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