drivers/s390/scsi/zfcp_fsf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * zfcp device driver
   4  *
   5  * Implementation of FSF commands.
   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/blktrace_api.h>
  14 #include <linux/jiffies.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <scsi/fc/fc_els.h>
  18 #include "zfcp_ext.h"
  19 #include "zfcp_fc.h"
  20 #include "zfcp_dbf.h"
  21 #include "zfcp_qdio.h"
  22 #include "zfcp_reqlist.h"
  23 #include "zfcp_diag.h"
  24
  25 /* timeout for FSF requests sent during scsi_eh: abort or FCP TMF */
  26 #define ZFCP_FSF_SCSI_ER_TIMEOUT (10*HZ)
  27 /* timeout for: exchange config/port data outside ERP, or open/close WKA port */
  28 #define ZFCP_FSF_REQUEST_TIMEOUT (60*HZ)
  29
  30 struct kmem_cache *zfcp_fsf_qtcb_cache;
  31
  32 static bool ber_stop = true;
  33 module_param(ber_stop, bool, 0600);
  34 MODULE_PARM_DESC(ber_stop,
  35                  "Shuts down FCP devices for FCP channels that report a bit-error count in excess of its threshold (default on)");
  36
  37 static void zfcp_fsf_request_timeout_handler(struct timer_list *t)
  38 {
  39         struct zfcp_fsf_req *fsf_req = from_timer(fsf_req, t, timer);
  40         struct zfcp_adapter *adapter = fsf_req->adapter;
  41
  42         zfcp_qdio_siosl(adapter);
  43         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED,
  44                                 "fsrth_1");
  45 }
  46
  47 static void zfcp_fsf_start_timer(struct zfcp_fsf_req *fsf_req,
  48                                  unsigned long timeout)
  49 {
  50         fsf_req->timer.function = zfcp_fsf_request_timeout_handler;
  51         fsf_req->timer.expires = jiffies + timeout;
  52         add_timer(&fsf_req->timer);
  53 }
  54
  55 static void zfcp_fsf_start_erp_timer(struct zfcp_fsf_req *fsf_req)
  56 {
  57         BUG_ON(!fsf_req->erp_action);
  58         fsf_req->timer.function = zfcp_erp_timeout_handler;
  59         fsf_req->timer.expires = jiffies + 30 * HZ;
  60         add_timer(&fsf_req->timer);
  61 }
  62
  63 /* association between FSF command and FSF QTCB type */
  64 static u32 fsf_qtcb_type[] = {
  65         [FSF_QTCB_FCP_CMND] =             FSF_IO_COMMAND,
  66         [FSF_QTCB_ABORT_FCP_CMND] =       FSF_SUPPORT_COMMAND,
  67         [FSF_QTCB_OPEN_PORT_WITH_DID] =   FSF_SUPPORT_COMMAND,
  68         [FSF_QTCB_OPEN_LUN] =             FSF_SUPPORT_COMMAND,
  69         [FSF_QTCB_CLOSE_LUN] =            FSF_SUPPORT_COMMAND,
  70         [FSF_QTCB_CLOSE_PORT] =           FSF_SUPPORT_COMMAND,
  71         [FSF_QTCB_CLOSE_PHYSICAL_PORT] =  FSF_SUPPORT_COMMAND,
  72         [FSF_QTCB_SEND_ELS] =             FSF_SUPPORT_COMMAND,
  73         [FSF_QTCB_SEND_GENERIC] =         FSF_SUPPORT_COMMAND,
  74         [FSF_QTCB_EXCHANGE_CONFIG_DATA] = FSF_CONFIG_COMMAND,
  75         [FSF_QTCB_EXCHANGE_PORT_DATA] =   FSF_PORT_COMMAND,
  76         [FSF_QTCB_DOWNLOAD_CONTROL_FILE] = FSF_SUPPORT_COMMAND,
  77         [FSF_QTCB_UPLOAD_CONTROL_FILE] =  FSF_SUPPORT_COMMAND
  78 };
  79
  80 static void zfcp_fsf_class_not_supp(struct zfcp_fsf_req *req)
  81 {
  82         dev_err(&req->adapter->ccw_device->dev, "FCP device not "
  83                 "operational because of an unsupported FC class\n");
  84         zfcp_erp_adapter_shutdown(req->adapter, 0, "fscns_1");
  85         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
  86 }
  87
  88 /**
  89  * zfcp_fsf_req_free - free memory used by fsf request
  90  * @req: pointer to struct zfcp_fsf_req
  91  */
  92 void zfcp_fsf_req_free(struct zfcp_fsf_req *req)
  93 {
  94         if (likely(req->pool)) {
  95                 if (likely(!zfcp_fsf_req_is_status_read_buffer(req)))
  96                         mempool_free(req->qtcb, req->adapter->pool.qtcb_pool);
  97                 mempool_free(req, req->pool);
  98                 return;
  99         }
 100
 101         if (likely(!zfcp_fsf_req_is_status_read_buffer(req)))
 102                 kmem_cache_free(zfcp_fsf_qtcb_cache, req->qtcb);
 103         kfree(req);
 104 }
 105
 106 static void zfcp_fsf_status_read_port_closed(struct zfcp_fsf_req *req)
 107 {
 108         unsigned long flags;
 109         struct fsf_status_read_buffer *sr_buf = req->data;
 110         struct zfcp_adapter *adapter = req->adapter;
 111         struct zfcp_port *port;
 112         int d_id = ntoh24(sr_buf->d_id);
 113
 114         read_lock_irqsave(&adapter->port_list_lock, flags);
 115         list_for_each_entry(port, &adapter->port_list, list)
 116                 if (port->d_id == d_id) {
 117                         zfcp_erp_port_reopen(port, 0, "fssrpc1");
 118                         break;
 119                 }
 120         read_unlock_irqrestore(&adapter->port_list_lock, flags);
 121 }
 122
 123 void zfcp_fsf_fc_host_link_down(struct zfcp_adapter *adapter)
 124 {
 125         struct Scsi_Host *shost = adapter->scsi_host;
 126
 127         adapter->hydra_version = 0;
 128         adapter->peer_wwpn = 0;
 129         adapter->peer_wwnn = 0;
 130         adapter->peer_d_id = 0;
 131
 132         /* if there is no shost yet, we have nothing to zero-out */
 133         if (shost == NULL)
 134                 return;
 135
 136         fc_host_port_id(shost) = 0;
 137         fc_host_fabric_name(shost) = 0;
 138         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
 139         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
 140         snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x", 0);
 141         memset(fc_host_active_fc4s(shost), 0, FC_FC4_LIST_SIZE);
 142 }
 143
 144 static void zfcp_fsf_link_down_info_eval(struct zfcp_fsf_req *req,
 145                                          struct fsf_link_down_info *link_down)
 146 {
 147         struct zfcp_adapter *adapter = req->adapter;
 148
 149         if (atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 150                 return;
 151
 152         atomic_or(ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 153
 154         zfcp_scsi_schedule_rports_block(adapter);
 155
 156         zfcp_fsf_fc_host_link_down(adapter);
 157
 158         if (!link_down)
 159                 goto out;
 160
 161         switch (link_down->error_code) {
 162         case FSF_PSQ_LINK_NO_LIGHT:
 163                 dev_warn(&req->adapter->ccw_device->dev,
 164                          "There is no light signal from the local "
 165                          "fibre channel cable\n");
 166                 break;
 167         case FSF_PSQ_LINK_WRAP_PLUG:
 168                 dev_warn(&req->adapter->ccw_device->dev,
 169                          "There is a wrap plug instead of a fibre "
 170                          "channel cable\n");
 171                 break;
 172         case FSF_PSQ_LINK_NO_FCP:
 173                 dev_warn(&req->adapter->ccw_device->dev,
 174                          "The adjacent fibre channel node does not "
 175                          "support FCP\n");
 176                 break;
 177         case FSF_PSQ_LINK_FIRMWARE_UPDATE:
 178                 dev_warn(&req->adapter->ccw_device->dev,
 179                          "The FCP device is suspended because of a "
 180                          "firmware update\n");
 181                 break;
 182         case FSF_PSQ_LINK_INVALID_WWPN:
 183                 dev_warn(&req->adapter->ccw_device->dev,
 184                          "The FCP device detected a WWPN that is "
 185                          "duplicate or not valid\n");
 186                 break;
 187         case FSF_PSQ_LINK_NO_NPIV_SUPPORT:
 188                 dev_warn(&req->adapter->ccw_device->dev,
 189                          "The fibre channel fabric does not support NPIV\n");
 190                 break;
 191         case FSF_PSQ_LINK_NO_FCP_RESOURCES:
 192                 dev_warn(&req->adapter->ccw_device->dev,
 193                          "The FCP adapter cannot support more NPIV ports\n");
 194                 break;
 195         case FSF_PSQ_LINK_NO_FABRIC_RESOURCES:
 196                 dev_warn(&req->adapter->ccw_device->dev,
 197                          "The adjacent switch cannot support "
 198                          "more NPIV ports\n");
 199                 break;
 200         case FSF_PSQ_LINK_FABRIC_LOGIN_UNABLE:
 201                 dev_warn(&req->adapter->ccw_device->dev,
 202                          "The FCP adapter could not log in to the "
 203                          "fibre channel fabric\n");
 204                 break;
 205         case FSF_PSQ_LINK_WWPN_ASSIGNMENT_CORRUPTED:
 206                 dev_warn(&req->adapter->ccw_device->dev,
 207                          "The WWPN assignment file on the FCP adapter "
 208                          "has been damaged\n");
 209                 break;
 210         case FSF_PSQ_LINK_MODE_TABLE_CURRUPTED:
 211                 dev_warn(&req->adapter->ccw_device->dev,
 212                          "The mode table on the FCP adapter "
 213                          "has been damaged\n");
 214                 break;
 215         case FSF_PSQ_LINK_NO_WWPN_ASSIGNMENT:
 216                 dev_warn(&req->adapter->ccw_device->dev,
 217                          "All NPIV ports on the FCP adapter have "
 218                          "been assigned\n");
 219                 break;
 220         default:
 221                 dev_warn(&req->adapter->ccw_device->dev,
 222                          "The link between the FCP adapter and "
 223                          "the FC fabric is down\n");
 224         }
 225 out:
 226         zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 227 }
 228
 229 static void zfcp_fsf_status_read_link_down(struct zfcp_fsf_req *req)
 230 {
 231         struct fsf_status_read_buffer *sr_buf = req->data;
 232         struct fsf_link_down_info *ldi =
 233                 (struct fsf_link_down_info *) &sr_buf->payload;
 234
 235         switch (sr_buf->status_subtype) {
 236         case FSF_STATUS_READ_SUB_NO_PHYSICAL_LINK:
 237         case FSF_STATUS_READ_SUB_FDISC_FAILED:
 238                 zfcp_fsf_link_down_info_eval(req, ldi);
 239                 break;
 240         case FSF_STATUS_READ_SUB_FIRMWARE_UPDATE:
 241                 zfcp_fsf_link_down_info_eval(req, NULL);
 242         }
 243 }
 244
 245 static void
 246 zfcp_fsf_status_read_version_change(struct zfcp_adapter *adapter,
 247                                     struct fsf_status_read_buffer *sr_buf)
 248 {
 249         if (sr_buf->status_subtype == FSF_STATUS_READ_SUB_LIC_CHANGE) {
 250                 u32 version = sr_buf->payload.version_change.current_version;
 251
 252                 WRITE_ONCE(adapter->fsf_lic_version, version);
 253                 snprintf(fc_host_firmware_version(adapter->scsi_host),
 254                          FC_VERSION_STRING_SIZE, "%#08x", version);
 255         }
 256 }
 257
 258 static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 259 {
 260         struct zfcp_adapter *adapter = req->adapter;
 261         struct fsf_status_read_buffer *sr_buf = req->data;
 262
 263         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 264                 zfcp_dbf_hba_fsf_uss("fssrh_1", req);
 265                 mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
 266                 zfcp_fsf_req_free(req);
 267                 return;
 268         }
 269
 270         zfcp_dbf_hba_fsf_uss("fssrh_4", req);
 271
 272         switch (sr_buf->status_type) {
 273         case FSF_STATUS_READ_PORT_CLOSED:
 274                 zfcp_fsf_status_read_port_closed(req);
 275                 break;
 276         case FSF_STATUS_READ_INCOMING_ELS:
 277                 zfcp_fc_incoming_els(req);
 278                 break;
 279         case FSF_STATUS_READ_SENSE_DATA_AVAIL:
 280                 break;
 281         case FSF_STATUS_READ_BIT_ERROR_THRESHOLD:
 282                 zfcp_dbf_hba_bit_err("fssrh_3", req);
 283                 if (ber_stop) {
 284                         dev_warn(&adapter->ccw_device->dev,
 285                                  "All paths over this FCP device are disused because of excessive bit errors\n");
 286                         zfcp_erp_adapter_shutdown(adapter, 0, "fssrh_b");
 287                 } else {
 288                         dev_warn(&adapter->ccw_device->dev,
 289                                  "The error threshold for checksum statistics has been exceeded\n");
 290                 }
 291                 break;
 292         case FSF_STATUS_READ_LINK_DOWN:
 293                 zfcp_fsf_status_read_link_down(req);
 294                 zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKDOWN, 0);
 295                 break;
 296         case FSF_STATUS_READ_LINK_UP:
 297                 dev_info(&adapter->ccw_device->dev,
 298                          "The local link has been restored\n");
 299                 /* All ports should be marked as ready to run again */
 300                 zfcp_erp_set_adapter_status(adapter,
 301                                             ZFCP_STATUS_COMMON_RUNNING);
 302                 zfcp_erp_adapter_reopen(adapter,
 303                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 304                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 305                                         "fssrh_2");
 306                 zfcp_fc_enqueue_event(adapter, FCH_EVT_LINKUP, 0);
 307
 308                 break;
 309         case FSF_STATUS_READ_NOTIFICATION_LOST:
 310                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_INCOMING_ELS)
 311                         zfcp_fc_conditional_port_scan(adapter);
 312                 if (sr_buf->status_subtype & FSF_STATUS_READ_SUB_VERSION_CHANGE)
 313                         queue_work(adapter->work_queue,
 314                                    &adapter->version_change_lost_work);
 315                 break;
 316         case FSF_STATUS_READ_FEATURE_UPDATE_ALERT:
 317                 adapter->adapter_features = sr_buf->payload.word[0];
 318                 break;
 319         case FSF_STATUS_READ_VERSION_CHANGE:
 320                 zfcp_fsf_status_read_version_change(adapter, sr_buf);
 321                 break;
 322         }
 323
 324         mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
 325         zfcp_fsf_req_free(req);
 326
 327         atomic_inc(&adapter->stat_miss);
 328         queue_work(adapter->work_queue, &adapter->stat_work);
 329 }
 330
 331 static void zfcp_fsf_fsfstatus_qual_eval(struct zfcp_fsf_req *req)
 332 {
 333         switch (req->qtcb->header.fsf_status_qual.word[0]) {
 334         case FSF_SQ_FCP_RSP_AVAILABLE:
 335         case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
 336         case FSF_SQ_NO_RETRY_POSSIBLE:
 337         case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
 338                 return;
 339         case FSF_SQ_COMMAND_ABORTED:
 340                 break;
 341         case FSF_SQ_NO_RECOM:
 342                 dev_err(&req->adapter->ccw_device->dev,
 343                         "The FCP adapter reported a problem "
 344                         "that cannot be recovered\n");
 345                 zfcp_qdio_siosl(req->adapter);
 346                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfsqe1");
 347                 break;
 348         }
 349         /* all non-return stats set FSFREQ_ERROR*/
 350         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 351 }
 352
 353 static void zfcp_fsf_fsfstatus_eval(struct zfcp_fsf_req *req)
 354 {
 355         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
 356                 return;
 357
 358         switch (req->qtcb->header.fsf_status) {
 359         case FSF_UNKNOWN_COMMAND:
 360                 dev_err(&req->adapter->ccw_device->dev,
 361                         "The FCP adapter does not recognize the command 0x%x\n",
 362                         req->qtcb->header.fsf_command);
 363                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fsfse_1");
 364                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 365                 break;
 366         case FSF_ADAPTER_STATUS_AVAILABLE:
 367                 zfcp_fsf_fsfstatus_qual_eval(req);
 368                 break;
 369         }
 370 }
 371
 372 static void zfcp_fsf_protstatus_eval(struct zfcp_fsf_req *req)
 373 {
 374         struct zfcp_adapter *adapter = req->adapter;
 375         struct fsf_qtcb *qtcb = req->qtcb;
 376         union fsf_prot_status_qual *psq = &qtcb->prefix.prot_status_qual;
 377
 378         zfcp_dbf_hba_fsf_response(req);
 379
 380         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
 381                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 382                 return;
 383         }
 384
 385         switch (qtcb->prefix.prot_status) {
 386         case FSF_PROT_GOOD:
 387         case FSF_PROT_FSF_STATUS_PRESENTED:
 388                 return;
 389         case FSF_PROT_QTCB_VERSION_ERROR:
 390                 dev_err(&adapter->ccw_device->dev,
 391                         "QTCB version 0x%x not supported by FCP adapter "
 392                         "(0x%x to 0x%x)\n", FSF_QTCB_CURRENT_VERSION,
 393                         psq->word[0], psq->word[1]);
 394                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_1");
 395                 break;
 396         case FSF_PROT_ERROR_STATE:
 397         case FSF_PROT_SEQ_NUMB_ERROR:
 398                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_2");
 399                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 400                 break;
 401         case FSF_PROT_UNSUPP_QTCB_TYPE:
 402                 dev_err(&adapter->ccw_device->dev,
 403                         "The QTCB type is not supported by the FCP adapter\n");
 404                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_3");
 405                 break;
 406         case FSF_PROT_HOST_CONNECTION_INITIALIZING:
 407                 atomic_or(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 408                                 &adapter->status);
 409                 break;
 410         case FSF_PROT_DUPLICATE_REQUEST_ID:
 411                 dev_err(&adapter->ccw_device->dev,
 412                         "0x%Lx is an ambiguous request identifier\n",
 413                         (unsigned long long)qtcb->bottom.support.req_handle);
 414                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_4");
 415                 break;
 416         case FSF_PROT_LINK_DOWN:
 417                 zfcp_fsf_link_down_info_eval(req, &psq->link_down_info);
 418                 /* go through reopen to flush pending requests */
 419                 zfcp_erp_adapter_reopen(adapter, 0, "fspse_6");
 420                 break;
 421         case FSF_PROT_REEST_QUEUE:
 422                 /* All ports should be marked as ready to run again */
 423                 zfcp_erp_set_adapter_status(adapter,
 424                                             ZFCP_STATUS_COMMON_RUNNING);
 425                 zfcp_erp_adapter_reopen(adapter,
 426                                         ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
 427                                         ZFCP_STATUS_COMMON_ERP_FAILED,
 428                                         "fspse_8");
 429                 break;
 430         default:
 431                 dev_err(&adapter->ccw_device->dev,
 432                         "0x%x is not a valid transfer protocol status\n",
 433                         qtcb->prefix.prot_status);
 434                 zfcp_qdio_siosl(adapter);
 435                 zfcp_erp_adapter_shutdown(adapter, 0, "fspse_9");
 436         }
 437         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 438 }
 439
 440 /**
 441  * zfcp_fsf_req_complete - process completion of a FSF request
 442  * @req: The FSF request that has been completed.
 443  *
 444  * When a request has been completed either from the FCP adapter,
 445  * or it has been dismissed due to a queue shutdown, this function
 446  * is called to process the completion status and trigger further
 447  * events related to the FSF request.
 448  * Caller must ensure that the request has been removed from
 449  * adapter->req_list, to protect against concurrent modification
 450  * by zfcp_erp_strategy_check_fsfreq().
 451  */
 452 static void zfcp_fsf_req_complete(struct zfcp_fsf_req *req)
 453 {
 454         struct zfcp_erp_action *erp_action;
 455
 456         if (unlikely(zfcp_fsf_req_is_status_read_buffer(req))) {
 457                 zfcp_fsf_status_read_handler(req);
 458                 return;
 459         }
 460
 461         del_timer_sync(&req->timer);
 462         zfcp_fsf_protstatus_eval(req);
 463         zfcp_fsf_fsfstatus_eval(req);
 464         req->handler(req);
 465
 466         erp_action = req->erp_action;
 467         if (erp_action)
 468                 zfcp_erp_notify(erp_action, 0);
 469
 470         if (likely(req->status & ZFCP_STATUS_FSFREQ_CLEANUP))
 471                 zfcp_fsf_req_free(req);
 472         else
 473                 complete(&req->completion);
 474 }
 475
 476 /**
 477  * zfcp_fsf_req_dismiss_all - dismiss all fsf requests
 478  * @adapter: pointer to struct zfcp_adapter
 479  *
 480  * Never ever call this without shutting down the adapter first.
 481  * Otherwise the adapter would continue using and corrupting s390 storage.
 482  * Included BUG_ON() call to ensure this is done.
 483  * ERP is supposed to be the only user of this function.
 484  */
 485 void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
 486 {
 487         struct zfcp_fsf_req *req, *tmp;
 488         LIST_HEAD(remove_queue);
 489
 490         BUG_ON(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_QDIOUP);
 491         zfcp_reqlist_move(adapter->req_list, &remove_queue);
 492
 493         list_for_each_entry_safe(req, tmp, &remove_queue, list) {
 494                 list_del(&req->list);
 495                 req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 496                 zfcp_fsf_req_complete(req);
 497         }
 498 }
 499
 500 #define ZFCP_FSF_PORTSPEED_1GBIT        (1 <<  0)
 501 #define ZFCP_FSF_PORTSPEED_2GBIT        (1 <<  1)
 502 #define ZFCP_FSF_PORTSPEED_4GBIT        (1 <<  2)
 503 #define ZFCP_FSF_PORTSPEED_10GBIT       (1 <<  3)
 504 #define ZFCP_FSF_PORTSPEED_8GBIT        (1 <<  4)
 505 #define ZFCP_FSF_PORTSPEED_16GBIT       (1 <<  5)
 506 #define ZFCP_FSF_PORTSPEED_32GBIT       (1 <<  6)
 507 #define ZFCP_FSF_PORTSPEED_64GBIT       (1 <<  7)
 508 #define ZFCP_FSF_PORTSPEED_128GBIT      (1 <<  8)
 509 #define ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED (1 << 15)
 510
 511 u32 zfcp_fsf_convert_portspeed(u32 fsf_speed)
 512 {
 513         u32 fdmi_speed = 0;
 514         if (fsf_speed & ZFCP_FSF_PORTSPEED_1GBIT)
 515                 fdmi_speed |= FC_PORTSPEED_1GBIT;
 516         if (fsf_speed & ZFCP_FSF_PORTSPEED_2GBIT)
 517                 fdmi_speed |= FC_PORTSPEED_2GBIT;
 518         if (fsf_speed & ZFCP_FSF_PORTSPEED_4GBIT)
 519                 fdmi_speed |= FC_PORTSPEED_4GBIT;
 520         if (fsf_speed & ZFCP_FSF_PORTSPEED_10GBIT)
 521                 fdmi_speed |= FC_PORTSPEED_10GBIT;
 522         if (fsf_speed & ZFCP_FSF_PORTSPEED_8GBIT)
 523                 fdmi_speed |= FC_PORTSPEED_8GBIT;
 524         if (fsf_speed & ZFCP_FSF_PORTSPEED_16GBIT)
 525                 fdmi_speed |= FC_PORTSPEED_16GBIT;
 526         if (fsf_speed & ZFCP_FSF_PORTSPEED_32GBIT)
 527                 fdmi_speed |= FC_PORTSPEED_32GBIT;
 528         if (fsf_speed & ZFCP_FSF_PORTSPEED_64GBIT)
 529                 fdmi_speed |= FC_PORTSPEED_64GBIT;
 530         if (fsf_speed & ZFCP_FSF_PORTSPEED_128GBIT)
 531                 fdmi_speed |= FC_PORTSPEED_128GBIT;
 532         if (fsf_speed & ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED)
 533                 fdmi_speed |= FC_PORTSPEED_NOT_NEGOTIATED;
 534         return fdmi_speed;
 535 }
 536
 537 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 538 {
 539         struct fsf_qtcb_bottom_config *bottom = &req->qtcb->bottom.config;
 540         struct zfcp_adapter *adapter = req->adapter;
 541         struct fc_els_flogi *plogi;
 542
 543         /* adjust pointers for missing command code */
 544         plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload
 545                                         - sizeof(u32));
 546
 547         if (req->data)
 548                 memcpy(req->data, bottom, sizeof(*bottom));
 549
 550         adapter->timer_ticks = bottom->timer_interval & ZFCP_FSF_TIMER_INT_MASK;
 551         adapter->stat_read_buf_num = max(bottom->status_read_buf_num,
 552                                          (u16)FSF_STATUS_READS_RECOM);
 553
 554         /* no error return above here, otherwise must fix call chains */
 555         /* do not evaluate invalid fields */
 556         if (req->qtcb->header.fsf_status == FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE)
 557                 return 0;
 558
 559         adapter->hydra_version = bottom->adapter_type;
 560
 561         switch (bottom->fc_topology) {
 562         case FSF_TOPO_P2P:
 563                 adapter->peer_d_id = ntoh24(bottom->peer_d_id);
 564                 adapter->peer_wwpn = be64_to_cpu(plogi->fl_wwpn);
 565                 adapter->peer_wwnn = be64_to_cpu(plogi->fl_wwnn);
 566                 break;
 567         case FSF_TOPO_FABRIC:
 568                 break;
 569         case FSF_TOPO_AL:
 570         default:
 571                 dev_err(&adapter->ccw_device->dev,
 572                         "Unknown or unsupported arbitrated loop "
 573                         "fibre channel topology detected\n");
 574                 zfcp_erp_adapter_shutdown(adapter, 0, "fsece_1");
 575                 return -EIO;
 576         }
 577
 578         return 0;
 579 }
 580
 581 static void zfcp_fsf_exchange_config_data_handler(struct zfcp_fsf_req *req)
 582 {
 583         struct zfcp_adapter *adapter = req->adapter;
 584         struct zfcp_diag_header *const diag_hdr =
 585                 &adapter->diagnostics->config_data.header;
 586         struct fsf_qtcb *qtcb = req->qtcb;
 587         struct fsf_qtcb_bottom_config *bottom = &qtcb->bottom.config;
 588
 589         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 590                 return;
 591
 592         adapter->fsf_lic_version = bottom->lic_version;
 593         adapter->adapter_features = bottom->adapter_features;
 594         adapter->connection_features = bottom->connection_features;
 595         adapter->peer_wwpn = 0;
 596         adapter->peer_wwnn = 0;
 597         adapter->peer_d_id = 0;
 598
 599         switch (qtcb->header.fsf_status) {
 600         case FSF_GOOD:
 601                 /*
 602                  * usually we wait with an update till the cache is too old,
 603                  * but because we have the data available, update it anyway
 604                  */
 605                 zfcp_diag_update_xdata(diag_hdr, bottom, false);
 606
 607                 zfcp_scsi_shost_update_config_data(adapter, bottom, false);
 608                 if (zfcp_fsf_exchange_config_evaluate(req))
 609                         return;
 610
 611                 if (bottom->max_qtcb_size < sizeof(struct fsf_qtcb)) {
 612                         dev_err(&adapter->ccw_device->dev,
 613                                 "FCP adapter maximum QTCB size (%d bytes) "
 614                                 "is too small\n",
 615                                 bottom->max_qtcb_size);
 616                         zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh1");
 617                         return;
 618                 }
 619                 atomic_or(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 620                                 &adapter->status);
 621                 break;
 622         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 623                 zfcp_diag_update_xdata(diag_hdr, bottom, true);
 624                 req->status |= ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE;
 625
 626                 /* avoids adapter shutdown to be able to recognize
 627                  * events such as LINK UP */
 628                 atomic_or(ZFCP_STATUS_ADAPTER_XCONFIG_OK,
 629                                 &adapter->status);
 630                 zfcp_fsf_link_down_info_eval(req,
 631                         &qtcb->header.fsf_status_qual.link_down_info);
 632
 633                 zfcp_scsi_shost_update_config_data(adapter, bottom, true);
 634                 if (zfcp_fsf_exchange_config_evaluate(req))
 635                         return;
 636                 break;
 637         default:
 638                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh3");
 639                 return;
 640         }
 641
 642         if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT)
 643                 adapter->hardware_version = bottom->hardware_version;
 644
 645         if (FSF_QTCB_CURRENT_VERSION < bottom->low_qtcb_version) {
 646                 dev_err(&adapter->ccw_device->dev,
 647                         "The FCP adapter only supports newer "
 648                         "control block versions\n");
 649                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh4");
 650                 return;
 651         }
 652         if (FSF_QTCB_CURRENT_VERSION > bottom->high_qtcb_version) {
 653                 dev_err(&adapter->ccw_device->dev,
 654                         "The FCP adapter only supports older "
 655                         "control block versions\n");
 656                 zfcp_erp_adapter_shutdown(adapter, 0, "fsecdh5");
 657         }
 658 }
 659
 660 /*
 661  * Mapping of FC Endpoint Security flag masks to mnemonics
 662  *
 663  * NOTE: Update macro ZFCP_FSF_MAX_FC_SECURITY_MNEMONIC_LENGTH when making any
 664  *       changes.
 665  */
 666 static const struct {
 667         u32     mask;
 668         char    *name;
 669 } zfcp_fsf_fc_security_mnemonics[] = {
 670         { FSF_FC_SECURITY_AUTH,         "Authentication" },
 671         { FSF_FC_SECURITY_ENC_FCSP2 |
 672           FSF_FC_SECURITY_ENC_ERAS,     "Encryption" },
 673 };
 674
 675 /* maximum strlen(zfcp_fsf_fc_security_mnemonics[...].name) + 1 */
 676 #define ZFCP_FSF_MAX_FC_SECURITY_MNEMONIC_LENGTH 15
 677
 678 /**
 679  * zfcp_fsf_scnprint_fc_security() - translate FC Endpoint Security flags into
 680  *                                   mnemonics and place in a buffer
 681  * @buf        : the buffer to place the translated FC Endpoint Security flag(s)
 682  *               into
 683  * @size       : the size of the buffer, including the trailing null space
 684  * @fc_security: one or more FC Endpoint Security flags, or zero
 685  * @fmt        : specifies whether a list or a single item is to be put into the
 686  *               buffer
 687  *
 688  * The Fibre Channel (FC) Endpoint Security flags are translated into mnemonics.
 689  * If the FC Endpoint Security flags are zero "none" is placed into the buffer.
 690  *
 691  * With ZFCP_FSF_PRINT_FMT_LIST the mnemonics are placed as a list separated by
 692  * a comma followed by a space into the buffer. If one or more FC Endpoint
 693  * Security flags cannot be translated into a mnemonic, as they are undefined
 694  * in zfcp_fsf_fc_security_mnemonics, their bitwise ORed value in hexadecimal
 695  * representation is placed into the buffer.
 696  *
 697  * With ZFCP_FSF_PRINT_FMT_SINGLEITEM only one single mnemonic is placed into
 698  * the buffer. If the FC Endpoint Security flag cannot be translated, as it is
 699  * undefined in zfcp_fsf_fc_security_mnemonics, its value in hexadecimal
 700  * representation is placed into the buffer. If more than one FC Endpoint
 701  * Security flag was specified, their value in hexadecimal representation is
 702  * placed into the buffer. The macro ZFCP_FSF_MAX_FC_SECURITY_MNEMONIC_LENGTH
 703  * can be used to define a buffer that is large enough to hold one mnemonic.
 704  *
 705  * Return: The number of characters written into buf not including the trailing
 706  *         '\0'. If size is == 0 the function returns 0.
 707  */
 708 ssize_t zfcp_fsf_scnprint_fc_security(char *buf, size_t size, u32 fc_security,
 709                                       enum zfcp_fsf_print_fmt fmt)
 710 {
 711         const char *prefix = "";
 712         ssize_t len = 0;
 713         int i;
 714
 715         if (fc_security == 0)
 716                 return scnprintf(buf, size, "none");
 717         if (fmt == ZFCP_FSF_PRINT_FMT_SINGLEITEM && hweight32(fc_security) != 1)
 718                 return scnprintf(buf, size, "0x%08x", fc_security);
 719
 720         for (i = 0; i < ARRAY_SIZE(zfcp_fsf_fc_security_mnemonics); i++) {
 721                 if (!(fc_security & zfcp_fsf_fc_security_mnemonics[i].mask))
 722                         continue;
 723
 724                 len += scnprintf(buf + len, size - len, "%s%s", prefix,
 725                                  zfcp_fsf_fc_security_mnemonics[i].name);
 726                 prefix = ", ";
 727                 fc_security &= ~zfcp_fsf_fc_security_mnemonics[i].mask;
 728         }
 729
 730         if (fc_security != 0)
 731                 len += scnprintf(buf + len, size - len, "%s0x%08x",
 732                                  prefix, fc_security);
 733
 734         return len;
 735 }
 736
 737 static void zfcp_fsf_dbf_adapter_fc_security(struct zfcp_adapter *adapter,
 738                                              struct zfcp_fsf_req *req)
 739 {
 740         if (adapter->fc_security_algorithms ==
 741             adapter->fc_security_algorithms_old) {
 742                 /* no change, no trace */
 743                 return;
 744         }
 745
 746         zfcp_dbf_hba_fsf_fces("fsfcesa", req, ZFCP_DBF_INVALID_WWPN,
 747                               adapter->fc_security_algorithms_old,
 748                               adapter->fc_security_algorithms);
 749
 750         adapter->fc_security_algorithms_old = adapter->fc_security_algorithms;
 751 }
 752
 753 static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
 754 {
 755         struct zfcp_adapter *adapter = req->adapter;
 756         struct fsf_qtcb_bottom_port *bottom = &req->qtcb->bottom.port;
 757
 758         if (req->data)
 759                 memcpy(req->data, bottom, sizeof(*bottom));
 760
 761         if (adapter->adapter_features & FSF_FEATURE_FC_SECURITY)
 762                 adapter->fc_security_algorithms =
 763                         bottom->fc_security_algorithms;
 764         else
 765                 adapter->fc_security_algorithms = 0;
 766         zfcp_fsf_dbf_adapter_fc_security(adapter, req);
 767 }
 768
 769 static void zfcp_fsf_exchange_port_data_handler(struct zfcp_fsf_req *req)
 770 {
 771         struct zfcp_diag_header *const diag_hdr =
 772                 &req->adapter->diagnostics->port_data.header;
 773         struct fsf_qtcb *qtcb = req->qtcb;
 774         struct fsf_qtcb_bottom_port *bottom = &qtcb->bottom.port;
 775
 776         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 777                 return;
 778
 779         switch (qtcb->header.fsf_status) {
 780         case FSF_GOOD:
 781                 /*
 782                  * usually we wait with an update till the cache is too old,
 783                  * but because we have the data available, update it anyway
 784                  */
 785                 zfcp_diag_update_xdata(diag_hdr, bottom, false);
 786
 787                 zfcp_scsi_shost_update_port_data(req->adapter, bottom);
 788                 zfcp_fsf_exchange_port_evaluate(req);
 789                 break;
 790         case FSF_EXCHANGE_CONFIG_DATA_INCOMPLETE:
 791                 zfcp_diag_update_xdata(diag_hdr, bottom, true);
 792                 req->status |= ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE;
 793
 794                 zfcp_fsf_link_down_info_eval(req,
 795                         &qtcb->header.fsf_status_qual.link_down_info);
 796
 797                 zfcp_scsi_shost_update_port_data(req->adapter, bottom);
 798                 zfcp_fsf_exchange_port_evaluate(req);
 799                 break;
 800         }
 801 }
 802
 803 static struct zfcp_fsf_req *zfcp_fsf_alloc(mempool_t *pool)
 804 {
 805         struct zfcp_fsf_req *req;
 806
 807         if (likely(pool))
 808                 req = mempool_alloc(pool, GFP_ATOMIC);
 809         else
 810                 req = kmalloc(sizeof(*req), GFP_ATOMIC);
 811
 812         if (unlikely(!req))
 813                 return NULL;
 814
 815         memset(req, 0, sizeof(*req));
 816         req->pool = pool;
 817         return req;
 818 }
 819
 820 static struct fsf_qtcb *zfcp_fsf_qtcb_alloc(mempool_t *pool)
 821 {
 822         struct fsf_qtcb *qtcb;
 823
 824         if (likely(pool))
 825                 qtcb = mempool_alloc(pool, GFP_ATOMIC);
 826         else
 827                 qtcb = kmem_cache_alloc(zfcp_fsf_qtcb_cache, GFP_ATOMIC);
 828
 829         if (unlikely(!qtcb))
 830                 return NULL;
 831
 832         memset(qtcb, 0, sizeof(*qtcb));
 833         return qtcb;
 834 }
 835
 836 static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio,
 837                                                 u32 fsf_cmd, u8 sbtype,
 838                                                 mempool_t *pool)
 839 {
 840         struct zfcp_adapter *adapter = qdio->adapter;
 841         struct zfcp_fsf_req *req = zfcp_fsf_alloc(pool);
 842
 843         if (unlikely(!req))
 844                 return ERR_PTR(-ENOMEM);
 845
 846         if (adapter->req_no == 0)
 847                 adapter->req_no++;
 848
 849         timer_setup(&req->timer, NULL, 0);
 850         init_completion(&req->completion);
 851
 852         req->adapter = adapter;
 853         req->req_id = adapter->req_no;
 854
 855         if (likely(fsf_cmd != FSF_QTCB_UNSOLICITED_STATUS)) {
 856                 if (likely(pool))
 857                         req->qtcb = zfcp_fsf_qtcb_alloc(
 858                                 adapter->pool.qtcb_pool);
 859                 else
 860                         req->qtcb = zfcp_fsf_qtcb_alloc(NULL);
 861
 862                 if (unlikely(!req->qtcb)) {
 863                         zfcp_fsf_req_free(req);
 864                         return ERR_PTR(-ENOMEM);
 865                 }
 866
 867                 req->qtcb->prefix.req_seq_no = adapter->fsf_req_seq_no;
 868                 req->qtcb->prefix.req_id = req->req_id;
 869                 req->qtcb->prefix.ulp_info = 26;
 870                 req->qtcb->prefix.qtcb_type = fsf_qtcb_type[fsf_cmd];
 871                 req->qtcb->prefix.qtcb_version = FSF_QTCB_CURRENT_VERSION;
 872                 req->qtcb->header.req_handle = req->req_id;
 873                 req->qtcb->header.fsf_command = fsf_cmd;
 874         }
 875
 876         zfcp_qdio_req_init(adapter->qdio, &req->qdio_req, req->req_id, sbtype,
 877                            req->qtcb, sizeof(struct fsf_qtcb));
 878
 879         return req;
 880 }
 881
 882 static int zfcp_fsf_req_send(struct zfcp_fsf_req *req)
 883 {
 884         const bool is_srb = zfcp_fsf_req_is_status_read_buffer(req);
 885         struct zfcp_adapter *adapter = req->adapter;
 886         struct zfcp_qdio *qdio = adapter->qdio;
 887         int req_id = req->req_id;
 888
 889         zfcp_reqlist_add(adapter->req_list, req);
 890
 891         req->qdio_req.qdio_outb_usage = atomic_read(&qdio->req_q_free);
 892         req->issued = get_tod_clock();
 893         if (zfcp_qdio_send(qdio, &req->qdio_req)) {
 894                 del_timer_sync(&req->timer);
 895                 /* lookup request again, list might have changed */
 896                 zfcp_reqlist_find_rm(adapter->req_list, req_id);
 897                 zfcp_erp_adapter_reopen(adapter, 0, "fsrs__1");
 898                 return -EIO;
 899         }
 900
 901         /*
 902          * NOTE: DO NOT TOUCH ASYNC req PAST THIS POINT.
 903          *       ONLY TOUCH SYNC req AGAIN ON req->completion.
 904          *
 905          * The request might complete and be freed concurrently at any point
 906          * now. This is not protected by the QDIO-lock (req_q_lock). So any
 907          * uncontrolled access after this might result in an use-after-free bug.
 908          * Only if the request doesn't have ZFCP_STATUS_FSFREQ_CLEANUP set, and
 909          * when it is completed via req->completion, is it safe to use req
 910          * again.
 911          */
 912
 913         /* Don't increase for unsolicited status */
 914         if (!is_srb)
 915                 adapter->fsf_req_seq_no++;
 916         adapter->req_no++;
 917
 918         return 0;
 919 }
 920
 921 /**
 922  * zfcp_fsf_status_read - send status read request
 923  * @qdio: pointer to struct zfcp_qdio
 924  * Returns: 0 on success, ERROR otherwise
 925  */
 926 int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
 927 {
 928         struct zfcp_adapter *adapter = qdio->adapter;
 929         struct zfcp_fsf_req *req;
 930         struct fsf_status_read_buffer *sr_buf;
 931         struct page *page;
 932         int retval = -EIO;
 933
 934         spin_lock_irq(&qdio->req_q_lock);
 935         if (zfcp_qdio_sbal_get(qdio))
 936                 goto out;
 937
 938         req = zfcp_fsf_req_create(qdio, FSF_QTCB_UNSOLICITED_STATUS,
 939                                   SBAL_SFLAGS0_TYPE_STATUS,
 940                                   adapter->pool.status_read_req);
 941         if (IS_ERR(req)) {
 942                 retval = PTR_ERR(req);
 943                 goto out;
 944         }
 945
 946         page = mempool_alloc(adapter->pool.sr_data, GFP_ATOMIC);
 947         if (!page) {
 948                 retval = -ENOMEM;
 949                 goto failed_buf;
 950         }
 951         sr_buf = page_address(page);
 952         memset(sr_buf, 0, sizeof(*sr_buf));
 953         req->data = sr_buf;
 954
 955         zfcp_qdio_fill_next(qdio, &req->qdio_req, sr_buf, sizeof(*sr_buf));
 956         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
 957
 958         retval = zfcp_fsf_req_send(req);
 959         if (retval)
 960                 goto failed_req_send;
 961         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
 962
 963         goto out;
 964
 965 failed_req_send:
 966         req->data = NULL;
 967         mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
 968 failed_buf:
 969         zfcp_dbf_hba_fsf_uss("fssr__1", req);
 970         zfcp_fsf_req_free(req);
 971 out:
 972         spin_unlock_irq(&qdio->req_q_lock);
 973         return retval;
 974 }
 975
 976 static void zfcp_fsf_abort_fcp_command_handler(struct zfcp_fsf_req *req)
 977 {
 978         struct scsi_device *sdev = req->data;
 979         struct zfcp_scsi_dev *zfcp_sdev;
 980         union fsf_status_qual *fsq = &req->qtcb->header.fsf_status_qual;
 981
 982         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
 983                 return;
 984
 985         zfcp_sdev = sdev_to_zfcp(sdev);
 986
 987         switch (req->qtcb->header.fsf_status) {
 988         case FSF_PORT_HANDLE_NOT_VALID:
 989                 if (fsq->word[0] == fsq->word[1]) {
 990                         zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0,
 991                                                 "fsafch1");
 992                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 993                 }
 994                 break;
 995         case FSF_LUN_HANDLE_NOT_VALID:
 996                 if (fsq->word[0] == fsq->word[1]) {
 997                         zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fsafch2");
 998                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
 999                 }
1000                 break;
1001         case FSF_FCP_COMMAND_DOES_NOT_EXIST:
1002                 req->status |= ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED;
1003                 break;
1004         case FSF_PORT_BOXED:
1005                 zfcp_erp_set_port_status(zfcp_sdev->port,
1006                                          ZFCP_STATUS_COMMON_ACCESS_BOXED);
1007                 zfcp_erp_port_reopen(zfcp_sdev->port,
1008                                      ZFCP_STATUS_COMMON_ERP_FAILED, "fsafch3");
1009                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1010                 break;
1011         case FSF_LUN_BOXED:
1012                 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ACCESS_BOXED);
1013                 zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED,
1014                                     "fsafch4");
1015                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1016                 break;
1017         case FSF_ADAPTER_STATUS_AVAILABLE:
1018                 switch (fsq->word[0]) {
1019                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1020                         zfcp_fc_test_link(zfcp_sdev->port);
1021                         fallthrough;
1022                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1023                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1024                         break;
1025                 }
1026                 break;
1027         case FSF_GOOD:
1028                 req->status |= ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED;
1029                 break;
1030         }
1031 }
1032
1033 /**
1034  * zfcp_fsf_abort_fcp_cmnd - abort running SCSI command
1035  * @scmnd: The SCSI command to abort
1036  * Returns: pointer to struct zfcp_fsf_req
1037  */
1038
1039 struct zfcp_fsf_req *zfcp_fsf_abort_fcp_cmnd(struct scsi_cmnd *scmnd)
1040 {
1041         struct zfcp_fsf_req *req = NULL;
1042         struct scsi_device *sdev = scmnd->device;
1043         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
1044         struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio;
1045         unsigned long old_req_id = (unsigned long) scmnd->host_scribble;
1046
1047         spin_lock_irq(&qdio->req_q_lock);
1048         if (zfcp_qdio_sbal_get(qdio))
1049                 goto out;
1050         req = zfcp_fsf_req_create(qdio, FSF_QTCB_ABORT_FCP_CMND,
1051                                   SBAL_SFLAGS0_TYPE_READ,
1052                                   qdio->adapter->pool.scsi_abort);
1053         if (IS_ERR(req)) {
1054                 req = NULL;
1055                 goto out;
1056         }
1057
1058         if (unlikely(!(atomic_read(&zfcp_sdev->status) &
1059                        ZFCP_STATUS_COMMON_UNBLOCKED)))
1060                 goto out_error_free;
1061
1062         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1063
1064         req->data = sdev;
1065         req->handler = zfcp_fsf_abort_fcp_command_handler;
1066         req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
1067         req->qtcb->header.port_handle = zfcp_sdev->port->handle;
1068         req->qtcb->bottom.support.req_handle = (u64) old_req_id;
1069
1070         zfcp_fsf_start_timer(req, ZFCP_FSF_SCSI_ER_TIMEOUT);
1071         if (!zfcp_fsf_req_send(req)) {
1072                 /* NOTE: DO NOT TOUCH req, UNTIL IT COMPLETES! */
1073                 goto out;
1074         }
1075
1076 out_error_free:
1077         zfcp_fsf_req_free(req);
1078         req = NULL;
1079 out:
1080         spin_unlock_irq(&qdio->req_q_lock);
1081         return req;
1082 }
1083
1084 static void zfcp_fsf_send_ct_handler(struct zfcp_fsf_req *req)
1085 {
1086         struct zfcp_adapter *adapter = req->adapter;
1087         struct zfcp_fsf_ct_els *ct = req->data;
1088         struct fsf_qtcb_header *header = &req->qtcb->header;
1089
1090         ct->status = -EINVAL;
1091
1092         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1093                 goto skip_fsfstatus;
1094
1095         switch (header->fsf_status) {
1096         case FSF_GOOD:
1097                 ct->status = 0;
1098                 zfcp_dbf_san_res("fsscth2", req);
1099                 break;
1100         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1101                 zfcp_fsf_class_not_supp(req);
1102                 break;
1103         case FSF_ADAPTER_STATUS_AVAILABLE:
1104                 switch (header->fsf_status_qual.word[0]){
1105                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1106                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1107                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1108                         break;
1109                 }
1110                 break;
1111         case FSF_PORT_BOXED:
1112                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1113                 break;
1114         case FSF_PORT_HANDLE_NOT_VALID:
1115                 zfcp_erp_adapter_reopen(adapter, 0, "fsscth1");
1116                 fallthrough;
1117         case FSF_GENERIC_COMMAND_REJECTED:
1118         case FSF_PAYLOAD_SIZE_MISMATCH:
1119         case FSF_REQUEST_SIZE_TOO_LARGE:
1120         case FSF_RESPONSE_SIZE_TOO_LARGE:
1121         case FSF_SBAL_MISMATCH:
1122                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1123                 break;
1124         }
1125
1126 skip_fsfstatus:
1127         if (ct->handler)
1128                 ct->handler(ct->handler_data);
1129 }
1130
1131 static void zfcp_fsf_setup_ct_els_unchained(struct zfcp_qdio *qdio,
1132                                             struct zfcp_qdio_req *q_req,
1133                                             struct scatterlist *sg_req,
1134                                             struct scatterlist *sg_resp)
1135 {
1136         zfcp_qdio_fill_next(qdio, q_req, sg_virt(sg_req), sg_req->length);
1137         zfcp_qdio_fill_next(qdio, q_req, sg_virt(sg_resp), sg_resp->length);
1138         zfcp_qdio_set_sbale_last(qdio, q_req);
1139 }
1140
1141 static int zfcp_fsf_setup_ct_els_sbals(struct zfcp_fsf_req *req,
1142                                        struct scatterlist *sg_req,
1143                                        struct scatterlist *sg_resp)
1144 {
1145         struct zfcp_adapter *adapter = req->adapter;
1146         struct zfcp_qdio *qdio = adapter->qdio;
1147         struct fsf_qtcb *qtcb = req->qtcb;
1148         u32 feat = adapter->adapter_features;
1149
1150         if (zfcp_adapter_multi_buffer_active(adapter)) {
1151                 if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req))
1152                         return -EIO;
1153                 qtcb->bottom.support.req_buf_length =
1154                         zfcp_qdio_real_bytes(sg_req);
1155                 if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp))
1156                         return -EIO;
1157                 qtcb->bottom.support.resp_buf_length =
1158                         zfcp_qdio_real_bytes(sg_resp);
1159
1160                 zfcp_qdio_set_data_div(qdio, &req->qdio_req, sg_nents(sg_req));
1161                 zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1162                 zfcp_qdio_set_scount(qdio, &req->qdio_req);
1163                 return 0;
1164         }
1165
1166         /* use single, unchained SBAL if it can hold the request */
1167         if (zfcp_qdio_sg_one_sbale(sg_req) && zfcp_qdio_sg_one_sbale(sg_resp)) {
1168                 zfcp_fsf_setup_ct_els_unchained(qdio, &req->qdio_req,
1169                                                 sg_req, sg_resp);
1170                 return 0;
1171         }
1172
1173         if (!(feat & FSF_FEATURE_ELS_CT_CHAINED_SBALS))
1174                 return -EOPNOTSUPP;
1175
1176         if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_req))
1177                 return -EIO;
1178
1179         qtcb->bottom.support.req_buf_length = zfcp_qdio_real_bytes(sg_req);
1180
1181         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1182         zfcp_qdio_skip_to_last_sbale(qdio, &req->qdio_req);
1183
1184         if (zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req, sg_resp))
1185                 return -EIO;
1186
1187         qtcb->bottom.support.resp_buf_length = zfcp_qdio_real_bytes(sg_resp);
1188
1189         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1190
1191         return 0;
1192 }
1193
1194 static int zfcp_fsf_setup_ct_els(struct zfcp_fsf_req *req,
1195                                  struct scatterlist *sg_req,
1196                                  struct scatterlist *sg_resp,
1197                                  unsigned int timeout)
1198 {
1199         int ret;
1200
1201         ret = zfcp_fsf_setup_ct_els_sbals(req, sg_req, sg_resp);
1202         if (ret)
1203                 return ret;
1204
1205         /* common settings for ct/gs and els requests */
1206         if (timeout > 255)
1207                 timeout = 255; /* max value accepted by hardware */
1208         req->qtcb->bottom.support.service_class = FSF_CLASS_3;
1209         req->qtcb->bottom.support.timeout = timeout;
1210         zfcp_fsf_start_timer(req, (timeout + 10) * HZ);
1211
1212         return 0;
1213 }
1214
1215 /**
1216  * zfcp_fsf_send_ct - initiate a Generic Service request (FC-GS)
1217  * @wka_port: pointer to zfcp WKA port to send CT/GS to
1218  * @ct: pointer to struct zfcp_send_ct with data for request
1219  * @pool: if non-null this mempool is used to allocate struct zfcp_fsf_req
1220  * @timeout: timeout that hardware should use, and a later software timeout
1221  */
1222 int zfcp_fsf_send_ct(struct zfcp_fc_wka_port *wka_port,
1223                      struct zfcp_fsf_ct_els *ct, mempool_t *pool,
1224                      unsigned int timeout)
1225 {
1226         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1227         struct zfcp_fsf_req *req;
1228         int ret = -EIO;
1229
1230         spin_lock_irq(&qdio->req_q_lock);
1231         if (zfcp_qdio_sbal_get(qdio))
1232                 goto out;
1233
1234         req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_GENERIC,
1235                                   SBAL_SFLAGS0_TYPE_WRITE_READ, pool);
1236
1237         if (IS_ERR(req)) {
1238                 ret = PTR_ERR(req);
1239                 goto out;
1240         }
1241
1242         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1243         ret = zfcp_fsf_setup_ct_els(req, ct->req, ct->resp, timeout);
1244         if (ret)
1245                 goto failed_send;
1246
1247         req->handler = zfcp_fsf_send_ct_handler;
1248         req->qtcb->header.port_handle = wka_port->handle;
1249         ct->d_id = wka_port->d_id;
1250         req->data = ct;
1251
1252         zfcp_dbf_san_req("fssct_1", req, wka_port->d_id);
1253
1254         ret = zfcp_fsf_req_send(req);
1255         if (ret)
1256                 goto failed_send;
1257         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
1258
1259         goto out;
1260
1261 failed_send:
1262         zfcp_fsf_req_free(req);
1263 out:
1264         spin_unlock_irq(&qdio->req_q_lock);
1265         return ret;
1266 }
1267
1268 static void zfcp_fsf_send_els_handler(struct zfcp_fsf_req *req)
1269 {
1270         struct zfcp_fsf_ct_els *send_els = req->data;
1271         struct fsf_qtcb_header *header = &req->qtcb->header;
1272
1273         send_els->status = -EINVAL;
1274
1275         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1276                 goto skip_fsfstatus;
1277
1278         switch (header->fsf_status) {
1279         case FSF_GOOD:
1280                 send_els->status = 0;
1281                 zfcp_dbf_san_res("fsselh1", req);
1282                 break;
1283         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
1284                 zfcp_fsf_class_not_supp(req);
1285                 break;
1286         case FSF_ADAPTER_STATUS_AVAILABLE:
1287                 switch (header->fsf_status_qual.word[0]){
1288                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1289                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1290                 case FSF_SQ_RETRY_IF_POSSIBLE:
1291                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1292                         break;
1293                 }
1294                 break;
1295         case FSF_ELS_COMMAND_REJECTED:
1296         case FSF_PAYLOAD_SIZE_MISMATCH:
1297         case FSF_REQUEST_SIZE_TOO_LARGE:
1298         case FSF_RESPONSE_SIZE_TOO_LARGE:
1299                 break;
1300         case FSF_SBAL_MISMATCH:
1301                 /* should never occur, avoided in zfcp_fsf_send_els */
1302                 fallthrough;
1303         default:
1304                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1305                 break;
1306         }
1307 skip_fsfstatus:
1308         if (send_els->handler)
1309                 send_els->handler(send_els->handler_data);
1310 }
1311
1312 /**
1313  * zfcp_fsf_send_els - initiate an ELS command (FC-FS)
1314  * @adapter: pointer to zfcp adapter
1315  * @d_id: N_Port_ID to send ELS to
1316  * @els: pointer to struct zfcp_send_els with data for the command
1317  * @timeout: timeout that hardware should use, and a later software timeout
1318  */
1319 int zfcp_fsf_send_els(struct zfcp_adapter *adapter, u32 d_id,
1320                       struct zfcp_fsf_ct_els *els, unsigned int timeout)
1321 {
1322         struct zfcp_fsf_req *req;
1323         struct zfcp_qdio *qdio = adapter->qdio;
1324         int ret = -EIO;
1325
1326         spin_lock_irq(&qdio->req_q_lock);
1327         if (zfcp_qdio_sbal_get(qdio))
1328                 goto out;
1329
1330         req = zfcp_fsf_req_create(qdio, FSF_QTCB_SEND_ELS,
1331                                   SBAL_SFLAGS0_TYPE_WRITE_READ, NULL);
1332
1333         if (IS_ERR(req)) {
1334                 ret = PTR_ERR(req);
1335                 goto out;
1336         }
1337
1338         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1339
1340         if (!zfcp_adapter_multi_buffer_active(adapter))
1341                 zfcp_qdio_sbal_limit(qdio, &req->qdio_req, 2);
1342
1343         ret = zfcp_fsf_setup_ct_els(req, els->req, els->resp, timeout);
1344
1345         if (ret)
1346                 goto failed_send;
1347
1348         hton24(req->qtcb->bottom.support.d_id, d_id);
1349         req->handler = zfcp_fsf_send_els_handler;
1350         els->d_id = d_id;
1351         req->data = els;
1352
1353         zfcp_dbf_san_req("fssels1", req, d_id);
1354
1355         ret = zfcp_fsf_req_send(req);
1356         if (ret)
1357                 goto failed_send;
1358         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
1359
1360         goto out;
1361
1362 failed_send:
1363         zfcp_fsf_req_free(req);
1364 out:
1365         spin_unlock_irq(&qdio->req_q_lock);
1366         return ret;
1367 }
1368
1369 int zfcp_fsf_exchange_config_data(struct zfcp_erp_action *erp_action)
1370 {
1371         struct zfcp_fsf_req *req;
1372         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1373         int retval = -EIO;
1374
1375         spin_lock_irq(&qdio->req_q_lock);
1376         if (zfcp_qdio_sbal_get(qdio))
1377                 goto out;
1378
1379         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1380                                   SBAL_SFLAGS0_TYPE_READ,
1381                                   qdio->adapter->pool.erp_req);
1382
1383         if (IS_ERR(req)) {
1384                 retval = PTR_ERR(req);
1385                 goto out;
1386         }
1387
1388         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1389         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1390
1391         req->qtcb->bottom.config.feature_selection =
1392                         FSF_FEATURE_NOTIFICATION_LOST |
1393                         FSF_FEATURE_UPDATE_ALERT |
1394                         FSF_FEATURE_REQUEST_SFP_DATA |
1395                         FSF_FEATURE_FC_SECURITY;
1396         req->erp_action = erp_action;
1397         req->handler = zfcp_fsf_exchange_config_data_handler;
1398         erp_action->fsf_req_id = req->req_id;
1399
1400         zfcp_fsf_start_erp_timer(req);
1401         retval = zfcp_fsf_req_send(req);
1402         if (retval) {
1403                 zfcp_fsf_req_free(req);
1404                 erp_action->fsf_req_id = 0;
1405         }
1406         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
1407 out:
1408         spin_unlock_irq(&qdio->req_q_lock);
1409         return retval;
1410 }
1411
1412
1413 /**
1414  * zfcp_fsf_exchange_config_data_sync() - Request information about FCP channel.
1415  * @qdio: pointer to the QDIO-Queue to use for sending the command.
1416  * @data: pointer to the QTCB-Bottom for storing the result of the command,
1417  *        might be %NULL.
1418  *
1419  * Returns:
1420  * * 0          - Exchange Config Data was successful, @data is complete
1421  * * -EIO       - Exchange Config Data was not successful, @data is invalid
1422  * * -EAGAIN    - @data contains incomplete data
1423  * * -ENOMEM    - Some memory allocation failed along the way
1424  */
1425 int zfcp_fsf_exchange_config_data_sync(struct zfcp_qdio *qdio,
1426                                        struct fsf_qtcb_bottom_config *data)
1427 {
1428         struct zfcp_fsf_req *req = NULL;
1429         int retval = -EIO;
1430
1431         spin_lock_irq(&qdio->req_q_lock);
1432         if (zfcp_qdio_sbal_get(qdio))
1433                 goto out_unlock;
1434
1435         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_CONFIG_DATA,
1436                                   SBAL_SFLAGS0_TYPE_READ, NULL);
1437
1438         if (IS_ERR(req)) {
1439                 retval = PTR_ERR(req);
1440                 goto out_unlock;
1441         }
1442
1443         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1444         req->handler = zfcp_fsf_exchange_config_data_handler;
1445
1446         req->qtcb->bottom.config.feature_selection =
1447                         FSF_FEATURE_NOTIFICATION_LOST |
1448                         FSF_FEATURE_UPDATE_ALERT |
1449                         FSF_FEATURE_REQUEST_SFP_DATA |
1450                         FSF_FEATURE_FC_SECURITY;
1451
1452         if (data)
1453                 req->data = data;
1454
1455         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1456         retval = zfcp_fsf_req_send(req);
1457         spin_unlock_irq(&qdio->req_q_lock);
1458
1459         if (!retval) {
1460                 /* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
1461                 wait_for_completion(&req->completion);
1462
1463                 if (req->status &
1464                     (ZFCP_STATUS_FSFREQ_ERROR | ZFCP_STATUS_FSFREQ_DISMISSED))
1465                         retval = -EIO;
1466                 else if (req->status & ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE)
1467                         retval = -EAGAIN;
1468         }
1469
1470         zfcp_fsf_req_free(req);
1471         return retval;
1472
1473 out_unlock:
1474         spin_unlock_irq(&qdio->req_q_lock);
1475         return retval;
1476 }
1477
1478 /**
1479  * zfcp_fsf_exchange_port_data - request information about local port
1480  * @erp_action: ERP action for the adapter for which port data is requested
1481  * Returns: 0 on success, error otherwise
1482  */
1483 int zfcp_fsf_exchange_port_data(struct zfcp_erp_action *erp_action)
1484 {
1485         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1486         struct zfcp_fsf_req *req;
1487         int retval = -EIO;
1488
1489         if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1490                 return -EOPNOTSUPP;
1491
1492         spin_lock_irq(&qdio->req_q_lock);
1493         if (zfcp_qdio_sbal_get(qdio))
1494                 goto out;
1495
1496         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA,
1497                                   SBAL_SFLAGS0_TYPE_READ,
1498                                   qdio->adapter->pool.erp_req);
1499
1500         if (IS_ERR(req)) {
1501                 retval = PTR_ERR(req);
1502                 goto out;
1503         }
1504
1505         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1506         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1507
1508         req->handler = zfcp_fsf_exchange_port_data_handler;
1509         req->erp_action = erp_action;
1510         erp_action->fsf_req_id = req->req_id;
1511
1512         zfcp_fsf_start_erp_timer(req);
1513         retval = zfcp_fsf_req_send(req);
1514         if (retval) {
1515                 zfcp_fsf_req_free(req);
1516                 erp_action->fsf_req_id = 0;
1517         }
1518         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
1519 out:
1520         spin_unlock_irq(&qdio->req_q_lock);
1521         return retval;
1522 }
1523
1524 /**
1525  * zfcp_fsf_exchange_port_data_sync() - Request information about local port.
1526  * @qdio: pointer to the QDIO-Queue to use for sending the command.
1527  * @data: pointer to the QTCB-Bottom for storing the result of the command,
1528  *        might be %NULL.
1529  *
1530  * Returns:
1531  * * 0          - Exchange Port Data was successful, @data is complete
1532  * * -EIO       - Exchange Port Data was not successful, @data is invalid
1533  * * -EAGAIN    - @data contains incomplete data
1534  * * -ENOMEM    - Some memory allocation failed along the way
1535  * * -EOPNOTSUPP        - This operation is not supported
1536  */
1537 int zfcp_fsf_exchange_port_data_sync(struct zfcp_qdio *qdio,
1538                                      struct fsf_qtcb_bottom_port *data)
1539 {
1540         struct zfcp_fsf_req *req = NULL;
1541         int retval = -EIO;
1542
1543         if (!(qdio->adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT))
1544                 return -EOPNOTSUPP;
1545
1546         spin_lock_irq(&qdio->req_q_lock);
1547         if (zfcp_qdio_sbal_get(qdio))
1548                 goto out_unlock;
1549
1550         req = zfcp_fsf_req_create(qdio, FSF_QTCB_EXCHANGE_PORT_DATA,
1551                                   SBAL_SFLAGS0_TYPE_READ, NULL);
1552
1553         if (IS_ERR(req)) {
1554                 retval = PTR_ERR(req);
1555                 goto out_unlock;
1556         }
1557
1558         if (data)
1559                 req->data = data;
1560
1561         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1562
1563         req->handler = zfcp_fsf_exchange_port_data_handler;
1564         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1565         retval = zfcp_fsf_req_send(req);
1566         spin_unlock_irq(&qdio->req_q_lock);
1567
1568         if (!retval) {
1569                 /* NOTE: ONLY TOUCH SYNC req AGAIN ON req->completion. */
1570                 wait_for_completion(&req->completion);
1571
1572                 if (req->status &
1573                     (ZFCP_STATUS_FSFREQ_ERROR | ZFCP_STATUS_FSFREQ_DISMISSED))
1574                         retval = -EIO;
1575                 else if (req->status & ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE)
1576                         retval = -EAGAIN;
1577         }
1578
1579         zfcp_fsf_req_free(req);
1580         return retval;
1581
1582 out_unlock:
1583         spin_unlock_irq(&qdio->req_q_lock);
1584         return retval;
1585 }
1586
1587 static void zfcp_fsf_log_port_fc_security(struct zfcp_port *port,
1588                                           struct zfcp_fsf_req *req)
1589 {
1590         char mnemonic_old[ZFCP_FSF_MAX_FC_SECURITY_MNEMONIC_LENGTH];
1591         char mnemonic_new[ZFCP_FSF_MAX_FC_SECURITY_MNEMONIC_LENGTH];
1592
1593         if (port->connection_info == port->connection_info_old) {
1594                 /* no change, no log nor trace */
1595                 return;
1596         }
1597
1598         zfcp_dbf_hba_fsf_fces("fsfcesp", req, port->wwpn,
1599                               port->connection_info_old,
1600                               port->connection_info);
1601
1602         zfcp_fsf_scnprint_fc_security(mnemonic_old, sizeof(mnemonic_old),
1603                                       port->connection_info_old,
1604                                       ZFCP_FSF_PRINT_FMT_SINGLEITEM);
1605         zfcp_fsf_scnprint_fc_security(mnemonic_new, sizeof(mnemonic_new),
1606                                       port->connection_info,
1607                                       ZFCP_FSF_PRINT_FMT_SINGLEITEM);
1608
1609         if (strncmp(mnemonic_old, mnemonic_new,
1610                     ZFCP_FSF_MAX_FC_SECURITY_MNEMONIC_LENGTH) == 0) {
1611                 /* no change in string representation, no log */
1612                 goto out;
1613         }
1614
1615         if (port->connection_info_old == 0) {
1616                 /* activation */
1617                 dev_info(&port->adapter->ccw_device->dev,
1618                          "FC Endpoint Security of connection to remote port 0x%16llx enabled: %s\n",
1619                          port->wwpn, mnemonic_new);
1620         } else if (port->connection_info == 0) {
1621                 /* deactivation */
1622                 dev_warn(&port->adapter->ccw_device->dev,
1623                          "FC Endpoint Security of connection to remote port 0x%16llx disabled: was %s\n",
1624                          port->wwpn, mnemonic_old);
1625         } else {
1626                 /* change */
1627                 dev_warn(&port->adapter->ccw_device->dev,
1628                          "FC Endpoint Security of connection to remote port 0x%16llx changed: from %s to %s\n",
1629                          port->wwpn, mnemonic_old, mnemonic_new);
1630         }
1631
1632 out:
1633         port->connection_info_old = port->connection_info;
1634 }
1635
1636 static void zfcp_fsf_log_security_error(const struct device *dev, u32 fsf_sqw0,
1637                                         u64 wwpn)
1638 {
1639         switch (fsf_sqw0) {
1640
1641         /*
1642          * Open Port command error codes
1643          */
1644
1645         case FSF_SQ_SECURITY_REQUIRED:
1646                 dev_warn_ratelimited(dev,
1647                                      "FC Endpoint Security error: FC security is required but not supported or configured on remote port 0x%016llx\n",
1648                                      wwpn);
1649                 break;
1650         case FSF_SQ_SECURITY_TIMEOUT:
1651                 dev_warn_ratelimited(dev,
1652                                      "FC Endpoint Security error: a timeout prevented opening remote port 0x%016llx\n",
1653                                      wwpn);
1654                 break;
1655         case FSF_SQ_SECURITY_KM_UNAVAILABLE:
1656                 dev_warn_ratelimited(dev,
1657                                      "FC Endpoint Security error: opening remote port 0x%016llx failed because local and external key manager cannot communicate\n",
1658                                      wwpn);
1659                 break;
1660         case FSF_SQ_SECURITY_RKM_UNAVAILABLE:
1661                 dev_warn_ratelimited(dev,
1662                                      "FC Endpoint Security error: opening remote port 0x%016llx failed because it cannot communicate with the external key manager\n",
1663                                      wwpn);
1664                 break;
1665         case FSF_SQ_SECURITY_AUTH_FAILURE:
1666                 dev_warn_ratelimited(dev,
1667                                      "FC Endpoint Security error: the device could not verify the identity of remote port 0x%016llx\n",
1668                                      wwpn);
1669                 break;
1670
1671         /*
1672          * Send FCP command error codes
1673          */
1674
1675         case FSF_SQ_SECURITY_ENC_FAILURE:
1676                 dev_warn_ratelimited(dev,
1677                                      "FC Endpoint Security error: FC connection to remote port 0x%016llx closed because encryption broke down\n",
1678                                      wwpn);
1679                 break;
1680
1681         /*
1682          * Unknown error codes
1683          */
1684
1685         default:
1686                 dev_warn_ratelimited(dev,
1687                                      "FC Endpoint Security error: the device issued an unknown error code 0x%08x related to the FC connection to remote port 0x%016llx\n",
1688                                      fsf_sqw0, wwpn);
1689         }
1690 }
1691
1692 static void zfcp_fsf_open_port_handler(struct zfcp_fsf_req *req)
1693 {
1694         struct zfcp_adapter *adapter = req->adapter;
1695         struct zfcp_port *port = req->data;
1696         struct fsf_qtcb_header *header = &req->qtcb->header;
1697         struct fsf_qtcb_bottom_support *bottom = &req->qtcb->bottom.support;
1698         struct fc_els_flogi *plogi;
1699
1700         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1701                 goto out;
1702
1703         switch (header->fsf_status) {
1704         case FSF_PORT_ALREADY_OPEN:
1705                 break;
1706         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1707                 dev_warn(&adapter->ccw_device->dev,
1708                          "Not enough FCP adapter resources to open "
1709                          "remote port 0x%016Lx\n",
1710                          (unsigned long long)port->wwpn);
1711                 zfcp_erp_set_port_status(port,
1712                                          ZFCP_STATUS_COMMON_ERP_FAILED);
1713                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1714                 break;
1715         case FSF_SECURITY_ERROR:
1716                 zfcp_fsf_log_security_error(&req->adapter->ccw_device->dev,
1717                                             header->fsf_status_qual.word[0],
1718                                             port->wwpn);
1719                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1720                 break;
1721         case FSF_ADAPTER_STATUS_AVAILABLE:
1722                 switch (header->fsf_status_qual.word[0]) {
1723                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
1724                         /* no zfcp_fc_test_link() with failed open port */
1725                         fallthrough;
1726                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
1727                 case FSF_SQ_NO_RETRY_POSSIBLE:
1728                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1729                         break;
1730                 }
1731                 break;
1732         case FSF_GOOD:
1733                 port->handle = header->port_handle;
1734                 if (adapter->adapter_features & FSF_FEATURE_FC_SECURITY)
1735                         port->connection_info = bottom->connection_info;
1736                 else
1737                         port->connection_info = 0;
1738                 zfcp_fsf_log_port_fc_security(port, req);
1739                 atomic_or(ZFCP_STATUS_COMMON_OPEN |
1740                                 ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
1741                 atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_BOXED,
1742                                   &port->status);
1743                 /* check whether D_ID has changed during open */
1744                 /*
1745                  * FIXME: This check is not airtight, as the FCP channel does
1746                  * not monitor closures of target port connections caused on
1747                  * the remote side. Thus, they might miss out on invalidating
1748                  * locally cached WWPNs (and other N_Port parameters) of gone
1749                  * target ports. So, our heroic attempt to make things safe
1750                  * could be undermined by 'open port' response data tagged with
1751                  * obsolete WWPNs. Another reason to monitor potential
1752                  * connection closures ourself at least (by interpreting
1753                  * incoming ELS' and unsolicited status). It just crosses my
1754                  * mind that one should be able to cross-check by means of
1755                  * another GID_PN straight after a port has been opened.
1756                  * Alternately, an ADISC/PDISC ELS should suffice, as well.
1757                  */
1758                 plogi = (struct fc_els_flogi *) bottom->els;
1759                 if (bottom->els1_length >= FSF_PLOGI_MIN_LEN)
1760                         zfcp_fc_plogi_evaluate(port, plogi);
1761                 break;
1762         case FSF_UNKNOWN_OP_SUBTYPE:
1763                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1764                 break;
1765         }
1766
1767 out:
1768         put_device(&port->dev);
1769 }
1770
1771 /**
1772  * zfcp_fsf_open_port - create and send open port request
1773  * @erp_action: pointer to struct zfcp_erp_action
1774  * Returns: 0 on success, error otherwise
1775  */
1776 int zfcp_fsf_open_port(struct zfcp_erp_action *erp_action)
1777 {
1778         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1779         struct zfcp_port *port = erp_action->port;
1780         struct zfcp_fsf_req *req;
1781         int retval = -EIO;
1782
1783         spin_lock_irq(&qdio->req_q_lock);
1784         if (zfcp_qdio_sbal_get(qdio))
1785                 goto out;
1786
1787         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
1788                                   SBAL_SFLAGS0_TYPE_READ,
1789                                   qdio->adapter->pool.erp_req);
1790
1791         if (IS_ERR(req)) {
1792                 retval = PTR_ERR(req);
1793                 goto out;
1794         }
1795
1796         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1797         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1798
1799         req->handler = zfcp_fsf_open_port_handler;
1800         hton24(req->qtcb->bottom.support.d_id, port->d_id);
1801         req->data = port;
1802         req->erp_action = erp_action;
1803         erp_action->fsf_req_id = req->req_id;
1804         get_device(&port->dev);
1805
1806         zfcp_fsf_start_erp_timer(req);
1807         retval = zfcp_fsf_req_send(req);
1808         if (retval) {
1809                 zfcp_fsf_req_free(req);
1810                 erp_action->fsf_req_id = 0;
1811                 put_device(&port->dev);
1812         }
1813         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
1814 out:
1815         spin_unlock_irq(&qdio->req_q_lock);
1816         return retval;
1817 }
1818
1819 static void zfcp_fsf_close_port_handler(struct zfcp_fsf_req *req)
1820 {
1821         struct zfcp_port *port = req->data;
1822
1823         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
1824                 return;
1825
1826         switch (req->qtcb->header.fsf_status) {
1827         case FSF_PORT_HANDLE_NOT_VALID:
1828                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscph_1");
1829                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1830                 break;
1831         case FSF_ADAPTER_STATUS_AVAILABLE:
1832                 break;
1833         case FSF_GOOD:
1834                 zfcp_erp_clear_port_status(port, ZFCP_STATUS_COMMON_OPEN);
1835                 break;
1836         }
1837 }
1838
1839 /**
1840  * zfcp_fsf_close_port - create and send close port request
1841  * @erp_action: pointer to struct zfcp_erp_action
1842  * Returns: 0 on success, error otherwise
1843  */
1844 int zfcp_fsf_close_port(struct zfcp_erp_action *erp_action)
1845 {
1846         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
1847         struct zfcp_fsf_req *req;
1848         int retval = -EIO;
1849
1850         spin_lock_irq(&qdio->req_q_lock);
1851         if (zfcp_qdio_sbal_get(qdio))
1852                 goto out;
1853
1854         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
1855                                   SBAL_SFLAGS0_TYPE_READ,
1856                                   qdio->adapter->pool.erp_req);
1857
1858         if (IS_ERR(req)) {
1859                 retval = PTR_ERR(req);
1860                 goto out;
1861         }
1862
1863         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1864         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1865
1866         req->handler = zfcp_fsf_close_port_handler;
1867         req->data = erp_action->port;
1868         req->erp_action = erp_action;
1869         req->qtcb->header.port_handle = erp_action->port->handle;
1870         erp_action->fsf_req_id = req->req_id;
1871
1872         zfcp_fsf_start_erp_timer(req);
1873         retval = zfcp_fsf_req_send(req);
1874         if (retval) {
1875                 zfcp_fsf_req_free(req);
1876                 erp_action->fsf_req_id = 0;
1877         }
1878         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
1879 out:
1880         spin_unlock_irq(&qdio->req_q_lock);
1881         return retval;
1882 }
1883
1884 static void zfcp_fsf_open_wka_port_handler(struct zfcp_fsf_req *req)
1885 {
1886         struct zfcp_fc_wka_port *wka_port = req->data;
1887         struct fsf_qtcb_header *header = &req->qtcb->header;
1888
1889         if (req->status & ZFCP_STATUS_FSFREQ_ERROR) {
1890                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
1891                 goto out;
1892         }
1893
1894         switch (header->fsf_status) {
1895         case FSF_MAXIMUM_NUMBER_OF_PORTS_EXCEEDED:
1896                 dev_warn(&req->adapter->ccw_device->dev,
1897                          "Opening WKA port 0x%x failed\n", wka_port->d_id);
1898                 fallthrough;
1899         case FSF_ADAPTER_STATUS_AVAILABLE:
1900                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1901                 wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
1902                 break;
1903         case FSF_GOOD:
1904                 wka_port->handle = header->port_handle;
1905                 fallthrough;
1906         case FSF_PORT_ALREADY_OPEN:
1907                 wka_port->status = ZFCP_FC_WKA_PORT_ONLINE;
1908         }
1909 out:
1910         wake_up(&wka_port->completion_wq);
1911 }
1912
1913 /**
1914  * zfcp_fsf_open_wka_port - create and send open wka-port request
1915  * @wka_port: pointer to struct zfcp_fc_wka_port
1916  * Returns: 0 on success, error otherwise
1917  */
1918 int zfcp_fsf_open_wka_port(struct zfcp_fc_wka_port *wka_port)
1919 {
1920         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1921         struct zfcp_fsf_req *req;
1922         unsigned long req_id = 0;
1923         int retval = -EIO;
1924
1925         spin_lock_irq(&qdio->req_q_lock);
1926         if (zfcp_qdio_sbal_get(qdio))
1927                 goto out;
1928
1929         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_PORT_WITH_DID,
1930                                   SBAL_SFLAGS0_TYPE_READ,
1931                                   qdio->adapter->pool.erp_req);
1932
1933         if (IS_ERR(req)) {
1934                 retval = PTR_ERR(req);
1935                 goto out;
1936         }
1937
1938         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1939         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1940
1941         req->handler = zfcp_fsf_open_wka_port_handler;
1942         hton24(req->qtcb->bottom.support.d_id, wka_port->d_id);
1943         req->data = wka_port;
1944
1945         req_id = req->req_id;
1946
1947         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
1948         retval = zfcp_fsf_req_send(req);
1949         if (retval)
1950                 zfcp_fsf_req_free(req);
1951         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
1952 out:
1953         spin_unlock_irq(&qdio->req_q_lock);
1954         if (!retval)
1955                 zfcp_dbf_rec_run_wka("fsowp_1", wka_port, req_id);
1956         return retval;
1957 }
1958
1959 static void zfcp_fsf_close_wka_port_handler(struct zfcp_fsf_req *req)
1960 {
1961         struct zfcp_fc_wka_port *wka_port = req->data;
1962
1963         if (req->qtcb->header.fsf_status == FSF_PORT_HANDLE_NOT_VALID) {
1964                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
1965                 zfcp_erp_adapter_reopen(wka_port->adapter, 0, "fscwph1");
1966         }
1967
1968         wka_port->status = ZFCP_FC_WKA_PORT_OFFLINE;
1969         wake_up(&wka_port->completion_wq);
1970 }
1971
1972 /**
1973  * zfcp_fsf_close_wka_port - create and send close wka port request
1974  * @wka_port: WKA port to open
1975  * Returns: 0 on success, error otherwise
1976  */
1977 int zfcp_fsf_close_wka_port(struct zfcp_fc_wka_port *wka_port)
1978 {
1979         struct zfcp_qdio *qdio = wka_port->adapter->qdio;
1980         struct zfcp_fsf_req *req;
1981         unsigned long req_id = 0;
1982         int retval = -EIO;
1983
1984         spin_lock_irq(&qdio->req_q_lock);
1985         if (zfcp_qdio_sbal_get(qdio))
1986                 goto out;
1987
1988         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PORT,
1989                                   SBAL_SFLAGS0_TYPE_READ,
1990                                   qdio->adapter->pool.erp_req);
1991
1992         if (IS_ERR(req)) {
1993                 retval = PTR_ERR(req);
1994                 goto out;
1995         }
1996
1997         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
1998         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
1999
2000         req->handler = zfcp_fsf_close_wka_port_handler;
2001         req->data = wka_port;
2002         req->qtcb->header.port_handle = wka_port->handle;
2003
2004         req_id = req->req_id;
2005
2006         zfcp_fsf_start_timer(req, ZFCP_FSF_REQUEST_TIMEOUT);
2007         retval = zfcp_fsf_req_send(req);
2008         if (retval)
2009                 zfcp_fsf_req_free(req);
2010         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
2011 out:
2012         spin_unlock_irq(&qdio->req_q_lock);
2013         if (!retval)
2014                 zfcp_dbf_rec_run_wka("fscwp_1", wka_port, req_id);
2015         return retval;
2016 }
2017
2018 static void zfcp_fsf_close_physical_port_handler(struct zfcp_fsf_req *req)
2019 {
2020         struct zfcp_port *port = req->data;
2021         struct fsf_qtcb_header *header = &req->qtcb->header;
2022         struct scsi_device *sdev;
2023
2024         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
2025                 return;
2026
2027         switch (header->fsf_status) {
2028         case FSF_PORT_HANDLE_NOT_VALID:
2029                 zfcp_erp_adapter_reopen(port->adapter, 0, "fscpph1");
2030                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2031                 break;
2032         case FSF_PORT_BOXED:
2033                 /* can't use generic zfcp_erp_modify_port_status because
2034                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port */
2035                 atomic_andnot(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2036                 shost_for_each_device(sdev, port->adapter->scsi_host)
2037                         if (sdev_to_zfcp(sdev)->port == port)
2038                                 atomic_andnot(ZFCP_STATUS_COMMON_OPEN,
2039                                                   &sdev_to_zfcp(sdev)->status);
2040                 zfcp_erp_set_port_status(port, ZFCP_STATUS_COMMON_ACCESS_BOXED);
2041                 zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED,
2042                                      "fscpph2");
2043                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2044                 break;
2045         case FSF_ADAPTER_STATUS_AVAILABLE:
2046                 switch (header->fsf_status_qual.word[0]) {
2047                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2048                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2049                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2050                         break;
2051                 }
2052                 break;
2053         case FSF_GOOD:
2054                 /* can't use generic zfcp_erp_modify_port_status because
2055                  * ZFCP_STATUS_COMMON_OPEN must not be reset for the port
2056                  */
2057                 atomic_andnot(ZFCP_STATUS_PORT_PHYS_OPEN, &port->status);
2058                 shost_for_each_device(sdev, port->adapter->scsi_host)
2059                         if (sdev_to_zfcp(sdev)->port == port)
2060                                 atomic_andnot(ZFCP_STATUS_COMMON_OPEN,
2061                                                   &sdev_to_zfcp(sdev)->status);
2062                 break;
2063         }
2064 }
2065
2066 /**
2067  * zfcp_fsf_close_physical_port - close physical port
2068  * @erp_action: pointer to struct zfcp_erp_action
2069  * Returns: 0 on success
2070  */
2071 int zfcp_fsf_close_physical_port(struct zfcp_erp_action *erp_action)
2072 {
2073         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
2074         struct zfcp_fsf_req *req;
2075         int retval = -EIO;
2076
2077         spin_lock_irq(&qdio->req_q_lock);
2078         if (zfcp_qdio_sbal_get(qdio))
2079                 goto out;
2080
2081         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_PHYSICAL_PORT,
2082                                   SBAL_SFLAGS0_TYPE_READ,
2083                                   qdio->adapter->pool.erp_req);
2084
2085         if (IS_ERR(req)) {
2086                 retval = PTR_ERR(req);
2087                 goto out;
2088         }
2089
2090         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2091         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
2092
2093         req->data = erp_action->port;
2094         req->qtcb->header.port_handle = erp_action->port->handle;
2095         req->erp_action = erp_action;
2096         req->handler = zfcp_fsf_close_physical_port_handler;
2097         erp_action->fsf_req_id = req->req_id;
2098
2099         zfcp_fsf_start_erp_timer(req);
2100         retval = zfcp_fsf_req_send(req);
2101         if (retval) {
2102                 zfcp_fsf_req_free(req);
2103                 erp_action->fsf_req_id = 0;
2104         }
2105         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
2106 out:
2107         spin_unlock_irq(&qdio->req_q_lock);
2108         return retval;
2109 }
2110
2111 static void zfcp_fsf_open_lun_handler(struct zfcp_fsf_req *req)
2112 {
2113         struct zfcp_adapter *adapter = req->adapter;
2114         struct scsi_device *sdev = req->data;
2115         struct zfcp_scsi_dev *zfcp_sdev;
2116         struct fsf_qtcb_header *header = &req->qtcb->header;
2117         union fsf_status_qual *qual = &header->fsf_status_qual;
2118
2119         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
2120                 return;
2121
2122         zfcp_sdev = sdev_to_zfcp(sdev);
2123
2124         atomic_andnot(ZFCP_STATUS_COMMON_ACCESS_DENIED |
2125                           ZFCP_STATUS_COMMON_ACCESS_BOXED,
2126                           &zfcp_sdev->status);
2127
2128         switch (header->fsf_status) {
2129
2130         case FSF_PORT_HANDLE_NOT_VALID:
2131                 zfcp_erp_adapter_reopen(adapter, 0, "fsouh_1");
2132                 fallthrough;
2133         case FSF_LUN_ALREADY_OPEN:
2134                 break;
2135         case FSF_PORT_BOXED:
2136                 zfcp_erp_set_port_status(zfcp_sdev->port,
2137                                          ZFCP_STATUS_COMMON_ACCESS_BOXED);
2138                 zfcp_erp_port_reopen(zfcp_sdev->port,
2139                                      ZFCP_STATUS_COMMON_ERP_FAILED, "fsouh_2");
2140                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2141                 break;
2142         case FSF_LUN_SHARING_VIOLATION:
2143                 if (qual->word[0])
2144                         dev_warn(&zfcp_sdev->port->adapter->ccw_device->dev,
2145                                  "LUN 0x%016Lx on port 0x%016Lx is already in "
2146                                  "use by CSS%d, MIF Image ID %x\n",
2147                                  zfcp_scsi_dev_lun(sdev),
2148                                  (unsigned long long)zfcp_sdev->port->wwpn,
2149                                  qual->fsf_queue_designator.cssid,
2150                                  qual->fsf_queue_designator.hla);
2151                 zfcp_erp_set_lun_status(sdev,
2152                                         ZFCP_STATUS_COMMON_ERP_FAILED |
2153                                         ZFCP_STATUS_COMMON_ACCESS_DENIED);
2154                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2155                 break;
2156         case FSF_MAXIMUM_NUMBER_OF_LUNS_EXCEEDED:
2157                 dev_warn(&adapter->ccw_device->dev,
2158                          "No handle is available for LUN "
2159                          "0x%016Lx on port 0x%016Lx\n",
2160                          (unsigned long long)zfcp_scsi_dev_lun(sdev),
2161                          (unsigned long long)zfcp_sdev->port->wwpn);
2162                 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ERP_FAILED);
2163                 fallthrough;
2164         case FSF_INVALID_COMMAND_OPTION:
2165                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2166                 break;
2167         case FSF_ADAPTER_STATUS_AVAILABLE:
2168                 switch (header->fsf_status_qual.word[0]) {
2169                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2170                         zfcp_fc_test_link(zfcp_sdev->port);
2171                         fallthrough;
2172                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2173                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2174                         break;
2175                 }
2176                 break;
2177
2178         case FSF_GOOD:
2179                 zfcp_sdev->lun_handle = header->lun_handle;
2180                 atomic_or(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status);
2181                 break;
2182         }
2183 }
2184
2185 /**
2186  * zfcp_fsf_open_lun - open LUN
2187  * @erp_action: pointer to struct zfcp_erp_action
2188  * Returns: 0 on success, error otherwise
2189  */
2190 int zfcp_fsf_open_lun(struct zfcp_erp_action *erp_action)
2191 {
2192         struct zfcp_adapter *adapter = erp_action->adapter;
2193         struct zfcp_qdio *qdio = adapter->qdio;
2194         struct zfcp_fsf_req *req;
2195         int retval = -EIO;
2196
2197         spin_lock_irq(&qdio->req_q_lock);
2198         if (zfcp_qdio_sbal_get(qdio))
2199                 goto out;
2200
2201         req = zfcp_fsf_req_create(qdio, FSF_QTCB_OPEN_LUN,
2202                                   SBAL_SFLAGS0_TYPE_READ,
2203                                   adapter->pool.erp_req);
2204
2205         if (IS_ERR(req)) {
2206                 retval = PTR_ERR(req);
2207                 goto out;
2208         }
2209
2210         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2211         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
2212
2213         req->qtcb->header.port_handle = erp_action->port->handle;
2214         req->qtcb->bottom.support.fcp_lun = zfcp_scsi_dev_lun(erp_action->sdev);
2215         req->handler = zfcp_fsf_open_lun_handler;
2216         req->data = erp_action->sdev;
2217         req->erp_action = erp_action;
2218         erp_action->fsf_req_id = req->req_id;
2219
2220         if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE))
2221                 req->qtcb->bottom.support.option = FSF_OPEN_LUN_SUPPRESS_BOXING;
2222
2223         zfcp_fsf_start_erp_timer(req);
2224         retval = zfcp_fsf_req_send(req);
2225         if (retval) {
2226                 zfcp_fsf_req_free(req);
2227                 erp_action->fsf_req_id = 0;
2228         }
2229         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
2230 out:
2231         spin_unlock_irq(&qdio->req_q_lock);
2232         return retval;
2233 }
2234
2235 static void zfcp_fsf_close_lun_handler(struct zfcp_fsf_req *req)
2236 {
2237         struct scsi_device *sdev = req->data;
2238         struct zfcp_scsi_dev *zfcp_sdev;
2239
2240         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
2241                 return;
2242
2243         zfcp_sdev = sdev_to_zfcp(sdev);
2244
2245         switch (req->qtcb->header.fsf_status) {
2246         case FSF_PORT_HANDLE_NOT_VALID:
2247                 zfcp_erp_adapter_reopen(zfcp_sdev->port->adapter, 0, "fscuh_1");
2248                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2249                 break;
2250         case FSF_LUN_HANDLE_NOT_VALID:
2251                 zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fscuh_2");
2252                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2253                 break;
2254         case FSF_PORT_BOXED:
2255                 zfcp_erp_set_port_status(zfcp_sdev->port,
2256                                          ZFCP_STATUS_COMMON_ACCESS_BOXED);
2257                 zfcp_erp_port_reopen(zfcp_sdev->port,
2258                                      ZFCP_STATUS_COMMON_ERP_FAILED, "fscuh_3");
2259                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2260                 break;
2261         case FSF_ADAPTER_STATUS_AVAILABLE:
2262                 switch (req->qtcb->header.fsf_status_qual.word[0]) {
2263                 case FSF_SQ_INVOKE_LINK_TEST_PROCEDURE:
2264                         zfcp_fc_test_link(zfcp_sdev->port);
2265                         fallthrough;
2266                 case FSF_SQ_ULP_DEPENDENT_ERP_REQUIRED:
2267                         req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2268                         break;
2269                 }
2270                 break;
2271         case FSF_GOOD:
2272                 atomic_andnot(ZFCP_STATUS_COMMON_OPEN, &zfcp_sdev->status);
2273                 break;
2274         }
2275 }
2276
2277 /**
2278  * zfcp_fsf_close_lun - close LUN
2279  * @erp_action: pointer to erp_action triggering the "close LUN"
2280  * Returns: 0 on success, error otherwise
2281  */
2282 int zfcp_fsf_close_lun(struct zfcp_erp_action *erp_action)
2283 {
2284         struct zfcp_qdio *qdio = erp_action->adapter->qdio;
2285         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(erp_action->sdev);
2286         struct zfcp_fsf_req *req;
2287         int retval = -EIO;
2288
2289         spin_lock_irq(&qdio->req_q_lock);
2290         if (zfcp_qdio_sbal_get(qdio))
2291                 goto out;
2292
2293         req = zfcp_fsf_req_create(qdio, FSF_QTCB_CLOSE_LUN,
2294                                   SBAL_SFLAGS0_TYPE_READ,
2295                                   qdio->adapter->pool.erp_req);
2296
2297         if (IS_ERR(req)) {
2298                 retval = PTR_ERR(req);
2299                 goto out;
2300         }
2301
2302         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2303         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
2304
2305         req->qtcb->header.port_handle = erp_action->port->handle;
2306         req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
2307         req->handler = zfcp_fsf_close_lun_handler;
2308         req->data = erp_action->sdev;
2309         req->erp_action = erp_action;
2310         erp_action->fsf_req_id = req->req_id;
2311
2312         zfcp_fsf_start_erp_timer(req);
2313         retval = zfcp_fsf_req_send(req);
2314         if (retval) {
2315                 zfcp_fsf_req_free(req);
2316                 erp_action->fsf_req_id = 0;
2317         }
2318         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
2319 out:
2320         spin_unlock_irq(&qdio->req_q_lock);
2321         return retval;
2322 }
2323
2324 static void zfcp_fsf_update_lat(struct zfcp_latency_record *lat_rec, u32 lat)
2325 {
2326         lat_rec->sum += lat;
2327         lat_rec->min = min(lat_rec->min, lat);
2328         lat_rec->max = max(lat_rec->max, lat);
2329 }
2330
2331 static void zfcp_fsf_req_trace(struct zfcp_fsf_req *req, struct scsi_cmnd *scsi)
2332 {
2333         struct fsf_qual_latency_info *lat_in;
2334         struct zfcp_latency_cont *lat = NULL;
2335         struct zfcp_scsi_dev *zfcp_sdev;
2336         struct zfcp_blk_drv_data blktrc;
2337         int ticks = req->adapter->timer_ticks;
2338
2339         lat_in = &req->qtcb->prefix.prot_status_qual.latency_info;
2340
2341         blktrc.flags = 0;
2342         blktrc.magic = ZFCP_BLK_DRV_DATA_MAGIC;
2343         if (req->status & ZFCP_STATUS_FSFREQ_ERROR)
2344                 blktrc.flags |= ZFCP_BLK_REQ_ERROR;
2345         blktrc.inb_usage = 0;
2346         blktrc.outb_usage = req->qdio_req.qdio_outb_usage;
2347
2348         if (req->adapter->adapter_features & FSF_FEATURE_MEASUREMENT_DATA &&
2349             !(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2350                 zfcp_sdev = sdev_to_zfcp(scsi->device);
2351                 blktrc.flags |= ZFCP_BLK_LAT_VALID;
2352                 blktrc.channel_lat = lat_in->channel_lat * ticks;
2353                 blktrc.fabric_lat = lat_in->fabric_lat * ticks;
2354
2355                 switch (req->qtcb->bottom.io.data_direction) {
2356                 case FSF_DATADIR_DIF_READ_STRIP:
2357                 case FSF_DATADIR_DIF_READ_CONVERT:
2358                 case FSF_DATADIR_READ:
2359                         lat = &zfcp_sdev->latencies.read;
2360                         break;
2361                 case FSF_DATADIR_DIF_WRITE_INSERT:
2362                 case FSF_DATADIR_DIF_WRITE_CONVERT:
2363                 case FSF_DATADIR_WRITE:
2364                         lat = &zfcp_sdev->latencies.write;
2365                         break;
2366                 case FSF_DATADIR_CMND:
2367                         lat = &zfcp_sdev->latencies.cmd;
2368                         break;
2369                 }
2370
2371                 if (lat) {
2372                         spin_lock(&zfcp_sdev->latencies.lock);
2373                         zfcp_fsf_update_lat(&lat->channel, lat_in->channel_lat);
2374                         zfcp_fsf_update_lat(&lat->fabric, lat_in->fabric_lat);
2375                         lat->counter++;
2376                         spin_unlock(&zfcp_sdev->latencies.lock);
2377                 }
2378         }
2379
2380         blk_add_driver_data(scsi_cmd_to_rq(scsi), &blktrc, sizeof(blktrc));
2381 }
2382
2383 /**
2384  * zfcp_fsf_fcp_handler_common() - FCP response handler common to I/O and TMF.
2385  * @req: Pointer to FSF request.
2386  * @sdev: Pointer to SCSI device as request context.
2387  */
2388 static void zfcp_fsf_fcp_handler_common(struct zfcp_fsf_req *req,
2389                                         struct scsi_device *sdev)
2390 {
2391         struct zfcp_scsi_dev *zfcp_sdev;
2392         struct fsf_qtcb_header *header = &req->qtcb->header;
2393
2394         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR))
2395                 return;
2396
2397         zfcp_sdev = sdev_to_zfcp(sdev);
2398
2399         switch (header->fsf_status) {
2400         case FSF_HANDLE_MISMATCH:
2401         case FSF_PORT_HANDLE_NOT_VALID:
2402                 zfcp_erp_adapter_reopen(req->adapter, 0, "fssfch1");
2403                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2404                 break;
2405         case FSF_FCPLUN_NOT_VALID:
2406         case FSF_LUN_HANDLE_NOT_VALID:
2407                 zfcp_erp_port_reopen(zfcp_sdev->port, 0, "fssfch2");
2408                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2409                 break;
2410         case FSF_SERVICE_CLASS_NOT_SUPPORTED:
2411                 zfcp_fsf_class_not_supp(req);
2412                 break;
2413         case FSF_DIRECTION_INDICATOR_NOT_VALID:
2414                 dev_err(&req->adapter->ccw_device->dev,
2415                         "Incorrect direction %d, LUN 0x%016Lx on port "
2416                         "0x%016Lx closed\n",
2417                         req->qtcb->bottom.io.data_direction,
2418                         (unsigned long long)zfcp_scsi_dev_lun(sdev),
2419                         (unsigned long long)zfcp_sdev->port->wwpn);
2420                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fssfch3");
2421                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2422                 break;
2423         case FSF_CMND_LENGTH_NOT_VALID:
2424                 dev_err(&req->adapter->ccw_device->dev,
2425                         "Incorrect FCP_CMND length %d, FCP device closed\n",
2426                         req->qtcb->bottom.io.fcp_cmnd_length);
2427                 zfcp_erp_adapter_shutdown(req->adapter, 0, "fssfch4");
2428                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2429                 break;
2430         case FSF_PORT_BOXED:
2431                 zfcp_erp_set_port_status(zfcp_sdev->port,
2432                                          ZFCP_STATUS_COMMON_ACCESS_BOXED);
2433                 zfcp_erp_port_reopen(zfcp_sdev->port,
2434                                      ZFCP_STATUS_COMMON_ERP_FAILED, "fssfch5");
2435                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2436                 break;
2437         case FSF_LUN_BOXED:
2438                 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_ACCESS_BOXED);
2439                 zfcp_erp_lun_reopen(sdev, ZFCP_STATUS_COMMON_ERP_FAILED,
2440                                     "fssfch6");
2441                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2442                 break;
2443         case FSF_ADAPTER_STATUS_AVAILABLE:
2444                 if (header->fsf_status_qual.word[0] ==
2445                     FSF_SQ_INVOKE_LINK_TEST_PROCEDURE)
2446                         zfcp_fc_test_link(zfcp_sdev->port);
2447                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2448                 break;
2449         case FSF_SECURITY_ERROR:
2450                 zfcp_fsf_log_security_error(&req->adapter->ccw_device->dev,
2451                                             header->fsf_status_qual.word[0],
2452                                             zfcp_sdev->port->wwpn);
2453                 zfcp_erp_port_forced_reopen(zfcp_sdev->port, 0, "fssfch7");
2454                 req->status |= ZFCP_STATUS_FSFREQ_ERROR;
2455                 break;
2456         }
2457 }
2458
2459 static void zfcp_fsf_fcp_cmnd_handler(struct zfcp_fsf_req *req)
2460 {
2461         struct scsi_cmnd *scpnt;
2462         struct fcp_resp_with_ext *fcp_rsp;
2463         unsigned long flags;
2464
2465         read_lock_irqsave(&req->adapter->abort_lock, flags);
2466
2467         scpnt = req->data;
2468         if (unlikely(!scpnt)) {
2469                 read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2470                 return;
2471         }
2472
2473         zfcp_fsf_fcp_handler_common(req, scpnt->device);
2474
2475         if (unlikely(req->status & ZFCP_STATUS_FSFREQ_ERROR)) {
2476                 set_host_byte(scpnt, DID_TRANSPORT_DISRUPTED);
2477                 goto skip_fsfstatus;
2478         }
2479
2480         switch (req->qtcb->header.fsf_status) {
2481         case FSF_INCONSISTENT_PROT_DATA:
2482         case FSF_INVALID_PROT_PARM:
2483                 set_host_byte(scpnt, DID_ERROR);
2484                 goto skip_fsfstatus;
2485         case FSF_BLOCK_GUARD_CHECK_FAILURE:
2486                 zfcp_scsi_dif_sense_error(scpnt, 0x1);
2487                 goto skip_fsfstatus;
2488         case FSF_APP_TAG_CHECK_FAILURE:
2489                 zfcp_scsi_dif_sense_error(scpnt, 0x2);
2490                 goto skip_fsfstatus;
2491         case FSF_REF_TAG_CHECK_FAILURE:
2492                 zfcp_scsi_dif_sense_error(scpnt, 0x3);
2493                 goto skip_fsfstatus;
2494         }
2495         BUILD_BUG_ON(sizeof(struct fcp_resp_with_ext) > FSF_FCP_RSP_SIZE);
2496         fcp_rsp = &req->qtcb->bottom.io.fcp_rsp.iu;
2497         zfcp_fc_eval_fcp_rsp(fcp_rsp, scpnt);
2498
2499 skip_fsfstatus:
2500         zfcp_fsf_req_trace(req, scpnt);
2501         zfcp_dbf_scsi_result(scpnt, req);
2502
2503         scpnt->host_scribble = NULL;
2504         (scpnt->scsi_done) (scpnt);
2505         /*
2506          * We must hold this lock until scsi_done has been called.
2507          * Otherwise we may call scsi_done after abort regarding this
2508          * command has completed.
2509          * Note: scsi_done must not block!
2510          */
2511         read_unlock_irqrestore(&req->adapter->abort_lock, flags);
2512 }
2513
2514 static int zfcp_fsf_set_data_dir(struct scsi_cmnd *scsi_cmnd, u32 *data_dir)
2515 {
2516         switch (scsi_get_prot_op(scsi_cmnd)) {
2517         case SCSI_PROT_NORMAL:
2518                 switch (scsi_cmnd->sc_data_direction) {
2519                 case DMA_NONE:
2520                         *data_dir = FSF_DATADIR_CMND;
2521                         break;
2522                 case DMA_FROM_DEVICE:
2523                         *data_dir = FSF_DATADIR_READ;
2524                         break;
2525                 case DMA_TO_DEVICE:
2526                         *data_dir = FSF_DATADIR_WRITE;
2527                         break;
2528                 case DMA_BIDIRECTIONAL:
2529                         return -EINVAL;
2530                 }
2531                 break;
2532
2533         case SCSI_PROT_READ_STRIP:
2534                 *data_dir = FSF_DATADIR_DIF_READ_STRIP;
2535                 break;
2536         case SCSI_PROT_WRITE_INSERT:
2537                 *data_dir = FSF_DATADIR_DIF_WRITE_INSERT;
2538                 break;
2539         case SCSI_PROT_READ_PASS:
2540                 *data_dir = FSF_DATADIR_DIF_READ_CONVERT;
2541                 break;
2542         case SCSI_PROT_WRITE_PASS:
2543                 *data_dir = FSF_DATADIR_DIF_WRITE_CONVERT;
2544                 break;
2545         default:
2546                 return -EINVAL;
2547         }
2548
2549         return 0;
2550 }
2551
2552 /**
2553  * zfcp_fsf_fcp_cmnd - initiate an FCP command (for a SCSI command)
2554  * @scsi_cmnd: scsi command to be sent
2555  */
2556 int zfcp_fsf_fcp_cmnd(struct scsi_cmnd *scsi_cmnd)
2557 {
2558         struct zfcp_fsf_req *req;
2559         struct fcp_cmnd *fcp_cmnd;
2560         u8 sbtype = SBAL_SFLAGS0_TYPE_READ;
2561         int retval = -EIO;
2562         struct scsi_device *sdev = scsi_cmnd->device;
2563         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
2564         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
2565         struct zfcp_qdio *qdio = adapter->qdio;
2566         struct fsf_qtcb_bottom_io *io;
2567         unsigned long flags;
2568
2569         if (unlikely(!(atomic_read(&zfcp_sdev->status) &
2570                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2571                 return -EBUSY;
2572
2573         spin_lock_irqsave(&qdio->req_q_lock, flags);
2574         if (atomic_read(&qdio->req_q_free) <= 0) {
2575                 atomic_inc(&qdio->req_q_full);
2576                 goto out;
2577         }
2578
2579         if (scsi_cmnd->sc_data_direction == DMA_TO_DEVICE)
2580                 sbtype = SBAL_SFLAGS0_TYPE_WRITE;
2581
2582         req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
2583                                   sbtype, adapter->pool.scsi_req);
2584
2585         if (IS_ERR(req)) {
2586                 retval = PTR_ERR(req);
2587                 goto out;
2588         }
2589
2590         scsi_cmnd->host_scribble = (unsigned char *) req->req_id;
2591
2592         io = &req->qtcb->bottom.io;
2593         req->status |= ZFCP_STATUS_FSFREQ_CLEANUP;
2594         req->data = scsi_cmnd;
2595         req->handler = zfcp_fsf_fcp_cmnd_handler;
2596         req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
2597         req->qtcb->header.port_handle = zfcp_sdev->port->handle;
2598         io->service_class = FSF_CLASS_3;
2599         io->fcp_cmnd_length = FCP_CMND_LEN;
2600
2601         if (scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) {
2602                 io->data_block_length = scsi_prot_interval(scsi_cmnd);
2603                 io->ref_tag_value = scsi_prot_ref_tag(scsi_cmnd);
2604         }
2605
2606         if (zfcp_fsf_set_data_dir(scsi_cmnd, &io->data_direction))
2607                 goto failed_scsi_cmnd;
2608
2609         BUILD_BUG_ON(sizeof(struct fcp_cmnd) > FSF_FCP_CMND_SIZE);
2610         fcp_cmnd = &req->qtcb->bottom.io.fcp_cmnd.iu;
2611         zfcp_fc_scsi_to_fcp(fcp_cmnd, scsi_cmnd);
2612
2613         if ((scsi_get_prot_op(scsi_cmnd) != SCSI_PROT_NORMAL) &&
2614             scsi_prot_sg_count(scsi_cmnd)) {
2615                 zfcp_qdio_set_data_div(qdio, &req->qdio_req,
2616                                        scsi_prot_sg_count(scsi_cmnd));
2617                 retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
2618                                                  scsi_prot_sglist(scsi_cmnd));
2619                 if (retval)
2620                         goto failed_scsi_cmnd;
2621                 io->prot_data_length = zfcp_qdio_real_bytes(
2622                                                 scsi_prot_sglist(scsi_cmnd));
2623         }
2624
2625         retval = zfcp_qdio_sbals_from_sg(qdio, &req->qdio_req,
2626                                          scsi_sglist(scsi_cmnd));
2627         if (unlikely(retval))
2628                 goto failed_scsi_cmnd;
2629
2630         zfcp_qdio_set_sbale_last(adapter->qdio, &req->qdio_req);
2631         if (zfcp_adapter_multi_buffer_active(adapter))
2632                 zfcp_qdio_set_scount(qdio, &req->qdio_req);
2633
2634         retval = zfcp_fsf_req_send(req);
2635         if (unlikely(retval))
2636                 goto failed_scsi_cmnd;
2637         /* NOTE: DO NOT TOUCH req PAST THIS POINT! */
2638
2639         goto out;
2640
2641 failed_scsi_cmnd:
2642         zfcp_fsf_req_free(req);
2643         scsi_cmnd->host_scribble = NULL;
2644 out:
2645         spin_unlock_irqrestore(&qdio->req_q_lock, flags);
2646         return retval;
2647 }
2648
2649 static void zfcp_fsf_fcp_task_mgmt_handler(struct zfcp_fsf_req *req)
2650 {
2651         struct scsi_device *sdev = req->data;
2652         struct fcp_resp_with_ext *fcp_rsp;
2653         struct fcp_resp_rsp_info *rsp_info;
2654
2655         zfcp_fsf_fcp_handler_common(req, sdev);
2656
2657         fcp_rsp = &req->qtcb->bottom.io.fcp_rsp.iu;
2658         rsp_info = (struct fcp_resp_rsp_info *) &fcp_rsp[1];
2659
2660         if ((rsp_info->rsp_code != FCP_TMF_CMPL) ||
2661              (req->status & ZFCP_STATUS_FSFREQ_ERROR))
2662                 req->status |= ZFCP_STATUS_FSFREQ_TMFUNCFAILED;
2663 }
2664
2665 /**
2666  * zfcp_fsf_fcp_task_mgmt() - Send SCSI task management command (TMF).
2667  * @sdev: Pointer to SCSI device to send the task management command to.
2668  * @tm_flags: Unsigned byte for task management flags.
2669  *
2670  * Return: On success pointer to struct zfcp_fsf_req, %NULL otherwise.
2671  */
2672 struct zfcp_fsf_req *zfcp_fsf_fcp_task_mgmt(struct scsi_device *sdev,
2673                                             u8 tm_flags)
2674 {
2675         struct zfcp_fsf_req *req = NULL;
2676         struct fcp_cmnd *fcp_cmnd;
2677         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
2678         struct zfcp_qdio *qdio = zfcp_sdev->port->adapter->qdio;
2679
2680         if (unlikely(!(atomic_read(&zfcp_sdev->status) &
2681                        ZFCP_STATUS_COMMON_UNBLOCKED)))
2682                 return NULL;
2683
2684         spin_lock_irq(&qdio->req_q_lock);
2685         if (zfcp_qdio_sbal_get(qdio))
2686                 goto out;
2687
2688         req = zfcp_fsf_req_create(qdio, FSF_QTCB_FCP_CMND,
2689                                   SBAL_SFLAGS0_TYPE_WRITE,
2690                                   qdio->adapter->pool.scsi_req);
2691
2692         if (IS_ERR(req)) {
2693                 req = NULL;
2694                 goto out;
2695         }
2696
2697         req->data = sdev;
2698
2699         req->handler = zfcp_fsf_fcp_task_mgmt_handler;
2700         req->qtcb->header.lun_handle = zfcp_sdev->lun_handle;
2701         req->qtcb->header.port_handle = zfcp_sdev->port->handle;
2702         req->qtcb->bottom.io.data_direction = FSF_DATADIR_CMND;
2703         req->qtcb->bottom.io.service_class = FSF_CLASS_3;
2704         req->qtcb->bottom.io.fcp_cmnd_length = FCP_CMND_LEN;
2705
2706         zfcp_qdio_set_sbale_last(qdio, &req->qdio_req);
2707
2708         fcp_cmnd = &req->qtcb->bottom.io.fcp_cmnd.iu;
2709         zfcp_fc_fcp_tm(fcp_cmnd, sdev, tm_flags);
2710
2711         zfcp_fsf_start_timer(req, ZFCP_FSF_SCSI_ER_TIMEOUT);
2712         if (!zfcp_fsf_req_send(req)) {
2713                 /* NOTE: DO NOT TOUCH req, UNTIL IT COMPLETES! */
2714                 goto out;
2715         }
2716
2717         zfcp_fsf_req_free(req);
2718         req = NULL;
2719 out:
2720         spin_unlock_irq(&qdio->req_q_lock);
2721         return req;
2722 }
2723
2724 /**
2725  * zfcp_fsf_reqid_check - validate req_id contained in SBAL returned by QDIO
2726  * @qdio: pointer to struct zfcp_qdio
2727  * @sbal_idx: response queue index of SBAL to be processed
2728  */
2729 void zfcp_fsf_reqid_check(struct zfcp_qdio *qdio, int sbal_idx)
2730 {
2731         struct zfcp_adapter *adapter = qdio->adapter;
2732         struct qdio_buffer *sbal = qdio->res_q[sbal_idx];
2733         struct qdio_buffer_element *sbale;
2734         struct zfcp_fsf_req *fsf_req;
2735         unsigned long req_id;
2736         int idx;
2737
2738         for (idx = 0; idx < QDIO_MAX_ELEMENTS_PER_BUFFER; idx++) {
2739
2740                 sbale = &sbal->element[idx];
2741                 req_id = sbale->addr;
2742                 fsf_req = zfcp_reqlist_find_rm(adapter->req_list, req_id);
2743
2744                 if (!fsf_req) {
2745                         /*
2746                          * Unknown request means that we have potentially memory
2747                          * corruption and must stop the machine immediately.
2748                          */
2749                         zfcp_qdio_siosl(adapter);
2750                         panic("error: unknown req_id (%lx) on adapter %s.\n",
2751                               req_id, dev_name(&adapter->ccw_device->dev));
2752                 }
2753
2754                 zfcp_fsf_req_complete(fsf_req);
2755
2756                 if (likely(sbale->eflags & SBAL_EFLAGS_LAST_ENTRY))
2757                         break;
2758         }
2759 }