1 /*
2 * zfcp device driver
3 *
4 * Interface to Linux SCSI midlayer.
5 *
6 * Copyright IBM Corp. 2002, 2013
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
zfcp_scsi_change_queue_depth(struct scsi_device * sdev,int depth,int reason)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
zfcp_scsi_slave_destroy(struct scsi_device * sdev)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
zfcp_scsi_slave_configure(struct scsi_device * sdp)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
zfcp_scsi_command_fail(struct scsi_cmnd * scpnt,int result)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
zfcp_scsi_queuecommand(struct Scsi_Host * shost,struct scsi_cmnd * scpnt)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
zfcp_scsi_slave_alloc(struct scsi_device * sdev)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
zfcp_scsi_eh_abort_handler(struct scsi_cmnd * scpnt)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
zfcp_task_mgmt_function(struct scsi_cmnd * scpnt,u8 tm_flags)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
zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd * scpnt)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
zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd * scpnt)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
zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd * scpnt)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 = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
315 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
316 /* GCD, adjusted later */
317 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
318 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
319 /* GCD, adjusted later */
320 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1,
321 .cmd_per_lun = 1,
322 .use_clustering = 1,
323 .shost_attrs = zfcp_sysfs_shost_attrs,
324 .sdev_attrs = zfcp_sysfs_sdev_attrs,
325 };
326
327 /**
328 * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
329 * @adapter: The zfcp adapter to register with the SCSI midlayer
330 */
zfcp_scsi_adapter_register(struct zfcp_adapter * adapter)331 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
332 {
333 struct ccw_dev_id dev_id;
334
335 if (adapter->scsi_host)
336 return 0;
337
338 ccw_device_get_id(adapter->ccw_device, &dev_id);
339 /* register adapter as SCSI host with mid layer of SCSI stack */
340 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
341 sizeof (struct zfcp_adapter *));
342 if (!adapter->scsi_host) {
343 dev_err(&adapter->ccw_device->dev,
344 "Registering the FCP device with the "
345 "SCSI stack failed\n");
346 return -EIO;
347 }
348
349 /* tell the SCSI stack some characteristics of this adapter */
350 adapter->scsi_host->max_id = 511;
351 adapter->scsi_host->max_lun = 0xFFFFFFFF;
352 adapter->scsi_host->max_channel = 0;
353 adapter->scsi_host->unique_id = dev_id.devno;
354 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
355 adapter->scsi_host->transportt = zfcp_scsi_transport_template;
356
357 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
358
359 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
360 scsi_host_put(adapter->scsi_host);
361 return -EIO;
362 }
363
364 return 0;
365 }
366
367 /**
368 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
369 * @adapter: The zfcp adapter to unregister.
370 */
zfcp_scsi_adapter_unregister(struct zfcp_adapter * adapter)371 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
372 {
373 struct Scsi_Host *shost;
374 struct zfcp_port *port;
375
376 shost = adapter->scsi_host;
377 if (!shost)
378 return;
379
380 read_lock_irq(&adapter->port_list_lock);
381 list_for_each_entry(port, &adapter->port_list, list)
382 port->rport = NULL;
383 read_unlock_irq(&adapter->port_list_lock);
384
385 fc_remove_host(shost);
386 scsi_remove_host(shost);
387 scsi_host_put(shost);
388 adapter->scsi_host = NULL;
389 }
390
391 static struct fc_host_statistics*
zfcp_init_fc_host_stats(struct zfcp_adapter * adapter)392 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
393 {
394 struct fc_host_statistics *fc_stats;
395
396 if (!adapter->fc_stats) {
397 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
398 if (!fc_stats)
399 return NULL;
400 adapter->fc_stats = fc_stats; /* freed in adapter_release */
401 }
402 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
403 return adapter->fc_stats;
404 }
405
zfcp_adjust_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data,struct fsf_qtcb_bottom_port * old)406 static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
407 struct fsf_qtcb_bottom_port *data,
408 struct fsf_qtcb_bottom_port *old)
409 {
410 fc_stats->seconds_since_last_reset =
411 data->seconds_since_last_reset - old->seconds_since_last_reset;
412 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
413 fc_stats->tx_words = data->tx_words - old->tx_words;
414 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
415 fc_stats->rx_words = data->rx_words - old->rx_words;
416 fc_stats->lip_count = data->lip - old->lip;
417 fc_stats->nos_count = data->nos - old->nos;
418 fc_stats->error_frames = data->error_frames - old->error_frames;
419 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
420 fc_stats->link_failure_count = data->link_failure - old->link_failure;
421 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
422 fc_stats->loss_of_signal_count =
423 data->loss_of_signal - old->loss_of_signal;
424 fc_stats->prim_seq_protocol_err_count =
425 data->psp_error_counts - old->psp_error_counts;
426 fc_stats->invalid_tx_word_count =
427 data->invalid_tx_words - old->invalid_tx_words;
428 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
429 fc_stats->fcp_input_requests =
430 data->input_requests - old->input_requests;
431 fc_stats->fcp_output_requests =
432 data->output_requests - old->output_requests;
433 fc_stats->fcp_control_requests =
434 data->control_requests - old->control_requests;
435 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
436 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
437 }
438
zfcp_set_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data)439 static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
440 struct fsf_qtcb_bottom_port *data)
441 {
442 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
443 fc_stats->tx_frames = data->tx_frames;
444 fc_stats->tx_words = data->tx_words;
445 fc_stats->rx_frames = data->rx_frames;
446 fc_stats->rx_words = data->rx_words;
447 fc_stats->lip_count = data->lip;
448 fc_stats->nos_count = data->nos;
449 fc_stats->error_frames = data->error_frames;
450 fc_stats->dumped_frames = data->dumped_frames;
451 fc_stats->link_failure_count = data->link_failure;
452 fc_stats->loss_of_sync_count = data->loss_of_sync;
453 fc_stats->loss_of_signal_count = data->loss_of_signal;
454 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
455 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
456 fc_stats->invalid_crc_count = data->invalid_crcs;
457 fc_stats->fcp_input_requests = data->input_requests;
458 fc_stats->fcp_output_requests = data->output_requests;
459 fc_stats->fcp_control_requests = data->control_requests;
460 fc_stats->fcp_input_megabytes = data->input_mb;
461 fc_stats->fcp_output_megabytes = data->output_mb;
462 }
463
zfcp_get_fc_host_stats(struct Scsi_Host * host)464 static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
465 {
466 struct zfcp_adapter *adapter;
467 struct fc_host_statistics *fc_stats;
468 struct fsf_qtcb_bottom_port *data;
469 int ret;
470
471 adapter = (struct zfcp_adapter *)host->hostdata[0];
472 fc_stats = zfcp_init_fc_host_stats(adapter);
473 if (!fc_stats)
474 return NULL;
475
476 data = kzalloc(sizeof(*data), GFP_KERNEL);
477 if (!data)
478 return NULL;
479
480 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
481 if (ret) {
482 kfree(data);
483 return NULL;
484 }
485
486 if (adapter->stats_reset &&
487 ((jiffies/HZ - adapter->stats_reset) <
488 data->seconds_since_last_reset))
489 zfcp_adjust_fc_host_stats(fc_stats, data,
490 adapter->stats_reset_data);
491 else
492 zfcp_set_fc_host_stats(fc_stats, data);
493
494 kfree(data);
495 return fc_stats;
496 }
497
zfcp_reset_fc_host_stats(struct Scsi_Host * shost)498 static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
499 {
500 struct zfcp_adapter *adapter;
501 struct fsf_qtcb_bottom_port *data;
502 int ret;
503
504 adapter = (struct zfcp_adapter *)shost->hostdata[0];
505 data = kzalloc(sizeof(*data), GFP_KERNEL);
506 if (!data)
507 return;
508
509 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
510 if (ret)
511 kfree(data);
512 else {
513 adapter->stats_reset = jiffies/HZ;
514 kfree(adapter->stats_reset_data);
515 adapter->stats_reset_data = data; /* finally freed in
516 adapter_release */
517 }
518 }
519
zfcp_get_host_port_state(struct Scsi_Host * shost)520 static void zfcp_get_host_port_state(struct Scsi_Host *shost)
521 {
522 struct zfcp_adapter *adapter =
523 (struct zfcp_adapter *)shost->hostdata[0];
524 int status = atomic_read(&adapter->status);
525
526 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
527 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
528 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
529 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
530 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
531 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
532 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
533 else
534 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
535 }
536
zfcp_set_rport_dev_loss_tmo(struct fc_rport * rport,u32 timeout)537 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
538 {
539 rport->dev_loss_tmo = timeout;
540 }
541
542 /**
543 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
544 * @rport: The FC rport where to teminate I/O
545 *
546 * Abort all pending SCSI commands for a port by closing the
547 * port. Using a reopen avoids a conflict with a shutdown
548 * overwriting a reopen. The "forced" ensures that a disappeared port
549 * is not opened again as valid due to the cached plogi data in
550 * non-NPIV mode.
551 */
zfcp_scsi_terminate_rport_io(struct fc_rport * rport)552 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
553 {
554 struct zfcp_port *port;
555 struct Scsi_Host *shost = rport_to_shost(rport);
556 struct zfcp_adapter *adapter =
557 (struct zfcp_adapter *)shost->hostdata[0];
558
559 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
560
561 if (port) {
562 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
563 put_device(&port->dev);
564 }
565 }
566
zfcp_scsi_rport_register(struct zfcp_port * port)567 static void zfcp_scsi_rport_register(struct zfcp_port *port)
568 {
569 struct fc_rport_identifiers ids;
570 struct fc_rport *rport;
571
572 if (port->rport)
573 return;
574
575 ids.node_name = port->wwnn;
576 ids.port_name = port->wwpn;
577 ids.port_id = port->d_id;
578 ids.roles = FC_RPORT_ROLE_FCP_TARGET;
579
580 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
581 if (!rport) {
582 dev_err(&port->adapter->ccw_device->dev,
583 "Registering port 0x%016Lx failed\n",
584 (unsigned long long)port->wwpn);
585 return;
586 }
587
588 rport->maxframe_size = port->maxframe_size;
589 rport->supported_classes = port->supported_classes;
590 port->rport = rport;
591 port->starget_id = rport->scsi_target_id;
592
593 zfcp_unit_queue_scsi_scan(port);
594 }
595
zfcp_scsi_rport_block(struct zfcp_port * port)596 static void zfcp_scsi_rport_block(struct zfcp_port *port)
597 {
598 struct fc_rport *rport = port->rport;
599
600 if (rport) {
601 fc_remote_port_delete(rport);
602 port->rport = NULL;
603 }
604 }
605
zfcp_scsi_schedule_rport_register(struct zfcp_port * port)606 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
607 {
608 get_device(&port->dev);
609 port->rport_task = RPORT_ADD;
610
611 if (!queue_work(port->adapter->work_queue, &port->rport_work))
612 put_device(&port->dev);
613 }
614
zfcp_scsi_schedule_rport_block(struct zfcp_port * port)615 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
616 {
617 get_device(&port->dev);
618 port->rport_task = RPORT_DEL;
619
620 if (port->rport && queue_work(port->adapter->work_queue,
621 &port->rport_work))
622 return;
623
624 put_device(&port->dev);
625 }
626
zfcp_scsi_schedule_rports_block(struct zfcp_adapter * adapter)627 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
628 {
629 unsigned long flags;
630 struct zfcp_port *port;
631
632 read_lock_irqsave(&adapter->port_list_lock, flags);
633 list_for_each_entry(port, &adapter->port_list, list)
634 zfcp_scsi_schedule_rport_block(port);
635 read_unlock_irqrestore(&adapter->port_list_lock, flags);
636 }
637
zfcp_scsi_rport_work(struct work_struct * work)638 void zfcp_scsi_rport_work(struct work_struct *work)
639 {
640 struct zfcp_port *port = container_of(work, struct zfcp_port,
641 rport_work);
642
643 while (port->rport_task) {
644 if (port->rport_task == RPORT_ADD) {
645 port->rport_task = RPORT_NONE;
646 zfcp_scsi_rport_register(port);
647 } else {
648 port->rport_task = RPORT_NONE;
649 zfcp_scsi_rport_block(port);
650 }
651 }
652
653 put_device(&port->dev);
654 }
655
656 /**
657 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
658 * @adapter: The adapter where to configure DIF/DIX for the SCSI host
659 */
zfcp_scsi_set_prot(struct zfcp_adapter * adapter)660 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
661 {
662 unsigned int mask = 0;
663 unsigned int data_div;
664 struct Scsi_Host *shost = adapter->scsi_host;
665
666 data_div = atomic_read(&adapter->status) &
667 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
668
669 if (enable_dif &&
670 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
671 mask |= SHOST_DIF_TYPE1_PROTECTION;
672
673 if (enable_dif && data_div &&
674 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
675 mask |= SHOST_DIX_TYPE1_PROTECTION;
676 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
677 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
678 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
679 shost->max_sectors = shost->sg_tablesize * 8;
680 }
681
682 scsi_host_set_prot(shost, mask);
683 }
684
685 /**
686 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
687 * @scmd: The SCSI command to report the error for
688 * @ascq: The ASCQ to put in the sense buffer
689 *
690 * See the error handling in sd_done for the sense codes used here.
691 * Set DID_SOFT_ERROR to retry the request, if possible.
692 */
zfcp_scsi_dif_sense_error(struct scsi_cmnd * scmd,int ascq)693 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
694 {
695 scsi_build_sense_buffer(1, scmd->sense_buffer,
696 ILLEGAL_REQUEST, 0x10, ascq);
697 set_driver_byte(scmd, DRIVER_SENSE);
698 scmd->result |= SAM_STAT_CHECK_CONDITION;
699 set_host_byte(scmd, DID_SOFT_ERROR);
700 }
701
702 struct fc_function_template zfcp_transport_functions = {
703 .show_starget_port_id = 1,
704 .show_starget_port_name = 1,
705 .show_starget_node_name = 1,
706 .show_rport_supported_classes = 1,
707 .show_rport_maxframe_size = 1,
708 .show_rport_dev_loss_tmo = 1,
709 .show_host_node_name = 1,
710 .show_host_port_name = 1,
711 .show_host_permanent_port_name = 1,
712 .show_host_supported_classes = 1,
713 .show_host_supported_fc4s = 1,
714 .show_host_supported_speeds = 1,
715 .show_host_maxframe_size = 1,
716 .show_host_serial_number = 1,
717 .get_fc_host_stats = zfcp_get_fc_host_stats,
718 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
719 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
720 .get_host_port_state = zfcp_get_host_port_state,
721 .terminate_rport_io = zfcp_scsi_terminate_rport_io,
722 .show_host_port_state = 1,
723 .show_host_active_fc4s = 1,
724 .bsg_request = zfcp_fc_exec_bsg_job,
725 .bsg_timeout = zfcp_fc_timeout_bsg_job,
726 /* no functions registered for following dynamic attributes but
727 directly set by LLDD */
728 .show_host_port_type = 1,
729 .show_host_symbolic_name = 1,
730 .show_host_speed = 1,
731 .show_host_port_id = 1,
732 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
733 };
734