1 /* 2 * zfcp device driver 3 * 4 * Interface to Linux SCSI midlayer. 5 * 6 * Copyright IBM Corp. 2002, 2017 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 = true; 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 92 * call to rport_delete pending: mimic retry from 93 * fc_remote_port_chkready until rport is BLOCKED 94 */ 95 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY); 96 return 0; 97 } 98 99 ret = zfcp_fsf_fcp_cmnd(scpnt); 100 if (unlikely(ret == -EBUSY)) 101 return SCSI_MLQUEUE_DEVICE_BUSY; 102 else if (unlikely(ret < 0)) 103 return SCSI_MLQUEUE_HOST_BUSY; 104 105 return ret; 106 } 107 108 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev) 109 { 110 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 111 struct zfcp_adapter *adapter = 112 (struct zfcp_adapter *) sdev->host->hostdata[0]; 113 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 114 struct zfcp_port *port; 115 struct zfcp_unit *unit; 116 int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE; 117 118 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 119 if (!port) 120 return -ENXIO; 121 122 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); 123 if (unit) 124 put_device(&unit->dev); 125 126 if (!unit && !(allow_lun_scan && npiv)) { 127 put_device(&port->dev); 128 return -ENXIO; 129 } 130 131 zfcp_sdev->port = port; 132 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; 133 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; 134 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; 135 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; 136 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; 137 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; 138 spin_lock_init(&zfcp_sdev->latencies.lock); 139 140 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); 141 zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); 142 zfcp_erp_wait(port->adapter); 143 144 return 0; 145 } 146 147 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 148 { 149 struct Scsi_Host *scsi_host = scpnt->device->host; 150 struct zfcp_adapter *adapter = 151 (struct zfcp_adapter *) scsi_host->hostdata[0]; 152 struct zfcp_fsf_req *old_req, *abrt_req; 153 unsigned long flags; 154 unsigned long old_reqid = (unsigned long) scpnt->host_scribble; 155 int retval = SUCCESS, ret; 156 int retry = 3; 157 char *dbf_tag; 158 159 /* avoid race condition between late normal completion and abort */ 160 write_lock_irqsave(&adapter->abort_lock, flags); 161 162 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); 163 if (!old_req) { 164 write_unlock_irqrestore(&adapter->abort_lock, flags); 165 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); 166 return FAILED; /* completion could be in progress */ 167 } 168 old_req->data = NULL; 169 170 /* don't access old fsf_req after releasing the abort_lock */ 171 write_unlock_irqrestore(&adapter->abort_lock, flags); 172 173 while (retry--) { 174 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); 175 if (abrt_req) 176 break; 177 178 zfcp_erp_wait(adapter); 179 ret = fc_block_scsi_eh(scpnt); 180 if (ret) { 181 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 182 return ret; 183 } 184 if (!(atomic_read(&adapter->status) & 185 ZFCP_STATUS_COMMON_RUNNING)) { 186 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 187 return SUCCESS; 188 } 189 } 190 if (!abrt_req) { 191 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 192 return FAILED; 193 } 194 195 wait_for_completion(&abrt_req->completion); 196 197 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 198 dbf_tag = "abrt_ok"; 199 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 200 dbf_tag = "abrt_nn"; 201 else { 202 dbf_tag = "abrt_fa"; 203 retval = FAILED; 204 } 205 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 206 zfcp_fsf_req_free(abrt_req); 207 return retval; 208 } 209 210 struct zfcp_scsi_req_filter { 211 u8 tmf_scope; 212 u32 lun_handle; 213 u32 port_handle; 214 }; 215 216 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data) 217 { 218 struct zfcp_scsi_req_filter *filter = 219 (struct zfcp_scsi_req_filter *)data; 220 221 /* already aborted - prevent side-effects - or not a SCSI command */ 222 if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND) 223 return; 224 225 /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */ 226 if (old_req->qtcb->header.port_handle != filter->port_handle) 227 return; 228 229 if (filter->tmf_scope == FCP_TMF_LUN_RESET && 230 old_req->qtcb->header.lun_handle != filter->lun_handle) 231 return; 232 233 zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req); 234 old_req->data = NULL; 235 } 236 237 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags) 238 { 239 struct zfcp_adapter *adapter = zsdev->port->adapter; 240 struct zfcp_scsi_req_filter filter = { 241 .tmf_scope = FCP_TMF_TGT_RESET, 242 .port_handle = zsdev->port->handle, 243 }; 244 unsigned long flags; 245 246 if (tm_flags == FCP_TMF_LUN_RESET) { 247 filter.tmf_scope = FCP_TMF_LUN_RESET; 248 filter.lun_handle = zsdev->lun_handle; 249 } 250 251 /* 252 * abort_lock secures against other processings - in the abort-function 253 * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data 254 */ 255 write_lock_irqsave(&adapter->abort_lock, flags); 256 zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd, 257 &filter); 258 write_unlock_irqrestore(&adapter->abort_lock, flags); 259 } 260 261 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags) 262 { 263 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 264 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 265 struct zfcp_fsf_req *fsf_req = NULL; 266 int retval = SUCCESS, ret; 267 int retry = 3; 268 269 while (retry--) { 270 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags); 271 if (fsf_req) 272 break; 273 274 zfcp_erp_wait(adapter); 275 ret = fc_block_scsi_eh(scpnt); 276 if (ret) { 277 zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL); 278 return ret; 279 } 280 281 if (!(atomic_read(&adapter->status) & 282 ZFCP_STATUS_COMMON_RUNNING)) { 283 zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL); 284 return SUCCESS; 285 } 286 } 287 if (!fsf_req) { 288 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL); 289 return FAILED; 290 } 291 292 wait_for_completion(&fsf_req->completion); 293 294 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 295 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req); 296 retval = FAILED; 297 } else { 298 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req); 299 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags); 300 } 301 302 zfcp_fsf_req_free(fsf_req); 303 return retval; 304 } 305 306 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 307 { 308 return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET); 309 } 310 311 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 312 { 313 return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET); 314 } 315 316 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 317 { 318 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 319 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 320 int ret; 321 322 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 323 zfcp_erp_wait(adapter); 324 ret = fc_block_scsi_eh(scpnt); 325 if (ret) 326 return ret; 327 328 return SUCCESS; 329 } 330 331 struct scsi_transport_template *zfcp_scsi_transport_template; 332 333 static struct scsi_host_template zfcp_scsi_host_template = { 334 .module = THIS_MODULE, 335 .name = "zfcp", 336 .queuecommand = zfcp_scsi_queuecommand, 337 .eh_timed_out = fc_eh_timed_out, 338 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 339 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 340 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 341 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 342 .slave_alloc = zfcp_scsi_slave_alloc, 343 .slave_configure = zfcp_scsi_slave_configure, 344 .slave_destroy = zfcp_scsi_slave_destroy, 345 .change_queue_depth = scsi_change_queue_depth, 346 .proc_name = "zfcp", 347 .can_queue = 4096, 348 .this_id = -1, 349 .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 350 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2), 351 /* GCD, adjusted later */ 352 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 353 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8, 354 /* GCD, adjusted later */ 355 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 356 .use_clustering = 1, 357 .shost_attrs = zfcp_sysfs_shost_attrs, 358 .sdev_attrs = zfcp_sysfs_sdev_attrs, 359 .track_queue_depth = 1, 360 }; 361 362 /** 363 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 364 * @adapter: The zfcp adapter to register with the SCSI midlayer 365 */ 366 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 367 { 368 struct ccw_dev_id dev_id; 369 370 if (adapter->scsi_host) 371 return 0; 372 373 ccw_device_get_id(adapter->ccw_device, &dev_id); 374 /* register adapter as SCSI host with mid layer of SCSI stack */ 375 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 376 sizeof (struct zfcp_adapter *)); 377 if (!adapter->scsi_host) { 378 dev_err(&adapter->ccw_device->dev, 379 "Registering the FCP device with the " 380 "SCSI stack failed\n"); 381 return -EIO; 382 } 383 384 /* tell the SCSI stack some characteristics of this adapter */ 385 adapter->scsi_host->max_id = 511; 386 adapter->scsi_host->max_lun = 0xFFFFFFFF; 387 adapter->scsi_host->max_channel = 0; 388 adapter->scsi_host->unique_id = dev_id.devno; 389 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 390 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 391 392 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 393 394 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 395 scsi_host_put(adapter->scsi_host); 396 return -EIO; 397 } 398 399 return 0; 400 } 401 402 /** 403 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 404 * @adapter: The zfcp adapter to unregister. 405 */ 406 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 407 { 408 struct Scsi_Host *shost; 409 struct zfcp_port *port; 410 411 shost = adapter->scsi_host; 412 if (!shost) 413 return; 414 415 read_lock_irq(&adapter->port_list_lock); 416 list_for_each_entry(port, &adapter->port_list, list) 417 port->rport = NULL; 418 read_unlock_irq(&adapter->port_list_lock); 419 420 fc_remove_host(shost); 421 scsi_remove_host(shost); 422 scsi_host_put(shost); 423 adapter->scsi_host = NULL; 424 } 425 426 static struct fc_host_statistics* 427 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 428 { 429 struct fc_host_statistics *fc_stats; 430 431 if (!adapter->fc_stats) { 432 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 433 if (!fc_stats) 434 return NULL; 435 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 436 } 437 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 438 return adapter->fc_stats; 439 } 440 441 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 442 struct fsf_qtcb_bottom_port *data, 443 struct fsf_qtcb_bottom_port *old) 444 { 445 fc_stats->seconds_since_last_reset = 446 data->seconds_since_last_reset - old->seconds_since_last_reset; 447 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 448 fc_stats->tx_words = data->tx_words - old->tx_words; 449 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 450 fc_stats->rx_words = data->rx_words - old->rx_words; 451 fc_stats->lip_count = data->lip - old->lip; 452 fc_stats->nos_count = data->nos - old->nos; 453 fc_stats->error_frames = data->error_frames - old->error_frames; 454 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 455 fc_stats->link_failure_count = data->link_failure - old->link_failure; 456 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 457 fc_stats->loss_of_signal_count = 458 data->loss_of_signal - old->loss_of_signal; 459 fc_stats->prim_seq_protocol_err_count = 460 data->psp_error_counts - old->psp_error_counts; 461 fc_stats->invalid_tx_word_count = 462 data->invalid_tx_words - old->invalid_tx_words; 463 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 464 fc_stats->fcp_input_requests = 465 data->input_requests - old->input_requests; 466 fc_stats->fcp_output_requests = 467 data->output_requests - old->output_requests; 468 fc_stats->fcp_control_requests = 469 data->control_requests - old->control_requests; 470 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 471 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 472 } 473 474 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 475 struct fsf_qtcb_bottom_port *data) 476 { 477 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 478 fc_stats->tx_frames = data->tx_frames; 479 fc_stats->tx_words = data->tx_words; 480 fc_stats->rx_frames = data->rx_frames; 481 fc_stats->rx_words = data->rx_words; 482 fc_stats->lip_count = data->lip; 483 fc_stats->nos_count = data->nos; 484 fc_stats->error_frames = data->error_frames; 485 fc_stats->dumped_frames = data->dumped_frames; 486 fc_stats->link_failure_count = data->link_failure; 487 fc_stats->loss_of_sync_count = data->loss_of_sync; 488 fc_stats->loss_of_signal_count = data->loss_of_signal; 489 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 490 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 491 fc_stats->invalid_crc_count = data->invalid_crcs; 492 fc_stats->fcp_input_requests = data->input_requests; 493 fc_stats->fcp_output_requests = data->output_requests; 494 fc_stats->fcp_control_requests = data->control_requests; 495 fc_stats->fcp_input_megabytes = data->input_mb; 496 fc_stats->fcp_output_megabytes = data->output_mb; 497 } 498 499 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host) 500 { 501 struct zfcp_adapter *adapter; 502 struct fc_host_statistics *fc_stats; 503 struct fsf_qtcb_bottom_port *data; 504 int ret; 505 506 adapter = (struct zfcp_adapter *)host->hostdata[0]; 507 fc_stats = zfcp_init_fc_host_stats(adapter); 508 if (!fc_stats) 509 return NULL; 510 511 data = kzalloc(sizeof(*data), GFP_KERNEL); 512 if (!data) 513 return NULL; 514 515 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 516 if (ret) { 517 kfree(data); 518 return NULL; 519 } 520 521 if (adapter->stats_reset && 522 ((jiffies/HZ - adapter->stats_reset) < 523 data->seconds_since_last_reset)) 524 zfcp_adjust_fc_host_stats(fc_stats, data, 525 adapter->stats_reset_data); 526 else 527 zfcp_set_fc_host_stats(fc_stats, data); 528 529 kfree(data); 530 return fc_stats; 531 } 532 533 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 534 { 535 struct zfcp_adapter *adapter; 536 struct fsf_qtcb_bottom_port *data; 537 int ret; 538 539 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 540 data = kzalloc(sizeof(*data), GFP_KERNEL); 541 if (!data) 542 return; 543 544 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 545 if (ret) 546 kfree(data); 547 else { 548 adapter->stats_reset = jiffies/HZ; 549 kfree(adapter->stats_reset_data); 550 adapter->stats_reset_data = data; /* finally freed in 551 adapter_release */ 552 } 553 } 554 555 static void zfcp_get_host_port_state(struct Scsi_Host *shost) 556 { 557 struct zfcp_adapter *adapter = 558 (struct zfcp_adapter *)shost->hostdata[0]; 559 int status = atomic_read(&adapter->status); 560 561 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 562 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 563 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 564 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 565 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 566 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 567 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 568 else 569 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 570 } 571 572 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 573 { 574 rport->dev_loss_tmo = timeout; 575 } 576 577 /** 578 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 579 * @rport: The FC rport where to teminate I/O 580 * 581 * Abort all pending SCSI commands for a port by closing the 582 * port. Using a reopen avoids a conflict with a shutdown 583 * overwriting a reopen. The "forced" ensures that a disappeared port 584 * is not opened again as valid due to the cached plogi data in 585 * non-NPIV mode. 586 */ 587 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 588 { 589 struct zfcp_port *port; 590 struct Scsi_Host *shost = rport_to_shost(rport); 591 struct zfcp_adapter *adapter = 592 (struct zfcp_adapter *)shost->hostdata[0]; 593 594 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 595 596 if (port) { 597 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 598 put_device(&port->dev); 599 } 600 } 601 602 static void zfcp_scsi_rport_register(struct zfcp_port *port) 603 { 604 struct fc_rport_identifiers ids; 605 struct fc_rport *rport; 606 607 if (port->rport) 608 return; 609 610 ids.node_name = port->wwnn; 611 ids.port_name = port->wwpn; 612 ids.port_id = port->d_id; 613 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 614 615 zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL, 616 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD, 617 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD); 618 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 619 if (!rport) { 620 dev_err(&port->adapter->ccw_device->dev, 621 "Registering port 0x%016Lx failed\n", 622 (unsigned long long)port->wwpn); 623 return; 624 } 625 626 rport->maxframe_size = port->maxframe_size; 627 rport->supported_classes = port->supported_classes; 628 port->rport = rport; 629 port->starget_id = rport->scsi_target_id; 630 631 zfcp_unit_queue_scsi_scan(port); 632 } 633 634 static void zfcp_scsi_rport_block(struct zfcp_port *port) 635 { 636 struct fc_rport *rport = port->rport; 637 638 if (rport) { 639 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL, 640 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL, 641 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL); 642 fc_remote_port_delete(rport); 643 port->rport = NULL; 644 } 645 } 646 647 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 648 { 649 get_device(&port->dev); 650 port->rport_task = RPORT_ADD; 651 652 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 653 put_device(&port->dev); 654 } 655 656 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 657 { 658 get_device(&port->dev); 659 port->rport_task = RPORT_DEL; 660 661 if (port->rport && queue_work(port->adapter->work_queue, 662 &port->rport_work)) 663 return; 664 665 put_device(&port->dev); 666 } 667 668 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 669 { 670 unsigned long flags; 671 struct zfcp_port *port; 672 673 read_lock_irqsave(&adapter->port_list_lock, flags); 674 list_for_each_entry(port, &adapter->port_list, list) 675 zfcp_scsi_schedule_rport_block(port); 676 read_unlock_irqrestore(&adapter->port_list_lock, flags); 677 } 678 679 void zfcp_scsi_rport_work(struct work_struct *work) 680 { 681 struct zfcp_port *port = container_of(work, struct zfcp_port, 682 rport_work); 683 684 while (port->rport_task) { 685 if (port->rport_task == RPORT_ADD) { 686 port->rport_task = RPORT_NONE; 687 zfcp_scsi_rport_register(port); 688 } else { 689 port->rport_task = RPORT_NONE; 690 zfcp_scsi_rport_block(port); 691 } 692 } 693 694 put_device(&port->dev); 695 } 696 697 /** 698 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 699 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 700 */ 701 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 702 { 703 unsigned int mask = 0; 704 unsigned int data_div; 705 struct Scsi_Host *shost = adapter->scsi_host; 706 707 data_div = atomic_read(&adapter->status) & 708 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 709 710 if (enable_dif && 711 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 712 mask |= SHOST_DIF_TYPE1_PROTECTION; 713 714 if (enable_dif && data_div && 715 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 716 mask |= SHOST_DIX_TYPE1_PROTECTION; 717 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 718 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 719 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 720 shost->max_sectors = shost->sg_tablesize * 8; 721 } 722 723 scsi_host_set_prot(shost, mask); 724 } 725 726 /** 727 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 728 * @scmd: The SCSI command to report the error for 729 * @ascq: The ASCQ to put in the sense buffer 730 * 731 * See the error handling in sd_done for the sense codes used here. 732 * Set DID_SOFT_ERROR to retry the request, if possible. 733 */ 734 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 735 { 736 scsi_build_sense_buffer(1, scmd->sense_buffer, 737 ILLEGAL_REQUEST, 0x10, ascq); 738 set_driver_byte(scmd, DRIVER_SENSE); 739 scmd->result |= SAM_STAT_CHECK_CONDITION; 740 set_host_byte(scmd, DID_SOFT_ERROR); 741 } 742 743 struct fc_function_template zfcp_transport_functions = { 744 .show_starget_port_id = 1, 745 .show_starget_port_name = 1, 746 .show_starget_node_name = 1, 747 .show_rport_supported_classes = 1, 748 .show_rport_maxframe_size = 1, 749 .show_rport_dev_loss_tmo = 1, 750 .show_host_node_name = 1, 751 .show_host_port_name = 1, 752 .show_host_permanent_port_name = 1, 753 .show_host_supported_classes = 1, 754 .show_host_supported_fc4s = 1, 755 .show_host_supported_speeds = 1, 756 .show_host_maxframe_size = 1, 757 .show_host_serial_number = 1, 758 .get_fc_host_stats = zfcp_get_fc_host_stats, 759 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 760 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 761 .get_host_port_state = zfcp_get_host_port_state, 762 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 763 .show_host_port_state = 1, 764 .show_host_active_fc4s = 1, 765 .bsg_request = zfcp_fc_exec_bsg_job, 766 .bsg_timeout = zfcp_fc_timeout_bsg_job, 767 /* no functions registered for following dynamic attributes but 768 directly set by LLDD */ 769 .show_host_port_type = 1, 770 .show_host_symbolic_name = 1, 771 .show_host_speed = 1, 772 .show_host_port_id = 1, 773 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 774 }; 775