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 data integrity support (default off)"); 31 32 bool zfcp_experimental_dix; 33 module_param_named(dix, zfcp_experimental_dix, bool, 0400); 34 MODULE_PARM_DESC(dix, "Enable experimental DIX (data integrity extension) support which implies DIF support (default off)"); 35 36 static bool allow_lun_scan = true; 37 module_param(allow_lun_scan, bool, 0600); 38 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs"); 39 40 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev) 41 { 42 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 43 44 /* if previous slave_alloc returned early, there is nothing to do */ 45 if (!zfcp_sdev->port) 46 return; 47 48 zfcp_erp_lun_shutdown_wait(sdev, "scssd_1"); 49 put_device(&zfcp_sdev->port->dev); 50 } 51 52 static int zfcp_scsi_slave_configure(struct scsi_device *sdp) 53 { 54 if (sdp->tagged_supported) 55 scsi_change_queue_depth(sdp, default_depth); 56 return 0; 57 } 58 59 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result) 60 { 61 set_host_byte(scpnt, result); 62 zfcp_dbf_scsi_fail_send(scpnt); 63 scpnt->scsi_done(scpnt); 64 } 65 66 static 67 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt) 68 { 69 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 70 struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device)); 71 int status, scsi_result, ret; 72 73 /* reset the status for this request */ 74 scpnt->result = 0; 75 scpnt->host_scribble = NULL; 76 77 scsi_result = fc_remote_port_chkready(rport); 78 if (unlikely(scsi_result)) { 79 scpnt->result = scsi_result; 80 zfcp_dbf_scsi_fail_send(scpnt); 81 scpnt->scsi_done(scpnt); 82 return 0; 83 } 84 85 status = atomic_read(&zfcp_sdev->status); 86 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) && 87 !(atomic_read(&zfcp_sdev->port->status) & 88 ZFCP_STATUS_COMMON_ERP_FAILED)) { 89 /* only LUN access denied, but port is good 90 * not covered by FC transport, have to fail here */ 91 zfcp_scsi_command_fail(scpnt, DID_ERROR); 92 return 0; 93 } 94 95 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) { 96 /* This could be 97 * call to rport_delete pending: mimic retry from 98 * fc_remote_port_chkready until rport is BLOCKED 99 */ 100 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY); 101 return 0; 102 } 103 104 ret = zfcp_fsf_fcp_cmnd(scpnt); 105 if (unlikely(ret == -EBUSY)) 106 return SCSI_MLQUEUE_DEVICE_BUSY; 107 else if (unlikely(ret < 0)) 108 return SCSI_MLQUEUE_HOST_BUSY; 109 110 return ret; 111 } 112 113 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev) 114 { 115 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 116 struct zfcp_adapter *adapter = 117 (struct zfcp_adapter *) sdev->host->hostdata[0]; 118 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 119 struct zfcp_port *port; 120 struct zfcp_unit *unit; 121 int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE; 122 123 zfcp_sdev->erp_action.adapter = adapter; 124 zfcp_sdev->erp_action.sdev = sdev; 125 126 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 127 if (!port) 128 return -ENXIO; 129 130 zfcp_sdev->erp_action.port = port; 131 132 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev)); 133 if (unit) 134 put_device(&unit->dev); 135 136 if (!unit && !(allow_lun_scan && npiv)) { 137 put_device(&port->dev); 138 return -ENXIO; 139 } 140 141 zfcp_sdev->port = port; 142 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF; 143 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF; 144 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF; 145 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF; 146 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF; 147 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF; 148 spin_lock_init(&zfcp_sdev->latencies.lock); 149 150 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING); 151 zfcp_erp_lun_reopen(sdev, 0, "scsla_1"); 152 zfcp_erp_wait(port->adapter); 153 154 return 0; 155 } 156 157 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt) 158 { 159 struct Scsi_Host *scsi_host = scpnt->device->host; 160 struct zfcp_adapter *adapter = 161 (struct zfcp_adapter *) scsi_host->hostdata[0]; 162 struct zfcp_fsf_req *old_req, *abrt_req; 163 unsigned long flags; 164 unsigned long old_reqid = (unsigned long) scpnt->host_scribble; 165 int retval = SUCCESS, ret; 166 int retry = 3; 167 char *dbf_tag; 168 169 /* avoid race condition between late normal completion and abort */ 170 write_lock_irqsave(&adapter->abort_lock, flags); 171 172 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid); 173 if (!old_req) { 174 write_unlock_irqrestore(&adapter->abort_lock, flags); 175 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL); 176 return FAILED; /* completion could be in progress */ 177 } 178 old_req->data = NULL; 179 180 /* don't access old fsf_req after releasing the abort_lock */ 181 write_unlock_irqrestore(&adapter->abort_lock, flags); 182 183 while (retry--) { 184 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt); 185 if (abrt_req) 186 break; 187 188 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL); 189 zfcp_erp_wait(adapter); 190 ret = fc_block_scsi_eh(scpnt); 191 if (ret) { 192 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 193 return ret; 194 } 195 if (!(atomic_read(&adapter->status) & 196 ZFCP_STATUS_COMMON_RUNNING)) { 197 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 198 return SUCCESS; 199 } 200 } 201 if (!abrt_req) { 202 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 203 return FAILED; 204 } 205 206 wait_for_completion(&abrt_req->completion); 207 208 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 209 dbf_tag = "abrt_ok"; 210 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 211 dbf_tag = "abrt_nn"; 212 else { 213 dbf_tag = "abrt_fa"; 214 retval = FAILED; 215 } 216 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 217 zfcp_fsf_req_free(abrt_req); 218 return retval; 219 } 220 221 struct zfcp_scsi_req_filter { 222 u8 tmf_scope; 223 u32 lun_handle; 224 u32 port_handle; 225 }; 226 227 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data) 228 { 229 struct zfcp_scsi_req_filter *filter = 230 (struct zfcp_scsi_req_filter *)data; 231 232 /* already aborted - prevent side-effects - or not a SCSI command */ 233 if (old_req->data == NULL || 234 zfcp_fsf_req_is_status_read_buffer(old_req) || 235 old_req->qtcb->header.fsf_command != FSF_QTCB_FCP_CMND) 236 return; 237 238 /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */ 239 if (old_req->qtcb->header.port_handle != filter->port_handle) 240 return; 241 242 if (filter->tmf_scope == FCP_TMF_LUN_RESET && 243 old_req->qtcb->header.lun_handle != filter->lun_handle) 244 return; 245 246 zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req); 247 old_req->data = NULL; 248 } 249 250 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags) 251 { 252 struct zfcp_adapter *adapter = zsdev->port->adapter; 253 struct zfcp_scsi_req_filter filter = { 254 .tmf_scope = FCP_TMF_TGT_RESET, 255 .port_handle = zsdev->port->handle, 256 }; 257 unsigned long flags; 258 259 if (tm_flags == FCP_TMF_LUN_RESET) { 260 filter.tmf_scope = FCP_TMF_LUN_RESET; 261 filter.lun_handle = zsdev->lun_handle; 262 } 263 264 /* 265 * abort_lock secures against other processings - in the abort-function 266 * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data 267 */ 268 write_lock_irqsave(&adapter->abort_lock, flags); 269 zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd, 270 &filter); 271 write_unlock_irqrestore(&adapter->abort_lock, flags); 272 } 273 274 /** 275 * zfcp_scsi_task_mgmt_function() - Send a task management function (sync). 276 * @sdev: Pointer to SCSI device to send the task management command to. 277 * @tm_flags: Task management flags, 278 * here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET. 279 */ 280 static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags) 281 { 282 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 283 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 284 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 285 struct zfcp_fsf_req *fsf_req = NULL; 286 int retval = SUCCESS, ret; 287 int retry = 3; 288 289 while (retry--) { 290 fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags); 291 if (fsf_req) 292 break; 293 294 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL); 295 zfcp_erp_wait(adapter); 296 ret = fc_block_rport(rport); 297 if (ret) { 298 zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL); 299 return ret; 300 } 301 302 if (!(atomic_read(&adapter->status) & 303 ZFCP_STATUS_COMMON_RUNNING)) { 304 zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL); 305 return SUCCESS; 306 } 307 } 308 if (!fsf_req) { 309 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL); 310 return FAILED; 311 } 312 313 wait_for_completion(&fsf_req->completion); 314 315 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 316 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req); 317 retval = FAILED; 318 } else { 319 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req); 320 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags); 321 } 322 323 zfcp_fsf_req_free(fsf_req); 324 return retval; 325 } 326 327 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 328 { 329 struct scsi_device *sdev = scpnt->device; 330 331 return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET); 332 } 333 334 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 335 { 336 struct scsi_target *starget = scsi_target(scpnt->device); 337 struct fc_rport *rport = starget_to_rport(starget); 338 struct Scsi_Host *shost = rport_to_shost(rport); 339 struct scsi_device *sdev = NULL, *tmp_sdev; 340 struct zfcp_adapter *adapter = 341 (struct zfcp_adapter *)shost->hostdata[0]; 342 int ret; 343 344 shost_for_each_device(tmp_sdev, shost) { 345 if (tmp_sdev->id == starget->id) { 346 sdev = tmp_sdev; 347 break; 348 } 349 } 350 if (!sdev) { 351 ret = FAILED; 352 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret); 353 return ret; 354 } 355 356 ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET); 357 358 /* release reference from above shost_for_each_device */ 359 if (sdev) 360 scsi_device_put(tmp_sdev); 361 362 return ret; 363 } 364 365 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 366 { 367 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 368 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 369 int ret = SUCCESS, fc_ret; 370 371 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) { 372 zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p"); 373 zfcp_erp_wait(adapter); 374 } 375 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 376 zfcp_erp_wait(adapter); 377 fc_ret = fc_block_scsi_eh(scpnt); 378 if (fc_ret) 379 ret = fc_ret; 380 381 zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret); 382 return ret; 383 } 384 385 /** 386 * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset. 387 * @shost: Pointer to Scsi_Host to perform action on. 388 * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET. 389 * 390 * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise. 391 * 392 * This is similar to zfcp_sysfs_adapter_failed_store(). 393 */ 394 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type) 395 { 396 struct zfcp_adapter *adapter = 397 (struct zfcp_adapter *)shost->hostdata[0]; 398 int ret = 0; 399 400 if (reset_type != SCSI_ADAPTER_RESET) { 401 ret = -EOPNOTSUPP; 402 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret); 403 return ret; 404 } 405 406 zfcp_erp_adapter_reset_sync(adapter, "scshr_y"); 407 return ret; 408 } 409 410 struct scsi_transport_template *zfcp_scsi_transport_template; 411 412 static struct scsi_host_template zfcp_scsi_host_template = { 413 .module = THIS_MODULE, 414 .name = "zfcp", 415 .queuecommand = zfcp_scsi_queuecommand, 416 .eh_timed_out = fc_eh_timed_out, 417 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 418 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 419 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 420 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 421 .slave_alloc = zfcp_scsi_slave_alloc, 422 .slave_configure = zfcp_scsi_slave_configure, 423 .slave_destroy = zfcp_scsi_slave_destroy, 424 .change_queue_depth = scsi_change_queue_depth, 425 .host_reset = zfcp_scsi_sysfs_host_reset, 426 .proc_name = "zfcp", 427 .can_queue = 4096, 428 .this_id = -1, 429 .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 430 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2), 431 /* GCD, adjusted later */ 432 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 433 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8, 434 /* GCD, adjusted later */ 435 /* report size limit per scatter-gather segment */ 436 .max_segment_size = ZFCP_QDIO_SBALE_LEN, 437 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 438 .shost_attrs = zfcp_sysfs_shost_attrs, 439 .sdev_attrs = zfcp_sysfs_sdev_attrs, 440 .track_queue_depth = 1, 441 .supported_mode = MODE_INITIATOR, 442 }; 443 444 /** 445 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer 446 * @adapter: The zfcp adapter to register with the SCSI midlayer 447 */ 448 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 449 { 450 struct ccw_dev_id dev_id; 451 452 if (adapter->scsi_host) 453 return 0; 454 455 ccw_device_get_id(adapter->ccw_device, &dev_id); 456 /* register adapter as SCSI host with mid layer of SCSI stack */ 457 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 458 sizeof (struct zfcp_adapter *)); 459 if (!adapter->scsi_host) { 460 dev_err(&adapter->ccw_device->dev, 461 "Registering the FCP device with the " 462 "SCSI stack failed\n"); 463 return -EIO; 464 } 465 466 /* tell the SCSI stack some characteristics of this adapter */ 467 adapter->scsi_host->max_id = 511; 468 adapter->scsi_host->max_lun = 0xFFFFFFFF; 469 adapter->scsi_host->max_channel = 0; 470 adapter->scsi_host->unique_id = dev_id.devno; 471 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 472 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 473 474 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 475 476 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 477 scsi_host_put(adapter->scsi_host); 478 return -EIO; 479 } 480 481 return 0; 482 } 483 484 /** 485 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 486 * @adapter: The zfcp adapter to unregister. 487 */ 488 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 489 { 490 struct Scsi_Host *shost; 491 struct zfcp_port *port; 492 493 shost = adapter->scsi_host; 494 if (!shost) 495 return; 496 497 read_lock_irq(&adapter->port_list_lock); 498 list_for_each_entry(port, &adapter->port_list, list) 499 port->rport = NULL; 500 read_unlock_irq(&adapter->port_list_lock); 501 502 fc_remove_host(shost); 503 scsi_remove_host(shost); 504 scsi_host_put(shost); 505 adapter->scsi_host = NULL; 506 } 507 508 static struct fc_host_statistics* 509 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter) 510 { 511 struct fc_host_statistics *fc_stats; 512 513 if (!adapter->fc_stats) { 514 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 515 if (!fc_stats) 516 return NULL; 517 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 518 } 519 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 520 return adapter->fc_stats; 521 } 522 523 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 524 struct fsf_qtcb_bottom_port *data, 525 struct fsf_qtcb_bottom_port *old) 526 { 527 fc_stats->seconds_since_last_reset = 528 data->seconds_since_last_reset - old->seconds_since_last_reset; 529 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 530 fc_stats->tx_words = data->tx_words - old->tx_words; 531 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 532 fc_stats->rx_words = data->rx_words - old->rx_words; 533 fc_stats->lip_count = data->lip - old->lip; 534 fc_stats->nos_count = data->nos - old->nos; 535 fc_stats->error_frames = data->error_frames - old->error_frames; 536 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 537 fc_stats->link_failure_count = data->link_failure - old->link_failure; 538 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 539 fc_stats->loss_of_signal_count = 540 data->loss_of_signal - old->loss_of_signal; 541 fc_stats->prim_seq_protocol_err_count = 542 data->psp_error_counts - old->psp_error_counts; 543 fc_stats->invalid_tx_word_count = 544 data->invalid_tx_words - old->invalid_tx_words; 545 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 546 fc_stats->fcp_input_requests = 547 data->input_requests - old->input_requests; 548 fc_stats->fcp_output_requests = 549 data->output_requests - old->output_requests; 550 fc_stats->fcp_control_requests = 551 data->control_requests - old->control_requests; 552 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 553 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 554 } 555 556 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats, 557 struct fsf_qtcb_bottom_port *data) 558 { 559 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 560 fc_stats->tx_frames = data->tx_frames; 561 fc_stats->tx_words = data->tx_words; 562 fc_stats->rx_frames = data->rx_frames; 563 fc_stats->rx_words = data->rx_words; 564 fc_stats->lip_count = data->lip; 565 fc_stats->nos_count = data->nos; 566 fc_stats->error_frames = data->error_frames; 567 fc_stats->dumped_frames = data->dumped_frames; 568 fc_stats->link_failure_count = data->link_failure; 569 fc_stats->loss_of_sync_count = data->loss_of_sync; 570 fc_stats->loss_of_signal_count = data->loss_of_signal; 571 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 572 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 573 fc_stats->invalid_crc_count = data->invalid_crcs; 574 fc_stats->fcp_input_requests = data->input_requests; 575 fc_stats->fcp_output_requests = data->output_requests; 576 fc_stats->fcp_control_requests = data->control_requests; 577 fc_stats->fcp_input_megabytes = data->input_mb; 578 fc_stats->fcp_output_megabytes = data->output_mb; 579 } 580 581 static struct fc_host_statistics * 582 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host) 583 { 584 struct zfcp_adapter *adapter; 585 struct fc_host_statistics *fc_stats; 586 struct fsf_qtcb_bottom_port *data; 587 int ret; 588 589 adapter = (struct zfcp_adapter *)host->hostdata[0]; 590 fc_stats = zfcp_scsi_init_fc_host_stats(adapter); 591 if (!fc_stats) 592 return NULL; 593 594 data = kzalloc(sizeof(*data), GFP_KERNEL); 595 if (!data) 596 return NULL; 597 598 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 599 if (ret) { 600 kfree(data); 601 return NULL; 602 } 603 604 if (adapter->stats_reset && 605 ((jiffies/HZ - adapter->stats_reset) < 606 data->seconds_since_last_reset)) 607 zfcp_scsi_adjust_fc_host_stats(fc_stats, data, 608 adapter->stats_reset_data); 609 else 610 zfcp_scsi_set_fc_host_stats(fc_stats, data); 611 612 kfree(data); 613 return fc_stats; 614 } 615 616 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost) 617 { 618 struct zfcp_adapter *adapter; 619 struct fsf_qtcb_bottom_port *data; 620 int ret; 621 622 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 623 data = kzalloc(sizeof(*data), GFP_KERNEL); 624 if (!data) 625 return; 626 627 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 628 if (ret) 629 kfree(data); 630 else { 631 adapter->stats_reset = jiffies/HZ; 632 kfree(adapter->stats_reset_data); 633 adapter->stats_reset_data = data; /* finally freed in 634 adapter_release */ 635 } 636 } 637 638 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost) 639 { 640 struct zfcp_adapter *adapter = 641 (struct zfcp_adapter *)shost->hostdata[0]; 642 int status = atomic_read(&adapter->status); 643 644 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 645 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 646 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 647 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 648 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 649 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 650 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 651 else 652 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 653 } 654 655 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport, 656 u32 timeout) 657 { 658 rport->dev_loss_tmo = timeout; 659 } 660 661 /** 662 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 663 * @rport: The FC rport where to teminate I/O 664 * 665 * Abort all pending SCSI commands for a port by closing the 666 * port. Using a reopen avoids a conflict with a shutdown 667 * overwriting a reopen. The "forced" ensures that a disappeared port 668 * is not opened again as valid due to the cached plogi data in 669 * non-NPIV mode. 670 */ 671 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 672 { 673 struct zfcp_port *port; 674 struct Scsi_Host *shost = rport_to_shost(rport); 675 struct zfcp_adapter *adapter = 676 (struct zfcp_adapter *)shost->hostdata[0]; 677 678 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 679 680 if (port) { 681 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 682 put_device(&port->dev); 683 } else { 684 zfcp_erp_port_forced_no_port_dbf( 685 "sctrpin", adapter, 686 rport->port_name /* zfcp_scsi_rport_register */, 687 rport->port_id /* zfcp_scsi_rport_register */); 688 } 689 } 690 691 static void zfcp_scsi_rport_register(struct zfcp_port *port) 692 { 693 struct fc_rport_identifiers ids; 694 struct fc_rport *rport; 695 696 if (port->rport) 697 return; 698 699 ids.node_name = port->wwnn; 700 ids.port_name = port->wwpn; 701 ids.port_id = port->d_id; 702 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 703 704 zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL, 705 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD, 706 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD); 707 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 708 if (!rport) { 709 dev_err(&port->adapter->ccw_device->dev, 710 "Registering port 0x%016Lx failed\n", 711 (unsigned long long)port->wwpn); 712 return; 713 } 714 715 rport->maxframe_size = port->maxframe_size; 716 rport->supported_classes = port->supported_classes; 717 port->rport = rport; 718 port->starget_id = rport->scsi_target_id; 719 720 zfcp_unit_queue_scsi_scan(port); 721 } 722 723 static void zfcp_scsi_rport_block(struct zfcp_port *port) 724 { 725 struct fc_rport *rport = port->rport; 726 727 if (rport) { 728 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL, 729 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL, 730 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL); 731 fc_remote_port_delete(rport); 732 port->rport = NULL; 733 } 734 } 735 736 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 737 { 738 get_device(&port->dev); 739 port->rport_task = RPORT_ADD; 740 741 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 742 put_device(&port->dev); 743 } 744 745 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 746 { 747 get_device(&port->dev); 748 port->rport_task = RPORT_DEL; 749 750 if (port->rport && queue_work(port->adapter->work_queue, 751 &port->rport_work)) 752 return; 753 754 put_device(&port->dev); 755 } 756 757 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 758 { 759 unsigned long flags; 760 struct zfcp_port *port; 761 762 read_lock_irqsave(&adapter->port_list_lock, flags); 763 list_for_each_entry(port, &adapter->port_list, list) 764 zfcp_scsi_schedule_rport_block(port); 765 read_unlock_irqrestore(&adapter->port_list_lock, flags); 766 } 767 768 void zfcp_scsi_rport_work(struct work_struct *work) 769 { 770 struct zfcp_port *port = container_of(work, struct zfcp_port, 771 rport_work); 772 773 set_worker_desc("zrp%c-%16llx", 774 (port->rport_task == RPORT_ADD) ? 'a' : 'd', 775 port->wwpn); /* < WORKER_DESC_LEN=24 */ 776 while (port->rport_task) { 777 if (port->rport_task == RPORT_ADD) { 778 port->rport_task = RPORT_NONE; 779 zfcp_scsi_rport_register(port); 780 } else { 781 port->rport_task = RPORT_NONE; 782 zfcp_scsi_rport_block(port); 783 } 784 } 785 786 put_device(&port->dev); 787 } 788 789 /** 790 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 791 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 792 */ 793 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 794 { 795 unsigned int mask = 0; 796 unsigned int data_div; 797 struct Scsi_Host *shost = adapter->scsi_host; 798 799 data_div = atomic_read(&adapter->status) & 800 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 801 802 if ((enable_dif || zfcp_experimental_dix) && 803 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 804 mask |= SHOST_DIF_TYPE1_PROTECTION; 805 806 if (zfcp_experimental_dix && data_div && 807 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 808 mask |= SHOST_DIX_TYPE1_PROTECTION; 809 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 810 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 811 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 812 shost->max_sectors = shost->sg_tablesize * 8; 813 } 814 815 scsi_host_set_prot(shost, mask); 816 } 817 818 /** 819 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 820 * @scmd: The SCSI command to report the error for 821 * @ascq: The ASCQ to put in the sense buffer 822 * 823 * See the error handling in sd_done for the sense codes used here. 824 * Set DID_SOFT_ERROR to retry the request, if possible. 825 */ 826 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 827 { 828 scsi_build_sense_buffer(1, scmd->sense_buffer, 829 ILLEGAL_REQUEST, 0x10, ascq); 830 set_driver_byte(scmd, DRIVER_SENSE); 831 scmd->result |= SAM_STAT_CHECK_CONDITION; 832 set_host_byte(scmd, DID_SOFT_ERROR); 833 } 834 835 struct fc_function_template zfcp_transport_functions = { 836 .show_starget_port_id = 1, 837 .show_starget_port_name = 1, 838 .show_starget_node_name = 1, 839 .show_rport_supported_classes = 1, 840 .show_rport_maxframe_size = 1, 841 .show_rport_dev_loss_tmo = 1, 842 .show_host_node_name = 1, 843 .show_host_port_name = 1, 844 .show_host_permanent_port_name = 1, 845 .show_host_supported_classes = 1, 846 .show_host_supported_fc4s = 1, 847 .show_host_supported_speeds = 1, 848 .show_host_maxframe_size = 1, 849 .show_host_serial_number = 1, 850 .get_fc_host_stats = zfcp_scsi_get_fc_host_stats, 851 .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats, 852 .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo, 853 .get_host_port_state = zfcp_scsi_get_host_port_state, 854 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 855 .show_host_port_state = 1, 856 .show_host_active_fc4s = 1, 857 .bsg_request = zfcp_fc_exec_bsg_job, 858 .bsg_timeout = zfcp_fc_timeout_bsg_job, 859 /* no functions registered for following dynamic attributes but 860 directly set by LLDD */ 861 .show_host_port_type = 1, 862 .show_host_symbolic_name = 1, 863 .show_host_speed = 1, 864 .show_host_port_id = 1, 865 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 866 }; 867