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