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         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_FWRESET)))
 450                 return SCSI_MLQUEUE_HOST_BUSY;
 451
 452         rport = starget_to_rport(scsi_target(sc->device));
 453         if (!rport) {
 454                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 455                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 456                 sc->result = DID_NO_CONNECT << 16;
 457                 done(sc);
 458                 return 0;
 459         }
 460
 461         ret = fc_remote_port_chkready(rport);
 462         if (ret) {
 463                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 464                                 "rport is not ready\n");
 465                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 466                 sc->result = ret;
 467                 done(sc);
 468                 return 0;
 469         }
 470
 471         rp = rport->dd_data;
 472         if (!rp || rp->rp_state == RPORT_ST_DELETE) {
 473                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 474                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 475                         rport->port_id);
 476
 477                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 478                 sc->result = DID_NO_CONNECT<<16;
 479                 done(sc);
 480                 return 0;
 481         }
 482
 483         if (rp->rp_state != RPORT_ST_READY) {
 484                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 485                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 486                         rport->port_id, rp->rp_state);
 487
 488                 sc->result = DID_IMM_RETRY << 16;
 489                 done(sc);
 490                 return 0;
 491         }
 492
 493         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 494                 return SCSI_MLQUEUE_HOST_BUSY;
 495
 496         atomic_inc(&fnic->in_flight);
 497
 498         /*
 499          * Release host lock, use driver resource specific locks from here.
 500          * Don't re-enable interrupts in case they were disabled prior to the
 501          * caller disabling them.
 502          */
 503         spin_unlock(lp->host->host_lock);
 504         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 505         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 506
 507         /* Get a new io_req for this SCSI IO */
 508         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 509         if (!io_req) {
 510                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 511                 ret = SCSI_MLQUEUE_HOST_BUSY;
 512                 goto out;
 513         }
 514         memset(io_req, 0, sizeof(*io_req));
 515
 516         /* Map the data buffer */
 517         sg_count = scsi_dma_map(sc);
 518         if (sg_count < 0) {
 519                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 520                           sc->request->tag, sc, 0, sc->cmnd[0],
 521                           sg_count, CMD_STATE(sc));
 522                 mempool_free(io_req, fnic->io_req_pool);
 523                 goto out;
 524         }
 525
 526         /* Determine the type of scatter/gather list we need */
 527         io_req->sgl_cnt = sg_count;
 528         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 529         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 530                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 531
 532         if (sg_count) {
 533                 io_req->sgl_list =
 534                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 535                                       GFP_ATOMIC);
 536                 if (!io_req->sgl_list) {
 537                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 538                         ret = SCSI_MLQUEUE_HOST_BUSY;
 539                         scsi_dma_unmap(sc);
 540                         mempool_free(io_req, fnic->io_req_pool);
 541                         goto out;
 542                 }
 543
 544                 /* Cache sgl list allocated address before alignment */
 545                 io_req->sgl_list_alloc = io_req->sgl_list;
 546                 ptr = (unsigned long) io_req->sgl_list;
 547                 if (ptr % FNIC_SG_DESC_ALIGN) {
 548                         io_req->sgl_list = (struct host_sg_desc *)
 549                                 (((unsigned long) ptr
 550                                   + FNIC_SG_DESC_ALIGN - 1)
 551                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 552                 }
 553         }
 554
 555         /*
 556         * Will acquire lock defore setting to IO initialized.
 557         */
 558
 559         io_lock = fnic_io_lock_hash(fnic, sc);
 560         spin_lock_irqsave(io_lock, flags);
 561
 562         /* initialize rest of io_req */
 563         io_lock_acquired = 1;
 564         io_req->port_id = rport->port_id;
 565         io_req->start_time = jiffies;
 566         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 567         CMD_SP(sc) = (char *)io_req;
 568         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 569         sc->scsi_done = done;
 570
 571         /* create copy wq desc and enqueue it */
 572         wq = &fnic->wq_copy[0];
 573         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 574         if (ret) {
 575                 /*
 576                  * In case another thread cancelled the request,
 577                  * refetch the pointer under the lock.
 578                  */
 579                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 580                           sc->request->tag, sc, 0, 0, 0,
 581                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 582                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 583                 CMD_SP(sc) = NULL;
 584                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 585                 spin_unlock_irqrestore(io_lock, flags);
 586                 if (io_req) {
 587                         fnic_release_ioreq_buf(fnic, io_req, sc);
 588                         mempool_free(io_req, fnic->io_req_pool);
 589                 }
 590                 atomic_dec(&fnic->in_flight);
 591                 /* acquire host lock before returning to SCSI */
 592                 spin_lock(lp->host->host_lock);
 593                 return ret;
 594         } else {
 595                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 596                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 597                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 598                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 599                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 600                              atomic64_read(&fnic_stats->io_stats.active_ios));
 601
 602                 /* REVISIT: Use per IO lock in the final code */
 603                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 604         }
 605 out:
 606         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 607                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 608                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 609                         sc->cmnd[5]);
 610
 611         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 612                   sc->request->tag, sc, io_req,
 613                   sg_count, cmd_trace,
 614                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 615
 616         /* if only we issued IO, will we have the io lock */
 617         if (io_lock_acquired)
 618                 spin_unlock_irqrestore(io_lock, flags);
 619
 620         atomic_dec(&fnic->in_flight);
 621         /* acquire host lock before returning to SCSI */
 622         spin_lock(lp->host->host_lock);
 623         return ret;
 624 }
 625
 626 DEF_SCSI_QCMD(fnic_queuecommand)
 627
 628 /*
 629  * fnic_fcpio_fw_reset_cmpl_handler
 630  * Routine to handle fw reset completion
 631  */
 632 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 633                                             struct fcpio_fw_req *desc)
 634 {
 635         u8 type;
 636         u8 hdr_status;
 637         struct fcpio_tag tag;
 638         int ret = 0;
 639         unsigned long flags;
 640         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 641
 642         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 643
 644         atomic64_inc(&reset_stats->fw_reset_completions);
 645
 646         /* Clean up all outstanding io requests */
 647         fnic_cleanup_io(fnic, SCSI_NO_TAG);
 648
 649         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 650         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 651         atomic64_set(&fnic->io_cmpl_skip, 0);
 652
 653         spin_lock_irqsave(&fnic->fnic_lock, flags);
 654
 655         /* fnic should be in FC_TRANS_ETH_MODE */
 656         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 657                 /* Check status of reset completion */
 658                 if (!hdr_status) {
 659                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 660                                       "reset cmpl success\n");
 661                         /* Ready to send flogi out */
 662                         fnic->state = FNIC_IN_ETH_MODE;
 663                 } else {
 664                         FNIC_SCSI_DBG(KERN_DEBUG,
 665                                       fnic->lport->host,
 666                                       "fnic fw_reset : failed %s\n",
 667                                       fnic_fcpio_status_to_str(hdr_status));
 668
 669                         /*
 670                          * Unable to change to eth mode, cannot send out flogi
 671                          * Change state to fc mode, so that subsequent Flogi
 672                          * requests from libFC will cause more attempts to
 673                          * reset the firmware. Free the cached flogi
 674                          */
 675                         fnic->state = FNIC_IN_FC_MODE;
 676                         atomic64_inc(&reset_stats->fw_reset_failures);
 677                         ret = -1;
 678                 }
 679         } else {
 680                 FNIC_SCSI_DBG(KERN_DEBUG,
 681                               fnic->lport->host,
 682                               "Unexpected state %s while processing"
 683                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 684                 atomic64_inc(&reset_stats->fw_reset_failures);
 685                 ret = -1;
 686         }
 687
 688         /* Thread removing device blocks till firmware reset is complete */
 689         if (fnic->remove_wait)
 690                 complete(fnic->remove_wait);
 691
 692         /*
 693          * If fnic is being removed, or fw reset failed
 694          * free the flogi frame. Else, send it out
 695          */
 696         if (fnic->remove_wait || ret) {
 697                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 698                 skb_queue_purge(&fnic->tx_queue);
 699                 goto reset_cmpl_handler_end;
 700         }
 701
 702         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 703
 704         fnic_flush_tx(fnic);
 705
 706  reset_cmpl_handler_end:
 707         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 708
 709         return ret;
 710 }
 711
 712 /*
 713  * fnic_fcpio_flogi_reg_cmpl_handler
 714  * Routine to handle flogi register completion
 715  */
 716 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 717                                              struct fcpio_fw_req *desc)
 718 {
 719         u8 type;
 720         u8 hdr_status;
 721         struct fcpio_tag tag;
 722         int ret = 0;
 723         unsigned long flags;
 724
 725         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 726
 727         /* Update fnic state based on status of flogi reg completion */
 728         spin_lock_irqsave(&fnic->fnic_lock, flags);
 729
 730         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 731
 732                 /* Check flogi registration completion status */
 733                 if (!hdr_status) {
 734                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 735                                       "flog reg succeeded\n");
 736                         fnic->state = FNIC_IN_FC_MODE;
 737                 } else {
 738                         FNIC_SCSI_DBG(KERN_DEBUG,
 739                                       fnic->lport->host,
 740                                       "fnic flogi reg :failed %s\n",
 741                                       fnic_fcpio_status_to_str(hdr_status));
 742                         fnic->state = FNIC_IN_ETH_MODE;
 743                         ret = -1;
 744                 }
 745         } else {
 746                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 747                               "Unexpected fnic state %s while"
 748                               " processing flogi reg completion\n",
 749                               fnic_state_to_str(fnic->state));
 750                 ret = -1;
 751         }
 752
 753         if (!ret) {
 754                 if (fnic->stop_rx_link_events) {
 755                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 756                         goto reg_cmpl_handler_end;
 757                 }
 758                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 759
 760                 fnic_flush_tx(fnic);
 761                 queue_work(fnic_event_queue, &fnic->frame_work);
 762         } else {
 763                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 764         }
 765
 766 reg_cmpl_handler_end:
 767         return ret;
 768 }
 769
 770 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 771                                         u16 request_out)
 772 {
 773         if (wq->to_clean_index <= wq->to_use_index) {
 774                 /* out of range, stale request_out index */
 775                 if (request_out < wq->to_clean_index ||
 776                     request_out >= wq->to_use_index)
 777                         return 0;
 778         } else {
 779                 /* out of range, stale request_out index */
 780                 if (request_out < wq->to_clean_index &&
 781                     request_out >= wq->to_use_index)
 782                         return 0;
 783         }
 784         /* request_out index is in range */
 785         return 1;
 786 }
 787
 788
 789 /*
 790  * Mark that ack received and store the Ack index. If there are multiple
 791  * acks received before Tx thread cleans it up, the latest value will be
 792  * used which is correct behavior. This state should be in the copy Wq
 793  * instead of in the fnic
 794  */
 795 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 796                                           unsigned int cq_index,
 797                                           struct fcpio_fw_req *desc)
 798 {
 799         struct vnic_wq_copy *wq;
 800         u16 request_out = desc->u.ack.request_out;
 801         unsigned long flags;
 802         u64 *ox_id_tag = (u64 *)(void *)desc;
 803
 804         /* mark the ack state */
 805         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 806         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 807
 808         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 809         if (is_ack_index_in_range(wq, request_out)) {
 810                 fnic->fw_ack_index[0] = request_out;
 811                 fnic->fw_ack_recd[0] = 1;
 812         } else
 813                 atomic64_inc(
 814                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 815
 816         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 817         FNIC_TRACE(fnic_fcpio_ack_handler,
 818                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 819                   ox_id_tag[4], ox_id_tag[5]);
 820 }
 821
 822 /*
 823  * fnic_fcpio_icmnd_cmpl_handler
 824  * Routine to handle icmnd completions
 825  */
 826 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 827                                          struct fcpio_fw_req *desc)
 828 {
 829         u8 type;
 830         u8 hdr_status;
 831         struct fcpio_tag tag;
 832         u32 id;
 833         u64 xfer_len = 0;
 834         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 835         struct fnic_io_req *io_req;
 836         struct scsi_cmnd *sc;
 837         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 838         unsigned long flags;
 839         spinlock_t *io_lock;
 840         u64 cmd_trace;
 841         unsigned long start_time;
 842         unsigned long io_duration_time;
 843
 844         /* Decode the cmpl description to get the io_req id */
 845         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 846         fcpio_tag_id_dec(&tag, &id);
 847         icmnd_cmpl = &desc->u.icmnd_cmpl;
 848
 849         if (id >= fnic->fnic_max_tag_id) {
 850                 shost_printk(KERN_ERR, fnic->lport->host,
 851                         "Tag out of range tag %x hdr status = %s\n",
 852                              id, fnic_fcpio_status_to_str(hdr_status));
 853                 return;
 854         }
 855
 856         sc = scsi_host_find_tag(fnic->lport->host, id);
 857         WARN_ON_ONCE(!sc);
 858         if (!sc) {
 859                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 860                 shost_printk(KERN_ERR, fnic->lport->host,
 861                           "icmnd_cmpl sc is null - "
 862                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 863                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 864                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 865                           fnic->lport->host->host_no, id,
 866                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 867                           (u64)icmnd_cmpl->_resvd0[0]),
 868                           ((u64)hdr_status << 16 |
 869                           (u64)icmnd_cmpl->scsi_status << 8 |
 870                           (u64)icmnd_cmpl->flags), desc,
 871                           (u64)icmnd_cmpl->residual, 0);
 872                 return;
 873         }
 874
 875         io_lock = fnic_io_lock_hash(fnic, sc);
 876         spin_lock_irqsave(io_lock, flags);
 877         io_req = (struct fnic_io_req *)CMD_SP(sc);
 878         WARN_ON_ONCE(!io_req);
 879         if (!io_req) {
 880                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 881                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 882                 spin_unlock_irqrestore(io_lock, flags);
 883                 shost_printk(KERN_ERR, fnic->lport->host,
 884                           "icmnd_cmpl io_req is null - "
 885                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 886                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 887                 return;
 888         }
 889         start_time = io_req->start_time;
 890
 891         /* firmware completed the io */
 892         io_req->io_completed = 1;
 893
 894         /*
 895          *  if SCSI-ML has already issued abort on this command,
 896          *  set completion of the IO. The abts path will clean it up
 897          */
 898         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 899
 900                 /*
 901                  * set the FNIC_IO_DONE so that this doesn't get
 902                  * flagged as 'out of order' if it was not aborted
 903                  */
 904                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 905                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 906                 spin_unlock_irqrestore(io_lock, flags);
 907                 if(FCPIO_ABORTED == hdr_status)
 908                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 909
 910                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 911                         "icmnd_cmpl abts pending "
 912                           "hdr status = %s tag = 0x%x sc = 0x%p"
 913                           "scsi_status = %x residual = %d\n",
 914                           fnic_fcpio_status_to_str(hdr_status),
 915                           id, sc,
 916                           icmnd_cmpl->scsi_status,
 917                           icmnd_cmpl->residual);
 918                 return;
 919         }
 920
 921         /* Mark the IO as complete */
 922         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 923
 924         icmnd_cmpl = &desc->u.icmnd_cmpl;
 925
 926         switch (hdr_status) {
 927         case FCPIO_SUCCESS:
 928                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 929                 xfer_len = scsi_bufflen(sc);
 930                 scsi_set_resid(sc, icmnd_cmpl->residual);
 931
 932                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
 933                         xfer_len -= icmnd_cmpl->residual;
 934
 935                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 936                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 937
 938                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 939                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 940                 break;
 941
 942         case FCPIO_TIMEOUT:          /* request was timed out */
 943                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 944                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 945                 break;
 946
 947         case FCPIO_ABORTED:          /* request was aborted */
 948                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 949                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 950                 break;
 951
 952         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 953                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 954                 scsi_set_resid(sc, icmnd_cmpl->residual);
 955                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 956                 break;
 957
 958         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 959                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 960                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 961                 break;
 962
 963         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 964                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 965                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 966                 break;
 967
 968         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 969                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 970                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 971                 break;
 972
 973         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 974                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 975                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 976                 break;
 977
 978         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 979                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 980                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 981                 break;
 982
 983         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 984         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 985         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 986         default:
 987                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 988                 break;
 989         }
 990
 991         /* Break link with the SCSI command */
 992         CMD_SP(sc) = NULL;
 993         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 994
 995         spin_unlock_irqrestore(io_lock, flags);
 996
 997         if (hdr_status != FCPIO_SUCCESS) {
 998                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 999                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
1000                              fnic_fcpio_status_to_str(hdr_status));
1001         }
1002
1003         fnic_release_ioreq_buf(fnic, io_req, sc);
1004
1005         mempool_free(io_req, fnic->io_req_pool);
1006
1007         cmd_trace = ((u64)hdr_status << 56) |
1008                   (u64)icmnd_cmpl->scsi_status << 48 |
1009                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
1010                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1011                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
1012
1013         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
1014                   sc->device->host->host_no, id, sc,
1015                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
1016                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1017                   jiffies_to_msecs(jiffies - start_time)),
1018                   desc, cmd_trace,
1019                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1020
1021         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1022                 fnic->lport->host_stats.fcp_input_requests++;
1023                 fnic->fcp_input_bytes += xfer_len;
1024         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1025                 fnic->lport->host_stats.fcp_output_requests++;
1026                 fnic->fcp_output_bytes += xfer_len;
1027         } else
1028                 fnic->lport->host_stats.fcp_control_requests++;
1029
1030         atomic64_dec(&fnic_stats->io_stats.active_ios);
1031         if (atomic64_read(&fnic->io_cmpl_skip))
1032                 atomic64_dec(&fnic->io_cmpl_skip);
1033         else
1034                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1035
1036
1037         io_duration_time = jiffies_to_msecs(jiffies) -
1038                                                 jiffies_to_msecs(start_time);
1039
1040         if(io_duration_time <= 10)
1041                 atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
1042         else if(io_duration_time <= 100)
1043                 atomic64_inc(&fnic_stats->io_stats.io_btw_10_to_100_msec);
1044         else if(io_duration_time <= 500)
1045                 atomic64_inc(&fnic_stats->io_stats.io_btw_100_to_500_msec);
1046         else if(io_duration_time <= 5000)
1047                 atomic64_inc(&fnic_stats->io_stats.io_btw_500_to_5000_msec);
1048         else if(io_duration_time <= 10000)
1049                 atomic64_inc(&fnic_stats->io_stats.io_btw_5000_to_10000_msec);
1050         else if(io_duration_time <= 30000)
1051                 atomic64_inc(&fnic_stats->io_stats.io_btw_10000_to_30000_msec);
1052         else {
1053                 atomic64_inc(&fnic_stats->io_stats.io_greater_than_30000_msec);
1054
1055                 if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
1056                         atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
1057         }
1058
1059         /* Call SCSI completion function to complete the IO */
1060         if (sc->scsi_done)
1061                 sc->scsi_done(sc);
1062 }
1063
1064 /* fnic_fcpio_itmf_cmpl_handler
1065  * Routine to handle itmf completions
1066  */
1067 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1068                                         struct fcpio_fw_req *desc)
1069 {
1070         u8 type;
1071         u8 hdr_status;
1072         struct fcpio_tag tag;
1073         u32 id;
1074         struct scsi_cmnd *sc;
1075         struct fnic_io_req *io_req;
1076         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1077         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1078         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1079         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1080         unsigned long flags;
1081         spinlock_t *io_lock;
1082         unsigned long start_time;
1083
1084         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1085         fcpio_tag_id_dec(&tag, &id);
1086
1087         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1088                 shost_printk(KERN_ERR, fnic->lport->host,
1089                 "Tag out of range tag %x hdr status = %s\n",
1090                 id, fnic_fcpio_status_to_str(hdr_status));
1091                 return;
1092         }
1093
1094         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1095         WARN_ON_ONCE(!sc);
1096         if (!sc) {
1097                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1098                 shost_printk(KERN_ERR, fnic->lport->host,
1099                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1100                           fnic_fcpio_status_to_str(hdr_status), id);
1101                 return;
1102         }
1103         io_lock = fnic_io_lock_hash(fnic, sc);
1104         spin_lock_irqsave(io_lock, flags);
1105         io_req = (struct fnic_io_req *)CMD_SP(sc);
1106         WARN_ON_ONCE(!io_req);
1107         if (!io_req) {
1108                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1109                 spin_unlock_irqrestore(io_lock, flags);
1110                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1111                 shost_printk(KERN_ERR, fnic->lport->host,
1112                           "itmf_cmpl io_req is null - "
1113                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1114                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1115                 return;
1116         }
1117         start_time = io_req->start_time;
1118
1119         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1120                 /* Abort and terminate completion of device reset req */
1121                 /* REVISIT : Add asserts about various flags */
1122                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1123                               "dev reset abts cmpl recd. id %x status %s\n",
1124                               id, fnic_fcpio_status_to_str(hdr_status));
1125                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1126                 CMD_ABTS_STATUS(sc) = hdr_status;
1127                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1128                 if (io_req->abts_done)
1129                         complete(io_req->abts_done);
1130                 spin_unlock_irqrestore(io_lock, flags);
1131         } else if (id & FNIC_TAG_ABORT) {
1132                 /* Completion of abort cmd */
1133                 switch (hdr_status) {
1134                 case FCPIO_SUCCESS:
1135                         break;
1136                 case FCPIO_TIMEOUT:
1137                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1138                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1139                         else
1140                                 atomic64_inc(
1141                                         &term_stats->terminate_fw_timeouts);
1142                         break;
1143                 case FCPIO_ITMF_REJECTED:
1144                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1145                                 "abort reject recd. id %d\n",
1146                                 (int)(id & FNIC_TAG_MASK));
1147                         break;
1148                 case FCPIO_IO_NOT_FOUND:
1149                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1150                                 atomic64_inc(&abts_stats->abort_io_not_found);
1151                         else
1152                                 atomic64_inc(
1153                                         &term_stats->terminate_io_not_found);
1154                         break;
1155                 default:
1156                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1157                                 atomic64_inc(&abts_stats->abort_failures);
1158                         else
1159                                 atomic64_inc(
1160                                         &term_stats->terminate_failures);
1161                         break;
1162                 }
1163                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1164                         /* This is a late completion. Ignore it */
1165                         spin_unlock_irqrestore(io_lock, flags);
1166                         return;
1167                 }
1168
1169                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1170                 CMD_ABTS_STATUS(sc) = hdr_status;
1171
1172                 /* If the status is IO not found consider it as success */
1173                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1174                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1175
1176                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1177                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1178
1179                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1180                               "abts cmpl recd. id %d status %s\n",
1181                               (int)(id & FNIC_TAG_MASK),
1182                               fnic_fcpio_status_to_str(hdr_status));
1183
1184                 /*
1185                  * If scsi_eh thread is blocked waiting for abts to complete,
1186                  * signal completion to it. IO will be cleaned in the thread
1187                  * else clean it in this context
1188                  */
1189                 if (io_req->abts_done) {
1190                         complete(io_req->abts_done);
1191                         spin_unlock_irqrestore(io_lock, flags);
1192                 } else {
1193                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1194                                       "abts cmpl, completing IO\n");
1195                         CMD_SP(sc) = NULL;
1196                         sc->result = (DID_ERROR << 16);
1197
1198                         spin_unlock_irqrestore(io_lock, flags);
1199
1200                         fnic_release_ioreq_buf(fnic, io_req, sc);
1201                         mempool_free(io_req, fnic->io_req_pool);
1202                         if (sc->scsi_done) {
1203                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1204                                         sc->device->host->host_no, id,
1205                                         sc,
1206                                         jiffies_to_msecs(jiffies - start_time),
1207                                         desc,
1208                                         (((u64)hdr_status << 40) |
1209                                         (u64)sc->cmnd[0] << 32 |
1210                                         (u64)sc->cmnd[2] << 24 |
1211                                         (u64)sc->cmnd[3] << 16 |
1212                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1213                                         (((u64)CMD_FLAGS(sc) << 32) |
1214                                         CMD_STATE(sc)));
1215                                 sc->scsi_done(sc);
1216                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1217                                 if (atomic64_read(&fnic->io_cmpl_skip))
1218                                         atomic64_dec(&fnic->io_cmpl_skip);
1219                                 else
1220                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1221                         }
1222                 }
1223
1224         } else if (id & FNIC_TAG_DEV_RST) {
1225                 /* Completion of device reset */
1226                 CMD_LR_STATUS(sc) = hdr_status;
1227                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1228                         spin_unlock_irqrestore(io_lock, flags);
1229                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1230                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1231                                   sc->device->host->host_no, id, sc,
1232                                   jiffies_to_msecs(jiffies - start_time),
1233                                   desc, 0,
1234                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1235                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1236                                 "Terminate pending "
1237                                 "dev reset cmpl recd. id %d status %s\n",
1238                                 (int)(id & FNIC_TAG_MASK),
1239                                 fnic_fcpio_status_to_str(hdr_status));
1240                         return;
1241                 }
1242                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1243                         /* Need to wait for terminate completion */
1244                         spin_unlock_irqrestore(io_lock, flags);
1245                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1246                                   sc->device->host->host_no, id, sc,
1247                                   jiffies_to_msecs(jiffies - start_time),
1248                                   desc, 0,
1249                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1250                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1251                                 "dev reset cmpl recd after time out. "
1252                                 "id %d status %s\n",
1253                                 (int)(id & FNIC_TAG_MASK),
1254                                 fnic_fcpio_status_to_str(hdr_status));
1255                         return;
1256                 }
1257                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1258                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1259                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1260                               "dev reset cmpl recd. id %d status %s\n",
1261                               (int)(id & FNIC_TAG_MASK),
1262                               fnic_fcpio_status_to_str(hdr_status));
1263                 if (io_req->dr_done)
1264                         complete(io_req->dr_done);
1265                 spin_unlock_irqrestore(io_lock, flags);
1266
1267         } else {
1268                 shost_printk(KERN_ERR, fnic->lport->host,
1269                              "Unexpected itmf io state %s tag %x\n",
1270                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1271                 spin_unlock_irqrestore(io_lock, flags);
1272         }
1273
1274 }
1275
1276 /*
1277  * fnic_fcpio_cmpl_handler
1278  * Routine to service the cq for wq_copy
1279  */
1280 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1281                                    unsigned int cq_index,
1282                                    struct fcpio_fw_req *desc)
1283 {
1284         struct fnic *fnic = vnic_dev_priv(vdev);
1285
1286         switch (desc->hdr.type) {
1287         case FCPIO_ICMND_CMPL: /* fw completed a command */
1288         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1289         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1290         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1291         case FCPIO_RESET_CMPL: /* fw completed reset */
1292                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1293                 break;
1294         default:
1295                 break;
1296         }
1297
1298         switch (desc->hdr.type) {
1299         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1300                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1301                 break;
1302
1303         case FCPIO_ICMND_CMPL: /* fw completed a command */
1304                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1305                 break;
1306
1307         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1308                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1309                 break;
1310
1311         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1312         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1313                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1314                 break;
1315
1316         case FCPIO_RESET_CMPL: /* fw completed reset */
1317                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1318                 break;
1319
1320         default:
1321                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1322                               "firmware completion type %d\n",
1323                               desc->hdr.type);
1324                 break;
1325         }
1326
1327         return 0;
1328 }
1329
1330 /*
1331  * fnic_wq_copy_cmpl_handler
1332  * Routine to process wq copy
1333  */
1334 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1335 {
1336         unsigned int wq_work_done = 0;
1337         unsigned int i, cq_index;
1338         unsigned int cur_work_done;
1339
1340         for (i = 0; i < fnic->wq_copy_count; i++) {
1341                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1342                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1343                                                      fnic_fcpio_cmpl_handler,
1344                                                      copy_work_to_do);
1345                 wq_work_done += cur_work_done;
1346         }
1347         return wq_work_done;
1348 }
1349
1350 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1351 {
1352         int i;
1353         struct fnic_io_req *io_req;
1354         unsigned long flags = 0;
1355         struct scsi_cmnd *sc;
1356         spinlock_t *io_lock;
1357         unsigned long start_time = 0;
1358         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1359
1360         for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1361                 if (i == exclude_id)
1362                         continue;
1363
1364                 io_lock = fnic_io_lock_tag(fnic, i);
1365                 spin_lock_irqsave(io_lock, flags);
1366                 sc = scsi_host_find_tag(fnic->lport->host, i);
1367                 if (!sc) {
1368                         spin_unlock_irqrestore(io_lock, flags);
1369                         continue;
1370                 }
1371
1372                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1373                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1374                         !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1375                         /*
1376                          * We will be here only when FW completes reset
1377                          * without sending completions for outstanding ios.
1378                          */
1379                         CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1380                         if (io_req && io_req->dr_done)
1381                                 complete(io_req->dr_done);
1382                         else if (io_req && io_req->abts_done)
1383                                 complete(io_req->abts_done);
1384                         spin_unlock_irqrestore(io_lock, flags);
1385                         continue;
1386                 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1387                         spin_unlock_irqrestore(io_lock, flags);
1388                         continue;
1389                 }
1390                 if (!io_req) {
1391                         spin_unlock_irqrestore(io_lock, flags);
1392                         goto cleanup_scsi_cmd;
1393                 }
1394
1395                 CMD_SP(sc) = NULL;
1396
1397                 spin_unlock_irqrestore(io_lock, flags);
1398
1399                 /*
1400                  * If there is a scsi_cmnd associated with this io_req, then
1401                  * free the corresponding state
1402                  */
1403                 start_time = io_req->start_time;
1404                 fnic_release_ioreq_buf(fnic, io_req, sc);
1405                 mempool_free(io_req, fnic->io_req_pool);
1406
1407 cleanup_scsi_cmd:
1408                 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1409                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1410                               "%s: sc duration = %lu DID_TRANSPORT_DISRUPTED\n",
1411                               __func__, (jiffies - start_time));
1412
1413                 if (atomic64_read(&fnic->io_cmpl_skip))
1414                         atomic64_dec(&fnic->io_cmpl_skip);
1415                 else
1416                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1417
1418                 /* Complete the command to SCSI */
1419                 if (sc->scsi_done) {
1420                         FNIC_TRACE(fnic_cleanup_io,
1421                                   sc->device->host->host_no, i, sc,
1422                                   jiffies_to_msecs(jiffies - start_time),
1423                                   0, ((u64)sc->cmnd[0] << 32 |
1424                                   (u64)sc->cmnd[2] << 24 |
1425                                   (u64)sc->cmnd[3] << 16 |
1426                                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1427                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1428
1429                         sc->scsi_done(sc);
1430                 }
1431         }
1432 }
1433
1434 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1435                                   struct fcpio_host_req *desc)
1436 {
1437         u32 id;
1438         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1439         struct fnic_io_req *io_req;
1440         struct scsi_cmnd *sc;
1441         unsigned long flags;
1442         spinlock_t *io_lock;
1443         unsigned long start_time = 0;
1444
1445         /* get the tag reference */
1446         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1447         id &= FNIC_TAG_MASK;
1448
1449         if (id >= fnic->fnic_max_tag_id)
1450                 return;
1451
1452         sc = scsi_host_find_tag(fnic->lport->host, id);
1453         if (!sc)
1454                 return;
1455
1456         io_lock = fnic_io_lock_hash(fnic, sc);
1457         spin_lock_irqsave(io_lock, flags);
1458
1459         /* Get the IO context which this desc refers to */
1460         io_req = (struct fnic_io_req *)CMD_SP(sc);
1461
1462         /* fnic interrupts are turned off by now */
1463
1464         if (!io_req) {
1465                 spin_unlock_irqrestore(io_lock, flags);
1466                 goto wq_copy_cleanup_scsi_cmd;
1467         }
1468
1469         CMD_SP(sc) = NULL;
1470
1471         spin_unlock_irqrestore(io_lock, flags);
1472
1473         start_time = io_req->start_time;
1474         fnic_release_ioreq_buf(fnic, io_req, sc);
1475         mempool_free(io_req, fnic->io_req_pool);
1476
1477 wq_copy_cleanup_scsi_cmd:
1478         sc->result = DID_NO_CONNECT << 16;
1479         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1480                       " DID_NO_CONNECT\n");
1481
1482         if (sc->scsi_done) {
1483                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1484                           sc->device->host->host_no, id, sc,
1485                           jiffies_to_msecs(jiffies - start_time),
1486                           0, ((u64)sc->cmnd[0] << 32 |
1487                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1488                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1489                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1490
1491                 sc->scsi_done(sc);
1492         }
1493 }
1494
1495 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1496                                           u32 task_req, u8 *fc_lun,
1497                                           struct fnic_io_req *io_req)
1498 {
1499         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1500         struct Scsi_Host *host = fnic->lport->host;
1501         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1502         unsigned long flags;
1503
1504         spin_lock_irqsave(host->host_lock, flags);
1505         if (unlikely(fnic_chk_state_flags_locked(fnic,
1506                                                 FNIC_FLAGS_IO_BLOCKED))) {
1507                 spin_unlock_irqrestore(host->host_lock, flags);
1508                 return 1;
1509         } else
1510                 atomic_inc(&fnic->in_flight);
1511         spin_unlock_irqrestore(host->host_lock, flags);
1512
1513         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1514
1515         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1516                 free_wq_copy_descs(fnic, wq);
1517
1518         if (!vnic_wq_copy_desc_avail(wq)) {
1519                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1520                 atomic_dec(&fnic->in_flight);
1521                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1522                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1523                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1524                 return 1;
1525         }
1526         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1527                                      0, task_req, tag, fc_lun, io_req->port_id,
1528                                      fnic->config.ra_tov, fnic->config.ed_tov);
1529
1530         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1531         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1532                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1533                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1534                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1535
1536         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1537         atomic_dec(&fnic->in_flight);
1538
1539         return 0;
1540 }
1541
1542 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1543 {
1544         int tag;
1545         int abt_tag;
1546         int term_cnt = 0;
1547         struct fnic_io_req *io_req;
1548         spinlock_t *io_lock;
1549         unsigned long flags;
1550         struct scsi_cmnd *sc;
1551         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1552         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1553         struct scsi_lun fc_lun;
1554         enum fnic_ioreq_state old_ioreq_state;
1555
1556         FNIC_SCSI_DBG(KERN_DEBUG,
1557                       fnic->lport->host,
1558                       "fnic_rport_exch_reset called portid 0x%06x\n",
1559                       port_id);
1560
1561         if (fnic->in_remove)
1562                 return;
1563
1564         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1565                 abt_tag = tag;
1566                 io_lock = fnic_io_lock_tag(fnic, tag);
1567                 spin_lock_irqsave(io_lock, flags);
1568                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1569                 if (!sc) {
1570                         spin_unlock_irqrestore(io_lock, flags);
1571                         continue;
1572                 }
1573
1574                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1575
1576                 if (!io_req || io_req->port_id != port_id) {
1577                         spin_unlock_irqrestore(io_lock, flags);
1578                         continue;
1579                 }
1580
1581                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1582                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1583                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1584                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1585                         sc);
1586                         spin_unlock_irqrestore(io_lock, flags);
1587                         continue;
1588                 }
1589
1590                 /*
1591                  * Found IO that is still pending with firmware and
1592                  * belongs to rport that went away
1593                  */
1594                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1595                         spin_unlock_irqrestore(io_lock, flags);
1596                         continue;
1597                 }
1598                 if (io_req->abts_done) {
1599                         shost_printk(KERN_ERR, fnic->lport->host,
1600                         "fnic_rport_exch_reset: io_req->abts_done is set "
1601                         "state is %s\n",
1602                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1603                 }
1604
1605                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1606                         shost_printk(KERN_ERR, fnic->lport->host,
1607                                   "rport_exch_reset "
1608                                   "IO not yet issued %p tag 0x%x flags "
1609                                   "%x state %d\n",
1610                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1611                 }
1612                 old_ioreq_state = CMD_STATE(sc);
1613                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1614                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1615                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1616                         atomic64_inc(&reset_stats->device_reset_terminates);
1617                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1618                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1619                         "fnic_rport_exch_reset dev rst sc 0x%p\n",
1620                         sc);
1621                 }
1622
1623                 BUG_ON(io_req->abts_done);
1624
1625                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1626                               "fnic_rport_reset_exch: Issuing abts\n");
1627
1628                 spin_unlock_irqrestore(io_lock, flags);
1629
1630                 /* Now queue the abort command to firmware */
1631                 int_to_scsilun(sc->device->lun, &fc_lun);
1632
1633                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1634                                             FCPIO_ITMF_ABT_TASK_TERM,
1635                                             fc_lun.scsi_lun, io_req)) {
1636                         /*
1637                          * Revert the cmd state back to old state, if
1638                          * it hasn't changed in between. This cmd will get
1639                          * aborted later by scsi_eh, or cleaned up during
1640                          * lun reset
1641                          */
1642                         spin_lock_irqsave(io_lock, flags);
1643                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1644                                 CMD_STATE(sc) = old_ioreq_state;
1645                         spin_unlock_irqrestore(io_lock, flags);
1646                 } else {
1647                         spin_lock_irqsave(io_lock, flags);
1648                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1649                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1650                         else
1651                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1652                         spin_unlock_irqrestore(io_lock, flags);
1653                         atomic64_inc(&term_stats->terminates);
1654                         term_cnt++;
1655                 }
1656         }
1657         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1658                 atomic64_set(&term_stats->max_terminates, term_cnt);
1659
1660 }
1661
1662 void fnic_terminate_rport_io(struct fc_rport *rport)
1663 {
1664         int tag;
1665         int abt_tag;
1666         int term_cnt = 0;
1667         struct fnic_io_req *io_req;
1668         spinlock_t *io_lock;
1669         unsigned long flags;
1670         struct scsi_cmnd *sc;
1671         struct scsi_lun fc_lun;
1672         struct fc_rport_libfc_priv *rdata;
1673         struct fc_lport *lport;
1674         struct fnic *fnic;
1675         struct fc_rport *cmd_rport;
1676         struct reset_stats *reset_stats;
1677         struct terminate_stats *term_stats;
1678         enum fnic_ioreq_state old_ioreq_state;
1679
1680         if (!rport) {
1681                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1682                 return;
1683         }
1684         rdata = rport->dd_data;
1685
1686         if (!rdata) {
1687                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1688                 return;
1689         }
1690         lport = rdata->local_port;
1691
1692         if (!lport) {
1693                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1694                 return;
1695         }
1696         fnic = lport_priv(lport);
1697         FNIC_SCSI_DBG(KERN_DEBUG,
1698                       fnic->lport->host, "fnic_terminate_rport_io called"
1699                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1700                       rport->port_name, rport->node_name, rport,
1701                       rport->port_id);
1702
1703         if (fnic->in_remove)
1704                 return;
1705
1706         reset_stats = &fnic->fnic_stats.reset_stats;
1707         term_stats = &fnic->fnic_stats.term_stats;
1708
1709         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1710                 abt_tag = tag;
1711                 io_lock = fnic_io_lock_tag(fnic, tag);
1712                 spin_lock_irqsave(io_lock, flags);
1713                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1714                 if (!sc) {
1715                         spin_unlock_irqrestore(io_lock, flags);
1716                         continue;
1717                 }
1718
1719                 cmd_rport = starget_to_rport(scsi_target(sc->device));
1720                 if (rport != cmd_rport) {
1721                         spin_unlock_irqrestore(io_lock, flags);
1722                         continue;
1723                 }
1724
1725                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1726
1727                 if (!io_req || rport != cmd_rport) {
1728                         spin_unlock_irqrestore(io_lock, flags);
1729                         continue;
1730                 }
1731
1732                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1733                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1734                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1735                         "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1736                         sc);
1737                         spin_unlock_irqrestore(io_lock, flags);
1738                         continue;
1739                 }
1740                 /*
1741                  * Found IO that is still pending with firmware and
1742                  * belongs to rport that went away
1743                  */
1744                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1745                         spin_unlock_irqrestore(io_lock, flags);
1746                         continue;
1747                 }
1748                 if (io_req->abts_done) {
1749                         shost_printk(KERN_ERR, fnic->lport->host,
1750                         "fnic_terminate_rport_io: io_req->abts_done is set "
1751                         "state is %s\n",
1752                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1753                 }
1754                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1755                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1756                                   "fnic_terminate_rport_io "
1757                                   "IO not yet issued %p tag 0x%x flags "
1758                                   "%x state %d\n",
1759                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1760                 }
1761                 old_ioreq_state = CMD_STATE(sc);
1762                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1763                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1764                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1765                         atomic64_inc(&reset_stats->device_reset_terminates);
1766                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1767                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1768                         "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1769                 }
1770
1771                 BUG_ON(io_req->abts_done);
1772
1773                 FNIC_SCSI_DBG(KERN_DEBUG,
1774                               fnic->lport->host,
1775                               "fnic_terminate_rport_io: Issuing abts\n");
1776
1777                 spin_unlock_irqrestore(io_lock, flags);
1778
1779                 /* Now queue the abort command to firmware */
1780                 int_to_scsilun(sc->device->lun, &fc_lun);
1781
1782                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1783                                             FCPIO_ITMF_ABT_TASK_TERM,
1784                                             fc_lun.scsi_lun, io_req)) {
1785                         /*
1786                          * Revert the cmd state back to old state, if
1787                          * it hasn't changed in between. This cmd will get
1788                          * aborted later by scsi_eh, or cleaned up during
1789                          * lun reset
1790                          */
1791                         spin_lock_irqsave(io_lock, flags);
1792                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1793                                 CMD_STATE(sc) = old_ioreq_state;
1794                         spin_unlock_irqrestore(io_lock, flags);
1795                 } else {
1796                         spin_lock_irqsave(io_lock, flags);
1797                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1798                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1799                         else
1800                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1801                         spin_unlock_irqrestore(io_lock, flags);
1802                         atomic64_inc(&term_stats->terminates);
1803                         term_cnt++;
1804                 }
1805         }
1806         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1807                 atomic64_set(&term_stats->max_terminates, term_cnt);
1808
1809 }
1810
1811 /*
1812  * This function is exported to SCSI for sending abort cmnds.
1813  * A SCSI IO is represented by a io_req in the driver.
1814  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1815  */
1816 int fnic_abort_cmd(struct scsi_cmnd *sc)
1817 {
1818         struct fc_lport *lp;
1819         struct fnic *fnic;
1820         struct fnic_io_req *io_req = NULL;
1821         struct fc_rport *rport;
1822         spinlock_t *io_lock;
1823         unsigned long flags;
1824         unsigned long start_time = 0;
1825         int ret = SUCCESS;
1826         u32 task_req = 0;
1827         struct scsi_lun fc_lun;
1828         struct fnic_stats *fnic_stats;
1829         struct abort_stats *abts_stats;
1830         struct terminate_stats *term_stats;
1831         enum fnic_ioreq_state old_ioreq_state;
1832         int tag;
1833         unsigned long abt_issued_time;
1834         DECLARE_COMPLETION_ONSTACK(tm_done);
1835
1836         /* Wait for rport to unblock */
1837         fc_block_scsi_eh(sc);
1838
1839         /* Get local-port, check ready and link up */
1840         lp = shost_priv(sc->device->host);
1841
1842         fnic = lport_priv(lp);
1843         fnic_stats = &fnic->fnic_stats;
1844         abts_stats = &fnic->fnic_stats.abts_stats;
1845         term_stats = &fnic->fnic_stats.term_stats;
1846
1847         rport = starget_to_rport(scsi_target(sc->device));
1848         tag = sc->request->tag;
1849         FNIC_SCSI_DBG(KERN_DEBUG,
1850                 fnic->lport->host,
1851                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1852                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1853
1854         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1855
1856         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1857                 ret = FAILED;
1858                 goto fnic_abort_cmd_end;
1859         }
1860
1861         /*
1862          * Avoid a race between SCSI issuing the abort and the device
1863          * completing the command.
1864          *
1865          * If the command is already completed by the fw cmpl code,
1866          * we just return SUCCESS from here. This means that the abort
1867          * succeeded. In the SCSI ML, since the timeout for command has
1868          * happened, the completion wont actually complete the command
1869          * and it will be considered as an aborted command
1870          *
1871          * The CMD_SP will not be cleared except while holding io_req_lock.
1872          */
1873         io_lock = fnic_io_lock_hash(fnic, sc);
1874         spin_lock_irqsave(io_lock, flags);
1875         io_req = (struct fnic_io_req *)CMD_SP(sc);
1876         if (!io_req) {
1877                 spin_unlock_irqrestore(io_lock, flags);
1878                 goto fnic_abort_cmd_end;
1879         }
1880
1881         io_req->abts_done = &tm_done;
1882
1883         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1884                 spin_unlock_irqrestore(io_lock, flags);
1885                 goto wait_pending;
1886         }
1887
1888         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1889         if (abt_issued_time <= 6000)
1890                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1891         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1892                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1893         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1894                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1895         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1896                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1897         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1898                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1899         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1900                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1901         else
1902                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1903
1904         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1905                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1906         /*
1907          * Command is still pending, need to abort it
1908          * If the firmware completes the command after this point,
1909          * the completion wont be done till mid-layer, since abort
1910          * has already started.
1911          */
1912         old_ioreq_state = CMD_STATE(sc);
1913         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1914         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1915
1916         spin_unlock_irqrestore(io_lock, flags);
1917
1918         /*
1919          * Check readiness of the remote port. If the path to remote
1920          * port is up, then send abts to the remote port to terminate
1921          * the IO. Else, just locally terminate the IO in the firmware
1922          */
1923         if (fc_remote_port_chkready(rport) == 0)
1924                 task_req = FCPIO_ITMF_ABT_TASK;
1925         else {
1926                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1927                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1928         }
1929
1930         /* Now queue the abort command to firmware */
1931         int_to_scsilun(sc->device->lun, &fc_lun);
1932
1933         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1934                                     fc_lun.scsi_lun, io_req)) {
1935                 spin_lock_irqsave(io_lock, flags);
1936                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1937                         CMD_STATE(sc) = old_ioreq_state;
1938                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1939                 if (io_req)
1940                         io_req->abts_done = NULL;
1941                 spin_unlock_irqrestore(io_lock, flags);
1942                 ret = FAILED;
1943                 goto fnic_abort_cmd_end;
1944         }
1945         if (task_req == FCPIO_ITMF_ABT_TASK) {
1946                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1947                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1948         } else {
1949                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1950                 atomic64_inc(&fnic_stats->term_stats.terminates);
1951         }
1952
1953         /*
1954          * We queued an abort IO, wait for its completion.
1955          * Once the firmware completes the abort command, it will
1956          * wake up this thread.
1957          */
1958  wait_pending:
1959         wait_for_completion_timeout(&tm_done,
1960                                     msecs_to_jiffies
1961                                     (2 * fnic->config.ra_tov +
1962                                      fnic->config.ed_tov));
1963
1964         /* Check the abort status */
1965         spin_lock_irqsave(io_lock, flags);
1966
1967         io_req = (struct fnic_io_req *)CMD_SP(sc);
1968         if (!io_req) {
1969                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1970                 spin_unlock_irqrestore(io_lock, flags);
1971                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1972                 ret = FAILED;
1973                 goto fnic_abort_cmd_end;
1974         }
1975         io_req->abts_done = NULL;
1976
1977         /* fw did not complete abort, timed out */
1978         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1979                 spin_unlock_irqrestore(io_lock, flags);
1980                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1981                         atomic64_inc(&abts_stats->abort_drv_timeouts);
1982                 } else {
1983                         atomic64_inc(&term_stats->terminate_drv_timeouts);
1984                 }
1985                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
1986                 ret = FAILED;
1987                 goto fnic_abort_cmd_end;
1988         }
1989
1990         /* IO out of order */
1991
1992         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
1993                 spin_unlock_irqrestore(io_lock, flags);
1994                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1995                         "Issuing Host reset due to out of order IO\n");
1996
1997                 ret = FAILED;
1998                 goto fnic_abort_cmd_end;
1999         }
2000
2001         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2002
2003         start_time = io_req->start_time;
2004         /*
2005          * firmware completed the abort, check the status,
2006          * free the io_req if successful. If abort fails,
2007          * Device reset will clean the I/O.
2008          */
2009         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
2010                 CMD_SP(sc) = NULL;
2011         else {
2012                 ret = FAILED;
2013                 spin_unlock_irqrestore(io_lock, flags);
2014                 goto fnic_abort_cmd_end;
2015         }
2016
2017         spin_unlock_irqrestore(io_lock, flags);
2018
2019         fnic_release_ioreq_buf(fnic, io_req, sc);
2020         mempool_free(io_req, fnic->io_req_pool);
2021
2022         if (sc->scsi_done) {
2023         /* Call SCSI completion function to complete the IO */
2024                 sc->result = (DID_ABORT << 16);
2025                 sc->scsi_done(sc);
2026                 atomic64_dec(&fnic_stats->io_stats.active_ios);
2027                 if (atomic64_read(&fnic->io_cmpl_skip))
2028                         atomic64_dec(&fnic->io_cmpl_skip);
2029                 else
2030                         atomic64_inc(&fnic_stats->io_stats.io_completions);
2031         }
2032
2033 fnic_abort_cmd_end:
2034         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
2035                   sc->request->tag, sc,
2036                   jiffies_to_msecs(jiffies - start_time),
2037                   0, ((u64)sc->cmnd[0] << 32 |
2038                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2039                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2040                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2041
2042         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2043                       "Returning from abort cmd type %x %s\n", task_req,
2044                       (ret == SUCCESS) ?
2045                       "SUCCESS" : "FAILED");
2046         return ret;
2047 }
2048
2049 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
2050                                        struct scsi_cmnd *sc,
2051                                        struct fnic_io_req *io_req)
2052 {
2053         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
2054         struct Scsi_Host *host = fnic->lport->host;
2055         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
2056         struct scsi_lun fc_lun;
2057         int ret = 0;
2058         unsigned long intr_flags;
2059
2060         spin_lock_irqsave(host->host_lock, intr_flags);
2061         if (unlikely(fnic_chk_state_flags_locked(fnic,
2062                                                 FNIC_FLAGS_IO_BLOCKED))) {
2063                 spin_unlock_irqrestore(host->host_lock, intr_flags);
2064                 return FAILED;
2065         } else
2066                 atomic_inc(&fnic->in_flight);
2067         spin_unlock_irqrestore(host->host_lock, intr_flags);
2068
2069         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2070
2071         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2072                 free_wq_copy_descs(fnic, wq);
2073
2074         if (!vnic_wq_copy_desc_avail(wq)) {
2075                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2076                           "queue_dr_io_req failure - no descriptors\n");
2077                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2078                 ret = -EAGAIN;
2079                 goto lr_io_req_end;
2080         }
2081
2082         /* fill in the lun info */
2083         int_to_scsilun(sc->device->lun, &fc_lun);
2084
2085         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2086                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2087                                      fc_lun.scsi_lun, io_req->port_id,
2088                                      fnic->config.ra_tov, fnic->config.ed_tov);
2089
2090         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2091         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2092                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2093                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2094                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2095
2096 lr_io_req_end:
2097         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2098         atomic_dec(&fnic->in_flight);
2099
2100         return ret;
2101 }
2102
2103 /*
2104  * Clean up any pending aborts on the lun
2105  * For each outstanding IO on this lun, whose abort is not completed by fw,
2106  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2107  * successfully aborted, 1 otherwise
2108  */
2109 static int fnic_clean_pending_aborts(struct fnic *fnic,
2110                                      struct scsi_cmnd *lr_sc,
2111                                          bool new_sc)
2112
2113 {
2114         int tag, abt_tag;
2115         struct fnic_io_req *io_req;
2116         spinlock_t *io_lock;
2117         unsigned long flags;
2118         int ret = 0;
2119         struct scsi_cmnd *sc;
2120         struct scsi_lun fc_lun;
2121         struct scsi_device *lun_dev = lr_sc->device;
2122         DECLARE_COMPLETION_ONSTACK(tm_done);
2123         enum fnic_ioreq_state old_ioreq_state;
2124
2125         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2126                 io_lock = fnic_io_lock_tag(fnic, tag);
2127                 spin_lock_irqsave(io_lock, flags);
2128                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2129                 /*
2130                  * ignore this lun reset cmd if issued using new SC
2131                  * or cmds that do not belong to this lun
2132                  */
2133                 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2134                         spin_unlock_irqrestore(io_lock, flags);
2135                         continue;
2136                 }
2137
2138                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2139
2140                 if (!io_req || sc->device != lun_dev) {
2141                         spin_unlock_irqrestore(io_lock, flags);
2142                         continue;
2143                 }
2144
2145                 /*
2146                  * Found IO that is still pending with firmware and
2147                  * belongs to the LUN that we are resetting
2148                  */
2149                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2150                               "Found IO in %s on lun\n",
2151                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2152
2153                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2154                         spin_unlock_irqrestore(io_lock, flags);
2155                         continue;
2156                 }
2157                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2158                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2159                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2160                                 "%s dev rst not pending sc 0x%p\n", __func__,
2161                                 sc);
2162                         spin_unlock_irqrestore(io_lock, flags);
2163                         continue;
2164                 }
2165
2166                 if (io_req->abts_done)
2167                         shost_printk(KERN_ERR, fnic->lport->host,
2168                           "%s: io_req->abts_done is set state is %s\n",
2169                           __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2170                 old_ioreq_state = CMD_STATE(sc);
2171                 /*
2172                  * Any pending IO issued prior to reset is expected to be
2173                  * in abts pending state, if not we need to set
2174                  * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2175                  * When IO is completed, the IO will be handed over and
2176                  * handled in this function.
2177                  */
2178                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2179
2180                 BUG_ON(io_req->abts_done);
2181
2182                 abt_tag = tag;
2183                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2184                         abt_tag |= FNIC_TAG_DEV_RST;
2185                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2186                                   "%s: dev rst sc 0x%p\n", __func__, sc);
2187                 }
2188
2189                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2190                 io_req->abts_done = &tm_done;
2191                 spin_unlock_irqrestore(io_lock, flags);
2192
2193                 /* Now queue the abort command to firmware */
2194                 int_to_scsilun(sc->device->lun, &fc_lun);
2195
2196                 if (fnic_queue_abort_io_req(fnic, abt_tag,
2197                                             FCPIO_ITMF_ABT_TASK_TERM,
2198                                             fc_lun.scsi_lun, io_req)) {
2199                         spin_lock_irqsave(io_lock, flags);
2200                         io_req = (struct fnic_io_req *)CMD_SP(sc);
2201                         if (io_req)
2202                                 io_req->abts_done = NULL;
2203                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2204                                 CMD_STATE(sc) = old_ioreq_state;
2205                         spin_unlock_irqrestore(io_lock, flags);
2206                         ret = 1;
2207                         goto clean_pending_aborts_end;
2208                 } else {
2209                         spin_lock_irqsave(io_lock, flags);
2210                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2211                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2212                         spin_unlock_irqrestore(io_lock, flags);
2213                 }
2214                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2215
2216                 wait_for_completion_timeout(&tm_done,
2217                                             msecs_to_jiffies
2218                                             (fnic->config.ed_tov));
2219
2220                 /* Recheck cmd state to check if it is now aborted */
2221                 spin_lock_irqsave(io_lock, flags);
2222                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2223                 if (!io_req) {
2224                         spin_unlock_irqrestore(io_lock, flags);
2225                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2226                         continue;
2227                 }
2228
2229                 io_req->abts_done = NULL;
2230
2231                 /* if abort is still pending with fw, fail */
2232                 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2233                         spin_unlock_irqrestore(io_lock, flags);
2234                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2235                         ret = 1;
2236                         goto clean_pending_aborts_end;
2237                 }
2238                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2239
2240                 /* original sc used for lr is handled by dev reset code */
2241                 if (sc != lr_sc)
2242                         CMD_SP(sc) = NULL;
2243                 spin_unlock_irqrestore(io_lock, flags);
2244
2245                 /* original sc used for lr is handled by dev reset code */
2246                 if (sc != lr_sc) {
2247                         fnic_release_ioreq_buf(fnic, io_req, sc);
2248                         mempool_free(io_req, fnic->io_req_pool);
2249                 }
2250
2251                 /*
2252                  * Any IO is returned during reset, it needs to call scsi_done
2253                  * to return the scsi_cmnd to upper layer.
2254                  */
2255                 if (sc->scsi_done) {
2256                         /* Set result to let upper SCSI layer retry */
2257                         sc->result = DID_RESET << 16;
2258                         sc->scsi_done(sc);
2259                 }
2260         }
2261
2262         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2263
2264         /* walk again to check, if IOs are still pending in fw */
2265         if (fnic_is_abts_pending(fnic, lr_sc))
2266                 ret = FAILED;
2267
2268 clean_pending_aborts_end:
2269         return ret;
2270 }
2271
2272 /**
2273  * fnic_scsi_host_start_tag
2274  * Allocates tagid from host's tag list
2275  **/
2276 static inline int
2277 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2278 {
2279         struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2280         int tag, ret = SCSI_NO_TAG;
2281
2282         BUG_ON(!bqt);
2283         if (!bqt) {
2284                 pr_err("Tags are not supported\n");
2285                 goto end;
2286         }
2287
2288         do {
2289                 tag = find_next_zero_bit(bqt->tag_map, bqt->max_depth, 1);
2290                 if (tag >= bqt->max_depth) {
2291                         pr_err("Tag allocation failure\n");
2292                         goto end;
2293                 }
2294         } while (test_and_set_bit(tag, bqt->tag_map));
2295
2296         bqt->tag_index[tag] = sc->request;
2297         sc->request->tag = tag;
2298         sc->tag = tag;
2299         if (!sc->request->special)
2300                 sc->request->special = sc;
2301
2302         ret = tag;
2303
2304 end:
2305         return ret;
2306 }
2307
2308 /**
2309  * fnic_scsi_host_end_tag
2310  * frees tag allocated by fnic_scsi_host_start_tag.
2311  **/
2312 static inline void
2313 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2314 {
2315         struct blk_queue_tag *bqt = fnic->lport->host->bqt;
2316         int tag = sc->request->tag;
2317
2318         if (tag == SCSI_NO_TAG)
2319                 return;
2320
2321         BUG_ON(!bqt || !bqt->tag_index[tag]);
2322         if (!bqt)
2323                 return;
2324
2325         bqt->tag_index[tag] = NULL;
2326         clear_bit(tag, bqt->tag_map);
2327
2328         return;
2329 }
2330
2331 /*
2332  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2333  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2334  * on the LUN.
2335  */
2336 int fnic_device_reset(struct scsi_cmnd *sc)
2337 {
2338         struct fc_lport *lp;
2339         struct fnic *fnic;
2340         struct fnic_io_req *io_req = NULL;
2341         struct fc_rport *rport;
2342         int status;
2343         int ret = FAILED;
2344         spinlock_t *io_lock;
2345         unsigned long flags;
2346         unsigned long start_time = 0;
2347         struct scsi_lun fc_lun;
2348         struct fnic_stats *fnic_stats;
2349         struct reset_stats *reset_stats;
2350         int tag = 0;
2351         DECLARE_COMPLETION_ONSTACK(tm_done);
2352         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2353         bool new_sc = 0;
2354
2355         /* Wait for rport to unblock */
2356         fc_block_scsi_eh(sc);
2357
2358         /* Get local-port, check ready and link up */
2359         lp = shost_priv(sc->device->host);
2360
2361         fnic = lport_priv(lp);
2362         fnic_stats = &fnic->fnic_stats;
2363         reset_stats = &fnic->fnic_stats.reset_stats;
2364
2365         atomic64_inc(&reset_stats->device_resets);
2366
2367         rport = starget_to_rport(scsi_target(sc->device));
2368         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2369                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2370                       rport->port_id, sc->device->lun, sc);
2371
2372         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2373                 goto fnic_device_reset_end;
2374
2375         /* Check if remote port up */
2376         if (fc_remote_port_chkready(rport)) {
2377                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2378                 goto fnic_device_reset_end;
2379         }
2380
2381         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2382         /* Allocate tag if not present */
2383
2384         tag = sc->request->tag;
2385         if (unlikely(tag < 0)) {
2386                 /*
2387                  * XXX(hch): current the midlayer fakes up a struct
2388                  * request for the explicit reset ioctls, and those
2389                  * don't have a tag allocated to them.  The below
2390                  * code pokes into midlayer structures to paper over
2391                  * this design issue, but that won't work for blk-mq.
2392                  *
2393                  * Either someone who can actually test the hardware
2394                  * will have to come up with a similar hack for the
2395                  * blk-mq case, or we'll have to bite the bullet and
2396                  * fix the way the EH ioctls work for real, but until
2397                  * that happens we fail these explicit requests here.
2398                  */
2399
2400                 tag = fnic_scsi_host_start_tag(fnic, sc);
2401                 if (unlikely(tag == SCSI_NO_TAG))
2402                         goto fnic_device_reset_end;
2403                 tag_gen_flag = 1;
2404                 new_sc = 1;
2405         }
2406         io_lock = fnic_io_lock_hash(fnic, sc);
2407         spin_lock_irqsave(io_lock, flags);
2408         io_req = (struct fnic_io_req *)CMD_SP(sc);
2409
2410         /*
2411          * If there is a io_req attached to this command, then use it,
2412          * else allocate a new one.
2413          */
2414         if (!io_req) {
2415                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2416                 if (!io_req) {
2417                         spin_unlock_irqrestore(io_lock, flags);
2418                         goto fnic_device_reset_end;
2419                 }
2420                 memset(io_req, 0, sizeof(*io_req));
2421                 io_req->port_id = rport->port_id;
2422                 CMD_SP(sc) = (char *)io_req;
2423         }
2424         io_req->dr_done = &tm_done;
2425         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2426         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2427         spin_unlock_irqrestore(io_lock, flags);
2428
2429         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2430
2431         /*
2432          * issue the device reset, if enqueue failed, clean up the ioreq
2433          * and break assoc with scsi cmd
2434          */
2435         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2436                 spin_lock_irqsave(io_lock, flags);
2437                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2438                 if (io_req)
2439                         io_req->dr_done = NULL;
2440                 goto fnic_device_reset_clean;
2441         }
2442         spin_lock_irqsave(io_lock, flags);
2443         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2444         spin_unlock_irqrestore(io_lock, flags);
2445
2446         /*
2447          * Wait on the local completion for LUN reset.  The io_req may be
2448          * freed while we wait since we hold no lock.
2449          */
2450         wait_for_completion_timeout(&tm_done,
2451                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2452
2453         spin_lock_irqsave(io_lock, flags);
2454         io_req = (struct fnic_io_req *)CMD_SP(sc);
2455         if (!io_req) {
2456                 spin_unlock_irqrestore(io_lock, flags);
2457                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2458                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2459                 goto fnic_device_reset_end;
2460         }
2461         io_req->dr_done = NULL;
2462
2463         status = CMD_LR_STATUS(sc);
2464
2465         /*
2466          * If lun reset not completed, bail out with failed. io_req
2467          * gets cleaned up during higher levels of EH
2468          */
2469         if (status == FCPIO_INVALID_CODE) {
2470                 atomic64_inc(&reset_stats->device_reset_timeouts);
2471                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2472                               "Device reset timed out\n");
2473                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2474                 spin_unlock_irqrestore(io_lock, flags);
2475                 int_to_scsilun(sc->device->lun, &fc_lun);
2476                 /*
2477                  * Issue abort and terminate on device reset request.
2478                  * If q'ing of terminate fails, retry it after a delay.
2479                  */
2480                 while (1) {
2481                         spin_lock_irqsave(io_lock, flags);
2482                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2483                                 spin_unlock_irqrestore(io_lock, flags);
2484                                 break;
2485                         }
2486                         spin_unlock_irqrestore(io_lock, flags);
2487                         if (fnic_queue_abort_io_req(fnic,
2488                                 tag | FNIC_TAG_DEV_RST,
2489                                 FCPIO_ITMF_ABT_TASK_TERM,
2490                                 fc_lun.scsi_lun, io_req)) {
2491                                 wait_for_completion_timeout(&tm_done,
2492                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2493                         } else {
2494                                 spin_lock_irqsave(io_lock, flags);
2495                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2496                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2497                                 io_req->abts_done = &tm_done;
2498                                 spin_unlock_irqrestore(io_lock, flags);
2499                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2500                                 "Abort and terminate issued on Device reset "
2501                                 "tag 0x%x sc 0x%p\n", tag, sc);
2502                                 break;
2503                         }
2504                 }
2505                 while (1) {
2506                         spin_lock_irqsave(io_lock, flags);
2507                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2508                                 spin_unlock_irqrestore(io_lock, flags);
2509                                 wait_for_completion_timeout(&tm_done,
2510                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2511                                 break;
2512                         } else {
2513                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2514                                 io_req->abts_done = NULL;
2515                                 goto fnic_device_reset_clean;
2516                         }
2517                 }
2518         } else {
2519                 spin_unlock_irqrestore(io_lock, flags);
2520         }
2521
2522         /* Completed, but not successful, clean up the io_req, return fail */
2523         if (status != FCPIO_SUCCESS) {
2524                 spin_lock_irqsave(io_lock, flags);
2525                 FNIC_SCSI_DBG(KERN_DEBUG,
2526                               fnic->lport->host,
2527                               "Device reset completed - failed\n");
2528                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2529                 goto fnic_device_reset_clean;
2530         }
2531
2532         /*
2533          * Clean up any aborts on this lun that have still not
2534          * completed. If any of these fail, then LUN reset fails.
2535          * clean_pending_aborts cleans all cmds on this lun except
2536          * the lun reset cmd. If all cmds get cleaned, the lun reset
2537          * succeeds
2538          */
2539         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2540                 spin_lock_irqsave(io_lock, flags);
2541                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2542                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2543                               "Device reset failed"
2544                               " since could not abort all IOs\n");
2545                 goto fnic_device_reset_clean;
2546         }
2547
2548         /* Clean lun reset command */
2549         spin_lock_irqsave(io_lock, flags);
2550         io_req = (struct fnic_io_req *)CMD_SP(sc);
2551         if (io_req)
2552                 /* Completed, and successful */
2553                 ret = SUCCESS;
2554
2555 fnic_device_reset_clean:
2556         if (io_req)
2557                 CMD_SP(sc) = NULL;
2558
2559         spin_unlock_irqrestore(io_lock, flags);
2560
2561         if (io_req) {
2562                 start_time = io_req->start_time;
2563                 fnic_release_ioreq_buf(fnic, io_req, sc);
2564                 mempool_free(io_req, fnic->io_req_pool);
2565         }
2566
2567 fnic_device_reset_end:
2568         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2569                   sc->request->tag, sc,
2570                   jiffies_to_msecs(jiffies - start_time),
2571                   0, ((u64)sc->cmnd[0] << 32 |
2572                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2573                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2574                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2575
2576         /* free tag if it is allocated */
2577         if (unlikely(tag_gen_flag))
2578                 fnic_scsi_host_end_tag(fnic, sc);
2579
2580         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2581                       "Returning from device reset %s\n",
2582                       (ret == SUCCESS) ?
2583                       "SUCCESS" : "FAILED");
2584
2585         if (ret == FAILED)
2586                 atomic64_inc(&reset_stats->device_reset_failures);
2587
2588         return ret;
2589 }
2590
2591 /* Clean up all IOs, clean up libFC local port */
2592 int fnic_reset(struct Scsi_Host *shost)
2593 {
2594         struct fc_lport *lp;
2595         struct fnic *fnic;
2596         int ret = 0;
2597         struct reset_stats *reset_stats;
2598
2599         lp = shost_priv(shost);
2600         fnic = lport_priv(lp);
2601         reset_stats = &fnic->fnic_stats.reset_stats;
2602
2603         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2604                       "fnic_reset called\n");
2605
2606         atomic64_inc(&reset_stats->fnic_resets);
2607
2608         /*
2609          * Reset local port, this will clean up libFC exchanges,
2610          * reset remote port sessions, and if link is up, begin flogi
2611          */
2612         ret = fc_lport_reset(lp);
2613
2614         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2615                       "Returning from fnic reset %s\n",
2616                       (ret == 0) ?
2617                       "SUCCESS" : "FAILED");
2618
2619         if (ret == 0)
2620                 atomic64_inc(&reset_stats->fnic_reset_completions);
2621         else
2622                 atomic64_inc(&reset_stats->fnic_reset_failures);
2623
2624         return ret;
2625 }
2626
2627 /*
2628  * SCSI Error handling calls driver's eh_host_reset if all prior
2629  * error handling levels return FAILED. If host reset completes
2630  * successfully, and if link is up, then Fabric login begins.
2631  *
2632  * Host Reset is the highest level of error recovery. If this fails, then
2633  * host is offlined by SCSI.
2634  *
2635  */
2636 int fnic_host_reset(struct scsi_cmnd *sc)
2637 {
2638         int ret;
2639         unsigned long wait_host_tmo;
2640         struct Scsi_Host *shost = sc->device->host;
2641         struct fc_lport *lp = shost_priv(shost);
2642         struct fnic *fnic = lport_priv(lp);
2643         unsigned long flags;
2644
2645         spin_lock_irqsave(&fnic->fnic_lock, flags);
2646         if (fnic->internal_reset_inprogress == 0) {
2647                 fnic->internal_reset_inprogress = 1;
2648         } else {
2649                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2650                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2651                         "host reset in progress skipping another host reset\n");
2652                 return SUCCESS;
2653         }
2654         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2655
2656         /*
2657          * If fnic_reset is successful, wait for fabric login to complete
2658          * scsi-ml tries to send a TUR to every device if host reset is
2659          * successful, so before returning to scsi, fabric should be up
2660          */
2661         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2662         if (ret == SUCCESS) {
2663                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2664                 ret = FAILED;
2665                 while (time_before(jiffies, wait_host_tmo)) {
2666                         if ((lp->state == LPORT_ST_READY) &&
2667                             (lp->link_up)) {
2668                                 ret = SUCCESS;
2669                                 break;
2670                         }
2671                         ssleep(1);
2672                 }
2673         }
2674
2675         spin_lock_irqsave(&fnic->fnic_lock, flags);
2676         fnic->internal_reset_inprogress = 0;
2677         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2678         return ret;
2679 }
2680
2681 /*
2682  * This fxn is called from libFC when host is removed
2683  */
2684 void fnic_scsi_abort_io(struct fc_lport *lp)
2685 {
2686         int err = 0;
2687         unsigned long flags;
2688         enum fnic_state old_state;
2689         struct fnic *fnic = lport_priv(lp);
2690         DECLARE_COMPLETION_ONSTACK(remove_wait);
2691
2692         /* Issue firmware reset for fnic, wait for reset to complete */
2693 retry_fw_reset:
2694         spin_lock_irqsave(&fnic->fnic_lock, flags);
2695         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2696                 /* fw reset is in progress, poll for its completion */
2697                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2698                 schedule_timeout(msecs_to_jiffies(100));
2699                 goto retry_fw_reset;
2700         }
2701
2702         fnic->remove_wait = &remove_wait;
2703         old_state = fnic->state;
2704         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2705         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2706         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2707
2708         err = fnic_fw_reset_handler(fnic);
2709         if (err) {
2710                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2711                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2712                         fnic->state = old_state;
2713                 fnic->remove_wait = NULL;
2714                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2715                 return;
2716         }
2717
2718         /* Wait for firmware reset to complete */
2719         wait_for_completion_timeout(&remove_wait,
2720                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2721
2722         spin_lock_irqsave(&fnic->fnic_lock, flags);
2723         fnic->remove_wait = NULL;
2724         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2725                       "fnic_scsi_abort_io %s\n",
2726                       (fnic->state == FNIC_IN_ETH_MODE) ?
2727                       "SUCCESS" : "FAILED");
2728         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2729
2730 }
2731
2732 /*
2733  * This fxn called from libFC to clean up driver IO state on link down
2734  */
2735 void fnic_scsi_cleanup(struct fc_lport *lp)
2736 {
2737         unsigned long flags;
2738         enum fnic_state old_state;
2739         struct fnic *fnic = lport_priv(lp);
2740
2741         /* issue fw reset */
2742 retry_fw_reset:
2743         spin_lock_irqsave(&fnic->fnic_lock, flags);
2744         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2745                 /* fw reset is in progress, poll for its completion */
2746                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2747                 schedule_timeout(msecs_to_jiffies(100));
2748                 goto retry_fw_reset;
2749         }
2750         old_state = fnic->state;
2751         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2752         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2753         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2754
2755         if (fnic_fw_reset_handler(fnic)) {
2756                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2757                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2758                         fnic->state = old_state;
2759                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2760         }
2761
2762 }
2763
2764 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2765 {
2766 }
2767
2768 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2769 {
2770         struct fnic *fnic = lport_priv(lp);
2771
2772         /* Non-zero sid, nothing to do */
2773         if (sid)
2774                 goto call_fc_exch_mgr_reset;
2775
2776         if (did) {
2777                 fnic_rport_exch_reset(fnic, did);
2778                 goto call_fc_exch_mgr_reset;
2779         }
2780
2781         /*
2782          * sid = 0, did = 0
2783          * link down or device being removed
2784          */
2785         if (!fnic->in_remove)
2786                 fnic_scsi_cleanup(lp);
2787         else
2788                 fnic_scsi_abort_io(lp);
2789
2790         /* call libFC exch mgr reset to reset its exchanges */
2791 call_fc_exch_mgr_reset:
2792         fc_exch_mgr_reset(lp, sid, did);
2793
2794 }
2795
2796 /*
2797  * fnic_is_abts_pending() is a helper function that
2798  * walks through tag map to check if there is any IOs pending,if there is one,
2799  * then it returns 1 (true), otherwise 0 (false)
2800  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2801  * otherwise, it checks for all IOs.
2802  */
2803 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2804 {
2805         int tag;
2806         struct fnic_io_req *io_req;
2807         spinlock_t *io_lock;
2808         unsigned long flags;
2809         int ret = 0;
2810         struct scsi_cmnd *sc;
2811         struct scsi_device *lun_dev = NULL;
2812
2813         if (lr_sc)
2814                 lun_dev = lr_sc->device;
2815
2816         /* walk again to check, if IOs are still pending in fw */
2817         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2818                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2819                 /*
2820                  * ignore this lun reset cmd or cmds that do not belong to
2821                  * this lun
2822                  */
2823                 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2824                         continue;
2825
2826                 io_lock = fnic_io_lock_hash(fnic, sc);
2827                 spin_lock_irqsave(io_lock, flags);
2828
2829                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2830
2831                 if (!io_req || sc->device != lun_dev) {
2832                         spin_unlock_irqrestore(io_lock, flags);
2833                         continue;
2834                 }
2835
2836                 /*
2837                  * Found IO that is still pending with firmware and
2838                  * belongs to the LUN that we are resetting
2839                  */
2840                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2841                               "Found IO in %s on lun\n",
2842                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2843
2844                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2845                         ret = 1;
2846                 spin_unlock_irqrestore(io_lock, flags);
2847         }
2848
2849         return ret;
2850 }