1 /* 2 * zfcp device driver 3 * 4 * Interface to Linux SCSI midlayer. 5 * 6 * Copyright IBM Corporation 2002, 2010 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 int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth, 36 int reason) 37 { 38 switch (reason) { 39 case SCSI_QDEPTH_DEFAULT: 40 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 41 break; 42 case SCSI_QDEPTH_QFULL: 43 scsi_track_queue_full(sdev, depth); 44 break; 45 case SCSI_QDEPTH_RAMP_UP: 46 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 47 break; 48 default: 49 return -EOPNOTSUPP; 50 } 51 return sdev->queue_depth; 52 } 53 54 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev) 55 { 56 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 57 58 /* if previous slave_alloc returned early, there is nothing to do */ 59 if (!zfcp_sdev->port) 60 return; 61 62 zfcp_erp_lun_shutdown_wait(sdev, "scssd_1"); 63 put_device(&zfcp_sdev->port->dev); 64 } 65 66 static int zfcp_scsi_slave_configure(struct scsi_device *sdp) 67 { 68 if (sdp->tagged_supported) 69 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth); 70 else 71 scsi_adjust_queue_depth(sdp, 0, 1); 72 return 0; 73 } 74 75 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 76 { 77 set_host_byte(scpnt, result); 78 zfcp_dbf_scsi_fail_send(scpnt); 79 scpnt->scsi_done(scpnt); 80 } 81 82 static 83 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt) 84 { 85 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 86 struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device)); 87 int status, scsi_result, ret; 88 89 /* reset the status for this request */ 90 scpnt->result = 0; 91 scpnt->host_scribble = NULL; 92 93 scsi_result = fc_remote_port_chkready(rport); 94 if (unlikely(scsi_result)) { 95 scpnt->result = scsi_result; 96 zfcp_dbf_scsi_fail_send(scpnt); 97 scpnt->scsi_done(scpnt); 98 return 0; 99 } 100 101 status = atomic_read(&zfcp_sdev->status); 102 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) && 103 !(atomic_read(&zfcp_sdev->port->status) & 104 ZFCP_STATUS_COMMON_ERP_FAILED)) { 105 /* only LUN access denied, but port is good 106 * not covered by FC transport, have to fail here */ 107 zfcp_scsi_command_fail(scpnt, DID_ERROR); 108 return 0; 109 } 110 111 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) { 112 /* This could be either 113 * open LUN pending: this is temporary, will result in 114 * open LUN or ERP_FAILED, so retry command 115 * call to rport_delete pending: mimic retry from 116 * fc_remote_port_chkready until rport is BLOCKED 117 */ 118 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY); 119 return 0; 120 } 121 122 ret = zfcp_fsf_fcp_cmnd(scpnt); 123 if (unlikely(ret == -EBUSY)) 124 return SCSI_MLQUEUE_DEVICE_BUSY; 125 else if (unlikely(ret < 0)) 126 return SCSI_MLQUEUE_HOST_BUSY; 127 128 return ret; 129 } 130 131 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev) 132 { 133 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 134 struct zfcp_adapter *adapter = 135 (struct zfcp_adapter *) sdev->host->hostdata[0]; 136 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 137 struct zfcp_port *port; 138 struct zfcp_unit *unit; 139 int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE; 140 141 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 142 if (!port) 143 return -ENXIO; 144 145 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); 146 if (unit) 147 put_device(&unit->dev); 148 149 if (!unit && !(allow_lun_scan && npiv)) { 150 put_device(&port->dev); 151 return -ENXIO; 152 } 153 154 zfcp_sdev->port = port; 155 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; 156 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; 157 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; 158 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; 159 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; 160 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; 161 spin_lock_init(&zfcp_sdev->latencies.lock); 162 163 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); 164 zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); 165 zfcp_erp_wait(port->adapter); 166 167 return 0; 168 } 169 170 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 171 { 172 struct Scsi_Host *scsi_host = scpnt->device->host; 173 struct zfcp_adapter *adapter = 174 (struct zfcp_adapter *) scsi_host->hostdata[0]; 175 struct zfcp_fsf_req *old_req, *abrt_req; 176 unsigned long flags; 177 unsigned long old_reqid = (unsigned long) scpnt->host_scribble; 178 int retval = SUCCESS, ret; 179 int retry = 3; 180 char *dbf_tag; 181 182 /* avoid race condition between late normal completion and abort */ 183 write_lock_irqsave(&adapter->abort_lock, flags); 184 185 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); 186 if (!old_req) { 187 write_unlock_irqrestore(&adapter->abort_lock, flags); 188 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); 189 return FAILED; /* completion could be in progress */ 190 } 191 old_req->data = NULL; 192 193 /* don't access old fsf_req after releasing the abort_lock */ 194 write_unlock_irqrestore(&adapter->abort_lock, flags); 195 196 while (retry--) { 197 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); 198 if (abrt_req) 199 break; 200 201 zfcp_erp_wait(adapter); 202 ret = fc_block_scsi_eh(scpnt); 203 if (ret) { 204 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 205 return ret; 206 } 207 if (!(atomic_read(&adapter->status) & 208 ZFCP_STATUS_COMMON_RUNNING)) { 209 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 210 return SUCCESS; 211 } 212 } 213 if (!abrt_req) { 214 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 215 return FAILED; 216 } 217 218 wait_for_completion(&abrt_req->completion); 219 220 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 221 dbf_tag = "abrt_ok"; 222 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 223 dbf_tag = "abrt_nn"; 224 else { 225 dbf_tag = "abrt_fa"; 226 retval = FAILED; 227 } 228 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 229 zfcp_fsf_req_free(abrt_req); 230 return retval; 231 } 232 233 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags) 234 { 235 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 236 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 237 struct zfcp_fsf_req *fsf_req = NULL; 238 int retval = SUCCESS, ret; 239 int retry = 3; 240 241 while (retry--) { 242 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags); 243 if (fsf_req) 244 break; 245 246 zfcp_erp_wait(adapter); 247 ret = fc_block_scsi_eh(scpnt); 248 if (ret) 249 return ret; 250 251 if (!(atomic_read(&adapter->status) & 252 ZFCP_STATUS_COMMON_RUNNING)) { 253 zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags); 254 return SUCCESS; 255 } 256 } 257 if (!fsf_req) 258 return FAILED; 259 260 wait_for_completion(&fsf_req->completion); 261 262 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 263 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags); 264 retval = FAILED; 265 } else 266 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags); 267 268 zfcp_fsf_req_free(fsf_req); 269 return retval; 270 } 271 272 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 273 { 274 return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET); 275 } 276 277 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 278 { 279 return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET); 280 } 281 282 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 283 { 284 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 285 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 286 int ret; 287 288 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 289 zfcp_erp_wait(adapter); 290 ret = fc_block_scsi_eh(scpnt); 291 if (ret) 292 return ret; 293 294 return SUCCESS; 295 } 296 297 struct scsi_transport_template *zfcp_scsi_transport_template; 298 299 static struct scsi_host_template zfcp_scsi_host_template = { 300 .module = THIS_MODULE, 301 .name = "zfcp", 302 .queuecommand = zfcp_scsi_queuecommand, 303 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 304 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 305 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 306 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 307 .slave_alloc = zfcp_scsi_slave_alloc, 308 .slave_configure = zfcp_scsi_slave_configure, 309 .slave_destroy = zfcp_scsi_slave_destroy, 310 .change_queue_depth = zfcp_scsi_change_queue_depth, 311 .proc_name = "zfcp", 312 .can_queue = 4096, 313 .this_id = -1, 314 .sg_tablesize = 1, /* adjusted later */ 315 .max_sectors = 8, /* adjusted later */ 316 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 317 .cmd_per_lun = 1, 318 .use_clustering = 1, 319 .shost_attrs = zfcp_sysfs_shost_attrs, 320 .sdev_attrs = zfcp_sysfs_sdev_attrs, 321 }; 322 323 /** 324 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 325 * @adapter: The zfcp adapter to register with the SCSI midlayer 326 */ 327 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 328 { 329 struct ccw_dev_id dev_id; 330 331 if (adapter->scsi_host) 332 return 0; 333 334 ccw_device_get_id(adapter->ccw_device, &dev_id); 335 /* register adapter as SCSI host with mid layer of SCSI stack */ 336 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 337 sizeof (struct zfcp_adapter *)); 338 if (!adapter->scsi_host) { 339 dev_err(&adapter->ccw_device->dev, 340 "Registering the FCP device with the " 341 "SCSI stack failed\n"); 342 return -EIO; 343 } 344 345 /* tell the SCSI stack some characteristics of this adapter */ 346 adapter->scsi_host->max_id = 511; 347 adapter->scsi_host->max_lun = 0xFFFFFFFF; 348 adapter->scsi_host->max_channel = 0; 349 adapter->scsi_host->unique_id = dev_id.devno; 350 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 351 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 352 353 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 354 355 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 356 scsi_host_put(adapter->scsi_host); 357 return -EIO; 358 } 359 360 return 0; 361 } 362 363 /** 364 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 365 * @adapter: The zfcp adapter to unregister. 366 */ 367 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 368 { 369 struct Scsi_Host *shost; 370 struct zfcp_port *port; 371 372 shost = adapter->scsi_host; 373 if (!shost) 374 return; 375 376 read_lock_irq(&adapter->port_list_lock); 377 list_for_each_entry(port, &adapter->port_list, list) 378 port->rport = NULL; 379 read_unlock_irq(&adapter->port_list_lock); 380 381 fc_remove_host(shost); 382 scsi_remove_host(shost); 383 scsi_host_put(shost); 384 adapter->scsi_host = NULL; 385 } 386 387 static struct fc_host_statistics* 388 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 389 { 390 struct fc_host_statistics *fc_stats; 391 392 if (!adapter->fc_stats) { 393 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 394 if (!fc_stats) 395 return NULL; 396 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 397 } 398 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 399 return adapter->fc_stats; 400 } 401 402 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 403 struct fsf_qtcb_bottom_port *data, 404 struct fsf_qtcb_bottom_port *old) 405 { 406 fc_stats->seconds_since_last_reset = 407 data->seconds_since_last_reset - old->seconds_since_last_reset; 408 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 409 fc_stats->tx_words = data->tx_words - old->tx_words; 410 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 411 fc_stats->rx_words = data->rx_words - old->rx_words; 412 fc_stats->lip_count = data->lip - old->lip; 413 fc_stats->nos_count = data->nos - old->nos; 414 fc_stats->error_frames = data->error_frames - old->error_frames; 415 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 416 fc_stats->link_failure_count = data->link_failure - old->link_failure; 417 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 418 fc_stats->loss_of_signal_count = 419 data->loss_of_signal - old->loss_of_signal; 420 fc_stats->prim_seq_protocol_err_count = 421 data->psp_error_counts - old->psp_error_counts; 422 fc_stats->invalid_tx_word_count = 423 data->invalid_tx_words - old->invalid_tx_words; 424 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 425 fc_stats->fcp_input_requests = 426 data->input_requests - old->input_requests; 427 fc_stats->fcp_output_requests = 428 data->output_requests - old->output_requests; 429 fc_stats->fcp_control_requests = 430 data->control_requests - old->control_requests; 431 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 432 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 433 } 434 435 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 436 struct fsf_qtcb_bottom_port *data) 437 { 438 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 439 fc_stats->tx_frames = data->tx_frames; 440 fc_stats->tx_words = data->tx_words; 441 fc_stats->rx_frames = data->rx_frames; 442 fc_stats->rx_words = data->rx_words; 443 fc_stats->lip_count = data->lip; 444 fc_stats->nos_count = data->nos; 445 fc_stats->error_frames = data->error_frames; 446 fc_stats->dumped_frames = data->dumped_frames; 447 fc_stats->link_failure_count = data->link_failure; 448 fc_stats->loss_of_sync_count = data->loss_of_sync; 449 fc_stats->loss_of_signal_count = data->loss_of_signal; 450 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 451 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 452 fc_stats->invalid_crc_count = data->invalid_crcs; 453 fc_stats->fcp_input_requests = data->input_requests; 454 fc_stats->fcp_output_requests = data->output_requests; 455 fc_stats->fcp_control_requests = data->control_requests; 456 fc_stats->fcp_input_megabytes = data->input_mb; 457 fc_stats->fcp_output_megabytes = data->output_mb; 458 } 459 460 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host) 461 { 462 struct zfcp_adapter *adapter; 463 struct fc_host_statistics *fc_stats; 464 struct fsf_qtcb_bottom_port *data; 465 int ret; 466 467 adapter = (struct zfcp_adapter *)host->hostdata[0]; 468 fc_stats = zfcp_init_fc_host_stats(adapter); 469 if (!fc_stats) 470 return NULL; 471 472 data = kzalloc(sizeof(*data), GFP_KERNEL); 473 if (!data) 474 return NULL; 475 476 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 477 if (ret) { 478 kfree(data); 479 return NULL; 480 } 481 482 if (adapter->stats_reset && 483 ((jiffies/HZ - adapter->stats_reset) < 484 data->seconds_since_last_reset)) 485 zfcp_adjust_fc_host_stats(fc_stats, data, 486 adapter->stats_reset_data); 487 else 488 zfcp_set_fc_host_stats(fc_stats, data); 489 490 kfree(data); 491 return fc_stats; 492 } 493 494 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 495 { 496 struct zfcp_adapter *adapter; 497 struct fsf_qtcb_bottom_port *data; 498 int ret; 499 500 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 501 data = kzalloc(sizeof(*data), GFP_KERNEL); 502 if (!data) 503 return; 504 505 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 506 if (ret) 507 kfree(data); 508 else { 509 adapter->stats_reset = jiffies/HZ; 510 kfree(adapter->stats_reset_data); 511 adapter->stats_reset_data = data; /* finally freed in 512 adapter_release */ 513 } 514 } 515 516 static void zfcp_get_host_port_state(struct Scsi_Host *shost) 517 { 518 struct zfcp_adapter *adapter = 519 (struct zfcp_adapter *)shost->hostdata[0]; 520 int status = atomic_read(&adapter->status); 521 522 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 523 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 524 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 525 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 526 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 527 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 528 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 529 else 530 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 531 } 532 533 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 534 { 535 rport->dev_loss_tmo = timeout; 536 } 537 538 /** 539 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 540 * @rport: The FC rport where to teminate I/O 541 * 542 * Abort all pending SCSI commands for a port by closing the 543 * port. Using a reopen avoids a conflict with a shutdown 544 * overwriting a reopen. The "forced" ensures that a disappeared port 545 * is not opened again as valid due to the cached plogi data in 546 * non-NPIV mode. 547 */ 548 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 549 { 550 struct zfcp_port *port; 551 struct Scsi_Host *shost = rport_to_shost(rport); 552 struct zfcp_adapter *adapter = 553 (struct zfcp_adapter *)shost->hostdata[0]; 554 555 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 556 557 if (port) { 558 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 559 put_device(&port->dev); 560 } 561 } 562 563 static void zfcp_scsi_rport_register(struct zfcp_port *port) 564 { 565 struct fc_rport_identifiers ids; 566 struct fc_rport *rport; 567 568 if (port->rport) 569 return; 570 571 ids.node_name = port->wwnn; 572 ids.port_name = port->wwpn; 573 ids.port_id = port->d_id; 574 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 575 576 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 577 if (!rport) { 578 dev_err(&port->adapter->ccw_device->dev, 579 "Registering port 0x%016Lx failed\n", 580 (unsigned long long)port->wwpn); 581 return; 582 } 583 584 rport->maxframe_size = port->maxframe_size; 585 rport->supported_classes = port->supported_classes; 586 port->rport = rport; 587 port->starget_id = rport->scsi_target_id; 588 589 zfcp_unit_queue_scsi_scan(port); 590 } 591 592 static void zfcp_scsi_rport_block(struct zfcp_port *port) 593 { 594 struct fc_rport *rport = port->rport; 595 596 if (rport) { 597 fc_remote_port_delete(rport); 598 port->rport = NULL; 599 } 600 } 601 602 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 603 { 604 get_device(&port->dev); 605 port->rport_task = RPORT_ADD; 606 607 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 608 put_device(&port->dev); 609 } 610 611 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 612 { 613 get_device(&port->dev); 614 port->rport_task = RPORT_DEL; 615 616 if (port->rport && queue_work(port->adapter->work_queue, 617 &port->rport_work)) 618 return; 619 620 put_device(&port->dev); 621 } 622 623 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 624 { 625 unsigned long flags; 626 struct zfcp_port *port; 627 628 read_lock_irqsave(&adapter->port_list_lock, flags); 629 list_for_each_entry(port, &adapter->port_list, list) 630 zfcp_scsi_schedule_rport_block(port); 631 read_unlock_irqrestore(&adapter->port_list_lock, flags); 632 } 633 634 void zfcp_scsi_rport_work(struct work_struct *work) 635 { 636 struct zfcp_port *port = container_of(work, struct zfcp_port, 637 rport_work); 638 639 while (port->rport_task) { 640 if (port->rport_task == RPORT_ADD) { 641 port->rport_task = RPORT_NONE; 642 zfcp_scsi_rport_register(port); 643 } else { 644 port->rport_task = RPORT_NONE; 645 zfcp_scsi_rport_block(port); 646 } 647 } 648 649 put_device(&port->dev); 650 } 651 652 /** 653 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 654 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 655 */ 656 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 657 { 658 unsigned int mask = 0; 659 unsigned int data_div; 660 struct Scsi_Host *shost = adapter->scsi_host; 661 662 data_div = atomic_read(&adapter->status) & 663 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 664 665 if (enable_dif && 666 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 667 mask |= SHOST_DIF_TYPE1_PROTECTION; 668 669 if (enable_dif && data_div && 670 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 671 mask |= SHOST_DIX_TYPE1_PROTECTION; 672 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 673 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 674 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 675 shost->max_sectors = shost->sg_tablesize * 8; 676 } 677 678 scsi_host_set_prot(shost, mask); 679 } 680 681 /** 682 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 683 * @scmd: The SCSI command to report the error for 684 * @ascq: The ASCQ to put in the sense buffer 685 * 686 * See the error handling in sd_done for the sense codes used here. 687 * Set DID_SOFT_ERROR to retry the request, if possible. 688 */ 689 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 690 { 691 scsi_build_sense_buffer(1, scmd->sense_buffer, 692 ILLEGAL_REQUEST, 0x10, ascq); 693 set_driver_byte(scmd, DRIVER_SENSE); 694 scmd->result |= SAM_STAT_CHECK_CONDITION; 695 set_host_byte(scmd, DID_SOFT_ERROR); 696 } 697 698 struct fc_function_template zfcp_transport_functions = { 699 .show_starget_port_id = 1, 700 .show_starget_port_name = 1, 701 .show_starget_node_name = 1, 702 .show_rport_supported_classes = 1, 703 .show_rport_maxframe_size = 1, 704 .show_rport_dev_loss_tmo = 1, 705 .show_host_node_name = 1, 706 .show_host_port_name = 1, 707 .show_host_permanent_port_name = 1, 708 .show_host_supported_classes = 1, 709 .show_host_supported_fc4s = 1, 710 .show_host_supported_speeds = 1, 711 .show_host_maxframe_size = 1, 712 .show_host_serial_number = 1, 713 .get_fc_host_stats = zfcp_get_fc_host_stats, 714 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 715 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 716 .get_host_port_state = zfcp_get_host_port_state, 717 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 718 .show_host_port_state = 1, 719 .show_host_active_fc4s = 1, 720 .bsg_request = zfcp_fc_exec_bsg_job, 721 .bsg_timeout = zfcp_fc_timeout_bsg_job, 722 /* no functions registered for following dynamic attributes but 723 directly set by LLDD */ 724 .show_host_port_type = 1, 725 .show_host_symbolic_name = 1, 726 .show_host_speed = 1, 727 .show_host_port_id = 1, 728 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 729 }; 730