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
zfcp_scsi_slave_destroy(struct scsi_device * sdev)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
zfcp_scsi_slave_configure(struct scsi_device * sdp)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
zfcp_scsi_command_fail(struct scsi_cmnd * scpnt,int result)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 scpnt->scsi_done(scpnt);
64 }
65
66 static
zfcp_scsi_queuecommand(struct Scsi_Host * shost,struct scsi_cmnd * scpnt)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 scpnt->scsi_done(scpnt);
82 return 0;
83 }
84
85 status = atomic_read(&zfcp_sdev->status);
86 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
87 !(atomic_read(&zfcp_sdev->port->status) &
88 ZFCP_STATUS_COMMON_ERP_FAILED)) {
89 /* only LUN access denied, but port is good
90 * not covered by FC transport, have to fail here */
91 zfcp_scsi_command_fail(scpnt, DID_ERROR);
92 return 0;
93 }
94
95 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
96 /* This could be
97 * call to rport_delete pending: mimic retry from
98 * fc_remote_port_chkready until rport is BLOCKED
99 */
100 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
101 return 0;
102 }
103
104 ret = zfcp_fsf_fcp_cmnd(scpnt);
105 if (unlikely(ret == -EBUSY))
106 return SCSI_MLQUEUE_DEVICE_BUSY;
107 else if (unlikely(ret < 0))
108 return SCSI_MLQUEUE_HOST_BUSY;
109
110 return ret;
111 }
112
zfcp_scsi_slave_alloc(struct scsi_device * sdev)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
zfcp_scsi_eh_abort_handler(struct scsi_cmnd * scpnt)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
zfcp_scsi_forget_cmnd(struct zfcp_fsf_req * old_req,void * data)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
zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev * zsdev,u8 tm_flags)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 */
zfcp_scsi_task_mgmt_function(struct scsi_device * sdev,u8 tm_flags)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
zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd * scpnt)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
zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd * scpnt)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
zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd * scpnt)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 */
zfcp_scsi_sysfs_host_reset(struct Scsi_Host * shost,int reset_type)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_attrs = zfcp_sysfs_shost_attrs,
448 .sdev_attrs = zfcp_sysfs_sdev_attrs,
449 .track_queue_depth = 1,
450 .supported_mode = MODE_INITIATOR,
451 };
452
453 /**
454 * zfcp_scsi_adapter_register() - Allocate and register SCSI and FC host with
455 * SCSI midlayer
456 * @adapter: The zfcp adapter to register with the SCSI midlayer
457 *
458 * Allocates the SCSI host object for the given adapter, sets basic properties
459 * (such as the transport template, QDIO limits, ...), and registers it with
460 * the midlayer.
461 *
462 * During registration with the midlayer the corresponding FC host object for
463 * the referenced transport class is also implicitely allocated.
464 *
465 * Upon success adapter->scsi_host is set, and upon failure it remains NULL. If
466 * adapter->scsi_host is already set, nothing is done.
467 *
468 * Return:
469 * * 0 - Allocation and registration was successful
470 * * -EEXIST - SCSI and FC host did already exist, nothing was done, nothing
471 * was changed
472 * * -EIO - Allocation or registration failed
473 */
zfcp_scsi_adapter_register(struct zfcp_adapter * adapter)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 */
zfcp_scsi_adapter_unregister(struct zfcp_adapter * adapter)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*
zfcp_scsi_init_fc_host_stats(struct zfcp_adapter * adapter)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
zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data,struct fsf_qtcb_bottom_port * old)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
zfcp_scsi_set_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data)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 *
zfcp_scsi_get_fc_host_stats(struct Scsi_Host * host)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
zfcp_scsi_reset_fc_host_stats(struct Scsi_Host * shost)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
zfcp_scsi_get_host_port_state(struct Scsi_Host * shost)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
zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport * rport,u32 timeout)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 */
zfcp_scsi_terminate_rport_io(struct fc_rport * rport)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
zfcp_scsi_rport_register(struct zfcp_port * port)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
zfcp_scsi_rport_block(struct zfcp_port * port)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
zfcp_scsi_schedule_rport_register(struct zfcp_port * port)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
zfcp_scsi_schedule_rport_block(struct zfcp_port * port)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
zfcp_scsi_schedule_rports_block(struct zfcp_adapter * adapter)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
zfcp_scsi_rport_work(struct work_struct * work)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 */
zfcp_scsi_set_prot(struct zfcp_adapter * adapter)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 */
zfcp_scsi_dif_sense_error(struct scsi_cmnd * scmd,int ascq)857 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
858 {
859 scsi_build_sense_buffer(1, scmd->sense_buffer,
860 ILLEGAL_REQUEST, 0x10, ascq);
861 set_driver_byte(scmd, DRIVER_SENSE);
862 scmd->result |= SAM_STAT_CHECK_CONDITION;
863 set_host_byte(scmd, DID_SOFT_ERROR);
864 }
865
zfcp_scsi_shost_update_config_data(struct zfcp_adapter * const adapter,const struct fsf_qtcb_bottom_config * const bottom,const bool bottom_incomplete)866 void zfcp_scsi_shost_update_config_data(
867 struct zfcp_adapter *const adapter,
868 const struct fsf_qtcb_bottom_config *const bottom,
869 const bool bottom_incomplete)
870 {
871 struct Scsi_Host *const shost = adapter->scsi_host;
872 const struct fc_els_flogi *nsp, *plogi;
873
874 if (shost == NULL)
875 return;
876
877 snprintf(fc_host_firmware_version(shost), FC_VERSION_STRING_SIZE,
878 "0x%08x", bottom->lic_version);
879
880 if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
881 snprintf(fc_host_hardware_version(shost),
882 FC_VERSION_STRING_SIZE,
883 "0x%08x", bottom->hardware_version);
884 memcpy(fc_host_serial_number(shost), bottom->serial_number,
885 min(FC_SERIAL_NUMBER_SIZE, 17));
886 EBCASC(fc_host_serial_number(shost),
887 min(FC_SERIAL_NUMBER_SIZE, 17));
888 }
889
890 /* adjust pointers for missing command code */
891 nsp = (struct fc_els_flogi *) ((u8 *)&bottom->nport_serv_param
892 - sizeof(u32));
893 plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload
894 - sizeof(u32));
895
896 snprintf(fc_host_manufacturer(shost), FC_SERIAL_NUMBER_SIZE, "%s",
897 "IBM");
898 fc_host_port_name(shost) = be64_to_cpu(nsp->fl_wwpn);
899 fc_host_node_name(shost) = be64_to_cpu(nsp->fl_wwnn);
900 fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
901
902 zfcp_scsi_set_prot(adapter);
903
904 /* do not evaluate invalid fields */
905 if (bottom_incomplete)
906 return;
907
908 fc_host_port_id(shost) = ntoh24(bottom->s_id);
909 fc_host_speed(shost) =
910 zfcp_fsf_convert_portspeed(bottom->fc_link_speed);
911
912 snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x",
913 bottom->adapter_type);
914
915 switch (bottom->fc_topology) {
916 case FSF_TOPO_P2P:
917 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
918 fc_host_fabric_name(shost) = 0;
919 break;
920 case FSF_TOPO_FABRIC:
921 fc_host_fabric_name(shost) = be64_to_cpu(plogi->fl_wwnn);
922 if (bottom->connection_features & FSF_FEATURE_NPIV_MODE)
923 fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
924 else
925 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
926 break;
927 case FSF_TOPO_AL:
928 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
929 fallthrough;
930 default:
931 fc_host_fabric_name(shost) = 0;
932 break;
933 }
934 }
935
zfcp_scsi_shost_update_port_data(struct zfcp_adapter * const adapter,const struct fsf_qtcb_bottom_port * const bottom)936 void zfcp_scsi_shost_update_port_data(
937 struct zfcp_adapter *const adapter,
938 const struct fsf_qtcb_bottom_port *const bottom)
939 {
940 struct Scsi_Host *const shost = adapter->scsi_host;
941
942 if (shost == NULL)
943 return;
944
945 fc_host_permanent_port_name(shost) = bottom->wwpn;
946 fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
947 fc_host_supported_speeds(shost) =
948 zfcp_fsf_convert_portspeed(bottom->supported_speed);
949 memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types,
950 FC_FC4_LIST_SIZE);
951 memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types,
952 FC_FC4_LIST_SIZE);
953 }
954
955 struct fc_function_template zfcp_transport_functions = {
956 .show_starget_port_id = 1,
957 .show_starget_port_name = 1,
958 .show_starget_node_name = 1,
959 .show_rport_supported_classes = 1,
960 .show_rport_maxframe_size = 1,
961 .show_rport_dev_loss_tmo = 1,
962 .show_host_node_name = 1,
963 .show_host_port_name = 1,
964 .show_host_permanent_port_name = 1,
965 .show_host_supported_classes = 1,
966 .show_host_supported_fc4s = 1,
967 .show_host_supported_speeds = 1,
968 .show_host_maxframe_size = 1,
969 .show_host_serial_number = 1,
970 .show_host_manufacturer = 1,
971 .show_host_model = 1,
972 .show_host_hardware_version = 1,
973 .show_host_firmware_version = 1,
974 .get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
975 .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
976 .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
977 .get_host_port_state = zfcp_scsi_get_host_port_state,
978 .terminate_rport_io = zfcp_scsi_terminate_rport_io,
979 .show_host_port_state = 1,
980 .show_host_active_fc4s = 1,
981 .bsg_request = zfcp_fc_exec_bsg_job,
982 .bsg_timeout = zfcp_fc_timeout_bsg_job,
983 /* no functions registered for following dynamic attributes but
984 directly set by LLDD */
985 .show_host_port_type = 1,
986 .show_host_symbolic_name = 1,
987 .show_host_speed = 1,
988 .show_host_port_id = 1,
989 .show_host_fabric_name = 1,
990 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
991 };
992