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, 2020 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 mutex_lock(&zfcp_sysfs_port_units_mutex); 133 if (zfcp_sysfs_port_is_removing(port)) { 134 /* port is already gone */ 135 mutex_unlock(&zfcp_sysfs_port_units_mutex); 136 put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */ 137 return -ENXIO; 138 } 139 mutex_unlock(&zfcp_sysfs_port_units_mutex); 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_dbf_scsi_abort("abrt_wt", scpnt, NULL); 198 zfcp_erp_wait(adapter); 199 ret = fc_block_scsi_eh(scpnt); 200 if (ret) { 201 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL); 202 return ret; 203 } 204 if (!(atomic_read(&adapter->status) & 205 ZFCP_STATUS_COMMON_RUNNING)) { 206 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL); 207 return SUCCESS; 208 } 209 } 210 if (!abrt_req) { 211 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL); 212 return FAILED; 213 } 214 215 wait_for_completion(&abrt_req->completion); 216 217 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) 218 dbf_tag = "abrt_ok"; 219 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) 220 dbf_tag = "abrt_nn"; 221 else { 222 dbf_tag = "abrt_fa"; 223 retval = FAILED; 224 } 225 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req); 226 zfcp_fsf_req_free(abrt_req); 227 return retval; 228 } 229 230 struct zfcp_scsi_req_filter { 231 u8 tmf_scope; 232 u32 lun_handle; 233 u32 port_handle; 234 }; 235 236 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data) 237 { 238 struct zfcp_scsi_req_filter *filter = 239 (struct zfcp_scsi_req_filter *)data; 240 241 /* already aborted - prevent side-effects - or not a SCSI command */ 242 if (old_req->data == NULL || 243 zfcp_fsf_req_is_status_read_buffer(old_req) || 244 old_req->qtcb->header.fsf_command != FSF_QTCB_FCP_CMND) 245 return; 246 247 /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */ 248 if (old_req->qtcb->header.port_handle != filter->port_handle) 249 return; 250 251 if (filter->tmf_scope == FCP_TMF_LUN_RESET && 252 old_req->qtcb->header.lun_handle != filter->lun_handle) 253 return; 254 255 zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req); 256 old_req->data = NULL; 257 } 258 259 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags) 260 { 261 struct zfcp_adapter *adapter = zsdev->port->adapter; 262 struct zfcp_scsi_req_filter filter = { 263 .tmf_scope = FCP_TMF_TGT_RESET, 264 .port_handle = zsdev->port->handle, 265 }; 266 unsigned long flags; 267 268 if (tm_flags == FCP_TMF_LUN_RESET) { 269 filter.tmf_scope = FCP_TMF_LUN_RESET; 270 filter.lun_handle = zsdev->lun_handle; 271 } 272 273 /* 274 * abort_lock secures against other processings - in the abort-function 275 * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data 276 */ 277 write_lock_irqsave(&adapter->abort_lock, flags); 278 zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd, 279 &filter); 280 write_unlock_irqrestore(&adapter->abort_lock, flags); 281 } 282 283 /** 284 * zfcp_scsi_task_mgmt_function() - Send a task management function (sync). 285 * @sdev: Pointer to SCSI device to send the task management command to. 286 * @tm_flags: Task management flags, 287 * here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET. 288 */ 289 static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags) 290 { 291 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev); 292 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 293 struct fc_rport *rport = starget_to_rport(scsi_target(sdev)); 294 struct zfcp_fsf_req *fsf_req = NULL; 295 int retval = SUCCESS, ret; 296 int retry = 3; 297 298 while (retry--) { 299 fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags); 300 if (fsf_req) 301 break; 302 303 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL); 304 zfcp_erp_wait(adapter); 305 ret = fc_block_rport(rport); 306 if (ret) { 307 zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL); 308 return ret; 309 } 310 311 if (!(atomic_read(&adapter->status) & 312 ZFCP_STATUS_COMMON_RUNNING)) { 313 zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL); 314 return SUCCESS; 315 } 316 } 317 if (!fsf_req) { 318 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL); 319 return FAILED; 320 } 321 322 wait_for_completion(&fsf_req->completion); 323 324 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) { 325 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req); 326 retval = FAILED; 327 } else { 328 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req); 329 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags); 330 } 331 332 zfcp_fsf_req_free(fsf_req); 333 return retval; 334 } 335 336 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt) 337 { 338 struct scsi_device *sdev = scpnt->device; 339 340 return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET); 341 } 342 343 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt) 344 { 345 struct scsi_target *starget = scsi_target(scpnt->device); 346 struct fc_rport *rport = starget_to_rport(starget); 347 struct Scsi_Host *shost = rport_to_shost(rport); 348 struct scsi_device *sdev = NULL, *tmp_sdev; 349 struct zfcp_adapter *adapter = 350 (struct zfcp_adapter *)shost->hostdata[0]; 351 int ret; 352 353 shost_for_each_device(tmp_sdev, shost) { 354 if (tmp_sdev->id == starget->id) { 355 sdev = tmp_sdev; 356 break; 357 } 358 } 359 if (!sdev) { 360 ret = FAILED; 361 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret); 362 return ret; 363 } 364 365 ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET); 366 367 /* release reference from above shost_for_each_device */ 368 if (sdev) 369 scsi_device_put(tmp_sdev); 370 371 return ret; 372 } 373 374 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt) 375 { 376 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); 377 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 378 int ret = SUCCESS, fc_ret; 379 380 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) { 381 zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p"); 382 zfcp_erp_wait(adapter); 383 } 384 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1"); 385 zfcp_erp_wait(adapter); 386 fc_ret = fc_block_scsi_eh(scpnt); 387 if (fc_ret) 388 ret = fc_ret; 389 390 zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret); 391 return ret; 392 } 393 394 /** 395 * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset. 396 * @shost: Pointer to Scsi_Host to perform action on. 397 * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET. 398 * 399 * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise. 400 * 401 * This is similar to zfcp_sysfs_adapter_failed_store(). 402 */ 403 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type) 404 { 405 struct zfcp_adapter *adapter = 406 (struct zfcp_adapter *)shost->hostdata[0]; 407 int ret = 0; 408 409 if (reset_type != SCSI_ADAPTER_RESET) { 410 ret = -EOPNOTSUPP; 411 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret); 412 return ret; 413 } 414 415 zfcp_erp_adapter_reset_sync(adapter, "scshr_y"); 416 return ret; 417 } 418 419 struct scsi_transport_template *zfcp_scsi_transport_template; 420 421 static struct scsi_host_template zfcp_scsi_host_template = { 422 .module = THIS_MODULE, 423 .name = "zfcp", 424 .queuecommand = zfcp_scsi_queuecommand, 425 .eh_timed_out = fc_eh_timed_out, 426 .eh_abort_handler = zfcp_scsi_eh_abort_handler, 427 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler, 428 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler, 429 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler, 430 .slave_alloc = zfcp_scsi_slave_alloc, 431 .slave_configure = zfcp_scsi_slave_configure, 432 .slave_destroy = zfcp_scsi_slave_destroy, 433 .change_queue_depth = scsi_change_queue_depth, 434 .host_reset = zfcp_scsi_sysfs_host_reset, 435 .proc_name = "zfcp", 436 .can_queue = 4096, 437 .this_id = -1, 438 .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 439 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2), 440 /* GCD, adjusted later */ 441 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1) 442 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8, 443 /* GCD, adjusted later */ 444 /* report size limit per scatter-gather segment */ 445 .max_segment_size = ZFCP_QDIO_SBALE_LEN, 446 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, 447 .shost_attrs = zfcp_sysfs_shost_attrs, 448 .sdev_attrs = zfcp_sysfs_sdev_attrs, 449 .track_queue_depth = 1, 450 .supported_mode = MODE_INITIATOR, 451 }; 452 453 /** 454 * zfcp_scsi_adapter_register() - Allocate and register SCSI and FC host with 455 * SCSI midlayer 456 * @adapter: The zfcp adapter to register with the SCSI midlayer 457 * 458 * Allocates the SCSI host object for the given adapter, sets basic properties 459 * (such as the transport template, QDIO limits, ...), and registers it with 460 * the midlayer. 461 * 462 * During registration with the midlayer the corresponding FC host object for 463 * the referenced transport class is also implicitely allocated. 464 * 465 * Upon success adapter->scsi_host is set, and upon failure it remains NULL. If 466 * adapter->scsi_host is already set, nothing is done. 467 * 468 * Return: 469 * * 0 - Allocation and registration was successful 470 * * -EEXIST - SCSI and FC host did already exist, nothing was done, nothing 471 * was changed 472 * * -EIO - Allocation or registration failed 473 */ 474 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) 475 { 476 struct ccw_dev_id dev_id; 477 478 if (adapter->scsi_host) 479 return -EEXIST; 480 481 ccw_device_get_id(adapter->ccw_device, &dev_id); 482 /* register adapter as SCSI host with mid layer of SCSI stack */ 483 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template, 484 sizeof (struct zfcp_adapter *)); 485 if (!adapter->scsi_host) 486 goto err_out; 487 488 /* tell the SCSI stack some characteristics of this adapter */ 489 adapter->scsi_host->max_id = 511; 490 adapter->scsi_host->max_lun = 0xFFFFFFFF; 491 adapter->scsi_host->max_channel = 0; 492 adapter->scsi_host->unique_id = dev_id.devno; 493 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */ 494 adapter->scsi_host->transportt = zfcp_scsi_transport_template; 495 496 /* make all basic properties known at registration time */ 497 zfcp_qdio_shost_update(adapter, adapter->qdio); 498 zfcp_scsi_set_prot(adapter); 499 500 adapter->scsi_host->hostdata[0] = (unsigned long) adapter; 501 502 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) { 503 scsi_host_put(adapter->scsi_host); 504 goto err_out; 505 } 506 507 return 0; 508 err_out: 509 adapter->scsi_host = NULL; 510 dev_err(&adapter->ccw_device->dev, 511 "Registering the FCP device with the SCSI stack failed\n"); 512 return -EIO; 513 } 514 515 /** 516 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer 517 * @adapter: The zfcp adapter to unregister. 518 */ 519 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter) 520 { 521 struct Scsi_Host *shost; 522 struct zfcp_port *port; 523 524 shost = adapter->scsi_host; 525 if (!shost) 526 return; 527 528 read_lock_irq(&adapter->port_list_lock); 529 list_for_each_entry(port, &adapter->port_list, list) 530 port->rport = NULL; 531 read_unlock_irq(&adapter->port_list_lock); 532 533 fc_remove_host(shost); 534 scsi_remove_host(shost); 535 scsi_host_put(shost); 536 adapter->scsi_host = NULL; 537 } 538 539 static struct fc_host_statistics* 540 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter) 541 { 542 struct fc_host_statistics *fc_stats; 543 544 if (!adapter->fc_stats) { 545 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL); 546 if (!fc_stats) 547 return NULL; 548 adapter->fc_stats = fc_stats; /* freed in adapter_release */ 549 } 550 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats)); 551 return adapter->fc_stats; 552 } 553 554 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats, 555 struct fsf_qtcb_bottom_port *data, 556 struct fsf_qtcb_bottom_port *old) 557 { 558 fc_stats->seconds_since_last_reset = 559 data->seconds_since_last_reset - old->seconds_since_last_reset; 560 fc_stats->tx_frames = data->tx_frames - old->tx_frames; 561 fc_stats->tx_words = data->tx_words - old->tx_words; 562 fc_stats->rx_frames = data->rx_frames - old->rx_frames; 563 fc_stats->rx_words = data->rx_words - old->rx_words; 564 fc_stats->lip_count = data->lip - old->lip; 565 fc_stats->nos_count = data->nos - old->nos; 566 fc_stats->error_frames = data->error_frames - old->error_frames; 567 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames; 568 fc_stats->link_failure_count = data->link_failure - old->link_failure; 569 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync; 570 fc_stats->loss_of_signal_count = 571 data->loss_of_signal - old->loss_of_signal; 572 fc_stats->prim_seq_protocol_err_count = 573 data->psp_error_counts - old->psp_error_counts; 574 fc_stats->invalid_tx_word_count = 575 data->invalid_tx_words - old->invalid_tx_words; 576 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs; 577 fc_stats->fcp_input_requests = 578 data->input_requests - old->input_requests; 579 fc_stats->fcp_output_requests = 580 data->output_requests - old->output_requests; 581 fc_stats->fcp_control_requests = 582 data->control_requests - old->control_requests; 583 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb; 584 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb; 585 } 586 587 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats, 588 struct fsf_qtcb_bottom_port *data) 589 { 590 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset; 591 fc_stats->tx_frames = data->tx_frames; 592 fc_stats->tx_words = data->tx_words; 593 fc_stats->rx_frames = data->rx_frames; 594 fc_stats->rx_words = data->rx_words; 595 fc_stats->lip_count = data->lip; 596 fc_stats->nos_count = data->nos; 597 fc_stats->error_frames = data->error_frames; 598 fc_stats->dumped_frames = data->dumped_frames; 599 fc_stats->link_failure_count = data->link_failure; 600 fc_stats->loss_of_sync_count = data->loss_of_sync; 601 fc_stats->loss_of_signal_count = data->loss_of_signal; 602 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts; 603 fc_stats->invalid_tx_word_count = data->invalid_tx_words; 604 fc_stats->invalid_crc_count = data->invalid_crcs; 605 fc_stats->fcp_input_requests = data->input_requests; 606 fc_stats->fcp_output_requests = data->output_requests; 607 fc_stats->fcp_control_requests = data->control_requests; 608 fc_stats->fcp_input_megabytes = data->input_mb; 609 fc_stats->fcp_output_megabytes = data->output_mb; 610 } 611 612 static struct fc_host_statistics * 613 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host) 614 { 615 struct zfcp_adapter *adapter; 616 struct fc_host_statistics *fc_stats; 617 struct fsf_qtcb_bottom_port *data; 618 int ret; 619 620 adapter = (struct zfcp_adapter *)host->hostdata[0]; 621 fc_stats = zfcp_scsi_init_fc_host_stats(adapter); 622 if (!fc_stats) 623 return NULL; 624 625 data = kzalloc(sizeof(*data), GFP_KERNEL); 626 if (!data) 627 return NULL; 628 629 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 630 if (ret != 0 && ret != -EAGAIN) { 631 kfree(data); 632 return NULL; 633 } 634 635 if (adapter->stats_reset && 636 ((jiffies/HZ - adapter->stats_reset) < 637 data->seconds_since_last_reset)) 638 zfcp_scsi_adjust_fc_host_stats(fc_stats, data, 639 adapter->stats_reset_data); 640 else 641 zfcp_scsi_set_fc_host_stats(fc_stats, data); 642 643 kfree(data); 644 return fc_stats; 645 } 646 647 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost) 648 { 649 struct zfcp_adapter *adapter; 650 struct fsf_qtcb_bottom_port *data; 651 int ret; 652 653 adapter = (struct zfcp_adapter *)shost->hostdata[0]; 654 data = kzalloc(sizeof(*data), GFP_KERNEL); 655 if (!data) 656 return; 657 658 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data); 659 if (ret != 0 && ret != -EAGAIN) 660 kfree(data); 661 else { 662 adapter->stats_reset = jiffies/HZ; 663 kfree(adapter->stats_reset_data); 664 adapter->stats_reset_data = data; /* finally freed in 665 adapter_release */ 666 } 667 } 668 669 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost) 670 { 671 struct zfcp_adapter *adapter = 672 (struct zfcp_adapter *)shost->hostdata[0]; 673 int status = atomic_read(&adapter->status); 674 675 if ((status & ZFCP_STATUS_COMMON_RUNNING) && 676 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)) 677 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE; 678 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED) 679 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN; 680 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED) 681 fc_host_port_state(shost) = FC_PORTSTATE_ERROR; 682 else 683 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN; 684 } 685 686 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport, 687 u32 timeout) 688 { 689 rport->dev_loss_tmo = timeout; 690 } 691 692 /** 693 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport 694 * @rport: The FC rport where to teminate I/O 695 * 696 * Abort all pending SCSI commands for a port by closing the 697 * port. Using a reopen avoids a conflict with a shutdown 698 * overwriting a reopen. The "forced" ensures that a disappeared port 699 * is not opened again as valid due to the cached plogi data in 700 * non-NPIV mode. 701 */ 702 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport) 703 { 704 struct zfcp_port *port; 705 struct Scsi_Host *shost = rport_to_shost(rport); 706 struct zfcp_adapter *adapter = 707 (struct zfcp_adapter *)shost->hostdata[0]; 708 709 port = zfcp_get_port_by_wwpn(adapter, rport->port_name); 710 711 if (port) { 712 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1"); 713 put_device(&port->dev); 714 } else { 715 zfcp_erp_port_forced_no_port_dbf( 716 "sctrpin", adapter, 717 rport->port_name /* zfcp_scsi_rport_register */, 718 rport->port_id /* zfcp_scsi_rport_register */); 719 } 720 } 721 722 static void zfcp_scsi_rport_register(struct zfcp_port *port) 723 { 724 struct fc_rport_identifiers ids; 725 struct fc_rport *rport; 726 727 if (port->rport) 728 return; 729 730 ids.node_name = port->wwnn; 731 ids.port_name = port->wwpn; 732 ids.port_id = port->d_id; 733 ids.roles = FC_RPORT_ROLE_FCP_TARGET; 734 735 zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL, 736 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD, 737 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD); 738 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids); 739 if (!rport) { 740 dev_err(&port->adapter->ccw_device->dev, 741 "Registering port 0x%016Lx failed\n", 742 (unsigned long long)port->wwpn); 743 return; 744 } 745 746 rport->maxframe_size = port->maxframe_size; 747 rport->supported_classes = port->supported_classes; 748 port->rport = rport; 749 port->starget_id = rport->scsi_target_id; 750 751 zfcp_unit_queue_scsi_scan(port); 752 } 753 754 static void zfcp_scsi_rport_block(struct zfcp_port *port) 755 { 756 struct fc_rport *rport = port->rport; 757 758 if (rport) { 759 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL, 760 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL, 761 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL); 762 fc_remote_port_delete(rport); 763 port->rport = NULL; 764 } 765 } 766 767 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port) 768 { 769 get_device(&port->dev); 770 port->rport_task = RPORT_ADD; 771 772 if (!queue_work(port->adapter->work_queue, &port->rport_work)) 773 put_device(&port->dev); 774 } 775 776 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port) 777 { 778 get_device(&port->dev); 779 port->rport_task = RPORT_DEL; 780 781 if (port->rport && queue_work(port->adapter->work_queue, 782 &port->rport_work)) 783 return; 784 785 put_device(&port->dev); 786 } 787 788 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter) 789 { 790 unsigned long flags; 791 struct zfcp_port *port; 792 793 read_lock_irqsave(&adapter->port_list_lock, flags); 794 list_for_each_entry(port, &adapter->port_list, list) 795 zfcp_scsi_schedule_rport_block(port); 796 read_unlock_irqrestore(&adapter->port_list_lock, flags); 797 } 798 799 void zfcp_scsi_rport_work(struct work_struct *work) 800 { 801 struct zfcp_port *port = container_of(work, struct zfcp_port, 802 rport_work); 803 804 set_worker_desc("zrp%c-%16llx", 805 (port->rport_task == RPORT_ADD) ? 'a' : 'd', 806 port->wwpn); /* < WORKER_DESC_LEN=24 */ 807 while (port->rport_task) { 808 if (port->rport_task == RPORT_ADD) { 809 port->rport_task = RPORT_NONE; 810 zfcp_scsi_rport_register(port); 811 } else { 812 port->rport_task = RPORT_NONE; 813 zfcp_scsi_rport_block(port); 814 } 815 } 816 817 put_device(&port->dev); 818 } 819 820 /** 821 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host 822 * @adapter: The adapter where to configure DIF/DIX for the SCSI host 823 */ 824 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter) 825 { 826 unsigned int mask = 0; 827 unsigned int data_div; 828 struct Scsi_Host *shost = adapter->scsi_host; 829 830 data_div = atomic_read(&adapter->status) & 831 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED; 832 833 if ((enable_dif || zfcp_experimental_dix) && 834 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) 835 mask |= SHOST_DIF_TYPE1_PROTECTION; 836 837 if (zfcp_experimental_dix && data_div && 838 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) { 839 mask |= SHOST_DIX_TYPE1_PROTECTION; 840 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP); 841 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2; 842 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2; 843 shost->max_sectors = shost->sg_tablesize * 8; 844 } 845 846 scsi_host_set_prot(shost, mask); 847 } 848 849 /** 850 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error 851 * @scmd: The SCSI command to report the error for 852 * @ascq: The ASCQ to put in the sense buffer 853 * 854 * See the error handling in sd_done for the sense codes used here. 855 * Set DID_SOFT_ERROR to retry the request, if possible. 856 */ 857 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq) 858 { 859 scsi_build_sense_buffer(1, scmd->sense_buffer, 860 ILLEGAL_REQUEST, 0x10, ascq); 861 set_driver_byte(scmd, DRIVER_SENSE); 862 scmd->result |= SAM_STAT_CHECK_CONDITION; 863 set_host_byte(scmd, DID_SOFT_ERROR); 864 } 865 866 void zfcp_scsi_shost_update_config_data( 867 struct zfcp_adapter *const adapter, 868 const struct fsf_qtcb_bottom_config *const bottom, 869 const bool bottom_incomplete) 870 { 871 struct Scsi_Host *const shost = adapter->scsi_host; 872 const struct fc_els_flogi *nsp, *plogi; 873 874 if (shost == NULL) 875 return; 876 877 snprintf(fc_host_firmware_version(shost), FC_VERSION_STRING_SIZE, 878 "0x%08x", bottom->lic_version); 879 880 if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) { 881 snprintf(fc_host_hardware_version(shost), 882 FC_VERSION_STRING_SIZE, 883 "0x%08x", bottom->hardware_version); 884 memcpy(fc_host_serial_number(shost), bottom->serial_number, 885 min(FC_SERIAL_NUMBER_SIZE, 17)); 886 EBCASC(fc_host_serial_number(shost), 887 min(FC_SERIAL_NUMBER_SIZE, 17)); 888 } 889 890 /* adjust pointers for missing command code */ 891 nsp = (struct fc_els_flogi *) ((u8 *)&bottom->nport_serv_param 892 - sizeof(u32)); 893 plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload 894 - sizeof(u32)); 895 896 snprintf(fc_host_manufacturer(shost), FC_SERIAL_NUMBER_SIZE, "%s", 897 "IBM"); 898 fc_host_port_name(shost) = be64_to_cpu(nsp->fl_wwpn); 899 fc_host_node_name(shost) = be64_to_cpu(nsp->fl_wwnn); 900 fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3; 901 902 zfcp_scsi_set_prot(adapter); 903 904 /* do not evaluate invalid fields */ 905 if (bottom_incomplete) 906 return; 907 908 fc_host_port_id(shost) = ntoh24(bottom->s_id); 909 fc_host_speed(shost) = 910 zfcp_fsf_convert_portspeed(bottom->fc_link_speed); 911 912 snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x", 913 bottom->adapter_type); 914 915 switch (bottom->fc_topology) { 916 case FSF_TOPO_P2P: 917 fc_host_port_type(shost) = FC_PORTTYPE_PTP; 918 fc_host_fabric_name(shost) = 0; 919 break; 920 case FSF_TOPO_FABRIC: 921 fc_host_fabric_name(shost) = be64_to_cpu(plogi->fl_wwnn); 922 if (bottom->connection_features & FSF_FEATURE_NPIV_MODE) 923 fc_host_port_type(shost) = FC_PORTTYPE_NPIV; 924 else 925 fc_host_port_type(shost) = FC_PORTTYPE_NPORT; 926 break; 927 case FSF_TOPO_AL: 928 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT; 929 fallthrough; 930 default: 931 fc_host_fabric_name(shost) = 0; 932 break; 933 } 934 } 935 936 void zfcp_scsi_shost_update_port_data( 937 struct zfcp_adapter *const adapter, 938 const struct fsf_qtcb_bottom_port *const bottom) 939 { 940 struct Scsi_Host *const shost = adapter->scsi_host; 941 942 if (shost == NULL) 943 return; 944 945 fc_host_permanent_port_name(shost) = bottom->wwpn; 946 fc_host_maxframe_size(shost) = bottom->maximum_frame_size; 947 fc_host_supported_speeds(shost) = 948 zfcp_fsf_convert_portspeed(bottom->supported_speed); 949 memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types, 950 FC_FC4_LIST_SIZE); 951 memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types, 952 FC_FC4_LIST_SIZE); 953 } 954 955 struct fc_function_template zfcp_transport_functions = { 956 .show_starget_port_id = 1, 957 .show_starget_port_name = 1, 958 .show_starget_node_name = 1, 959 .show_rport_supported_classes = 1, 960 .show_rport_maxframe_size = 1, 961 .show_rport_dev_loss_tmo = 1, 962 .show_host_node_name = 1, 963 .show_host_port_name = 1, 964 .show_host_permanent_port_name = 1, 965 .show_host_supported_classes = 1, 966 .show_host_supported_fc4s = 1, 967 .show_host_supported_speeds = 1, 968 .show_host_maxframe_size = 1, 969 .show_host_serial_number = 1, 970 .show_host_manufacturer = 1, 971 .show_host_model = 1, 972 .show_host_hardware_version = 1, 973 .show_host_firmware_version = 1, 974 .get_fc_host_stats = zfcp_scsi_get_fc_host_stats, 975 .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats, 976 .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo, 977 .get_host_port_state = zfcp_scsi_get_host_port_state, 978 .terminate_rport_io = zfcp_scsi_terminate_rport_io, 979 .show_host_port_state = 1, 980 .show_host_active_fc4s = 1, 981 .bsg_request = zfcp_fc_exec_bsg_job, 982 .bsg_timeout = zfcp_fc_timeout_bsg_job, 983 /* no functions registered for following dynamic attributes but 984 directly set by LLDD */ 985 .show_host_port_type = 1, 986 .show_host_symbolic_name = 1, 987 .show_host_speed = 1, 988 .show_host_port_id = 1, 989 .show_host_fabric_name = 1, 990 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), 991 }; 992