drivers/scsi/snic/snic

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This source file includes following definitions.
snic_slave_alloc
snic_slave_configure
snic_change_queue_depth
snic_handle_link_event
snic_notify_set
snic_dev_wait
snic_cleanup
snic_iounmap
snic_vdev_open_done
snic_add_host
snic_del_host
snic_get_state
snic_set_state
snic_probe
snic_remove
snic_global_data_init
snic_global_data_cleanup
snic_init_module
snic_cleanup_module
   1 /*
   2  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  */
  17 
  18 #include <linux/module.h>
  19 #include <linux/mempool.h>
  20 #include <linux/string.h>
  21 #include <linux/slab.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/pci.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/workqueue.h>
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_tcq.h>
  31 
  32 #include "snic.h"
  33 #include "snic_fwint.h"
  34 
  35 #define PCI_DEVICE_ID_CISCO_SNIC        0x0046
  36 
  37 /* Supported devices by snic module */
  38 static struct pci_device_id snic_id_table[] = {
  39         {PCI_DEVICE(0x1137, PCI_DEVICE_ID_CISCO_SNIC) },
  40         { 0, }  /* end of table */
  41 };
  42 
  43 unsigned int snic_log_level = 0x0;
  44 module_param(snic_log_level, int, S_IRUGO|S_IWUSR);
  45 MODULE_PARM_DESC(snic_log_level, "bitmask for snic logging levels");
  46 
  47 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
  48 unsigned int snic_trace_max_pages = 16;
  49 module_param(snic_trace_max_pages, uint, S_IRUGO|S_IWUSR);
  50 MODULE_PARM_DESC(snic_trace_max_pages,
  51                 "Total allocated memory pages for snic trace buffer");
  52 
  53 #endif
  54 unsigned int snic_max_qdepth = SNIC_DFLT_QUEUE_DEPTH;
  55 module_param(snic_max_qdepth, uint, S_IRUGO | S_IWUSR);
  56 MODULE_PARM_DESC(snic_max_qdepth, "Queue depth to report for each LUN");
  57 
  58 /*
  59  * snic_slave_alloc : callback function to SCSI Mid Layer, called on
  60  * scsi device initialization.
  61  */
  62 static int
  63 snic_slave_alloc(struct scsi_device *sdev)
  64 {
  65         struct snic_tgt *tgt = starget_to_tgt(scsi_target(sdev));
  66 
  67         if (!tgt || snic_tgt_chkready(tgt))
  68                 return -ENXIO;
  69 
  70         return 0;
  71 }
  72 
  73 /*
  74  * snic_slave_configure : callback function to SCSI Mid Layer, called on
  75  * scsi device initialization.
  76  */
  77 static int
  78 snic_slave_configure(struct scsi_device *sdev)
  79 {
  80         struct snic *snic = shost_priv(sdev->host);
  81         u32 qdepth = 0, max_ios = 0;
  82         int tmo = SNIC_DFLT_CMD_TIMEOUT * HZ;
  83 
  84         /* Set Queue Depth */
  85         max_ios = snic_max_qdepth;
  86         qdepth = min_t(u32, max_ios, SNIC_MAX_QUEUE_DEPTH);
  87         scsi_change_queue_depth(sdev, qdepth);
  88 
  89         if (snic->fwinfo.io_tmo > 1)
  90                 tmo = snic->fwinfo.io_tmo * HZ;
  91 
  92         /* FW requires extended timeouts */
  93         blk_queue_rq_timeout(sdev->request_queue, tmo);
  94 
  95         return 0;
  96 }
  97 
  98 static int
  99 snic_change_queue_depth(struct scsi_device *sdev, int qdepth)
 100 {
 101         struct snic *snic = shost_priv(sdev->host);
 102         int qsz = 0;
 103 
 104         qsz = min_t(u32, qdepth, SNIC_MAX_QUEUE_DEPTH);
 105         if (qsz < sdev->queue_depth)
 106                 atomic64_inc(&snic->s_stats.misc.qsz_rampdown);
 107         else if (qsz > sdev->queue_depth)
 108                 atomic64_inc(&snic->s_stats.misc.qsz_rampup);
 109 
 110         atomic64_set(&snic->s_stats.misc.last_qsz, sdev->queue_depth);
 111 
 112         scsi_change_queue_depth(sdev, qsz);
 113 
 114         return sdev->queue_depth;
 115 }
 116 
 117 static struct scsi_host_template snic_host_template = {
 118         .module = THIS_MODULE,
 119         .name = SNIC_DRV_NAME,
 120         .queuecommand = snic_queuecommand,
 121         .eh_abort_handler = snic_abort_cmd,
 122         .eh_device_reset_handler = snic_device_reset,
 123         .eh_host_reset_handler = snic_host_reset,
 124         .slave_alloc = snic_slave_alloc,
 125         .slave_configure = snic_slave_configure,
 126         .change_queue_depth = snic_change_queue_depth,
 127         .this_id = -1,
 128         .cmd_per_lun = SNIC_DFLT_QUEUE_DEPTH,
 129         .can_queue = SNIC_MAX_IO_REQ,
 130         .sg_tablesize = SNIC_MAX_SG_DESC_CNT,
 131         .max_sectors = 0x800,
 132         .shost_attrs = snic_attrs,
 133         .track_queue_depth = 1,
 134         .cmd_size = sizeof(struct snic_internal_io_state),
 135         .proc_name = "snic_scsi",
 136 };
 137 
 138 /*
 139  * snic_handle_link_event : Handles link events such as link up/down/error
 140  */
 141 void
 142 snic_handle_link_event(struct snic *snic)
 143 {
 144         unsigned long flags;
 145 
 146         spin_lock_irqsave(&snic->snic_lock, flags);
 147         if (snic->stop_link_events) {
 148                 spin_unlock_irqrestore(&snic->snic_lock, flags);
 149 
 150                 return;
 151         }
 152         spin_unlock_irqrestore(&snic->snic_lock, flags);
 153 
 154         queue_work(snic_glob->event_q, &snic->link_work);
 155 } /* end of snic_handle_link_event */
 156 
 157 /*
 158  * snic_notify_set : sets notification area
 159  * This notification area is to receive events from fw
 160  * Note: snic supports only MSIX interrupts, in which we can just call
 161  *  svnic_dev_notify_set directly
 162  */
 163 static int
 164 snic_notify_set(struct snic *snic)
 165 {
 166         int ret = 0;
 167         enum vnic_dev_intr_mode intr_mode;
 168 
 169         intr_mode = svnic_dev_get_intr_mode(snic->vdev);
 170 
 171         if (intr_mode == VNIC_DEV_INTR_MODE_MSIX) {
 172                 ret = svnic_dev_notify_set(snic->vdev, SNIC_MSIX_ERR_NOTIFY);
 173         } else {
 174                 SNIC_HOST_ERR(snic->shost,
 175                               "Interrupt mode should be setup before devcmd notify set %d\n",
 176                               intr_mode);
 177                 ret = -1;
 178         }
 179 
 180         return ret;
 181 } /* end of snic_notify_set */
 182 
 183 /*
 184  * snic_dev_wait : polls vnic open status.
 185  */
 186 static int
 187 snic_dev_wait(struct vnic_dev *vdev,
 188                 int (*start)(struct vnic_dev *, int),
 189                 int (*finished)(struct vnic_dev *, int *),
 190                 int arg)
 191 {
 192         unsigned long time;
 193         int ret, done;
 194         int retry_cnt = 0;
 195 
 196         ret = start(vdev, arg);
 197         if (ret)
 198                 return ret;
 199 
 200         /*
 201          * Wait for func to complete...2 seconds max.
 202          *
 203          * Sometimes schedule_timeout_uninterruptible take long time
 204          * to wakeup, which results skipping retry. The retry counter
 205          * ensures to retry at least two times.
 206          */
 207         time = jiffies + (HZ * 2);
 208         do {
 209                 ret = finished(vdev, &done);
 210                 if (ret)
 211                         return ret;
 212 
 213                 if (done)
 214                         return 0;
 215                 schedule_timeout_uninterruptible(HZ/10);
 216                 ++retry_cnt;
 217         } while (time_after(time, jiffies) || (retry_cnt < 3));
 218 
 219         return -ETIMEDOUT;
 220 } /* end of snic_dev_wait */
 221 
 222 /*
 223  * snic_cleanup: called by snic_remove
 224  * Stops the snic device, masks all interrupts, Completed CQ entries are
 225  * drained. Posted WQ/RQ/Copy-WQ entries are cleanup
 226  */
 227 static int
 228 snic_cleanup(struct snic *snic)
 229 {
 230         unsigned int i;
 231         int ret;
 232 
 233         svnic_dev_disable(snic->vdev);
 234         for (i = 0; i < snic->intr_count; i++)
 235                 svnic_intr_mask(&snic->intr[i]);
 236 
 237         for (i = 0; i < snic->wq_count; i++) {
 238                 ret = svnic_wq_disable(&snic->wq[i]);
 239                 if (ret)
 240                         return ret;
 241         }
 242 
 243         /* Clean up completed IOs */
 244         snic_fwcq_cmpl_handler(snic, -1);
 245 
 246         snic_wq_cmpl_handler(snic, -1);
 247 
 248         /* Clean up the IOs that have not completed */
 249         for (i = 0; i < snic->wq_count; i++)
 250                 svnic_wq_clean(&snic->wq[i], snic_free_wq_buf);
 251 
 252         for (i = 0; i < snic->cq_count; i++)
 253                 svnic_cq_clean(&snic->cq[i]);
 254 
 255         for (i = 0; i < snic->intr_count; i++)
 256                 svnic_intr_clean(&snic->intr[i]);
 257 
 258         /* Cleanup snic specific requests */
 259         snic_free_all_untagged_reqs(snic);
 260 
 261         /* Cleanup Pending SCSI commands */
 262         snic_shutdown_scsi_cleanup(snic);
 263 
 264         for (i = 0; i < SNIC_REQ_MAX_CACHES; i++)
 265                 mempool_destroy(snic->req_pool[i]);
 266 
 267         return 0;
 268 } /* end of snic_cleanup */
 269 
 270 
 271 static void
 272 snic_iounmap(struct snic *snic)
 273 {
 274         if (snic->bar0.vaddr)
 275                 iounmap(snic->bar0.vaddr);
 276 }
 277 
 278 /*
 279  * snic_vdev_open_done : polls for svnic_dev_open cmd completion.
 280  */
 281 static int
 282 snic_vdev_open_done(struct vnic_dev *vdev, int *done)
 283 {
 284         struct snic *snic = svnic_dev_priv(vdev);
 285         int ret;
 286         int nretries = 5;
 287 
 288         do {
 289                 ret = svnic_dev_open_done(vdev, done);
 290                 if (ret == 0)
 291                         break;
 292 
 293                 SNIC_HOST_INFO(snic->shost, "VNIC_DEV_OPEN Timedout.\n");
 294         } while (nretries--);
 295 
 296         return ret;
 297 } /* end of snic_vdev_open_done */
 298 
 299 /*
 300  * snic_add_host : registers scsi host with ML
 301  */
 302 static int
 303 snic_add_host(struct Scsi_Host *shost, struct pci_dev *pdev)
 304 {
 305         int ret = 0;
 306 
 307         ret = scsi_add_host(shost, &pdev->dev);
 308         if (ret) {
 309                 SNIC_HOST_ERR(shost,
 310                               "snic: scsi_add_host failed. %d\n",
 311                               ret);
 312 
 313                 return ret;
 314         }
 315 
 316         SNIC_BUG_ON(shost->work_q != NULL);
 317         snprintf(shost->work_q_name, sizeof(shost->work_q_name), "scsi_wq_%d",
 318                  shost->host_no);
 319         shost->work_q = create_singlethread_workqueue(shost->work_q_name);
 320         if (!shost->work_q) {
 321                 SNIC_HOST_ERR(shost, "Failed to Create ScsiHost wq.\n");
 322 
 323                 ret = -ENOMEM;
 324         }
 325 
 326         return ret;
 327 } /* end of snic_add_host */
 328 
 329 static void
 330 snic_del_host(struct Scsi_Host *shost)
 331 {
 332         if (!shost->work_q)
 333                 return;
 334 
 335         destroy_workqueue(shost->work_q);
 336         shost->work_q = NULL;
 337         scsi_remove_host(shost);
 338 }
 339 
 340 int
 341 snic_get_state(struct snic *snic)
 342 {
 343         return atomic_read(&snic->state);
 344 }
 345 
 346 void
 347 snic_set_state(struct snic *snic, enum snic_state state)
 348 {
 349         SNIC_HOST_INFO(snic->shost, "snic state change from %s to %s\n",
 350                        snic_state_to_str(snic_get_state(snic)),
 351                        snic_state_to_str(state));
 352 
 353         atomic_set(&snic->state, state);
 354 }
 355 
 356 /*
 357  * snic_probe : Initialize the snic interface.
 358  */
 359 static int
 360 snic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 361 {
 362         struct Scsi_Host *shost;
 363         struct snic *snic;
 364         mempool_t *pool;
 365         unsigned long flags;
 366         u32 max_ios = 0;
 367         int ret, i;
 368 
 369         /* Device Information */
 370         SNIC_INFO("snic device %4x:%4x:%4x:%4x: ",
 371                   pdev->vendor, pdev->device, pdev->subsystem_vendor,
 372                   pdev->subsystem_device);
 373 
 374         SNIC_INFO("snic device bus %x: slot %x: fn %x\n",
 375                   pdev->bus->number, PCI_SLOT(pdev->devfn),
 376                   PCI_FUNC(pdev->devfn));
 377 
 378         /*
 379          * Allocate SCSI Host and setup association between host, and snic
 380          */
 381         shost = scsi_host_alloc(&snic_host_template, sizeof(struct snic));
 382         if (!shost) {
 383                 SNIC_ERR("Unable to alloc scsi_host\n");
 384                 ret = -ENOMEM;
 385 
 386                 goto prob_end;
 387         }
 388         snic = shost_priv(shost);
 389         snic->shost = shost;
 390 
 391         snprintf(snic->name, sizeof(snic->name) - 1, "%s%d", SNIC_DRV_NAME,
 392                  shost->host_no);
 393 
 394         SNIC_HOST_INFO(shost,
 395                        "snic%d = %p shost = %p device bus %x: slot %x: fn %x\n",
 396                        shost->host_no, snic, shost, pdev->bus->number,
 397                        PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
 398 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 399         /* Per snic debugfs init */
 400         snic_stats_debugfs_init(snic);
 401 #endif
 402 
 403         /* Setup PCI Resources */
 404         pci_set_drvdata(pdev, snic);
 405         snic->pdev = pdev;
 406 
 407         ret = pci_enable_device(pdev);
 408         if (ret) {
 409                 SNIC_HOST_ERR(shost,
 410                               "Cannot enable PCI Resources, aborting : %d\n",
 411                               ret);
 412 
 413                 goto err_free_snic;
 414         }
 415 
 416         ret = pci_request_regions(pdev, SNIC_DRV_NAME);
 417         if (ret) {
 418                 SNIC_HOST_ERR(shost,
 419                               "Cannot obtain PCI Resources, aborting : %d\n",
 420                               ret);
 421 
 422                 goto err_pci_disable;
 423         }
 424 
 425         pci_set_master(pdev);
 426 
 427         /*
 428          * Query PCI Controller on system for DMA addressing
 429          * limitation for the device. Try 43-bit first, and
 430          * fail to 32-bit.
 431          */
 432         ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(43));
 433         if (ret) {
 434                 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 435                 if (ret) {
 436                         SNIC_HOST_ERR(shost,
 437                                       "No Usable DMA Configuration, aborting %d\n",
 438                                       ret);
 439                         goto err_rel_regions;
 440                 }
 441         }
 442 
 443         /* Map vNIC resources from BAR0 */
 444         if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
 445                 SNIC_HOST_ERR(shost, "BAR0 not memory mappable aborting.\n");
 446 
 447                 ret = -ENODEV;
 448                 goto err_rel_regions;
 449         }
 450 
 451         snic->bar0.vaddr = pci_iomap(pdev, 0, 0);
 452         if (!snic->bar0.vaddr) {
 453                 SNIC_HOST_ERR(shost,
 454                               "Cannot memory map BAR0 res hdr aborting.\n");
 455 
 456                 ret = -ENODEV;
 457                 goto err_rel_regions;
 458         }
 459 
 460         snic->bar0.bus_addr = pci_resource_start(pdev, 0);
 461         snic->bar0.len = pci_resource_len(pdev, 0);
 462         SNIC_BUG_ON(snic->bar0.bus_addr == 0);
 463 
 464         /* Devcmd2 Resource Allocation and Initialization */
 465         snic->vdev = svnic_dev_alloc_discover(NULL, snic, pdev, &snic->bar0, 1);
 466         if (!snic->vdev) {
 467                 SNIC_HOST_ERR(shost, "vNIC Resource Discovery Failed.\n");
 468 
 469                 ret = -ENODEV;
 470                 goto err_iounmap;
 471         }
 472 
 473         ret = svnic_dev_cmd_init(snic->vdev, 0);
 474         if (ret) {
 475                 SNIC_HOST_INFO(shost, "Devcmd2 Init Failed. err = %d\n", ret);
 476 
 477                 goto err_vnic_unreg;
 478         }
 479 
 480         ret = snic_dev_wait(snic->vdev, svnic_dev_open, snic_vdev_open_done, 0);
 481         if (ret) {
 482                 SNIC_HOST_ERR(shost,
 483                               "vNIC dev open failed, aborting. %d\n",
 484                               ret);
 485 
 486                 goto err_vnic_unreg;
 487         }
 488 
 489         ret = svnic_dev_init(snic->vdev, 0);
 490         if (ret) {
 491                 SNIC_HOST_ERR(shost,
 492                               "vNIC dev init failed. aborting. %d\n",
 493                               ret);
 494 
 495                 goto err_dev_close;
 496         }
 497 
 498         /* Get vNIC information */
 499         ret = snic_get_vnic_config(snic);
 500         if (ret) {
 501                 SNIC_HOST_ERR(shost,
 502                               "Get vNIC configuration failed, aborting. %d\n",
 503                               ret);
 504 
 505                 goto err_dev_close;
 506         }
 507 
 508         /* Configure Maximum Outstanding IO reqs */
 509         max_ios = snic->config.io_throttle_count;
 510         if (max_ios != SNIC_UCSM_DFLT_THROTTLE_CNT_BLD)
 511                 shost->can_queue = min_t(u32, SNIC_MAX_IO_REQ,
 512                                          max_t(u32, SNIC_MIN_IO_REQ, max_ios));
 513 
 514         snic->max_tag_id = shost->can_queue;
 515 
 516         shost->max_lun = snic->config.luns_per_tgt;
 517         shost->max_id = SNIC_MAX_TARGET;
 518 
 519         shost->max_cmd_len = MAX_COMMAND_SIZE; /*defined in scsi_cmnd.h*/
 520 
 521         snic_get_res_counts(snic);
 522 
 523         /*
 524          * Assumption: Only MSIx is supported
 525          */
 526         ret = snic_set_intr_mode(snic);
 527         if (ret) {
 528                 SNIC_HOST_ERR(shost,
 529                               "Failed to set intr mode aborting. %d\n",
 530                               ret);
 531 
 532                 goto err_dev_close;
 533         }
 534 
 535         ret = snic_alloc_vnic_res(snic);
 536         if (ret) {
 537                 SNIC_HOST_ERR(shost,
 538                               "Failed to alloc vNIC resources aborting. %d\n",
 539                               ret);
 540 
 541                 goto err_clear_intr;
 542         }
 543 
 544         /* Initialize specific lists */
 545         INIT_LIST_HEAD(&snic->list);
 546 
 547         /*
 548          * spl_cmd_list for maintaining snic specific cmds
 549          * such as EXCH_VER_REQ, REPORT_TARGETS etc
 550          */
 551         INIT_LIST_HEAD(&snic->spl_cmd_list);
 552         spin_lock_init(&snic->spl_cmd_lock);
 553 
 554         /* initialize all snic locks */
 555         spin_lock_init(&snic->snic_lock);
 556 
 557         for (i = 0; i < SNIC_WQ_MAX; i++)
 558                 spin_lock_init(&snic->wq_lock[i]);
 559 
 560         for (i = 0; i < SNIC_IO_LOCKS; i++)
 561                 spin_lock_init(&snic->io_req_lock[i]);
 562 
 563         pool = mempool_create_slab_pool(2,
 564                                 snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
 565         if (!pool) {
 566                 SNIC_HOST_ERR(shost, "dflt sgl pool creation failed\n");
 567 
 568                 ret = -ENOMEM;
 569                 goto err_free_res;
 570         }
 571 
 572         snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL] = pool;
 573 
 574         pool = mempool_create_slab_pool(2,
 575                                 snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
 576         if (!pool) {
 577                 SNIC_HOST_ERR(shost, "max sgl pool creation failed\n");
 578 
 579                 ret = -ENOMEM;
 580                 goto err_free_dflt_sgl_pool;
 581         }
 582 
 583         snic->req_pool[SNIC_REQ_CACHE_MAX_SGL] = pool;
 584 
 585         pool = mempool_create_slab_pool(2,
 586                                 snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
 587         if (!pool) {
 588                 SNIC_HOST_ERR(shost, "snic tmreq info pool creation failed.\n");
 589 
 590                 ret = -ENOMEM;
 591                 goto err_free_max_sgl_pool;
 592         }
 593 
 594         snic->req_pool[SNIC_REQ_TM_CACHE] = pool;
 595 
 596         /* Initialize snic state */
 597         atomic_set(&snic->state, SNIC_INIT);
 598 
 599         atomic_set(&snic->ios_inflight, 0);
 600 
 601         /* Setup notification buffer area */
 602         ret = snic_notify_set(snic);
 603         if (ret) {
 604                 SNIC_HOST_ERR(shost,
 605                               "Failed to alloc notify buffer aborting. %d\n",
 606                               ret);
 607 
 608                 goto err_free_tmreq_pool;
 609         }
 610 
 611         spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
 612         list_add_tail(&snic->list, &snic_glob->snic_list);
 613         spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);
 614 
 615         snic_disc_init(&snic->disc);
 616         INIT_WORK(&snic->tgt_work, snic_handle_tgt_disc);
 617         INIT_WORK(&snic->disc_work, snic_handle_disc);
 618         INIT_WORK(&snic->link_work, snic_handle_link);
 619 
 620         /* Enable all queues */
 621         for (i = 0; i < snic->wq_count; i++)
 622                 svnic_wq_enable(&snic->wq[i]);
 623 
 624         ret = svnic_dev_enable_wait(snic->vdev);
 625         if (ret) {
 626                 SNIC_HOST_ERR(shost,
 627                               "vNIC dev enable failed w/ error %d\n",
 628                               ret);
 629 
 630                 goto err_vdev_enable;
 631         }
 632 
 633         ret = snic_request_intr(snic);
 634         if (ret) {
 635                 SNIC_HOST_ERR(shost, "Unable to request irq. %d\n", ret);
 636 
 637                 goto err_req_intr;
 638         }
 639 
 640         for (i = 0; i < snic->intr_count; i++)
 641                 svnic_intr_unmask(&snic->intr[i]);
 642 
 643         /* Get snic params */
 644         ret = snic_get_conf(snic);
 645         if (ret) {
 646                 SNIC_HOST_ERR(shost,
 647                               "Failed to get snic io config from FW w err %d\n",
 648                               ret);
 649 
 650                 goto err_get_conf;
 651         }
 652 
 653         /*
 654          * Initialization done with PCI system, hardware, firmware.
 655          * Add shost to SCSI
 656          */
 657         ret = snic_add_host(shost, pdev);
 658         if (ret) {
 659                 SNIC_HOST_ERR(shost,
 660                               "Adding scsi host Failed ... exiting. %d\n",
 661                               ret);
 662 
 663                 goto err_get_conf;
 664         }
 665 
 666         snic_set_state(snic, SNIC_ONLINE);
 667 
 668         ret = snic_disc_start(snic);
 669         if (ret) {
 670                 SNIC_HOST_ERR(shost, "snic_probe:Discovery Failed w err = %d\n",
 671                               ret);
 672 
 673                 goto err_get_conf;
 674         }
 675 
 676         SNIC_HOST_INFO(shost, "SNIC Device Probe Successful.\n");
 677 
 678         return 0;
 679 
 680 err_get_conf:
 681         snic_free_all_untagged_reqs(snic);
 682 
 683         for (i = 0; i < snic->intr_count; i++)
 684                 svnic_intr_mask(&snic->intr[i]);
 685 
 686         snic_free_intr(snic);
 687 
 688 err_req_intr:
 689         svnic_dev_disable(snic->vdev);
 690 
 691 err_vdev_enable:
 692         svnic_dev_notify_unset(snic->vdev);
 693 
 694         for (i = 0; i < snic->wq_count; i++) {
 695                 int rc = 0;
 696 
 697                 rc = svnic_wq_disable(&snic->wq[i]);
 698                 if (rc) {
 699                         SNIC_HOST_ERR(shost,
 700                                       "WQ Disable Failed w/ err = %d\n", rc);
 701 
 702                          break;
 703                 }
 704         }
 705         snic_del_host(snic->shost);
 706 
 707 err_free_tmreq_pool:
 708         mempool_destroy(snic->req_pool[SNIC_REQ_TM_CACHE]);
 709 
 710 err_free_max_sgl_pool:
 711         mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_MAX_SGL]);
 712 
 713 err_free_dflt_sgl_pool:
 714         mempool_destroy(snic->req_pool[SNIC_REQ_CACHE_DFLT_SGL]);
 715 
 716 err_free_res:
 717         snic_free_vnic_res(snic);
 718 
 719 err_clear_intr:
 720         snic_clear_intr_mode(snic);
 721 
 722 err_dev_close:
 723         svnic_dev_close(snic->vdev);
 724 
 725 err_vnic_unreg:
 726         svnic_dev_unregister(snic->vdev);
 727 
 728 err_iounmap:
 729         snic_iounmap(snic);
 730 
 731 err_rel_regions:
 732         pci_release_regions(pdev);
 733 
 734 err_pci_disable:
 735         pci_disable_device(pdev);
 736 
 737 err_free_snic:
 738 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 739         snic_stats_debugfs_remove(snic);
 740 #endif
 741         scsi_host_put(shost);
 742         pci_set_drvdata(pdev, NULL);
 743 
 744 prob_end:
 745         SNIC_INFO("sNIC device : bus %d: slot %d: fn %d Registration Failed.\n",
 746                   pdev->bus->number, PCI_SLOT(pdev->devfn),
 747                   PCI_FUNC(pdev->devfn));
 748 
 749         return ret;
 750 } /* end of snic_probe */
 751 
 752 
 753 /*
 754  * snic_remove : invoked on unbinding the interface to cleanup the
 755  * resources allocated in snic_probe on initialization.
 756  */
 757 static void
 758 snic_remove(struct pci_dev *pdev)
 759 {
 760         struct snic *snic = pci_get_drvdata(pdev);
 761         unsigned long flags;
 762 
 763         if (!snic) {
 764                 SNIC_INFO("sNIC dev: bus %d slot %d fn %d snic inst is null.\n",
 765                           pdev->bus->number, PCI_SLOT(pdev->devfn),
 766                           PCI_FUNC(pdev->devfn));
 767 
 768                 return;
 769         }
 770 
 771         /*
 772          * Mark state so that the workqueue thread stops forwarding
 773          * received frames and link events. ISR and other threads
 774          * that can queue work items will also stop creating work
 775          * items on the snic workqueue
 776          */
 777         snic_set_state(snic, SNIC_OFFLINE);
 778         spin_lock_irqsave(&snic->snic_lock, flags);
 779         snic->stop_link_events = 1;
 780         spin_unlock_irqrestore(&snic->snic_lock, flags);
 781 
 782         flush_workqueue(snic_glob->event_q);
 783         snic_disc_term(snic);
 784 
 785         spin_lock_irqsave(&snic->snic_lock, flags);
 786         snic->in_remove = 1;
 787         spin_unlock_irqrestore(&snic->snic_lock, flags);
 788 
 789         /*
 790          * This stops the snic device, masks all interrupts, Completed
 791          * CQ entries are drained. Posted WQ/RQ/Copy-WQ entries are
 792          * cleanup
 793          */
 794         snic_cleanup(snic);
 795 
 796         spin_lock_irqsave(&snic_glob->snic_list_lock, flags);
 797         list_del(&snic->list);
 798         spin_unlock_irqrestore(&snic_glob->snic_list_lock, flags);
 799 
 800         snic_tgt_del_all(snic);
 801 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 802         snic_stats_debugfs_remove(snic);
 803 #endif
 804         snic_del_host(snic->shost);
 805 
 806         svnic_dev_notify_unset(snic->vdev);
 807         snic_free_intr(snic);
 808         snic_free_vnic_res(snic);
 809         snic_clear_intr_mode(snic);
 810         svnic_dev_close(snic->vdev);
 811         svnic_dev_unregister(snic->vdev);
 812         snic_iounmap(snic);
 813         pci_release_regions(pdev);
 814         pci_disable_device(pdev);
 815         pci_set_drvdata(pdev, NULL);
 816 
 817         /* this frees Scsi_Host and snic memory (continuous chunk) */
 818         scsi_host_put(snic->shost);
 819 } /* end of snic_remove */
 820 
 821 
 822 struct snic_global *snic_glob;
 823 
 824 /*
 825  * snic_global_data_init: Initialize SNIC Global Data
 826  * Notes: All the global lists, variables should be part of global data
 827  * this helps in debugging.
 828  */
 829 static int
 830 snic_global_data_init(void)
 831 {
 832         int ret = 0;
 833         struct kmem_cache *cachep;
 834         ssize_t len = 0;
 835 
 836         snic_glob = kzalloc(sizeof(*snic_glob), GFP_KERNEL);
 837 
 838         if (!snic_glob) {
 839                 SNIC_ERR("Failed to allocate Global Context.\n");
 840 
 841                 ret = -ENOMEM;
 842                 goto gdi_end;
 843         }
 844 
 845 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 846         /* Debugfs related Initialization */
 847         /* Create debugfs entries for snic */
 848         snic_debugfs_init();
 849 
 850         /* Trace related Initialization */
 851         /* Allocate memory for trace buffer */
 852         ret = snic_trc_init();
 853         if (ret < 0) {
 854                 SNIC_ERR("Trace buffer init failed, SNIC tracing disabled\n");
 855                 snic_trc_free();
 856                 /* continue even if it fails */
 857         }
 858 
 859 #endif
 860         INIT_LIST_HEAD(&snic_glob->snic_list);
 861         spin_lock_init(&snic_glob->snic_list_lock);
 862 
 863         /* Create a cache for allocation of snic_host_req+default size ESGLs */
 864         len = sizeof(struct snic_req_info);
 865         len += sizeof(struct snic_host_req) + sizeof(struct snic_dflt_sgl);
 866         cachep = kmem_cache_create("snic_req_dfltsgl", len, SNIC_SG_DESC_ALIGN,
 867                                    SLAB_HWCACHE_ALIGN, NULL);
 868         if (!cachep) {
 869                 SNIC_ERR("Failed to create snic default sgl slab\n");
 870                 ret = -ENOMEM;
 871 
 872                 goto err_dflt_req_slab;
 873         }
 874         snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL] = cachep;
 875 
 876         /* Create a cache for allocation of max size Extended SGLs */
 877         len = sizeof(struct snic_req_info);
 878         len += sizeof(struct snic_host_req) + sizeof(struct snic_max_sgl);
 879         cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
 880                                    SLAB_HWCACHE_ALIGN, NULL);
 881         if (!cachep) {
 882                 SNIC_ERR("Failed to create snic max sgl slab\n");
 883                 ret = -ENOMEM;
 884 
 885                 goto err_max_req_slab;
 886         }
 887         snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL] = cachep;
 888 
 889         len = sizeof(struct snic_host_req);
 890         cachep = kmem_cache_create("snic_req_maxsgl", len, SNIC_SG_DESC_ALIGN,
 891                                    SLAB_HWCACHE_ALIGN, NULL);
 892         if (!cachep) {
 893                 SNIC_ERR("Failed to create snic tm req slab\n");
 894                 ret = -ENOMEM;
 895 
 896                 goto err_tmreq_slab;
 897         }
 898         snic_glob->req_cache[SNIC_REQ_TM_CACHE] = cachep;
 899 
 900         /* snic_event queue */
 901         snic_glob->event_q = create_singlethread_workqueue("snic_event_wq");
 902         if (!snic_glob->event_q) {
 903                 SNIC_ERR("snic event queue create failed\n");
 904                 ret = -ENOMEM;
 905 
 906                 goto err_eventq;
 907         }
 908 
 909         return ret;
 910 
 911 err_eventq:
 912         kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
 913 
 914 err_tmreq_slab:
 915         kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
 916 
 917 err_max_req_slab:
 918         kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
 919 
 920 err_dflt_req_slab:
 921 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 922         snic_trc_free();
 923         snic_debugfs_term();
 924 #endif
 925         kfree(snic_glob);
 926         snic_glob = NULL;
 927 
 928 gdi_end:
 929         return ret;
 930 } /* end of snic_glob_init */
 931 
 932 /*
 933  * snic_global_data_cleanup : Frees SNIC Global Data
 934  */
 935 static void
 936 snic_global_data_cleanup(void)
 937 {
 938         SNIC_BUG_ON(snic_glob == NULL);
 939 
 940         destroy_workqueue(snic_glob->event_q);
 941         kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_TM_CACHE]);
 942         kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_MAX_SGL]);
 943         kmem_cache_destroy(snic_glob->req_cache[SNIC_REQ_CACHE_DFLT_SGL]);
 944 
 945 #ifdef CONFIG_SCSI_SNIC_DEBUG_FS
 946         /* Freeing Trace Resources */
 947         snic_trc_free();
 948 
 949         /* Freeing Debugfs Resources */
 950         snic_debugfs_term();
 951 #endif
 952         kfree(snic_glob);
 953         snic_glob = NULL;
 954 } /* end of snic_glob_cleanup */
 955 
 956 static struct pci_driver snic_driver = {
 957         .name = SNIC_DRV_NAME,
 958         .id_table = snic_id_table,
 959         .probe = snic_probe,
 960         .remove = snic_remove,
 961 };
 962 
 963 static int __init
 964 snic_init_module(void)
 965 {
 966         int ret = 0;
 967 
 968 #ifndef __x86_64__
 969         SNIC_INFO("SNIC Driver is supported only for x86_64 platforms!\n");
 970         add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
 971 #endif
 972 
 973         SNIC_INFO("%s, ver %s\n", SNIC_DRV_DESCRIPTION, SNIC_DRV_VERSION);
 974 
 975         ret = snic_global_data_init();
 976         if (ret) {
 977                 SNIC_ERR("Failed to Initialize Global Data.\n");
 978 
 979                 return ret;
 980         }
 981 
 982         ret = pci_register_driver(&snic_driver);
 983         if (ret < 0) {
 984                 SNIC_ERR("PCI driver register error\n");
 985 
 986                 goto err_pci_reg;
 987         }
 988 
 989         return ret;
 990 
 991 err_pci_reg:
 992         snic_global_data_cleanup();
 993 
 994         return ret;
 995 }
 996 
 997 static void __exit
 998 snic_cleanup_module(void)
 999 {
1000         pci_unregister_driver(&snic_driver);
1001         snic_global_data_cleanup();
1002 }
1003 
1004 module_init(snic_init_module);
1005 module_exit(snic_cleanup_module);
1006 
1007 MODULE_LICENSE("GPL v2");
1008 MODULE_DESCRIPTION(SNIC_DRV_DESCRIPTION);
1009 MODULE_VERSION(SNIC_DRV_VERSION);
1010 MODULE_DEVICE_TABLE(pci, snic_id_table);
1011 MODULE_AUTHOR("Narsimhulu Musini <nmusini@cisco.com>, "
1012               "Sesidhar Baddela <sebaddel@cisco.com>");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/scsi/snic/snic_main.c

DEFINITIONS
