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/etherdevice.h>
  27 #include <linux/if_ether.h>
  28 #include <linux/if_vlan.h>
  29 #include <linux/delay.h>
  30 #include <linux/gfp.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_host.h>
  33 #include <scsi/scsi_device.h>
  34 #include <scsi/scsi_cmnd.h>
  35 #include <scsi/scsi_tcq.h>
  36 #include <scsi/fc/fc_els.h>
  37 #include <scsi/fc/fc_fcoe.h>
  38 #include <scsi/libfc.h>
  39 #include <scsi/fc_frame.h>
  40 #include "fnic_io.h"
  41 #include "fnic.h"
  42
  43 const char *fnic_state_str[] = {
  44         [FNIC_IN_FC_MODE] =           "FNIC_IN_FC_MODE",
  45         [FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
  46         [FNIC_IN_ETH_MODE] =          "FNIC_IN_ETH_MODE",
  47         [FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
  48 };
  49
  50 static const char *fnic_ioreq_state_str[] = {
  51         [FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED",
  52         [FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
  53         [FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
  54         [FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
  55         [FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
  56 };
  57
  58 static const char *fcpio_status_str[] =  {
  59         [FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
  60         [FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
  61         [FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
  62         [FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
  63         [FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
  64         [FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
  65         [FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
  66         [FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
  67         [FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
  68         [FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
  69         [FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
  70         [FCPIO_FW_ERR] = "FCPIO_FW_ERR",
  71         [FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
  72         [FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
  73         [FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
  74         [FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
  75         [FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
  76         [FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
  77         [FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
  78 };
  79
  80 const char *fnic_state_to_str(unsigned int state)
  81 {
  82         if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
  83                 return "unknown";
  84
  85         return fnic_state_str[state];
  86 }
  87
  88 static const char *fnic_ioreq_state_to_str(unsigned int state)
  89 {
  90         if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
  91             !fnic_ioreq_state_str[state])
  92                 return "unknown";
  93
  94         return fnic_ioreq_state_str[state];
  95 }
  96
  97 static const char *fnic_fcpio_status_to_str(unsigned int status)
  98 {
  99         if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
 100                 return "unknown";
 101
 102         return fcpio_status_str[status];
 103 }
 104
 105 static void fnic_cleanup_io(struct fnic *fnic);
 106
 107 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
 108                                             struct scsi_cmnd *sc)
 109 {
 110         u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1);
 111
 112         return &fnic->io_req_lock[hash];
 113 }
 114
 115 static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic,
 116                                             int tag)
 117 {
 118         return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)];
 119 }
 120
 121 /*
 122  * Unmap the data buffer and sense buffer for an io_req,
 123  * also unmap and free the device-private scatter/gather list.
 124  */
 125 static void fnic_release_ioreq_buf(struct fnic *fnic,
 126                                    struct fnic_io_req *io_req,
 127                                    struct scsi_cmnd *sc)
 128 {
 129         if (io_req->sgl_list_pa)
 130                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 131                                  sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
 132                                  DMA_TO_DEVICE);
 133         scsi_dma_unmap(sc);
 134
 135         if (io_req->sgl_cnt)
 136                 mempool_free(io_req->sgl_list_alloc,
 137                              fnic->io_sgl_pool[io_req->sgl_type]);
 138         if (io_req->sense_buf_pa)
 139                 dma_unmap_single(&fnic->pdev->dev, io_req->sense_buf_pa,
 140                                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 141 }
 142
 143 /* Free up Copy Wq descriptors. Called with copy_wq lock held */
 144 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
 145 {
 146         /* if no Ack received from firmware, then nothing to clean */
 147         if (!fnic->fw_ack_recd[0])
 148                 return 1;
 149
 150         /*
 151          * Update desc_available count based on number of freed descriptors
 152          * Account for wraparound
 153          */
 154         if (wq->to_clean_index <= fnic->fw_ack_index[0])
 155                 wq->ring.desc_avail += (fnic->fw_ack_index[0]
 156                                         - wq->to_clean_index + 1);
 157         else
 158                 wq->ring.desc_avail += (wq->ring.desc_count
 159                                         - wq->to_clean_index
 160                                         + fnic->fw_ack_index[0] + 1);
 161
 162         /*
 163          * just bump clean index to ack_index+1 accounting for wraparound
 164          * this will essentially free up all descriptors between
 165          * to_clean_index and fw_ack_index, both inclusive
 166          */
 167         wq->to_clean_index =
 168                 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
 169
 170         /* we have processed the acks received so far */
 171         fnic->fw_ack_recd[0] = 0;
 172         return 0;
 173 }
 174
 175
 176 /*
 177  * __fnic_set_state_flags
 178  * Sets/Clears bits in fnic's state_flags
 179  **/
 180 void
 181 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
 182                         unsigned long clearbits)
 183 {
 184         unsigned long flags = 0;
 185         unsigned long host_lock_flags = 0;
 186
 187         spin_lock_irqsave(&fnic->fnic_lock, flags);
 188         spin_lock_irqsave(fnic->lport->host->host_lock, host_lock_flags);
 189
 190         if (clearbits)
 191                 fnic->state_flags &= ~st_flags;
 192         else
 193                 fnic->state_flags |= st_flags;
 194
 195         spin_unlock_irqrestore(fnic->lport->host->host_lock, host_lock_flags);
 196         spin_unlock_irqrestore(&fnic->fnic_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                 eth_broadcast_addr(gw_mac);
 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 = dma_map_single(&fnic->pdev->dev,
 345                                 io_req->sgl_list,
 346                                 sizeof(io_req->sgl_list[0]) * sg_count,
 347                                 DMA_TO_DEVICE);
 348                 if (dma_mapping_error(&fnic->pdev->dev, io_req->sgl_list_pa)) {
 349                         printk(KERN_ERR "DMA mapping failed\n");
 350                         return SCSI_MLQUEUE_HOST_BUSY;
 351                 }
 352         }
 353
 354         io_req->sense_buf_pa = dma_map_single(&fnic->pdev->dev,
 355                                               sc->sense_buffer,
 356                                               SCSI_SENSE_BUFFERSIZE,
 357                                               DMA_FROM_DEVICE);
 358         if (dma_mapping_error(&fnic->pdev->dev, io_req->sense_buf_pa)) {
 359                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 360                                 sizeof(io_req->sgl_list[0]) * sg_count,
 361                                 DMA_TO_DEVICE);
 362                 printk(KERN_ERR "DMA mapping failed\n");
 363                 return SCSI_MLQUEUE_HOST_BUSY;
 364         }
 365
 366         int_to_scsilun(sc->device->lun, &fc_lun);
 367
 368         /* Enqueue the descriptor in the Copy WQ */
 369         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
 370
 371         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 372                 free_wq_copy_descs(fnic, wq);
 373
 374         if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
 375                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 376                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 377                           "fnic_queue_wq_copy_desc failure - no descriptors\n");
 378                 atomic64_inc(&misc_stats->io_cpwq_alloc_failures);
 379                 return SCSI_MLQUEUE_HOST_BUSY;
 380         }
 381
 382         flags = 0;
 383         if (sc->sc_data_direction == DMA_FROM_DEVICE)
 384                 flags = FCPIO_ICMND_RDDATA;
 385         else if (sc->sc_data_direction == DMA_TO_DEVICE)
 386                 flags = FCPIO_ICMND_WRDATA;
 387
 388         exch_flags = 0;
 389         if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
 390             (rp->flags & FC_RP_FLAGS_RETRY))
 391                 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
 392
 393         fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
 394                                          0, exch_flags, io_req->sgl_cnt,
 395                                          SCSI_SENSE_BUFFERSIZE,
 396                                          io_req->sgl_list_pa,
 397                                          io_req->sense_buf_pa,
 398                                          0, /* scsi cmd ref, always 0 */
 399                                          FCPIO_ICMND_PTA_SIMPLE,
 400                                                 /* scsi pri and tag */
 401                                          flags, /* command flags */
 402                                          sc->cmnd, sc->cmd_len,
 403                                          scsi_bufflen(sc),
 404                                          fc_lun.scsi_lun, io_req->port_id,
 405                                          rport->maxframe_size, rp->r_a_tov,
 406                                          rp->e_d_tov);
 407
 408         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 409         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 410                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 411                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 412                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 413
 414         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 415         return 0;
 416 }
 417
 418 /*
 419  * fnic_queuecommand
 420  * Routine to send a scsi cdb
 421  * Called with host_lock held and interrupts disabled.
 422  */
 423 static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 424 {
 425         struct fc_lport *lp = shost_priv(sc->device->host);
 426         struct fc_rport *rport;
 427         struct fnic_io_req *io_req = NULL;
 428         struct fnic *fnic = lport_priv(lp);
 429         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 430         struct vnic_wq_copy *wq;
 431         int ret;
 432         u64 cmd_trace;
 433         int sg_count = 0;
 434         unsigned long flags = 0;
 435         unsigned long ptr;
 436         spinlock_t *io_lock = NULL;
 437         int io_lock_acquired = 0;
 438         struct fc_rport_libfc_priv *rp;
 439
 440         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
 441                 return SCSI_MLQUEUE_HOST_BUSY;
 442
 443         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_FWRESET)))
 444                 return SCSI_MLQUEUE_HOST_BUSY;
 445
 446         rport = starget_to_rport(scsi_target(sc->device));
 447         if (!rport) {
 448                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 449                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 450                 sc->result = DID_NO_CONNECT << 16;
 451                 done(sc);
 452                 return 0;
 453         }
 454
 455         ret = fc_remote_port_chkready(rport);
 456         if (ret) {
 457                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 458                                 "rport is not ready\n");
 459                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 460                 sc->result = ret;
 461                 done(sc);
 462                 return 0;
 463         }
 464
 465         rp = rport->dd_data;
 466         if (!rp || rp->rp_state == RPORT_ST_DELETE) {
 467                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 468                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 469                         rport->port_id);
 470
 471                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 472                 sc->result = DID_NO_CONNECT<<16;
 473                 done(sc);
 474                 return 0;
 475         }
 476
 477         if (rp->rp_state != RPORT_ST_READY) {
 478                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 479                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 480                         rport->port_id, rp->rp_state);
 481
 482                 sc->result = DID_IMM_RETRY << 16;
 483                 done(sc);
 484                 return 0;
 485         }
 486
 487         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 488                 return SCSI_MLQUEUE_HOST_BUSY;
 489
 490         atomic_inc(&fnic->in_flight);
 491
 492         /*
 493          * Release host lock, use driver resource specific locks from here.
 494          * Don't re-enable interrupts in case they were disabled prior to the
 495          * caller disabling them.
 496          */
 497         spin_unlock(lp->host->host_lock);
 498         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 499         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 500
 501         /* Get a new io_req for this SCSI IO */
 502         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 503         if (!io_req) {
 504                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 505                 ret = SCSI_MLQUEUE_HOST_BUSY;
 506                 goto out;
 507         }
 508         memset(io_req, 0, sizeof(*io_req));
 509
 510         /* Map the data buffer */
 511         sg_count = scsi_dma_map(sc);
 512         if (sg_count < 0) {
 513                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 514                           sc->request->tag, sc, 0, sc->cmnd[0],
 515                           sg_count, CMD_STATE(sc));
 516                 mempool_free(io_req, fnic->io_req_pool);
 517                 goto out;
 518         }
 519
 520         /* Determine the type of scatter/gather list we need */
 521         io_req->sgl_cnt = sg_count;
 522         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 523         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 524                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 525
 526         if (sg_count) {
 527                 io_req->sgl_list =
 528                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 529                                       GFP_ATOMIC);
 530                 if (!io_req->sgl_list) {
 531                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 532                         ret = SCSI_MLQUEUE_HOST_BUSY;
 533                         scsi_dma_unmap(sc);
 534                         mempool_free(io_req, fnic->io_req_pool);
 535                         goto out;
 536                 }
 537
 538                 /* Cache sgl list allocated address before alignment */
 539                 io_req->sgl_list_alloc = io_req->sgl_list;
 540                 ptr = (unsigned long) io_req->sgl_list;
 541                 if (ptr % FNIC_SG_DESC_ALIGN) {
 542                         io_req->sgl_list = (struct host_sg_desc *)
 543                                 (((unsigned long) ptr
 544                                   + FNIC_SG_DESC_ALIGN - 1)
 545                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 546                 }
 547         }
 548
 549         /*
 550         * Will acquire lock defore setting to IO initialized.
 551         */
 552
 553         io_lock = fnic_io_lock_hash(fnic, sc);
 554         spin_lock_irqsave(io_lock, flags);
 555
 556         /* initialize rest of io_req */
 557         io_lock_acquired = 1;
 558         io_req->port_id = rport->port_id;
 559         io_req->start_time = jiffies;
 560         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 561         CMD_SP(sc) = (char *)io_req;
 562         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 563         sc->scsi_done = done;
 564
 565         /* create copy wq desc and enqueue it */
 566         wq = &fnic->wq_copy[0];
 567         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 568         if (ret) {
 569                 /*
 570                  * In case another thread cancelled the request,
 571                  * refetch the pointer under the lock.
 572                  */
 573                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 574                           sc->request->tag, sc, 0, 0, 0,
 575                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 576                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 577                 CMD_SP(sc) = NULL;
 578                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 579                 spin_unlock_irqrestore(io_lock, flags);
 580                 if (io_req) {
 581                         fnic_release_ioreq_buf(fnic, io_req, sc);
 582                         mempool_free(io_req, fnic->io_req_pool);
 583                 }
 584                 atomic_dec(&fnic->in_flight);
 585                 /* acquire host lock before returning to SCSI */
 586                 spin_lock(lp->host->host_lock);
 587                 return ret;
 588         } else {
 589                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 590                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 591                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 592                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 593                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 594                              atomic64_read(&fnic_stats->io_stats.active_ios));
 595
 596                 /* REVISIT: Use per IO lock in the final code */
 597                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 598         }
 599 out:
 600         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 601                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 602                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 603                         sc->cmnd[5]);
 604
 605         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 606                   sc->request->tag, sc, io_req,
 607                   sg_count, cmd_trace,
 608                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 609
 610         /* if only we issued IO, will we have the io lock */
 611         if (io_lock_acquired)
 612                 spin_unlock_irqrestore(io_lock, flags);
 613
 614         atomic_dec(&fnic->in_flight);
 615         /* acquire host lock before returning to SCSI */
 616         spin_lock(lp->host->host_lock);
 617         return ret;
 618 }
 619
 620 DEF_SCSI_QCMD(fnic_queuecommand)
 621
 622 /*
 623  * fnic_fcpio_fw_reset_cmpl_handler
 624  * Routine to handle fw reset completion
 625  */
 626 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 627                                             struct fcpio_fw_req *desc)
 628 {
 629         u8 type;
 630         u8 hdr_status;
 631         struct fcpio_tag tag;
 632         int ret = 0;
 633         unsigned long flags;
 634         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 635
 636         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 637
 638         atomic64_inc(&reset_stats->fw_reset_completions);
 639
 640         /* Clean up all outstanding io requests */
 641         fnic_cleanup_io(fnic);
 642
 643         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 644         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 645         atomic64_set(&fnic->io_cmpl_skip, 0);
 646
 647         spin_lock_irqsave(&fnic->fnic_lock, flags);
 648
 649         /* fnic should be in FC_TRANS_ETH_MODE */
 650         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 651                 /* Check status of reset completion */
 652                 if (!hdr_status) {
 653                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 654                                       "reset cmpl success\n");
 655                         /* Ready to send flogi out */
 656                         fnic->state = FNIC_IN_ETH_MODE;
 657                 } else {
 658                         FNIC_SCSI_DBG(KERN_DEBUG,
 659                                       fnic->lport->host,
 660                                       "fnic fw_reset : failed %s\n",
 661                                       fnic_fcpio_status_to_str(hdr_status));
 662
 663                         /*
 664                          * Unable to change to eth mode, cannot send out flogi
 665                          * Change state to fc mode, so that subsequent Flogi
 666                          * requests from libFC will cause more attempts to
 667                          * reset the firmware. Free the cached flogi
 668                          */
 669                         fnic->state = FNIC_IN_FC_MODE;
 670                         atomic64_inc(&reset_stats->fw_reset_failures);
 671                         ret = -1;
 672                 }
 673         } else {
 674                 FNIC_SCSI_DBG(KERN_DEBUG,
 675                               fnic->lport->host,
 676                               "Unexpected state %s while processing"
 677                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 678                 atomic64_inc(&reset_stats->fw_reset_failures);
 679                 ret = -1;
 680         }
 681
 682         /* Thread removing device blocks till firmware reset is complete */
 683         if (fnic->remove_wait)
 684                 complete(fnic->remove_wait);
 685
 686         /*
 687          * If fnic is being removed, or fw reset failed
 688          * free the flogi frame. Else, send it out
 689          */
 690         if (fnic->remove_wait || ret) {
 691                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 692                 skb_queue_purge(&fnic->tx_queue);
 693                 goto reset_cmpl_handler_end;
 694         }
 695
 696         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 697
 698         fnic_flush_tx(fnic);
 699
 700  reset_cmpl_handler_end:
 701         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 702
 703         return ret;
 704 }
 705
 706 /*
 707  * fnic_fcpio_flogi_reg_cmpl_handler
 708  * Routine to handle flogi register completion
 709  */
 710 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 711                                              struct fcpio_fw_req *desc)
 712 {
 713         u8 type;
 714         u8 hdr_status;
 715         struct fcpio_tag tag;
 716         int ret = 0;
 717         unsigned long flags;
 718
 719         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 720
 721         /* Update fnic state based on status of flogi reg completion */
 722         spin_lock_irqsave(&fnic->fnic_lock, flags);
 723
 724         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 725
 726                 /* Check flogi registration completion status */
 727                 if (!hdr_status) {
 728                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 729                                       "flog reg succeeded\n");
 730                         fnic->state = FNIC_IN_FC_MODE;
 731                 } else {
 732                         FNIC_SCSI_DBG(KERN_DEBUG,
 733                                       fnic->lport->host,
 734                                       "fnic flogi reg :failed %s\n",
 735                                       fnic_fcpio_status_to_str(hdr_status));
 736                         fnic->state = FNIC_IN_ETH_MODE;
 737                         ret = -1;
 738                 }
 739         } else {
 740                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 741                               "Unexpected fnic state %s while"
 742                               " processing flogi reg completion\n",
 743                               fnic_state_to_str(fnic->state));
 744                 ret = -1;
 745         }
 746
 747         if (!ret) {
 748                 if (fnic->stop_rx_link_events) {
 749                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 750                         goto reg_cmpl_handler_end;
 751                 }
 752                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 753
 754                 fnic_flush_tx(fnic);
 755                 queue_work(fnic_event_queue, &fnic->frame_work);
 756         } else {
 757                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 758         }
 759
 760 reg_cmpl_handler_end:
 761         return ret;
 762 }
 763
 764 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 765                                         u16 request_out)
 766 {
 767         if (wq->to_clean_index <= wq->to_use_index) {
 768                 /* out of range, stale request_out index */
 769                 if (request_out < wq->to_clean_index ||
 770                     request_out >= wq->to_use_index)
 771                         return 0;
 772         } else {
 773                 /* out of range, stale request_out index */
 774                 if (request_out < wq->to_clean_index &&
 775                     request_out >= wq->to_use_index)
 776                         return 0;
 777         }
 778         /* request_out index is in range */
 779         return 1;
 780 }
 781
 782
 783 /*
 784  * Mark that ack received and store the Ack index. If there are multiple
 785  * acks received before Tx thread cleans it up, the latest value will be
 786  * used which is correct behavior. This state should be in the copy Wq
 787  * instead of in the fnic
 788  */
 789 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 790                                           unsigned int cq_index,
 791                                           struct fcpio_fw_req *desc)
 792 {
 793         struct vnic_wq_copy *wq;
 794         u16 request_out = desc->u.ack.request_out;
 795         unsigned long flags;
 796         u64 *ox_id_tag = (u64 *)(void *)desc;
 797
 798         /* mark the ack state */
 799         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 800         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 801
 802         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 803         if (is_ack_index_in_range(wq, request_out)) {
 804                 fnic->fw_ack_index[0] = request_out;
 805                 fnic->fw_ack_recd[0] = 1;
 806         } else
 807                 atomic64_inc(
 808                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 809
 810         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 811         FNIC_TRACE(fnic_fcpio_ack_handler,
 812                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 813                   ox_id_tag[4], ox_id_tag[5]);
 814 }
 815
 816 /*
 817  * fnic_fcpio_icmnd_cmpl_handler
 818  * Routine to handle icmnd completions
 819  */
 820 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 821                                          struct fcpio_fw_req *desc)
 822 {
 823         u8 type;
 824         u8 hdr_status;
 825         struct fcpio_tag tag;
 826         u32 id;
 827         u64 xfer_len = 0;
 828         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 829         struct fnic_io_req *io_req;
 830         struct scsi_cmnd *sc;
 831         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 832         unsigned long flags;
 833         spinlock_t *io_lock;
 834         u64 cmd_trace;
 835         unsigned long start_time;
 836         unsigned long io_duration_time;
 837
 838         /* Decode the cmpl description to get the io_req id */
 839         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 840         fcpio_tag_id_dec(&tag, &id);
 841         icmnd_cmpl = &desc->u.icmnd_cmpl;
 842
 843         if (id >= fnic->fnic_max_tag_id) {
 844                 shost_printk(KERN_ERR, fnic->lport->host,
 845                         "Tag out of range tag %x hdr status = %s\n",
 846                              id, fnic_fcpio_status_to_str(hdr_status));
 847                 return;
 848         }
 849
 850         sc = scsi_host_find_tag(fnic->lport->host, id);
 851         WARN_ON_ONCE(!sc);
 852         if (!sc) {
 853                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 854                 shost_printk(KERN_ERR, fnic->lport->host,
 855                           "icmnd_cmpl sc is null - "
 856                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 857                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 858                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 859                           fnic->lport->host->host_no, id,
 860                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 861                           (u64)icmnd_cmpl->_resvd0[0]),
 862                           ((u64)hdr_status << 16 |
 863                           (u64)icmnd_cmpl->scsi_status << 8 |
 864                           (u64)icmnd_cmpl->flags), desc,
 865                           (u64)icmnd_cmpl->residual, 0);
 866                 return;
 867         }
 868
 869         io_lock = fnic_io_lock_hash(fnic, sc);
 870         spin_lock_irqsave(io_lock, flags);
 871         io_req = (struct fnic_io_req *)CMD_SP(sc);
 872         WARN_ON_ONCE(!io_req);
 873         if (!io_req) {
 874                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 875                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 876                 spin_unlock_irqrestore(io_lock, flags);
 877                 shost_printk(KERN_ERR, fnic->lport->host,
 878                           "icmnd_cmpl io_req is null - "
 879                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 880                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 881                 return;
 882         }
 883         start_time = io_req->start_time;
 884
 885         /* firmware completed the io */
 886         io_req->io_completed = 1;
 887
 888         /*
 889          *  if SCSI-ML has already issued abort on this command,
 890          *  set completion of the IO. The abts path will clean it up
 891          */
 892         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 893
 894                 /*
 895                  * set the FNIC_IO_DONE so that this doesn't get
 896                  * flagged as 'out of order' if it was not aborted
 897                  */
 898                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 899                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 900                 spin_unlock_irqrestore(io_lock, flags);
 901                 if(FCPIO_ABORTED == hdr_status)
 902                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 903
 904                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 905                         "icmnd_cmpl abts pending "
 906                           "hdr status = %s tag = 0x%x sc = 0x%p "
 907                           "scsi_status = %x residual = %d\n",
 908                           fnic_fcpio_status_to_str(hdr_status),
 909                           id, sc,
 910                           icmnd_cmpl->scsi_status,
 911                           icmnd_cmpl->residual);
 912                 return;
 913         }
 914
 915         /* Mark the IO as complete */
 916         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 917
 918         icmnd_cmpl = &desc->u.icmnd_cmpl;
 919
 920         switch (hdr_status) {
 921         case FCPIO_SUCCESS:
 922                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 923                 xfer_len = scsi_bufflen(sc);
 924
 925                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER) {
 926                         xfer_len -= icmnd_cmpl->residual;
 927                         scsi_set_resid(sc, icmnd_cmpl->residual);
 928                 }
 929
 930                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 931                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 932
 933                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 934                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 935                 break;
 936
 937         case FCPIO_TIMEOUT:          /* request was timed out */
 938                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 939                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 940                 break;
 941
 942         case FCPIO_ABORTED:          /* request was aborted */
 943                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 944                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 945                 break;
 946
 947         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 948                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 949                 scsi_set_resid(sc, icmnd_cmpl->residual);
 950                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 951                 break;
 952
 953         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 954                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 955                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 956                 break;
 957
 958         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 959                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 960                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 961                 break;
 962
 963         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 964                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 965                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 966                 break;
 967
 968         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 969                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 970                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 971                 break;
 972
 973         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 974                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 975                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 976                 break;
 977
 978         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 979         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 980         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 981         default:
 982                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 983                 break;
 984         }
 985
 986         /* Break link with the SCSI command */
 987         CMD_SP(sc) = NULL;
 988         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 989
 990         spin_unlock_irqrestore(io_lock, flags);
 991
 992         if (hdr_status != FCPIO_SUCCESS) {
 993                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 994                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 995                              fnic_fcpio_status_to_str(hdr_status));
 996         }
 997
 998         fnic_release_ioreq_buf(fnic, io_req, sc);
 999
1000         mempool_free(io_req, fnic->io_req_pool);
1001
1002         cmd_trace = ((u64)hdr_status << 56) |
1003                   (u64)icmnd_cmpl->scsi_status << 48 |
1004                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
1005                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1006                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
1007
1008         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
1009                   sc->device->host->host_no, id, sc,
1010                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
1011                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1012                   jiffies_to_msecs(jiffies - start_time)),
1013                   desc, cmd_trace,
1014                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1015
1016         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1017                 fnic->lport->host_stats.fcp_input_requests++;
1018                 fnic->fcp_input_bytes += xfer_len;
1019         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1020                 fnic->lport->host_stats.fcp_output_requests++;
1021                 fnic->fcp_output_bytes += xfer_len;
1022         } else
1023                 fnic->lport->host_stats.fcp_control_requests++;
1024
1025         atomic64_dec(&fnic_stats->io_stats.active_ios);
1026         if (atomic64_read(&fnic->io_cmpl_skip))
1027                 atomic64_dec(&fnic->io_cmpl_skip);
1028         else
1029                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1030
1031
1032         io_duration_time = jiffies_to_msecs(jiffies) -
1033                                                 jiffies_to_msecs(start_time);
1034
1035         if(io_duration_time <= 10)
1036                 atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
1037         else if(io_duration_time <= 100)
1038                 atomic64_inc(&fnic_stats->io_stats.io_btw_10_to_100_msec);
1039         else if(io_duration_time <= 500)
1040                 atomic64_inc(&fnic_stats->io_stats.io_btw_100_to_500_msec);
1041         else if(io_duration_time <= 5000)
1042                 atomic64_inc(&fnic_stats->io_stats.io_btw_500_to_5000_msec);
1043         else if(io_duration_time <= 10000)
1044                 atomic64_inc(&fnic_stats->io_stats.io_btw_5000_to_10000_msec);
1045         else if(io_duration_time <= 30000)
1046                 atomic64_inc(&fnic_stats->io_stats.io_btw_10000_to_30000_msec);
1047         else {
1048                 atomic64_inc(&fnic_stats->io_stats.io_greater_than_30000_msec);
1049
1050                 if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
1051                         atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
1052         }
1053
1054         /* Call SCSI completion function to complete the IO */
1055         if (sc->scsi_done)
1056                 sc->scsi_done(sc);
1057 }
1058
1059 /* fnic_fcpio_itmf_cmpl_handler
1060  * Routine to handle itmf completions
1061  */
1062 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1063                                         struct fcpio_fw_req *desc)
1064 {
1065         u8 type;
1066         u8 hdr_status;
1067         struct fcpio_tag tag;
1068         u32 id;
1069         struct scsi_cmnd *sc;
1070         struct fnic_io_req *io_req;
1071         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1072         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1073         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1074         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1075         unsigned long flags;
1076         spinlock_t *io_lock;
1077         unsigned long start_time;
1078
1079         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1080         fcpio_tag_id_dec(&tag, &id);
1081
1082         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1083                 shost_printk(KERN_ERR, fnic->lport->host,
1084                 "Tag out of range tag %x hdr status = %s\n",
1085                 id, fnic_fcpio_status_to_str(hdr_status));
1086                 return;
1087         }
1088
1089         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1090         WARN_ON_ONCE(!sc);
1091         if (!sc) {
1092                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1093                 shost_printk(KERN_ERR, fnic->lport->host,
1094                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1095                           fnic_fcpio_status_to_str(hdr_status), id);
1096                 return;
1097         }
1098         io_lock = fnic_io_lock_hash(fnic, sc);
1099         spin_lock_irqsave(io_lock, flags);
1100         io_req = (struct fnic_io_req *)CMD_SP(sc);
1101         WARN_ON_ONCE(!io_req);
1102         if (!io_req) {
1103                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1104                 spin_unlock_irqrestore(io_lock, flags);
1105                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1106                 shost_printk(KERN_ERR, fnic->lport->host,
1107                           "itmf_cmpl io_req is null - "
1108                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1109                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1110                 return;
1111         }
1112         start_time = io_req->start_time;
1113
1114         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1115                 /* Abort and terminate completion of device reset req */
1116                 /* REVISIT : Add asserts about various flags */
1117                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1118                               "dev reset abts cmpl recd. id %x status %s\n",
1119                               id, fnic_fcpio_status_to_str(hdr_status));
1120                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1121                 CMD_ABTS_STATUS(sc) = hdr_status;
1122                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1123                 if (io_req->abts_done)
1124                         complete(io_req->abts_done);
1125                 spin_unlock_irqrestore(io_lock, flags);
1126         } else if (id & FNIC_TAG_ABORT) {
1127                 /* Completion of abort cmd */
1128                 switch (hdr_status) {
1129                 case FCPIO_SUCCESS:
1130                         break;
1131                 case FCPIO_TIMEOUT:
1132                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1133                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1134                         else
1135                                 atomic64_inc(
1136                                         &term_stats->terminate_fw_timeouts);
1137                         break;
1138                 case FCPIO_ITMF_REJECTED:
1139                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1140                                 "abort reject recd. id %d\n",
1141                                 (int)(id & FNIC_TAG_MASK));
1142                         break;
1143                 case FCPIO_IO_NOT_FOUND:
1144                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1145                                 atomic64_inc(&abts_stats->abort_io_not_found);
1146                         else
1147                                 atomic64_inc(
1148                                         &term_stats->terminate_io_not_found);
1149                         break;
1150                 default:
1151                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1152                                 atomic64_inc(&abts_stats->abort_failures);
1153                         else
1154                                 atomic64_inc(
1155                                         &term_stats->terminate_failures);
1156                         break;
1157                 }
1158                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1159                         /* This is a late completion. Ignore it */
1160                         spin_unlock_irqrestore(io_lock, flags);
1161                         return;
1162                 }
1163
1164                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1165                 CMD_ABTS_STATUS(sc) = hdr_status;
1166
1167                 /* If the status is IO not found consider it as success */
1168                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1169                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1170
1171                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1172                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1173
1174                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1175                               "abts cmpl recd. id %d status %s\n",
1176                               (int)(id & FNIC_TAG_MASK),
1177                               fnic_fcpio_status_to_str(hdr_status));
1178
1179                 /*
1180                  * If scsi_eh thread is blocked waiting for abts to complete,
1181                  * signal completion to it. IO will be cleaned in the thread
1182                  * else clean it in this context
1183                  */
1184                 if (io_req->abts_done) {
1185                         complete(io_req->abts_done);
1186                         spin_unlock_irqrestore(io_lock, flags);
1187                 } else {
1188                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1189                                       "abts cmpl, completing IO\n");
1190                         CMD_SP(sc) = NULL;
1191                         sc->result = (DID_ERROR << 16);
1192
1193                         spin_unlock_irqrestore(io_lock, flags);
1194
1195                         fnic_release_ioreq_buf(fnic, io_req, sc);
1196                         mempool_free(io_req, fnic->io_req_pool);
1197                         if (sc->scsi_done) {
1198                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1199                                         sc->device->host->host_no, id,
1200                                         sc,
1201                                         jiffies_to_msecs(jiffies - start_time),
1202                                         desc,
1203                                         (((u64)hdr_status << 40) |
1204                                         (u64)sc->cmnd[0] << 32 |
1205                                         (u64)sc->cmnd[2] << 24 |
1206                                         (u64)sc->cmnd[3] << 16 |
1207                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1208                                         (((u64)CMD_FLAGS(sc) << 32) |
1209                                         CMD_STATE(sc)));
1210                                 sc->scsi_done(sc);
1211                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1212                                 if (atomic64_read(&fnic->io_cmpl_skip))
1213                                         atomic64_dec(&fnic->io_cmpl_skip);
1214                                 else
1215                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1216                         }
1217                 }
1218
1219         } else if (id & FNIC_TAG_DEV_RST) {
1220                 /* Completion of device reset */
1221                 CMD_LR_STATUS(sc) = hdr_status;
1222                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1223                         spin_unlock_irqrestore(io_lock, flags);
1224                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1225                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1226                                   sc->device->host->host_no, id, sc,
1227                                   jiffies_to_msecs(jiffies - start_time),
1228                                   desc, 0,
1229                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1230                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1231                                 "Terminate pending "
1232                                 "dev reset cmpl recd. id %d status %s\n",
1233                                 (int)(id & FNIC_TAG_MASK),
1234                                 fnic_fcpio_status_to_str(hdr_status));
1235                         return;
1236                 }
1237                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1238                         /* Need to wait for terminate completion */
1239                         spin_unlock_irqrestore(io_lock, flags);
1240                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1241                                   sc->device->host->host_no, id, sc,
1242                                   jiffies_to_msecs(jiffies - start_time),
1243                                   desc, 0,
1244                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1245                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1246                                 "dev reset cmpl recd after time out. "
1247                                 "id %d status %s\n",
1248                                 (int)(id & FNIC_TAG_MASK),
1249                                 fnic_fcpio_status_to_str(hdr_status));
1250                         return;
1251                 }
1252                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1253                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1254                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1255                               "dev reset cmpl recd. id %d status %s\n",
1256                               (int)(id & FNIC_TAG_MASK),
1257                               fnic_fcpio_status_to_str(hdr_status));
1258                 if (io_req->dr_done)
1259                         complete(io_req->dr_done);
1260                 spin_unlock_irqrestore(io_lock, flags);
1261
1262         } else {
1263                 shost_printk(KERN_ERR, fnic->lport->host,
1264                              "Unexpected itmf io state %s tag %x\n",
1265                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1266                 spin_unlock_irqrestore(io_lock, flags);
1267         }
1268
1269 }
1270
1271 /*
1272  * fnic_fcpio_cmpl_handler
1273  * Routine to service the cq for wq_copy
1274  */
1275 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1276                                    unsigned int cq_index,
1277                                    struct fcpio_fw_req *desc)
1278 {
1279         struct fnic *fnic = vnic_dev_priv(vdev);
1280
1281         switch (desc->hdr.type) {
1282         case FCPIO_ICMND_CMPL: /* fw completed a command */
1283         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1284         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1285         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1286         case FCPIO_RESET_CMPL: /* fw completed reset */
1287                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1288                 break;
1289         default:
1290                 break;
1291         }
1292
1293         switch (desc->hdr.type) {
1294         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1295                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1296                 break;
1297
1298         case FCPIO_ICMND_CMPL: /* fw completed a command */
1299                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1300                 break;
1301
1302         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1303                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1304                 break;
1305
1306         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1307         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1308                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1309                 break;
1310
1311         case FCPIO_RESET_CMPL: /* fw completed reset */
1312                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1313                 break;
1314
1315         default:
1316                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1317                               "firmware completion type %d\n",
1318                               desc->hdr.type);
1319                 break;
1320         }
1321
1322         return 0;
1323 }
1324
1325 /*
1326  * fnic_wq_copy_cmpl_handler
1327  * Routine to process wq copy
1328  */
1329 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1330 {
1331         unsigned int wq_work_done = 0;
1332         unsigned int i, cq_index;
1333         unsigned int cur_work_done;
1334         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1335         u64 start_jiffies = 0;
1336         u64 end_jiffies = 0;
1337         u64 delta_jiffies = 0;
1338         u64 delta_ms = 0;
1339
1340         for (i = 0; i < fnic->wq_copy_count; i++) {
1341                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1342
1343                 start_jiffies = jiffies;
1344                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1345                                                      fnic_fcpio_cmpl_handler,
1346                                                      copy_work_to_do);
1347                 end_jiffies = jiffies;
1348
1349                 wq_work_done += cur_work_done;
1350                 delta_jiffies = end_jiffies - start_jiffies;
1351                 if (delta_jiffies >
1352                         (u64) atomic64_read(&misc_stats->max_isr_jiffies)) {
1353                         atomic64_set(&misc_stats->max_isr_jiffies,
1354                                         delta_jiffies);
1355                         delta_ms = jiffies_to_msecs(delta_jiffies);
1356                         atomic64_set(&misc_stats->max_isr_time_ms, delta_ms);
1357                         atomic64_set(&misc_stats->corr_work_done,
1358                                         cur_work_done);
1359                 }
1360         }
1361         return wq_work_done;
1362 }
1363
1364 static bool fnic_cleanup_io_iter(struct scsi_cmnd *sc, void *data,
1365                                  bool reserved)
1366 {
1367         struct fnic *fnic = data;
1368         struct fnic_io_req *io_req;
1369         unsigned long flags = 0;
1370         spinlock_t *io_lock;
1371         unsigned long start_time = 0;
1372         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1373
1374         io_lock = fnic_io_lock_tag(fnic, sc->request->tag);
1375         spin_lock_irqsave(io_lock, flags);
1376
1377         io_req = (struct fnic_io_req *)CMD_SP(sc);
1378         if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1379             !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1380                 /*
1381                  * We will be here only when FW completes reset
1382                  * without sending completions for outstanding ios.
1383                  */
1384                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1385                 if (io_req && io_req->dr_done)
1386                         complete(io_req->dr_done);
1387                 else if (io_req && io_req->abts_done)
1388                         complete(io_req->abts_done);
1389                 spin_unlock_irqrestore(io_lock, flags);
1390                 return true;
1391         } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1392                 spin_unlock_irqrestore(io_lock, flags);
1393                 return true;
1394         }
1395         if (!io_req) {
1396                 spin_unlock_irqrestore(io_lock, flags);
1397                 goto cleanup_scsi_cmd;
1398         }
1399
1400         CMD_SP(sc) = NULL;
1401
1402         spin_unlock_irqrestore(io_lock, flags);
1403
1404         /*
1405          * If there is a scsi_cmnd associated with this io_req, then
1406          * free the corresponding state
1407          */
1408         start_time = io_req->start_time;
1409         fnic_release_ioreq_buf(fnic, io_req, sc);
1410         mempool_free(io_req, fnic->io_req_pool);
1411
1412 cleanup_scsi_cmd:
1413         sc->result = DID_TRANSPORT_DISRUPTED << 16;
1414         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1415                       "fnic_cleanup_io: tag:0x%x : sc:0x%p duration = %lu DID_TRANSPORT_DISRUPTED\n",
1416                       sc->request->tag, sc, (jiffies - start_time));
1417
1418         if (atomic64_read(&fnic->io_cmpl_skip))
1419                 atomic64_dec(&fnic->io_cmpl_skip);
1420         else
1421                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1422
1423         /* Complete the command to SCSI */
1424         if (sc->scsi_done) {
1425                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED))
1426                         shost_printk(KERN_ERR, fnic->lport->host,
1427                                      "Calling done for IO not issued to fw: tag:0x%x sc:0x%p\n",
1428                                      sc->request->tag, sc);
1429
1430                 FNIC_TRACE(fnic_cleanup_io,
1431                            sc->device->host->host_no, sc->request->tag, sc,
1432                            jiffies_to_msecs(jiffies - start_time),
1433                            0, ((u64)sc->cmnd[0] << 32 |
1434                                (u64)sc->cmnd[2] << 24 |
1435                                (u64)sc->cmnd[3] << 16 |
1436                                (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1437                            (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1438
1439                 sc->scsi_done(sc);
1440         }
1441         return true;
1442 }
1443
1444 static void fnic_cleanup_io(struct fnic *fnic)
1445 {
1446         scsi_host_busy_iter(fnic->lport->host,
1447                             fnic_cleanup_io_iter, fnic);
1448 }
1449
1450 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1451                                   struct fcpio_host_req *desc)
1452 {
1453         u32 id;
1454         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1455         struct fnic_io_req *io_req;
1456         struct scsi_cmnd *sc;
1457         unsigned long flags;
1458         spinlock_t *io_lock;
1459         unsigned long start_time = 0;
1460
1461         /* get the tag reference */
1462         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1463         id &= FNIC_TAG_MASK;
1464
1465         if (id >= fnic->fnic_max_tag_id)
1466                 return;
1467
1468         sc = scsi_host_find_tag(fnic->lport->host, id);
1469         if (!sc)
1470                 return;
1471
1472         io_lock = fnic_io_lock_hash(fnic, sc);
1473         spin_lock_irqsave(io_lock, flags);
1474
1475         /* Get the IO context which this desc refers to */
1476         io_req = (struct fnic_io_req *)CMD_SP(sc);
1477
1478         /* fnic interrupts are turned off by now */
1479
1480         if (!io_req) {
1481                 spin_unlock_irqrestore(io_lock, flags);
1482                 goto wq_copy_cleanup_scsi_cmd;
1483         }
1484
1485         CMD_SP(sc) = NULL;
1486
1487         spin_unlock_irqrestore(io_lock, flags);
1488
1489         start_time = io_req->start_time;
1490         fnic_release_ioreq_buf(fnic, io_req, sc);
1491         mempool_free(io_req, fnic->io_req_pool);
1492
1493 wq_copy_cleanup_scsi_cmd:
1494         sc->result = DID_NO_CONNECT << 16;
1495         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1496                       " DID_NO_CONNECT\n");
1497
1498         if (sc->scsi_done) {
1499                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1500                           sc->device->host->host_no, id, sc,
1501                           jiffies_to_msecs(jiffies - start_time),
1502                           0, ((u64)sc->cmnd[0] << 32 |
1503                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1504                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1505                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1506
1507                 sc->scsi_done(sc);
1508         }
1509 }
1510
1511 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1512                                           u32 task_req, u8 *fc_lun,
1513                                           struct fnic_io_req *io_req)
1514 {
1515         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1516         struct Scsi_Host *host = fnic->lport->host;
1517         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1518         unsigned long flags;
1519
1520         spin_lock_irqsave(host->host_lock, flags);
1521         if (unlikely(fnic_chk_state_flags_locked(fnic,
1522                                                 FNIC_FLAGS_IO_BLOCKED))) {
1523                 spin_unlock_irqrestore(host->host_lock, flags);
1524                 return 1;
1525         } else
1526                 atomic_inc(&fnic->in_flight);
1527         spin_unlock_irqrestore(host->host_lock, flags);
1528
1529         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1530
1531         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1532                 free_wq_copy_descs(fnic, wq);
1533
1534         if (!vnic_wq_copy_desc_avail(wq)) {
1535                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1536                 atomic_dec(&fnic->in_flight);
1537                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1538                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1539                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1540                 return 1;
1541         }
1542         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1543                                      0, task_req, tag, fc_lun, io_req->port_id,
1544                                      fnic->config.ra_tov, fnic->config.ed_tov);
1545
1546         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1547         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1548                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1549                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1550                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1551
1552         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1553         atomic_dec(&fnic->in_flight);
1554
1555         return 0;
1556 }
1557
1558 struct fnic_rport_abort_io_iter_data {
1559         struct fnic *fnic;
1560         u32 port_id;
1561         int term_cnt;
1562 };
1563
1564 static bool fnic_rport_abort_io_iter(struct scsi_cmnd *sc, void *data,
1565                                      bool reserved)
1566 {
1567         struct fnic_rport_abort_io_iter_data *iter_data = data;
1568         struct fnic *fnic = iter_data->fnic;
1569         int abt_tag = sc->request->tag;
1570         struct fnic_io_req *io_req;
1571         spinlock_t *io_lock;
1572         unsigned long flags;
1573         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1574         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1575         struct scsi_lun fc_lun;
1576         enum fnic_ioreq_state old_ioreq_state;
1577
1578         io_lock = fnic_io_lock_tag(fnic, abt_tag);
1579         spin_lock_irqsave(io_lock, flags);
1580
1581         io_req = (struct fnic_io_req *)CMD_SP(sc);
1582
1583         if (!io_req || io_req->port_id != iter_data->port_id) {
1584                 spin_unlock_irqrestore(io_lock, flags);
1585                 return true;
1586         }
1587
1588         if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1589             (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1590                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1591                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1592                         sc);
1593                 spin_unlock_irqrestore(io_lock, flags);
1594                 return true;
1595         }
1596
1597         /*
1598          * Found IO that is still pending with firmware and
1599          * belongs to rport that went away
1600          */
1601         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1602                 spin_unlock_irqrestore(io_lock, flags);
1603                 return true;
1604         }
1605         if (io_req->abts_done) {
1606                 shost_printk(KERN_ERR, fnic->lport->host,
1607                         "fnic_rport_exch_reset: io_req->abts_done is set "
1608                         "state is %s\n",
1609                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1610         }
1611
1612         if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1613                 shost_printk(KERN_ERR, fnic->lport->host,
1614                              "rport_exch_reset "
1615                              "IO not yet issued %p tag 0x%x flags "
1616                              "%x state %d\n",
1617                              sc, abt_tag, CMD_FLAGS(sc), CMD_STATE(sc));
1618         }
1619         old_ioreq_state = CMD_STATE(sc);
1620         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1621         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1622         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1623                 atomic64_inc(&reset_stats->device_reset_terminates);
1624                 abt_tag |= FNIC_TAG_DEV_RST;
1625         }
1626         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1627                       "fnic_rport_exch_reset dev rst sc 0x%p\n", sc);
1628         BUG_ON(io_req->abts_done);
1629
1630         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1631                       "fnic_rport_reset_exch: Issuing abts\n");
1632
1633         spin_unlock_irqrestore(io_lock, flags);
1634
1635         /* Now queue the abort command to firmware */
1636         int_to_scsilun(sc->device->lun, &fc_lun);
1637
1638         if (fnic_queue_abort_io_req(fnic, abt_tag,
1639                                     FCPIO_ITMF_ABT_TASK_TERM,
1640                                     fc_lun.scsi_lun, io_req)) {
1641                 /*
1642                  * Revert the cmd state back to old state, if
1643                  * it hasn't changed in between. This cmd will get
1644                  * aborted later by scsi_eh, or cleaned up during
1645                  * lun reset
1646                  */
1647                 spin_lock_irqsave(io_lock, flags);
1648                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1649                         CMD_STATE(sc) = old_ioreq_state;
1650                 spin_unlock_irqrestore(io_lock, flags);
1651         } else {
1652                 spin_lock_irqsave(io_lock, flags);
1653                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1654                         CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1655                 else
1656                         CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1657                 spin_unlock_irqrestore(io_lock, flags);
1658                 atomic64_inc(&term_stats->terminates);
1659                 iter_data->term_cnt++;
1660         }
1661         return true;
1662 }
1663
1664 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1665 {
1666         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1667         struct fnic_rport_abort_io_iter_data iter_data = {
1668                 .fnic = fnic,
1669                 .port_id = port_id,
1670                 .term_cnt = 0,
1671         };
1672
1673         FNIC_SCSI_DBG(KERN_DEBUG,
1674                       fnic->lport->host,
1675                       "fnic_rport_exch_reset called portid 0x%06x\n",
1676                       port_id);
1677
1678         if (fnic->in_remove)
1679                 return;
1680
1681         scsi_host_busy_iter(fnic->lport->host, fnic_rport_abort_io_iter,
1682                             &iter_data);
1683         if (iter_data.term_cnt > atomic64_read(&term_stats->max_terminates))
1684                 atomic64_set(&term_stats->max_terminates, iter_data.term_cnt);
1685
1686 }
1687
1688 void fnic_terminate_rport_io(struct fc_rport *rport)
1689 {
1690         struct fc_rport_libfc_priv *rdata;
1691         struct fc_lport *lport;
1692         struct fnic *fnic;
1693
1694         if (!rport) {
1695                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1696                 return;
1697         }
1698         rdata = rport->dd_data;
1699
1700         if (!rdata) {
1701                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1702                 return;
1703         }
1704         lport = rdata->local_port;
1705
1706         if (!lport) {
1707                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1708                 return;
1709         }
1710         fnic = lport_priv(lport);
1711         FNIC_SCSI_DBG(KERN_DEBUG,
1712                       fnic->lport->host, "fnic_terminate_rport_io called"
1713                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1714                       rport->port_name, rport->node_name, rport,
1715                       rport->port_id);
1716
1717         if (fnic->in_remove)
1718                 return;
1719
1720         fnic_rport_exch_reset(fnic, rport->port_id);
1721 }
1722
1723 /*
1724  * This function is exported to SCSI for sending abort cmnds.
1725  * A SCSI IO is represented by a io_req in the driver.
1726  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1727  */
1728 int fnic_abort_cmd(struct scsi_cmnd *sc)
1729 {
1730         struct fc_lport *lp;
1731         struct fnic *fnic;
1732         struct fnic_io_req *io_req = NULL;
1733         struct fc_rport *rport;
1734         spinlock_t *io_lock;
1735         unsigned long flags;
1736         unsigned long start_time = 0;
1737         int ret = SUCCESS;
1738         u32 task_req = 0;
1739         struct scsi_lun fc_lun;
1740         struct fnic_stats *fnic_stats;
1741         struct abort_stats *abts_stats;
1742         struct terminate_stats *term_stats;
1743         enum fnic_ioreq_state old_ioreq_state;
1744         int tag;
1745         unsigned long abt_issued_time;
1746         DECLARE_COMPLETION_ONSTACK(tm_done);
1747
1748         /* Wait for rport to unblock */
1749         fc_block_scsi_eh(sc);
1750
1751         /* Get local-port, check ready and link up */
1752         lp = shost_priv(sc->device->host);
1753
1754         fnic = lport_priv(lp);
1755         fnic_stats = &fnic->fnic_stats;
1756         abts_stats = &fnic->fnic_stats.abts_stats;
1757         term_stats = &fnic->fnic_stats.term_stats;
1758
1759         rport = starget_to_rport(scsi_target(sc->device));
1760         tag = sc->request->tag;
1761         FNIC_SCSI_DBG(KERN_DEBUG,
1762                 fnic->lport->host,
1763                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1764                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1765
1766         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1767
1768         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1769                 ret = FAILED;
1770                 goto fnic_abort_cmd_end;
1771         }
1772
1773         /*
1774          * Avoid a race between SCSI issuing the abort and the device
1775          * completing the command.
1776          *
1777          * If the command is already completed by the fw cmpl code,
1778          * we just return SUCCESS from here. This means that the abort
1779          * succeeded. In the SCSI ML, since the timeout for command has
1780          * happened, the completion wont actually complete the command
1781          * and it will be considered as an aborted command
1782          *
1783          * The CMD_SP will not be cleared except while holding io_req_lock.
1784          */
1785         io_lock = fnic_io_lock_hash(fnic, sc);
1786         spin_lock_irqsave(io_lock, flags);
1787         io_req = (struct fnic_io_req *)CMD_SP(sc);
1788         if (!io_req) {
1789                 spin_unlock_irqrestore(io_lock, flags);
1790                 goto fnic_abort_cmd_end;
1791         }
1792
1793         io_req->abts_done = &tm_done;
1794
1795         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1796                 spin_unlock_irqrestore(io_lock, flags);
1797                 goto wait_pending;
1798         }
1799
1800         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1801         if (abt_issued_time <= 6000)
1802                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1803         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1804                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1805         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1806                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1807         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1808                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1809         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1810                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1811         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1812                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1813         else
1814                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1815
1816         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1817                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1818         /*
1819          * Command is still pending, need to abort it
1820          * If the firmware completes the command after this point,
1821          * the completion wont be done till mid-layer, since abort
1822          * has already started.
1823          */
1824         old_ioreq_state = CMD_STATE(sc);
1825         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1826         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1827
1828         spin_unlock_irqrestore(io_lock, flags);
1829
1830         /*
1831          * Check readiness of the remote port. If the path to remote
1832          * port is up, then send abts to the remote port to terminate
1833          * the IO. Else, just locally terminate the IO in the firmware
1834          */
1835         if (fc_remote_port_chkready(rport) == 0)
1836                 task_req = FCPIO_ITMF_ABT_TASK;
1837         else {
1838                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1839                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1840         }
1841
1842         /* Now queue the abort command to firmware */
1843         int_to_scsilun(sc->device->lun, &fc_lun);
1844
1845         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1846                                     fc_lun.scsi_lun, io_req)) {
1847                 spin_lock_irqsave(io_lock, flags);
1848                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1849                         CMD_STATE(sc) = old_ioreq_state;
1850                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1851                 if (io_req)
1852                         io_req->abts_done = NULL;
1853                 spin_unlock_irqrestore(io_lock, flags);
1854                 ret = FAILED;
1855                 goto fnic_abort_cmd_end;
1856         }
1857         if (task_req == FCPIO_ITMF_ABT_TASK) {
1858                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1859                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1860         } else {
1861                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1862                 atomic64_inc(&fnic_stats->term_stats.terminates);
1863         }
1864
1865         /*
1866          * We queued an abort IO, wait for its completion.
1867          * Once the firmware completes the abort command, it will
1868          * wake up this thread.
1869          */
1870  wait_pending:
1871         wait_for_completion_timeout(&tm_done,
1872                                     msecs_to_jiffies
1873                                     (2 * fnic->config.ra_tov +
1874                                      fnic->config.ed_tov));
1875
1876         /* Check the abort status */
1877         spin_lock_irqsave(io_lock, flags);
1878
1879         io_req = (struct fnic_io_req *)CMD_SP(sc);
1880         if (!io_req) {
1881                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1882                 spin_unlock_irqrestore(io_lock, flags);
1883                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1884                 ret = FAILED;
1885                 goto fnic_abort_cmd_end;
1886         }
1887         io_req->abts_done = NULL;
1888
1889         /* fw did not complete abort, timed out */
1890         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1891                 spin_unlock_irqrestore(io_lock, flags);
1892                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1893                         atomic64_inc(&abts_stats->abort_drv_timeouts);
1894                 } else {
1895                         atomic64_inc(&term_stats->terminate_drv_timeouts);
1896                 }
1897                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
1898                 ret = FAILED;
1899                 goto fnic_abort_cmd_end;
1900         }
1901
1902         /* IO out of order */
1903
1904         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
1905                 spin_unlock_irqrestore(io_lock, flags);
1906                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1907                         "Issuing Host reset due to out of order IO\n");
1908
1909                 ret = FAILED;
1910                 goto fnic_abort_cmd_end;
1911         }
1912
1913         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1914
1915         start_time = io_req->start_time;
1916         /*
1917          * firmware completed the abort, check the status,
1918          * free the io_req if successful. If abort fails,
1919          * Device reset will clean the I/O.
1920          */
1921         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
1922                 CMD_SP(sc) = NULL;
1923         else {
1924                 ret = FAILED;
1925                 spin_unlock_irqrestore(io_lock, flags);
1926                 goto fnic_abort_cmd_end;
1927         }
1928
1929         spin_unlock_irqrestore(io_lock, flags);
1930
1931         fnic_release_ioreq_buf(fnic, io_req, sc);
1932         mempool_free(io_req, fnic->io_req_pool);
1933
1934         if (sc->scsi_done) {
1935         /* Call SCSI completion function to complete the IO */
1936                 sc->result = (DID_ABORT << 16);
1937                 sc->scsi_done(sc);
1938                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1939                 if (atomic64_read(&fnic->io_cmpl_skip))
1940                         atomic64_dec(&fnic->io_cmpl_skip);
1941                 else
1942                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1943         }
1944
1945 fnic_abort_cmd_end:
1946         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
1947                   sc->request->tag, sc,
1948                   jiffies_to_msecs(jiffies - start_time),
1949                   0, ((u64)sc->cmnd[0] << 32 |
1950                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1951                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1952                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1953
1954         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1955                       "Returning from abort cmd type %x %s\n", task_req,
1956                       (ret == SUCCESS) ?
1957                       "SUCCESS" : "FAILED");
1958         return ret;
1959 }
1960
1961 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
1962                                        struct scsi_cmnd *sc,
1963                                        struct fnic_io_req *io_req)
1964 {
1965         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1966         struct Scsi_Host *host = fnic->lport->host;
1967         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1968         struct scsi_lun fc_lun;
1969         int ret = 0;
1970         unsigned long intr_flags;
1971
1972         spin_lock_irqsave(host->host_lock, intr_flags);
1973         if (unlikely(fnic_chk_state_flags_locked(fnic,
1974                                                 FNIC_FLAGS_IO_BLOCKED))) {
1975                 spin_unlock_irqrestore(host->host_lock, intr_flags);
1976                 return FAILED;
1977         } else
1978                 atomic_inc(&fnic->in_flight);
1979         spin_unlock_irqrestore(host->host_lock, intr_flags);
1980
1981         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
1982
1983         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1984                 free_wq_copy_descs(fnic, wq);
1985
1986         if (!vnic_wq_copy_desc_avail(wq)) {
1987                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1988                           "queue_dr_io_req failure - no descriptors\n");
1989                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
1990                 ret = -EAGAIN;
1991                 goto lr_io_req_end;
1992         }
1993
1994         /* fill in the lun info */
1995         int_to_scsilun(sc->device->lun, &fc_lun);
1996
1997         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
1998                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
1999                                      fc_lun.scsi_lun, io_req->port_id,
2000                                      fnic->config.ra_tov, fnic->config.ed_tov);
2001
2002         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2003         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2004                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2005                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2006                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2007
2008 lr_io_req_end:
2009         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2010         atomic_dec(&fnic->in_flight);
2011
2012         return ret;
2013 }
2014
2015 struct fnic_pending_aborts_iter_data {
2016         struct fnic *fnic;
2017         struct scsi_cmnd *lr_sc;
2018         struct scsi_device *lun_dev;
2019         int ret;
2020 };
2021
2022 static bool fnic_pending_aborts_iter(struct scsi_cmnd *sc,
2023                                      void *data, bool reserved)
2024 {
2025         struct fnic_pending_aborts_iter_data *iter_data = data;
2026         struct fnic *fnic = iter_data->fnic;
2027         struct scsi_device *lun_dev = iter_data->lun_dev;
2028         int abt_tag = sc->request->tag;
2029         struct fnic_io_req *io_req;
2030         spinlock_t *io_lock;
2031         unsigned long flags;
2032         struct scsi_lun fc_lun;
2033         DECLARE_COMPLETION_ONSTACK(tm_done);
2034         enum fnic_ioreq_state old_ioreq_state;
2035
2036         if (sc == iter_data->lr_sc || sc->device != lun_dev)
2037                 return true;
2038         if (reserved)
2039                 return true;
2040
2041         io_lock = fnic_io_lock_tag(fnic, abt_tag);
2042         spin_lock_irqsave(io_lock, flags);
2043         io_req = (struct fnic_io_req *)CMD_SP(sc);
2044         if (!io_req) {
2045                 spin_unlock_irqrestore(io_lock, flags);
2046                 return true;
2047         }
2048
2049         /*
2050          * Found IO that is still pending with firmware and
2051          * belongs to the LUN that we are resetting
2052          */
2053         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2054                       "Found IO in %s on lun\n",
2055                       fnic_ioreq_state_to_str(CMD_STATE(sc)));
2056
2057         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2058                 spin_unlock_irqrestore(io_lock, flags);
2059                 return true;
2060         }
2061         if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2062             (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2063                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2064                               "%s dev rst not pending sc 0x%p\n", __func__,
2065                               sc);
2066                 spin_unlock_irqrestore(io_lock, flags);
2067                 return true;
2068         }
2069
2070         if (io_req->abts_done)
2071                 shost_printk(KERN_ERR, fnic->lport->host,
2072                              "%s: io_req->abts_done is set state is %s\n",
2073                              __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2074         old_ioreq_state = CMD_STATE(sc);
2075         /*
2076          * Any pending IO issued prior to reset is expected to be
2077          * in abts pending state, if not we need to set
2078          * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2079          * When IO is completed, the IO will be handed over and
2080          * handled in this function.
2081          */
2082         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2083
2084         BUG_ON(io_req->abts_done);
2085
2086         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2087                 abt_tag |= FNIC_TAG_DEV_RST;
2088                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2089                               "%s: dev rst sc 0x%p\n", __func__, sc);
2090         }
2091
2092         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2093         io_req->abts_done = &tm_done;
2094         spin_unlock_irqrestore(io_lock, flags);
2095
2096         /* Now queue the abort command to firmware */
2097         int_to_scsilun(sc->device->lun, &fc_lun);
2098
2099         if (fnic_queue_abort_io_req(fnic, abt_tag,
2100                                     FCPIO_ITMF_ABT_TASK_TERM,
2101                                     fc_lun.scsi_lun, io_req)) {
2102                 spin_lock_irqsave(io_lock, flags);
2103                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2104                 if (io_req)
2105                         io_req->abts_done = NULL;
2106                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2107                         CMD_STATE(sc) = old_ioreq_state;
2108                 spin_unlock_irqrestore(io_lock, flags);
2109                 iter_data->ret = FAILED;
2110                 return false;
2111         } else {
2112                 spin_lock_irqsave(io_lock, flags);
2113                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2114                         CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2115                 spin_unlock_irqrestore(io_lock, flags);
2116         }
2117         CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2118
2119         wait_for_completion_timeout(&tm_done, msecs_to_jiffies
2120                                     (fnic->config.ed_tov));
2121
2122         /* Recheck cmd state to check if it is now aborted */
2123         spin_lock_irqsave(io_lock, flags);
2124         io_req = (struct fnic_io_req *)CMD_SP(sc);
2125         if (!io_req) {
2126                 spin_unlock_irqrestore(io_lock, flags);
2127                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2128                 return true;
2129         }
2130
2131         io_req->abts_done = NULL;
2132
2133         /* if abort is still pending with fw, fail */
2134         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2135                 spin_unlock_irqrestore(io_lock, flags);
2136                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2137                 iter_data->ret = FAILED;
2138                 return false;
2139         }
2140         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2141
2142         /* original sc used for lr is handled by dev reset code */
2143         if (sc != iter_data->lr_sc)
2144                 CMD_SP(sc) = NULL;
2145         spin_unlock_irqrestore(io_lock, flags);
2146
2147         /* original sc used for lr is handled by dev reset code */
2148         if (sc != iter_data->lr_sc) {
2149                 fnic_release_ioreq_buf(fnic, io_req, sc);
2150                 mempool_free(io_req, fnic->io_req_pool);
2151         }
2152
2153         /*
2154          * Any IO is returned during reset, it needs to call scsi_done
2155          * to return the scsi_cmnd to upper layer.
2156          */
2157         if (sc->scsi_done) {
2158                 /* Set result to let upper SCSI layer retry */
2159                 sc->result = DID_RESET << 16;
2160                 sc->scsi_done(sc);
2161         }
2162         return true;
2163 }
2164
2165 /*
2166  * Clean up any pending aborts on the lun
2167  * For each outstanding IO on this lun, whose abort is not completed by fw,
2168  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2169  * successfully aborted, 1 otherwise
2170  */
2171 static int fnic_clean_pending_aborts(struct fnic *fnic,
2172                                      struct scsi_cmnd *lr_sc,
2173                                      bool new_sc)
2174
2175 {
2176         int ret = SUCCESS;
2177         struct fnic_pending_aborts_iter_data iter_data = {
2178                 .fnic = fnic,
2179                 .lun_dev = lr_sc->device,
2180                 .ret = SUCCESS,
2181         };
2182
2183         if (new_sc)
2184                 iter_data.lr_sc = lr_sc;
2185
2186         scsi_host_busy_iter(fnic->lport->host,
2187                             fnic_pending_aborts_iter, &iter_data);
2188         if (iter_data.ret == FAILED) {
2189                 ret = iter_data.ret;
2190                 goto clean_pending_aborts_end;
2191         }
2192         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2193
2194         /* walk again to check, if IOs are still pending in fw */
2195         if (fnic_is_abts_pending(fnic, lr_sc))
2196                 ret = FAILED;
2197
2198 clean_pending_aborts_end:
2199         return ret;
2200 }
2201
2202 /*
2203  * fnic_scsi_host_start_tag
2204  * Allocates tagid from host's tag list
2205  **/
2206 static inline int
2207 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2208 {
2209         struct request_queue *q = sc->request->q;
2210         struct request *dummy;
2211
2212         dummy = blk_mq_alloc_request(q, REQ_OP_WRITE, BLK_MQ_REQ_NOWAIT);
2213         if (IS_ERR(dummy))
2214                 return SCSI_NO_TAG;
2215
2216         sc->tag = sc->request->tag = dummy->tag;
2217         sc->host_scribble = (unsigned char *)dummy;
2218
2219         return dummy->tag;
2220 }
2221
2222 /*
2223  * fnic_scsi_host_end_tag
2224  * frees tag allocated by fnic_scsi_host_start_tag.
2225  **/
2226 static inline void
2227 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2228 {
2229         struct request *dummy = (struct request *)sc->host_scribble;
2230
2231         blk_mq_free_request(dummy);
2232 }
2233
2234 /*
2235  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2236  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2237  * on the LUN.
2238  */
2239 int fnic_device_reset(struct scsi_cmnd *sc)
2240 {
2241         struct fc_lport *lp;
2242         struct fnic *fnic;
2243         struct fnic_io_req *io_req = NULL;
2244         struct fc_rport *rport;
2245         int status;
2246         int ret = FAILED;
2247         spinlock_t *io_lock;
2248         unsigned long flags;
2249         unsigned long start_time = 0;
2250         struct scsi_lun fc_lun;
2251         struct fnic_stats *fnic_stats;
2252         struct reset_stats *reset_stats;
2253         int tag = 0;
2254         DECLARE_COMPLETION_ONSTACK(tm_done);
2255         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2256         bool new_sc = 0;
2257
2258         /* Wait for rport to unblock */
2259         fc_block_scsi_eh(sc);
2260
2261         /* Get local-port, check ready and link up */
2262         lp = shost_priv(sc->device->host);
2263
2264         fnic = lport_priv(lp);
2265         fnic_stats = &fnic->fnic_stats;
2266         reset_stats = &fnic->fnic_stats.reset_stats;
2267
2268         atomic64_inc(&reset_stats->device_resets);
2269
2270         rport = starget_to_rport(scsi_target(sc->device));
2271         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2272                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2273                       rport->port_id, sc->device->lun, sc);
2274
2275         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2276                 goto fnic_device_reset_end;
2277
2278         /* Check if remote port up */
2279         if (fc_remote_port_chkready(rport)) {
2280                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2281                 goto fnic_device_reset_end;
2282         }
2283
2284         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2285         /* Allocate tag if not present */
2286
2287         tag = sc->request->tag;
2288         if (unlikely(tag < 0)) {
2289                 /*
2290                  * Really should fix the midlayer to pass in a proper
2291                  * request for ioctls...
2292                  */
2293                 tag = fnic_scsi_host_start_tag(fnic, sc);
2294                 if (unlikely(tag == SCSI_NO_TAG))
2295                         goto fnic_device_reset_end;
2296                 tag_gen_flag = 1;
2297                 new_sc = 1;
2298         }
2299         io_lock = fnic_io_lock_hash(fnic, sc);
2300         spin_lock_irqsave(io_lock, flags);
2301         io_req = (struct fnic_io_req *)CMD_SP(sc);
2302
2303         /*
2304          * If there is a io_req attached to this command, then use it,
2305          * else allocate a new one.
2306          */
2307         if (!io_req) {
2308                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2309                 if (!io_req) {
2310                         spin_unlock_irqrestore(io_lock, flags);
2311                         goto fnic_device_reset_end;
2312                 }
2313                 memset(io_req, 0, sizeof(*io_req));
2314                 io_req->port_id = rport->port_id;
2315                 CMD_SP(sc) = (char *)io_req;
2316         }
2317         io_req->dr_done = &tm_done;
2318         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2319         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2320         spin_unlock_irqrestore(io_lock, flags);
2321
2322         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2323
2324         /*
2325          * issue the device reset, if enqueue failed, clean up the ioreq
2326          * and break assoc with scsi cmd
2327          */
2328         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2329                 spin_lock_irqsave(io_lock, flags);
2330                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2331                 if (io_req)
2332                         io_req->dr_done = NULL;
2333                 goto fnic_device_reset_clean;
2334         }
2335         spin_lock_irqsave(io_lock, flags);
2336         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2337         spin_unlock_irqrestore(io_lock, flags);
2338
2339         /*
2340          * Wait on the local completion for LUN reset.  The io_req may be
2341          * freed while we wait since we hold no lock.
2342          */
2343         wait_for_completion_timeout(&tm_done,
2344                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2345
2346         spin_lock_irqsave(io_lock, flags);
2347         io_req = (struct fnic_io_req *)CMD_SP(sc);
2348         if (!io_req) {
2349                 spin_unlock_irqrestore(io_lock, flags);
2350                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2351                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2352                 goto fnic_device_reset_end;
2353         }
2354         io_req->dr_done = NULL;
2355
2356         status = CMD_LR_STATUS(sc);
2357
2358         /*
2359          * If lun reset not completed, bail out with failed. io_req
2360          * gets cleaned up during higher levels of EH
2361          */
2362         if (status == FCPIO_INVALID_CODE) {
2363                 atomic64_inc(&reset_stats->device_reset_timeouts);
2364                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2365                               "Device reset timed out\n");
2366                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2367                 spin_unlock_irqrestore(io_lock, flags);
2368                 int_to_scsilun(sc->device->lun, &fc_lun);
2369                 /*
2370                  * Issue abort and terminate on device reset request.
2371                  * If q'ing of terminate fails, retry it after a delay.
2372                  */
2373                 while (1) {
2374                         spin_lock_irqsave(io_lock, flags);
2375                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2376                                 spin_unlock_irqrestore(io_lock, flags);
2377                                 break;
2378                         }
2379                         spin_unlock_irqrestore(io_lock, flags);
2380                         if (fnic_queue_abort_io_req(fnic,
2381                                 tag | FNIC_TAG_DEV_RST,
2382                                 FCPIO_ITMF_ABT_TASK_TERM,
2383                                 fc_lun.scsi_lun, io_req)) {
2384                                 wait_for_completion_timeout(&tm_done,
2385                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2386                         } else {
2387                                 spin_lock_irqsave(io_lock, flags);
2388                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2389                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2390                                 io_req->abts_done = &tm_done;
2391                                 spin_unlock_irqrestore(io_lock, flags);
2392                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2393                                 "Abort and terminate issued on Device reset "
2394                                 "tag 0x%x sc 0x%p\n", tag, sc);
2395                                 break;
2396                         }
2397                 }
2398                 while (1) {
2399                         spin_lock_irqsave(io_lock, flags);
2400                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2401                                 spin_unlock_irqrestore(io_lock, flags);
2402                                 wait_for_completion_timeout(&tm_done,
2403                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2404                                 break;
2405                         } else {
2406                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2407                                 io_req->abts_done = NULL;
2408                                 goto fnic_device_reset_clean;
2409                         }
2410                 }
2411         } else {
2412                 spin_unlock_irqrestore(io_lock, flags);
2413         }
2414
2415         /* Completed, but not successful, clean up the io_req, return fail */
2416         if (status != FCPIO_SUCCESS) {
2417                 spin_lock_irqsave(io_lock, flags);
2418                 FNIC_SCSI_DBG(KERN_DEBUG,
2419                               fnic->lport->host,
2420                               "Device reset completed - failed\n");
2421                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2422                 goto fnic_device_reset_clean;
2423         }
2424
2425         /*
2426          * Clean up any aborts on this lun that have still not
2427          * completed. If any of these fail, then LUN reset fails.
2428          * clean_pending_aborts cleans all cmds on this lun except
2429          * the lun reset cmd. If all cmds get cleaned, the lun reset
2430          * succeeds
2431          */
2432         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2433                 spin_lock_irqsave(io_lock, flags);
2434                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2435                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2436                               "Device reset failed"
2437                               " since could not abort all IOs\n");
2438                 goto fnic_device_reset_clean;
2439         }
2440
2441         /* Clean lun reset command */
2442         spin_lock_irqsave(io_lock, flags);
2443         io_req = (struct fnic_io_req *)CMD_SP(sc);
2444         if (io_req)
2445                 /* Completed, and successful */
2446                 ret = SUCCESS;
2447
2448 fnic_device_reset_clean:
2449         if (io_req)
2450                 CMD_SP(sc) = NULL;
2451
2452         spin_unlock_irqrestore(io_lock, flags);
2453
2454         if (io_req) {
2455                 start_time = io_req->start_time;
2456                 fnic_release_ioreq_buf(fnic, io_req, sc);
2457                 mempool_free(io_req, fnic->io_req_pool);
2458         }
2459
2460 fnic_device_reset_end:
2461         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2462                   sc->request->tag, sc,
2463                   jiffies_to_msecs(jiffies - start_time),
2464                   0, ((u64)sc->cmnd[0] << 32 |
2465                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2466                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2467                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2468
2469         /* free tag if it is allocated */
2470         if (unlikely(tag_gen_flag))
2471                 fnic_scsi_host_end_tag(fnic, sc);
2472
2473         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2474                       "Returning from device reset %s\n",
2475                       (ret == SUCCESS) ?
2476                       "SUCCESS" : "FAILED");
2477
2478         if (ret == FAILED)
2479                 atomic64_inc(&reset_stats->device_reset_failures);
2480
2481         return ret;
2482 }
2483
2484 /* Clean up all IOs, clean up libFC local port */
2485 int fnic_reset(struct Scsi_Host *shost)
2486 {
2487         struct fc_lport *lp;
2488         struct fnic *fnic;
2489         int ret = 0;
2490         struct reset_stats *reset_stats;
2491
2492         lp = shost_priv(shost);
2493         fnic = lport_priv(lp);
2494         reset_stats = &fnic->fnic_stats.reset_stats;
2495
2496         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2497                       "fnic_reset called\n");
2498
2499         atomic64_inc(&reset_stats->fnic_resets);
2500
2501         /*
2502          * Reset local port, this will clean up libFC exchanges,
2503          * reset remote port sessions, and if link is up, begin flogi
2504          */
2505         ret = fc_lport_reset(lp);
2506
2507         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2508                       "Returning from fnic reset %s\n",
2509                       (ret == 0) ?
2510                       "SUCCESS" : "FAILED");
2511
2512         if (ret == 0)
2513                 atomic64_inc(&reset_stats->fnic_reset_completions);
2514         else
2515                 atomic64_inc(&reset_stats->fnic_reset_failures);
2516
2517         return ret;
2518 }
2519
2520 /*
2521  * SCSI Error handling calls driver's eh_host_reset if all prior
2522  * error handling levels return FAILED. If host reset completes
2523  * successfully, and if link is up, then Fabric login begins.
2524  *
2525  * Host Reset is the highest level of error recovery. If this fails, then
2526  * host is offlined by SCSI.
2527  *
2528  */
2529 int fnic_host_reset(struct scsi_cmnd *sc)
2530 {
2531         int ret;
2532         unsigned long wait_host_tmo;
2533         struct Scsi_Host *shost = sc->device->host;
2534         struct fc_lport *lp = shost_priv(shost);
2535         struct fnic *fnic = lport_priv(lp);
2536         unsigned long flags;
2537
2538         spin_lock_irqsave(&fnic->fnic_lock, flags);
2539         if (!fnic->internal_reset_inprogress) {
2540                 fnic->internal_reset_inprogress = true;
2541         } else {
2542                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2543                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2544                         "host reset in progress skipping another host reset\n");
2545                 return SUCCESS;
2546         }
2547         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2548
2549         /*
2550          * If fnic_reset is successful, wait for fabric login to complete
2551          * scsi-ml tries to send a TUR to every device if host reset is
2552          * successful, so before returning to scsi, fabric should be up
2553          */
2554         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2555         if (ret == SUCCESS) {
2556                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2557                 ret = FAILED;
2558                 while (time_before(jiffies, wait_host_tmo)) {
2559                         if ((lp->state == LPORT_ST_READY) &&
2560                             (lp->link_up)) {
2561                                 ret = SUCCESS;
2562                                 break;
2563                         }
2564                         ssleep(1);
2565                 }
2566         }
2567
2568         spin_lock_irqsave(&fnic->fnic_lock, flags);
2569         fnic->internal_reset_inprogress = false;
2570         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2571         return ret;
2572 }
2573
2574 /*
2575  * This fxn is called from libFC when host is removed
2576  */
2577 void fnic_scsi_abort_io(struct fc_lport *lp)
2578 {
2579         int err = 0;
2580         unsigned long flags;
2581         enum fnic_state old_state;
2582         struct fnic *fnic = lport_priv(lp);
2583         DECLARE_COMPLETION_ONSTACK(remove_wait);
2584
2585         /* Issue firmware reset for fnic, wait for reset to complete */
2586 retry_fw_reset:
2587         spin_lock_irqsave(&fnic->fnic_lock, flags);
2588         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) &&
2589                      fnic->link_events) {
2590                 /* fw reset is in progress, poll for its completion */
2591                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2592                 schedule_timeout(msecs_to_jiffies(100));
2593                 goto retry_fw_reset;
2594         }
2595
2596         fnic->remove_wait = &remove_wait;
2597         old_state = fnic->state;
2598         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2599         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2600         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2601
2602         err = fnic_fw_reset_handler(fnic);
2603         if (err) {
2604                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2605                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2606                         fnic->state = old_state;
2607                 fnic->remove_wait = NULL;
2608                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2609                 return;
2610         }
2611
2612         /* Wait for firmware reset to complete */
2613         wait_for_completion_timeout(&remove_wait,
2614                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2615
2616         spin_lock_irqsave(&fnic->fnic_lock, flags);
2617         fnic->remove_wait = NULL;
2618         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2619                       "fnic_scsi_abort_io %s\n",
2620                       (fnic->state == FNIC_IN_ETH_MODE) ?
2621                       "SUCCESS" : "FAILED");
2622         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2623
2624 }
2625
2626 /*
2627  * This fxn called from libFC to clean up driver IO state on link down
2628  */
2629 void fnic_scsi_cleanup(struct fc_lport *lp)
2630 {
2631         unsigned long flags;
2632         enum fnic_state old_state;
2633         struct fnic *fnic = lport_priv(lp);
2634
2635         /* issue fw reset */
2636 retry_fw_reset:
2637         spin_lock_irqsave(&fnic->fnic_lock, flags);
2638         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2639                 /* fw reset is in progress, poll for its completion */
2640                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2641                 schedule_timeout(msecs_to_jiffies(100));
2642                 goto retry_fw_reset;
2643         }
2644         old_state = fnic->state;
2645         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2646         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2647         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2648
2649         if (fnic_fw_reset_handler(fnic)) {
2650                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2651                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2652                         fnic->state = old_state;
2653                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2654         }
2655
2656 }
2657
2658 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2659 {
2660 }
2661
2662 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2663 {
2664         struct fnic *fnic = lport_priv(lp);
2665
2666         /* Non-zero sid, nothing to do */
2667         if (sid)
2668                 goto call_fc_exch_mgr_reset;
2669
2670         if (did) {
2671                 fnic_rport_exch_reset(fnic, did);
2672                 goto call_fc_exch_mgr_reset;
2673         }
2674
2675         /*
2676          * sid = 0, did = 0
2677          * link down or device being removed
2678          */
2679         if (!fnic->in_remove)
2680                 fnic_scsi_cleanup(lp);
2681         else
2682                 fnic_scsi_abort_io(lp);
2683
2684         /* call libFC exch mgr reset to reset its exchanges */
2685 call_fc_exch_mgr_reset:
2686         fc_exch_mgr_reset(lp, sid, did);
2687
2688 }
2689
2690 static bool fnic_abts_pending_iter(struct scsi_cmnd *sc, void *data,
2691                                    bool reserved)
2692 {
2693         struct fnic_pending_aborts_iter_data *iter_data = data;
2694         struct fnic *fnic = iter_data->fnic;
2695         int cmd_state;
2696         struct fnic_io_req *io_req;
2697         spinlock_t *io_lock;
2698         unsigned long flags;
2699
2700         /*
2701          * ignore this lun reset cmd or cmds that do not belong to
2702          * this lun
2703          */
2704         if (iter_data->lr_sc && sc == iter_data->lr_sc)
2705                 return true;
2706         if (iter_data->lun_dev && sc->device != iter_data->lun_dev)
2707                 return true;
2708
2709         io_lock = fnic_io_lock_hash(fnic, sc);
2710         spin_lock_irqsave(io_lock, flags);
2711
2712         io_req = (struct fnic_io_req *)CMD_SP(sc);
2713         if (!io_req) {
2714                 spin_unlock_irqrestore(io_lock, flags);
2715                 return true;
2716         }
2717
2718         /*
2719          * Found IO that is still pending with firmware and
2720          * belongs to the LUN that we are resetting
2721          */
2722         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2723                       "Found IO in %s on lun\n",
2724                       fnic_ioreq_state_to_str(CMD_STATE(sc)));
2725         cmd_state = CMD_STATE(sc);
2726         spin_unlock_irqrestore(io_lock, flags);
2727         if (cmd_state == FNIC_IOREQ_ABTS_PENDING)
2728                 iter_data->ret = 1;
2729
2730         return iter_data->ret ? false : true;
2731 }
2732
2733 /*
2734  * fnic_is_abts_pending() is a helper function that
2735  * walks through tag map to check if there is any IOs pending,if there is one,
2736  * then it returns 1 (true), otherwise 0 (false)
2737  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2738  * otherwise, it checks for all IOs.
2739  */
2740 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2741 {
2742         struct fnic_pending_aborts_iter_data iter_data = {
2743                 .fnic = fnic,
2744                 .lun_dev = NULL,
2745                 .ret = 0,
2746         };
2747
2748         if (lr_sc) {
2749                 iter_data.lun_dev = lr_sc->device;
2750                 iter_data.lr_sc = lr_sc;
2751         }
2752
2753         /* walk again to check, if IOs are still pending in fw */
2754         scsi_host_busy_iter(fnic->lport->host,
2755                             fnic_abts_pending_iter, &iter_data);
2756
2757         return iter_data.ret;
2758 }