drivers/scsi/fnic/fnic_scsi.c

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