drivers/scsi/qedf/qedf_io.c

   1 /*
   2  *  QLogic FCoE Offload Driver
   3  *  Copyright (c) 2016 Cavium Inc.
   4  *
   5  *  This software is available under the terms of the GNU General Public License
   6  *  (GPL) Version 2, available from the file COPYING in the main directory of
   7  *  this source tree.
   8  */
   9 #include <linux/spinlock.h>
  10 #include <linux/vmalloc.h>
  11 #include "qedf.h"
  12 #include <scsi/scsi_tcq.h>
  13
  14 void qedf_cmd_timer_set(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
  15         unsigned int timer_msec)
  16 {
  17         queue_delayed_work(qedf->timer_work_queue, &io_req->timeout_work,
  18             msecs_to_jiffies(timer_msec));
  19 }
  20
  21 static void qedf_cmd_timeout(struct work_struct *work)
  22 {
  23
  24         struct qedf_ioreq *io_req =
  25             container_of(work, struct qedf_ioreq, timeout_work.work);
  26         struct qedf_ctx *qedf = io_req->fcport->qedf;
  27         struct qedf_rport *fcport = io_req->fcport;
  28         u8 op = 0;
  29
  30         switch (io_req->cmd_type) {
  31         case QEDF_ABTS:
  32                 QEDF_ERR((&qedf->dbg_ctx), "ABTS timeout, xid=0x%x.\n",
  33                     io_req->xid);
  34                 /* Cleanup timed out ABTS */
  35                 qedf_initiate_cleanup(io_req, true);
  36                 complete(&io_req->abts_done);
  37
  38                 /*
  39                  * Need to call kref_put for reference taken when initiate_abts
  40                  * was called since abts_compl won't be called now that we've
  41                  * cleaned up the task.
  42                  */
  43                 kref_put(&io_req->refcount, qedf_release_cmd);
  44
  45                 /*
  46                  * Now that the original I/O and the ABTS are complete see
  47                  * if we need to reconnect to the target.
  48                  */
  49                 qedf_restart_rport(fcport);
  50                 break;
  51         case QEDF_ELS:
  52                 kref_get(&io_req->refcount);
  53                 /*
  54                  * Don't attempt to clean an ELS timeout as any subseqeunt
  55                  * ABTS or cleanup requests just hang.  For now just free
  56                  * the resources of the original I/O and the RRQ
  57                  */
  58                 QEDF_ERR(&(qedf->dbg_ctx), "ELS timeout, xid=0x%x.\n",
  59                           io_req->xid);
  60                 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
  61                 /* Call callback function to complete command */
  62                 if (io_req->cb_func && io_req->cb_arg) {
  63                         op = io_req->cb_arg->op;
  64                         io_req->cb_func(io_req->cb_arg);
  65                         io_req->cb_arg = NULL;
  66                 }
  67                 qedf_initiate_cleanup(io_req, true);
  68                 kref_put(&io_req->refcount, qedf_release_cmd);
  69                 break;
  70         case QEDF_SEQ_CLEANUP:
  71                 QEDF_ERR(&(qedf->dbg_ctx), "Sequence cleanup timeout, "
  72                     "xid=0x%x.\n", io_req->xid);
  73                 qedf_initiate_cleanup(io_req, true);
  74                 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
  75                 qedf_process_seq_cleanup_compl(qedf, NULL, io_req);
  76                 break;
  77         default:
  78                 break;
  79         }
  80 }
  81
  82 void qedf_cmd_mgr_free(struct qedf_cmd_mgr *cmgr)
  83 {
  84         struct io_bdt *bdt_info;
  85         struct qedf_ctx *qedf = cmgr->qedf;
  86         size_t bd_tbl_sz;
  87         u16 min_xid = QEDF_MIN_XID;
  88         u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
  89         int num_ios;
  90         int i;
  91         struct qedf_ioreq *io_req;
  92
  93         num_ios = max_xid - min_xid + 1;
  94
  95         /* Free fcoe_bdt_ctx structures */
  96         if (!cmgr->io_bdt_pool)
  97                 goto free_cmd_pool;
  98
  99         bd_tbl_sz = QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge);
 100         for (i = 0; i < num_ios; i++) {
 101                 bdt_info = cmgr->io_bdt_pool[i];
 102                 if (bdt_info->bd_tbl) {
 103                         dma_free_coherent(&qedf->pdev->dev, bd_tbl_sz,
 104                             bdt_info->bd_tbl, bdt_info->bd_tbl_dma);
 105                         bdt_info->bd_tbl = NULL;
 106                 }
 107         }
 108
 109         /* Destroy io_bdt pool */
 110         for (i = 0; i < num_ios; i++) {
 111                 kfree(cmgr->io_bdt_pool[i]);
 112                 cmgr->io_bdt_pool[i] = NULL;
 113         }
 114
 115         kfree(cmgr->io_bdt_pool);
 116         cmgr->io_bdt_pool = NULL;
 117
 118 free_cmd_pool:
 119
 120         for (i = 0; i < num_ios; i++) {
 121                 io_req = &cmgr->cmds[i];
 122                 kfree(io_req->sgl_task_params);
 123                 kfree(io_req->task_params);
 124                 /* Make sure we free per command sense buffer */
 125                 if (io_req->sense_buffer)
 126                         dma_free_coherent(&qedf->pdev->dev,
 127                             QEDF_SCSI_SENSE_BUFFERSIZE, io_req->sense_buffer,
 128                             io_req->sense_buffer_dma);
 129                 cancel_delayed_work_sync(&io_req->rrq_work);
 130         }
 131
 132         /* Free command manager itself */
 133         vfree(cmgr);
 134 }
 135
 136 static void qedf_handle_rrq(struct work_struct *work)
 137 {
 138         struct qedf_ioreq *io_req =
 139             container_of(work, struct qedf_ioreq, rrq_work.work);
 140
 141         qedf_send_rrq(io_req);
 142
 143 }
 144
 145 struct qedf_cmd_mgr *qedf_cmd_mgr_alloc(struct qedf_ctx *qedf)
 146 {
 147         struct qedf_cmd_mgr *cmgr;
 148         struct io_bdt *bdt_info;
 149         struct qedf_ioreq *io_req;
 150         u16 xid;
 151         int i;
 152         int num_ios;
 153         u16 min_xid = QEDF_MIN_XID;
 154         u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
 155
 156         /* Make sure num_queues is already set before calling this function */
 157         if (!qedf->num_queues) {
 158                 QEDF_ERR(&(qedf->dbg_ctx), "num_queues is not set.\n");
 159                 return NULL;
 160         }
 161
 162         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 163                 QEDF_WARN(&(qedf->dbg_ctx), "Invalid min_xid 0x%x and "
 164                            "max_xid 0x%x.\n", min_xid, max_xid);
 165                 return NULL;
 166         }
 167
 168         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "min xid 0x%x, max xid "
 169                    "0x%x.\n", min_xid, max_xid);
 170
 171         num_ios = max_xid - min_xid + 1;
 172
 173         cmgr = vzalloc(sizeof(struct qedf_cmd_mgr));
 174         if (!cmgr) {
 175                 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc cmd mgr.\n");
 176                 return NULL;
 177         }
 178
 179         cmgr->qedf = qedf;
 180         spin_lock_init(&cmgr->lock);
 181
 182         /*
 183          * Initialize I/O request fields.
 184          */
 185         xid = QEDF_MIN_XID;
 186
 187         for (i = 0; i < num_ios; i++) {
 188                 io_req = &cmgr->cmds[i];
 189                 INIT_DELAYED_WORK(&io_req->timeout_work, qedf_cmd_timeout);
 190
 191                 io_req->xid = xid++;
 192
 193                 INIT_DELAYED_WORK(&io_req->rrq_work, qedf_handle_rrq);
 194
 195                 /* Allocate DMA memory to hold sense buffer */
 196                 io_req->sense_buffer = dma_alloc_coherent(&qedf->pdev->dev,
 197                     QEDF_SCSI_SENSE_BUFFERSIZE, &io_req->sense_buffer_dma,
 198                     GFP_KERNEL);
 199                 if (!io_req->sense_buffer)
 200                         goto mem_err;
 201
 202                 /* Allocate task parameters to pass to f/w init funcions */
 203                 io_req->task_params = kzalloc(sizeof(*io_req->task_params),
 204                                               GFP_KERNEL);
 205                 if (!io_req->task_params) {
 206                         QEDF_ERR(&(qedf->dbg_ctx),
 207                                  "Failed to allocate task_params for xid=0x%x\n",
 208                                  i);
 209                         goto mem_err;
 210                 }
 211
 212                 /*
 213                  * Allocate scatter/gather list info to pass to f/w init
 214                  * functions.
 215                  */
 216                 io_req->sgl_task_params = kzalloc(
 217                     sizeof(struct scsi_sgl_task_params), GFP_KERNEL);
 218                 if (!io_req->sgl_task_params) {
 219                         QEDF_ERR(&(qedf->dbg_ctx),
 220                                  "Failed to allocate sgl_task_params for xid=0x%x\n",
 221                                  i);
 222                         goto mem_err;
 223                 }
 224         }
 225
 226         /* Allocate pool of io_bdts - one for each qedf_ioreq */
 227         cmgr->io_bdt_pool = kmalloc_array(num_ios, sizeof(struct io_bdt *),
 228             GFP_KERNEL);
 229
 230         if (!cmgr->io_bdt_pool) {
 231                 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc io_bdt_pool.\n");
 232                 goto mem_err;
 233         }
 234
 235         for (i = 0; i < num_ios; i++) {
 236                 cmgr->io_bdt_pool[i] = kmalloc(sizeof(struct io_bdt),
 237                     GFP_KERNEL);
 238                 if (!cmgr->io_bdt_pool[i]) {
 239                         QEDF_WARN(&(qedf->dbg_ctx),
 240                                   "Failed to alloc io_bdt_pool[%d].\n", i);
 241                         goto mem_err;
 242                 }
 243         }
 244
 245         for (i = 0; i < num_ios; i++) {
 246                 bdt_info = cmgr->io_bdt_pool[i];
 247                 bdt_info->bd_tbl = dma_alloc_coherent(&qedf->pdev->dev,
 248                     QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge),
 249                     &bdt_info->bd_tbl_dma, GFP_KERNEL);
 250                 if (!bdt_info->bd_tbl) {
 251                         QEDF_WARN(&(qedf->dbg_ctx),
 252                                   "Failed to alloc bdt_tbl[%d].\n", i);
 253                         goto mem_err;
 254                 }
 255         }
 256         atomic_set(&cmgr->free_list_cnt, num_ios);
 257         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 258             "cmgr->free_list_cnt=%d.\n",
 259             atomic_read(&cmgr->free_list_cnt));
 260
 261         return cmgr;
 262
 263 mem_err:
 264         qedf_cmd_mgr_free(cmgr);
 265         return NULL;
 266 }
 267
 268 struct qedf_ioreq *qedf_alloc_cmd(struct qedf_rport *fcport, u8 cmd_type)
 269 {
 270         struct qedf_ctx *qedf = fcport->qedf;
 271         struct qedf_cmd_mgr *cmd_mgr = qedf->cmd_mgr;
 272         struct qedf_ioreq *io_req = NULL;
 273         struct io_bdt *bd_tbl;
 274         u16 xid;
 275         uint32_t free_sqes;
 276         int i;
 277         unsigned long flags;
 278
 279         free_sqes = atomic_read(&fcport->free_sqes);
 280
 281         if (!free_sqes) {
 282                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 283                     "Returning NULL, free_sqes=%d.\n ",
 284                     free_sqes);
 285                 goto out_failed;
 286         }
 287
 288         /* Limit the number of outstanding R/W tasks */
 289         if ((atomic_read(&fcport->num_active_ios) >=
 290             NUM_RW_TASKS_PER_CONNECTION)) {
 291                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 292                     "Returning NULL, num_active_ios=%d.\n",
 293                     atomic_read(&fcport->num_active_ios));
 294                 goto out_failed;
 295         }
 296
 297         /* Limit global TIDs certain tasks */
 298         if (atomic_read(&cmd_mgr->free_list_cnt) <= GBL_RSVD_TASKS) {
 299                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 300                     "Returning NULL, free_list_cnt=%d.\n",
 301                     atomic_read(&cmd_mgr->free_list_cnt));
 302                 goto out_failed;
 303         }
 304
 305         spin_lock_irqsave(&cmd_mgr->lock, flags);
 306         for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
 307                 io_req = &cmd_mgr->cmds[cmd_mgr->idx];
 308                 cmd_mgr->idx++;
 309                 if (cmd_mgr->idx == FCOE_PARAMS_NUM_TASKS)
 310                         cmd_mgr->idx = 0;
 311
 312                 /* Check to make sure command was previously freed */
 313                 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags))
 314                         break;
 315         }
 316
 317         if (i == FCOE_PARAMS_NUM_TASKS) {
 318                 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
 319                 goto out_failed;
 320         }
 321
 322         set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
 323         spin_unlock_irqrestore(&cmd_mgr->lock, flags);
 324
 325         atomic_inc(&fcport->num_active_ios);
 326         atomic_dec(&fcport->free_sqes);
 327         xid = io_req->xid;
 328         atomic_dec(&cmd_mgr->free_list_cnt);
 329
 330         io_req->cmd_mgr = cmd_mgr;
 331         io_req->fcport = fcport;
 332
 333         /* Hold the io_req against deletion */
 334         kref_init(&io_req->refcount);
 335
 336         /* Bind io_bdt for this io_req */
 337         /* Have a static link between io_req and io_bdt_pool */
 338         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 339         if (bd_tbl == NULL) {
 340                 QEDF_ERR(&(qedf->dbg_ctx), "bd_tbl is NULL, xid=%x.\n", xid);
 341                 kref_put(&io_req->refcount, qedf_release_cmd);
 342                 goto out_failed;
 343         }
 344         bd_tbl->io_req = io_req;
 345         io_req->cmd_type = cmd_type;
 346         io_req->tm_flags = 0;
 347
 348         /* Reset sequence offset data */
 349         io_req->rx_buf_off = 0;
 350         io_req->tx_buf_off = 0;
 351         io_req->rx_id = 0xffff; /* No OX_ID */
 352
 353         return io_req;
 354
 355 out_failed:
 356         /* Record failure for stats and return NULL to caller */
 357         qedf->alloc_failures++;
 358         return NULL;
 359 }
 360
 361 static void qedf_free_mp_resc(struct qedf_ioreq *io_req)
 362 {
 363         struct qedf_mp_req *mp_req = &(io_req->mp_req);
 364         struct qedf_ctx *qedf = io_req->fcport->qedf;
 365         uint64_t sz = sizeof(struct scsi_sge);
 366
 367         /* clear tm flags */
 368         if (mp_req->mp_req_bd) {
 369                 dma_free_coherent(&qedf->pdev->dev, sz,
 370                     mp_req->mp_req_bd, mp_req->mp_req_bd_dma);
 371                 mp_req->mp_req_bd = NULL;
 372         }
 373         if (mp_req->mp_resp_bd) {
 374                 dma_free_coherent(&qedf->pdev->dev, sz,
 375                     mp_req->mp_resp_bd, mp_req->mp_resp_bd_dma);
 376                 mp_req->mp_resp_bd = NULL;
 377         }
 378         if (mp_req->req_buf) {
 379                 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
 380                     mp_req->req_buf, mp_req->req_buf_dma);
 381                 mp_req->req_buf = NULL;
 382         }
 383         if (mp_req->resp_buf) {
 384                 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
 385                     mp_req->resp_buf, mp_req->resp_buf_dma);
 386                 mp_req->resp_buf = NULL;
 387         }
 388 }
 389
 390 void qedf_release_cmd(struct kref *ref)
 391 {
 392         struct qedf_ioreq *io_req =
 393             container_of(ref, struct qedf_ioreq, refcount);
 394         struct qedf_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 395         struct qedf_rport *fcport = io_req->fcport;
 396
 397         if (io_req->cmd_type == QEDF_ELS ||
 398             io_req->cmd_type == QEDF_TASK_MGMT_CMD)
 399                 qedf_free_mp_resc(io_req);
 400
 401         atomic_inc(&cmd_mgr->free_list_cnt);
 402         atomic_dec(&fcport->num_active_ios);
 403         if (atomic_read(&fcport->num_active_ios) < 0)
 404                 QEDF_WARN(&(fcport->qedf->dbg_ctx), "active_ios < 0.\n");
 405
 406         /* Increment task retry identifier now that the request is released */
 407         io_req->task_retry_identifier++;
 408
 409         clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
 410 }
 411
 412 static int qedf_split_bd(struct qedf_ioreq *io_req, u64 addr, int sg_len,
 413         int bd_index)
 414 {
 415         struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
 416         int frag_size, sg_frags;
 417
 418         sg_frags = 0;
 419         while (sg_len) {
 420                 if (sg_len > QEDF_BD_SPLIT_SZ)
 421                         frag_size = QEDF_BD_SPLIT_SZ;
 422                 else
 423                         frag_size = sg_len;
 424                 bd[bd_index + sg_frags].sge_addr.lo = U64_LO(addr);
 425                 bd[bd_index + sg_frags].sge_addr.hi = U64_HI(addr);
 426                 bd[bd_index + sg_frags].sge_len = (uint16_t)frag_size;
 427
 428                 addr += (u64)frag_size;
 429                 sg_frags++;
 430                 sg_len -= frag_size;
 431         }
 432         return sg_frags;
 433 }
 434
 435 static int qedf_map_sg(struct qedf_ioreq *io_req)
 436 {
 437         struct scsi_cmnd *sc = io_req->sc_cmd;
 438         struct Scsi_Host *host = sc->device->host;
 439         struct fc_lport *lport = shost_priv(host);
 440         struct qedf_ctx *qedf = lport_priv(lport);
 441         struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
 442         struct scatterlist *sg;
 443         int byte_count = 0;
 444         int sg_count = 0;
 445         int bd_count = 0;
 446         int sg_frags;
 447         unsigned int sg_len;
 448         u64 addr, end_addr;
 449         int i;
 450
 451         sg_count = dma_map_sg(&qedf->pdev->dev, scsi_sglist(sc),
 452             scsi_sg_count(sc), sc->sc_data_direction);
 453
 454         sg = scsi_sglist(sc);
 455
 456         /*
 457          * New condition to send single SGE as cached-SGL with length less
 458          * than 64k.
 459          */
 460         if ((sg_count == 1) && (sg_dma_len(sg) <=
 461             QEDF_MAX_SGLEN_FOR_CACHESGL)) {
 462                 sg_len = sg_dma_len(sg);
 463                 addr = (u64)sg_dma_address(sg);
 464
 465                 bd[bd_count].sge_addr.lo = (addr & 0xffffffff);
 466                 bd[bd_count].sge_addr.hi = (addr >> 32);
 467                 bd[bd_count].sge_len = (u16)sg_len;
 468
 469                 return ++bd_count;
 470         }
 471
 472         scsi_for_each_sg(sc, sg, sg_count, i) {
 473                 sg_len = sg_dma_len(sg);
 474                 addr = (u64)sg_dma_address(sg);
 475                 end_addr = (u64)(addr + sg_len);
 476
 477                 /*
 478                  * First s/g element in the list so check if the end_addr
 479                  * is paged aligned. Also check to make sure the length is
 480                  * at least page size.
 481                  */
 482                 if ((i == 0) && (sg_count > 1) &&
 483                     ((end_addr % QEDF_PAGE_SIZE) ||
 484                     sg_len < QEDF_PAGE_SIZE))
 485                         io_req->use_slowpath = true;
 486                 /*
 487                  * Last s/g element so check if the start address is paged
 488                  * aligned.
 489                  */
 490                 else if ((i == (sg_count - 1)) && (sg_count > 1) &&
 491                     (addr % QEDF_PAGE_SIZE))
 492                         io_req->use_slowpath = true;
 493                 /*
 494                  * Intermediate s/g element so check if start and end address
 495                  * is page aligned.
 496                  */
 497                 else if ((i != 0) && (i != (sg_count - 1)) &&
 498                     ((addr % QEDF_PAGE_SIZE) || (end_addr % QEDF_PAGE_SIZE)))
 499                         io_req->use_slowpath = true;
 500
 501                 if (sg_len > QEDF_MAX_BD_LEN) {
 502                         sg_frags = qedf_split_bd(io_req, addr, sg_len,
 503                             bd_count);
 504                 } else {
 505                         sg_frags = 1;
 506                         bd[bd_count].sge_addr.lo = U64_LO(addr);
 507                         bd[bd_count].sge_addr.hi  = U64_HI(addr);
 508                         bd[bd_count].sge_len = (uint16_t)sg_len;
 509                 }
 510
 511                 bd_count += sg_frags;
 512                 byte_count += sg_len;
 513         }
 514
 515         if (byte_count != scsi_bufflen(sc))
 516                 QEDF_ERR(&(qedf->dbg_ctx), "byte_count = %d != "
 517                           "scsi_bufflen = %d, task_id = 0x%x.\n", byte_count,
 518                            scsi_bufflen(sc), io_req->xid);
 519
 520         return bd_count;
 521 }
 522
 523 static int qedf_build_bd_list_from_sg(struct qedf_ioreq *io_req)
 524 {
 525         struct scsi_cmnd *sc = io_req->sc_cmd;
 526         struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
 527         int bd_count;
 528
 529         if (scsi_sg_count(sc)) {
 530                 bd_count = qedf_map_sg(io_req);
 531                 if (bd_count == 0)
 532                         return -ENOMEM;
 533         } else {
 534                 bd_count = 0;
 535                 bd[0].sge_addr.lo = bd[0].sge_addr.hi = 0;
 536                 bd[0].sge_len = 0;
 537         }
 538         io_req->bd_tbl->bd_valid = bd_count;
 539
 540         return 0;
 541 }
 542
 543 static void qedf_build_fcp_cmnd(struct qedf_ioreq *io_req,
 544                                   struct fcp_cmnd *fcp_cmnd)
 545 {
 546         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 547
 548         /* fcp_cmnd is 32 bytes */
 549         memset(fcp_cmnd, 0, FCP_CMND_LEN);
 550
 551         /* 8 bytes: SCSI LUN info */
 552         int_to_scsilun(sc_cmd->device->lun,
 553                         (struct scsi_lun *)&fcp_cmnd->fc_lun);
 554
 555         /* 4 bytes: flag info */
 556         fcp_cmnd->fc_pri_ta = 0;
 557         fcp_cmnd->fc_tm_flags = io_req->tm_flags;
 558         fcp_cmnd->fc_flags = io_req->io_req_flags;
 559         fcp_cmnd->fc_cmdref = 0;
 560
 561         /* Populate data direction */
 562         if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
 563                 fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
 564         } else {
 565                 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE)
 566                         fcp_cmnd->fc_flags |= FCP_CFL_WRDATA;
 567                 else if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE)
 568                         fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
 569         }
 570
 571         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
 572
 573         /* 16 bytes: CDB information */
 574         if (io_req->cmd_type != QEDF_TASK_MGMT_CMD)
 575                 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
 576
 577         /* 4 bytes: FCP data length */
 578         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
 579 }
 580
 581 static void  qedf_init_task(struct qedf_rport *fcport, struct fc_lport *lport,
 582         struct qedf_ioreq *io_req, struct fcoe_task_context *task_ctx,
 583         struct fcoe_wqe *sqe)
 584 {
 585         enum fcoe_task_type task_type;
 586         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 587         struct io_bdt *bd_tbl = io_req->bd_tbl;
 588         u8 fcp_cmnd[32];
 589         u32 tmp_fcp_cmnd[8];
 590         int bd_count = 0;
 591         struct qedf_ctx *qedf = fcport->qedf;
 592         uint16_t cq_idx = smp_processor_id() % qedf->num_queues;
 593         struct regpair sense_data_buffer_phys_addr;
 594         u32 tx_io_size = 0;
 595         u32 rx_io_size = 0;
 596         int i, cnt;
 597
 598         /* Note init_initiator_rw_fcoe_task memsets the task context */
 599         io_req->task = task_ctx;
 600         memset(task_ctx, 0, sizeof(struct fcoe_task_context));
 601         memset(io_req->task_params, 0, sizeof(struct fcoe_task_params));
 602         memset(io_req->sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
 603
 604         /* Set task type bassed on DMA directio of command */
 605         if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
 606                 task_type = FCOE_TASK_TYPE_READ_INITIATOR;
 607         } else {
 608                 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
 609                         task_type = FCOE_TASK_TYPE_WRITE_INITIATOR;
 610                         tx_io_size = io_req->data_xfer_len;
 611                 } else {
 612                         task_type = FCOE_TASK_TYPE_READ_INITIATOR;
 613                         rx_io_size = io_req->data_xfer_len;
 614                 }
 615         }
 616
 617         /* Setup the fields for fcoe_task_params */
 618         io_req->task_params->context = task_ctx;
 619         io_req->task_params->sqe = sqe;
 620         io_req->task_params->task_type = task_type;
 621         io_req->task_params->tx_io_size = tx_io_size;
 622         io_req->task_params->rx_io_size = rx_io_size;
 623         io_req->task_params->conn_cid = fcport->fw_cid;
 624         io_req->task_params->itid = io_req->xid;
 625         io_req->task_params->cq_rss_number = cq_idx;
 626         io_req->task_params->is_tape_device = fcport->dev_type;
 627
 628         /* Fill in information for scatter/gather list */
 629         if (io_req->cmd_type != QEDF_TASK_MGMT_CMD) {
 630                 bd_count = bd_tbl->bd_valid;
 631                 io_req->sgl_task_params->sgl = bd_tbl->bd_tbl;
 632                 io_req->sgl_task_params->sgl_phys_addr.lo =
 633                         U64_LO(bd_tbl->bd_tbl_dma);
 634                 io_req->sgl_task_params->sgl_phys_addr.hi =
 635                         U64_HI(bd_tbl->bd_tbl_dma);
 636                 io_req->sgl_task_params->num_sges = bd_count;
 637                 io_req->sgl_task_params->total_buffer_size =
 638                     scsi_bufflen(io_req->sc_cmd);
 639                 io_req->sgl_task_params->small_mid_sge =
 640                         io_req->use_slowpath;
 641         }
 642
 643         /* Fill in physical address of sense buffer */
 644         sense_data_buffer_phys_addr.lo = U64_LO(io_req->sense_buffer_dma);
 645         sense_data_buffer_phys_addr.hi = U64_HI(io_req->sense_buffer_dma);
 646
 647         /* fill FCP_CMND IU */
 648         qedf_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tmp_fcp_cmnd);
 649
 650         /* Swap fcp_cmnd since FC is big endian */
 651         cnt = sizeof(struct fcp_cmnd) / sizeof(u32);
 652         for (i = 0; i < cnt; i++) {
 653                 tmp_fcp_cmnd[i] = cpu_to_be32(tmp_fcp_cmnd[i]);
 654         }
 655         memcpy(fcp_cmnd, tmp_fcp_cmnd, sizeof(struct fcp_cmnd));
 656
 657         init_initiator_rw_fcoe_task(io_req->task_params,
 658                                     io_req->sgl_task_params,
 659                                     sense_data_buffer_phys_addr,
 660                                     io_req->task_retry_identifier, fcp_cmnd);
 661
 662         /* Increment SGL type counters */
 663         if (bd_count == 1) {
 664                 qedf->single_sge_ios++;
 665                 io_req->sge_type = QEDF_IOREQ_SINGLE_SGE;
 666         } else if (io_req->use_slowpath) {
 667                 qedf->slow_sge_ios++;
 668                 io_req->sge_type = QEDF_IOREQ_SLOW_SGE;
 669         } else {
 670                 qedf->fast_sge_ios++;
 671                 io_req->sge_type = QEDF_IOREQ_FAST_SGE;
 672         }
 673 }
 674
 675 void qedf_init_mp_task(struct qedf_ioreq *io_req,
 676         struct fcoe_task_context *task_ctx, struct fcoe_wqe *sqe)
 677 {
 678         struct qedf_mp_req *mp_req = &(io_req->mp_req);
 679         struct qedf_rport *fcport = io_req->fcport;
 680         struct qedf_ctx *qedf = io_req->fcport->qedf;
 681         struct fc_frame_header *fc_hdr;
 682         struct fcoe_tx_mid_path_params task_fc_hdr;
 683         struct scsi_sgl_task_params tx_sgl_task_params;
 684         struct scsi_sgl_task_params rx_sgl_task_params;
 685
 686         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
 687                   "Initializing MP task for cmd_type=%d\n",
 688                   io_req->cmd_type);
 689
 690         qedf->control_requests++;
 691
 692         memset(&tx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
 693         memset(&rx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
 694         memset(task_ctx, 0, sizeof(struct fcoe_task_context));
 695         memset(&task_fc_hdr, 0, sizeof(struct fcoe_tx_mid_path_params));
 696
 697         /* Setup the task from io_req for easy reference */
 698         io_req->task = task_ctx;
 699
 700         /* Setup the fields for fcoe_task_params */
 701         io_req->task_params->context = task_ctx;
 702         io_req->task_params->sqe = sqe;
 703         io_req->task_params->task_type = FCOE_TASK_TYPE_MIDPATH;
 704         io_req->task_params->tx_io_size = io_req->data_xfer_len;
 705         /* rx_io_size tells the f/w how large a response buffer we have */
 706         io_req->task_params->rx_io_size = PAGE_SIZE;
 707         io_req->task_params->conn_cid = fcport->fw_cid;
 708         io_req->task_params->itid = io_req->xid;
 709         /* Return middle path commands on CQ 0 */
 710         io_req->task_params->cq_rss_number = 0;
 711         io_req->task_params->is_tape_device = fcport->dev_type;
 712
 713         fc_hdr = &(mp_req->req_fc_hdr);
 714         /* Set OX_ID and RX_ID based on driver task id */
 715         fc_hdr->fh_ox_id = io_req->xid;
 716         fc_hdr->fh_rx_id = htons(0xffff);
 717
 718         /* Set up FC header information */
 719         task_fc_hdr.parameter = fc_hdr->fh_parm_offset;
 720         task_fc_hdr.r_ctl = fc_hdr->fh_r_ctl;
 721         task_fc_hdr.type = fc_hdr->fh_type;
 722         task_fc_hdr.cs_ctl = fc_hdr->fh_cs_ctl;
 723         task_fc_hdr.df_ctl = fc_hdr->fh_df_ctl;
 724         task_fc_hdr.rx_id = fc_hdr->fh_rx_id;
 725         task_fc_hdr.ox_id = fc_hdr->fh_ox_id;
 726
 727         /* Set up s/g list parameters for request buffer */
 728         tx_sgl_task_params.sgl = mp_req->mp_req_bd;
 729         tx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_req_bd_dma);
 730         tx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_req_bd_dma);
 731         tx_sgl_task_params.num_sges = 1;
 732         /* Set PAGE_SIZE for now since sg element is that size ??? */
 733         tx_sgl_task_params.total_buffer_size = io_req->data_xfer_len;
 734         tx_sgl_task_params.small_mid_sge = 0;
 735
 736         /* Set up s/g list parameters for request buffer */
 737         rx_sgl_task_params.sgl = mp_req->mp_resp_bd;
 738         rx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_resp_bd_dma);
 739         rx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_resp_bd_dma);
 740         rx_sgl_task_params.num_sges = 1;
 741         /* Set PAGE_SIZE for now since sg element is that size ??? */
 742         rx_sgl_task_params.total_buffer_size = PAGE_SIZE;
 743         rx_sgl_task_params.small_mid_sge = 0;
 744
 745
 746         /*
 747          * Last arg is 0 as previous code did not set that we wanted the
 748          * fc header information.
 749          */
 750         init_initiator_midpath_unsolicited_fcoe_task(io_req->task_params,
 751                                                      &task_fc_hdr,
 752                                                      &tx_sgl_task_params,
 753                                                      &rx_sgl_task_params, 0);
 754
 755         /* Midpath requests always consume 1 SGE */
 756         qedf->single_sge_ios++;
 757 }
 758
 759 /* Presumed that fcport->rport_lock is held */
 760 u16 qedf_get_sqe_idx(struct qedf_rport *fcport)
 761 {
 762         uint16_t total_sqe = (fcport->sq_mem_size)/(sizeof(struct fcoe_wqe));
 763         u16 rval;
 764
 765         rval = fcport->sq_prod_idx;
 766
 767         /* Adjust ring index */
 768         fcport->sq_prod_idx++;
 769         fcport->fw_sq_prod_idx++;
 770         if (fcport->sq_prod_idx == total_sqe)
 771                 fcport->sq_prod_idx = 0;
 772
 773         return rval;
 774 }
 775
 776 void qedf_ring_doorbell(struct qedf_rport *fcport)
 777 {
 778         struct fcoe_db_data dbell = { 0 };
 779
 780         dbell.agg_flags = 0;
 781
 782         dbell.params |= DB_DEST_XCM << FCOE_DB_DATA_DEST_SHIFT;
 783         dbell.params |= DB_AGG_CMD_SET << FCOE_DB_DATA_AGG_CMD_SHIFT;
 784         dbell.params |= DQ_XCM_FCOE_SQ_PROD_CMD <<
 785             FCOE_DB_DATA_AGG_VAL_SEL_SHIFT;
 786
 787         dbell.sq_prod = fcport->fw_sq_prod_idx;
 788         writel(*(u32 *)&dbell, fcport->p_doorbell);
 789         /* Make sure SQ index is updated so f/w prcesses requests in order */
 790         wmb();
 791         mmiowb();
 792 }
 793
 794 static void qedf_trace_io(struct qedf_rport *fcport, struct qedf_ioreq *io_req,
 795                           int8_t direction)
 796 {
 797         struct qedf_ctx *qedf = fcport->qedf;
 798         struct qedf_io_log *io_log;
 799         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 800         unsigned long flags;
 801         uint8_t op;
 802
 803         spin_lock_irqsave(&qedf->io_trace_lock, flags);
 804
 805         io_log = &qedf->io_trace_buf[qedf->io_trace_idx];
 806         io_log->direction = direction;
 807         io_log->task_id = io_req->xid;
 808         io_log->port_id = fcport->rdata->ids.port_id;
 809         io_log->lun = sc_cmd->device->lun;
 810         io_log->op = op = sc_cmd->cmnd[0];
 811         io_log->lba[0] = sc_cmd->cmnd[2];
 812         io_log->lba[1] = sc_cmd->cmnd[3];
 813         io_log->lba[2] = sc_cmd->cmnd[4];
 814         io_log->lba[3] = sc_cmd->cmnd[5];
 815         io_log->bufflen = scsi_bufflen(sc_cmd);
 816         io_log->sg_count = scsi_sg_count(sc_cmd);
 817         io_log->result = sc_cmd->result;
 818         io_log->jiffies = jiffies;
 819         io_log->refcount = kref_read(&io_req->refcount);
 820
 821         if (direction == QEDF_IO_TRACE_REQ) {
 822                 /* For requests we only care abot the submission CPU */
 823                 io_log->req_cpu = io_req->cpu;
 824                 io_log->int_cpu = 0;
 825                 io_log->rsp_cpu = 0;
 826         } else if (direction == QEDF_IO_TRACE_RSP) {
 827                 io_log->req_cpu = io_req->cpu;
 828                 io_log->int_cpu = io_req->int_cpu;
 829                 io_log->rsp_cpu = smp_processor_id();
 830         }
 831
 832         io_log->sge_type = io_req->sge_type;
 833
 834         qedf->io_trace_idx++;
 835         if (qedf->io_trace_idx == QEDF_IO_TRACE_SIZE)
 836                 qedf->io_trace_idx = 0;
 837
 838         spin_unlock_irqrestore(&qedf->io_trace_lock, flags);
 839 }
 840
 841 int qedf_post_io_req(struct qedf_rport *fcport, struct qedf_ioreq *io_req)
 842 {
 843         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 844         struct Scsi_Host *host = sc_cmd->device->host;
 845         struct fc_lport *lport = shost_priv(host);
 846         struct qedf_ctx *qedf = lport_priv(lport);
 847         struct fcoe_task_context *task_ctx;
 848         u16 xid;
 849         enum fcoe_task_type req_type = 0;
 850         struct fcoe_wqe *sqe;
 851         u16 sqe_idx;
 852
 853         /* Initialize rest of io_req fileds */
 854         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
 855         sc_cmd->SCp.ptr = (char *)io_req;
 856         io_req->use_slowpath = false; /* Assume fast SGL by default */
 857
 858         /* Record which cpu this request is associated with */
 859         io_req->cpu = smp_processor_id();
 860
 861         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
 862                 req_type = FCOE_TASK_TYPE_READ_INITIATOR;
 863                 io_req->io_req_flags = QEDF_READ;
 864                 qedf->input_requests++;
 865         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
 866                 req_type = FCOE_TASK_TYPE_WRITE_INITIATOR;
 867                 io_req->io_req_flags = QEDF_WRITE;
 868                 qedf->output_requests++;
 869         } else {
 870                 io_req->io_req_flags = 0;
 871                 qedf->control_requests++;
 872         }
 873
 874         xid = io_req->xid;
 875
 876         /* Build buffer descriptor list for firmware from sg list */
 877         if (qedf_build_bd_list_from_sg(io_req)) {
 878                 QEDF_ERR(&(qedf->dbg_ctx), "BD list creation failed.\n");
 879                 kref_put(&io_req->refcount, qedf_release_cmd);
 880                 return -EAGAIN;
 881         }
 882
 883         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 884                 QEDF_ERR(&(qedf->dbg_ctx), "Session not offloaded yet.\n");
 885                 kref_put(&io_req->refcount, qedf_release_cmd);
 886         }
 887
 888         /* Obtain free SQE */
 889         sqe_idx = qedf_get_sqe_idx(fcport);
 890         sqe = &fcport->sq[sqe_idx];
 891         memset(sqe, 0, sizeof(struct fcoe_wqe));
 892
 893         /* Get the task context */
 894         task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
 895         if (!task_ctx) {
 896                 QEDF_WARN(&(qedf->dbg_ctx), "task_ctx is NULL, xid=%d.\n",
 897                            xid);
 898                 kref_put(&io_req->refcount, qedf_release_cmd);
 899                 return -EINVAL;
 900         }
 901
 902         qedf_init_task(fcport, lport, io_req, task_ctx, sqe);
 903
 904         /* Ring doorbell */
 905         qedf_ring_doorbell(fcport);
 906
 907         if (qedf_io_tracing && io_req->sc_cmd)
 908                 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_REQ);
 909
 910         return false;
 911 }
 912
 913 int
 914 qedf_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc_cmd)
 915 {
 916         struct fc_lport *lport = shost_priv(host);
 917         struct qedf_ctx *qedf = lport_priv(lport);
 918         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
 919         struct fc_rport_libfc_priv *rp = rport->dd_data;
 920         struct qedf_rport *fcport = rport->dd_data;
 921         struct qedf_ioreq *io_req;
 922         int rc = 0;
 923         int rval;
 924         unsigned long flags = 0;
 925
 926
 927         if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
 928             test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
 929                 sc_cmd->result = DID_NO_CONNECT << 16;
 930                 sc_cmd->scsi_done(sc_cmd);
 931                 return 0;
 932         }
 933
 934         rval = fc_remote_port_chkready(rport);
 935         if (rval) {
 936                 sc_cmd->result = rval;
 937                 sc_cmd->scsi_done(sc_cmd);
 938                 return 0;
 939         }
 940
 941         /* Retry command if we are doing a qed drain operation */
 942         if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
 943                 rc = SCSI_MLQUEUE_HOST_BUSY;
 944                 goto exit_qcmd;
 945         }
 946
 947         if (lport->state != LPORT_ST_READY ||
 948             atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
 949                 rc = SCSI_MLQUEUE_HOST_BUSY;
 950                 goto exit_qcmd;
 951         }
 952
 953         /* rport and tgt are allocated together, so tgt should be non-NULL */
 954         fcport = (struct qedf_rport *)&rp[1];
 955
 956         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
 957                 /*
 958                  * Session is not offloaded yet. Let SCSI-ml retry
 959                  * the command.
 960                  */
 961                 rc = SCSI_MLQUEUE_TARGET_BUSY;
 962                 goto exit_qcmd;
 963         }
 964         if (fcport->retry_delay_timestamp) {
 965                 if (time_after(jiffies, fcport->retry_delay_timestamp)) {
 966                         fcport->retry_delay_timestamp = 0;
 967                 } else {
 968                         /* If retry_delay timer is active, flow off the ML */
 969                         rc = SCSI_MLQUEUE_TARGET_BUSY;
 970                         goto exit_qcmd;
 971                 }
 972         }
 973
 974         io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
 975         if (!io_req) {
 976                 rc = SCSI_MLQUEUE_HOST_BUSY;
 977                 goto exit_qcmd;
 978         }
 979
 980         io_req->sc_cmd = sc_cmd;
 981
 982         /* Take fcport->rport_lock for posting to fcport send queue */
 983         spin_lock_irqsave(&fcport->rport_lock, flags);
 984         if (qedf_post_io_req(fcport, io_req)) {
 985                 QEDF_WARN(&(qedf->dbg_ctx), "Unable to post io_req\n");
 986                 /* Return SQE to pool */
 987                 atomic_inc(&fcport->free_sqes);
 988                 rc = SCSI_MLQUEUE_HOST_BUSY;
 989         }
 990         spin_unlock_irqrestore(&fcport->rport_lock, flags);
 991
 992 exit_qcmd:
 993         return rc;
 994 }
 995
 996 static void qedf_parse_fcp_rsp(struct qedf_ioreq *io_req,
 997                                  struct fcoe_cqe_rsp_info *fcp_rsp)
 998 {
 999         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1000         struct qedf_ctx *qedf = io_req->fcport->qedf;
1001         u8 rsp_flags = fcp_rsp->rsp_flags.flags;
1002         int fcp_sns_len = 0;
1003         int fcp_rsp_len = 0;
1004         uint8_t *rsp_info, *sense_data;
1005
1006         io_req->fcp_status = FC_GOOD;
1007         io_req->fcp_resid = 0;
1008         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1009             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1010                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1011
1012         io_req->scsi_comp_flags = rsp_flags;
1013         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1014             fcp_rsp->scsi_status_code;
1015
1016         if (rsp_flags &
1017             FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID)
1018                 fcp_rsp_len = fcp_rsp->fcp_rsp_len;
1019
1020         if (rsp_flags &
1021             FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID)
1022                 fcp_sns_len = fcp_rsp->fcp_sns_len;
1023
1024         io_req->fcp_rsp_len = fcp_rsp_len;
1025         io_req->fcp_sns_len = fcp_sns_len;
1026         rsp_info = sense_data = io_req->sense_buffer;
1027
1028         /* fetch fcp_rsp_code */
1029         if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1030                 /* Only for task management function */
1031                 io_req->fcp_rsp_code = rsp_info[3];
1032                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1033                     "fcp_rsp_code = %d\n", io_req->fcp_rsp_code);
1034                 /* Adjust sense-data location. */
1035                 sense_data += fcp_rsp_len;
1036         }
1037
1038         if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1039                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1040                     "Truncating sense buffer\n");
1041                 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1042         }
1043
1044         memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1045         if (fcp_sns_len)
1046                 memcpy(sc_cmd->sense_buffer, sense_data,
1047                     fcp_sns_len);
1048 }
1049
1050 static void qedf_unmap_sg_list(struct qedf_ctx *qedf, struct qedf_ioreq *io_req)
1051 {
1052         struct scsi_cmnd *sc = io_req->sc_cmd;
1053
1054         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1055                 dma_unmap_sg(&qedf->pdev->dev, scsi_sglist(sc),
1056                     scsi_sg_count(sc), sc->sc_data_direction);
1057                 io_req->bd_tbl->bd_valid = 0;
1058         }
1059 }
1060
1061 void qedf_scsi_completion(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1062         struct qedf_ioreq *io_req)
1063 {
1064         u16 xid, rval;
1065         struct fcoe_task_context *task_ctx;
1066         struct scsi_cmnd *sc_cmd;
1067         struct fcoe_cqe_rsp_info *fcp_rsp;
1068         struct qedf_rport *fcport;
1069         int refcount;
1070         u16 scope, qualifier = 0;
1071         u8 fw_residual_flag = 0;
1072
1073         if (!io_req)
1074                 return;
1075         if (!cqe)
1076                 return;
1077
1078         xid = io_req->xid;
1079         task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
1080         sc_cmd = io_req->sc_cmd;
1081         fcp_rsp = &cqe->cqe_info.rsp_info;
1082
1083         if (!sc_cmd) {
1084                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1085                 return;
1086         }
1087
1088         if (!sc_cmd->SCp.ptr) {
1089                 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1090                     "another context.\n");
1091                 return;
1092         }
1093
1094         if (!sc_cmd->request) {
1095                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd->request is NULL, "
1096                     "sc_cmd=%p.\n", sc_cmd);
1097                 return;
1098         }
1099
1100         if (!sc_cmd->request->special) {
1101                 QEDF_WARN(&(qedf->dbg_ctx), "request->special is NULL so "
1102                     "request not valid, sc_cmd=%p.\n", sc_cmd);
1103                 return;
1104         }
1105
1106         if (!sc_cmd->request->q) {
1107                 QEDF_WARN(&(qedf->dbg_ctx), "request->q is NULL so request "
1108                    "is not valid, sc_cmd=%p.\n", sc_cmd);
1109                 return;
1110         }
1111
1112         fcport = io_req->fcport;
1113
1114         qedf_parse_fcp_rsp(io_req, fcp_rsp);
1115
1116         qedf_unmap_sg_list(qedf, io_req);
1117
1118         /* Check for FCP transport error */
1119         if (io_req->fcp_rsp_len > 3 && io_req->fcp_rsp_code) {
1120                 QEDF_ERR(&(qedf->dbg_ctx),
1121                     "FCP I/O protocol failure xid=0x%x fcp_rsp_len=%d "
1122                     "fcp_rsp_code=%d.\n", io_req->xid, io_req->fcp_rsp_len,
1123                     io_req->fcp_rsp_code);
1124                 sc_cmd->result = DID_BUS_BUSY << 16;
1125                 goto out;
1126         }
1127
1128         fw_residual_flag = GET_FIELD(cqe->cqe_info.rsp_info.fw_error_flags,
1129             FCOE_CQE_RSP_INFO_FW_UNDERRUN);
1130         if (fw_residual_flag) {
1131                 QEDF_ERR(&(qedf->dbg_ctx),
1132                     "Firmware detected underrun: xid=0x%x fcp_rsp.flags=0x%02x "
1133                     "fcp_resid=%d fw_residual=0x%x.\n", io_req->xid,
1134                     fcp_rsp->rsp_flags.flags, io_req->fcp_resid,
1135                     cqe->cqe_info.rsp_info.fw_residual);
1136
1137                 if (io_req->cdb_status == 0)
1138                         sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
1139                 else
1140                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1141
1142                 /* Abort the command since we did not get all the data */
1143                 init_completion(&io_req->abts_done);
1144                 rval = qedf_initiate_abts(io_req, true);
1145                 if (rval) {
1146                         QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1147                         sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
1148                 }
1149
1150                 /*
1151                  * Set resid to the whole buffer length so we won't try to resue
1152                  * any previously data.
1153                  */
1154                 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1155                 goto out;
1156         }
1157
1158         switch (io_req->fcp_status) {
1159         case FC_GOOD:
1160                 if (io_req->cdb_status == 0) {
1161                         /* Good I/O completion */
1162                         sc_cmd->result = DID_OK << 16;
1163                 } else {
1164                         refcount = kref_read(&io_req->refcount);
1165                         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1166                             "%d:0:%d:%d xid=0x%0x op=0x%02x "
1167                             "lba=%02x%02x%02x%02x cdb_status=%d "
1168                             "fcp_resid=0x%x refcount=%d.\n",
1169                             qedf->lport->host->host_no, sc_cmd->device->id,
1170                             sc_cmd->device->lun, io_req->xid,
1171                             sc_cmd->cmnd[0], sc_cmd->cmnd[2], sc_cmd->cmnd[3],
1172                             sc_cmd->cmnd[4], sc_cmd->cmnd[5],
1173                             io_req->cdb_status, io_req->fcp_resid,
1174                             refcount);
1175                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1176
1177                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1178                             io_req->cdb_status == SAM_STAT_BUSY) {
1179                                 /*
1180                                  * Check whether we need to set retry_delay at
1181                                  * all based on retry_delay module parameter
1182                                  * and the status qualifier.
1183                                  */
1184
1185                                 /* Upper 2 bits */
1186                                 scope = fcp_rsp->retry_delay_timer & 0xC000;
1187                                 /* Lower 14 bits */
1188                                 qualifier = fcp_rsp->retry_delay_timer & 0x3FFF;
1189
1190                                 if (qedf_retry_delay &&
1191                                     scope > 0 && qualifier > 0 &&
1192                                     qualifier <= 0x3FEF) {
1193                                         /* Check we don't go over the max */
1194                                         if (qualifier > QEDF_RETRY_DELAY_MAX)
1195                                                 qualifier =
1196                                                     QEDF_RETRY_DELAY_MAX;
1197                                         fcport->retry_delay_timestamp =
1198                                             jiffies + (qualifier * HZ / 10);
1199                                 }
1200                         }
1201                 }
1202                 if (io_req->fcp_resid)
1203                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1204                 break;
1205         default:
1206                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "fcp_status=%d.\n",
1207                            io_req->fcp_status);
1208                 break;
1209         }
1210
1211 out:
1212         if (qedf_io_tracing)
1213                 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_RSP);
1214
1215         io_req->sc_cmd = NULL;
1216         sc_cmd->SCp.ptr =  NULL;
1217         sc_cmd->scsi_done(sc_cmd);
1218         kref_put(&io_req->refcount, qedf_release_cmd);
1219 }
1220
1221 /* Return a SCSI command in some other context besides a normal completion */
1222 void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
1223         int result)
1224 {
1225         u16 xid;
1226         struct scsi_cmnd *sc_cmd;
1227         int refcount;
1228
1229         if (!io_req)
1230                 return;
1231
1232         xid = io_req->xid;
1233         sc_cmd = io_req->sc_cmd;
1234
1235         if (!sc_cmd) {
1236                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1237                 return;
1238         }
1239
1240         if (!sc_cmd->SCp.ptr) {
1241                 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1242                     "another context.\n");
1243                 return;
1244         }
1245
1246         qedf_unmap_sg_list(qedf, io_req);
1247
1248         sc_cmd->result = result << 16;
1249         refcount = kref_read(&io_req->refcount);
1250         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "%d:0:%d:%d: Completing "
1251             "sc_cmd=%p result=0x%08x op=0x%02x lba=0x%02x%02x%02x%02x, "
1252             "allowed=%d retries=%d refcount=%d.\n",
1253             qedf->lport->host->host_no, sc_cmd->device->id,
1254             sc_cmd->device->lun, sc_cmd, sc_cmd->result, sc_cmd->cmnd[0],
1255             sc_cmd->cmnd[2], sc_cmd->cmnd[3], sc_cmd->cmnd[4],
1256             sc_cmd->cmnd[5], sc_cmd->allowed, sc_cmd->retries,
1257             refcount);
1258
1259         /*
1260          * Set resid to the whole buffer length so we won't try to resue any
1261          * previously read data
1262          */
1263         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1264
1265         if (qedf_io_tracing)
1266                 qedf_trace_io(io_req->fcport, io_req, QEDF_IO_TRACE_RSP);
1267
1268         io_req->sc_cmd = NULL;
1269         sc_cmd->SCp.ptr = NULL;
1270         sc_cmd->scsi_done(sc_cmd);
1271         kref_put(&io_req->refcount, qedf_release_cmd);
1272 }
1273
1274 /*
1275  * Handle warning type CQE completions. This is mainly used for REC timer
1276  * popping.
1277  */
1278 void qedf_process_warning_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1279         struct qedf_ioreq *io_req)
1280 {
1281         int rval, i;
1282         struct qedf_rport *fcport = io_req->fcport;
1283         u64 err_warn_bit_map;
1284         u8 err_warn = 0xff;
1285
1286         if (!cqe)
1287                 return;
1288
1289         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Warning CQE, "
1290                   "xid=0x%x\n", io_req->xid);
1291         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1292                   "err_warn_bitmap=%08x:%08x\n",
1293                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1294                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1295         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1296                   "rx_buff_off=%08x, rx_id=%04x\n",
1297                   le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1298                   le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1299                   le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1300
1301         /* Normalize the error bitmap value to an just an unsigned int */
1302         err_warn_bit_map = (u64)
1303             ((u64)cqe->cqe_info.err_info.err_warn_bitmap_hi << 32) |
1304             (u64)cqe->cqe_info.err_info.err_warn_bitmap_lo;
1305         for (i = 0; i < 64; i++) {
1306                 if (err_warn_bit_map & (u64)((u64)1 << i)) {
1307                         err_warn = i;
1308                         break;
1309                 }
1310         }
1311
1312         /* Check if REC TOV expired if this is a tape device */
1313         if (fcport->dev_type == QEDF_RPORT_TYPE_TAPE) {
1314                 if (err_warn ==
1315                     FCOE_WARNING_CODE_REC_TOV_TIMER_EXPIRATION) {
1316                         QEDF_ERR(&(qedf->dbg_ctx), "REC timer expired.\n");
1317                         if (!test_bit(QEDF_CMD_SRR_SENT, &io_req->flags)) {
1318                                 io_req->rx_buf_off =
1319                                     cqe->cqe_info.err_info.rx_buf_off;
1320                                 io_req->tx_buf_off =
1321                                     cqe->cqe_info.err_info.tx_buf_off;
1322                                 io_req->rx_id = cqe->cqe_info.err_info.rx_id;
1323                                 rval = qedf_send_rec(io_req);
1324                                 /*
1325                                  * We only want to abort the io_req if we
1326                                  * can't queue the REC command as we want to
1327                                  * keep the exchange open for recovery.
1328                                  */
1329                                 if (rval)
1330                                         goto send_abort;
1331                         }
1332                         return;
1333                 }
1334         }
1335
1336 send_abort:
1337         init_completion(&io_req->abts_done);
1338         rval = qedf_initiate_abts(io_req, true);
1339         if (rval)
1340                 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1341 }
1342
1343 /* Cleanup a command when we receive an error detection completion */
1344 void qedf_process_error_detect(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1345         struct qedf_ioreq *io_req)
1346 {
1347         int rval;
1348
1349         if (!cqe)
1350                 return;
1351
1352         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Error detection CQE, "
1353                   "xid=0x%x\n", io_req->xid);
1354         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1355                   "err_warn_bitmap=%08x:%08x\n",
1356                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1357                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1358         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1359                   "rx_buff_off=%08x, rx_id=%04x\n",
1360                   le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1361                   le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1362                   le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1363
1364         if (qedf->stop_io_on_error) {
1365                 qedf_stop_all_io(qedf);
1366                 return;
1367         }
1368
1369         init_completion(&io_req->abts_done);
1370         rval = qedf_initiate_abts(io_req, true);
1371         if (rval)
1372                 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1373 }
1374
1375 static void qedf_flush_els_req(struct qedf_ctx *qedf,
1376         struct qedf_ioreq *els_req)
1377 {
1378         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1379             "Flushing ELS request xid=0x%x refcount=%d.\n", els_req->xid,
1380             kref_read(&els_req->refcount));
1381
1382         /*
1383          * Need to distinguish this from a timeout when calling the
1384          * els_req->cb_func.
1385          */
1386         els_req->event = QEDF_IOREQ_EV_ELS_FLUSH;
1387
1388         /* Cancel the timer */
1389         cancel_delayed_work_sync(&els_req->timeout_work);
1390
1391         /* Call callback function to complete command */
1392         if (els_req->cb_func && els_req->cb_arg) {
1393                 els_req->cb_func(els_req->cb_arg);
1394                 els_req->cb_arg = NULL;
1395         }
1396
1397         /* Release kref for original initiate_els */
1398         kref_put(&els_req->refcount, qedf_release_cmd);
1399 }
1400
1401 /* A value of -1 for lun is a wild card that means flush all
1402  * active SCSI I/Os for the target.
1403  */
1404 void qedf_flush_active_ios(struct qedf_rport *fcport, int lun)
1405 {
1406         struct qedf_ioreq *io_req;
1407         struct qedf_ctx *qedf;
1408         struct qedf_cmd_mgr *cmd_mgr;
1409         int i, rc;
1410
1411         if (!fcport)
1412                 return;
1413
1414         qedf = fcport->qedf;
1415         cmd_mgr = qedf->cmd_mgr;
1416
1417         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Flush active i/o's.\n");
1418
1419         for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1420                 io_req = &cmd_mgr->cmds[i];
1421
1422                 if (!io_req)
1423                         continue;
1424                 if (io_req->fcport != fcport)
1425                         continue;
1426                 if (io_req->cmd_type == QEDF_ELS) {
1427                         rc = kref_get_unless_zero(&io_req->refcount);
1428                         if (!rc) {
1429                                 QEDF_ERR(&(qedf->dbg_ctx),
1430                                     "Could not get kref for io_req=0x%p.\n",
1431                                     io_req);
1432                                 continue;
1433                         }
1434                         qedf_flush_els_req(qedf, io_req);
1435                         /*
1436                          * Release the kref and go back to the top of the
1437                          * loop.
1438                          */
1439                         goto free_cmd;
1440                 }
1441
1442                 if (!io_req->sc_cmd)
1443                         continue;
1444                 if (lun > 0) {
1445                         if (io_req->sc_cmd->device->lun !=
1446                             (u64)lun)
1447                                 continue;
1448                 }
1449
1450                 /*
1451                  * Use kref_get_unless_zero in the unlikely case the command
1452                  * we're about to flush was completed in the normal SCSI path
1453                  */
1454                 rc = kref_get_unless_zero(&io_req->refcount);
1455                 if (!rc) {
1456                         QEDF_ERR(&(qedf->dbg_ctx), "Could not get kref for "
1457                             "io_req=0x%p\n", io_req);
1458                         continue;
1459                 }
1460                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1461                     "Cleanup xid=0x%x.\n", io_req->xid);
1462
1463                 /* Cleanup task and return I/O mid-layer */
1464                 qedf_initiate_cleanup(io_req, true);
1465
1466 free_cmd:
1467                 kref_put(&io_req->refcount, qedf_release_cmd);
1468         }
1469 }
1470
1471 /*
1472  * Initiate a ABTS middle path command. Note that we don't have to initialize
1473  * the task context for an ABTS task.
1474  */
1475 int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
1476 {
1477         struct fc_lport *lport;
1478         struct qedf_rport *fcport = io_req->fcport;
1479         struct fc_rport_priv *rdata = fcport->rdata;
1480         struct qedf_ctx *qedf = fcport->qedf;
1481         u16 xid;
1482         u32 r_a_tov = 0;
1483         int rc = 0;
1484         unsigned long flags;
1485         struct fcoe_wqe *sqe;
1486         u16 sqe_idx;
1487
1488         r_a_tov = rdata->r_a_tov;
1489         lport = qedf->lport;
1490
1491         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1492                 QEDF_ERR(&(qedf->dbg_ctx), "tgt not offloaded\n");
1493                 rc = 1;
1494                 goto abts_err;
1495         }
1496
1497         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
1498                 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
1499                 rc = 1;
1500                 goto abts_err;
1501         }
1502
1503         if (atomic_read(&qedf->link_down_tmo_valid) > 0) {
1504                 QEDF_ERR(&(qedf->dbg_ctx), "link_down_tmo active.\n");
1505                 rc = 1;
1506                 goto abts_err;
1507         }
1508
1509         /* Ensure room on SQ */
1510         if (!atomic_read(&fcport->free_sqes)) {
1511                 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
1512                 rc = 1;
1513                 goto abts_err;
1514         }
1515
1516
1517         kref_get(&io_req->refcount);
1518
1519         xid = io_req->xid;
1520         qedf->control_requests++;
1521         qedf->packet_aborts++;
1522
1523         /* Set the return CPU to be the same as the request one */
1524         io_req->cpu = smp_processor_id();
1525
1526         /* Set the command type to abort */
1527         io_req->cmd_type = QEDF_ABTS;
1528         io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
1529
1530         set_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1531         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "ABTS io_req xid = "
1532                    "0x%x\n", xid);
1533
1534         qedf_cmd_timer_set(qedf, io_req, QEDF_ABORT_TIMEOUT * HZ);
1535
1536         spin_lock_irqsave(&fcport->rport_lock, flags);
1537
1538         sqe_idx = qedf_get_sqe_idx(fcport);
1539         sqe = &fcport->sq[sqe_idx];
1540         memset(sqe, 0, sizeof(struct fcoe_wqe));
1541         io_req->task_params->sqe = sqe;
1542
1543         init_initiator_abort_fcoe_task(io_req->task_params);
1544         qedf_ring_doorbell(fcport);
1545
1546         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1547
1548         return rc;
1549 abts_err:
1550         /*
1551          * If the ABTS task fails to queue then we need to cleanup the
1552          * task at the firmware.
1553          */
1554         qedf_initiate_cleanup(io_req, return_scsi_cmd_on_abts);
1555         return rc;
1556 }
1557
1558 void qedf_process_abts_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1559         struct qedf_ioreq *io_req)
1560 {
1561         uint32_t r_ctl;
1562         uint16_t xid;
1563
1564         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "Entered with xid = "
1565                    "0x%x cmd_type = %d\n", io_req->xid, io_req->cmd_type);
1566
1567         cancel_delayed_work(&io_req->timeout_work);
1568
1569         xid = io_req->xid;
1570         r_ctl = cqe->cqe_info.abts_info.r_ctl;
1571
1572         switch (r_ctl) {
1573         case FC_RCTL_BA_ACC:
1574                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
1575                     "ABTS response - ACC Send RRQ after R_A_TOV\n");
1576                 io_req->event = QEDF_IOREQ_EV_ABORT_SUCCESS;
1577                 /*
1578                  * Dont release this cmd yet. It will be relesed
1579                  * after we get RRQ response
1580                  */
1581                 kref_get(&io_req->refcount);
1582                 queue_delayed_work(qedf->dpc_wq, &io_req->rrq_work,
1583                     msecs_to_jiffies(qedf->lport->r_a_tov));
1584                 break;
1585         /* For error cases let the cleanup return the command */
1586         case FC_RCTL_BA_RJT:
1587                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
1588                    "ABTS response - RJT\n");
1589                 io_req->event = QEDF_IOREQ_EV_ABORT_FAILED;
1590                 break;
1591         default:
1592                 QEDF_ERR(&(qedf->dbg_ctx), "Unknown ABTS response\n");
1593                 break;
1594         }
1595
1596         clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1597
1598         if (io_req->sc_cmd) {
1599                 if (io_req->return_scsi_cmd_on_abts)
1600                         qedf_scsi_done(qedf, io_req, DID_ERROR);
1601         }
1602
1603         /* Notify eh_abort handler that ABTS is complete */
1604         complete(&io_req->abts_done);
1605
1606         kref_put(&io_req->refcount, qedf_release_cmd);
1607 }
1608
1609 int qedf_init_mp_req(struct qedf_ioreq *io_req)
1610 {
1611         struct qedf_mp_req *mp_req;
1612         struct scsi_sge *mp_req_bd;
1613         struct scsi_sge *mp_resp_bd;
1614         struct qedf_ctx *qedf = io_req->fcport->qedf;
1615         dma_addr_t addr;
1616         uint64_t sz;
1617
1618         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_MP_REQ, "Entered.\n");
1619
1620         mp_req = (struct qedf_mp_req *)&(io_req->mp_req);
1621         memset(mp_req, 0, sizeof(struct qedf_mp_req));
1622
1623         if (io_req->cmd_type != QEDF_ELS) {
1624                 mp_req->req_len = sizeof(struct fcp_cmnd);
1625                 io_req->data_xfer_len = mp_req->req_len;
1626         } else
1627                 mp_req->req_len = io_req->data_xfer_len;
1628
1629         mp_req->req_buf = dma_alloc_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
1630             &mp_req->req_buf_dma, GFP_KERNEL);
1631         if (!mp_req->req_buf) {
1632                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req buffer\n");
1633                 qedf_free_mp_resc(io_req);
1634                 return -ENOMEM;
1635         }
1636
1637         mp_req->resp_buf = dma_alloc_coherent(&qedf->pdev->dev,
1638             QEDF_PAGE_SIZE, &mp_req->resp_buf_dma, GFP_KERNEL);
1639         if (!mp_req->resp_buf) {
1640                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc TM resp "
1641                           "buffer\n");
1642                 qedf_free_mp_resc(io_req);
1643                 return -ENOMEM;
1644         }
1645
1646         /* Allocate and map mp_req_bd and mp_resp_bd */
1647         sz = sizeof(struct scsi_sge);
1648         mp_req->mp_req_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
1649             &mp_req->mp_req_bd_dma, GFP_KERNEL);
1650         if (!mp_req->mp_req_bd) {
1651                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req bd\n");
1652                 qedf_free_mp_resc(io_req);
1653                 return -ENOMEM;
1654         }
1655
1656         mp_req->mp_resp_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
1657             &mp_req->mp_resp_bd_dma, GFP_KERNEL);
1658         if (!mp_req->mp_resp_bd) {
1659                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP resp bd\n");
1660                 qedf_free_mp_resc(io_req);
1661                 return -ENOMEM;
1662         }
1663
1664         /* Fill bd table */
1665         addr = mp_req->req_buf_dma;
1666         mp_req_bd = mp_req->mp_req_bd;
1667         mp_req_bd->sge_addr.lo = U64_LO(addr);
1668         mp_req_bd->sge_addr.hi = U64_HI(addr);
1669         mp_req_bd->sge_len = QEDF_PAGE_SIZE;
1670
1671         /*
1672          * MP buffer is either a task mgmt command or an ELS.
1673          * So the assumption is that it consumes a single bd
1674          * entry in the bd table
1675          */
1676         mp_resp_bd = mp_req->mp_resp_bd;
1677         addr = mp_req->resp_buf_dma;
1678         mp_resp_bd->sge_addr.lo = U64_LO(addr);
1679         mp_resp_bd->sge_addr.hi = U64_HI(addr);
1680         mp_resp_bd->sge_len = QEDF_PAGE_SIZE;
1681
1682         return 0;
1683 }
1684
1685 /*
1686  * Last ditch effort to clear the port if it's stuck. Used only after a
1687  * cleanup task times out.
1688  */
1689 static void qedf_drain_request(struct qedf_ctx *qedf)
1690 {
1691         if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
1692                 QEDF_ERR(&(qedf->dbg_ctx), "MCP drain already active.\n");
1693                 return;
1694         }
1695
1696         /* Set bit to return all queuecommand requests as busy */
1697         set_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
1698
1699         /* Call qed drain request for function. Should be synchronous */
1700         qed_ops->common->drain(qedf->cdev);
1701
1702         /* Settle time for CQEs to be returned */
1703         msleep(100);
1704
1705         /* Unplug and continue */
1706         clear_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
1707 }
1708
1709 /*
1710  * Returns SUCCESS if the cleanup task does not timeout, otherwise return
1711  * FAILURE.
1712  */
1713 int qedf_initiate_cleanup(struct qedf_ioreq *io_req,
1714         bool return_scsi_cmd_on_abts)
1715 {
1716         struct qedf_rport *fcport;
1717         struct qedf_ctx *qedf;
1718         uint16_t xid;
1719         struct fcoe_task_context *task;
1720         int tmo = 0;
1721         int rc = SUCCESS;
1722         unsigned long flags;
1723         struct fcoe_wqe *sqe;
1724         u16 sqe_idx;
1725
1726         fcport = io_req->fcport;
1727         if (!fcport) {
1728                 QEDF_ERR(NULL, "fcport is NULL.\n");
1729                 return SUCCESS;
1730         }
1731
1732         qedf = fcport->qedf;
1733         if (!qedf) {
1734                 QEDF_ERR(NULL, "qedf is NULL.\n");
1735                 return SUCCESS;
1736         }
1737
1738         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1739             test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags)) {
1740                 QEDF_ERR(&(qedf->dbg_ctx), "io_req xid=0x%x already in "
1741                           "cleanup processing or already completed.\n",
1742                           io_req->xid);
1743                 return SUCCESS;
1744         }
1745
1746         /* Ensure room on SQ */
1747         if (!atomic_read(&fcport->free_sqes)) {
1748                 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
1749                 return FAILED;
1750         }
1751
1752
1753         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid=0x%x\n",
1754             io_req->xid);
1755
1756         /* Cleanup cmds re-use the same TID as the original I/O */
1757         xid = io_req->xid;
1758         io_req->cmd_type = QEDF_CLEANUP;
1759         io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
1760
1761         /* Set the return CPU to be the same as the request one */
1762         io_req->cpu = smp_processor_id();
1763
1764         set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
1765
1766         task = qedf_get_task_mem(&qedf->tasks, xid);
1767
1768         init_completion(&io_req->tm_done);
1769
1770         spin_lock_irqsave(&fcport->rport_lock, flags);
1771
1772         sqe_idx = qedf_get_sqe_idx(fcport);
1773         sqe = &fcport->sq[sqe_idx];
1774         memset(sqe, 0, sizeof(struct fcoe_wqe));
1775         io_req->task_params->sqe = sqe;
1776
1777         init_initiator_cleanup_fcoe_task(io_req->task_params);
1778         qedf_ring_doorbell(fcport);
1779
1780         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1781
1782         tmo = wait_for_completion_timeout(&io_req->tm_done,
1783             QEDF_CLEANUP_TIMEOUT * HZ);
1784
1785         if (!tmo) {
1786                 rc = FAILED;
1787                 /* Timeout case */
1788                 QEDF_ERR(&(qedf->dbg_ctx), "Cleanup command timeout, "
1789                           "xid=%x.\n", io_req->xid);
1790                 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
1791                 /* Issue a drain request if cleanup task times out */
1792                 QEDF_ERR(&(qedf->dbg_ctx), "Issuing MCP drain request.\n");
1793                 qedf_drain_request(qedf);
1794         }
1795
1796         if (io_req->sc_cmd) {
1797                 if (io_req->return_scsi_cmd_on_abts)
1798                         qedf_scsi_done(qedf, io_req, DID_ERROR);
1799         }
1800
1801         if (rc == SUCCESS)
1802                 io_req->event = QEDF_IOREQ_EV_CLEANUP_SUCCESS;
1803         else
1804                 io_req->event = QEDF_IOREQ_EV_CLEANUP_FAILED;
1805
1806         return rc;
1807 }
1808
1809 void qedf_process_cleanup_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1810         struct qedf_ioreq *io_req)
1811 {
1812         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid = 0x%x\n",
1813                    io_req->xid);
1814
1815         clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
1816
1817         /* Complete so we can finish cleaning up the I/O */
1818         complete(&io_req->tm_done);
1819 }
1820
1821 static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
1822         uint8_t tm_flags)
1823 {
1824         struct qedf_ioreq *io_req;
1825         struct fcoe_task_context *task;
1826         struct qedf_ctx *qedf = fcport->qedf;
1827         struct fc_lport *lport = qedf->lport;
1828         int rc = 0;
1829         uint16_t xid;
1830         int tmo = 0;
1831         unsigned long flags;
1832         struct fcoe_wqe *sqe;
1833         u16 sqe_idx;
1834
1835         if (!sc_cmd) {
1836                 QEDF_ERR(&(qedf->dbg_ctx), "invalid arg\n");
1837                 return FAILED;
1838         }
1839
1840         if (!(test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags))) {
1841                 QEDF_ERR(&(qedf->dbg_ctx), "fcport not offloaded\n");
1842                 rc = FAILED;
1843                 return FAILED;
1844         }
1845
1846         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "portid = 0x%x "
1847                    "tm_flags = %d\n", fcport->rdata->ids.port_id, tm_flags);
1848
1849         io_req = qedf_alloc_cmd(fcport, QEDF_TASK_MGMT_CMD);
1850         if (!io_req) {
1851                 QEDF_ERR(&(qedf->dbg_ctx), "Failed TMF");
1852                 rc = -EAGAIN;
1853                 goto reset_tmf_err;
1854         }
1855
1856         /* Initialize rest of io_req fields */
1857         io_req->sc_cmd = sc_cmd;
1858         io_req->fcport = fcport;
1859         io_req->cmd_type = QEDF_TASK_MGMT_CMD;
1860
1861         /* Set the return CPU to be the same as the request one */
1862         io_req->cpu = smp_processor_id();
1863
1864         /* Set TM flags */
1865         io_req->io_req_flags = QEDF_READ;
1866         io_req->data_xfer_len = 0;
1867         io_req->tm_flags = tm_flags;
1868
1869         /* Default is to return a SCSI command when an error occurs */
1870         io_req->return_scsi_cmd_on_abts = true;
1871
1872         /* Obtain exchange id */
1873         xid = io_req->xid;
1874
1875         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "TMF io_req xid = "
1876                    "0x%x\n", xid);
1877
1878         /* Initialize task context for this IO request */
1879         task = qedf_get_task_mem(&qedf->tasks, xid);
1880
1881         init_completion(&io_req->tm_done);
1882
1883         spin_lock_irqsave(&fcport->rport_lock, flags);
1884
1885         sqe_idx = qedf_get_sqe_idx(fcport);
1886         sqe = &fcport->sq[sqe_idx];
1887         memset(sqe, 0, sizeof(struct fcoe_wqe));
1888
1889         qedf_init_task(fcport, lport, io_req, task, sqe);
1890         qedf_ring_doorbell(fcport);
1891
1892         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1893
1894         tmo = wait_for_completion_timeout(&io_req->tm_done,
1895             QEDF_TM_TIMEOUT * HZ);
1896
1897         if (!tmo) {
1898                 rc = FAILED;
1899                 QEDF_ERR(&(qedf->dbg_ctx), "wait for tm_cmpl timeout!\n");
1900         } else {
1901                 /* Check TMF response code */
1902                 if (io_req->fcp_rsp_code == 0)
1903                         rc = SUCCESS;
1904                 else
1905                         rc = FAILED;
1906         }
1907
1908         if (tm_flags == FCP_TMF_LUN_RESET)
1909                 qedf_flush_active_ios(fcport, (int)sc_cmd->device->lun);
1910         else
1911                 qedf_flush_active_ios(fcport, -1);
1912
1913         kref_put(&io_req->refcount, qedf_release_cmd);
1914
1915         if (rc != SUCCESS) {
1916                 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command failed...\n");
1917                 rc = FAILED;
1918         } else {
1919                 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command success...\n");
1920                 rc = SUCCESS;
1921         }
1922 reset_tmf_err:
1923         return rc;
1924 }
1925
1926 int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
1927 {
1928         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1929         struct fc_rport_libfc_priv *rp = rport->dd_data;
1930         struct qedf_rport *fcport = (struct qedf_rport *)&rp[1];
1931         struct qedf_ctx *qedf;
1932         struct fc_lport *lport;
1933         int rc = SUCCESS;
1934         int rval;
1935
1936         rval = fc_remote_port_chkready(rport);
1937
1938         if (rval) {
1939                 QEDF_ERR(NULL, "device_reset rport not ready\n");
1940                 rc = FAILED;
1941                 goto tmf_err;
1942         }
1943
1944         if (fcport == NULL) {
1945                 QEDF_ERR(NULL, "device_reset: rport is NULL\n");
1946                 rc = FAILED;
1947                 goto tmf_err;
1948         }
1949
1950         qedf = fcport->qedf;
1951         lport = qedf->lport;
1952
1953         if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
1954             test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
1955                 rc = SUCCESS;
1956                 goto tmf_err;
1957         }
1958
1959         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
1960                 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
1961                 rc = FAILED;
1962                 goto tmf_err;
1963         }
1964
1965         rc = qedf_execute_tmf(fcport, sc_cmd, tm_flags);
1966
1967 tmf_err:
1968         return rc;
1969 }
1970
1971 void qedf_process_tmf_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1972         struct qedf_ioreq *io_req)
1973 {
1974         struct fcoe_cqe_rsp_info *fcp_rsp;
1975
1976         fcp_rsp = &cqe->cqe_info.rsp_info;
1977         qedf_parse_fcp_rsp(io_req, fcp_rsp);
1978
1979         io_req->sc_cmd = NULL;
1980         complete(&io_req->tm_done);
1981 }
1982
1983 void qedf_process_unsol_compl(struct qedf_ctx *qedf, uint16_t que_idx,
1984         struct fcoe_cqe *cqe)
1985 {
1986         unsigned long flags;
1987         uint16_t tmp;
1988         uint16_t pktlen = cqe->cqe_info.unsolic_info.pkt_len;
1989         u32 payload_len, crc;
1990         struct fc_frame_header *fh;
1991         struct fc_frame *fp;
1992         struct qedf_io_work *io_work;
1993         u32 bdq_idx;
1994         void *bdq_addr;
1995
1996         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
1997             "address.hi=%x address.lo=%x opaque_data.hi=%x "
1998             "opaque_data.lo=%x bdq_prod_idx=%u len=%u.\n",
1999             le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.address.hi),
2000             le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.address.lo),
2001             le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.opaque.hi),
2002             le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.opaque.lo),
2003             qedf->bdq_prod_idx, pktlen);
2004
2005         bdq_idx = le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.opaque.lo);
2006         if (bdq_idx >= QEDF_BDQ_SIZE) {
2007                 QEDF_ERR(&(qedf->dbg_ctx), "bdq_idx is out of range %d.\n",
2008                     bdq_idx);
2009                 goto increment_prod;
2010         }
2011
2012         bdq_addr = qedf->bdq[bdq_idx].buf_addr;
2013         if (!bdq_addr) {
2014                 QEDF_ERR(&(qedf->dbg_ctx), "bdq_addr is NULL, dropping "
2015                     "unsolicited packet.\n");
2016                 goto increment_prod;
2017         }
2018
2019         if (qedf_dump_frames) {
2020                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2021                     "BDQ frame is at addr=%p.\n", bdq_addr);
2022                 print_hex_dump(KERN_WARNING, "bdq ", DUMP_PREFIX_OFFSET, 16, 1,
2023                     (void *)bdq_addr, pktlen, false);
2024         }
2025
2026         /* Allocate frame */
2027         payload_len = pktlen - sizeof(struct fc_frame_header);
2028         fp = fc_frame_alloc(qedf->lport, payload_len);
2029         if (!fp) {
2030                 QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate fp.\n");
2031                 goto increment_prod;
2032         }
2033
2034         /* Copy data from BDQ buffer into fc_frame struct */
2035         fh = (struct fc_frame_header *)fc_frame_header_get(fp);
2036         memcpy(fh, (void *)bdq_addr, pktlen);
2037
2038         /* Initialize the frame so libfc sees it as a valid frame */
2039         crc = fcoe_fc_crc(fp);
2040         fc_frame_init(fp);
2041         fr_dev(fp) = qedf->lport;
2042         fr_sof(fp) = FC_SOF_I3;
2043         fr_eof(fp) = FC_EOF_T;
2044         fr_crc(fp) = cpu_to_le32(~crc);
2045
2046         /*
2047          * We need to return the frame back up to libfc in a non-atomic
2048          * context
2049          */
2050         io_work = mempool_alloc(qedf->io_mempool, GFP_ATOMIC);
2051         if (!io_work) {
2052                 QEDF_WARN(&(qedf->dbg_ctx), "Could not allocate "
2053                            "work for I/O completion.\n");
2054                 fc_frame_free(fp);
2055                 goto increment_prod;
2056         }
2057         memset(io_work, 0, sizeof(struct qedf_io_work));
2058
2059         INIT_WORK(&io_work->work, qedf_fp_io_handler);
2060
2061         /* Copy contents of CQE for deferred processing */
2062         memcpy(&io_work->cqe, cqe, sizeof(struct fcoe_cqe));
2063
2064         io_work->qedf = qedf;
2065         io_work->fp = fp;
2066
2067         queue_work_on(smp_processor_id(), qedf_io_wq, &io_work->work);
2068 increment_prod:
2069         spin_lock_irqsave(&qedf->hba_lock, flags);
2070
2071         /* Increment producer to let f/w know we've handled the frame */
2072         qedf->bdq_prod_idx++;
2073
2074         /* Producer index wraps at uint16_t boundary */
2075         if (qedf->bdq_prod_idx == 0xffff)
2076                 qedf->bdq_prod_idx = 0;
2077
2078         writew(qedf->bdq_prod_idx, qedf->bdq_primary_prod);
2079         tmp = readw(qedf->bdq_primary_prod);
2080         writew(qedf->bdq_prod_idx, qedf->bdq_secondary_prod);
2081         tmp = readw(qedf->bdq_secondary_prod);
2082
2083         spin_unlock_irqrestore(&qedf->hba_lock, flags);
2084 }