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