drivers/net/ethernet/qlogic/qed/qed_spq.c

   1 /* QLogic qed NIC Driver
   2  * Copyright (c) 2015 QLogic Corporation
   3  *
   4  * This software is available under the terms of the GNU General Public License
   5  * (GPL) Version 2, available from the file COPYING in the main directory of
   6  * this source tree.
   7  */
   8
   9 #include <linux/types.h>
  10 #include <asm/byteorder.h>
  11 #include <linux/io.h>
  12 #include <linux/delay.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/pci.h>
  18 #include <linux/slab.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/string.h>
  21 #include "qed.h"
  22 #include "qed_cxt.h"
  23 #include "qed_dev_api.h"
  24 #include "qed_hsi.h"
  25 #include "qed_hw.h"
  26 #include "qed_int.h"
  27 #include "qed_mcp.h"
  28 #include "qed_reg_addr.h"
  29 #include "qed_sp.h"
  30
  31 /***************************************************************************
  32 * Structures & Definitions
  33 ***************************************************************************/
  34
  35 #define SPQ_HIGH_PRI_RESERVE_DEFAULT    (1)
  36 #define SPQ_BLOCK_SLEEP_LENGTH          (1000)
  37
  38 /***************************************************************************
  39 * Blocking Imp. (BLOCK/EBLOCK mode)
  40 ***************************************************************************/
  41 static void qed_spq_blocking_cb(struct qed_hwfn *p_hwfn,
  42                                 void *cookie,
  43                                 union event_ring_data *data,
  44                                 u8 fw_return_code)
  45 {
  46         struct qed_spq_comp_done *comp_done;
  47
  48         comp_done = (struct qed_spq_comp_done *)cookie;
  49
  50         comp_done->done                 = 0x1;
  51         comp_done->fw_return_code       = fw_return_code;
  52
  53         /* make update visible to waiting thread */
  54         smp_wmb();
  55 }
  56
  57 static int qed_spq_block(struct qed_hwfn *p_hwfn,
  58                          struct qed_spq_entry *p_ent,
  59                          u8 *p_fw_ret)
  60 {
  61         int sleep_count = SPQ_BLOCK_SLEEP_LENGTH;
  62         struct qed_spq_comp_done *comp_done;
  63         int rc;
  64
  65         comp_done = (struct qed_spq_comp_done *)p_ent->comp_cb.cookie;
  66         while (sleep_count) {
  67                 /* validate we receive completion update */
  68                 smp_rmb();
  69                 if (comp_done->done == 1) {
  70                         if (p_fw_ret)
  71                                 *p_fw_ret = comp_done->fw_return_code;
  72                         return 0;
  73                 }
  74                 usleep_range(5000, 10000);
  75                 sleep_count--;
  76         }
  77
  78         DP_INFO(p_hwfn, "Ramrod is stuck, requesting MCP drain\n");
  79         rc = qed_mcp_drain(p_hwfn, p_hwfn->p_main_ptt);
  80         if (rc != 0)
  81                 DP_NOTICE(p_hwfn, "MCP drain failed\n");
  82
  83         /* Retry after drain */
  84         sleep_count = SPQ_BLOCK_SLEEP_LENGTH;
  85         while (sleep_count) {
  86                 /* validate we receive completion update */
  87                 smp_rmb();
  88                 if (comp_done->done == 1) {
  89                         if (p_fw_ret)
  90                                 *p_fw_ret = comp_done->fw_return_code;
  91                         return 0;
  92                 }
  93                 usleep_range(5000, 10000);
  94                 sleep_count--;
  95         }
  96
  97         if (comp_done->done == 1) {
  98                 if (p_fw_ret)
  99                         *p_fw_ret = comp_done->fw_return_code;
 100                 return 0;
 101         }
 102
 103         DP_NOTICE(p_hwfn, "Ramrod is stuck, MCP drain failed\n");
 104
 105         return -EBUSY;
 106 }
 107
 108 /***************************************************************************
 109 * SPQ entries inner API
 110 ***************************************************************************/
 111 static int
 112 qed_spq_fill_entry(struct qed_hwfn *p_hwfn,
 113                    struct qed_spq_entry *p_ent)
 114 {
 115         p_ent->flags = 0;
 116
 117         switch (p_ent->comp_mode) {
 118         case QED_SPQ_MODE_EBLOCK:
 119         case QED_SPQ_MODE_BLOCK:
 120                 p_ent->comp_cb.function = qed_spq_blocking_cb;
 121                 break;
 122         case QED_SPQ_MODE_CB:
 123                 break;
 124         default:
 125                 DP_NOTICE(p_hwfn, "Unknown SPQE completion mode %d\n",
 126                           p_ent->comp_mode);
 127                 return -EINVAL;
 128         }
 129
 130         DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
 131                    "Ramrod header: [CID 0x%08x CMD 0x%02x protocol 0x%02x] Data pointer: [%08x:%08x] Completion Mode: %s\n",
 132                    p_ent->elem.hdr.cid,
 133                    p_ent->elem.hdr.cmd_id,
 134                    p_ent->elem.hdr.protocol_id,
 135                    p_ent->elem.data_ptr.hi,
 136                    p_ent->elem.data_ptr.lo,
 137                    D_TRINE(p_ent->comp_mode, QED_SPQ_MODE_EBLOCK,
 138                            QED_SPQ_MODE_BLOCK, "MODE_EBLOCK", "MODE_BLOCK",
 139                            "MODE_CB"));
 140
 141         return 0;
 142 }
 143
 144 /***************************************************************************
 145 * HSI access
 146 ***************************************************************************/
 147 static void qed_spq_hw_initialize(struct qed_hwfn *p_hwfn,
 148                                   struct qed_spq *p_spq)
 149 {
 150         u16                             pq;
 151         struct qed_cxt_info             cxt_info;
 152         struct core_conn_context        *p_cxt;
 153         union qed_qm_pq_params          pq_params;
 154         int                             rc;
 155
 156         cxt_info.iid = p_spq->cid;
 157
 158         rc = qed_cxt_get_cid_info(p_hwfn, &cxt_info);
 159
 160         if (rc < 0) {
 161                 DP_NOTICE(p_hwfn, "Cannot find context info for cid=%d\n",
 162                           p_spq->cid);
 163                 return;
 164         }
 165
 166         p_cxt = cxt_info.p_cxt;
 167
 168         SET_FIELD(p_cxt->xstorm_ag_context.flags10,
 169                   XSTORM_CORE_CONN_AG_CTX_DQ_CF_EN, 1);
 170         SET_FIELD(p_cxt->xstorm_ag_context.flags1,
 171                   XSTORM_CORE_CONN_AG_CTX_DQ_CF_ACTIVE, 1);
 172         SET_FIELD(p_cxt->xstorm_ag_context.flags9,
 173                   XSTORM_CORE_CONN_AG_CTX_CONSOLID_PROD_CF_EN, 1);
 174
 175         /* QM physical queue */
 176         memset(&pq_params, 0, sizeof(pq_params));
 177         pq_params.core.tc = LB_TC;
 178         pq = qed_get_qm_pq(p_hwfn, PROTOCOLID_CORE, &pq_params);
 179         p_cxt->xstorm_ag_context.physical_q0 = cpu_to_le16(pq);
 180
 181         p_cxt->xstorm_st_context.spq_base_lo =
 182                 DMA_LO_LE(p_spq->chain.p_phys_addr);
 183         p_cxt->xstorm_st_context.spq_base_hi =
 184                 DMA_HI_LE(p_spq->chain.p_phys_addr);
 185
 186         DMA_REGPAIR_LE(p_cxt->xstorm_st_context.consolid_base_addr,
 187                        p_hwfn->p_consq->chain.p_phys_addr);
 188 }
 189
 190 static int qed_spq_hw_post(struct qed_hwfn *p_hwfn,
 191                            struct qed_spq *p_spq,
 192                            struct qed_spq_entry *p_ent)
 193 {
 194         struct qed_chain *p_chain = &p_hwfn->p_spq->chain;
 195         u16 echo = qed_chain_get_prod_idx(p_chain);
 196         struct slow_path_element        *elem;
 197         struct core_db_data             db;
 198
 199         p_ent->elem.hdr.echo    = cpu_to_le16(echo);
 200         elem = qed_chain_produce(p_chain);
 201         if (!elem) {
 202                 DP_NOTICE(p_hwfn, "Failed to produce from SPQ chain\n");
 203                 return -EINVAL;
 204         }
 205
 206         *elem = p_ent->elem; /* struct assignment */
 207
 208         /* send a doorbell on the slow hwfn session */
 209         memset(&db, 0, sizeof(db));
 210         SET_FIELD(db.params, CORE_DB_DATA_DEST, DB_DEST_XCM);
 211         SET_FIELD(db.params, CORE_DB_DATA_AGG_CMD, DB_AGG_CMD_SET);
 212         SET_FIELD(db.params, CORE_DB_DATA_AGG_VAL_SEL,
 213                   DQ_XCM_CORE_SPQ_PROD_CMD);
 214         db.agg_flags = DQ_XCM_CORE_DQ_CF_CMD;
 215
 216         /* validate producer is up to-date */
 217         rmb();
 218
 219         db.spq_prod = cpu_to_le16(qed_chain_get_prod_idx(p_chain));
 220
 221         /* do not reorder */
 222         barrier();
 223
 224         DOORBELL(p_hwfn, qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY), *(u32 *)&db);
 225
 226         /* make sure doorbell is rang */
 227         mmiowb();
 228
 229         DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
 230                    "Doorbelled [0x%08x, CID 0x%08x] with Flags: %02x agg_params: %02x, prod: %04x\n",
 231                    qed_db_addr(p_spq->cid, DQ_DEMS_LEGACY),
 232                    p_spq->cid, db.params, db.agg_flags,
 233                    qed_chain_get_prod_idx(p_chain));
 234
 235         return 0;
 236 }
 237
 238 /***************************************************************************
 239 * Asynchronous events
 240 ***************************************************************************/
 241 static int
 242 qed_async_event_completion(struct qed_hwfn *p_hwfn,
 243                            struct event_ring_entry *p_eqe)
 244 {
 245         DP_NOTICE(p_hwfn,
 246                   "Unknown Async completion for protocol: %d\n",
 247                    p_eqe->protocol_id);
 248         return -EINVAL;
 249 }
 250
 251 /***************************************************************************
 252 * EQ API
 253 ***************************************************************************/
 254 void qed_eq_prod_update(struct qed_hwfn *p_hwfn,
 255                         u16 prod)
 256 {
 257         u32 addr = GTT_BAR0_MAP_REG_USDM_RAM +
 258                    USTORM_EQE_CONS_OFFSET(p_hwfn->rel_pf_id);
 259
 260         REG_WR16(p_hwfn, addr, prod);
 261
 262         /* keep prod updates ordered */
 263         mmiowb();
 264 }
 265
 266 int qed_eq_completion(struct qed_hwfn *p_hwfn,
 267                       void *cookie)
 268
 269 {
 270         struct qed_eq *p_eq = cookie;
 271         struct qed_chain *p_chain = &p_eq->chain;
 272         int rc = 0;
 273
 274         /* take a snapshot of the FW consumer */
 275         u16 fw_cons_idx = le16_to_cpu(*p_eq->p_fw_cons);
 276
 277         DP_VERBOSE(p_hwfn, QED_MSG_SPQ, "fw_cons_idx %x\n", fw_cons_idx);
 278
 279         /* Need to guarantee the fw_cons index we use points to a usuable
 280          * element (to comply with our chain), so our macros would comply
 281          */
 282         if ((fw_cons_idx & qed_chain_get_usable_per_page(p_chain)) ==
 283             qed_chain_get_usable_per_page(p_chain))
 284                 fw_cons_idx += qed_chain_get_unusable_per_page(p_chain);
 285
 286         /* Complete current segment of eq entries */
 287         while (fw_cons_idx != qed_chain_get_cons_idx(p_chain)) {
 288                 struct event_ring_entry *p_eqe = qed_chain_consume(p_chain);
 289
 290                 if (!p_eqe) {
 291                         rc = -EINVAL;
 292                         break;
 293                 }
 294
 295                 DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
 296                            "op %x prot %x res0 %x echo %x fwret %x flags %x\n",
 297                            p_eqe->opcode,
 298                            p_eqe->protocol_id,
 299                            p_eqe->reserved0,
 300                            le16_to_cpu(p_eqe->echo),
 301                            p_eqe->fw_return_code,
 302                            p_eqe->flags);
 303
 304                 if (GET_FIELD(p_eqe->flags, EVENT_RING_ENTRY_ASYNC)) {
 305                         if (qed_async_event_completion(p_hwfn, p_eqe))
 306                                 rc = -EINVAL;
 307                 } else if (qed_spq_completion(p_hwfn,
 308                                               p_eqe->echo,
 309                                               p_eqe->fw_return_code,
 310                                               &p_eqe->data)) {
 311                         rc = -EINVAL;
 312                 }
 313
 314                 qed_chain_recycle_consumed(p_chain);
 315         }
 316
 317         qed_eq_prod_update(p_hwfn, qed_chain_get_prod_idx(p_chain));
 318
 319         return rc;
 320 }
 321
 322 struct qed_eq *qed_eq_alloc(struct qed_hwfn *p_hwfn,
 323                             u16 num_elem)
 324 {
 325         struct qed_eq *p_eq;
 326
 327         /* Allocate EQ struct */
 328         p_eq = kzalloc(sizeof(*p_eq), GFP_KERNEL);
 329         if (!p_eq) {
 330                 DP_NOTICE(p_hwfn, "Failed to allocate `struct qed_eq'\n");
 331                 return NULL;
 332         }
 333
 334         /* Allocate and initialize EQ chain*/
 335         if (qed_chain_alloc(p_hwfn->cdev,
 336                             QED_CHAIN_USE_TO_PRODUCE,
 337                             QED_CHAIN_MODE_PBL,
 338                             num_elem,
 339                             sizeof(union event_ring_element),
 340                             &p_eq->chain)) {
 341                 DP_NOTICE(p_hwfn, "Failed to allocate eq chain\n");
 342                 goto eq_allocate_fail;
 343         }
 344
 345         /* register EQ completion on the SP SB */
 346         qed_int_register_cb(p_hwfn,
 347                             qed_eq_completion,
 348                             p_eq,
 349                             &p_eq->eq_sb_index,
 350                             &p_eq->p_fw_cons);
 351
 352         return p_eq;
 353
 354 eq_allocate_fail:
 355         qed_eq_free(p_hwfn, p_eq);
 356         return NULL;
 357 }
 358
 359 void qed_eq_setup(struct qed_hwfn *p_hwfn,
 360                   struct qed_eq *p_eq)
 361 {
 362         qed_chain_reset(&p_eq->chain);
 363 }
 364
 365 void qed_eq_free(struct qed_hwfn *p_hwfn,
 366                  struct qed_eq *p_eq)
 367 {
 368         if (!p_eq)
 369                 return;
 370         qed_chain_free(p_hwfn->cdev, &p_eq->chain);
 371         kfree(p_eq);
 372 }
 373
 374 /***************************************************************************
 375 * CQE API - manipulate EQ functionality
 376 ***************************************************************************/
 377 static int qed_cqe_completion(
 378         struct qed_hwfn *p_hwfn,
 379         struct eth_slow_path_rx_cqe *cqe,
 380         enum protocol_type protocol)
 381 {
 382         /* @@@tmp - it's possible we'll eventually want to handle some
 383          * actual commands that can arrive here, but for now this is only
 384          * used to complete the ramrod using the echo value on the cqe
 385          */
 386         return qed_spq_completion(p_hwfn, cqe->echo, 0, NULL);
 387 }
 388
 389 int qed_eth_cqe_completion(struct qed_hwfn *p_hwfn,
 390                            struct eth_slow_path_rx_cqe *cqe)
 391 {
 392         int rc;
 393
 394         rc = qed_cqe_completion(p_hwfn, cqe, PROTOCOLID_ETH);
 395         if (rc)
 396                 DP_NOTICE(p_hwfn,
 397                           "Failed to handle RXQ CQE [cmd 0x%02x]\n",
 398                           cqe->ramrod_cmd_id);
 399
 400         return rc;
 401 }
 402
 403 /***************************************************************************
 404 * Slow hwfn Queue (spq)
 405 ***************************************************************************/
 406 void qed_spq_setup(struct qed_hwfn *p_hwfn)
 407 {
 408         struct qed_spq          *p_spq  = p_hwfn->p_spq;
 409         struct qed_spq_entry    *p_virt = NULL;
 410         dma_addr_t              p_phys  = 0;
 411         unsigned int            i       = 0;
 412
 413         INIT_LIST_HEAD(&p_spq->pending);
 414         INIT_LIST_HEAD(&p_spq->completion_pending);
 415         INIT_LIST_HEAD(&p_spq->free_pool);
 416         INIT_LIST_HEAD(&p_spq->unlimited_pending);
 417         spin_lock_init(&p_spq->lock);
 418
 419         /* SPQ empty pool */
 420         p_phys  = p_spq->p_phys + offsetof(struct qed_spq_entry, ramrod);
 421         p_virt  = p_spq->p_virt;
 422
 423         for (i = 0; i < p_spq->chain.capacity; i++) {
 424                 DMA_REGPAIR_LE(p_virt->elem.data_ptr, p_phys);
 425
 426                 list_add_tail(&p_virt->list, &p_spq->free_pool);
 427
 428                 p_virt++;
 429                 p_phys += sizeof(struct qed_spq_entry);
 430         }
 431
 432         /* Statistics */
 433         p_spq->normal_count             = 0;
 434         p_spq->comp_count               = 0;
 435         p_spq->comp_sent_count          = 0;
 436         p_spq->unlimited_pending_count  = 0;
 437
 438         bitmap_zero(p_spq->p_comp_bitmap, SPQ_RING_SIZE);
 439         p_spq->comp_bitmap_idx = 0;
 440
 441         /* SPQ cid, cannot fail */
 442         qed_cxt_acquire_cid(p_hwfn, PROTOCOLID_CORE, &p_spq->cid);
 443         qed_spq_hw_initialize(p_hwfn, p_spq);
 444
 445         /* reset the chain itself */
 446         qed_chain_reset(&p_spq->chain);
 447 }
 448
 449 int qed_spq_alloc(struct qed_hwfn *p_hwfn)
 450 {
 451         struct qed_spq          *p_spq  = NULL;
 452         dma_addr_t              p_phys  = 0;
 453         struct qed_spq_entry    *p_virt = NULL;
 454
 455         /* SPQ struct */
 456         p_spq =
 457                 kzalloc(sizeof(struct qed_spq), GFP_KERNEL);
 458         if (!p_spq) {
 459                 DP_NOTICE(p_hwfn, "Failed to allocate `struct qed_spq'\n");
 460                 return -ENOMEM;
 461         }
 462
 463         /* SPQ ring  */
 464         if (qed_chain_alloc(p_hwfn->cdev,
 465                             QED_CHAIN_USE_TO_PRODUCE,
 466                             QED_CHAIN_MODE_SINGLE,
 467                             0,   /* N/A when the mode is SINGLE */
 468                             sizeof(struct slow_path_element),
 469                             &p_spq->chain)) {
 470                 DP_NOTICE(p_hwfn, "Failed to allocate spq chain\n");
 471                 goto spq_allocate_fail;
 472         }
 473
 474         /* allocate and fill the SPQ elements (incl. ramrod data list) */
 475         p_virt = dma_alloc_coherent(&p_hwfn->cdev->pdev->dev,
 476                                     p_spq->chain.capacity *
 477                                     sizeof(struct qed_spq_entry),
 478                                     &p_phys,
 479                                     GFP_KERNEL);
 480
 481         if (!p_virt)
 482                 goto spq_allocate_fail;
 483
 484         p_spq->p_virt = p_virt;
 485         p_spq->p_phys = p_phys;
 486         p_hwfn->p_spq = p_spq;
 487
 488         return 0;
 489
 490 spq_allocate_fail:
 491         qed_chain_free(p_hwfn->cdev, &p_spq->chain);
 492         kfree(p_spq);
 493         return -ENOMEM;
 494 }
 495
 496 void qed_spq_free(struct qed_hwfn *p_hwfn)
 497 {
 498         struct qed_spq *p_spq = p_hwfn->p_spq;
 499
 500         if (!p_spq)
 501                 return;
 502
 503         if (p_spq->p_virt)
 504                 dma_free_coherent(&p_hwfn->cdev->pdev->dev,
 505                                   p_spq->chain.capacity *
 506                                   sizeof(struct qed_spq_entry),
 507                                   p_spq->p_virt,
 508                                   p_spq->p_phys);
 509
 510         qed_chain_free(p_hwfn->cdev, &p_spq->chain);
 511         ;
 512         kfree(p_spq);
 513 }
 514
 515 int
 516 qed_spq_get_entry(struct qed_hwfn *p_hwfn,
 517                   struct qed_spq_entry **pp_ent)
 518 {
 519         struct qed_spq *p_spq = p_hwfn->p_spq;
 520         struct qed_spq_entry *p_ent = NULL;
 521         int rc = 0;
 522
 523         spin_lock_bh(&p_spq->lock);
 524
 525         if (list_empty(&p_spq->free_pool)) {
 526                 p_ent = kzalloc(sizeof(*p_ent), GFP_ATOMIC);
 527                 if (!p_ent) {
 528                         rc = -ENOMEM;
 529                         goto out_unlock;
 530                 }
 531                 p_ent->queue = &p_spq->unlimited_pending;
 532         } else {
 533                 p_ent = list_first_entry(&p_spq->free_pool,
 534                                          struct qed_spq_entry,
 535                                          list);
 536                 list_del(&p_ent->list);
 537                 p_ent->queue = &p_spq->pending;
 538         }
 539
 540         *pp_ent = p_ent;
 541
 542 out_unlock:
 543         spin_unlock_bh(&p_spq->lock);
 544         return rc;
 545 }
 546
 547 /* Locked variant; Should be called while the SPQ lock is taken */
 548 static void __qed_spq_return_entry(struct qed_hwfn *p_hwfn,
 549                                    struct qed_spq_entry *p_ent)
 550 {
 551         list_add_tail(&p_ent->list, &p_hwfn->p_spq->free_pool);
 552 }
 553
 554 void qed_spq_return_entry(struct qed_hwfn *p_hwfn,
 555                           struct qed_spq_entry *p_ent)
 556 {
 557         spin_lock_bh(&p_hwfn->p_spq->lock);
 558         __qed_spq_return_entry(p_hwfn, p_ent);
 559         spin_unlock_bh(&p_hwfn->p_spq->lock);
 560 }
 561
 562 /**
 563  * @brief qed_spq_add_entry - adds a new entry to the pending
 564  *        list. Should be used while lock is being held.
 565  *
 566  * Addes an entry to the pending list is there is room (en empty
 567  * element is available in the free_pool), or else places the
 568  * entry in the unlimited_pending pool.
 569  *
 570  * @param p_hwfn
 571  * @param p_ent
 572  * @param priority
 573  *
 574  * @return int
 575  */
 576 static int
 577 qed_spq_add_entry(struct qed_hwfn *p_hwfn,
 578                   struct qed_spq_entry *p_ent,
 579                   enum spq_priority priority)
 580 {
 581         struct qed_spq *p_spq = p_hwfn->p_spq;
 582
 583         if (p_ent->queue == &p_spq->unlimited_pending) {
 584
 585                 if (list_empty(&p_spq->free_pool)) {
 586                         list_add_tail(&p_ent->list, &p_spq->unlimited_pending);
 587                         p_spq->unlimited_pending_count++;
 588
 589                         return 0;
 590                 } else {
 591                         struct qed_spq_entry *p_en2;
 592
 593                         p_en2 = list_first_entry(&p_spq->free_pool,
 594                                                  struct qed_spq_entry,
 595                                                  list);
 596                         list_del(&p_en2->list);
 597
 598                         /* Copy the ring element physical pointer to the new
 599                          * entry, since we are about to override the entire ring
 600                          * entry and don't want to lose the pointer.
 601                          */
 602                         p_ent->elem.data_ptr = p_en2->elem.data_ptr;
 603
 604                         *p_en2 = *p_ent;
 605
 606                         kfree(p_ent);
 607
 608                         p_ent = p_en2;
 609                 }
 610         }
 611
 612         /* entry is to be placed in 'pending' queue */
 613         switch (priority) {
 614         case QED_SPQ_PRIORITY_NORMAL:
 615                 list_add_tail(&p_ent->list, &p_spq->pending);
 616                 p_spq->normal_count++;
 617                 break;
 618         case QED_SPQ_PRIORITY_HIGH:
 619                 list_add(&p_ent->list, &p_spq->pending);
 620                 p_spq->high_count++;
 621                 break;
 622         default:
 623                 return -EINVAL;
 624         }
 625
 626         return 0;
 627 }
 628
 629 /***************************************************************************
 630 * Accessor
 631 ***************************************************************************/
 632 u32 qed_spq_get_cid(struct qed_hwfn *p_hwfn)
 633 {
 634         if (!p_hwfn->p_spq)
 635                 return 0xffffffff;      /* illegal */
 636         return p_hwfn->p_spq->cid;
 637 }
 638
 639 /***************************************************************************
 640 * Posting new Ramrods
 641 ***************************************************************************/
 642 static int qed_spq_post_list(struct qed_hwfn *p_hwfn,
 643                              struct list_head *head,
 644                              u32 keep_reserve)
 645 {
 646         struct qed_spq *p_spq = p_hwfn->p_spq;
 647         int rc;
 648
 649         while (qed_chain_get_elem_left(&p_spq->chain) > keep_reserve &&
 650                !list_empty(head)) {
 651                 struct qed_spq_entry *p_ent =
 652                         list_first_entry(head, struct qed_spq_entry, list);
 653                 list_del(&p_ent->list);
 654                 list_add_tail(&p_ent->list, &p_spq->completion_pending);
 655                 p_spq->comp_sent_count++;
 656
 657                 rc = qed_spq_hw_post(p_hwfn, p_spq, p_ent);
 658                 if (rc) {
 659                         list_del(&p_ent->list);
 660                         __qed_spq_return_entry(p_hwfn, p_ent);
 661                         return rc;
 662                 }
 663         }
 664
 665         return 0;
 666 }
 667
 668 static int qed_spq_pend_post(struct qed_hwfn *p_hwfn)
 669 {
 670         struct qed_spq *p_spq = p_hwfn->p_spq;
 671         struct qed_spq_entry *p_ent = NULL;
 672
 673         while (!list_empty(&p_spq->free_pool)) {
 674                 if (list_empty(&p_spq->unlimited_pending))
 675                         break;
 676
 677                 p_ent = list_first_entry(&p_spq->unlimited_pending,
 678                                          struct qed_spq_entry,
 679                                          list);
 680                 if (!p_ent)
 681                         return -EINVAL;
 682
 683                 list_del(&p_ent->list);
 684
 685                 qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
 686         }
 687
 688         return qed_spq_post_list(p_hwfn, &p_spq->pending,
 689                                  SPQ_HIGH_PRI_RESERVE_DEFAULT);
 690 }
 691
 692 int qed_spq_post(struct qed_hwfn *p_hwfn,
 693                  struct qed_spq_entry *p_ent,
 694                  u8 *fw_return_code)
 695 {
 696         int rc = 0;
 697         struct qed_spq *p_spq = p_hwfn ? p_hwfn->p_spq : NULL;
 698         bool b_ret_ent = true;
 699
 700         if (!p_hwfn)
 701                 return -EINVAL;
 702
 703         if (!p_ent) {
 704                 DP_NOTICE(p_hwfn, "Got a NULL pointer\n");
 705                 return -EINVAL;
 706         }
 707
 708         /* Complete the entry */
 709         rc = qed_spq_fill_entry(p_hwfn, p_ent);
 710
 711         spin_lock_bh(&p_spq->lock);
 712
 713         /* Check return value after LOCK is taken for cleaner error flow */
 714         if (rc)
 715                 goto spq_post_fail;
 716
 717         /* Add the request to the pending queue */
 718         rc = qed_spq_add_entry(p_hwfn, p_ent, p_ent->priority);
 719         if (rc)
 720                 goto spq_post_fail;
 721
 722         rc = qed_spq_pend_post(p_hwfn);
 723         if (rc) {
 724                 /* Since it's possible that pending failed for a different
 725                  * entry [although unlikely], the failed entry was already
 726                  * dealt with; No need to return it here.
 727                  */
 728                 b_ret_ent = false;
 729                 goto spq_post_fail;
 730         }
 731
 732         spin_unlock_bh(&p_spq->lock);
 733
 734         if (p_ent->comp_mode == QED_SPQ_MODE_EBLOCK) {
 735                 /* For entries in QED BLOCK mode, the completion code cannot
 736                  * perform the necessary cleanup - if it did, we couldn't
 737                  * access p_ent here to see whether it's successful or not.
 738                  * Thus, after gaining the answer perform the cleanup here.
 739                  */
 740                 rc = qed_spq_block(p_hwfn, p_ent, fw_return_code);
 741                 if (rc)
 742                         goto spq_post_fail2;
 743
 744                 /* return to pool */
 745                 qed_spq_return_entry(p_hwfn, p_ent);
 746         }
 747         return rc;
 748
 749 spq_post_fail2:
 750         spin_lock_bh(&p_spq->lock);
 751         list_del(&p_ent->list);
 752         qed_chain_return_produced(&p_spq->chain);
 753
 754 spq_post_fail:
 755         /* return to the free pool */
 756         if (b_ret_ent)
 757                 __qed_spq_return_entry(p_hwfn, p_ent);
 758         spin_unlock_bh(&p_spq->lock);
 759
 760         return rc;
 761 }
 762
 763 int qed_spq_completion(struct qed_hwfn *p_hwfn,
 764                        __le16 echo,
 765                        u8 fw_return_code,
 766                        union event_ring_data *p_data)
 767 {
 768         struct qed_spq          *p_spq;
 769         struct qed_spq_entry    *p_ent = NULL;
 770         struct qed_spq_entry    *tmp;
 771         struct qed_spq_entry    *found = NULL;
 772         int                     rc;
 773
 774         if (!p_hwfn)
 775                 return -EINVAL;
 776
 777         p_spq = p_hwfn->p_spq;
 778         if (!p_spq)
 779                 return -EINVAL;
 780
 781         spin_lock_bh(&p_spq->lock);
 782         list_for_each_entry_safe(p_ent, tmp, &p_spq->completion_pending,
 783                                  list) {
 784                 if (p_ent->elem.hdr.echo == echo) {
 785                         u16 pos = le16_to_cpu(echo) % SPQ_RING_SIZE;
 786
 787                         list_del(&p_ent->list);
 788
 789                         /* Avoid overriding of SPQ entries when getting
 790                          * out-of-order completions, by marking the completions
 791                          * in a bitmap and increasing the chain consumer only
 792                          * for the first successive completed entries.
 793                          */
 794                         bitmap_set(p_spq->p_comp_bitmap, pos, SPQ_RING_SIZE);
 795
 796                         while (test_bit(p_spq->comp_bitmap_idx,
 797                                         p_spq->p_comp_bitmap)) {
 798                                 bitmap_clear(p_spq->p_comp_bitmap,
 799                                              p_spq->comp_bitmap_idx,
 800                                              SPQ_RING_SIZE);
 801                                 p_spq->comp_bitmap_idx++;
 802                                 qed_chain_return_produced(&p_spq->chain);
 803                         }
 804
 805                         p_spq->comp_count++;
 806                         found = p_ent;
 807                         break;
 808                 }
 809
 810                 /* This is relatively uncommon - depends on scenarios
 811                  * which have mutliple per-PF sent ramrods.
 812                  */
 813                 DP_VERBOSE(p_hwfn, QED_MSG_SPQ,
 814                            "Got completion for echo %04x - doesn't match echo %04x in completion pending list\n",
 815                            le16_to_cpu(echo),
 816                            le16_to_cpu(p_ent->elem.hdr.echo));
 817         }
 818
 819         /* Release lock before callback, as callback may post
 820          * an additional ramrod.
 821          */
 822         spin_unlock_bh(&p_spq->lock);
 823
 824         if (!found) {
 825                 DP_NOTICE(p_hwfn,
 826                           "Failed to find an entry this EQE completes\n");
 827                 return -EEXIST;
 828         }
 829
 830         DP_VERBOSE(p_hwfn, QED_MSG_SPQ, "Complete: func %p cookie %p)\n",
 831                    p_ent->comp_cb.function, p_ent->comp_cb.cookie);
 832         if (found->comp_cb.function)
 833                 found->comp_cb.function(p_hwfn, found->comp_cb.cookie, p_data,
 834                                         fw_return_code);
 835
 836         if (found->comp_mode != QED_SPQ_MODE_EBLOCK)
 837                 /* EBLOCK is responsible for freeing its own entry */
 838                 qed_spq_return_entry(p_hwfn, found);
 839
 840         /* Attempt to post pending requests */
 841         spin_lock_bh(&p_spq->lock);
 842         rc = qed_spq_pend_post(p_hwfn);
 843         spin_unlock_bh(&p_spq->lock);
 844
 845         return rc;
 846 }
 847
 848 struct qed_consq *qed_consq_alloc(struct qed_hwfn *p_hwfn)
 849 {
 850         struct qed_consq *p_consq;
 851
 852         /* Allocate ConsQ struct */
 853         p_consq = kzalloc(sizeof(*p_consq), GFP_KERNEL);
 854         if (!p_consq) {
 855                 DP_NOTICE(p_hwfn, "Failed to allocate `struct qed_consq'\n");
 856                 return NULL;
 857         }
 858
 859         /* Allocate and initialize EQ chain*/
 860         if (qed_chain_alloc(p_hwfn->cdev,
 861                             QED_CHAIN_USE_TO_PRODUCE,
 862                             QED_CHAIN_MODE_PBL,
 863                             QED_CHAIN_PAGE_SIZE / 0x80,
 864                             0x80,
 865                             &p_consq->chain)) {
 866                 DP_NOTICE(p_hwfn, "Failed to allocate consq chain");
 867                 goto consq_allocate_fail;
 868         }
 869
 870         return p_consq;
 871
 872 consq_allocate_fail:
 873         qed_consq_free(p_hwfn, p_consq);
 874         return NULL;
 875 }
 876
 877 void qed_consq_setup(struct qed_hwfn *p_hwfn,
 878                      struct qed_consq *p_consq)
 879 {
 880         qed_chain_reset(&p_consq->chain);
 881 }
 882
 883 void qed_consq_free(struct qed_hwfn *p_hwfn,
 884                     struct qed_consq *p_consq)
 885 {
 886         if (!p_consq)
 887                 return;
 888         qed_chain_free(p_hwfn->cdev, &p_consq->chain);
 889         kfree(p_consq);
 890 }