Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[linux-2.6.git] / drivers / s390 / scsi / zfcp_scsi.c
1 /*
2  * zfcp device driver
3  *
4  * Interface to Linux SCSI midlayer.
5  *
6  * Copyright IBM Corporation 2002, 2010
7  */
8
9 #define KMSG_COMPONENT "zfcp"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <scsi/fc/fc_fcp.h>
16 #include <scsi/scsi_eh.h>
17 #include <linux/atomic.h>
18 #include "zfcp_ext.h"
19 #include "zfcp_dbf.h"
20 #include "zfcp_fc.h"
21 #include "zfcp_reqlist.h"
22
23 static unsigned int default_depth = 32;
24 module_param_named(queue_depth, default_depth, uint, 0600);
25 MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
26
27 static bool enable_dif;
28 module_param_named(dif, enable_dif, bool, 0400);
29 MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
30
31 static bool allow_lun_scan = 1;
32 module_param(allow_lun_scan, bool, 0600);
33 MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
34
35 static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
36                                         int reason)
37 {
38         switch (reason) {
39         case SCSI_QDEPTH_DEFAULT:
40                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
41                 break;
42         case SCSI_QDEPTH_QFULL:
43                 scsi_track_queue_full(sdev, depth);
44                 break;
45         case SCSI_QDEPTH_RAMP_UP:
46                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
47                 break;
48         default:
49                 return -EOPNOTSUPP;
50         }
51         return sdev->queue_depth;
52 }
53
54 static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
55 {
56         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
57
58         /* if previous slave_alloc returned early, there is nothing to do */
59         if (!zfcp_sdev->port)
60                 return;
61
62         zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
63         put_device(&zfcp_sdev->port->dev);
64 }
65
66 static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
67 {
68         if (sdp->tagged_supported)
69                 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
70         else
71                 scsi_adjust_queue_depth(sdp, 0, 1);
72         return 0;
73 }
74
75 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
76 {
77         set_host_byte(scpnt, result);
78         zfcp_dbf_scsi_fail_send(scpnt);
79         scpnt->scsi_done(scpnt);
80 }
81
82 static
83 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
84 {
85         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
86         struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
87         int    status, scsi_result, ret;
88
89         /* reset the status for this request */
90         scpnt->result = 0;
91         scpnt->host_scribble = NULL;
92
93         scsi_result = fc_remote_port_chkready(rport);
94         if (unlikely(scsi_result)) {
95                 scpnt->result = scsi_result;
96                 zfcp_dbf_scsi_fail_send(scpnt);
97                 scpnt->scsi_done(scpnt);
98                 return 0;
99         }
100
101         status = atomic_read(&zfcp_sdev->status);
102         if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
103                      !(atomic_read(&zfcp_sdev->port->status) &
104                        ZFCP_STATUS_COMMON_ERP_FAILED)) {
105                 /* only LUN access denied, but port is good
106                  * not covered by FC transport, have to fail here */
107                 zfcp_scsi_command_fail(scpnt, DID_ERROR);
108                 return 0;
109         }
110
111         if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
112                 /* This could be either
113                  * open LUN pending: this is temporary, will result in
114                  *      open LUN or ERP_FAILED, so retry command
115                  * call to rport_delete pending: mimic retry from
116                  *      fc_remote_port_chkready until rport is BLOCKED
117                  */
118                 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
119                 return 0;
120         }
121
122         ret = zfcp_fsf_fcp_cmnd(scpnt);
123         if (unlikely(ret == -EBUSY))
124                 return SCSI_MLQUEUE_DEVICE_BUSY;
125         else if (unlikely(ret < 0))
126                 return SCSI_MLQUEUE_HOST_BUSY;
127
128         return ret;
129 }
130
131 static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
132 {
133         struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
134         struct zfcp_adapter *adapter =
135                 (struct zfcp_adapter *) sdev->host->hostdata[0];
136         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
137         struct zfcp_port *port;
138         struct zfcp_unit *unit;
139         int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
140
141         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
142         if (!port)
143                 return -ENXIO;
144
145         unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
146         if (unit)
147                 put_device(&unit->dev);
148
149         if (!unit && !(allow_lun_scan && npiv)) {
150                 put_device(&port->dev);
151                 return -ENXIO;
152         }
153
154         zfcp_sdev->port = port;
155         zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
156         zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
157         zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
158         zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
159         zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
160         zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
161         spin_lock_init(&zfcp_sdev->latencies.lock);
162
163         zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
164         zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
165         zfcp_erp_wait(port->adapter);
166
167         return 0;
168 }
169
170 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
171 {
172         struct Scsi_Host *scsi_host = scpnt->device->host;
173         struct zfcp_adapter *adapter =
174                 (struct zfcp_adapter *) scsi_host->hostdata[0];
175         struct zfcp_fsf_req *old_req, *abrt_req;
176         unsigned long flags;
177         unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
178         int retval = SUCCESS, ret;
179         int retry = 3;
180         char *dbf_tag;
181
182         /* avoid race condition between late normal completion and abort */
183         write_lock_irqsave(&adapter->abort_lock, flags);
184
185         old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
186         if (!old_req) {
187                 write_unlock_irqrestore(&adapter->abort_lock, flags);
188                 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
189                 return FAILED; /* completion could be in progress */
190         }
191         old_req->data = NULL;
192
193         /* don't access old fsf_req after releasing the abort_lock */
194         write_unlock_irqrestore(&adapter->abort_lock, flags);
195
196         while (retry--) {
197                 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
198                 if (abrt_req)
199                         break;
200
201                 zfcp_erp_wait(adapter);
202                 ret = fc_block_scsi_eh(scpnt);
203                 if (ret) {
204                         zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
205                         return ret;
206                 }
207                 if (!(atomic_read(&adapter->status) &
208                       ZFCP_STATUS_COMMON_RUNNING)) {
209                         zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
210                         return SUCCESS;
211                 }
212         }
213         if (!abrt_req) {
214                 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
215                 return FAILED;
216         }
217
218         wait_for_completion(&abrt_req->completion);
219
220         if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
221                 dbf_tag = "abrt_ok";
222         else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
223                 dbf_tag = "abrt_nn";
224         else {
225                 dbf_tag = "abrt_fa";
226                 retval = FAILED;
227         }
228         zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
229         zfcp_fsf_req_free(abrt_req);
230         return retval;
231 }
232
233 static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
234 {
235         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
236         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
237         struct zfcp_fsf_req *fsf_req = NULL;
238         int retval = SUCCESS, ret;
239         int retry = 3;
240
241         while (retry--) {
242                 fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
243                 if (fsf_req)
244                         break;
245
246                 zfcp_erp_wait(adapter);
247                 ret = fc_block_scsi_eh(scpnt);
248                 if (ret)
249                         return ret;
250
251                 if (!(atomic_read(&adapter->status) &
252                       ZFCP_STATUS_COMMON_RUNNING)) {
253                         zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
254                         return SUCCESS;
255                 }
256         }
257         if (!fsf_req)
258                 return FAILED;
259
260         wait_for_completion(&fsf_req->completion);
261
262         if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
263                 zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
264                 retval = FAILED;
265         } else
266                 zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
267
268         zfcp_fsf_req_free(fsf_req);
269         return retval;
270 }
271
272 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
273 {
274         return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
275 }
276
277 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
278 {
279         return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
280 }
281
282 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
283 {
284         struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
285         struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
286         int ret;
287
288         zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
289         zfcp_erp_wait(adapter);
290         ret = fc_block_scsi_eh(scpnt);
291         if (ret)
292                 return ret;
293
294         return SUCCESS;
295 }
296
297 struct scsi_transport_template *zfcp_scsi_transport_template;
298
299 static struct scsi_host_template zfcp_scsi_host_template = {
300         .module                  = THIS_MODULE,
301         .name                    = "zfcp",
302         .queuecommand            = zfcp_scsi_queuecommand,
303         .eh_abort_handler        = zfcp_scsi_eh_abort_handler,
304         .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
305         .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
306         .eh_host_reset_handler   = zfcp_scsi_eh_host_reset_handler,
307         .slave_alloc             = zfcp_scsi_slave_alloc,
308         .slave_configure         = zfcp_scsi_slave_configure,
309         .slave_destroy           = zfcp_scsi_slave_destroy,
310         .change_queue_depth      = zfcp_scsi_change_queue_depth,
311         .proc_name               = "zfcp",
312         .can_queue               = 4096,
313         .this_id                 = -1,
314         .sg_tablesize            = 1, /* adjusted later */
315         .max_sectors             = 8, /* adjusted later */
316         .dma_boundary            = ZFCP_QDIO_SBALE_LEN - 1,
317         .cmd_per_lun             = 1,
318         .use_clustering          = 1,
319         .shost_attrs             = zfcp_sysfs_shost_attrs,
320         .sdev_attrs              = zfcp_sysfs_sdev_attrs,
321 };
322
323 /**
324  * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
325  * @adapter: The zfcp adapter to register with the SCSI midlayer
326  */
327 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
328 {
329         struct ccw_dev_id dev_id;
330
331         if (adapter->scsi_host)
332                 return 0;
333
334         ccw_device_get_id(adapter->ccw_device, &dev_id);
335         /* register adapter as SCSI host with mid layer of SCSI stack */
336         adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
337                                              sizeof (struct zfcp_adapter *));
338         if (!adapter->scsi_host) {
339                 dev_err(&adapter->ccw_device->dev,
340                         "Registering the FCP device with the "
341                         "SCSI stack failed\n");
342                 return -EIO;
343         }
344
345         /* tell the SCSI stack some characteristics of this adapter */
346         adapter->scsi_host->max_id = 511;
347         adapter->scsi_host->max_lun = 0xFFFFFFFF;
348         adapter->scsi_host->max_channel = 0;
349         adapter->scsi_host->unique_id = dev_id.devno;
350         adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
351         adapter->scsi_host->transportt = zfcp_scsi_transport_template;
352
353         adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
354
355         if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
356                 scsi_host_put(adapter->scsi_host);
357                 return -EIO;
358         }
359
360         return 0;
361 }
362
363 /**
364  * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
365  * @adapter: The zfcp adapter to unregister.
366  */
367 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
368 {
369         struct Scsi_Host *shost;
370         struct zfcp_port *port;
371
372         shost = adapter->scsi_host;
373         if (!shost)
374                 return;
375
376         read_lock_irq(&adapter->port_list_lock);
377         list_for_each_entry(port, &adapter->port_list, list)
378                 port->rport = NULL;
379         read_unlock_irq(&adapter->port_list_lock);
380
381         fc_remove_host(shost);
382         scsi_remove_host(shost);
383         scsi_host_put(shost);
384         adapter->scsi_host = NULL;
385 }
386
387 static struct fc_host_statistics*
388 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
389 {
390         struct fc_host_statistics *fc_stats;
391
392         if (!adapter->fc_stats) {
393                 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
394                 if (!fc_stats)
395                         return NULL;
396                 adapter->fc_stats = fc_stats; /* freed in adapter_release */
397         }
398         memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
399         return adapter->fc_stats;
400 }
401
402 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
403                                       struct fsf_qtcb_bottom_port *data,
404                                       struct fsf_qtcb_bottom_port *old)
405 {
406         fc_stats->seconds_since_last_reset =
407                 data->seconds_since_last_reset - old->seconds_since_last_reset;
408         fc_stats->tx_frames = data->tx_frames - old->tx_frames;
409         fc_stats->tx_words = data->tx_words - old->tx_words;
410         fc_stats->rx_frames = data->rx_frames - old->rx_frames;
411         fc_stats->rx_words = data->rx_words - old->rx_words;
412         fc_stats->lip_count = data->lip - old->lip;
413         fc_stats->nos_count = data->nos - old->nos;
414         fc_stats->error_frames = data->error_frames - old->error_frames;
415         fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
416         fc_stats->link_failure_count = data->link_failure - old->link_failure;
417         fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
418         fc_stats->loss_of_signal_count =
419                 data->loss_of_signal - old->loss_of_signal;
420         fc_stats->prim_seq_protocol_err_count =
421                 data->psp_error_counts - old->psp_error_counts;
422         fc_stats->invalid_tx_word_count =
423                 data->invalid_tx_words - old->invalid_tx_words;
424         fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
425         fc_stats->fcp_input_requests =
426                 data->input_requests - old->input_requests;
427         fc_stats->fcp_output_requests =
428                 data->output_requests - old->output_requests;
429         fc_stats->fcp_control_requests =
430                 data->control_requests - old->control_requests;
431         fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
432         fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
433 }
434
435 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
436                                    struct fsf_qtcb_bottom_port *data)
437 {
438         fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
439         fc_stats->tx_frames = data->tx_frames;
440         fc_stats->tx_words = data->tx_words;
441         fc_stats->rx_frames = data->rx_frames;
442         fc_stats->rx_words = data->rx_words;
443         fc_stats->lip_count = data->lip;
444         fc_stats->nos_count = data->nos;
445         fc_stats->error_frames = data->error_frames;
446         fc_stats->dumped_frames = data->dumped_frames;
447         fc_stats->link_failure_count = data->link_failure;
448         fc_stats->loss_of_sync_count = data->loss_of_sync;
449         fc_stats->loss_of_signal_count = data->loss_of_signal;
450         fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
451         fc_stats->invalid_tx_word_count = data->invalid_tx_words;
452         fc_stats->invalid_crc_count = data->invalid_crcs;
453         fc_stats->fcp_input_requests = data->input_requests;
454         fc_stats->fcp_output_requests = data->output_requests;
455         fc_stats->fcp_control_requests = data->control_requests;
456         fc_stats->fcp_input_megabytes = data->input_mb;
457         fc_stats->fcp_output_megabytes = data->output_mb;
458 }
459
460 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
461 {
462         struct zfcp_adapter *adapter;
463         struct fc_host_statistics *fc_stats;
464         struct fsf_qtcb_bottom_port *data;
465         int ret;
466
467         adapter = (struct zfcp_adapter *)host->hostdata[0];
468         fc_stats = zfcp_init_fc_host_stats(adapter);
469         if (!fc_stats)
470                 return NULL;
471
472         data = kzalloc(sizeof(*data), GFP_KERNEL);
473         if (!data)
474                 return NULL;
475
476         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
477         if (ret) {
478                 kfree(data);
479                 return NULL;
480         }
481
482         if (adapter->stats_reset &&
483             ((jiffies/HZ - adapter->stats_reset) <
484              data->seconds_since_last_reset))
485                 zfcp_adjust_fc_host_stats(fc_stats, data,
486                                           adapter->stats_reset_data);
487         else
488                 zfcp_set_fc_host_stats(fc_stats, data);
489
490         kfree(data);
491         return fc_stats;
492 }
493
494 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
495 {
496         struct zfcp_adapter *adapter;
497         struct fsf_qtcb_bottom_port *data;
498         int ret;
499
500         adapter = (struct zfcp_adapter *)shost->hostdata[0];
501         data = kzalloc(sizeof(*data), GFP_KERNEL);
502         if (!data)
503                 return;
504
505         ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
506         if (ret)
507                 kfree(data);
508         else {
509                 adapter->stats_reset = jiffies/HZ;
510                 kfree(adapter->stats_reset_data);
511                 adapter->stats_reset_data = data; /* finally freed in
512                                                      adapter_release */
513         }
514 }
515
516 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
517 {
518         struct zfcp_adapter *adapter =
519                 (struct zfcp_adapter *)shost->hostdata[0];
520         int status = atomic_read(&adapter->status);
521
522         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
523             !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
524                 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
525         else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
526                 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
527         else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
528                 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
529         else
530                 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
531 }
532
533 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
534 {
535         rport->dev_loss_tmo = timeout;
536 }
537
538 /**
539  * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
540  * @rport: The FC rport where to teminate I/O
541  *
542  * Abort all pending SCSI commands for a port by closing the
543  * port. Using a reopen avoids a conflict with a shutdown
544  * overwriting a reopen. The "forced" ensures that a disappeared port
545  * is not opened again as valid due to the cached plogi data in
546  * non-NPIV mode.
547  */
548 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
549 {
550         struct zfcp_port *port;
551         struct Scsi_Host *shost = rport_to_shost(rport);
552         struct zfcp_adapter *adapter =
553                 (struct zfcp_adapter *)shost->hostdata[0];
554
555         port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
556
557         if (port) {
558                 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
559                 put_device(&port->dev);
560         }
561 }
562
563 static void zfcp_scsi_rport_register(struct zfcp_port *port)
564 {
565         struct fc_rport_identifiers ids;
566         struct fc_rport *rport;
567
568         if (port->rport)
569                 return;
570
571         ids.node_name = port->wwnn;
572         ids.port_name = port->wwpn;
573         ids.port_id = port->d_id;
574         ids.roles = FC_RPORT_ROLE_FCP_TARGET;
575
576         rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
577         if (!rport) {
578                 dev_err(&port->adapter->ccw_device->dev,
579                         "Registering port 0x%016Lx failed\n",
580                         (unsigned long long)port->wwpn);
581                 return;
582         }
583
584         rport->maxframe_size = port->maxframe_size;
585         rport->supported_classes = port->supported_classes;
586         port->rport = rport;
587         port->starget_id = rport->scsi_target_id;
588
589         zfcp_unit_queue_scsi_scan(port);
590 }
591
592 static void zfcp_scsi_rport_block(struct zfcp_port *port)
593 {
594         struct fc_rport *rport = port->rport;
595
596         if (rport) {
597                 fc_remote_port_delete(rport);
598                 port->rport = NULL;
599         }
600 }
601
602 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
603 {
604         get_device(&port->dev);
605         port->rport_task = RPORT_ADD;
606
607         if (!queue_work(port->adapter->work_queue, &port->rport_work))
608                 put_device(&port->dev);
609 }
610
611 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
612 {
613         get_device(&port->dev);
614         port->rport_task = RPORT_DEL;
615
616         if (port->rport && queue_work(port->adapter->work_queue,
617                                       &port->rport_work))
618                 return;
619
620         put_device(&port->dev);
621 }
622
623 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
624 {
625         unsigned long flags;
626         struct zfcp_port *port;
627
628         read_lock_irqsave(&adapter->port_list_lock, flags);
629         list_for_each_entry(port, &adapter->port_list, list)
630                 zfcp_scsi_schedule_rport_block(port);
631         read_unlock_irqrestore(&adapter->port_list_lock, flags);
632 }
633
634 void zfcp_scsi_rport_work(struct work_struct *work)
635 {
636         struct zfcp_port *port = container_of(work, struct zfcp_port,
637                                               rport_work);
638
639         while (port->rport_task) {
640                 if (port->rport_task == RPORT_ADD) {
641                         port->rport_task = RPORT_NONE;
642                         zfcp_scsi_rport_register(port);
643                 } else {
644                         port->rport_task = RPORT_NONE;
645                         zfcp_scsi_rport_block(port);
646                 }
647         }
648
649         put_device(&port->dev);
650 }
651
652 /**
653  * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
654  * @adapter: The adapter where to configure DIF/DIX for the SCSI host
655  */
656 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
657 {
658         unsigned int mask = 0;
659         unsigned int data_div;
660         struct Scsi_Host *shost = adapter->scsi_host;
661
662         data_div = atomic_read(&adapter->status) &
663                    ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
664
665         if (enable_dif &&
666             adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
667                 mask |= SHOST_DIF_TYPE1_PROTECTION;
668
669         if (enable_dif && data_div &&
670             adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
671                 mask |= SHOST_DIX_TYPE1_PROTECTION;
672                 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
673                 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
674                 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
675                 shost->max_sectors = shost->sg_tablesize * 8;
676         }
677
678         scsi_host_set_prot(shost, mask);
679 }
680
681 /**
682  * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
683  * @scmd: The SCSI command to report the error for
684  * @ascq: The ASCQ to put in the sense buffer
685  *
686  * See the error handling in sd_done for the sense codes used here.
687  * Set DID_SOFT_ERROR to retry the request, if possible.
688  */
689 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
690 {
691         scsi_build_sense_buffer(1, scmd->sense_buffer,
692                                 ILLEGAL_REQUEST, 0x10, ascq);
693         set_driver_byte(scmd, DRIVER_SENSE);
694         scmd->result |= SAM_STAT_CHECK_CONDITION;
695         set_host_byte(scmd, DID_SOFT_ERROR);
696 }
697
698 struct fc_function_template zfcp_transport_functions = {
699         .show_starget_port_id = 1,
700         .show_starget_port_name = 1,
701         .show_starget_node_name = 1,
702         .show_rport_supported_classes = 1,
703         .show_rport_maxframe_size = 1,
704         .show_rport_dev_loss_tmo = 1,
705         .show_host_node_name = 1,
706         .show_host_port_name = 1,
707         .show_host_permanent_port_name = 1,
708         .show_host_supported_classes = 1,
709         .show_host_supported_fc4s = 1,
710         .show_host_supported_speeds = 1,
711         .show_host_maxframe_size = 1,
712         .show_host_serial_number = 1,
713         .get_fc_host_stats = zfcp_get_fc_host_stats,
714         .reset_fc_host_stats = zfcp_reset_fc_host_stats,
715         .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
716         .get_host_port_state = zfcp_get_host_port_state,
717         .terminate_rport_io = zfcp_scsi_terminate_rport_io,
718         .show_host_port_state = 1,
719         .show_host_active_fc4s = 1,
720         .bsg_request = zfcp_fc_exec_bsg_job,
721         .bsg_timeout = zfcp_fc_timeout_bsg_job,
722         /* no functions registered for following dynamic attributes but
723            directly set by LLDD */
724         .show_host_port_type = 1,
725         .show_host_symbolic_name = 1,
726         .show_host_speed = 1,
727         .show_host_port_id = 1,
728         .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
729 };