drivers/s390/scsi/zfcp_scsi.c

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