drivers/scsi/lpfc/lpfc_scsi.c

   1 /*******************************************************************
   2  * This file is part of the Emulex Linux Device Driver for         *
   3  * Fibre Channel Host Bus Adapters.                                *
   4  * Copyright (C) 2004-2007 Emulex.  All rights reserved.           *
   5  * EMULEX and SLI are trademarks of Emulex.                        *
   6  * www.emulex.com                                                  *
   7  * Portions Copyright (C) 2004-2005 Christoph Hellwig              *
   8  *                                                                 *
   9  * This program is free software; you can redistribute it and/or   *
  10  * modify it under the terms of version 2 of the GNU General       *
  11  * Public License as published by the Free Software Foundation.    *
  12  * This program is distributed in the hope that it will be useful. *
  13  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND          *
  14  * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,  *
  15  * FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE      *
  16  * DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD *
  17  * TO BE LEGALLY INVALID.  See the GNU General Public License for  *
  18  * more details, a copy of which can be found in the file COPYING  *
  19  * included with this package.                                     *
  20  *******************************************************************/
  21
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/delay.h>
  25
  26 #include <scsi/scsi.h>
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/scsi_host.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <scsi/scsi_transport_fc.h>
  31
  32 #include "lpfc_version.h"
  33 #include "lpfc_hw.h"
  34 #include "lpfc_sli.h"
  35 #include "lpfc_disc.h"
  36 #include "lpfc_scsi.h"
  37 #include "lpfc.h"
  38 #include "lpfc_logmsg.h"
  39 #include "lpfc_crtn.h"
  40 #include "lpfc_vport.h"
  41
  42 #define LPFC_RESET_WAIT  2
  43 #define LPFC_ABORT_WAIT  2
  44
  45 /*
  46  * This function is called with no lock held when there is a resource
  47  * error in driver or in firmware.
  48  */
  49 void
  50 lpfc_adjust_queue_depth(struct lpfc_hba *phba)
  51 {
  52         unsigned long flags;
  53
  54         spin_lock_irqsave(&phba->hbalock, flags);
  55         atomic_inc(&phba->num_rsrc_err);
  56         phba->last_rsrc_error_time = jiffies;
  57
  58         if ((phba->last_ramp_down_time + QUEUE_RAMP_DOWN_INTERVAL) > jiffies) {
  59                 spin_unlock_irqrestore(&phba->hbalock, flags);
  60                 return;
  61         }
  62
  63         phba->last_ramp_down_time = jiffies;
  64
  65         spin_unlock_irqrestore(&phba->hbalock, flags);
  66
  67         spin_lock_irqsave(&phba->pport->work_port_lock, flags);
  68         if ((phba->pport->work_port_events &
  69                 WORKER_RAMP_DOWN_QUEUE) == 0) {
  70                 phba->pport->work_port_events |= WORKER_RAMP_DOWN_QUEUE;
  71         }
  72         spin_unlock_irqrestore(&phba->pport->work_port_lock, flags);
  73
  74         spin_lock_irqsave(&phba->hbalock, flags);
  75         if (phba->work_wait)
  76                 wake_up(phba->work_wait);
  77         spin_unlock_irqrestore(&phba->hbalock, flags);
  78
  79         return;
  80 }
  81
  82 /*
  83  * This function is called with no lock held when there is a successful
  84  * SCSI command completion.
  85  */
  86 static inline void
  87 lpfc_rampup_queue_depth(struct lpfc_hba *phba,
  88                         struct scsi_device *sdev)
  89 {
  90         unsigned long flags;
  91         atomic_inc(&phba->num_cmd_success);
  92
  93         if (phba->cfg_lun_queue_depth <= sdev->queue_depth)
  94                 return;
  95
  96         spin_lock_irqsave(&phba->hbalock, flags);
  97         if (((phba->last_ramp_up_time + QUEUE_RAMP_UP_INTERVAL) > jiffies) ||
  98          ((phba->last_rsrc_error_time + QUEUE_RAMP_UP_INTERVAL ) > jiffies)) {
  99                 spin_unlock_irqrestore(&phba->hbalock, flags);
 100                 return;
 101         }
 102
 103         phba->last_ramp_up_time = jiffies;
 104         spin_unlock_irqrestore(&phba->hbalock, flags);
 105
 106         spin_lock_irqsave(&phba->pport->work_port_lock, flags);
 107         if ((phba->pport->work_port_events &
 108                 WORKER_RAMP_UP_QUEUE) == 0) {
 109                 phba->pport->work_port_events |= WORKER_RAMP_UP_QUEUE;
 110         }
 111         spin_unlock_irqrestore(&phba->pport->work_port_lock, flags);
 112
 113         spin_lock_irqsave(&phba->hbalock, flags);
 114         if (phba->work_wait)
 115                 wake_up(phba->work_wait);
 116         spin_unlock_irqrestore(&phba->hbalock, flags);
 117 }
 118
 119 void
 120 lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
 121 {
 122         struct lpfc_vport *vport;
 123         struct Scsi_Host  *host;
 124         struct scsi_device *sdev;
 125         unsigned long new_queue_depth;
 126         unsigned long num_rsrc_err, num_cmd_success;
 127
 128         num_rsrc_err = atomic_read(&phba->num_rsrc_err);
 129         num_cmd_success = atomic_read(&phba->num_cmd_success);
 130
 131         spin_lock_irq(&phba->hbalock);
 132         list_for_each_entry(vport, &phba->port_list, listentry) {
 133                 host = lpfc_shost_from_vport(vport);
 134                 if (!scsi_host_get(host))
 135                         continue;
 136
 137                 spin_unlock_irq(&phba->hbalock);
 138
 139                 shost_for_each_device(sdev, host) {
 140                         new_queue_depth = sdev->queue_depth * num_rsrc_err /
 141                         (num_rsrc_err + num_cmd_success);
 142                         if (!new_queue_depth)
 143                                 new_queue_depth = sdev->queue_depth - 1;
 144                         else
 145                                 new_queue_depth =
 146                                         sdev->queue_depth - new_queue_depth;
 147
 148                         if (sdev->ordered_tags)
 149                                 scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG,
 150                                         new_queue_depth);
 151                         else
 152                                 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG,
 153                                         new_queue_depth);
 154                 }
 155                 spin_lock_irq(&phba->hbalock);
 156                 scsi_host_put(host);
 157         }
 158         spin_unlock_irq(&phba->hbalock);
 159         atomic_set(&phba->num_rsrc_err, 0);
 160         atomic_set(&phba->num_cmd_success, 0);
 161 }
 162
 163 void
 164 lpfc_ramp_up_queue_handler(struct lpfc_hba *phba)
 165 {
 166         struct lpfc_vport *vport;
 167         struct Scsi_Host  *host;
 168         struct scsi_device *sdev;
 169
 170         spin_lock_irq(&phba->hbalock);
 171         list_for_each_entry(vport, &phba->port_list, listentry) {
 172                 host = lpfc_shost_from_vport(vport);
 173                 if (!scsi_host_get(host))
 174                         continue;
 175
 176                 spin_unlock_irq(&phba->hbalock);
 177                 shost_for_each_device(sdev, host) {
 178                         if (sdev->ordered_tags)
 179                                 scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG,
 180                                         sdev->queue_depth+1);
 181                         else
 182                                 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG,
 183                                         sdev->queue_depth+1);
 184                 }
 185                 spin_lock_irq(&phba->hbalock);
 186                 scsi_host_put(host);
 187         }
 188         spin_unlock_irq(&phba->hbalock);
 189         atomic_set(&phba->num_rsrc_err, 0);
 190         atomic_set(&phba->num_cmd_success, 0);
 191 }
 192
 193 /*
 194  * This routine allocates a scsi buffer, which contains all the necessary
 195  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
 196  * contains information to build the IOCB.  The DMAable region contains
 197  * memory for the FCP CMND, FCP RSP, and the inital BPL.  In addition to
 198  * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
 199  * and the BPL BDE is setup in the IOCB.
 200  */
 201 static struct lpfc_scsi_buf *
 202 lpfc_new_scsi_buf(struct lpfc_vport *vport)
 203 {
 204         struct lpfc_hba *phba = vport->phba;
 205         struct lpfc_scsi_buf *psb;
 206         struct ulp_bde64 *bpl;
 207         IOCB_t *iocb;
 208         dma_addr_t pdma_phys;
 209         uint16_t iotag;
 210
 211         psb = kmalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
 212         if (!psb)
 213                 return NULL;
 214         memset(psb, 0, sizeof (struct lpfc_scsi_buf));
 215
 216         /*
 217          * Get memory from the pci pool to map the virt space to pci bus space
 218          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
 219          * struct fcp_rsp and the number of bde's necessary to support the
 220          * sg_tablesize.
 221          */
 222         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
 223                                                         &psb->dma_handle);
 224         if (!psb->data) {
 225                 kfree(psb);
 226                 return NULL;
 227         }
 228
 229         /* Initialize virtual ptrs to dma_buf region. */
 230         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
 231
 232         /* Allocate iotag for psb->cur_iocbq. */
 233         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
 234         if (iotag == 0) {
 235                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
 236                               psb->data, psb->dma_handle);
 237                 kfree (psb);
 238                 return NULL;
 239         }
 240         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
 241
 242         psb->fcp_cmnd = psb->data;
 243         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
 244         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
 245                                                         sizeof(struct fcp_rsp);
 246
 247         /* Initialize local short-hand pointers. */
 248         bpl = psb->fcp_bpl;
 249         pdma_phys = psb->dma_handle;
 250
 251         /*
 252          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 253          * list bdes.  Initialize the first two and leave the rest for
 254          * queuecommand.
 255          */
 256         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 257         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 258         bpl->tus.f.bdeSize = sizeof (struct fcp_cmnd);
 259         bpl->tus.f.bdeFlags = BUFF_USE_CMND;
 260         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 261         bpl++;
 262
 263         /* Setup the physical region for the FCP RSP */
 264         pdma_phys += sizeof (struct fcp_cmnd);
 265         bpl->addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys));
 266         bpl->addrLow = le32_to_cpu(putPaddrLow(pdma_phys));
 267         bpl->tus.f.bdeSize = sizeof (struct fcp_rsp);
 268         bpl->tus.f.bdeFlags = (BUFF_USE_CMND | BUFF_USE_RCV);
 269         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 270
 271         /*
 272          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 273          * initialize it with all known data now.
 274          */
 275         pdma_phys += (sizeof (struct fcp_rsp));
 276         iocb = &psb->cur_iocbq.iocb;
 277         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 278         iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys);
 279         iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys);
 280         iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 281         iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDL;
 282         iocb->ulpBdeCount = 1;
 283         iocb->ulpClass = CLASS3;
 284
 285         return psb;
 286 }
 287
 288 static struct lpfc_scsi_buf*
 289 lpfc_get_scsi_buf(struct lpfc_hba * phba)
 290 {
 291         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 292         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 293         unsigned long iflag = 0;
 294
 295         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 296         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 297         if (lpfc_cmd) {
 298                 lpfc_cmd->seg_cnt = 0;
 299                 lpfc_cmd->nonsg_phys = 0;
 300         }
 301         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 302         return  lpfc_cmd;
 303 }
 304
 305 static void
 306 lpfc_release_scsi_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *psb)
 307 {
 308         unsigned long iflag = 0;
 309
 310         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 311         psb->pCmd = NULL;
 312         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 313         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 314 }
 315
 316 static int
 317 lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
 318 {
 319         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 320         struct scatterlist *sgel = NULL;
 321         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 322         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 323         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 324         dma_addr_t physaddr;
 325         uint32_t i, num_bde = 0;
 326         int nseg, datadir = scsi_cmnd->sc_data_direction;
 327
 328         /*
 329          * There are three possibilities here - use scatter-gather segment, use
 330          * the single mapping, or neither.  Start the lpfc command prep by
 331          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 332          * data bde entry.
 333          */
 334         bpl += 2;
 335         if (scsi_sg_count(scsi_cmnd)) {
 336                 /*
 337                  * The driver stores the segment count returned from pci_map_sg
 338                  * because this a count of dma-mappings used to map the use_sg
 339                  * pages.  They are not guaranteed to be the same for those
 340                  * architectures that implement an IOMMU.
 341                  */
 342
 343                 nseg = dma_map_sg(&phba->pcidev->dev, scsi_sglist(scsi_cmnd),
 344                                   scsi_sg_count(scsi_cmnd), datadir);
 345                 if (unlikely(!nseg))
 346                         return 1;
 347
 348                 lpfc_cmd->seg_cnt = nseg;
 349                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 350                         printk(KERN_ERR "%s: Too many sg segments from "
 351                                "dma_map_sg.  Config %d, seg_cnt %d",
 352                                __FUNCTION__, phba->cfg_sg_seg_cnt,
 353                                lpfc_cmd->seg_cnt);
 354                         scsi_dma_unmap(scsi_cmnd);
 355                         return 1;
 356                 }
 357
 358                 /*
 359                  * The driver established a maximum scatter-gather segment count
 360                  * during probe that limits the number of sg elements in any
 361                  * single scsi command.  Just run through the seg_cnt and format
 362                  * the bde's.
 363                  */
 364                 scsi_for_each_sg(scsi_cmnd, sgel, nseg, i) {
 365                         physaddr = sg_dma_address(sgel);
 366                         bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
 367                         bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
 368                         bpl->tus.f.bdeSize = sg_dma_len(sgel);
 369                         if (datadir == DMA_TO_DEVICE)
 370                                 bpl->tus.f.bdeFlags = 0;
 371                         else
 372                                 bpl->tus.f.bdeFlags = BUFF_USE_RCV;
 373                         bpl->tus.w = le32_to_cpu(bpl->tus.w);
 374                         bpl++;
 375                         num_bde++;
 376                 }
 377         }
 378
 379         /*
 380          * Finish initializing those IOCB fields that are dependent on the
 381          * scsi_cmnd request_buffer.  Note that the bdeSize is explicitly
 382          * reinitialized since all iocb memory resources are used many times
 383          * for transmit, receive, and continuation bpl's.
 384          */
 385         iocb_cmd->un.fcpi64.bdl.bdeSize = (2 * sizeof (struct ulp_bde64));
 386         iocb_cmd->un.fcpi64.bdl.bdeSize +=
 387                 (num_bde * sizeof (struct ulp_bde64));
 388         iocb_cmd->ulpBdeCount = 1;
 389         iocb_cmd->ulpLe = 1;
 390         fcp_cmnd->fcpDl = be32_to_cpu(scsi_bufflen(scsi_cmnd));
 391         return 0;
 392 }
 393
 394 static void
 395 lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 396 {
 397         /*
 398          * There are only two special cases to consider.  (1) the scsi command
 399          * requested scatter-gather usage or (2) the scsi command allocated
 400          * a request buffer, but did not request use_sg.  There is a third
 401          * case, but it does not require resource deallocation.
 402          */
 403         if (psb->seg_cnt > 0)
 404                 scsi_dma_unmap(psb->pCmd);
 405 }
 406
 407 static void
 408 lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
 409                     struct lpfc_iocbq *rsp_iocb)
 410 {
 411         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 412         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 413         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 414         struct lpfc_hba *phba = vport->phba;
 415         uint32_t fcpi_parm = rsp_iocb->iocb.un.fcpi.fcpi_parm;
 416         uint32_t vpi = vport->vpi;
 417         uint32_t resp_info = fcprsp->rspStatus2;
 418         uint32_t scsi_status = fcprsp->rspStatus3;
 419         uint32_t *lp;
 420         uint32_t host_status = DID_OK;
 421         uint32_t rsplen = 0;
 422         uint32_t logit = LOG_FCP | LOG_FCP_ERROR;
 423
 424         /*
 425          *  If this is a task management command, there is no
 426          *  scsi packet associated with this lpfc_cmd.  The driver
 427          *  consumes it.
 428          */
 429         if (fcpcmd->fcpCntl2) {
 430                 scsi_status = 0;
 431                 goto out;
 432         }
 433
 434         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 435                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 436                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 437                         snslen = SCSI_SENSE_BUFFERSIZE;
 438
 439                 if (resp_info & RSP_LEN_VALID)
 440                   rsplen = be32_to_cpu(fcprsp->rspRspLen);
 441                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 442         }
 443         lp = (uint32_t *)cmnd->sense_buffer;
 444
 445         if (!scsi_status && (resp_info & RESID_UNDER))
 446                 logit = LOG_FCP;
 447
 448         lpfc_printf_log(phba, KERN_WARNING, logit,
 449                         "%d (%d):0730 FCP command x%x failed: x%x SNS x%x x%x "
 450                         "Data: x%x x%x x%x x%x x%x\n",
 451                         phba->brd_no, vpi, cmnd->cmnd[0], scsi_status,
 452                         be32_to_cpu(*lp), be32_to_cpu(*(lp + 3)), resp_info,
 453                         be32_to_cpu(fcprsp->rspResId),
 454                         be32_to_cpu(fcprsp->rspSnsLen),
 455                         be32_to_cpu(fcprsp->rspRspLen),
 456                         fcprsp->rspInfo3);
 457
 458         if (resp_info & RSP_LEN_VALID) {
 459                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 460                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 461                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 462                         host_status = DID_ERROR;
 463                         goto out;
 464                 }
 465         }
 466
 467         scsi_set_resid(cmnd, 0);
 468         if (resp_info & RESID_UNDER) {
 469                 scsi_set_resid(cmnd, be32_to_cpu(fcprsp->rspResId));
 470
 471                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 472                                 "%d (%d):0716 FCP Read Underrun, expected %d, "
 473                                 "residual %d Data: x%x x%x x%x\n",
 474                                 phba->brd_no, vpi, be32_to_cpu(fcpcmd->fcpDl),
 475                                 scsi_get_resid(cmnd), fcpi_parm, cmnd->cmnd[0],
 476                                 cmnd->underflow);
 477
 478                 /*
 479                  * If there is an under run check if under run reported by
 480                  * storage array is same as the under run reported by HBA.
 481                  * If this is not same, there is a dropped frame.
 482                  */
 483                 if ((cmnd->sc_data_direction == DMA_FROM_DEVICE) &&
 484                         fcpi_parm &&
 485                         (scsi_get_resid(cmnd) != fcpi_parm)) {
 486                         lpfc_printf_log(phba, KERN_WARNING,
 487                                         LOG_FCP | LOG_FCP_ERROR,
 488                                         "%d (%d):0735 FCP Read Check Error "
 489                                         "and Underrun Data: x%x x%x x%x x%x\n",
 490                                         phba->brd_no, vpi,
 491                                         be32_to_cpu(fcpcmd->fcpDl),
 492                                         scsi_get_resid(cmnd), fcpi_parm,
 493                                         cmnd->cmnd[0]);
 494                         scsi_set_resid(cmnd, scsi_bufflen(cmnd));
 495                         host_status = DID_ERROR;
 496                 }
 497                 /*
 498                  * The cmnd->underflow is the minimum number of bytes that must
 499                  * be transfered for this command.  Provided a sense condition
 500                  * is not present, make sure the actual amount transferred is at
 501                  * least the underflow value or fail.
 502                  */
 503                 if (!(resp_info & SNS_LEN_VALID) &&
 504                     (scsi_status == SAM_STAT_GOOD) &&
 505                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd)
 506                      < cmnd->underflow)) {
 507                         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 508                                         "%d (%d):0717 FCP command x%x residual "
 509                                         "underrun converted to error "
 510                                         "Data: x%x x%x x%x\n",
 511                                         phba->brd_no, vpi, cmnd->cmnd[0],
 512                                         scsi_bufflen(cmnd),
 513                                         scsi_get_resid(cmnd), cmnd->underflow);
 514                         host_status = DID_ERROR;
 515                 }
 516         } else if (resp_info & RESID_OVER) {
 517                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 518                                 "%d (%d):0720 FCP command x%x residual "
 519                                 "overrun error. Data: x%x x%x \n",
 520                                 phba->brd_no, vpi, cmnd->cmnd[0],
 521                                 scsi_bufflen(cmnd), scsi_get_resid(cmnd));
 522                 host_status = DID_ERROR;
 523
 524         /*
 525          * Check SLI validation that all the transfer was actually done
 526          * (fcpi_parm should be zero). Apply check only to reads.
 527          */
 528         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 529                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 530                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP | LOG_FCP_ERROR,
 531                                 "%d (%d):0734 FCP Read Check Error Data: "
 532                                 "x%x x%x x%x x%x\n",
 533                                 phba->brd_no, vpi,
 534                                 be32_to_cpu(fcpcmd->fcpDl),
 535                                 be32_to_cpu(fcprsp->rspResId),
 536                                 fcpi_parm, cmnd->cmnd[0]);
 537                 host_status = DID_ERROR;
 538                 scsi_set_resid(cmnd, scsi_bufflen(cmnd));
 539         }
 540
 541  out:
 542         cmnd->result = ScsiResult(host_status, scsi_status);
 543 }
 544
 545 static void
 546 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 547                         struct lpfc_iocbq *pIocbOut)
 548 {
 549         struct lpfc_scsi_buf *lpfc_cmd =
 550                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 551         struct lpfc_vport      *vport = pIocbIn->vport;
 552         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 553         struct lpfc_nodelist *pnode = rdata->pnode;
 554         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 555         uint32_t vpi = (lpfc_cmd->cur_iocbq.vport
 556                         ? lpfc_cmd->cur_iocbq.vport->vpi
 557                         : 0);
 558         int result;
 559         struct scsi_device *sdev, *tmp_sdev;
 560         int depth = 0;
 561
 562         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 563         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 564
 565         if (lpfc_cmd->status) {
 566                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 567                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 568                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 569                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 570                         lpfc_cmd->status = IOSTAT_DEFAULT;
 571
 572                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 573                                 "%d (%d):0729 FCP cmd x%x failed <%d/%d> "
 574                                 "status: x%x result: x%x Data: x%x x%x\n",
 575                                 phba->brd_no, vpi, cmd->cmnd[0],
 576                                 cmd->device ? cmd->device->id : 0xffff,
 577                                 cmd->device ? cmd->device->lun : 0xffff,
 578                                 lpfc_cmd->status, lpfc_cmd->result,
 579                                 pIocbOut->iocb.ulpContext,
 580                                 lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 581
 582                 switch (lpfc_cmd->status) {
 583                 case IOSTAT_FCP_RSP_ERROR:
 584                         /* Call FCP RSP handler to determine result */
 585                         lpfc_handle_fcp_err(vport, lpfc_cmd, pIocbOut);
 586                         break;
 587                 case IOSTAT_NPORT_BSY:
 588                 case IOSTAT_FABRIC_BSY:
 589                         cmd->result = ScsiResult(DID_BUS_BUSY, 0);
 590                         break;
 591                 case IOSTAT_LOCAL_REJECT:
 592                         if (lpfc_cmd->result == RJT_UNAVAIL_PERM ||
 593                             lpfc_cmd->result == IOERR_NO_RESOURCES ||
 594                             lpfc_cmd->result == RJT_LOGIN_REQUIRED) {
 595                                 cmd->result = ScsiResult(DID_REQUEUE, 0);
 596                         break;
 597                 } /* else: fall through */
 598                 default:
 599                         cmd->result = ScsiResult(DID_ERROR, 0);
 600                         break;
 601                 }
 602
 603                 if ((pnode == NULL )
 604                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
 605                         cmd->result = ScsiResult(DID_BUS_BUSY, SAM_STAT_BUSY);
 606         } else {
 607                 cmd->result = ScsiResult(DID_OK, 0);
 608         }
 609
 610         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
 611                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
 612
 613                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 614                                 "%d (%d):0710 Iodone <%d/%d> cmd %p, error "
 615                                 "x%x SNS x%x x%x Data: x%x x%x\n",
 616                                 phba->brd_no, vpi, cmd->device->id,
 617                                 cmd->device->lun, cmd, cmd->result,
 618                                 *lp, *(lp + 3), cmd->retries,
 619                                 scsi_get_resid(cmd));
 620         }
 621
 622         result = cmd->result;
 623         sdev = cmd->device;
 624         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
 625         cmd->scsi_done(cmd);
 626
 627         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 628                 lpfc_release_scsi_buf(phba, lpfc_cmd);
 629                 return;
 630         }
 631
 632
 633         if (!result)
 634                 lpfc_rampup_queue_depth(phba, sdev);
 635
 636         if (!result && pnode != NULL &&
 637            ((jiffies - pnode->last_ramp_up_time) >
 638                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 639            ((jiffies - pnode->last_q_full_time) >
 640                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
 641            (phba->cfg_lun_queue_depth > sdev->queue_depth)) {
 642                 shost_for_each_device(tmp_sdev, sdev->host) {
 643                         if (phba->cfg_lun_queue_depth > tmp_sdev->queue_depth) {
 644                                 if (tmp_sdev->id != sdev->id)
 645                                         continue;
 646                                 if (tmp_sdev->ordered_tags)
 647                                         scsi_adjust_queue_depth(tmp_sdev,
 648                                                 MSG_ORDERED_TAG,
 649                                                 tmp_sdev->queue_depth+1);
 650                                 else
 651                                         scsi_adjust_queue_depth(tmp_sdev,
 652                                                 MSG_SIMPLE_TAG,
 653                                                 tmp_sdev->queue_depth+1);
 654
 655                                 pnode->last_ramp_up_time = jiffies;
 656                         }
 657                 }
 658         }
 659
 660         /*
 661          * Check for queue full.  If the lun is reporting queue full, then
 662          * back off the lun queue depth to prevent target overloads.
 663          */
 664         if (result == SAM_STAT_TASK_SET_FULL && pnode != NULL) {
 665                 pnode->last_q_full_time = jiffies;
 666
 667                 shost_for_each_device(tmp_sdev, sdev->host) {
 668                         if (tmp_sdev->id != sdev->id)
 669                                 continue;
 670                         depth = scsi_track_queue_full(tmp_sdev,
 671                                         tmp_sdev->queue_depth - 1);
 672                 }
 673                 /*
 674                  * The queue depth cannot be lowered any more.
 675                  * Modify the returned error code to store
 676                  * the final depth value set by
 677                  * scsi_track_queue_full.
 678                  */
 679                 if (depth == -1)
 680                         depth = sdev->host->cmd_per_lun;
 681
 682                 if (depth) {
 683                         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
 684                                         "%d (%d):0711 detected queue full - "
 685                                         "lun queue depth  adjusted to %d.\n",
 686                                         phba->brd_no, vpi, depth);
 687                 }
 688         }
 689
 690         lpfc_release_scsi_buf(phba, lpfc_cmd);
 691 }
 692
 693 static void
 694 lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
 695                     struct lpfc_nodelist *pnode)
 696 {
 697         struct lpfc_hba *phba = vport->phba;
 698         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 699         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 700         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 701         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
 702         int datadir = scsi_cmnd->sc_data_direction;
 703
 704         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
 705         /* clear task management bits */
 706         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
 707
 708         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
 709                         &lpfc_cmd->fcp_cmnd->fcp_lun);
 710
 711         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
 712
 713         if (scsi_cmnd->device->tagged_supported) {
 714                 switch (scsi_cmnd->tag) {
 715                 case HEAD_OF_QUEUE_TAG:
 716                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
 717                         break;
 718                 case ORDERED_QUEUE_TAG:
 719                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
 720                         break;
 721                 default:
 722                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
 723                         break;
 724                 }
 725         } else
 726                 fcp_cmnd->fcpCntl1 = 0;
 727
 728         /*
 729          * There are three possibilities here - use scatter-gather segment, use
 730          * the single mapping, or neither.  Start the lpfc command prep by
 731          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 732          * data bde entry.
 733          */
 734         if (scsi_sg_count(scsi_cmnd)) {
 735                 if (datadir == DMA_TO_DEVICE) {
 736                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
 737                         iocb_cmd->un.fcpi.fcpi_parm = 0;
 738                         iocb_cmd->ulpPU = 0;
 739                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
 740                         phba->fc4OutputRequests++;
 741                 } else {
 742                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
 743                         iocb_cmd->ulpPU = PARM_READ_CHECK;
 744                         iocb_cmd->un.fcpi.fcpi_parm = scsi_bufflen(scsi_cmnd);
 745                         fcp_cmnd->fcpCntl3 = READ_DATA;
 746                         phba->fc4InputRequests++;
 747                 }
 748         } else {
 749                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
 750                 iocb_cmd->un.fcpi.fcpi_parm = 0;
 751                 iocb_cmd->ulpPU = 0;
 752                 fcp_cmnd->fcpCntl3 = 0;
 753                 phba->fc4ControlRequests++;
 754         }
 755
 756         /*
 757          * Finish initializing those IOCB fields that are independent
 758          * of the scsi_cmnd request_buffer
 759          */
 760         piocbq->iocb.ulpContext = pnode->nlp_rpi;
 761         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
 762                 piocbq->iocb.ulpFCP2Rcvy = 1;
 763
 764         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
 765         piocbq->context1  = lpfc_cmd;
 766         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
 767         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
 768         piocbq->vport = vport;
 769 }
 770
 771 static int
 772 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_vport *vport,
 773                              struct lpfc_scsi_buf *lpfc_cmd,
 774                              unsigned int lun,
 775                              uint8_t task_mgmt_cmd)
 776 {
 777         struct lpfc_iocbq *piocbq;
 778         IOCB_t *piocb;
 779         struct fcp_cmnd *fcp_cmnd;
 780         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 781         struct lpfc_nodelist *ndlp = rdata->pnode;
 782
 783         if ((ndlp == NULL) || (ndlp->nlp_state != NLP_STE_MAPPED_NODE)) {
 784                 return 0;
 785         }
 786
 787         piocbq = &(lpfc_cmd->cur_iocbq);
 788         piocbq->vport = vport;
 789
 790         piocb = &piocbq->iocb;
 791
 792         fcp_cmnd = lpfc_cmd->fcp_cmnd;
 793         int_to_scsilun(lun, &lpfc_cmd->fcp_cmnd->fcp_lun);
 794         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
 795
 796         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
 797
 798         piocb->ulpContext = ndlp->nlp_rpi;
 799         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
 800                 piocb->ulpFCP2Rcvy = 1;
 801         }
 802         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
 803
 804         /* ulpTimeout is only one byte */
 805         if (lpfc_cmd->timeout > 0xff) {
 806                 /*
 807                  * Do not timeout the command at the firmware level.
 808                  * The driver will provide the timeout mechanism.
 809                  */
 810                 piocb->ulpTimeout = 0;
 811         } else {
 812                 piocb->ulpTimeout = lpfc_cmd->timeout;
 813         }
 814
 815         return 1;
 816 }
 817
 818 static void
 819 lpfc_tskmgmt_def_cmpl(struct lpfc_hba *phba,
 820                         struct lpfc_iocbq *cmdiocbq,
 821                         struct lpfc_iocbq *rspiocbq)
 822 {
 823         struct lpfc_scsi_buf *lpfc_cmd =
 824                 (struct lpfc_scsi_buf *) cmdiocbq->context1;
 825         if (lpfc_cmd)
 826                 lpfc_release_scsi_buf(phba, lpfc_cmd);
 827         return;
 828 }
 829
 830 static int
 831 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf *lpfc_cmd, struct lpfc_vport *vport,
 832                     unsigned  tgt_id, unsigned int lun,
 833                     struct lpfc_rport_data *rdata)
 834 {
 835         struct lpfc_hba   *phba = vport->phba;
 836         struct lpfc_iocbq *iocbq;
 837         struct lpfc_iocbq *iocbqrsp;
 838         int ret;
 839
 840         if (!rdata->pnode)
 841                 return FAILED;
 842
 843         lpfc_cmd->rdata = rdata;
 844         ret = lpfc_scsi_prep_task_mgmt_cmd(vport, lpfc_cmd, lun,
 845                                            FCP_TARGET_RESET);
 846         if (!ret)
 847                 return FAILED;
 848
 849         iocbq = &lpfc_cmd->cur_iocbq;
 850         iocbqrsp = lpfc_sli_get_iocbq(phba);
 851
 852         if (!iocbqrsp)
 853                 return FAILED;
 854
 855         /* Issue Target Reset to TGT <num> */
 856         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 857                         "%d (%d):0702 Issue Target Reset to TGT %d "
 858                         "Data: x%x x%x\n",
 859                         phba->brd_no, vport->vpi, tgt_id,
 860                         rdata->pnode->nlp_rpi, rdata->pnode->nlp_flag);
 861
 862         ret = lpfc_sli_issue_iocb_wait(phba,
 863                                        &phba->sli.ring[phba->sli.fcp_ring],
 864                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
 865         if (ret != IOCB_SUCCESS) {
 866                 if (ret == IOCB_TIMEDOUT)
 867                         iocbq->iocb_cmpl = lpfc_tskmgmt_def_cmpl;
 868                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 869         } else {
 870                 ret = SUCCESS;
 871                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
 872                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
 873                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 874                         (lpfc_cmd->result & IOERR_DRVR_MASK))
 875                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 876         }
 877
 878         lpfc_sli_release_iocbq(phba, iocbqrsp);
 879         return ret;
 880 }
 881
 882 const char *
 883 lpfc_info(struct Scsi_Host *host)
 884 {
 885         struct lpfc_vport *vport = (struct lpfc_vport *) host->hostdata;
 886         struct lpfc_hba   *phba = vport->phba;
 887         int len;
 888         static char  lpfcinfobuf[384];
 889
 890         memset(lpfcinfobuf,0,384);
 891         if (phba && phba->pcidev){
 892                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
 893                 len = strlen(lpfcinfobuf);
 894                 snprintf(lpfcinfobuf + len,
 895                         384-len,
 896                         " on PCI bus %02x device %02x irq %d",
 897                         phba->pcidev->bus->number,
 898                         phba->pcidev->devfn,
 899                         phba->pcidev->irq);
 900                 len = strlen(lpfcinfobuf);
 901                 if (phba->Port[0]) {
 902                         snprintf(lpfcinfobuf + len,
 903                                  384-len,
 904                                  " port %s",
 905                                  phba->Port);
 906                 }
 907         }
 908         return lpfcinfobuf;
 909 }
 910
 911 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
 912 {
 913         unsigned long  poll_tmo_expires =
 914                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
 915
 916         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
 917                 mod_timer(&phba->fcp_poll_timer,
 918                           poll_tmo_expires);
 919 }
 920
 921 void lpfc_poll_start_timer(struct lpfc_hba * phba)
 922 {
 923         lpfc_poll_rearm_timer(phba);
 924 }
 925
 926 void lpfc_poll_timeout(unsigned long ptr)
 927 {
 928         struct lpfc_hba *phba = (struct lpfc_hba *) ptr;
 929
 930         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 931                 lpfc_sli_poll_fcp_ring (phba);
 932                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 933                         lpfc_poll_rearm_timer(phba);
 934         }
 935 }
 936
 937 static int
 938 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
 939 {
 940         struct Scsi_Host  *shost = cmnd->device->host;
 941         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
 942         struct lpfc_hba   *phba = vport->phba;
 943         struct lpfc_sli   *psli = &phba->sli;
 944         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
 945         struct lpfc_nodelist *ndlp = rdata->pnode;
 946         struct lpfc_scsi_buf *lpfc_cmd;
 947         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
 948         int err;
 949
 950         err = fc_remote_port_chkready(rport);
 951         if (err) {
 952                 cmnd->result = err;
 953                 goto out_fail_command;
 954         }
 955
 956         /*
 957          * Catch race where our node has transitioned, but the
 958          * transport is still transitioning.
 959          */
 960         if (!ndlp) {
 961                 cmnd->result = ScsiResult(DID_BUS_BUSY, 0);
 962                 goto out_fail_command;
 963         }
 964         lpfc_cmd = lpfc_get_scsi_buf(phba);
 965         if (lpfc_cmd == NULL) {
 966                 lpfc_adjust_queue_depth(phba);
 967
 968                 lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
 969                                 "%d (%d):0707 driver's buffer pool is empty, "
 970                                 "IO busied\n",
 971                                 phba->brd_no, vport->vpi);
 972                 goto out_host_busy;
 973         }
 974
 975         /*
 976          * Store the midlayer's command structure for the completion phase
 977          * and complete the command initialization.
 978          */
 979         lpfc_cmd->pCmd  = cmnd;
 980         lpfc_cmd->rdata = rdata;
 981         lpfc_cmd->timeout = 0;
 982         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
 983         cmnd->scsi_done = done;
 984
 985         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
 986         if (err)
 987                 goto out_host_busy_free_buf;
 988
 989         lpfc_scsi_prep_cmnd(vport, lpfc_cmd, ndlp);
 990
 991         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
 992                                   &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
 993         if (err)
 994                 goto out_host_busy_free_buf;
 995
 996         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
 997                 lpfc_sli_poll_fcp_ring(phba);
 998                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
 999                         lpfc_poll_rearm_timer(phba);
1000         }
1001
1002         return 0;
1003
1004  out_host_busy_free_buf:
1005         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
1006         lpfc_release_scsi_buf(phba, lpfc_cmd);
1007  out_host_busy:
1008         return SCSI_MLQUEUE_HOST_BUSY;
1009
1010  out_fail_command:
1011         done(cmnd);
1012         return 0;
1013 }
1014
1015 static void
1016 lpfc_block_error_handler(struct scsi_cmnd *cmnd)
1017 {
1018         struct Scsi_Host *shost = cmnd->device->host;
1019         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1020
1021         spin_lock_irq(shost->host_lock);
1022         while (rport->port_state == FC_PORTSTATE_BLOCKED) {
1023                 spin_unlock_irq(shost->host_lock);
1024                 msleep(1000);
1025                 spin_lock_irq(shost->host_lock);
1026         }
1027         spin_unlock_irq(shost->host_lock);
1028         return;
1029 }
1030
1031 static int
1032 lpfc_abort_handler(struct scsi_cmnd *cmnd)
1033 {
1034         struct Scsi_Host  *shost = cmnd->device->host;
1035         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
1036         struct lpfc_hba   *phba = vport->phba;
1037         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
1038         struct lpfc_iocbq *iocb;
1039         struct lpfc_iocbq *abtsiocb;
1040         struct lpfc_scsi_buf *lpfc_cmd;
1041         IOCB_t *cmd, *icmd;
1042         unsigned int loop_count = 0;
1043         int ret = SUCCESS;
1044
1045         lpfc_block_error_handler(cmnd);
1046         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
1047         BUG_ON(!lpfc_cmd);
1048
1049         /*
1050          * If pCmd field of the corresponding lpfc_scsi_buf structure
1051          * points to a different SCSI command, then the driver has
1052          * already completed this command, but the midlayer did not
1053          * see the completion before the eh fired.  Just return
1054          * SUCCESS.
1055          */
1056         iocb = &lpfc_cmd->cur_iocbq;
1057         if (lpfc_cmd->pCmd != cmnd)
1058                 goto out;
1059
1060         BUG_ON(iocb->context1 != lpfc_cmd);
1061
1062         abtsiocb = lpfc_sli_get_iocbq(phba);
1063         if (abtsiocb == NULL) {
1064                 ret = FAILED;
1065                 goto out;
1066         }
1067
1068         /*
1069          * The scsi command can not be in txq and it is in flight because the
1070          * pCmd is still pointig at the SCSI command we have to abort. There
1071          * is no need to search the txcmplq. Just send an abort to the FW.
1072          */
1073
1074         cmd = &iocb->iocb;
1075         icmd = &abtsiocb->iocb;
1076         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
1077         icmd->un.acxri.abortContextTag = cmd->ulpContext;
1078         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
1079
1080         icmd->ulpLe = 1;
1081         icmd->ulpClass = cmd->ulpClass;
1082         if (lpfc_is_link_up(phba))
1083                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
1084         else
1085                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
1086
1087         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
1088         abtsiocb->vport = vport;
1089         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
1090                 lpfc_sli_release_iocbq(phba, abtsiocb);
1091                 ret = FAILED;
1092                 goto out;
1093         }
1094
1095         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1096                 lpfc_sli_poll_fcp_ring (phba);
1097
1098         /* Wait for abort to complete */
1099         while (lpfc_cmd->pCmd == cmnd)
1100         {
1101                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1102                         lpfc_sli_poll_fcp_ring (phba);
1103
1104                 schedule_timeout_uninterruptible(LPFC_ABORT_WAIT * HZ);
1105                 if (++loop_count
1106                     > (2 * phba->cfg_devloss_tmo)/LPFC_ABORT_WAIT)
1107                         break;
1108         }
1109
1110         if (lpfc_cmd->pCmd == cmnd) {
1111                 ret = FAILED;
1112                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1113                                 "%d (%d):0748 abort handler timed out waiting "
1114                                 "for abort to complete: ret %#x, ID %d, "
1115                                 "LUN %d, snum %#lx\n",
1116                                 phba->brd_no, vport->vpi, ret,
1117                                 cmnd->device->id, cmnd->device->lun,
1118                                 cmnd->serial_number);
1119         }
1120
1121  out:
1122         lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1123                         "%d (%d):0749 SCSI Layer I/O Abort Request "
1124                         "Status x%x ID %d LUN %d snum %#lx\n",
1125                         phba->brd_no, vport->vpi, ret, cmnd->device->id,
1126                         cmnd->device->lun, cmnd->serial_number);
1127
1128         return ret;
1129 }
1130
1131 static int
1132 lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
1133 {
1134         struct Scsi_Host  *shost = cmnd->device->host;
1135         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
1136         struct lpfc_hba   *phba = vport->phba;
1137         struct lpfc_scsi_buf *lpfc_cmd;
1138         struct lpfc_iocbq *iocbq, *iocbqrsp;
1139         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
1140         struct lpfc_nodelist *pnode = rdata->pnode;
1141         uint32_t cmd_result = 0, cmd_status = 0;
1142         int ret = FAILED;
1143         int iocb_status = IOCB_SUCCESS;
1144         int cnt, loopcnt;
1145
1146         lpfc_block_error_handler(cmnd);
1147         loopcnt = 0;
1148         /*
1149          * If target is not in a MAPPED state, delay the reset until
1150          * target is rediscovered or devloss timeout expires.
1151          */
1152         while (1) {
1153                 if (!pnode)
1154                         goto out;
1155
1156                 if (pnode->nlp_state != NLP_STE_MAPPED_NODE) {
1157                         schedule_timeout_uninterruptible(msecs_to_jiffies(500));
1158                         loopcnt++;
1159                         rdata = cmnd->device->hostdata;
1160                         if (!rdata ||
1161                                 (loopcnt > ((phba->cfg_devloss_tmo * 2) + 1))) {
1162                                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1163                                                 "%d (%d):0721 LUN Reset rport "
1164                                                 "failure: cnt x%x rdata x%p\n",
1165                                                 phba->brd_no, vport->vpi,
1166                                                 loopcnt, rdata);
1167                                 goto out;
1168                         }
1169                         pnode = rdata->pnode;
1170                         if (!pnode)
1171                                 goto out;
1172                 }
1173                 if (pnode->nlp_state == NLP_STE_MAPPED_NODE)
1174                         break;
1175         }
1176
1177         lpfc_cmd = lpfc_get_scsi_buf(phba);
1178         if (lpfc_cmd == NULL)
1179                 goto out;
1180
1181         lpfc_cmd->timeout = 60;
1182         lpfc_cmd->rdata = rdata;
1183
1184         ret = lpfc_scsi_prep_task_mgmt_cmd(vport, lpfc_cmd, cmnd->device->lun,
1185                                            FCP_TARGET_RESET);
1186         if (!ret)
1187                 goto out_free_scsi_buf;
1188
1189         iocbq = &lpfc_cmd->cur_iocbq;
1190
1191         /* get a buffer for this IOCB command response */
1192         iocbqrsp = lpfc_sli_get_iocbq(phba);
1193         if (iocbqrsp == NULL)
1194                 goto out_free_scsi_buf;
1195
1196         lpfc_printf_log(phba, KERN_INFO, LOG_FCP,
1197                         "%d (%d):0703 Issue target reset to TGT %d LUN %d "
1198                         "rpi x%x nlp_flag x%x\n",
1199                         phba->brd_no, vport->vpi, cmnd->device->id,
1200                         cmnd->device->lun, pnode->nlp_rpi, pnode->nlp_flag);
1201
1202         iocb_status = lpfc_sli_issue_iocb_wait(phba,
1203                                        &phba->sli.ring[phba->sli.fcp_ring],
1204                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1205
1206         if (iocb_status == IOCB_TIMEDOUT)
1207                 iocbq->iocb_cmpl = lpfc_tskmgmt_def_cmpl;
1208
1209         if (iocb_status == IOCB_SUCCESS)
1210                 ret = SUCCESS;
1211         else
1212                 ret = iocb_status;
1213
1214         cmd_result = iocbqrsp->iocb.un.ulpWord[4];
1215         cmd_status = iocbqrsp->iocb.ulpStatus;
1216
1217         lpfc_sli_release_iocbq(phba, iocbqrsp);
1218
1219         /*
1220          * All outstanding txcmplq I/Os should have been aborted by the device.
1221          * Unfortunately, some targets do not abide by this forcing the driver
1222          * to double check.
1223          */
1224         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1225                                 cmnd->device->id, cmnd->device->lun,
1226                                 LPFC_CTX_LUN);
1227         if (cnt)
1228                 lpfc_sli_abort_iocb(phba,
1229                                     &phba->sli.ring[phba->sli.fcp_ring],
1230                                     cmnd->device->id, cmnd->device->lun,
1231                                     0, LPFC_CTX_LUN);
1232         loopcnt = 0;
1233         while(cnt) {
1234                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1235
1236                 if (++loopcnt
1237                     > (2 * phba->cfg_devloss_tmo)/LPFC_RESET_WAIT)
1238                         break;
1239
1240                 cnt = lpfc_sli_sum_iocb(phba,
1241                                         &phba->sli.ring[phba->sli.fcp_ring],
1242                                         cmnd->device->id, cmnd->device->lun,
1243                                         LPFC_CTX_LUN);
1244         }
1245
1246         if (cnt) {
1247                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1248                                 "%d (%d):0719 device reset I/O flush failure: "
1249                                 "cnt x%x\n",
1250                                 phba->brd_no, vport->vpi, cnt);
1251                 ret = FAILED;
1252         }
1253
1254 out_free_scsi_buf:
1255         if (iocb_status != IOCB_TIMEDOUT) {
1256                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1257         }
1258         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1259                         "%d (%d):0713 SCSI layer issued device reset (%d, %d) "
1260                         "return x%x status x%x result x%x\n",
1261                         phba->brd_no, vport->vpi, cmnd->device->id,
1262                         cmnd->device->lun, ret, cmd_status, cmd_result);
1263
1264 out:
1265         return ret;
1266 }
1267
1268 static int
1269 lpfc_bus_reset_handler(struct scsi_cmnd *cmnd)
1270 {
1271         struct Scsi_Host  *shost = cmnd->device->host;
1272         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
1273         struct lpfc_hba   *phba = vport->phba;
1274         struct lpfc_nodelist *ndlp = NULL;
1275         int match;
1276         int ret = FAILED, i, err_count = 0;
1277         int cnt, loopcnt;
1278         struct lpfc_scsi_buf * lpfc_cmd;
1279
1280         lpfc_block_error_handler(cmnd);
1281
1282         lpfc_cmd = lpfc_get_scsi_buf(phba);
1283         if (lpfc_cmd == NULL)
1284                 goto out;
1285
1286         /* The lpfc_cmd storage is reused.  Set all loop invariants. */
1287         lpfc_cmd->timeout = 60;
1288
1289         /*
1290          * Since the driver manages a single bus device, reset all
1291          * targets known to the driver.  Should any target reset
1292          * fail, this routine returns failure to the midlayer.
1293          */
1294         for (i = 0; i < LPFC_MAX_TARGET; i++) {
1295                 /* Search for mapped node by target ID */
1296                 match = 0;
1297                 spin_lock_irq(shost->host_lock);
1298                 list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {
1299                         if (ndlp->nlp_state == NLP_STE_MAPPED_NODE &&
1300                             i == ndlp->nlp_sid &&
1301                             ndlp->rport) {
1302                                 match = 1;
1303                                 break;
1304                         }
1305                 }
1306                 spin_unlock_irq(shost->host_lock);
1307                 if (!match)
1308                         continue;
1309
1310                 ret = lpfc_scsi_tgt_reset(lpfc_cmd, vport, i,
1311                                           cmnd->device->lun,
1312                                           ndlp->rport->dd_data);
1313                 if (ret != SUCCESS) {
1314                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1315                                         "%d (%d):0700 Bus Reset on target %d "
1316                                         "failed\n",
1317                                         phba->brd_no, vport->vpi, i);
1318                         err_count++;
1319                         break;
1320                 }
1321         }
1322
1323         if (ret != IOCB_TIMEDOUT)
1324                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1325
1326         if (err_count == 0)
1327                 ret = SUCCESS;
1328         else
1329                 ret = FAILED;
1330
1331         /*
1332          * All outstanding txcmplq I/Os should have been aborted by
1333          * the targets.  Unfortunately, some targets do not abide by
1334          * this forcing the driver to double check.
1335          */
1336         cnt = lpfc_sli_sum_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1337                                 0, 0, LPFC_CTX_HOST);
1338         if (cnt)
1339                 lpfc_sli_abort_iocb(phba, &phba->sli.ring[phba->sli.fcp_ring],
1340                                     0, 0, 0, LPFC_CTX_HOST);
1341         loopcnt = 0;
1342         while(cnt) {
1343                 schedule_timeout_uninterruptible(LPFC_RESET_WAIT*HZ);
1344
1345                 if (++loopcnt
1346                     > (2 * phba->cfg_devloss_tmo)/LPFC_RESET_WAIT)
1347                         break;
1348
1349                 cnt = lpfc_sli_sum_iocb(phba,
1350                                         &phba->sli.ring[phba->sli.fcp_ring],
1351                                         0, 0, LPFC_CTX_HOST);
1352         }
1353
1354         if (cnt) {
1355                 lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1356                                 "%d (%d):0715 Bus Reset I/O flush failure: "
1357                                 "cnt x%x left x%x\n",
1358                                 phba->brd_no, vport->vpi, cnt, i);
1359                 ret = FAILED;
1360         }
1361
1362         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1363                         "%d (%d):0714 SCSI layer issued Bus Reset Data: x%x\n",
1364                         phba->brd_no, vport->vpi, ret);
1365 out:
1366         return ret;
1367 }
1368
1369 static int
1370 lpfc_slave_alloc(struct scsi_device *sdev)
1371 {
1372         struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
1373         struct lpfc_hba   *phba = vport->phba;
1374         struct lpfc_scsi_buf *scsi_buf = NULL;
1375         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1376         uint32_t total = 0, i;
1377         uint32_t num_to_alloc = 0;
1378         unsigned long flags;
1379
1380         if (!rport || fc_remote_port_chkready(rport))
1381                 return -ENXIO;
1382
1383         sdev->hostdata = rport->dd_data;
1384
1385         /*
1386          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1387          * available list of scsi buffers.  Don't allocate more than the
1388          * HBA limit conveyed to the midlayer via the host structure.  The
1389          * formula accounts for the lun_queue_depth + error handlers + 1
1390          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1391          */
1392         total = phba->total_scsi_bufs;
1393         num_to_alloc = phba->cfg_lun_queue_depth + 2;
1394
1395         /* Allow some exchanges to be available always to complete discovery */
1396         if (total >= phba->cfg_hba_queue_depth - LPFC_DISC_IOCB_BUFF_COUNT ) {
1397                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1398                                 "%d (%d):0704 At limitation of %d "
1399                                 "preallocated command buffers\n",
1400                                 phba->brd_no, vport->vpi, total);
1401                 return 0;
1402
1403         /* Allow some exchanges to be available always to complete discovery */
1404         } else if (total + num_to_alloc >
1405                 phba->cfg_hba_queue_depth - LPFC_DISC_IOCB_BUFF_COUNT ) {
1406                 lpfc_printf_log(phba, KERN_WARNING, LOG_FCP,
1407                                 "%d (%d):0705 Allocation request of %d "
1408                                 "command buffers will exceed max of %d.  "
1409                                 "Reducing allocation request to %d.\n",
1410                                 phba->brd_no, vport->vpi, num_to_alloc,
1411                                 phba->cfg_hba_queue_depth,
1412                                 (phba->cfg_hba_queue_depth - total));
1413                 num_to_alloc = phba->cfg_hba_queue_depth - total;
1414         }
1415
1416         for (i = 0; i < num_to_alloc; i++) {
1417                 scsi_buf = lpfc_new_scsi_buf(vport);
1418                 if (!scsi_buf) {
1419                         lpfc_printf_log(phba, KERN_ERR, LOG_FCP,
1420                                         "%d (%d):0706 Failed to allocate "
1421                                         "command buffer\n",
1422                                         phba->brd_no, vport->vpi);
1423                         break;
1424                 }
1425
1426                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
1427                 phba->total_scsi_bufs++;
1428                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
1429                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
1430         }
1431         return 0;
1432 }
1433
1434 static int
1435 lpfc_slave_configure(struct scsi_device *sdev)
1436 {
1437         struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
1438         struct lpfc_hba   *phba = vport->phba;
1439         struct fc_rport   *rport = starget_to_rport(sdev->sdev_target);
1440
1441         if (sdev->tagged_supported)
1442                 scsi_activate_tcq(sdev, phba->cfg_lun_queue_depth);
1443         else
1444                 scsi_deactivate_tcq(sdev, phba->cfg_lun_queue_depth);
1445
1446         /*
1447          * Initialize the fc transport attributes for the target
1448          * containing this scsi device.  Also note that the driver's
1449          * target pointer is stored in the starget_data for the
1450          * driver's sysfs entry point functions.
1451          */
1452         rport->dev_loss_tmo = phba->cfg_devloss_tmo;
1453
1454         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1455                 lpfc_sli_poll_fcp_ring(phba);
1456                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1457                         lpfc_poll_rearm_timer(phba);
1458         }
1459
1460         return 0;
1461 }
1462
1463 static void
1464 lpfc_slave_destroy(struct scsi_device *sdev)
1465 {
1466         sdev->hostdata = NULL;
1467         return;
1468 }
1469
1470
1471 struct scsi_host_template lpfc_template = {
1472         .module                 = THIS_MODULE,
1473         .name                   = LPFC_DRIVER_NAME,
1474         .info                   = lpfc_info,
1475         .queuecommand           = lpfc_queuecommand,
1476         .eh_abort_handler       = lpfc_abort_handler,
1477         .eh_device_reset_handler= lpfc_device_reset_handler,
1478         .eh_bus_reset_handler   = lpfc_bus_reset_handler,
1479         .slave_alloc            = lpfc_slave_alloc,
1480         .slave_configure        = lpfc_slave_configure,
1481         .slave_destroy          = lpfc_slave_destroy,
1482         .scan_finished          = lpfc_scan_finished,
1483         .this_id                = -1,
1484         .sg_tablesize           = LPFC_SG_SEG_CNT,
1485         .cmd_per_lun            = LPFC_CMD_PER_LUN,
1486         .use_clustering         = ENABLE_CLUSTERING,
1487         .shost_attrs            = lpfc_hba_attrs,
1488         .max_sectors            = 0xFFFF,
1489 };