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                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 130                                  sizeof(io_req->sgl_list[0]) * io_req->sgl_cnt,
 131                                  DMA_TO_DEVICE);
 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                 dma_unmap_single(&fnic->pdev->dev, io_req->sense_buf_pa,
 139                                  SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 140 }
 141
 142 /* Free up Copy Wq descriptors. Called with copy_wq lock held */
 143 static int free_wq_copy_descs(struct fnic *fnic, struct vnic_wq_copy *wq)
 144 {
 145         /* if no Ack received from firmware, then nothing to clean */
 146         if (!fnic->fw_ack_recd[0])
 147                 return 1;
 148
 149         /*
 150          * Update desc_available count based on number of freed descriptors
 151          * Account for wraparound
 152          */
 153         if (wq->to_clean_index <= fnic->fw_ack_index[0])
 154                 wq->ring.desc_avail += (fnic->fw_ack_index[0]
 155                                         - wq->to_clean_index + 1);
 156         else
 157                 wq->ring.desc_avail += (wq->ring.desc_count
 158                                         - wq->to_clean_index
 159                                         + fnic->fw_ack_index[0] + 1);
 160
 161         /*
 162          * just bump clean index to ack_index+1 accounting for wraparound
 163          * this will essentially free up all descriptors between
 164          * to_clean_index and fw_ack_index, both inclusive
 165          */
 166         wq->to_clean_index =
 167                 (fnic->fw_ack_index[0] + 1) % wq->ring.desc_count;
 168
 169         /* we have processed the acks received so far */
 170         fnic->fw_ack_recd[0] = 0;
 171         return 0;
 172 }
 173
 174
 175 /**
 176  * __fnic_set_state_flags
 177  * Sets/Clears bits in fnic's state_flags
 178  **/
 179 void
 180 __fnic_set_state_flags(struct fnic *fnic, unsigned long st_flags,
 181                         unsigned long clearbits)
 182 {
 183         struct Scsi_Host *host = fnic->lport->host;
 184         int sh_locked = spin_is_locked(host->host_lock);
 185         unsigned long flags = 0;
 186
 187         if (!sh_locked)
 188                 spin_lock_irqsave(host->host_lock, flags);
 189
 190         if (clearbits)
 191                 fnic->state_flags &= ~st_flags;
 192         else
 193                 fnic->state_flags |= st_flags;
 194
 195         if (!sh_locked)
 196                 spin_unlock_irqrestore(host->host_lock, flags);
 197
 198         return;
 199 }
 200
 201
 202 /*
 203  * fnic_fw_reset_handler
 204  * Routine to send reset msg to fw
 205  */
 206 int fnic_fw_reset_handler(struct fnic *fnic)
 207 {
 208         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 209         int ret = 0;
 210         unsigned long flags;
 211
 212         /* indicate fwreset to io path */
 213         fnic_set_state_flags(fnic, FNIC_FLAGS_FWRESET);
 214
 215         skb_queue_purge(&fnic->frame_queue);
 216         skb_queue_purge(&fnic->tx_queue);
 217
 218         /* wait for io cmpl */
 219         while (atomic_read(&fnic->in_flight))
 220                 schedule_timeout(msecs_to_jiffies(1));
 221
 222         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 223
 224         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 225                 free_wq_copy_descs(fnic, wq);
 226
 227         if (!vnic_wq_copy_desc_avail(wq))
 228                 ret = -EAGAIN;
 229         else {
 230                 fnic_queue_wq_copy_desc_fw_reset(wq, SCSI_NO_TAG);
 231                 atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 232                 if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 233                           atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 234                         atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 235                                 atomic64_read(
 236                                   &fnic->fnic_stats.fw_stats.active_fw_reqs));
 237         }
 238
 239         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 240
 241         if (!ret) {
 242                 atomic64_inc(&fnic->fnic_stats.reset_stats.fw_resets);
 243                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 244                               "Issued fw reset\n");
 245         } else {
 246                 fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 247                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 248                               "Failed to issue fw reset\n");
 249         }
 250
 251         return ret;
 252 }
 253
 254
 255 /*
 256  * fnic_flogi_reg_handler
 257  * Routine to send flogi register msg to fw
 258  */
 259 int fnic_flogi_reg_handler(struct fnic *fnic, u32 fc_id)
 260 {
 261         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
 262         enum fcpio_flogi_reg_format_type format;
 263         struct fc_lport *lp = fnic->lport;
 264         u8 gw_mac[ETH_ALEN];
 265         int ret = 0;
 266         unsigned long flags;
 267
 268         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 269
 270         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 271                 free_wq_copy_descs(fnic, wq);
 272
 273         if (!vnic_wq_copy_desc_avail(wq)) {
 274                 ret = -EAGAIN;
 275                 goto flogi_reg_ioreq_end;
 276         }
 277
 278         if (fnic->ctlr.map_dest) {
 279                 memset(gw_mac, 0xff, ETH_ALEN);
 280                 format = FCPIO_FLOGI_REG_DEF_DEST;
 281         } else {
 282                 memcpy(gw_mac, fnic->ctlr.dest_addr, ETH_ALEN);
 283                 format = FCPIO_FLOGI_REG_GW_DEST;
 284         }
 285
 286         if ((fnic->config.flags & VFCF_FIP_CAPABLE) && !fnic->ctlr.map_dest) {
 287                 fnic_queue_wq_copy_desc_fip_reg(wq, SCSI_NO_TAG,
 288                                                 fc_id, gw_mac,
 289                                                 fnic->data_src_addr,
 290                                                 lp->r_a_tov, lp->e_d_tov);
 291                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 292                               "FLOGI FIP reg issued fcid %x src %pM dest %pM\n",
 293                               fc_id, fnic->data_src_addr, gw_mac);
 294         } else {
 295                 fnic_queue_wq_copy_desc_flogi_reg(wq, SCSI_NO_TAG,
 296                                                   format, fc_id, gw_mac);
 297                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 298                               "FLOGI reg issued fcid %x map %d dest %pM\n",
 299                               fc_id, fnic->ctlr.map_dest, gw_mac);
 300         }
 301
 302         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 303         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 304                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 305                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 306                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 307
 308 flogi_reg_ioreq_end:
 309         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 310         return ret;
 311 }
 312
 313 /*
 314  * fnic_queue_wq_copy_desc
 315  * Routine to enqueue a wq copy desc
 316  */
 317 static inline int fnic_queue_wq_copy_desc(struct fnic *fnic,
 318                                           struct vnic_wq_copy *wq,
 319                                           struct fnic_io_req *io_req,
 320                                           struct scsi_cmnd *sc,
 321                                           int sg_count)
 322 {
 323         struct scatterlist *sg;
 324         struct fc_rport *rport = starget_to_rport(scsi_target(sc->device));
 325         struct fc_rport_libfc_priv *rp = rport->dd_data;
 326         struct host_sg_desc *desc;
 327         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
 328         unsigned int i;
 329         unsigned long intr_flags;
 330         int flags;
 331         u8 exch_flags;
 332         struct scsi_lun fc_lun;
 333
 334         if (sg_count) {
 335                 /* For each SGE, create a device desc entry */
 336                 desc = io_req->sgl_list;
 337                 for_each_sg(scsi_sglist(sc), sg, sg_count, i) {
 338                         desc->addr = cpu_to_le64(sg_dma_address(sg));
 339                         desc->len = cpu_to_le32(sg_dma_len(sg));
 340                         desc->_resvd = 0;
 341                         desc++;
 342                 }
 343
 344                 io_req->sgl_list_pa = dma_map_single(&fnic->pdev->dev,
 345                                 io_req->sgl_list,
 346                                 sizeof(io_req->sgl_list[0]) * sg_count,
 347                                 DMA_TO_DEVICE);
 348                 if (dma_mapping_error(&fnic->pdev->dev, io_req->sgl_list_pa)) {
 349                         printk(KERN_ERR "DMA mapping failed\n");
 350                         return SCSI_MLQUEUE_HOST_BUSY;
 351                 }
 352         }
 353
 354         io_req->sense_buf_pa = dma_map_single(&fnic->pdev->dev,
 355                                               sc->sense_buffer,
 356                                               SCSI_SENSE_BUFFERSIZE,
 357                                               DMA_FROM_DEVICE);
 358         if (dma_mapping_error(&fnic->pdev->dev, io_req->sense_buf_pa)) {
 359                 dma_unmap_single(&fnic->pdev->dev, io_req->sgl_list_pa,
 360                                 sizeof(io_req->sgl_list[0]) * sg_count,
 361                                 DMA_TO_DEVICE);
 362                 printk(KERN_ERR "DMA mapping failed\n");
 363                 return SCSI_MLQUEUE_HOST_BUSY;
 364         }
 365
 366         int_to_scsilun(sc->device->lun, &fc_lun);
 367
 368         /* Enqueue the descriptor in the Copy WQ */
 369         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
 370
 371         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
 372                 free_wq_copy_descs(fnic, wq);
 373
 374         if (unlikely(!vnic_wq_copy_desc_avail(wq))) {
 375                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 376                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 377                           "fnic_queue_wq_copy_desc failure - no descriptors\n");
 378                 atomic64_inc(&misc_stats->io_cpwq_alloc_failures);
 379                 return SCSI_MLQUEUE_HOST_BUSY;
 380         }
 381
 382         flags = 0;
 383         if (sc->sc_data_direction == DMA_FROM_DEVICE)
 384                 flags = FCPIO_ICMND_RDDATA;
 385         else if (sc->sc_data_direction == DMA_TO_DEVICE)
 386                 flags = FCPIO_ICMND_WRDATA;
 387
 388         exch_flags = 0;
 389         if ((fnic->config.flags & VFCF_FCP_SEQ_LVL_ERR) &&
 390             (rp->flags & FC_RP_FLAGS_RETRY))
 391                 exch_flags |= FCPIO_ICMND_SRFLAG_RETRY;
 392
 393         fnic_queue_wq_copy_desc_icmnd_16(wq, sc->request->tag,
 394                                          0, exch_flags, io_req->sgl_cnt,
 395                                          SCSI_SENSE_BUFFERSIZE,
 396                                          io_req->sgl_list_pa,
 397                                          io_req->sense_buf_pa,
 398                                          0, /* scsi cmd ref, always 0 */
 399                                          FCPIO_ICMND_PTA_SIMPLE,
 400                                                 /* scsi pri and tag */
 401                                          flags, /* command flags */
 402                                          sc->cmnd, sc->cmd_len,
 403                                          scsi_bufflen(sc),
 404                                          fc_lun.scsi_lun, io_req->port_id,
 405                                          rport->maxframe_size, rp->r_a_tov,
 406                                          rp->e_d_tov);
 407
 408         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
 409         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
 410                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
 411                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
 412                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
 413
 414         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
 415         return 0;
 416 }
 417
 418 /*
 419  * fnic_queuecommand
 420  * Routine to send a scsi cdb
 421  * Called with host_lock held and interrupts disabled.
 422  */
 423 static int fnic_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 424 {
 425         struct fc_lport *lp = shost_priv(sc->device->host);
 426         struct fc_rport *rport;
 427         struct fnic_io_req *io_req = NULL;
 428         struct fnic *fnic = lport_priv(lp);
 429         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 430         struct vnic_wq_copy *wq;
 431         int ret;
 432         u64 cmd_trace;
 433         int sg_count = 0;
 434         unsigned long flags = 0;
 435         unsigned long ptr;
 436         spinlock_t *io_lock = NULL;
 437         int io_lock_acquired = 0;
 438         struct fc_rport_libfc_priv *rp;
 439
 440         if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
 441                 return SCSI_MLQUEUE_HOST_BUSY;
 442
 443         rport = starget_to_rport(scsi_target(sc->device));
 444         if (!rport) {
 445                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 446                                 "returning DID_NO_CONNECT for IO as rport is NULL\n");
 447                 sc->result = DID_NO_CONNECT << 16;
 448                 done(sc);
 449                 return 0;
 450         }
 451
 452         ret = fc_remote_port_chkready(rport);
 453         if (ret) {
 454                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 455                                 "rport is not ready\n");
 456                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 457                 sc->result = ret;
 458                 done(sc);
 459                 return 0;
 460         }
 461
 462         rp = rport->dd_data;
 463         if (!rp || rp->rp_state == RPORT_ST_DELETE) {
 464                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 465                         "rport 0x%x removed, returning DID_NO_CONNECT\n",
 466                         rport->port_id);
 467
 468                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
 469                 sc->result = DID_NO_CONNECT<<16;
 470                 done(sc);
 471                 return 0;
 472         }
 473
 474         if (rp->rp_state != RPORT_ST_READY) {
 475                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 476                         "rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
 477                         rport->port_id, rp->rp_state);
 478
 479                 sc->result = DID_IMM_RETRY << 16;
 480                 done(sc);
 481                 return 0;
 482         }
 483
 484         if (lp->state != LPORT_ST_READY || !(lp->link_up))
 485                 return SCSI_MLQUEUE_HOST_BUSY;
 486
 487         atomic_inc(&fnic->in_flight);
 488
 489         /*
 490          * Release host lock, use driver resource specific locks from here.
 491          * Don't re-enable interrupts in case they were disabled prior to the
 492          * caller disabling them.
 493          */
 494         spin_unlock(lp->host->host_lock);
 495         CMD_STATE(sc) = FNIC_IOREQ_NOT_INITED;
 496         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
 497
 498         /* Get a new io_req for this SCSI IO */
 499         io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
 500         if (!io_req) {
 501                 atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 502                 ret = SCSI_MLQUEUE_HOST_BUSY;
 503                 goto out;
 504         }
 505         memset(io_req, 0, sizeof(*io_req));
 506
 507         /* Map the data buffer */
 508         sg_count = scsi_dma_map(sc);
 509         if (sg_count < 0) {
 510                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 511                           sc->request->tag, sc, 0, sc->cmnd[0],
 512                           sg_count, CMD_STATE(sc));
 513                 mempool_free(io_req, fnic->io_req_pool);
 514                 goto out;
 515         }
 516
 517         /* Determine the type of scatter/gather list we need */
 518         io_req->sgl_cnt = sg_count;
 519         io_req->sgl_type = FNIC_SGL_CACHE_DFLT;
 520         if (sg_count > FNIC_DFLT_SG_DESC_CNT)
 521                 io_req->sgl_type = FNIC_SGL_CACHE_MAX;
 522
 523         if (sg_count) {
 524                 io_req->sgl_list =
 525                         mempool_alloc(fnic->io_sgl_pool[io_req->sgl_type],
 526                                       GFP_ATOMIC);
 527                 if (!io_req->sgl_list) {
 528                         atomic64_inc(&fnic_stats->io_stats.alloc_failures);
 529                         ret = SCSI_MLQUEUE_HOST_BUSY;
 530                         scsi_dma_unmap(sc);
 531                         mempool_free(io_req, fnic->io_req_pool);
 532                         goto out;
 533                 }
 534
 535                 /* Cache sgl list allocated address before alignment */
 536                 io_req->sgl_list_alloc = io_req->sgl_list;
 537                 ptr = (unsigned long) io_req->sgl_list;
 538                 if (ptr % FNIC_SG_DESC_ALIGN) {
 539                         io_req->sgl_list = (struct host_sg_desc *)
 540                                 (((unsigned long) ptr
 541                                   + FNIC_SG_DESC_ALIGN - 1)
 542                                  & ~(FNIC_SG_DESC_ALIGN - 1));
 543                 }
 544         }
 545
 546         /*
 547         * Will acquire lock defore setting to IO initialized.
 548         */
 549
 550         io_lock = fnic_io_lock_hash(fnic, sc);
 551         spin_lock_irqsave(io_lock, flags);
 552
 553         /* initialize rest of io_req */
 554         io_lock_acquired = 1;
 555         io_req->port_id = rport->port_id;
 556         io_req->start_time = jiffies;
 557         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
 558         CMD_SP(sc) = (char *)io_req;
 559         CMD_FLAGS(sc) |= FNIC_IO_INITIALIZED;
 560         sc->scsi_done = done;
 561
 562         /* create copy wq desc and enqueue it */
 563         wq = &fnic->wq_copy[0];
 564         ret = fnic_queue_wq_copy_desc(fnic, wq, io_req, sc, sg_count);
 565         if (ret) {
 566                 /*
 567                  * In case another thread cancelled the request,
 568                  * refetch the pointer under the lock.
 569                  */
 570                 FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 571                           sc->request->tag, sc, 0, 0, 0,
 572                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
 573                 io_req = (struct fnic_io_req *)CMD_SP(sc);
 574                 CMD_SP(sc) = NULL;
 575                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 576                 spin_unlock_irqrestore(io_lock, flags);
 577                 if (io_req) {
 578                         fnic_release_ioreq_buf(fnic, io_req, sc);
 579                         mempool_free(io_req, fnic->io_req_pool);
 580                 }
 581                 atomic_dec(&fnic->in_flight);
 582                 /* acquire host lock before returning to SCSI */
 583                 spin_lock(lp->host->host_lock);
 584                 return ret;
 585         } else {
 586                 atomic64_inc(&fnic_stats->io_stats.active_ios);
 587                 atomic64_inc(&fnic_stats->io_stats.num_ios);
 588                 if (atomic64_read(&fnic_stats->io_stats.active_ios) >
 589                           atomic64_read(&fnic_stats->io_stats.max_active_ios))
 590                         atomic64_set(&fnic_stats->io_stats.max_active_ios,
 591                              atomic64_read(&fnic_stats->io_stats.active_ios));
 592
 593                 /* REVISIT: Use per IO lock in the final code */
 594                 CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
 595         }
 596 out:
 597         cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
 598                         (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
 599                         (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
 600                         sc->cmnd[5]);
 601
 602         FNIC_TRACE(fnic_queuecommand, sc->device->host->host_no,
 603                   sc->request->tag, sc, io_req,
 604                   sg_count, cmd_trace,
 605                   (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
 606
 607         /* if only we issued IO, will we have the io lock */
 608         if (io_lock_acquired)
 609                 spin_unlock_irqrestore(io_lock, flags);
 610
 611         atomic_dec(&fnic->in_flight);
 612         /* acquire host lock before returning to SCSI */
 613         spin_lock(lp->host->host_lock);
 614         return ret;
 615 }
 616
 617 DEF_SCSI_QCMD(fnic_queuecommand)
 618
 619 /*
 620  * fnic_fcpio_fw_reset_cmpl_handler
 621  * Routine to handle fw reset completion
 622  */
 623 static int fnic_fcpio_fw_reset_cmpl_handler(struct fnic *fnic,
 624                                             struct fcpio_fw_req *desc)
 625 {
 626         u8 type;
 627         u8 hdr_status;
 628         struct fcpio_tag tag;
 629         int ret = 0;
 630         unsigned long flags;
 631         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
 632
 633         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 634
 635         atomic64_inc(&reset_stats->fw_reset_completions);
 636
 637         /* Clean up all outstanding io requests */
 638         fnic_cleanup_io(fnic, SCSI_NO_TAG);
 639
 640         atomic64_set(&fnic->fnic_stats.fw_stats.active_fw_reqs, 0);
 641         atomic64_set(&fnic->fnic_stats.io_stats.active_ios, 0);
 642         atomic64_set(&fnic->io_cmpl_skip, 0);
 643
 644         spin_lock_irqsave(&fnic->fnic_lock, flags);
 645
 646         /* fnic should be in FC_TRANS_ETH_MODE */
 647         if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE) {
 648                 /* Check status of reset completion */
 649                 if (!hdr_status) {
 650                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 651                                       "reset cmpl success\n");
 652                         /* Ready to send flogi out */
 653                         fnic->state = FNIC_IN_ETH_MODE;
 654                 } else {
 655                         FNIC_SCSI_DBG(KERN_DEBUG,
 656                                       fnic->lport->host,
 657                                       "fnic fw_reset : failed %s\n",
 658                                       fnic_fcpio_status_to_str(hdr_status));
 659
 660                         /*
 661                          * Unable to change to eth mode, cannot send out flogi
 662                          * Change state to fc mode, so that subsequent Flogi
 663                          * requests from libFC will cause more attempts to
 664                          * reset the firmware. Free the cached flogi
 665                          */
 666                         fnic->state = FNIC_IN_FC_MODE;
 667                         atomic64_inc(&reset_stats->fw_reset_failures);
 668                         ret = -1;
 669                 }
 670         } else {
 671                 FNIC_SCSI_DBG(KERN_DEBUG,
 672                               fnic->lport->host,
 673                               "Unexpected state %s while processing"
 674                               " reset cmpl\n", fnic_state_to_str(fnic->state));
 675                 atomic64_inc(&reset_stats->fw_reset_failures);
 676                 ret = -1;
 677         }
 678
 679         /* Thread removing device blocks till firmware reset is complete */
 680         if (fnic->remove_wait)
 681                 complete(fnic->remove_wait);
 682
 683         /*
 684          * If fnic is being removed, or fw reset failed
 685          * free the flogi frame. Else, send it out
 686          */
 687         if (fnic->remove_wait || ret) {
 688                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 689                 skb_queue_purge(&fnic->tx_queue);
 690                 goto reset_cmpl_handler_end;
 691         }
 692
 693         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 694
 695         fnic_flush_tx(fnic);
 696
 697  reset_cmpl_handler_end:
 698         fnic_clear_state_flags(fnic, FNIC_FLAGS_FWRESET);
 699
 700         return ret;
 701 }
 702
 703 /*
 704  * fnic_fcpio_flogi_reg_cmpl_handler
 705  * Routine to handle flogi register completion
 706  */
 707 static int fnic_fcpio_flogi_reg_cmpl_handler(struct fnic *fnic,
 708                                              struct fcpio_fw_req *desc)
 709 {
 710         u8 type;
 711         u8 hdr_status;
 712         struct fcpio_tag tag;
 713         int ret = 0;
 714         unsigned long flags;
 715
 716         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 717
 718         /* Update fnic state based on status of flogi reg completion */
 719         spin_lock_irqsave(&fnic->fnic_lock, flags);
 720
 721         if (fnic->state == FNIC_IN_ETH_TRANS_FC_MODE) {
 722
 723                 /* Check flogi registration completion status */
 724                 if (!hdr_status) {
 725                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 726                                       "flog reg succeeded\n");
 727                         fnic->state = FNIC_IN_FC_MODE;
 728                 } else {
 729                         FNIC_SCSI_DBG(KERN_DEBUG,
 730                                       fnic->lport->host,
 731                                       "fnic flogi reg :failed %s\n",
 732                                       fnic_fcpio_status_to_str(hdr_status));
 733                         fnic->state = FNIC_IN_ETH_MODE;
 734                         ret = -1;
 735                 }
 736         } else {
 737                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
 738                               "Unexpected fnic state %s while"
 739                               " processing flogi reg completion\n",
 740                               fnic_state_to_str(fnic->state));
 741                 ret = -1;
 742         }
 743
 744         if (!ret) {
 745                 if (fnic->stop_rx_link_events) {
 746                         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 747                         goto reg_cmpl_handler_end;
 748                 }
 749                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 750
 751                 fnic_flush_tx(fnic);
 752                 queue_work(fnic_event_queue, &fnic->frame_work);
 753         } else {
 754                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 755         }
 756
 757 reg_cmpl_handler_end:
 758         return ret;
 759 }
 760
 761 static inline int is_ack_index_in_range(struct vnic_wq_copy *wq,
 762                                         u16 request_out)
 763 {
 764         if (wq->to_clean_index <= wq->to_use_index) {
 765                 /* out of range, stale request_out index */
 766                 if (request_out < wq->to_clean_index ||
 767                     request_out >= wq->to_use_index)
 768                         return 0;
 769         } else {
 770                 /* out of range, stale request_out index */
 771                 if (request_out < wq->to_clean_index &&
 772                     request_out >= wq->to_use_index)
 773                         return 0;
 774         }
 775         /* request_out index is in range */
 776         return 1;
 777 }
 778
 779
 780 /*
 781  * Mark that ack received and store the Ack index. If there are multiple
 782  * acks received before Tx thread cleans it up, the latest value will be
 783  * used which is correct behavior. This state should be in the copy Wq
 784  * instead of in the fnic
 785  */
 786 static inline void fnic_fcpio_ack_handler(struct fnic *fnic,
 787                                           unsigned int cq_index,
 788                                           struct fcpio_fw_req *desc)
 789 {
 790         struct vnic_wq_copy *wq;
 791         u16 request_out = desc->u.ack.request_out;
 792         unsigned long flags;
 793         u64 *ox_id_tag = (u64 *)(void *)desc;
 794
 795         /* mark the ack state */
 796         wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
 797         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
 798
 799         fnic->fnic_stats.misc_stats.last_ack_time = jiffies;
 800         if (is_ack_index_in_range(wq, request_out)) {
 801                 fnic->fw_ack_index[0] = request_out;
 802                 fnic->fw_ack_recd[0] = 1;
 803         } else
 804                 atomic64_inc(
 805                         &fnic->fnic_stats.misc_stats.ack_index_out_of_range);
 806
 807         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
 808         FNIC_TRACE(fnic_fcpio_ack_handler,
 809                   fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
 810                   ox_id_tag[4], ox_id_tag[5]);
 811 }
 812
 813 /*
 814  * fnic_fcpio_icmnd_cmpl_handler
 815  * Routine to handle icmnd completions
 816  */
 817 static void fnic_fcpio_icmnd_cmpl_handler(struct fnic *fnic,
 818                                          struct fcpio_fw_req *desc)
 819 {
 820         u8 type;
 821         u8 hdr_status;
 822         struct fcpio_tag tag;
 823         u32 id;
 824         u64 xfer_len = 0;
 825         struct fcpio_icmnd_cmpl *icmnd_cmpl;
 826         struct fnic_io_req *io_req;
 827         struct scsi_cmnd *sc;
 828         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
 829         unsigned long flags;
 830         spinlock_t *io_lock;
 831         u64 cmd_trace;
 832         unsigned long start_time;
 833         unsigned long io_duration_time;
 834
 835         /* Decode the cmpl description to get the io_req id */
 836         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
 837         fcpio_tag_id_dec(&tag, &id);
 838         icmnd_cmpl = &desc->u.icmnd_cmpl;
 839
 840         if (id >= fnic->fnic_max_tag_id) {
 841                 shost_printk(KERN_ERR, fnic->lport->host,
 842                         "Tag out of range tag %x hdr status = %s\n",
 843                              id, fnic_fcpio_status_to_str(hdr_status));
 844                 return;
 845         }
 846
 847         sc = scsi_host_find_tag(fnic->lport->host, id);
 848         WARN_ON_ONCE(!sc);
 849         if (!sc) {
 850                 atomic64_inc(&fnic_stats->io_stats.sc_null);
 851                 shost_printk(KERN_ERR, fnic->lport->host,
 852                           "icmnd_cmpl sc is null - "
 853                           "hdr status = %s tag = 0x%x desc = 0x%p\n",
 854                           fnic_fcpio_status_to_str(hdr_status), id, desc);
 855                 FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
 856                           fnic->lport->host->host_no, id,
 857                           ((u64)icmnd_cmpl->_resvd0[1] << 16 |
 858                           (u64)icmnd_cmpl->_resvd0[0]),
 859                           ((u64)hdr_status << 16 |
 860                           (u64)icmnd_cmpl->scsi_status << 8 |
 861                           (u64)icmnd_cmpl->flags), desc,
 862                           (u64)icmnd_cmpl->residual, 0);
 863                 return;
 864         }
 865
 866         io_lock = fnic_io_lock_hash(fnic, sc);
 867         spin_lock_irqsave(io_lock, flags);
 868         io_req = (struct fnic_io_req *)CMD_SP(sc);
 869         WARN_ON_ONCE(!io_req);
 870         if (!io_req) {
 871                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
 872                 CMD_FLAGS(sc) |= FNIC_IO_REQ_NULL;
 873                 spin_unlock_irqrestore(io_lock, flags);
 874                 shost_printk(KERN_ERR, fnic->lport->host,
 875                           "icmnd_cmpl io_req is null - "
 876                           "hdr status = %s tag = 0x%x sc 0x%p\n",
 877                           fnic_fcpio_status_to_str(hdr_status), id, sc);
 878                 return;
 879         }
 880         start_time = io_req->start_time;
 881
 882         /* firmware completed the io */
 883         io_req->io_completed = 1;
 884
 885         /*
 886          *  if SCSI-ML has already issued abort on this command,
 887          *  set completion of the IO. The abts path will clean it up
 888          */
 889         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
 890
 891                 /*
 892                  * set the FNIC_IO_DONE so that this doesn't get
 893                  * flagged as 'out of order' if it was not aborted
 894                  */
 895                 CMD_FLAGS(sc) |= FNIC_IO_DONE;
 896                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_PENDING;
 897                 spin_unlock_irqrestore(io_lock, flags);
 898                 if(FCPIO_ABORTED == hdr_status)
 899                         CMD_FLAGS(sc) |= FNIC_IO_ABORTED;
 900
 901                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
 902                         "icmnd_cmpl abts pending "
 903                           "hdr status = %s tag = 0x%x sc = 0x%p "
 904                           "scsi_status = %x residual = %d\n",
 905                           fnic_fcpio_status_to_str(hdr_status),
 906                           id, sc,
 907                           icmnd_cmpl->scsi_status,
 908                           icmnd_cmpl->residual);
 909                 return;
 910         }
 911
 912         /* Mark the IO as complete */
 913         CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
 914
 915         icmnd_cmpl = &desc->u.icmnd_cmpl;
 916
 917         switch (hdr_status) {
 918         case FCPIO_SUCCESS:
 919                 sc->result = (DID_OK << 16) | icmnd_cmpl->scsi_status;
 920                 xfer_len = scsi_bufflen(sc);
 921                 scsi_set_resid(sc, icmnd_cmpl->residual);
 922
 923                 if (icmnd_cmpl->flags & FCPIO_ICMND_CMPL_RESID_UNDER)
 924                         xfer_len -= icmnd_cmpl->residual;
 925
 926                 if (icmnd_cmpl->scsi_status == SAM_STAT_CHECK_CONDITION)
 927                         atomic64_inc(&fnic_stats->misc_stats.check_condition);
 928
 929                 if (icmnd_cmpl->scsi_status == SAM_STAT_TASK_SET_FULL)
 930                         atomic64_inc(&fnic_stats->misc_stats.queue_fulls);
 931                 break;
 932
 933         case FCPIO_TIMEOUT:          /* request was timed out */
 934                 atomic64_inc(&fnic_stats->misc_stats.fcpio_timeout);
 935                 sc->result = (DID_TIME_OUT << 16) | icmnd_cmpl->scsi_status;
 936                 break;
 937
 938         case FCPIO_ABORTED:          /* request was aborted */
 939                 atomic64_inc(&fnic_stats->misc_stats.fcpio_aborted);
 940                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 941                 break;
 942
 943         case FCPIO_DATA_CNT_MISMATCH: /* recv/sent more/less data than exp. */
 944                 atomic64_inc(&fnic_stats->misc_stats.data_count_mismatch);
 945                 scsi_set_resid(sc, icmnd_cmpl->residual);
 946                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 947                 break;
 948
 949         case FCPIO_OUT_OF_RESOURCE:  /* out of resources to complete request */
 950                 atomic64_inc(&fnic_stats->fw_stats.fw_out_of_resources);
 951                 sc->result = (DID_REQUEUE << 16) | icmnd_cmpl->scsi_status;
 952                 break;
 953
 954         case FCPIO_IO_NOT_FOUND:     /* requested I/O was not found */
 955                 atomic64_inc(&fnic_stats->io_stats.io_not_found);
 956                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 957                 break;
 958
 959         case FCPIO_SGL_INVALID:      /* request was aborted due to sgl error */
 960                 atomic64_inc(&fnic_stats->misc_stats.sgl_invalid);
 961                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 962                 break;
 963
 964         case FCPIO_FW_ERR:           /* request was terminated due fw error */
 965                 atomic64_inc(&fnic_stats->fw_stats.io_fw_errs);
 966                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 967                 break;
 968
 969         case FCPIO_MSS_INVALID:      /* request was aborted due to mss error */
 970                 atomic64_inc(&fnic_stats->misc_stats.mss_invalid);
 971                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 972                 break;
 973
 974         case FCPIO_INVALID_HEADER:   /* header contains invalid data */
 975         case FCPIO_INVALID_PARAM:    /* some parameter in request invalid */
 976         case FCPIO_REQ_NOT_SUPPORTED:/* request type is not supported */
 977         default:
 978                 sc->result = (DID_ERROR << 16) | icmnd_cmpl->scsi_status;
 979                 break;
 980         }
 981
 982         /* Break link with the SCSI command */
 983         CMD_SP(sc) = NULL;
 984         CMD_FLAGS(sc) |= FNIC_IO_DONE;
 985
 986         spin_unlock_irqrestore(io_lock, flags);
 987
 988         if (hdr_status != FCPIO_SUCCESS) {
 989                 atomic64_inc(&fnic_stats->io_stats.io_failures);
 990                 shost_printk(KERN_ERR, fnic->lport->host, "hdr status = %s\n",
 991                              fnic_fcpio_status_to_str(hdr_status));
 992         }
 993
 994         fnic_release_ioreq_buf(fnic, io_req, sc);
 995
 996         mempool_free(io_req, fnic->io_req_pool);
 997
 998         cmd_trace = ((u64)hdr_status << 56) |
 999                   (u64)icmnd_cmpl->scsi_status << 48 |
1000                   (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
1001                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1002                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
1003
1004         FNIC_TRACE(fnic_fcpio_icmnd_cmpl_handler,
1005                   sc->device->host->host_no, id, sc,
1006                   ((u64)icmnd_cmpl->_resvd0[1] << 56 |
1007                   (u64)icmnd_cmpl->_resvd0[0] << 48 |
1008                   jiffies_to_msecs(jiffies - start_time)),
1009                   desc, cmd_trace,
1010                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1011
1012         if (sc->sc_data_direction == DMA_FROM_DEVICE) {
1013                 fnic->lport->host_stats.fcp_input_requests++;
1014                 fnic->fcp_input_bytes += xfer_len;
1015         } else if (sc->sc_data_direction == DMA_TO_DEVICE) {
1016                 fnic->lport->host_stats.fcp_output_requests++;
1017                 fnic->fcp_output_bytes += xfer_len;
1018         } else
1019                 fnic->lport->host_stats.fcp_control_requests++;
1020
1021         atomic64_dec(&fnic_stats->io_stats.active_ios);
1022         if (atomic64_read(&fnic->io_cmpl_skip))
1023                 atomic64_dec(&fnic->io_cmpl_skip);
1024         else
1025                 atomic64_inc(&fnic_stats->io_stats.io_completions);
1026
1027
1028         io_duration_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1029
1030         if(io_duration_time <= 10)
1031                 atomic64_inc(&fnic_stats->io_stats.io_btw_0_to_10_msec);
1032         else if(io_duration_time <= 100)
1033                 atomic64_inc(&fnic_stats->io_stats.io_btw_10_to_100_msec);
1034         else if(io_duration_time <= 500)
1035                 atomic64_inc(&fnic_stats->io_stats.io_btw_100_to_500_msec);
1036         else if(io_duration_time <= 5000)
1037                 atomic64_inc(&fnic_stats->io_stats.io_btw_500_to_5000_msec);
1038         else if(io_duration_time <= 10000)
1039                 atomic64_inc(&fnic_stats->io_stats.io_btw_5000_to_10000_msec);
1040         else if(io_duration_time <= 30000)
1041                 atomic64_inc(&fnic_stats->io_stats.io_btw_10000_to_30000_msec);
1042         else {
1043                 atomic64_inc(&fnic_stats->io_stats.io_greater_than_30000_msec);
1044
1045                 if(io_duration_time > atomic64_read(&fnic_stats->io_stats.current_max_io_time))
1046                         atomic64_set(&fnic_stats->io_stats.current_max_io_time, io_duration_time);
1047         }
1048
1049         /* Call SCSI completion function to complete the IO */
1050         if (sc->scsi_done)
1051                 sc->scsi_done(sc);
1052 }
1053
1054 /* fnic_fcpio_itmf_cmpl_handler
1055  * Routine to handle itmf completions
1056  */
1057 static void fnic_fcpio_itmf_cmpl_handler(struct fnic *fnic,
1058                                         struct fcpio_fw_req *desc)
1059 {
1060         u8 type;
1061         u8 hdr_status;
1062         struct fcpio_tag tag;
1063         u32 id;
1064         struct scsi_cmnd *sc;
1065         struct fnic_io_req *io_req;
1066         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1067         struct abort_stats *abts_stats = &fnic->fnic_stats.abts_stats;
1068         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1069         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1070         unsigned long flags;
1071         spinlock_t *io_lock;
1072         unsigned long start_time;
1073
1074         fcpio_header_dec(&desc->hdr, &type, &hdr_status, &tag);
1075         fcpio_tag_id_dec(&tag, &id);
1076
1077         if ((id & FNIC_TAG_MASK) >= fnic->fnic_max_tag_id) {
1078                 shost_printk(KERN_ERR, fnic->lport->host,
1079                 "Tag out of range tag %x hdr status = %s\n",
1080                 id, fnic_fcpio_status_to_str(hdr_status));
1081                 return;
1082         }
1083
1084         sc = scsi_host_find_tag(fnic->lport->host, id & FNIC_TAG_MASK);
1085         WARN_ON_ONCE(!sc);
1086         if (!sc) {
1087                 atomic64_inc(&fnic_stats->io_stats.sc_null);
1088                 shost_printk(KERN_ERR, fnic->lport->host,
1089                           "itmf_cmpl sc is null - hdr status = %s tag = 0x%x\n",
1090                           fnic_fcpio_status_to_str(hdr_status), id);
1091                 return;
1092         }
1093         io_lock = fnic_io_lock_hash(fnic, sc);
1094         spin_lock_irqsave(io_lock, flags);
1095         io_req = (struct fnic_io_req *)CMD_SP(sc);
1096         WARN_ON_ONCE(!io_req);
1097         if (!io_req) {
1098                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1099                 spin_unlock_irqrestore(io_lock, flags);
1100                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1101                 shost_printk(KERN_ERR, fnic->lport->host,
1102                           "itmf_cmpl io_req is null - "
1103                           "hdr status = %s tag = 0x%x sc 0x%p\n",
1104                           fnic_fcpio_status_to_str(hdr_status), id, sc);
1105                 return;
1106         }
1107         start_time = io_req->start_time;
1108
1109         if ((id & FNIC_TAG_ABORT) && (id & FNIC_TAG_DEV_RST)) {
1110                 /* Abort and terminate completion of device reset req */
1111                 /* REVISIT : Add asserts about various flags */
1112                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1113                               "dev reset abts cmpl recd. id %x status %s\n",
1114                               id, fnic_fcpio_status_to_str(hdr_status));
1115                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1116                 CMD_ABTS_STATUS(sc) = hdr_status;
1117                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1118                 if (io_req->abts_done)
1119                         complete(io_req->abts_done);
1120                 spin_unlock_irqrestore(io_lock, flags);
1121         } else if (id & FNIC_TAG_ABORT) {
1122                 /* Completion of abort cmd */
1123                 switch (hdr_status) {
1124                 case FCPIO_SUCCESS:
1125                         break;
1126                 case FCPIO_TIMEOUT:
1127                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1128                                 atomic64_inc(&abts_stats->abort_fw_timeouts);
1129                         else
1130                                 atomic64_inc(
1131                                         &term_stats->terminate_fw_timeouts);
1132                         break;
1133                 case FCPIO_ITMF_REJECTED:
1134                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1135                                 "abort reject recd. id %d\n",
1136                                 (int)(id & FNIC_TAG_MASK));
1137                         break;
1138                 case FCPIO_IO_NOT_FOUND:
1139                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1140                                 atomic64_inc(&abts_stats->abort_io_not_found);
1141                         else
1142                                 atomic64_inc(
1143                                         &term_stats->terminate_io_not_found);
1144                         break;
1145                 default:
1146                         if (CMD_FLAGS(sc) & FNIC_IO_ABTS_ISSUED)
1147                                 atomic64_inc(&abts_stats->abort_failures);
1148                         else
1149                                 atomic64_inc(
1150                                         &term_stats->terminate_failures);
1151                         break;
1152                 }
1153                 if (CMD_STATE(sc) != FNIC_IOREQ_ABTS_PENDING) {
1154                         /* This is a late completion. Ignore it */
1155                         spin_unlock_irqrestore(io_lock, flags);
1156                         return;
1157                 }
1158
1159                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
1160                 CMD_ABTS_STATUS(sc) = hdr_status;
1161
1162                 /* If the status is IO not found consider it as success */
1163                 if (hdr_status == FCPIO_IO_NOT_FOUND)
1164                         CMD_ABTS_STATUS(sc) = FCPIO_SUCCESS;
1165
1166                 if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE)))
1167                         atomic64_inc(&misc_stats->no_icmnd_itmf_cmpls);
1168
1169                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1170                               "abts cmpl recd. id %d status %s\n",
1171                               (int)(id & FNIC_TAG_MASK),
1172                               fnic_fcpio_status_to_str(hdr_status));
1173
1174                 /*
1175                  * If scsi_eh thread is blocked waiting for abts to complete,
1176                  * signal completion to it. IO will be cleaned in the thread
1177                  * else clean it in this context
1178                  */
1179                 if (io_req->abts_done) {
1180                         complete(io_req->abts_done);
1181                         spin_unlock_irqrestore(io_lock, flags);
1182                 } else {
1183                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1184                                       "abts cmpl, completing IO\n");
1185                         CMD_SP(sc) = NULL;
1186                         sc->result = (DID_ERROR << 16);
1187
1188                         spin_unlock_irqrestore(io_lock, flags);
1189
1190                         fnic_release_ioreq_buf(fnic, io_req, sc);
1191                         mempool_free(io_req, fnic->io_req_pool);
1192                         if (sc->scsi_done) {
1193                                 FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1194                                         sc->device->host->host_no, id,
1195                                         sc,
1196                                         jiffies_to_msecs(jiffies - start_time),
1197                                         desc,
1198                                         (((u64)hdr_status << 40) |
1199                                         (u64)sc->cmnd[0] << 32 |
1200                                         (u64)sc->cmnd[2] << 24 |
1201                                         (u64)sc->cmnd[3] << 16 |
1202                                         (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1203                                         (((u64)CMD_FLAGS(sc) << 32) |
1204                                         CMD_STATE(sc)));
1205                                 sc->scsi_done(sc);
1206                                 atomic64_dec(&fnic_stats->io_stats.active_ios);
1207                                 if (atomic64_read(&fnic->io_cmpl_skip))
1208                                         atomic64_dec(&fnic->io_cmpl_skip);
1209                                 else
1210                                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1211                         }
1212                 }
1213
1214         } else if (id & FNIC_TAG_DEV_RST) {
1215                 /* Completion of device reset */
1216                 CMD_LR_STATUS(sc) = hdr_status;
1217                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1218                         spin_unlock_irqrestore(io_lock, flags);
1219                         CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
1220                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1221                                   sc->device->host->host_no, id, sc,
1222                                   jiffies_to_msecs(jiffies - start_time),
1223                                   desc, 0,
1224                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1225                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1226                                 "Terminate pending "
1227                                 "dev reset cmpl recd. id %d status %s\n",
1228                                 (int)(id & FNIC_TAG_MASK),
1229                                 fnic_fcpio_status_to_str(hdr_status));
1230                         return;
1231                 }
1232                 if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
1233                         /* Need to wait for terminate completion */
1234                         spin_unlock_irqrestore(io_lock, flags);
1235                         FNIC_TRACE(fnic_fcpio_itmf_cmpl_handler,
1236                                   sc->device->host->host_no, id, sc,
1237                                   jiffies_to_msecs(jiffies - start_time),
1238                                   desc, 0,
1239                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1240                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1241                                 "dev reset cmpl recd after time out. "
1242                                 "id %d status %s\n",
1243                                 (int)(id & FNIC_TAG_MASK),
1244                                 fnic_fcpio_status_to_str(hdr_status));
1245                         return;
1246                 }
1247                 CMD_STATE(sc) = FNIC_IOREQ_CMD_COMPLETE;
1248                 CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1249                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1250                               "dev reset cmpl recd. id %d status %s\n",
1251                               (int)(id & FNIC_TAG_MASK),
1252                               fnic_fcpio_status_to_str(hdr_status));
1253                 if (io_req->dr_done)
1254                         complete(io_req->dr_done);
1255                 spin_unlock_irqrestore(io_lock, flags);
1256
1257         } else {
1258                 shost_printk(KERN_ERR, fnic->lport->host,
1259                              "Unexpected itmf io state %s tag %x\n",
1260                              fnic_ioreq_state_to_str(CMD_STATE(sc)), id);
1261                 spin_unlock_irqrestore(io_lock, flags);
1262         }
1263
1264 }
1265
1266 /*
1267  * fnic_fcpio_cmpl_handler
1268  * Routine to service the cq for wq_copy
1269  */
1270 static int fnic_fcpio_cmpl_handler(struct vnic_dev *vdev,
1271                                    unsigned int cq_index,
1272                                    struct fcpio_fw_req *desc)
1273 {
1274         struct fnic *fnic = vnic_dev_priv(vdev);
1275
1276         switch (desc->hdr.type) {
1277         case FCPIO_ICMND_CMPL: /* fw completed a command */
1278         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1279         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1280         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1281         case FCPIO_RESET_CMPL: /* fw completed reset */
1282                 atomic64_dec(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1283                 break;
1284         default:
1285                 break;
1286         }
1287
1288         switch (desc->hdr.type) {
1289         case FCPIO_ACK: /* fw copied copy wq desc to its queue */
1290                 fnic_fcpio_ack_handler(fnic, cq_index, desc);
1291                 break;
1292
1293         case FCPIO_ICMND_CMPL: /* fw completed a command */
1294                 fnic_fcpio_icmnd_cmpl_handler(fnic, desc);
1295                 break;
1296
1297         case FCPIO_ITMF_CMPL: /* fw completed itmf (abort cmd, lun reset)*/
1298                 fnic_fcpio_itmf_cmpl_handler(fnic, desc);
1299                 break;
1300
1301         case FCPIO_FLOGI_REG_CMPL: /* fw completed flogi_reg */
1302         case FCPIO_FLOGI_FIP_REG_CMPL: /* fw completed flogi_fip_reg */
1303                 fnic_fcpio_flogi_reg_cmpl_handler(fnic, desc);
1304                 break;
1305
1306         case FCPIO_RESET_CMPL: /* fw completed reset */
1307                 fnic_fcpio_fw_reset_cmpl_handler(fnic, desc);
1308                 break;
1309
1310         default:
1311                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1312                               "firmware completion type %d\n",
1313                               desc->hdr.type);
1314                 break;
1315         }
1316
1317         return 0;
1318 }
1319
1320 /*
1321  * fnic_wq_copy_cmpl_handler
1322  * Routine to process wq copy
1323  */
1324 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do)
1325 {
1326         unsigned int wq_work_done = 0;
1327         unsigned int i, cq_index;
1328         unsigned int cur_work_done;
1329
1330         for (i = 0; i < fnic->wq_copy_count; i++) {
1331                 cq_index = i + fnic->raw_wq_count + fnic->rq_count;
1332                 cur_work_done = vnic_cq_copy_service(&fnic->cq[cq_index],
1333                                                      fnic_fcpio_cmpl_handler,
1334                                                      copy_work_to_do);
1335                 wq_work_done += cur_work_done;
1336         }
1337         return wq_work_done;
1338 }
1339
1340 static void fnic_cleanup_io(struct fnic *fnic, int exclude_id)
1341 {
1342         int i;
1343         struct fnic_io_req *io_req;
1344         unsigned long flags = 0;
1345         struct scsi_cmnd *sc;
1346         spinlock_t *io_lock;
1347         unsigned long start_time = 0;
1348         struct fnic_stats *fnic_stats = &fnic->fnic_stats;
1349
1350         for (i = 0; i < fnic->fnic_max_tag_id; i++) {
1351                 if (i == exclude_id)
1352                         continue;
1353
1354                 io_lock = fnic_io_lock_tag(fnic, i);
1355                 spin_lock_irqsave(io_lock, flags);
1356                 sc = scsi_host_find_tag(fnic->lport->host, i);
1357                 if (!sc) {
1358                         spin_unlock_irqrestore(io_lock, flags);
1359                         continue;
1360                 }
1361
1362                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1363                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1364                         !(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
1365                         /*
1366                          * We will be here only when FW completes reset
1367                          * without sending completions for outstanding ios.
1368                          */
1369                         CMD_FLAGS(sc) |= FNIC_DEV_RST_DONE;
1370                         if (io_req && io_req->dr_done)
1371                                 complete(io_req->dr_done);
1372                         else if (io_req && io_req->abts_done)
1373                                 complete(io_req->abts_done);
1374                         spin_unlock_irqrestore(io_lock, flags);
1375                         continue;
1376                 } else if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1377                         spin_unlock_irqrestore(io_lock, flags);
1378                         continue;
1379                 }
1380                 if (!io_req) {
1381                         spin_unlock_irqrestore(io_lock, flags);
1382                         goto cleanup_scsi_cmd;
1383                 }
1384
1385                 CMD_SP(sc) = NULL;
1386
1387                 spin_unlock_irqrestore(io_lock, flags);
1388
1389                 /*
1390                  * If there is a scsi_cmnd associated with this io_req, then
1391                  * free the corresponding state
1392                  */
1393                 start_time = io_req->start_time;
1394                 fnic_release_ioreq_buf(fnic, io_req, sc);
1395                 mempool_free(io_req, fnic->io_req_pool);
1396
1397 cleanup_scsi_cmd:
1398                 sc->result = DID_TRANSPORT_DISRUPTED << 16;
1399                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1400                               "%s: sc duration = %lu DID_TRANSPORT_DISRUPTED\n",
1401                               __func__, (jiffies - start_time));
1402
1403                 if (atomic64_read(&fnic->io_cmpl_skip))
1404                         atomic64_dec(&fnic->io_cmpl_skip);
1405                 else
1406                         atomic64_inc(&fnic_stats->io_stats.io_completions);
1407
1408                 /* Complete the command to SCSI */
1409                 if (sc->scsi_done) {
1410                         FNIC_TRACE(fnic_cleanup_io,
1411                                   sc->device->host->host_no, i, sc,
1412                                   jiffies_to_msecs(jiffies - start_time),
1413                                   0, ((u64)sc->cmnd[0] << 32 |
1414                                   (u64)sc->cmnd[2] << 24 |
1415                                   (u64)sc->cmnd[3] << 16 |
1416                                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1417                                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1418
1419                         sc->scsi_done(sc);
1420                 }
1421         }
1422 }
1423
1424 void fnic_wq_copy_cleanup_handler(struct vnic_wq_copy *wq,
1425                                   struct fcpio_host_req *desc)
1426 {
1427         u32 id;
1428         struct fnic *fnic = vnic_dev_priv(wq->vdev);
1429         struct fnic_io_req *io_req;
1430         struct scsi_cmnd *sc;
1431         unsigned long flags;
1432         spinlock_t *io_lock;
1433         unsigned long start_time = 0;
1434
1435         /* get the tag reference */
1436         fcpio_tag_id_dec(&desc->hdr.tag, &id);
1437         id &= FNIC_TAG_MASK;
1438
1439         if (id >= fnic->fnic_max_tag_id)
1440                 return;
1441
1442         sc = scsi_host_find_tag(fnic->lport->host, id);
1443         if (!sc)
1444                 return;
1445
1446         io_lock = fnic_io_lock_hash(fnic, sc);
1447         spin_lock_irqsave(io_lock, flags);
1448
1449         /* Get the IO context which this desc refers to */
1450         io_req = (struct fnic_io_req *)CMD_SP(sc);
1451
1452         /* fnic interrupts are turned off by now */
1453
1454         if (!io_req) {
1455                 spin_unlock_irqrestore(io_lock, flags);
1456                 goto wq_copy_cleanup_scsi_cmd;
1457         }
1458
1459         CMD_SP(sc) = NULL;
1460
1461         spin_unlock_irqrestore(io_lock, flags);
1462
1463         start_time = io_req->start_time;
1464         fnic_release_ioreq_buf(fnic, io_req, sc);
1465         mempool_free(io_req, fnic->io_req_pool);
1466
1467 wq_copy_cleanup_scsi_cmd:
1468         sc->result = DID_NO_CONNECT << 16;
1469         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
1470                       " DID_NO_CONNECT\n");
1471
1472         if (sc->scsi_done) {
1473                 FNIC_TRACE(fnic_wq_copy_cleanup_handler,
1474                           sc->device->host->host_no, id, sc,
1475                           jiffies_to_msecs(jiffies - start_time),
1476                           0, ((u64)sc->cmnd[0] << 32 |
1477                           (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
1478                           (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
1479                           (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
1480
1481                 sc->scsi_done(sc);
1482         }
1483 }
1484
1485 static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
1486                                           u32 task_req, u8 *fc_lun,
1487                                           struct fnic_io_req *io_req)
1488 {
1489         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
1490         struct Scsi_Host *host = fnic->lport->host;
1491         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
1492         unsigned long flags;
1493
1494         spin_lock_irqsave(host->host_lock, flags);
1495         if (unlikely(fnic_chk_state_flags_locked(fnic,
1496                                                 FNIC_FLAGS_IO_BLOCKED))) {
1497                 spin_unlock_irqrestore(host->host_lock, flags);
1498                 return 1;
1499         } else
1500                 atomic_inc(&fnic->in_flight);
1501         spin_unlock_irqrestore(host->host_lock, flags);
1502
1503         spin_lock_irqsave(&fnic->wq_copy_lock[0], flags);
1504
1505         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
1506                 free_wq_copy_descs(fnic, wq);
1507
1508         if (!vnic_wq_copy_desc_avail(wq)) {
1509                 spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1510                 atomic_dec(&fnic->in_flight);
1511                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1512                         "fnic_queue_abort_io_req: failure: no descriptors\n");
1513                 atomic64_inc(&misc_stats->abts_cpwq_alloc_failures);
1514                 return 1;
1515         }
1516         fnic_queue_wq_copy_desc_itmf(wq, tag | FNIC_TAG_ABORT,
1517                                      0, task_req, tag, fc_lun, io_req->port_id,
1518                                      fnic->config.ra_tov, fnic->config.ed_tov);
1519
1520         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
1521         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
1522                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
1523                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
1524                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
1525
1526         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
1527         atomic_dec(&fnic->in_flight);
1528
1529         return 0;
1530 }
1531
1532 static void fnic_rport_exch_reset(struct fnic *fnic, u32 port_id)
1533 {
1534         int tag;
1535         int abt_tag;
1536         int term_cnt = 0;
1537         struct fnic_io_req *io_req;
1538         spinlock_t *io_lock;
1539         unsigned long flags;
1540         struct scsi_cmnd *sc;
1541         struct reset_stats *reset_stats = &fnic->fnic_stats.reset_stats;
1542         struct terminate_stats *term_stats = &fnic->fnic_stats.term_stats;
1543         struct scsi_lun fc_lun;
1544         enum fnic_ioreq_state old_ioreq_state;
1545
1546         FNIC_SCSI_DBG(KERN_DEBUG,
1547                       fnic->lport->host,
1548                       "fnic_rport_exch_reset called portid 0x%06x\n",
1549                       port_id);
1550
1551         if (fnic->in_remove)
1552                 return;
1553
1554         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1555                 abt_tag = tag;
1556                 io_lock = fnic_io_lock_tag(fnic, tag);
1557                 spin_lock_irqsave(io_lock, flags);
1558                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1559                 if (!sc) {
1560                         spin_unlock_irqrestore(io_lock, flags);
1561                         continue;
1562                 }
1563
1564                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1565
1566                 if (!io_req || io_req->port_id != port_id) {
1567                         spin_unlock_irqrestore(io_lock, flags);
1568                         continue;
1569                 }
1570
1571                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1572                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1573                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1574                         "fnic_rport_exch_reset dev rst not pending sc 0x%p\n",
1575                         sc);
1576                         spin_unlock_irqrestore(io_lock, flags);
1577                         continue;
1578                 }
1579
1580                 /*
1581                  * Found IO that is still pending with firmware and
1582                  * belongs to rport that went away
1583                  */
1584                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1585                         spin_unlock_irqrestore(io_lock, flags);
1586                         continue;
1587                 }
1588                 if (io_req->abts_done) {
1589                         shost_printk(KERN_ERR, fnic->lport->host,
1590                         "fnic_rport_exch_reset: io_req->abts_done is set "
1591                         "state is %s\n",
1592                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1593                 }
1594
1595                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1596                         shost_printk(KERN_ERR, fnic->lport->host,
1597                                   "rport_exch_reset "
1598                                   "IO not yet issued %p tag 0x%x flags "
1599                                   "%x state %d\n",
1600                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1601                 }
1602                 old_ioreq_state = CMD_STATE(sc);
1603                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1604                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1605                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1606                         atomic64_inc(&reset_stats->device_reset_terminates);
1607                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1608                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1609                         "fnic_rport_exch_reset dev rst sc 0x%p\n",
1610                         sc);
1611                 }
1612
1613                 BUG_ON(io_req->abts_done);
1614
1615                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1616                               "fnic_rport_reset_exch: Issuing abts\n");
1617
1618                 spin_unlock_irqrestore(io_lock, flags);
1619
1620                 /* Now queue the abort command to firmware */
1621                 int_to_scsilun(sc->device->lun, &fc_lun);
1622
1623                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1624                                             FCPIO_ITMF_ABT_TASK_TERM,
1625                                             fc_lun.scsi_lun, io_req)) {
1626                         /*
1627                          * Revert the cmd state back to old state, if
1628                          * it hasn't changed in between. This cmd will get
1629                          * aborted later by scsi_eh, or cleaned up during
1630                          * lun reset
1631                          */
1632                         spin_lock_irqsave(io_lock, flags);
1633                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1634                                 CMD_STATE(sc) = old_ioreq_state;
1635                         spin_unlock_irqrestore(io_lock, flags);
1636                 } else {
1637                         spin_lock_irqsave(io_lock, flags);
1638                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1639                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1640                         else
1641                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1642                         spin_unlock_irqrestore(io_lock, flags);
1643                         atomic64_inc(&term_stats->terminates);
1644                         term_cnt++;
1645                 }
1646         }
1647         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1648                 atomic64_set(&term_stats->max_terminates, term_cnt);
1649
1650 }
1651
1652 void fnic_terminate_rport_io(struct fc_rport *rport)
1653 {
1654         int tag;
1655         int abt_tag;
1656         int term_cnt = 0;
1657         struct fnic_io_req *io_req;
1658         spinlock_t *io_lock;
1659         unsigned long flags;
1660         struct scsi_cmnd *sc;
1661         struct scsi_lun fc_lun;
1662         struct fc_rport_libfc_priv *rdata;
1663         struct fc_lport *lport;
1664         struct fnic *fnic;
1665         struct fc_rport *cmd_rport;
1666         struct reset_stats *reset_stats;
1667         struct terminate_stats *term_stats;
1668         enum fnic_ioreq_state old_ioreq_state;
1669
1670         if (!rport) {
1671                 printk(KERN_ERR "fnic_terminate_rport_io: rport is NULL\n");
1672                 return;
1673         }
1674         rdata = rport->dd_data;
1675
1676         if (!rdata) {
1677                 printk(KERN_ERR "fnic_terminate_rport_io: rdata is NULL\n");
1678                 return;
1679         }
1680         lport = rdata->local_port;
1681
1682         if (!lport) {
1683                 printk(KERN_ERR "fnic_terminate_rport_io: lport is NULL\n");
1684                 return;
1685         }
1686         fnic = lport_priv(lport);
1687         FNIC_SCSI_DBG(KERN_DEBUG,
1688                       fnic->lport->host, "fnic_terminate_rport_io called"
1689                       " wwpn 0x%llx, wwnn0x%llx, rport 0x%p, portid 0x%06x\n",
1690                       rport->port_name, rport->node_name, rport,
1691                       rport->port_id);
1692
1693         if (fnic->in_remove)
1694                 return;
1695
1696         reset_stats = &fnic->fnic_stats.reset_stats;
1697         term_stats = &fnic->fnic_stats.term_stats;
1698
1699         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
1700                 abt_tag = tag;
1701                 io_lock = fnic_io_lock_tag(fnic, tag);
1702                 spin_lock_irqsave(io_lock, flags);
1703                 sc = scsi_host_find_tag(fnic->lport->host, tag);
1704                 if (!sc) {
1705                         spin_unlock_irqrestore(io_lock, flags);
1706                         continue;
1707                 }
1708
1709                 cmd_rport = starget_to_rport(scsi_target(sc->device));
1710                 if (rport != cmd_rport) {
1711                         spin_unlock_irqrestore(io_lock, flags);
1712                         continue;
1713                 }
1714
1715                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1716
1717                 if (!io_req || rport != cmd_rport) {
1718                         spin_unlock_irqrestore(io_lock, flags);
1719                         continue;
1720                 }
1721
1722                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
1723                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
1724                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1725                         "fnic_terminate_rport_io dev rst not pending sc 0x%p\n",
1726                         sc);
1727                         spin_unlock_irqrestore(io_lock, flags);
1728                         continue;
1729                 }
1730                 /*
1731                  * Found IO that is still pending with firmware and
1732                  * belongs to rport that went away
1733                  */
1734                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1735                         spin_unlock_irqrestore(io_lock, flags);
1736                         continue;
1737                 }
1738                 if (io_req->abts_done) {
1739                         shost_printk(KERN_ERR, fnic->lport->host,
1740                         "fnic_terminate_rport_io: io_req->abts_done is set "
1741                         "state is %s\n",
1742                         fnic_ioreq_state_to_str(CMD_STATE(sc)));
1743                 }
1744                 if (!(CMD_FLAGS(sc) & FNIC_IO_ISSUED)) {
1745                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1746                                   "fnic_terminate_rport_io "
1747                                   "IO not yet issued %p tag 0x%x flags "
1748                                   "%x state %d\n",
1749                                   sc, tag, CMD_FLAGS(sc), CMD_STATE(sc));
1750                 }
1751                 old_ioreq_state = CMD_STATE(sc);
1752                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1753                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1754                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
1755                         atomic64_inc(&reset_stats->device_reset_terminates);
1756                         abt_tag = (tag | FNIC_TAG_DEV_RST);
1757                         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1758                         "fnic_terminate_rport_io dev rst sc 0x%p\n", sc);
1759                 }
1760
1761                 BUG_ON(io_req->abts_done);
1762
1763                 FNIC_SCSI_DBG(KERN_DEBUG,
1764                               fnic->lport->host,
1765                               "fnic_terminate_rport_io: Issuing abts\n");
1766
1767                 spin_unlock_irqrestore(io_lock, flags);
1768
1769                 /* Now queue the abort command to firmware */
1770                 int_to_scsilun(sc->device->lun, &fc_lun);
1771
1772                 if (fnic_queue_abort_io_req(fnic, abt_tag,
1773                                             FCPIO_ITMF_ABT_TASK_TERM,
1774                                             fc_lun.scsi_lun, io_req)) {
1775                         /*
1776                          * Revert the cmd state back to old state, if
1777                          * it hasn't changed in between. This cmd will get
1778                          * aborted later by scsi_eh, or cleaned up during
1779                          * lun reset
1780                          */
1781                         spin_lock_irqsave(io_lock, flags);
1782                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1783                                 CMD_STATE(sc) = old_ioreq_state;
1784                         spin_unlock_irqrestore(io_lock, flags);
1785                 } else {
1786                         spin_lock_irqsave(io_lock, flags);
1787                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
1788                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
1789                         else
1790                                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
1791                         spin_unlock_irqrestore(io_lock, flags);
1792                         atomic64_inc(&term_stats->terminates);
1793                         term_cnt++;
1794                 }
1795         }
1796         if (term_cnt > atomic64_read(&term_stats->max_terminates))
1797                 atomic64_set(&term_stats->max_terminates, term_cnt);
1798
1799 }
1800
1801 /*
1802  * This function is exported to SCSI for sending abort cmnds.
1803  * A SCSI IO is represented by a io_req in the driver.
1804  * The ioreq is linked to the SCSI Cmd, thus a link with the ULP's IO.
1805  */
1806 int fnic_abort_cmd(struct scsi_cmnd *sc)
1807 {
1808         struct fc_lport *lp;
1809         struct fnic *fnic;
1810         struct fnic_io_req *io_req = NULL;
1811         struct fc_rport *rport;
1812         spinlock_t *io_lock;
1813         unsigned long flags;
1814         unsigned long start_time = 0;
1815         int ret = SUCCESS;
1816         u32 task_req = 0;
1817         struct scsi_lun fc_lun;
1818         struct fnic_stats *fnic_stats;
1819         struct abort_stats *abts_stats;
1820         struct terminate_stats *term_stats;
1821         enum fnic_ioreq_state old_ioreq_state;
1822         int tag;
1823         unsigned long abt_issued_time;
1824         DECLARE_COMPLETION_ONSTACK(tm_done);
1825
1826         /* Wait for rport to unblock */
1827         fc_block_scsi_eh(sc);
1828
1829         /* Get local-port, check ready and link up */
1830         lp = shost_priv(sc->device->host);
1831
1832         fnic = lport_priv(lp);
1833         fnic_stats = &fnic->fnic_stats;
1834         abts_stats = &fnic->fnic_stats.abts_stats;
1835         term_stats = &fnic->fnic_stats.term_stats;
1836
1837         rport = starget_to_rport(scsi_target(sc->device));
1838         tag = sc->request->tag;
1839         FNIC_SCSI_DBG(KERN_DEBUG,
1840                 fnic->lport->host,
1841                 "Abort Cmd called FCID 0x%x, LUN 0x%llx TAG %x flags %x\n",
1842                 rport->port_id, sc->device->lun, tag, CMD_FLAGS(sc));
1843
1844         CMD_FLAGS(sc) = FNIC_NO_FLAGS;
1845
1846         if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
1847                 ret = FAILED;
1848                 goto fnic_abort_cmd_end;
1849         }
1850
1851         /*
1852          * Avoid a race between SCSI issuing the abort and the device
1853          * completing the command.
1854          *
1855          * If the command is already completed by the fw cmpl code,
1856          * we just return SUCCESS from here. This means that the abort
1857          * succeeded. In the SCSI ML, since the timeout for command has
1858          * happened, the completion wont actually complete the command
1859          * and it will be considered as an aborted command
1860          *
1861          * The CMD_SP will not be cleared except while holding io_req_lock.
1862          */
1863         io_lock = fnic_io_lock_hash(fnic, sc);
1864         spin_lock_irqsave(io_lock, flags);
1865         io_req = (struct fnic_io_req *)CMD_SP(sc);
1866         if (!io_req) {
1867                 spin_unlock_irqrestore(io_lock, flags);
1868                 goto fnic_abort_cmd_end;
1869         }
1870
1871         io_req->abts_done = &tm_done;
1872
1873         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
1874                 spin_unlock_irqrestore(io_lock, flags);
1875                 goto wait_pending;
1876         }
1877
1878         abt_issued_time = jiffies_to_msecs(jiffies) - jiffies_to_msecs(io_req->start_time);
1879         if (abt_issued_time <= 6000)
1880                 atomic64_inc(&abts_stats->abort_issued_btw_0_to_6_sec);
1881         else if (abt_issued_time > 6000 && abt_issued_time <= 20000)
1882                 atomic64_inc(&abts_stats->abort_issued_btw_6_to_20_sec);
1883         else if (abt_issued_time > 20000 && abt_issued_time <= 30000)
1884                 atomic64_inc(&abts_stats->abort_issued_btw_20_to_30_sec);
1885         else if (abt_issued_time > 30000 && abt_issued_time <= 40000)
1886                 atomic64_inc(&abts_stats->abort_issued_btw_30_to_40_sec);
1887         else if (abt_issued_time > 40000 && abt_issued_time <= 50000)
1888                 atomic64_inc(&abts_stats->abort_issued_btw_40_to_50_sec);
1889         else if (abt_issued_time > 50000 && abt_issued_time <= 60000)
1890                 atomic64_inc(&abts_stats->abort_issued_btw_50_to_60_sec);
1891         else
1892                 atomic64_inc(&abts_stats->abort_issued_greater_than_60_sec);
1893
1894         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
1895                 "CBD Opcode: %02x Abort issued time: %lu msec\n", sc->cmnd[0], abt_issued_time);
1896         /*
1897          * Command is still pending, need to abort it
1898          * If the firmware completes the command after this point,
1899          * the completion wont be done till mid-layer, since abort
1900          * has already started.
1901          */
1902         old_ioreq_state = CMD_STATE(sc);
1903         CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
1904         CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
1905
1906         spin_unlock_irqrestore(io_lock, flags);
1907
1908         /*
1909          * Check readiness of the remote port. If the path to remote
1910          * port is up, then send abts to the remote port to terminate
1911          * the IO. Else, just locally terminate the IO in the firmware
1912          */
1913         if (fc_remote_port_chkready(rport) == 0)
1914                 task_req = FCPIO_ITMF_ABT_TASK;
1915         else {
1916                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
1917                 task_req = FCPIO_ITMF_ABT_TASK_TERM;
1918         }
1919
1920         /* Now queue the abort command to firmware */
1921         int_to_scsilun(sc->device->lun, &fc_lun);
1922
1923         if (fnic_queue_abort_io_req(fnic, sc->request->tag, task_req,
1924                                     fc_lun.scsi_lun, io_req)) {
1925                 spin_lock_irqsave(io_lock, flags);
1926                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
1927                         CMD_STATE(sc) = old_ioreq_state;
1928                 io_req = (struct fnic_io_req *)CMD_SP(sc);
1929                 if (io_req)
1930                         io_req->abts_done = NULL;
1931                 spin_unlock_irqrestore(io_lock, flags);
1932                 ret = FAILED;
1933                 goto fnic_abort_cmd_end;
1934         }
1935         if (task_req == FCPIO_ITMF_ABT_TASK) {
1936                 CMD_FLAGS(sc) |= FNIC_IO_ABTS_ISSUED;
1937                 atomic64_inc(&fnic_stats->abts_stats.aborts);
1938         } else {
1939                 CMD_FLAGS(sc) |= FNIC_IO_TERM_ISSUED;
1940                 atomic64_inc(&fnic_stats->term_stats.terminates);
1941         }
1942
1943         /*
1944          * We queued an abort IO, wait for its completion.
1945          * Once the firmware completes the abort command, it will
1946          * wake up this thread.
1947          */
1948  wait_pending:
1949         wait_for_completion_timeout(&tm_done,
1950                                     msecs_to_jiffies
1951                                     (2 * fnic->config.ra_tov +
1952                                      fnic->config.ed_tov));
1953
1954         /* Check the abort status */
1955         spin_lock_irqsave(io_lock, flags);
1956
1957         io_req = (struct fnic_io_req *)CMD_SP(sc);
1958         if (!io_req) {
1959                 atomic64_inc(&fnic_stats->io_stats.ioreq_null);
1960                 spin_unlock_irqrestore(io_lock, flags);
1961                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
1962                 ret = FAILED;
1963                 goto fnic_abort_cmd_end;
1964         }
1965         io_req->abts_done = NULL;
1966
1967         /* fw did not complete abort, timed out */
1968         if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
1969                 spin_unlock_irqrestore(io_lock, flags);
1970                 if (task_req == FCPIO_ITMF_ABT_TASK) {
1971                         atomic64_inc(&abts_stats->abort_drv_timeouts);
1972                 } else {
1973                         atomic64_inc(&term_stats->terminate_drv_timeouts);
1974                 }
1975                 CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_TIMED_OUT;
1976                 ret = FAILED;
1977                 goto fnic_abort_cmd_end;
1978         }
1979
1980         /* IO out of order */
1981
1982         if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
1983                 spin_unlock_irqrestore(io_lock, flags);
1984                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
1985                         "Issuing Host reset due to out of order IO\n");
1986
1987                 ret = FAILED;
1988                 goto fnic_abort_cmd_end;
1989         }
1990
1991         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
1992
1993         start_time = io_req->start_time;
1994         /*
1995          * firmware completed the abort, check the status,
1996          * free the io_req if successful. If abort fails,
1997          * Device reset will clean the I/O.
1998          */
1999         if (CMD_ABTS_STATUS(sc) == FCPIO_SUCCESS)
2000                 CMD_SP(sc) = NULL;
2001         else {
2002                 ret = FAILED;
2003                 spin_unlock_irqrestore(io_lock, flags);
2004                 goto fnic_abort_cmd_end;
2005         }
2006
2007         spin_unlock_irqrestore(io_lock, flags);
2008
2009         fnic_release_ioreq_buf(fnic, io_req, sc);
2010         mempool_free(io_req, fnic->io_req_pool);
2011
2012         if (sc->scsi_done) {
2013         /* Call SCSI completion function to complete the IO */
2014                 sc->result = (DID_ABORT << 16);
2015                 sc->scsi_done(sc);
2016                 atomic64_dec(&fnic_stats->io_stats.active_ios);
2017                 if (atomic64_read(&fnic->io_cmpl_skip))
2018                         atomic64_dec(&fnic->io_cmpl_skip);
2019                 else
2020                         atomic64_inc(&fnic_stats->io_stats.io_completions);
2021         }
2022
2023 fnic_abort_cmd_end:
2024         FNIC_TRACE(fnic_abort_cmd, sc->device->host->host_no,
2025                   sc->request->tag, sc,
2026                   jiffies_to_msecs(jiffies - start_time),
2027                   0, ((u64)sc->cmnd[0] << 32 |
2028                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2029                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2030                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2031
2032         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2033                       "Returning from abort cmd type %x %s\n", task_req,
2034                       (ret == SUCCESS) ?
2035                       "SUCCESS" : "FAILED");
2036         return ret;
2037 }
2038
2039 static inline int fnic_queue_dr_io_req(struct fnic *fnic,
2040                                        struct scsi_cmnd *sc,
2041                                        struct fnic_io_req *io_req)
2042 {
2043         struct vnic_wq_copy *wq = &fnic->wq_copy[0];
2044         struct Scsi_Host *host = fnic->lport->host;
2045         struct misc_stats *misc_stats = &fnic->fnic_stats.misc_stats;
2046         struct scsi_lun fc_lun;
2047         int ret = 0;
2048         unsigned long intr_flags;
2049
2050         spin_lock_irqsave(host->host_lock, intr_flags);
2051         if (unlikely(fnic_chk_state_flags_locked(fnic,
2052                                                 FNIC_FLAGS_IO_BLOCKED))) {
2053                 spin_unlock_irqrestore(host->host_lock, intr_flags);
2054                 return FAILED;
2055         } else
2056                 atomic_inc(&fnic->in_flight);
2057         spin_unlock_irqrestore(host->host_lock, intr_flags);
2058
2059         spin_lock_irqsave(&fnic->wq_copy_lock[0], intr_flags);
2060
2061         if (vnic_wq_copy_desc_avail(wq) <= fnic->wq_copy_desc_low[0])
2062                 free_wq_copy_descs(fnic, wq);
2063
2064         if (!vnic_wq_copy_desc_avail(wq)) {
2065                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2066                           "queue_dr_io_req failure - no descriptors\n");
2067                 atomic64_inc(&misc_stats->devrst_cpwq_alloc_failures);
2068                 ret = -EAGAIN;
2069                 goto lr_io_req_end;
2070         }
2071
2072         /* fill in the lun info */
2073         int_to_scsilun(sc->device->lun, &fc_lun);
2074
2075         fnic_queue_wq_copy_desc_itmf(wq, sc->request->tag | FNIC_TAG_DEV_RST,
2076                                      0, FCPIO_ITMF_LUN_RESET, SCSI_NO_TAG,
2077                                      fc_lun.scsi_lun, io_req->port_id,
2078                                      fnic->config.ra_tov, fnic->config.ed_tov);
2079
2080         atomic64_inc(&fnic->fnic_stats.fw_stats.active_fw_reqs);
2081         if (atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs) >
2082                   atomic64_read(&fnic->fnic_stats.fw_stats.max_fw_reqs))
2083                 atomic64_set(&fnic->fnic_stats.fw_stats.max_fw_reqs,
2084                   atomic64_read(&fnic->fnic_stats.fw_stats.active_fw_reqs));
2085
2086 lr_io_req_end:
2087         spin_unlock_irqrestore(&fnic->wq_copy_lock[0], intr_flags);
2088         atomic_dec(&fnic->in_flight);
2089
2090         return ret;
2091 }
2092
2093 /*
2094  * Clean up any pending aborts on the lun
2095  * For each outstanding IO on this lun, whose abort is not completed by fw,
2096  * issue a local abort. Wait for abort to complete. Return 0 if all commands
2097  * successfully aborted, 1 otherwise
2098  */
2099 static int fnic_clean_pending_aborts(struct fnic *fnic,
2100                                      struct scsi_cmnd *lr_sc,
2101                                          bool new_sc)
2102
2103 {
2104         int tag, abt_tag;
2105         struct fnic_io_req *io_req;
2106         spinlock_t *io_lock;
2107         unsigned long flags;
2108         int ret = 0;
2109         struct scsi_cmnd *sc;
2110         struct scsi_lun fc_lun;
2111         struct scsi_device *lun_dev = lr_sc->device;
2112         DECLARE_COMPLETION_ONSTACK(tm_done);
2113         enum fnic_ioreq_state old_ioreq_state;
2114
2115         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2116                 io_lock = fnic_io_lock_tag(fnic, tag);
2117                 spin_lock_irqsave(io_lock, flags);
2118                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2119                 /*
2120                  * ignore this lun reset cmd if issued using new SC
2121                  * or cmds that do not belong to this lun
2122                  */
2123                 if (!sc || ((sc == lr_sc) && new_sc) || sc->device != lun_dev) {
2124                         spin_unlock_irqrestore(io_lock, flags);
2125                         continue;
2126                 }
2127
2128                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2129
2130                 if (!io_req || sc->device != lun_dev) {
2131                         spin_unlock_irqrestore(io_lock, flags);
2132                         continue;
2133                 }
2134
2135                 /*
2136                  * Found IO that is still pending with firmware and
2137                  * belongs to the LUN that we are resetting
2138                  */
2139                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2140                               "Found IO in %s on lun\n",
2141                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2142
2143                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
2144                         spin_unlock_irqrestore(io_lock, flags);
2145                         continue;
2146                 }
2147                 if ((CMD_FLAGS(sc) & FNIC_DEVICE_RESET) &&
2148                         (!(CMD_FLAGS(sc) & FNIC_DEV_RST_ISSUED))) {
2149                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2150                                 "%s dev rst not pending sc 0x%p\n", __func__,
2151                                 sc);
2152                         spin_unlock_irqrestore(io_lock, flags);
2153                         continue;
2154                 }
2155
2156                 if (io_req->abts_done)
2157                         shost_printk(KERN_ERR, fnic->lport->host,
2158                           "%s: io_req->abts_done is set state is %s\n",
2159                           __func__, fnic_ioreq_state_to_str(CMD_STATE(sc)));
2160                 old_ioreq_state = CMD_STATE(sc);
2161                 /*
2162                  * Any pending IO issued prior to reset is expected to be
2163                  * in abts pending state, if not we need to set
2164                  * FNIC_IOREQ_ABTS_PENDING to indicate the IO is abort pending.
2165                  * When IO is completed, the IO will be handed over and
2166                  * handled in this function.
2167                  */
2168                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2169
2170                 BUG_ON(io_req->abts_done);
2171
2172                 abt_tag = tag;
2173                 if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET) {
2174                         abt_tag |= FNIC_TAG_DEV_RST;
2175                         FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2176                                   "%s: dev rst sc 0x%p\n", __func__, sc);
2177                 }
2178
2179                 CMD_ABTS_STATUS(sc) = FCPIO_INVALID_CODE;
2180                 io_req->abts_done = &tm_done;
2181                 spin_unlock_irqrestore(io_lock, flags);
2182
2183                 /* Now queue the abort command to firmware */
2184                 int_to_scsilun(sc->device->lun, &fc_lun);
2185
2186                 if (fnic_queue_abort_io_req(fnic, abt_tag,
2187                                             FCPIO_ITMF_ABT_TASK_TERM,
2188                                             fc_lun.scsi_lun, io_req)) {
2189                         spin_lock_irqsave(io_lock, flags);
2190                         io_req = (struct fnic_io_req *)CMD_SP(sc);
2191                         if (io_req)
2192                                 io_req->abts_done = NULL;
2193                         if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2194                                 CMD_STATE(sc) = old_ioreq_state;
2195                         spin_unlock_irqrestore(io_lock, flags);
2196                         ret = 1;
2197                         goto clean_pending_aborts_end;
2198                 } else {
2199                         spin_lock_irqsave(io_lock, flags);
2200                         if (CMD_FLAGS(sc) & FNIC_DEVICE_RESET)
2201                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2202                         spin_unlock_irqrestore(io_lock, flags);
2203                 }
2204                 CMD_FLAGS(sc) |= FNIC_IO_INTERNAL_TERM_ISSUED;
2205
2206                 wait_for_completion_timeout(&tm_done,
2207                                             msecs_to_jiffies
2208                                             (fnic->config.ed_tov));
2209
2210                 /* Recheck cmd state to check if it is now aborted */
2211                 spin_lock_irqsave(io_lock, flags);
2212                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2213                 if (!io_req) {
2214                         spin_unlock_irqrestore(io_lock, flags);
2215                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_REQ_NULL;
2216                         continue;
2217                 }
2218
2219                 io_req->abts_done = NULL;
2220
2221                 /* if abort is still pending with fw, fail */
2222                 if (CMD_ABTS_STATUS(sc) == FCPIO_INVALID_CODE) {
2223                         spin_unlock_irqrestore(io_lock, flags);
2224                         CMD_FLAGS(sc) |= FNIC_IO_ABT_TERM_DONE;
2225                         ret = 1;
2226                         goto clean_pending_aborts_end;
2227                 }
2228                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
2229
2230                 /* original sc used for lr is handled by dev reset code */
2231                 if (sc != lr_sc)
2232                         CMD_SP(sc) = NULL;
2233                 spin_unlock_irqrestore(io_lock, flags);
2234
2235                 /* original sc used for lr is handled by dev reset code */
2236                 if (sc != lr_sc) {
2237                         fnic_release_ioreq_buf(fnic, io_req, sc);
2238                         mempool_free(io_req, fnic->io_req_pool);
2239                 }
2240
2241                 /*
2242                  * Any IO is returned during reset, it needs to call scsi_done
2243                  * to return the scsi_cmnd to upper layer.
2244                  */
2245                 if (sc->scsi_done) {
2246                         /* Set result to let upper SCSI layer retry */
2247                         sc->result = DID_RESET << 16;
2248                         sc->scsi_done(sc);
2249                 }
2250         }
2251
2252         schedule_timeout(msecs_to_jiffies(2 * fnic->config.ed_tov));
2253
2254         /* walk again to check, if IOs are still pending in fw */
2255         if (fnic_is_abts_pending(fnic, lr_sc))
2256                 ret = FAILED;
2257
2258 clean_pending_aborts_end:
2259         return ret;
2260 }
2261
2262 /**
2263  * fnic_scsi_host_start_tag
2264  * Allocates tagid from host's tag list
2265  **/
2266 static inline int
2267 fnic_scsi_host_start_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2268 {
2269         struct request_queue *q = sc->request->q;
2270         struct request *dummy;
2271
2272         dummy = blk_mq_alloc_request(q, REQ_OP_WRITE, BLK_MQ_REQ_NOWAIT);
2273         if (IS_ERR(dummy))
2274                 return SCSI_NO_TAG;
2275
2276         sc->tag = sc->request->tag = dummy->tag;
2277         sc->request->special = sc;
2278
2279         return dummy->tag;
2280 }
2281
2282 /**
2283  * fnic_scsi_host_end_tag
2284  * frees tag allocated by fnic_scsi_host_start_tag.
2285  **/
2286 static inline void
2287 fnic_scsi_host_end_tag(struct fnic *fnic, struct scsi_cmnd *sc)
2288 {
2289         struct request *dummy = sc->request->special;
2290
2291         blk_mq_free_request(dummy);
2292 }
2293
2294 /*
2295  * SCSI Eh thread issues a Lun Reset when one or more commands on a LUN
2296  * fail to get aborted. It calls driver's eh_device_reset with a SCSI command
2297  * on the LUN.
2298  */
2299 int fnic_device_reset(struct scsi_cmnd *sc)
2300 {
2301         struct fc_lport *lp;
2302         struct fnic *fnic;
2303         struct fnic_io_req *io_req = NULL;
2304         struct fc_rport *rport;
2305         int status;
2306         int ret = FAILED;
2307         spinlock_t *io_lock;
2308         unsigned long flags;
2309         unsigned long start_time = 0;
2310         struct scsi_lun fc_lun;
2311         struct fnic_stats *fnic_stats;
2312         struct reset_stats *reset_stats;
2313         int tag = 0;
2314         DECLARE_COMPLETION_ONSTACK(tm_done);
2315         int tag_gen_flag = 0;   /*to track tags allocated by fnic driver*/
2316         bool new_sc = 0;
2317
2318         /* Wait for rport to unblock */
2319         fc_block_scsi_eh(sc);
2320
2321         /* Get local-port, check ready and link up */
2322         lp = shost_priv(sc->device->host);
2323
2324         fnic = lport_priv(lp);
2325         fnic_stats = &fnic->fnic_stats;
2326         reset_stats = &fnic->fnic_stats.reset_stats;
2327
2328         atomic64_inc(&reset_stats->device_resets);
2329
2330         rport = starget_to_rport(scsi_target(sc->device));
2331         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2332                       "Device reset called FCID 0x%x, LUN 0x%llx sc 0x%p\n",
2333                       rport->port_id, sc->device->lun, sc);
2334
2335         if (lp->state != LPORT_ST_READY || !(lp->link_up))
2336                 goto fnic_device_reset_end;
2337
2338         /* Check if remote port up */
2339         if (fc_remote_port_chkready(rport)) {
2340                 atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
2341                 goto fnic_device_reset_end;
2342         }
2343
2344         CMD_FLAGS(sc) = FNIC_DEVICE_RESET;
2345         /* Allocate tag if not present */
2346
2347         tag = sc->request->tag;
2348         if (unlikely(tag < 0)) {
2349                 /*
2350                  * Really should fix the midlayer to pass in a proper
2351                  * request for ioctls...
2352                  */
2353                 tag = fnic_scsi_host_start_tag(fnic, sc);
2354                 if (unlikely(tag == SCSI_NO_TAG))
2355                         goto fnic_device_reset_end;
2356                 tag_gen_flag = 1;
2357                 new_sc = 1;
2358         }
2359         io_lock = fnic_io_lock_hash(fnic, sc);
2360         spin_lock_irqsave(io_lock, flags);
2361         io_req = (struct fnic_io_req *)CMD_SP(sc);
2362
2363         /*
2364          * If there is a io_req attached to this command, then use it,
2365          * else allocate a new one.
2366          */
2367         if (!io_req) {
2368                 io_req = mempool_alloc(fnic->io_req_pool, GFP_ATOMIC);
2369                 if (!io_req) {
2370                         spin_unlock_irqrestore(io_lock, flags);
2371                         goto fnic_device_reset_end;
2372                 }
2373                 memset(io_req, 0, sizeof(*io_req));
2374                 io_req->port_id = rport->port_id;
2375                 CMD_SP(sc) = (char *)io_req;
2376         }
2377         io_req->dr_done = &tm_done;
2378         CMD_STATE(sc) = FNIC_IOREQ_CMD_PENDING;
2379         CMD_LR_STATUS(sc) = FCPIO_INVALID_CODE;
2380         spin_unlock_irqrestore(io_lock, flags);
2381
2382         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "TAG %x\n", tag);
2383
2384         /*
2385          * issue the device reset, if enqueue failed, clean up the ioreq
2386          * and break assoc with scsi cmd
2387          */
2388         if (fnic_queue_dr_io_req(fnic, sc, io_req)) {
2389                 spin_lock_irqsave(io_lock, flags);
2390                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2391                 if (io_req)
2392                         io_req->dr_done = NULL;
2393                 goto fnic_device_reset_clean;
2394         }
2395         spin_lock_irqsave(io_lock, flags);
2396         CMD_FLAGS(sc) |= FNIC_DEV_RST_ISSUED;
2397         spin_unlock_irqrestore(io_lock, flags);
2398
2399         /*
2400          * Wait on the local completion for LUN reset.  The io_req may be
2401          * freed while we wait since we hold no lock.
2402          */
2403         wait_for_completion_timeout(&tm_done,
2404                                     msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2405
2406         spin_lock_irqsave(io_lock, flags);
2407         io_req = (struct fnic_io_req *)CMD_SP(sc);
2408         if (!io_req) {
2409                 spin_unlock_irqrestore(io_lock, flags);
2410                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2411                                 "io_req is null tag 0x%x sc 0x%p\n", tag, sc);
2412                 goto fnic_device_reset_end;
2413         }
2414         io_req->dr_done = NULL;
2415
2416         status = CMD_LR_STATUS(sc);
2417
2418         /*
2419          * If lun reset not completed, bail out with failed. io_req
2420          * gets cleaned up during higher levels of EH
2421          */
2422         if (status == FCPIO_INVALID_CODE) {
2423                 atomic64_inc(&reset_stats->device_reset_timeouts);
2424                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2425                               "Device reset timed out\n");
2426                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TIMED_OUT;
2427                 spin_unlock_irqrestore(io_lock, flags);
2428                 int_to_scsilun(sc->device->lun, &fc_lun);
2429                 /*
2430                  * Issue abort and terminate on device reset request.
2431                  * If q'ing of terminate fails, retry it after a delay.
2432                  */
2433                 while (1) {
2434                         spin_lock_irqsave(io_lock, flags);
2435                         if (CMD_FLAGS(sc) & FNIC_DEV_RST_TERM_ISSUED) {
2436                                 spin_unlock_irqrestore(io_lock, flags);
2437                                 break;
2438                         }
2439                         spin_unlock_irqrestore(io_lock, flags);
2440                         if (fnic_queue_abort_io_req(fnic,
2441                                 tag | FNIC_TAG_DEV_RST,
2442                                 FCPIO_ITMF_ABT_TASK_TERM,
2443                                 fc_lun.scsi_lun, io_req)) {
2444                                 wait_for_completion_timeout(&tm_done,
2445                                 msecs_to_jiffies(FNIC_ABT_TERM_DELAY_TIMEOUT));
2446                         } else {
2447                                 spin_lock_irqsave(io_lock, flags);
2448                                 CMD_FLAGS(sc) |= FNIC_DEV_RST_TERM_ISSUED;
2449                                 CMD_STATE(sc) = FNIC_IOREQ_ABTS_PENDING;
2450                                 io_req->abts_done = &tm_done;
2451                                 spin_unlock_irqrestore(io_lock, flags);
2452                                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2453                                 "Abort and terminate issued on Device reset "
2454                                 "tag 0x%x sc 0x%p\n", tag, sc);
2455                                 break;
2456                         }
2457                 }
2458                 while (1) {
2459                         spin_lock_irqsave(io_lock, flags);
2460                         if (!(CMD_FLAGS(sc) & FNIC_DEV_RST_DONE)) {
2461                                 spin_unlock_irqrestore(io_lock, flags);
2462                                 wait_for_completion_timeout(&tm_done,
2463                                 msecs_to_jiffies(FNIC_LUN_RESET_TIMEOUT));
2464                                 break;
2465                         } else {
2466                                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2467                                 io_req->abts_done = NULL;
2468                                 goto fnic_device_reset_clean;
2469                         }
2470                 }
2471         } else {
2472                 spin_unlock_irqrestore(io_lock, flags);
2473         }
2474
2475         /* Completed, but not successful, clean up the io_req, return fail */
2476         if (status != FCPIO_SUCCESS) {
2477                 spin_lock_irqsave(io_lock, flags);
2478                 FNIC_SCSI_DBG(KERN_DEBUG,
2479                               fnic->lport->host,
2480                               "Device reset completed - failed\n");
2481                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2482                 goto fnic_device_reset_clean;
2483         }
2484
2485         /*
2486          * Clean up any aborts on this lun that have still not
2487          * completed. If any of these fail, then LUN reset fails.
2488          * clean_pending_aborts cleans all cmds on this lun except
2489          * the lun reset cmd. If all cmds get cleaned, the lun reset
2490          * succeeds
2491          */
2492         if (fnic_clean_pending_aborts(fnic, sc, new_sc)) {
2493                 spin_lock_irqsave(io_lock, flags);
2494                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2495                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2496                               "Device reset failed"
2497                               " since could not abort all IOs\n");
2498                 goto fnic_device_reset_clean;
2499         }
2500
2501         /* Clean lun reset command */
2502         spin_lock_irqsave(io_lock, flags);
2503         io_req = (struct fnic_io_req *)CMD_SP(sc);
2504         if (io_req)
2505                 /* Completed, and successful */
2506                 ret = SUCCESS;
2507
2508 fnic_device_reset_clean:
2509         if (io_req)
2510                 CMD_SP(sc) = NULL;
2511
2512         spin_unlock_irqrestore(io_lock, flags);
2513
2514         if (io_req) {
2515                 start_time = io_req->start_time;
2516                 fnic_release_ioreq_buf(fnic, io_req, sc);
2517                 mempool_free(io_req, fnic->io_req_pool);
2518         }
2519
2520 fnic_device_reset_end:
2521         FNIC_TRACE(fnic_device_reset, sc->device->host->host_no,
2522                   sc->request->tag, sc,
2523                   jiffies_to_msecs(jiffies - start_time),
2524                   0, ((u64)sc->cmnd[0] << 32 |
2525                   (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
2526                   (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
2527                   (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
2528
2529         /* free tag if it is allocated */
2530         if (unlikely(tag_gen_flag))
2531                 fnic_scsi_host_end_tag(fnic, sc);
2532
2533         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2534                       "Returning from device reset %s\n",
2535                       (ret == SUCCESS) ?
2536                       "SUCCESS" : "FAILED");
2537
2538         if (ret == FAILED)
2539                 atomic64_inc(&reset_stats->device_reset_failures);
2540
2541         return ret;
2542 }
2543
2544 /* Clean up all IOs, clean up libFC local port */
2545 int fnic_reset(struct Scsi_Host *shost)
2546 {
2547         struct fc_lport *lp;
2548         struct fnic *fnic;
2549         int ret = 0;
2550         struct reset_stats *reset_stats;
2551
2552         lp = shost_priv(shost);
2553         fnic = lport_priv(lp);
2554         reset_stats = &fnic->fnic_stats.reset_stats;
2555
2556         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2557                       "fnic_reset called\n");
2558
2559         atomic64_inc(&reset_stats->fnic_resets);
2560
2561         /*
2562          * Reset local port, this will clean up libFC exchanges,
2563          * reset remote port sessions, and if link is up, begin flogi
2564          */
2565         ret = fc_lport_reset(lp);
2566
2567         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2568                       "Returning from fnic reset %s\n",
2569                       (ret == 0) ?
2570                       "SUCCESS" : "FAILED");
2571
2572         if (ret == 0)
2573                 atomic64_inc(&reset_stats->fnic_reset_completions);
2574         else
2575                 atomic64_inc(&reset_stats->fnic_reset_failures);
2576
2577         return ret;
2578 }
2579
2580 /*
2581  * SCSI Error handling calls driver's eh_host_reset if all prior
2582  * error handling levels return FAILED. If host reset completes
2583  * successfully, and if link is up, then Fabric login begins.
2584  *
2585  * Host Reset is the highest level of error recovery. If this fails, then
2586  * host is offlined by SCSI.
2587  *
2588  */
2589 int fnic_host_reset(struct scsi_cmnd *sc)
2590 {
2591         int ret;
2592         unsigned long wait_host_tmo;
2593         struct Scsi_Host *shost = sc->device->host;
2594         struct fc_lport *lp = shost_priv(shost);
2595         struct fnic *fnic = lport_priv(lp);
2596         unsigned long flags;
2597
2598         spin_lock_irqsave(&fnic->fnic_lock, flags);
2599         if (fnic->internal_reset_inprogress == 0) {
2600                 fnic->internal_reset_inprogress = 1;
2601         } else {
2602                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2603                 FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2604                         "host reset in progress skipping another host reset\n");
2605                 return SUCCESS;
2606         }
2607         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2608
2609         /*
2610          * If fnic_reset is successful, wait for fabric login to complete
2611          * scsi-ml tries to send a TUR to every device if host reset is
2612          * successful, so before returning to scsi, fabric should be up
2613          */
2614         ret = (fnic_reset(shost) == 0) ? SUCCESS : FAILED;
2615         if (ret == SUCCESS) {
2616                 wait_host_tmo = jiffies + FNIC_HOST_RESET_SETTLE_TIME * HZ;
2617                 ret = FAILED;
2618                 while (time_before(jiffies, wait_host_tmo)) {
2619                         if ((lp->state == LPORT_ST_READY) &&
2620                             (lp->link_up)) {
2621                                 ret = SUCCESS;
2622                                 break;
2623                         }
2624                         ssleep(1);
2625                 }
2626         }
2627
2628         spin_lock_irqsave(&fnic->fnic_lock, flags);
2629         fnic->internal_reset_inprogress = 0;
2630         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2631         return ret;
2632 }
2633
2634 /*
2635  * This fxn is called from libFC when host is removed
2636  */
2637 void fnic_scsi_abort_io(struct fc_lport *lp)
2638 {
2639         int err = 0;
2640         unsigned long flags;
2641         enum fnic_state old_state;
2642         struct fnic *fnic = lport_priv(lp);
2643         DECLARE_COMPLETION_ONSTACK(remove_wait);
2644
2645         /* Issue firmware reset for fnic, wait for reset to complete */
2646 retry_fw_reset:
2647         spin_lock_irqsave(&fnic->fnic_lock, flags);
2648         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2649                 /* fw reset is in progress, poll for its completion */
2650                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2651                 schedule_timeout(msecs_to_jiffies(100));
2652                 goto retry_fw_reset;
2653         }
2654
2655         fnic->remove_wait = &remove_wait;
2656         old_state = fnic->state;
2657         fnic->state = FNIC_IN_FC_TRANS_ETH_MODE;
2658         fnic_update_mac_locked(fnic, fnic->ctlr.ctl_src_addr);
2659         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2660
2661         err = fnic_fw_reset_handler(fnic);
2662         if (err) {
2663                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2664                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2665                         fnic->state = old_state;
2666                 fnic->remove_wait = NULL;
2667                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2668                 return;
2669         }
2670
2671         /* Wait for firmware reset to complete */
2672         wait_for_completion_timeout(&remove_wait,
2673                                     msecs_to_jiffies(FNIC_RMDEVICE_TIMEOUT));
2674
2675         spin_lock_irqsave(&fnic->fnic_lock, flags);
2676         fnic->remove_wait = NULL;
2677         FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
2678                       "fnic_scsi_abort_io %s\n",
2679                       (fnic->state == FNIC_IN_ETH_MODE) ?
2680                       "SUCCESS" : "FAILED");
2681         spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2682
2683 }
2684
2685 /*
2686  * This fxn called from libFC to clean up driver IO state on link down
2687  */
2688 void fnic_scsi_cleanup(struct fc_lport *lp)
2689 {
2690         unsigned long flags;
2691         enum fnic_state old_state;
2692         struct fnic *fnic = lport_priv(lp);
2693
2694         /* issue fw reset */
2695 retry_fw_reset:
2696         spin_lock_irqsave(&fnic->fnic_lock, flags);
2697         if (unlikely(fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)) {
2698                 /* fw reset is in progress, poll for its completion */
2699                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2700                 schedule_timeout(msecs_to_jiffies(100));
2701                 goto retry_fw_reset;
2702         }
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         if (fnic_fw_reset_handler(fnic)) {
2709                 spin_lock_irqsave(&fnic->fnic_lock, flags);
2710                 if (fnic->state == FNIC_IN_FC_TRANS_ETH_MODE)
2711                         fnic->state = old_state;
2712                 spin_unlock_irqrestore(&fnic->fnic_lock, flags);
2713         }
2714
2715 }
2716
2717 void fnic_empty_scsi_cleanup(struct fc_lport *lp)
2718 {
2719 }
2720
2721 void fnic_exch_mgr_reset(struct fc_lport *lp, u32 sid, u32 did)
2722 {
2723         struct fnic *fnic = lport_priv(lp);
2724
2725         /* Non-zero sid, nothing to do */
2726         if (sid)
2727                 goto call_fc_exch_mgr_reset;
2728
2729         if (did) {
2730                 fnic_rport_exch_reset(fnic, did);
2731                 goto call_fc_exch_mgr_reset;
2732         }
2733
2734         /*
2735          * sid = 0, did = 0
2736          * link down or device being removed
2737          */
2738         if (!fnic->in_remove)
2739                 fnic_scsi_cleanup(lp);
2740         else
2741                 fnic_scsi_abort_io(lp);
2742
2743         /* call libFC exch mgr reset to reset its exchanges */
2744 call_fc_exch_mgr_reset:
2745         fc_exch_mgr_reset(lp, sid, did);
2746
2747 }
2748
2749 /*
2750  * fnic_is_abts_pending() is a helper function that
2751  * walks through tag map to check if there is any IOs pending,if there is one,
2752  * then it returns 1 (true), otherwise 0 (false)
2753  * if @lr_sc is non NULL, then it checks IOs specific to particular LUN,
2754  * otherwise, it checks for all IOs.
2755  */
2756 int fnic_is_abts_pending(struct fnic *fnic, struct scsi_cmnd *lr_sc)
2757 {
2758         int tag;
2759         struct fnic_io_req *io_req;
2760         spinlock_t *io_lock;
2761         unsigned long flags;
2762         int ret = 0;
2763         struct scsi_cmnd *sc;
2764         struct scsi_device *lun_dev = NULL;
2765
2766         if (lr_sc)
2767                 lun_dev = lr_sc->device;
2768
2769         /* walk again to check, if IOs are still pending in fw */
2770         for (tag = 0; tag < fnic->fnic_max_tag_id; tag++) {
2771                 sc = scsi_host_find_tag(fnic->lport->host, tag);
2772                 /*
2773                  * ignore this lun reset cmd or cmds that do not belong to
2774                  * this lun
2775                  */
2776                 if (!sc || (lr_sc && (sc->device != lun_dev || sc == lr_sc)))
2777                         continue;
2778
2779                 io_lock = fnic_io_lock_hash(fnic, sc);
2780                 spin_lock_irqsave(io_lock, flags);
2781
2782                 io_req = (struct fnic_io_req *)CMD_SP(sc);
2783
2784                 if (!io_req || sc->device != lun_dev) {
2785                         spin_unlock_irqrestore(io_lock, flags);
2786                         continue;
2787                 }
2788
2789                 /*
2790                  * Found IO that is still pending with firmware and
2791                  * belongs to the LUN that we are resetting
2792                  */
2793                 FNIC_SCSI_DBG(KERN_INFO, fnic->lport->host,
2794                               "Found IO in %s on lun\n",
2795                               fnic_ioreq_state_to_str(CMD_STATE(sc)));
2796
2797                 if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING)
2798                         ret = 1;
2799                 spin_unlock_irqrestore(io_lock, flags);
2800         }
2801
2802         return ret;
2803 }