linux/drivers/s390/scsi/zfcp_scsi.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * zfcp device driver
   4 *
   5 * Interface to Linux SCSI midlayer.
   6 *
   7 * Copyright IBM Corp. 2002, 2020
   8 */
   9
  10#define KMSG_COMPONENT "zfcp"
  11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  12
  13#include <linux/module.h>
  14#include <linux/types.h>
  15#include <linux/slab.h>
  16#include <scsi/fc/fc_fcp.h>
  17#include <scsi/scsi_eh.h>
  18#include <linux/atomic.h>
  19#include "zfcp_ext.h"
  20#include "zfcp_dbf.h"
  21#include "zfcp_fc.h"
  22#include "zfcp_reqlist.h"
  23
  24static unsigned int default_depth = 32;
  25module_param_named(queue_depth, default_depth, uint, 0600);
  26MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  27
  28static bool enable_dif;
  29module_param_named(dif, enable_dif, bool, 0400);
  30MODULE_PARM_DESC(dif, "Enable DIF data integrity support (default off)");
  31
  32bool zfcp_experimental_dix;
  33module_param_named(dix, zfcp_experimental_dix, bool, 0400);
  34MODULE_PARM_DESC(dix, "Enable experimental DIX (data integrity extension) support which implies DIF support (default off)");
  35
  36static bool allow_lun_scan = true;
  37module_param(allow_lun_scan, bool, 0600);
  38MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  39
  40static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  41{
  42        struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  43
  44        /* if previous slave_alloc returned early, there is nothing to do */
  45        if (!zfcp_sdev->port)
  46                return;
  47
  48        zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  49        put_device(&zfcp_sdev->port->dev);
  50}
  51
  52static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  53{
  54        if (sdp->tagged_supported)
  55                scsi_change_queue_depth(sdp, default_depth);
  56        return 0;
  57}
  58
  59static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  60{
  61        set_host_byte(scpnt, result);
  62        zfcp_dbf_scsi_fail_send(scpnt);
  63        scpnt->scsi_done(scpnt);
  64}
  65
  66static
  67int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  68{
  69        struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  70        struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  71        int    status, scsi_result, ret;
  72
  73        /* reset the status for this request */
  74        scpnt->result = 0;
  75        scpnt->host_scribble = NULL;
  76
  77        scsi_result = fc_remote_port_chkready(rport);
  78        if (unlikely(scsi_result)) {
  79                scpnt->result = scsi_result;
  80                zfcp_dbf_scsi_fail_send(scpnt);
  81                scpnt->scsi_done(scpnt);
  82                return 0;
  83        }
  84
  85        status = atomic_read(&zfcp_sdev->status);
  86        if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  87                     !(atomic_read(&zfcp_sdev->port->status) &
  88                       ZFCP_STATUS_COMMON_ERP_FAILED)) {
  89                /* only LUN access denied, but port is good
  90                 * not covered by FC transport, have to fail here */
  91                zfcp_scsi_command_fail(scpnt, DID_ERROR);
  92                return 0;
  93        }
  94
  95        if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  96                /* This could be
  97                 * call to rport_delete pending: mimic retry from
  98                 *      fc_remote_port_chkready until rport is BLOCKED
  99                 */
 100                zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
 101                return 0;
 102        }
 103
 104        ret = zfcp_fsf_fcp_cmnd(scpnt);
 105        if (unlikely(ret == -EBUSY))
 106                return SCSI_MLQUEUE_DEVICE_BUSY;
 107        else if (unlikely(ret < 0))
 108                return SCSI_MLQUEUE_HOST_BUSY;
 109
 110        return ret;
 111}
 112
 113static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
 114{
 115        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 116        struct zfcp_adapter *adapter =
 117                (struct zfcp_adapter *) sdev->host->hostdata[0];
 118        struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 119        struct zfcp_port *port;
 120        struct zfcp_unit *unit;
 121        int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
 122
 123        zfcp_sdev->erp_action.adapter = adapter;
 124        zfcp_sdev->erp_action.sdev = sdev;
 125
 126        port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 127        if (!port)
 128                return -ENXIO;
 129
 130        zfcp_sdev->erp_action.port = port;
 131
 132        mutex_lock(&zfcp_sysfs_port_units_mutex);
 133        if (zfcp_sysfs_port_is_removing(port)) {
 134                /* port is already gone */
 135                mutex_unlock(&zfcp_sysfs_port_units_mutex);
 136                put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
 137                return -ENXIO;
 138        }
 139        mutex_unlock(&zfcp_sysfs_port_units_mutex);
 140
 141        unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
 142        if (unit)
 143                put_device(&unit->dev);
 144
 145        if (!unit && !(allow_lun_scan && npiv)) {
 146                put_device(&port->dev);
 147                return -ENXIO;
 148        }
 149
 150        zfcp_sdev->port = port;
 151        zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
 152        zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
 153        zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
 154        zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
 155        zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
 156        zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
 157        spin_lock_init(&zfcp_sdev->latencies.lock);
 158
 159        zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
 160        zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
 161        zfcp_erp_wait(port->adapter);
 162
 163        return 0;
 164}
 165
 166static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
 167{
 168        struct Scsi_Host *scsi_host = scpnt->device->host;
 169        struct zfcp_adapter *adapter =
 170                (struct zfcp_adapter *) scsi_host->hostdata[0];
 171        struct zfcp_fsf_req *old_req, *abrt_req;
 172        unsigned long flags;
 173        unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
 174        int retval = SUCCESS, ret;
 175        int retry = 3;
 176        char *dbf_tag;
 177
 178        /* avoid race condition between late normal completion and abort */
 179        write_lock_irqsave(&adapter->abort_lock, flags);
 180
 181        old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
 182        if (!old_req) {
 183                write_unlock_irqrestore(&adapter->abort_lock, flags);
 184                zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
 185                return FAILED; /* completion could be in progress */
 186        }
 187        old_req->data = NULL;
 188
 189        /* don't access old fsf_req after releasing the abort_lock */
 190        write_unlock_irqrestore(&adapter->abort_lock, flags);
 191
 192        while (retry--) {
 193                abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
 194                if (abrt_req)
 195                        break;
 196
 197                zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
 198                zfcp_erp_wait(adapter);
 199                ret = fc_block_scsi_eh(scpnt);
 200                if (ret) {
 201                        zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
 202                        return ret;
 203                }
 204                if (!(atomic_read(&adapter->status) &
 205                      ZFCP_STATUS_COMMON_RUNNING)) {
 206                        zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
 207                        return SUCCESS;
 208                }
 209        }
 210        if (!abrt_req) {
 211                zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
 212                return FAILED;
 213        }
 214
 215        wait_for_completion(&abrt_req->completion);
 216
 217        if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
 218                dbf_tag = "abrt_ok";
 219        else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
 220                dbf_tag = "abrt_nn";
 221        else {
 222                dbf_tag = "abrt_fa";
 223                retval = FAILED;
 224        }
 225        zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
 226        zfcp_fsf_req_free(abrt_req);
 227        return retval;
 228}
 229
 230struct zfcp_scsi_req_filter {
 231        u8 tmf_scope;
 232        u32 lun_handle;
 233        u32 port_handle;
 234};
 235
 236static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
 237{
 238        struct zfcp_scsi_req_filter *filter =
 239                (struct zfcp_scsi_req_filter *)data;
 240
 241        /* already aborted - prevent side-effects - or not a SCSI command */
 242        if (old_req->data == NULL ||
 243            zfcp_fsf_req_is_status_read_buffer(old_req) ||
 244            old_req->qtcb->header.fsf_command != FSF_QTCB_FCP_CMND)
 245                return;
 246
 247        /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
 248        if (old_req->qtcb->header.port_handle != filter->port_handle)
 249                return;
 250
 251        if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
 252            old_req->qtcb->header.lun_handle != filter->lun_handle)
 253                return;
 254
 255        zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
 256        old_req->data = NULL;
 257}
 258
 259static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
 260{
 261        struct zfcp_adapter *adapter = zsdev->port->adapter;
 262        struct zfcp_scsi_req_filter filter = {
 263                .tmf_scope = FCP_TMF_TGT_RESET,
 264                .port_handle = zsdev->port->handle,
 265        };
 266        unsigned long flags;
 267
 268        if (tm_flags == FCP_TMF_LUN_RESET) {
 269                filter.tmf_scope = FCP_TMF_LUN_RESET;
 270                filter.lun_handle = zsdev->lun_handle;
 271        }
 272
 273        /*
 274         * abort_lock secures against other processings - in the abort-function
 275         * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
 276         */
 277        write_lock_irqsave(&adapter->abort_lock, flags);
 278        zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
 279                                   &filter);
 280        write_unlock_irqrestore(&adapter->abort_lock, flags);
 281}
 282
 283/**
 284 * zfcp_scsi_task_mgmt_function() - Send a task management function (sync).
 285 * @sdev: Pointer to SCSI device to send the task management command to.
 286 * @tm_flags: Task management flags,
 287 *            here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
 288 */
 289static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
 290{
 291        struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
 292        struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 293        struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
 294        struct zfcp_fsf_req *fsf_req = NULL;
 295        int retval = SUCCESS, ret;
 296        int retry = 3;
 297
 298        while (retry--) {
 299                fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags);
 300                if (fsf_req)
 301                        break;
 302
 303                zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
 304                zfcp_erp_wait(adapter);
 305                ret = fc_block_rport(rport);
 306                if (ret) {
 307                        zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
 308                        return ret;
 309                }
 310
 311                if (!(atomic_read(&adapter->status) &
 312                      ZFCP_STATUS_COMMON_RUNNING)) {
 313                        zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
 314                        return SUCCESS;
 315                }
 316        }
 317        if (!fsf_req) {
 318                zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
 319                return FAILED;
 320        }
 321
 322        wait_for_completion(&fsf_req->completion);
 323
 324        if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
 325                zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
 326                retval = FAILED;
 327        } else {
 328                zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
 329                zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
 330        }
 331
 332        zfcp_fsf_req_free(fsf_req);
 333        return retval;
 334}
 335
 336static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
 337{
 338        struct scsi_device *sdev = scpnt->device;
 339
 340        return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
 341}
 342
 343static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
 344{
 345        struct scsi_target *starget = scsi_target(scpnt->device);
 346        struct fc_rport *rport = starget_to_rport(starget);
 347        struct Scsi_Host *shost = rport_to_shost(rport);
 348        struct scsi_device *sdev = NULL, *tmp_sdev;
 349        struct zfcp_adapter *adapter =
 350                (struct zfcp_adapter *)shost->hostdata[0];
 351        int ret;
 352
 353        shost_for_each_device(tmp_sdev, shost) {
 354                if (tmp_sdev->id == starget->id) {
 355                        sdev = tmp_sdev;
 356                        break;
 357                }
 358        }
 359        if (!sdev) {
 360                ret = FAILED;
 361                zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
 362                return ret;
 363        }
 364
 365        ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
 366
 367        /* release reference from above shost_for_each_device */
 368        if (sdev)
 369                scsi_device_put(tmp_sdev);
 370
 371        return ret;
 372}
 373
 374static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
 375{
 376        struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
 377        struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
 378        int ret = SUCCESS, fc_ret;
 379
 380        if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
 381                zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p");
 382                zfcp_erp_wait(adapter);
 383        }
 384        zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
 385        zfcp_erp_wait(adapter);
 386        fc_ret = fc_block_scsi_eh(scpnt);
 387        if (fc_ret)
 388                ret = fc_ret;
 389
 390        zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
 391        return ret;
 392}
 393
 394/**
 395 * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
 396 * @shost: Pointer to Scsi_Host to perform action on.
 397 * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
 398 *
 399 * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
 400 *
 401 * This is similar to zfcp_sysfs_adapter_failed_store().
 402 */
 403static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
 404{
 405        struct zfcp_adapter *adapter =
 406                (struct zfcp_adapter *)shost->hostdata[0];
 407        int ret = 0;
 408
 409        if (reset_type != SCSI_ADAPTER_RESET) {
 410                ret = -EOPNOTSUPP;
 411                zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
 412                return ret;
 413        }
 414
 415        zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
 416        return ret;
 417}
 418
 419struct scsi_transport_template *zfcp_scsi_transport_template;
 420
 421static struct scsi_host_template zfcp_scsi_host_template = {
 422        .module                  = THIS_MODULE,
 423        .name                    = "zfcp",
 424        .queuecommand            = zfcp_scsi_queuecommand,
 425        .eh_timed_out            = fc_eh_timed_out,
 426        .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
 427        .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
 428        .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
 429        .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
 430        .slave_alloc             = zfcp_scsi_slave_alloc,
 431        .slave_configure         = zfcp_scsi_slave_configure,
 432        .slave_destroy           = zfcp_scsi_slave_destroy,
 433        .change_queue_depth      = scsi_change_queue_depth,
 434        .host_reset              = zfcp_scsi_sysfs_host_reset,
 435        .proc_name               = "zfcp",
 436        .can_queue               = 4096,
 437        .this_id                 = -1,
 438        .sg_tablesize            = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 439                                     * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
 440                                   /* GCD, adjusted later */
 441        .max_sectors             = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
 442                                     * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
 443                                   /* GCD, adjusted later */
 444        /* report size limit per scatter-gather segment */
 445        .max_segment_size        = ZFCP_QDIO_SBALE_LEN,
 446        .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
 447        .shost_attrs             = zfcp_sysfs_shost_attrs,
 448        .sdev_attrs              = zfcp_sysfs_sdev_attrs,
 449        .track_queue_depth       = 1,
 450        .supported_mode          = MODE_INITIATOR,
 451};
 452
 453/**
 454 * zfcp_scsi_adapter_register() - Allocate and register SCSI and FC host with
 455 *                                SCSI midlayer
 456 * @adapter: The zfcp adapter to register with the SCSI midlayer
 457 *
 458 * Allocates the SCSI host object for the given adapter, sets basic properties
 459 * (such as the transport template, QDIO limits, ...), and registers it with
 460 * the midlayer.
 461 *
 462 * During registration with the midlayer the corresponding FC host object for
 463 * the referenced transport class is also implicitely allocated.
 464 *
 465 * Upon success adapter->scsi_host is set, and upon failure it remains NULL. If
 466 * adapter->scsi_host is already set, nothing is done.
 467 *
 468 * Return:
 469 * * 0       - Allocation and registration was successful
 470 * * -EEXIST - SCSI and FC host did already exist, nothing was done, nothing
 471 *             was changed
 472 * * -EIO    - Allocation or registration failed
 473 */
 474int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
 475{
 476        struct ccw_dev_id dev_id;
 477
 478        if (adapter->scsi_host)
 479                return -EEXIST;
 480
 481        ccw_device_get_id(adapter->ccw_device, &dev_id);
 482        /* register adapter as SCSI host with mid layer of SCSI stack */
 483        adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
 484                                             sizeof (struct zfcp_adapter *));
 485        if (!adapter->scsi_host)
 486                goto err_out;
 487
 488        /* tell the SCSI stack some characteristics of this adapter */
 489        adapter->scsi_host->max_id = 511;
 490        adapter->scsi_host->max_lun = 0xFFFFFFFF;
 491        adapter->scsi_host->max_channel = 0;
 492        adapter->scsi_host->unique_id = dev_id.devno;
 493        adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
 494        adapter->scsi_host->transportt = zfcp_scsi_transport_template;
 495
 496        /* make all basic properties known at registration time */
 497        zfcp_qdio_shost_update(adapter, adapter->qdio);
 498        zfcp_scsi_set_prot(adapter);
 499
 500        adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
 501
 502        if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
 503                scsi_host_put(adapter->scsi_host);
 504                goto err_out;
 505        }
 506
 507        return 0;
 508err_out:
 509        adapter->scsi_host = NULL;
 510        dev_err(&adapter->ccw_device->dev,
 511                "Registering the FCP device with the SCSI stack failed\n");
 512        return -EIO;
 513}
 514
 515/**
 516 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
 517 * @adapter: The zfcp adapter to unregister.
 518 */
 519void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
 520{
 521        struct Scsi_Host *shost;
 522        struct zfcp_port *port;
 523
 524        shost = adapter->scsi_host;
 525        if (!shost)
 526                return;
 527
 528        read_lock_irq(&adapter->port_list_lock);
 529        list_for_each_entry(port, &adapter->port_list, list)
 530                port->rport = NULL;
 531        read_unlock_irq(&adapter->port_list_lock);
 532
 533        fc_remove_host(shost);
 534        scsi_remove_host(shost);
 535        scsi_host_put(shost);
 536        adapter->scsi_host = NULL;
 537}
 538
 539static struct fc_host_statistics*
 540zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter)
 541{
 542        struct fc_host_statistics *fc_stats;
 543
 544        if (!adapter->fc_stats) {
 545                fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
 546                if (!fc_stats)
 547                        return NULL;
 548                adapter->fc_stats = fc_stats; /* freed in adapter_release */
 549        }
 550        memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
 551        return adapter->fc_stats;
 552}
 553
 554static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
 555                                           struct fsf_qtcb_bottom_port *data,
 556                                           struct fsf_qtcb_bottom_port *old)
 557{
 558        fc_stats->seconds_since_last_reset =
 559                data->seconds_since_last_reset - old->seconds_since_last_reset;
 560        fc_stats->tx_frames = data->tx_frames - old->tx_frames;
 561        fc_stats->tx_words = data->tx_words - old->tx_words;
 562        fc_stats->rx_frames = data->rx_frames - old->rx_frames;
 563        fc_stats->rx_words = data->rx_words - old->rx_words;
 564        fc_stats->lip_count = data->lip - old->lip;
 565        fc_stats->nos_count = data->nos - old->nos;
 566        fc_stats->error_frames = data->error_frames - old->error_frames;
 567        fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
 568        fc_stats->link_failure_count = data->link_failure - old->link_failure;
 569        fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
 570        fc_stats->loss_of_signal_count =
 571                data->loss_of_signal - old->loss_of_signal;
 572        fc_stats->prim_seq_protocol_err_count =
 573                data->psp_error_counts - old->psp_error_counts;
 574        fc_stats->invalid_tx_word_count =
 575                data->invalid_tx_words - old->invalid_tx_words;
 576        fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
 577        fc_stats->fcp_input_requests =
 578                data->input_requests - old->input_requests;
 579        fc_stats->fcp_output_requests =
 580                data->output_requests - old->output_requests;
 581        fc_stats->fcp_control_requests =
 582                data->control_requests - old->control_requests;
 583        fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
 584        fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
 585}
 586
 587static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats,
 588                                        struct fsf_qtcb_bottom_port *data)
 589{
 590        fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
 591        fc_stats->tx_frames = data->tx_frames;
 592        fc_stats->tx_words = data->tx_words;
 593        fc_stats->rx_frames = data->rx_frames;
 594        fc_stats->rx_words = data->rx_words;
 595        fc_stats->lip_count = data->lip;
 596        fc_stats->nos_count = data->nos;
 597        fc_stats->error_frames = data->error_frames;
 598        fc_stats->dumped_frames = data->dumped_frames;
 599        fc_stats->link_failure_count = data->link_failure;
 600        fc_stats->loss_of_sync_count = data->loss_of_sync;
 601        fc_stats->loss_of_signal_count = data->loss_of_signal;
 602        fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
 603        fc_stats->invalid_tx_word_count = data->invalid_tx_words;
 604        fc_stats->invalid_crc_count = data->invalid_crcs;
 605        fc_stats->fcp_input_requests = data->input_requests;
 606        fc_stats->fcp_output_requests = data->output_requests;
 607        fc_stats->fcp_control_requests = data->control_requests;
 608        fc_stats->fcp_input_megabytes = data->input_mb;
 609        fc_stats->fcp_output_megabytes = data->output_mb;
 610}
 611
 612static struct fc_host_statistics *
 613zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
 614{
 615        struct zfcp_adapter *adapter;
 616        struct fc_host_statistics *fc_stats;
 617        struct fsf_qtcb_bottom_port *data;
 618        int ret;
 619
 620        adapter = (struct zfcp_adapter *)host->hostdata[0];
 621        fc_stats = zfcp_scsi_init_fc_host_stats(adapter);
 622        if (!fc_stats)
 623                return NULL;
 624
 625        data = kzalloc(sizeof(*data), GFP_KERNEL);
 626        if (!data)
 627                return NULL;
 628
 629        ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 630        if (ret != 0 && ret != -EAGAIN) {
 631                kfree(data);
 632                return NULL;
 633        }
 634
 635        if (adapter->stats_reset &&
 636            ((jiffies/HZ - adapter->stats_reset) <
 637             data->seconds_since_last_reset))
 638                zfcp_scsi_adjust_fc_host_stats(fc_stats, data,
 639                                               adapter->stats_reset_data);
 640        else
 641                zfcp_scsi_set_fc_host_stats(fc_stats, data);
 642
 643        kfree(data);
 644        return fc_stats;
 645}
 646
 647static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
 648{
 649        struct zfcp_adapter *adapter;
 650        struct fsf_qtcb_bottom_port *data;
 651        int ret;
 652
 653        adapter = (struct zfcp_adapter *)shost->hostdata[0];
 654        data = kzalloc(sizeof(*data), GFP_KERNEL);
 655        if (!data)
 656                return;
 657
 658        ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
 659        if (ret != 0 && ret != -EAGAIN)
 660                kfree(data);
 661        else {
 662                adapter->stats_reset = jiffies/HZ;
 663                kfree(adapter->stats_reset_data);
 664                adapter->stats_reset_data = data; /* finally freed in
 665                                                     adapter_release */
 666        }
 667}
 668
 669static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost)
 670{
 671        struct zfcp_adapter *adapter =
 672                (struct zfcp_adapter *)shost->hostdata[0];
 673        int status = atomic_read(&adapter->status);
 674
 675        if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
 676            !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
 677                fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
 678        else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
 679                fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
 680        else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
 681                fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
 682        else
 683                fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
 684}
 685
 686static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport,
 687                                             u32 timeout)
 688{
 689        rport->dev_loss_tmo = timeout;
 690}
 691
 692/**
 693 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
 694 * @rport: The FC rport where to teminate I/O
 695 *
 696 * Abort all pending SCSI commands for a port by closing the
 697 * port. Using a reopen avoids a conflict with a shutdown
 698 * overwriting a reopen. The "forced" ensures that a disappeared port
 699 * is not opened again as valid due to the cached plogi data in
 700 * non-NPIV mode.
 701 */
 702static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
 703{
 704        struct zfcp_port *port;
 705        struct Scsi_Host *shost = rport_to_shost(rport);
 706        struct zfcp_adapter *adapter =
 707                (struct zfcp_adapter *)shost->hostdata[0];
 708
 709        port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
 710
 711        if (port) {
 712                zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
 713                put_device(&port->dev);
 714        } else {
 715                zfcp_erp_port_forced_no_port_dbf(
 716                        "sctrpin", adapter,
 717                        rport->port_name /* zfcp_scsi_rport_register */,
 718                        rport->port_id /* zfcp_scsi_rport_register */);
 719        }
 720}
 721
 722static void zfcp_scsi_rport_register(struct zfcp_port *port)
 723{
 724        struct fc_rport_identifiers ids;
 725        struct fc_rport *rport;
 726
 727        if (port->rport)
 728                return;
 729
 730        ids.node_name = port->wwnn;
 731        ids.port_name = port->wwpn;
 732        ids.port_id = port->d_id;
 733        ids.roles = FC_RPORT_ROLE_FCP_TARGET;
 734
 735        zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
 736                               ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
 737                               ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
 738        rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
 739        if (!rport) {
 740                dev_err(&port->adapter->ccw_device->dev,
 741                        "Registering port 0x%016Lx failed\n",
 742                        (unsigned long long)port->wwpn);
 743                return;
 744        }
 745
 746        rport->maxframe_size = port->maxframe_size;
 747        rport->supported_classes = port->supported_classes;
 748        port->rport = rport;
 749        port->starget_id = rport->scsi_target_id;
 750
 751        zfcp_unit_queue_scsi_scan(port);
 752}
 753
 754static void zfcp_scsi_rport_block(struct zfcp_port *port)
 755{
 756        struct fc_rport *rport = port->rport;
 757
 758        if (rport) {
 759                zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
 760                                       ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
 761                                       ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
 762                fc_remote_port_delete(rport);
 763                port->rport = NULL;
 764        }
 765}
 766
 767void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
 768{
 769        get_device(&port->dev);
 770        port->rport_task = RPORT_ADD;
 771
 772        if (!queue_work(port->adapter->work_queue, &port->rport_work))
 773                put_device(&port->dev);
 774}
 775
 776void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
 777{
 778        get_device(&port->dev);
 779        port->rport_task = RPORT_DEL;
 780
 781        if (port->rport && queue_work(port->adapter->work_queue,
 782                                      &port->rport_work))
 783                return;
 784
 785        put_device(&port->dev);
 786}
 787
 788void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
 789{
 790        unsigned long flags;
 791        struct zfcp_port *port;
 792
 793        read_lock_irqsave(&adapter->port_list_lock, flags);
 794        list_for_each_entry(port, &adapter->port_list, list)
 795                zfcp_scsi_schedule_rport_block(port);
 796        read_unlock_irqrestore(&adapter->port_list_lock, flags);
 797}
 798
 799void zfcp_scsi_rport_work(struct work_struct *work)
 800{
 801        struct zfcp_port *port = container_of(work, struct zfcp_port,
 802                                              rport_work);
 803
 804        set_worker_desc("zrp%c-%16llx",
 805                        (port->rport_task == RPORT_ADD) ? 'a' : 'd',
 806                        port->wwpn); /* < WORKER_DESC_LEN=24 */
 807        while (port->rport_task) {
 808                if (port->rport_task == RPORT_ADD) {
 809                        port->rport_task = RPORT_NONE;
 810                        zfcp_scsi_rport_register(port);
 811                } else {
 812                        port->rport_task = RPORT_NONE;
 813                        zfcp_scsi_rport_block(port);
 814                }
 815        }
 816
 817        put_device(&port->dev);
 818}
 819
 820/**
 821 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
 822 * @adapter: The adapter where to configure DIF/DIX for the SCSI host
 823 */
 824void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 825{
 826        unsigned int mask = 0;
 827        unsigned int data_div;
 828        struct Scsi_Host *shost = adapter->scsi_host;
 829
 830        data_div = atomic_read(&adapter->status) &
 831                   ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
 832
 833        if ((enable_dif || zfcp_experimental_dix) &&
 834            adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
 835                mask |= SHOST_DIF_TYPE1_PROTECTION;
 836
 837        if (zfcp_experimental_dix && data_div &&
 838            adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 839                mask |= SHOST_DIX_TYPE1_PROTECTION;
 840                scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
 841                shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
 842                shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
 843                shost->max_sectors = shost->sg_tablesize * 8;
 844        }
 845
 846        scsi_host_set_prot(shost, mask);
 847}
 848
 849/**
 850 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
 851 * @scmd: The SCSI command to report the error for
 852 * @ascq: The ASCQ to put in the sense buffer
 853 *
 854 * See the error handling in sd_done for the sense codes used here.
 855 * Set DID_SOFT_ERROR to retry the request, if possible.
 856 */
 857void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
 858{
 859        scsi_build_sense_buffer(1, scmd->sense_buffer,
 860                                ILLEGAL_REQUEST, 0x10, ascq);
 861        set_driver_byte(scmd, DRIVER_SENSE);
 862        scmd->result |= SAM_STAT_CHECK_CONDITION;
 863        set_host_byte(scmd, DID_SOFT_ERROR);
 864}
 865
 866void zfcp_scsi_shost_update_config_data(
 867        struct zfcp_adapter *const adapter,
 868        const struct fsf_qtcb_bottom_config *const bottom,
 869        const bool bottom_incomplete)
 870{
 871        struct Scsi_Host *const shost = adapter->scsi_host;
 872        const struct fc_els_flogi *nsp, *plogi;
 873
 874        if (shost == NULL)
 875                return;
 876
 877        snprintf(fc_host_firmware_version(shost), FC_VERSION_STRING_SIZE,
 878                 "0x%08x", bottom->lic_version);
 879
 880        if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
 881                snprintf(fc_host_hardware_version(shost),
 882                         FC_VERSION_STRING_SIZE,
 883                         "0x%08x", bottom->hardware_version);
 884                memcpy(fc_host_serial_number(shost), bottom->serial_number,
 885                       min(FC_SERIAL_NUMBER_SIZE, 17));
 886                EBCASC(fc_host_serial_number(shost),
 887                       min(FC_SERIAL_NUMBER_SIZE, 17));
 888        }
 889
 890        /* adjust pointers for missing command code */
 891        nsp = (struct fc_els_flogi *) ((u8 *)&bottom->nport_serv_param
 892                                        - sizeof(u32));
 893        plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload
 894                                        - sizeof(u32));
 895
 896        snprintf(fc_host_manufacturer(shost), FC_SERIAL_NUMBER_SIZE, "%s",
 897                 "IBM");
 898        fc_host_port_name(shost) = be64_to_cpu(nsp->fl_wwpn);
 899        fc_host_node_name(shost) = be64_to_cpu(nsp->fl_wwnn);
 900        fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 901
 902        zfcp_scsi_set_prot(adapter);
 903
 904        /* do not evaluate invalid fields */
 905        if (bottom_incomplete)
 906                return;
 907
 908        fc_host_port_id(shost) = ntoh24(bottom->s_id);
 909        fc_host_speed(shost) =
 910                zfcp_fsf_convert_portspeed(bottom->fc_link_speed);
 911
 912        snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x",
 913                 bottom->adapter_type);
 914
 915        switch (bottom->fc_topology) {
 916        case FSF_TOPO_P2P:
 917                fc_host_port_type(shost) = FC_PORTTYPE_PTP;
 918                fc_host_fabric_name(shost) = 0;
 919                break;
 920        case FSF_TOPO_FABRIC:
 921                fc_host_fabric_name(shost) = be64_to_cpu(plogi->fl_wwnn);
 922                if (bottom->connection_features & FSF_FEATURE_NPIV_MODE)
 923                        fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
 924                else
 925                        fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
 926                break;
 927        case FSF_TOPO_AL:
 928                fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
 929                fallthrough;
 930        default:
 931                fc_host_fabric_name(shost) = 0;
 932                break;
 933        }
 934}
 935
 936void zfcp_scsi_shost_update_port_data(
 937        struct zfcp_adapter *const adapter,
 938        const struct fsf_qtcb_bottom_port *const bottom)
 939{
 940        struct Scsi_Host *const shost = adapter->scsi_host;
 941
 942        if (shost == NULL)
 943                return;
 944
 945        fc_host_permanent_port_name(shost) = bottom->wwpn;
 946        fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
 947        fc_host_supported_speeds(shost) =
 948                zfcp_fsf_convert_portspeed(bottom->supported_speed);
 949        memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types,
 950               FC_FC4_LIST_SIZE);
 951        memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types,
 952               FC_FC4_LIST_SIZE);
 953}
 954
 955struct fc_function_template zfcp_transport_functions = {
 956        .show_starget_port_id = 1,
 957        .show_starget_port_name = 1,
 958        .show_starget_node_name = 1,
 959        .show_rport_supported_classes = 1,
 960        .show_rport_maxframe_size = 1,
 961        .show_rport_dev_loss_tmo = 1,
 962        .show_host_node_name = 1,
 963        .show_host_port_name = 1,
 964        .show_host_permanent_port_name = 1,
 965        .show_host_supported_classes = 1,
 966        .show_host_supported_fc4s = 1,
 967        .show_host_supported_speeds = 1,
 968        .show_host_maxframe_size = 1,
 969        .show_host_serial_number = 1,
 970        .show_host_manufacturer = 1,
 971        .show_host_model = 1,
 972        .show_host_hardware_version = 1,
 973        .show_host_firmware_version = 1,
 974        .get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
 975        .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
 976        .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
 977        .get_host_port_state = zfcp_scsi_get_host_port_state,
 978        .terminate_rport_io = zfcp_scsi_terminate_rport_io,
 979        .show_host_port_state = 1,
 980        .show_host_active_fc4s = 1,
 981        .bsg_request = zfcp_fc_exec_bsg_job,
 982        .bsg_timeout = zfcp_fc_timeout_bsg_job,
 983        /* no functions registered for following dynamic attributes but
 984           directly set by LLDD */
 985        .show_host_port_type = 1,
 986        .show_host_symbolic_name = 1,
 987        .show_host_speed = 1,
 988        .show_host_port_id = 1,
 989        .show_host_fabric_name = 1,
 990        .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
 991};
 992