drivers/scsi/fnic/fnic_scsi.c

   1 /*
   2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  */
  18 #include <linux/mempool.h>
  19 #include <linux/errno.h>
  20 #include <linux/init.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/pci.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/if_ether.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/delay.h>
  29 #include <linux/gfp.h>
  30 #include <scsi/scsi.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_cmnd.h>
  34 #include <scsi/scsi_tcq.h>
  35 #include <scsi/fc/fc_els.h>
  36 #include <scsi/fc/fc_fcoe.h>
  37 #include <scsi/libfc.h>
  38 #include <scsi/fc_frame.h>
  39 #include "fnic_io.h"
  40 #include "fnic.h"
  41
  42 const char *fnic_state_str[] = {
  43         [FNIC_IN_FC_MODE] =           "FNIC_IN_FC_MODE",
  44         [FNIC_IN_FC_TRANS_ETH_MODE] = "FNIC_IN_FC_TRANS_ETH_MODE",
  45         [FNIC_IN_ETH_MODE] =          "FNIC_IN_ETH_MODE",
  46         [FNIC_IN_ETH_TRANS_FC_MODE] = "FNIC_IN_ETH_TRANS_FC_MODE",
  47 };
  48
  49 static const char *fnic_ioreq_state_str[] = {
  50         [FNIC_IOREQ_NOT_INITED] = "FNIC_IOREQ_NOT_INITED",
  51         [FNIC_IOREQ_CMD_PENDING] = "FNIC_IOREQ_CMD_PENDING",
  52         [FNIC_IOREQ_ABTS_PENDING] = "FNIC_IOREQ_ABTS_PENDING",
  53         [FNIC_IOREQ_ABTS_COMPLETE] = "FNIC_IOREQ_ABTS_COMPLETE",
  54         [FNIC_IOREQ_CMD_COMPLETE] = "FNIC_IOREQ_CMD_COMPLETE",
  55 };
  56
  57 static const char *fcpio_status_str[] =  {
  58         [FCPIO_SUCCESS] = "FCPIO_SUCCESS", /*0x0*/
  59         [FCPIO_INVALID_HEADER] = "FCPIO_INVALID_HEADER",
  60         [FCPIO_OUT_OF_RESOURCE] = "FCPIO_OUT_OF_RESOURCE",
  61         [FCPIO_INVALID_PARAM] = "FCPIO_INVALID_PARAM]",
  62         [FCPIO_REQ_NOT_SUPPORTED] = "FCPIO_REQ_NOT_SUPPORTED",
  63         [FCPIO_IO_NOT_FOUND] = "FCPIO_IO_NOT_FOUND",
  64         [FCPIO_ABORTED] = "FCPIO_ABORTED", /*0x41*/
  65         [FCPIO_TIMEOUT] = "FCPIO_TIMEOUT",
  66         [FCPIO_SGL_INVALID] = "FCPIO_SGL_INVALID",
  67         [FCPIO_MSS_INVALID] = "FCPIO_MSS_INVALID",
  68         [FCPIO_DATA_CNT_MISMATCH] = "FCPIO_DATA_CNT_MISMATCH",
  69         [FCPIO_FW_ERR] = "FCPIO_FW_ERR",
  70         [FCPIO_ITMF_REJECTED] = "FCPIO_ITMF_REJECTED",
  71         [FCPIO_ITMF_FAILED] = "FCPIO_ITMF_FAILED",
  72         [FCPIO_ITMF_INCORRECT_LUN] = "FCPIO_ITMF_INCORRECT_LUN",
  73         [FCPIO_CMND_REJECTED] = "FCPIO_CMND_REJECTED",
  74         [FCPIO_NO_PATH_AVAIL] = "FCPIO_NO_PATH_AVAIL",
  75         [FCPIO_PATH_FAILED] = "FCPIO_PATH_FAILED",
  76         [FCPIO_LUNMAP_CHNG_PEND] = "FCPIO_LUNHMAP_CHNG_PEND",
  77 };
  78
  79 const char *fnic_state_to_str(unsigned int state)
  80 {
  81         if (state >= ARRAY_SIZE(fnic_state_str) || !fnic_state_str[state])
  82                 return "unknown";
  83
  84         return fnic_state_str[state];
  85 }
  86
  87 static const char *fnic_ioreq_state_to_str(unsigned int state)
  88 {
  89         if (state >= ARRAY_SIZE(fnic_ioreq_state_str) ||
  90             !fnic_ioreq_state_str[state])
  91                 return "unknown";
  92
  93         return fnic_ioreq_state_str[state];
  94 }
  95
  96 static const char *fnic_fcpio_status_to_str(unsigned int status)
  97 {
  98         if (status >= ARRAY_SIZE(fcpio_status_str) || !fcpio_status_str[status])
  99                 return "unknown";
 100
 101         return fcpio_status_str[status];
 102 }
 103
 104 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id);
 105
 106 static inline spinlock_t *fnic_io_lock_hash(struct fnic *fnic,
 107                                             struct scsi_cmnd *sc)
 108 {
 109         u32 hash = sc->request->tag & (FNIC_IO_LOCKS - 1);
 110
 111         return &fnic->io_req_lock[hash];
 112 }
 113
 114 static inline spinlock_t *fnic_io_lock_tag(struct fnic *fnic,
 115                                             int tag)
 116 {
 117         return &fnic->io_req_lock[tag & (FNIC_IO_LOCKS - 1)];
 118 }
 119
 120 /*
 121  * Unmap the data buffer and sense buffer for an io_req,
 122  * also unmap and free the device-private scatter/gather list.
 123  */
 124 static void fnic_release_ioreq_buf(struct fnic *fnic,
 125                                    struct fnic_io_req *io_req,
 126                                    struct scsi_cmnd *sc)
 127 {
 128         if (io_req->sgl_list_pa)
 129                 pci_unmap_single(fnic->pdev, io_req->sgl_list_pa,
 130                                  sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
 131                                  PCI_DMA_TODEVICE);
 132         scsi_dma_unmap(sc);
 133
 134         if (io_req->sgl_cnt)
 135                 mempool_free(io_req->sgl_list_alloc,
 136                              fnic->io_sgl_pool[io_req->sgl_type]);
 137         if (io_req->sense_buf_pa)
 138                 pci_unmap_single(fnic->pdev, io_req->sense_buf_pa,
 139                                  SCSI_SENSE_BUFFERSIZE, PCI_DMA_FROMDEVICE);
 140 }
 141
 142 /* Free up Copy Wq descriptors. Called with copy_wq lock held */
 143 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
 144 {
 145         /* if no Ack received from firmware, then nothing to clean */
 146         if (!fnic->fw_ack_recd[0])
 147                 return 1;
 148
 149         /*
 150          * Update desc_available count based on number of freed descriptors
 151          * Account for wraparound
 152          */
 153         if (wq->to_clean_index <= fnic->fw_ack_index[0])
 154                 wq->ring.desc_avail += (fnic->fw_ack_index[0]
 155                                         - wq->to_clean_index + 1);
 156         else
 157                 wq->ring.desc_avail += (wq->ring.desc_count
 158                                         - wq->to_clean_index
 159                                         + fnic->fw_ack_index[0] + 1);
 160
 161         /*
 162          * just bump clean index to ack_index+1 accounting for wraparound
 163          * this will essentially free up all descriptors between
 164          * to_clean_index and fw_ack_index, both inclusive
 165          */
 166         wq->to_clean_index =
 167                 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
 168
 169         /* we have processed the acks received so far */
 170         fnic->fw_ack_recd[0] = 0;
 171         return 0;
 172 }
 173
 174
 175 /**
 176  * __fnic_set_state_flags
 177  * Sets/Clears bits in fnic's state_flags
 178  **/
 179 void
 180 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
 181                         unsigned long clearbits)
 182 {
 183         struct Scsi_Host *host = fnic->lport->host;
 184         int sh_locked = spin_is_locked(host->host_lock);
 185         unsigned long flags = 0;
 186
 187         if (!sh_locked)
 188                 spin_lock_irqsave(host->host_lock, flags);
 189
 190         if (clearbits)
 191                 fnic->state_flags &= ~st_flags;
 192         else
 193                 fnic->state_flags |= st_flags;
 194
 195         if (!sh_locked)
 196                 spin_unlock_irqrestore(host->host_lock, flags);
 197
 198         return;
 199 }
 200
 201
 202 /*
 203  * fnic_fw_reset_handler
 204  * Routine to send reset msg to fw
 205  */
 206 int fnic_fw_reset_handler(struct fnic *fnic)
 207 {
 208         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 209         int ret = 0;
 210         unsigned long flags;
 211
 212         /* indicate fwreset to io path */
 213         fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET);
 214
 215         skb_queue_purge(&fnic->frame_queue);
 216         skb_queue_purge(&fnic->tx_queue);
 217
 218         /* wait for io cmpl */
 219         while (atomic_read(&fnic->in_flight))
 220                 schedule_timeout(msecs_to_jiffies(1));
 221
 222         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 223
 224         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 225                 free_wq_copy_descs(fnic, wq);
 226
 227         if (!vnic_wq_copy_desc_avail(wq))
 228                 ret = -EAGAIN;
 229         else {
 230                 fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);
 231                 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 232                 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 233                           atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 234                         atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 235                                 atomic64_read(
 236                                   &fnic->fnic_stats.fw_stats.active_fw_reqs));
 237         }
 238
 239         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 240
 241         if (!ret) {
 242                 atomic64_inc(&fnic->fnic_stats.reset_stats.fw_resets);
 243                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 244                               "Issued fw reset\n");
 245         } else {
 246                 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 247                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 248                               "Failed to issue fw reset\n");
 249         }
 250
 251         return ret;
 252 }
 253
 254
 255 /*
 256  * fnic_flogi_reg_handler
 257  * Routine to send flogi register msg to fw
 258  */
 259 int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
 260 {
 261         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 262         enum fcpio_flogi_reg_format_type format;
 263         struct fc_lport *lp = fnic->lport;
 264         u8 gw_mac[ETH_ALEN];
 265         int ret = 0;
 266         unsigned long flags;
 267
 268         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 269
 270         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 271                 free_wq_copy_descs(fnic, wq);
 272
 273         if (!vnic_wq_copy_desc_avail(wq)) {
 274                 ret = -EAGAIN;
 275                 goto flogi_reg_ioreq_end;
 276         }
 277
 278         if (fnic->ctlr.map_dest) {
 279                 memset(gw_mac, 0xff, ETH_ALEN);
 280                 format = FCPIO_FLOGI_REG_DEF_DEST;
 281         } else {
 282                 memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
 283                 format = FCPIO_FLOGI_REG_GW_DEST;
 284         }
 285
 286         if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
 287                 fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
 288                                                 fc_id, gw_mac,
 289                                                 fnic->data_src_addr,
 290                                                 lp->r_a_tov, lp->e_d_tov);
 291                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 292                               "FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
 293                               fc_id, fnic->data_src_addr, gw_mac);
 294         } else {
 295                 fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
 296                                                   format, fc_id, gw_mac);
 297                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 298                               "FLOGI reg issued fcid %x map %d dest %pM\n",
 299                               fc_id, fnic->ctlr.map_dest, gw_mac);
 300         }
 301
 302         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 303         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 304                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 305                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 306                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 307
 308 flogi_reg_ioreq_end:
 309         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 310         return ret;
 311 }
 312
 313 /*
 314  * fnic_queue_wq_copy_desc
 315  * Routine to enqueue a wq copy desc
 316  */
 317 static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
 318                                           struct vnic_wq_copy *wq,
 319                                           struct fnic_io_req *io_req,
 320                                           struct scsi_cmnd *sc,
 321                                           int sg_count)
 322 {
 323         struct scatterlist *sg;
 324         struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
 325         struct fc_rport_libfc_priv *rp = rport->dd_data;
 326         struct host_sg_desc *desc;
 327         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
 328         unsigned int i;
 329         unsigned long intr_flags;
 330         int flags;
 331         u8 exch_flags;
 332         struct scsi_lun fc_lun;
 333         int r;
 334
 335         if (sg_count) {
 336                 /* For each SGE, create a device desc entry */
 337                 desc = io_req->sgl_list;
 338                 for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
 339                         desc->addr = cpu_to_le64(sg_dma_address(sg));
 340                         desc->len = cpu_to_le32(sg_dma_len(sg));
 341                         desc->_resvd = 0;
 342                         desc++;
 343                 }
 344
 345                 io_req->sgl_list_pa = pci_map_single
 346                         (fnic->pdev,
 347                          io_req->sgl_list,
 348                          sizeof(io_req->sgl_list[0]) * sg_count,
 349                          PCI_DMA_TODEVICE);
 350
 351                 r = pci_dma_mapping_error(fnic->pdev, io_req->sgl_list_pa);
 352                 if (r) {
 353                         printk(KERN_ERR "PCI mapping failed with error %d\n", r);
 354                         return SCSI_MLQUEUE_HOST_BUSY;
 355                 }
 356         }
 357
 358         io_req->sense_buf_pa = pci_map_single(fnic->pdev,
 359                                               sc->sense_buffer,
 360                                               SCSI_SENSE_BUFFERSIZE,
 361                                               PCI_DMA_FROMDEVICE);
 362
 363         r = pci_dma_mapping_error(fnic->pdev, io_req->sense_buf_pa);
 364         if (r) {
 365                 pci_unmap_single(fnic->pdev, io_req->sgl_list_pa,
 366                                 sizeof(io_req->sgl_list[0]) * sg_count,
 367                                 PCI_DMA_TODEVICE);
 368                 printk(KERN_ERR "PCI mapping failed with error %d\n", r);
 369                 return SCSI_MLQUEUE_HOST_BUSY;
 370         }
 371
 372         int_to_scsilun(sc->device->lun, &fc_lun);
 373
 374         /* Enqueue the descriptor in the Copy WQ */
 375         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
 376
 377         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 378                 free_wq_copy_descs(fnic, wq);
 379
 380         if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
 381                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 382                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 383                           "fnic_queue_wq_copy_desc failure - no descriptors\n");
 384                 atomic64_inc(&misc_stats->io_cpwq_alloc_failures);
 385                 return SCSI_MLQUEUE_HOST_BUSY;
 386         }
 387
 388         flags = 0;
 389         if (sc->sc_data_direction == DMA_FROM_DEVICE)
 390                 flags = FCPIO_ICMND_RDDATA;
 391         else if (sc->sc_data_direction == DMA_TO_DEVICE)
 392                 flags = FCPIO_ICMND_WRDATA;
 393
 394         exch_flags = 0;
 395         if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
 396             (rp->flags & FC_RP_FLAGS_RETRY))
 397                 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
 398
 399         fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
 400                                          0, exch_flags, io_req->sgl_cnt,
 401                                          SCSI_SENSE_BUFFERSIZE,
 402                                          io_req->sgl_list_pa,
 403                                          io_req->sense_buf_pa,
 404                                          0, /* scsi cmd ref, always 0 */
 405                                          FCPIO_ICMND_PTA_SIMPLE,
 406                                                 /* scsi pri and tag */
 407                                          flags, /* command flags */
 408                                          sc->cmnd, sc->cmd_len,
 409                                          scsi_bufflen(sc),
 410                                          fc_lun.scsi_lun, io_req->port_id,
 411                                          rport->maxframe_size, rp->r_a_tov,
 412                                          rp->e_d_tov);
 413
 414         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 415         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 416                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 417                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 418                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 419
 420         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 421         return 0;
 422 }
 423
 424 /*
 425  * fnic_queuecommand
 426  * Routine to send a scsi cdb
 427  * Called with host_lock held and interrupts disabled.
 428  */
 429 static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 430 {
 431         struct fc_lport *lp = shost_priv(sc->device->host);
 432         struct fc_rport *rport;
 433         struct fnic_io_req *io_req = NULL;
 434         struct fnic *fnic = lport_priv(lp);
 435         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 436         struct vnic_wq_copy *wq;
 437         int ret;
 438         u64 cmd_trace;
 439         int sg_count = 0;
 440         unsigned long flags = 0;
 441         unsigned long ptr;
 442         spinlock_t *io_lock = NULL;
 443         int io_lock_acquired = 0;
 444         struct fc_rport_libfc_priv *rp;
 445
 446         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
 447                 return SCSI_MLQUEUE_HOST_BUSY;
 448
 449         rport = starget_to_rport(scsi_target(sc->device));
 450         if (!rport) {
 451                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 452                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 453                 sc->result = DID_NO_CONNECT << 16;
 454                 done(sc);
 455                 return 0;
 456         }
 457
 458         ret = fc_remote_port_chkready(rport);
 459         if (ret) {
 460                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 461                                 "rport is not ready\n");
 462                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 463                 sc->result = ret;
 464                 done(sc);
 465                 return 0;
 466         }
 467
 468         rp = rport->dd_data;
 469         if (!rp || rp->rp_state != RPORT_ST_READY) {
 470                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 471                                 "returning DID_NO_CONNECT for IO as rport is removed\n");
 472                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 473                 sc->result = DID_NO_CONNECT<<16;
 474                 done(sc);
 475                 return 0;
 476         }
 477
 478         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 479                 return SCSI_MLQUEUE_HOST_BUSY;
 480
 481         atomic_inc(&fnic->in_flight);
 482
 483         /*
 484          * Release host lock, use driver resource specific locks from here.
 485          * Don't re-enable interrupts in case they were disabled prior to the
 486          * caller disabling them.
 487          */
 488         spin_unlock(lp->host->host_lock);
 489         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 490         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 491
 492         /* Get a new io_req for this SCSI IO */
 493         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 494         if (!io_req) {
 495                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 496                 ret = SCSI_MLQUEUE_HOST_BUSY;
 497                 goto out;
 498         }
 499         memset(io_req, 0, sizeof(*io_req));
 500
 501         /* Map the data buffer */
 502         sg_count = scsi_dma_map(sc);
 503         if (sg_count < 0) {
 504                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 505                           sc->request->tag, sc, 0, sc->cmnd[0],
 506                           sg_count, CMD_STATE(sc));
 507                 mempool_free(io_req, fnic->io_req_pool);
 508                 goto out;
 509         }
 510
 511         /* Determine the type of scatter/gather list we need */
 512         io_req->sgl_cnt = sg_count;
 513         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 514         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 515                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 516
 517         if (sg_count) {
 518                 io_req->sgl_list =
 519                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 520                                       GFP_ATOMIC);
 521                 if (!io_req->sgl_list) {
 522                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 523                         ret = SCSI_MLQUEUE_HOST_BUSY;
 524                         scsi_dma_unmap(sc);
 525                         mempool_free(io_req, fnic->io_req_pool);
 526                         goto out;
 527                 }
 528
 529                 /* Cache sgl list allocated address before alignment */
 530                 io_req->sgl_list_alloc = io_req->sgl_list;
 531                 ptr = (unsigned long) io_req->sgl_list;
 532                 if (ptr % FNIC_SG_DESC_ALIGN) {
 533                         io_req->sgl_list = (struct host_sg_desc *)
 534                                 (((unsigned long) ptr
 535                                   + FNIC_SG_DESC_ALIGN - 1)
 536                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 537                 }
 538         }
 539
 540         /*
 541         * Will acquire lock defore setting to IO initialized.
 542         */
 543
 544         io_lock = fnic_io_lock_hash(fnic, sc);
 545         spin_lock_irqsave(io_lock, flags);
 546
 547         /* initialize rest of io_req */
 548         io_lock_acquired = 1;
 549         io_req->port_id = rport->port_id;
 550         io_req->start_time = jiffies;
 551         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 552         CMD_SP(sc) = (char *)io_req;
 553         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 554         sc->scsi_done = done;
 555
 556         /* create copy wq desc and enqueue it */
 557         wq = &fnic->wq_copy[0];
 558         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 559         if (ret) {
 560                 /*
 561                  * In case another thread cancelled the request,
 562                  * refetch the pointer under the lock.
 563                  */
 564                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 565                           sc->request->tag, sc, 0, 0, 0,
 566                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 567                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 568                 CMD_SP(sc) = NULL;
 569                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 570                 spin_unlock_irqrestore(io_lock, flags);
 571                 if (io_req) {
 572                         fnic_release_ioreq_buf(fnic, io_req, sc);
 573                         mempool_free(io_req, fnic->io_req_pool);
 574                 }
 575                 atomic_dec(&fnic->in_flight);
 576                 /* acquire host lock before returning to SCSI */
 577                 spin_lock(lp->host->host_lock);
 578                 return ret;
 579         } else {
 580                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 581                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 582                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 583                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 584                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 585                              atomic64_read(&fnic_stats->io_stats.active_ios));
 586
 587                 /* REVISIT: Use per IO lock in the final code */
 588                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 589         }
 590 out:
 591         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 592                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 593                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 594                         sc->cmnd[5]);
 595
 596         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 597                   sc->request->tag, sc, io_req,
 598                   sg_count, cmd_trace,
 599                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 600
 601         /* if only we issued IO, will we have the io lock */
 602         if (io_lock_acquired)
 603                 spin_unlock_irqrestore(io_lock, flags);
 604
 605         atomic_dec(&fnic->in_flight);
 606         /* acquire host lock before returning to SCSI */
 607         spin_lock(lp->host->host_lock);
 608         return ret;
 609 }
 610
 611 DEF_SCSI_QCMD(fnic_queuecommand)
 612
 613 /*
 614  * fnic_fcpio_fw_reset_cmpl_handler
 615  * Routine to handle fw reset completion
 616  */
 617 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 618                                             struct fcpio_fw_req *desc)
 619 {
 620         u8 type;
 621         u8 hdr_status;
 622         struct fcpio_tag tag;
 623         int ret = 0;
 624         unsigned long flags;
 625         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 626
 627         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 628
 629         atomic64_inc(&reset_stats->fw_reset_completions);
 630
 631         /* Clean up all outstanding io requests */
 632         fnic_cleanup_io(fnic, SCSI_NO_TAG);
 633
 634         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 635         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 636
 637         spin_lock_irqsave(&fnic->fnic_lock, flags);
 638
 639         /* fnic should be in FC_TRANS_ETH_MODE */
 640         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 641                 /* Check status of reset completion */
 642                 if (!hdr_status) {
 643                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 644                                       "reset cmpl success\n");
 645                         /* Ready to send flogi out */
 646                         fnic->state = FNIC_IN_ETH_MODE;
 647                 } else {
 648                         FNIC_SCSI_DBG(KERN_DEBUG,
 649                                       fnic->lport->host,
 650                                       "fnic fw_reset : failed %s\n",
 651                                       fnic_fcpio_status_to_str(hdr_status));
 652
 653                         /*
 654                          * Unable to change to eth mode, cannot send out flogi
 655                          * Change state to fc mode, so that subsequent Flogi
 656                          * requests from libFC will cause more attempts to
 657                          * reset the firmware. Free the cached flogi
 658                          */
 659                         fnic->state = FNIC_IN_FC_MODE;
 660                         atomic64_inc(&reset_stats->fw_reset_failures);
 661                         ret = -1;
 662                 }
 663         } else {
 664                 FNIC_SCSI_DBG(KERN_DEBUG,
 665                               fnic->lport->host,
 666                               "Unexpected state %s while processing"
 667                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 668                 atomic64_inc(&reset_stats->fw_reset_failures);
 669                 ret = -1;
 670         }
 671
 672         /* Thread removing device blocks till firmware reset is complete */
 673         if (fnic->remove_wait)
 674                 complete(fnic->remove_wait);
 675
 676         /*
 677          * If fnic is being removed, or fw reset failed
 678          * free the flogi frame. Else, send it out
 679          */
 680         if (fnic->remove_wait || ret) {
 681                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 682                 skb_queue_purge(&fnic->tx_queue);
 683                 goto reset_cmpl_handler_end;
 684         }
 685
 686         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 687
 688         fnic_flush_tx(fnic);
 689
 690  reset_cmpl_handler_end:
 691         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 692
 693         return ret;
 694 }
 695
 696 /*
 697  * fnic_fcpio_flogi_reg_cmpl_handler
 698  * Routine to handle flogi register completion
 699  */
 700 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 701                                              struct fcpio_fw_req *desc)
 702 {
 703         u8 type;
 704         u8 hdr_status;
 705         struct fcpio_tag tag;
 706         int ret = 0;
 707         unsigned long flags;
 708
 709         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 710
 711         /* Update fnic state based on status of flogi reg completion */
 712         spin_lock_irqsave(&fnic->fnic_lock, flags);
 713
 714         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 715
 716                 /* Check flogi registration completion status */
 717                 if (!hdr_status) {
 718                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 719                                       "flog reg succeeded\n");
 720                         fnic->state = FNIC_IN_FC_MODE;
 721                 } else {
 722                         FNIC_SCSI_DBG(KERN_DEBUG,
 723                                       fnic->lport->host,
 724                                       "fnic flogi reg :failed %s\n",
 725                                       fnic_fcpio_status_to_str(hdr_status));
 726                         fnic->state = FNIC_IN_ETH_MODE;
 727                         ret = -1;
 728                 }
 729         } else {
 730                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 731                               "Unexpected fnic state %s while"
 732                               " processing flogi reg completion\n",
 733                               fnic_state_to_str(fnic->state));
 734                 ret = -1;
 735         }
 736
 737         if (!ret) {
 738                 if (fnic->stop_rx_link_events) {
 739                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 740                         goto reg_cmpl_handler_end;
 741                 }
 742                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 743
 744                 fnic_flush_tx(fnic);
 745                 queue_work(fnic_event_queue, &fnic->frame_work);
 746         } else {
 747                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 748         }
 749
 750 reg_cmpl_handler_end:
 751         return ret;
 752 }
 753
 754 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 755                                         u16 request_out)
 756 {
 757         if (wq->to_clean_index <= wq->to_use_index) {
 758                 /* out of range, stale request_out index */
 759                 if (request_out < wq->to_clean_index ||
 760                     request_out >= wq->to_use_index)
 761                         return 0;
 762         } else {
 763                 /* out of range, stale request_out index */
 764                 if (request_out < wq->to_clean_index &&
 765                     request_out >= wq->to_use_index)
 766                         return 0;
 767         }
 768         /* request_out index is in range */
 769         return 1;
 770 }
 771
 772
 773 /*
 774  * Mark that ack received and store the Ack index. If there are multiple
 775  * acks received before Tx thread cleans it up, the latest value will be
 776  * used which is correct behavior. This state should be in the copy Wq
 777  * instead of in the fnic
 778  */
 779 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 780                                           unsigned int cq_index,
 781                                           struct fcpio_fw_req *desc)
 782 {
 783         struct vnic_wq_copy *wq;
 784         u16 request_out = desc->u.ack.request_out;
 785         unsigned long flags;
 786         u64 *ox_id_tag = (u64 *)(void *)desc;
 787
 788         /* mark the ack state */
 789         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 790         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 791
 792         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 793         if (is_ack_index_in_range(wq, request_out)) {
 794                 fnic->fw_ack_index[0] = request_out;
 795                 fnic->fw_ack_recd[0] = 1;
 796         } else
 797                 atomic64_inc(
 798                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 799
 800         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 801         FNIC_TRACE(fnic_fcpio_ack_handler,
 802                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 803                   ox_id_tag[4], ox_id_tag[5]);
 804 }
 805
 806 /*
 807  * fnic_fcpio_icmnd_cmpl_handler
 808  * Routine to handle icmnd completions
 809  */
 810 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 811                                          struct fcpio_fw_req *desc)
 812 {
 813         u8 type;
 814         u8 hdr_status;
 815         struct fcpio_tag tag;
 816         u32 id;
 817         u64 xfer_len = 0;
 818         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 819         struct fnic_io_req *io_req;
 820         struct scsi_cmnd *sc;
 821         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 822         unsigned long flags;
 823         spinlock_t *io_lock;
 824         u64 cmd_trace;
 825         unsigned long start_time;
 826
 827         /* Decode the cmpl description to get the io_req id */
 828         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 829         fcpio_tag_id_dec(&tag, &id);
 830         icmnd_cmpl = &desc->u.icmnd_cmpl;
 831
 832         if (id >= fnic->fnic_max_tag_id) {
 833                 shost_printk(KERN_ERR, fnic->lport->host,
 834                         "Tag out of range tag %x hdr status = %s\n",
 835                              id, fnic_fcpio_status_to_str(hdr_status));
 836                 return;
 837         }
 838
 839         sc = scsi_host_find_tag(fnic->lport->host, id);
 840         WARN_ON_ONCE(!sc);
 841         if (!sc) {
 842                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 843                 shost_printk(KERN_ERR, fnic->lport->host,
 844                           "icmnd_cmpl sc is null - "
 845                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 846                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 847                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 848                           fnic->lport->host->host_no, id,
 849                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 850                           (u64)icmnd_cmpl->_resvd0[0]),
 851                           ((u64)hdr_status << 16 |
 852                           (u64)icmnd_cmpl->scsi_status << 8 |
 853                           (u64)icmnd_cmpl->flags), desc,
 854                           (u64)icmnd_cmpl->residual, 0);
 855                 return;
 856         }
 857
 858         io_lock = fnic_io_lock_hash(fnic, sc);
 859         spin_lock_irqsave(io_lock, flags);
 860         io_req = (struct fnic_io_req *)CMD_SP(sc);
 861         WARN_ON_ONCE(!io_req);
 862         if (!io_req) {
 863                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 864                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 865                 spin_unlock_irqrestore(io_lock, flags);
 866                 shost_printk(KERN_ERR, fnic->lport->host,
 867                           "icmnd_cmpl io_req is null - "
 868                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 869                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 870                 return;
 871         }
 872         start_time = io_req->start_time;
 873
 874         /* firmware completed the io */
 875         io_req->io_completed = 1;
 876
 877         /*
 878          *  if SCSI-ML has already issued abort on this command,
 879          *  set completion of the IO. The abts path will clean it up
 880          */
 881         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 882
 883                 /*
 884                  * set the FNIC_IO_DONE so that this doesn't get
 885                  * flagged as 'out of order' if it was not aborted
 886                  */
 887                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 888                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 889                 spin_unlock_irqrestore(io_lock, flags);
 890                 if(FCPIO_ABORTED == hdr_status)
 891                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 892
 893                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 894                         "icmnd_cmpl abts pending "
 895                           "hdr status = %s tag = 0x%x sc = 0x%p"
 896                           "scsi_status = %x residual = %d\n",
 897                           fnic_fcpio_status_to_str(hdr_status),
 898                           id, sc,
 899                           icmnd_cmpl->scsi_status,
 900                           icmnd_cmpl->residual);
 901                 return;
 902         }
 903
 904         /* Mark the IO as complete */
 905         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 906
 907         icmnd_cmpl = &desc->u.icmnd_cmpl;
 908
 909         switch (hdr_status) {
 910         case FCPIO_SUCCESS:
 911                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 912                 xfer_len = scsi_bufflen(sc);
 913                 scsi_set_resid(sc, icmnd_cmpl->residual);
 914
 915                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
 916                         xfer_len -= icmnd_cmpl->residual;
 917
 918                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 919                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 920
 921                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 922                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 923                 break;
 924
 925         case FCPIO_TIMEOUT:          /* request was timed out */
 926                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 927                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 928                 break;
 929
 930         case FCPIO_ABORTED:          /* request was aborted */
 931                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 932                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 933                 break;
 934
 935         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 936                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 937                 scsi_set_resid(sc, icmnd_cmpl->residual);
 938                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 939                 break;
 940
 941         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 942                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 943                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 944                 break;
 945
 946         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 947                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 948                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 949                 break;
 950
 951         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 952                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 953                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 954                 break;
 955
 956         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 957                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 958                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 959                 break;
 960
 961         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 962                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 963                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 964                 break;
 965
 966         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 967         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 968         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 969         default:
 970                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 971                 break;
 972         }
 973
 974         /* Break link with the SCSI command */
 975         CMD_SP(sc) = NULL;
 976         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 977
 978         spin_unlock_irqrestore(io_lock, flags);
 979
 980         if (hdr_status != FCPIO_SUCCESS) {
 981                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 982                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 983                              fnic_fcpio_status_to_str(hdr_status));
 984         }
 985
 986         fnic_release_ioreq_buf(fnic, io_req, sc);
 987
 988         mempool_free(io_req, fnic->io_req_pool);
 989
 990         cmd_trace = ((u64)hdr_status << 56) |
 991                   (u64)icmnd_cmpl->scsi_status << 48 |
 992                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
 993                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
 994                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
 995
 996         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 997                   sc->device->host->host_no, id, sc,
 998                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
 999                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1000                   jiffies_to_msecs(jiffies - start_time)),
1001                   desc, cmd_trace,
1002                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1003
1004         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1005                 fnic->lport->host_stats.fcp_input_requests++;
1006                 fnic->fcp_input_bytes += xfer_len;
1007         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1008                 fnic->lport->host_stats.fcp_output_requests++;
1009                 fnic->fcp_output_bytes += xfer_len;
1010         } else
1011                 fnic->lport->host_stats.fcp_control_requests++;
1012
1013         atomic64_dec(&fnic_stats->io_stats.active_ios);
1014         if (atomic64_read(&fnic->io_cmpl_skip))
1015                 atomic64_dec(&fnic->io_cmpl_skip);
1016         else
1017                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1018
1019         /* Call SCSI completion function to complete the IO */
1020         if (sc->scsi_done)
1021                 sc->scsi_done(sc);
1022 }
1023
1024 /* fnic_fcpio_itmf_cmpl_handler
1025  * Routine to handle itmf completions
1026  */
1027 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1028                                         struct fcpio_fw_req *desc)
1029 {
1030         u8 type;
1031         u8 hdr_status;
1032         struct fcpio_tag tag;
1033         u32 id;
1034         struct scsi_cmnd *sc;
1035         struct fnic_io_req *io_req;
1036         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1037         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1038         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1039         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1040         unsigned long flags;
1041         spinlock_t *io_lock;
1042         unsigned long start_time;
1043
1044         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1045         fcpio_tag_id_dec(&tag, &id);
1046
1047         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1048                 shost_printk(KERN_ERR, fnic->lport->host,
1049                 "Tag out of range tag %x hdr status = %s\n",
1050                 id, fnic_fcpio_status_to_str(hdr_status));
1051                 return;
1052         }
1053
1054         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1055         WARN_ON_ONCE(!sc);
1056         if (!sc) {
1057                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1058                 shost_printk(KERN_ERR, fnic->lport->host,
1059                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1060                           fnic_fcpio_status_to_str(hdr_status), id);
1061                 return;
1062         }
1063         io_lock = fnic_io_lock_hash(fnic, sc);
1064         spin_lock_irqsave(io_lock, flags);
1065         io_req = (struct fnic_io_req *)CMD_SP(sc);
1066         WARN_ON_ONCE(!io_req);
1067         if (!io_req) {
1068                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1069                 spin_unlock_irqrestore(io_lock, flags);
1070                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1071                 shost_printk(KERN_ERR, fnic->lport->host,
1072                           "itmf_cmpl io_req is null - "
1073                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1074                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1075                 return;
1076         }
1077         start_time = io_req->start_time;
1078
1079         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1080                 /* Abort and terminate completion of device reset req */
1081                 /* REVISIT : Add asserts about various flags */
1082                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1083                               "dev reset abts cmpl recd. id %x status %s\n",
1084                               id, fnic_fcpio_status_to_str(hdr_status));
1085                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1086                 CMD_ABTS_STATUS(sc) = hdr_status;
1087                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1088                 if (io_req->abts_done)
1089                         complete(io_req->abts_done);
1090                 spin_unlock_irqrestore(io_lock, flags);
1091         } else if (id & FNIC_TAG_ABORT) {
1092                 /* Completion of abort cmd */
1093                 switch (hdr_status) {
1094                 case FCPIO_SUCCESS:
1095                         break;
1096                 case FCPIO_TIMEOUT:
1097                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1098                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1099                         else
1100                                 atomic64_inc(
1101                                         &term_stats->terminate_fw_timeouts);
1102                         break;
1103                 case FCPIO_ITMF_REJECTED:
1104                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1105                                 "abort reject recd. id %d\n",
1106                                 (int)(id & FNIC_TAG_MASK));
1107                         break;
1108                 case FCPIO_IO_NOT_FOUND:
1109                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1110                                 atomic64_inc(&abts_stats->abort_io_not_found);
1111                         else
1112                                 atomic64_inc(
1113                                         &term_stats->terminate_io_not_found);
1114                         break;
1115                 default:
1116                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1117                                 atomic64_inc(&abts_stats->abort_failures);
1118                         else
1119                                 atomic64_inc(
1120                                         &term_stats->terminate_failures);
1121                         break;
1122                 }
1123                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1124                         /* This is a late completion. Ignore it */
1125                         spin_unlock_irqrestore(io_lock, flags);
1126                         return;
1127                 }
1128
1129                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1130                 CMD_ABTS_STATUS(sc) = hdr_status;
1131
1132                 /* If the status is IO not found consider it as success */
1133                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1134                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1135
1136                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1137                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1138
1139                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1140                               "abts cmpl recd. id %d status %s\n",
1141                               (int)(id & FNIC_TAG_MASK),
1142                               fnic_fcpio_status_to_str(hdr_status));
1143
1144                 /*
1145                  * If scsi_eh thread is blocked waiting for abts to complete,
1146                  * signal completion to it. IO will be cleaned in the thread
1147                  * else clean it in this context
1148                  */
1149                 if (io_req->abts_done) {
1150                         complete(io_req->abts_done);
1151                         spin_unlock_irqrestore(io_lock, flags);
1152                 } else {
1153                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1154                                       "abts cmpl, completing IO\n");
1155                         CMD_SP(sc) = NULL;
1156                         sc->result = (DID_ERROR << 16);
1157
1158                         spin_unlock_irqrestore(io_lock, flags);
1159
1160                         fnic_release_ioreq_buf(fnic, io_req, sc);
1161                         mempool_free(io_req, fnic->io_req_pool);
1162                         if (sc->scsi_done) {
1163                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1164                                         sc->device->host->host_no, id,
1165                                         sc,
1166                                         jiffies_to_msecs(jiffies - start_time),
1167                                         desc,
1168                                         (((u64)hdr_status << 40) |
1169                                         (u64)sc->cmnd[0] << 32 |
1170                                         (u64)sc->cmnd[2] << 24 |
1171                                         (u64)sc->cmnd[3] << 16 |
1172                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1173                                         (((u64)CMD_FLAGS(sc) << 32) |
1174                                         CMD_STATE(sc)));
1175                                 sc->scsi_done(sc);
1176                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1177                                 if (atomic64_read(&fnic->io_cmpl_skip))
1178                                         atomic64_dec(&fnic->io_cmpl_skip);
1179                                 else
1180                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1181                         }
1182                 }
1183
1184         } else if (id & FNIC_TAG_DEV_RST) {
1185                 /* Completion of device reset */
1186                 CMD_LR_STATUS(sc) = hdr_status;
1187                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1188                         spin_unlock_irqrestore(io_lock, flags);
1189                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1190                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1191                                   sc->device->host->host_no, id, sc,
1192                                   jiffies_to_msecs(jiffies - start_time),
1193                                   desc, 0,
1194                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1195                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1196                                 "Terminate pending "
1197                                 "dev reset cmpl recd. id %d status %s\n",
1198                                 (int)(id & FNIC_TAG_MASK),
1199                                 fnic_fcpio_status_to_str(hdr_status));
1200                         return;
1201                 }
1202                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1203                         /* Need to wait for terminate completion */
1204                         spin_unlock_irqrestore(io_lock, flags);
1205                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1206                                   sc->device->host->host_no, id, sc,
1207                                   jiffies_to_msecs(jiffies - start_time),
1208                                   desc, 0,
1209                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1210                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1211                                 "dev reset cmpl recd after time out. "
1212                                 "id %d status %s\n",
1213                                 (int)(id & FNIC_TAG_MASK),
1214                                 fnic_fcpio_status_to_str(hdr_status));
1215                         return;
1216                 }
1217                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1218                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1219                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1220                               "dev reset cmpl recd. id %d status %s\n",
1221                               (int)(id & FNIC_TAG_MASK),
1222                               fnic_fcpio_status_to_str(hdr_status));
1223                 if (io_req->dr_done)
1224                         complete(io_req->dr_done);
1225                 spin_unlock_irqrestore(io_lock, flags);
1226
1227         } else {
1228                 shost_printk(KERN_ERR, fnic->lport->host,
1229                              "Unexpected itmf io state %s tag %x\n",
1230                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1231                 spin_unlock_irqrestore(io_lock, flags);
1232         }
1233
1234 }
1235
1236 /*
1237  * fnic_fcpio_cmpl_handler
1238  * Routine to service the cq for wq_copy
1239  */
1240 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1241                                    unsigned int cq_index,
1242                                    struct fcpio_fw_req *desc)
1243 {
1244         struct fnic *fnic = vnic_dev_priv(vdev);
1245
1246         switch (desc->hdr.type) {
1247         case FCPIO_ICMND_CMPL: /* fw completed a command */
1248         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1249         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1250         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1251         case FCPIO_RESET_CMPL: /* fw completed reset */
1252                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1253                 break;
1254         default:
1255                 break;
1256         }
1257
1258         switch (desc->hdr.type) {
1259         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1260                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1261                 break;
1262
1263         case FCPIO_ICMND_CMPL: /* fw completed a command */
1264                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1265                 break;
1266
1267         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1268                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1269                 break;
1270
1271         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1272         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1273                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1274                 break;
1275
1276         case FCPIO_RESET_CMPL: /* fw completed reset */
1277                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1278                 break;
1279
1280         default:
1281                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1282                               "firmware completion type %d\n",
1283                               desc->hdr.type);
1284                 break;
1285         }
1286
1287         return 0;
1288 }
1289
1290 /*
1291  * fnic_wq_copy_cmpl_handler
1292  * Routine to process wq copy
1293  */
1294 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1295 {
1296         unsigned int wq_work_done = 0;
1297         unsigned int i, cq_index;
1298         unsigned int cur_work_done;
1299
1300         for (i = 0; i < fnic->wq_copy_count; i++) {
1301                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1302                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1303                                                      fnic_fcpio_cmpl_handler,
1304                                                      copy_work_to_do);
1305                 wq_work_done += cur_work_done;
1306         }
1307         return wq_work_done;
1308 }
1309
1310 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1311 {
1312         int i;
1313         struct fnic_io_req *io_req;
1314         unsigned long flags = 0;
1315         struct scsi_cmnd *sc;
1316         spinlock_t *io_lock;
1317         unsigned long start_time = 0;
1318         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1319
1320         for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1321                 if (i == exclude_id)
1322                         continue;
1323
1324                 io_lock = fnic_io_lock_tag(fnic, i);
1325                 spin_lock_irqsave(io_lock, flags);
1326                 sc = scsi_host_find_tag(fnic->lport->host, i);
1327                 if (!sc) {
1328                         spin_unlock_irqrestore(io_lock, flags);
1329                         continue;
1330                 }
1331
1332                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1333                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1334                         !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1335                         /*
1336                          * We will be here only when FW completes reset
1337                          * without sending completions for outstanding ios.
1338                          */
1339                         CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1340                         if (io_req && io_req->dr_done)
1341                                 complete(io_req->dr_done);
1342                         else if (io_req && io_req->abts_done)
1343                                 complete(io_req->abts_done);
1344                         spin_unlock_irqrestore(io_lock, flags);
1345                         continue;
1346                 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1347                         spin_unlock_irqrestore(io_lock, flags);
1348                         continue;
1349                 }
1350                 if (!io_req) {
1351                         spin_unlock_irqrestore(io_lock, flags);
1352                         goto cleanup_scsi_cmd;
1353                 }
1354
1355                 CMD_SP(sc) = NULL;
1356
1357                 spin_unlock_irqrestore(io_lock, flags);
1358
1359                 /*
1360                  * If there is a scsi_cmnd associated with this io_req, then
1361                  * free the corresponding state
1362                  */
1363                 start_time = io_req->start_time;
1364                 fnic_release_ioreq_buf(fnic, io_req, sc);
1365                 mempool_free(io_req, fnic->io_req_pool);
1366
1367 cleanup_scsi_cmd:
1368                 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1369                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1370                               "%s: sc duration = %lu DID_TRANSPORT_DISRUPTED\n",
1371                               __func__, (jiffies - start_time));
1372
1373                 if (atomic64_read(&fnic->io_cmpl_skip))
1374                         atomic64_dec(&fnic->io_cmpl_skip);
1375                 else
1376                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1377
1378                 /* Complete the command to SCSI */
1379                 if (sc->scsi_done) {
1380                         FNIC_TRACE(fnic_cleanup_io,
1381                                   sc->device->host->host_no, i, sc,
1382                                   jiffies_to_msecs(jiffies - start_time),
1383                                   0, ((u64)sc->cmnd[0] << 32 |
1384                                   (u64)sc->cmnd[2] << 24 |
1385                                   (u64)sc->cmnd[3] << 16 |
1386                                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1387                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1388
1389                         sc->scsi_done(sc);
1390                 }
1391         }
1392 }
1393
1394 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1395                                   struct fcpio_host_req *desc)
1396 {
1397         u32 id;
1398         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1399         struct fnic_io_req *io_req;
1400         struct scsi_cmnd *sc;
1401         unsigned long flags;
1402         spinlock_t *io_lock;
1403         unsigned long start_time = 0;
1404
1405         /* get the tag reference */
1406         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1407         id &= FNIC_TAG_MASK;
1408
1409         if (id >= fnic->fnic_max_tag_id)
1410                 return;
1411
1412         sc = scsi_host_find_tag(fnic->lport->host, id);
1413         if (!sc)
1414                 return;
1415
1416         io_lock = fnic_io_lock_hash(fnic, sc);
1417         spin_lock_irqsave(io_lock, flags);
1418
1419         /* Get the IO context which this desc refers to */
1420         io_req = (struct fnic_io_req *)CMD_SP(sc);
1421
1422         /* fnic interrupts are turned off by now */
1423
1424         if (!io_req) {
1425                 spin_unlock_irqrestore(io_lock, flags);
1426                 goto wq_copy_cleanup_scsi_cmd;
1427         }
1428
1429         CMD_SP(sc) = NULL;
1430
1431         spin_unlock_irqrestore(io_lock, flags);
1432
1433         start_time = io_req->start_time;
1434         fnic_release_ioreq_buf(fnic, io_req, sc);
1435         mempool_free(io_req, fnic->io_req_pool);
1436
1437 wq_copy_cleanup_scsi_cmd:
1438         sc->result = DID_NO_CONNECT << 16;
1439         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1440                       " DID_NO_CONNECT\n");
1441
1442         if (sc->scsi_done) {
1443                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1444                           sc->device->host->host_no, id, sc,
1445                           jiffies_to_msecs(jiffies - start_time),
1446                           0, ((u64)sc->cmnd[0] << 32 |
1447                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1448                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1449                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1450
1451                 sc->scsi_done(sc);
1452         }
1453 }
1454
1455 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1456                                           u32 task_req, u8 *fc_lun,
1457                                           struct fnic_io_req *io_req)
1458 {
1459         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1460         struct Scsi_Host *host = fnic->lport->host;
1461         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1462         unsigned long flags;
1463
1464         spin_lock_irqsave(host->host_lock, flags);
1465         if (unlikely(fnic_chk_state_flags_locked(fnic,
1466                                                 FNIC_FLAGS_IO_BLOCKED))) {
1467                 spin_unlock_irqrestore(host->host_lock, flags);
1468                 return 1;
1469         } else
1470                 atomic_inc(&fnic->in_flight);
1471         spin_unlock_irqrestore(host->host_lock, flags);
1472
1473         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1474
1475         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1476                 free_wq_copy_descs(fnic, wq);
1477
1478         if (!vnic_wq_copy_desc_avail(wq)) {
1479                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1480                 atomic_dec(&fnic->in_flight);
1481                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1482                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1483                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1484                 return 1;
1485         }
1486         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1487                                      0, task_req, tag, fc_lun, io_req->port_id,
1488                                      fnic->config.ra_tov, fnic->config.ed_tov);
1489
1490         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1491         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1492                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1493                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1494                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1495
1496         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1497         atomic_dec(&fnic->in_flight);
1498
1499         return 0;
1500 }
1501
1502 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1503 {
1504         int tag;
1505         int abt_tag;
1506         int term_cnt = 0;
1507         struct fnic_io_req *io_req;
1508         spinlock_t *io_lock;
1509         unsigned long flags;
1510         struct scsi_cmnd *sc;
1511         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1512         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1513         struct scsi_lun fc_lun;
1514         enum fnic_ioreq_state old_ioreq_state;
1515
1516         FNIC_SCSI_DBG(KERN_DEBUG,
1517                       fnic->lport->host,
1518                       "fnic_rport_exch_reset called portid 0x%06x\n",
1519                       port_id);
1520
1521         if (fnic->in_remove)
1522                 return;
1523
1524         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1525                 abt_tag = tag;
1526                 io_lock = fnic_io_lock_tag(fnic, tag);
1527                 spin_lock_irqsave(io_lock, flags);
1528                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1529                 if (!sc) {
1530                         spin_unlock_irqrestore(io_lock, flags);
1531                         continue;
1532                 }
1533
1534                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1535
1536                 if (!io_req || io_req->port_id != port_id) {
1537                         spin_unlock_irqrestore(io_lock, flags);
1538                         continue;
1539                 }
1540
1541                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1542                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1543                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1544                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1545                         sc);
1546                         spin_unlock_irqrestore(io_lock, flags);
1547                         continue;
1548                 }
1549
1550                 /*
1551                  * Found IO that is still pending with firmware and
1552                  * belongs to rport that went away
1553                  */
1554                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1555                         spin_unlock_irqrestore(io_lock, flags);
1556                         continue;
1557                 }
1558                 if (io_req->abts_done) {
1559                         shost_printk(KERN_ERR, fnic->lport->host,
1560                         "fnic_rport_exch_reset: io_req->abts_done is set "
1561                         "state is %s\n",
1562                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1563                 }
1564
1565                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1566                         shost_printk(KERN_ERR, fnic->lport->host,
1567                                   "rport_exch_reset "
1568                                   "IO not yet issued %p tag 0x%x flags "
1569                                   "%x state %d\n",
1570                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1571                 }
1572                 old_ioreq_state = CMD_STATE(sc);
1573                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1574                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1575                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1576                         atomic64_inc(&reset_stats->device_reset_terminates);
1577                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1578                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1579                         "fnic_rport_exch_reset dev rst sc 0x%p\n",
1580                         sc);
1581                 }
1582
1583                 BUG_ON(io_req->abts_done);
1584
1585                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1586                               "fnic_rport_reset_exch: Issuing abts\n");
1587
1588                 spin_unlock_irqrestore(io_lock, flags);
1589
1590                 /* Now queue the abort command to firmware */
1591                 int_to_scsilun(sc->device->lun, &fc_lun);
1592
1593                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1594                                             FCPIO_ITMF_ABT_TASK_TERM,
1595                                             fc_lun.scsi_lun, io_req)) {
1596                         /*
1597                          * Revert the cmd state back to old state, if
1598                          * it hasn't changed in between. This cmd will get
1599                          * aborted later by scsi_eh, or cleaned up during
1600                          * lun reset
1601                          */
1602                         spin_lock_irqsave(io_lock, flags);
1603                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1604                                 CMD_STATE(sc) = old_ioreq_state;
1605                         spin_unlock_irqrestore(io_lock, flags);
1606                 } else {
1607                         spin_lock_irqsave(io_lock, flags);
1608                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1609                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1610                         else
1611                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1612                         spin_unlock_irqrestore(io_lock, flags);
1613                         atomic64_inc(&term_stats->terminates);
1614                         term_cnt++;
1615                 }
1616         }
1617         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1618                 atomic64_set(&term_stats->max_terminates, term_cnt);
1619
1620 }
1621
1622 void fnic_terminate_rport_io(struct fc_rport *rport)
1623 {
1624         int tag;
1625         int abt_tag;
1626         int term_cnt = 0;
1627         struct fnic_io_req *io_req;
1628         spinlock_t *io_lock;
1629         unsigned long flags;
1630         struct scsi_cmnd *sc;
1631         struct scsi_lun fc_lun;
1632         struct fc_rport_libfc_priv *rdata;
1633         struct fc_lport *lport;
1634         struct fnic *fnic;
1635         struct fc_rport *cmd_rport;
1636         struct reset_stats *reset_stats;
1637         struct terminate_stats *term_stats;
1638         enum fnic_ioreq_state old_ioreq_state;
1639
1640         if (!rport) {
1641                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1642                 return;
1643         }
1644         rdata = rport->dd_data;
1645
1646         if (!rdata) {
1647                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1648                 return;
1649         }
1650         lport = rdata->local_port;
1651
1652         if (!lport) {
1653                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1654                 return;
1655         }
1656         fnic = lport_priv(lport);
1657         FNIC_SCSI_DBG(KERN_DEBUG,
1658                       fnic->lport->host, "fnic_terminate_rport_io called"
1659                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1660                       rport->port_name, rport->node_name, rport,
1661                       rport->port_id);
1662
1663         if (fnic->in_remove)
1664                 return;
1665
1666         reset_stats = &fnic->fnic_stats.reset_stats;
1667         term_stats = &fnic->fnic_stats.term_stats;
1668
1669         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1670                 abt_tag = tag;
1671                 io_lock = fnic_io_lock_tag(fnic, tag);
1672                 spin_lock_irqsave(io_lock, flags);
1673                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1674                 if (!sc) {
1675                         spin_unlock_irqrestore(io_lock, flags);
1676                         continue;
1677                 }
1678
1679                 cmd_rport = starget_to_rport(scsi_target(sc->device));
1680                 if (rport != cmd_rport) {
1681                         spin_unlock_irqrestore(io_lock, flags);
1682                         continue;
1683                 }
1684
1685                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1686
1687                 if (!io_req || rport != cmd_rport) {
1688                         spin_unlock_irqrestore(io_lock, flags);
1689                         continue;
1690                 }
1691
1692                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1693                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1694                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1695                         "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1696                         sc);
1697                         spin_unlock_irqrestore(io_lock, flags);
1698                         continue;
1699                 }
1700                 /*
1701                  * Found IO that is still pending with firmware and
1702                  * belongs to rport that went away
1703                  */
1704                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1705                         spin_unlock_irqrestore(io_lock, flags);
1706                         continue;
1707                 }
1708                 if (io_req->abts_done) {
1709                         shost_printk(KERN_ERR, fnic->lport->host,
1710                         "fnic_terminate_rport_io: io_req->abts_done is set "
1711                         "state is %s\n",
1712                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1713                 }
1714                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1715                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1716                                   "fnic_terminate_rport_io "
1717                                   "IO not yet issued %p tag 0x%x flags "
1718                                   "%x state %d\n",
1719                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1720                 }
1721                 old_ioreq_state = CMD_STATE(sc);
1722                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1723                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1724                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1725                         atomic64_inc(&reset_stats->device_reset_terminates);
1726                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1727                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1728                         "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1729                 }
1730
1731                 BUG_ON(io_req->abts_done);
1732
1733                 FNIC_SCSI_DBG(KERN_DEBUG,
1734                               fnic->lport->host,
1735                               "fnic_terminate_rport_io: Issuing abts\n");
1736
1737                 spin_unlock_irqrestore(io_lock, flags);
1738
1739                 /* Now queue the abort command to firmware */
1740                 int_to_scsilun(sc->device->lun, &fc_lun);
1741
1742                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1743                                             FCPIO_ITMF_ABT_TASK_TERM,
1744                                             fc_lun.scsi_lun, io_req)) {
1745                         /*
1746                          * Revert the cmd state back to old state, if
1747                          * it hasn't changed in between. This cmd will get
1748                          * aborted later by scsi_eh, or cleaned up during
1749                          * lun reset
1750                          */
1751                         spin_lock_irqsave(io_lock, flags);
1752                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1753                                 CMD_STATE(sc) = old_ioreq_state;
1754                         spin_unlock_irqrestore(io_lock, flags);
1755                 } else {
1756                         spin_lock_irqsave(io_lock, flags);
1757                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1758                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1759                         else
1760                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1761                         spin_unlock_irqrestore(io_lock, flags);
1762                         atomic64_inc(&term_stats->terminates);
1763                         term_cnt++;
1764                 }
1765         }
1766         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1767                 atomic64_set(&term_stats->max_terminates, term_cnt);
1768
1769 }
1770
1771 /*
1772  * This function is exported to SCSI for sending abort cmnds.
1773  * A SCSI IO is represented by a io_req in the driver.
1774  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1775  */
1776 int fnic_abort_cmd(struct scsi_cmnd *sc)
1777 {
1778         struct fc_lport *lp;
1779         struct fnic *fnic;
1780         struct fnic_io_req *io_req = NULL;
1781         struct fc_rport *rport;
1782         spinlock_t *io_lock;
1783         unsigned long flags;
1784         unsigned long start_time = 0;
1785         int ret = SUCCESS;
1786         u32 task_req = 0;
1787         struct scsi_lun fc_lun;
1788         struct fnic_stats *fnic_stats;
1789         struct abort_stats *abts_stats;
1790         struct terminate_stats *term_stats;
1791         enum fnic_ioreq_state old_ioreq_state;
1792         int tag;
1793         DECLARE_COMPLETION_ONSTACK(tm_done);
1794
1795         /* Wait for rport to unblock */
1796         fc_block_scsi_eh(sc);
1797
1798         /* Get local-port, check ready and link up */
1799         lp = shost_priv(sc->device->host);
1800
1801         fnic = lport_priv(lp);
1802         fnic_stats = &fnic->fnic_stats;
1803         abts_stats = &fnic->fnic_stats.abts_stats;
1804         term_stats = &fnic->fnic_stats.term_stats;
1805
1806         rport = starget_to_rport(scsi_target(sc->device));
1807         tag = sc->request->tag;
1808         FNIC_SCSI_DBG(KERN_DEBUG,
1809                 fnic->lport->host,
1810                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1811                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1812
1813         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1814
1815         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1816                 ret = FAILED;
1817                 goto fnic_abort_cmd_end;
1818         }
1819
1820         /*
1821          * Avoid a race between SCSI issuing the abort and the device
1822          * completing the command.
1823          *
1824          * If the command is already completed by the fw cmpl code,
1825          * we just return SUCCESS from here. This means that the abort
1826          * succeeded. In the SCSI ML, since the timeout for command has
1827          * happened, the completion wont actually complete the command
1828          * and it will be considered as an aborted command
1829          *
1830          * The CMD_SP will not be cleared except while holding io_req_lock.
1831          */
1832         io_lock = fnic_io_lock_hash(fnic, sc);
1833         spin_lock_irqsave(io_lock, flags);
1834         io_req = (struct fnic_io_req *)CMD_SP(sc);
1835         if (!io_req) {
1836                 spin_unlock_irqrestore(io_lock, flags);
1837                 goto fnic_abort_cmd_end;
1838         }
1839
1840         io_req->abts_done = &tm_done;
1841
1842         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1843                 spin_unlock_irqrestore(io_lock, flags);
1844                 goto wait_pending;
1845         }
1846         /*
1847          * Command is still pending, need to abort it
1848          * If the firmware completes the command after this point,
1849          * the completion wont be done till mid-layer, since abort
1850          * has already started.
1851          */
1852         old_ioreq_state = CMD_STATE(sc);
1853         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1854         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1855
1856         spin_unlock_irqrestore(io_lock, flags);
1857
1858         /*
1859          * Check readiness of the remote port. If the path to remote
1860          * port is up, then send abts to the remote port to terminate
1861          * the IO. Else, just locally terminate the IO in the firmware
1862          */
1863         if (fc_remote_port_chkready(rport) == 0)
1864                 task_req = FCPIO_ITMF_ABT_TASK;
1865         else {
1866                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1867                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1868         }
1869
1870         /* Now queue the abort command to firmware */
1871         int_to_scsilun(sc->device->lun, &fc_lun);
1872
1873         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1874                                     fc_lun.scsi_lun, io_req)) {
1875                 spin_lock_irqsave(io_lock, flags);
1876                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1877                         CMD_STATE(sc) = old_ioreq_state;
1878                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1879                 if (io_req)
1880                         io_req->abts_done = NULL;
1881                 spin_unlock_irqrestore(io_lock, flags);
1882                 ret = FAILED;
1883                 goto fnic_abort_cmd_end;
1884         }
1885         if (task_req == FCPIO_ITMF_ABT_TASK) {
1886                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1887                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1888         } else {
1889                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1890                 atomic64_inc(&fnic_stats->term_stats.terminates);
1891         }
1892
1893         /*
1894          * We queued an abort IO, wait for its completion.
1895          * Once the firmware completes the abort command, it will
1896          * wake up this thread.
1897          */
1898  wait_pending:
1899         wait_for_completion_timeout(&tm_done,
1900                                     msecs_to_jiffies
1901                                     (2 * fnic->config.ra_tov +
1902                                      fnic->config.ed_tov));
1903
1904         /* Check the abort status */
1905         spin_lock_irqsave(io_lock, flags);
1906
1907         io_req = (struct fnic_io_req *)CMD_SP(sc);
1908         if (!io_req) {
1909                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1910                 spin_unlock_irqrestore(io_lock, flags);
1911                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1912                 ret = FAILED;
1913                 goto fnic_abort_cmd_end;
1914         }
1915         io_req->abts_done = NULL;
1916
1917         /* fw did not complete abort, timed out */
1918         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1919                 spin_unlock_irqrestore(io_lock, flags);
1920                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1921                         atomic64_inc(&abts_stats->abort_drv_timeouts);
1922                 } else {
1923                         atomic64_inc(&term_stats->terminate_drv_timeouts);
1924                 }
1925                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
1926                 ret = FAILED;
1927                 goto fnic_abort_cmd_end;
1928         }
1929
1930         /* IO out of order */
1931
1932         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
1933                 spin_unlock_irqrestore(io_lock, flags);
1934                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1935                         "Issuing Host reset due to out of order IO\n");
1936
1937                 if (fnic_host_reset(sc) == FAILED) {
1938                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1939                                 "fnic_host_reset failed.\n");
1940                 }
1941                 ret = FAILED;
1942                 goto fnic_abort_cmd_end;
1943         }
1944
1945         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1946
1947         start_time = io_req->start_time;
1948         /*
1949          * firmware completed the abort, check the status,
1950          * free the io_req if successful. If abort fails,
1951          * Device reset will clean the I/O.
1952          */
1953         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
1954                 CMD_SP(sc) = NULL;
1955         else {
1956                 ret = FAILED;
1957                 spin_unlock_irqrestore(io_lock, flags);
1958                 goto fnic_abort_cmd_end;
1959         }
1960
1961         spin_unlock_irqrestore(io_lock, flags);
1962
1963         fnic_release_ioreq_buf(fnic, io_req, sc);
1964         mempool_free(io_req, fnic->io_req_pool);
1965
1966         if (sc->scsi_done) {
1967         /* Call SCSI completion function to complete the IO */
1968                 sc->result = (DID_ABORT << 16);
1969                 sc->scsi_done(sc);
1970                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1971                 if (atomic64_read(&fnic->io_cmpl_skip))
1972                         atomic64_dec(&fnic->io_cmpl_skip);
1973                 else
1974                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1975         }
1976
1977 fnic_abort_cmd_end:
1978         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
1979                   sc->request->tag, sc,
1980                   jiffies_to_msecs(jiffies - start_time),
1981                   0, ((u64)sc->cmnd[0] << 32 |
1982                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1983                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1984                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1985
1986         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1987                       "Returning from abort cmd type %x %s\n", task_req,
1988                       (ret == SUCCESS) ?
1989                       "SUCCESS" : "FAILED");
1990         return ret;
1991 }
1992
1993 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
1994                                        struct scsi_cmnd *sc,
1995                                        struct fnic_io_req *io_req)
1996 {
1997         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1998         struct Scsi_Host *host = fnic->lport->host;
1999         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
2000         struct scsi_lun fc_lun;
2001         int ret = 0;
2002         unsigned long intr_flags;
2003
2004         spin_lock_irqsave(host->host_lock, intr_flags);
2005         if (unlikely(fnic_chk_state_flags_locked(fnic,
2006                                                 FNIC_FLAGS_IO_BLOCKED))) {
2007                 spin_unlock_irqrestore(host->host_lock, intr_flags);
2008                 return FAILED;
2009         } else
2010                 atomic_inc(&fnic->in_flight);
2011         spin_unlock_irqrestore(host->host_lock, intr_flags);
2012
2013         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2014
2015         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2016                 free_wq_copy_descs(fnic, wq);
2017
2018         if (!vnic_wq_copy_desc_avail(wq)) {
2019                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2020                           "queue_dr_io_req failure - no descriptors\n");
2021                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2022                 ret = -EAGAIN;
2023                 goto lr_io_req_end;
2024         }
2025
2026         /* fill in the lun info */
2027         int_to_scsilun(sc->device->lun, &fc_lun);
2028
2029         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2030                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2031                                      fc_lun.scsi_lun, io_req->port_id,
2032                                      fnic->config.ra_tov, fnic->config.ed_tov);
2033
2034         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2035         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2036                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2037                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2038                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2039
2040 lr_io_req_end:
2041         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2042         atomic_dec(&fnic->in_flight);
2043
2044         return ret;
2045 }
2046
2047 /*
2048  * Clean up any pending aborts on the lun
2049  * For each outstanding IO on this lun, whose abort is not completed by fw,
2050  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2051  * successfully aborted, 1 otherwise
2052  */
2053 static int fnic_clean_pending_aborts(struct fnic *fnic,
2054                                      struct scsi_cmnd *lr_sc,
2055                                          bool new_sc)
2056
2057 {
2058         int tag, abt_tag;
2059         struct fnic_io_req *io_req;
2060         spinlock_t *io_lock;
2061         unsigned long flags;
2062         int ret = 0;
2063         struct scsi_cmnd *sc;
2064         struct scsi_lun fc_lun;
2065         struct scsi_device *lun_dev = lr_sc->device;
2066         DECLARE_COMPLETION_ONSTACK(tm_done);
2067         enum fnic_ioreq_state old_ioreq_state;
2068
2069         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2070                 io_lock = fnic_io_lock_tag(fnic, tag);
2071                 spin_lock_irqsave(io_lock, flags);
2072                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2073                 /*
2074                  * ignore this lun reset cmd if issued using new SC
2075                  * or cmds that do not belong to this lun
2076                  */
2077                 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2078                         spin_unlock_irqrestore(io_lock, flags);
2079                         continue;
2080                 }
2081
2082                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2083
2084                 if (!io_req || sc->device != lun_dev) {
2085                         spin_unlock_irqrestore(io_lock, flags);
2086                         continue;
2087                 }
2088
2089                 /*
2090                  * Found IO that is still pending with firmware and
2091                  * belongs to the LUN that we are resetting
2092                  */
2093                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2094                               "Found IO in %s on lun\n",
2095                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2096
2097                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2098                         spin_unlock_irqrestore(io_lock, flags);
2099                         continue;
2100                 }
2101                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2102                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2103                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2104                                 "%s dev rst not pending sc 0x%p\n", __func__,
2105                                 sc);
2106                         spin_unlock_irqrestore(io_lock, flags);
2107                         continue;
2108                 }
2109
2110                 if (io_req->abts_done)
2111                         shost_printk(KERN_ERR, fnic->lport->host,
2112                           "%s: io_req->abts_done is set state is %s\n",
2113                           __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2114                 old_ioreq_state = CMD_STATE(sc);
2115                 /*
2116                  * Any pending IO issued prior to reset is expected to be
2117                  * in abts pending state, if not we need to set
2118                  * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2119                  * When IO is completed, the IO will be handed over and
2120                  * handled in this function.
2121                  */
2122                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2123
2124                 BUG_ON(io_req->abts_done);
2125
2126                 abt_tag = tag;
2127                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2128                         abt_tag |= FNIC_TAG_DEV_RST;
2129                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2130                                   "%s: dev rst sc 0x%p\n", __func__, sc);
2131                 }
2132
2133                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2134                 io_req->abts_done = &tm_done;
2135                 spin_unlock_irqrestore(io_lock, flags);
2136
2137                 /* Now queue the abort command to firmware */
2138                 int_to_scsilun(sc->device->lun, &fc_lun);
2139
2140                 if (fnic_queue_abort_io_req(fnic, abt_tag,
2141                                             FCPIO_ITMF_ABT_TASK_TERM,
2142                                             fc_lun.scsi_lun, io_req)) {
2143                         spin_lock_irqsave(io_lock, flags);
2144                         io_req = (struct fnic_io_req *)CMD_SP(sc);
2145                         if (io_req)
2146                                 io_req->abts_done = NULL;
2147                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2148                                 CMD_STATE(sc) = old_ioreq_state;
2149                         spin_unlock_irqrestore(io_lock, flags);
2150                         ret = 1;
2151                         goto clean_pending_aborts_end;
2152                 } else {
2153                         spin_lock_irqsave(io_lock, flags);
2154                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2155                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2156                         spin_unlock_irqrestore(io_lock, flags);
2157                 }
2158                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2159
2160                 wait_for_completion_timeout(&tm_done,
2161                                             msecs_to_jiffies
2162                                             (fnic->config.ed_tov));
2163
2164                 /* Recheck cmd state to check if it is now aborted */
2165                 spin_lock_irqsave(io_lock, flags);
2166                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2167                 if (!io_req) {
2168                         spin_unlock_irqrestore(io_lock, flags);
2169                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2170                         continue;
2171                 }
2172
2173                 io_req->abts_done = NULL;
2174
2175                 /* if abort is still pending with fw, fail */
2176                 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2177                         spin_unlock_irqrestore(io_lock, flags);
2178                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2179                         ret = 1;
2180                         goto clean_pending_aborts_end;
2181                 }
2182                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2183
2184                 /* original sc used for lr is handled by dev reset code */
2185                 if (sc != lr_sc)
2186                         CMD_SP(sc) = NULL;
2187                 spin_unlock_irqrestore(io_lock, flags);
2188
2189                 /* original sc used for lr is handled by dev reset code */
2190                 if (sc != lr_sc) {
2191                         fnic_release_ioreq_buf(fnic, io_req, sc);
2192                         mempool_free(io_req, fnic->io_req_pool);
2193                 }
2194
2195                 /*
2196                  * Any IO is returned during reset, it needs to call scsi_done
2197                  * to return the scsi_cmnd to upper layer.
2198                  */
2199                 if (sc->scsi_done) {
2200                         /* Set result to let upper SCSI layer retry */
2201                         sc->result = DID_RESET << 16;
2202                         sc->scsi_done(sc);
2203                 }
2204         }
2205
2206         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2207
2208         /* walk again to check, if IOs are still pending in fw */
2209         if (fnic_is_abts_pending(fnic, lr_sc))
2210                 ret = FAILED;
2211
2212 clean_pending_aborts_end:
2213         return ret;
2214 }
2215
2216 /**
2217  * fnic_scsi_host_start_tag
2218  * Allocates tagid from host's tag list
2219  **/
2220 static inline int
2221 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2222 {
2223         struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2224         int tag, ret = SCSI_NO_TAG;
2225
2226         BUG_ON(!bqt);
2227         if (!bqt) {
2228                 pr_err("Tags are not supported\n");
2229                 goto end;
2230         }
2231
2232         do {
2233                 tag = find_next_zero_bit(bqt->tag_map, bqt->max_depth, 1);
2234                 if (tag >= bqt->max_depth) {
2235                         pr_err("Tag allocation failure\n");
2236                         goto end;
2237                 }
2238         } while (test_and_set_bit(tag, bqt->tag_map));
2239
2240         bqt->tag_index[tag] = sc->request;
2241         sc->request->tag = tag;
2242         sc->tag = tag;
2243         if (!sc->request->special)
2244                 sc->request->special = sc;
2245
2246         ret = tag;
2247
2248 end:
2249         return ret;
2250 }
2251
2252 /**
2253  * fnic_scsi_host_end_tag
2254  * frees tag allocated by fnic_scsi_host_start_tag.
2255  **/
2256 static inline void
2257 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2258 {
2259         struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2260         int tag = sc->request->tag;
2261
2262         if (tag == SCSI_NO_TAG)
2263                 return;
2264
2265         BUG_ON(!bqt || !bqt->tag_index[tag]);
2266         if (!bqt)
2267                 return;
2268
2269         bqt->tag_index[tag] = NULL;
2270         clear_bit(tag, bqt->tag_map);
2271
2272         return;
2273 }
2274
2275 /*
2276  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2277  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2278  * on the LUN.
2279  */
2280 int fnic_device_reset(struct scsi_cmnd *sc)
2281 {
2282         struct fc_lport *lp;
2283         struct fnic *fnic;
2284         struct fnic_io_req *io_req = NULL;
2285         struct fc_rport *rport;
2286         int status;
2287         int ret = FAILED;
2288         spinlock_t *io_lock;
2289         unsigned long flags;
2290         unsigned long start_time = 0;
2291         struct scsi_lun fc_lun;
2292         struct fnic_stats *fnic_stats;
2293         struct reset_stats *reset_stats;
2294         int tag = 0;
2295         DECLARE_COMPLETION_ONSTACK(tm_done);
2296         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2297         bool new_sc = 0;
2298
2299         /* Wait for rport to unblock */
2300         fc_block_scsi_eh(sc);
2301
2302         /* Get local-port, check ready and link up */
2303         lp = shost_priv(sc->device->host);
2304
2305         fnic = lport_priv(lp);
2306         fnic_stats = &fnic->fnic_stats;
2307         reset_stats = &fnic->fnic_stats.reset_stats;
2308
2309         atomic64_inc(&reset_stats->device_resets);
2310
2311         rport = starget_to_rport(scsi_target(sc->device));
2312         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2313                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2314                       rport->port_id, sc->device->lun, sc);
2315
2316         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2317                 goto fnic_device_reset_end;
2318
2319         /* Check if remote port up */
2320         if (fc_remote_port_chkready(rport)) {
2321                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2322                 goto fnic_device_reset_end;
2323         }
2324
2325         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2326         /* Allocate tag if not present */
2327
2328         tag = sc->request->tag;
2329         if (unlikely(tag < 0)) {
2330                 /*
2331                  * XXX(hch): current the midlayer fakes up a struct
2332                  * request for the explicit reset ioctls, and those
2333                  * don't have a tag allocated to them.  The below
2334                  * code pokes into midlayer structures to paper over
2335                  * this design issue, but that won't work for blk-mq.
2336                  *
2337                  * Either someone who can actually test the hardware
2338                  * will have to come up with a similar hack for the
2339                  * blk-mq case, or we'll have to bite the bullet and
2340                  * fix the way the EH ioctls work for real, but until
2341                  * that happens we fail these explicit requests here.
2342                  */
2343
2344                 tag = fnic_scsi_host_start_tag(fnic, sc);
2345                 if (unlikely(tag == SCSI_NO_TAG))
2346                         goto fnic_device_reset_end;
2347                 tag_gen_flag = 1;
2348                 new_sc = 1;
2349         }
2350         io_lock = fnic_io_lock_hash(fnic, sc);
2351         spin_lock_irqsave(io_lock, flags);
2352         io_req = (struct fnic_io_req *)CMD_SP(sc);
2353
2354         /*
2355          * If there is a io_req attached to this command, then use it,
2356          * else allocate a new one.
2357          */
2358         if (!io_req) {
2359                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2360                 if (!io_req) {
2361                         spin_unlock_irqrestore(io_lock, flags);
2362                         goto fnic_device_reset_end;
2363                 }
2364                 memset(io_req, 0, sizeof(*io_req));
2365                 io_req->port_id = rport->port_id;
2366                 CMD_SP(sc) = (char *)io_req;
2367         }
2368         io_req->dr_done = &tm_done;
2369         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2370         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2371         spin_unlock_irqrestore(io_lock, flags);
2372
2373         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2374
2375         /*
2376          * issue the device reset, if enqueue failed, clean up the ioreq
2377          * and break assoc with scsi cmd
2378          */
2379         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2380                 spin_lock_irqsave(io_lock, flags);
2381                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2382                 if (io_req)
2383                         io_req->dr_done = NULL;
2384                 goto fnic_device_reset_clean;
2385         }
2386         spin_lock_irqsave(io_lock, flags);
2387         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2388         spin_unlock_irqrestore(io_lock, flags);
2389
2390         /*
2391          * Wait on the local completion for LUN reset.  The io_req may be
2392          * freed while we wait since we hold no lock.
2393          */
2394         wait_for_completion_timeout(&tm_done,
2395                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2396
2397         spin_lock_irqsave(io_lock, flags);
2398         io_req = (struct fnic_io_req *)CMD_SP(sc);
2399         if (!io_req) {
2400                 spin_unlock_irqrestore(io_lock, flags);
2401                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2402                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2403                 goto fnic_device_reset_end;
2404         }
2405         io_req->dr_done = NULL;
2406
2407         status = CMD_LR_STATUS(sc);
2408
2409         /*
2410          * If lun reset not completed, bail out with failed. io_req
2411          * gets cleaned up during higher levels of EH
2412          */
2413         if (status == FCPIO_INVALID_CODE) {
2414                 atomic64_inc(&reset_stats->device_reset_timeouts);
2415                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2416                               "Device reset timed out\n");
2417                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2418                 spin_unlock_irqrestore(io_lock, flags);
2419                 int_to_scsilun(sc->device->lun, &fc_lun);
2420                 /*
2421                  * Issue abort and terminate on device reset request.
2422                  * If q'ing of terminate fails, retry it after a delay.
2423                  */
2424                 while (1) {
2425                         spin_lock_irqsave(io_lock, flags);
2426                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2427                                 spin_unlock_irqrestore(io_lock, flags);
2428                                 break;
2429                         }
2430                         spin_unlock_irqrestore(io_lock, flags);
2431                         if (fnic_queue_abort_io_req(fnic,
2432                                 tag | FNIC_TAG_DEV_RST,
2433                                 FCPIO_ITMF_ABT_TASK_TERM,
2434                                 fc_lun.scsi_lun, io_req)) {
2435                                 wait_for_completion_timeout(&tm_done,
2436                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2437                         } else {
2438                                 spin_lock_irqsave(io_lock, flags);
2439                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2440                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2441                                 io_req->abts_done = &tm_done;
2442                                 spin_unlock_irqrestore(io_lock, flags);
2443                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2444                                 "Abort and terminate issued on Device reset "
2445                                 "tag 0x%x sc 0x%p\n", tag, sc);
2446                                 break;
2447                         }
2448                 }
2449                 while (1) {
2450                         spin_lock_irqsave(io_lock, flags);
2451                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2452                                 spin_unlock_irqrestore(io_lock, flags);
2453                                 wait_for_completion_timeout(&tm_done,
2454                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2455                                 break;
2456                         } else {
2457                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2458                                 io_req->abts_done = NULL;
2459                                 goto fnic_device_reset_clean;
2460                         }
2461                 }
2462         } else {
2463                 spin_unlock_irqrestore(io_lock, flags);
2464         }
2465
2466         /* Completed, but not successful, clean up the io_req, return fail */
2467         if (status != FCPIO_SUCCESS) {
2468                 spin_lock_irqsave(io_lock, flags);
2469                 FNIC_SCSI_DBG(KERN_DEBUG,
2470                               fnic->lport->host,
2471                               "Device reset completed - failed\n");
2472                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2473                 goto fnic_device_reset_clean;
2474         }
2475
2476         /*
2477          * Clean up any aborts on this lun that have still not
2478          * completed. If any of these fail, then LUN reset fails.
2479          * clean_pending_aborts cleans all cmds on this lun except
2480          * the lun reset cmd. If all cmds get cleaned, the lun reset
2481          * succeeds
2482          */
2483         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2484                 spin_lock_irqsave(io_lock, flags);
2485                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2486                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2487                               "Device reset failed"
2488                               " since could not abort all IOs\n");
2489                 goto fnic_device_reset_clean;
2490         }
2491
2492         /* Clean lun reset command */
2493         spin_lock_irqsave(io_lock, flags);
2494         io_req = (struct fnic_io_req *)CMD_SP(sc);
2495         if (io_req)
2496                 /* Completed, and successful */
2497                 ret = SUCCESS;
2498
2499 fnic_device_reset_clean:
2500         if (io_req)
2501                 CMD_SP(sc) = NULL;
2502
2503         spin_unlock_irqrestore(io_lock, flags);
2504
2505         if (io_req) {
2506                 start_time = io_req->start_time;
2507                 fnic_release_ioreq_buf(fnic, io_req, sc);
2508                 mempool_free(io_req, fnic->io_req_pool);
2509         }
2510
2511 fnic_device_reset_end:
2512         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2513                   sc->request->tag, sc,
2514                   jiffies_to_msecs(jiffies - start_time),
2515                   0, ((u64)sc->cmnd[0] << 32 |
2516                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2517                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2518                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2519
2520         /* free tag if it is allocated */
2521         if (unlikely(tag_gen_flag))
2522                 fnic_scsi_host_end_tag(fnic, sc);
2523
2524         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2525                       "Returning from device reset %s\n",
2526                       (ret == SUCCESS) ?
2527                       "SUCCESS" : "FAILED");
2528
2529         if (ret == FAILED)
2530                 atomic64_inc(&reset_stats->device_reset_failures);
2531
2532         return ret;
2533 }
2534
2535 /* Clean up all IOs, clean up libFC local port */
2536 int fnic_reset(struct Scsi_Host *shost)
2537 {
2538         struct fc_lport *lp;
2539         struct fnic *fnic;
2540         int ret = 0;
2541         struct reset_stats *reset_stats;
2542
2543         lp = shost_priv(shost);
2544         fnic = lport_priv(lp);
2545         reset_stats = &fnic->fnic_stats.reset_stats;
2546
2547         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2548                       "fnic_reset called\n");
2549
2550         atomic64_inc(&reset_stats->fnic_resets);
2551
2552         /*
2553          * Reset local port, this will clean up libFC exchanges,
2554          * reset remote port sessions, and if link is up, begin flogi
2555          */
2556         ret = fc_lport_reset(lp);
2557
2558         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2559                       "Returning from fnic reset %s\n",
2560                       (ret == 0) ?
2561                       "SUCCESS" : "FAILED");
2562
2563         if (ret == 0)
2564                 atomic64_inc(&reset_stats->fnic_reset_completions);
2565         else
2566                 atomic64_inc(&reset_stats->fnic_reset_failures);
2567
2568         return ret;
2569 }
2570
2571 /*
2572  * SCSI Error handling calls driver's eh_host_reset if all prior
2573  * error handling levels return FAILED. If host reset completes
2574  * successfully, and if link is up, then Fabric login begins.
2575  *
2576  * Host Reset is the highest level of error recovery. If this fails, then
2577  * host is offlined by SCSI.
2578  *
2579  */
2580 int fnic_host_reset(struct scsi_cmnd *sc)
2581 {
2582         int ret;
2583         unsigned long wait_host_tmo;
2584         struct Scsi_Host *shost = sc->device->host;
2585         struct fc_lport *lp = shost_priv(shost);
2586         struct fnic *fnic = lport_priv(lp);
2587         unsigned long flags;
2588
2589         spin_lock_irqsave(&fnic->fnic_lock, flags);
2590         if (fnic->internal_reset_inprogress == 0) {
2591                 fnic->internal_reset_inprogress = 1;
2592         } else {
2593                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2594                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2595                         "host reset in progress skipping another host reset\n");
2596                 return SUCCESS;
2597         }
2598         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2599
2600         /*
2601          * If fnic_reset is successful, wait for fabric login to complete
2602          * scsi-ml tries to send a TUR to every device if host reset is
2603          * successful, so before returning to scsi, fabric should be up
2604          */
2605         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2606         if (ret == SUCCESS) {
2607                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2608                 ret = FAILED;
2609                 while (time_before(jiffies, wait_host_tmo)) {
2610                         if ((lp->state == LPORT_ST_READY) &&
2611                             (lp->link_up)) {
2612                                 ret = SUCCESS;
2613                                 break;
2614                         }
2615                         ssleep(1);
2616                 }
2617         }
2618
2619         spin_lock_irqsave(&fnic->fnic_lock, flags);
2620         fnic->internal_reset_inprogress = 0;
2621         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2622         return ret;
2623 }
2624
2625 /*
2626  * This fxn is called from libFC when host is removed
2627  */
2628 void fnic_scsi_abort_io(struct fc_lport *lp)
2629 {
2630         int err = 0;
2631         unsigned long flags;
2632         enum fnic_state old_state;
2633         struct fnic *fnic = lport_priv(lp);
2634         DECLARE_COMPLETION_ONSTACK(remove_wait);
2635
2636         /* Issue firmware reset for fnic, wait for reset to complete */
2637 retry_fw_reset:
2638         spin_lock_irqsave(&fnic->fnic_lock, flags);
2639         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2640                 /* fw reset is in progress, poll for its completion */
2641                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2642                 schedule_timeout(msecs_to_jiffies(100));
2643                 goto retry_fw_reset;
2644         }
2645
2646         fnic->remove_wait = &remove_wait;
2647         old_state = fnic->state;
2648         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2649         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2650         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2651
2652         err = fnic_fw_reset_handler(fnic);
2653         if (err) {
2654                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2655                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2656                         fnic->state = old_state;
2657                 fnic->remove_wait = NULL;
2658                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2659                 return;
2660         }
2661
2662         /* Wait for firmware reset to complete */
2663         wait_for_completion_timeout(&remove_wait,
2664                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2665
2666         spin_lock_irqsave(&fnic->fnic_lock, flags);
2667         fnic->remove_wait = NULL;
2668         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2669                       "fnic_scsi_abort_io %s\n",
2670                       (fnic->state == FNIC_IN_ETH_MODE) ?
2671                       "SUCCESS" : "FAILED");
2672         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2673
2674 }
2675
2676 /*
2677  * This fxn called from libFC to clean up driver IO state on link down
2678  */
2679 void fnic_scsi_cleanup(struct fc_lport *lp)
2680 {
2681         unsigned long flags;
2682         enum fnic_state old_state;
2683         struct fnic *fnic = lport_priv(lp);
2684
2685         /* issue fw reset */
2686 retry_fw_reset:
2687         spin_lock_irqsave(&fnic->fnic_lock, flags);
2688         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2689                 /* fw reset is in progress, poll for its completion */
2690                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2691                 schedule_timeout(msecs_to_jiffies(100));
2692                 goto retry_fw_reset;
2693         }
2694         old_state = fnic->state;
2695         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2696         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2697         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2698
2699         if (fnic_fw_reset_handler(fnic)) {
2700                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2701                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2702                         fnic->state = old_state;
2703                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2704         }
2705
2706 }
2707
2708 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2709 {
2710 }
2711
2712 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2713 {
2714         struct fnic *fnic = lport_priv(lp);
2715
2716         /* Non-zero sid, nothing to do */
2717         if (sid)
2718                 goto call_fc_exch_mgr_reset;
2719
2720         if (did) {
2721                 fnic_rport_exch_reset(fnic, did);
2722                 goto call_fc_exch_mgr_reset;
2723         }
2724
2725         /*
2726          * sid = 0, did = 0
2727          * link down or device being removed
2728          */
2729         if (!fnic->in_remove)
2730                 fnic_scsi_cleanup(lp);
2731         else
2732                 fnic_scsi_abort_io(lp);
2733
2734         /* call libFC exch mgr reset to reset its exchanges */
2735 call_fc_exch_mgr_reset:
2736         fc_exch_mgr_reset(lp, sid, did);
2737
2738 }
2739
2740 /*
2741  * fnic_is_abts_pending() is a helper function that
2742  * walks through tag map to check if there is any IOs pending,if there is one,
2743  * then it returns 1 (true), otherwise 0 (false)
2744  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2745  * otherwise, it checks for all IOs.
2746  */
2747 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2748 {
2749         int tag;
2750         struct fnic_io_req *io_req;
2751         spinlock_t *io_lock;
2752         unsigned long flags;
2753         int ret = 0;
2754         struct scsi_cmnd *sc;
2755         struct scsi_device *lun_dev = NULL;
2756
2757         if (lr_sc)
2758                 lun_dev = lr_sc->device;
2759
2760         /* walk again to check, if IOs are still pending in fw */
2761         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2762                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2763                 /*
2764                  * ignore this lun reset cmd or cmds that do not belong to
2765                  * this lun
2766                  */
2767                 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2768                         continue;
2769
2770                 io_lock = fnic_io_lock_hash(fnic, sc);
2771                 spin_lock_irqsave(io_lock, flags);
2772
2773                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2774
2775                 if (!io_req || sc->device != lun_dev) {
2776                         spin_unlock_irqrestore(io_lock, flags);
2777                         continue;
2778                 }
2779
2780                 /*
2781                  * Found IO that is still pending with firmware and
2782                  * belongs to the LUN that we are resetting
2783                  */
2784                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2785                               "Found IO in %s on lun\n",
2786                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2787
2788                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2789                         ret = 1;
2790                 spin_unlock_irqrestore(io_lock, flags);
2791         }
2792
2793         return ret;
2794 }