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_DELETE) {
 470                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 471                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 472                         rport->port_id);
 473
 474                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 475                 sc->result = DID_NO_CONNECT<<16;
 476                 done(sc);
 477                 return 0;
 478         }
 479
 480         if (rp->rp_state != RPORT_ST_READY) {
 481                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 482                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 483                         rport->port_id, rp->rp_state);
 484
 485                 sc->result = DID_IMM_RETRY << 16;
 486                 done(sc);
 487                 return 0;
 488         }
 489
 490         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 491                 return SCSI_MLQUEUE_HOST_BUSY;
 492
 493         atomic_inc(&fnic->in_flight);
 494
 495         /*
 496          * Release host lock, use driver resource specific locks from here.
 497          * Don't re-enable interrupts in case they were disabled prior to the
 498          * caller disabling them.
 499          */
 500         spin_unlock(lp->host->host_lock);
 501         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 502         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 503
 504         /* Get a new io_req for this SCSI IO */
 505         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 506         if (!io_req) {
 507                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 508                 ret = SCSI_MLQUEUE_HOST_BUSY;
 509                 goto out;
 510         }
 511         memset(io_req, 0, sizeof(*io_req));
 512
 513         /* Map the data buffer */
 514         sg_count = scsi_dma_map(sc);
 515         if (sg_count < 0) {
 516                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 517                           sc->request->tag, sc, 0, sc->cmnd[0],
 518                           sg_count, CMD_STATE(sc));
 519                 mempool_free(io_req, fnic->io_req_pool);
 520                 goto out;
 521         }
 522
 523         /* Determine the type of scatter/gather list we need */
 524         io_req->sgl_cnt = sg_count;
 525         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 526         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 527                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 528
 529         if (sg_count) {
 530                 io_req->sgl_list =
 531                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 532                                       GFP_ATOMIC);
 533                 if (!io_req->sgl_list) {
 534                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 535                         ret = SCSI_MLQUEUE_HOST_BUSY;
 536                         scsi_dma_unmap(sc);
 537                         mempool_free(io_req, fnic->io_req_pool);
 538                         goto out;
 539                 }
 540
 541                 /* Cache sgl list allocated address before alignment */
 542                 io_req->sgl_list_alloc = io_req->sgl_list;
 543                 ptr = (unsigned long) io_req->sgl_list;
 544                 if (ptr % FNIC_SG_DESC_ALIGN) {
 545                         io_req->sgl_list = (struct host_sg_desc *)
 546                                 (((unsigned long) ptr
 547                                   + FNIC_SG_DESC_ALIGN - 1)
 548                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 549                 }
 550         }
 551
 552         /*
 553         * Will acquire lock defore setting to IO initialized.
 554         */
 555
 556         io_lock = fnic_io_lock_hash(fnic, sc);
 557         spin_lock_irqsave(io_lock, flags);
 558
 559         /* initialize rest of io_req */
 560         io_lock_acquired = 1;
 561         io_req->port_id = rport->port_id;
 562         io_req->start_time = jiffies;
 563         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 564         CMD_SP(sc) = (char *)io_req;
 565         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 566         sc->scsi_done = done;
 567
 568         /* create copy wq desc and enqueue it */
 569         wq = &fnic->wq_copy[0];
 570         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 571         if (ret) {
 572                 /*
 573                  * In case another thread cancelled the request,
 574                  * refetch the pointer under the lock.
 575                  */
 576                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 577                           sc->request->tag, sc, 0, 0, 0,
 578                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 579                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 580                 CMD_SP(sc) = NULL;
 581                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 582                 spin_unlock_irqrestore(io_lock, flags);
 583                 if (io_req) {
 584                         fnic_release_ioreq_buf(fnic, io_req, sc);
 585                         mempool_free(io_req, fnic->io_req_pool);
 586                 }
 587                 atomic_dec(&fnic->in_flight);
 588                 /* acquire host lock before returning to SCSI */
 589                 spin_lock(lp->host->host_lock);
 590                 return ret;
 591         } else {
 592                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 593                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 594                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 595                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 596                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 597                              atomic64_read(&fnic_stats->io_stats.active_ios));
 598
 599                 /* REVISIT: Use per IO lock in the final code */
 600                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 601         }
 602 out:
 603         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 604                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 605                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 606                         sc->cmnd[5]);
 607
 608         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 609                   sc->request->tag, sc, io_req,
 610                   sg_count, cmd_trace,
 611                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 612
 613         /* if only we issued IO, will we have the io lock */
 614         if (io_lock_acquired)
 615                 spin_unlock_irqrestore(io_lock, flags);
 616
 617         atomic_dec(&fnic->in_flight);
 618         /* acquire host lock before returning to SCSI */
 619         spin_lock(lp->host->host_lock);
 620         return ret;
 621 }
 622
 623 DEF_SCSI_QCMD(fnic_queuecommand)
 624
 625 /*
 626  * fnic_fcpio_fw_reset_cmpl_handler
 627  * Routine to handle fw reset completion
 628  */
 629 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 630                                             struct fcpio_fw_req *desc)
 631 {
 632         u8 type;
 633         u8 hdr_status;
 634         struct fcpio_tag tag;
 635         int ret = 0;
 636         unsigned long flags;
 637         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 638
 639         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 640
 641         atomic64_inc(&reset_stats->fw_reset_completions);
 642
 643         /* Clean up all outstanding io requests */
 644         fnic_cleanup_io(fnic, SCSI_NO_TAG);
 645
 646         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 647         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 648         atomic64_set(&fnic->io_cmpl_skip, 0);
 649
 650         spin_lock_irqsave(&fnic->fnic_lock, flags);
 651
 652         /* fnic should be in FC_TRANS_ETH_MODE */
 653         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 654                 /* Check status of reset completion */
 655                 if (!hdr_status) {
 656                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 657                                       "reset cmpl success\n");
 658                         /* Ready to send flogi out */
 659                         fnic->state = FNIC_IN_ETH_MODE;
 660                 } else {
 661                         FNIC_SCSI_DBG(KERN_DEBUG,
 662                                       fnic->lport->host,
 663                                       "fnic fw_reset : failed %s\n",
 664                                       fnic_fcpio_status_to_str(hdr_status));
 665
 666                         /*
 667                          * Unable to change to eth mode, cannot send out flogi
 668                          * Change state to fc mode, so that subsequent Flogi
 669                          * requests from libFC will cause more attempts to
 670                          * reset the firmware. Free the cached flogi
 671                          */
 672                         fnic->state = FNIC_IN_FC_MODE;
 673                         atomic64_inc(&reset_stats->fw_reset_failures);
 674                         ret = -1;
 675                 }
 676         } else {
 677                 FNIC_SCSI_DBG(KERN_DEBUG,
 678                               fnic->lport->host,
 679                               "Unexpected state %s while processing"
 680                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 681                 atomic64_inc(&reset_stats->fw_reset_failures);
 682                 ret = -1;
 683         }
 684
 685         /* Thread removing device blocks till firmware reset is complete */
 686         if (fnic->remove_wait)
 687                 complete(fnic->remove_wait);
 688
 689         /*
 690          * If fnic is being removed, or fw reset failed
 691          * free the flogi frame. Else, send it out
 692          */
 693         if (fnic->remove_wait || ret) {
 694                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 695                 skb_queue_purge(&fnic->tx_queue);
 696                 goto reset_cmpl_handler_end;
 697         }
 698
 699         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 700
 701         fnic_flush_tx(fnic);
 702
 703  reset_cmpl_handler_end:
 704         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 705
 706         return ret;
 707 }
 708
 709 /*
 710  * fnic_fcpio_flogi_reg_cmpl_handler
 711  * Routine to handle flogi register completion
 712  */
 713 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 714                                              struct fcpio_fw_req *desc)
 715 {
 716         u8 type;
 717         u8 hdr_status;
 718         struct fcpio_tag tag;
 719         int ret = 0;
 720         unsigned long flags;
 721
 722         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 723
 724         /* Update fnic state based on status of flogi reg completion */
 725         spin_lock_irqsave(&fnic->fnic_lock, flags);
 726
 727         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 728
 729                 /* Check flogi registration completion status */
 730                 if (!hdr_status) {
 731                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 732                                       "flog reg succeeded\n");
 733                         fnic->state = FNIC_IN_FC_MODE;
 734                 } else {
 735                         FNIC_SCSI_DBG(KERN_DEBUG,
 736                                       fnic->lport->host,
 737                                       "fnic flogi reg :failed %s\n",
 738                                       fnic_fcpio_status_to_str(hdr_status));
 739                         fnic->state = FNIC_IN_ETH_MODE;
 740                         ret = -1;
 741                 }
 742         } else {
 743                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 744                               "Unexpected fnic state %s while"
 745                               " processing flogi reg completion\n",
 746                               fnic_state_to_str(fnic->state));
 747                 ret = -1;
 748         }
 749
 750         if (!ret) {
 751                 if (fnic->stop_rx_link_events) {
 752                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 753                         goto reg_cmpl_handler_end;
 754                 }
 755                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 756
 757                 fnic_flush_tx(fnic);
 758                 queue_work(fnic_event_queue, &fnic->frame_work);
 759         } else {
 760                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 761         }
 762
 763 reg_cmpl_handler_end:
 764         return ret;
 765 }
 766
 767 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 768                                         u16 request_out)
 769 {
 770         if (wq->to_clean_index <= wq->to_use_index) {
 771                 /* out of range, stale request_out index */
 772                 if (request_out < wq->to_clean_index ||
 773                     request_out >= wq->to_use_index)
 774                         return 0;
 775         } else {
 776                 /* out of range, stale request_out index */
 777                 if (request_out < wq->to_clean_index &&
 778                     request_out >= wq->to_use_index)
 779                         return 0;
 780         }
 781         /* request_out index is in range */
 782         return 1;
 783 }
 784
 785
 786 /*
 787  * Mark that ack received and store the Ack index. If there are multiple
 788  * acks received before Tx thread cleans it up, the latest value will be
 789  * used which is correct behavior. This state should be in the copy Wq
 790  * instead of in the fnic
 791  */
 792 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 793                                           unsigned int cq_index,
 794                                           struct fcpio_fw_req *desc)
 795 {
 796         struct vnic_wq_copy *wq;
 797         u16 request_out = desc->u.ack.request_out;
 798         unsigned long flags;
 799         u64 *ox_id_tag = (u64 *)(void *)desc;
 800
 801         /* mark the ack state */
 802         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 803         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 804
 805         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 806         if (is_ack_index_in_range(wq, request_out)) {
 807                 fnic->fw_ack_index[0] = request_out;
 808                 fnic->fw_ack_recd[0] = 1;
 809         } else
 810                 atomic64_inc(
 811                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 812
 813         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 814         FNIC_TRACE(fnic_fcpio_ack_handler,
 815                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 816                   ox_id_tag[4], ox_id_tag[5]);
 817 }
 818
 819 /*
 820  * fnic_fcpio_icmnd_cmpl_handler
 821  * Routine to handle icmnd completions
 822  */
 823 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 824                                          struct fcpio_fw_req *desc)
 825 {
 826         u8 type;
 827         u8 hdr_status;
 828         struct fcpio_tag tag;
 829         u32 id;
 830         u64 xfer_len = 0;
 831         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 832         struct fnic_io_req *io_req;
 833         struct scsi_cmnd *sc;
 834         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 835         unsigned long flags;
 836         spinlock_t *io_lock;
 837         u64 cmd_trace;
 838         unsigned long start_time;
 839         unsigned long io_duration_time;
 840
 841         /* Decode the cmpl description to get the io_req id */
 842         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 843         fcpio_tag_id_dec(&tag, &id);
 844         icmnd_cmpl = &desc->u.icmnd_cmpl;
 845
 846         if (id >= fnic->fnic_max_tag_id) {
 847                 shost_printk(KERN_ERR, fnic->lport->host,
 848                         "Tag out of range tag %x hdr status = %s\n",
 849                              id, fnic_fcpio_status_to_str(hdr_status));
 850                 return;
 851         }
 852
 853         sc = scsi_host_find_tag(fnic->lport->host, id);
 854         WARN_ON_ONCE(!sc);
 855         if (!sc) {
 856                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 857                 shost_printk(KERN_ERR, fnic->lport->host,
 858                           "icmnd_cmpl sc is null - "
 859                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 860                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 861                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 862                           fnic->lport->host->host_no, id,
 863                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 864                           (u64)icmnd_cmpl->_resvd0[0]),
 865                           ((u64)hdr_status << 16 |
 866                           (u64)icmnd_cmpl->scsi_status << 8 |
 867                           (u64)icmnd_cmpl->flags), desc,
 868                           (u64)icmnd_cmpl->residual, 0);
 869                 return;
 870         }
 871
 872         io_lock = fnic_io_lock_hash(fnic, sc);
 873         spin_lock_irqsave(io_lock, flags);
 874         io_req = (struct fnic_io_req *)CMD_SP(sc);
 875         WARN_ON_ONCE(!io_req);
 876         if (!io_req) {
 877                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 878                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 879                 spin_unlock_irqrestore(io_lock, flags);
 880                 shost_printk(KERN_ERR, fnic->lport->host,
 881                           "icmnd_cmpl io_req is null - "
 882                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 883                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 884                 return;
 885         }
 886         start_time = io_req->start_time;
 887
 888         /* firmware completed the io */
 889         io_req->io_completed = 1;
 890
 891         /*
 892          *  if SCSI-ML has already issued abort on this command,
 893          *  set completion of the IO. The abts path will clean it up
 894          */
 895         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 896
 897                 /*
 898                  * set the FNIC_IO_DONE so that this doesn't get
 899                  * flagged as 'out of order' if it was not aborted
 900                  */
 901                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 902                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 903                 spin_unlock_irqrestore(io_lock, flags);
 904                 if(FCPIO_ABORTED == hdr_status)
 905                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 906
 907                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 908                         "icmnd_cmpl abts pending "
 909                           "hdr status = %s tag = 0x%x sc = 0x%p "
 910                           "scsi_status = %x residual = %d\n",
 911                           fnic_fcpio_status_to_str(hdr_status),
 912                           id, sc,
 913                           icmnd_cmpl->scsi_status,
 914                           icmnd_cmpl->residual);
 915                 return;
 916         }
 917
 918         /* Mark the IO as complete */
 919         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 920
 921         icmnd_cmpl = &desc->u.icmnd_cmpl;
 922
 923         switch (hdr_status) {
 924         case FCPIO_SUCCESS:
 925                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 926                 xfer_len = scsi_bufflen(sc);
 927                 scsi_set_resid(sc, icmnd_cmpl->residual);
 928
 929                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
 930                         xfer_len -= icmnd_cmpl->residual;
 931
 932                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 933                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 934
 935                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 936                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 937                 break;
 938
 939         case FCPIO_TIMEOUT:          /* request was timed out */
 940                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 941                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 942                 break;
 943
 944         case FCPIO_ABORTED:          /* request was aborted */
 945                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 946                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 947                 break;
 948
 949         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 950                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 951                 scsi_set_resid(sc, icmnd_cmpl->residual);
 952                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 953                 break;
 954
 955         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 956                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 957                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 958                 break;
 959
 960         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 961                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 962                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 963                 break;
 964
 965         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 966                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 967                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 968                 break;
 969
 970         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 971                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 972                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 973                 break;
 974
 975         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 976                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 977                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 978                 break;
 979
 980         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 981         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 982         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 983         default:
 984                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 985                 break;
 986         }
 987
 988         /* Break link with the SCSI command */
 989         CMD_SP(sc) = NULL;
 990         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 991
 992         spin_unlock_irqrestore(io_lock, flags);
 993
 994         if (hdr_status != FCPIO_SUCCESS) {
 995                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 996                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 997                              fnic_fcpio_status_to_str(hdr_status));
 998         }
 999
1000         fnic_release_ioreq_buf(fnic, io_req, sc);
1001
1002         mempool_free(io_req, fnic->io_req_pool);
1003
1004         cmd_trace = ((u64)hdr_status << 56) |
1005                   (u64)icmnd_cmpl->scsi_status << 48 |
1006                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
1007                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1008                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
1009
1010         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
1011                   sc->device->host->host_no, id, sc,
1012                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
1013                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1014                   jiffies_to_msecs(jiffies - start_time)),
1015                   desc, cmd_trace,
1016                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1017
1018         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1019                 fnic->lport->host_stats.fcp_input_requests++;
1020                 fnic->fcp_input_bytes += xfer_len;
1021         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1022                 fnic->lport->host_stats.fcp_output_requests++;
1023                 fnic->fcp_output_bytes += xfer_len;
1024         } else
1025                 fnic->lport->host_stats.fcp_control_requests++;
1026
1027         atomic64_dec(&fnic_stats->io_stats.active_ios);
1028         if (atomic64_read(&fnic->io_cmpl_skip))
1029                 atomic64_dec(&fnic->io_cmpl_skip);
1030         else
1031                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1032
1033
1034         io_duration_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1035
1036         if(io_duration_time <= 10)
1037                 atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
1038         else if(io_duration_time <= 100)
1039                 atomic64_inc(&fnic_stats->io_stats.io_btw_10_to_100_msec);
1040         else if(io_duration_time <= 500)
1041                 atomic64_inc(&fnic_stats->io_stats.io_btw_100_to_500_msec);
1042         else if(io_duration_time <= 5000)
1043                 atomic64_inc(&fnic_stats->io_stats.io_btw_500_to_5000_msec);
1044         else if(io_duration_time <= 10000)
1045                 atomic64_inc(&fnic_stats->io_stats.io_btw_5000_to_10000_msec);
1046         else if(io_duration_time <= 30000)
1047                 atomic64_inc(&fnic_stats->io_stats.io_btw_10000_to_30000_msec);
1048         else {
1049                 atomic64_inc(&fnic_stats->io_stats.io_greater_than_30000_msec);
1050
1051                 if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
1052                         atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
1053         }
1054
1055         /* Call SCSI completion function to complete the IO */
1056         if (sc->scsi_done)
1057                 sc->scsi_done(sc);
1058 }
1059
1060 /* fnic_fcpio_itmf_cmpl_handler
1061  * Routine to handle itmf completions
1062  */
1063 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1064                                         struct fcpio_fw_req *desc)
1065 {
1066         u8 type;
1067         u8 hdr_status;
1068         struct fcpio_tag tag;
1069         u32 id;
1070         struct scsi_cmnd *sc;
1071         struct fnic_io_req *io_req;
1072         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1073         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1074         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1075         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1076         unsigned long flags;
1077         spinlock_t *io_lock;
1078         unsigned long start_time;
1079
1080         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1081         fcpio_tag_id_dec(&tag, &id);
1082
1083         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1084                 shost_printk(KERN_ERR, fnic->lport->host,
1085                 "Tag out of range tag %x hdr status = %s\n",
1086                 id, fnic_fcpio_status_to_str(hdr_status));
1087                 return;
1088         }
1089
1090         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1091         WARN_ON_ONCE(!sc);
1092         if (!sc) {
1093                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1094                 shost_printk(KERN_ERR, fnic->lport->host,
1095                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1096                           fnic_fcpio_status_to_str(hdr_status), id);
1097                 return;
1098         }
1099         io_lock = fnic_io_lock_hash(fnic, sc);
1100         spin_lock_irqsave(io_lock, flags);
1101         io_req = (struct fnic_io_req *)CMD_SP(sc);
1102         WARN_ON_ONCE(!io_req);
1103         if (!io_req) {
1104                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1105                 spin_unlock_irqrestore(io_lock, flags);
1106                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1107                 shost_printk(KERN_ERR, fnic->lport->host,
1108                           "itmf_cmpl io_req is null - "
1109                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1110                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1111                 return;
1112         }
1113         start_time = io_req->start_time;
1114
1115         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1116                 /* Abort and terminate completion of device reset req */
1117                 /* REVISIT : Add asserts about various flags */
1118                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1119                               "dev reset abts cmpl recd. id %x status %s\n",
1120                               id, fnic_fcpio_status_to_str(hdr_status));
1121                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1122                 CMD_ABTS_STATUS(sc) = hdr_status;
1123                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1124                 if (io_req->abts_done)
1125                         complete(io_req->abts_done);
1126                 spin_unlock_irqrestore(io_lock, flags);
1127         } else if (id & FNIC_TAG_ABORT) {
1128                 /* Completion of abort cmd */
1129                 switch (hdr_status) {
1130                 case FCPIO_SUCCESS:
1131                         break;
1132                 case FCPIO_TIMEOUT:
1133                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1134                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1135                         else
1136                                 atomic64_inc(
1137                                         &term_stats->terminate_fw_timeouts);
1138                         break;
1139                 case FCPIO_ITMF_REJECTED:
1140                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1141                                 "abort reject recd. id %d\n",
1142                                 (int)(id & FNIC_TAG_MASK));
1143                         break;
1144                 case FCPIO_IO_NOT_FOUND:
1145                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1146                                 atomic64_inc(&abts_stats->abort_io_not_found);
1147                         else
1148                                 atomic64_inc(
1149                                         &term_stats->terminate_io_not_found);
1150                         break;
1151                 default:
1152                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1153                                 atomic64_inc(&abts_stats->abort_failures);
1154                         else
1155                                 atomic64_inc(
1156                                         &term_stats->terminate_failures);
1157                         break;
1158                 }
1159                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1160                         /* This is a late completion. Ignore it */
1161                         spin_unlock_irqrestore(io_lock, flags);
1162                         return;
1163                 }
1164
1165                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1166                 CMD_ABTS_STATUS(sc) = hdr_status;
1167
1168                 /* If the status is IO not found consider it as success */
1169                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1170                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1171
1172                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1173                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1174
1175                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1176                               "abts cmpl recd. id %d status %s\n",
1177                               (int)(id & FNIC_TAG_MASK),
1178                               fnic_fcpio_status_to_str(hdr_status));
1179
1180                 /*
1181                  * If scsi_eh thread is blocked waiting for abts to complete,
1182                  * signal completion to it. IO will be cleaned in the thread
1183                  * else clean it in this context
1184                  */
1185                 if (io_req->abts_done) {
1186                         complete(io_req->abts_done);
1187                         spin_unlock_irqrestore(io_lock, flags);
1188                 } else {
1189                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1190                                       "abts cmpl, completing IO\n");
1191                         CMD_SP(sc) = NULL;
1192                         sc->result = (DID_ERROR << 16);
1193
1194                         spin_unlock_irqrestore(io_lock, flags);
1195
1196                         fnic_release_ioreq_buf(fnic, io_req, sc);
1197                         mempool_free(io_req, fnic->io_req_pool);
1198                         if (sc->scsi_done) {
1199                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1200                                         sc->device->host->host_no, id,
1201                                         sc,
1202                                         jiffies_to_msecs(jiffies - start_time),
1203                                         desc,
1204                                         (((u64)hdr_status << 40) |
1205                                         (u64)sc->cmnd[0] << 32 |
1206                                         (u64)sc->cmnd[2] << 24 |
1207                                         (u64)sc->cmnd[3] << 16 |
1208                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1209                                         (((u64)CMD_FLAGS(sc) << 32) |
1210                                         CMD_STATE(sc)));
1211                                 sc->scsi_done(sc);
1212                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1213                                 if (atomic64_read(&fnic->io_cmpl_skip))
1214                                         atomic64_dec(&fnic->io_cmpl_skip);
1215                                 else
1216                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1217                         }
1218                 }
1219
1220         } else if (id & FNIC_TAG_DEV_RST) {
1221                 /* Completion of device reset */
1222                 CMD_LR_STATUS(sc) = hdr_status;
1223                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1224                         spin_unlock_irqrestore(io_lock, flags);
1225                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1226                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1227                                   sc->device->host->host_no, id, sc,
1228                                   jiffies_to_msecs(jiffies - start_time),
1229                                   desc, 0,
1230                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1231                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1232                                 "Terminate pending "
1233                                 "dev reset cmpl recd. id %d status %s\n",
1234                                 (int)(id & FNIC_TAG_MASK),
1235                                 fnic_fcpio_status_to_str(hdr_status));
1236                         return;
1237                 }
1238                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1239                         /* Need to wait for terminate completion */
1240                         spin_unlock_irqrestore(io_lock, flags);
1241                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1242                                   sc->device->host->host_no, id, sc,
1243                                   jiffies_to_msecs(jiffies - start_time),
1244                                   desc, 0,
1245                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1246                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1247                                 "dev reset cmpl recd after time out. "
1248                                 "id %d status %s\n",
1249                                 (int)(id & FNIC_TAG_MASK),
1250                                 fnic_fcpio_status_to_str(hdr_status));
1251                         return;
1252                 }
1253                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1254                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1255                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1256                               "dev reset cmpl recd. id %d status %s\n",
1257                               (int)(id & FNIC_TAG_MASK),
1258                               fnic_fcpio_status_to_str(hdr_status));
1259                 if (io_req->dr_done)
1260                         complete(io_req->dr_done);
1261                 spin_unlock_irqrestore(io_lock, flags);
1262
1263         } else {
1264                 shost_printk(KERN_ERR, fnic->lport->host,
1265                              "Unexpected itmf io state %s tag %x\n",
1266                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1267                 spin_unlock_irqrestore(io_lock, flags);
1268         }
1269
1270 }
1271
1272 /*
1273  * fnic_fcpio_cmpl_handler
1274  * Routine to service the cq for wq_copy
1275  */
1276 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1277                                    unsigned int cq_index,
1278                                    struct fcpio_fw_req *desc)
1279 {
1280         struct fnic *fnic = vnic_dev_priv(vdev);
1281
1282         switch (desc->hdr.type) {
1283         case FCPIO_ICMND_CMPL: /* fw completed a command */
1284         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1285         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1286         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1287         case FCPIO_RESET_CMPL: /* fw completed reset */
1288                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1289                 break;
1290         default:
1291                 break;
1292         }
1293
1294         switch (desc->hdr.type) {
1295         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1296                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1297                 break;
1298
1299         case FCPIO_ICMND_CMPL: /* fw completed a command */
1300                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1301                 break;
1302
1303         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1304                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1305                 break;
1306
1307         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1308         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1309                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1310                 break;
1311
1312         case FCPIO_RESET_CMPL: /* fw completed reset */
1313                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1314                 break;
1315
1316         default:
1317                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1318                               "firmware completion type %d\n",
1319                               desc->hdr.type);
1320                 break;
1321         }
1322
1323         return 0;
1324 }
1325
1326 /*
1327  * fnic_wq_copy_cmpl_handler
1328  * Routine to process wq copy
1329  */
1330 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1331 {
1332         unsigned int wq_work_done = 0;
1333         unsigned int i, cq_index;
1334         unsigned int cur_work_done;
1335
1336         for (i = 0; i < fnic->wq_copy_count; i++) {
1337                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1338                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1339                                                      fnic_fcpio_cmpl_handler,
1340                                                      copy_work_to_do);
1341                 wq_work_done += cur_work_done;
1342         }
1343         return wq_work_done;
1344 }
1345
1346 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1347 {
1348         int i;
1349         struct fnic_io_req *io_req;
1350         unsigned long flags = 0;
1351         struct scsi_cmnd *sc;
1352         spinlock_t *io_lock;
1353         unsigned long start_time = 0;
1354         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1355
1356         for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1357                 if (i == exclude_id)
1358                         continue;
1359
1360                 io_lock = fnic_io_lock_tag(fnic, i);
1361                 spin_lock_irqsave(io_lock, flags);
1362                 sc = scsi_host_find_tag(fnic->lport->host, i);
1363                 if (!sc) {
1364                         spin_unlock_irqrestore(io_lock, flags);
1365                         continue;
1366                 }
1367
1368                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1369                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1370                         !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1371                         /*
1372                          * We will be here only when FW completes reset
1373                          * without sending completions for outstanding ios.
1374                          */
1375                         CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1376                         if (io_req && io_req->dr_done)
1377                                 complete(io_req->dr_done);
1378                         else if (io_req && io_req->abts_done)
1379                                 complete(io_req->abts_done);
1380                         spin_unlock_irqrestore(io_lock, flags);
1381                         continue;
1382                 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1383                         spin_unlock_irqrestore(io_lock, flags);
1384                         continue;
1385                 }
1386                 if (!io_req) {
1387                         spin_unlock_irqrestore(io_lock, flags);
1388                         goto cleanup_scsi_cmd;
1389                 }
1390
1391                 CMD_SP(sc) = NULL;
1392
1393                 spin_unlock_irqrestore(io_lock, flags);
1394
1395                 /*
1396                  * If there is a scsi_cmnd associated with this io_req, then
1397                  * free the corresponding state
1398                  */
1399                 start_time = io_req->start_time;
1400                 fnic_release_ioreq_buf(fnic, io_req, sc);
1401                 mempool_free(io_req, fnic->io_req_pool);
1402
1403 cleanup_scsi_cmd:
1404                 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1405                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1406                               "%s: sc duration = %lu DID_TRANSPORT_DISRUPTED\n",
1407                               __func__, (jiffies - start_time));
1408
1409                 if (atomic64_read(&fnic->io_cmpl_skip))
1410                         atomic64_dec(&fnic->io_cmpl_skip);
1411                 else
1412                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1413
1414                 /* Complete the command to SCSI */
1415                 if (sc->scsi_done) {
1416                         FNIC_TRACE(fnic_cleanup_io,
1417                                   sc->device->host->host_no, i, sc,
1418                                   jiffies_to_msecs(jiffies - start_time),
1419                                   0, ((u64)sc->cmnd[0] << 32 |
1420                                   (u64)sc->cmnd[2] << 24 |
1421                                   (u64)sc->cmnd[3] << 16 |
1422                                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1423                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1424
1425                         sc->scsi_done(sc);
1426                 }
1427         }
1428 }
1429
1430 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1431                                   struct fcpio_host_req *desc)
1432 {
1433         u32 id;
1434         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1435         struct fnic_io_req *io_req;
1436         struct scsi_cmnd *sc;
1437         unsigned long flags;
1438         spinlock_t *io_lock;
1439         unsigned long start_time = 0;
1440
1441         /* get the tag reference */
1442         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1443         id &= FNIC_TAG_MASK;
1444
1445         if (id >= fnic->fnic_max_tag_id)
1446                 return;
1447
1448         sc = scsi_host_find_tag(fnic->lport->host, id);
1449         if (!sc)
1450                 return;
1451
1452         io_lock = fnic_io_lock_hash(fnic, sc);
1453         spin_lock_irqsave(io_lock, flags);
1454
1455         /* Get the IO context which this desc refers to */
1456         io_req = (struct fnic_io_req *)CMD_SP(sc);
1457
1458         /* fnic interrupts are turned off by now */
1459
1460         if (!io_req) {
1461                 spin_unlock_irqrestore(io_lock, flags);
1462                 goto wq_copy_cleanup_scsi_cmd;
1463         }
1464
1465         CMD_SP(sc) = NULL;
1466
1467         spin_unlock_irqrestore(io_lock, flags);
1468
1469         start_time = io_req->start_time;
1470         fnic_release_ioreq_buf(fnic, io_req, sc);
1471         mempool_free(io_req, fnic->io_req_pool);
1472
1473 wq_copy_cleanup_scsi_cmd:
1474         sc->result = DID_NO_CONNECT << 16;
1475         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1476                       " DID_NO_CONNECT\n");
1477
1478         if (sc->scsi_done) {
1479                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1480                           sc->device->host->host_no, id, sc,
1481                           jiffies_to_msecs(jiffies - start_time),
1482                           0, ((u64)sc->cmnd[0] << 32 |
1483                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1484                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1485                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1486
1487                 sc->scsi_done(sc);
1488         }
1489 }
1490
1491 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1492                                           u32 task_req, u8 *fc_lun,
1493                                           struct fnic_io_req *io_req)
1494 {
1495         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1496         struct Scsi_Host *host = fnic->lport->host;
1497         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1498         unsigned long flags;
1499
1500         spin_lock_irqsave(host->host_lock, flags);
1501         if (unlikely(fnic_chk_state_flags_locked(fnic,
1502                                                 FNIC_FLAGS_IO_BLOCKED))) {
1503                 spin_unlock_irqrestore(host->host_lock, flags);
1504                 return 1;
1505         } else
1506                 atomic_inc(&fnic->in_flight);
1507         spin_unlock_irqrestore(host->host_lock, flags);
1508
1509         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1510
1511         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1512                 free_wq_copy_descs(fnic, wq);
1513
1514         if (!vnic_wq_copy_desc_avail(wq)) {
1515                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1516                 atomic_dec(&fnic->in_flight);
1517                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1518                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1519                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1520                 return 1;
1521         }
1522         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1523                                      0, task_req, tag, fc_lun, io_req->port_id,
1524                                      fnic->config.ra_tov, fnic->config.ed_tov);
1525
1526         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1527         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1528                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1529                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1530                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1531
1532         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1533         atomic_dec(&fnic->in_flight);
1534
1535         return 0;
1536 }
1537
1538 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1539 {
1540         int tag;
1541         int abt_tag;
1542         int term_cnt = 0;
1543         struct fnic_io_req *io_req;
1544         spinlock_t *io_lock;
1545         unsigned long flags;
1546         struct scsi_cmnd *sc;
1547         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1548         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1549         struct scsi_lun fc_lun;
1550         enum fnic_ioreq_state old_ioreq_state;
1551
1552         FNIC_SCSI_DBG(KERN_DEBUG,
1553                       fnic->lport->host,
1554                       "fnic_rport_exch_reset called portid 0x%06x\n",
1555                       port_id);
1556
1557         if (fnic->in_remove)
1558                 return;
1559
1560         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1561                 abt_tag = tag;
1562                 io_lock = fnic_io_lock_tag(fnic, tag);
1563                 spin_lock_irqsave(io_lock, flags);
1564                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1565                 if (!sc) {
1566                         spin_unlock_irqrestore(io_lock, flags);
1567                         continue;
1568                 }
1569
1570                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1571
1572                 if (!io_req || io_req->port_id != port_id) {
1573                         spin_unlock_irqrestore(io_lock, flags);
1574                         continue;
1575                 }
1576
1577                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1578                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1579                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1580                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1581                         sc);
1582                         spin_unlock_irqrestore(io_lock, flags);
1583                         continue;
1584                 }
1585
1586                 /*
1587                  * Found IO that is still pending with firmware and
1588                  * belongs to rport that went away
1589                  */
1590                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1591                         spin_unlock_irqrestore(io_lock, flags);
1592                         continue;
1593                 }
1594                 if (io_req->abts_done) {
1595                         shost_printk(KERN_ERR, fnic->lport->host,
1596                         "fnic_rport_exch_reset: io_req->abts_done is set "
1597                         "state is %s\n",
1598                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1599                 }
1600
1601                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1602                         shost_printk(KERN_ERR, fnic->lport->host,
1603                                   "rport_exch_reset "
1604                                   "IO not yet issued %p tag 0x%x flags "
1605                                   "%x state %d\n",
1606                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1607                 }
1608                 old_ioreq_state = CMD_STATE(sc);
1609                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1610                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1611                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1612                         atomic64_inc(&reset_stats->device_reset_terminates);
1613                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1614                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1615                         "fnic_rport_exch_reset dev rst sc 0x%p\n",
1616                         sc);
1617                 }
1618
1619                 BUG_ON(io_req->abts_done);
1620
1621                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1622                               "fnic_rport_reset_exch: Issuing abts\n");
1623
1624                 spin_unlock_irqrestore(io_lock, flags);
1625
1626                 /* Now queue the abort command to firmware */
1627                 int_to_scsilun(sc->device->lun, &fc_lun);
1628
1629                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1630                                             FCPIO_ITMF_ABT_TASK_TERM,
1631                                             fc_lun.scsi_lun, io_req)) {
1632                         /*
1633                          * Revert the cmd state back to old state, if
1634                          * it hasn't changed in between. This cmd will get
1635                          * aborted later by scsi_eh, or cleaned up during
1636                          * lun reset
1637                          */
1638                         spin_lock_irqsave(io_lock, flags);
1639                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1640                                 CMD_STATE(sc) = old_ioreq_state;
1641                         spin_unlock_irqrestore(io_lock, flags);
1642                 } else {
1643                         spin_lock_irqsave(io_lock, flags);
1644                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1645                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1646                         else
1647                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1648                         spin_unlock_irqrestore(io_lock, flags);
1649                         atomic64_inc(&term_stats->terminates);
1650                         term_cnt++;
1651                 }
1652         }
1653         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1654                 atomic64_set(&term_stats->max_terminates, term_cnt);
1655
1656 }
1657
1658 void fnic_terminate_rport_io(struct fc_rport *rport)
1659 {
1660         int tag;
1661         int abt_tag;
1662         int term_cnt = 0;
1663         struct fnic_io_req *io_req;
1664         spinlock_t *io_lock;
1665         unsigned long flags;
1666         struct scsi_cmnd *sc;
1667         struct scsi_lun fc_lun;
1668         struct fc_rport_libfc_priv *rdata;
1669         struct fc_lport *lport;
1670         struct fnic *fnic;
1671         struct fc_rport *cmd_rport;
1672         struct reset_stats *reset_stats;
1673         struct terminate_stats *term_stats;
1674         enum fnic_ioreq_state old_ioreq_state;
1675
1676         if (!rport) {
1677                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1678                 return;
1679         }
1680         rdata = rport->dd_data;
1681
1682         if (!rdata) {
1683                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1684                 return;
1685         }
1686         lport = rdata->local_port;
1687
1688         if (!lport) {
1689                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1690                 return;
1691         }
1692         fnic = lport_priv(lport);
1693         FNIC_SCSI_DBG(KERN_DEBUG,
1694                       fnic->lport->host, "fnic_terminate_rport_io called"
1695                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1696                       rport->port_name, rport->node_name, rport,
1697                       rport->port_id);
1698
1699         if (fnic->in_remove)
1700                 return;
1701
1702         reset_stats = &fnic->fnic_stats.reset_stats;
1703         term_stats = &fnic->fnic_stats.term_stats;
1704
1705         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1706                 abt_tag = tag;
1707                 io_lock = fnic_io_lock_tag(fnic, tag);
1708                 spin_lock_irqsave(io_lock, flags);
1709                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1710                 if (!sc) {
1711                         spin_unlock_irqrestore(io_lock, flags);
1712                         continue;
1713                 }
1714
1715                 cmd_rport = starget_to_rport(scsi_target(sc->device));
1716                 if (rport != cmd_rport) {
1717                         spin_unlock_irqrestore(io_lock, flags);
1718                         continue;
1719                 }
1720
1721                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1722
1723                 if (!io_req || rport != cmd_rport) {
1724                         spin_unlock_irqrestore(io_lock, flags);
1725                         continue;
1726                 }
1727
1728                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1729                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1730                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1731                         "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1732                         sc);
1733                         spin_unlock_irqrestore(io_lock, flags);
1734                         continue;
1735                 }
1736                 /*
1737                  * Found IO that is still pending with firmware and
1738                  * belongs to rport that went away
1739                  */
1740                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1741                         spin_unlock_irqrestore(io_lock, flags);
1742                         continue;
1743                 }
1744                 if (io_req->abts_done) {
1745                         shost_printk(KERN_ERR, fnic->lport->host,
1746                         "fnic_terminate_rport_io: io_req->abts_done is set "
1747                         "state is %s\n",
1748                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1749                 }
1750                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1751                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1752                                   "fnic_terminate_rport_io "
1753                                   "IO not yet issued %p tag 0x%x flags "
1754                                   "%x state %d\n",
1755                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1756                 }
1757                 old_ioreq_state = CMD_STATE(sc);
1758                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1759                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1760                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1761                         atomic64_inc(&reset_stats->device_reset_terminates);
1762                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1763                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1764                         "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1765                 }
1766
1767                 BUG_ON(io_req->abts_done);
1768
1769                 FNIC_SCSI_DBG(KERN_DEBUG,
1770                               fnic->lport->host,
1771                               "fnic_terminate_rport_io: Issuing abts\n");
1772
1773                 spin_unlock_irqrestore(io_lock, flags);
1774
1775                 /* Now queue the abort command to firmware */
1776                 int_to_scsilun(sc->device->lun, &fc_lun);
1777
1778                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1779                                             FCPIO_ITMF_ABT_TASK_TERM,
1780                                             fc_lun.scsi_lun, io_req)) {
1781                         /*
1782                          * Revert the cmd state back to old state, if
1783                          * it hasn't changed in between. This cmd will get
1784                          * aborted later by scsi_eh, or cleaned up during
1785                          * lun reset
1786                          */
1787                         spin_lock_irqsave(io_lock, flags);
1788                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1789                                 CMD_STATE(sc) = old_ioreq_state;
1790                         spin_unlock_irqrestore(io_lock, flags);
1791                 } else {
1792                         spin_lock_irqsave(io_lock, flags);
1793                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1794                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1795                         else
1796                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1797                         spin_unlock_irqrestore(io_lock, flags);
1798                         atomic64_inc(&term_stats->terminates);
1799                         term_cnt++;
1800                 }
1801         }
1802         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1803                 atomic64_set(&term_stats->max_terminates, term_cnt);
1804
1805 }
1806
1807 /*
1808  * This function is exported to SCSI for sending abort cmnds.
1809  * A SCSI IO is represented by a io_req in the driver.
1810  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1811  */
1812 int fnic_abort_cmd(struct scsi_cmnd *sc)
1813 {
1814         struct fc_lport *lp;
1815         struct fnic *fnic;
1816         struct fnic_io_req *io_req = NULL;
1817         struct fc_rport *rport;
1818         spinlock_t *io_lock;
1819         unsigned long flags;
1820         unsigned long start_time = 0;
1821         int ret = SUCCESS;
1822         u32 task_req = 0;
1823         struct scsi_lun fc_lun;
1824         struct fnic_stats *fnic_stats;
1825         struct abort_stats *abts_stats;
1826         struct terminate_stats *term_stats;
1827         enum fnic_ioreq_state old_ioreq_state;
1828         int tag;
1829         unsigned long abt_issued_time;
1830         DECLARE_COMPLETION_ONSTACK(tm_done);
1831
1832         /* Wait for rport to unblock */
1833         fc_block_scsi_eh(sc);
1834
1835         /* Get local-port, check ready and link up */
1836         lp = shost_priv(sc->device->host);
1837
1838         fnic = lport_priv(lp);
1839         fnic_stats = &fnic->fnic_stats;
1840         abts_stats = &fnic->fnic_stats.abts_stats;
1841         term_stats = &fnic->fnic_stats.term_stats;
1842
1843         rport = starget_to_rport(scsi_target(sc->device));
1844         tag = sc->request->tag;
1845         FNIC_SCSI_DBG(KERN_DEBUG,
1846                 fnic->lport->host,
1847                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1848                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1849
1850         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1851
1852         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1853                 ret = FAILED;
1854                 goto fnic_abort_cmd_end;
1855         }
1856
1857         /*
1858          * Avoid a race between SCSI issuing the abort and the device
1859          * completing the command.
1860          *
1861          * If the command is already completed by the fw cmpl code,
1862          * we just return SUCCESS from here. This means that the abort
1863          * succeeded. In the SCSI ML, since the timeout for command has
1864          * happened, the completion wont actually complete the command
1865          * and it will be considered as an aborted command
1866          *
1867          * The CMD_SP will not be cleared except while holding io_req_lock.
1868          */
1869         io_lock = fnic_io_lock_hash(fnic, sc);
1870         spin_lock_irqsave(io_lock, flags);
1871         io_req = (struct fnic_io_req *)CMD_SP(sc);
1872         if (!io_req) {
1873                 spin_unlock_irqrestore(io_lock, flags);
1874                 goto fnic_abort_cmd_end;
1875         }
1876
1877         io_req->abts_done = &tm_done;
1878
1879         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1880                 spin_unlock_irqrestore(io_lock, flags);
1881                 goto wait_pending;
1882         }
1883
1884         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1885         if (abt_issued_time <= 6000)
1886                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1887         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1888                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1889         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1890                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1891         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1892                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1893         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1894                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1895         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1896                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1897         else
1898                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1899
1900         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1901                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1902         /*
1903          * Command is still pending, need to abort it
1904          * If the firmware completes the command after this point,
1905          * the completion wont be done till mid-layer, since abort
1906          * has already started.
1907          */
1908         old_ioreq_state = CMD_STATE(sc);
1909         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1910         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1911
1912         spin_unlock_irqrestore(io_lock, flags);
1913
1914         /*
1915          * Check readiness of the remote port. If the path to remote
1916          * port is up, then send abts to the remote port to terminate
1917          * the IO. Else, just locally terminate the IO in the firmware
1918          */
1919         if (fc_remote_port_chkready(rport) == 0)
1920                 task_req = FCPIO_ITMF_ABT_TASK;
1921         else {
1922                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1923                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1924         }
1925
1926         /* Now queue the abort command to firmware */
1927         int_to_scsilun(sc->device->lun, &fc_lun);
1928
1929         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1930                                     fc_lun.scsi_lun, io_req)) {
1931                 spin_lock_irqsave(io_lock, flags);
1932                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1933                         CMD_STATE(sc) = old_ioreq_state;
1934                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1935                 if (io_req)
1936                         io_req->abts_done = NULL;
1937                 spin_unlock_irqrestore(io_lock, flags);
1938                 ret = FAILED;
1939                 goto fnic_abort_cmd_end;
1940         }
1941         if (task_req == FCPIO_ITMF_ABT_TASK) {
1942                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1943                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1944         } else {
1945                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1946                 atomic64_inc(&fnic_stats->term_stats.terminates);
1947         }
1948
1949         /*
1950          * We queued an abort IO, wait for its completion.
1951          * Once the firmware completes the abort command, it will
1952          * wake up this thread.
1953          */
1954  wait_pending:
1955         wait_for_completion_timeout(&tm_done,
1956                                     msecs_to_jiffies
1957                                     (2 * fnic->config.ra_tov +
1958                                      fnic->config.ed_tov));
1959
1960         /* Check the abort status */
1961         spin_lock_irqsave(io_lock, flags);
1962
1963         io_req = (struct fnic_io_req *)CMD_SP(sc);
1964         if (!io_req) {
1965                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1966                 spin_unlock_irqrestore(io_lock, flags);
1967                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1968                 ret = FAILED;
1969                 goto fnic_abort_cmd_end;
1970         }
1971         io_req->abts_done = NULL;
1972
1973         /* fw did not complete abort, timed out */
1974         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1975                 spin_unlock_irqrestore(io_lock, flags);
1976                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1977                         atomic64_inc(&abts_stats->abort_drv_timeouts);
1978                 } else {
1979                         atomic64_inc(&term_stats->terminate_drv_timeouts);
1980                 }
1981                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
1982                 ret = FAILED;
1983                 goto fnic_abort_cmd_end;
1984         }
1985
1986         /* IO out of order */
1987
1988         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
1989                 spin_unlock_irqrestore(io_lock, flags);
1990                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1991                         "Issuing Host reset due to out of order IO\n");
1992
1993                 ret = FAILED;
1994                 goto fnic_abort_cmd_end;
1995         }
1996
1997         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1998
1999         start_time = io_req->start_time;
2000         /*
2001          * firmware completed the abort, check the status,
2002          * free the io_req if successful. If abort fails,
2003          * Device reset will clean the I/O.
2004          */
2005         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
2006                 CMD_SP(sc) = NULL;
2007         else {
2008                 ret = FAILED;
2009                 spin_unlock_irqrestore(io_lock, flags);
2010                 goto fnic_abort_cmd_end;
2011         }
2012
2013         spin_unlock_irqrestore(io_lock, flags);
2014
2015         fnic_release_ioreq_buf(fnic, io_req, sc);
2016         mempool_free(io_req, fnic->io_req_pool);
2017
2018         if (sc->scsi_done) {
2019         /* Call SCSI completion function to complete the IO */
2020                 sc->result = (DID_ABORT << 16);
2021                 sc->scsi_done(sc);
2022                 atomic64_dec(&fnic_stats->io_stats.active_ios);
2023                 if (atomic64_read(&fnic->io_cmpl_skip))
2024                         atomic64_dec(&fnic->io_cmpl_skip);
2025                 else
2026                         atomic64_inc(&fnic_stats->io_stats.io_completions);
2027         }
2028
2029 fnic_abort_cmd_end:
2030         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
2031                   sc->request->tag, sc,
2032                   jiffies_to_msecs(jiffies - start_time),
2033                   0, ((u64)sc->cmnd[0] << 32 |
2034                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2035                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2036                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2037
2038         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2039                       "Returning from abort cmd type %x %s\n", task_req,
2040                       (ret == SUCCESS) ?
2041                       "SUCCESS" : "FAILED");
2042         return ret;
2043 }
2044
2045 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
2046                                        struct scsi_cmnd *sc,
2047                                        struct fnic_io_req *io_req)
2048 {
2049         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
2050         struct Scsi_Host *host = fnic->lport->host;
2051         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
2052         struct scsi_lun fc_lun;
2053         int ret = 0;
2054         unsigned long intr_flags;
2055
2056         spin_lock_irqsave(host->host_lock, intr_flags);
2057         if (unlikely(fnic_chk_state_flags_locked(fnic,
2058                                                 FNIC_FLAGS_IO_BLOCKED))) {
2059                 spin_unlock_irqrestore(host->host_lock, intr_flags);
2060                 return FAILED;
2061         } else
2062                 atomic_inc(&fnic->in_flight);
2063         spin_unlock_irqrestore(host->host_lock, intr_flags);
2064
2065         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2066
2067         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2068                 free_wq_copy_descs(fnic, wq);
2069
2070         if (!vnic_wq_copy_desc_avail(wq)) {
2071                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2072                           "queue_dr_io_req failure - no descriptors\n");
2073                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2074                 ret = -EAGAIN;
2075                 goto lr_io_req_end;
2076         }
2077
2078         /* fill in the lun info */
2079         int_to_scsilun(sc->device->lun, &fc_lun);
2080
2081         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2082                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2083                                      fc_lun.scsi_lun, io_req->port_id,
2084                                      fnic->config.ra_tov, fnic->config.ed_tov);
2085
2086         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2087         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2088                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2089                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2090                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2091
2092 lr_io_req_end:
2093         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2094         atomic_dec(&fnic->in_flight);
2095
2096         return ret;
2097 }
2098
2099 /*
2100  * Clean up any pending aborts on the lun
2101  * For each outstanding IO on this lun, whose abort is not completed by fw,
2102  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2103  * successfully aborted, 1 otherwise
2104  */
2105 static int fnic_clean_pending_aborts(struct fnic *fnic,
2106                                      struct scsi_cmnd *lr_sc,
2107                                          bool new_sc)
2108
2109 {
2110         int tag, abt_tag;
2111         struct fnic_io_req *io_req;
2112         spinlock_t *io_lock;
2113         unsigned long flags;
2114         int ret = 0;
2115         struct scsi_cmnd *sc;
2116         struct scsi_lun fc_lun;
2117         struct scsi_device *lun_dev = lr_sc->device;
2118         DECLARE_COMPLETION_ONSTACK(tm_done);
2119         enum fnic_ioreq_state old_ioreq_state;
2120
2121         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2122                 io_lock = fnic_io_lock_tag(fnic, tag);
2123                 spin_lock_irqsave(io_lock, flags);
2124                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2125                 /*
2126                  * ignore this lun reset cmd if issued using new SC
2127                  * or cmds that do not belong to this lun
2128                  */
2129                 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2130                         spin_unlock_irqrestore(io_lock, flags);
2131                         continue;
2132                 }
2133
2134                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2135
2136                 if (!io_req || sc->device != lun_dev) {
2137                         spin_unlock_irqrestore(io_lock, flags);
2138                         continue;
2139                 }
2140
2141                 /*
2142                  * Found IO that is still pending with firmware and
2143                  * belongs to the LUN that we are resetting
2144                  */
2145                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2146                               "Found IO in %s on lun\n",
2147                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2148
2149                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2150                         spin_unlock_irqrestore(io_lock, flags);
2151                         continue;
2152                 }
2153                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2154                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2155                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2156                                 "%s dev rst not pending sc 0x%p\n", __func__,
2157                                 sc);
2158                         spin_unlock_irqrestore(io_lock, flags);
2159                         continue;
2160                 }
2161
2162                 if (io_req->abts_done)
2163                         shost_printk(KERN_ERR, fnic->lport->host,
2164                           "%s: io_req->abts_done is set state is %s\n",
2165                           __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2166                 old_ioreq_state = CMD_STATE(sc);
2167                 /*
2168                  * Any pending IO issued prior to reset is expected to be
2169                  * in abts pending state, if not we need to set
2170                  * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2171                  * When IO is completed, the IO will be handed over and
2172                  * handled in this function.
2173                  */
2174                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2175
2176                 BUG_ON(io_req->abts_done);
2177
2178                 abt_tag = tag;
2179                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2180                         abt_tag |= FNIC_TAG_DEV_RST;
2181                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2182                                   "%s: dev rst sc 0x%p\n", __func__, sc);
2183                 }
2184
2185                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2186                 io_req->abts_done = &tm_done;
2187                 spin_unlock_irqrestore(io_lock, flags);
2188
2189                 /* Now queue the abort command to firmware */
2190                 int_to_scsilun(sc->device->lun, &fc_lun);
2191
2192                 if (fnic_queue_abort_io_req(fnic, abt_tag,
2193                                             FCPIO_ITMF_ABT_TASK_TERM,
2194                                             fc_lun.scsi_lun, io_req)) {
2195                         spin_lock_irqsave(io_lock, flags);
2196                         io_req = (struct fnic_io_req *)CMD_SP(sc);
2197                         if (io_req)
2198                                 io_req->abts_done = NULL;
2199                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2200                                 CMD_STATE(sc) = old_ioreq_state;
2201                         spin_unlock_irqrestore(io_lock, flags);
2202                         ret = 1;
2203                         goto clean_pending_aborts_end;
2204                 } else {
2205                         spin_lock_irqsave(io_lock, flags);
2206                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2207                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2208                         spin_unlock_irqrestore(io_lock, flags);
2209                 }
2210                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2211
2212                 wait_for_completion_timeout(&tm_done,
2213                                             msecs_to_jiffies
2214                                             (fnic->config.ed_tov));
2215
2216                 /* Recheck cmd state to check if it is now aborted */
2217                 spin_lock_irqsave(io_lock, flags);
2218                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2219                 if (!io_req) {
2220                         spin_unlock_irqrestore(io_lock, flags);
2221                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2222                         continue;
2223                 }
2224
2225                 io_req->abts_done = NULL;
2226
2227                 /* if abort is still pending with fw, fail */
2228                 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2229                         spin_unlock_irqrestore(io_lock, flags);
2230                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2231                         ret = 1;
2232                         goto clean_pending_aborts_end;
2233                 }
2234                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2235
2236                 /* original sc used for lr is handled by dev reset code */
2237                 if (sc != lr_sc)
2238                         CMD_SP(sc) = NULL;
2239                 spin_unlock_irqrestore(io_lock, flags);
2240
2241                 /* original sc used for lr is handled by dev reset code */
2242                 if (sc != lr_sc) {
2243                         fnic_release_ioreq_buf(fnic, io_req, sc);
2244                         mempool_free(io_req, fnic->io_req_pool);
2245                 }
2246
2247                 /*
2248                  * Any IO is returned during reset, it needs to call scsi_done
2249                  * to return the scsi_cmnd to upper layer.
2250                  */
2251                 if (sc->scsi_done) {
2252                         /* Set result to let upper SCSI layer retry */
2253                         sc->result = DID_RESET << 16;
2254                         sc->scsi_done(sc);
2255                 }
2256         }
2257
2258         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2259
2260         /* walk again to check, if IOs are still pending in fw */
2261         if (fnic_is_abts_pending(fnic, lr_sc))
2262                 ret = FAILED;
2263
2264 clean_pending_aborts_end:
2265         return ret;
2266 }
2267
2268 /**
2269  * fnic_scsi_host_start_tag
2270  * Allocates tagid from host's tag list
2271  **/
2272 static inline int
2273 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2274 {
2275         struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2276         int tag, ret = SCSI_NO_TAG;
2277
2278         BUG_ON(!bqt);
2279         if (!bqt) {
2280                 pr_err("Tags are not supported\n");
2281                 goto end;
2282         }
2283
2284         do {
2285                 tag = find_next_zero_bit(bqt->tag_map, bqt->max_depth, 1);
2286                 if (tag >= bqt->max_depth) {
2287                         pr_err("Tag allocation failure\n");
2288                         goto end;
2289                 }
2290         } while (test_and_set_bit(tag, bqt->tag_map));
2291
2292         bqt->tag_index[tag] = sc->request;
2293         sc->request->tag = tag;
2294         sc->tag = tag;
2295         if (!sc->request->special)
2296                 sc->request->special = sc;
2297
2298         ret = tag;
2299
2300 end:
2301         return ret;
2302 }
2303
2304 /**
2305  * fnic_scsi_host_end_tag
2306  * frees tag allocated by fnic_scsi_host_start_tag.
2307  **/
2308 static inline void
2309 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2310 {
2311         struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2312         int tag = sc->request->tag;
2313
2314         if (tag == SCSI_NO_TAG)
2315                 return;
2316
2317         BUG_ON(!bqt || !bqt->tag_index[tag]);
2318         if (!bqt)
2319                 return;
2320
2321         bqt->tag_index[tag] = NULL;
2322         clear_bit(tag, bqt->tag_map);
2323
2324         return;
2325 }
2326
2327 /*
2328  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2329  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2330  * on the LUN.
2331  */
2332 int fnic_device_reset(struct scsi_cmnd *sc)
2333 {
2334         struct fc_lport *lp;
2335         struct fnic *fnic;
2336         struct fnic_io_req *io_req = NULL;
2337         struct fc_rport *rport;
2338         int status;
2339         int ret = FAILED;
2340         spinlock_t *io_lock;
2341         unsigned long flags;
2342         unsigned long start_time = 0;
2343         struct scsi_lun fc_lun;
2344         struct fnic_stats *fnic_stats;
2345         struct reset_stats *reset_stats;
2346         int tag = 0;
2347         DECLARE_COMPLETION_ONSTACK(tm_done);
2348         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2349         bool new_sc = 0;
2350
2351         /* Wait for rport to unblock */
2352         fc_block_scsi_eh(sc);
2353
2354         /* Get local-port, check ready and link up */
2355         lp = shost_priv(sc->device->host);
2356
2357         fnic = lport_priv(lp);
2358         fnic_stats = &fnic->fnic_stats;
2359         reset_stats = &fnic->fnic_stats.reset_stats;
2360
2361         atomic64_inc(&reset_stats->device_resets);
2362
2363         rport = starget_to_rport(scsi_target(sc->device));
2364         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2365                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2366                       rport->port_id, sc->device->lun, sc);
2367
2368         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2369                 goto fnic_device_reset_end;
2370
2371         /* Check if remote port up */
2372         if (fc_remote_port_chkready(rport)) {
2373                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2374                 goto fnic_device_reset_end;
2375         }
2376
2377         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2378         /* Allocate tag if not present */
2379
2380         tag = sc->request->tag;
2381         if (unlikely(tag < 0)) {
2382                 /*
2383                  * XXX(hch): current the midlayer fakes up a struct
2384                  * request for the explicit reset ioctls, and those
2385                  * don't have a tag allocated to them.  The below
2386                  * code pokes into midlayer structures to paper over
2387                  * this design issue, but that won't work for blk-mq.
2388                  *
2389                  * Either someone who can actually test the hardware
2390                  * will have to come up with a similar hack for the
2391                  * blk-mq case, or we'll have to bite the bullet and
2392                  * fix the way the EH ioctls work for real, but until
2393                  * that happens we fail these explicit requests here.
2394                  */
2395
2396                 tag = fnic_scsi_host_start_tag(fnic, sc);
2397                 if (unlikely(tag == SCSI_NO_TAG))
2398                         goto fnic_device_reset_end;
2399                 tag_gen_flag = 1;
2400                 new_sc = 1;
2401         }
2402         io_lock = fnic_io_lock_hash(fnic, sc);
2403         spin_lock_irqsave(io_lock, flags);
2404         io_req = (struct fnic_io_req *)CMD_SP(sc);
2405
2406         /*
2407          * If there is a io_req attached to this command, then use it,
2408          * else allocate a new one.
2409          */
2410         if (!io_req) {
2411                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2412                 if (!io_req) {
2413                         spin_unlock_irqrestore(io_lock, flags);
2414                         goto fnic_device_reset_end;
2415                 }
2416                 memset(io_req, 0, sizeof(*io_req));
2417                 io_req->port_id = rport->port_id;
2418                 CMD_SP(sc) = (char *)io_req;
2419         }
2420         io_req->dr_done = &tm_done;
2421         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2422         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2423         spin_unlock_irqrestore(io_lock, flags);
2424
2425         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2426
2427         /*
2428          * issue the device reset, if enqueue failed, clean up the ioreq
2429          * and break assoc with scsi cmd
2430          */
2431         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2432                 spin_lock_irqsave(io_lock, flags);
2433                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2434                 if (io_req)
2435                         io_req->dr_done = NULL;
2436                 goto fnic_device_reset_clean;
2437         }
2438         spin_lock_irqsave(io_lock, flags);
2439         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2440         spin_unlock_irqrestore(io_lock, flags);
2441
2442         /*
2443          * Wait on the local completion for LUN reset.  The io_req may be
2444          * freed while we wait since we hold no lock.
2445          */
2446         wait_for_completion_timeout(&tm_done,
2447                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2448
2449         spin_lock_irqsave(io_lock, flags);
2450         io_req = (struct fnic_io_req *)CMD_SP(sc);
2451         if (!io_req) {
2452                 spin_unlock_irqrestore(io_lock, flags);
2453                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2454                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2455                 goto fnic_device_reset_end;
2456         }
2457         io_req->dr_done = NULL;
2458
2459         status = CMD_LR_STATUS(sc);
2460
2461         /*
2462          * If lun reset not completed, bail out with failed. io_req
2463          * gets cleaned up during higher levels of EH
2464          */
2465         if (status == FCPIO_INVALID_CODE) {
2466                 atomic64_inc(&reset_stats->device_reset_timeouts);
2467                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2468                               "Device reset timed out\n");
2469                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2470                 spin_unlock_irqrestore(io_lock, flags);
2471                 int_to_scsilun(sc->device->lun, &fc_lun);
2472                 /*
2473                  * Issue abort and terminate on device reset request.
2474                  * If q'ing of terminate fails, retry it after a delay.
2475                  */
2476                 while (1) {
2477                         spin_lock_irqsave(io_lock, flags);
2478                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2479                                 spin_unlock_irqrestore(io_lock, flags);
2480                                 break;
2481                         }
2482                         spin_unlock_irqrestore(io_lock, flags);
2483                         if (fnic_queue_abort_io_req(fnic,
2484                                 tag | FNIC_TAG_DEV_RST,
2485                                 FCPIO_ITMF_ABT_TASK_TERM,
2486                                 fc_lun.scsi_lun, io_req)) {
2487                                 wait_for_completion_timeout(&tm_done,
2488                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2489                         } else {
2490                                 spin_lock_irqsave(io_lock, flags);
2491                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2492                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2493                                 io_req->abts_done = &tm_done;
2494                                 spin_unlock_irqrestore(io_lock, flags);
2495                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2496                                 "Abort and terminate issued on Device reset "
2497                                 "tag 0x%x sc 0x%p\n", tag, sc);
2498                                 break;
2499                         }
2500                 }
2501                 while (1) {
2502                         spin_lock_irqsave(io_lock, flags);
2503                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2504                                 spin_unlock_irqrestore(io_lock, flags);
2505                                 wait_for_completion_timeout(&tm_done,
2506                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2507                                 break;
2508                         } else {
2509                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2510                                 io_req->abts_done = NULL;
2511                                 goto fnic_device_reset_clean;
2512                         }
2513                 }
2514         } else {
2515                 spin_unlock_irqrestore(io_lock, flags);
2516         }
2517
2518         /* Completed, but not successful, clean up the io_req, return fail */
2519         if (status != FCPIO_SUCCESS) {
2520                 spin_lock_irqsave(io_lock, flags);
2521                 FNIC_SCSI_DBG(KERN_DEBUG,
2522                               fnic->lport->host,
2523                               "Device reset completed - failed\n");
2524                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2525                 goto fnic_device_reset_clean;
2526         }
2527
2528         /*
2529          * Clean up any aborts on this lun that have still not
2530          * completed. If any of these fail, then LUN reset fails.
2531          * clean_pending_aborts cleans all cmds on this lun except
2532          * the lun reset cmd. If all cmds get cleaned, the lun reset
2533          * succeeds
2534          */
2535         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2536                 spin_lock_irqsave(io_lock, flags);
2537                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2538                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2539                               "Device reset failed"
2540                               " since could not abort all IOs\n");
2541                 goto fnic_device_reset_clean;
2542         }
2543
2544         /* Clean lun reset command */
2545         spin_lock_irqsave(io_lock, flags);
2546         io_req = (struct fnic_io_req *)CMD_SP(sc);
2547         if (io_req)
2548                 /* Completed, and successful */
2549                 ret = SUCCESS;
2550
2551 fnic_device_reset_clean:
2552         if (io_req)
2553                 CMD_SP(sc) = NULL;
2554
2555         spin_unlock_irqrestore(io_lock, flags);
2556
2557         if (io_req) {
2558                 start_time = io_req->start_time;
2559                 fnic_release_ioreq_buf(fnic, io_req, sc);
2560                 mempool_free(io_req, fnic->io_req_pool);
2561         }
2562
2563 fnic_device_reset_end:
2564         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2565                   sc->request->tag, sc,
2566                   jiffies_to_msecs(jiffies - start_time),
2567                   0, ((u64)sc->cmnd[0] << 32 |
2568                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2569                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2570                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2571
2572         /* free tag if it is allocated */
2573         if (unlikely(tag_gen_flag))
2574                 fnic_scsi_host_end_tag(fnic, sc);
2575
2576         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2577                       "Returning from device reset %s\n",
2578                       (ret == SUCCESS) ?
2579                       "SUCCESS" : "FAILED");
2580
2581         if (ret == FAILED)
2582                 atomic64_inc(&reset_stats->device_reset_failures);
2583
2584         return ret;
2585 }
2586
2587 /* Clean up all IOs, clean up libFC local port */
2588 int fnic_reset(struct Scsi_Host *shost)
2589 {
2590         struct fc_lport *lp;
2591         struct fnic *fnic;
2592         int ret = 0;
2593         struct reset_stats *reset_stats;
2594
2595         lp = shost_priv(shost);
2596         fnic = lport_priv(lp);
2597         reset_stats = &fnic->fnic_stats.reset_stats;
2598
2599         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2600                       "fnic_reset called\n");
2601
2602         atomic64_inc(&reset_stats->fnic_resets);
2603
2604         /*
2605          * Reset local port, this will clean up libFC exchanges,
2606          * reset remote port sessions, and if link is up, begin flogi
2607          */
2608         ret = fc_lport_reset(lp);
2609
2610         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2611                       "Returning from fnic reset %s\n",
2612                       (ret == 0) ?
2613                       "SUCCESS" : "FAILED");
2614
2615         if (ret == 0)
2616                 atomic64_inc(&reset_stats->fnic_reset_completions);
2617         else
2618                 atomic64_inc(&reset_stats->fnic_reset_failures);
2619
2620         return ret;
2621 }
2622
2623 /*
2624  * SCSI Error handling calls driver's eh_host_reset if all prior
2625  * error handling levels return FAILED. If host reset completes
2626  * successfully, and if link is up, then Fabric login begins.
2627  *
2628  * Host Reset is the highest level of error recovery. If this fails, then
2629  * host is offlined by SCSI.
2630  *
2631  */
2632 int fnic_host_reset(struct scsi_cmnd *sc)
2633 {
2634         int ret;
2635         unsigned long wait_host_tmo;
2636         struct Scsi_Host *shost = sc->device->host;
2637         struct fc_lport *lp = shost_priv(shost);
2638         struct fnic *fnic = lport_priv(lp);
2639         unsigned long flags;
2640
2641         spin_lock_irqsave(&fnic->fnic_lock, flags);
2642         if (fnic->internal_reset_inprogress == 0) {
2643                 fnic->internal_reset_inprogress = 1;
2644         } else {
2645                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2646                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2647                         "host reset in progress skipping another host reset\n");
2648                 return SUCCESS;
2649         }
2650         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2651
2652         /*
2653          * If fnic_reset is successful, wait for fabric login to complete
2654          * scsi-ml tries to send a TUR to every device if host reset is
2655          * successful, so before returning to scsi, fabric should be up
2656          */
2657         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2658         if (ret == SUCCESS) {
2659                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2660                 ret = FAILED;
2661                 while (time_before(jiffies, wait_host_tmo)) {
2662                         if ((lp->state == LPORT_ST_READY) &&
2663                             (lp->link_up)) {
2664                                 ret = SUCCESS;
2665                                 break;
2666                         }
2667                         ssleep(1);
2668                 }
2669         }
2670
2671         spin_lock_irqsave(&fnic->fnic_lock, flags);
2672         fnic->internal_reset_inprogress = 0;
2673         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2674         return ret;
2675 }
2676
2677 /*
2678  * This fxn is called from libFC when host is removed
2679  */
2680 void fnic_scsi_abort_io(struct fc_lport *lp)
2681 {
2682         int err = 0;
2683         unsigned long flags;
2684         enum fnic_state old_state;
2685         struct fnic *fnic = lport_priv(lp);
2686         DECLARE_COMPLETION_ONSTACK(remove_wait);
2687
2688         /* Issue firmware reset for fnic, wait for reset to complete */
2689 retry_fw_reset:
2690         spin_lock_irqsave(&fnic->fnic_lock, flags);
2691         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2692                 /* fw reset is in progress, poll for its completion */
2693                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2694                 schedule_timeout(msecs_to_jiffies(100));
2695                 goto retry_fw_reset;
2696         }
2697
2698         fnic->remove_wait = &remove_wait;
2699         old_state = fnic->state;
2700         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2701         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2702         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2703
2704         err = fnic_fw_reset_handler(fnic);
2705         if (err) {
2706                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2707                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2708                         fnic->state = old_state;
2709                 fnic->remove_wait = NULL;
2710                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2711                 return;
2712         }
2713
2714         /* Wait for firmware reset to complete */
2715         wait_for_completion_timeout(&remove_wait,
2716                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2717
2718         spin_lock_irqsave(&fnic->fnic_lock, flags);
2719         fnic->remove_wait = NULL;
2720         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2721                       "fnic_scsi_abort_io %s\n",
2722                       (fnic->state == FNIC_IN_ETH_MODE) ?
2723                       "SUCCESS" : "FAILED");
2724         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2725
2726 }
2727
2728 /*
2729  * This fxn called from libFC to clean up driver IO state on link down
2730  */
2731 void fnic_scsi_cleanup(struct fc_lport *lp)
2732 {
2733         unsigned long flags;
2734         enum fnic_state old_state;
2735         struct fnic *fnic = lport_priv(lp);
2736
2737         /* issue fw reset */
2738 retry_fw_reset:
2739         spin_lock_irqsave(&fnic->fnic_lock, flags);
2740         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2741                 /* fw reset is in progress, poll for its completion */
2742                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2743                 schedule_timeout(msecs_to_jiffies(100));
2744                 goto retry_fw_reset;
2745         }
2746         old_state = fnic->state;
2747         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2748         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2749         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2750
2751         if (fnic_fw_reset_handler(fnic)) {
2752                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2753                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2754                         fnic->state = old_state;
2755                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2756         }
2757
2758 }
2759
2760 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2761 {
2762 }
2763
2764 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2765 {
2766         struct fnic *fnic = lport_priv(lp);
2767
2768         /* Non-zero sid, nothing to do */
2769         if (sid)
2770                 goto call_fc_exch_mgr_reset;
2771
2772         if (did) {
2773                 fnic_rport_exch_reset(fnic, did);
2774                 goto call_fc_exch_mgr_reset;
2775         }
2776
2777         /*
2778          * sid = 0, did = 0
2779          * link down or device being removed
2780          */
2781         if (!fnic->in_remove)
2782                 fnic_scsi_cleanup(lp);
2783         else
2784                 fnic_scsi_abort_io(lp);
2785
2786         /* call libFC exch mgr reset to reset its exchanges */
2787 call_fc_exch_mgr_reset:
2788         fc_exch_mgr_reset(lp, sid, did);
2789
2790 }
2791
2792 /*
2793  * fnic_is_abts_pending() is a helper function that
2794  * walks through tag map to check if there is any IOs pending,if there is one,
2795  * then it returns 1 (true), otherwise 0 (false)
2796  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2797  * otherwise, it checks for all IOs.
2798  */
2799 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2800 {
2801         int tag;
2802         struct fnic_io_req *io_req;
2803         spinlock_t *io_lock;
2804         unsigned long flags;
2805         int ret = 0;
2806         struct scsi_cmnd *sc;
2807         struct scsi_device *lun_dev = NULL;
2808
2809         if (lr_sc)
2810                 lun_dev = lr_sc->device;
2811
2812         /* walk again to check, if IOs are still pending in fw */
2813         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2814                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2815                 /*
2816                  * ignore this lun reset cmd or cmds that do not belong to
2817                  * this lun
2818                  */
2819                 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2820                         continue;
2821
2822                 io_lock = fnic_io_lock_hash(fnic, sc);
2823                 spin_lock_irqsave(io_lock, flags);
2824
2825                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2826
2827                 if (!io_req || sc->device != lun_dev) {
2828                         spin_unlock_irqrestore(io_lock, flags);
2829                         continue;
2830                 }
2831
2832                 /*
2833                  * Found IO that is still pending with firmware and
2834                  * belongs to the LUN that we are resetting
2835                  */
2836                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2837                               "Found IO in %s on lun\n",
2838                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2839
2840                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2841                         ret = 1;
2842                 spin_unlock_irqrestore(io_lock, flags);
2843         }
2844
2845         return ret;
2846 }