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 e4_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 e4_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 e4_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 e4_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         uint8_t op;
 808
 809         spin_lock_irqsave(&qedf->io_trace_lock, flags);
 810
 811         io_log = &qedf->io_trace_buf[qedf->io_trace_idx];
 812         io_log->direction = direction;
 813         io_log->task_id = io_req->xid;
 814         io_log->port_id = fcport->rdata->ids.port_id;
 815         io_log->lun = sc_cmd->device->lun;
 816         io_log->op = op = sc_cmd->cmnd[0];
 817         io_log->lba[0] = sc_cmd->cmnd[2];
 818         io_log->lba[1] = sc_cmd->cmnd[3];
 819         io_log->lba[2] = sc_cmd->cmnd[4];
 820         io_log->lba[3] = sc_cmd->cmnd[5];
 821         io_log->bufflen = scsi_bufflen(sc_cmd);
 822         io_log->sg_count = scsi_sg_count(sc_cmd);
 823         io_log->result = sc_cmd->result;
 824         io_log->jiffies = jiffies;
 825         io_log->refcount = kref_read(&io_req->refcount);
 826
 827         if (direction == QEDF_IO_TRACE_REQ) {
 828                 /* For requests we only care abot the submission CPU */
 829                 io_log->req_cpu = io_req->cpu;
 830                 io_log->int_cpu = 0;
 831                 io_log->rsp_cpu = 0;
 832         } else if (direction == QEDF_IO_TRACE_RSP) {
 833                 io_log->req_cpu = io_req->cpu;
 834                 io_log->int_cpu = io_req->int_cpu;
 835                 io_log->rsp_cpu = smp_processor_id();
 836         }
 837
 838         io_log->sge_type = io_req->sge_type;
 839
 840         qedf->io_trace_idx++;
 841         if (qedf->io_trace_idx == QEDF_IO_TRACE_SIZE)
 842                 qedf->io_trace_idx = 0;
 843
 844         spin_unlock_irqrestore(&qedf->io_trace_lock, flags);
 845 }
 846
 847 int qedf_post_io_req(struct qedf_rport *fcport, struct qedf_ioreq *io_req)
 848 {
 849         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
 850         struct Scsi_Host *host = sc_cmd->device->host;
 851         struct fc_lport *lport = shost_priv(host);
 852         struct qedf_ctx *qedf = lport_priv(lport);
 853         struct e4_fcoe_task_context *task_ctx;
 854         u16 xid;
 855         struct fcoe_wqe *sqe;
 856         u16 sqe_idx;
 857
 858         /* Initialize rest of io_req fileds */
 859         io_req->data_xfer_len = scsi_bufflen(sc_cmd);
 860         sc_cmd->SCp.ptr = (char *)io_req;
 861         io_req->sge_type = QEDF_IOREQ_FAST_SGE; /* Assume fast SGL by default */
 862
 863         /* Record which cpu this request is associated with */
 864         io_req->cpu = smp_processor_id();
 865
 866         if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
 867                 io_req->io_req_flags = QEDF_READ;
 868                 qedf->input_requests++;
 869         } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
 870                 io_req->io_req_flags = QEDF_WRITE;
 871                 qedf->output_requests++;
 872         } else {
 873                 io_req->io_req_flags = 0;
 874                 qedf->control_requests++;
 875         }
 876
 877         xid = io_req->xid;
 878
 879         /* Build buffer descriptor list for firmware from sg list */
 880         if (qedf_build_bd_list_from_sg(io_req)) {
 881                 QEDF_ERR(&(qedf->dbg_ctx), "BD list creation failed.\n");
 882                 /* Release cmd will release io_req, but sc_cmd is assigned */
 883                 io_req->sc_cmd = NULL;
 884                 kref_put(&io_req->refcount, qedf_release_cmd);
 885                 return -EAGAIN;
 886         }
 887
 888         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
 889             test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
 890                 QEDF_ERR(&(qedf->dbg_ctx), "Session not offloaded yet.\n");
 891                 /* Release cmd will release io_req, but sc_cmd is assigned */
 892                 io_req->sc_cmd = NULL;
 893                 kref_put(&io_req->refcount, qedf_release_cmd);
 894                 return -EINVAL;
 895         }
 896
 897         /* Record LUN number for later use if we neeed them */
 898         io_req->lun = (int)sc_cmd->device->lun;
 899
 900         /* Obtain free SQE */
 901         sqe_idx = qedf_get_sqe_idx(fcport);
 902         sqe = &fcport->sq[sqe_idx];
 903         memset(sqe, 0, sizeof(struct fcoe_wqe));
 904
 905         /* Get the task context */
 906         task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
 907         if (!task_ctx) {
 908                 QEDF_WARN(&(qedf->dbg_ctx), "task_ctx is NULL, xid=%d.\n",
 909                            xid);
 910                 /* Release cmd will release io_req, but sc_cmd is assigned */
 911                 io_req->sc_cmd = NULL;
 912                 kref_put(&io_req->refcount, qedf_release_cmd);
 913                 return -EINVAL;
 914         }
 915
 916         qedf_init_task(fcport, lport, io_req, task_ctx, sqe);
 917
 918         /* Ring doorbell */
 919         qedf_ring_doorbell(fcport);
 920
 921         /* Set that command is with the firmware now */
 922         set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
 923
 924         if (qedf_io_tracing && io_req->sc_cmd)
 925                 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_REQ);
 926
 927         return false;
 928 }
 929
 930 int
 931 qedf_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc_cmd)
 932 {
 933         struct fc_lport *lport = shost_priv(host);
 934         struct qedf_ctx *qedf = lport_priv(lport);
 935         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
 936         struct fc_rport_libfc_priv *rp = rport->dd_data;
 937         struct qedf_rport *fcport;
 938         struct qedf_ioreq *io_req;
 939         int rc = 0;
 940         int rval;
 941         unsigned long flags = 0;
 942         int num_sgs = 0;
 943
 944         num_sgs = scsi_sg_count(sc_cmd);
 945         if (scsi_sg_count(sc_cmd) > QEDF_MAX_BDS_PER_CMD) {
 946                 QEDF_ERR(&qedf->dbg_ctx,
 947                          "Number of SG elements %d exceeds what hardware limitation of %d.\n",
 948                          num_sgs, QEDF_MAX_BDS_PER_CMD);
 949                 sc_cmd->result = DID_ERROR;
 950                 sc_cmd->scsi_done(sc_cmd);
 951                 return 0;
 952         }
 953
 954         if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
 955             test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
 956                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
 957                           "Returning DNC as unloading or stop io, flags 0x%lx.\n",
 958                           qedf->flags);
 959                 sc_cmd->result = DID_NO_CONNECT << 16;
 960                 sc_cmd->scsi_done(sc_cmd);
 961                 return 0;
 962         }
 963
 964         if (!qedf->pdev->msix_enabled) {
 965                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
 966                     "Completing sc_cmd=%p DID_NO_CONNECT as MSI-X is not enabled.\n",
 967                     sc_cmd);
 968                 sc_cmd->result = DID_NO_CONNECT << 16;
 969                 sc_cmd->scsi_done(sc_cmd);
 970                 return 0;
 971         }
 972
 973         rval = fc_remote_port_chkready(rport);
 974         if (rval) {
 975                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
 976                           "fc_remote_port_chkready failed=0x%x for port_id=0x%06x.\n",
 977                           rval, rport->port_id);
 978                 sc_cmd->result = rval;
 979                 sc_cmd->scsi_done(sc_cmd);
 980                 return 0;
 981         }
 982
 983         /* Retry command if we are doing a qed drain operation */
 984         if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
 985                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Drain active.\n");
 986                 rc = SCSI_MLQUEUE_HOST_BUSY;
 987                 goto exit_qcmd;
 988         }
 989
 990         if (lport->state != LPORT_ST_READY ||
 991             atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
 992                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Link down.\n");
 993                 rc = SCSI_MLQUEUE_HOST_BUSY;
 994                 goto exit_qcmd;
 995         }
 996
 997         /* rport and tgt are allocated together, so tgt should be non-NULL */
 998         fcport = (struct qedf_rport *)&rp[1];
 999
1000         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags) ||
1001             test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1002                 /*
1003                  * Session is not offloaded yet. Let SCSI-ml retry
1004                  * the command.
1005                  */
1006                 rc = SCSI_MLQUEUE_TARGET_BUSY;
1007                 goto exit_qcmd;
1008         }
1009
1010         atomic_inc(&fcport->ios_to_queue);
1011
1012         if (fcport->retry_delay_timestamp) {
1013                 /* Take fcport->rport_lock for resetting the delay_timestamp */
1014                 spin_lock_irqsave(&fcport->rport_lock, flags);
1015                 if (time_after(jiffies, fcport->retry_delay_timestamp)) {
1016                         fcport->retry_delay_timestamp = 0;
1017                 } else {
1018                         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1019                         /* If retry_delay timer is active, flow off the ML */
1020                         rc = SCSI_MLQUEUE_TARGET_BUSY;
1021                         atomic_dec(&fcport->ios_to_queue);
1022                         goto exit_qcmd;
1023                 }
1024                 spin_unlock_irqrestore(&fcport->rport_lock, flags);
1025         }
1026
1027         io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
1028         if (!io_req) {
1029                 rc = SCSI_MLQUEUE_HOST_BUSY;
1030                 atomic_dec(&fcport->ios_to_queue);
1031                 goto exit_qcmd;
1032         }
1033
1034         io_req->sc_cmd = sc_cmd;
1035
1036         /* Take fcport->rport_lock for posting to fcport send queue */
1037         spin_lock_irqsave(&fcport->rport_lock, flags);
1038         if (qedf_post_io_req(fcport, io_req)) {
1039                 QEDF_WARN(&(qedf->dbg_ctx), "Unable to post io_req\n");
1040                 /* Return SQE to pool */
1041                 atomic_inc(&fcport->free_sqes);
1042                 rc = SCSI_MLQUEUE_HOST_BUSY;
1043         }
1044         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1045         atomic_dec(&fcport->ios_to_queue);
1046
1047 exit_qcmd:
1048         return rc;
1049 }
1050
1051 static void qedf_parse_fcp_rsp(struct qedf_ioreq *io_req,
1052                                  struct fcoe_cqe_rsp_info *fcp_rsp)
1053 {
1054         struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1055         struct qedf_ctx *qedf = io_req->fcport->qedf;
1056         u8 rsp_flags = fcp_rsp->rsp_flags.flags;
1057         int fcp_sns_len = 0;
1058         int fcp_rsp_len = 0;
1059         uint8_t *rsp_info, *sense_data;
1060
1061         io_req->fcp_status = FC_GOOD;
1062         io_req->fcp_resid = 0;
1063         if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1064             FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1065                 io_req->fcp_resid = fcp_rsp->fcp_resid;
1066
1067         io_req->scsi_comp_flags = rsp_flags;
1068         CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1069             fcp_rsp->scsi_status_code;
1070
1071         if (rsp_flags &
1072             FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID)
1073                 fcp_rsp_len = fcp_rsp->fcp_rsp_len;
1074
1075         if (rsp_flags &
1076             FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID)
1077                 fcp_sns_len = fcp_rsp->fcp_sns_len;
1078
1079         io_req->fcp_rsp_len = fcp_rsp_len;
1080         io_req->fcp_sns_len = fcp_sns_len;
1081         rsp_info = sense_data = io_req->sense_buffer;
1082
1083         /* fetch fcp_rsp_code */
1084         if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1085                 /* Only for task management function */
1086                 io_req->fcp_rsp_code = rsp_info[3];
1087                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1088                     "fcp_rsp_code = %d\n", io_req->fcp_rsp_code);
1089                 /* Adjust sense-data location. */
1090                 sense_data += fcp_rsp_len;
1091         }
1092
1093         if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1094                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1095                     "Truncating sense buffer\n");
1096                 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1097         }
1098
1099         /* The sense buffer can be NULL for TMF commands */
1100         if (sc_cmd->sense_buffer) {
1101                 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1102                 if (fcp_sns_len)
1103                         memcpy(sc_cmd->sense_buffer, sense_data,
1104                             fcp_sns_len);
1105         }
1106 }
1107
1108 static void qedf_unmap_sg_list(struct qedf_ctx *qedf, struct qedf_ioreq *io_req)
1109 {
1110         struct scsi_cmnd *sc = io_req->sc_cmd;
1111
1112         if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1113                 dma_unmap_sg(&qedf->pdev->dev, scsi_sglist(sc),
1114                     scsi_sg_count(sc), sc->sc_data_direction);
1115                 io_req->bd_tbl->bd_valid = 0;
1116         }
1117 }
1118
1119 void qedf_scsi_completion(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1120         struct qedf_ioreq *io_req)
1121 {
1122         struct scsi_cmnd *sc_cmd;
1123         struct fcoe_cqe_rsp_info *fcp_rsp;
1124         struct qedf_rport *fcport;
1125         int refcount;
1126         u16 scope, qualifier = 0;
1127         u8 fw_residual_flag = 0;
1128         unsigned long flags = 0;
1129         u16 chk_scope = 0;
1130
1131         if (!io_req)
1132                 return;
1133         if (!cqe)
1134                 return;
1135
1136         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1137             test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1138             test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1139                 QEDF_ERR(&qedf->dbg_ctx,
1140                          "io_req xid=0x%x already in cleanup or abort processing or already completed.\n",
1141                          io_req->xid);
1142                 return;
1143         }
1144
1145         sc_cmd = io_req->sc_cmd;
1146         fcp_rsp = &cqe->cqe_info.rsp_info;
1147
1148         if (!sc_cmd) {
1149                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1150                 return;
1151         }
1152
1153         if (!sc_cmd->SCp.ptr) {
1154                 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1155                     "another context.\n");
1156                 return;
1157         }
1158
1159         if (!sc_cmd->device) {
1160                 QEDF_ERR(&qedf->dbg_ctx,
1161                          "Device for sc_cmd %p is NULL.\n", sc_cmd);
1162                 return;
1163         }
1164
1165         if (!sc_cmd->request) {
1166                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd->request is NULL, "
1167                     "sc_cmd=%p.\n", sc_cmd);
1168                 return;
1169         }
1170
1171         if (!sc_cmd->request->q) {
1172                 QEDF_WARN(&(qedf->dbg_ctx), "request->q is NULL so request "
1173                    "is not valid, sc_cmd=%p.\n", sc_cmd);
1174                 return;
1175         }
1176
1177         fcport = io_req->fcport;
1178
1179         /*
1180          * When flush is active, let the cmds be completed from the cleanup
1181          * context
1182          */
1183         if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1184             (test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags) &&
1185              sc_cmd->device->lun == (u64)fcport->lun_reset_lun)) {
1186                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1187                           "Dropping good completion xid=0x%x as fcport is flushing",
1188                           io_req->xid);
1189                 return;
1190         }
1191
1192         qedf_parse_fcp_rsp(io_req, fcp_rsp);
1193
1194         qedf_unmap_sg_list(qedf, io_req);
1195
1196         /* Check for FCP transport error */
1197         if (io_req->fcp_rsp_len > 3 && io_req->fcp_rsp_code) {
1198                 QEDF_ERR(&(qedf->dbg_ctx),
1199                     "FCP I/O protocol failure xid=0x%x fcp_rsp_len=%d "
1200                     "fcp_rsp_code=%d.\n", io_req->xid, io_req->fcp_rsp_len,
1201                     io_req->fcp_rsp_code);
1202                 sc_cmd->result = DID_BUS_BUSY << 16;
1203                 goto out;
1204         }
1205
1206         fw_residual_flag = GET_FIELD(cqe->cqe_info.rsp_info.fw_error_flags,
1207             FCOE_CQE_RSP_INFO_FW_UNDERRUN);
1208         if (fw_residual_flag) {
1209                 QEDF_ERR(&qedf->dbg_ctx,
1210                          "Firmware detected underrun: xid=0x%x fcp_rsp.flags=0x%02x fcp_resid=%d fw_residual=0x%x lba=%02x%02x%02x%02x.\n",
1211                          io_req->xid, fcp_rsp->rsp_flags.flags,
1212                          io_req->fcp_resid,
1213                          cqe->cqe_info.rsp_info.fw_residual, sc_cmd->cmnd[2],
1214                          sc_cmd->cmnd[3], sc_cmd->cmnd[4], sc_cmd->cmnd[5]);
1215
1216                 if (io_req->cdb_status == 0)
1217                         sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
1218                 else
1219                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1220
1221                 /*
1222                  * Set resid to the whole buffer length so we won't try to resue
1223                  * any previously data.
1224                  */
1225                 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1226                 goto out;
1227         }
1228
1229         switch (io_req->fcp_status) {
1230         case FC_GOOD:
1231                 if (io_req->cdb_status == 0) {
1232                         /* Good I/O completion */
1233                         sc_cmd->result = DID_OK << 16;
1234                 } else {
1235                         refcount = kref_read(&io_req->refcount);
1236                         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1237                             "%d:0:%d:%lld xid=0x%0x op=0x%02x "
1238                             "lba=%02x%02x%02x%02x cdb_status=%d "
1239                             "fcp_resid=0x%x refcount=%d.\n",
1240                             qedf->lport->host->host_no, sc_cmd->device->id,
1241                             sc_cmd->device->lun, io_req->xid,
1242                             sc_cmd->cmnd[0], sc_cmd->cmnd[2], sc_cmd->cmnd[3],
1243                             sc_cmd->cmnd[4], sc_cmd->cmnd[5],
1244                             io_req->cdb_status, io_req->fcp_resid,
1245                             refcount);
1246                         sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1247
1248                         if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1249                             io_req->cdb_status == SAM_STAT_BUSY) {
1250                                 /*
1251                                  * Check whether we need to set retry_delay at
1252                                  * all based on retry_delay module parameter
1253                                  * and the status qualifier.
1254                                  */
1255
1256                                 /* Upper 2 bits */
1257                                 scope = fcp_rsp->retry_delay_timer & 0xC000;
1258                                 /* Lower 14 bits */
1259                                 qualifier = fcp_rsp->retry_delay_timer & 0x3FFF;
1260
1261                                 if (qedf_retry_delay)
1262                                         chk_scope = 1;
1263                                 /* Record stats */
1264                                 if (io_req->cdb_status ==
1265                                     SAM_STAT_TASK_SET_FULL)
1266                                         qedf->task_set_fulls++;
1267                                 else
1268                                         qedf->busy++;
1269                         }
1270                 }
1271                 if (io_req->fcp_resid)
1272                         scsi_set_resid(sc_cmd, io_req->fcp_resid);
1273
1274                 if (chk_scope == 1) {
1275                         if ((scope == 1 || scope == 2) &&
1276                             (qualifier > 0 && qualifier <= 0x3FEF)) {
1277                                 /* Check we don't go over the max */
1278                                 if (qualifier > QEDF_RETRY_DELAY_MAX) {
1279                                         qualifier = QEDF_RETRY_DELAY_MAX;
1280                                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1281                                                   "qualifier = %d\n",
1282                                                   (fcp_rsp->retry_delay_timer &
1283                                                   0x3FFF));
1284                                 }
1285                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1286                                           "Scope = %d and qualifier = %d",
1287                                           scope, qualifier);
1288                                 /*  Take fcport->rport_lock to
1289                                  *  update the retry_delay_timestamp
1290                                  */
1291                                 spin_lock_irqsave(&fcport->rport_lock, flags);
1292                                 fcport->retry_delay_timestamp =
1293                                         jiffies + (qualifier * HZ / 10);
1294                                 spin_unlock_irqrestore(&fcport->rport_lock,
1295                                                        flags);
1296
1297                         } else {
1298                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1299                                           "combination of scope = %d and qualifier = %d is not handled in qedf.\n",
1300                                           scope, qualifier);
1301                         }
1302                 }
1303                 break;
1304         default:
1305                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "fcp_status=%d.\n",
1306                            io_req->fcp_status);
1307                 break;
1308         }
1309
1310 out:
1311         if (qedf_io_tracing)
1312                 qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_RSP);
1313
1314         /*
1315          * We wait till the end of the function to clear the
1316          * outstanding bit in case we need to send an abort
1317          */
1318         clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1319
1320         io_req->sc_cmd = NULL;
1321         sc_cmd->SCp.ptr =  NULL;
1322         sc_cmd->scsi_done(sc_cmd);
1323         kref_put(&io_req->refcount, qedf_release_cmd);
1324 }
1325
1326 /* Return a SCSI command in some other context besides a normal completion */
1327 void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
1328         int result)
1329 {
1330         struct scsi_cmnd *sc_cmd;
1331         int refcount;
1332
1333         if (!io_req) {
1334                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "io_req is NULL\n");
1335                 return;
1336         }
1337
1338         if (test_and_set_bit(QEDF_CMD_ERR_SCSI_DONE, &io_req->flags)) {
1339                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1340                           "io_req:%p scsi_done handling already done\n",
1341                           io_req);
1342                 return;
1343         }
1344
1345         /*
1346          * We will be done with this command after this call so clear the
1347          * outstanding bit.
1348          */
1349         clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
1350
1351         sc_cmd = io_req->sc_cmd;
1352
1353         if (!sc_cmd) {
1354                 QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
1355                 return;
1356         }
1357
1358         if (!virt_addr_valid(sc_cmd)) {
1359                 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd=%p is not valid.", sc_cmd);
1360                 goto bad_scsi_ptr;
1361         }
1362
1363         if (!sc_cmd->SCp.ptr) {
1364                 QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
1365                     "another context.\n");
1366                 return;
1367         }
1368
1369         if (!sc_cmd->device) {
1370                 QEDF_ERR(&qedf->dbg_ctx, "Device for sc_cmd %p is NULL.\n",
1371                          sc_cmd);
1372                 goto bad_scsi_ptr;
1373         }
1374
1375         if (!virt_addr_valid(sc_cmd->device)) {
1376                 QEDF_ERR(&qedf->dbg_ctx,
1377                          "Device pointer for sc_cmd %p is bad.\n", sc_cmd);
1378                 goto bad_scsi_ptr;
1379         }
1380
1381         if (!sc_cmd->sense_buffer) {
1382                 QEDF_ERR(&qedf->dbg_ctx,
1383                          "sc_cmd->sense_buffer for sc_cmd %p is NULL.\n",
1384                          sc_cmd);
1385                 goto bad_scsi_ptr;
1386         }
1387
1388         if (!virt_addr_valid(sc_cmd->sense_buffer)) {
1389                 QEDF_ERR(&qedf->dbg_ctx,
1390                          "sc_cmd->sense_buffer for sc_cmd %p is bad.\n",
1391                          sc_cmd);
1392                 goto bad_scsi_ptr;
1393         }
1394
1395         if (!sc_cmd->scsi_done) {
1396                 QEDF_ERR(&qedf->dbg_ctx,
1397                          "sc_cmd->scsi_done for sc_cmd %p is NULL.\n",
1398                          sc_cmd);
1399                 goto bad_scsi_ptr;
1400         }
1401
1402         qedf_unmap_sg_list(qedf, io_req);
1403
1404         sc_cmd->result = result << 16;
1405         refcount = kref_read(&io_req->refcount);
1406         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "%d:0:%d:%lld: Completing "
1407             "sc_cmd=%p result=0x%08x op=0x%02x lba=0x%02x%02x%02x%02x, "
1408             "allowed=%d retries=%d refcount=%d.\n",
1409             qedf->lport->host->host_no, sc_cmd->device->id,
1410             sc_cmd->device->lun, sc_cmd, sc_cmd->result, sc_cmd->cmnd[0],
1411             sc_cmd->cmnd[2], sc_cmd->cmnd[3], sc_cmd->cmnd[4],
1412             sc_cmd->cmnd[5], sc_cmd->allowed, sc_cmd->retries,
1413             refcount);
1414
1415         /*
1416          * Set resid to the whole buffer length so we won't try to resue any
1417          * previously read data
1418          */
1419         scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
1420
1421         if (qedf_io_tracing)
1422                 qedf_trace_io(io_req->fcport, io_req, QEDF_IO_TRACE_RSP);
1423
1424         io_req->sc_cmd = NULL;
1425         sc_cmd->SCp.ptr = NULL;
1426         sc_cmd->scsi_done(sc_cmd);
1427         kref_put(&io_req->refcount, qedf_release_cmd);
1428         return;
1429
1430 bad_scsi_ptr:
1431         /*
1432          * Clear the io_req->sc_cmd backpointer so we don't try to process
1433          * this again
1434          */
1435         io_req->sc_cmd = NULL;
1436         kref_put(&io_req->refcount, qedf_release_cmd);  /* ID: 001 */
1437 }
1438
1439 /*
1440  * Handle warning type CQE completions. This is mainly used for REC timer
1441  * popping.
1442  */
1443 void qedf_process_warning_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1444         struct qedf_ioreq *io_req)
1445 {
1446         int rval, i;
1447         struct qedf_rport *fcport = io_req->fcport;
1448         u64 err_warn_bit_map;
1449         u8 err_warn = 0xff;
1450
1451         if (!cqe) {
1452                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1453                           "cqe is NULL for io_req %p xid=0x%x\n",
1454                           io_req, io_req->xid);
1455                 return;
1456         }
1457
1458         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Warning CQE, "
1459                   "xid=0x%x\n", io_req->xid);
1460         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1461                   "err_warn_bitmap=%08x:%08x\n",
1462                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1463                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1464         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1465                   "rx_buff_off=%08x, rx_id=%04x\n",
1466                   le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1467                   le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1468                   le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1469
1470         /* Normalize the error bitmap value to an just an unsigned int */
1471         err_warn_bit_map = (u64)
1472             ((u64)cqe->cqe_info.err_info.err_warn_bitmap_hi << 32) |
1473             (u64)cqe->cqe_info.err_info.err_warn_bitmap_lo;
1474         for (i = 0; i < 64; i++) {
1475                 if (err_warn_bit_map & (u64)((u64)1 << i)) {
1476                         err_warn = i;
1477                         break;
1478                 }
1479         }
1480
1481         /* Check if REC TOV expired if this is a tape device */
1482         if (fcport->dev_type == QEDF_RPORT_TYPE_TAPE) {
1483                 if (err_warn ==
1484                     FCOE_WARNING_CODE_REC_TOV_TIMER_EXPIRATION) {
1485                         QEDF_ERR(&(qedf->dbg_ctx), "REC timer expired.\n");
1486                         if (!test_bit(QEDF_CMD_SRR_SENT, &io_req->flags)) {
1487                                 io_req->rx_buf_off =
1488                                     cqe->cqe_info.err_info.rx_buf_off;
1489                                 io_req->tx_buf_off =
1490                                     cqe->cqe_info.err_info.tx_buf_off;
1491                                 io_req->rx_id = cqe->cqe_info.err_info.rx_id;
1492                                 rval = qedf_send_rec(io_req);
1493                                 /*
1494                                  * We only want to abort the io_req if we
1495                                  * can't queue the REC command as we want to
1496                                  * keep the exchange open for recovery.
1497                                  */
1498                                 if (rval)
1499                                         goto send_abort;
1500                         }
1501                         return;
1502                 }
1503         }
1504
1505 send_abort:
1506         init_completion(&io_req->abts_done);
1507         rval = qedf_initiate_abts(io_req, true);
1508         if (rval)
1509                 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1510 }
1511
1512 /* Cleanup a command when we receive an error detection completion */
1513 void qedf_process_error_detect(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1514         struct qedf_ioreq *io_req)
1515 {
1516         int rval;
1517
1518         if (!cqe) {
1519                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1520                           "cqe is NULL for io_req %p\n", io_req);
1521                 return;
1522         }
1523
1524         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Error detection CQE, "
1525                   "xid=0x%x\n", io_req->xid);
1526         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
1527                   "err_warn_bitmap=%08x:%08x\n",
1528                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
1529                   le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
1530         QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
1531                   "rx_buff_off=%08x, rx_id=%04x\n",
1532                   le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
1533                   le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
1534                   le32_to_cpu(cqe->cqe_info.err_info.rx_id));
1535
1536         if (qedf->stop_io_on_error) {
1537                 qedf_stop_all_io(qedf);
1538                 return;
1539         }
1540
1541         init_completion(&io_req->abts_done);
1542         rval = qedf_initiate_abts(io_req, true);
1543         if (rval)
1544                 QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
1545 }
1546
1547 static void qedf_flush_els_req(struct qedf_ctx *qedf,
1548         struct qedf_ioreq *els_req)
1549 {
1550         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1551             "Flushing ELS request xid=0x%x refcount=%d.\n", els_req->xid,
1552             kref_read(&els_req->refcount));
1553
1554         /*
1555          * Need to distinguish this from a timeout when calling the
1556          * els_req->cb_func.
1557          */
1558         els_req->event = QEDF_IOREQ_EV_ELS_FLUSH;
1559
1560         clear_bit(QEDF_CMD_OUTSTANDING, &els_req->flags);
1561
1562         /* Cancel the timer */
1563         cancel_delayed_work_sync(&els_req->timeout_work);
1564
1565         /* Call callback function to complete command */
1566         if (els_req->cb_func && els_req->cb_arg) {
1567                 els_req->cb_func(els_req->cb_arg);
1568                 els_req->cb_arg = NULL;
1569         }
1570
1571         /* Release kref for original initiate_els */
1572         kref_put(&els_req->refcount, qedf_release_cmd);
1573 }
1574
1575 /* A value of -1 for lun is a wild card that means flush all
1576  * active SCSI I/Os for the target.
1577  */
1578 void qedf_flush_active_ios(struct qedf_rport *fcport, int lun)
1579 {
1580         struct qedf_ioreq *io_req;
1581         struct qedf_ctx *qedf;
1582         struct qedf_cmd_mgr *cmd_mgr;
1583         int i, rc;
1584         unsigned long flags;
1585         int flush_cnt = 0;
1586         int wait_cnt = 100;
1587         int refcount = 0;
1588
1589         if (!fcport) {
1590                 QEDF_ERR(NULL, "fcport is NULL\n");
1591                 return;
1592         }
1593
1594         /* Check that fcport is still offloaded */
1595         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1596                 QEDF_ERR(NULL, "fcport is no longer offloaded.\n");
1597                 return;
1598         }
1599
1600         qedf = fcport->qedf;
1601
1602         if (!qedf) {
1603                 QEDF_ERR(NULL, "qedf is NULL.\n");
1604                 return;
1605         }
1606
1607         /* Only wait for all commands to be queued in the Upload context */
1608         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1609             (lun == -1)) {
1610                 while (atomic_read(&fcport->ios_to_queue)) {
1611                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1612                                   "Waiting for %d I/Os to be queued\n",
1613                                   atomic_read(&fcport->ios_to_queue));
1614                         if (wait_cnt == 0) {
1615                                 QEDF_ERR(NULL,
1616                                          "%d IOs request could not be queued\n",
1617                                          atomic_read(&fcport->ios_to_queue));
1618                         }
1619                         msleep(20);
1620                         wait_cnt--;
1621                 }
1622         }
1623
1624         cmd_mgr = qedf->cmd_mgr;
1625
1626         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1627                   "Flush active i/o's num=0x%x fcport=0x%p port_id=0x%06x scsi_id=%d.\n",
1628                   atomic_read(&fcport->num_active_ios), fcport,
1629                   fcport->rdata->ids.port_id, fcport->rport->scsi_target_id);
1630         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Locking flush mutex.\n");
1631
1632         mutex_lock(&qedf->flush_mutex);
1633         if (lun == -1) {
1634                 set_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1635         } else {
1636                 set_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1637                 fcport->lun_reset_lun = lun;
1638         }
1639
1640         for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1641                 io_req = &cmd_mgr->cmds[i];
1642
1643                 if (!io_req)
1644                         continue;
1645                 if (!io_req->fcport)
1646                         continue;
1647
1648                 spin_lock_irqsave(&cmd_mgr->lock, flags);
1649
1650                 if (io_req->alloc) {
1651                         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1652                                 if (io_req->cmd_type == QEDF_SCSI_CMD)
1653                                         QEDF_ERR(&qedf->dbg_ctx,
1654                                                  "Allocated but not queued, xid=0x%x\n",
1655                                                  io_req->xid);
1656                         }
1657                         spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1658                 } else {
1659                         spin_unlock_irqrestore(&cmd_mgr->lock, flags);
1660                         continue;
1661                 }
1662
1663                 if (io_req->fcport != fcport)
1664                         continue;
1665
1666                 /* In case of ABTS, CMD_OUTSTANDING is cleared on ABTS response,
1667                  * but RRQ is still pending.
1668                  * Workaround: Within qedf_send_rrq, we check if the fcport is
1669                  * NULL, and we drop the ref on the io_req to clean it up.
1670                  */
1671                 if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags)) {
1672                         refcount = kref_read(&io_req->refcount);
1673                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1674                                   "Not outstanding, xid=0x%x, cmd_type=%d refcount=%d.\n",
1675                                   io_req->xid, io_req->cmd_type, refcount);
1676                         /* If RRQ work has been queue, try to cancel it and
1677                          * free the io_req
1678                          */
1679                         if (atomic_read(&io_req->state) ==
1680                             QEDFC_CMD_ST_RRQ_WAIT) {
1681                                 if (cancel_delayed_work_sync
1682                                     (&io_req->rrq_work)) {
1683                                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1684                                                   "Putting reference for pending RRQ work xid=0x%x.\n",
1685                                                   io_req->xid);
1686                                         /* ID: 003 */
1687                                         kref_put(&io_req->refcount,
1688                                                  qedf_release_cmd);
1689                                 }
1690                         }
1691                         continue;
1692                 }
1693
1694                 /* Only consider flushing ELS during target reset */
1695                 if (io_req->cmd_type == QEDF_ELS &&
1696                     lun == -1) {
1697                         rc = kref_get_unless_zero(&io_req->refcount);
1698                         if (!rc) {
1699                                 QEDF_ERR(&(qedf->dbg_ctx),
1700                                     "Could not get kref for ELS io_req=0x%p xid=0x%x.\n",
1701                                     io_req, io_req->xid);
1702                                 continue;
1703                         }
1704                         qedf_initiate_cleanup(io_req, false);
1705                         flush_cnt++;
1706                         qedf_flush_els_req(qedf, io_req);
1707
1708                         /*
1709                          * Release the kref and go back to the top of the
1710                          * loop.
1711                          */
1712                         goto free_cmd;
1713                 }
1714
1715                 if (io_req->cmd_type == QEDF_ABTS) {
1716                         /* ID: 004 */
1717                         rc = kref_get_unless_zero(&io_req->refcount);
1718                         if (!rc) {
1719                                 QEDF_ERR(&(qedf->dbg_ctx),
1720                                     "Could not get kref for abort io_req=0x%p xid=0x%x.\n",
1721                                     io_req, io_req->xid);
1722                                 continue;
1723                         }
1724                         if (lun != -1 && io_req->lun != lun)
1725                                 goto free_cmd;
1726
1727                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1728                             "Flushing abort xid=0x%x.\n", io_req->xid);
1729
1730                         if (cancel_delayed_work_sync(&io_req->rrq_work)) {
1731                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1732                                           "Putting ref for cancelled RRQ work xid=0x%x.\n",
1733                                           io_req->xid);
1734                                 kref_put(&io_req->refcount, qedf_release_cmd);
1735                         }
1736
1737                         if (cancel_delayed_work_sync(&io_req->timeout_work)) {
1738                                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1739                                           "Putting ref for cancelled tmo work xid=0x%x.\n",
1740                                           io_req->xid);
1741                                 qedf_initiate_cleanup(io_req, true);
1742                                 /* Notify eh_abort handler that ABTS is
1743                                  * complete
1744                                  */
1745                                 complete(&io_req->abts_done);
1746                                 clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1747                                 /* ID: 002 */
1748                                 kref_put(&io_req->refcount, qedf_release_cmd);
1749                         }
1750                         flush_cnt++;
1751                         goto free_cmd;
1752                 }
1753
1754                 if (!io_req->sc_cmd)
1755                         continue;
1756                 if (!io_req->sc_cmd->device) {
1757                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1758                                   "Device backpointer NULL for sc_cmd=%p.\n",
1759                                   io_req->sc_cmd);
1760                         /* Put reference for non-existent scsi_cmnd */
1761                         io_req->sc_cmd = NULL;
1762                         qedf_initiate_cleanup(io_req, false);
1763                         kref_put(&io_req->refcount, qedf_release_cmd);
1764                         continue;
1765                 }
1766                 if (lun > -1) {
1767                         if (io_req->lun != lun)
1768                                 continue;
1769                 }
1770
1771                 /*
1772                  * Use kref_get_unless_zero in the unlikely case the command
1773                  * we're about to flush was completed in the normal SCSI path
1774                  */
1775                 rc = kref_get_unless_zero(&io_req->refcount);
1776                 if (!rc) {
1777                         QEDF_ERR(&(qedf->dbg_ctx), "Could not get kref for "
1778                             "io_req=0x%p xid=0x%x\n", io_req, io_req->xid);
1779                         continue;
1780                 }
1781
1782                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
1783                     "Cleanup xid=0x%x.\n", io_req->xid);
1784                 flush_cnt++;
1785
1786                 /* Cleanup task and return I/O mid-layer */
1787                 qedf_initiate_cleanup(io_req, true);
1788
1789 free_cmd:
1790                 kref_put(&io_req->refcount, qedf_release_cmd);  /* ID: 004 */
1791         }
1792
1793         wait_cnt = 60;
1794         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1795                   "Flushed 0x%x I/Os, active=0x%x.\n",
1796                   flush_cnt, atomic_read(&fcport->num_active_ios));
1797         /* Only wait for all commands to complete in the Upload context */
1798         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags) &&
1799             (lun == -1)) {
1800                 while (atomic_read(&fcport->num_active_ios)) {
1801                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1802                                   "Flushed 0x%x I/Os, active=0x%x cnt=%d.\n",
1803                                   flush_cnt,
1804                                   atomic_read(&fcport->num_active_ios),
1805                                   wait_cnt);
1806                         if (wait_cnt == 0) {
1807                                 QEDF_ERR(&qedf->dbg_ctx,
1808                                          "Flushed %d I/Os, active=%d.\n",
1809                                          flush_cnt,
1810                                          atomic_read(&fcport->num_active_ios));
1811                                 for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
1812                                         io_req = &cmd_mgr->cmds[i];
1813                                         if (io_req->fcport &&
1814                                             io_req->fcport == fcport) {
1815                                                 refcount =
1816                                                 kref_read(&io_req->refcount);
1817                                                 set_bit(QEDF_CMD_DIRTY,
1818                                                         &io_req->flags);
1819                                                 QEDF_ERR(&qedf->dbg_ctx,
1820                                                          "Outstanding io_req =%p xid=0x%x flags=0x%lx, sc_cmd=%p refcount=%d cmd_type=%d.\n",
1821                                                          io_req, io_req->xid,
1822                                                          io_req->flags,
1823                                                          io_req->sc_cmd,
1824                                                          refcount,
1825                                                          io_req->cmd_type);
1826                                         }
1827                                 }
1828                                 WARN_ON(1);
1829                                 break;
1830                         }
1831                         msleep(500);
1832                         wait_cnt--;
1833                 }
1834         }
1835
1836         clear_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags);
1837         clear_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags);
1838         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO, "Unlocking flush mutex.\n");
1839         mutex_unlock(&qedf->flush_mutex);
1840 }
1841
1842 /*
1843  * Initiate a ABTS middle path command. Note that we don't have to initialize
1844  * the task context for an ABTS task.
1845  */
1846 int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
1847 {
1848         struct fc_lport *lport;
1849         struct qedf_rport *fcport = io_req->fcport;
1850         struct fc_rport_priv *rdata;
1851         struct qedf_ctx *qedf;
1852         u16 xid;
1853         int rc = 0;
1854         unsigned long flags;
1855         struct fcoe_wqe *sqe;
1856         u16 sqe_idx;
1857         int refcount = 0;
1858
1859         /* Sanity check qedf_rport before dereferencing any pointers */
1860         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
1861                 QEDF_ERR(NULL, "tgt not offloaded\n");
1862                 rc = 1;
1863                 goto out;
1864         }
1865
1866         qedf = fcport->qedf;
1867         rdata = fcport->rdata;
1868
1869         if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
1870                 QEDF_ERR(&qedf->dbg_ctx, "stale rport\n");
1871                 rc = 1;
1872                 goto out;
1873         }
1874
1875         lport = qedf->lport;
1876
1877         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
1878                 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
1879                 rc = 1;
1880                 goto drop_rdata_kref;
1881         }
1882
1883         if (atomic_read(&qedf->link_down_tmo_valid) > 0) {
1884                 QEDF_ERR(&(qedf->dbg_ctx), "link_down_tmo active.\n");
1885                 rc = 1;
1886                 goto drop_rdata_kref;
1887         }
1888
1889         /* Ensure room on SQ */
1890         if (!atomic_read(&fcport->free_sqes)) {
1891                 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
1892                 rc = 1;
1893                 goto drop_rdata_kref;
1894         }
1895
1896         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
1897                 QEDF_ERR(&qedf->dbg_ctx, "fcport is uploading.\n");
1898                 rc = 1;
1899                 goto drop_rdata_kref;
1900         }
1901
1902         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
1903             test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags) ||
1904             test_bit(QEDF_CMD_IN_ABORT, &io_req->flags)) {
1905                 QEDF_ERR(&qedf->dbg_ctx,
1906                          "io_req xid=0x%x sc_cmd=%p already in cleanup or abort processing or already completed.\n",
1907                          io_req->xid, io_req->sc_cmd);
1908                 rc = 1;
1909                 goto drop_rdata_kref;
1910         }
1911
1912         kref_get(&io_req->refcount);
1913
1914         xid = io_req->xid;
1915         qedf->control_requests++;
1916         qedf->packet_aborts++;
1917
1918         /* Set the command type to abort */
1919         io_req->cmd_type = QEDF_ABTS;
1920         io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
1921
1922         set_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
1923         refcount = kref_read(&io_req->refcount);
1924         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
1925                   "ABTS io_req xid = 0x%x refcount=%d\n",
1926                   xid, refcount);
1927
1928         qedf_cmd_timer_set(qedf, io_req, QEDF_ABORT_TIMEOUT);
1929
1930         spin_lock_irqsave(&fcport->rport_lock, flags);
1931
1932         sqe_idx = qedf_get_sqe_idx(fcport);
1933         sqe = &fcport->sq[sqe_idx];
1934         memset(sqe, 0, sizeof(struct fcoe_wqe));
1935         io_req->task_params->sqe = sqe;
1936
1937         init_initiator_abort_fcoe_task(io_req->task_params);
1938         qedf_ring_doorbell(fcport);
1939
1940         spin_unlock_irqrestore(&fcport->rport_lock, flags);
1941
1942 drop_rdata_kref:
1943         kref_put(&rdata->kref, fc_rport_destroy);
1944 out:
1945         return rc;
1946 }
1947
1948 void qedf_process_abts_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
1949         struct qedf_ioreq *io_req)
1950 {
1951         uint32_t r_ctl;
1952         int rc;
1953         struct qedf_rport *fcport = io_req->fcport;
1954
1955         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "Entered with xid = "
1956                    "0x%x cmd_type = %d\n", io_req->xid, io_req->cmd_type);
1957
1958         r_ctl = cqe->cqe_info.abts_info.r_ctl;
1959
1960         /* This was added at a point when we were scheduling abts_compl &
1961          * cleanup_compl on different CPUs and there was a possibility of
1962          * the io_req to be freed from the other context before we got here.
1963          */
1964         if (!fcport) {
1965                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1966                           "Dropping ABTS completion xid=0x%x as fcport is NULL",
1967                           io_req->xid);
1968                 return;
1969         }
1970
1971         /*
1972          * When flush is active, let the cmds be completed from the cleanup
1973          * context
1974          */
1975         if (test_bit(QEDF_RPORT_IN_TARGET_RESET, &fcport->flags) ||
1976             test_bit(QEDF_RPORT_IN_LUN_RESET, &fcport->flags)) {
1977                 QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
1978                           "Dropping ABTS completion xid=0x%x as fcport is flushing",
1979                           io_req->xid);
1980                 return;
1981         }
1982
1983         if (!cancel_delayed_work(&io_req->timeout_work)) {
1984                 QEDF_ERR(&qedf->dbg_ctx,
1985                          "Wasn't able to cancel abts timeout work.\n");
1986         }
1987
1988         switch (r_ctl) {
1989         case FC_RCTL_BA_ACC:
1990                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
1991                     "ABTS response - ACC Send RRQ after R_A_TOV\n");
1992                 io_req->event = QEDF_IOREQ_EV_ABORT_SUCCESS;
1993                 rc = kref_get_unless_zero(&io_req->refcount);   /* ID: 003 */
1994                 if (!rc) {
1995                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
1996                                   "kref is already zero so ABTS was already completed or flushed xid=0x%x.\n",
1997                                   io_req->xid);
1998                         return;
1999                 }
2000                 /*
2001                  * Dont release this cmd yet. It will be relesed
2002                  * after we get RRQ response
2003                  */
2004                 queue_delayed_work(qedf->dpc_wq, &io_req->rrq_work,
2005                     msecs_to_jiffies(qedf->lport->r_a_tov));
2006                 atomic_set(&io_req->state, QEDFC_CMD_ST_RRQ_WAIT);
2007                 break;
2008         /* For error cases let the cleanup return the command */
2009         case FC_RCTL_BA_RJT:
2010                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
2011                    "ABTS response - RJT\n");
2012                 io_req->event = QEDF_IOREQ_EV_ABORT_FAILED;
2013                 break;
2014         default:
2015                 QEDF_ERR(&(qedf->dbg_ctx), "Unknown ABTS response\n");
2016                 break;
2017         }
2018
2019         clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
2020
2021         if (io_req->sc_cmd) {
2022                 if (!io_req->return_scsi_cmd_on_abts)
2023                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2024                                   "Not call scsi_done for xid=0x%x.\n",
2025                                   io_req->xid);
2026                 if (io_req->return_scsi_cmd_on_abts)
2027                         qedf_scsi_done(qedf, io_req, DID_ERROR);
2028         }
2029
2030         /* Notify eh_abort handler that ABTS is complete */
2031         complete(&io_req->abts_done);
2032
2033         kref_put(&io_req->refcount, qedf_release_cmd);
2034 }
2035
2036 int qedf_init_mp_req(struct qedf_ioreq *io_req)
2037 {
2038         struct qedf_mp_req *mp_req;
2039         struct scsi_sge *mp_req_bd;
2040         struct scsi_sge *mp_resp_bd;
2041         struct qedf_ctx *qedf = io_req->fcport->qedf;
2042         dma_addr_t addr;
2043         uint64_t sz;
2044
2045         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_MP_REQ, "Entered.\n");
2046
2047         mp_req = (struct qedf_mp_req *)&(io_req->mp_req);
2048         memset(mp_req, 0, sizeof(struct qedf_mp_req));
2049
2050         if (io_req->cmd_type != QEDF_ELS) {
2051                 mp_req->req_len = sizeof(struct fcp_cmnd);
2052                 io_req->data_xfer_len = mp_req->req_len;
2053         } else
2054                 mp_req->req_len = io_req->data_xfer_len;
2055
2056         mp_req->req_buf = dma_alloc_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
2057             &mp_req->req_buf_dma, GFP_KERNEL);
2058         if (!mp_req->req_buf) {
2059                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req buffer\n");
2060                 qedf_free_mp_resc(io_req);
2061                 return -ENOMEM;
2062         }
2063
2064         mp_req->resp_buf = dma_alloc_coherent(&qedf->pdev->dev,
2065             QEDF_PAGE_SIZE, &mp_req->resp_buf_dma, GFP_KERNEL);
2066         if (!mp_req->resp_buf) {
2067                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc TM resp "
2068                           "buffer\n");
2069                 qedf_free_mp_resc(io_req);
2070                 return -ENOMEM;
2071         }
2072
2073         /* Allocate and map mp_req_bd and mp_resp_bd */
2074         sz = sizeof(struct scsi_sge);
2075         mp_req->mp_req_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2076             &mp_req->mp_req_bd_dma, GFP_KERNEL);
2077         if (!mp_req->mp_req_bd) {
2078                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req bd\n");
2079                 qedf_free_mp_resc(io_req);
2080                 return -ENOMEM;
2081         }
2082
2083         mp_req->mp_resp_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
2084             &mp_req->mp_resp_bd_dma, GFP_KERNEL);
2085         if (!mp_req->mp_resp_bd) {
2086                 QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP resp bd\n");
2087                 qedf_free_mp_resc(io_req);
2088                 return -ENOMEM;
2089         }
2090
2091         /* Fill bd table */
2092         addr = mp_req->req_buf_dma;
2093         mp_req_bd = mp_req->mp_req_bd;
2094         mp_req_bd->sge_addr.lo = U64_LO(addr);
2095         mp_req_bd->sge_addr.hi = U64_HI(addr);
2096         mp_req_bd->sge_len = QEDF_PAGE_SIZE;
2097
2098         /*
2099          * MP buffer is either a task mgmt command or an ELS.
2100          * So the assumption is that it consumes a single bd
2101          * entry in the bd table
2102          */
2103         mp_resp_bd = mp_req->mp_resp_bd;
2104         addr = mp_req->resp_buf_dma;
2105         mp_resp_bd->sge_addr.lo = U64_LO(addr);
2106         mp_resp_bd->sge_addr.hi = U64_HI(addr);
2107         mp_resp_bd->sge_len = QEDF_PAGE_SIZE;
2108
2109         return 0;
2110 }
2111
2112 /*
2113  * Last ditch effort to clear the port if it's stuck. Used only after a
2114  * cleanup task times out.
2115  */
2116 static void qedf_drain_request(struct qedf_ctx *qedf)
2117 {
2118         if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
2119                 QEDF_ERR(&(qedf->dbg_ctx), "MCP drain already active.\n");
2120                 return;
2121         }
2122
2123         /* Set bit to return all queuecommand requests as busy */
2124         set_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2125
2126         /* Call qed drain request for function. Should be synchronous */
2127         qed_ops->common->drain(qedf->cdev);
2128
2129         /* Settle time for CQEs to be returned */
2130         msleep(100);
2131
2132         /* Unplug and continue */
2133         clear_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
2134 }
2135
2136 /*
2137  * Returns SUCCESS if the cleanup task does not timeout, otherwise return
2138  * FAILURE.
2139  */
2140 int qedf_initiate_cleanup(struct qedf_ioreq *io_req,
2141         bool return_scsi_cmd_on_abts)
2142 {
2143         struct qedf_rport *fcport;
2144         struct qedf_ctx *qedf;
2145         int tmo = 0;
2146         int rc = SUCCESS;
2147         unsigned long flags;
2148         struct fcoe_wqe *sqe;
2149         u16 sqe_idx;
2150         int refcount = 0;
2151
2152         fcport = io_req->fcport;
2153         if (!fcport) {
2154                 QEDF_ERR(NULL, "fcport is NULL.\n");
2155                 return SUCCESS;
2156         }
2157
2158         /* Sanity check qedf_rport before dereferencing any pointers */
2159         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2160                 QEDF_ERR(NULL, "tgt not offloaded\n");
2161                 return SUCCESS;
2162         }
2163
2164         qedf = fcport->qedf;
2165         if (!qedf) {
2166                 QEDF_ERR(NULL, "qedf is NULL.\n");
2167                 return SUCCESS;
2168         }
2169
2170         if (io_req->cmd_type == QEDF_ELS) {
2171                 goto process_els;
2172         }
2173
2174         if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
2175             test_and_set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags)) {
2176                 QEDF_ERR(&(qedf->dbg_ctx), "io_req xid=0x%x already in "
2177                           "cleanup processing or already completed.\n",
2178                           io_req->xid);
2179                 return SUCCESS;
2180         }
2181         set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2182
2183 process_els:
2184         /* Ensure room on SQ */
2185         if (!atomic_read(&fcport->free_sqes)) {
2186                 QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
2187                 /* Need to make sure we clear the flag since it was set */
2188                 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2189                 return FAILED;
2190         }
2191
2192         if (io_req->cmd_type == QEDF_CLEANUP) {
2193                 QEDF_ERR(&qedf->dbg_ctx,
2194                          "io_req=0x%x is already a cleanup command cmd_type=%d.\n",
2195                          io_req->xid, io_req->cmd_type);
2196                 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2197                 return SUCCESS;
2198         }
2199
2200         refcount = kref_read(&io_req->refcount);
2201
2202         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_IO,
2203                   "Entered xid=0x%x sc_cmd=%p cmd_type=%d flags=0x%lx refcount=%d fcport=%p port_id=0x%06x\n",
2204                   io_req->xid, io_req->sc_cmd, io_req->cmd_type, io_req->flags,
2205                   refcount, fcport, fcport->rdata->ids.port_id);
2206
2207         /* Cleanup cmds re-use the same TID as the original I/O */
2208         io_req->cmd_type = QEDF_CLEANUP;
2209         io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
2210
2211         init_completion(&io_req->cleanup_done);
2212
2213         spin_lock_irqsave(&fcport->rport_lock, flags);
2214
2215         sqe_idx = qedf_get_sqe_idx(fcport);
2216         sqe = &fcport->sq[sqe_idx];
2217         memset(sqe, 0, sizeof(struct fcoe_wqe));
2218         io_req->task_params->sqe = sqe;
2219
2220         init_initiator_cleanup_fcoe_task(io_req->task_params);
2221         qedf_ring_doorbell(fcport);
2222
2223         spin_unlock_irqrestore(&fcport->rport_lock, flags);
2224
2225         tmo = wait_for_completion_timeout(&io_req->cleanup_done,
2226                                           QEDF_CLEANUP_TIMEOUT * HZ);
2227
2228         if (!tmo) {
2229                 rc = FAILED;
2230                 /* Timeout case */
2231                 QEDF_ERR(&(qedf->dbg_ctx), "Cleanup command timeout, "
2232                           "xid=%x.\n", io_req->xid);
2233                 clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2234                 /* Issue a drain request if cleanup task times out */
2235                 QEDF_ERR(&(qedf->dbg_ctx), "Issuing MCP drain request.\n");
2236                 qedf_drain_request(qedf);
2237         }
2238
2239         /* If it TASK MGMT handle it, reference will be decreased
2240          * in qedf_execute_tmf
2241          */
2242         if (io_req->tm_flags  == FCP_TMF_LUN_RESET ||
2243             io_req->tm_flags == FCP_TMF_TGT_RESET) {
2244                 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2245                 io_req->sc_cmd = NULL;
2246                 complete(&io_req->tm_done);
2247         }
2248
2249         if (io_req->sc_cmd) {
2250                 if (!io_req->return_scsi_cmd_on_abts)
2251                         QEDF_INFO(&qedf->dbg_ctx, QEDF_LOG_SCSI_TM,
2252                                   "Not call scsi_done for xid=0x%x.\n",
2253                                   io_req->xid);
2254                 if (io_req->return_scsi_cmd_on_abts)
2255                         qedf_scsi_done(qedf, io_req, DID_ERROR);
2256         }
2257
2258         if (rc == SUCCESS)
2259                 io_req->event = QEDF_IOREQ_EV_CLEANUP_SUCCESS;
2260         else
2261                 io_req->event = QEDF_IOREQ_EV_CLEANUP_FAILED;
2262
2263         return rc;
2264 }
2265
2266 void qedf_process_cleanup_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2267         struct qedf_ioreq *io_req)
2268 {
2269         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid = 0x%x\n",
2270                    io_req->xid);
2271
2272         clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
2273
2274         /* Complete so we can finish cleaning up the I/O */
2275         complete(&io_req->cleanup_done);
2276 }
2277
2278 static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
2279         uint8_t tm_flags)
2280 {
2281         struct qedf_ioreq *io_req;
2282         struct e4_fcoe_task_context *task;
2283         struct qedf_ctx *qedf = fcport->qedf;
2284         struct fc_lport *lport = qedf->lport;
2285         int rc = 0;
2286         uint16_t xid;
2287         int tmo = 0;
2288         int lun = 0;
2289         unsigned long flags;
2290         struct fcoe_wqe *sqe;
2291         u16 sqe_idx;
2292
2293         if (!sc_cmd) {
2294                 QEDF_ERR(&qedf->dbg_ctx, "sc_cmd is NULL\n");
2295                 return FAILED;
2296         }
2297
2298         lun = (int)sc_cmd->device->lun;
2299         if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
2300                 QEDF_ERR(&(qedf->dbg_ctx), "fcport not offloaded\n");
2301                 rc = FAILED;
2302                 goto no_flush;
2303         }
2304
2305         io_req = qedf_alloc_cmd(fcport, QEDF_TASK_MGMT_CMD);
2306         if (!io_req) {
2307                 QEDF_ERR(&(qedf->dbg_ctx), "Failed TMF");
2308                 rc = -EAGAIN;
2309                 goto no_flush;
2310         }
2311
2312         if (tm_flags == FCP_TMF_LUN_RESET)
2313                 qedf->lun_resets++;
2314         else if (tm_flags == FCP_TMF_TGT_RESET)
2315                 qedf->target_resets++;
2316
2317         /* Initialize rest of io_req fields */
2318         io_req->sc_cmd = sc_cmd;
2319         io_req->fcport = fcport;
2320         io_req->cmd_type = QEDF_TASK_MGMT_CMD;
2321
2322         /* Record which cpu this request is associated with */
2323         io_req->cpu = smp_processor_id();
2324
2325         /* Set TM flags */
2326         io_req->io_req_flags = QEDF_READ;
2327         io_req->data_xfer_len = 0;
2328         io_req->tm_flags = tm_flags;
2329
2330         /* Default is to return a SCSI command when an error occurs */
2331         io_req->return_scsi_cmd_on_abts = false;
2332
2333         /* Obtain exchange id */
2334         xid = io_req->xid;
2335
2336         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "TMF io_req xid = "
2337                    "0x%x\n", xid);
2338
2339         /* Initialize task context for this IO request */
2340         task = qedf_get_task_mem(&qedf->tasks, xid);
2341
2342         init_completion(&io_req->tm_done);
2343
2344         spin_lock_irqsave(&fcport->rport_lock, flags);
2345
2346         sqe_idx = qedf_get_sqe_idx(fcport);
2347         sqe = &fcport->sq[sqe_idx];
2348         memset(sqe, 0, sizeof(struct fcoe_wqe));
2349
2350         qedf_init_task(fcport, lport, io_req, task, sqe);
2351         qedf_ring_doorbell(fcport);
2352
2353         spin_unlock_irqrestore(&fcport->rport_lock, flags);
2354
2355         set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2356         tmo = wait_for_completion_timeout(&io_req->tm_done,
2357             QEDF_TM_TIMEOUT * HZ);
2358
2359         if (!tmo) {
2360                 rc = FAILED;
2361                 QEDF_ERR(&(qedf->dbg_ctx), "wait for tm_cmpl timeout!\n");
2362                 /* Clear outstanding bit since command timed out */
2363                 clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2364                 io_req->sc_cmd = NULL;
2365         } else {
2366                 /* Check TMF response code */
2367                 if (io_req->fcp_rsp_code == 0)
2368                         rc = SUCCESS;
2369                 else
2370                         rc = FAILED;
2371         }
2372         /*
2373          * Double check that fcport has not gone into an uploading state before
2374          * executing the command flush for the LUN/target.
2375          */
2376         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2377                 QEDF_ERR(&qedf->dbg_ctx,
2378                          "fcport is uploading, not executing flush.\n");
2379                 goto no_flush;
2380         }
2381         /* We do not need this io_req any more */
2382         kref_put(&io_req->refcount, qedf_release_cmd);
2383
2384
2385         if (tm_flags == FCP_TMF_LUN_RESET)
2386                 qedf_flush_active_ios(fcport, lun);
2387         else
2388                 qedf_flush_active_ios(fcport, -1);
2389
2390 no_flush:
2391         if (rc != SUCCESS) {
2392                 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command failed...\n");
2393                 rc = FAILED;
2394         } else {
2395                 QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command success...\n");
2396                 rc = SUCCESS;
2397         }
2398         return rc;
2399 }
2400
2401 int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
2402 {
2403         struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2404         struct fc_rport_libfc_priv *rp = rport->dd_data;
2405         struct qedf_rport *fcport = (struct qedf_rport *)&rp[1];
2406         struct qedf_ctx *qedf;
2407         struct fc_lport *lport = shost_priv(sc_cmd->device->host);
2408         int rc = SUCCESS;
2409         int rval;
2410         struct qedf_ioreq *io_req = NULL;
2411         int ref_cnt = 0;
2412         struct fc_rport_priv *rdata = fcport->rdata;
2413
2414         QEDF_ERR(NULL,
2415                  "tm_flags 0x%x sc_cmd %p op = 0x%02x target_id = 0x%x lun=%d\n",
2416                  tm_flags, sc_cmd, sc_cmd->cmd_len ? sc_cmd->cmnd[0] : 0xff,
2417                  rport->scsi_target_id, (int)sc_cmd->device->lun);
2418
2419         if (!rdata || !kref_get_unless_zero(&rdata->kref)) {
2420                 QEDF_ERR(NULL, "stale rport\n");
2421                 return FAILED;
2422         }
2423
2424         QEDF_ERR(NULL, "portid=%06x tm_flags =%s\n", rdata->ids.port_id,
2425                  (tm_flags == FCP_TMF_TGT_RESET) ? "TARGET RESET" :
2426                  "LUN RESET");
2427
2428         if (sc_cmd->SCp.ptr) {
2429                 io_req = (struct qedf_ioreq *)sc_cmd->SCp.ptr;
2430                 ref_cnt = kref_read(&io_req->refcount);
2431                 QEDF_ERR(NULL,
2432                          "orig io_req = %p xid = 0x%x ref_cnt = %d.\n",
2433                          io_req, io_req->xid, ref_cnt);
2434         }
2435
2436         rval = fc_remote_port_chkready(rport);
2437         if (rval) {
2438                 QEDF_ERR(NULL, "device_reset rport not ready\n");
2439                 rc = FAILED;
2440                 goto tmf_err;
2441         }
2442
2443         rc = fc_block_scsi_eh(sc_cmd);
2444         if (rc)
2445                 goto tmf_err;
2446
2447         if (!fcport) {
2448                 QEDF_ERR(NULL, "device_reset: rport is NULL\n");
2449                 rc = FAILED;
2450                 goto tmf_err;
2451         }
2452
2453         qedf = fcport->qedf;
2454
2455         if (!qedf) {
2456                 QEDF_ERR(NULL, "qedf is NULL.\n");
2457                 rc = FAILED;
2458                 goto tmf_err;
2459         }
2460
2461         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2462                 QEDF_ERR(&qedf->dbg_ctx, "Connection is getting uploaded.\n");
2463                 rc = SUCCESS;
2464                 goto tmf_err;
2465         }
2466
2467         if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
2468             test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
2469                 rc = SUCCESS;
2470                 goto tmf_err;
2471         }
2472
2473         if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
2474                 QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
2475                 rc = FAILED;
2476                 goto tmf_err;
2477         }
2478
2479         if (test_bit(QEDF_RPORT_UPLOADING_CONNECTION, &fcport->flags)) {
2480                 if (!fcport->rdata)
2481                         QEDF_ERR(&qedf->dbg_ctx, "fcport %p is uploading.\n",
2482                                  fcport);
2483                 else
2484                         QEDF_ERR(&qedf->dbg_ctx,
2485                                  "fcport %p port_id=%06x is uploading.\n",
2486                                  fcport, fcport->rdata->ids.port_id);
2487                 rc = FAILED;
2488                 goto tmf_err;
2489         }
2490
2491         rc = qedf_execute_tmf(fcport, sc_cmd, tm_flags);
2492
2493 tmf_err:
2494         kref_put(&rdata->kref, fc_rport_destroy);
2495         return rc;
2496 }
2497
2498 void qedf_process_tmf_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
2499         struct qedf_ioreq *io_req)
2500 {
2501         struct fcoe_cqe_rsp_info *fcp_rsp;
2502
2503         clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
2504
2505         fcp_rsp = &cqe->cqe_info.rsp_info;
2506         qedf_parse_fcp_rsp(io_req, fcp_rsp);
2507
2508         io_req->sc_cmd = NULL;
2509         complete(&io_req->tm_done);
2510 }
2511
2512 void qedf_process_unsol_compl(struct qedf_ctx *qedf, uint16_t que_idx,
2513         struct fcoe_cqe *cqe)
2514 {
2515         unsigned long flags;
2516         uint16_t pktlen = cqe->cqe_info.unsolic_info.pkt_len;
2517         u32 payload_len, crc;
2518         struct fc_frame_header *fh;
2519         struct fc_frame *fp;
2520         struct qedf_io_work *io_work;
2521         u32 bdq_idx;
2522         void *bdq_addr;
2523         struct scsi_bd *p_bd_info;
2524
2525         p_bd_info = &cqe->cqe_info.unsolic_info.bd_info;
2526         QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2527                   "address.hi=%x, address.lo=%x, opaque_data.hi=%x, opaque_data.lo=%x, bdq_prod_idx=%u, len=%u\n",
2528                   le32_to_cpu(p_bd_info->address.hi),
2529                   le32_to_cpu(p_bd_info->address.lo),
2530                   le32_to_cpu(p_bd_info->opaque.fcoe_opaque.hi),
2531                   le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo),
2532                   qedf->bdq_prod_idx, pktlen);
2533
2534         bdq_idx = le32_to_cpu(p_bd_info->opaque.fcoe_opaque.lo);
2535         if (bdq_idx >= QEDF_BDQ_SIZE) {
2536                 QEDF_ERR(&(qedf->dbg_ctx), "bdq_idx is out of range %d.\n",
2537                     bdq_idx);
2538                 goto increment_prod;
2539         }
2540
2541         bdq_addr = qedf->bdq[bdq_idx].buf_addr;
2542         if (!bdq_addr) {
2543                 QEDF_ERR(&(qedf->dbg_ctx), "bdq_addr is NULL, dropping "
2544                     "unsolicited packet.\n");
2545                 goto increment_prod;
2546         }
2547
2548         if (qedf_dump_frames) {
2549                 QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
2550                     "BDQ frame is at addr=%p.\n", bdq_addr);
2551                 print_hex_dump(KERN_WARNING, "bdq ", DUMP_PREFIX_OFFSET, 16, 1,
2552                     (void *)bdq_addr, pktlen, false);
2553         }
2554
2555         /* Allocate frame */
2556         payload_len = pktlen - sizeof(struct fc_frame_header);
2557         fp = fc_frame_alloc(qedf->lport, payload_len);
2558         if (!fp) {
2559                 QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate fp.\n");
2560                 goto increment_prod;
2561         }
2562
2563         /* Copy data from BDQ buffer into fc_frame struct */
2564         fh = (struct fc_frame_header *)fc_frame_header_get(fp);
2565         memcpy(fh, (void *)bdq_addr, pktlen);
2566
2567         QEDF_WARN(&qedf->dbg_ctx,
2568                   "Processing Unsolicated frame, src=%06x dest=%06x r_ctl=0x%x type=0x%x cmd=%02x\n",
2569                   ntoh24(fh->fh_s_id), ntoh24(fh->fh_d_id), fh->fh_r_ctl,
2570                   fh->fh_type, fc_frame_payload_op(fp));
2571
2572         /* Initialize the frame so libfc sees it as a valid frame */
2573         crc = fcoe_fc_crc(fp);
2574         fc_frame_init(fp);
2575         fr_dev(fp) = qedf->lport;
2576         fr_sof(fp) = FC_SOF_I3;
2577         fr_eof(fp) = FC_EOF_T;
2578         fr_crc(fp) = cpu_to_le32(~crc);
2579
2580         /*
2581          * We need to return the frame back up to libfc in a non-atomic
2582          * context
2583          */
2584         io_work = mempool_alloc(qedf->io_mempool, GFP_ATOMIC);
2585         if (!io_work) {
2586                 QEDF_WARN(&(qedf->dbg_ctx), "Could not allocate "
2587                            "work for I/O completion.\n");
2588                 fc_frame_free(fp);
2589                 goto increment_prod;
2590         }
2591         memset(io_work, 0, sizeof(struct qedf_io_work));
2592
2593         INIT_WORK(&io_work->work, qedf_fp_io_handler);
2594
2595         /* Copy contents of CQE for deferred processing */
2596         memcpy(&io_work->cqe, cqe, sizeof(struct fcoe_cqe));
2597
2598         io_work->qedf = qedf;
2599         io_work->fp = fp;
2600
2601         queue_work_on(smp_processor_id(), qedf_io_wq, &io_work->work);
2602 increment_prod:
2603         spin_lock_irqsave(&qedf->hba_lock, flags);
2604
2605         /* Increment producer to let f/w know we've handled the frame */
2606         qedf->bdq_prod_idx++;
2607
2608         /* Producer index wraps at uint16_t boundary */
2609         if (qedf->bdq_prod_idx == 0xffff)
2610                 qedf->bdq_prod_idx = 0;
2611
2612         writew(qedf->bdq_prod_idx, qedf->bdq_primary_prod);
2613         readw(qedf->bdq_primary_prod);
2614         writew(qedf->bdq_prod_idx, qedf->bdq_secondary_prod);
2615         readw(qedf->bdq_secondary_prod);
2616
2617         spin_unlock_irqrestore(&qedf->hba_lock, flags);
2618 }