linux/drivers/s390/scsi/zfcp_fsf.c
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   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
  30struct kmem_cache *zfcp_fsf_qtcb_cache;
  31
  32static bool ber_stop = true;
  33module_param(ber_stop, bool, 0600);
  34MODULE_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
  37static 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
  47static 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
  55static 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 */
  64static 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
  80static 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 */
  92void 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
 106static 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
 123void 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
 144static 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        }
 225out:
 226        zfcp_erp_set_adapter_status(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 227}
 228
 229static 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
 245static void
 246zfcp_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
 258static 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
 331static 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
 353static 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
 372static 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 */
 452static 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 */
 485void 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
 511u32 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
 537static 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
 581static 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 */
 666static 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 */
 708ssize_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
 737static 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
 753static 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
 769static 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
 803static 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
 820static 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
 836static 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
 882static 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 */
 926int 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
 965failed_req_send:
 966        req->data = NULL;
 967        mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
 968failed_buf:
 969        zfcp_dbf_hba_fsf_uss("fssr__1", req);
 970        zfcp_fsf_req_free(req);
 971out:
 972        spin_unlock_irq(&qdio->req_q_lock);
 973        return retval;
 974}
 975
 976static 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
1039struct 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
1076out_error_free:
1077        zfcp_fsf_req_free(req);
1078        req = NULL;
1079out:
1080        spin_unlock_irq(&qdio->req_q_lock);
1081        return req;
1082}
1083
1084static 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
1126skip_fsfstatus:
1127        if (ct->handler)
1128                ct->handler(ct->handler_data);
1129}
1130
1131static 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
1141static 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
1194static 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 */
1222int 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
1261failed_send:
1262        zfcp_fsf_req_free(req);
1263out:
1264        spin_unlock_irq(&qdio->req_q_lock);
1265        return ret;
1266}
1267
1268static 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        }
1307skip_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 */
1319int 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
1362failed_send:
1363        zfcp_fsf_req_free(req);
1364out:
1365        spin_unlock_irq(&qdio->req_q_lock);
1366        return ret;
1367}
1368
1369int 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! */
1407out:
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 */
1425int 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
1473out_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 */
1483int 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! */
1519out:
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 */
1537int 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
1582out_unlock:
1583        spin_unlock_irq(&qdio->req_q_lock);
1584        return retval;
1585}
1586
1587static 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
1632out:
1633        port->connection_info_old = port->connection_info;
1634}
1635
1636static 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
1692static 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
1767out:
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 */
1776int 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! */
1814out:
1815        spin_unlock_irq(&qdio->req_q_lock);
1816        return retval;
1817}
1818
1819static 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 */
1844int 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! */
1879out:
1880        spin_unlock_irq(&qdio->req_q_lock);
1881        return retval;
1882}
1883
1884static 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        }
1909out:
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 */
1918int 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! */
1952out:
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
1959static 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 */
1977int 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! */
2011out:
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
2018static 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 */
2071int 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! */
2106out:
2107        spin_unlock_irq(&qdio->req_q_lock);
2108        return retval;
2109}
2110
2111static 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 */
2190int 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! */
2230out:
2231        spin_unlock_irq(&qdio->req_q_lock);
2232        return retval;
2233}
2234
2235static 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 */
2282int 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! */
2319out:
2320        spin_unlock_irq(&qdio->req_q_lock);
2321        return retval;
2322}
2323
2324static 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
2331static 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->request, &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 */
2388static 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
2459static 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
2499skip_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
2514static 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 */
2556int 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_cmnd->device->sector_size;
2603                io->ref_tag_value = scsi_get_lba(scsi_cmnd) & 0xFFFFFFFF;
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
2641failed_scsi_cmnd:
2642        zfcp_fsf_req_free(req);
2643        scsi_cmnd->host_scribble = NULL;
2644out:
2645        spin_unlock_irqrestore(&qdio->req_q_lock, flags);
2646        return retval;
2647}
2648
2649static 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 */
2672struct 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;
2719out:
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 */
2729void 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}
2760