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