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) 2004-2008 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_nl.h"
  36 #include "lpfc_disc.h"
  37 #include "lpfc_scsi.h"
  38 #include "lpfc.h"
  39 #include "lpfc_logmsg.h"
  40 #include "lpfc_crtn.h"
  41 #include "lpfc_vport.h"
  42
  43 #define LPFC_RESET_WAIT  2
  44 #define LPFC_ABORT_WAIT  2
  45
  46 /**
  47  * lpfc_update_stats: Update statistical data for the command completion.
  48  * @phba: Pointer to HBA object.
  49  * @lpfc_cmd: lpfc scsi command object pointer.
  50  *
  51  * This function is called when there is a command completion and this
  52  * function updates the statistical data for the command completion.
  53  **/
  54 static void
  55 lpfc_update_stats(struct lpfc_hba *phba, struct  lpfc_scsi_buf *lpfc_cmd)
  56 {
  57         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
  58         struct lpfc_nodelist *pnode = rdata->pnode;
  59         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
  60         unsigned long flags;
  61         struct Scsi_Host  *shost = cmd->device->host;
  62         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
  63         unsigned long latency;
  64         int i;
  65
  66         if (cmd->result)
  67                 return;
  68
  69         spin_lock_irqsave(shost->host_lock, flags);
  70         if (!vport->stat_data_enabled ||
  71                 vport->stat_data_blocked ||
  72                 !pnode->lat_data ||
  73                 (phba->bucket_type == LPFC_NO_BUCKET)) {
  74                 spin_unlock_irqrestore(shost->host_lock, flags);
  75                 return;
  76         }
  77         latency = jiffies_to_msecs(jiffies - lpfc_cmd->start_time);
  78
  79         if (phba->bucket_type == LPFC_LINEAR_BUCKET) {
  80                 i = (latency + phba->bucket_step - 1 - phba->bucket_base)/
  81                         phba->bucket_step;
  82                 if (i >= LPFC_MAX_BUCKET_COUNT)
  83                         i = LPFC_MAX_BUCKET_COUNT;
  84         } else {
  85                 for (i = 0; i < LPFC_MAX_BUCKET_COUNT-1; i++)
  86                         if (latency <= (phba->bucket_base +
  87                                 ((1<<i)*phba->bucket_step)))
  88                                 break;
  89         }
  90
  91         pnode->lat_data[i].cmd_count++;
  92         spin_unlock_irqrestore(shost->host_lock, flags);
  93 }
  94
  95 /**
  96  * lpfc_send_sdev_queuedepth_change_event: Posts a queuedepth change
  97  *                   event.
  98  * @phba: Pointer to HBA context object.
  99  * @vport: Pointer to vport object.
 100  * @ndlp: Pointer to FC node associated with the target.
 101  * @lun: Lun number of the scsi device.
 102  * @old_val: Old value of the queue depth.
 103  * @new_val: New value of the queue depth.
 104  *
 105  * This function sends an event to the mgmt application indicating
 106  * there is a change in the scsi device queue depth.
 107  **/
 108 static void
 109 lpfc_send_sdev_queuedepth_change_event(struct lpfc_hba *phba,
 110                 struct lpfc_vport  *vport,
 111                 struct lpfc_nodelist *ndlp,
 112                 uint32_t lun,
 113                 uint32_t old_val,
 114                 uint32_t new_val)
 115 {
 116         struct lpfc_fast_path_event *fast_path_evt;
 117         unsigned long flags;
 118
 119         fast_path_evt = lpfc_alloc_fast_evt(phba);
 120         if (!fast_path_evt)
 121                 return;
 122
 123         fast_path_evt->un.queue_depth_evt.scsi_event.event_type =
 124                 FC_REG_SCSI_EVENT;
 125         fast_path_evt->un.queue_depth_evt.scsi_event.subcategory =
 126                 LPFC_EVENT_VARQUEDEPTH;
 127
 128         /* Report all luns with change in queue depth */
 129         fast_path_evt->un.queue_depth_evt.scsi_event.lun = lun;
 130         if (ndlp && NLP_CHK_NODE_ACT(ndlp)) {
 131                 memcpy(&fast_path_evt->un.queue_depth_evt.scsi_event.wwpn,
 132                         &ndlp->nlp_portname, sizeof(struct lpfc_name));
 133                 memcpy(&fast_path_evt->un.queue_depth_evt.scsi_event.wwnn,
 134                         &ndlp->nlp_nodename, sizeof(struct lpfc_name));
 135         }
 136
 137         fast_path_evt->un.queue_depth_evt.oldval = old_val;
 138         fast_path_evt->un.queue_depth_evt.newval = new_val;
 139         fast_path_evt->vport = vport;
 140
 141         fast_path_evt->work_evt.evt = LPFC_EVT_FASTPATH_MGMT_EVT;
 142         spin_lock_irqsave(&phba->hbalock, flags);
 143         list_add_tail(&fast_path_evt->work_evt.evt_listp, &phba->work_list);
 144         spin_unlock_irqrestore(&phba->hbalock, flags);
 145         lpfc_worker_wake_up(phba);
 146
 147         return;
 148 }
 149
 150 /**
 151  * lpfc_rampdown_queue_depth: Post RAMP_DOWN_QUEUE event to worker thread.
 152  * @phba: The Hba for which this call is being executed.
 153  *
 154  * This routine is called when there is resource error in driver or firmware.
 155  * This routine posts WORKER_RAMP_DOWN_QUEUE event for @phba. This routine
 156  * posts at most 1 event each second. This routine wakes up worker thread of
 157  * @phba to process WORKER_RAM_DOWN_EVENT event.
 158  *
 159  * This routine should be called with no lock held.
 160  **/
 161 void
 162 lpfc_rampdown_queue_depth(struct lpfc_hba *phba)
 163 {
 164         unsigned long flags;
 165         uint32_t evt_posted;
 166
 167         spin_lock_irqsave(&phba->hbalock, flags);
 168         atomic_inc(&phba->num_rsrc_err);
 169         phba->last_rsrc_error_time = jiffies;
 170
 171         if ((phba->last_ramp_down_time + QUEUE_RAMP_DOWN_INTERVAL) > jiffies) {
 172                 spin_unlock_irqrestore(&phba->hbalock, flags);
 173                 return;
 174         }
 175
 176         phba->last_ramp_down_time = jiffies;
 177
 178         spin_unlock_irqrestore(&phba->hbalock, flags);
 179
 180         spin_lock_irqsave(&phba->pport->work_port_lock, flags);
 181         evt_posted = phba->pport->work_port_events & WORKER_RAMP_DOWN_QUEUE;
 182         if (!evt_posted)
 183                 phba->pport->work_port_events |= WORKER_RAMP_DOWN_QUEUE;
 184         spin_unlock_irqrestore(&phba->pport->work_port_lock, flags);
 185
 186         if (!evt_posted)
 187                 lpfc_worker_wake_up(phba);
 188         return;
 189 }
 190
 191 /**
 192  * lpfc_rampup_queue_depth: Post RAMP_UP_QUEUE event for worker thread.
 193  * @phba: The Hba for which this call is being executed.
 194  *
 195  * This routine post WORKER_RAMP_UP_QUEUE event for @phba vport. This routine
 196  * post at most 1 event every 5 minute after last_ramp_up_time or
 197  * last_rsrc_error_time.  This routine wakes up worker thread of @phba
 198  * to process WORKER_RAM_DOWN_EVENT event.
 199  *
 200  * This routine should be called with no lock held.
 201  **/
 202 static inline void
 203 lpfc_rampup_queue_depth(struct lpfc_vport  *vport,
 204                         struct scsi_device *sdev)
 205 {
 206         unsigned long flags;
 207         struct lpfc_hba *phba = vport->phba;
 208         uint32_t evt_posted;
 209         atomic_inc(&phba->num_cmd_success);
 210
 211         if (vport->cfg_lun_queue_depth <= sdev->queue_depth)
 212                 return;
 213         spin_lock_irqsave(&phba->hbalock, flags);
 214         if (((phba->last_ramp_up_time + QUEUE_RAMP_UP_INTERVAL) > jiffies) ||
 215          ((phba->last_rsrc_error_time + QUEUE_RAMP_UP_INTERVAL ) > jiffies)) {
 216                 spin_unlock_irqrestore(&phba->hbalock, flags);
 217                 return;
 218         }
 219         phba->last_ramp_up_time = jiffies;
 220         spin_unlock_irqrestore(&phba->hbalock, flags);
 221
 222         spin_lock_irqsave(&phba->pport->work_port_lock, flags);
 223         evt_posted = phba->pport->work_port_events & WORKER_RAMP_UP_QUEUE;
 224         if (!evt_posted)
 225                 phba->pport->work_port_events |= WORKER_RAMP_UP_QUEUE;
 226         spin_unlock_irqrestore(&phba->pport->work_port_lock, flags);
 227
 228         if (!evt_posted)
 229                 lpfc_worker_wake_up(phba);
 230         return;
 231 }
 232
 233 /**
 234  * lpfc_ramp_down_queue_handler: WORKER_RAMP_DOWN_QUEUE event handler.
 235  * @phba: The Hba for which this call is being executed.
 236  *
 237  * This routine is called to  process WORKER_RAMP_DOWN_QUEUE event for worker
 238  * thread.This routine reduces queue depth for all scsi device on each vport
 239  * associated with @phba.
 240  **/
 241 void
 242 lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
 243 {
 244         struct lpfc_vport **vports;
 245         struct Scsi_Host  *shost;
 246         struct scsi_device *sdev;
 247         unsigned long new_queue_depth, old_queue_depth;
 248         unsigned long num_rsrc_err, num_cmd_success;
 249         int i;
 250         struct lpfc_rport_data *rdata;
 251
 252         num_rsrc_err = atomic_read(&phba->num_rsrc_err);
 253         num_cmd_success = atomic_read(&phba->num_cmd_success);
 254
 255         vports = lpfc_create_vport_work_array(phba);
 256         if (vports != NULL)
 257                 for(i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
 258                         shost = lpfc_shost_from_vport(vports[i]);
 259                         shost_for_each_device(sdev, shost) {
 260                                 new_queue_depth =
 261                                         sdev->queue_depth * num_rsrc_err /
 262                                         (num_rsrc_err + num_cmd_success);
 263                                 if (!new_queue_depth)
 264                                         new_queue_depth = sdev->queue_depth - 1;
 265                                 else
 266                                         new_queue_depth = sdev->queue_depth -
 267                                                                 new_queue_depth;
 268                                 old_queue_depth = sdev->queue_depth;
 269                                 if (sdev->ordered_tags)
 270                                         scsi_adjust_queue_depth(sdev,
 271                                                         MSG_ORDERED_TAG,
 272                                                         new_queue_depth);
 273                                 else
 274                                         scsi_adjust_queue_depth(sdev,
 275                                                         MSG_SIMPLE_TAG,
 276                                                         new_queue_depth);
 277                                 rdata = sdev->hostdata;
 278                                 if (rdata)
 279                                         lpfc_send_sdev_queuedepth_change_event(
 280                                                 phba, vports[i],
 281                                                 rdata->pnode,
 282                                                 sdev->lun, old_queue_depth,
 283                                                 new_queue_depth);
 284                         }
 285                 }
 286         lpfc_destroy_vport_work_array(phba, vports);
 287         atomic_set(&phba->num_rsrc_err, 0);
 288         atomic_set(&phba->num_cmd_success, 0);
 289 }
 290
 291 /**
 292  * lpfc_ramp_up_queue_handler: WORKER_RAMP_UP_QUEUE event handler.
 293  * @phba: The Hba for which this call is being executed.
 294  *
 295  * This routine is called to  process WORKER_RAMP_UP_QUEUE event for worker
 296  * thread.This routine increases queue depth for all scsi device on each vport
 297  * associated with @phba by 1. This routine also sets @phba num_rsrc_err and
 298  * num_cmd_success to zero.
 299  **/
 300 void
 301 lpfc_ramp_up_queue_handler(struct lpfc_hba *phba)
 302 {
 303         struct lpfc_vport **vports;
 304         struct Scsi_Host  *shost;
 305         struct scsi_device *sdev;
 306         int i;
 307         struct lpfc_rport_data *rdata;
 308
 309         vports = lpfc_create_vport_work_array(phba);
 310         if (vports != NULL)
 311                 for(i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
 312                         shost = lpfc_shost_from_vport(vports[i]);
 313                         shost_for_each_device(sdev, shost) {
 314                                 if (vports[i]->cfg_lun_queue_depth <=
 315                                     sdev->queue_depth)
 316                                         continue;
 317                                 if (sdev->ordered_tags)
 318                                         scsi_adjust_queue_depth(sdev,
 319                                                         MSG_ORDERED_TAG,
 320                                                         sdev->queue_depth+1);
 321                                 else
 322                                         scsi_adjust_queue_depth(sdev,
 323                                                         MSG_SIMPLE_TAG,
 324                                                         sdev->queue_depth+1);
 325                                 rdata = sdev->hostdata;
 326                                 if (rdata)
 327                                         lpfc_send_sdev_queuedepth_change_event(
 328                                                 phba, vports[i],
 329                                                 rdata->pnode,
 330                                                 sdev->lun,
 331                                                 sdev->queue_depth - 1,
 332                                                 sdev->queue_depth);
 333                         }
 334                 }
 335         lpfc_destroy_vport_work_array(phba, vports);
 336         atomic_set(&phba->num_rsrc_err, 0);
 337         atomic_set(&phba->num_cmd_success, 0);
 338 }
 339
 340 /**
 341  * lpfc_scsi_dev_block: set all scsi hosts to block state.
 342  * @phba: Pointer to HBA context object.
 343  *
 344  * This function walks vport list and set each SCSI host to block state
 345  * by invoking fc_remote_port_delete() routine. This function is invoked
 346  * with EEH when device's PCI slot has been permanently disabled.
 347  **/
 348 void
 349 lpfc_scsi_dev_block(struct lpfc_hba *phba)
 350 {
 351         struct lpfc_vport **vports;
 352         struct Scsi_Host  *shost;
 353         struct scsi_device *sdev;
 354         struct fc_rport *rport;
 355         int i;
 356
 357         vports = lpfc_create_vport_work_array(phba);
 358         if (vports != NULL)
 359                 for (i = 0; i <= phba->max_vpi && vports[i] != NULL; i++) {
 360                         shost = lpfc_shost_from_vport(vports[i]);
 361                         shost_for_each_device(sdev, shost) {
 362                                 rport = starget_to_rport(scsi_target(sdev));
 363                                 fc_remote_port_delete(rport);
 364                         }
 365                 }
 366         lpfc_destroy_vport_work_array(phba, vports);
 367 }
 368
 369 /**
 370  * lpfc_new_scsi_buf: Scsi buffer allocator.
 371  * @vport: The virtual port for which this call being executed.
 372  *
 373  * This routine allocates a scsi buffer, which contains all the necessary
 374  * information needed to initiate a SCSI I/O.  The non-DMAable buffer region
 375  * contains information to build the IOCB.  The DMAable region contains
 376  * memory for the FCP CMND, FCP RSP, and the initial BPL.  In addition to
 377  * allocating memory, the FCP CMND and FCP RSP BDEs are setup in the BPL
 378  * and the BPL BDE is setup in the IOCB.
 379  *
 380  * Return codes:
 381  *   NULL - Error
 382  *   Pointer to lpfc_scsi_buf data structure - Success
 383  **/
 384 static struct lpfc_scsi_buf *
 385 lpfc_new_scsi_buf(struct lpfc_vport *vport)
 386 {
 387         struct lpfc_hba *phba = vport->phba;
 388         struct lpfc_scsi_buf *psb;
 389         struct ulp_bde64 *bpl;
 390         IOCB_t *iocb;
 391         dma_addr_t pdma_phys_fcp_cmd;
 392         dma_addr_t pdma_phys_fcp_rsp;
 393         dma_addr_t pdma_phys_bpl;
 394         uint16_t iotag;
 395
 396         psb = kzalloc(sizeof(struct lpfc_scsi_buf), GFP_KERNEL);
 397         if (!psb)
 398                 return NULL;
 399
 400         /*
 401          * Get memory from the pci pool to map the virt space to pci bus space
 402          * for an I/O.  The DMA buffer includes space for the struct fcp_cmnd,
 403          * struct fcp_rsp and the number of bde's necessary to support the
 404          * sg_tablesize.
 405          */
 406         psb->data = pci_pool_alloc(phba->lpfc_scsi_dma_buf_pool, GFP_KERNEL,
 407                                                         &psb->dma_handle);
 408         if (!psb->data) {
 409                 kfree(psb);
 410                 return NULL;
 411         }
 412
 413         /* Initialize virtual ptrs to dma_buf region. */
 414         memset(psb->data, 0, phba->cfg_sg_dma_buf_size);
 415
 416         /* Allocate iotag for psb->cur_iocbq. */
 417         iotag = lpfc_sli_next_iotag(phba, &psb->cur_iocbq);
 418         if (iotag == 0) {
 419                 pci_pool_free(phba->lpfc_scsi_dma_buf_pool,
 420                               psb->data, psb->dma_handle);
 421                 kfree (psb);
 422                 return NULL;
 423         }
 424         psb->cur_iocbq.iocb_flag |= LPFC_IO_FCP;
 425
 426         psb->fcp_cmnd = psb->data;
 427         psb->fcp_rsp = psb->data + sizeof(struct fcp_cmnd);
 428         psb->fcp_bpl = psb->data + sizeof(struct fcp_cmnd) +
 429                                                         sizeof(struct fcp_rsp);
 430
 431         /* Initialize local short-hand pointers. */
 432         bpl = psb->fcp_bpl;
 433         pdma_phys_fcp_cmd = psb->dma_handle;
 434         pdma_phys_fcp_rsp = psb->dma_handle + sizeof(struct fcp_cmnd);
 435         pdma_phys_bpl = psb->dma_handle + sizeof(struct fcp_cmnd) +
 436                         sizeof(struct fcp_rsp);
 437
 438         /*
 439          * The first two bdes are the FCP_CMD and FCP_RSP.  The balance are sg
 440          * list bdes.  Initialize the first two and leave the rest for
 441          * queuecommand.
 442          */
 443         bpl[0].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_cmd));
 444         bpl[0].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_cmd));
 445         bpl[0].tus.f.bdeSize = sizeof(struct fcp_cmnd);
 446         bpl[0].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
 447         bpl[0].tus.w = le32_to_cpu(bpl->tus.w);
 448
 449         /* Setup the physical region for the FCP RSP */
 450         bpl[1].addrHigh = le32_to_cpu(putPaddrHigh(pdma_phys_fcp_rsp));
 451         bpl[1].addrLow = le32_to_cpu(putPaddrLow(pdma_phys_fcp_rsp));
 452         bpl[1].tus.f.bdeSize = sizeof(struct fcp_rsp);
 453         bpl[1].tus.f.bdeFlags = BUFF_TYPE_BDE_64;
 454         bpl[1].tus.w = le32_to_cpu(bpl->tus.w);
 455
 456         /*
 457          * Since the IOCB for the FCP I/O is built into this lpfc_scsi_buf,
 458          * initialize it with all known data now.
 459          */
 460         iocb = &psb->cur_iocbq.iocb;
 461         iocb->un.fcpi64.bdl.ulpIoTag32 = 0;
 462         if (phba->sli_rev == 3) {
 463                 /* fill in immediate fcp command BDE */
 464                 iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BDE_IMMED;
 465                 iocb->un.fcpi64.bdl.bdeSize = sizeof(struct fcp_cmnd);
 466                 iocb->un.fcpi64.bdl.addrLow = offsetof(IOCB_t,
 467                                                        unsli3.fcp_ext.icd);
 468                 iocb->un.fcpi64.bdl.addrHigh = 0;
 469                 iocb->ulpBdeCount = 0;
 470                 iocb->ulpLe = 0;
 471                 /* fill in responce BDE */
 472                 iocb->unsli3.fcp_ext.rbde.tus.f.bdeFlags = BUFF_TYPE_BDE_64;
 473                 iocb->unsli3.fcp_ext.rbde.tus.f.bdeSize =
 474                                                 sizeof(struct fcp_rsp);
 475                 iocb->unsli3.fcp_ext.rbde.addrLow =
 476                                                 putPaddrLow(pdma_phys_fcp_rsp);
 477                 iocb->unsli3.fcp_ext.rbde.addrHigh =
 478                                                 putPaddrHigh(pdma_phys_fcp_rsp);
 479         } else {
 480                 iocb->un.fcpi64.bdl.bdeFlags = BUFF_TYPE_BLP_64;
 481                 iocb->un.fcpi64.bdl.bdeSize = (2 * sizeof(struct ulp_bde64));
 482                 iocb->un.fcpi64.bdl.addrLow = putPaddrLow(pdma_phys_bpl);
 483                 iocb->un.fcpi64.bdl.addrHigh = putPaddrHigh(pdma_phys_bpl);
 484                 iocb->ulpBdeCount = 1;
 485                 iocb->ulpLe = 1;
 486         }
 487         iocb->ulpClass = CLASS3;
 488
 489         return psb;
 490 }
 491
 492 /**
 493  * lpfc_get_scsi_buf: Get a scsi buffer from lpfc_scsi_buf_list list of Hba.
 494  * @phba: The Hba for which this call is being executed.
 495  *
 496  * This routine removes a scsi buffer from head of @phba lpfc_scsi_buf_list list
 497  * and returns to caller.
 498  *
 499  * Return codes:
 500  *   NULL - Error
 501  *   Pointer to lpfc_scsi_buf - Success
 502  **/
 503 static struct lpfc_scsi_buf*
 504 lpfc_get_scsi_buf(struct lpfc_hba * phba)
 505 {
 506         struct  lpfc_scsi_buf * lpfc_cmd = NULL;
 507         struct list_head *scsi_buf_list = &phba->lpfc_scsi_buf_list;
 508         unsigned long iflag = 0;
 509
 510         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 511         list_remove_head(scsi_buf_list, lpfc_cmd, struct lpfc_scsi_buf, list);
 512         if (lpfc_cmd) {
 513                 lpfc_cmd->seg_cnt = 0;
 514                 lpfc_cmd->nonsg_phys = 0;
 515         }
 516         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 517         return  lpfc_cmd;
 518 }
 519
 520 /**
 521  * lpfc_release_scsi_buf: Return a scsi buffer back to hba lpfc_scsi_buf_list list.
 522  * @phba: The Hba for which this call is being executed.
 523  * @psb: The scsi buffer which is being released.
 524  *
 525  * This routine releases @psb scsi buffer by adding it to tail of @phba
 526  * lpfc_scsi_buf_list list.
 527  **/
 528 static void
 529 lpfc_release_scsi_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *psb)
 530 {
 531         unsigned long iflag = 0;
 532
 533         spin_lock_irqsave(&phba->scsi_buf_list_lock, iflag);
 534         psb->pCmd = NULL;
 535         list_add_tail(&psb->list, &phba->lpfc_scsi_buf_list);
 536         spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
 537 }
 538
 539 /**
 540  * lpfc_scsi_prep_dma_buf: Routine to do DMA mapping for scsi buffer.
 541  * @phba: The Hba for which this call is being executed.
 542  * @lpfc_cmd: The scsi buffer which is going to be mapped.
 543  *
 544  * This routine does the pci dma mapping for scatter-gather list of scsi cmnd
 545  * field of @lpfc_cmd. This routine scans through sg elements and format the
 546  * bdea. This routine also initializes all IOCB fields which are dependent on
 547  * scsi command request buffer.
 548  *
 549  * Return codes:
 550  *   1 - Error
 551  *   0 - Success
 552  **/
 553 static int
 554 lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
 555 {
 556         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
 557         struct scatterlist *sgel = NULL;
 558         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
 559         struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
 560         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
 561         struct ulp_bde64 *data_bde = iocb_cmd->unsli3.fcp_ext.dbde;
 562         dma_addr_t physaddr;
 563         uint32_t num_bde = 0;
 564         int nseg, datadir = scsi_cmnd->sc_data_direction;
 565
 566         /*
 567          * There are three possibilities here - use scatter-gather segment, use
 568          * the single mapping, or neither.  Start the lpfc command prep by
 569          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
 570          * data bde entry.
 571          */
 572         bpl += 2;
 573         if (scsi_sg_count(scsi_cmnd)) {
 574                 /*
 575                  * The driver stores the segment count returned from pci_map_sg
 576                  * because this a count of dma-mappings used to map the use_sg
 577                  * pages.  They are not guaranteed to be the same for those
 578                  * architectures that implement an IOMMU.
 579                  */
 580
 581                 nseg = dma_map_sg(&phba->pcidev->dev, scsi_sglist(scsi_cmnd),
 582                                   scsi_sg_count(scsi_cmnd), datadir);
 583                 if (unlikely(!nseg))
 584                         return 1;
 585
 586                 lpfc_cmd->seg_cnt = nseg;
 587                 if (lpfc_cmd->seg_cnt > phba->cfg_sg_seg_cnt) {
 588                         printk(KERN_ERR "%s: Too many sg segments from "
 589                                "dma_map_sg.  Config %d, seg_cnt %d",
 590                                __func__, phba->cfg_sg_seg_cnt,
 591                                lpfc_cmd->seg_cnt);
 592                         scsi_dma_unmap(scsi_cmnd);
 593                         return 1;
 594                 }
 595
 596                 /*
 597                  * The driver established a maximum scatter-gather segment count
 598                  * during probe that limits the number of sg elements in any
 599                  * single scsi command.  Just run through the seg_cnt and format
 600                  * the bde's.
 601                  * When using SLI-3 the driver will try to fit all the BDEs into
 602                  * the IOCB. If it can't then the BDEs get added to a BPL as it
 603                  * does for SLI-2 mode.
 604                  */
 605                 scsi_for_each_sg(scsi_cmnd, sgel, nseg, num_bde) {
 606                         physaddr = sg_dma_address(sgel);
 607                         if (phba->sli_rev == 3 &&
 608                             nseg <= LPFC_EXT_DATA_BDE_COUNT) {
 609                                 data_bde->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
 610                                 data_bde->tus.f.bdeSize = sg_dma_len(sgel);
 611                                 data_bde->addrLow = putPaddrLow(physaddr);
 612                                 data_bde->addrHigh = putPaddrHigh(physaddr);
 613                                 data_bde++;
 614                         } else {
 615                                 bpl->tus.f.bdeFlags = BUFF_TYPE_BDE_64;
 616                                 bpl->tus.f.bdeSize = sg_dma_len(sgel);
 617                                 bpl->tus.w = le32_to_cpu(bpl->tus.w);
 618                                 bpl->addrLow =
 619                                         le32_to_cpu(putPaddrLow(physaddr));
 620                                 bpl->addrHigh =
 621                                         le32_to_cpu(putPaddrHigh(physaddr));
 622                                 bpl++;
 623                         }
 624                 }
 625         }
 626
 627         /*
 628          * Finish initializing those IOCB fields that are dependent on the
 629          * scsi_cmnd request_buffer.  Note that for SLI-2 the bdeSize is
 630          * explicitly reinitialized and for SLI-3 the extended bde count is
 631          * explicitly reinitialized since all iocb memory resources are reused.
 632          */
 633         if (phba->sli_rev == 3) {
 634                 if (num_bde > LPFC_EXT_DATA_BDE_COUNT) {
 635                         /*
 636                          * The extended IOCB format can only fit 3 BDE or a BPL.
 637                          * This I/O has more than 3 BDE so the 1st data bde will
 638                          * be a BPL that is filled in here.
 639                          */
 640                         physaddr = lpfc_cmd->dma_handle;
 641                         data_bde->tus.f.bdeFlags = BUFF_TYPE_BLP_64;
 642                         data_bde->tus.f.bdeSize = (num_bde *
 643                                                    sizeof(struct ulp_bde64));
 644                         physaddr += (sizeof(struct fcp_cmnd) +
 645                                      sizeof(struct fcp_rsp) +
 646                                      (2 * sizeof(struct ulp_bde64)));
 647                         data_bde->addrHigh = putPaddrHigh(physaddr);
 648                         data_bde->addrLow = putPaddrLow(physaddr);
 649                         /* ebde count includes the responce bde and data bpl */
 650                         iocb_cmd->unsli3.fcp_ext.ebde_count = 2;
 651                 } else {
 652                         /* ebde count includes the responce bde and data bdes */
 653                         iocb_cmd->unsli3.fcp_ext.ebde_count = (num_bde + 1);
 654                 }
 655         } else {
 656                 iocb_cmd->un.fcpi64.bdl.bdeSize =
 657                         ((num_bde + 2) * sizeof(struct ulp_bde64));
 658         }
 659         fcp_cmnd->fcpDl = cpu_to_be32(scsi_bufflen(scsi_cmnd));
 660         return 0;
 661 }
 662
 663 /**
 664  * lpfc_send_scsi_error_event: Posts an event when there is SCSI error.
 665  * @phba: Pointer to hba context object.
 666  * @vport: Pointer to vport object.
 667  * @lpfc_cmd: Pointer to lpfc scsi command which reported the error.
 668  * @rsp_iocb: Pointer to response iocb object which reported error.
 669  *
 670  * This function posts an event when there is a SCSI command reporting
 671  * error from the scsi device.
 672  **/
 673 static void
 674 lpfc_send_scsi_error_event(struct lpfc_hba *phba, struct lpfc_vport *vport,
 675                 struct lpfc_scsi_buf *lpfc_cmd, struct lpfc_iocbq *rsp_iocb) {
 676         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 677         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 678         uint32_t resp_info = fcprsp->rspStatus2;
 679         uint32_t scsi_status = fcprsp->rspStatus3;
 680         uint32_t fcpi_parm = rsp_iocb->iocb.un.fcpi.fcpi_parm;
 681         struct lpfc_fast_path_event *fast_path_evt = NULL;
 682         struct lpfc_nodelist *pnode = lpfc_cmd->rdata->pnode;
 683         unsigned long flags;
 684
 685         /* If there is queuefull or busy condition send a scsi event */
 686         if ((cmnd->result == SAM_STAT_TASK_SET_FULL) ||
 687                 (cmnd->result == SAM_STAT_BUSY)) {
 688                 fast_path_evt = lpfc_alloc_fast_evt(phba);
 689                 if (!fast_path_evt)
 690                         return;
 691                 fast_path_evt->un.scsi_evt.event_type =
 692                         FC_REG_SCSI_EVENT;
 693                 fast_path_evt->un.scsi_evt.subcategory =
 694                 (cmnd->result == SAM_STAT_TASK_SET_FULL) ?
 695                 LPFC_EVENT_QFULL : LPFC_EVENT_DEVBSY;
 696                 fast_path_evt->un.scsi_evt.lun = cmnd->device->lun;
 697                 memcpy(&fast_path_evt->un.scsi_evt.wwpn,
 698                         &pnode->nlp_portname, sizeof(struct lpfc_name));
 699                 memcpy(&fast_path_evt->un.scsi_evt.wwnn,
 700                         &pnode->nlp_nodename, sizeof(struct lpfc_name));
 701         } else if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen &&
 702                 ((cmnd->cmnd[0] == READ_10) || (cmnd->cmnd[0] == WRITE_10))) {
 703                 fast_path_evt = lpfc_alloc_fast_evt(phba);
 704                 if (!fast_path_evt)
 705                         return;
 706                 fast_path_evt->un.check_cond_evt.scsi_event.event_type =
 707                         FC_REG_SCSI_EVENT;
 708                 fast_path_evt->un.check_cond_evt.scsi_event.subcategory =
 709                         LPFC_EVENT_CHECK_COND;
 710                 fast_path_evt->un.check_cond_evt.scsi_event.lun =
 711                         cmnd->device->lun;
 712                 memcpy(&fast_path_evt->un.check_cond_evt.scsi_event.wwpn,
 713                         &pnode->nlp_portname, sizeof(struct lpfc_name));
 714                 memcpy(&fast_path_evt->un.check_cond_evt.scsi_event.wwnn,
 715                         &pnode->nlp_nodename, sizeof(struct lpfc_name));
 716                 fast_path_evt->un.check_cond_evt.sense_key =
 717                         cmnd->sense_buffer[2] & 0xf;
 718                 fast_path_evt->un.check_cond_evt.asc = cmnd->sense_buffer[12];
 719                 fast_path_evt->un.check_cond_evt.ascq = cmnd->sense_buffer[13];
 720         } else if ((cmnd->sc_data_direction == DMA_FROM_DEVICE) &&
 721                      fcpi_parm &&
 722                      ((be32_to_cpu(fcprsp->rspResId) != fcpi_parm) ||
 723                         ((scsi_status == SAM_STAT_GOOD) &&
 724                         !(resp_info & (RESID_UNDER | RESID_OVER))))) {
 725                 /*
 726                  * If status is good or resid does not match with fcp_param and
 727                  * there is valid fcpi_parm, then there is a read_check error
 728                  */
 729                 fast_path_evt = lpfc_alloc_fast_evt(phba);
 730                 if (!fast_path_evt)
 731                         return;
 732                 fast_path_evt->un.read_check_error.header.event_type =
 733                         FC_REG_FABRIC_EVENT;
 734                 fast_path_evt->un.read_check_error.header.subcategory =
 735                         LPFC_EVENT_FCPRDCHKERR;
 736                 memcpy(&fast_path_evt->un.read_check_error.header.wwpn,
 737                         &pnode->nlp_portname, sizeof(struct lpfc_name));
 738                 memcpy(&fast_path_evt->un.read_check_error.header.wwnn,
 739                         &pnode->nlp_nodename, sizeof(struct lpfc_name));
 740                 fast_path_evt->un.read_check_error.lun = cmnd->device->lun;
 741                 fast_path_evt->un.read_check_error.opcode = cmnd->cmnd[0];
 742                 fast_path_evt->un.read_check_error.fcpiparam =
 743                         fcpi_parm;
 744         } else
 745                 return;
 746
 747         fast_path_evt->vport = vport;
 748         spin_lock_irqsave(&phba->hbalock, flags);
 749         list_add_tail(&fast_path_evt->work_evt.evt_listp, &phba->work_list);
 750         spin_unlock_irqrestore(&phba->hbalock, flags);
 751         lpfc_worker_wake_up(phba);
 752         return;
 753 }
 754
 755 /**
 756  * lpfc_scsi_unprep_dma_buf: Routine to un-map DMA mapping of scatter gather.
 757  * @phba: The Hba for which this call is being executed.
 758  * @psb: The scsi buffer which is going to be un-mapped.
 759  *
 760  * This routine does DMA un-mapping of scatter gather list of scsi command
 761  * field of @lpfc_cmd.
 762  **/
 763 static void
 764 lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
 765 {
 766         /*
 767          * There are only two special cases to consider.  (1) the scsi command
 768          * requested scatter-gather usage or (2) the scsi command allocated
 769          * a request buffer, but did not request use_sg.  There is a third
 770          * case, but it does not require resource deallocation.
 771          */
 772         if (psb->seg_cnt > 0)
 773                 scsi_dma_unmap(psb->pCmd);
 774 }
 775
 776 /**
 777  * lpfc_handler_fcp_err: FCP response handler.
 778  * @vport: The virtual port for which this call is being executed.
 779  * @lpfc_cmd: Pointer to lpfc_scsi_buf data structure.
 780  * @rsp_iocb: The response IOCB which contains FCP error.
 781  *
 782  * This routine is called to process response IOCB with status field
 783  * IOSTAT_FCP_RSP_ERROR. This routine sets result field of scsi command
 784  * based upon SCSI and FCP error.
 785  **/
 786 static void
 787 lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
 788                     struct lpfc_iocbq *rsp_iocb)
 789 {
 790         struct scsi_cmnd *cmnd = lpfc_cmd->pCmd;
 791         struct fcp_cmnd *fcpcmd = lpfc_cmd->fcp_cmnd;
 792         struct fcp_rsp *fcprsp = lpfc_cmd->fcp_rsp;
 793         uint32_t fcpi_parm = rsp_iocb->iocb.un.fcpi.fcpi_parm;
 794         uint32_t resp_info = fcprsp->rspStatus2;
 795         uint32_t scsi_status = fcprsp->rspStatus3;
 796         uint32_t *lp;
 797         uint32_t host_status = DID_OK;
 798         uint32_t rsplen = 0;
 799         uint32_t logit = LOG_FCP | LOG_FCP_ERROR;
 800
 801
 802         /*
 803          *  If this is a task management command, there is no
 804          *  scsi packet associated with this lpfc_cmd.  The driver
 805          *  consumes it.
 806          */
 807         if (fcpcmd->fcpCntl2) {
 808                 scsi_status = 0;
 809                 goto out;
 810         }
 811
 812         if ((resp_info & SNS_LEN_VALID) && fcprsp->rspSnsLen) {
 813                 uint32_t snslen = be32_to_cpu(fcprsp->rspSnsLen);
 814                 if (snslen > SCSI_SENSE_BUFFERSIZE)
 815                         snslen = SCSI_SENSE_BUFFERSIZE;
 816
 817                 if (resp_info & RSP_LEN_VALID)
 818                   rsplen = be32_to_cpu(fcprsp->rspRspLen);
 819                 memcpy(cmnd->sense_buffer, &fcprsp->rspInfo0 + rsplen, snslen);
 820         }
 821         lp = (uint32_t *)cmnd->sense_buffer;
 822
 823         if (!scsi_status && (resp_info & RESID_UNDER))
 824                 logit = LOG_FCP;
 825
 826         lpfc_printf_vlog(vport, KERN_WARNING, logit,
 827                          "0730 FCP command x%x failed: x%x SNS x%x x%x "
 828                          "Data: x%x x%x x%x x%x x%x\n",
 829                          cmnd->cmnd[0], scsi_status,
 830                          be32_to_cpu(*lp), be32_to_cpu(*(lp + 3)), resp_info,
 831                          be32_to_cpu(fcprsp->rspResId),
 832                          be32_to_cpu(fcprsp->rspSnsLen),
 833                          be32_to_cpu(fcprsp->rspRspLen),
 834                          fcprsp->rspInfo3);
 835
 836         if (resp_info & RSP_LEN_VALID) {
 837                 rsplen = be32_to_cpu(fcprsp->rspRspLen);
 838                 if ((rsplen != 0 && rsplen != 4 && rsplen != 8) ||
 839                     (fcprsp->rspInfo3 != RSP_NO_FAILURE)) {
 840                         host_status = DID_ERROR;
 841                         goto out;
 842                 }
 843         }
 844
 845         scsi_set_resid(cmnd, 0);
 846         if (resp_info & RESID_UNDER) {
 847                 scsi_set_resid(cmnd, be32_to_cpu(fcprsp->rspResId));
 848
 849                 lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
 850                                  "0716 FCP Read Underrun, expected %d, "
 851                                  "residual %d Data: x%x x%x x%x\n",
 852                                  be32_to_cpu(fcpcmd->fcpDl),
 853                                  scsi_get_resid(cmnd), fcpi_parm, cmnd->cmnd[0],
 854                                  cmnd->underflow);
 855
 856                 /*
 857                  * If there is an under run check if under run reported by
 858                  * storage array is same as the under run reported by HBA.
 859                  * If this is not same, there is a dropped frame.
 860                  */
 861                 if ((cmnd->sc_data_direction == DMA_FROM_DEVICE) &&
 862                         fcpi_parm &&
 863                         (scsi_get_resid(cmnd) != fcpi_parm)) {
 864                         lpfc_printf_vlog(vport, KERN_WARNING,
 865                                          LOG_FCP | LOG_FCP_ERROR,
 866                                          "0735 FCP Read Check Error "
 867                                          "and Underrun Data: x%x x%x x%x x%x\n",
 868                                          be32_to_cpu(fcpcmd->fcpDl),
 869                                          scsi_get_resid(cmnd), fcpi_parm,
 870                                          cmnd->cmnd[0]);
 871                         scsi_set_resid(cmnd, scsi_bufflen(cmnd));
 872                         host_status = DID_ERROR;
 873                 }
 874                 /*
 875                  * The cmnd->underflow is the minimum number of bytes that must
 876                  * be transfered for this command.  Provided a sense condition
 877                  * is not present, make sure the actual amount transferred is at
 878                  * least the underflow value or fail.
 879                  */
 880                 if (!(resp_info & SNS_LEN_VALID) &&
 881                     (scsi_status == SAM_STAT_GOOD) &&
 882                     (scsi_bufflen(cmnd) - scsi_get_resid(cmnd)
 883                      < cmnd->underflow)) {
 884                         lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
 885                                          "0717 FCP command x%x residual "
 886                                          "underrun converted to error "
 887                                          "Data: x%x x%x x%x\n",
 888                                          cmnd->cmnd[0], scsi_bufflen(cmnd),
 889                                          scsi_get_resid(cmnd), cmnd->underflow);
 890                         host_status = DID_ERROR;
 891                 }
 892         } else if (resp_info & RESID_OVER) {
 893                 lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
 894                                  "0720 FCP command x%x residual overrun error. "
 895                                  "Data: x%x x%x \n", cmnd->cmnd[0],
 896                                  scsi_bufflen(cmnd), scsi_get_resid(cmnd));
 897                 host_status = DID_ERROR;
 898
 899         /*
 900          * Check SLI validation that all the transfer was actually done
 901          * (fcpi_parm should be zero). Apply check only to reads.
 902          */
 903         } else if ((scsi_status == SAM_STAT_GOOD) && fcpi_parm &&
 904                         (cmnd->sc_data_direction == DMA_FROM_DEVICE)) {
 905                 lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP | LOG_FCP_ERROR,
 906                                  "0734 FCP Read Check Error Data: "
 907                                  "x%x x%x x%x x%x\n",
 908                                  be32_to_cpu(fcpcmd->fcpDl),
 909                                  be32_to_cpu(fcprsp->rspResId),
 910                                  fcpi_parm, cmnd->cmnd[0]);
 911                 host_status = DID_ERROR;
 912                 scsi_set_resid(cmnd, scsi_bufflen(cmnd));
 913         }
 914
 915  out:
 916         cmnd->result = ScsiResult(host_status, scsi_status);
 917         lpfc_send_scsi_error_event(vport->phba, vport, lpfc_cmd, rsp_iocb);
 918 }
 919
 920 /**
 921  * lpfc_scsi_cmd_iocb_cmpl: Scsi cmnd IOCB completion routine.
 922  * @phba: The Hba for which this call is being executed.
 923  * @pIocbIn: The command IOCBQ for the scsi cmnd.
 924  * @pIocbOut: The response IOCBQ for the scsi cmnd .
 925  *
 926  * This routine assigns scsi command result by looking into response IOCB
 927  * status field appropriately. This routine handles QUEUE FULL condition as
 928  * well by ramping down device queue depth.
 929  **/
 930 static void
 931 lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
 932                         struct lpfc_iocbq *pIocbOut)
 933 {
 934         struct lpfc_scsi_buf *lpfc_cmd =
 935                 (struct lpfc_scsi_buf *) pIocbIn->context1;
 936         struct lpfc_vport      *vport = pIocbIn->vport;
 937         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
 938         struct lpfc_nodelist *pnode = rdata->pnode;
 939         struct scsi_cmnd *cmd = lpfc_cmd->pCmd;
 940         int result;
 941         struct scsi_device *sdev, *tmp_sdev;
 942         int depth = 0;
 943         unsigned long flags;
 944         struct lpfc_fast_path_event *fast_path_evt;
 945
 946         lpfc_cmd->result = pIocbOut->iocb.un.ulpWord[4];
 947         lpfc_cmd->status = pIocbOut->iocb.ulpStatus;
 948         if (pnode && NLP_CHK_NODE_ACT(pnode))
 949                 atomic_dec(&pnode->cmd_pending);
 950
 951         if (lpfc_cmd->status) {
 952                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
 953                     (lpfc_cmd->result & IOERR_DRVR_MASK))
 954                         lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
 955                 else if (lpfc_cmd->status >= IOSTAT_CNT)
 956                         lpfc_cmd->status = IOSTAT_DEFAULT;
 957
 958                 lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
 959                                  "0729 FCP cmd x%x failed <%d/%d> "
 960                                  "status: x%x result: x%x Data: x%x x%x\n",
 961                                  cmd->cmnd[0],
 962                                  cmd->device ? cmd->device->id : 0xffff,
 963                                  cmd->device ? cmd->device->lun : 0xffff,
 964                                  lpfc_cmd->status, lpfc_cmd->result,
 965                                  pIocbOut->iocb.ulpContext,
 966                                  lpfc_cmd->cur_iocbq.iocb.ulpIoTag);
 967
 968                 switch (lpfc_cmd->status) {
 969                 case IOSTAT_FCP_RSP_ERROR:
 970                         /* Call FCP RSP handler to determine result */
 971                         lpfc_handle_fcp_err(vport, lpfc_cmd, pIocbOut);
 972                         break;
 973                 case IOSTAT_NPORT_BSY:
 974                 case IOSTAT_FABRIC_BSY:
 975                         cmd->result = ScsiResult(DID_TRANSPORT_DISRUPTED, 0);
 976                         fast_path_evt = lpfc_alloc_fast_evt(phba);
 977                         if (!fast_path_evt)
 978                                 break;
 979                         fast_path_evt->un.fabric_evt.event_type =
 980                                 FC_REG_FABRIC_EVENT;
 981                         fast_path_evt->un.fabric_evt.subcategory =
 982                                 (lpfc_cmd->status == IOSTAT_NPORT_BSY) ?
 983                                 LPFC_EVENT_PORT_BUSY : LPFC_EVENT_FABRIC_BUSY;
 984                         if (pnode && NLP_CHK_NODE_ACT(pnode)) {
 985                                 memcpy(&fast_path_evt->un.fabric_evt.wwpn,
 986                                         &pnode->nlp_portname,
 987                                         sizeof(struct lpfc_name));
 988                                 memcpy(&fast_path_evt->un.fabric_evt.wwnn,
 989                                         &pnode->nlp_nodename,
 990                                         sizeof(struct lpfc_name));
 991                         }
 992                         fast_path_evt->vport = vport;
 993                         fast_path_evt->work_evt.evt =
 994                                 LPFC_EVT_FASTPATH_MGMT_EVT;
 995                         spin_lock_irqsave(&phba->hbalock, flags);
 996                         list_add_tail(&fast_path_evt->work_evt.evt_listp,
 997                                 &phba->work_list);
 998                         spin_unlock_irqrestore(&phba->hbalock, flags);
 999                         lpfc_worker_wake_up(phba);
1000                         break;
1001                 case IOSTAT_LOCAL_REJECT:
1002                         if (lpfc_cmd->result == IOERR_INVALID_RPI ||
1003                             lpfc_cmd->result == IOERR_NO_RESOURCES ||
1004                             lpfc_cmd->result == IOERR_ABORT_REQUESTED) {
1005                                 cmd->result = ScsiResult(DID_REQUEUE, 0);
1006                                 break;
1007                         } /* else: fall through */
1008                 default:
1009                         cmd->result = ScsiResult(DID_ERROR, 0);
1010                         break;
1011                 }
1012
1013                 if (!pnode || !NLP_CHK_NODE_ACT(pnode)
1014                     || (pnode->nlp_state != NLP_STE_MAPPED_NODE))
1015                         cmd->result = ScsiResult(DID_TRANSPORT_DISRUPTED,
1016                                                  SAM_STAT_BUSY);
1017         } else {
1018                 cmd->result = ScsiResult(DID_OK, 0);
1019         }
1020
1021         if (cmd->result || lpfc_cmd->fcp_rsp->rspSnsLen) {
1022                 uint32_t *lp = (uint32_t *)cmd->sense_buffer;
1023
1024                 lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
1025                                  "0710 Iodone <%d/%d> cmd %p, error "
1026                                  "x%x SNS x%x x%x Data: x%x x%x\n",
1027                                  cmd->device->id, cmd->device->lun, cmd,
1028                                  cmd->result, *lp, *(lp + 3), cmd->retries,
1029                                  scsi_get_resid(cmd));
1030         }
1031
1032         lpfc_update_stats(phba, lpfc_cmd);
1033         result = cmd->result;
1034         sdev = cmd->device;
1035         if (vport->cfg_max_scsicmpl_time &&
1036            time_after(jiffies, lpfc_cmd->start_time +
1037                 msecs_to_jiffies(vport->cfg_max_scsicmpl_time))) {
1038                 spin_lock_irqsave(sdev->host->host_lock, flags);
1039                 if (pnode && NLP_CHK_NODE_ACT(pnode)) {
1040                         if (pnode->cmd_qdepth >
1041                                 atomic_read(&pnode->cmd_pending) &&
1042                                 (atomic_read(&pnode->cmd_pending) >
1043                                 LPFC_MIN_TGT_QDEPTH) &&
1044                                 ((cmd->cmnd[0] == READ_10) ||
1045                                 (cmd->cmnd[0] == WRITE_10)))
1046                                 pnode->cmd_qdepth =
1047                                         atomic_read(&pnode->cmd_pending);
1048
1049                         pnode->last_change_time = jiffies;
1050                 }
1051                 spin_unlock_irqrestore(sdev->host->host_lock, flags);
1052         } else if (pnode && NLP_CHK_NODE_ACT(pnode)) {
1053                 if ((pnode->cmd_qdepth < LPFC_MAX_TGT_QDEPTH) &&
1054                    time_after(jiffies, pnode->last_change_time +
1055                               msecs_to_jiffies(LPFC_TGTQ_INTERVAL))) {
1056                         spin_lock_irqsave(sdev->host->host_lock, flags);
1057                         pnode->cmd_qdepth += pnode->cmd_qdepth *
1058                                 LPFC_TGTQ_RAMPUP_PCENT / 100;
1059                         if (pnode->cmd_qdepth > LPFC_MAX_TGT_QDEPTH)
1060                                 pnode->cmd_qdepth = LPFC_MAX_TGT_QDEPTH;
1061                         pnode->last_change_time = jiffies;
1062                         spin_unlock_irqrestore(sdev->host->host_lock, flags);
1063                 }
1064         }
1065
1066         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
1067         cmd->scsi_done(cmd);
1068
1069         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1070                 /*
1071                  * If there is a thread waiting for command completion
1072                  * wake up the thread.
1073                  */
1074                 spin_lock_irqsave(sdev->host->host_lock, flags);
1075                 lpfc_cmd->pCmd = NULL;
1076                 if (lpfc_cmd->waitq)
1077                         wake_up(lpfc_cmd->waitq);
1078                 spin_unlock_irqrestore(sdev->host->host_lock, flags);
1079                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1080                 return;
1081         }
1082
1083
1084         if (!result)
1085                 lpfc_rampup_queue_depth(vport, sdev);
1086
1087         if (!result && pnode && NLP_CHK_NODE_ACT(pnode) &&
1088            ((jiffies - pnode->last_ramp_up_time) >
1089                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
1090            ((jiffies - pnode->last_q_full_time) >
1091                 LPFC_Q_RAMP_UP_INTERVAL * HZ) &&
1092            (vport->cfg_lun_queue_depth > sdev->queue_depth)) {
1093                 shost_for_each_device(tmp_sdev, sdev->host) {
1094                         if (vport->cfg_lun_queue_depth > tmp_sdev->queue_depth){
1095                                 if (tmp_sdev->id != sdev->id)
1096                                         continue;
1097                                 if (tmp_sdev->ordered_tags)
1098                                         scsi_adjust_queue_depth(tmp_sdev,
1099                                                 MSG_ORDERED_TAG,
1100                                                 tmp_sdev->queue_depth+1);
1101                                 else
1102                                         scsi_adjust_queue_depth(tmp_sdev,
1103                                                 MSG_SIMPLE_TAG,
1104                                                 tmp_sdev->queue_depth+1);
1105
1106                                 pnode->last_ramp_up_time = jiffies;
1107                         }
1108                 }
1109                 lpfc_send_sdev_queuedepth_change_event(phba, vport, pnode,
1110                         0xFFFFFFFF,
1111                         sdev->queue_depth - 1, sdev->queue_depth);
1112         }
1113
1114         /*
1115          * Check for queue full.  If the lun is reporting queue full, then
1116          * back off the lun queue depth to prevent target overloads.
1117          */
1118         if (result == SAM_STAT_TASK_SET_FULL && pnode &&
1119             NLP_CHK_NODE_ACT(pnode)) {
1120                 pnode->last_q_full_time = jiffies;
1121
1122                 shost_for_each_device(tmp_sdev, sdev->host) {
1123                         if (tmp_sdev->id != sdev->id)
1124                                 continue;
1125                         depth = scsi_track_queue_full(tmp_sdev,
1126                                         tmp_sdev->queue_depth - 1);
1127                 }
1128                 /*
1129                  * The queue depth cannot be lowered any more.
1130                  * Modify the returned error code to store
1131                  * the final depth value set by
1132                  * scsi_track_queue_full.
1133                  */
1134                 if (depth == -1)
1135                         depth = sdev->host->cmd_per_lun;
1136
1137                 if (depth) {
1138                         lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
1139                                          "0711 detected queue full - lun queue "
1140                                          "depth adjusted to %d.\n", depth);
1141                         lpfc_send_sdev_queuedepth_change_event(phba, vport,
1142                                 pnode, 0xFFFFFFFF,
1143                                 depth+1, depth);
1144                 }
1145         }
1146
1147         /*
1148          * If there is a thread waiting for command completion
1149          * wake up the thread.
1150          */
1151         spin_lock_irqsave(sdev->host->host_lock, flags);
1152         lpfc_cmd->pCmd = NULL;
1153         if (lpfc_cmd->waitq)
1154                 wake_up(lpfc_cmd->waitq);
1155         spin_unlock_irqrestore(sdev->host->host_lock, flags);
1156
1157         lpfc_release_scsi_buf(phba, lpfc_cmd);
1158 }
1159
1160 /**
1161  * lpfc_fcpcmd_to_iocb - copy the fcp_cmd data into the IOCB.
1162  * @data: A pointer to the immediate command data portion of the IOCB.
1163  * @fcp_cmnd: The FCP Command that is provided by the SCSI layer.
1164  *
1165  * The routine copies the entire FCP command from @fcp_cmnd to @data while
1166  * byte swapping the data to big endian format for transmission on the wire.
1167  **/
1168 static void
1169 lpfc_fcpcmd_to_iocb(uint8_t *data, struct fcp_cmnd *fcp_cmnd)
1170 {
1171         int i, j;
1172         for (i = 0, j = 0; i < sizeof(struct fcp_cmnd);
1173              i += sizeof(uint32_t), j++) {
1174                 ((uint32_t *)data)[j] = cpu_to_be32(((uint32_t *)fcp_cmnd)[j]);
1175         }
1176 }
1177
1178 /**
1179  * lpfc_scsi_prep_cmnd:  Routine to convert scsi cmnd to FCP information unit.
1180  * @vport: The virtual port for which this call is being executed.
1181  * @lpfc_cmd: The scsi command which needs to send.
1182  * @pnode: Pointer to lpfc_nodelist.
1183  *
1184  * This routine initializes fcp_cmnd and iocb data structure from scsi command
1185  * to transfer.
1186  **/
1187 static void
1188 lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
1189                     struct lpfc_nodelist *pnode)
1190 {
1191         struct lpfc_hba *phba = vport->phba;
1192         struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
1193         struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
1194         IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
1195         struct lpfc_iocbq *piocbq = &(lpfc_cmd->cur_iocbq);
1196         int datadir = scsi_cmnd->sc_data_direction;
1197         char tag[2];
1198
1199         if (!pnode || !NLP_CHK_NODE_ACT(pnode))
1200                 return;
1201
1202         lpfc_cmd->fcp_rsp->rspSnsLen = 0;
1203         /* clear task management bits */
1204         lpfc_cmd->fcp_cmnd->fcpCntl2 = 0;
1205
1206         int_to_scsilun(lpfc_cmd->pCmd->device->lun,
1207                         &lpfc_cmd->fcp_cmnd->fcp_lun);
1208
1209         memcpy(&fcp_cmnd->fcpCdb[0], scsi_cmnd->cmnd, 16);
1210
1211         if (scsi_populate_tag_msg(scsi_cmnd, tag)) {
1212                 switch (tag[0]) {
1213                 case HEAD_OF_QUEUE_TAG:
1214                         fcp_cmnd->fcpCntl1 = HEAD_OF_Q;
1215                         break;
1216                 case ORDERED_QUEUE_TAG:
1217                         fcp_cmnd->fcpCntl1 = ORDERED_Q;
1218                         break;
1219                 default:
1220                         fcp_cmnd->fcpCntl1 = SIMPLE_Q;
1221                         break;
1222                 }
1223         } else
1224                 fcp_cmnd->fcpCntl1 = 0;
1225
1226         /*
1227          * There are three possibilities here - use scatter-gather segment, use
1228          * the single mapping, or neither.  Start the lpfc command prep by
1229          * bumping the bpl beyond the fcp_cmnd and fcp_rsp regions to the first
1230          * data bde entry.
1231          */
1232         if (scsi_sg_count(scsi_cmnd)) {
1233                 if (datadir == DMA_TO_DEVICE) {
1234                         iocb_cmd->ulpCommand = CMD_FCP_IWRITE64_CR;
1235                         iocb_cmd->un.fcpi.fcpi_parm = 0;
1236                         iocb_cmd->ulpPU = 0;
1237                         fcp_cmnd->fcpCntl3 = WRITE_DATA;
1238                         phba->fc4OutputRequests++;
1239                 } else {
1240                         iocb_cmd->ulpCommand = CMD_FCP_IREAD64_CR;
1241                         iocb_cmd->ulpPU = PARM_READ_CHECK;
1242                         iocb_cmd->un.fcpi.fcpi_parm = scsi_bufflen(scsi_cmnd);
1243                         fcp_cmnd->fcpCntl3 = READ_DATA;
1244                         phba->fc4InputRequests++;
1245                 }
1246         } else {
1247                 iocb_cmd->ulpCommand = CMD_FCP_ICMND64_CR;
1248                 iocb_cmd->un.fcpi.fcpi_parm = 0;
1249                 iocb_cmd->ulpPU = 0;
1250                 fcp_cmnd->fcpCntl3 = 0;
1251                 phba->fc4ControlRequests++;
1252         }
1253         if (phba->sli_rev == 3)
1254                 lpfc_fcpcmd_to_iocb(iocb_cmd->unsli3.fcp_ext.icd, fcp_cmnd);
1255         /*
1256          * Finish initializing those IOCB fields that are independent
1257          * of the scsi_cmnd request_buffer
1258          */
1259         piocbq->iocb.ulpContext = pnode->nlp_rpi;
1260         if (pnode->nlp_fcp_info & NLP_FCP_2_DEVICE)
1261                 piocbq->iocb.ulpFCP2Rcvy = 1;
1262         else
1263                 piocbq->iocb.ulpFCP2Rcvy = 0;
1264
1265         piocbq->iocb.ulpClass = (pnode->nlp_fcp_info & 0x0f);
1266         piocbq->context1  = lpfc_cmd;
1267         piocbq->iocb_cmpl = lpfc_scsi_cmd_iocb_cmpl;
1268         piocbq->iocb.ulpTimeout = lpfc_cmd->timeout;
1269         piocbq->vport = vport;
1270 }
1271
1272 /**
1273  * lpfc_scsi_prep_task_mgmt_cmnd: Convert scsi TM cmnd to FCP information unit.
1274  * @vport: The virtual port for which this call is being executed.
1275  * @lpfc_cmd: Pointer to lpfc_scsi_buf data structure.
1276  * @lun: Logical unit number.
1277  * @task_mgmt_cmd: SCSI task management command.
1278  *
1279  * This routine creates FCP information unit corresponding to @task_mgmt_cmd.
1280  *
1281  * Return codes:
1282  *   0 - Error
1283  *   1 - Success
1284  **/
1285 static int
1286 lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_vport *vport,
1287                              struct lpfc_scsi_buf *lpfc_cmd,
1288                              unsigned int lun,
1289                              uint8_t task_mgmt_cmd)
1290 {
1291         struct lpfc_iocbq *piocbq;
1292         IOCB_t *piocb;
1293         struct fcp_cmnd *fcp_cmnd;
1294         struct lpfc_rport_data *rdata = lpfc_cmd->rdata;
1295         struct lpfc_nodelist *ndlp = rdata->pnode;
1296
1297         if (!ndlp || !NLP_CHK_NODE_ACT(ndlp) ||
1298             ndlp->nlp_state != NLP_STE_MAPPED_NODE)
1299                 return 0;
1300
1301         piocbq = &(lpfc_cmd->cur_iocbq);
1302         piocbq->vport = vport;
1303
1304         piocb = &piocbq->iocb;
1305
1306         fcp_cmnd = lpfc_cmd->fcp_cmnd;
1307         /* Clear out any old data in the FCP command area */
1308         memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1309         int_to_scsilun(lun, &fcp_cmnd->fcp_lun);
1310         fcp_cmnd->fcpCntl2 = task_mgmt_cmd;
1311         if (vport->phba->sli_rev == 3)
1312                 lpfc_fcpcmd_to_iocb(piocb->unsli3.fcp_ext.icd, fcp_cmnd);
1313         piocb->ulpCommand = CMD_FCP_ICMND64_CR;
1314         piocb->ulpContext = ndlp->nlp_rpi;
1315         if (ndlp->nlp_fcp_info & NLP_FCP_2_DEVICE) {
1316                 piocb->ulpFCP2Rcvy = 1;
1317         }
1318         piocb->ulpClass = (ndlp->nlp_fcp_info & 0x0f);
1319
1320         /* ulpTimeout is only one byte */
1321         if (lpfc_cmd->timeout > 0xff) {
1322                 /*
1323                  * Do not timeout the command at the firmware level.
1324                  * The driver will provide the timeout mechanism.
1325                  */
1326                 piocb->ulpTimeout = 0;
1327         } else {
1328                 piocb->ulpTimeout = lpfc_cmd->timeout;
1329         }
1330
1331         return 1;
1332 }
1333
1334 /**
1335  * lpc_taskmgmt_def_cmpl: IOCB completion routine for task management command.
1336  * @phba: The Hba for which this call is being executed.
1337  * @cmdiocbq: Pointer to lpfc_iocbq data structure.
1338  * @rspiocbq: Pointer to lpfc_iocbq data structure.
1339  *
1340  * This routine is IOCB completion routine for device reset and target reset
1341  * routine. This routine release scsi buffer associated with lpfc_cmd.
1342  **/
1343 static void
1344 lpfc_tskmgmt_def_cmpl(struct lpfc_hba *phba,
1345                         struct lpfc_iocbq *cmdiocbq,
1346                         struct lpfc_iocbq *rspiocbq)
1347 {
1348         struct lpfc_scsi_buf *lpfc_cmd =
1349                 (struct lpfc_scsi_buf *) cmdiocbq->context1;
1350         if (lpfc_cmd)
1351                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1352         return;
1353 }
1354
1355 /**
1356  * lpfc_scsi_tgt_reset: Target reset handler.
1357  * @lpfc_cmd: Pointer to lpfc_scsi_buf data structure
1358  * @vport: The virtual port for which this call is being executed.
1359  * @tgt_id: Target ID.
1360  * @lun: Lun number.
1361  * @rdata: Pointer to lpfc_rport_data.
1362  *
1363  * This routine issues a TARGET RESET iocb to reset a target with @tgt_id ID.
1364  *
1365  * Return Code:
1366  *   0x2003 - Error
1367  *   0x2002 - Success.
1368  **/
1369 static int
1370 lpfc_scsi_tgt_reset(struct lpfc_scsi_buf *lpfc_cmd, struct lpfc_vport *vport,
1371                     unsigned  tgt_id, unsigned int lun,
1372                     struct lpfc_rport_data *rdata)
1373 {
1374         struct lpfc_hba   *phba = vport->phba;
1375         struct lpfc_iocbq *iocbq;
1376         struct lpfc_iocbq *iocbqrsp;
1377         int ret;
1378         int status;
1379
1380         if (!rdata->pnode || !NLP_CHK_NODE_ACT(rdata->pnode))
1381                 return FAILED;
1382
1383         lpfc_cmd->rdata = rdata;
1384         status = lpfc_scsi_prep_task_mgmt_cmd(vport, lpfc_cmd, lun,
1385                                            FCP_TARGET_RESET);
1386         if (!status)
1387                 return FAILED;
1388
1389         iocbq = &lpfc_cmd->cur_iocbq;
1390         iocbqrsp = lpfc_sli_get_iocbq(phba);
1391
1392         if (!iocbqrsp)
1393                 return FAILED;
1394
1395         /* Issue Target Reset to TGT <num> */
1396         lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
1397                          "0702 Issue Target Reset to TGT %d Data: x%x x%x\n",
1398                          tgt_id, rdata->pnode->nlp_rpi, rdata->pnode->nlp_flag);
1399         status = lpfc_sli_issue_iocb_wait(phba,
1400                                        &phba->sli.ring[phba->sli.fcp_ring],
1401                                        iocbq, iocbqrsp, lpfc_cmd->timeout);
1402         if (status != IOCB_SUCCESS) {
1403                 if (status == IOCB_TIMEDOUT) {
1404                         iocbq->iocb_cmpl = lpfc_tskmgmt_def_cmpl;
1405                         ret = TIMEOUT_ERROR;
1406                 } else
1407                         ret = FAILED;
1408                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
1409         } else {
1410                 ret = SUCCESS;
1411                 lpfc_cmd->result = iocbqrsp->iocb.un.ulpWord[4];
1412                 lpfc_cmd->status = iocbqrsp->iocb.ulpStatus;
1413                 if (lpfc_cmd->status == IOSTAT_LOCAL_REJECT &&
1414                         (lpfc_cmd->result & IOERR_DRVR_MASK))
1415                                 lpfc_cmd->status = IOSTAT_DRIVER_REJECT;
1416         }
1417
1418         lpfc_sli_release_iocbq(phba, iocbqrsp);
1419         return ret;
1420 }
1421
1422 /**
1423  * lpfc_info: Info entry point of scsi_host_template data structure.
1424  * @host: The scsi host for which this call is being executed.
1425  *
1426  * This routine provides module information about hba.
1427  *
1428  * Reutrn code:
1429  *   Pointer to char - Success.
1430  **/
1431 const char *
1432 lpfc_info(struct Scsi_Host *host)
1433 {
1434         struct lpfc_vport *vport = (struct lpfc_vport *) host->hostdata;
1435         struct lpfc_hba   *phba = vport->phba;
1436         int len;
1437         static char  lpfcinfobuf[384];
1438
1439         memset(lpfcinfobuf,0,384);
1440         if (phba && phba->pcidev){
1441                 strncpy(lpfcinfobuf, phba->ModelDesc, 256);
1442                 len = strlen(lpfcinfobuf);
1443                 snprintf(lpfcinfobuf + len,
1444                         384-len,
1445                         " on PCI bus %02x device %02x irq %d",
1446                         phba->pcidev->bus->number,
1447                         phba->pcidev->devfn,
1448                         phba->pcidev->irq);
1449                 len = strlen(lpfcinfobuf);
1450                 if (phba->Port[0]) {
1451                         snprintf(lpfcinfobuf + len,
1452                                  384-len,
1453                                  " port %s",
1454                                  phba->Port);
1455                 }
1456         }
1457         return lpfcinfobuf;
1458 }
1459
1460 /**
1461  * lpfc_poll_rearm_time: Routine to modify fcp_poll timer of hba.
1462  * @phba: The Hba for which this call is being executed.
1463  *
1464  * This routine modifies fcp_poll_timer  field of @phba by cfg_poll_tmo.
1465  * The default value of cfg_poll_tmo is 10 milliseconds.
1466  **/
1467 static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
1468 {
1469         unsigned long  poll_tmo_expires =
1470                 (jiffies + msecs_to_jiffies(phba->cfg_poll_tmo));
1471
1472         if (phba->sli.ring[LPFC_FCP_RING].txcmplq_cnt)
1473                 mod_timer(&phba->fcp_poll_timer,
1474                           poll_tmo_expires);
1475 }
1476
1477 /**
1478  * lpfc_poll_start_timer: Routine to start fcp_poll_timer of HBA.
1479  * @phba: The Hba for which this call is being executed.
1480  *
1481  * This routine starts the fcp_poll_timer of @phba.
1482  **/
1483 void lpfc_poll_start_timer(struct lpfc_hba * phba)
1484 {
1485         lpfc_poll_rearm_timer(phba);
1486 }
1487
1488 /**
1489  * lpfc_poll_timeout: Restart polling timer.
1490  * @ptr: Map to lpfc_hba data structure pointer.
1491  *
1492  * This routine restarts fcp_poll timer, when FCP ring  polling is enable
1493  * and FCP Ring interrupt is disable.
1494  **/
1495
1496 void lpfc_poll_timeout(unsigned long ptr)
1497 {
1498         struct lpfc_hba *phba = (struct lpfc_hba *) ptr;
1499
1500         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1501                 lpfc_sli_poll_fcp_ring (phba);
1502                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1503                         lpfc_poll_rearm_timer(phba);
1504         }
1505 }
1506
1507 /**
1508  * lpfc_queuecommand: Queuecommand entry point of Scsi Host Templater data
1509  * structure.
1510  * @cmnd: Pointer to scsi_cmnd data structure.
1511  * @done: Pointer to done routine.
1512  *
1513  * Driver registers this routine to scsi midlayer to submit a @cmd to process.
1514  * This routine prepares an IOCB from scsi command and provides to firmware.
1515  * The @done callback is invoked after driver finished processing the command.
1516  *
1517  * Return value :
1518  *   0 - Success
1519  *   SCSI_MLQUEUE_HOST_BUSY - Block all devices served by this host temporarily.
1520  **/
1521 static int
1522 lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
1523 {
1524         struct Scsi_Host  *shost = cmnd->device->host;
1525         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
1526         struct lpfc_hba   *phba = vport->phba;
1527         struct lpfc_sli   *psli = &phba->sli;
1528         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
1529         struct lpfc_nodelist *ndlp = rdata->pnode;
1530         struct lpfc_scsi_buf *lpfc_cmd;
1531         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1532         int err;
1533
1534         err = fc_remote_port_chkready(rport);
1535         if (err) {
1536                 cmnd->result = err;
1537                 goto out_fail_command;
1538         }
1539
1540         /*
1541          * Catch race where our node has transitioned, but the
1542          * transport is still transitioning.
1543          */
1544         if (!ndlp || !NLP_CHK_NODE_ACT(ndlp)) {
1545                 cmnd->result = ScsiResult(DID_TRANSPORT_DISRUPTED, 0);
1546                 goto out_fail_command;
1547         }
1548         if (vport->cfg_max_scsicmpl_time &&
1549                 (atomic_read(&ndlp->cmd_pending) >= ndlp->cmd_qdepth))
1550                 goto out_host_busy;
1551
1552         lpfc_cmd = lpfc_get_scsi_buf(phba);
1553         if (lpfc_cmd == NULL) {
1554                 lpfc_rampdown_queue_depth(phba);
1555
1556                 lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
1557                                  "0707 driver's buffer pool is empty, "
1558                                  "IO busied\n");
1559                 goto out_host_busy;
1560         }
1561
1562         /*
1563          * Store the midlayer's command structure for the completion phase
1564          * and complete the command initialization.
1565          */
1566         lpfc_cmd->pCmd  = cmnd;
1567         lpfc_cmd->rdata = rdata;
1568         lpfc_cmd->timeout = 0;
1569         lpfc_cmd->start_time = jiffies;
1570         cmnd->host_scribble = (unsigned char *)lpfc_cmd;
1571         cmnd->scsi_done = done;
1572
1573         err = lpfc_scsi_prep_dma_buf(phba, lpfc_cmd);
1574         if (err)
1575                 goto out_host_busy_free_buf;
1576
1577         lpfc_scsi_prep_cmnd(vport, lpfc_cmd, ndlp);
1578
1579         atomic_inc(&ndlp->cmd_pending);
1580         err = lpfc_sli_issue_iocb(phba, &phba->sli.ring[psli->fcp_ring],
1581                                   &lpfc_cmd->cur_iocbq, SLI_IOCB_RET_IOCB);
1582         if (err) {
1583                 atomic_dec(&ndlp->cmd_pending);
1584                 goto out_host_busy_free_buf;
1585         }
1586         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
1587                 lpfc_sli_poll_fcp_ring(phba);
1588                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1589                         lpfc_poll_rearm_timer(phba);
1590         }
1591
1592         return 0;
1593
1594  out_host_busy_free_buf:
1595         lpfc_scsi_unprep_dma_buf(phba, lpfc_cmd);
1596         lpfc_release_scsi_buf(phba, lpfc_cmd);
1597  out_host_busy:
1598         return SCSI_MLQUEUE_HOST_BUSY;
1599
1600  out_fail_command:
1601         done(cmnd);
1602         return 0;
1603 }
1604
1605 /**
1606  * lpfc_block_error_handler: Routine to block error  handler.
1607  * @cmnd: Pointer to scsi_cmnd data structure.
1608  *
1609  *  This routine blocks execution till fc_rport state is not FC_PORSTAT_BLCOEKD.
1610  **/
1611 static void
1612 lpfc_block_error_handler(struct scsi_cmnd *cmnd)
1613 {
1614         struct Scsi_Host *shost = cmnd->device->host;
1615         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1616
1617         spin_lock_irq(shost->host_lock);
1618         while (rport->port_state == FC_PORTSTATE_BLOCKED) {
1619                 spin_unlock_irq(shost->host_lock);
1620                 msleep(1000);
1621                 spin_lock_irq(shost->host_lock);
1622         }
1623         spin_unlock_irq(shost->host_lock);
1624         return;
1625 }
1626
1627 /**
1628  * lpfc_abort_handler: Eh_abort_handler entry point of Scsi Host Template data
1629  *structure.
1630  * @cmnd: Pointer to scsi_cmnd data structure.
1631  *
1632  * This routine aborts @cmnd pending in base driver.
1633  *
1634  * Return code :
1635  *   0x2003 - Error
1636  *   0x2002 - Success
1637  **/
1638 static int
1639 lpfc_abort_handler(struct scsi_cmnd *cmnd)
1640 {
1641         struct Scsi_Host  *shost = cmnd->device->host;
1642         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
1643         struct lpfc_hba   *phba = vport->phba;
1644         struct lpfc_sli_ring *pring = &phba->sli.ring[phba->sli.fcp_ring];
1645         struct lpfc_iocbq *iocb;
1646         struct lpfc_iocbq *abtsiocb;
1647         struct lpfc_scsi_buf *lpfc_cmd;
1648         IOCB_t *cmd, *icmd;
1649         int ret = SUCCESS;
1650         DECLARE_WAIT_QUEUE_HEAD_ONSTACK(waitq);
1651
1652         lpfc_block_error_handler(cmnd);
1653         lpfc_cmd = (struct lpfc_scsi_buf *)cmnd->host_scribble;
1654         BUG_ON(!lpfc_cmd);
1655
1656         /*
1657          * If pCmd field of the corresponding lpfc_scsi_buf structure
1658          * points to a different SCSI command, then the driver has
1659          * already completed this command, but the midlayer did not
1660          * see the completion before the eh fired.  Just return
1661          * SUCCESS.
1662          */
1663         iocb = &lpfc_cmd->cur_iocbq;
1664         if (lpfc_cmd->pCmd != cmnd)
1665                 goto out;
1666
1667         BUG_ON(iocb->context1 != lpfc_cmd);
1668
1669         abtsiocb = lpfc_sli_get_iocbq(phba);
1670         if (abtsiocb == NULL) {
1671                 ret = FAILED;
1672                 goto out;
1673         }
1674
1675         /*
1676          * The scsi command can not be in txq and it is in flight because the
1677          * pCmd is still pointig at the SCSI command we have to abort. There
1678          * is no need to search the txcmplq. Just send an abort to the FW.
1679          */
1680
1681         cmd = &iocb->iocb;
1682         icmd = &abtsiocb->iocb;
1683         icmd->un.acxri.abortType = ABORT_TYPE_ABTS;
1684         icmd->un.acxri.abortContextTag = cmd->ulpContext;
1685         icmd->un.acxri.abortIoTag = cmd->ulpIoTag;
1686
1687         icmd->ulpLe = 1;
1688         icmd->ulpClass = cmd->ulpClass;
1689         if (lpfc_is_link_up(phba))
1690                 icmd->ulpCommand = CMD_ABORT_XRI_CN;
1691         else
1692                 icmd->ulpCommand = CMD_CLOSE_XRI_CN;
1693
1694         abtsiocb->iocb_cmpl = lpfc_sli_abort_fcp_cmpl;
1695         abtsiocb->vport = vport;
1696         if (lpfc_sli_issue_iocb(phba, pring, abtsiocb, 0) == IOCB_ERROR) {
1697                 lpfc_sli_release_iocbq(phba, abtsiocb);
1698                 ret = FAILED;
1699                 goto out;
1700         }
1701
1702         if (phba->cfg_poll & DISABLE_FCP_RING_INT)
1703                 lpfc_sli_poll_fcp_ring (phba);
1704
1705         lpfc_cmd->waitq = &waitq;
1706         /* Wait for abort to complete */
1707         wait_event_timeout(waitq,
1708                           (lpfc_cmd->pCmd != cmnd),
1709                            (2*vport->cfg_devloss_tmo*HZ));
1710
1711         spin_lock_irq(shost->host_lock);
1712         lpfc_cmd->waitq = NULL;
1713         spin_unlock_irq(shost->host_lock);
1714
1715         if (lpfc_cmd->pCmd == cmnd) {
1716                 ret = FAILED;
1717                 lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
1718                                  "0748 abort handler timed out waiting "
1719                                  "for abort to complete: ret %#x, ID %d, "
1720                                  "LUN %d, snum %#lx\n",
1721                                  ret, cmnd->device->id, cmnd->device->lun,
1722                                  cmnd->serial_number);
1723         }
1724
1725  out:
1726         lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
1727                          "0749 SCSI Layer I/O Abort Request Status x%x ID %d "
1728                          "LUN %d snum %#lx\n", ret, cmnd->device->id,
1729                          cmnd->device->lun, cmnd->serial_number);
1730         return ret;
1731 }
1732
1733 /**
1734  * lpfc_device_reset_handler: eh_device_reset entry point of Scsi Host Template
1735  *data structure.
1736  * @cmnd: Pointer to scsi_cmnd data structure.
1737  *
1738  * This routine does a device reset by sending a TARGET_RESET task management
1739  * command.
1740  *
1741  * Return code :
1742  *  0x2003 - Error
1743  *  0ex2002 - Success
1744  **/
1745 static int
1746 lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
1747 {
1748         struct Scsi_Host  *shost = cmnd->device->host;
1749         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
1750         struct lpfc_hba   *phba = vport->phba;
1751         struct lpfc_scsi_buf *lpfc_cmd;
1752         struct lpfc_iocbq *iocbq, *iocbqrsp;
1753         struct lpfc_rport_data *rdata = cmnd->device->hostdata;
1754         struct lpfc_nodelist *pnode = rdata->pnode;
1755         unsigned long later;
1756         int ret = SUCCESS;
1757         int status;
1758         int cnt;
1759         struct lpfc_scsi_event_header scsi_event;
1760
1761         lpfc_block_error_handler(cmnd);
1762         /*
1763          * If target is not in a MAPPED state, delay the reset until
1764          * target is rediscovered or devloss timeout expires.
1765          */
1766         later = msecs_to_jiffies(2 * vport->cfg_devloss_tmo * 1000) + jiffies;
1767         while (time_after(later, jiffies)) {
1768                 if (!pnode || !NLP_CHK_NODE_ACT(pnode))
1769                         return FAILED;
1770                 if (pnode->nlp_state == NLP_STE_MAPPED_NODE)
1771                         break;
1772                 schedule_timeout_uninterruptible(msecs_to_jiffies(500));
1773                 rdata = cmnd->device->hostdata;
1774                 if (!rdata)
1775                         break;
1776                 pnode = rdata->pnode;
1777         }
1778
1779         scsi_event.event_type = FC_REG_SCSI_EVENT;
1780         scsi_event.subcategory = LPFC_EVENT_TGTRESET;
1781         scsi_event.lun = 0;
1782         memcpy(scsi_event.wwpn, &pnode->nlp_portname, sizeof(struct lpfc_name));
1783         memcpy(scsi_event.wwnn, &pnode->nlp_nodename, sizeof(struct lpfc_name));
1784
1785         fc_host_post_vendor_event(shost,
1786                 fc_get_event_number(),
1787                 sizeof(scsi_event),
1788                 (char *)&scsi_event,
1789                 LPFC_NL_VENDOR_ID);
1790
1791         if (!rdata || pnode->nlp_state != NLP_STE_MAPPED_NODE) {
1792                 lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
1793                                  "0721 LUN Reset rport "
1794                                  "failure: msec x%x rdata x%p\n",
1795                                  jiffies_to_msecs(jiffies - later), rdata);
1796                 return FAILED;
1797         }
1798         lpfc_cmd = lpfc_get_scsi_buf(phba);
1799         if (lpfc_cmd == NULL)
1800                 return FAILED;
1801         lpfc_cmd->timeout = 60;
1802         lpfc_cmd->rdata = rdata;
1803
1804         status = lpfc_scsi_prep_task_mgmt_cmd(vport, lpfc_cmd,
1805                                               cmnd->device->lun,
1806                                               FCP_TARGET_RESET);
1807         if (!status) {
1808                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1809                 return FAILED;
1810         }
1811         iocbq = &lpfc_cmd->cur_iocbq;
1812
1813         /* get a buffer for this IOCB command response */
1814         iocbqrsp = lpfc_sli_get_iocbq(phba);
1815         if (iocbqrsp == NULL) {
1816                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1817                 return FAILED;
1818         }
1819         lpfc_printf_vlog(vport, KERN_INFO, LOG_FCP,
1820                          "0703 Issue target reset to TGT %d LUN %d "
1821                          "rpi x%x nlp_flag x%x\n", cmnd->device->id,
1822                          cmnd->device->lun, pnode->nlp_rpi, pnode->nlp_flag);
1823         status = lpfc_sli_issue_iocb_wait(phba,
1824                                           &phba->sli.ring[phba->sli.fcp_ring],
1825                                           iocbq, iocbqrsp, lpfc_cmd->timeout);
1826         if (status == IOCB_TIMEDOUT) {
1827                 iocbq->iocb_cmpl = lpfc_tskmgmt_def_cmpl;
1828                 ret = TIMEOUT_ERROR;
1829         } else {
1830                 if (status != IOCB_SUCCESS)
1831                         ret = FAILED;
1832                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1833         }
1834         lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
1835                          "0713 SCSI layer issued device reset (%d, %d) "
1836                          "return x%x status x%x result x%x\n",
1837                          cmnd->device->id, cmnd->device->lun, ret,
1838                          iocbqrsp->iocb.ulpStatus,
1839                          iocbqrsp->iocb.un.ulpWord[4]);
1840         lpfc_sli_release_iocbq(phba, iocbqrsp);
1841         cnt = lpfc_sli_sum_iocb(vport, cmnd->device->id, cmnd->device->lun,
1842                                 LPFC_CTX_TGT);
1843         if (cnt)
1844                 lpfc_sli_abort_iocb(vport, &phba->sli.ring[phba->sli.fcp_ring],
1845                                     cmnd->device->id, cmnd->device->lun,
1846                                     LPFC_CTX_TGT);
1847         later = msecs_to_jiffies(2 * vport->cfg_devloss_tmo * 1000) + jiffies;
1848         while (time_after(later, jiffies) && cnt) {
1849                 schedule_timeout_uninterruptible(msecs_to_jiffies(20));
1850                 cnt = lpfc_sli_sum_iocb(vport, cmnd->device->id,
1851                                         cmnd->device->lun, LPFC_CTX_TGT);
1852         }
1853         if (cnt) {
1854                 lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
1855                                  "0719 device reset I/O flush failure: "
1856                                  "cnt x%x\n", cnt);
1857                 ret = FAILED;
1858         }
1859         return ret;
1860 }
1861
1862 /**
1863  * lpfc_bus_reset_handler: eh_bus_reset_handler entry point of Scsi Host
1864  * Template data structure.
1865  * @cmnd: Pointer to scsi_cmnd data structure.
1866  *
1867  * This routine does target reset to all target on @cmnd->device->host.
1868  *
1869  * Return Code:
1870  *   0x2003 - Error
1871  *   0x2002 - Success
1872  **/
1873 static int
1874 lpfc_bus_reset_handler(struct scsi_cmnd *cmnd)
1875 {
1876         struct Scsi_Host  *shost = cmnd->device->host;
1877         struct lpfc_vport *vport = (struct lpfc_vport *) shost->hostdata;
1878         struct lpfc_hba   *phba = vport->phba;
1879         struct lpfc_nodelist *ndlp = NULL;
1880         int match;
1881         int ret = SUCCESS, status = SUCCESS, i;
1882         int cnt;
1883         struct lpfc_scsi_buf * lpfc_cmd;
1884         unsigned long later;
1885         struct lpfc_scsi_event_header scsi_event;
1886
1887         scsi_event.event_type = FC_REG_SCSI_EVENT;
1888         scsi_event.subcategory = LPFC_EVENT_BUSRESET;
1889         scsi_event.lun = 0;
1890         memcpy(scsi_event.wwpn, &vport->fc_portname, sizeof(struct lpfc_name));
1891         memcpy(scsi_event.wwnn, &vport->fc_nodename, sizeof(struct lpfc_name));
1892
1893         fc_host_post_vendor_event(shost,
1894                 fc_get_event_number(),
1895                 sizeof(scsi_event),
1896                 (char *)&scsi_event,
1897                 LPFC_NL_VENDOR_ID);
1898
1899         lpfc_block_error_handler(cmnd);
1900         /*
1901          * Since the driver manages a single bus device, reset all
1902          * targets known to the driver.  Should any target reset
1903          * fail, this routine returns failure to the midlayer.
1904          */
1905         for (i = 0; i < LPFC_MAX_TARGET; i++) {
1906                 /* Search for mapped node by target ID */
1907                 match = 0;
1908                 spin_lock_irq(shost->host_lock);
1909                 list_for_each_entry(ndlp, &vport->fc_nodes, nlp_listp) {
1910                         if (!NLP_CHK_NODE_ACT(ndlp))
1911                                 continue;
1912                         if (ndlp->nlp_state == NLP_STE_MAPPED_NODE &&
1913                             ndlp->nlp_sid == i &&
1914                             ndlp->rport) {
1915                                 match = 1;
1916                                 break;
1917                         }
1918                 }
1919                 spin_unlock_irq(shost->host_lock);
1920                 if (!match)
1921                         continue;
1922                 lpfc_cmd = lpfc_get_scsi_buf(phba);
1923                 if (lpfc_cmd) {
1924                         lpfc_cmd->timeout = 60;
1925                         status = lpfc_scsi_tgt_reset(lpfc_cmd, vport, i,
1926                                                      cmnd->device->lun,
1927                                                      ndlp->rport->dd_data);
1928                         if (status != TIMEOUT_ERROR)
1929                                 lpfc_release_scsi_buf(phba, lpfc_cmd);
1930                 }
1931                 if (!lpfc_cmd || status != SUCCESS) {
1932                         lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
1933                                          "0700 Bus Reset on target %d failed\n",
1934                                          i);
1935                         ret = FAILED;
1936                 }
1937         }
1938         /*
1939          * All outstanding txcmplq I/Os should have been aborted by
1940          * the targets.  Unfortunately, some targets do not abide by
1941          * this forcing the driver to double check.
1942          */
1943         cnt = lpfc_sli_sum_iocb(vport, 0, 0, LPFC_CTX_HOST);
1944         if (cnt)
1945                 lpfc_sli_abort_iocb(vport, &phba->sli.ring[phba->sli.fcp_ring],
1946                                     0, 0, LPFC_CTX_HOST);
1947         later = msecs_to_jiffies(2 * vport->cfg_devloss_tmo * 1000) + jiffies;
1948         while (time_after(later, jiffies) && cnt) {
1949                 schedule_timeout_uninterruptible(msecs_to_jiffies(20));
1950                 cnt = lpfc_sli_sum_iocb(vport, 0, 0, LPFC_CTX_HOST);
1951         }
1952         if (cnt) {
1953                 lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
1954                                  "0715 Bus Reset I/O flush failure: "
1955                                  "cnt x%x left x%x\n", cnt, i);
1956                 ret = FAILED;
1957         }
1958         lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
1959                          "0714 SCSI layer issued Bus Reset Data: x%x\n", ret);
1960         return ret;
1961 }
1962
1963 /**
1964  * lpfc_slave_alloc: slave_alloc entry point of Scsi Host Template data
1965  * structure.
1966  * @sdev: Pointer to scsi_device.
1967  *
1968  * This routine populates the cmds_per_lun count + 2 scsi_bufs into  this host's
1969  * globally available list of scsi buffers. This routine also makes sure scsi
1970  * buffer is not allocated more than HBA limit conveyed to midlayer. This list
1971  * of scsi buffer exists for the lifetime of the driver.
1972  *
1973  * Return codes:
1974  *   non-0 - Error
1975  *   0 - Success
1976  **/
1977 static int
1978 lpfc_slave_alloc(struct scsi_device *sdev)
1979 {
1980         struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
1981         struct lpfc_hba   *phba = vport->phba;
1982         struct lpfc_scsi_buf *scsi_buf = NULL;
1983         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1984         uint32_t total = 0, i;
1985         uint32_t num_to_alloc = 0;
1986         unsigned long flags;
1987
1988         if (!rport || fc_remote_port_chkready(rport))
1989                 return -ENXIO;
1990
1991         sdev->hostdata = rport->dd_data;
1992
1993         /*
1994          * Populate the cmds_per_lun count scsi_bufs into this host's globally
1995          * available list of scsi buffers.  Don't allocate more than the
1996          * HBA limit conveyed to the midlayer via the host structure.  The
1997          * formula accounts for the lun_queue_depth + error handlers + 1
1998          * extra.  This list of scsi bufs exists for the lifetime of the driver.
1999          */
2000         total = phba->total_scsi_bufs;
2001         num_to_alloc = vport->cfg_lun_queue_depth + 2;
2002
2003         /* Allow some exchanges to be available always to complete discovery */
2004         if (total >= phba->cfg_hba_queue_depth - LPFC_DISC_IOCB_BUFF_COUNT ) {
2005                 lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
2006                                  "0704 At limitation of %d preallocated "
2007                                  "command buffers\n", total);
2008                 return 0;
2009         /* Allow some exchanges to be available always to complete discovery */
2010         } else if (total + num_to_alloc >
2011                 phba->cfg_hba_queue_depth - LPFC_DISC_IOCB_BUFF_COUNT ) {
2012                 lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP,
2013                                  "0705 Allocation request of %d "
2014                                  "command buffers will exceed max of %d.  "
2015                                  "Reducing allocation request to %d.\n",
2016                                  num_to_alloc, phba->cfg_hba_queue_depth,
2017                                  (phba->cfg_hba_queue_depth - total));
2018                 num_to_alloc = phba->cfg_hba_queue_depth - total;
2019         }
2020
2021         for (i = 0; i < num_to_alloc; i++) {
2022                 scsi_buf = lpfc_new_scsi_buf(vport);
2023                 if (!scsi_buf) {
2024                         lpfc_printf_vlog(vport, KERN_ERR, LOG_FCP,
2025                                          "0706 Failed to allocate "
2026                                          "command buffer\n");
2027                         break;
2028                 }
2029
2030                 spin_lock_irqsave(&phba->scsi_buf_list_lock, flags);
2031                 phba->total_scsi_bufs++;
2032                 list_add_tail(&scsi_buf->list, &phba->lpfc_scsi_buf_list);
2033                 spin_unlock_irqrestore(&phba->scsi_buf_list_lock, flags);
2034         }
2035         return 0;
2036 }
2037
2038 /**
2039  * lpfc_slave_configure: slave_configure entry point of Scsi Host Templater data
2040  *  structure.
2041  * @sdev: Pointer to scsi_device.
2042  *
2043  * This routine configures following items
2044  *   - Tag command queuing support for @sdev if supported.
2045  *   - Dev loss time out value of fc_rport.
2046  *   - Enable SLI polling for fcp ring if ENABLE_FCP_RING_POLLING flag is set.
2047  *
2048  * Return codes:
2049  *   0 - Success
2050  **/
2051 static int
2052 lpfc_slave_configure(struct scsi_device *sdev)
2053 {
2054         struct lpfc_vport *vport = (struct lpfc_vport *) sdev->host->hostdata;
2055         struct lpfc_hba   *phba = vport->phba;
2056         struct fc_rport   *rport = starget_to_rport(sdev->sdev_target);
2057
2058         if (sdev->tagged_supported)
2059                 scsi_activate_tcq(sdev, vport->cfg_lun_queue_depth);
2060         else
2061                 scsi_deactivate_tcq(sdev, vport->cfg_lun_queue_depth);
2062
2063         /*
2064          * Initialize the fc transport attributes for the target
2065          * containing this scsi device.  Also note that the driver's
2066          * target pointer is stored in the starget_data for the
2067          * driver's sysfs entry point functions.
2068          */
2069         rport->dev_loss_tmo = vport->cfg_devloss_tmo;
2070
2071         if (phba->cfg_poll & ENABLE_FCP_RING_POLLING) {
2072                 lpfc_sli_poll_fcp_ring(phba);
2073                 if (phba->cfg_poll & DISABLE_FCP_RING_INT)
2074                         lpfc_poll_rearm_timer(phba);
2075         }
2076
2077         return 0;
2078 }
2079
2080 /**
2081  * lpfc_slave_destroy: slave_destroy entry point of SHT data structure.
2082  * @sdev: Pointer to scsi_device.
2083  *
2084  * This routine sets @sdev hostatdata filed to null.
2085  **/
2086 static void
2087 lpfc_slave_destroy(struct scsi_device *sdev)
2088 {
2089         sdev->hostdata = NULL;
2090         return;
2091 }
2092
2093
2094 struct scsi_host_template lpfc_template = {
2095         .module                 = THIS_MODULE,
2096         .name                   = LPFC_DRIVER_NAME,
2097         .info                   = lpfc_info,
2098         .queuecommand           = lpfc_queuecommand,
2099         .eh_abort_handler       = lpfc_abort_handler,
2100         .eh_device_reset_handler= lpfc_device_reset_handler,
2101         .eh_bus_reset_handler   = lpfc_bus_reset_handler,
2102         .slave_alloc            = lpfc_slave_alloc,
2103         .slave_configure        = lpfc_slave_configure,
2104         .slave_destroy          = lpfc_slave_destroy,
2105         .scan_finished          = lpfc_scan_finished,
2106         .this_id                = -1,
2107         .sg_tablesize           = LPFC_DEFAULT_SG_SEG_CNT,
2108         .cmd_per_lun            = LPFC_CMD_PER_LUN,
2109         .use_clustering         = ENABLE_CLUSTERING,
2110         .shost_attrs            = lpfc_hba_attrs,
2111         .max_sectors            = 0xFFFF,
2112 };
2113
2114 struct scsi_host_template lpfc_vport_template = {
2115         .module                 = THIS_MODULE,
2116         .name                   = LPFC_DRIVER_NAME,
2117         .info                   = lpfc_info,
2118         .queuecommand           = lpfc_queuecommand,
2119         .eh_abort_handler       = lpfc_abort_handler,
2120         .eh_device_reset_handler= lpfc_device_reset_handler,
2121         .eh_bus_reset_handler   = lpfc_bus_reset_handler,
2122         .slave_alloc            = lpfc_slave_alloc,
2123         .slave_configure        = lpfc_slave_configure,
2124         .slave_destroy          = lpfc_slave_destroy,
2125         .scan_finished          = lpfc_scan_finished,
2126         .this_id                = -1,
2127         .sg_tablesize           = LPFC_DEFAULT_SG_SEG_CNT,
2128         .cmd_per_lun            = LPFC_CMD_PER_LUN,
2129         .use_clustering         = ENABLE_CLUSTERING,
2130         .shost_attrs            = lpfc_vport_attrs,
2131         .max_sectors            = 0xFFFF,
2132 };