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/types.h> 13 #include <linux/slab.h> 14 #include <scsi/fc/fc_fcp.h> 15 #include <scsi/scsi_eh.h> 16 #include <linux/atomic.h> 17 #include "zfcp_ext.h" 18 #include "zfcp_dbf.h" 19 #include "zfcp_fc.h" 20 #include "zfcp_reqlist.h" 21 22 static unsigned int default_depth = 32; 23 module_param_named(queue_depth, default_depth, uint, 0600); 24 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices"); 25 26 static bool enable_dif; 27 28 #ifdef CONFIG_ZFCP_DIF 29 module_param_named(dif, enable_dif, bool, 0600); 30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support"); 31 #endif 32 33 static bool allow_lun_scan = 1; 34 module_param(allow_lun_scan, bool, 0600); 35 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs"); 36 37 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth, 38 int reason) 39 { 40 switch (reason) { 41 case SCSI_QDEPTH_DEFAULT: 42 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 43 break; 44 case SCSI_QDEPTH_QFULL: 45 scsi_track_queue_full(sdev, depth); 46 break; 47 case SCSI_QDEPTH_RAMP_UP: 48 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 49 break; 50 default: 51 return -EOPNOTSUPP; 52 } 53 return sdev->queue_depth; 54 } 55 56 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev) 57 { 58 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 59 60 zfcp_erp_lun_shutdown_wait(sdev, "scssd_1"); 61 put_device(&zfcp_sdev->port->dev); 62 } 63 64 static int zfcp_scsi_slave_configure(struct scsi_device *sdp) 65 { 66 if (sdp->tagged_supported) 67 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth); 68 else 69 scsi_adjust_queue_depth(sdp, 0, 1); 70 return 0; 71 } 72 73 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 74 { 75 set_host_byte(scpnt, result); 76 zfcp_dbf_scsi_fail_send(scpnt); 77 scpnt->scsi_done(scpnt); 78 } 79 80 static 81 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt) 82 { 83 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 84 struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device)); 85 int status, scsi_result, ret; 86 87 /* reset the status for this request */ 88 scpnt->result = 0; 89 scpnt->host_scribble = NULL; 90 91 scsi_result = fc_remote_port_chkready(rport); 92 if (unlikely(scsi_result)) { 93 scpnt->result = scsi_result; 94 zfcp_dbf_scsi_fail_send(scpnt); 95 scpnt->scsi_done(scpnt); 96 return 0; 97 } 98 99 status = atomic_read(&zfcp_sdev->status); 100 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) && 101 !(atomic_read(&zfcp_sdev->port->status) & 102 ZFCP_STATUS_COMMON_ERP_FAILED)) { 103 /* only LUN access denied, but port is good 104 * not covered by FC transport, have to fail here */ 105 zfcp_scsi_command_fail(scpnt, DID_ERROR); 106 return 0; 107 } 108 109 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) { 110 /* This could be either 111 * open LUN pending: this is temporary, will result in 112 * open LUN or ERP_FAILED, so retry command 113 * call to rport_delete pending: mimic retry from 114 * fc_remote_port_chkready until rport is BLOCKED 115 */ 116 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY); 117 return 0; 118 } 119 120 ret = zfcp_fsf_fcp_cmnd(scpnt); 121 if (unlikely(ret == -EBUSY)) 122 return SCSI_MLQUEUE_DEVICE_BUSY; 123 else if (unlikely(ret < 0)) 124 return SCSI_MLQUEUE_HOST_BUSY; 125 126 return ret; 127 } 128 129 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev) 130 { 131 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 132 struct zfcp_adapter *adapter = 133 (struct zfcp_adapter *) sdev->host->hostdata[0]; 134 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 135 struct zfcp_port *port; 136 struct zfcp_unit *unit; 137 int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE; 138 139 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 140 if (!port) 141 return -ENXIO; 142 143 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); 144 if (unit) 145 put_device(&unit->dev); 146 147 if (!unit && !(allow_lun_scan && npiv)) { 148 put_device(&port->dev); 149 return -ENXIO; 150 } 151 152 zfcp_sdev->port = port; 153 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; 154 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; 155 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; 156 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; 157 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; 158 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; 159 spin_lock_init(&zfcp_sdev->latencies.lock); 160 161 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); 162 zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); 163 zfcp_erp_wait(port->adapter); 164 165 return 0; 166 } 167 168 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 169 { 170 struct Scsi_Host *scsi_host = scpnt->device->host; 171 struct zfcp_adapter *adapter = 172 (struct zfcp_adapter *) scsi_host->hostdata[0]; 173 struct zfcp_fsf_req *old_req, *abrt_req; 174 unsigned long flags; 175 unsigned long old_reqid = (unsigned long) scpnt->host_scribble; 176 int retval = SUCCESS, ret; 177 int retry = 3; 178 char *dbf_tag; 179 180 /* avoid race condition between late normal completion and abort */ 181 write_lock_irqsave(&adapter->abort_lock, flags); 182 183 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); 184 if (!old_req) { 185 write_unlock_irqrestore(&adapter->abort_lock, flags); 186 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); 187 return FAILED; /* completion could be in progress */ 188 } 189 old_req->data = NULL; 190 191 /* don't access old fsf_req after releasing the abort_lock */ 192 write_unlock_irqrestore(&adapter->abort_lock, flags); 193 194 while (retry--) { 195 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); 196 if (abrt_req) 197 break; 198 199 zfcp_erp_wait(adapter); 200 ret = fc_block_scsi_eh(scpnt); 201 if (ret) { 202 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 203 return ret; 204 } 205 if (!(atomic_read(&adapter->status) & 206 ZFCP_STATUS_COMMON_RUNNING)) { 207 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 208 return SUCCESS; 209 } 210 } 211 if (!abrt_req) { 212 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 213 return FAILED; 214 } 215 216 wait_for_completion(&abrt_req->completion); 217 218 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 219 dbf_tag = "abrt_ok"; 220 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 221 dbf_tag = "abrt_nn"; 222 else { 223 dbf_tag = "abrt_fa"; 224 retval = FAILED; 225 } 226 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 227 zfcp_fsf_req_free(abrt_req); 228 return retval; 229 } 230 231 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags) 232 { 233 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 234 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 235 struct zfcp_fsf_req *fsf_req = NULL; 236 int retval = SUCCESS, ret; 237 int retry = 3; 238 239 while (retry--) { 240 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags); 241 if (fsf_req) 242 break; 243 244 zfcp_erp_wait(adapter); 245 ret = fc_block_scsi_eh(scpnt); 246 if (ret) 247 return ret; 248 249 if (!(atomic_read(&adapter->status) & 250 ZFCP_STATUS_COMMON_RUNNING)) { 251 zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags); 252 return SUCCESS; 253 } 254 } 255 if (!fsf_req) 256 return FAILED; 257 258 wait_for_completion(&fsf_req->completion); 259 260 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 261 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags); 262 retval = FAILED; 263 } else 264 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags); 265 266 zfcp_fsf_req_free(fsf_req); 267 return retval; 268 } 269 270 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 271 { 272 return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET); 273 } 274 275 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 276 { 277 return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET); 278 } 279 280 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 281 { 282 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 283 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 284 int ret; 285 286 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 287 zfcp_erp_wait(adapter); 288 ret = fc_block_scsi_eh(scpnt); 289 if (ret) 290 return ret; 291 292 return SUCCESS; 293 } 294 295 struct scsi_transport_template *zfcp_scsi_transport_template; 296 297 static struct scsi_host_template zfcp_scsi_host_template = { 298 .module = THIS_MODULE, 299 .name = "zfcp", 300 .queuecommand = zfcp_scsi_queuecommand, 301 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 302 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 303 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 304 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 305 .slave_alloc = zfcp_scsi_slave_alloc, 306 .slave_configure = zfcp_scsi_slave_configure, 307 .slave_destroy = zfcp_scsi_slave_destroy, 308 .change_queue_depth = zfcp_scsi_change_queue_depth, 309 .proc_name = "zfcp", 310 .can_queue = 4096, 311 .this_id = -1, 312 .sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ, 313 .max_sectors = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8), 314 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 315 .cmd_per_lun = 1, 316 .use_clustering = 1, 317 .shost_attrs = zfcp_sysfs_shost_attrs, 318 .sdev_attrs = zfcp_sysfs_sdev_attrs, 319 }; 320 321 /** 322 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 323 * @adapter: The zfcp adapter to register with the SCSI midlayer 324 */ 325 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 326 { 327 struct ccw_dev_id dev_id; 328 329 if (adapter->scsi_host) 330 return 0; 331 332 ccw_device_get_id(adapter->ccw_device, &dev_id); 333 /* register adapter as SCSI host with mid layer of SCSI stack */ 334 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 335 sizeof (struct zfcp_adapter *)); 336 if (!adapter->scsi_host) { 337 dev_err(&adapter->ccw_device->dev, 338 "Registering the FCP device with the " 339 "SCSI stack failed\n"); 340 return -EIO; 341 } 342 343 /* tell the SCSI stack some characteristics of this adapter */ 344 adapter->scsi_host->max_id = 511; 345 adapter->scsi_host->max_lun = 0xFFFFFFFF; 346 adapter->scsi_host->max_channel = 0; 347 adapter->scsi_host->unique_id = dev_id.devno; 348 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 349 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 350 351 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 352 353 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 354 scsi_host_put(adapter->scsi_host); 355 return -EIO; 356 } 357 358 return 0; 359 } 360 361 /** 362 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 363 * @adapter: The zfcp adapter to unregister. 364 */ 365 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 366 { 367 struct Scsi_Host *shost; 368 struct zfcp_port *port; 369 370 shost = adapter->scsi_host; 371 if (!shost) 372 return; 373 374 read_lock_irq(&adapter->port_list_lock); 375 list_for_each_entry(port, &adapter->port_list, list) 376 port->rport = NULL; 377 read_unlock_irq(&adapter->port_list_lock); 378 379 fc_remove_host(shost); 380 scsi_remove_host(shost); 381 scsi_host_put(shost); 382 adapter->scsi_host = NULL; 383 } 384 385 static struct fc_host_statistics* 386 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 387 { 388 struct fc_host_statistics *fc_stats; 389 390 if (!adapter->fc_stats) { 391 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 392 if (!fc_stats) 393 return NULL; 394 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 395 } 396 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 397 return adapter->fc_stats; 398 } 399 400 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 401 struct fsf_qtcb_bottom_port *data, 402 struct fsf_qtcb_bottom_port *old) 403 { 404 fc_stats->seconds_since_last_reset = 405 data->seconds_since_last_reset - old->seconds_since_last_reset; 406 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 407 fc_stats->tx_words = data->tx_words - old->tx_words; 408 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 409 fc_stats->rx_words = data->rx_words - old->rx_words; 410 fc_stats->lip_count = data->lip - old->lip; 411 fc_stats->nos_count = data->nos - old->nos; 412 fc_stats->error_frames = data->error_frames - old->error_frames; 413 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 414 fc_stats->link_failure_count = data->link_failure - old->link_failure; 415 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 416 fc_stats->loss_of_signal_count = 417 data->loss_of_signal - old->loss_of_signal; 418 fc_stats->prim_seq_protocol_err_count = 419 data->psp_error_counts - old->psp_error_counts; 420 fc_stats->invalid_tx_word_count = 421 data->invalid_tx_words - old->invalid_tx_words; 422 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 423 fc_stats->fcp_input_requests = 424 data->input_requests - old->input_requests; 425 fc_stats->fcp_output_requests = 426 data->output_requests - old->output_requests; 427 fc_stats->fcp_control_requests = 428 data->control_requests - old->control_requests; 429 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 430 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 431 } 432 433 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 434 struct fsf_qtcb_bottom_port *data) 435 { 436 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 437 fc_stats->tx_frames = data->tx_frames; 438 fc_stats->tx_words = data->tx_words; 439 fc_stats->rx_frames = data->rx_frames; 440 fc_stats->rx_words = data->rx_words; 441 fc_stats->lip_count = data->lip; 442 fc_stats->nos_count = data->nos; 443 fc_stats->error_frames = data->error_frames; 444 fc_stats->dumped_frames = data->dumped_frames; 445 fc_stats->link_failure_count = data->link_failure; 446 fc_stats->loss_of_sync_count = data->loss_of_sync; 447 fc_stats->loss_of_signal_count = data->loss_of_signal; 448 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 449 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 450 fc_stats->invalid_crc_count = data->invalid_crcs; 451 fc_stats->fcp_input_requests = data->input_requests; 452 fc_stats->fcp_output_requests = data->output_requests; 453 fc_stats->fcp_control_requests = data->control_requests; 454 fc_stats->fcp_input_megabytes = data->input_mb; 455 fc_stats->fcp_output_megabytes = data->output_mb; 456 } 457 458 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host) 459 { 460 struct zfcp_adapter *adapter; 461 struct fc_host_statistics *fc_stats; 462 struct fsf_qtcb_bottom_port *data; 463 int ret; 464 465 adapter = (struct zfcp_adapter *)host->hostdata[0]; 466 fc_stats = zfcp_init_fc_host_stats(adapter); 467 if (!fc_stats) 468 return NULL; 469 470 data = kzalloc(sizeof(*data), GFP_KERNEL); 471 if (!data) 472 return NULL; 473 474 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 475 if (ret) { 476 kfree(data); 477 return NULL; 478 } 479 480 if (adapter->stats_reset && 481 ((jiffies/HZ - adapter->stats_reset) < 482 data->seconds_since_last_reset)) 483 zfcp_adjust_fc_host_stats(fc_stats, data, 484 adapter->stats_reset_data); 485 else 486 zfcp_set_fc_host_stats(fc_stats, data); 487 488 kfree(data); 489 return fc_stats; 490 } 491 492 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 493 { 494 struct zfcp_adapter *adapter; 495 struct fsf_qtcb_bottom_port *data; 496 int ret; 497 498 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 499 data = kzalloc(sizeof(*data), GFP_KERNEL); 500 if (!data) 501 return; 502 503 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 504 if (ret) 505 kfree(data); 506 else { 507 adapter->stats_reset = jiffies/HZ; 508 kfree(adapter->stats_reset_data); 509 adapter->stats_reset_data = data; /* finally freed in 510 adapter_release */ 511 } 512 } 513 514 static void zfcp_get_host_port_state(struct Scsi_Host *shost) 515 { 516 struct zfcp_adapter *adapter = 517 (struct zfcp_adapter *)shost->hostdata[0]; 518 int status = atomic_read(&adapter->status); 519 520 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 521 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 522 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 523 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 524 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 525 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 526 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 527 else 528 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 529 } 530 531 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 532 { 533 rport->dev_loss_tmo = timeout; 534 } 535 536 /** 537 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 538 * @rport: The FC rport where to teminate I/O 539 * 540 * Abort all pending SCSI commands for a port by closing the 541 * port. Using a reopen avoids a conflict with a shutdown 542 * overwriting a reopen. The "forced" ensures that a disappeared port 543 * is not opened again as valid due to the cached plogi data in 544 * non-NPIV mode. 545 */ 546 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 547 { 548 struct zfcp_port *port; 549 struct Scsi_Host *shost = rport_to_shost(rport); 550 struct zfcp_adapter *adapter = 551 (struct zfcp_adapter *)shost->hostdata[0]; 552 553 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 554 555 if (port) { 556 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 557 put_device(&port->dev); 558 } 559 } 560 561 static void zfcp_scsi_rport_register(struct zfcp_port *port) 562 { 563 struct fc_rport_identifiers ids; 564 struct fc_rport *rport; 565 566 if (port->rport) 567 return; 568 569 ids.node_name = port->wwnn; 570 ids.port_name = port->wwpn; 571 ids.port_id = port->d_id; 572 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 573 574 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 575 if (!rport) { 576 dev_err(&port->adapter->ccw_device->dev, 577 "Registering port 0x%016Lx failed\n", 578 (unsigned long long)port->wwpn); 579 return; 580 } 581 582 rport->maxframe_size = port->maxframe_size; 583 rport->supported_classes = port->supported_classes; 584 port->rport = rport; 585 port->starget_id = rport->scsi_target_id; 586 587 zfcp_unit_queue_scsi_scan(port); 588 } 589 590 static void zfcp_scsi_rport_block(struct zfcp_port *port) 591 { 592 struct fc_rport *rport = port->rport; 593 594 if (rport) { 595 fc_remote_port_delete(rport); 596 port->rport = NULL; 597 } 598 } 599 600 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 601 { 602 get_device(&port->dev); 603 port->rport_task = RPORT_ADD; 604 605 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 606 put_device(&port->dev); 607 } 608 609 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 610 { 611 get_device(&port->dev); 612 port->rport_task = RPORT_DEL; 613 614 if (port->rport && queue_work(port->adapter->work_queue, 615 &port->rport_work)) 616 return; 617 618 put_device(&port->dev); 619 } 620 621 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 622 { 623 unsigned long flags; 624 struct zfcp_port *port; 625 626 read_lock_irqsave(&adapter->port_list_lock, flags); 627 list_for_each_entry(port, &adapter->port_list, list) 628 zfcp_scsi_schedule_rport_block(port); 629 read_unlock_irqrestore(&adapter->port_list_lock, flags); 630 } 631 632 void zfcp_scsi_rport_work(struct work_struct *work) 633 { 634 struct zfcp_port *port = container_of(work, struct zfcp_port, 635 rport_work); 636 637 while (port->rport_task) { 638 if (port->rport_task == RPORT_ADD) { 639 port->rport_task = RPORT_NONE; 640 zfcp_scsi_rport_register(port); 641 } else { 642 port->rport_task = RPORT_NONE; 643 zfcp_scsi_rport_block(port); 644 } 645 } 646 647 put_device(&port->dev); 648 } 649 650 /** 651 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 652 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 653 */ 654 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 655 { 656 unsigned int mask = 0; 657 unsigned int data_div; 658 struct Scsi_Host *shost = adapter->scsi_host; 659 660 data_div = atomic_read(&adapter->status) & 661 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 662 663 if (enable_dif && 664 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 665 mask |= SHOST_DIF_TYPE1_PROTECTION; 666 667 if (enable_dif && data_div && 668 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 669 mask |= SHOST_DIX_TYPE1_PROTECTION; 670 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 671 shost->sg_prot_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2; 672 shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2; 673 shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2; 674 } 675 676 scsi_host_set_prot(shost, mask); 677 } 678 679 /** 680 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 681 * @scmd: The SCSI command to report the error for 682 * @ascq: The ASCQ to put in the sense buffer 683 * 684 * See the error handling in sd_done for the sense codes used here. 685 * Set DID_SOFT_ERROR to retry the request, if possible. 686 */ 687 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 688 { 689 scsi_build_sense_buffer(1, scmd->sense_buffer, 690 ILLEGAL_REQUEST, 0x10, ascq); 691 set_driver_byte(scmd, DRIVER_SENSE); 692 scmd->result |= SAM_STAT_CHECK_CONDITION; 693 set_host_byte(scmd, DID_SOFT_ERROR); 694 } 695 696 struct fc_function_template zfcp_transport_functions = { 697 .show_starget_port_id = 1, 698 .show_starget_port_name = 1, 699 .show_starget_node_name = 1, 700 .show_rport_supported_classes = 1, 701 .show_rport_maxframe_size = 1, 702 .show_rport_dev_loss_tmo = 1, 703 .show_host_node_name = 1, 704 .show_host_port_name = 1, 705 .show_host_permanent_port_name = 1, 706 .show_host_supported_classes = 1, 707 .show_host_supported_fc4s = 1, 708 .show_host_supported_speeds = 1, 709 .show_host_maxframe_size = 1, 710 .show_host_serial_number = 1, 711 .get_fc_host_stats = zfcp_get_fc_host_stats, 712 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 713 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 714 .get_host_port_state = zfcp_get_host_port_state, 715 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 716 .show_host_port_state = 1, 717 .show_host_active_fc4s = 1, 718 .bsg_request = zfcp_fc_exec_bsg_job, 719 .bsg_timeout = zfcp_fc_timeout_bsg_job, 720 /* no functions registered for following dynamic attributes but 721 directly set by LLDD */ 722 .show_host_port_type = 1, 723 .show_host_symbolic_name = 1, 724 .show_host_speed = 1, 725 .show_host_port_id = 1, 726 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 727 }; 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