatch *rdisp = (struct __dispatch *)tmp;
 825
 826                 list_del(tmp);
 827                 rdisp->disp_fn(rdisp->rinfo,
 828                                octeon_get_dispatch_arg
 829                                (oct,
 830                                 (u16)rdisp->rinfo->recv_pkt->rh.r.opcode,
 831                                 (u16)rdisp->rinfo->recv_pkt->rh.r.subcode));
 832         }
 833
 834         return total_pkts_processed;
 835 }
 836
 837 /* Enable Pkt Interrupt */
 838 int
 839 octeon_enable_irq(struct octeon_device *oct, u32 q_no)
 840 {
 841         switch (oct->chip_id) {
 842         case OCTEON_CN66XX:
 843         case OCTEON_CN68XX: {
 844                 struct octeon_cn6xxx *cn6xxx =
 845                         (struct octeon_cn6xxx *)oct->chip;
 846                 unsigned long flags;
 847                 u32 value;
 848
 849                 spin_lock_irqsave
 850                         (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 851                 value = octeon_read_csr(oct, CN6XXX_SLI_PKT_TIME_INT_ENB);
 852                 value |= (1 << q_no);
 853                 octeon_write_csr(oct, CN6XXX_SLI_PKT_TIME_INT_ENB, value);
 854                 value = octeon_read_csr(oct, CN6XXX_SLI_PKT_CNT_INT_ENB);
 855                 value |= (1 << q_no);
 856                 octeon_write_csr(oct, CN6XXX_SLI_PKT_CNT_INT_ENB, value);
 857
 858                 /* don't bother flushing the enables */
 859
 860                 spin_unlock_irqrestore
 861                         (&cn6xxx->lock_for_droq_int_enb_reg, flags);
 862         }
 863                 break;
 864         case OCTEON_CN23XX_PF_VID:
 865                 lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 866                 break;
 867
 868         case OCTEON_CN23XX_VF_VID:
 869                 lio_enable_irq(oct->droq[q_no], oct->instr_queue[q_no]);
 870                 break;
 871         default:
 872                 dev_err(&oct->pci_dev->dev, "%s Unknown Chip\n", __func__);
 873                 return 1;
 874         }
 875
 876         return 0;
 877 }
 878
 879 int octeon_register_droq_ops(struct octeon_device *oct, u32 q_no,
 880                              struct octeon_droq_ops *ops)
 881 {
 882         struct octeon_droq *droq;
 883         unsigned long flags;
 884         struct octeon_config *oct_cfg = NULL;
 885
 886         oct_cfg = octeon_get_conf(oct);
 887
 888         if (!oct_cfg)
 889                 return -EINVAL;
 890
 891         if (!(ops)) {
 892                 dev_err(&oct->pci_dev->dev, "%s: droq_ops pointer is NULL\n",
 893                         __func__);
 894                 return -EINVAL;
 895         }
 896
 897         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 898                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 899                         __func__, q_no, (oct->num_oqs - 1));
 900                 return -EINVAL;
 901         }
 902
 903         droq = oct->droq[q_no];
 904
 905         spin_lock_irqsave(&droq->lock, flags);
 906
 907         memcpy(&droq->ops, ops, sizeof(struct octeon_droq_ops));
 908
 909         spin_unlock_irqrestore(&droq->lock, flags);
 910
 911         return 0;
 912 }
 913
 914 int octeon_unregister_droq_ops(struct octeon_device *oct, u32 q_no)
 915 {
 916         unsigned long flags;
 917         struct octeon_droq *droq;
 918         struct octeon_config *oct_cfg = NULL;
 919
 920         oct_cfg = octeon_get_conf(oct);
 921
 922         if (!oct_cfg)
 923                 return -EINVAL;
 924
 925         if (q_no >= CFG_GET_OQ_MAX_Q(oct_cfg)) {
 926                 dev_err(&oct->pci_dev->dev, "%s: droq id (%d) exceeds MAX (%d)\n",
 927                         __func__, q_no, oct->num_oqs - 1);
 928                 return -EINVAL;
 929         }
 930
 931         droq = oct->droq[q_no];
 932
 933         if (!droq) {
 934                 dev_info(&oct->pci_dev->dev,
 935                          "Droq id (%d) not available.\n", q_no);
 936                 return 0;
 937         }
 938
 939         spin_lock_irqsave(&droq->lock, flags);
 940
 941         droq->ops.fptr = NULL;
 942         droq->ops.farg = NULL;
 943         droq->ops.drop_on_max = 0;
 944
 945         spin_unlock_irqrestore(&droq->lock, flags);
 946
 947         return 0;
 948 }
 949
 950 int octeon_create_droq(struct octeon_device *oct,
 951                        u32 q_no, u32 num_descs,
 952                        u32 desc_size, void *app_ctx)
 953 {
 954         struct octeon_droq *droq;
 955         int numa_node = dev_to_node(&oct->pci_dev->dev);
 956
 957         if (oct->droq[q_no]) {
 958                 dev_dbg(&oct->pci_dev->dev, "Droq already in use. Cannot create droq %d again\n",
 959                         q_no);
 960                 return 1;
 961         }
 962
 963         /* Allocate the DS for the new droq. */
 964         droq = vmalloc_node(sizeof(*droq), numa_node);
 965         if (!droq)
 966                 droq = vmalloc(sizeof(*droq));
 967         if (!droq)
 968                 return -1;
 969
 970         memset(droq, 0, sizeof(struct octeon_droq));
 971
 972         /*Disable the pkt o/p for this Q  */
 973         octeon_set_droq_pkt_op(oct, q_no, 0);
 974         oct->droq[q_no] = droq;
 975
 976         /* Initialize the Droq */
 977         if (octeon_init_droq(oct, q_no, num_descs, desc_size, app_ctx)) {
 978                 vfree(oct->droq[q_no]);
 979                 oct->droq[q_no] = NULL;
 980                 return -1;
 981         }
 982
 983         oct->num_oqs++;
 984
 985         dev_dbg(&oct->pci_dev->dev, "%s: Total number of OQ: %d\n", __func__,
 986                 oct->num_oqs);
 987
 988         /* Global Droq register settings */
 989
 990         /* As of now not required, as setting are done for all 32 Droqs at
 991          * the same time.
 992          */
 993         return 0;
 994 }