drivers/scsi/qedf/qedf_io.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  QLogic FCoE Offload Driver
   4  *  Copyright (c) 2016-2018 Cavium Inc.
   5  */
   6 #include <linux/spinlock.h>
   7 #include <linux/vmalloc.h>
   8 #include "qedf.h"
   9 #include <scsi/scsi_tcq.h>
  10
  11 void qedf_cmd_timer_set(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
  12         unsigned int timer_msec)
  13 {
  14         queue_delayed_work(qedf->timer_work_queue, &io_req->timeout_work,
  15             msecs_to_jiffies(timer_msec));
  16 }
  17
  18 static void qedf_cmd_timeout(struct work_struct *work)
  19 {
  20
  21         struct qedf_ioreq *io_req =
  22             container_of(work, struct qedf_ioreq, timeout_work.work);
  23         struct qedf_ctx *qedf;
  24         struct qedf_rport *fcport;
  25
  26         fcport = io_req->fcport;
  27         if (io_req->fcport == NULL) {
  28                 QEDF_INFO(NULL, QEDF_LOG_IO,  "fcport is NULL.\n");
  29                 return;
  30         }
  31
  32         qedf = fcport->qedf;
  33
  34         switch (io_req->cmd_type) {
  35         case QEDF_ABTS:
  36                 if (qedf == NULL) {
  37                         QEDF_INFO(NULL, QEDF_LOG_IO,
  38                                   "qedf is NULL for ABTS xid=0x%x.\n",
  39                                   io_req->xid);
  40                         return;
  41                 }
  42
  43                 QEDF_ERR((&qedf->dbg_ctx), "ABTS timeout, xid=0x%x.\n",
  44                     io_req->xid);
  45                 /* Cleanup timed out ABTS */
  46                 qedf_initiate_cleanup(io_req, true);
  47                 complete(&io_req->abts_done);
  48
  49                 /*
  50                  * Need to call kref_put for reference taken when initiate_abts
  51                  * was called since abts_compl won't be called now that we've
  52                  * cleaned up the task.
  53                  */
  54                 kref_put(&io_req->refcount, qedf_release_cmd);
  55
  56                 /* Clear in abort bit now that we're done with the command */
  57                 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
  58
  59                 /*
  60                  * Now that the original I/O and the ABTS are complete see
  61                  * if we need to reconnect to the target.
  62                  */
  63                 qedf_restart_rport(fcport);
  64                 break;
  65         case QEDF_ELS:
  66                 if (!qedf) {
  67                         QEDF_INFO(NULL, QEDF_LOG_IO,
  68                                   "qedf is NULL for ELS xid=0x%x.\n",
  69                                   io_req->xid);
  70                         return;
  71                 }
  72                 /* ELS request no longer outstanding since it timed out */
  73                 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
  74
  75                 kref_get(&io_req->refcount);
  76                 /*
  77                  * Don't attempt to clean an ELS timeout as any subseqeunt
  78                  * ABTS or cleanup requests just hang.  For now just free
  79                  * the resources of the original I/O and the RRQ
  80                  */
  81                 QEDF_ERR(&(qedf->dbg_ctx), "ELS timeout, xid=0x%x.\n",
  82                           io_req->xid);
  83                 qedf_initiate_cleanup(io_req, true);
  84                 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
  85                 /* Call callback function to complete command */
  86                 if (io_req->cb_func && io_req->cb_arg) {
  87                         io_req->cb_func(io_req->cb_arg);
  88                         io_req->cb_arg = NULL;
  89                 }
  90                 kref_put(&io_req->refcount, qedf_release_cmd);
  91                 break;
  92         case QEDF_SEQ_CLEANUP:
  93                 QEDF_ERR(&(qedf->dbg_ctx), "Sequence cleanup timeout, "
  94                     "xid=0x%x.\n", io_req->xid);
  95                 qedf_initiate_cleanup(io_req, true);
  96                 io_req->event = QEDF_IOREQ_EV_ELS_TMO;
  97                 qedf_process_seq_cleanup_compl(qedf, NULL, io_req);
  98                 break;
  99         default:
 100                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
 101                           "Hit default case, xid=0x%x.\n", io_req->xid);
 102                 break;
 103         }
 104 }
 105
 106 void qedf_cmd_mgr_free(struct qedf_cmd_mgr *cmgr)
 107 {
 108         struct io_bdt *bdt_info;
 109         struct qedf_ctx *qedf = cmgr->qedf;
 110         size_t bd_tbl_sz;
 111         u16 min_xid = 0;
 112         u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
 113         int num_ios;
 114         int i;
 115         struct qedf_ioreq *io_req;
 116
 117         num_ios = max_xid - min_xid + 1;
 118
 119         /* Free fcoe_bdt_ctx structures */
 120         if (!cmgr->io_bdt_pool) {
 121                 QEDF_ERR(&qedf->dbg_ctx, "io_bdt_pool is NULL.\n");
 122                 goto free_cmd_pool;
 123         }
 124
 125         bd_tbl_sz = QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge);
 126         for (i = 0; i < num_ios; i++) {
 127                 bdt_info = cmgr->io_bdt_pool[i];
 128                 if (bdt_info->bd_tbl) {
 129                         dma_free_coherent(&qedf->pdev->dev, bd_tbl_sz,
 130                             bdt_info->bd_tbl, bdt_info->bd_tbl_dma);
 131                         bdt_info->bd_tbl = NULL;
 132                 }
 133         }
 134
 135         /* Destroy io_bdt pool */
 136         for (i = 0; i < num_ios; i++) {
 137                 kfree(cmgr->io_bdt_pool[i]);
 138                 cmgr->io_bdt_pool[i] = NULL;
 139         }
 140
 141         kfree(cmgr->io_bdt_pool);
 142         cmgr->io_bdt_pool = NULL;
 143
 144 free_cmd_pool:
 145
 146         for (i = 0; i < num_ios; i++) {
 147                 io_req = &cmgr->cmds[i];
 148                 kfree(io_req->sgl_task_params);
 149                 kfree(io_req->task_params);
 150                 /* Make sure we free per command sense buffer */
 151                 if (io_req->sense_buffer)
 152                         dma_free_coherent(&qedf->pdev->dev,
 153                             QEDF_SCSI_SENSE_BUFFERSIZE, io_req->sense_buffer,
 154                             io_req->sense_buffer_dma);
 155                 cancel_delayed_work_sync(&io_req->rrq_work);
 156         }
 157
 158         /* Free command manager itself */
 159         vfree(cmgr);
 160 }
 161
 162 static void qedf_handle_rrq(struct work_struct *work)
 163 {
 164         struct qedf_ioreq *io_req =
 165             container_of(work, struct qedf_ioreq, rrq_work.work);
 166
 167         atomic_set(&io_req->state, QEDFC_CMD_ST_RRQ_ACTIVE);
 168         qedf_send_rrq(io_req);
 169
 170 }
 171
 172 struct qedf_cmd_mgr *qedf_cmd_mgr_alloc(struct qedf_ctx *qedf)
 173 {
 174         struct qedf_cmd_mgr *cmgr;
 175         struct io_bdt *bdt_info;
 176         struct qedf_ioreq *io_req;
 177         u16 xid;
 178         int i;
 179         int num_ios;
 180         u16 min_xid = 0;
 181         u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
 182
 183         /* Make sure num_queues is already set before calling this function */
 184         if (!qedf->num_queues) {
 185                 QEDF_ERR(&(qedf->dbg_ctx), "num_queues is not set.\n");
 186                 return NULL;
 187         }
 188
 189         if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
 190                 QEDF_WARN(&(qedf->dbg_ctx), "Invalid min_xid 0x%x and "
 191                            "max_xid 0x%x.\n", min_xid, max_xid);
 192                 return NULL;
 193         }
 194
 195         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "min xid 0x%x, max xid "
 196                    "0x%x.\n", min_xid, max_xid);
 197
 198         num_ios = max_xid - min_xid + 1;
 199
 200         cmgr = vzalloc(sizeof(struct qedf_cmd_mgr));
 201         if (!cmgr) {
 202                 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc cmd mgr.\n");
 203                 return NULL;
 204         }
 205
 206         cmgr->qedf = qedf;
 207         spin_lock_init(&cmgr->lock);
 208
 209         /*
 210          * Initialize I/O request fields.
 211          */
 212         xid = 0;
 213
 214         for (i = 0; i < num_ios; i++) {
 215                 io_req = &cmgr->cmds[i];
 216                 INIT_DELAYED_WORK(&io_req->timeout_work, qedf_cmd_timeout);
 217
 218                 io_req->xid = xid++;
 219
 220                 INIT_DELAYED_WORK(&io_req->rrq_work, qedf_handle_rrq);
 221
 222                 /* Allocate DMA memory to hold sense buffer */
 223                 io_req->sense_buffer = dma_alloc_coherent(&qedf->pdev->dev,
 224                     QEDF_SCSI_SENSE_BUFFERSIZE, &io_req->sense_buffer_dma,
 225                     GFP_KERNEL);
 226                 if (!io_req->sense_buffer) {
 227                         QEDF_ERR(&qedf->dbg_ctx,
 228                                  "Failed to alloc sense buffer.\n");
 229                         goto mem_err;
 230                 }
 231
 232                 /* Allocate task parameters to pass to f/w init funcions */
 233                 io_req->task_params = kzalloc(sizeof(*io_req->task_params),
 234                                               GFP_KERNEL);
 235                 if (!io_req->task_params) {
 236                         QEDF_ERR(&(qedf->dbg_ctx),
 237                                  "Failed to allocate task_params for xid=0x%x\n",
 238                                  i);
 239                         goto mem_err;
 240                 }
 241
 242                 /*
 243                  * Allocate scatter/gather list info to pass to f/w init
 244                  * functions.
 245                  */
 246                 io_req->sgl_task_params = kzalloc(
 247                     sizeof(struct scsi_sgl_task_params), GFP_KERNEL);
 248                 if (!io_req->sgl_task_params) {
 249                         QEDF_ERR(&(qedf->dbg_ctx),
 250                                  "Failed to allocate sgl_task_params for xid=0x%x\n",
 251                                  i);
 252                         goto mem_err;
 253                 }
 254         }
 255
 256         /* Allocate pool of io_bdts - one for each qedf_ioreq */
 257         cmgr->io_bdt_pool = kmalloc_array(num_ios, sizeof(struct io_bdt *),
 258             GFP_KERNEL);
 259
 260         if (!cmgr->io_bdt_pool) {
 261                 QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc io_bdt_pool.\n");
 262                 goto mem_err;
 263         }
 264
 265         for (i = 0; i < num_ios; i++) {
 266                 cmgr->io_bdt_pool[i] = kmalloc(sizeof(struct io_bdt),
 267                     GFP_KERNEL);
 268                 if (!cmgr->io_bdt_pool[i]) {
 269                         QEDF_WARN(&(qedf->dbg_ctx),
 270                                   "Failed to alloc io_bdt_pool[%d].\n", i);
 271                         goto mem_err;
 272                 }
 273         }
 274
 275         for (i = 0; i < num_ios; i++) {
 276                 bdt_info = cmgr->io_bdt_pool[i];
 277                 bdt_info->bd_tbl = dma_alloc_coherent(&qedf->pdev->dev,
 278                     QEDF_MAX_BDS_PER_CMD * sizeof(struct scsi_sge),
 279                     &bdt_info->bd_tbl_dma, GFP_KERNEL);
 280                 if (!bdt_info->bd_tbl) {
 281                         QEDF_WARN(&(qedf->dbg_ctx),
 282                                   "Failed to alloc bdt_tbl[%d].\n", i);
 283                         goto mem_err;
 284                 }
 285         }
 286         atomic_set(&cmgr->free_list_cnt, num_ios);
 287         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 288             "cmgr->free_list_cnt=%d.\n",
 289             atomic_read(&cmgr->free_list_cnt));
 290
 291         return cmgr;
 292
 293 mem_err:
 294         qedf_cmd_mgr_free(cmgr);
 295         return NULL;
 296 }
 297
 298 struct qedf_ioreq *qedf_alloc_cmd(struct qedf_rport *fcport, u8 cmd_type)
 299 {
 300         struct qedf_ctx *qedf = fcport->qedf;
 301         struct qedf_cmd_mgr *cmd_mgr = qedf->cmd_mgr;
 302         struct qedf_ioreq *io_req = NULL;
 303         struct io_bdt *bd_tbl;
 304         u16 xid;
 305         uint32_t free_sqes;
 306         int i;
 307         unsigned long flags;
 308
 309         free_sqes = atomic_read(&fcport->free_sqes);
 310
 311         if (!free_sqes) {
 312                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 313                     "Returning NULL, free_sqes=%d.\n ",
 314                     free_sqes);
 315                 goto out_failed;
 316         }
 317
 318         /* Limit the number of outstanding R/W tasks */
 319         if ((atomic_read(&fcport->num_active_ios) >=
 320             NUM_RW_TASKS_PER_CONNECTION)) {
 321                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 322                     "Returning NULL, num_active_ios=%d.\n",
 323                     atomic_read(&fcport->num_active_ios));
 324                 goto out_failed;
 325         }
 326
 327         /* Limit global TIDs certain tasks */
 328         if (atomic_read(&cmd_mgr->free_list_cnt) <= GBL_RSVD_TASKS) {
 329                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 330                     "Returning NULL, free_list_cnt=%d.\n",
 331                     atomic_read(&cmd_mgr->free_list_cnt));
 332                 goto out_failed;
 333         }
 334
 335         spin_lock_irqsave(&cmd_mgr->lock, flags);
 336         for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
 337                 io_req = &cmd_mgr->cmds[cmd_mgr->idx];
 338                 cmd_mgr->idx++;
 339                 if (cmd_mgr->idx == FCOE_PARAMS_NUM_TASKS)
 340                         cmd_mgr->idx = 0;
 341
 342                 /* Check to make sure command was previously freed */
 343                 if (!io_req->alloc)
 344                         break;
 345         }
 346
 347         if (i == FCOE_PARAMS_NUM_TASKS) {
 348                 spin_unlock_irqrestore(&cmd_mgr->lock, flags);
 349                 goto out_failed;
 350         }
 351
 352         if (test_bit(QEDF_CMD_DIRTY, &io_req->flags))
 353                 QEDF_ERR(&qedf->dbg_ctx,
 354                          "io_req found to be dirty ox_id = 0x%x.\n",
 355                          io_req->xid);
 356
 357         /* Clear any flags now that we've reallocated the xid */
 358         io_req->flags = 0;
 359         io_req->alloc = 1;
 360         spin_unlock_irqrestore(&cmd_mgr->lock, flags);
 361
 362         atomic_inc(&fcport->num_active_ios);
 363         atomic_dec(&fcport->free_sqes);
 364         xid = io_req->xid;
 365         atomic_dec(&cmd_mgr->free_list_cnt);
 366
 367         io_req->cmd_mgr = cmd_mgr;
 368         io_req->fcport = fcport;
 369
 370         /* Clear any stale sc_cmd back pointer */
 371         io_req->sc_cmd = NULL;
 372         io_req->lun = -1;
 373
 374         /* Hold the io_req against deletion */
 375         kref_init(&io_req->refcount);   /* ID: 001 */
 376         atomic_set(&io_req->state, QEDFC_CMD_ST_IO_ACTIVE);
 377
 378         /* Bind io_bdt for this io_req */
 379         /* Have a static link between io_req and io_bdt_pool */
 380         bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
 381         if (bd_tbl == NULL) {
 382                 QEDF_ERR(&(qedf->dbg_ctx), "bd_tbl is NULL, xid=%x.\n", xid);
 383                 kref_put(&io_req->refcount, qedf_release_cmd);
 384                 goto out_failed;
 385         }
 386         bd_tbl->io_req = io_req;
 387         io_req->cmd_type = cmd_type;
 388         io_req->tm_flags = 0;
 389
 390         /* Reset sequence offset data */
 391         io_req->rx_buf_off = 0;
 392         io_req->tx_buf_off = 0;
 393         io_req->rx_id = 0xffff; /* No OX_ID */
 394
 395         return io_req;
 396
 397 out_failed:
 398         /* Record failure for stats and return NULL to caller */
 399         qedf->alloc_failures++;
 400         return NULL;
 401 }
 402
 403 static void qedf_free_mp_resc(struct qedf_ioreq *io_req)
 404 {
 405         struct qedf_mp_req *mp_req = &(io_req->mp_req);
 406         struct qedf_ctx *qedf = io_req->fcport->qedf;
 407         uint64_t sz = sizeof(struct scsi_sge);
 408
 409         /* clear tm flags */
 410         if (mp_req->mp_req_bd) {
 411                 dma_free_coherent(&qedf->pdev->dev, sz,
 412                     mp_req->mp_req_bd, mp_req->mp_req_bd_dma);
 413                 mp_req->mp_req_bd = NULL;
 414         }
 415         if (mp_req->mp_resp_bd) {
 416                 dma_free_coherent(&qedf->pdev->dev, sz,
 417                     mp_req->mp_resp_bd, mp_req->mp_resp_bd_dma);
 418                 mp_req->mp_resp_bd = NULL;
 419         }
 420         if (mp_req->req_buf) {
 421                 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
 422                     mp_req->req_buf, mp_req->req_buf_dma);
 423                 mp_req->req_buf = NULL;
 424         }
 425         if (mp_req->resp_buf) {
 426                 dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
 427                     mp_req->resp_buf, mp_req->resp_buf_dma);
 428                 mp_req->resp_buf = NULL;
 429         }
 430 }
 431
 432 void qedf_release_cmd(struct kref *ref)
 433 {
 434         struct qedf_ioreq *io_req =
 435             container_of(ref, struct qedf_ioreq, refcount);
 436         struct qedf_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
 437         struct qedf_rport *fcport = io_req->fcport;
 438         unsigned long flags;
 439
 440         if (io_req->cmd_type == QEDF_SCSI_CMD) {
 441                 QEDF_WARN(&fcport->qedf->dbg_ctx,
 442                           "Cmd released called without scsi_done called, io_req %p xid=0x%x.\n",
 443                           io_req, io_req->xid);
 444                 WARN_ON(io_req->sc_cmd);
 445         }
 446
 447         if (io_req->cmd_type == QEDF_ELS ||
 448             io_req->cmd_type == QEDF_TASK_MGMT_CMD)
 449                 qedf_free_mp_resc(io_req);
 450
 451         atomic_inc(&cmd_mgr->free_list_cnt);
 452         atomic_dec(&fcport->num_active_ios);
 453         atomic_set(&io_req->state, QEDF_CMD_ST_INACTIVE);
 454         if (atomic_read(&fcport->num_active_ios) < 0) {
 455                 QEDF_WARN(&(fcport->qedf->dbg_ctx), "active_ios < 0.\n");
 456                 WARN_ON(1);
 457         }
 458
 459         /* Increment task retry identifier now that the request is released */
 460         io_req->task_retry_identifier++;
 461         io_req->fcport = NULL;
 462
 463         clear_bit(QEDF_CMD_DIRTY, &io_req->flags);
 464         io_req->cpu = 0;
 465         spin_lock_irqsave(&cmd_mgr->lock, flags);
 466         io_req->fcport = NULL;
 467         io_req->alloc = 0;
 468         spin_unlock_irqrestore(&cmd_mgr->lock, flags);
 469 }
 470
 471 static int qedf_map_sg(struct qedf_ioreq *io_req)
 472 {
 473         struct scsi_cmnd *sc = io_req->sc_cmd;
 474         struct Scsi_Host *host = sc->device->host;
 475         struct fc_lport *lport = shost_priv(host);
 476         struct qedf_ctx *qedf = lport_priv(lport);
 477         struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
 478         struct scatterlist *sg;
 479         int byte_count = 0;
 480         int sg_count = 0;
 481         int bd_count = 0;
 482         u32 sg_len;
 483         u64 addr;
 484         int i = 0;
 485
 486         sg_count = dma_map_sg(&qedf->pdev->dev, scsi_sglist(sc),
 487             scsi_sg_count(sc), sc->sc_data_direction);
 488         sg = scsi_sglist(sc);
 489
 490         io_req->sge_type = QEDF_IOREQ_UNKNOWN_SGE;
 491
 492         if (sg_count <= 8 || io_req->io_req_flags == QEDF_READ)
 493                 io_req->sge_type = QEDF_IOREQ_FAST_SGE;
 494
 495         scsi_for_each_sg(sc, sg, sg_count, i) {
 496                 sg_len = (u32)sg_dma_len(sg);
 497                 addr = (u64)sg_dma_address(sg);
 498
 499                 /*
 500                  * Intermediate s/g element so check if start address
 501                  * is page aligned.  Only required for writes and only if the
 502                  * number of scatter/gather elements is 8 or more.
 503                  */
 504                 if (io_req->sge_type == QEDF_IOREQ_UNKNOWN_SGE && (i) &&
 505                     (i != (sg_count - 1)) && sg_len < QEDF_PAGE_SIZE)
 506                         io_req->sge_type = QEDF_IOREQ_SLOW_SGE;
 507
 508                 bd[bd_count].sge_addr.lo = cpu_to_le32(U64_LO(addr));
 509                 bd[bd_count].sge_addr.hi  = cpu_to_le32(U64_HI(addr));
 510                 bd[bd_count].sge_len = cpu_to_le32(sg_len);
 511
 512                 bd_count++;
 513                 byte_count += sg_len;
 514         }
 515
 516         /* To catch a case where FAST and SLOW nothing is set, set FAST */
 517         if (io_req->sge_type == QEDF_IOREQ_UNKNOWN_SGE)
 518                 io_req->sge_type = QEDF_IOREQ_FAST_SGE;
 519
 520         if (byte_count != scsi_bufflen(sc))
 521                 QEDF_ERR(&(qedf->dbg_ctx), "byte_count = %d != "
 522                           "scsi_bufflen = %d, task_id = 0x%x.\n", byte_count,
 523                            scsi_bufflen(sc), io_req->xid);
 524
 525         return bd_count;
 526 }
 527
 528 static int qedf_build_bd_list_from_sg(struct qedf_ioreq *io_req)
 529 {
 530         struct scsi_cmnd *sc = io_req->sc_cmd;
 531         struct scsi_sge *bd = io_req->bd_tbl->bd_tbl;
 532         int bd_count;
 533
 534         if (scsi_sg_count(sc)) {
 535                 bd_count = qedf_map_sg(io_req);
 536                 if (bd_count == 0)
 537                         return -ENOMEM;
 538         } else {
 539                 bd_count = 0;
 540                 bd[0].sge_addr.lo = bd[0].sge_addr.hi = 0;
 541                 bd[0].sge_len = 0;
 542         }
 543         io_req->bd_tbl->bd_valid = bd_count;
 544
 545         return 0;
 546 }
 547
 548 static void qedf_build_fcp_cmnd(struct qedf_ioreq *io_req,
 549                                   struct fcp_cmnd *fcp_cmnd)
 550 {
 551         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 552
 553         /* fcp_cmnd is 32 bytes */
 554         memset(fcp_cmnd, 0, FCP_CMND_LEN);
 555
 556         /* 8 bytes: SCSI LUN info */
 557         int_to_scsilun(sc_cmd->device->lun,
 558                         (struct scsi_lun *)&fcp_cmnd->fc_lun);
 559
 560         /* 4 bytes: flag info */
 561         fcp_cmnd->fc_pri_ta = 0;
 562         fcp_cmnd->fc_tm_flags = io_req->tm_flags;
 563         fcp_cmnd->fc_flags = io_req->io_req_flags;
 564         fcp_cmnd->fc_cmdref = 0;
 565
 566         /* Populate data direction */
 567         if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
 568                 fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
 569         } else {
 570                 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE)
 571                         fcp_cmnd->fc_flags |= FCP_CFL_WRDATA;
 572                 else if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE)
 573                         fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
 574         }
 575
 576         fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
 577
 578         /* 16 bytes: CDB information */
 579         if (io_req->cmd_type != QEDF_TASK_MGMT_CMD)
 580                 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
 581
 582         /* 4 bytes: FCP data length */
 583         fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
 584 }
 585
 586 static void  qedf_init_task(struct qedf_rport *fcport, struct fc_lport *lport,
 587         struct qedf_ioreq *io_req, struct fcoe_task_context *task_ctx,
 588         struct fcoe_wqe *sqe)
 589 {
 590         enum fcoe_task_type task_type;
 591         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 592         struct io_bdt *bd_tbl = io_req->bd_tbl;
 593         u8 fcp_cmnd[32];
 594         u32 tmp_fcp_cmnd[8];
 595         int bd_count = 0;
 596         struct qedf_ctx *qedf = fcport->qedf;
 597         uint16_t cq_idx = smp_processor_id() % qedf->num_queues;
 598         struct regpair sense_data_buffer_phys_addr;
 599         u32 tx_io_size = 0;
 600         u32 rx_io_size = 0;
 601         int i, cnt;
 602
 603         /* Note init_initiator_rw_fcoe_task memsets the task context */
 604         io_req->task = task_ctx;
 605         memset(task_ctx, 0, sizeof(struct fcoe_task_context));
 606         memset(io_req->task_params, 0, sizeof(struct fcoe_task_params));
 607         memset(io_req->sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
 608
 609         /* Set task type bassed on DMA directio of command */
 610         if (io_req->cmd_type == QEDF_TASK_MGMT_CMD) {
 611                 task_type = FCOE_TASK_TYPE_READ_INITIATOR;
 612         } else {
 613                 if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
 614                         task_type = FCOE_TASK_TYPE_WRITE_INITIATOR;
 615                         tx_io_size = io_req->data_xfer_len;
 616                 } else {
 617                         task_type = FCOE_TASK_TYPE_READ_INITIATOR;
 618                         rx_io_size = io_req->data_xfer_len;
 619                 }
 620         }
 621
 622         /* Setup the fields for fcoe_task_params */
 623         io_req->task_params->context = task_ctx;
 624         io_req->task_params->sqe = sqe;
 625         io_req->task_params->task_type = task_type;
 626         io_req->task_params->tx_io_size = tx_io_size;
 627         io_req->task_params->rx_io_size = rx_io_size;
 628         io_req->task_params->conn_cid = fcport->fw_cid;
 629         io_req->task_params->itid = io_req->xid;
 630         io_req->task_params->cq_rss_number = cq_idx;
 631         io_req->task_params->is_tape_device = fcport->dev_type;
 632
 633         /* Fill in information for scatter/gather list */
 634         if (io_req->cmd_type != QEDF_TASK_MGMT_CMD) {
 635                 bd_count = bd_tbl->bd_valid;
 636                 io_req->sgl_task_params->sgl = bd_tbl->bd_tbl;
 637                 io_req->sgl_task_params->sgl_phys_addr.lo =
 638                         U64_LO(bd_tbl->bd_tbl_dma);
 639                 io_req->sgl_task_params->sgl_phys_addr.hi =
 640                         U64_HI(bd_tbl->bd_tbl_dma);
 641                 io_req->sgl_task_params->num_sges = bd_count;
 642                 io_req->sgl_task_params->total_buffer_size =
 643                     scsi_bufflen(io_req->sc_cmd);
 644                 if (io_req->sge_type == QEDF_IOREQ_SLOW_SGE)
 645                         io_req->sgl_task_params->small_mid_sge = 1;
 646                 else
 647                         io_req->sgl_task_params->small_mid_sge = 0;
 648         }
 649
 650         /* Fill in physical address of sense buffer */
 651         sense_data_buffer_phys_addr.lo = U64_LO(io_req->sense_buffer_dma);
 652         sense_data_buffer_phys_addr.hi = U64_HI(io_req->sense_buffer_dma);
 653
 654         /* fill FCP_CMND IU */
 655         qedf_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tmp_fcp_cmnd);
 656
 657         /* Swap fcp_cmnd since FC is big endian */
 658         cnt = sizeof(struct fcp_cmnd) / sizeof(u32);
 659         for (i = 0; i < cnt; i++) {
 660                 tmp_fcp_cmnd[i] = cpu_to_be32(tmp_fcp_cmnd[i]);
 661         }
 662         memcpy(fcp_cmnd, tmp_fcp_cmnd, sizeof(struct fcp_cmnd));
 663
 664         init_initiator_rw_fcoe_task(io_req->task_params,
 665                                     io_req->sgl_task_params,
 666                                     sense_data_buffer_phys_addr,
 667                                     io_req->task_retry_identifier, fcp_cmnd);
 668
 669         /* Increment SGL type counters */
 670         if (io_req->sge_type == QEDF_IOREQ_SLOW_SGE)
 671                 qedf->slow_sge_ios++;
 672         else
 673                 qedf->fast_sge_ios++;
 674 }
 675
 676 void qedf_init_mp_task(struct qedf_ioreq *io_req,
 677         struct fcoe_task_context *task_ctx, struct fcoe_wqe *sqe)
 678 {
 679         struct qedf_mp_req *mp_req = &(io_req->mp_req);
 680         struct qedf_rport *fcport = io_req->fcport;
 681         struct qedf_ctx *qedf = io_req->fcport->qedf;
 682         struct fc_frame_header *fc_hdr;
 683         struct fcoe_tx_mid_path_params task_fc_hdr;
 684         struct scsi_sgl_task_params tx_sgl_task_params;
 685         struct scsi_sgl_task_params rx_sgl_task_params;
 686
 687         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC,
 688                   "Initializing MP task for cmd_type=%d\n",
 689                   io_req->cmd_type);
 690
 691         qedf->control_requests++;
 692
 693         memset(&tx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
 694         memset(&rx_sgl_task_params, 0, sizeof(struct scsi_sgl_task_params));
 695         memset(task_ctx, 0, sizeof(struct fcoe_task_context));
 696         memset(&task_fc_hdr, 0, sizeof(struct fcoe_tx_mid_path_params));
 697
 698         /* Setup the task from io_req for easy reference */
 699         io_req->task = task_ctx;
 700
 701         /* Setup the fields for fcoe_task_params */
 702         io_req->task_params->context = task_ctx;
 703         io_req->task_params->sqe = sqe;
 704         io_req->task_params->task_type = FCOE_TASK_TYPE_MIDPATH;
 705         io_req->task_params->tx_io_size = io_req->data_xfer_len;
 706         /* rx_io_size tells the f/w how large a response buffer we have */
 707         io_req->task_params->rx_io_size = PAGE_SIZE;
 708         io_req->task_params->conn_cid = fcport->fw_cid;
 709         io_req->task_params->itid = io_req->xid;
 710         /* Return middle path commands on CQ 0 */
 711         io_req->task_params->cq_rss_number = 0;
 712         io_req->task_params->is_tape_device = fcport->dev_type;
 713
 714         fc_hdr = &(mp_req->req_fc_hdr);
 715         /* Set OX_ID and RX_ID based on driver task id */
 716         fc_hdr->fh_ox_id = io_req->xid;
 717         fc_hdr->fh_rx_id = htons(0xffff);
 718
 719         /* Set up FC header information */
 720         task_fc_hdr.parameter = fc_hdr->fh_parm_offset;
 721         task_fc_hdr.r_ctl = fc_hdr->fh_r_ctl;
 722         task_fc_hdr.type = fc_hdr->fh_type;
 723         task_fc_hdr.cs_ctl = fc_hdr->fh_cs_ctl;
 724         task_fc_hdr.df_ctl = fc_hdr->fh_df_ctl;
 725         task_fc_hdr.rx_id = fc_hdr->fh_rx_id;
 726         task_fc_hdr.ox_id = fc_hdr->fh_ox_id;
 727
 728         /* Set up s/g list parameters for request buffer */
 729         tx_sgl_task_params.sgl = mp_req->mp_req_bd;
 730         tx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_req_bd_dma);
 731         tx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_req_bd_dma);
 732         tx_sgl_task_params.num_sges = 1;
 733         /* Set PAGE_SIZE for now since sg element is that size ??? */
 734         tx_sgl_task_params.total_buffer_size = io_req->data_xfer_len;
 735         tx_sgl_task_params.small_mid_sge = 0;
 736
 737         /* Set up s/g list parameters for request buffer */
 738         rx_sgl_task_params.sgl = mp_req->mp_resp_bd;
 739         rx_sgl_task_params.sgl_phys_addr.lo = U64_LO(mp_req->mp_resp_bd_dma);
 740         rx_sgl_task_params.sgl_phys_addr.hi = U64_HI(mp_req->mp_resp_bd_dma);
 741         rx_sgl_task_params.num_sges = 1;
 742         /* Set PAGE_SIZE for now since sg element is that size ??? */
 743         rx_sgl_task_params.total_buffer_size = PAGE_SIZE;
 744         rx_sgl_task_params.small_mid_sge = 0;
 745
 746
 747         /*
 748          * Last arg is 0 as previous code did not set that we wanted the
 749          * fc header information.
 750          */
 751         init_initiator_midpath_unsolicited_fcoe_task(io_req->task_params,
 752                                                      &task_fc_hdr,
 753                                                      &tx_sgl_task_params,
 754                                                      &rx_sgl_task_params, 0);
 755 }
 756
 757 /* Presumed that fcport->rport_lock is held */
 758 u16 qedf_get_sqe_idx(struct qedf_rport *fcport)
 759 {
 760         uint16_t total_sqe = (fcport->sq_mem_size)/(sizeof(struct fcoe_wqe));
 761         u16 rval;
 762
 763         rval = fcport->sq_prod_idx;
 764
 765         /* Adjust ring index */
 766         fcport->sq_prod_idx++;
 767         fcport->fw_sq_prod_idx++;
 768         if (fcport->sq_prod_idx == total_sqe)
 769                 fcport->sq_prod_idx = 0;
 770
 771         return rval;
 772 }
 773
 774 void qedf_ring_doorbell(struct qedf_rport *fcport)
 775 {
 776         struct fcoe_db_data dbell = { 0 };
 777
 778         dbell.agg_flags = 0;
 779
 780         dbell.params |= DB_DEST_XCM << FCOE_DB_DATA_DEST_SHIFT;
 781         dbell.params |= DB_AGG_CMD_SET << FCOE_DB_DATA_AGG_CMD_SHIFT;
 782         dbell.params |= DQ_XCM_FCOE_SQ_PROD_CMD <<
 783             FCOE_DB_DATA_AGG_VAL_SEL_SHIFT;
 784
 785         dbell.sq_prod = fcport->fw_sq_prod_idx;
 786         /* wmb makes sure that the BDs data is updated before updating the
 787          * producer, otherwise FW may read old data from the BDs.
 788          */
 789         wmb();
 790         barrier();
 791         writel(*(u32 *)&dbell, fcport->p_doorbell);
 792         /*
 793          * Fence required to flush the write combined buffer, since another
 794          * CPU may write to the same doorbell address and data may be lost
 795          * due to relaxed order nature of write combined bar.
 796          */
 797         wmb();
 798 }
 799
 800 static void qedf_trace_io(struct qedf_rport *fcport, struct qedf_ioreq *io_req,
 801                           int8_t direction)
 802 {
 803         struct qedf_ctx *qedf = fcport->qedf;
 804         struct qedf_io_log *io_log;
 805         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 806         unsigned long flags;
 807
 808         spin_lock_irqsave(&qedf->io_trace_lock, flags);
 809
 810         io_log = &qedf->io_trace_buf[qedf->io_trace_idx];
 811         io_log->direction = direction;
 812         io_log->task_id = io_req->xid;
 813         io_log->port_id = fcport->rdata->ids.port_id;
 814         io_log->lun = sc_cmd->device->lun;
 815         io_log->op = sc_cmd->cmnd[0];
 816         io_log->lba[0] = sc_cmd->cmnd[2];
 817         io_log->lba[1] = sc_cmd->cmnd[3];
 818         io_log->lba[2] = sc_cmd->cmnd[4];
 819         io_log->lba[3] = sc_cmd->cmnd[5];
 820         io_log->bufflen = scsi_bufflen(sc_cmd);
 821         io_log->sg_count = scsi_sg_count(sc_cmd);
 822         io_log->result = sc_cmd->result;
 823         io_log->jiffies = jiffies;
 824         io_log->refcount = kref_read(&io_req->refcount);
 825
 826         if (direction == QEDF_IO_TRACE_REQ) {
 827                 /* For requests we only care abot the submission CPU */
 828                 io_log->req_cpu = io_req->cpu;
 829                 io_log->int_cpu = 0;
 830                 io_log->rsp_cpu = 0;
 831         } else if (direction == QEDF_IO_TRACE_RSP) {
 832                 io_log->req_cpu = io_req->cpu;
 833                 io_log->int_cpu = io_req->int_cpu;
 834                 io_log->rsp_cpu = smp_processor_id();
 835         }
 836
 837         io_log->sge_type = io_req->sge_type;
 838
 839         qedf->io_trace_idx++;
 840         if (qedf->io_trace_idx == QEDF_IO_TRACE_SIZE)
 841                 qedf->io_trace_idx = 0;
 842
 843         spin_unlock_irqrestore(&qedf->io_trace_lock, flags);
 844 }
 845
 846 int qedf_post_io_req(struct qedf_rport *fcport, struct qedf_ioreq *io_req)
 847 {
 848         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 849         struct Scsi_Host *host = sc_cmd->device->host;
 850         struct fc_lport *lport = shost_priv(host);
 851         struct qedf_ctx *qedf = lport_priv(lport);
 852         struct fcoe_task_context *task_ctx;
 853         u16 xid;
 854         struct fcoe_wqe *sqe;
 855         u16 sqe_idx;
 856
 857         /* Initialize rest of io_req fileds */
 858         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
 859         qedf_priv(sc_cmd)->io_req = io_req;
 860         io_req->sge_type = QEDF_IOREQ_FAST_SGE; /* Assume fast SGL by default */
 861
 862         /* Record which cpu this request is associated with */
 863         io_req->cpu = smp_processor_id();
 864
 865         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
 866                 io_req->io_req_flags = QEDF_READ;
 867                 qedf->input_requests++;
 868         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
 869                 io_req->io_req_flags = QEDF_WRITE;
 870                 qedf->output_requests++;
 871         } else {
 872                 io_req->io_req_flags = 0;
 873                 qedf->control_requests++;
 874         }
 875
 876         xid = io_req->xid;
 877
 878         /* Build buffer descriptor list for firmware from sg list */
 879         if (qedf_build_bd_list_from_sg(io_req)) {
 880                 QEDF_ERR(&(qedf->dbg_ctx), "BD list creation failed.\n");
 881                 /* Release cmd will release io_req, but sc_cmd is assigned */
 882                 io_req->sc_cmd = NULL;
 883                 kref_put(&io_req->refcount, qedf_release_cmd);
 884                 return -EAGAIN;
 885         }
 886
 887         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
 888             test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
 889                 QEDF_ERR(&(qedf->dbg_ctx), "Session not offloaded yet.\n");
 890                 /* Release cmd will release io_req, but sc_cmd is assigned */
 891                 io_req->sc_cmd = NULL;
 892                 kref_put(&io_req->refcount, qedf_release_cmd);
 893                 return -EINVAL;
 894         }
 895
 896         /* Record LUN number for later use if we need them */
 897         io_req->lun = (int)sc_cmd->device->lun;
 898
 899         /* Obtain free SQE */
 900         sqe_idx = qedf_get_sqe_idx(fcport);
 901         sqe = &fcport->sq[sqe_idx];
 902         memset(sqe, 0, sizeof(struct fcoe_wqe));
 903
 904         /* Get the task context */
 905         task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
 906         if (!task_ctx) {
 907                 QEDF_WARN(&(qedf->dbg_ctx), "task_ctx is NULL, xid=%d.\n",
 908                            xid);
 909                 /* Release cmd will release io_req, but sc_cmd is assigned */
 910                 io_req->sc_cmd = NULL;
 911                 kref_put(&io_req->refcount, qedf_release_cmd);
 912                 return -EINVAL;
 913         }
 914
 915         qedf_init_task(fcport, lport, io_req, task_ctx, sqe);
 916
 917         /* Ring doorbell */
 918         qedf_ring_doorbell(fcport);
 919
 920         /* Set that command is with the firmware now */
 921         set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
 922
 923         if (qedf_io_tracing && io_req->sc_cmd)
 924                 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_REQ);
 925
 926         return false;
 927 }
 928
 929 int
 930 qedf_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc_cmd)
 931 {
 932         struct fc_lport *lport = shost_priv(host);
 933         struct qedf_ctx *qedf = lport_priv(lport);
 934         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
 935         struct fc_rport_libfc_priv *rp = rport->dd_data;
 936         struct qedf_rport *fcport;
 937         struct qedf_ioreq *io_req;
 938         int rc = 0;
 939         int rval;
 940         unsigned long flags = 0;
 941         int num_sgs = 0;
 942
 943         num_sgs = scsi_sg_count(sc_cmd);
 944         if (scsi_sg_count(sc_cmd) > QEDF_MAX_BDS_PER_CMD) {
 945                 QEDF_ERR(&qedf->dbg_ctx,
 946                          "Number of SG elements %d exceeds what hardware limitation of %d.\n",
 947                          num_sgs, QEDF_MAX_BDS_PER_CMD);
 948                 sc_cmd->result = DID_ERROR;
 949                 scsi_done(sc_cmd);
 950                 return 0;
 951         }
 952
 953         if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
 954             test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
 955                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
 956                           "Returning DNC as unloading or stop io, flags 0x%lx.\n",
 957                           qedf->flags);
 958                 sc_cmd->result = DID_NO_CONNECT << 16;
 959                 scsi_done(sc_cmd);
 960                 return 0;
 961         }
 962
 963         if (!qedf->pdev->msix_enabled) {
 964                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 965                     "Completing sc_cmd=%p DID_NO_CONNECT as MSI-X is not enabled.\n",
 966                     sc_cmd);
 967                 sc_cmd->result = DID_NO_CONNECT << 16;
 968                 scsi_done(sc_cmd);
 969                 return 0;
 970         }
 971
 972         rval = fc_remote_port_chkready(rport);
 973         if (rval) {
 974                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
 975                           "fc_remote_port_chkready failed=0x%x for port_id=0x%06x.\n",
 976                           rval, rport->port_id);
 977                 sc_cmd->result = rval;
 978                 scsi_done(sc_cmd);
 979                 return 0;
 980         }
 981
 982         /* Retry command if we are doing a qed drain operation */
 983         if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
 984                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Drain active.\n");
 985                 rc = SCSI_MLQUEUE_HOST_BUSY;
 986                 goto exit_qcmd;
 987         }
 988
 989         if (lport->state != LPORT_ST_READY ||
 990             atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
 991                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Link down.\n");
 992                 rc = SCSI_MLQUEUE_HOST_BUSY;
 993                 goto exit_qcmd;
 994         }
 995
 996         /* rport and tgt are allocated together, so tgt should be non-NULL */
 997         fcport = (struct qedf_rport *)&rp[1];
 998
 999         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
1000             test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1001                 /*
1002                  * Session is not offloaded yet. Let SCSI-ml retry
1003                  * the command.
1004                  */
1005                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1006                 goto exit_qcmd;
1007         }
1008
1009         atomic_inc(&fcport->ios_to_queue);
1010
1011         if (fcport->retry_delay_timestamp) {
1012                 /* Take fcport->rport_lock for resetting the delay_timestamp */
1013                 spin_lock_irqsave(&fcport->rport_lock, flags);
1014                 if (time_after(jiffies, fcport->retry_delay_timestamp)) {
1015                         fcport->retry_delay_timestamp = 0;
1016                 } else {
1017                         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1018                         /* If retry_delay timer is active, flow off the ML */
1019                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1020                         atomic_dec(&fcport->ios_to_queue);
1021                         goto exit_qcmd;
1022                 }
1023                 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1024         }
1025
1026         io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
1027         if (!io_req) {
1028                 rc = SCSI_MLQUEUE_HOST_BUSY;
1029                 atomic_dec(&fcport->ios_to_queue);
1030                 goto exit_qcmd;
1031         }
1032
1033         io_req->sc_cmd = sc_cmd;
1034
1035         /* Take fcport->rport_lock for posting to fcport send queue */
1036         spin_lock_irqsave(&fcport->rport_lock, flags);
1037         if (qedf_post_io_req(fcport, io_req)) {
1038                 QEDF_WARN(&(qedf->dbg_ctx), "Unable to post io_req\n");
1039                 /* Return SQE to pool */
1040                 atomic_inc(&fcport->free_sqes);
1041                 rc = SCSI_MLQUEUE_HOST_BUSY;
1042         }
1043         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1044         atomic_dec(&fcport->ios_to_queue);
1045
1046 exit_qcmd:
1047         return rc;
1048 }
1049
1050 static void qedf_parse_fcp_rsp(struct qedf_ioreq *io_req,
1051                                  struct fcoe_cqe_rsp_info *fcp_rsp)
1052 {
1053         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1054         struct qedf_ctx *qedf = io_req->fcport->qedf;
1055         u8 rsp_flags = fcp_rsp->rsp_flags.flags;
1056         int fcp_sns_len = 0;
1057         int fcp_rsp_len = 0;
1058         uint8_t *rsp_info, *sense_data;
1059
1060         io_req->fcp_status = FC_GOOD;
1061         io_req->fcp_resid = 0;
1062         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1063             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1064                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1065
1066         io_req->scsi_comp_flags = rsp_flags;
1067         io_req->cdb_status = fcp_rsp->scsi_status_code;
1068
1069         if (rsp_flags &
1070             FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID)
1071                 fcp_rsp_len = fcp_rsp->fcp_rsp_len;
1072
1073         if (rsp_flags &
1074             FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID)
1075                 fcp_sns_len = fcp_rsp->fcp_sns_len;
1076
1077         io_req->fcp_rsp_len = fcp_rsp_len;
1078         io_req->fcp_sns_len = fcp_sns_len;
1079         rsp_info = sense_data = io_req->sense_buffer;
1080
1081         /* fetch fcp_rsp_code */
1082         if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1083                 /* Only for task management function */
1084                 io_req->fcp_rsp_code = rsp_info[3];
1085                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1086                     "fcp_rsp_code = %d\n", io_req->fcp_rsp_code);
1087                 /* Adjust sense-data location. */
1088                 sense_data += fcp_rsp_len;
1089         }
1090
1091         if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1092                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1093                     "Truncating sense buffer\n");
1094                 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1095         }
1096
1097         /* The sense buffer can be NULL for TMF commands */
1098         if (sc_cmd->sense_buffer) {
1099                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1100                 if (fcp_sns_len)
1101                         memcpy(sc_cmd->sense_buffer, sense_data,
1102                             fcp_sns_len);
1103         }
1104 }
1105
1106 static void qedf_unmap_sg_list(struct qedf_ctx *qedf, struct qedf_ioreq *io_req)
1107 {
1108         struct scsi_cmnd *sc = io_req->sc_cmd;
1109
1110         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1111                 dma_unmap_sg(&qedf->pdev->dev, scsi_sglist(sc),
1112                     scsi_sg_count(sc), sc->sc_data_direction);
1113                 io_req->bd_tbl->bd_valid = 0;
1114         }
1115 }
1116
1117 void qedf_scsi_completion(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1118         struct qedf_ioreq *io_req)
1119 {
1120         struct scsi_cmnd *sc_cmd;
1121         struct fcoe_cqe_rsp_info *fcp_rsp;
1122         struct qedf_rport *fcport;
1123         int refcount;
1124         u16 scope, qualifier = 0;
1125         u8 fw_residual_flag = 0;
1126         unsigned long flags = 0;
1127         u16 chk_scope = 0;
1128
1129         if (!io_req)
1130                 return;
1131         if (!cqe)
1132                 return;
1133
1134         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1135             test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1136             test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1137                 QEDF_ERR(&qedf->dbg_ctx,
1138                          "io_req xid=0x%x already in cleanup or abort processing or already completed.\n",
1139                          io_req->xid);
1140                 return;
1141         }
1142
1143         sc_cmd = io_req->sc_cmd;
1144         fcp_rsp = &cqe->cqe_info.rsp_info;
1145
1146         if (!sc_cmd) {
1147                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1148                 return;
1149         }
1150
1151         if (!qedf_priv(sc_cmd)->io_req) {
1152                 QEDF_WARN(&(qedf->dbg_ctx),
1153                           "io_req is NULL, returned in another context.\n");
1154                 return;
1155         }
1156
1157         if (!sc_cmd->device) {
1158                 QEDF_ERR(&qedf->dbg_ctx,
1159                          "Device for sc_cmd %p is NULL.\n", sc_cmd);
1160                 return;
1161         }
1162
1163         if (!scsi_cmd_to_rq(sc_cmd)->q) {
1164                 QEDF_WARN(&(qedf->dbg_ctx), "request->q is NULL so request "
1165                    "is not valid, sc_cmd=%p.\n", sc_cmd);
1166                 return;
1167         }
1168
1169         fcport = io_req->fcport;
1170
1171         /*
1172          * When flush is active, let the cmds be completed from the cleanup
1173          * context
1174          */
1175         if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1176             (test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags) &&
1177              sc_cmd->device->lun == (u64)fcport->lun_reset_lun)) {
1178                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1179                           "Dropping good completion xid=0x%x as fcport is flushing",
1180                           io_req->xid);
1181                 return;
1182         }
1183
1184         qedf_parse_fcp_rsp(io_req, fcp_rsp);
1185
1186         qedf_unmap_sg_list(qedf, io_req);
1187
1188         /* Check for FCP transport error */
1189         if (io_req->fcp_rsp_len > 3 && io_req->fcp_rsp_code) {
1190                 QEDF_ERR(&(qedf->dbg_ctx),
1191                     "FCP I/O protocol failure xid=0x%x fcp_rsp_len=%d "
1192                     "fcp_rsp_code=%d.\n", io_req->xid, io_req->fcp_rsp_len,
1193                     io_req->fcp_rsp_code);
1194                 sc_cmd->result = DID_BUS_BUSY << 16;
1195                 goto out;
1196         }
1197
1198         fw_residual_flag = GET_FIELD(cqe->cqe_info.rsp_info.fw_error_flags,
1199             FCOE_CQE_RSP_INFO_FW_UNDERRUN);
1200         if (fw_residual_flag) {
1201                 QEDF_ERR(&qedf->dbg_ctx,
1202                          "Firmware detected underrun: xid=0x%x fcp_rsp.flags=0x%02x fcp_resid=%d fw_residual=0x%x lba=%02x%02x%02x%02x.\n",
1203                          io_req->xid, fcp_rsp->rsp_flags.flags,
1204                          io_req->fcp_resid,
1205                          cqe->cqe_info.rsp_info.fw_residual, sc_cmd->cmnd[2],
1206                          sc_cmd->cmnd[3], sc_cmd->cmnd[4], sc_cmd->cmnd[5]);
1207
1208                 if (io_req->cdb_status == 0)
1209                         sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
1210                 else
1211                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1212
1213                 /*
1214                  * Set resid to the whole buffer length so we won't try to resue
1215                  * any previously data.
1216                  */
1217                 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1218                 goto out;
1219         }
1220
1221         switch (io_req->fcp_status) {
1222         case FC_GOOD:
1223                 if (io_req->cdb_status == 0) {
1224                         /* Good I/O completion */
1225                         sc_cmd->result = DID_OK << 16;
1226                 } else {
1227                         refcount = kref_read(&io_req->refcount);
1228                         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1229                             "%d:0:%d:%lld xid=0x%0x op=0x%02x "
1230                             "lba=%02x%02x%02x%02x cdb_status=%d "
1231                             "fcp_resid=0x%x refcount=%d.\n",
1232                             qedf->lport->host->host_no, sc_cmd->device->id,
1233                             sc_cmd->device->lun, io_req->xid,
1234                             sc_cmd->cmnd[0], sc_cmd->cmnd[2], sc_cmd->cmnd[3],
1235                             sc_cmd->cmnd[4], sc_cmd->cmnd[5],
1236                             io_req->cdb_status, io_req->fcp_resid,
1237                             refcount);
1238                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1239
1240                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1241                             io_req->cdb_status == SAM_STAT_BUSY) {
1242                                 /*
1243                                  * Check whether we need to set retry_delay at
1244                                  * all based on retry_delay module parameter
1245                                  * and the status qualifier.
1246                                  */
1247
1248                                 /* Upper 2 bits */
1249                                 scope = fcp_rsp->retry_delay_timer & 0xC000;
1250                                 /* Lower 14 bits */
1251                                 qualifier = fcp_rsp->retry_delay_timer & 0x3FFF;
1252
1253                                 if (qedf_retry_delay)
1254                                         chk_scope = 1;
1255                                 /* Record stats */
1256                                 if (io_req->cdb_status ==
1257                                     SAM_STAT_TASK_SET_FULL)
1258                                         qedf->task_set_fulls++;
1259                                 else
1260                                         qedf->busy++;
1261                         }
1262                 }
1263                 if (io_req->fcp_resid)
1264                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1265
1266                 if (chk_scope == 1) {
1267                         if ((scope == 1 || scope == 2) &&
1268                             (qualifier > 0 && qualifier <= 0x3FEF)) {
1269                                 /* Check we don't go over the max */
1270                                 if (qualifier > QEDF_RETRY_DELAY_MAX) {
1271                                         qualifier = QEDF_RETRY_DELAY_MAX;
1272                                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1273                                                   "qualifier = %d\n",
1274                                                   (fcp_rsp->retry_delay_timer &
1275                                                   0x3FFF));
1276                                 }
1277                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1278                                           "Scope = %d and qualifier = %d",
1279                                           scope, qualifier);
1280                                 /*  Take fcport->rport_lock to
1281                                  *  update the retry_delay_timestamp
1282                                  */
1283                                 spin_lock_irqsave(&fcport->rport_lock, flags);
1284                                 fcport->retry_delay_timestamp =
1285                                         jiffies + (qualifier * HZ / 10);
1286                                 spin_unlock_irqrestore(&fcport->rport_lock,
1287                                                        flags);
1288
1289                         } else {
1290                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1291                                           "combination of scope = %d and qualifier = %d is not handled in qedf.\n",
1292                                           scope, qualifier);
1293                         }
1294                 }
1295                 break;
1296         default:
1297                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "fcp_status=%d.\n",
1298                            io_req->fcp_status);
1299                 break;
1300         }
1301
1302 out:
1303         if (qedf_io_tracing)
1304                 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_RSP);
1305
1306         /*
1307          * We wait till the end of the function to clear the
1308          * outstanding bit in case we need to send an abort
1309          */
1310         clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1311
1312         io_req->sc_cmd = NULL;
1313         qedf_priv(sc_cmd)->io_req =  NULL;
1314         scsi_done(sc_cmd);
1315         kref_put(&io_req->refcount, qedf_release_cmd);
1316 }
1317
1318 /* Return a SCSI command in some other context besides a normal completion */
1319 void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
1320         int result)
1321 {
1322         struct scsi_cmnd *sc_cmd;
1323         int refcount;
1324
1325         if (!io_req) {
1326                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "io_req is NULL\n");
1327                 return;
1328         }
1329
1330         if (test_and_set_bit(QEDF_CMD_ERR_SCSI_DONE, &io_req->flags)) {
1331                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1332                           "io_req:%p scsi_done handling already done\n",
1333                           io_req);
1334                 return;
1335         }
1336
1337         /*
1338          * We will be done with this command after this call so clear the
1339          * outstanding bit.
1340          */
1341         clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1342
1343         sc_cmd = io_req->sc_cmd;
1344
1345         if (!sc_cmd) {
1346                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1347                 return;
1348         }
1349
1350         if (!virt_addr_valid(sc_cmd)) {
1351                 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd=%p is not valid.", sc_cmd);
1352                 goto bad_scsi_ptr;
1353         }
1354
1355         if (!qedf_priv(sc_cmd)->io_req) {
1356                 QEDF_WARN(&(qedf->dbg_ctx),
1357                           "io_req is NULL, returned in another context.\n");
1358                 return;
1359         }
1360
1361         if (!sc_cmd->device) {
1362                 QEDF_ERR(&qedf->dbg_ctx, "Device for sc_cmd %p is NULL.\n",
1363                          sc_cmd);
1364                 goto bad_scsi_ptr;
1365         }
1366
1367         if (!virt_addr_valid(sc_cmd->device)) {
1368                 QEDF_ERR(&qedf->dbg_ctx,
1369                          "Device pointer for sc_cmd %p is bad.\n", sc_cmd);
1370                 goto bad_scsi_ptr;
1371         }
1372
1373         if (!sc_cmd->sense_buffer) {
1374                 QEDF_ERR(&qedf->dbg_ctx,
1375                          "sc_cmd->sense_buffer for sc_cmd %p is NULL.\n",
1376                          sc_cmd);
1377                 goto bad_scsi_ptr;
1378         }
1379
1380         if (!virt_addr_valid(sc_cmd->sense_buffer)) {
1381                 QEDF_ERR(&qedf->dbg_ctx,
1382                          "sc_cmd->sense_buffer for sc_cmd %p is bad.\n",
1383                          sc_cmd);
1384                 goto bad_scsi_ptr;
1385         }
1386
1387         qedf_unmap_sg_list(qedf, io_req);
1388
1389         sc_cmd->result = result << 16;
1390         refcount = kref_read(&io_req->refcount);
1391         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "%d:0:%d:%lld: Completing "
1392             "sc_cmd=%p result=0x%08x op=0x%02x lba=0x%02x%02x%02x%02x, "
1393             "allowed=%d retries=%d refcount=%d.\n",
1394             qedf->lport->host->host_no, sc_cmd->device->id,
1395             sc_cmd->device->lun, sc_cmd, sc_cmd->result, sc_cmd->cmnd[0],
1396             sc_cmd->cmnd[2], sc_cmd->cmnd[3], sc_cmd->cmnd[4],
1397             sc_cmd->cmnd[5], sc_cmd->allowed, sc_cmd->retries,
1398             refcount);
1399
1400         /*
1401          * Set resid to the whole buffer length so we won't try to resue any
1402          * previously read data
1403          */
1404         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1405
1406         if (qedf_io_tracing)
1407                 qedf_trace_io(io_req->fcport, io_req, QEDF_IO_TRACE_RSP);
1408
1409         io_req->sc_cmd = NULL;
1410         qedf_priv(sc_cmd)->io_req = NULL;
1411         scsi_done(sc_cmd);
1412         kref_put(&io_req->refcount, qedf_release_cmd);
1413         return;
1414
1415 bad_scsi_ptr:
1416         /*
1417          * Clear the io_req->sc_cmd backpointer so we don't try to process
1418          * this again
1419          */
1420         io_req->sc_cmd = NULL;
1421         kref_put(&io_req->refcount, qedf_release_cmd);  /* ID: 001 */
1422 }
1423
1424 /*
1425  * Handle warning type CQE completions. This is mainly used for REC timer
1426  * popping.
1427  */
1428 void qedf_process_warning_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1429         struct qedf_ioreq *io_req)
1430 {
1431         int rval, i;
1432         struct qedf_rport *fcport = io_req->fcport;
1433         u64 err_warn_bit_map;
1434         u8 err_warn = 0xff;
1435
1436         if (!cqe) {
1437                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1438                           "cqe is NULL for io_req %p xid=0x%x\n",
1439                           io_req, io_req->xid);
1440                 return;
1441         }
1442
1443         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Warning CQE, "
1444                   "xid=0x%x\n", io_req->xid);
1445         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1446                   "err_warn_bitmap=%08x:%08x\n",
1447                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1448                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1449         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1450                   "rx_buff_off=%08x, rx_id=%04x\n",
1451                   le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1452                   le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1453                   le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1454
1455         /* Normalize the error bitmap value to an just an unsigned int */
1456         err_warn_bit_map = (u64)
1457             ((u64)cqe->cqe_info.err_info.err_warn_bitmap_hi << 32) |
1458             (u64)cqe->cqe_info.err_info.err_warn_bitmap_lo;
1459         for (i = 0; i < 64; i++) {
1460                 if (err_warn_bit_map & (u64)((u64)1 << i)) {
1461                         err_warn = i;
1462                         break;
1463                 }
1464         }
1465
1466         /* Check if REC TOV expired if this is a tape device */
1467         if (fcport->dev_type == QEDF_RPORT_TYPE_TAPE) {
1468                 if (err_warn ==
1469                     FCOE_WARNING_CODE_REC_TOV_TIMER_EXPIRATION) {
1470                         QEDF_ERR(&(qedf->dbg_ctx), "REC timer expired.\n");
1471                         if (!test_bit(QEDF_CMD_SRR_SENT, &io_req->flags)) {
1472                                 io_req->rx_buf_off =
1473                                     cqe->cqe_info.err_info.rx_buf_off;
1474                                 io_req->tx_buf_off =
1475                                     cqe->cqe_info.err_info.tx_buf_off;
1476                                 io_req->rx_id = cqe->cqe_info.err_info.rx_id;
1477                                 rval = qedf_send_rec(io_req);
1478                                 /*
1479                                  * We only want to abort the io_req if we
1480                                  * can't queue the REC command as we want to
1481                                  * keep the exchange open for recovery.
1482                                  */
1483                                 if (rval)
1484                                         goto send_abort;
1485                         }
1486                         return;
1487                 }
1488         }
1489
1490 send_abort:
1491         init_completion(&io_req->abts_done);
1492         rval = qedf_initiate_abts(io_req, true);
1493         if (rval)
1494                 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1495 }
1496
1497 /* Cleanup a command when we receive an error detection completion */
1498 void qedf_process_error_detect(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1499         struct qedf_ioreq *io_req)
1500 {
1501         int rval;
1502
1503         if (io_req == NULL) {
1504                 QEDF_INFO(NULL, QEDF_LOG_IO, "io_req is NULL.\n");
1505                 return;
1506         }
1507
1508         if (io_req->fcport == NULL) {
1509                 QEDF_INFO(NULL, QEDF_LOG_IO, "fcport is NULL.\n");
1510                 return;
1511         }
1512
1513         if (!cqe) {
1514                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1515                         "cqe is NULL for io_req %p\n", io_req);
1516                 return;
1517         }
1518
1519         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Error detection CQE, "
1520                   "xid=0x%x\n", io_req->xid);
1521         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1522                   "err_warn_bitmap=%08x:%08x\n",
1523                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1524                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1525         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1526                   "rx_buff_off=%08x, rx_id=%04x\n",
1527                   le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1528                   le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1529                   le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1530
1531         /* When flush is active, let the cmds be flushed out from the cleanup context */
1532         if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &io_req->fcport->flags) ||
1533                 (test_bit(QEDF_RPORT_IN_LUN_RESET, &io_req->fcport->flags) &&
1534                  io_req->sc_cmd->device->lun == (u64)io_req->fcport->lun_reset_lun)) {
1535                 QEDF_ERR(&qedf->dbg_ctx,
1536                         "Dropping EQE for xid=0x%x as fcport is flushing",
1537                         io_req->xid);
1538                 return;
1539         }
1540
1541         if (qedf->stop_io_on_error) {
1542                 qedf_stop_all_io(qedf);
1543                 return;
1544         }
1545
1546         init_completion(&io_req->abts_done);
1547         rval = qedf_initiate_abts(io_req, true);
1548         if (rval)
1549                 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1550 }
1551
1552 static void qedf_flush_els_req(struct qedf_ctx *qedf,
1553         struct qedf_ioreq *els_req)
1554 {
1555         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1556             "Flushing ELS request xid=0x%x refcount=%d.\n", els_req->xid,
1557             kref_read(&els_req->refcount));
1558
1559         /*
1560          * Need to distinguish this from a timeout when calling the
1561          * els_req->cb_func.
1562          */
1563         els_req->event = QEDF_IOREQ_EV_ELS_FLUSH;
1564
1565         clear_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
1566
1567         /* Cancel the timer */
1568         cancel_delayed_work_sync(&els_req->timeout_work);
1569
1570         /* Call callback function to complete command */
1571         if (els_req->cb_func && els_req->cb_arg) {
1572                 els_req->cb_func(els_req->cb_arg);
1573                 els_req->cb_arg = NULL;
1574         }
1575
1576         /* Release kref for original initiate_els */
1577         kref_put(&els_req->refcount, qedf_release_cmd);
1578 }
1579
1580 /* A value of -1 for lun is a wild card that means flush all
1581  * active SCSI I/Os for the target.
1582  */
1583 void qedf_flush_active_ios(struct qedf_rport *fcport, int lun)
1584 {
1585         struct qedf_ioreq *io_req;
1586         struct qedf_ctx *qedf;
1587         struct qedf_cmd_mgr *cmd_mgr;
1588         int i, rc;
1589         unsigned long flags;
1590         int flush_cnt = 0;
1591         int wait_cnt = 100;
1592         int refcount = 0;
1593
1594         if (!fcport) {
1595                 QEDF_ERR(NULL, "fcport is NULL\n");
1596                 return;
1597         }
1598
1599         /* Check that fcport is still offloaded */
1600         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1601                 QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
1602                 return;
1603         }
1604
1605         qedf = fcport->qedf;
1606
1607         if (!qedf) {
1608                 QEDF_ERR(NULL, "qedf is NULL.\n");
1609                 return;
1610         }
1611
1612         /* Only wait for all commands to be queued in the Upload context */
1613         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1614             (lun == -1)) {
1615                 while (atomic_read(&fcport->ios_to_queue)) {
1616                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1617                                   "Waiting for %d I/Os to be queued\n",
1618                                   atomic_read(&fcport->ios_to_queue));
1619                         if (wait_cnt == 0) {
1620                                 QEDF_ERR(NULL,
1621                                          "%d IOs request could not be queued\n",
1622                                          atomic_read(&fcport->ios_to_queue));
1623                         }
1624                         msleep(20);
1625                         wait_cnt--;
1626                 }
1627         }
1628
1629         cmd_mgr = qedf->cmd_mgr;
1630
1631         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1632                   "Flush active i/o's num=0x%x fcport=0x%p port_id=0x%06x scsi_id=%d.\n",
1633                   atomic_read(&fcport->num_active_ios), fcport,
1634                   fcport->rdata->ids.port_id, fcport->rport->scsi_target_id);
1635         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Locking flush mutex.\n");
1636
1637         mutex_lock(&qedf->flush_mutex);
1638         if (lun == -1) {
1639                 set_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1640         } else {
1641                 set_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1642                 fcport->lun_reset_lun = lun;
1643         }
1644
1645         for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1646                 io_req = &cmd_mgr->cmds[i];
1647
1648                 if (!io_req)
1649                         continue;
1650                 if (!io_req->fcport)
1651                         continue;
1652
1653                 spin_lock_irqsave(&cmd_mgr->lock, flags);
1654
1655                 if (io_req->alloc) {
1656                         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1657                                 if (io_req->cmd_type == QEDF_SCSI_CMD)
1658                                         QEDF_ERR(&qedf->dbg_ctx,
1659                                                  "Allocated but not queued, xid=0x%x\n",
1660                                                  io_req->xid);
1661                         }
1662                         spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1663                 } else {
1664                         spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1665                         continue;
1666                 }
1667
1668                 if (io_req->fcport != fcport)
1669                         continue;
1670
1671                 /* In case of ABTS, CMD_OUTSTANDING is cleared on ABTS response,
1672                  * but RRQ is still pending.
1673                  * Workaround: Within qedf_send_rrq, we check if the fcport is
1674                  * NULL, and we drop the ref on the io_req to clean it up.
1675                  */
1676                 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1677                         refcount = kref_read(&io_req->refcount);
1678                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1679                                   "Not outstanding, xid=0x%x, cmd_type=%d refcount=%d.\n",
1680                                   io_req->xid, io_req->cmd_type, refcount);
1681                         /* If RRQ work has been queue, try to cancel it and
1682                          * free the io_req
1683                          */
1684                         if (atomic_read(&io_req->state) ==
1685                             QEDFC_CMD_ST_RRQ_WAIT) {
1686                                 if (cancel_delayed_work_sync
1687                                     (&io_req->rrq_work)) {
1688                                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1689                                                   "Putting reference for pending RRQ work xid=0x%x.\n",
1690                                                   io_req->xid);
1691                                         /* ID: 003 */
1692                                         kref_put(&io_req->refcount,
1693                                                  qedf_release_cmd);
1694                                 }
1695                         }
1696                         continue;
1697                 }
1698
1699                 /* Only consider flushing ELS during target reset */
1700                 if (io_req->cmd_type == QEDF_ELS &&
1701                     lun == -1) {
1702                         rc = kref_get_unless_zero(&io_req->refcount);
1703                         if (!rc) {
1704                                 QEDF_ERR(&(qedf->dbg_ctx),
1705                                     "Could not get kref for ELS io_req=0x%p xid=0x%x.\n",
1706                                     io_req, io_req->xid);
1707                                 continue;
1708                         }
1709                         qedf_initiate_cleanup(io_req, false);
1710                         flush_cnt++;
1711                         qedf_flush_els_req(qedf, io_req);
1712
1713                         /*
1714                          * Release the kref and go back to the top of the
1715                          * loop.
1716                          */
1717                         goto free_cmd;
1718                 }
1719
1720                 if (io_req->cmd_type == QEDF_ABTS) {
1721                         /* ID: 004 */
1722                         rc = kref_get_unless_zero(&io_req->refcount);
1723                         if (!rc) {
1724                                 QEDF_ERR(&(qedf->dbg_ctx),
1725                                     "Could not get kref for abort io_req=0x%p xid=0x%x.\n",
1726                                     io_req, io_req->xid);
1727                                 continue;
1728                         }
1729                         if (lun != -1 && io_req->lun != lun)
1730                                 goto free_cmd;
1731
1732                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1733                             "Flushing abort xid=0x%x.\n", io_req->xid);
1734
1735                         if (cancel_delayed_work_sync(&io_req->rrq_work)) {
1736                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1737                                           "Putting ref for cancelled RRQ work xid=0x%x.\n",
1738                                           io_req->xid);
1739                                 kref_put(&io_req->refcount, qedf_release_cmd);
1740                         }
1741
1742                         if (cancel_delayed_work_sync(&io_req->timeout_work)) {
1743                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1744                                           "Putting ref for cancelled tmo work xid=0x%x.\n",
1745                                           io_req->xid);
1746                                 qedf_initiate_cleanup(io_req, true);
1747                                 /* Notify eh_abort handler that ABTS is
1748                                  * complete
1749                                  */
1750                                 complete(&io_req->abts_done);
1751                                 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1752                                 /* ID: 002 */
1753                                 kref_put(&io_req->refcount, qedf_release_cmd);
1754                         }
1755                         flush_cnt++;
1756                         goto free_cmd;
1757                 }
1758
1759                 if (!io_req->sc_cmd)
1760                         continue;
1761                 if (!io_req->sc_cmd->device) {
1762                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1763                                   "Device backpointer NULL for sc_cmd=%p.\n",
1764                                   io_req->sc_cmd);
1765                         /* Put reference for non-existent scsi_cmnd */
1766                         io_req->sc_cmd = NULL;
1767                         qedf_initiate_cleanup(io_req, false);
1768                         kref_put(&io_req->refcount, qedf_release_cmd);
1769                         continue;
1770                 }
1771                 if (lun > -1) {
1772                         if (io_req->lun != lun)
1773                                 continue;
1774                 }
1775
1776                 /*
1777                  * Use kref_get_unless_zero in the unlikely case the command
1778                  * we're about to flush was completed in the normal SCSI path
1779                  */
1780                 rc = kref_get_unless_zero(&io_req->refcount);
1781                 if (!rc) {
1782                         QEDF_ERR(&(qedf->dbg_ctx), "Could not get kref for "
1783                             "io_req=0x%p xid=0x%x\n", io_req, io_req->xid);
1784                         continue;
1785                 }
1786
1787                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1788                     "Cleanup xid=0x%x.\n", io_req->xid);
1789                 flush_cnt++;
1790
1791                 /* Cleanup task and return I/O mid-layer */
1792                 qedf_initiate_cleanup(io_req, true);
1793
1794 free_cmd:
1795                 kref_put(&io_req->refcount, qedf_release_cmd);  /* ID: 004 */
1796         }
1797
1798         wait_cnt = 60;
1799         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1800                   "Flushed 0x%x I/Os, active=0x%x.\n",
1801                   flush_cnt, atomic_read(&fcport->num_active_ios));
1802         /* Only wait for all commands to complete in the Upload context */
1803         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1804             (lun == -1)) {
1805                 while (atomic_read(&fcport->num_active_ios)) {
1806                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1807                                   "Flushed 0x%x I/Os, active=0x%x cnt=%d.\n",
1808                                   flush_cnt,
1809                                   atomic_read(&fcport->num_active_ios),
1810                                   wait_cnt);
1811                         if (wait_cnt == 0) {
1812                                 QEDF_ERR(&qedf->dbg_ctx,
1813                                          "Flushed %d I/Os, active=%d.\n",
1814                                          flush_cnt,
1815                                          atomic_read(&fcport->num_active_ios));
1816                                 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1817                                         io_req = &cmd_mgr->cmds[i];
1818                                         if (io_req->fcport &&
1819                                             io_req->fcport == fcport) {
1820                                                 refcount =
1821                                                 kref_read(&io_req->refcount);
1822                                                 set_bit(QEDF_CMD_DIRTY,
1823                                                         &io_req->flags);
1824                                                 QEDF_ERR(&qedf->dbg_ctx,
1825                                                          "Outstanding io_req =%p xid=0x%x flags=0x%lx, sc_cmd=%p refcount=%d cmd_type=%d.\n",
1826                                                          io_req, io_req->xid,
1827                                                          io_req->flags,
1828                                                          io_req->sc_cmd,
1829                                                          refcount,
1830                                                          io_req->cmd_type);
1831                                         }
1832                                 }
1833                                 WARN_ON(1);
1834                                 break;
1835                         }
1836                         msleep(500);
1837                         wait_cnt--;
1838                 }
1839         }
1840
1841         clear_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1842         clear_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1843         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Unlocking flush mutex.\n");
1844         mutex_unlock(&qedf->flush_mutex);
1845 }
1846
1847 /*
1848  * Initiate a ABTS middle path command. Note that we don't have to initialize
1849  * the task context for an ABTS task.
1850  */
1851 int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
1852 {
1853         struct fc_lport *lport;
1854         struct qedf_rport *fcport = io_req->fcport;
1855         struct fc_rport_priv *rdata;
1856         struct qedf_ctx *qedf;
1857         u16 xid;
1858         int rc = 0;
1859         unsigned long flags;
1860         struct fcoe_wqe *sqe;
1861         u16 sqe_idx;
1862         int refcount = 0;
1863
1864         /* Sanity check qedf_rport before dereferencing any pointers */
1865         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1866                 QEDF_ERR(NULL, "tgt not offloaded\n");
1867                 rc = 1;
1868                 goto out;
1869         }
1870
1871         qedf = fcport->qedf;
1872         rdata = fcport->rdata;
1873
1874         if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
1875                 QEDF_ERR(&qedf->dbg_ctx, "stale rport\n");
1876                 rc = 1;
1877                 goto out;
1878         }
1879
1880         lport = qedf->lport;
1881
1882         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
1883                 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
1884                 rc = 1;
1885                 goto drop_rdata_kref;
1886         }
1887
1888         if (atomic_read(&qedf->link_down_tmo_valid) > 0) {
1889                 QEDF_ERR(&(qedf->dbg_ctx), "link_down_tmo active.\n");
1890                 rc = 1;
1891                 goto drop_rdata_kref;
1892         }
1893
1894         /* Ensure room on SQ */
1895         if (!atomic_read(&fcport->free_sqes)) {
1896                 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
1897                 rc = 1;
1898                 goto drop_rdata_kref;
1899         }
1900
1901         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1902                 QEDF_ERR(&qedf->dbg_ctx, "fcport is uploading.\n");
1903                 rc = 1;
1904                 goto drop_rdata_kref;
1905         }
1906
1907         spin_lock_irqsave(&fcport->rport_lock, flags);
1908         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1909             test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1910             test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1911                 QEDF_ERR(&qedf->dbg_ctx,
1912                          "io_req xid=0x%x sc_cmd=%p already in cleanup or abort processing or already completed.\n",
1913                          io_req->xid, io_req->sc_cmd);
1914                 rc = 1;
1915                 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1916                 goto drop_rdata_kref;
1917         }
1918
1919         /* Set the command type to abort */
1920         io_req->cmd_type = QEDF_ABTS;
1921         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1922
1923         kref_get(&io_req->refcount);
1924
1925         xid = io_req->xid;
1926         qedf->control_requests++;
1927         qedf->packet_aborts++;
1928
1929         io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
1930
1931         set_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1932         refcount = kref_read(&io_req->refcount);
1933         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
1934                   "ABTS io_req xid = 0x%x refcount=%d\n",
1935                   xid, refcount);
1936
1937         qedf_cmd_timer_set(qedf, io_req, QEDF_ABORT_TIMEOUT);
1938
1939         spin_lock_irqsave(&fcport->rport_lock, flags);
1940
1941         sqe_idx = qedf_get_sqe_idx(fcport);
1942         sqe = &fcport->sq[sqe_idx];
1943         memset(sqe, 0, sizeof(struct fcoe_wqe));
1944         io_req->task_params->sqe = sqe;
1945
1946         init_initiator_abort_fcoe_task(io_req->task_params);
1947         qedf_ring_doorbell(fcport);
1948
1949         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1950
1951 drop_rdata_kref:
1952         kref_put(&rdata->kref, fc_rport_destroy);
1953 out:
1954         return rc;
1955 }
1956
1957 void qedf_process_abts_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1958         struct qedf_ioreq *io_req)
1959 {
1960         uint32_t r_ctl;
1961         int rc;
1962         struct qedf_rport *fcport = io_req->fcport;
1963
1964         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "Entered with xid = "
1965                    "0x%x cmd_type = %d\n", io_req->xid, io_req->cmd_type);
1966
1967         r_ctl = cqe->cqe_info.abts_info.r_ctl;
1968
1969         /* This was added at a point when we were scheduling abts_compl &
1970          * cleanup_compl on different CPUs and there was a possibility of
1971          * the io_req to be freed from the other context before we got here.
1972          */
1973         if (!fcport) {
1974                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1975                           "Dropping ABTS completion xid=0x%x as fcport is NULL",
1976                           io_req->xid);
1977                 return;
1978         }
1979
1980         /*
1981          * When flush is active, let the cmds be completed from the cleanup
1982          * context
1983          */
1984         if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1985             test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags)) {
1986                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1987                           "Dropping ABTS completion xid=0x%x as fcport is flushing",
1988                           io_req->xid);
1989                 return;
1990         }
1991
1992         if (!cancel_delayed_work(&io_req->timeout_work)) {
1993                 QEDF_ERR(&qedf->dbg_ctx,
1994                          "Wasn't able to cancel abts timeout work.\n");
1995         }
1996
1997         switch (r_ctl) {
1998         case FC_RCTL_BA_ACC:
1999                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
2000                     "ABTS response - ACC Send RRQ after R_A_TOV\n");
2001                 io_req->event = QEDF_IOREQ_EV_ABORT_SUCCESS;
2002                 rc = kref_get_unless_zero(&io_req->refcount);   /* ID: 003 */
2003                 if (!rc) {
2004                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2005                                   "kref is already zero so ABTS was already completed or flushed xid=0x%x.\n",
2006                                   io_req->xid);
2007                         return;
2008                 }
2009                 /*
2010                  * Dont release this cmd yet. It will be relesed
2011                  * after we get RRQ response
2012                  */
2013                 queue_delayed_work(qedf->dpc_wq, &io_req->rrq_work,
2014                     msecs_to_jiffies(qedf->lport->r_a_tov));
2015                 atomic_set(&io_req->state, QEDFC_CMD_ST_RRQ_WAIT);
2016                 break;
2017         /* For error cases let the cleanup return the command */
2018         case FC_RCTL_BA_RJT:
2019                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
2020                    "ABTS response - RJT\n");
2021                 io_req->event = QEDF_IOREQ_EV_ABORT_FAILED;
2022                 break;
2023         default:
2024                 QEDF_ERR(&(qedf->dbg_ctx), "Unknown ABTS response\n");
2025                 break;
2026         }
2027
2028         clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
2029
2030         if (io_req->sc_cmd) {
2031                 if (!io_req->return_scsi_cmd_on_abts)
2032                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2033                                   "Not call scsi_done for xid=0x%x.\n",
2034                                   io_req->xid);
2035                 if (io_req->return_scsi_cmd_on_abts)
2036                         qedf_scsi_done(qedf, io_req, DID_ERROR);
2037         }
2038
2039         /* Notify eh_abort handler that ABTS is complete */
2040         complete(&io_req->abts_done);
2041
2042         kref_put(&io_req->refcount, qedf_release_cmd);
2043 }
2044
2045 int qedf_init_mp_req(struct qedf_ioreq *io_req)
2046 {
2047         struct qedf_mp_req *mp_req;
2048         struct scsi_sge *mp_req_bd;
2049         struct scsi_sge *mp_resp_bd;
2050         struct qedf_ctx *qedf = io_req->fcport->qedf;
2051         dma_addr_t addr;
2052         uint64_t sz;
2053
2054         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_MP_REQ, "Entered.\n");
2055
2056         mp_req = (struct qedf_mp_req *)&(io_req->mp_req);
2057         memset(mp_req, 0, sizeof(struct qedf_mp_req));
2058
2059         if (io_req->cmd_type != QEDF_ELS) {
2060                 mp_req->req_len = sizeof(struct fcp_cmnd);
2061                 io_req->data_xfer_len = mp_req->req_len;
2062         } else
2063                 mp_req->req_len = io_req->data_xfer_len;
2064
2065         mp_req->req_buf = dma_alloc_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
2066             &mp_req->req_buf_dma, GFP_KERNEL);
2067         if (!mp_req->req_buf) {
2068                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req buffer\n");
2069                 qedf_free_mp_resc(io_req);
2070                 return -ENOMEM;
2071         }
2072
2073         mp_req->resp_buf = dma_alloc_coherent(&qedf->pdev->dev,
2074             QEDF_PAGE_SIZE, &mp_req->resp_buf_dma, GFP_KERNEL);
2075         if (!mp_req->resp_buf) {
2076                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc TM resp "
2077                           "buffer\n");
2078                 qedf_free_mp_resc(io_req);
2079                 return -ENOMEM;
2080         }
2081
2082         /* Allocate and map mp_req_bd and mp_resp_bd */
2083         sz = sizeof(struct scsi_sge);
2084         mp_req->mp_req_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2085             &mp_req->mp_req_bd_dma, GFP_KERNEL);
2086         if (!mp_req->mp_req_bd) {
2087                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req bd\n");
2088                 qedf_free_mp_resc(io_req);
2089                 return -ENOMEM;
2090         }
2091
2092         mp_req->mp_resp_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2093             &mp_req->mp_resp_bd_dma, GFP_KERNEL);
2094         if (!mp_req->mp_resp_bd) {
2095                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP resp bd\n");
2096                 qedf_free_mp_resc(io_req);
2097                 return -ENOMEM;
2098         }
2099
2100         /* Fill bd table */
2101         addr = mp_req->req_buf_dma;
2102         mp_req_bd = mp_req->mp_req_bd;
2103         mp_req_bd->sge_addr.lo = U64_LO(addr);
2104         mp_req_bd->sge_addr.hi = U64_HI(addr);
2105         mp_req_bd->sge_len = QEDF_PAGE_SIZE;
2106
2107         /*
2108          * MP buffer is either a task mgmt command or an ELS.
2109          * So the assumption is that it consumes a single bd
2110          * entry in the bd table
2111          */
2112         mp_resp_bd = mp_req->mp_resp_bd;
2113         addr = mp_req->resp_buf_dma;
2114         mp_resp_bd->sge_addr.lo = U64_LO(addr);
2115         mp_resp_bd->sge_addr.hi = U64_HI(addr);
2116         mp_resp_bd->sge_len = QEDF_PAGE_SIZE;
2117
2118         return 0;
2119 }
2120
2121 /*
2122  * Last ditch effort to clear the port if it's stuck. Used only after a
2123  * cleanup task times out.
2124  */
2125 static void qedf_drain_request(struct qedf_ctx *qedf)
2126 {
2127         if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
2128                 QEDF_ERR(&(qedf->dbg_ctx), "MCP drain already active.\n");
2129                 return;
2130         }
2131
2132         /* Set bit to return all queuecommand requests as busy */
2133         set_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2134
2135         /* Call qed drain request for function. Should be synchronous */
2136         qed_ops->common->drain(qedf->cdev);
2137
2138         /* Settle time for CQEs to be returned */
2139         msleep(100);
2140
2141         /* Unplug and continue */
2142         clear_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2143 }
2144
2145 /*
2146  * Returns SUCCESS if the cleanup task does not timeout, otherwise return
2147  * FAILURE.
2148  */
2149 int qedf_initiate_cleanup(struct qedf_ioreq *io_req,
2150         bool return_scsi_cmd_on_abts)
2151 {
2152         struct qedf_rport *fcport;
2153         struct qedf_ctx *qedf;
2154         int tmo = 0;
2155         int rc = SUCCESS;
2156         unsigned long flags;
2157         struct fcoe_wqe *sqe;
2158         u16 sqe_idx;
2159         int refcount = 0;
2160
2161         fcport = io_req->fcport;
2162         if (!fcport) {
2163                 QEDF_ERR(NULL, "fcport is NULL.\n");
2164                 return SUCCESS;
2165         }
2166
2167         /* Sanity check qedf_rport before dereferencing any pointers */
2168         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2169                 QEDF_ERR(NULL, "tgt not offloaded\n");
2170                 return SUCCESS;
2171         }
2172
2173         qedf = fcport->qedf;
2174         if (!qedf) {
2175                 QEDF_ERR(NULL, "qedf is NULL.\n");
2176                 return SUCCESS;
2177         }
2178
2179         if (io_req->cmd_type == QEDF_ELS) {
2180                 goto process_els;
2181         }
2182
2183         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
2184             test_and_set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags)) {
2185                 QEDF_ERR(&(qedf->dbg_ctx), "io_req xid=0x%x already in "
2186                           "cleanup processing or already completed.\n",
2187                           io_req->xid);
2188                 return SUCCESS;
2189         }
2190         set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2191
2192 process_els:
2193         /* Ensure room on SQ */
2194         if (!atomic_read(&fcport->free_sqes)) {
2195                 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
2196                 /* Need to make sure we clear the flag since it was set */
2197                 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2198                 return FAILED;
2199         }
2200
2201         if (io_req->cmd_type == QEDF_CLEANUP) {
2202                 QEDF_ERR(&qedf->dbg_ctx,
2203                          "io_req=0x%x is already a cleanup command cmd_type=%d.\n",
2204                          io_req->xid, io_req->cmd_type);
2205                 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2206                 return SUCCESS;
2207         }
2208
2209         refcount = kref_read(&io_req->refcount);
2210
2211         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
2212                   "Entered xid=0x%x sc_cmd=%p cmd_type=%d flags=0x%lx refcount=%d fcport=%p port_id=0x%06x\n",
2213                   io_req->xid, io_req->sc_cmd, io_req->cmd_type, io_req->flags,
2214                   refcount, fcport, fcport->rdata->ids.port_id);
2215
2216         /* Cleanup cmds re-use the same TID as the original I/O */
2217         spin_lock_irqsave(&fcport->rport_lock, flags);
2218         io_req->cmd_type = QEDF_CLEANUP;
2219         spin_unlock_irqrestore(&fcport->rport_lock, flags);
2220         io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
2221
2222         init_completion(&io_req->cleanup_done);
2223
2224         spin_lock_irqsave(&fcport->rport_lock, flags);
2225
2226         sqe_idx = qedf_get_sqe_idx(fcport);
2227         sqe = &fcport->sq[sqe_idx];
2228         memset(sqe, 0, sizeof(struct fcoe_wqe));
2229         io_req->task_params->sqe = sqe;
2230
2231         init_initiator_cleanup_fcoe_task(io_req->task_params);
2232         qedf_ring_doorbell(fcport);
2233
2234         spin_unlock_irqrestore(&fcport->rport_lock, flags);
2235
2236         tmo = wait_for_completion_timeout(&io_req->cleanup_done,
2237                                           QEDF_CLEANUP_TIMEOUT * HZ);
2238
2239         if (!tmo) {
2240                 rc = FAILED;
2241                 /* Timeout case */
2242                 QEDF_ERR(&(qedf->dbg_ctx), "Cleanup command timeout, "
2243                           "xid=%x.\n", io_req->xid);
2244                 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2245                 /* Issue a drain request if cleanup task times out */
2246                 QEDF_ERR(&(qedf->dbg_ctx), "Issuing MCP drain request.\n");
2247                 qedf_drain_request(qedf);
2248         }
2249
2250         /* If it TASK MGMT handle it, reference will be decreased
2251          * in qedf_execute_tmf
2252          */
2253         if (io_req->tm_flags  == FCP_TMF_LUN_RESET ||
2254             io_req->tm_flags == FCP_TMF_TGT_RESET) {
2255                 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2256                 io_req->sc_cmd = NULL;
2257                 kref_put(&io_req->refcount, qedf_release_cmd);
2258                 complete(&io_req->tm_done);
2259         }
2260
2261         if (io_req->sc_cmd) {
2262                 if (!io_req->return_scsi_cmd_on_abts)
2263                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2264                                   "Not call scsi_done for xid=0x%x.\n",
2265                                   io_req->xid);
2266                 if (io_req->return_scsi_cmd_on_abts)
2267                         qedf_scsi_done(qedf, io_req, DID_ERROR);
2268         }
2269
2270         if (rc == SUCCESS)
2271                 io_req->event = QEDF_IOREQ_EV_CLEANUP_SUCCESS;
2272         else
2273                 io_req->event = QEDF_IOREQ_EV_CLEANUP_FAILED;
2274
2275         return rc;
2276 }
2277
2278 void qedf_process_cleanup_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2279         struct qedf_ioreq *io_req)
2280 {
2281         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid = 0x%x\n",
2282                    io_req->xid);
2283
2284         clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2285
2286         /* Complete so we can finish cleaning up the I/O */
2287         complete(&io_req->cleanup_done);
2288 }
2289
2290 static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
2291         uint8_t tm_flags)
2292 {
2293         struct qedf_ioreq *io_req;
2294         struct fcoe_task_context *task;
2295         struct qedf_ctx *qedf = fcport->qedf;
2296         struct fc_lport *lport = qedf->lport;
2297         int rc = 0;
2298         uint16_t xid;
2299         int tmo = 0;
2300         int lun = 0;
2301         unsigned long flags;
2302         struct fcoe_wqe *sqe;
2303         u16 sqe_idx;
2304
2305         if (!sc_cmd) {
2306                 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd is NULL\n");
2307                 return FAILED;
2308         }
2309
2310         lun = (int)sc_cmd->device->lun;
2311         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2312                 QEDF_ERR(&(qedf->dbg_ctx), "fcport not offloaded\n");
2313                 rc = FAILED;
2314                 goto no_flush;
2315         }
2316
2317         io_req = qedf_alloc_cmd(fcport, QEDF_TASK_MGMT_CMD);
2318         if (!io_req) {
2319                 QEDF_ERR(&(qedf->dbg_ctx), "Failed TMF");
2320                 rc = -EAGAIN;
2321                 goto no_flush;
2322         }
2323
2324         if (tm_flags == FCP_TMF_LUN_RESET)
2325                 qedf->lun_resets++;
2326         else if (tm_flags == FCP_TMF_TGT_RESET)
2327                 qedf->target_resets++;
2328
2329         /* Initialize rest of io_req fields */
2330         io_req->sc_cmd = sc_cmd;
2331         io_req->fcport = fcport;
2332         io_req->cmd_type = QEDF_TASK_MGMT_CMD;
2333
2334         /* Record which cpu this request is associated with */
2335         io_req->cpu = smp_processor_id();
2336
2337         /* Set TM flags */
2338         io_req->io_req_flags = QEDF_READ;
2339         io_req->data_xfer_len = 0;
2340         io_req->tm_flags = tm_flags;
2341
2342         /* Default is to return a SCSI command when an error occurs */
2343         io_req->return_scsi_cmd_on_abts = false;
2344
2345         /* Obtain exchange id */
2346         xid = io_req->xid;
2347
2348         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "TMF io_req xid = "
2349                    "0x%x\n", xid);
2350
2351         /* Initialize task context for this IO request */
2352         task = qedf_get_task_mem(&qedf->tasks, xid);
2353
2354         init_completion(&io_req->tm_done);
2355
2356         spin_lock_irqsave(&fcport->rport_lock, flags);
2357
2358         sqe_idx = qedf_get_sqe_idx(fcport);
2359         sqe = &fcport->sq[sqe_idx];
2360         memset(sqe, 0, sizeof(struct fcoe_wqe));
2361
2362         qedf_init_task(fcport, lport, io_req, task, sqe);
2363         qedf_ring_doorbell(fcport);
2364
2365         spin_unlock_irqrestore(&fcport->rport_lock, flags);
2366
2367         set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2368         tmo = wait_for_completion_timeout(&io_req->tm_done,
2369             QEDF_TM_TIMEOUT * HZ);
2370
2371         if (!tmo) {
2372                 rc = FAILED;
2373                 QEDF_ERR(&(qedf->dbg_ctx), "wait for tm_cmpl timeout!\n");
2374                 /* Clear outstanding bit since command timed out */
2375                 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2376                 io_req->sc_cmd = NULL;
2377         } else {
2378                 /* Check TMF response code */
2379                 if (io_req->fcp_rsp_code == 0)
2380                         rc = SUCCESS;
2381                 else
2382                         rc = FAILED;
2383         }
2384         /*
2385          * Double check that fcport has not gone into an uploading state before
2386          * executing the command flush for the LUN/target.
2387          */
2388         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2389                 QEDF_ERR(&qedf->dbg_ctx,
2390                          "fcport is uploading, not executing flush.\n");
2391                 goto no_flush;
2392         }
2393         /* We do not need this io_req any more */
2394         kref_put(&io_req->refcount, qedf_release_cmd);
2395
2396
2397         if (tm_flags == FCP_TMF_LUN_RESET)
2398                 qedf_flush_active_ios(fcport, lun);
2399         else
2400                 qedf_flush_active_ios(fcport, -1);
2401
2402 no_flush:
2403         if (rc != SUCCESS) {
2404                 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command failed...\n");
2405                 rc = FAILED;
2406         } else {
2407                 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command success...\n");
2408                 rc = SUCCESS;
2409         }
2410         return rc;
2411 }
2412
2413 int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
2414 {
2415         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2416         struct fc_rport_libfc_priv *rp = rport->dd_data;
2417         struct qedf_rport *fcport = (struct qedf_rport *)&rp[1];
2418         struct qedf_ctx *qedf;
2419         struct fc_lport *lport = shost_priv(sc_cmd->device->host);
2420         int rc = SUCCESS;
2421         int rval;
2422         struct qedf_ioreq *io_req = NULL;
2423         int ref_cnt = 0;
2424         struct fc_rport_priv *rdata = fcport->rdata;
2425
2426         QEDF_ERR(NULL,
2427                  "tm_flags 0x%x sc_cmd %p op = 0x%02x target_id = 0x%x lun=%d\n",
2428                  tm_flags, sc_cmd, sc_cmd->cmd_len ? sc_cmd->cmnd[0] : 0xff,
2429                  rport->scsi_target_id, (int)sc_cmd->device->lun);
2430
2431         if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
2432                 QEDF_ERR(NULL, "stale rport\n");
2433                 return FAILED;
2434         }
2435
2436         QEDF_ERR(NULL, "portid=%06x tm_flags =%s\n", rdata->ids.port_id,
2437                  (tm_flags == FCP_TMF_TGT_RESET) ? "TARGET RESET" :
2438                  "LUN RESET");
2439
2440         if (qedf_priv(sc_cmd)->io_req) {
2441                 io_req = qedf_priv(sc_cmd)->io_req;
2442                 ref_cnt = kref_read(&io_req->refcount);
2443                 QEDF_ERR(NULL,
2444                          "orig io_req = %p xid = 0x%x ref_cnt = %d.\n",
2445                          io_req, io_req->xid, ref_cnt);
2446         }
2447
2448         rval = fc_remote_port_chkready(rport);
2449         if (rval) {
2450                 QEDF_ERR(NULL, "device_reset rport not ready\n");
2451                 rc = FAILED;
2452                 goto tmf_err;
2453         }
2454
2455         rc = fc_block_scsi_eh(sc_cmd);
2456         if (rc)
2457                 goto tmf_err;
2458
2459         if (!fcport) {
2460                 QEDF_ERR(NULL, "device_reset: rport is NULL\n");
2461                 rc = FAILED;
2462                 goto tmf_err;
2463         }
2464
2465         qedf = fcport->qedf;
2466
2467         if (!qedf) {
2468                 QEDF_ERR(NULL, "qedf is NULL.\n");
2469                 rc = FAILED;
2470                 goto tmf_err;
2471         }
2472
2473         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2474                 QEDF_ERR(&qedf->dbg_ctx, "Connection is getting uploaded.\n");
2475                 rc = SUCCESS;
2476                 goto tmf_err;
2477         }
2478
2479         if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
2480             test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
2481                 rc = SUCCESS;
2482                 goto tmf_err;
2483         }
2484
2485         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
2486                 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
2487                 rc = FAILED;
2488                 goto tmf_err;
2489         }
2490
2491         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2492                 if (!fcport->rdata)
2493                         QEDF_ERR(&qedf->dbg_ctx, "fcport %p is uploading.\n",
2494                                  fcport);
2495                 else
2496                         QEDF_ERR(&qedf->dbg_ctx,
2497                                  "fcport %p port_id=%06x is uploading.\n",
2498                                  fcport, fcport->rdata->ids.port_id);
2499                 rc = FAILED;
2500                 goto tmf_err;
2501         }
2502
2503         rc = qedf_execute_tmf(fcport, sc_cmd, tm_flags);
2504
2505 tmf_err:
2506         kref_put(&rdata->kref, fc_rport_destroy);
2507         return rc;
2508 }
2509
2510 void qedf_process_tmf_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2511         struct qedf_ioreq *io_req)
2512 {
2513         struct fcoe_cqe_rsp_info *fcp_rsp;
2514
2515         clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2516
2517         fcp_rsp = &cqe->cqe_info.rsp_info;
2518         qedf_parse_fcp_rsp(io_req, fcp_rsp);
2519
2520         io_req->sc_cmd = NULL;
2521         complete(&io_req->tm_done);
2522 }
2523
2524 void qedf_process_unsol_compl(struct qedf_ctx *qedf, uint16_t que_idx,
2525         struct fcoe_cqe *cqe)
2526 {
2527         unsigned long flags;
2528         uint16_t pktlen = cqe->cqe_info.unsolic_info.pkt_len;
2529         u32 payload_len, crc;
2530         struct fc_frame_header *fh;
2531         struct fc_frame *fp;
2532         struct qedf_io_work *io_work;
2533         u32 bdq_idx;
2534         void *bdq_addr;
2535         struct scsi_bd *p_bd_info;
2536
2537         p_bd_info = &cqe->cqe_info.unsolic_info.bd_info;
2538         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2539                   "address.hi=%x, address.lo=%x, opaque_data.hi=%x, opaque_data.lo=%x, bdq_prod_idx=%u, len=%u\n",
2540                   le32_to_cpu(p_bd_info->address.hi),
2541                   le32_to_cpu(p_bd_info->address.lo),
2542                   le32_to_cpu(p_bd_info->opaque.fcoe_opaque.hi),
2543                   le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo),
2544                   qedf->bdq_prod_idx, pktlen);
2545
2546         bdq_idx = le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo);
2547         if (bdq_idx >= QEDF_BDQ_SIZE) {
2548                 QEDF_ERR(&(qedf->dbg_ctx), "bdq_idx is out of range %d.\n",
2549                     bdq_idx);
2550                 goto increment_prod;
2551         }
2552
2553         bdq_addr = qedf->bdq[bdq_idx].buf_addr;
2554         if (!bdq_addr) {
2555                 QEDF_ERR(&(qedf->dbg_ctx), "bdq_addr is NULL, dropping "
2556                     "unsolicited packet.\n");
2557                 goto increment_prod;
2558         }
2559
2560         if (qedf_dump_frames) {
2561                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2562                     "BDQ frame is at addr=%p.\n", bdq_addr);
2563                 print_hex_dump(KERN_WARNING, "bdq ", DUMP_PREFIX_OFFSET, 16, 1,
2564                     (void *)bdq_addr, pktlen, false);
2565         }
2566
2567         /* Allocate frame */
2568         payload_len = pktlen - sizeof(struct fc_frame_header);
2569         fp = fc_frame_alloc(qedf->lport, payload_len);
2570         if (!fp) {
2571                 QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate fp.\n");
2572                 goto increment_prod;
2573         }
2574
2575         /* Copy data from BDQ buffer into fc_frame struct */
2576         fh = (struct fc_frame_header *)fc_frame_header_get(fp);
2577         memcpy(fh, (void *)bdq_addr, pktlen);
2578
2579         QEDF_WARN(&qedf->dbg_ctx,
2580                   "Processing Unsolicated frame, src=%06x dest=%06x r_ctl=0x%x type=0x%x cmd=%02x\n",
2581                   ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id), fh->fh_r_ctl,
2582                   fh->fh_type, fc_frame_payload_op(fp));
2583
2584         /* Initialize the frame so libfc sees it as a valid frame */
2585         crc = fcoe_fc_crc(fp);
2586         fc_frame_init(fp);
2587         fr_dev(fp) = qedf->lport;
2588         fr_sof(fp) = FC_SOF_I3;
2589         fr_eof(fp) = FC_EOF_T;
2590         fr_crc(fp) = cpu_to_le32(~crc);
2591
2592         /*
2593          * We need to return the frame back up to libfc in a non-atomic
2594          * context
2595          */
2596         io_work = mempool_alloc(qedf->io_mempool, GFP_ATOMIC);
2597         if (!io_work) {
2598                 QEDF_WARN(&(qedf->dbg_ctx), "Could not allocate "
2599                            "work for I/O completion.\n");
2600                 fc_frame_free(fp);
2601                 goto increment_prod;
2602         }
2603         memset(io_work, 0, sizeof(struct qedf_io_work));
2604
2605         INIT_WORK(&io_work->work, qedf_fp_io_handler);
2606
2607         /* Copy contents of CQE for deferred processing */
2608         memcpy(&io_work->cqe, cqe, sizeof(struct fcoe_cqe));
2609
2610         io_work->qedf = qedf;
2611         io_work->fp = fp;
2612
2613         queue_work_on(smp_processor_id(), qedf_io_wq, &io_work->work);
2614 increment_prod:
2615         spin_lock_irqsave(&qedf->hba_lock, flags);
2616
2617         /* Increment producer to let f/w know we've handled the frame */
2618         qedf->bdq_prod_idx++;
2619
2620         /* Producer index wraps at uint16_t boundary */
2621         if (qedf->bdq_prod_idx == 0xffff)
2622                 qedf->bdq_prod_idx = 0;
2623
2624         writew(qedf->bdq_prod_idx, qedf->bdq_primary_prod);
2625         readw(qedf->bdq_primary_prod);
2626         writew(qedf->bdq_prod_idx, qedf->bdq_secondary_prod);
2627         readw(qedf->bdq_secondary_prod);
2628
2629         spin_unlock_irqrestore(&qedf->hba_lock, flags);
2630 }