1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * zfcp device driver 4 * 5 * Interface to Linux SCSI midlayer. 6 * 7 * Copyright IBM Corp. 2002, 2018 8 */ 9 10 #define KMSG_COMPONENT "zfcp" 11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 12 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/slab.h> 16 #include <scsi/fc/fc_fcp.h> 17 #include <scsi/scsi_eh.h> 18 #include <linux/atomic.h> 19 #include "zfcp_ext.h" 20 #include "zfcp_dbf.h" 21 #include "zfcp_fc.h" 22 #include "zfcp_reqlist.h" 23 24 static unsigned int default_depth = 32; 25 module_param_named(queue_depth, default_depth, uint, 0600); 26 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices"); 27 28 static bool enable_dif; 29 module_param_named(dif, enable_dif, bool, 0400); 30 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support"); 31 32 static bool allow_lun_scan = true; 33 module_param(allow_lun_scan, bool, 0600); 34 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs"); 35 36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev) 37 { 38 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 39 40 /* if previous slave_alloc returned early, there is nothing to do */ 41 if (!zfcp_sdev->port) 42 return; 43 44 zfcp_erp_lun_shutdown_wait(sdev, "scssd_1"); 45 put_device(&zfcp_sdev->port->dev); 46 } 47 48 static int zfcp_scsi_slave_configure(struct scsi_device *sdp) 49 { 50 if (sdp->tagged_supported) 51 scsi_change_queue_depth(sdp, default_depth); 52 return 0; 53 } 54 55 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 56 { 57 set_host_byte(scpnt, result); 58 zfcp_dbf_scsi_fail_send(scpnt); 59 scpnt->scsi_done(scpnt); 60 } 61 62 static 63 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt) 64 { 65 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 66 struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device)); 67 int status, scsi_result, ret; 68 69 /* reset the status for this request */ 70 scpnt->result = 0; 71 scpnt->host_scribble = NULL; 72 73 scsi_result = fc_remote_port_chkready(rport); 74 if (unlikely(scsi_result)) { 75 scpnt->result = scsi_result; 76 zfcp_dbf_scsi_fail_send(scpnt); 77 scpnt->scsi_done(scpnt); 78 return 0; 79 } 80 81 status = atomic_read(&zfcp_sdev->status); 82 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) && 83 !(atomic_read(&zfcp_sdev->port->status) & 84 ZFCP_STATUS_COMMON_ERP_FAILED)) { 85 /* only LUN access denied, but port is good 86 * not covered by FC transport, have to fail here */ 87 zfcp_scsi_command_fail(scpnt, DID_ERROR); 88 return 0; 89 } 90 91 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) { 92 /* This could be 93 * call to rport_delete pending: mimic retry from 94 * fc_remote_port_chkready until rport is BLOCKED 95 */ 96 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY); 97 return 0; 98 } 99 100 ret = zfcp_fsf_fcp_cmnd(scpnt); 101 if (unlikely(ret == -EBUSY)) 102 return SCSI_MLQUEUE_DEVICE_BUSY; 103 else if (unlikely(ret < 0)) 104 return SCSI_MLQUEUE_HOST_BUSY; 105 106 return ret; 107 } 108 109 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev) 110 { 111 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 112 struct zfcp_adapter *adapter = 113 (struct zfcp_adapter *) sdev->host->hostdata[0]; 114 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 115 struct zfcp_port *port; 116 struct zfcp_unit *unit; 117 int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE; 118 119 zfcp_sdev->erp_action.adapter = adapter; 120 zfcp_sdev->erp_action.sdev = sdev; 121 122 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 123 if (!port) 124 return -ENXIO; 125 126 zfcp_sdev->erp_action.port = port; 127 128 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); 129 if (unit) 130 put_device(&unit->dev); 131 132 if (!unit && !(allow_lun_scan && npiv)) { 133 put_device(&port->dev); 134 return -ENXIO; 135 } 136 137 zfcp_sdev->port = port; 138 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; 139 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; 140 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; 141 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; 142 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; 143 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; 144 spin_lock_init(&zfcp_sdev->latencies.lock); 145 146 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); 147 zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); 148 zfcp_erp_wait(port->adapter); 149 150 return 0; 151 } 152 153 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 154 { 155 struct Scsi_Host *scsi_host = scpnt->device->host; 156 struct zfcp_adapter *adapter = 157 (struct zfcp_adapter *) scsi_host->hostdata[0]; 158 struct zfcp_fsf_req *old_req, *abrt_req; 159 unsigned long flags; 160 unsigned long old_reqid = (unsigned long) scpnt->host_scribble; 161 int retval = SUCCESS, ret; 162 int retry = 3; 163 char *dbf_tag; 164 165 /* avoid race condition between late normal completion and abort */ 166 write_lock_irqsave(&adapter->abort_lock, flags); 167 168 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); 169 if (!old_req) { 170 write_unlock_irqrestore(&adapter->abort_lock, flags); 171 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); 172 return FAILED; /* completion could be in progress */ 173 } 174 old_req->data = NULL; 175 176 /* don't access old fsf_req after releasing the abort_lock */ 177 write_unlock_irqrestore(&adapter->abort_lock, flags); 178 179 while (retry--) { 180 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); 181 if (abrt_req) 182 break; 183 184 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL); 185 zfcp_erp_wait(adapter); 186 ret = fc_block_scsi_eh(scpnt); 187 if (ret) { 188 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 189 return ret; 190 } 191 if (!(atomic_read(&adapter->status) & 192 ZFCP_STATUS_COMMON_RUNNING)) { 193 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 194 return SUCCESS; 195 } 196 } 197 if (!abrt_req) { 198 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 199 return FAILED; 200 } 201 202 wait_for_completion(&abrt_req->completion); 203 204 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 205 dbf_tag = "abrt_ok"; 206 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 207 dbf_tag = "abrt_nn"; 208 else { 209 dbf_tag = "abrt_fa"; 210 retval = FAILED; 211 } 212 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 213 zfcp_fsf_req_free(abrt_req); 214 return retval; 215 } 216 217 struct zfcp_scsi_req_filter { 218 u8 tmf_scope; 219 u32 lun_handle; 220 u32 port_handle; 221 }; 222 223 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data) 224 { 225 struct zfcp_scsi_req_filter *filter = 226 (struct zfcp_scsi_req_filter *)data; 227 228 /* already aborted - prevent side-effects - or not a SCSI command */ 229 if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND) 230 return; 231 232 /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */ 233 if (old_req->qtcb->header.port_handle != filter->port_handle) 234 return; 235 236 if (filter->tmf_scope == FCP_TMF_LUN_RESET && 237 old_req->qtcb->header.lun_handle != filter->lun_handle) 238 return; 239 240 zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req); 241 old_req->data = NULL; 242 } 243 244 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags) 245 { 246 struct zfcp_adapter *adapter = zsdev->port->adapter; 247 struct zfcp_scsi_req_filter filter = { 248 .tmf_scope = FCP_TMF_TGT_RESET, 249 .port_handle = zsdev->port->handle, 250 }; 251 unsigned long flags; 252 253 if (tm_flags == FCP_TMF_LUN_RESET) { 254 filter.tmf_scope = FCP_TMF_LUN_RESET; 255 filter.lun_handle = zsdev->lun_handle; 256 } 257 258 /* 259 * abort_lock secures against other processings - in the abort-function 260 * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data 261 */ 262 write_lock_irqsave(&adapter->abort_lock, flags); 263 zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd, 264 &filter); 265 write_unlock_irqrestore(&adapter->abort_lock, flags); 266 } 267 268 /** 269 * zfcp_scsi_task_mgmt_function() - Send a task management function (sync). 270 * @sdev: Pointer to SCSI device to send the task management command to. 271 * @tm_flags: Task management flags, 272 * here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET. 273 */ 274 static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags) 275 { 276 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 277 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 278 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 279 struct zfcp_fsf_req *fsf_req = NULL; 280 int retval = SUCCESS, ret; 281 int retry = 3; 282 283 while (retry--) { 284 fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags); 285 if (fsf_req) 286 break; 287 288 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL); 289 zfcp_erp_wait(adapter); 290 ret = fc_block_rport(rport); 291 if (ret) { 292 zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL); 293 return ret; 294 } 295 296 if (!(atomic_read(&adapter->status) & 297 ZFCP_STATUS_COMMON_RUNNING)) { 298 zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL); 299 return SUCCESS; 300 } 301 } 302 if (!fsf_req) { 303 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL); 304 return FAILED; 305 } 306 307 wait_for_completion(&fsf_req->completion); 308 309 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 310 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req); 311 retval = FAILED; 312 } else { 313 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req); 314 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags); 315 } 316 317 zfcp_fsf_req_free(fsf_req); 318 return retval; 319 } 320 321 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 322 { 323 struct scsi_device *sdev = scpnt->device; 324 325 return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET); 326 } 327 328 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 329 { 330 struct scsi_target *starget = scsi_target(scpnt->device); 331 struct fc_rport *rport = starget_to_rport(starget); 332 struct Scsi_Host *shost = rport_to_shost(rport); 333 struct scsi_device *sdev = NULL, *tmp_sdev; 334 struct zfcp_adapter *adapter = 335 (struct zfcp_adapter *)shost->hostdata[0]; 336 int ret; 337 338 shost_for_each_device(tmp_sdev, shost) { 339 if (tmp_sdev->id == starget->id) { 340 sdev = tmp_sdev; 341 break; 342 } 343 } 344 if (!sdev) { 345 ret = FAILED; 346 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret); 347 return ret; 348 } 349 350 ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET); 351 352 /* release reference from above shost_for_each_device */ 353 if (sdev) 354 scsi_device_put(tmp_sdev); 355 356 return ret; 357 } 358 359 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 360 { 361 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 362 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 363 int ret = SUCCESS, fc_ret; 364 365 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 366 zfcp_erp_wait(adapter); 367 fc_ret = fc_block_scsi_eh(scpnt); 368 if (fc_ret) 369 ret = fc_ret; 370 371 zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret); 372 return ret; 373 } 374 375 /** 376 * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset. 377 * @shost: Pointer to Scsi_Host to perform action on. 378 * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET. 379 * 380 * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise. 381 * 382 * This is similar to zfcp_sysfs_adapter_failed_store(). 383 */ 384 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type) 385 { 386 struct zfcp_adapter *adapter = 387 (struct zfcp_adapter *)shost->hostdata[0]; 388 int ret = 0; 389 390 if (reset_type != SCSI_ADAPTER_RESET) { 391 ret = -EOPNOTSUPP; 392 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret); 393 return ret; 394 } 395 396 zfcp_erp_adapter_reset_sync(adapter, "scshr_y"); 397 return ret; 398 } 399 400 struct scsi_transport_template *zfcp_scsi_transport_template; 401 402 static struct scsi_host_template zfcp_scsi_host_template = { 403 .module = THIS_MODULE, 404 .name = "zfcp", 405 .queuecommand = zfcp_scsi_queuecommand, 406 .eh_timed_out = fc_eh_timed_out, 407 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 408 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 409 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 410 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 411 .slave_alloc = zfcp_scsi_slave_alloc, 412 .slave_configure = zfcp_scsi_slave_configure, 413 .slave_destroy = zfcp_scsi_slave_destroy, 414 .change_queue_depth = scsi_change_queue_depth, 415 .host_reset = zfcp_scsi_sysfs_host_reset, 416 .proc_name = "zfcp", 417 .can_queue = 4096, 418 .this_id = -1, 419 .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 420 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2), 421 /* GCD, adjusted later */ 422 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 423 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8, 424 /* GCD, adjusted later */ 425 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 426 .use_clustering = 1, 427 .shost_attrs = zfcp_sysfs_shost_attrs, 428 .sdev_attrs = zfcp_sysfs_sdev_attrs, 429 .track_queue_depth = 1, 430 .supported_mode = MODE_INITIATOR, 431 }; 432 433 /** 434 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 435 * @adapter: The zfcp adapter to register with the SCSI midlayer 436 */ 437 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 438 { 439 struct ccw_dev_id dev_id; 440 441 if (adapter->scsi_host) 442 return 0; 443 444 ccw_device_get_id(adapter->ccw_device, &dev_id); 445 /* register adapter as SCSI host with mid layer of SCSI stack */ 446 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 447 sizeof (struct zfcp_adapter *)); 448 if (!adapter->scsi_host) { 449 dev_err(&adapter->ccw_device->dev, 450 "Registering the FCP device with the " 451 "SCSI stack failed\n"); 452 return -EIO; 453 } 454 455 /* tell the SCSI stack some characteristics of this adapter */ 456 adapter->scsi_host->max_id = 511; 457 adapter->scsi_host->max_lun = 0xFFFFFFFF; 458 adapter->scsi_host->max_channel = 0; 459 adapter->scsi_host->unique_id = dev_id.devno; 460 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 461 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 462 463 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 464 465 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 466 scsi_host_put(adapter->scsi_host); 467 return -EIO; 468 } 469 470 return 0; 471 } 472 473 /** 474 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 475 * @adapter: The zfcp adapter to unregister. 476 */ 477 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 478 { 479 struct Scsi_Host *shost; 480 struct zfcp_port *port; 481 482 shost = adapter->scsi_host; 483 if (!shost) 484 return; 485 486 read_lock_irq(&adapter->port_list_lock); 487 list_for_each_entry(port, &adapter->port_list, list) 488 port->rport = NULL; 489 read_unlock_irq(&adapter->port_list_lock); 490 491 fc_remove_host(shost); 492 scsi_remove_host(shost); 493 scsi_host_put(shost); 494 adapter->scsi_host = NULL; 495 } 496 497 static struct fc_host_statistics* 498 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter) 499 { 500 struct fc_host_statistics *fc_stats; 501 502 if (!adapter->fc_stats) { 503 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 504 if (!fc_stats) 505 return NULL; 506 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 507 } 508 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 509 return adapter->fc_stats; 510 } 511 512 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 513 struct fsf_qtcb_bottom_port *data, 514 struct fsf_qtcb_bottom_port *old) 515 { 516 fc_stats->seconds_since_last_reset = 517 data->seconds_since_last_reset - old->seconds_since_last_reset; 518 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 519 fc_stats->tx_words = data->tx_words - old->tx_words; 520 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 521 fc_stats->rx_words = data->rx_words - old->rx_words; 522 fc_stats->lip_count = data->lip - old->lip; 523 fc_stats->nos_count = data->nos - old->nos; 524 fc_stats->error_frames = data->error_frames - old->error_frames; 525 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 526 fc_stats->link_failure_count = data->link_failure - old->link_failure; 527 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 528 fc_stats->loss_of_signal_count = 529 data->loss_of_signal - old->loss_of_signal; 530 fc_stats->prim_seq_protocol_err_count = 531 data->psp_error_counts - old->psp_error_counts; 532 fc_stats->invalid_tx_word_count = 533 data->invalid_tx_words - old->invalid_tx_words; 534 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 535 fc_stats->fcp_input_requests = 536 data->input_requests - old->input_requests; 537 fc_stats->fcp_output_requests = 538 data->output_requests - old->output_requests; 539 fc_stats->fcp_control_requests = 540 data->control_requests - old->control_requests; 541 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 542 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 543 } 544 545 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats, 546 struct fsf_qtcb_bottom_port *data) 547 { 548 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 549 fc_stats->tx_frames = data->tx_frames; 550 fc_stats->tx_words = data->tx_words; 551 fc_stats->rx_frames = data->rx_frames; 552 fc_stats->rx_words = data->rx_words; 553 fc_stats->lip_count = data->lip; 554 fc_stats->nos_count = data->nos; 555 fc_stats->error_frames = data->error_frames; 556 fc_stats->dumped_frames = data->dumped_frames; 557 fc_stats->link_failure_count = data->link_failure; 558 fc_stats->loss_of_sync_count = data->loss_of_sync; 559 fc_stats->loss_of_signal_count = data->loss_of_signal; 560 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 561 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 562 fc_stats->invalid_crc_count = data->invalid_crcs; 563 fc_stats->fcp_input_requests = data->input_requests; 564 fc_stats->fcp_output_requests = data->output_requests; 565 fc_stats->fcp_control_requests = data->control_requests; 566 fc_stats->fcp_input_megabytes = data->input_mb; 567 fc_stats->fcp_output_megabytes = data->output_mb; 568 } 569 570 static struct fc_host_statistics * 571 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host) 572 { 573 struct zfcp_adapter *adapter; 574 struct fc_host_statistics *fc_stats; 575 struct fsf_qtcb_bottom_port *data; 576 int ret; 577 578 adapter = (struct zfcp_adapter *)host->hostdata[0]; 579 fc_stats = zfcp_scsi_init_fc_host_stats(adapter); 580 if (!fc_stats) 581 return NULL; 582 583 data = kzalloc(sizeof(*data), GFP_KERNEL); 584 if (!data) 585 return NULL; 586 587 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 588 if (ret) { 589 kfree(data); 590 return NULL; 591 } 592 593 if (adapter->stats_reset && 594 ((jiffies/HZ - adapter->stats_reset) < 595 data->seconds_since_last_reset)) 596 zfcp_scsi_adjust_fc_host_stats(fc_stats, data, 597 adapter->stats_reset_data); 598 else 599 zfcp_scsi_set_fc_host_stats(fc_stats, data); 600 601 kfree(data); 602 return fc_stats; 603 } 604 605 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost) 606 { 607 struct zfcp_adapter *adapter; 608 struct fsf_qtcb_bottom_port *data; 609 int ret; 610 611 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 612 data = kzalloc(sizeof(*data), GFP_KERNEL); 613 if (!data) 614 return; 615 616 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 617 if (ret) 618 kfree(data); 619 else { 620 adapter->stats_reset = jiffies/HZ; 621 kfree(adapter->stats_reset_data); 622 adapter->stats_reset_data = data; /* finally freed in 623 adapter_release */ 624 } 625 } 626 627 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost) 628 { 629 struct zfcp_adapter *adapter = 630 (struct zfcp_adapter *)shost->hostdata[0]; 631 int status = atomic_read(&adapter->status); 632 633 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 634 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 635 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 636 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 637 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 638 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 639 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 640 else 641 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 642 } 643 644 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport, 645 u32 timeout) 646 { 647 rport->dev_loss_tmo = timeout; 648 } 649 650 /** 651 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 652 * @rport: The FC rport where to teminate I/O 653 * 654 * Abort all pending SCSI commands for a port by closing the 655 * port. Using a reopen avoids a conflict with a shutdown 656 * overwriting a reopen. The "forced" ensures that a disappeared port 657 * is not opened again as valid due to the cached plogi data in 658 * non-NPIV mode. 659 */ 660 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 661 { 662 struct zfcp_port *port; 663 struct Scsi_Host *shost = rport_to_shost(rport); 664 struct zfcp_adapter *adapter = 665 (struct zfcp_adapter *)shost->hostdata[0]; 666 667 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 668 669 if (port) { 670 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 671 put_device(&port->dev); 672 } else { 673 zfcp_erp_port_forced_no_port_dbf( 674 "sctrpin", adapter, 675 rport->port_name /* zfcp_scsi_rport_register */, 676 rport->port_id /* zfcp_scsi_rport_register */); 677 } 678 } 679 680 static void zfcp_scsi_rport_register(struct zfcp_port *port) 681 { 682 struct fc_rport_identifiers ids; 683 struct fc_rport *rport; 684 685 if (port->rport) 686 return; 687 688 ids.node_name = port->wwnn; 689 ids.port_name = port->wwpn; 690 ids.port_id = port->d_id; 691 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 692 693 zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL, 694 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD, 695 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD); 696 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 697 if (!rport) { 698 dev_err(&port->adapter->ccw_device->dev, 699 "Registering port 0x%016Lx failed\n", 700 (unsigned long long)port->wwpn); 701 return; 702 } 703 704 rport->maxframe_size = port->maxframe_size; 705 rport->supported_classes = port->supported_classes; 706 port->rport = rport; 707 port->starget_id = rport->scsi_target_id; 708 709 zfcp_unit_queue_scsi_scan(port); 710 } 711 712 static void zfcp_scsi_rport_block(struct zfcp_port *port) 713 { 714 struct fc_rport *rport = port->rport; 715 716 if (rport) { 717 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL, 718 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL, 719 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL); 720 fc_remote_port_delete(rport); 721 port->rport = NULL; 722 } 723 } 724 725 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 726 { 727 get_device(&port->dev); 728 port->rport_task = RPORT_ADD; 729 730 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 731 put_device(&port->dev); 732 } 733 734 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 735 { 736 get_device(&port->dev); 737 port->rport_task = RPORT_DEL; 738 739 if (port->rport && queue_work(port->adapter->work_queue, 740 &port->rport_work)) 741 return; 742 743 put_device(&port->dev); 744 } 745 746 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 747 { 748 unsigned long flags; 749 struct zfcp_port *port; 750 751 read_lock_irqsave(&adapter->port_list_lock, flags); 752 list_for_each_entry(port, &adapter->port_list, list) 753 zfcp_scsi_schedule_rport_block(port); 754 read_unlock_irqrestore(&adapter->port_list_lock, flags); 755 } 756 757 void zfcp_scsi_rport_work(struct work_struct *work) 758 { 759 struct zfcp_port *port = container_of(work, struct zfcp_port, 760 rport_work); 761 762 set_worker_desc("zrp%c-%16llx", 763 (port->rport_task == RPORT_ADD) ? 'a' : 'd', 764 port->wwpn); /* < WORKER_DESC_LEN=24 */ 765 while (port->rport_task) { 766 if (port->rport_task == RPORT_ADD) { 767 port->rport_task = RPORT_NONE; 768 zfcp_scsi_rport_register(port); 769 } else { 770 port->rport_task = RPORT_NONE; 771 zfcp_scsi_rport_block(port); 772 } 773 } 774 775 put_device(&port->dev); 776 } 777 778 /** 779 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 780 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 781 */ 782 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 783 { 784 unsigned int mask = 0; 785 unsigned int data_div; 786 struct Scsi_Host *shost = adapter->scsi_host; 787 788 data_div = atomic_read(&adapter->status) & 789 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 790 791 if (enable_dif && 792 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 793 mask |= SHOST_DIF_TYPE1_PROTECTION; 794 795 if (enable_dif && data_div && 796 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 797 mask |= SHOST_DIX_TYPE1_PROTECTION; 798 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 799 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 800 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 801 shost->max_sectors = shost->sg_tablesize * 8; 802 } 803 804 scsi_host_set_prot(shost, mask); 805 } 806 807 /** 808 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 809 * @scmd: The SCSI command to report the error for 810 * @ascq: The ASCQ to put in the sense buffer 811 * 812 * See the error handling in sd_done for the sense codes used here. 813 * Set DID_SOFT_ERROR to retry the request, if possible. 814 */ 815 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 816 { 817 scsi_build_sense_buffer(1, scmd->sense_buffer, 818 ILLEGAL_REQUEST, 0x10, ascq); 819 set_driver_byte(scmd, DRIVER_SENSE); 820 scmd->result |= SAM_STAT_CHECK_CONDITION; 821 set_host_byte(scmd, DID_SOFT_ERROR); 822 } 823 824 struct fc_function_template zfcp_transport_functions = { 825 .show_starget_port_id = 1, 826 .show_starget_port_name = 1, 827 .show_starget_node_name = 1, 828 .show_rport_supported_classes = 1, 829 .show_rport_maxframe_size = 1, 830 .show_rport_dev_loss_tmo = 1, 831 .show_host_node_name = 1, 832 .show_host_port_name = 1, 833 .show_host_permanent_port_name = 1, 834 .show_host_supported_classes = 1, 835 .show_host_supported_fc4s = 1, 836 .show_host_supported_speeds = 1, 837 .show_host_maxframe_size = 1, 838 .show_host_serial_number = 1, 839 .get_fc_host_stats = zfcp_scsi_get_fc_host_stats, 840 .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats, 841 .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo, 842 .get_host_port_state = zfcp_scsi_get_host_port_state, 843 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 844 .show_host_port_state = 1, 845 .show_host_active_fc4s = 1, 846 .bsg_request = zfcp_fc_exec_bsg_job, 847 .bsg_timeout = zfcp_fc_timeout_bsg_job, 848 /* no functions registered for following dynamic attributes but 849 directly set by LLDD */ 850 .show_host_port_type = 1, 851 .show_host_symbolic_name = 1, 852 .show_host_speed = 1, 853 .show_host_port_id = 1, 854 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 855 }; 856