Pileus Git - ~andy/linux/blob - drivers/scsi/fnic/fnic_scsi.c

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