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 zfcp_sdev->erp_action.adapter = adapter; 119 zfcp_sdev->erp_action.sdev = sdev; 120 121 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 122 if (!port) 123 return -ENXIO; 124 125 zfcp_sdev->erp_action.port = port; 126 127 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); 128 if (unit) 129 put_device(&unit->dev); 130 131 if (!unit && !(allow_lun_scan && npiv)) { 132 put_device(&port->dev); 133 return -ENXIO; 134 } 135 136 zfcp_sdev->port = port; 137 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; 138 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; 139 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; 140 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; 141 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; 142 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; 143 spin_lock_init(&zfcp_sdev->latencies.lock); 144 145 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); 146 zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); 147 zfcp_erp_wait(port->adapter); 148 149 return 0; 150 } 151 152 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 153 { 154 struct Scsi_Host *scsi_host = scpnt->device->host; 155 struct zfcp_adapter *adapter = 156 (struct zfcp_adapter *) scsi_host->hostdata[0]; 157 struct zfcp_fsf_req *old_req, *abrt_req; 158 unsigned long flags; 159 unsigned long old_reqid = (unsigned long) scpnt->host_scribble; 160 int retval = SUCCESS, ret; 161 int retry = 3; 162 char *dbf_tag; 163 164 /* avoid race condition between late normal completion and abort */ 165 write_lock_irqsave(&adapter->abort_lock, flags); 166 167 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); 168 if (!old_req) { 169 write_unlock_irqrestore(&adapter->abort_lock, flags); 170 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); 171 return FAILED; /* completion could be in progress */ 172 } 173 old_req->data = NULL; 174 175 /* don't access old fsf_req after releasing the abort_lock */ 176 write_unlock_irqrestore(&adapter->abort_lock, flags); 177 178 while (retry--) { 179 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); 180 if (abrt_req) 181 break; 182 183 zfcp_erp_wait(adapter); 184 ret = fc_block_scsi_eh(scpnt); 185 if (ret) { 186 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 187 return ret; 188 } 189 if (!(atomic_read(&adapter->status) & 190 ZFCP_STATUS_COMMON_RUNNING)) { 191 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 192 return SUCCESS; 193 } 194 } 195 if (!abrt_req) { 196 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 197 return FAILED; 198 } 199 200 wait_for_completion(&abrt_req->completion); 201 202 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 203 dbf_tag = "abrt_ok"; 204 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 205 dbf_tag = "abrt_nn"; 206 else { 207 dbf_tag = "abrt_fa"; 208 retval = FAILED; 209 } 210 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 211 zfcp_fsf_req_free(abrt_req); 212 return retval; 213 } 214 215 struct zfcp_scsi_req_filter { 216 u8 tmf_scope; 217 u32 lun_handle; 218 u32 port_handle; 219 }; 220 221 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data) 222 { 223 struct zfcp_scsi_req_filter *filter = 224 (struct zfcp_scsi_req_filter *)data; 225 226 /* already aborted - prevent side-effects - or not a SCSI command */ 227 if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND) 228 return; 229 230 /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */ 231 if (old_req->qtcb->header.port_handle != filter->port_handle) 232 return; 233 234 if (filter->tmf_scope == FCP_TMF_LUN_RESET && 235 old_req->qtcb->header.lun_handle != filter->lun_handle) 236 return; 237 238 zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req); 239 old_req->data = NULL; 240 } 241 242 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags) 243 { 244 struct zfcp_adapter *adapter = zsdev->port->adapter; 245 struct zfcp_scsi_req_filter filter = { 246 .tmf_scope = FCP_TMF_TGT_RESET, 247 .port_handle = zsdev->port->handle, 248 }; 249 unsigned long flags; 250 251 if (tm_flags == FCP_TMF_LUN_RESET) { 252 filter.tmf_scope = FCP_TMF_LUN_RESET; 253 filter.lun_handle = zsdev->lun_handle; 254 } 255 256 /* 257 * abort_lock secures against other processings - in the abort-function 258 * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data 259 */ 260 write_lock_irqsave(&adapter->abort_lock, flags); 261 zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd, 262 &filter); 263 write_unlock_irqrestore(&adapter->abort_lock, flags); 264 } 265 266 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags) 267 { 268 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 269 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 270 struct zfcp_fsf_req *fsf_req = NULL; 271 int retval = SUCCESS, ret; 272 int retry = 3; 273 274 while (retry--) { 275 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags); 276 if (fsf_req) 277 break; 278 279 zfcp_erp_wait(adapter); 280 ret = fc_block_scsi_eh(scpnt); 281 if (ret) { 282 zfcp_dbf_scsi_devreset("fiof", scpnt, tm_flags, NULL); 283 return ret; 284 } 285 286 if (!(atomic_read(&adapter->status) & 287 ZFCP_STATUS_COMMON_RUNNING)) { 288 zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags, NULL); 289 return SUCCESS; 290 } 291 } 292 if (!fsf_req) { 293 zfcp_dbf_scsi_devreset("reqf", scpnt, tm_flags, NULL); 294 return FAILED; 295 } 296 297 wait_for_completion(&fsf_req->completion); 298 299 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 300 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags, fsf_req); 301 retval = FAILED; 302 } else { 303 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags, fsf_req); 304 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags); 305 } 306 307 zfcp_fsf_req_free(fsf_req); 308 return retval; 309 } 310 311 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 312 { 313 return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET); 314 } 315 316 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 317 { 318 return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET); 319 } 320 321 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 322 { 323 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 324 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 325 int ret; 326 327 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 328 zfcp_erp_wait(adapter); 329 ret = fc_block_scsi_eh(scpnt); 330 if (ret) 331 return ret; 332 333 return SUCCESS; 334 } 335 336 struct scsi_transport_template *zfcp_scsi_transport_template; 337 338 static struct scsi_host_template zfcp_scsi_host_template = { 339 .module = THIS_MODULE, 340 .name = "zfcp", 341 .queuecommand = zfcp_scsi_queuecommand, 342 .eh_timed_out = fc_eh_timed_out, 343 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 344 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 345 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 346 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 347 .slave_alloc = zfcp_scsi_slave_alloc, 348 .slave_configure = zfcp_scsi_slave_configure, 349 .slave_destroy = zfcp_scsi_slave_destroy, 350 .change_queue_depth = scsi_change_queue_depth, 351 .proc_name = "zfcp", 352 .can_queue = 4096, 353 .this_id = -1, 354 .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 355 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2), 356 /* GCD, adjusted later */ 357 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 358 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8, 359 /* GCD, adjusted later */ 360 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 361 .use_clustering = 1, 362 .shost_attrs = zfcp_sysfs_shost_attrs, 363 .sdev_attrs = zfcp_sysfs_sdev_attrs, 364 .track_queue_depth = 1, 365 }; 366 367 /** 368 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 369 * @adapter: The zfcp adapter to register with the SCSI midlayer 370 */ 371 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 372 { 373 struct ccw_dev_id dev_id; 374 375 if (adapter->scsi_host) 376 return 0; 377 378 ccw_device_get_id(adapter->ccw_device, &dev_id); 379 /* register adapter as SCSI host with mid layer of SCSI stack */ 380 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 381 sizeof (struct zfcp_adapter *)); 382 if (!adapter->scsi_host) { 383 dev_err(&adapter->ccw_device->dev, 384 "Registering the FCP device with the " 385 "SCSI stack failed\n"); 386 return -EIO; 387 } 388 389 /* tell the SCSI stack some characteristics of this adapter */ 390 adapter->scsi_host->max_id = 511; 391 adapter->scsi_host->max_lun = 0xFFFFFFFF; 392 adapter->scsi_host->max_channel = 0; 393 adapter->scsi_host->unique_id = dev_id.devno; 394 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 395 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 396 397 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 398 399 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 400 scsi_host_put(adapter->scsi_host); 401 return -EIO; 402 } 403 404 return 0; 405 } 406 407 /** 408 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 409 * @adapter: The zfcp adapter to unregister. 410 */ 411 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 412 { 413 struct Scsi_Host *shost; 414 struct zfcp_port *port; 415 416 shost = adapter->scsi_host; 417 if (!shost) 418 return; 419 420 read_lock_irq(&adapter->port_list_lock); 421 list_for_each_entry(port, &adapter->port_list, list) 422 port->rport = NULL; 423 read_unlock_irq(&adapter->port_list_lock); 424 425 fc_remove_host(shost); 426 scsi_remove_host(shost); 427 scsi_host_put(shost); 428 adapter->scsi_host = NULL; 429 } 430 431 static struct fc_host_statistics* 432 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter) 433 { 434 struct fc_host_statistics *fc_stats; 435 436 if (!adapter->fc_stats) { 437 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 438 if (!fc_stats) 439 return NULL; 440 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 441 } 442 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 443 return adapter->fc_stats; 444 } 445 446 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 447 struct fsf_qtcb_bottom_port *data, 448 struct fsf_qtcb_bottom_port *old) 449 { 450 fc_stats->seconds_since_last_reset = 451 data->seconds_since_last_reset - old->seconds_since_last_reset; 452 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 453 fc_stats->tx_words = data->tx_words - old->tx_words; 454 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 455 fc_stats->rx_words = data->rx_words - old->rx_words; 456 fc_stats->lip_count = data->lip - old->lip; 457 fc_stats->nos_count = data->nos - old->nos; 458 fc_stats->error_frames = data->error_frames - old->error_frames; 459 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 460 fc_stats->link_failure_count = data->link_failure - old->link_failure; 461 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 462 fc_stats->loss_of_signal_count = 463 data->loss_of_signal - old->loss_of_signal; 464 fc_stats->prim_seq_protocol_err_count = 465 data->psp_error_counts - old->psp_error_counts; 466 fc_stats->invalid_tx_word_count = 467 data->invalid_tx_words - old->invalid_tx_words; 468 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 469 fc_stats->fcp_input_requests = 470 data->input_requests - old->input_requests; 471 fc_stats->fcp_output_requests = 472 data->output_requests - old->output_requests; 473 fc_stats->fcp_control_requests = 474 data->control_requests - old->control_requests; 475 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 476 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 477 } 478 479 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats, 480 struct fsf_qtcb_bottom_port *data) 481 { 482 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 483 fc_stats->tx_frames = data->tx_frames; 484 fc_stats->tx_words = data->tx_words; 485 fc_stats->rx_frames = data->rx_frames; 486 fc_stats->rx_words = data->rx_words; 487 fc_stats->lip_count = data->lip; 488 fc_stats->nos_count = data->nos; 489 fc_stats->error_frames = data->error_frames; 490 fc_stats->dumped_frames = data->dumped_frames; 491 fc_stats->link_failure_count = data->link_failure; 492 fc_stats->loss_of_sync_count = data->loss_of_sync; 493 fc_stats->loss_of_signal_count = data->loss_of_signal; 494 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 495 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 496 fc_stats->invalid_crc_count = data->invalid_crcs; 497 fc_stats->fcp_input_requests = data->input_requests; 498 fc_stats->fcp_output_requests = data->output_requests; 499 fc_stats->fcp_control_requests = data->control_requests; 500 fc_stats->fcp_input_megabytes = data->input_mb; 501 fc_stats->fcp_output_megabytes = data->output_mb; 502 } 503 504 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host) 505 { 506 struct zfcp_adapter *adapter; 507 struct fc_host_statistics *fc_stats; 508 struct fsf_qtcb_bottom_port *data; 509 int ret; 510 511 adapter = (struct zfcp_adapter *)host->hostdata[0]; 512 fc_stats = zfcp_init_fc_host_stats(adapter); 513 if (!fc_stats) 514 return NULL; 515 516 data = kzalloc(sizeof(*data), GFP_KERNEL); 517 if (!data) 518 return NULL; 519 520 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 521 if (ret) { 522 kfree(data); 523 return NULL; 524 } 525 526 if (adapter->stats_reset && 527 ((jiffies/HZ - adapter->stats_reset) < 528 data->seconds_since_last_reset)) 529 zfcp_adjust_fc_host_stats(fc_stats, data, 530 adapter->stats_reset_data); 531 else 532 zfcp_set_fc_host_stats(fc_stats, data); 533 534 kfree(data); 535 return fc_stats; 536 } 537 538 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost) 539 { 540 struct zfcp_adapter *adapter; 541 struct fsf_qtcb_bottom_port *data; 542 int ret; 543 544 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 545 data = kzalloc(sizeof(*data), GFP_KERNEL); 546 if (!data) 547 return; 548 549 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 550 if (ret) 551 kfree(data); 552 else { 553 adapter->stats_reset = jiffies/HZ; 554 kfree(adapter->stats_reset_data); 555 adapter->stats_reset_data = data; /* finally freed in 556 adapter_release */ 557 } 558 } 559 560 static void zfcp_get_host_port_state(struct Scsi_Host *shost) 561 { 562 struct zfcp_adapter *adapter = 563 (struct zfcp_adapter *)shost->hostdata[0]; 564 int status = atomic_read(&adapter->status); 565 566 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 567 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 568 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 569 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 570 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 571 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 572 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 573 else 574 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 575 } 576 577 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout) 578 { 579 rport->dev_loss_tmo = timeout; 580 } 581 582 /** 583 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 584 * @rport: The FC rport where to teminate I/O 585 * 586 * Abort all pending SCSI commands for a port by closing the 587 * port. Using a reopen avoids a conflict with a shutdown 588 * overwriting a reopen. The "forced" ensures that a disappeared port 589 * is not opened again as valid due to the cached plogi data in 590 * non-NPIV mode. 591 */ 592 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 593 { 594 struct zfcp_port *port; 595 struct Scsi_Host *shost = rport_to_shost(rport); 596 struct zfcp_adapter *adapter = 597 (struct zfcp_adapter *)shost->hostdata[0]; 598 599 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 600 601 if (port) { 602 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 603 put_device(&port->dev); 604 } 605 } 606 607 static void zfcp_scsi_rport_register(struct zfcp_port *port) 608 { 609 struct fc_rport_identifiers ids; 610 struct fc_rport *rport; 611 612 if (port->rport) 613 return; 614 615 ids.node_name = port->wwnn; 616 ids.port_name = port->wwpn; 617 ids.port_id = port->d_id; 618 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 619 620 zfcp_dbf_rec_trig("scpaddy", port->adapter, port, NULL, 621 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD, 622 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD); 623 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 624 if (!rport) { 625 dev_err(&port->adapter->ccw_device->dev, 626 "Registering port 0x%016Lx failed\n", 627 (unsigned long long)port->wwpn); 628 return; 629 } 630 631 rport->maxframe_size = port->maxframe_size; 632 rport->supported_classes = port->supported_classes; 633 port->rport = rport; 634 port->starget_id = rport->scsi_target_id; 635 636 zfcp_unit_queue_scsi_scan(port); 637 } 638 639 static void zfcp_scsi_rport_block(struct zfcp_port *port) 640 { 641 struct fc_rport *rport = port->rport; 642 643 if (rport) { 644 zfcp_dbf_rec_trig("scpdely", port->adapter, port, NULL, 645 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL, 646 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL); 647 fc_remote_port_delete(rport); 648 port->rport = NULL; 649 } 650 } 651 652 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 653 { 654 get_device(&port->dev); 655 port->rport_task = RPORT_ADD; 656 657 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 658 put_device(&port->dev); 659 } 660 661 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 662 { 663 get_device(&port->dev); 664 port->rport_task = RPORT_DEL; 665 666 if (port->rport && queue_work(port->adapter->work_queue, 667 &port->rport_work)) 668 return; 669 670 put_device(&port->dev); 671 } 672 673 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 674 { 675 unsigned long flags; 676 struct zfcp_port *port; 677 678 read_lock_irqsave(&adapter->port_list_lock, flags); 679 list_for_each_entry(port, &adapter->port_list, list) 680 zfcp_scsi_schedule_rport_block(port); 681 read_unlock_irqrestore(&adapter->port_list_lock, flags); 682 } 683 684 void zfcp_scsi_rport_work(struct work_struct *work) 685 { 686 struct zfcp_port *port = container_of(work, struct zfcp_port, 687 rport_work); 688 689 while (port->rport_task) { 690 if (port->rport_task == RPORT_ADD) { 691 port->rport_task = RPORT_NONE; 692 zfcp_scsi_rport_register(port); 693 } else { 694 port->rport_task = RPORT_NONE; 695 zfcp_scsi_rport_block(port); 696 } 697 } 698 699 put_device(&port->dev); 700 } 701 702 /** 703 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 704 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 705 */ 706 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 707 { 708 unsigned int mask = 0; 709 unsigned int data_div; 710 struct Scsi_Host *shost = adapter->scsi_host; 711 712 data_div = atomic_read(&adapter->status) & 713 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 714 715 if (enable_dif && 716 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 717 mask |= SHOST_DIF_TYPE1_PROTECTION; 718 719 if (enable_dif && data_div && 720 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 721 mask |= SHOST_DIX_TYPE1_PROTECTION; 722 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 723 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 724 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 725 shost->max_sectors = shost->sg_tablesize * 8; 726 } 727 728 scsi_host_set_prot(shost, mask); 729 } 730 731 /** 732 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 733 * @scmd: The SCSI command to report the error for 734 * @ascq: The ASCQ to put in the sense buffer 735 * 736 * See the error handling in sd_done for the sense codes used here. 737 * Set DID_SOFT_ERROR to retry the request, if possible. 738 */ 739 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 740 { 741 scsi_build_sense_buffer(1, scmd->sense_buffer, 742 ILLEGAL_REQUEST, 0x10, ascq); 743 set_driver_byte(scmd, DRIVER_SENSE); 744 scmd->result |= SAM_STAT_CHECK_CONDITION; 745 set_host_byte(scmd, DID_SOFT_ERROR); 746 } 747 748 struct fc_function_template zfcp_transport_functions = { 749 .show_starget_port_id = 1, 750 .show_starget_port_name = 1, 751 .show_starget_node_name = 1, 752 .show_rport_supported_classes = 1, 753 .show_rport_maxframe_size = 1, 754 .show_rport_dev_loss_tmo = 1, 755 .show_host_node_name = 1, 756 .show_host_port_name = 1, 757 .show_host_permanent_port_name = 1, 758 .show_host_supported_classes = 1, 759 .show_host_supported_fc4s = 1, 760 .show_host_supported_speeds = 1, 761 .show_host_maxframe_size = 1, 762 .show_host_serial_number = 1, 763 .get_fc_host_stats = zfcp_get_fc_host_stats, 764 .reset_fc_host_stats = zfcp_reset_fc_host_stats, 765 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo, 766 .get_host_port_state = zfcp_get_host_port_state, 767 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 768 .show_host_port_state = 1, 769 .show_host_active_fc4s = 1, 770 .bsg_request = zfcp_fc_exec_bsg_job, 771 .bsg_timeout = zfcp_fc_timeout_bsg_job, 772 /* no functions registered for following dynamic attributes but 773 directly set by LLDD */ 774 .show_host_port_type = 1, 775 .show_host_symbolic_name = 1, 776 .show_host_speed = 1, 777 .show_host_port_id = 1, 778 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 779 }; 780