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 .use_clustering = 1, 301 .shost_attrs = zfcp_sysfs_shost_attrs, 302 .sdev_attrs = zfcp_sysfs_sdev_attrs, 303 .track_queue_depth = 1, 304 }; 305 306 /** 307 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 308 * @adapter: The zfcp adapter to register with the SCSI midlayer 309 */ 310 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 311 { 312 struct ccw_dev_id dev_id; 313 314 if (adapter->scsi_host) 315 return 0; 316 317 ccw_device_get_id(adapter->ccw_device, &dev_id); 318 /* register adapter as SCSI host with mid layer of SCSI stack */ 319 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 320 sizeof (struct zfcp_adapter *)); 321 if (!adapter->scsi_host) { 322 dev_err(&adapter->ccw_device->dev, 323 "Registering the FCP device with the " 324 "SCSI stack failed\n"); 325 return -EIO; 326 } 327 328 /* tell the SCSI stack some characteristics of this adapter */ 329 adapter->scsi_host->max_id = 511; 330 adapter->scsi_host->max_lun = 0xFFFFFFFF; 331 adapter->scsi_host->max_channel = 0; 332 adapter->scsi_host->unique_id = dev_id.devno; 333 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 334 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 335 336 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 337 338 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 339 scsi_host_put(adapter->scsi_host); 340 return -EIO; 341 } 342 343 return 0; 344 } 345 346 /** 347 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 348 * @adapter: The zfcp adapter to unregister. 349 */ 350 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 351 { 352 struct Scsi_Host *shost; 353 struct zfcp_port *port; 354 355 shost = adapter->scsi_host; 356 if (!shost) 357 return; 358 359 read_lock_irq(&adapter->port_list_lock); 360 list_for_each_entry(port, &adapter->port_list, list) 361 port->rport = NULL; 362 read_unlock_irq(&adapter->port_list_lock); 363 364 fc_remove_host(shost); 365 scsi_remove_host(shost); 366 scsi_host_put(shost); 367 adapter->scsi_host = NULL; 368 } 369 370 static struct fc_host_statistics* 371 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 372 { 373 struct fc_host_statistics *fc_stats; 374 375 if (!adapter->fc_stats) { 376 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 377 if (!fc_stats) 378 return NULL; 379 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 380 } 381 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 382 return adapter->fc_stats; 383 } 384 385 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 386 struct fsf_qtcb_bottom_port *data, 387 struct fsf_qtcb_bottom_port *old) 388 { 389 fc_stats->seconds_since_last_reset = 390 data->seconds_since_last_reset - old->seconds_since_last_reset; 391 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 392 fc_stats->tx_words = data->tx_words - old->tx_words; 393 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 394 fc_stats->rx_words = data->rx_words - old->rx_words; 395 fc_stats->lip_count = data->lip - old->lip; 396 fc_stats->nos_count = data->nos - old->nos; 397 fc_stats->error_frames = data->error_frames - old->error_frames; 398 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 399 fc_stats->link_failure_count = data->link_failure - old->link_failure; 400 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 401 fc_stats->loss_of_signal_count = 402 data->loss_of_signal - old->loss_of_signal; 403 fc_stats->prim_seq_protocol_err_count = 404 data->psp_error_counts - old->psp_error_counts; 405 fc_stats->invalid_tx_word_count = 406 data->invalid_tx_words - old->invalid_tx_words; 407 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 408 fc_stats->fcp_input_requests = 409 data->input_requests - old->input_requests; 410 fc_stats->fcp_output_requests = 411 data->output_requests - old->output_requests; 412 fc_stats->fcp_control_requests = 413 data->control_requests - old->control_requests; 414 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 415 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 416 } 417 418 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 419 struct fsf_qtcb_bottom_port *data) 420 { 421 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 422 fc_stats->tx_frames = data->tx_frames; 423 fc_stats->tx_words = data->tx_words; 424 fc_stats->rx_frames = data->rx_frames; 425 fc_stats->rx_words = data->rx_words; 426 fc_stats->lip_count = data->lip; 427 fc_stats->nos_count = data->nos; 428 fc_stats->error_frames = data->error_frames; 429 fc_stats->dumped_frames = data->dumped_frames; 430 fc_stats->link_failure_count = data->link_failure; 431 fc_stats->loss_of_sync_count = data->loss_of_sync; 432 fc_stats->loss_of_signal_count = data->loss_of_signal; 433 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 434 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 435 fc_stats->invalid_crc_count = data->invalid_crcs; 436 fc_stats->fcp_input_requests = data->input_requests; 437 fc_stats->fcp_output_requests = data->output_requests; 438 fc_stats->fcp_control_requests = data->control_requests; 439 fc_stats->fcp_input_megabytes = data->input_mb; 440 fc_stats->fcp_output_megabytes = data->output_mb; 441 } 442 443 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host) 444 { 445 struct zfcp_adapter *adapter; 446 struct fc_host_statistics *fc_stats; 447 struct fsf_qtcb_bottom_port *data; 448 int ret; 449 450 adapter = (struct zfcp_adapter *)host->hostdata[0]; 451 fc_stats = zfcp_init_fc_host_stats(adapter); 452 if (!fc_stats) 453 return NULL; 454 455 data = kzalloc(sizeof(*data), GFP_KERNEL); 456 if (!data) 457 return NULL; 458 459 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 460 if (ret) { 461 kfree(data); 462 return NULL; 463 } 464 465 if (adapter->stats_reset && 466 ((jiffies/HZ - adapter->stats_reset) < 467 data->seconds_since_last_reset)) 468 zfcp_adjust_fc_host_stats(fc_stats, data, 469 adapter->stats_reset_data); 470 else 471 zfcp_set_fc_host_stats(fc_stats, data); 472 473 kfree(data); 474 return fc_stats; 475 } 476 477 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 478 { 479 struct zfcp_adapter *adapter; 480 struct fsf_qtcb_bottom_port *data; 481 int ret; 482 483 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 484 data = kzalloc(sizeof(*data), GFP_KERNEL); 485 if (!data) 486 return; 487 488 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 489 if (ret) 490 kfree(data); 491 else { 492 adapter->stats_reset = jiffies/HZ; 493 kfree(adapter->stats_reset_data); 494 adapter->stats_reset_data = data; /* finally freed in 495 adapter_release */ 496 } 497 } 498 499 static void zfcp_get_host_port_state(struct Scsi_Host *shost) 500 { 501 struct zfcp_adapter *adapter = 502 (struct zfcp_adapter *)shost->hostdata[0]; 503 int status = atomic_read(&adapter->status); 504 505 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 506 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 507 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 508 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 509 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 510 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 511 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 512 else 513 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 514 } 515 516 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 517 { 518 rport->dev_loss_tmo = timeout; 519 } 520 521 /** 522 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 523 * @rport: The FC rport where to teminate I/O 524 * 525 * Abort all pending SCSI commands for a port by closing the 526 * port. Using a reopen avoids a conflict with a shutdown 527 * overwriting a reopen. The "forced" ensures that a disappeared port 528 * is not opened again as valid due to the cached plogi data in 529 * non-NPIV mode. 530 */ 531 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 532 { 533 struct zfcp_port *port; 534 struct Scsi_Host *shost = rport_to_shost(rport); 535 struct zfcp_adapter *adapter = 536 (struct zfcp_adapter *)shost->hostdata[0]; 537 538 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 539 540 if (port) { 541 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 542 put_device(&port->dev); 543 } 544 } 545 546 static void zfcp_scsi_rport_register(struct zfcp_port *port) 547 { 548 struct fc_rport_identifiers ids; 549 struct fc_rport *rport; 550 551 if (port->rport) 552 return; 553 554 ids.node_name = port->wwnn; 555 ids.port_name = port->wwpn; 556 ids.port_id = port->d_id; 557 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 558 559 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 560 if (!rport) { 561 dev_err(&port->adapter->ccw_device->dev, 562 "Registering port 0x%016Lx failed\n", 563 (unsigned long long)port->wwpn); 564 return; 565 } 566 567 rport->maxframe_size = port->maxframe_size; 568 rport->supported_classes = port->supported_classes; 569 port->rport = rport; 570 port->starget_id = rport->scsi_target_id; 571 572 zfcp_unit_queue_scsi_scan(port); 573 } 574 575 static void zfcp_scsi_rport_block(struct zfcp_port *port) 576 { 577 struct fc_rport *rport = port->rport; 578 579 if (rport) { 580 fc_remote_port_delete(rport); 581 port->rport = NULL; 582 } 583 } 584 585 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 586 { 587 get_device(&port->dev); 588 port->rport_task = RPORT_ADD; 589 590 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 591 put_device(&port->dev); 592 } 593 594 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 595 { 596 get_device(&port->dev); 597 port->rport_task = RPORT_DEL; 598 599 if (port->rport && queue_work(port->adapter->work_queue, 600 &port->rport_work)) 601 return; 602 603 put_device(&port->dev); 604 } 605 606 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 607 { 608 unsigned long flags; 609 struct zfcp_port *port; 610 611 read_lock_irqsave(&adapter->port_list_lock, flags); 612 list_for_each_entry(port, &adapter->port_list, list) 613 zfcp_scsi_schedule_rport_block(port); 614 read_unlock_irqrestore(&adapter->port_list_lock, flags); 615 } 616 617 void zfcp_scsi_rport_work(struct work_struct *work) 618 { 619 struct zfcp_port *port = container_of(work, struct zfcp_port, 620 rport_work); 621 622 while (port->rport_task) { 623 if (port->rport_task == RPORT_ADD) { 624 port->rport_task = RPORT_NONE; 625 zfcp_scsi_rport_register(port); 626 } else { 627 port->rport_task = RPORT_NONE; 628 zfcp_scsi_rport_block(port); 629 } 630 } 631 632 put_device(&port->dev); 633 } 634 635 /** 636 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 637 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 638 */ 639 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 640 { 641 unsigned int mask = 0; 642 unsigned int data_div; 643 struct Scsi_Host *shost = adapter->scsi_host; 644 645 data_div = atomic_read(&adapter->status) & 646 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 647 648 if (enable_dif && 649 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 650 mask |= SHOST_DIF_TYPE1_PROTECTION; 651 652 if (enable_dif && data_div && 653 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 654 mask |= SHOST_DIX_TYPE1_PROTECTION; 655 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 656 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 657 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 658 shost->max_sectors = shost->sg_tablesize * 8; 659 } 660 661 scsi_host_set_prot(shost, mask); 662 } 663 664 /** 665 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 666 * @scmd: The SCSI command to report the error for 667 * @ascq: The ASCQ to put in the sense buffer 668 * 669 * See the error handling in sd_done for the sense codes used here. 670 * Set DID_SOFT_ERROR to retry the request, if possible. 671 */ 672 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 673 { 674 scsi_build_sense_buffer(1, scmd->sense_buffer, 675 ILLEGAL_REQUEST, 0x10, ascq); 676 set_driver_byte(scmd, DRIVER_SENSE); 677 scmd->result |= SAM_STAT_CHECK_CONDITION; 678 set_host_byte(scmd, DID_SOFT_ERROR); 679 } 680 681 struct fc_function_template zfcp_transport_functions = { 682 .show_starget_port_id = 1, 683 .show_starget_port_name = 1, 684 .show_starget_node_name = 1, 685 .show_rport_supported_classes = 1, 686 .show_rport_maxframe_size = 1, 687 .show_rport_dev_loss_tmo = 1, 688 .show_host_node_name = 1, 689 .show_host_port_name = 1, 690 .show_host_permanent_port_name = 1, 691 .show_host_supported_classes = 1, 692 .show_host_supported_fc4s = 1, 693 .show_host_supported_speeds = 1, 694 .show_host_maxframe_size = 1, 695 .show_host_serial_number = 1, 696 .get_fc_host_stats = zfcp_get_fc_host_stats, 697 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 698 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 699 .get_host_port_state = zfcp_get_host_port_state, 700 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 701 .show_host_port_state = 1, 702 .show_host_active_fc4s = 1, 703 .bsg_request = zfcp_fc_exec_bsg_job, 704 .bsg_timeout = zfcp_fc_timeout_bsg_job, 705 /* no functions registered for following dynamic attributes but 706 directly set by LLDD */ 707 .show_host_port_type = 1, 708 .show_host_symbolic_name = 1, 709 .show_host_speed = 1, 710 .show_host_port_id = 1, 711 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 712 }; 713