drivers/scsi/fnic/fnic_scsi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6 #include <linux/mempool.h>
   7 #include <linux/errno.h>
   8 #include <linux/init.h>
   9 #include <linux/workqueue.h>
  10 #include <linux/pci.h>
  11 #include <linux/scatterlist.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/if_vlan.h>
  17 #include <linux/delay.h>
  18 #include <linux/gfp.h>
  19 #include <scsi/scsi.h>
  20 #include <scsi/scsi_host.h>
  21 #include <scsi/scsi_device.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_tcq.h>
  24 #include <scsi/fc/fc_els.h>
  25 #include <scsi/fc/fc_fcoe.h>
  26 #include <scsi/libfc.h>
  27 #include <scsi/fc_frame.h>
  28 #include "fnic_io.h"
  29 #include "fnic.h"
  30
  31 const char *fnic_state_str[] = {
  32         [FNIC_IN_FC_MODE] =           "FNIC_IN_FC_MODE",
  33         [FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
  34         [FNIC_IN_ETH_MODE] =          "FNIC_IN_ETH_MODE",
  35         [FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
  36 };
  37
  38 static const char *fnic_ioreq_state_str[] = {
  39         [FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED",
  40         [FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
  41         [FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
  42         [FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
  43         [FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
  44 };
  45
  46 static const char *fcpio_status_str[] =  {
  47         [FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
  48         [FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
  49         [FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
  50         [FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
  51         [FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
  52         [FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
  53         [FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
  54         [FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
  55         [FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
  56         [FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
  57         [FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
  58         [FCPIO_FW_ERR] = "FCPIO_FW_ERR",
  59         [FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
  60         [FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
  61         [FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
  62         [FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
  63         [FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
  64         [FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
  65         [FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
  66 };
  67
  68 const char *fnic_state_to_str(unsigned int state)
  69 {
  70         if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
  71                 return "unknown";
  72
  73         return fnic_state_str[state];
  74 }
  75
  76 static const char *fnic_ioreq_state_to_str(unsigned int state)
  77 {
  78         if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
  79             !fnic_ioreq_state_str[state])
  80                 return "unknown";
  81
  82         return fnic_ioreq_state_str[state];
  83 }
  84
  85 static const char *fnic_fcpio_status_to_str(unsigned int status)
  86 {
  87         if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
  88                 return "unknown";
  89
  90         return fcpio_status_str[status];
  91 }
  92
  93 static void fnic_cleanup_io(struct fnic *fnic);
  94
  95 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
  96                                             struct scsi_cmnd *sc)
  97 {
  98         u32 hash = scsi_cmd_to_rq(sc)->tag & (FNIC_IO_LOCKS - 1);
  99
 100         return &fnic->io_req_lock[hash];
 101 }
 102
 103 static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic,
 104                                             int tag)
 105 {
 106         return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)];
 107 }
 108
 109 /*
 110  * Unmap the data buffer and sense buffer for an io_req,
 111  * also unmap and free the device-private scatter/gather list.
 112  */
 113 static void fnic_release_ioreq_buf(struct fnic *fnic,
 114                                    struct fnic_io_req *io_req,
 115                                    struct scsi_cmnd *sc)
 116 {
 117         if (io_req->sgl_list_pa)
 118                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 119                                  sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
 120                                  DMA_TO_DEVICE);
 121         scsi_dma_unmap(sc);
 122
 123         if (io_req->sgl_cnt)
 124                 mempool_free(io_req->sgl_list_alloc,
 125                              fnic->io_sgl_pool[io_req->sgl_type]);
 126         if (io_req->sense_buf_pa)
 127                 dma_unmap_single(&fnic->pdev->dev, io_req->sense_buf_pa,
 128                                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 129 }
 130
 131 /* Free up Copy Wq descriptors. Called with copy_wq lock held */
 132 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
 133 {
 134         /* if no Ack received from firmware, then nothing to clean */
 135         if (!fnic->fw_ack_recd[0])
 136                 return 1;
 137
 138         /*
 139          * Update desc_available count based on number of freed descriptors
 140          * Account for wraparound
 141          */
 142         if (wq->to_clean_index <= fnic->fw_ack_index[0])
 143                 wq->ring.desc_avail += (fnic->fw_ack_index[0]
 144                                         - wq->to_clean_index + 1);
 145         else
 146                 wq->ring.desc_avail += (wq->ring.desc_count
 147                                         - wq->to_clean_index
 148                                         + fnic->fw_ack_index[0] + 1);
 149
 150         /*
 151          * just bump clean index to ack_index+1 accounting for wraparound
 152          * this will essentially free up all descriptors between
 153          * to_clean_index and fw_ack_index, both inclusive
 154          */
 155         wq->to_clean_index =
 156                 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
 157
 158         /* we have processed the acks received so far */
 159         fnic->fw_ack_recd[0] = 0;
 160         return 0;
 161 }
 162
 163
 164 /*
 165  * __fnic_set_state_flags
 166  * Sets/Clears bits in fnic's state_flags
 167  **/
 168 void
 169 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
 170                         unsigned long clearbits)
 171 {
 172         unsigned long flags = 0;
 173         unsigned long host_lock_flags = 0;
 174
 175         spin_lock_irqsave(&fnic->fnic_lock, flags);
 176         spin_lock_irqsave(fnic->lport->host->host_lock, host_lock_flags);
 177
 178         if (clearbits)
 179                 fnic->state_flags &= ~st_flags;
 180         else
 181                 fnic->state_flags |= st_flags;
 182
 183         spin_unlock_irqrestore(fnic->lport->host->host_lock, host_lock_flags);
 184         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 185
 186         return;
 187 }
 188
 189
 190 /*
 191  * fnic_fw_reset_handler
 192  * Routine to send reset msg to fw
 193  */
 194 int fnic_fw_reset_handler(struct fnic *fnic)
 195 {
 196         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 197         int ret = 0;
 198         unsigned long flags;
 199
 200         /* indicate fwreset to io path */
 201         fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET);
 202
 203         skb_queue_purge(&fnic->frame_queue);
 204         skb_queue_purge(&fnic->tx_queue);
 205
 206         /* wait for io cmpl */
 207         while (atomic_read(&fnic->in_flight))
 208                 schedule_timeout(msecs_to_jiffies(1));
 209
 210         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 211
 212         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 213                 free_wq_copy_descs(fnic, wq);
 214
 215         if (!vnic_wq_copy_desc_avail(wq))
 216                 ret = -EAGAIN;
 217         else {
 218                 fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);
 219                 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 220                 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 221                           atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 222                         atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 223                                 atomic64_read(
 224                                   &fnic->fnic_stats.fw_stats.active_fw_reqs));
 225         }
 226
 227         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 228
 229         if (!ret) {
 230                 atomic64_inc(&fnic->fnic_stats.reset_stats.fw_resets);
 231                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 232                               "Issued fw reset\n");
 233         } else {
 234                 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 235                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 236                               "Failed to issue fw reset\n");
 237         }
 238
 239         return ret;
 240 }
 241
 242
 243 /*
 244  * fnic_flogi_reg_handler
 245  * Routine to send flogi register msg to fw
 246  */
 247 int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
 248 {
 249         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 250         enum fcpio_flogi_reg_format_type format;
 251         struct fc_lport *lp = fnic->lport;
 252         u8 gw_mac[ETH_ALEN];
 253         int ret = 0;
 254         unsigned long flags;
 255
 256         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 257
 258         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 259                 free_wq_copy_descs(fnic, wq);
 260
 261         if (!vnic_wq_copy_desc_avail(wq)) {
 262                 ret = -EAGAIN;
 263                 goto flogi_reg_ioreq_end;
 264         }
 265
 266         if (fnic->ctlr.map_dest) {
 267                 eth_broadcast_addr(gw_mac);
 268                 format = FCPIO_FLOGI_REG_DEF_DEST;
 269         } else {
 270                 memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
 271                 format = FCPIO_FLOGI_REG_GW_DEST;
 272         }
 273
 274         if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
 275                 fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
 276                                                 fc_id, gw_mac,
 277                                                 fnic->data_src_addr,
 278                                                 lp->r_a_tov, lp->e_d_tov);
 279                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 280                               "FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
 281                               fc_id, fnic->data_src_addr, gw_mac);
 282         } else {
 283                 fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
 284                                                   format, fc_id, gw_mac);
 285                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 286                               "FLOGI reg issued fcid %x map %d dest %pM\n",
 287                               fc_id, fnic->ctlr.map_dest, gw_mac);
 288         }
 289
 290         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 291         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 292                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 293                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 294                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 295
 296 flogi_reg_ioreq_end:
 297         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 298         return ret;
 299 }
 300
 301 /*
 302  * fnic_queue_wq_copy_desc
 303  * Routine to enqueue a wq copy desc
 304  */
 305 static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
 306                                           struct vnic_wq_copy *wq,
 307                                           struct fnic_io_req *io_req,
 308                                           struct scsi_cmnd *sc,
 309                                           int sg_count)
 310 {
 311         struct scatterlist *sg;
 312         struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
 313         struct fc_rport_libfc_priv *rp = rport->dd_data;
 314         struct host_sg_desc *desc;
 315         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
 316         unsigned int i;
 317         unsigned long intr_flags;
 318         int flags;
 319         u8 exch_flags;
 320         struct scsi_lun fc_lun;
 321
 322         if (sg_count) {
 323                 /* For each SGE, create a device desc entry */
 324                 desc = io_req->sgl_list;
 325                 for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
 326                         desc->addr = cpu_to_le64(sg_dma_address(sg));
 327                         desc->len = cpu_to_le32(sg_dma_len(sg));
 328                         desc->_resvd = 0;
 329                         desc++;
 330                 }
 331
 332                 io_req->sgl_list_pa = dma_map_single(&fnic->pdev->dev,
 333                                 io_req->sgl_list,
 334                                 sizeof(io_req->sgl_list[0]) * sg_count,
 335                                 DMA_TO_DEVICE);
 336                 if (dma_mapping_error(&fnic->pdev->dev, io_req->sgl_list_pa)) {
 337                         printk(KERN_ERR "DMA mapping failed\n");
 338                         return SCSI_MLQUEUE_HOST_BUSY;
 339                 }
 340         }
 341
 342         io_req->sense_buf_pa = dma_map_single(&fnic->pdev->dev,
 343                                               sc->sense_buffer,
 344                                               SCSI_SENSE_BUFFERSIZE,
 345                                               DMA_FROM_DEVICE);
 346         if (dma_mapping_error(&fnic->pdev->dev, io_req->sense_buf_pa)) {
 347                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 348                                 sizeof(io_req->sgl_list[0]) * sg_count,
 349                                 DMA_TO_DEVICE);
 350                 printk(KERN_ERR "DMA mapping failed\n");
 351                 return SCSI_MLQUEUE_HOST_BUSY;
 352         }
 353
 354         int_to_scsilun(sc->device->lun, &fc_lun);
 355
 356         /* Enqueue the descriptor in the Copy WQ */
 357         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
 358
 359         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 360                 free_wq_copy_descs(fnic, wq);
 361
 362         if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
 363                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 364                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 365                           "fnic_queue_wq_copy_desc failure - no descriptors\n");
 366                 atomic64_inc(&misc_stats->io_cpwq_alloc_failures);
 367                 return SCSI_MLQUEUE_HOST_BUSY;
 368         }
 369
 370         flags = 0;
 371         if (sc->sc_data_direction == DMA_FROM_DEVICE)
 372                 flags = FCPIO_ICMND_RDDATA;
 373         else if (sc->sc_data_direction == DMA_TO_DEVICE)
 374                 flags = FCPIO_ICMND_WRDATA;
 375
 376         exch_flags = 0;
 377         if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
 378             (rp->flags & FC_RP_FLAGS_RETRY))
 379                 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
 380
 381         fnic_queue_wq_copy_desc_icmnd_16(wq, scsi_cmd_to_rq(sc)->tag,
 382                                          0, exch_flags, io_req->sgl_cnt,
 383                                          SCSI_SENSE_BUFFERSIZE,
 384                                          io_req->sgl_list_pa,
 385                                          io_req->sense_buf_pa,
 386                                          0, /* scsi cmd ref, always 0 */
 387                                          FCPIO_ICMND_PTA_SIMPLE,
 388                                                 /* scsi pri and tag */
 389                                          flags, /* command flags */
 390                                          sc->cmnd, sc->cmd_len,
 391                                          scsi_bufflen(sc),
 392                                          fc_lun.scsi_lun, io_req->port_id,
 393                                          rport->maxframe_size, rp->r_a_tov,
 394                                          rp->e_d_tov);
 395
 396         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 397         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 398                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 399                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 400                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 401
 402         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 403         return 0;
 404 }
 405
 406 /*
 407  * fnic_queuecommand
 408  * Routine to send a scsi cdb
 409  * Called with host_lock held and interrupts disabled.
 410  */
 411 static int fnic_queuecommand_lck(struct scsi_cmnd *sc)
 412 {
 413         void (*done)(struct scsi_cmnd *) = scsi_done;
 414         const int tag = scsi_cmd_to_rq(sc)->tag;
 415         struct fc_lport *lp = shost_priv(sc->device->host);
 416         struct fc_rport *rport;
 417         struct fnic_io_req *io_req = NULL;
 418         struct fnic *fnic = lport_priv(lp);
 419         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 420         struct vnic_wq_copy *wq;
 421         int ret;
 422         u64 cmd_trace;
 423         int sg_count = 0;
 424         unsigned long flags = 0;
 425         unsigned long ptr;
 426         spinlock_t *io_lock = NULL;
 427         int io_lock_acquired = 0;
 428         struct fc_rport_libfc_priv *rp;
 429
 430         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
 431                 return SCSI_MLQUEUE_HOST_BUSY;
 432
 433         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_FWRESET)))
 434                 return SCSI_MLQUEUE_HOST_BUSY;
 435
 436         rport = starget_to_rport(scsi_target(sc->device));
 437         if (!rport) {
 438                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 439                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 440                 sc->result = DID_NO_CONNECT << 16;
 441                 done(sc);
 442                 return 0;
 443         }
 444
 445         ret = fc_remote_port_chkready(rport);
 446         if (ret) {
 447                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 448                                 "rport is not ready\n");
 449                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 450                 sc->result = ret;
 451                 done(sc);
 452                 return 0;
 453         }
 454
 455         rp = rport->dd_data;
 456         if (!rp || rp->rp_state == RPORT_ST_DELETE) {
 457                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 458                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 459                         rport->port_id);
 460
 461                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 462                 sc->result = DID_NO_CONNECT<<16;
 463                 done(sc);
 464                 return 0;
 465         }
 466
 467         if (rp->rp_state != RPORT_ST_READY) {
 468                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 469                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 470                         rport->port_id, rp->rp_state);
 471
 472                 sc->result = DID_IMM_RETRY << 16;
 473                 done(sc);
 474                 return 0;
 475         }
 476
 477         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 478                 return SCSI_MLQUEUE_HOST_BUSY;
 479
 480         atomic_inc(&fnic->in_flight);
 481
 482         /*
 483          * Release host lock, use driver resource specific locks from here.
 484          * Don't re-enable interrupts in case they were disabled prior to the
 485          * caller disabling them.
 486          */
 487         spin_unlock(lp->host->host_lock);
 488         fnic_priv(sc)->state = FNIC_IOREQ_NOT_INITED;
 489         fnic_priv(sc)->flags = FNIC_NO_FLAGS;
 490
 491         /* Get a new io_req for this SCSI IO */
 492         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 493         if (!io_req) {
 494                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 495                 ret = SCSI_MLQUEUE_HOST_BUSY;
 496                 goto out;
 497         }
 498         memset(io_req, 0, sizeof(*io_req));
 499
 500         /* Map the data buffer */
 501         sg_count = scsi_dma_map(sc);
 502         if (sg_count < 0) {
 503                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 504                           tag, sc, 0, sc->cmnd[0], sg_count, fnic_priv(sc)->state);
 505                 mempool_free(io_req, fnic->io_req_pool);
 506                 goto out;
 507         }
 508
 509         /* Determine the type of scatter/gather list we need */
 510         io_req->sgl_cnt = sg_count;
 511         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 512         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 513                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 514
 515         if (sg_count) {
 516                 io_req->sgl_list =
 517                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 518                                       GFP_ATOMIC);
 519                 if (!io_req->sgl_list) {
 520                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 521                         ret = SCSI_MLQUEUE_HOST_BUSY;
 522                         scsi_dma_unmap(sc);
 523                         mempool_free(io_req, fnic->io_req_pool);
 524                         goto out;
 525                 }
 526
 527                 /* Cache sgl list allocated address before alignment */
 528                 io_req->sgl_list_alloc = io_req->sgl_list;
 529                 ptr = (unsigned long) io_req->sgl_list;
 530                 if (ptr % FNIC_SG_DESC_ALIGN) {
 531                         io_req->sgl_list = (struct host_sg_desc *)
 532                                 (((unsigned long) ptr
 533                                   + FNIC_SG_DESC_ALIGN - 1)
 534                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 535                 }
 536         }
 537
 538         /*
 539         * Will acquire lock defore setting to IO initialized.
 540         */
 541
 542         io_lock = fnic_io_lock_hash(fnic, sc);
 543         spin_lock_irqsave(io_lock, flags);
 544
 545         /* initialize rest of io_req */
 546         io_lock_acquired = 1;
 547         io_req->port_id = rport->port_id;
 548         io_req->start_time = jiffies;
 549         fnic_priv(sc)->state = FNIC_IOREQ_CMD_PENDING;
 550         fnic_priv(sc)->io_req = io_req;
 551         fnic_priv(sc)->flags |= FNIC_IO_INITIALIZED;
 552
 553         /* create copy wq desc and enqueue it */
 554         wq = &fnic->wq_copy[0];
 555         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 556         if (ret) {
 557                 /*
 558                  * In case another thread cancelled the request,
 559                  * refetch the pointer under the lock.
 560                  */
 561                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 562                           tag, sc, 0, 0, 0, fnic_flags_and_state(sc));
 563                 io_req = fnic_priv(sc)->io_req;
 564                 fnic_priv(sc)->io_req = NULL;
 565                 fnic_priv(sc)->state = FNIC_IOREQ_CMD_COMPLETE;
 566                 spin_unlock_irqrestore(io_lock, flags);
 567                 if (io_req) {
 568                         fnic_release_ioreq_buf(fnic, io_req, sc);
 569                         mempool_free(io_req, fnic->io_req_pool);
 570                 }
 571                 atomic_dec(&fnic->in_flight);
 572                 /* acquire host lock before returning to SCSI */
 573                 spin_lock(lp->host->host_lock);
 574                 return ret;
 575         } else {
 576                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 577                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 578                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 579                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 580                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 581                              atomic64_read(&fnic_stats->io_stats.active_ios));
 582
 583                 /* REVISIT: Use per IO lock in the final code */
 584                 fnic_priv(sc)->flags |= FNIC_IO_ISSUED;
 585         }
 586 out:
 587         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 588                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 589                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 590                         sc->cmnd[5]);
 591
 592         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 593                    tag, sc, io_req, sg_count, cmd_trace,
 594                    fnic_flags_and_state(sc));
 595
 596         /* if only we issued IO, will we have the io lock */
 597         if (io_lock_acquired)
 598                 spin_unlock_irqrestore(io_lock, flags);
 599
 600         atomic_dec(&fnic->in_flight);
 601         /* acquire host lock before returning to SCSI */
 602         spin_lock(lp->host->host_lock);
 603         return ret;
 604 }
 605
 606 DEF_SCSI_QCMD(fnic_queuecommand)
 607
 608 /*
 609  * fnic_fcpio_fw_reset_cmpl_handler
 610  * Routine to handle fw reset completion
 611  */
 612 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 613                                             struct fcpio_fw_req *desc)
 614 {
 615         u8 type;
 616         u8 hdr_status;
 617         struct fcpio_tag tag;
 618         int ret = 0;
 619         unsigned long flags;
 620         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 621
 622         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 623
 624         atomic64_inc(&reset_stats->fw_reset_completions);
 625
 626         /* Clean up all outstanding io requests */
 627         fnic_cleanup_io(fnic);
 628
 629         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 630         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 631         atomic64_set(&fnic->io_cmpl_skip, 0);
 632
 633         spin_lock_irqsave(&fnic->fnic_lock, flags);
 634
 635         /* fnic should be in FC_TRANS_ETH_MODE */
 636         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 637                 /* Check status of reset completion */
 638                 if (!hdr_status) {
 639                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 640                                       "reset cmpl success\n");
 641                         /* Ready to send flogi out */
 642                         fnic->state = FNIC_IN_ETH_MODE;
 643                 } else {
 644                         FNIC_SCSI_DBG(KERN_DEBUG,
 645                                       fnic->lport->host,
 646                                       "fnic fw_reset : failed %s\n",
 647                                       fnic_fcpio_status_to_str(hdr_status));
 648
 649                         /*
 650                          * Unable to change to eth mode, cannot send out flogi
 651                          * Change state to fc mode, so that subsequent Flogi
 652                          * requests from libFC will cause more attempts to
 653                          * reset the firmware. Free the cached flogi
 654                          */
 655                         fnic->state = FNIC_IN_FC_MODE;
 656                         atomic64_inc(&reset_stats->fw_reset_failures);
 657                         ret = -1;
 658                 }
 659         } else {
 660                 FNIC_SCSI_DBG(KERN_DEBUG,
 661                               fnic->lport->host,
 662                               "Unexpected state %s while processing"
 663                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 664                 atomic64_inc(&reset_stats->fw_reset_failures);
 665                 ret = -1;
 666         }
 667
 668         /* Thread removing device blocks till firmware reset is complete */
 669         if (fnic->remove_wait)
 670                 complete(fnic->remove_wait);
 671
 672         /*
 673          * If fnic is being removed, or fw reset failed
 674          * free the flogi frame. Else, send it out
 675          */
 676         if (fnic->remove_wait || ret) {
 677                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 678                 skb_queue_purge(&fnic->tx_queue);
 679                 goto reset_cmpl_handler_end;
 680         }
 681
 682         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 683
 684         fnic_flush_tx(fnic);
 685
 686  reset_cmpl_handler_end:
 687         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 688
 689         return ret;
 690 }
 691
 692 /*
 693  * fnic_fcpio_flogi_reg_cmpl_handler
 694  * Routine to handle flogi register completion
 695  */
 696 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 697                                              struct fcpio_fw_req *desc)
 698 {
 699         u8 type;
 700         u8 hdr_status;
 701         struct fcpio_tag tag;
 702         int ret = 0;
 703         unsigned long flags;
 704
 705         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 706
 707         /* Update fnic state based on status of flogi reg completion */
 708         spin_lock_irqsave(&fnic->fnic_lock, flags);
 709
 710         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 711
 712                 /* Check flogi registration completion status */
 713                 if (!hdr_status) {
 714                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 715                                       "flog reg succeeded\n");
 716                         fnic->state = FNIC_IN_FC_MODE;
 717                 } else {
 718                         FNIC_SCSI_DBG(KERN_DEBUG,
 719                                       fnic->lport->host,
 720                                       "fnic flogi reg :failed %s\n",
 721                                       fnic_fcpio_status_to_str(hdr_status));
 722                         fnic->state = FNIC_IN_ETH_MODE;
 723                         ret = -1;
 724                 }
 725         } else {
 726                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 727                               "Unexpected fnic state %s while"
 728                               " processing flogi reg completion\n",
 729                               fnic_state_to_str(fnic->state));
 730                 ret = -1;
 731         }
 732
 733         if (!ret) {
 734                 if (fnic->stop_rx_link_events) {
 735                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 736                         goto reg_cmpl_handler_end;
 737                 }
 738                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 739
 740                 fnic_flush_tx(fnic);
 741                 queue_work(fnic_event_queue, &fnic->frame_work);
 742         } else {
 743                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 744         }
 745
 746 reg_cmpl_handler_end:
 747         return ret;
 748 }
 749
 750 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 751                                         u16 request_out)
 752 {
 753         if (wq->to_clean_index <= wq->to_use_index) {
 754                 /* out of range, stale request_out index */
 755                 if (request_out < wq->to_clean_index ||
 756                     request_out >= wq->to_use_index)
 757                         return 0;
 758         } else {
 759                 /* out of range, stale request_out index */
 760                 if (request_out < wq->to_clean_index &&
 761                     request_out >= wq->to_use_index)
 762                         return 0;
 763         }
 764         /* request_out index is in range */
 765         return 1;
 766 }
 767
 768
 769 /*
 770  * Mark that ack received and store the Ack index. If there are multiple
 771  * acks received before Tx thread cleans it up, the latest value will be
 772  * used which is correct behavior. This state should be in the copy Wq
 773  * instead of in the fnic
 774  */
 775 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 776                                           unsigned int cq_index,
 777                                           struct fcpio_fw_req *desc)
 778 {
 779         struct vnic_wq_copy *wq;
 780         u16 request_out = desc->u.ack.request_out;
 781         unsigned long flags;
 782         u64 *ox_id_tag = (u64 *)(void *)desc;
 783
 784         /* mark the ack state */
 785         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 786         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 787
 788         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 789         if (is_ack_index_in_range(wq, request_out)) {
 790                 fnic->fw_ack_index[0] = request_out;
 791                 fnic->fw_ack_recd[0] = 1;
 792         } else
 793                 atomic64_inc(
 794                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 795
 796         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 797         FNIC_TRACE(fnic_fcpio_ack_handler,
 798                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 799                   ox_id_tag[4], ox_id_tag[5]);
 800 }
 801
 802 /*
 803  * fnic_fcpio_icmnd_cmpl_handler
 804  * Routine to handle icmnd completions
 805  */
 806 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 807                                          struct fcpio_fw_req *desc)
 808 {
 809         u8 type;
 810         u8 hdr_status;
 811         struct fcpio_tag tag;
 812         u32 id;
 813         u64 xfer_len = 0;
 814         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 815         struct fnic_io_req *io_req;
 816         struct scsi_cmnd *sc;
 817         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 818         unsigned long flags;
 819         spinlock_t *io_lock;
 820         u64 cmd_trace;
 821         unsigned long start_time;
 822         unsigned long io_duration_time;
 823
 824         /* Decode the cmpl description to get the io_req id */
 825         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 826         fcpio_tag_id_dec(&tag, &id);
 827         icmnd_cmpl = &desc->u.icmnd_cmpl;
 828
 829         if (id >= fnic->fnic_max_tag_id) {
 830                 shost_printk(KERN_ERR, fnic->lport->host,
 831                         "Tag out of range tag %x hdr status = %s\n",
 832                              id, fnic_fcpio_status_to_str(hdr_status));
 833                 return;
 834         }
 835
 836         sc = scsi_host_find_tag(fnic->lport->host, id);
 837         WARN_ON_ONCE(!sc);
 838         if (!sc) {
 839                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 840                 shost_printk(KERN_ERR, fnic->lport->host,
 841                           "icmnd_cmpl sc is null - "
 842                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 843                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 844                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 845                           fnic->lport->host->host_no, id,
 846                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 847                           (u64)icmnd_cmpl->_resvd0[0]),
 848                           ((u64)hdr_status << 16 |
 849                           (u64)icmnd_cmpl->scsi_status << 8 |
 850                           (u64)icmnd_cmpl->flags), desc,
 851                           (u64)icmnd_cmpl->residual, 0);
 852                 return;
 853         }
 854
 855         io_lock = fnic_io_lock_hash(fnic, sc);
 856         spin_lock_irqsave(io_lock, flags);
 857         io_req = fnic_priv(sc)->io_req;
 858         WARN_ON_ONCE(!io_req);
 859         if (!io_req) {
 860                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 861                 fnic_priv(sc)->flags |= FNIC_IO_REQ_NULL;
 862                 spin_unlock_irqrestore(io_lock, flags);
 863                 shost_printk(KERN_ERR, fnic->lport->host,
 864                           "icmnd_cmpl io_req is null - "
 865                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 866                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 867                 return;
 868         }
 869         start_time = io_req->start_time;
 870
 871         /* firmware completed the io */
 872         io_req->io_completed = 1;
 873
 874         /*
 875          *  if SCSI-ML has already issued abort on this command,
 876          *  set completion of the IO. The abts path will clean it up
 877          */
 878         if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING) {
 879
 880                 /*
 881                  * set the FNIC_IO_DONE so that this doesn't get
 882                  * flagged as 'out of order' if it was not aborted
 883                  */
 884                 fnic_priv(sc)->flags |= FNIC_IO_DONE;
 885                 fnic_priv(sc)->flags |= FNIC_IO_ABTS_PENDING;
 886                 spin_unlock_irqrestore(io_lock, flags);
 887                 if(FCPIO_ABORTED == hdr_status)
 888                         fnic_priv(sc)->flags |= FNIC_IO_ABORTED;
 889
 890                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 891                         "icmnd_cmpl abts pending "
 892                           "hdr status = %s tag = 0x%x sc = 0x%p "
 893                           "scsi_status = %x residual = %d\n",
 894                           fnic_fcpio_status_to_str(hdr_status),
 895                           id, sc,
 896                           icmnd_cmpl->scsi_status,
 897                           icmnd_cmpl->residual);
 898                 return;
 899         }
 900
 901         /* Mark the IO as complete */
 902         fnic_priv(sc)->state = FNIC_IOREQ_CMD_COMPLETE;
 903
 904         icmnd_cmpl = &desc->u.icmnd_cmpl;
 905
 906         switch (hdr_status) {
 907         case FCPIO_SUCCESS:
 908                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 909                 xfer_len = scsi_bufflen(sc);
 910
 911                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER) {
 912                         xfer_len -= icmnd_cmpl->residual;
 913                         scsi_set_resid(sc, icmnd_cmpl->residual);
 914                 }
 915
 916                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 917                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 918
 919                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 920                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 921                 break;
 922
 923         case FCPIO_TIMEOUT:          /* request was timed out */
 924                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 925                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 926                 break;
 927
 928         case FCPIO_ABORTED:          /* request was aborted */
 929                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 930                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 931                 break;
 932
 933         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 934                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 935                 scsi_set_resid(sc, icmnd_cmpl->residual);
 936                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 937                 break;
 938
 939         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 940                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 941                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 942                 break;
 943
 944         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 945                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 946                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 947                 break;
 948
 949         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 950                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 951                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 952                 break;
 953
 954         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 955                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 956                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 957                 break;
 958
 959         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 960                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 961                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 962                 break;
 963
 964         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 965         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 966         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 967         default:
 968                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 969                 break;
 970         }
 971
 972         /* Break link with the SCSI command */
 973         fnic_priv(sc)->io_req = NULL;
 974         fnic_priv(sc)->flags |= FNIC_IO_DONE;
 975
 976         if (hdr_status != FCPIO_SUCCESS) {
 977                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 978                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 979                              fnic_fcpio_status_to_str(hdr_status));
 980         }
 981
 982         fnic_release_ioreq_buf(fnic, io_req, sc);
 983
 984         cmd_trace = ((u64)hdr_status << 56) |
 985                   (u64)icmnd_cmpl->scsi_status << 48 |
 986                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
 987                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
 988                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
 989
 990         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 991                   sc->device->host->host_no, id, sc,
 992                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
 993                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
 994                   jiffies_to_msecs(jiffies - start_time)),
 995                   desc, cmd_trace, fnic_flags_and_state(sc));
 996
 997         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
 998                 fnic->lport->host_stats.fcp_input_requests++;
 999                 fnic->fcp_input_bytes += xfer_len;
1000         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1001                 fnic->lport->host_stats.fcp_output_requests++;
1002                 fnic->fcp_output_bytes += xfer_len;
1003         } else
1004                 fnic->lport->host_stats.fcp_control_requests++;
1005
1006         /* Call SCSI completion function to complete the IO */
1007         scsi_done(sc);
1008         spin_unlock_irqrestore(io_lock, flags);
1009
1010         mempool_free(io_req, fnic->io_req_pool);
1011
1012         atomic64_dec(&fnic_stats->io_stats.active_ios);
1013         if (atomic64_read(&fnic->io_cmpl_skip))
1014                 atomic64_dec(&fnic->io_cmpl_skip);
1015         else
1016                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1017
1018
1019         io_duration_time = jiffies_to_msecs(jiffies) -
1020                                                 jiffies_to_msecs(start_time);
1021
1022         if(io_duration_time <= 10)
1023                 atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
1024         else if(io_duration_time <= 100)
1025                 atomic64_inc(&fnic_stats->io_stats.io_btw_10_to_100_msec);
1026         else if(io_duration_time <= 500)
1027                 atomic64_inc(&fnic_stats->io_stats.io_btw_100_to_500_msec);
1028         else if(io_duration_time <= 5000)
1029                 atomic64_inc(&fnic_stats->io_stats.io_btw_500_to_5000_msec);
1030         else if(io_duration_time <= 10000)
1031                 atomic64_inc(&fnic_stats->io_stats.io_btw_5000_to_10000_msec);
1032         else if(io_duration_time <= 30000)
1033                 atomic64_inc(&fnic_stats->io_stats.io_btw_10000_to_30000_msec);
1034         else {
1035                 atomic64_inc(&fnic_stats->io_stats.io_greater_than_30000_msec);
1036
1037                 if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
1038                         atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
1039         }
1040 }
1041
1042 /* fnic_fcpio_itmf_cmpl_handler
1043  * Routine to handle itmf completions
1044  */
1045 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1046                                         struct fcpio_fw_req *desc)
1047 {
1048         u8 type;
1049         u8 hdr_status;
1050         struct fcpio_tag tag;
1051         u32 id;
1052         struct scsi_cmnd *sc;
1053         struct fnic_io_req *io_req;
1054         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1055         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1056         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1057         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1058         unsigned long flags;
1059         spinlock_t *io_lock;
1060         unsigned long start_time;
1061
1062         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1063         fcpio_tag_id_dec(&tag, &id);
1064
1065         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1066                 shost_printk(KERN_ERR, fnic->lport->host,
1067                 "Tag out of range tag %x hdr status = %s\n",
1068                 id, fnic_fcpio_status_to_str(hdr_status));
1069                 return;
1070         }
1071
1072         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1073         WARN_ON_ONCE(!sc);
1074         if (!sc) {
1075                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1076                 shost_printk(KERN_ERR, fnic->lport->host,
1077                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1078                           fnic_fcpio_status_to_str(hdr_status), id);
1079                 return;
1080         }
1081         io_lock = fnic_io_lock_hash(fnic, sc);
1082         spin_lock_irqsave(io_lock, flags);
1083         io_req = fnic_priv(sc)->io_req;
1084         WARN_ON_ONCE(!io_req);
1085         if (!io_req) {
1086                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1087                 spin_unlock_irqrestore(io_lock, flags);
1088                 fnic_priv(sc)->flags |= FNIC_IO_ABT_TERM_REQ_NULL;
1089                 shost_printk(KERN_ERR, fnic->lport->host,
1090                           "itmf_cmpl io_req is null - "
1091                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1092                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1093                 return;
1094         }
1095         start_time = io_req->start_time;
1096
1097         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1098                 /* Abort and terminate completion of device reset req */
1099                 /* REVISIT : Add asserts about various flags */
1100                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1101                               "dev reset abts cmpl recd. id %x status %s\n",
1102                               id, fnic_fcpio_status_to_str(hdr_status));
1103                 fnic_priv(sc)->state = FNIC_IOREQ_ABTS_COMPLETE;
1104                 fnic_priv(sc)->abts_status = hdr_status;
1105                 fnic_priv(sc)->flags |= FNIC_DEV_RST_DONE;
1106                 if (io_req->abts_done)
1107                         complete(io_req->abts_done);
1108                 spin_unlock_irqrestore(io_lock, flags);
1109         } else if (id & FNIC_TAG_ABORT) {
1110                 /* Completion of abort cmd */
1111                 switch (hdr_status) {
1112                 case FCPIO_SUCCESS:
1113                         break;
1114                 case FCPIO_TIMEOUT:
1115                         if (fnic_priv(sc)->flags & FNIC_IO_ABTS_ISSUED)
1116                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1117                         else
1118                                 atomic64_inc(
1119                                         &term_stats->terminate_fw_timeouts);
1120                         break;
1121                 case FCPIO_ITMF_REJECTED:
1122                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1123                                 "abort reject recd. id %d\n",
1124                                 (int)(id & FNIC_TAG_MASK));
1125                         break;
1126                 case FCPIO_IO_NOT_FOUND:
1127                         if (fnic_priv(sc)->flags & FNIC_IO_ABTS_ISSUED)
1128                                 atomic64_inc(&abts_stats->abort_io_not_found);
1129                         else
1130                                 atomic64_inc(
1131                                         &term_stats->terminate_io_not_found);
1132                         break;
1133                 default:
1134                         if (fnic_priv(sc)->flags & FNIC_IO_ABTS_ISSUED)
1135                                 atomic64_inc(&abts_stats->abort_failures);
1136                         else
1137                                 atomic64_inc(
1138                                         &term_stats->terminate_failures);
1139                         break;
1140                 }
1141                 if (fnic_priv(sc)->state != FNIC_IOREQ_ABTS_PENDING) {
1142                         /* This is a late completion. Ignore it */
1143                         spin_unlock_irqrestore(io_lock, flags);
1144                         return;
1145                 }
1146
1147                 fnic_priv(sc)->flags |= FNIC_IO_ABT_TERM_DONE;
1148                 fnic_priv(sc)->abts_status = hdr_status;
1149
1150                 /* If the status is IO not found consider it as success */
1151                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1152                         fnic_priv(sc)->abts_status = FCPIO_SUCCESS;
1153
1154                 if (!(fnic_priv(sc)->flags & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1155                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1156
1157                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1158                               "abts cmpl recd. id %d status %s\n",
1159                               (int)(id & FNIC_TAG_MASK),
1160                               fnic_fcpio_status_to_str(hdr_status));
1161
1162                 /*
1163                  * If scsi_eh thread is blocked waiting for abts to complete,
1164                  * signal completion to it. IO will be cleaned in the thread
1165                  * else clean it in this context
1166                  */
1167                 if (io_req->abts_done) {
1168                         complete(io_req->abts_done);
1169                         spin_unlock_irqrestore(io_lock, flags);
1170                 } else {
1171                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1172                                       "abts cmpl, completing IO\n");
1173                         fnic_priv(sc)->io_req = NULL;
1174                         sc->result = (DID_ERROR << 16);
1175
1176                         spin_unlock_irqrestore(io_lock, flags);
1177
1178                         fnic_release_ioreq_buf(fnic, io_req, sc);
1179                         mempool_free(io_req, fnic->io_req_pool);
1180                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1181                                    sc->device->host->host_no, id,
1182                                    sc,
1183                                    jiffies_to_msecs(jiffies - start_time),
1184                                    desc,
1185                                    (((u64)hdr_status << 40) |
1186                                     (u64)sc->cmnd[0] << 32 |
1187                                     (u64)sc->cmnd[2] << 24 |
1188                                     (u64)sc->cmnd[3] << 16 |
1189                                     (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1190                                    fnic_flags_and_state(sc));
1191                         scsi_done(sc);
1192                         atomic64_dec(&fnic_stats->io_stats.active_ios);
1193                         if (atomic64_read(&fnic->io_cmpl_skip))
1194                                 atomic64_dec(&fnic->io_cmpl_skip);
1195                         else
1196                                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1197                 }
1198         } else if (id & FNIC_TAG_DEV_RST) {
1199                 /* Completion of device reset */
1200                 fnic_priv(sc)->lr_status = hdr_status;
1201                 if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING) {
1202                         spin_unlock_irqrestore(io_lock, flags);
1203                         fnic_priv(sc)->flags |= FNIC_DEV_RST_ABTS_PENDING;
1204                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1205                                   sc->device->host->host_no, id, sc,
1206                                   jiffies_to_msecs(jiffies - start_time),
1207                                   desc, 0, fnic_flags_and_state(sc));
1208                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1209                                 "Terminate pending "
1210                                 "dev reset cmpl recd. id %d status %s\n",
1211                                 (int)(id & FNIC_TAG_MASK),
1212                                 fnic_fcpio_status_to_str(hdr_status));
1213                         return;
1214                 }
1215                 if (fnic_priv(sc)->flags & FNIC_DEV_RST_TIMED_OUT) {
1216                         /* Need to wait for terminate completion */
1217                         spin_unlock_irqrestore(io_lock, flags);
1218                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1219                                   sc->device->host->host_no, id, sc,
1220                                   jiffies_to_msecs(jiffies - start_time),
1221                                   desc, 0, fnic_flags_and_state(sc));
1222                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1223                                 "dev reset cmpl recd after time out. "
1224                                 "id %d status %s\n",
1225                                 (int)(id & FNIC_TAG_MASK),
1226                                 fnic_fcpio_status_to_str(hdr_status));
1227                         return;
1228                 }
1229                 fnic_priv(sc)->state = FNIC_IOREQ_CMD_COMPLETE;
1230                 fnic_priv(sc)->flags |= FNIC_DEV_RST_DONE;
1231                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1232                               "dev reset cmpl recd. id %d status %s\n",
1233                               (int)(id & FNIC_TAG_MASK),
1234                               fnic_fcpio_status_to_str(hdr_status));
1235                 if (io_req->dr_done)
1236                         complete(io_req->dr_done);
1237                 spin_unlock_irqrestore(io_lock, flags);
1238
1239         } else {
1240                 shost_printk(KERN_ERR, fnic->lport->host,
1241                              "Unexpected itmf io state %s tag %x\n",
1242                              fnic_ioreq_state_to_str(fnic_priv(sc)->state), id);
1243                 spin_unlock_irqrestore(io_lock, flags);
1244         }
1245
1246 }
1247
1248 /*
1249  * fnic_fcpio_cmpl_handler
1250  * Routine to service the cq for wq_copy
1251  */
1252 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1253                                    unsigned int cq_index,
1254                                    struct fcpio_fw_req *desc)
1255 {
1256         struct fnic *fnic = vnic_dev_priv(vdev);
1257
1258         switch (desc->hdr.type) {
1259         case FCPIO_ICMND_CMPL: /* fw completed a command */
1260         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1261         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1262         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1263         case FCPIO_RESET_CMPL: /* fw completed reset */
1264                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1265                 break;
1266         default:
1267                 break;
1268         }
1269
1270         switch (desc->hdr.type) {
1271         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1272                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1273                 break;
1274
1275         case FCPIO_ICMND_CMPL: /* fw completed a command */
1276                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1277                 break;
1278
1279         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1280                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1281                 break;
1282
1283         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1284         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1285                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1286                 break;
1287
1288         case FCPIO_RESET_CMPL: /* fw completed reset */
1289                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1290                 break;
1291
1292         default:
1293                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1294                               "firmware completion type %d\n",
1295                               desc->hdr.type);
1296                 break;
1297         }
1298
1299         return 0;
1300 }
1301
1302 /*
1303  * fnic_wq_copy_cmpl_handler
1304  * Routine to process wq copy
1305  */
1306 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1307 {
1308         unsigned int wq_work_done = 0;
1309         unsigned int i, cq_index;
1310         unsigned int cur_work_done;
1311         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1312         u64 start_jiffies = 0;
1313         u64 end_jiffies = 0;
1314         u64 delta_jiffies = 0;
1315         u64 delta_ms = 0;
1316
1317         for (i = 0; i < fnic->wq_copy_count; i++) {
1318                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1319
1320                 start_jiffies = jiffies;
1321                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1322                                                      fnic_fcpio_cmpl_handler,
1323                                                      copy_work_to_do);
1324                 end_jiffies = jiffies;
1325
1326                 wq_work_done += cur_work_done;
1327                 delta_jiffies = end_jiffies - start_jiffies;
1328                 if (delta_jiffies >
1329                         (u64) atomic64_read(&misc_stats->max_isr_jiffies)) {
1330                         atomic64_set(&misc_stats->max_isr_jiffies,
1331                                         delta_jiffies);
1332                         delta_ms = jiffies_to_msecs(delta_jiffies);
1333                         atomic64_set(&misc_stats->max_isr_time_ms, delta_ms);
1334                         atomic64_set(&misc_stats->corr_work_done,
1335                                         cur_work_done);
1336                 }
1337         }
1338         return wq_work_done;
1339 }
1340
1341 static bool fnic_cleanup_io_iter(struct scsi_cmnd *sc, void *data)
1342 {
1343         const int tag = scsi_cmd_to_rq(sc)->tag;
1344         struct fnic *fnic = data;
1345         struct fnic_io_req *io_req;
1346         unsigned long flags = 0;
1347         spinlock_t *io_lock;
1348         unsigned long start_time = 0;
1349         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1350
1351         io_lock = fnic_io_lock_tag(fnic, tag);
1352         spin_lock_irqsave(io_lock, flags);
1353
1354         io_req = fnic_priv(sc)->io_req;
1355         if ((fnic_priv(sc)->flags & FNIC_DEVICE_RESET) &&
1356             !(fnic_priv(sc)->flags & FNIC_DEV_RST_DONE)) {
1357                 /*
1358                  * We will be here only when FW completes reset
1359                  * without sending completions for outstanding ios.
1360                  */
1361                 fnic_priv(sc)->flags |= FNIC_DEV_RST_DONE;
1362                 if (io_req && io_req->dr_done)
1363                         complete(io_req->dr_done);
1364                 else if (io_req && io_req->abts_done)
1365                         complete(io_req->abts_done);
1366                 spin_unlock_irqrestore(io_lock, flags);
1367                 return true;
1368         } else if (fnic_priv(sc)->flags & FNIC_DEVICE_RESET) {
1369                 spin_unlock_irqrestore(io_lock, flags);
1370                 return true;
1371         }
1372         if (!io_req) {
1373                 spin_unlock_irqrestore(io_lock, flags);
1374                 goto cleanup_scsi_cmd;
1375         }
1376
1377         fnic_priv(sc)->io_req = NULL;
1378
1379         spin_unlock_irqrestore(io_lock, flags);
1380
1381         /*
1382          * If there is a scsi_cmnd associated with this io_req, then
1383          * free the corresponding state
1384          */
1385         start_time = io_req->start_time;
1386         fnic_release_ioreq_buf(fnic, io_req, sc);
1387         mempool_free(io_req, fnic->io_req_pool);
1388
1389 cleanup_scsi_cmd:
1390         sc->result = DID_TRANSPORT_DISRUPTED << 16;
1391         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1392                       "fnic_cleanup_io: tag:0x%x : sc:0x%p duration = %lu DID_TRANSPORT_DISRUPTED\n",
1393                       tag, sc, jiffies - start_time);
1394
1395         if (atomic64_read(&fnic->io_cmpl_skip))
1396                 atomic64_dec(&fnic->io_cmpl_skip);
1397         else
1398                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1399
1400         /* Complete the command to SCSI */
1401         if (!(fnic_priv(sc)->flags & FNIC_IO_ISSUED))
1402                 shost_printk(KERN_ERR, fnic->lport->host,
1403                              "Calling done for IO not issued to fw: tag:0x%x sc:0x%p\n",
1404                              tag, sc);
1405
1406         FNIC_TRACE(fnic_cleanup_io,
1407                    sc->device->host->host_no, tag, sc,
1408                    jiffies_to_msecs(jiffies - start_time),
1409                    0, ((u64)sc->cmnd[0] << 32 |
1410                        (u64)sc->cmnd[2] << 24 |
1411                        (u64)sc->cmnd[3] << 16 |
1412                        (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1413                    fnic_flags_and_state(sc));
1414
1415         scsi_done(sc);
1416
1417         return true;
1418 }
1419
1420 static void fnic_cleanup_io(struct fnic *fnic)
1421 {
1422         scsi_host_busy_iter(fnic->lport->host,
1423                             fnic_cleanup_io_iter, fnic);
1424 }
1425
1426 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1427                                   struct fcpio_host_req *desc)
1428 {
1429         u32 id;
1430         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1431         struct fnic_io_req *io_req;
1432         struct scsi_cmnd *sc;
1433         unsigned long flags;
1434         spinlock_t *io_lock;
1435         unsigned long start_time = 0;
1436
1437         /* get the tag reference */
1438         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1439         id &= FNIC_TAG_MASK;
1440
1441         if (id >= fnic->fnic_max_tag_id)
1442                 return;
1443
1444         sc = scsi_host_find_tag(fnic->lport->host, id);
1445         if (!sc)
1446                 return;
1447
1448         io_lock = fnic_io_lock_hash(fnic, sc);
1449         spin_lock_irqsave(io_lock, flags);
1450
1451         /* Get the IO context which this desc refers to */
1452         io_req = fnic_priv(sc)->io_req;
1453
1454         /* fnic interrupts are turned off by now */
1455
1456         if (!io_req) {
1457                 spin_unlock_irqrestore(io_lock, flags);
1458                 goto wq_copy_cleanup_scsi_cmd;
1459         }
1460
1461         fnic_priv(sc)->io_req = NULL;
1462
1463         spin_unlock_irqrestore(io_lock, flags);
1464
1465         start_time = io_req->start_time;
1466         fnic_release_ioreq_buf(fnic, io_req, sc);
1467         mempool_free(io_req, fnic->io_req_pool);
1468
1469 wq_copy_cleanup_scsi_cmd:
1470         sc->result = DID_NO_CONNECT << 16;
1471         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1472                       " DID_NO_CONNECT\n");
1473
1474         FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1475                    sc->device->host->host_no, id, sc,
1476                    jiffies_to_msecs(jiffies - start_time),
1477                    0, ((u64)sc->cmnd[0] << 32 |
1478                        (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1479                        (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1480                    fnic_flags_and_state(sc));
1481
1482         scsi_done(sc);
1483 }
1484
1485 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1486                                           u32 task_req, u8 *fc_lun,
1487                                           struct fnic_io_req *io_req)
1488 {
1489         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1490         struct Scsi_Host *host = fnic->lport->host;
1491         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1492         unsigned long flags;
1493
1494         spin_lock_irqsave(host->host_lock, flags);
1495         if (unlikely(fnic_chk_state_flags_locked(fnic,
1496                                                 FNIC_FLAGS_IO_BLOCKED))) {
1497                 spin_unlock_irqrestore(host->host_lock, flags);
1498                 return 1;
1499         } else
1500                 atomic_inc(&fnic->in_flight);
1501         spin_unlock_irqrestore(host->host_lock, flags);
1502
1503         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1504
1505         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1506                 free_wq_copy_descs(fnic, wq);
1507
1508         if (!vnic_wq_copy_desc_avail(wq)) {
1509                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1510                 atomic_dec(&fnic->in_flight);
1511                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1512                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1513                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1514                 return 1;
1515         }
1516         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1517                                      0, task_req, tag, fc_lun, io_req->port_id,
1518                                      fnic->config.ra_tov, fnic->config.ed_tov);
1519
1520         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1521         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1522                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1523                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1524                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1525
1526         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1527         atomic_dec(&fnic->in_flight);
1528
1529         return 0;
1530 }
1531
1532 struct fnic_rport_abort_io_iter_data {
1533         struct fnic *fnic;
1534         u32 port_id;
1535         int term_cnt;
1536 };
1537
1538 static bool fnic_rport_abort_io_iter(struct scsi_cmnd *sc, void *data)
1539 {
1540         struct fnic_rport_abort_io_iter_data *iter_data = data;
1541         struct fnic *fnic = iter_data->fnic;
1542         int abt_tag = scsi_cmd_to_rq(sc)->tag;
1543         struct fnic_io_req *io_req;
1544         spinlock_t *io_lock;
1545         unsigned long flags;
1546         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1547         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1548         struct scsi_lun fc_lun;
1549         enum fnic_ioreq_state old_ioreq_state;
1550
1551         io_lock = fnic_io_lock_tag(fnic, abt_tag);
1552         spin_lock_irqsave(io_lock, flags);
1553
1554         io_req = fnic_priv(sc)->io_req;
1555
1556         if (!io_req || io_req->port_id != iter_data->port_id) {
1557                 spin_unlock_irqrestore(io_lock, flags);
1558                 return true;
1559         }
1560
1561         if ((fnic_priv(sc)->flags & FNIC_DEVICE_RESET) &&
1562             !(fnic_priv(sc)->flags & FNIC_DEV_RST_ISSUED)) {
1563                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1564                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1565                         sc);
1566                 spin_unlock_irqrestore(io_lock, flags);
1567                 return true;
1568         }
1569
1570         /*
1571          * Found IO that is still pending with firmware and
1572          * belongs to rport that went away
1573          */
1574         if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING) {
1575                 spin_unlock_irqrestore(io_lock, flags);
1576                 return true;
1577         }
1578         if (io_req->abts_done) {
1579                 shost_printk(KERN_ERR, fnic->lport->host,
1580                         "fnic_rport_exch_reset: io_req->abts_done is set "
1581                         "state is %s\n",
1582                         fnic_ioreq_state_to_str(fnic_priv(sc)->state));
1583         }
1584
1585         if (!(fnic_priv(sc)->flags & FNIC_IO_ISSUED)) {
1586                 shost_printk(KERN_ERR, fnic->lport->host,
1587                              "rport_exch_reset "
1588                              "IO not yet issued %p tag 0x%x flags "
1589                              "%x state %d\n",
1590                              sc, abt_tag, fnic_priv(sc)->flags, fnic_priv(sc)->state);
1591         }
1592         old_ioreq_state = fnic_priv(sc)->state;
1593         fnic_priv(sc)->state = FNIC_IOREQ_ABTS_PENDING;
1594         fnic_priv(sc)->abts_status = FCPIO_INVALID_CODE;
1595         if (fnic_priv(sc)->flags & FNIC_DEVICE_RESET) {
1596                 atomic64_inc(&reset_stats->device_reset_terminates);
1597                 abt_tag |= FNIC_TAG_DEV_RST;
1598         }
1599         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1600                       "fnic_rport_exch_reset dev rst sc 0x%p\n", sc);
1601         BUG_ON(io_req->abts_done);
1602
1603         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1604                       "fnic_rport_reset_exch: Issuing abts\n");
1605
1606         spin_unlock_irqrestore(io_lock, flags);
1607
1608         /* Now queue the abort command to firmware */
1609         int_to_scsilun(sc->device->lun, &fc_lun);
1610
1611         if (fnic_queue_abort_io_req(fnic, abt_tag,
1612                                     FCPIO_ITMF_ABT_TASK_TERM,
1613                                     fc_lun.scsi_lun, io_req)) {
1614                 /*
1615                  * Revert the cmd state back to old state, if
1616                  * it hasn't changed in between. This cmd will get
1617                  * aborted later by scsi_eh, or cleaned up during
1618                  * lun reset
1619                  */
1620                 spin_lock_irqsave(io_lock, flags);
1621                 if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING)
1622                         fnic_priv(sc)->state = old_ioreq_state;
1623                 spin_unlock_irqrestore(io_lock, flags);
1624         } else {
1625                 spin_lock_irqsave(io_lock, flags);
1626                 if (fnic_priv(sc)->flags & FNIC_DEVICE_RESET)
1627                         fnic_priv(sc)->flags |= FNIC_DEV_RST_TERM_ISSUED;
1628                 else
1629                         fnic_priv(sc)->flags |= FNIC_IO_INTERNAL_TERM_ISSUED;
1630                 spin_unlock_irqrestore(io_lock, flags);
1631                 atomic64_inc(&term_stats->terminates);
1632                 iter_data->term_cnt++;
1633         }
1634         return true;
1635 }
1636
1637 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1638 {
1639         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1640         struct fnic_rport_abort_io_iter_data iter_data = {
1641                 .fnic = fnic,
1642                 .port_id = port_id,
1643                 .term_cnt = 0,
1644         };
1645
1646         FNIC_SCSI_DBG(KERN_DEBUG,
1647                       fnic->lport->host,
1648                       "fnic_rport_exch_reset called portid 0x%06x\n",
1649                       port_id);
1650
1651         if (fnic->in_remove)
1652                 return;
1653
1654         scsi_host_busy_iter(fnic->lport->host, fnic_rport_abort_io_iter,
1655                             &iter_data);
1656         if (iter_data.term_cnt > atomic64_read(&term_stats->max_terminates))
1657                 atomic64_set(&term_stats->max_terminates, iter_data.term_cnt);
1658
1659 }
1660
1661 void fnic_terminate_rport_io(struct fc_rport *rport)
1662 {
1663         struct fc_rport_libfc_priv *rdata;
1664         struct fc_lport *lport;
1665         struct fnic *fnic;
1666
1667         if (!rport) {
1668                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1669                 return;
1670         }
1671         rdata = rport->dd_data;
1672
1673         if (!rdata) {
1674                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1675                 return;
1676         }
1677         lport = rdata->local_port;
1678
1679         if (!lport) {
1680                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1681                 return;
1682         }
1683         fnic = lport_priv(lport);
1684         FNIC_SCSI_DBG(KERN_DEBUG,
1685                       fnic->lport->host, "fnic_terminate_rport_io called"
1686                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1687                       rport->port_name, rport->node_name, rport,
1688                       rport->port_id);
1689
1690         if (fnic->in_remove)
1691                 return;
1692
1693         fnic_rport_exch_reset(fnic, rport->port_id);
1694 }
1695
1696 /*
1697  * This function is exported to SCSI for sending abort cmnds.
1698  * A SCSI IO is represented by a io_req in the driver.
1699  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1700  */
1701 int fnic_abort_cmd(struct scsi_cmnd *sc)
1702 {
1703         struct request *const rq = scsi_cmd_to_rq(sc);
1704         struct fc_lport *lp;
1705         struct fnic *fnic;
1706         struct fnic_io_req *io_req = NULL;
1707         struct fc_rport *rport;
1708         spinlock_t *io_lock;
1709         unsigned long flags;
1710         unsigned long start_time = 0;
1711         int ret = SUCCESS;
1712         u32 task_req = 0;
1713         struct scsi_lun fc_lun;
1714         struct fnic_stats *fnic_stats;
1715         struct abort_stats *abts_stats;
1716         struct terminate_stats *term_stats;
1717         enum fnic_ioreq_state old_ioreq_state;
1718         const int tag = rq->tag;
1719         unsigned long abt_issued_time;
1720         DECLARE_COMPLETION_ONSTACK(tm_done);
1721
1722         /* Wait for rport to unblock */
1723         fc_block_scsi_eh(sc);
1724
1725         /* Get local-port, check ready and link up */
1726         lp = shost_priv(sc->device->host);
1727
1728         fnic = lport_priv(lp);
1729         fnic_stats = &fnic->fnic_stats;
1730         abts_stats = &fnic->fnic_stats.abts_stats;
1731         term_stats = &fnic->fnic_stats.term_stats;
1732
1733         rport = starget_to_rport(scsi_target(sc->device));
1734         FNIC_SCSI_DBG(KERN_DEBUG,
1735                 fnic->lport->host,
1736                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1737                 rport->port_id, sc->device->lun, tag, fnic_priv(sc)->flags);
1738
1739         fnic_priv(sc)->flags = FNIC_NO_FLAGS;
1740
1741         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1742                 ret = FAILED;
1743                 goto fnic_abort_cmd_end;
1744         }
1745
1746         /*
1747          * Avoid a race between SCSI issuing the abort and the device
1748          * completing the command.
1749          *
1750          * If the command is already completed by the fw cmpl code,
1751          * we just return SUCCESS from here. This means that the abort
1752          * succeeded. In the SCSI ML, since the timeout for command has
1753          * happened, the completion wont actually complete the command
1754          * and it will be considered as an aborted command
1755          *
1756          * .io_req will not be cleared except while holding io_req_lock.
1757          */
1758         io_lock = fnic_io_lock_hash(fnic, sc);
1759         spin_lock_irqsave(io_lock, flags);
1760         io_req = fnic_priv(sc)->io_req;
1761         if (!io_req) {
1762                 spin_unlock_irqrestore(io_lock, flags);
1763                 goto fnic_abort_cmd_end;
1764         }
1765
1766         io_req->abts_done = &tm_done;
1767
1768         if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING) {
1769                 spin_unlock_irqrestore(io_lock, flags);
1770                 goto wait_pending;
1771         }
1772
1773         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1774         if (abt_issued_time <= 6000)
1775                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1776         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1777                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1778         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1779                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1780         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1781                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1782         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1783                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1784         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1785                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1786         else
1787                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1788
1789         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1790                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1791         /*
1792          * Command is still pending, need to abort it
1793          * If the firmware completes the command after this point,
1794          * the completion wont be done till mid-layer, since abort
1795          * has already started.
1796          */
1797         old_ioreq_state = fnic_priv(sc)->state;
1798         fnic_priv(sc)->state = FNIC_IOREQ_ABTS_PENDING;
1799         fnic_priv(sc)->abts_status = FCPIO_INVALID_CODE;
1800
1801         spin_unlock_irqrestore(io_lock, flags);
1802
1803         /*
1804          * Check readiness of the remote port. If the path to remote
1805          * port is up, then send abts to the remote port to terminate
1806          * the IO. Else, just locally terminate the IO in the firmware
1807          */
1808         if (fc_remote_port_chkready(rport) == 0)
1809                 task_req = FCPIO_ITMF_ABT_TASK;
1810         else {
1811                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1812                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1813         }
1814
1815         /* Now queue the abort command to firmware */
1816         int_to_scsilun(sc->device->lun, &fc_lun);
1817
1818         if (fnic_queue_abort_io_req(fnic, tag, task_req, fc_lun.scsi_lun,
1819                                     io_req)) {
1820                 spin_lock_irqsave(io_lock, flags);
1821                 if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING)
1822                         fnic_priv(sc)->state = old_ioreq_state;
1823                 io_req = fnic_priv(sc)->io_req;
1824                 if (io_req)
1825                         io_req->abts_done = NULL;
1826                 spin_unlock_irqrestore(io_lock, flags);
1827                 ret = FAILED;
1828                 goto fnic_abort_cmd_end;
1829         }
1830         if (task_req == FCPIO_ITMF_ABT_TASK) {
1831                 fnic_priv(sc)->flags |= FNIC_IO_ABTS_ISSUED;
1832                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1833         } else {
1834                 fnic_priv(sc)->flags |= FNIC_IO_TERM_ISSUED;
1835                 atomic64_inc(&fnic_stats->term_stats.terminates);
1836         }
1837
1838         /*
1839          * We queued an abort IO, wait for its completion.
1840          * Once the firmware completes the abort command, it will
1841          * wake up this thread.
1842          */
1843  wait_pending:
1844         wait_for_completion_timeout(&tm_done,
1845                                     msecs_to_jiffies
1846                                     (2 * fnic->config.ra_tov +
1847                                      fnic->config.ed_tov));
1848
1849         /* Check the abort status */
1850         spin_lock_irqsave(io_lock, flags);
1851
1852         io_req = fnic_priv(sc)->io_req;
1853         if (!io_req) {
1854                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1855                 spin_unlock_irqrestore(io_lock, flags);
1856                 fnic_priv(sc)->flags |= FNIC_IO_ABT_TERM_REQ_NULL;
1857                 ret = FAILED;
1858                 goto fnic_abort_cmd_end;
1859         }
1860         io_req->abts_done = NULL;
1861
1862         /* fw did not complete abort, timed out */
1863         if (fnic_priv(sc)->abts_status == FCPIO_INVALID_CODE) {
1864                 spin_unlock_irqrestore(io_lock, flags);
1865                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1866                         atomic64_inc(&abts_stats->abort_drv_timeouts);
1867                 } else {
1868                         atomic64_inc(&term_stats->terminate_drv_timeouts);
1869                 }
1870                 fnic_priv(sc)->flags |= FNIC_IO_ABT_TERM_TIMED_OUT;
1871                 ret = FAILED;
1872                 goto fnic_abort_cmd_end;
1873         }
1874
1875         /* IO out of order */
1876
1877         if (!(fnic_priv(sc)->flags & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
1878                 spin_unlock_irqrestore(io_lock, flags);
1879                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1880                         "Issuing Host reset due to out of order IO\n");
1881
1882                 ret = FAILED;
1883                 goto fnic_abort_cmd_end;
1884         }
1885
1886         fnic_priv(sc)->state = FNIC_IOREQ_ABTS_COMPLETE;
1887
1888         start_time = io_req->start_time;
1889         /*
1890          * firmware completed the abort, check the status,
1891          * free the io_req if successful. If abort fails,
1892          * Device reset will clean the I/O.
1893          */
1894         if (fnic_priv(sc)->abts_status == FCPIO_SUCCESS) {
1895                 fnic_priv(sc)->io_req = NULL;
1896         } else {
1897                 ret = FAILED;
1898                 spin_unlock_irqrestore(io_lock, flags);
1899                 goto fnic_abort_cmd_end;
1900         }
1901
1902         spin_unlock_irqrestore(io_lock, flags);
1903
1904         fnic_release_ioreq_buf(fnic, io_req, sc);
1905         mempool_free(io_req, fnic->io_req_pool);
1906
1907         /* Call SCSI completion function to complete the IO */
1908         sc->result = DID_ABORT << 16;
1909         scsi_done(sc);
1910         atomic64_dec(&fnic_stats->io_stats.active_ios);
1911         if (atomic64_read(&fnic->io_cmpl_skip))
1912                 atomic64_dec(&fnic->io_cmpl_skip);
1913         else
1914                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1915
1916 fnic_abort_cmd_end:
1917         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no, tag, sc,
1918                   jiffies_to_msecs(jiffies - start_time),
1919                   0, ((u64)sc->cmnd[0] << 32 |
1920                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1921                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1922                   fnic_flags_and_state(sc));
1923
1924         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1925                       "Returning from abort cmd type %x %s\n", task_req,
1926                       (ret == SUCCESS) ?
1927                       "SUCCESS" : "FAILED");
1928         return ret;
1929 }
1930
1931 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
1932                                        struct scsi_cmnd *sc,
1933                                        struct fnic_io_req *io_req)
1934 {
1935         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1936         struct Scsi_Host *host = fnic->lport->host;
1937         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1938         struct scsi_lun fc_lun;
1939         int ret = 0;
1940         unsigned long intr_flags;
1941
1942         spin_lock_irqsave(host->host_lock, intr_flags);
1943         if (unlikely(fnic_chk_state_flags_locked(fnic,
1944                                                 FNIC_FLAGS_IO_BLOCKED))) {
1945                 spin_unlock_irqrestore(host->host_lock, intr_flags);
1946                 return FAILED;
1947         } else
1948                 atomic_inc(&fnic->in_flight);
1949         spin_unlock_irqrestore(host->host_lock, intr_flags);
1950
1951         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
1952
1953         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1954                 free_wq_copy_descs(fnic, wq);
1955
1956         if (!vnic_wq_copy_desc_avail(wq)) {
1957                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1958                           "queue_dr_io_req failure - no descriptors\n");
1959                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
1960                 ret = -EAGAIN;
1961                 goto lr_io_req_end;
1962         }
1963
1964         /* fill in the lun info */
1965         int_to_scsilun(sc->device->lun, &fc_lun);
1966
1967         fnic_queue_wq_copy_desc_itmf(wq, scsi_cmd_to_rq(sc)->tag | FNIC_TAG_DEV_RST,
1968                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
1969                                      fc_lun.scsi_lun, io_req->port_id,
1970                                      fnic->config.ra_tov, fnic->config.ed_tov);
1971
1972         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1973         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1974                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1975                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1976                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1977
1978 lr_io_req_end:
1979         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
1980         atomic_dec(&fnic->in_flight);
1981
1982         return ret;
1983 }
1984
1985 struct fnic_pending_aborts_iter_data {
1986         struct fnic *fnic;
1987         struct scsi_cmnd *lr_sc;
1988         struct scsi_device *lun_dev;
1989         int ret;
1990 };
1991
1992 static bool fnic_pending_aborts_iter(struct scsi_cmnd *sc, void *data)
1993 {
1994         struct fnic_pending_aborts_iter_data *iter_data = data;
1995         struct fnic *fnic = iter_data->fnic;
1996         struct scsi_device *lun_dev = iter_data->lun_dev;
1997         int abt_tag = scsi_cmd_to_rq(sc)->tag;
1998         struct fnic_io_req *io_req;
1999         spinlock_t *io_lock;
2000         unsigned long flags;
2001         struct scsi_lun fc_lun;
2002         DECLARE_COMPLETION_ONSTACK(tm_done);
2003         enum fnic_ioreq_state old_ioreq_state;
2004
2005         if (sc == iter_data->lr_sc || sc->device != lun_dev)
2006                 return true;
2007
2008         io_lock = fnic_io_lock_tag(fnic, abt_tag);
2009         spin_lock_irqsave(io_lock, flags);
2010         io_req = fnic_priv(sc)->io_req;
2011         if (!io_req) {
2012                 spin_unlock_irqrestore(io_lock, flags);
2013                 return true;
2014         }
2015
2016         /*
2017          * Found IO that is still pending with firmware and
2018          * belongs to the LUN that we are resetting
2019          */
2020         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2021                       "Found IO in %s on lun\n",
2022                       fnic_ioreq_state_to_str(fnic_priv(sc)->state));
2023
2024         if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING) {
2025                 spin_unlock_irqrestore(io_lock, flags);
2026                 return true;
2027         }
2028         if ((fnic_priv(sc)->flags & FNIC_DEVICE_RESET) &&
2029             (!(fnic_priv(sc)->flags & FNIC_DEV_RST_ISSUED))) {
2030                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2031                               "%s dev rst not pending sc 0x%p\n", __func__,
2032                               sc);
2033                 spin_unlock_irqrestore(io_lock, flags);
2034                 return true;
2035         }
2036
2037         if (io_req->abts_done)
2038                 shost_printk(KERN_ERR, fnic->lport->host,
2039                              "%s: io_req->abts_done is set state is %s\n",
2040                              __func__, fnic_ioreq_state_to_str(fnic_priv(sc)->state));
2041         old_ioreq_state = fnic_priv(sc)->state;
2042         /*
2043          * Any pending IO issued prior to reset is expected to be
2044          * in abts pending state, if not we need to set
2045          * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2046          * When IO is completed, the IO will be handed over and
2047          * handled in this function.
2048          */
2049         fnic_priv(sc)->state = FNIC_IOREQ_ABTS_PENDING;
2050
2051         BUG_ON(io_req->abts_done);
2052
2053         if (fnic_priv(sc)->flags & FNIC_DEVICE_RESET) {
2054                 abt_tag |= FNIC_TAG_DEV_RST;
2055                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2056                               "%s: dev rst sc 0x%p\n", __func__, sc);
2057         }
2058
2059         fnic_priv(sc)->abts_status = FCPIO_INVALID_CODE;
2060         io_req->abts_done = &tm_done;
2061         spin_unlock_irqrestore(io_lock, flags);
2062
2063         /* Now queue the abort command to firmware */
2064         int_to_scsilun(sc->device->lun, &fc_lun);
2065
2066         if (fnic_queue_abort_io_req(fnic, abt_tag,
2067                                     FCPIO_ITMF_ABT_TASK_TERM,
2068                                     fc_lun.scsi_lun, io_req)) {
2069                 spin_lock_irqsave(io_lock, flags);
2070                 io_req = fnic_priv(sc)->io_req;
2071                 if (io_req)
2072                         io_req->abts_done = NULL;
2073                 if (fnic_priv(sc)->state == FNIC_IOREQ_ABTS_PENDING)
2074                         fnic_priv(sc)->state = old_ioreq_state;
2075                 spin_unlock_irqrestore(io_lock, flags);
2076                 iter_data->ret = FAILED;
2077                 return false;
2078         } else {
2079                 spin_lock_irqsave(io_lock, flags);
2080                 if (fnic_priv(sc)->flags & FNIC_DEVICE_RESET)
2081                         fnic_priv(sc)->flags |= FNIC_DEV_RST_TERM_ISSUED;
2082                 spin_unlock_irqrestore(io_lock, flags);
2083         }
2084         fnic_priv(sc)->flags |= FNIC_IO_INTERNAL_TERM_ISSUED;
2085
2086         wait_for_completion_timeout(&tm_done, msecs_to_jiffies
2087                                     (fnic->config.ed_tov));
2088
2089         /* Recheck cmd state to check if it is now aborted */
2090         spin_lock_irqsave(io_lock, flags);
2091         io_req = fnic_priv(sc)->io_req;
2092         if (!io_req) {
2093                 spin_unlock_irqrestore(io_lock, flags);
2094                 fnic_priv(sc)->flags |= FNIC_IO_ABT_TERM_REQ_NULL;
2095                 return true;
2096         }
2097
2098         io_req->abts_done = NULL;
2099
2100         /* if abort is still pending with fw, fail */
2101         if (fnic_priv(sc)->abts_status == FCPIO_INVALID_CODE) {
2102                 spin_unlock_irqrestore(io_lock, flags);
2103                 fnic_priv(sc)->flags |= FNIC_IO_ABT_TERM_DONE;
2104                 iter_data->ret = FAILED;
2105                 return false;
2106         }
2107         fnic_priv(sc)->state = FNIC_IOREQ_ABTS_COMPLETE;
2108
2109         /* original sc used for lr is handled by dev reset code */
2110         if (sc != iter_data->lr_sc)
2111                 fnic_priv(sc)->io_req = NULL;
2112         spin_unlock_irqrestore(io_lock, flags);
2113
2114         /* original sc used for lr is handled by dev reset code */
2115         if (sc != iter_data->lr_sc) {
2116                 fnic_release_ioreq_buf(fnic, io_req, sc);
2117                 mempool_free(io_req, fnic->io_req_pool);
2118         }
2119
2120         /*
2121          * Any IO is returned during reset, it needs to call scsi_done
2122          * to return the scsi_cmnd to upper layer.
2123          */
2124         /* Set result to let upper SCSI layer retry */
2125         sc->result = DID_RESET << 16;
2126         scsi_done(sc);
2127
2128         return true;
2129 }
2130
2131 /*
2132  * Clean up any pending aborts on the lun
2133  * For each outstanding IO on this lun, whose abort is not completed by fw,
2134  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2135  * successfully aborted, 1 otherwise
2136  */
2137 static int fnic_clean_pending_aborts(struct fnic *fnic,
2138                                      struct scsi_cmnd *lr_sc,
2139                                      bool new_sc)
2140
2141 {
2142         int ret = 0;
2143         struct fnic_pending_aborts_iter_data iter_data = {
2144                 .fnic = fnic,
2145                 .lun_dev = lr_sc->device,
2146                 .ret = SUCCESS,
2147         };
2148
2149         if (new_sc)
2150                 iter_data.lr_sc = lr_sc;
2151
2152         scsi_host_busy_iter(fnic->lport->host,
2153                             fnic_pending_aborts_iter, &iter_data);
2154         if (iter_data.ret == FAILED) {
2155                 ret = iter_data.ret;
2156                 goto clean_pending_aborts_end;
2157         }
2158         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2159
2160         /* walk again to check, if IOs are still pending in fw */
2161         if (fnic_is_abts_pending(fnic, lr_sc))
2162                 ret = 1;
2163
2164 clean_pending_aborts_end:
2165         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2166                         "%s: exit status: %d\n", __func__, ret);
2167         return ret;
2168 }
2169
2170 /*
2171  * fnic_scsi_host_start_tag
2172  * Allocates tagid from host's tag list
2173  **/
2174 static inline int
2175 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2176 {
2177         struct request *rq = scsi_cmd_to_rq(sc);
2178         struct request_queue *q = rq->q;
2179         struct request *dummy;
2180
2181         dummy = blk_mq_alloc_request(q, REQ_OP_WRITE, BLK_MQ_REQ_NOWAIT);
2182         if (IS_ERR(dummy))
2183                 return SCSI_NO_TAG;
2184
2185         rq->tag = dummy->tag;
2186         sc->host_scribble = (unsigned char *)dummy;
2187
2188         return dummy->tag;
2189 }
2190
2191 /*
2192  * fnic_scsi_host_end_tag
2193  * frees tag allocated by fnic_scsi_host_start_tag.
2194  **/
2195 static inline void
2196 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2197 {
2198         struct request *dummy = (struct request *)sc->host_scribble;
2199
2200         blk_mq_free_request(dummy);
2201 }
2202
2203 /*
2204  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2205  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2206  * on the LUN.
2207  */
2208 int fnic_device_reset(struct scsi_cmnd *sc)
2209 {
2210         struct request *rq = scsi_cmd_to_rq(sc);
2211         struct fc_lport *lp;
2212         struct fnic *fnic;
2213         struct fnic_io_req *io_req = NULL;
2214         struct fc_rport *rport;
2215         int status;
2216         int ret = FAILED;
2217         spinlock_t *io_lock;
2218         unsigned long flags;
2219         unsigned long start_time = 0;
2220         struct scsi_lun fc_lun;
2221         struct fnic_stats *fnic_stats;
2222         struct reset_stats *reset_stats;
2223         int tag = rq->tag;
2224         DECLARE_COMPLETION_ONSTACK(tm_done);
2225         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2226         bool new_sc = 0;
2227
2228         /* Wait for rport to unblock */
2229         fc_block_scsi_eh(sc);
2230
2231         /* Get local-port, check ready and link up */
2232         lp = shost_priv(sc->device->host);
2233
2234         fnic = lport_priv(lp);
2235         fnic_stats = &fnic->fnic_stats;
2236         reset_stats = &fnic->fnic_stats.reset_stats;
2237
2238         atomic64_inc(&reset_stats->device_resets);
2239
2240         rport = starget_to_rport(scsi_target(sc->device));
2241         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2242                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2243                       rport->port_id, sc->device->lun, sc);
2244
2245         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2246                 goto fnic_device_reset_end;
2247
2248         /* Check if remote port up */
2249         if (fc_remote_port_chkready(rport)) {
2250                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2251                 goto fnic_device_reset_end;
2252         }
2253
2254         fnic_priv(sc)->flags = FNIC_DEVICE_RESET;
2255         /* Allocate tag if not present */
2256
2257         if (unlikely(tag < 0)) {
2258                 /*
2259                  * Really should fix the midlayer to pass in a proper
2260                  * request for ioctls...
2261                  */
2262                 tag = fnic_scsi_host_start_tag(fnic, sc);
2263                 if (unlikely(tag == SCSI_NO_TAG))
2264                         goto fnic_device_reset_end;
2265                 tag_gen_flag = 1;
2266                 new_sc = 1;
2267         }
2268         io_lock = fnic_io_lock_hash(fnic, sc);
2269         spin_lock_irqsave(io_lock, flags);
2270         io_req = fnic_priv(sc)->io_req;
2271
2272         /*
2273          * If there is a io_req attached to this command, then use it,
2274          * else allocate a new one.
2275          */
2276         if (!io_req) {
2277                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2278                 if (!io_req) {
2279                         spin_unlock_irqrestore(io_lock, flags);
2280                         goto fnic_device_reset_end;
2281                 }
2282                 memset(io_req, 0, sizeof(*io_req));
2283                 io_req->port_id = rport->port_id;
2284                 fnic_priv(sc)->io_req = io_req;
2285         }
2286         io_req->dr_done = &tm_done;
2287         fnic_priv(sc)->state = FNIC_IOREQ_CMD_PENDING;
2288         fnic_priv(sc)->lr_status = FCPIO_INVALID_CODE;
2289         spin_unlock_irqrestore(io_lock, flags);
2290
2291         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2292
2293         /*
2294          * issue the device reset, if enqueue failed, clean up the ioreq
2295          * and break assoc with scsi cmd
2296          */
2297         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2298                 spin_lock_irqsave(io_lock, flags);
2299                 io_req = fnic_priv(sc)->io_req;
2300                 if (io_req)
2301                         io_req->dr_done = NULL;
2302                 goto fnic_device_reset_clean;
2303         }
2304         spin_lock_irqsave(io_lock, flags);
2305         fnic_priv(sc)->flags |= FNIC_DEV_RST_ISSUED;
2306         spin_unlock_irqrestore(io_lock, flags);
2307
2308         /*
2309          * Wait on the local completion for LUN reset.  The io_req may be
2310          * freed while we wait since we hold no lock.
2311          */
2312         wait_for_completion_timeout(&tm_done,
2313                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2314
2315         spin_lock_irqsave(io_lock, flags);
2316         io_req = fnic_priv(sc)->io_req;
2317         if (!io_req) {
2318                 spin_unlock_irqrestore(io_lock, flags);
2319                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2320                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2321                 goto fnic_device_reset_end;
2322         }
2323         io_req->dr_done = NULL;
2324
2325         status = fnic_priv(sc)->lr_status;
2326
2327         /*
2328          * If lun reset not completed, bail out with failed. io_req
2329          * gets cleaned up during higher levels of EH
2330          */
2331         if (status == FCPIO_INVALID_CODE) {
2332                 atomic64_inc(&reset_stats->device_reset_timeouts);
2333                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2334                               "Device reset timed out\n");
2335                 fnic_priv(sc)->flags |= FNIC_DEV_RST_TIMED_OUT;
2336                 spin_unlock_irqrestore(io_lock, flags);
2337                 int_to_scsilun(sc->device->lun, &fc_lun);
2338                 /*
2339                  * Issue abort and terminate on device reset request.
2340                  * If q'ing of terminate fails, retry it after a delay.
2341                  */
2342                 while (1) {
2343                         spin_lock_irqsave(io_lock, flags);
2344                         if (fnic_priv(sc)->flags & FNIC_DEV_RST_TERM_ISSUED) {
2345                                 spin_unlock_irqrestore(io_lock, flags);
2346                                 break;
2347                         }
2348                         spin_unlock_irqrestore(io_lock, flags);
2349                         if (fnic_queue_abort_io_req(fnic,
2350                                 tag | FNIC_TAG_DEV_RST,
2351                                 FCPIO_ITMF_ABT_TASK_TERM,
2352                                 fc_lun.scsi_lun, io_req)) {
2353                                 wait_for_completion_timeout(&tm_done,
2354                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2355                         } else {
2356                                 spin_lock_irqsave(io_lock, flags);
2357                                 fnic_priv(sc)->flags |= FNIC_DEV_RST_TERM_ISSUED;
2358                                 fnic_priv(sc)->state = FNIC_IOREQ_ABTS_PENDING;
2359                                 io_req->abts_done = &tm_done;
2360                                 spin_unlock_irqrestore(io_lock, flags);
2361                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2362                                 "Abort and terminate issued on Device reset "
2363                                 "tag 0x%x sc 0x%p\n", tag, sc);
2364                                 break;
2365                         }
2366                 }
2367                 while (1) {
2368                         spin_lock_irqsave(io_lock, flags);
2369                         if (!(fnic_priv(sc)->flags & FNIC_DEV_RST_DONE)) {
2370                                 spin_unlock_irqrestore(io_lock, flags);
2371                                 wait_for_completion_timeout(&tm_done,
2372                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2373                                 break;
2374                         } else {
2375                                 io_req = fnic_priv(sc)->io_req;
2376                                 io_req->abts_done = NULL;
2377                                 goto fnic_device_reset_clean;
2378                         }
2379                 }
2380         } else {
2381                 spin_unlock_irqrestore(io_lock, flags);
2382         }
2383
2384         /* Completed, but not successful, clean up the io_req, return fail */
2385         if (status != FCPIO_SUCCESS) {
2386                 spin_lock_irqsave(io_lock, flags);
2387                 FNIC_SCSI_DBG(KERN_DEBUG,
2388                               fnic->lport->host,
2389                               "Device reset completed - failed\n");
2390                 io_req = fnic_priv(sc)->io_req;
2391                 goto fnic_device_reset_clean;
2392         }
2393
2394         /*
2395          * Clean up any aborts on this lun that have still not
2396          * completed. If any of these fail, then LUN reset fails.
2397          * clean_pending_aborts cleans all cmds on this lun except
2398          * the lun reset cmd. If all cmds get cleaned, the lun reset
2399          * succeeds
2400          */
2401         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2402                 spin_lock_irqsave(io_lock, flags);
2403                 io_req = fnic_priv(sc)->io_req;
2404                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2405                               "Device reset failed"
2406                               " since could not abort all IOs\n");
2407                 goto fnic_device_reset_clean;
2408         }
2409
2410         /* Clean lun reset command */
2411         spin_lock_irqsave(io_lock, flags);
2412         io_req = fnic_priv(sc)->io_req;
2413         if (io_req)
2414                 /* Completed, and successful */
2415                 ret = SUCCESS;
2416
2417 fnic_device_reset_clean:
2418         if (io_req)
2419                 fnic_priv(sc)->io_req = NULL;
2420
2421         spin_unlock_irqrestore(io_lock, flags);
2422
2423         if (io_req) {
2424                 start_time = io_req->start_time;
2425                 fnic_release_ioreq_buf(fnic, io_req, sc);
2426                 mempool_free(io_req, fnic->io_req_pool);
2427         }
2428
2429 fnic_device_reset_end:
2430         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no, rq->tag, sc,
2431                   jiffies_to_msecs(jiffies - start_time),
2432                   0, ((u64)sc->cmnd[0] << 32 |
2433                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2434                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2435                   fnic_flags_and_state(sc));
2436
2437         /* free tag if it is allocated */
2438         if (unlikely(tag_gen_flag))
2439                 fnic_scsi_host_end_tag(fnic, sc);
2440
2441         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2442                       "Returning from device reset %s\n",
2443                       (ret == SUCCESS) ?
2444                       "SUCCESS" : "FAILED");
2445
2446         if (ret == FAILED)
2447                 atomic64_inc(&reset_stats->device_reset_failures);
2448
2449         return ret;
2450 }
2451
2452 /* Clean up all IOs, clean up libFC local port */
2453 int fnic_reset(struct Scsi_Host *shost)
2454 {
2455         struct fc_lport *lp;
2456         struct fnic *fnic;
2457         int ret = 0;
2458         struct reset_stats *reset_stats;
2459
2460         lp = shost_priv(shost);
2461         fnic = lport_priv(lp);
2462         reset_stats = &fnic->fnic_stats.reset_stats;
2463
2464         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2465                       "fnic_reset called\n");
2466
2467         atomic64_inc(&reset_stats->fnic_resets);
2468
2469         /*
2470          * Reset local port, this will clean up libFC exchanges,
2471          * reset remote port sessions, and if link is up, begin flogi
2472          */
2473         ret = fc_lport_reset(lp);
2474
2475         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2476                       "Returning from fnic reset %s\n",
2477                       (ret == 0) ?
2478                       "SUCCESS" : "FAILED");
2479
2480         if (ret == 0)
2481                 atomic64_inc(&reset_stats->fnic_reset_completions);
2482         else
2483                 atomic64_inc(&reset_stats->fnic_reset_failures);
2484
2485         return ret;
2486 }
2487
2488 /*
2489  * SCSI Error handling calls driver's eh_host_reset if all prior
2490  * error handling levels return FAILED. If host reset completes
2491  * successfully, and if link is up, then Fabric login begins.
2492  *
2493  * Host Reset is the highest level of error recovery. If this fails, then
2494  * host is offlined by SCSI.
2495  *
2496  */
2497 int fnic_host_reset(struct scsi_cmnd *sc)
2498 {
2499         int ret;
2500         unsigned long wait_host_tmo;
2501         struct Scsi_Host *shost = sc->device->host;
2502         struct fc_lport *lp = shost_priv(shost);
2503         struct fnic *fnic = lport_priv(lp);
2504         unsigned long flags;
2505
2506         spin_lock_irqsave(&fnic->fnic_lock, flags);
2507         if (!fnic->internal_reset_inprogress) {
2508                 fnic->internal_reset_inprogress = true;
2509         } else {
2510                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2511                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2512                         "host reset in progress skipping another host reset\n");
2513                 return SUCCESS;
2514         }
2515         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2516
2517         /*
2518          * If fnic_reset is successful, wait for fabric login to complete
2519          * scsi-ml tries to send a TUR to every device if host reset is
2520          * successful, so before returning to scsi, fabric should be up
2521          */
2522         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2523         if (ret == SUCCESS) {
2524                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2525                 ret = FAILED;
2526                 while (time_before(jiffies, wait_host_tmo)) {
2527                         if ((lp->state == LPORT_ST_READY) &&
2528                             (lp->link_up)) {
2529                                 ret = SUCCESS;
2530                                 break;
2531                         }
2532                         ssleep(1);
2533                 }
2534         }
2535
2536         spin_lock_irqsave(&fnic->fnic_lock, flags);
2537         fnic->internal_reset_inprogress = false;
2538         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2539         return ret;
2540 }
2541
2542 /*
2543  * This fxn is called from libFC when host is removed
2544  */
2545 void fnic_scsi_abort_io(struct fc_lport *lp)
2546 {
2547         int err = 0;
2548         unsigned long flags;
2549         enum fnic_state old_state;
2550         struct fnic *fnic = lport_priv(lp);
2551         DECLARE_COMPLETION_ONSTACK(remove_wait);
2552
2553         /* Issue firmware reset for fnic, wait for reset to complete */
2554 retry_fw_reset:
2555         spin_lock_irqsave(&fnic->fnic_lock, flags);
2556         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) &&
2557                      fnic->link_events) {
2558                 /* fw reset is in progress, poll for its completion */
2559                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2560                 schedule_timeout(msecs_to_jiffies(100));
2561                 goto retry_fw_reset;
2562         }
2563
2564         fnic->remove_wait = &remove_wait;
2565         old_state = fnic->state;
2566         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2567         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2568         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2569
2570         err = fnic_fw_reset_handler(fnic);
2571         if (err) {
2572                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2573                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2574                         fnic->state = old_state;
2575                 fnic->remove_wait = NULL;
2576                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2577                 return;
2578         }
2579
2580         /* Wait for firmware reset to complete */
2581         wait_for_completion_timeout(&remove_wait,
2582                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2583
2584         spin_lock_irqsave(&fnic->fnic_lock, flags);
2585         fnic->remove_wait = NULL;
2586         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2587                       "fnic_scsi_abort_io %s\n",
2588                       (fnic->state == FNIC_IN_ETH_MODE) ?
2589                       "SUCCESS" : "FAILED");
2590         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2591
2592 }
2593
2594 /*
2595  * This fxn called from libFC to clean up driver IO state on link down
2596  */
2597 void fnic_scsi_cleanup(struct fc_lport *lp)
2598 {
2599         unsigned long flags;
2600         enum fnic_state old_state;
2601         struct fnic *fnic = lport_priv(lp);
2602
2603         /* issue fw reset */
2604 retry_fw_reset:
2605         spin_lock_irqsave(&fnic->fnic_lock, flags);
2606         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2607                 /* fw reset is in progress, poll for its completion */
2608                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2609                 schedule_timeout(msecs_to_jiffies(100));
2610                 goto retry_fw_reset;
2611         }
2612         old_state = fnic->state;
2613         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2614         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2615         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2616
2617         if (fnic_fw_reset_handler(fnic)) {
2618                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2619                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2620                         fnic->state = old_state;
2621                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2622         }
2623
2624 }
2625
2626 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2627 {
2628 }
2629
2630 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2631 {
2632         struct fnic *fnic = lport_priv(lp);
2633
2634         /* Non-zero sid, nothing to do */
2635         if (sid)
2636                 goto call_fc_exch_mgr_reset;
2637
2638         if (did) {
2639                 fnic_rport_exch_reset(fnic, did);
2640                 goto call_fc_exch_mgr_reset;
2641         }
2642
2643         /*
2644          * sid = 0, did = 0
2645          * link down or device being removed
2646          */
2647         if (!fnic->in_remove)
2648                 fnic_scsi_cleanup(lp);
2649         else
2650                 fnic_scsi_abort_io(lp);
2651
2652         /* call libFC exch mgr reset to reset its exchanges */
2653 call_fc_exch_mgr_reset:
2654         fc_exch_mgr_reset(lp, sid, did);
2655
2656 }
2657
2658 static bool fnic_abts_pending_iter(struct scsi_cmnd *sc, void *data)
2659 {
2660         struct fnic_pending_aborts_iter_data *iter_data = data;
2661         struct fnic *fnic = iter_data->fnic;
2662         int cmd_state;
2663         struct fnic_io_req *io_req;
2664         spinlock_t *io_lock;
2665         unsigned long flags;
2666
2667         /*
2668          * ignore this lun reset cmd or cmds that do not belong to
2669          * this lun
2670          */
2671         if (iter_data->lr_sc && sc == iter_data->lr_sc)
2672                 return true;
2673         if (iter_data->lun_dev && sc->device != iter_data->lun_dev)
2674                 return true;
2675
2676         io_lock = fnic_io_lock_hash(fnic, sc);
2677         spin_lock_irqsave(io_lock, flags);
2678
2679         io_req = fnic_priv(sc)->io_req;
2680         if (!io_req) {
2681                 spin_unlock_irqrestore(io_lock, flags);
2682                 return true;
2683         }
2684
2685         /*
2686          * Found IO that is still pending with firmware and
2687          * belongs to the LUN that we are resetting
2688          */
2689         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2690                       "Found IO in %s on lun\n",
2691                       fnic_ioreq_state_to_str(fnic_priv(sc)->state));
2692         cmd_state = fnic_priv(sc)->state;
2693         spin_unlock_irqrestore(io_lock, flags);
2694         if (cmd_state == FNIC_IOREQ_ABTS_PENDING)
2695                 iter_data->ret = 1;
2696
2697         return iter_data->ret ? false : true;
2698 }
2699
2700 /*
2701  * fnic_is_abts_pending() is a helper function that
2702  * walks through tag map to check if there is any IOs pending,if there is one,
2703  * then it returns 1 (true), otherwise 0 (false)
2704  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2705  * otherwise, it checks for all IOs.
2706  */
2707 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2708 {
2709         struct fnic_pending_aborts_iter_data iter_data = {
2710                 .fnic = fnic,
2711                 .lun_dev = NULL,
2712                 .ret = 0,
2713         };
2714
2715         if (lr_sc) {
2716                 iter_data.lun_dev = lr_sc->device;
2717                 iter_data.lr_sc = lr_sc;
2718         }
2719
2720         /* walk again to check, if IOs are still pending in fw */
2721         scsi_host_busy_iter(fnic->lport->host,
2722                             fnic_abts_pending_iter, &iter_data);
2723
2724         return iter_data.ret;
2725 }