1 /* 2 * zfcp device driver 3 * 4 * Interface to Linux SCSI midlayer. 5 * 6 * Copyright IBM Corp. 2002, 2013 7 */ 8 9 #define KMSG_COMPONENT "zfcp" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include <linux/module.h> 13 #include <linux/types.h> 14 #include <linux/slab.h> 15 #include <scsi/fc/fc_fcp.h> 16 #include <scsi/scsi_eh.h> 17 #include <linux/atomic.h> 18 #include "zfcp_ext.h" 19 #include "zfcp_dbf.h" 20 #include "zfcp_fc.h" 21 #include "zfcp_reqlist.h" 22 23 static unsigned int default_depth = 32; 24 module_param_named(queue_depth, default_depth, uint, 0600); 25 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices"); 26 27 static bool enable_dif; 28 module_param_named(dif, enable_dif, bool, 0400); 29 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support"); 30 31 static bool allow_lun_scan = 1; 32 module_param(allow_lun_scan, bool, 0600); 33 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs"); 34 35 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev) 36 { 37 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 38 39 /* if previous slave_alloc returned early, there is nothing to do */ 40 if (!zfcp_sdev->port) 41 return; 42 43 zfcp_erp_lun_shutdown_wait(sdev, "scssd_1"); 44 put_device(&zfcp_sdev->port->dev); 45 } 46 47 static int zfcp_scsi_slave_configure(struct scsi_device *sdp) 48 { 49 if (sdp->tagged_supported) 50 scsi_change_queue_depth(sdp, default_depth); 51 return 0; 52 } 53 54 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 55 { 56 set_host_byte(scpnt, result); 57 zfcp_dbf_scsi_fail_send(scpnt); 58 scpnt->scsi_done(scpnt); 59 } 60 61 static 62 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt) 63 { 64 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 65 struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device)); 66 int status, scsi_result, ret; 67 68 /* reset the status for this request */ 69 scpnt->result = 0; 70 scpnt->host_scribble = NULL; 71 72 scsi_result = fc_remote_port_chkready(rport); 73 if (unlikely(scsi_result)) { 74 scpnt->result = scsi_result; 75 zfcp_dbf_scsi_fail_send(scpnt); 76 scpnt->scsi_done(scpnt); 77 return 0; 78 } 79 80 status = atomic_read(&zfcp_sdev->status); 81 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) && 82 !(atomic_read(&zfcp_sdev->port->status) & 83 ZFCP_STATUS_COMMON_ERP_FAILED)) { 84 /* only LUN access denied, but port is good 85 * not covered by FC transport, have to fail here */ 86 zfcp_scsi_command_fail(scpnt, DID_ERROR); 87 return 0; 88 } 89 90 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) { 91 /* This could be either 92 * open LUN pending: this is temporary, will result in 93 * open LUN or ERP_FAILED, so retry command 94 * call to rport_delete pending: mimic retry from 95 * fc_remote_port_chkready until rport is BLOCKED 96 */ 97 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY); 98 return 0; 99 } 100 101 ret = zfcp_fsf_fcp_cmnd(scpnt); 102 if (unlikely(ret == -EBUSY)) 103 return SCSI_MLQUEUE_DEVICE_BUSY; 104 else if (unlikely(ret < 0)) 105 return SCSI_MLQUEUE_HOST_BUSY; 106 107 return ret; 108 } 109 110 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev) 111 { 112 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 113 struct zfcp_adapter *adapter = 114 (struct zfcp_adapter *) sdev->host->hostdata[0]; 115 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 116 struct zfcp_port *port; 117 struct zfcp_unit *unit; 118 int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE; 119 120 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 121 if (!port) 122 return -ENXIO; 123 124 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); 125 if (unit) 126 put_device(&unit->dev); 127 128 if (!unit && !(allow_lun_scan && npiv)) { 129 put_device(&port->dev); 130 return -ENXIO; 131 } 132 133 zfcp_sdev->port = port; 134 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; 135 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; 136 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; 137 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; 138 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; 139 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; 140 spin_lock_init(&zfcp_sdev->latencies.lock); 141 142 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); 143 zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); 144 zfcp_erp_wait(port->adapter); 145 146 return 0; 147 } 148 149 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 150 { 151 struct Scsi_Host *scsi_host = scpnt->device->host; 152 struct zfcp_adapter *adapter = 153 (struct zfcp_adapter *) scsi_host->hostdata[0]; 154 struct zfcp_fsf_req *old_req, *abrt_req; 155 unsigned long flags; 156 unsigned long old_reqid = (unsigned long) scpnt->host_scribble; 157 int retval = SUCCESS, ret; 158 int retry = 3; 159 char *dbf_tag; 160 161 /* avoid race condition between late normal completion and abort */ 162 write_lock_irqsave(&adapter->abort_lock, flags); 163 164 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); 165 if (!old_req) { 166 write_unlock_irqrestore(&adapter->abort_lock, flags); 167 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); 168 return FAILED; /* completion could be in progress */ 169 } 170 old_req->data = NULL; 171 172 /* don't access old fsf_req after releasing the abort_lock */ 173 write_unlock_irqrestore(&adapter->abort_lock, flags); 174 175 while (retry--) { 176 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); 177 if (abrt_req) 178 break; 179 180 zfcp_erp_wait(adapter); 181 ret = fc_block_scsi_eh(scpnt); 182 if (ret) { 183 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 184 return ret; 185 } 186 if (!(atomic_read(&adapter->status) & 187 ZFCP_STATUS_COMMON_RUNNING)) { 188 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 189 return SUCCESS; 190 } 191 } 192 if (!abrt_req) { 193 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 194 return FAILED; 195 } 196 197 wait_for_completion(&abrt_req->completion); 198 199 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 200 dbf_tag = "abrt_ok"; 201 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 202 dbf_tag = "abrt_nn"; 203 else { 204 dbf_tag = "abrt_fa"; 205 retval = FAILED; 206 } 207 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 208 zfcp_fsf_req_free(abrt_req); 209 return retval; 210 } 211 212 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags) 213 { 214 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 215 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 216 struct zfcp_fsf_req *fsf_req = NULL; 217 int retval = SUCCESS, ret; 218 int retry = 3; 219 220 while (retry--) { 221 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags); 222 if (fsf_req) 223 break; 224 225 zfcp_erp_wait(adapter); 226 ret = fc_block_scsi_eh(scpnt); 227 if (ret) 228 return ret; 229 230 if (!(atomic_read(&adapter->status) & 231 ZFCP_STATUS_COMMON_RUNNING)) { 232 zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags); 233 return SUCCESS; 234 } 235 } 236 if (!fsf_req) 237 return FAILED; 238 239 wait_for_completion(&fsf_req->completion); 240 241 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 242 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags); 243 retval = FAILED; 244 } else 245 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags); 246 247 zfcp_fsf_req_free(fsf_req); 248 return retval; 249 } 250 251 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 252 { 253 return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET); 254 } 255 256 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 257 { 258 return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET); 259 } 260 261 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 262 { 263 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 264 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 265 int ret; 266 267 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 268 zfcp_erp_wait(adapter); 269 ret = fc_block_scsi_eh(scpnt); 270 if (ret) 271 return ret; 272 273 return SUCCESS; 274 } 275 276 struct scsi_transport_template *zfcp_scsi_transport_template; 277 278 static struct scsi_host_template zfcp_scsi_host_template = { 279 .module = THIS_MODULE, 280 .name = "zfcp", 281 .queuecommand = zfcp_scsi_queuecommand, 282 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 283 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 284 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 285 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 286 .slave_alloc = zfcp_scsi_slave_alloc, 287 .slave_configure = zfcp_scsi_slave_configure, 288 .slave_destroy = zfcp_scsi_slave_destroy, 289 .change_queue_depth = scsi_change_queue_depth, 290 .proc_name = "zfcp", 291 .can_queue = 4096, 292 .this_id = -1, 293 .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 294 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2), 295 /* GCD, adjusted later */ 296 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 297 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8, 298 /* GCD, adjusted later */ 299 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 300 .cmd_per_lun = 1, 301 .use_clustering = 1, 302 .shost_attrs = zfcp_sysfs_shost_attrs, 303 .sdev_attrs = zfcp_sysfs_sdev_attrs, 304 .track_queue_depth = 1, 305 }; 306 307 /** 308 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 309 * @adapter: The zfcp adapter to register with the SCSI midlayer 310 */ 311 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 312 { 313 struct ccw_dev_id dev_id; 314 315 if (adapter->scsi_host) 316 return 0; 317 318 ccw_device_get_id(adapter->ccw_device, &dev_id); 319 /* register adapter as SCSI host with mid layer of SCSI stack */ 320 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 321 sizeof (struct zfcp_adapter *)); 322 if (!adapter->scsi_host) { 323 dev_err(&adapter->ccw_device->dev, 324 "Registering the FCP device with the " 325 "SCSI stack failed\n"); 326 return -EIO; 327 } 328 329 /* tell the SCSI stack some characteristics of this adapter */ 330 adapter->scsi_host->max_id = 511; 331 adapter->scsi_host->max_lun = 0xFFFFFFFF; 332 adapter->scsi_host->max_channel = 0; 333 adapter->scsi_host->unique_id = dev_id.devno; 334 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 335 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 336 337 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 338 339 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 340 scsi_host_put(adapter->scsi_host); 341 return -EIO; 342 } 343 344 return 0; 345 } 346 347 /** 348 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 349 * @adapter: The zfcp adapter to unregister. 350 */ 351 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 352 { 353 struct Scsi_Host *shost; 354 struct zfcp_port *port; 355 356 shost = adapter->scsi_host; 357 if (!shost) 358 return; 359 360 read_lock_irq(&adapter->port_list_lock); 361 list_for_each_entry(port, &adapter->port_list, list) 362 port->rport = NULL; 363 read_unlock_irq(&adapter->port_list_lock); 364 365 fc_remove_host(shost); 366 scsi_remove_host(shost); 367 scsi_host_put(shost); 368 adapter->scsi_host = NULL; 369 } 370 371 static struct fc_host_statistics* 372 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 373 { 374 struct fc_host_statistics *fc_stats; 375 376 if (!adapter->fc_stats) { 377 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 378 if (!fc_stats) 379 return NULL; 380 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 381 } 382 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 383 return adapter->fc_stats; 384 } 385 386 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 387 struct fsf_qtcb_bottom_port *data, 388 struct fsf_qtcb_bottom_port *old) 389 { 390 fc_stats->seconds_since_last_reset = 391 data->seconds_since_last_reset - old->seconds_since_last_reset; 392 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 393 fc_stats->tx_words = data->tx_words - old->tx_words; 394 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 395 fc_stats->rx_words = data->rx_words - old->rx_words; 396 fc_stats->lip_count = data->lip - old->lip; 397 fc_stats->nos_count = data->nos - old->nos; 398 fc_stats->error_frames = data->error_frames - old->error_frames; 399 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 400 fc_stats->link_failure_count = data->link_failure - old->link_failure; 401 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 402 fc_stats->loss_of_signal_count = 403 data->loss_of_signal - old->loss_of_signal; 404 fc_stats->prim_seq_protocol_err_count = 405 data->psp_error_counts - old->psp_error_counts; 406 fc_stats->invalid_tx_word_count = 407 data->invalid_tx_words - old->invalid_tx_words; 408 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 409 fc_stats->fcp_input_requests = 410 data->input_requests - old->input_requests; 411 fc_stats->fcp_output_requests = 412 data->output_requests - old->output_requests; 413 fc_stats->fcp_control_requests = 414 data->control_requests - old->control_requests; 415 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 416 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 417 } 418 419 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 420 struct fsf_qtcb_bottom_port *data) 421 { 422 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 423 fc_stats->tx_frames = data->tx_frames; 424 fc_stats->tx_words = data->tx_words; 425 fc_stats->rx_frames = data->rx_frames; 426 fc_stats->rx_words = data->rx_words; 427 fc_stats->lip_count = data->lip; 428 fc_stats->nos_count = data->nos; 429 fc_stats->error_frames = data->error_frames; 430 fc_stats->dumped_frames = data->dumped_frames; 431 fc_stats->link_failure_count = data->link_failure; 432 fc_stats->loss_of_sync_count = data->loss_of_sync; 433 fc_stats->loss_of_signal_count = data->loss_of_signal; 434 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 435 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 436 fc_stats->invalid_crc_count = data->invalid_crcs; 437 fc_stats->fcp_input_requests = data->input_requests; 438 fc_stats->fcp_output_requests = data->output_requests; 439 fc_stats->fcp_control_requests = data->control_requests; 440 fc_stats->fcp_input_megabytes = data->input_mb; 441 fc_stats->fcp_output_megabytes = data->output_mb; 442 } 443 444 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host) 445 { 446 struct zfcp_adapter *adapter; 447 struct fc_host_statistics *fc_stats; 448 struct fsf_qtcb_bottom_port *data; 449 int ret; 450 451 adapter = (struct zfcp_adapter *)host->hostdata[0]; 452 fc_stats = zfcp_init_fc_host_stats(adapter); 453 if (!fc_stats) 454 return NULL; 455 456 data = kzalloc(sizeof(*data), GFP_KERNEL); 457 if (!data) 458 return NULL; 459 460 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 461 if (ret) { 462 kfree(data); 463 return NULL; 464 } 465 466 if (adapter->stats_reset && 467 ((jiffies/HZ - adapter->stats_reset) < 468 data->seconds_since_last_reset)) 469 zfcp_adjust_fc_host_stats(fc_stats, data, 470 adapter->stats_reset_data); 471 else 472 zfcp_set_fc_host_stats(fc_stats, data); 473 474 kfree(data); 475 return fc_stats; 476 } 477 478 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 479 { 480 struct zfcp_adapter *adapter; 481 struct fsf_qtcb_bottom_port *data; 482 int ret; 483 484 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 485 data = kzalloc(sizeof(*data), GFP_KERNEL); 486 if (!data) 487 return; 488 489 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 490 if (ret) 491 kfree(data); 492 else { 493 adapter->stats_reset = jiffies/HZ; 494 kfree(adapter->stats_reset_data); 495 adapter->stats_reset_data = data; /* finally freed in 496 adapter_release */ 497 } 498 } 499 500 static void zfcp_get_host_port_state(struct Scsi_Host *shost) 501 { 502 struct zfcp_adapter *adapter = 503 (struct zfcp_adapter *)shost->hostdata[0]; 504 int status = atomic_read(&adapter->status); 505 506 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 507 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 508 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 509 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 510 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 511 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 512 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 513 else 514 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 515 } 516 517 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 518 { 519 rport->dev_loss_tmo = timeout; 520 } 521 522 /** 523 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 524 * @rport: The FC rport where to teminate I/O 525 * 526 * Abort all pending SCSI commands for a port by closing the 527 * port. Using a reopen avoids a conflict with a shutdown 528 * overwriting a reopen. The "forced" ensures that a disappeared port 529 * is not opened again as valid due to the cached plogi data in 530 * non-NPIV mode. 531 */ 532 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 533 { 534 struct zfcp_port *port; 535 struct Scsi_Host *shost = rport_to_shost(rport); 536 struct zfcp_adapter *adapter = 537 (struct zfcp_adapter *)shost->hostdata[0]; 538 539 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 540 541 if (port) { 542 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 543 put_device(&port->dev); 544 } 545 } 546 547 static void zfcp_scsi_rport_register(struct zfcp_port *port) 548 { 549 struct fc_rport_identifiers ids; 550 struct fc_rport *rport; 551 552 if (port->rport) 553 return; 554 555 ids.node_name = port->wwnn; 556 ids.port_name = port->wwpn; 557 ids.port_id = port->d_id; 558 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 559 560 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 561 if (!rport) { 562 dev_err(&port->adapter->ccw_device->dev, 563 "Registering port 0x%016Lx failed\n", 564 (unsigned long long)port->wwpn); 565 return; 566 } 567 568 rport->maxframe_size = port->maxframe_size; 569 rport->supported_classes = port->supported_classes; 570 port->rport = rport; 571 port->starget_id = rport->scsi_target_id; 572 573 zfcp_unit_queue_scsi_scan(port); 574 } 575 576 static void zfcp_scsi_rport_block(struct zfcp_port *port) 577 { 578 struct fc_rport *rport = port->rport; 579 580 if (rport) { 581 fc_remote_port_delete(rport); 582 port->rport = NULL; 583 } 584 } 585 586 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 587 { 588 get_device(&port->dev); 589 port->rport_task = RPORT_ADD; 590 591 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 592 put_device(&port->dev); 593 } 594 595 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 596 { 597 get_device(&port->dev); 598 port->rport_task = RPORT_DEL; 599 600 if (port->rport && queue_work(port->adapter->work_queue, 601 &port->rport_work)) 602 return; 603 604 put_device(&port->dev); 605 } 606 607 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 608 { 609 unsigned long flags; 610 struct zfcp_port *port; 611 612 read_lock_irqsave(&adapter->port_list_lock, flags); 613 list_for_each_entry(port, &adapter->port_list, list) 614 zfcp_scsi_schedule_rport_block(port); 615 read_unlock_irqrestore(&adapter->port_list_lock, flags); 616 } 617 618 void zfcp_scsi_rport_work(struct work_struct *work) 619 { 620 struct zfcp_port *port = container_of(work, struct zfcp_port, 621 rport_work); 622 623 while (port->rport_task) { 624 if (port->rport_task == RPORT_ADD) { 625 port->rport_task = RPORT_NONE; 626 zfcp_scsi_rport_register(port); 627 } else { 628 port->rport_task = RPORT_NONE; 629 zfcp_scsi_rport_block(port); 630 } 631 } 632 633 put_device(&port->dev); 634 } 635 636 /** 637 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 638 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 639 */ 640 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 641 { 642 unsigned int mask = 0; 643 unsigned int data_div; 644 struct Scsi_Host *shost = adapter->scsi_host; 645 646 data_div = atomic_read(&adapter->status) & 647 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 648 649 if (enable_dif && 650 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 651 mask |= SHOST_DIF_TYPE1_PROTECTION; 652 653 if (enable_dif && data_div && 654 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 655 mask |= SHOST_DIX_TYPE1_PROTECTION; 656 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 657 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 658 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 659 shost->max_sectors = shost->sg_tablesize * 8; 660 } 661 662 scsi_host_set_prot(shost, mask); 663 } 664 665 /** 666 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 667 * @scmd: The SCSI command to report the error for 668 * @ascq: The ASCQ to put in the sense buffer 669 * 670 * See the error handling in sd_done for the sense codes used here. 671 * Set DID_SOFT_ERROR to retry the request, if possible. 672 */ 673 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 674 { 675 scsi_build_sense_buffer(1, scmd->sense_buffer, 676 ILLEGAL_REQUEST, 0x10, ascq); 677 set_driver_byte(scmd, DRIVER_SENSE); 678 scmd->result |= SAM_STAT_CHECK_CONDITION; 679 set_host_byte(scmd, DID_SOFT_ERROR); 680 } 681 682 struct fc_function_template zfcp_transport_functions = { 683 .show_starget_port_id = 1, 684 .show_starget_port_name = 1, 685 .show_starget_node_name = 1, 686 .show_rport_supported_classes = 1, 687 .show_rport_maxframe_size = 1, 688 .show_rport_dev_loss_tmo = 1, 689 .show_host_node_name = 1, 690 .show_host_port_name = 1, 691 .show_host_permanent_port_name = 1, 692 .show_host_supported_classes = 1, 693 .show_host_supported_fc4s = 1, 694 .show_host_supported_speeds = 1, 695 .show_host_maxframe_size = 1, 696 .show_host_serial_number = 1, 697 .get_fc_host_stats = zfcp_get_fc_host_stats, 698 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 699 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 700 .get_host_port_state = zfcp_get_host_port_state, 701 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 702 .show_host_port_state = 1, 703 .show_host_active_fc4s = 1, 704 .bsg_request = zfcp_fc_exec_bsg_job, 705 .bsg_timeout = zfcp_fc_timeout_bsg_job, 706 /* no functions registered for following dynamic attributes but 707 directly set by LLDD */ 708 .show_host_port_type = 1, 709 .show_host_symbolic_name = 1, 710 .show_host_speed = 1, 711 .show_host_port_id = 1, 712 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 713 }; 714