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_sdev_destroy(struct scsi_device * sdev)40 static void zfcp_scsi_sdev_destroy(struct scsi_device *sdev)
41 {
42 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
43
44 /* if previous sdev_init 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_sdev_configure(struct scsi_device * sdp,struct queue_limits * lim)52 static int zfcp_scsi_sdev_configure(struct scsi_device *sdp,
53 struct queue_limits *lim)
54 {
55 if (sdp->tagged_supported)
56 scsi_change_queue_depth(sdp, default_depth);
57 return 0;
58 }
59
zfcp_scsi_command_fail(struct scsi_cmnd * scpnt,int result)60 static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
61 {
62 set_host_byte(scpnt, result);
63 zfcp_dbf_scsi_fail_send(scpnt);
64 scsi_done(scpnt);
65 }
66
67 static
zfcp_scsi_queuecommand(struct Scsi_Host * shost,struct scsi_cmnd * scpnt)68 int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
69 {
70 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
71 struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
72 int status, scsi_result, ret;
73
74 /* reset the status for this request */
75 scpnt->result = 0;
76 scpnt->host_scribble = NULL;
77
78 scsi_result = fc_remote_port_chkready(rport);
79 if (unlikely(scsi_result)) {
80 scpnt->result = scsi_result;
81 zfcp_dbf_scsi_fail_send(scpnt);
82 scsi_done(scpnt);
83 return 0;
84 }
85
86 status = atomic_read(&zfcp_sdev->status);
87 if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
88 !(atomic_read(&zfcp_sdev->port->status) &
89 ZFCP_STATUS_COMMON_ERP_FAILED)) {
90 /* only LUN access denied, but port is good
91 * not covered by FC transport, have to fail here */
92 zfcp_scsi_command_fail(scpnt, DID_ERROR);
93 return 0;
94 }
95
96 if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
97 /* This could be
98 * call to rport_delete pending: mimic retry from
99 * fc_remote_port_chkready until rport is BLOCKED
100 */
101 zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
102 return 0;
103 }
104
105 ret = zfcp_fsf_fcp_cmnd(scpnt);
106 if (unlikely(ret == -EBUSY))
107 return SCSI_MLQUEUE_DEVICE_BUSY;
108 else if (unlikely(ret < 0))
109 return SCSI_MLQUEUE_HOST_BUSY;
110
111 return ret;
112 }
113
zfcp_scsi_sdev_init(struct scsi_device * sdev)114 static int zfcp_scsi_sdev_init(struct scsi_device *sdev)
115 {
116 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
117 struct zfcp_adapter *adapter =
118 (struct zfcp_adapter *) sdev->host->hostdata[0];
119 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
120 struct zfcp_port *port;
121 struct zfcp_unit *unit;
122 int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
123
124 zfcp_sdev->erp_action.adapter = adapter;
125 zfcp_sdev->erp_action.sdev = sdev;
126
127 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
128 if (!port)
129 return -ENXIO;
130
131 zfcp_sdev->erp_action.port = port;
132
133 mutex_lock(&zfcp_sysfs_port_units_mutex);
134 if (zfcp_sysfs_port_is_removing(port)) {
135 /* port is already gone */
136 mutex_unlock(&zfcp_sysfs_port_units_mutex);
137 put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */
138 return -ENXIO;
139 }
140 mutex_unlock(&zfcp_sysfs_port_units_mutex);
141
142 unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
143 if (unit)
144 put_device(&unit->dev);
145
146 if (!unit && !(allow_lun_scan && npiv)) {
147 put_device(&port->dev);
148 return -ENXIO;
149 }
150
151 zfcp_sdev->port = port;
152 zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
153 zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
154 zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
155 zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
156 zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
157 zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
158 spin_lock_init(&zfcp_sdev->latencies.lock);
159
160 zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
161 zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
162 zfcp_erp_wait(port->adapter);
163
164 return 0;
165 }
166
zfcp_scsi_eh_abort_handler(struct scsi_cmnd * scpnt)167 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
168 {
169 struct Scsi_Host *scsi_host = scpnt->device->host;
170 struct zfcp_adapter *adapter =
171 (struct zfcp_adapter *) scsi_host->hostdata[0];
172 struct zfcp_fsf_req *old_req, *abrt_req;
173 unsigned long flags;
174 u64 old_reqid = (u64) scpnt->host_scribble;
175 int retval = SUCCESS, ret;
176 int retry = 3;
177 char *dbf_tag;
178
179 /* avoid race condition between late normal completion and abort */
180 write_lock_irqsave(&adapter->abort_lock, flags);
181
182 old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
183 if (!old_req) {
184 write_unlock_irqrestore(&adapter->abort_lock, flags);
185 zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
186 return FAILED; /* completion could be in progress */
187 }
188 old_req->data = NULL;
189
190 /* don't access old fsf_req after releasing the abort_lock */
191 write_unlock_irqrestore(&adapter->abort_lock, flags);
192
193 while (retry--) {
194 abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
195 if (abrt_req)
196 break;
197
198 zfcp_dbf_scsi_abort("abrt_wt", scpnt, NULL);
199 zfcp_erp_wait(adapter);
200 ret = fc_block_scsi_eh(scpnt);
201 if (ret) {
202 zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
203 return ret;
204 }
205 if (!(atomic_read(&adapter->status) &
206 ZFCP_STATUS_COMMON_RUNNING)) {
207 zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
208 return SUCCESS;
209 }
210 }
211 if (!abrt_req) {
212 zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
213 return FAILED;
214 }
215
216 wait_for_completion(&abrt_req->completion);
217
218 if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
219 dbf_tag = "abrt_ok";
220 else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
221 dbf_tag = "abrt_nn";
222 else {
223 dbf_tag = "abrt_fa";
224 retval = FAILED;
225 }
226 zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
227 zfcp_fsf_req_free(abrt_req);
228 return retval;
229 }
230
231 struct zfcp_scsi_req_filter {
232 u8 tmf_scope;
233 u32 lun_handle;
234 u32 port_handle;
235 };
236
zfcp_scsi_forget_cmnd(struct zfcp_fsf_req * old_req,void * data)237 static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
238 {
239 struct zfcp_scsi_req_filter *filter =
240 (struct zfcp_scsi_req_filter *)data;
241
242 /* already aborted - prevent side-effects - or not a SCSI command */
243 if (old_req->data == NULL ||
244 zfcp_fsf_req_is_status_read_buffer(old_req) ||
245 old_req->qtcb->header.fsf_command != FSF_QTCB_FCP_CMND)
246 return;
247
248 /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
249 if (old_req->qtcb->header.port_handle != filter->port_handle)
250 return;
251
252 if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
253 old_req->qtcb->header.lun_handle != filter->lun_handle)
254 return;
255
256 zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
257 old_req->data = NULL;
258 }
259
zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev * zsdev,u8 tm_flags)260 static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
261 {
262 struct zfcp_adapter *adapter = zsdev->port->adapter;
263 struct zfcp_scsi_req_filter filter = {
264 .tmf_scope = FCP_TMF_TGT_RESET,
265 .port_handle = zsdev->port->handle,
266 };
267 unsigned long flags;
268
269 if (tm_flags == FCP_TMF_LUN_RESET) {
270 filter.tmf_scope = FCP_TMF_LUN_RESET;
271 filter.lun_handle = zsdev->lun_handle;
272 }
273
274 /*
275 * abort_lock secures against other processings - in the abort-function
276 * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
277 */
278 write_lock_irqsave(&adapter->abort_lock, flags);
279 zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
280 &filter);
281 write_unlock_irqrestore(&adapter->abort_lock, flags);
282 }
283
284 /**
285 * zfcp_scsi_task_mgmt_function() - Send a task management function (sync).
286 * @sdev: Pointer to SCSI device to send the task management command to.
287 * @tm_flags: Task management flags,
288 * here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
289 */
zfcp_scsi_task_mgmt_function(struct scsi_device * sdev,u8 tm_flags)290 static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
291 {
292 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
293 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
294 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
295 struct zfcp_fsf_req *fsf_req = NULL;
296 int retval = SUCCESS, ret;
297 int retry = 3;
298
299 while (retry--) {
300 fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags);
301 if (fsf_req)
302 break;
303
304 zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
305 zfcp_erp_wait(adapter);
306 ret = fc_block_rport(rport);
307 if (ret) {
308 zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
309 return ret;
310 }
311
312 if (!(atomic_read(&adapter->status) &
313 ZFCP_STATUS_COMMON_RUNNING)) {
314 zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
315 return SUCCESS;
316 }
317 }
318 if (!fsf_req) {
319 zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
320 return FAILED;
321 }
322
323 wait_for_completion(&fsf_req->completion);
324
325 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
326 zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
327 retval = FAILED;
328 } else {
329 zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
330 zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
331 }
332
333 zfcp_fsf_req_free(fsf_req);
334 return retval;
335 }
336
zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd * scpnt)337 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
338 {
339 struct scsi_device *sdev = scpnt->device;
340
341 return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
342 }
343
zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd * scpnt)344 static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
345 {
346 struct scsi_target *starget = scsi_target(scpnt->device);
347 struct fc_rport *rport = starget_to_rport(starget);
348 struct Scsi_Host *shost = rport_to_shost(rport);
349 struct scsi_device *sdev = NULL, *tmp_sdev;
350 struct zfcp_adapter *adapter =
351 (struct zfcp_adapter *)shost->hostdata[0];
352 int ret;
353
354 shost_for_each_device(tmp_sdev, shost) {
355 if (tmp_sdev->id == starget->id) {
356 sdev = tmp_sdev;
357 break;
358 }
359 }
360 if (!sdev) {
361 ret = FAILED;
362 zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
363 return ret;
364 }
365
366 ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
367
368 /* release reference from above shost_for_each_device */
369 if (sdev)
370 scsi_device_put(tmp_sdev);
371
372 return ret;
373 }
374
zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd * scpnt)375 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
376 {
377 struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
378 struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
379 int ret = SUCCESS, fc_ret;
380
381 if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) {
382 zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p");
383 zfcp_erp_wait(adapter);
384 }
385 zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
386 zfcp_erp_wait(adapter);
387 fc_ret = fc_block_scsi_eh(scpnt);
388 if (fc_ret)
389 ret = fc_ret;
390
391 zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
392 return ret;
393 }
394
395 /**
396 * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
397 * @shost: Pointer to Scsi_Host to perform action on.
398 * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
399 *
400 * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
401 *
402 * This is similar to zfcp_sysfs_adapter_failed_store().
403 */
zfcp_scsi_sysfs_host_reset(struct Scsi_Host * shost,int reset_type)404 static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
405 {
406 struct zfcp_adapter *adapter =
407 (struct zfcp_adapter *)shost->hostdata[0];
408 int ret = 0;
409
410 if (reset_type != SCSI_ADAPTER_RESET) {
411 ret = -EOPNOTSUPP;
412 zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
413 return ret;
414 }
415
416 zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
417 return ret;
418 }
419
420 struct scsi_transport_template *zfcp_scsi_transport_template;
421
422 static const struct scsi_host_template zfcp_scsi_host_template = {
423 .module = THIS_MODULE,
424 .name = "zfcp",
425 .queuecommand = zfcp_scsi_queuecommand,
426 .eh_timed_out = fc_eh_timed_out,
427 .eh_abort_handler = zfcp_scsi_eh_abort_handler,
428 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
429 .eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
430 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
431 .sdev_init = zfcp_scsi_sdev_init,
432 .sdev_configure = zfcp_scsi_sdev_configure,
433 .sdev_destroy = zfcp_scsi_sdev_destroy,
434 .change_queue_depth = scsi_change_queue_depth,
435 .host_reset = zfcp_scsi_sysfs_host_reset,
436 .proc_name = "zfcp",
437 .can_queue = 4096,
438 .this_id = -1,
439 .sg_tablesize = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
440 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
441 /* GCD, adjusted later */
442 .max_sectors = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
443 * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
444 /* GCD, adjusted later */
445 /* report size limit per scatter-gather segment */
446 .max_segment_size = ZFCP_QDIO_SBALE_LEN,
447 .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1,
448 .shost_groups = zfcp_sysfs_shost_attr_groups,
449 .sdev_groups = zfcp_sysfs_sdev_attr_groups,
450 .track_queue_depth = 1,
451 .supported_mode = MODE_INITIATOR,
452 };
453
454 /**
455 * zfcp_scsi_adapter_register() - Allocate and register SCSI and FC host with
456 * SCSI midlayer
457 * @adapter: The zfcp adapter to register with the SCSI midlayer
458 *
459 * Allocates the SCSI host object for the given adapter, sets basic properties
460 * (such as the transport template, QDIO limits, ...), and registers it with
461 * the midlayer.
462 *
463 * During registration with the midlayer the corresponding FC host object for
464 * the referenced transport class is also implicitely allocated.
465 *
466 * Upon success adapter->scsi_host is set, and upon failure it remains NULL. If
467 * adapter->scsi_host is already set, nothing is done.
468 *
469 * Return:
470 * * 0 - Allocation and registration was successful
471 * * -EEXIST - SCSI and FC host did already exist, nothing was done, nothing
472 * was changed
473 * * -EIO - Allocation or registration failed
474 */
zfcp_scsi_adapter_register(struct zfcp_adapter * adapter)475 int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
476 {
477 struct ccw_dev_id dev_id;
478
479 if (adapter->scsi_host)
480 return -EEXIST;
481
482 ccw_device_get_id(adapter->ccw_device, &dev_id);
483 /* register adapter as SCSI host with mid layer of SCSI stack */
484 adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
485 sizeof (struct zfcp_adapter *));
486 if (!adapter->scsi_host)
487 goto err_out;
488
489 /* tell the SCSI stack some characteristics of this adapter */
490 adapter->scsi_host->max_id = 511;
491 adapter->scsi_host->max_lun = 0xFFFFFFFF;
492 adapter->scsi_host->max_channel = 0;
493 adapter->scsi_host->unique_id = dev_id.devno;
494 adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
495 adapter->scsi_host->transportt = zfcp_scsi_transport_template;
496
497 /* make all basic properties known at registration time */
498 zfcp_qdio_shost_update(adapter, adapter->qdio);
499 zfcp_scsi_set_prot(adapter);
500
501 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
502
503 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
504 scsi_host_put(adapter->scsi_host);
505 goto err_out;
506 }
507
508 return 0;
509 err_out:
510 adapter->scsi_host = NULL;
511 dev_err(&adapter->ccw_device->dev,
512 "Registering the FCP device with the SCSI stack failed\n");
513 return -EIO;
514 }
515
516 /**
517 * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
518 * @adapter: The zfcp adapter to unregister.
519 */
zfcp_scsi_adapter_unregister(struct zfcp_adapter * adapter)520 void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
521 {
522 struct Scsi_Host *shost;
523 struct zfcp_port *port;
524
525 shost = adapter->scsi_host;
526 if (!shost)
527 return;
528
529 read_lock_irq(&adapter->port_list_lock);
530 list_for_each_entry(port, &adapter->port_list, list)
531 port->rport = NULL;
532 read_unlock_irq(&adapter->port_list_lock);
533
534 fc_remove_host(shost);
535 scsi_remove_host(shost);
536 scsi_host_put(shost);
537 adapter->scsi_host = NULL;
538 }
539
540 static struct fc_host_statistics*
zfcp_scsi_init_fc_host_stats(struct zfcp_adapter * adapter)541 zfcp_scsi_init_fc_host_stats(struct zfcp_adapter *adapter)
542 {
543 struct fc_host_statistics *fc_stats;
544
545 if (!adapter->fc_stats) {
546 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
547 if (!fc_stats)
548 return NULL;
549 adapter->fc_stats = fc_stats; /* freed in adapter_release */
550 }
551 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
552 return adapter->fc_stats;
553 }
554
zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data,struct fsf_qtcb_bottom_port * old)555 static void zfcp_scsi_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
556 struct fsf_qtcb_bottom_port *data,
557 struct fsf_qtcb_bottom_port *old)
558 {
559 fc_stats->seconds_since_last_reset =
560 data->seconds_since_last_reset - old->seconds_since_last_reset;
561 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
562 fc_stats->tx_words = data->tx_words - old->tx_words;
563 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
564 fc_stats->rx_words = data->rx_words - old->rx_words;
565 fc_stats->lip_count = data->lip - old->lip;
566 fc_stats->nos_count = data->nos - old->nos;
567 fc_stats->error_frames = data->error_frames - old->error_frames;
568 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
569 fc_stats->link_failure_count = data->link_failure - old->link_failure;
570 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
571 fc_stats->loss_of_signal_count =
572 data->loss_of_signal - old->loss_of_signal;
573 fc_stats->prim_seq_protocol_err_count =
574 data->psp_error_counts - old->psp_error_counts;
575 fc_stats->invalid_tx_word_count =
576 data->invalid_tx_words - old->invalid_tx_words;
577 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
578 fc_stats->fcp_input_requests =
579 data->input_requests - old->input_requests;
580 fc_stats->fcp_output_requests =
581 data->output_requests - old->output_requests;
582 fc_stats->fcp_control_requests =
583 data->control_requests - old->control_requests;
584 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
585 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
586 }
587
zfcp_scsi_set_fc_host_stats(struct fc_host_statistics * fc_stats,struct fsf_qtcb_bottom_port * data)588 static void zfcp_scsi_set_fc_host_stats(struct fc_host_statistics *fc_stats,
589 struct fsf_qtcb_bottom_port *data)
590 {
591 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
592 fc_stats->tx_frames = data->tx_frames;
593 fc_stats->tx_words = data->tx_words;
594 fc_stats->rx_frames = data->rx_frames;
595 fc_stats->rx_words = data->rx_words;
596 fc_stats->lip_count = data->lip;
597 fc_stats->nos_count = data->nos;
598 fc_stats->error_frames = data->error_frames;
599 fc_stats->dumped_frames = data->dumped_frames;
600 fc_stats->link_failure_count = data->link_failure;
601 fc_stats->loss_of_sync_count = data->loss_of_sync;
602 fc_stats->loss_of_signal_count = data->loss_of_signal;
603 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
604 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
605 fc_stats->invalid_crc_count = data->invalid_crcs;
606 fc_stats->fcp_input_requests = data->input_requests;
607 fc_stats->fcp_output_requests = data->output_requests;
608 fc_stats->fcp_control_requests = data->control_requests;
609 fc_stats->fcp_input_megabytes = data->input_mb;
610 fc_stats->fcp_output_megabytes = data->output_mb;
611 }
612
613 static struct fc_host_statistics *
zfcp_scsi_get_fc_host_stats(struct Scsi_Host * host)614 zfcp_scsi_get_fc_host_stats(struct Scsi_Host *host)
615 {
616 struct zfcp_adapter *adapter;
617 struct fc_host_statistics *fc_stats;
618 struct fsf_qtcb_bottom_port *data;
619 int ret;
620
621 adapter = (struct zfcp_adapter *)host->hostdata[0];
622 fc_stats = zfcp_scsi_init_fc_host_stats(adapter);
623 if (!fc_stats)
624 return NULL;
625
626 data = kzalloc(sizeof(*data), GFP_KERNEL);
627 if (!data)
628 return NULL;
629
630 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
631 if (ret != 0 && ret != -EAGAIN) {
632 kfree(data);
633 return NULL;
634 }
635
636 if (adapter->stats_reset &&
637 ((jiffies/HZ - adapter->stats_reset) <
638 data->seconds_since_last_reset))
639 zfcp_scsi_adjust_fc_host_stats(fc_stats, data,
640 adapter->stats_reset_data);
641 else
642 zfcp_scsi_set_fc_host_stats(fc_stats, data);
643
644 kfree(data);
645 return fc_stats;
646 }
647
zfcp_scsi_reset_fc_host_stats(struct Scsi_Host * shost)648 static void zfcp_scsi_reset_fc_host_stats(struct Scsi_Host *shost)
649 {
650 struct zfcp_adapter *adapter;
651 struct fsf_qtcb_bottom_port *data;
652 int ret;
653
654 adapter = (struct zfcp_adapter *)shost->hostdata[0];
655 data = kzalloc(sizeof(*data), GFP_KERNEL);
656 if (!data)
657 return;
658
659 ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
660 if (ret != 0 && ret != -EAGAIN)
661 kfree(data);
662 else {
663 adapter->stats_reset = jiffies/HZ;
664 kfree(adapter->stats_reset_data);
665 adapter->stats_reset_data = data; /* finally freed in
666 adapter_release */
667 }
668 }
669
zfcp_scsi_get_host_port_state(struct Scsi_Host * shost)670 static void zfcp_scsi_get_host_port_state(struct Scsi_Host *shost)
671 {
672 struct zfcp_adapter *adapter =
673 (struct zfcp_adapter *)shost->hostdata[0];
674 int status = atomic_read(&adapter->status);
675
676 if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
677 !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
678 fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
679 else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
680 fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
681 else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
682 fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
683 else
684 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
685 }
686
zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport * rport,u32 timeout)687 static void zfcp_scsi_set_rport_dev_loss_tmo(struct fc_rport *rport,
688 u32 timeout)
689 {
690 rport->dev_loss_tmo = timeout;
691 }
692
693 /**
694 * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
695 * @rport: The FC rport where to teminate I/O
696 *
697 * Abort all pending SCSI commands for a port by closing the
698 * port. Using a reopen avoids a conflict with a shutdown
699 * overwriting a reopen. The "forced" ensures that a disappeared port
700 * is not opened again as valid due to the cached plogi data in
701 * non-NPIV mode.
702 */
zfcp_scsi_terminate_rport_io(struct fc_rport * rport)703 static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
704 {
705 struct zfcp_port *port;
706 struct Scsi_Host *shost = rport_to_shost(rport);
707 struct zfcp_adapter *adapter =
708 (struct zfcp_adapter *)shost->hostdata[0];
709
710 port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
711
712 if (port) {
713 zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
714 put_device(&port->dev);
715 } else {
716 zfcp_erp_port_forced_no_port_dbf(
717 "sctrpin", adapter,
718 rport->port_name /* zfcp_scsi_rport_register */,
719 rport->port_id /* zfcp_scsi_rport_register */);
720 }
721 }
722
zfcp_scsi_rport_register(struct zfcp_port * port)723 static void zfcp_scsi_rport_register(struct zfcp_port *port)
724 {
725 struct fc_rport_identifiers ids;
726 struct fc_rport *rport;
727
728 if (port->rport)
729 return;
730
731 ids.node_name = port->wwnn;
732 ids.port_name = port->wwpn;
733 ids.port_id = port->d_id;
734 ids.roles = FC_RPORT_ROLE_FCP_TARGET;
735
736 zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
737 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
738 ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
739 rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
740 if (!rport) {
741 dev_err(&port->adapter->ccw_device->dev,
742 "Registering port 0x%016Lx failed\n",
743 (unsigned long long)port->wwpn);
744 return;
745 }
746
747 rport->maxframe_size = port->maxframe_size;
748 rport->supported_classes = port->supported_classes;
749 port->rport = rport;
750 port->starget_id = rport->scsi_target_id;
751
752 zfcp_unit_queue_scsi_scan(port);
753 }
754
zfcp_scsi_rport_block(struct zfcp_port * port)755 static void zfcp_scsi_rport_block(struct zfcp_port *port)
756 {
757 struct fc_rport *rport = port->rport;
758
759 if (rport) {
760 zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
761 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
762 ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
763 fc_remote_port_delete(rport);
764 port->rport = NULL;
765 }
766 }
767
zfcp_scsi_schedule_rport_register(struct zfcp_port * port)768 void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
769 {
770 get_device(&port->dev);
771 port->rport_task = RPORT_ADD;
772
773 if (!queue_work(port->adapter->work_queue, &port->rport_work))
774 put_device(&port->dev);
775 }
776
zfcp_scsi_schedule_rport_block(struct zfcp_port * port)777 void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
778 {
779 get_device(&port->dev);
780 port->rport_task = RPORT_DEL;
781
782 if (port->rport && queue_work(port->adapter->work_queue,
783 &port->rport_work))
784 return;
785
786 put_device(&port->dev);
787 }
788
zfcp_scsi_schedule_rports_block(struct zfcp_adapter * adapter)789 void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
790 {
791 unsigned long flags;
792 struct zfcp_port *port;
793
794 read_lock_irqsave(&adapter->port_list_lock, flags);
795 list_for_each_entry(port, &adapter->port_list, list)
796 zfcp_scsi_schedule_rport_block(port);
797 read_unlock_irqrestore(&adapter->port_list_lock, flags);
798 }
799
zfcp_scsi_rport_work(struct work_struct * work)800 void zfcp_scsi_rport_work(struct work_struct *work)
801 {
802 struct zfcp_port *port = container_of(work, struct zfcp_port,
803 rport_work);
804
805 set_worker_desc("zrp%c-%16llx",
806 (port->rport_task == RPORT_ADD) ? 'a' : 'd',
807 port->wwpn); /* < WORKER_DESC_LEN=24 */
808 while (port->rport_task) {
809 if (port->rport_task == RPORT_ADD) {
810 port->rport_task = RPORT_NONE;
811 zfcp_scsi_rport_register(port);
812 } else {
813 port->rport_task = RPORT_NONE;
814 zfcp_scsi_rport_block(port);
815 }
816 }
817
818 put_device(&port->dev);
819 }
820
821 /**
822 * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
823 * @adapter: The adapter where to configure DIF/DIX for the SCSI host
824 */
zfcp_scsi_set_prot(struct zfcp_adapter * adapter)825 void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
826 {
827 unsigned int mask = 0;
828 unsigned int data_div;
829 struct Scsi_Host *shost = adapter->scsi_host;
830
831 data_div = atomic_read(&adapter->status) &
832 ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
833
834 if ((enable_dif || zfcp_experimental_dix) &&
835 adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
836 mask |= SHOST_DIF_TYPE1_PROTECTION;
837
838 if (zfcp_experimental_dix && data_div &&
839 adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
840 mask |= SHOST_DIX_TYPE1_PROTECTION;
841 scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
842 shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
843 shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
844 shost->max_sectors = shost->sg_tablesize * 8;
845 }
846
847 scsi_host_set_prot(shost, mask);
848 }
849
850 /**
851 * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
852 * @scmd: The SCSI command to report the error for
853 * @ascq: The ASCQ to put in the sense buffer
854 *
855 * See the error handling in sd_done for the sense codes used here.
856 * Set DID_SOFT_ERROR to retry the request, if possible.
857 */
zfcp_scsi_dif_sense_error(struct scsi_cmnd * scmd,int ascq)858 void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
859 {
860 scsi_build_sense(scmd, 1, ILLEGAL_REQUEST, 0x10, ascq);
861 set_host_byte(scmd, DID_SOFT_ERROR);
862 }
863
zfcp_scsi_shost_update_config_data(struct zfcp_adapter * const adapter,const struct fsf_qtcb_bottom_config * const bottom,const bool bottom_incomplete)864 void zfcp_scsi_shost_update_config_data(
865 struct zfcp_adapter *const adapter,
866 const struct fsf_qtcb_bottom_config *const bottom,
867 const bool bottom_incomplete)
868 {
869 struct Scsi_Host *const shost = adapter->scsi_host;
870 const struct fc_els_flogi *nsp, *plogi;
871
872 if (shost == NULL)
873 return;
874
875 snprintf(fc_host_firmware_version(shost), FC_VERSION_STRING_SIZE,
876 "0x%08x", bottom->lic_version);
877
878 if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) {
879 snprintf(fc_host_hardware_version(shost),
880 FC_VERSION_STRING_SIZE,
881 "0x%08x", bottom->hardware_version);
882 memcpy(fc_host_serial_number(shost), bottom->serial_number,
883 min(FC_SERIAL_NUMBER_SIZE, 17));
884 EBCASC(fc_host_serial_number(shost),
885 min(FC_SERIAL_NUMBER_SIZE, 17));
886 }
887
888 /* adjust pointers for missing command code */
889 nsp = (struct fc_els_flogi *) ((u8 *)&bottom->nport_serv_param
890 - sizeof(u32));
891 plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload
892 - sizeof(u32));
893
894 snprintf(fc_host_manufacturer(shost), FC_SERIAL_NUMBER_SIZE, "%s",
895 "IBM");
896 fc_host_port_name(shost) = be64_to_cpu(nsp->fl_wwpn);
897 fc_host_node_name(shost) = be64_to_cpu(nsp->fl_wwnn);
898 fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
899
900 zfcp_scsi_set_prot(adapter);
901
902 /* do not evaluate invalid fields */
903 if (bottom_incomplete)
904 return;
905
906 fc_host_port_id(shost) = ntoh24(bottom->s_id);
907 fc_host_speed(shost) =
908 zfcp_fsf_convert_portspeed(bottom->fc_link_speed);
909
910 snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x",
911 bottom->adapter_type);
912
913 switch (bottom->fc_topology) {
914 case FSF_TOPO_P2P:
915 fc_host_port_type(shost) = FC_PORTTYPE_PTP;
916 fc_host_fabric_name(shost) = 0;
917 break;
918 case FSF_TOPO_FABRIC:
919 fc_host_fabric_name(shost) = be64_to_cpu(plogi->fl_wwnn);
920 if (bottom->connection_features & FSF_FEATURE_NPIV_MODE)
921 fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
922 else
923 fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
924 break;
925 case FSF_TOPO_AL:
926 fc_host_port_type(shost) = FC_PORTTYPE_NLPORT;
927 fallthrough;
928 default:
929 fc_host_fabric_name(shost) = 0;
930 break;
931 }
932 }
933
zfcp_scsi_shost_update_port_data(struct zfcp_adapter * const adapter,const struct fsf_qtcb_bottom_port * const bottom)934 void zfcp_scsi_shost_update_port_data(
935 struct zfcp_adapter *const adapter,
936 const struct fsf_qtcb_bottom_port *const bottom)
937 {
938 struct Scsi_Host *const shost = adapter->scsi_host;
939
940 if (shost == NULL)
941 return;
942
943 fc_host_permanent_port_name(shost) = bottom->wwpn;
944 fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
945 fc_host_supported_speeds(shost) =
946 zfcp_fsf_convert_portspeed(bottom->supported_speed);
947 memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types,
948 FC_FC4_LIST_SIZE);
949 memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types,
950 FC_FC4_LIST_SIZE);
951 }
952
953 struct fc_function_template zfcp_transport_functions = {
954 .show_starget_port_id = 1,
955 .show_starget_port_name = 1,
956 .show_starget_node_name = 1,
957 .show_rport_supported_classes = 1,
958 .show_rport_maxframe_size = 1,
959 .show_rport_dev_loss_tmo = 1,
960 .show_host_node_name = 1,
961 .show_host_port_name = 1,
962 .show_host_permanent_port_name = 1,
963 .show_host_supported_classes = 1,
964 .show_host_supported_fc4s = 1,
965 .show_host_supported_speeds = 1,
966 .show_host_maxframe_size = 1,
967 .show_host_serial_number = 1,
968 .show_host_manufacturer = 1,
969 .show_host_model = 1,
970 .show_host_hardware_version = 1,
971 .show_host_firmware_version = 1,
972 .get_fc_host_stats = zfcp_scsi_get_fc_host_stats,
973 .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
974 .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
975 .get_host_port_state = zfcp_scsi_get_host_port_state,
976 .terminate_rport_io = zfcp_scsi_terminate_rport_io,
977 .show_host_port_state = 1,
978 .show_host_active_fc4s = 1,
979 .bsg_request = zfcp_fc_exec_bsg_job,
980 .bsg_timeout = zfcp_fc_timeout_bsg_job,
981 /* no functions registered for following dynamic attributes but
982 directly set by LLDD */
983 .show_host_port_type = 1,
984 .show_host_symbolic_name = 1,
985 .show_host_speed = 1,
986 .show_host_port_id = 1,
987 .show_host_fabric_name = 1,
988 .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
989 };
990