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Merge tag 'trace-fixes-v4.6-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / scsi / scsi_transport_fc.c
1 /*
2 * FiberChannel transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * ========
21 *
22 * Copyright (C) 2004-2007 James Smart, Emulex Corporation
23 * Rewrite for host, target, device, and remote port attributes,
24 * statistics, and service functions...
25 * Add vports, etc
26 *
27 */
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/delay.h>
32 #include <linux/kernel.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_fc.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <net/netlink.h>
39 #include <scsi/scsi_netlink_fc.h>
40 #include <scsi/scsi_bsg_fc.h>
41 #include "scsi_priv.h"
42
43 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
44 static void fc_vport_sched_delete(struct work_struct *work);
45 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
46 struct device *pdev, struct fc_vport_identifiers *ids,
47 struct fc_vport **vport);
48 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
49 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
50 static void fc_bsg_remove(struct request_queue *);
51 static void fc_bsg_goose_queue(struct fc_rport *);
52
53 /*
54 * Module Parameters
55 */
56
57 /*
58 * dev_loss_tmo: the default number of seconds that the FC transport
59 * should insulate the loss of a remote port.
60 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
61 */
62 static unsigned int fc_dev_loss_tmo = 60; /* seconds */
63
64 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
65 MODULE_PARM_DESC(dev_loss_tmo,
66 "Maximum number of seconds that the FC transport should"
67 " insulate the loss of a remote port. Once this value is"
68 " exceeded, the scsi target is removed. Value should be"
69 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
70 " fast_io_fail_tmo is not set.");
71
72 /*
73 * Redefine so that we can have same named attributes in the
74 * sdev/starget/host objects.
75 */
76 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
77 struct device_attribute device_attr_##_prefix##_##_name = \
78 __ATTR(_name,_mode,_show,_store)
79
80 #define fc_enum_name_search(title, table_type, table) \
81 static const char *get_fc_##title##_name(enum table_type table_key) \
82 { \
83 int i; \
84 char *name = NULL; \
85 \
86 for (i = 0; i < ARRAY_SIZE(table); i++) { \
87 if (table[i].value == table_key) { \
88 name = table[i].name; \
89 break; \
90 } \
91 } \
92 return name; \
93 }
94
95 #define fc_enum_name_match(title, table_type, table) \
96 static int get_fc_##title##_match(const char *table_key, \
97 enum table_type *value) \
98 { \
99 int i; \
100 \
101 for (i = 0; i < ARRAY_SIZE(table); i++) { \
102 if (strncmp(table_key, table[i].name, \
103 table[i].matchlen) == 0) { \
104 *value = table[i].value; \
105 return 0; /* success */ \
106 } \
107 } \
108 return 1; /* failure */ \
109 }
110
111
112 /* Convert fc_port_type values to ascii string name */
113 static struct {
114 enum fc_port_type value;
115 char *name;
116 } fc_port_type_names[] = {
117 { FC_PORTTYPE_UNKNOWN, "Unknown" },
118 { FC_PORTTYPE_OTHER, "Other" },
119 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
120 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
121 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
122 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
123 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
124 { FC_PORTTYPE_NPIV, "NPIV VPORT" },
125 };
126 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
127 #define FC_PORTTYPE_MAX_NAMELEN 50
128
129 /* Reuse fc_port_type enum function for vport_type */
130 #define get_fc_vport_type_name get_fc_port_type_name
131
132
133 /* Convert fc_host_event_code values to ascii string name */
134 static const struct {
135 enum fc_host_event_code value;
136 char *name;
137 } fc_host_event_code_names[] = {
138 { FCH_EVT_LIP, "lip" },
139 { FCH_EVT_LINKUP, "link_up" },
140 { FCH_EVT_LINKDOWN, "link_down" },
141 { FCH_EVT_LIPRESET, "lip_reset" },
142 { FCH_EVT_RSCN, "rscn" },
143 { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
144 { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
145 { FCH_EVT_PORT_ONLINE, "port_online" },
146 { FCH_EVT_PORT_OFFLINE, "port_offline" },
147 { FCH_EVT_PORT_FABRIC, "port_fabric" },
148 { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
149 { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
150 };
151 fc_enum_name_search(host_event_code, fc_host_event_code,
152 fc_host_event_code_names)
153 #define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
154
155
156 /* Convert fc_port_state values to ascii string name */
157 static struct {
158 enum fc_port_state value;
159 char *name;
160 } fc_port_state_names[] = {
161 { FC_PORTSTATE_UNKNOWN, "Unknown" },
162 { FC_PORTSTATE_NOTPRESENT, "Not Present" },
163 { FC_PORTSTATE_ONLINE, "Online" },
164 { FC_PORTSTATE_OFFLINE, "Offline" },
165 { FC_PORTSTATE_BLOCKED, "Blocked" },
166 { FC_PORTSTATE_BYPASSED, "Bypassed" },
167 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics" },
168 { FC_PORTSTATE_LINKDOWN, "Linkdown" },
169 { FC_PORTSTATE_ERROR, "Error" },
170 { FC_PORTSTATE_LOOPBACK, "Loopback" },
171 { FC_PORTSTATE_DELETED, "Deleted" },
172 };
173 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
174 #define FC_PORTSTATE_MAX_NAMELEN 20
175
176
177 /* Convert fc_vport_state values to ascii string name */
178 static struct {
179 enum fc_vport_state value;
180 char *name;
181 } fc_vport_state_names[] = {
182 { FC_VPORT_UNKNOWN, "Unknown" },
183 { FC_VPORT_ACTIVE, "Active" },
184 { FC_VPORT_DISABLED, "Disabled" },
185 { FC_VPORT_LINKDOWN, "Linkdown" },
186 { FC_VPORT_INITIALIZING, "Initializing" },
187 { FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
188 { FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
189 { FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
190 { FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
191 { FC_VPORT_FAILED, "VPort Failed" },
192 };
193 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
194 #define FC_VPORTSTATE_MAX_NAMELEN 24
195
196 /* Reuse fc_vport_state enum function for vport_last_state */
197 #define get_fc_vport_last_state_name get_fc_vport_state_name
198
199
200 /* Convert fc_tgtid_binding_type values to ascii string name */
201 static const struct {
202 enum fc_tgtid_binding_type value;
203 char *name;
204 int matchlen;
205 } fc_tgtid_binding_type_names[] = {
206 { FC_TGTID_BIND_NONE, "none", 4 },
207 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
208 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
209 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
210 };
211 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
212 fc_tgtid_binding_type_names)
213 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
214 fc_tgtid_binding_type_names)
215 #define FC_BINDTYPE_MAX_NAMELEN 30
216
217
218 #define fc_bitfield_name_search(title, table) \
219 static ssize_t \
220 get_fc_##title##_names(u32 table_key, char *buf) \
221 { \
222 char *prefix = ""; \
223 ssize_t len = 0; \
224 int i; \
225 \
226 for (i = 0; i < ARRAY_SIZE(table); i++) { \
227 if (table[i].value & table_key) { \
228 len += sprintf(buf + len, "%s%s", \
229 prefix, table[i].name); \
230 prefix = ", "; \
231 } \
232 } \
233 len += sprintf(buf + len, "\n"); \
234 return len; \
235 }
236
237
238 /* Convert FC_COS bit values to ascii string name */
239 static const struct {
240 u32 value;
241 char *name;
242 } fc_cos_names[] = {
243 { FC_COS_CLASS1, "Class 1" },
244 { FC_COS_CLASS2, "Class 2" },
245 { FC_COS_CLASS3, "Class 3" },
246 { FC_COS_CLASS4, "Class 4" },
247 { FC_COS_CLASS6, "Class 6" },
248 };
249 fc_bitfield_name_search(cos, fc_cos_names)
250
251
252 /* Convert FC_PORTSPEED bit values to ascii string name */
253 static const struct {
254 u32 value;
255 char *name;
256 } fc_port_speed_names[] = {
257 { FC_PORTSPEED_1GBIT, "1 Gbit" },
258 { FC_PORTSPEED_2GBIT, "2 Gbit" },
259 { FC_PORTSPEED_4GBIT, "4 Gbit" },
260 { FC_PORTSPEED_10GBIT, "10 Gbit" },
261 { FC_PORTSPEED_8GBIT, "8 Gbit" },
262 { FC_PORTSPEED_16GBIT, "16 Gbit" },
263 { FC_PORTSPEED_32GBIT, "32 Gbit" },
264 { FC_PORTSPEED_20GBIT, "20 Gbit" },
265 { FC_PORTSPEED_40GBIT, "40 Gbit" },
266 { FC_PORTSPEED_50GBIT, "50 Gbit" },
267 { FC_PORTSPEED_100GBIT, "100 Gbit" },
268 { FC_PORTSPEED_25GBIT, "25 Gbit" },
269 { FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
270 };
271 fc_bitfield_name_search(port_speed, fc_port_speed_names)
272
273
274 static int
275 show_fc_fc4s (char *buf, u8 *fc4_list)
276 {
277 int i, len=0;
278
279 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
280 len += sprintf(buf + len , "0x%02x ", *fc4_list);
281 len += sprintf(buf + len, "\n");
282 return len;
283 }
284
285
286 /* Convert FC_PORT_ROLE bit values to ascii string name */
287 static const struct {
288 u32 value;
289 char *name;
290 } fc_port_role_names[] = {
291 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
292 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
293 { FC_PORT_ROLE_IP_PORT, "IP Port" },
294 };
295 fc_bitfield_name_search(port_roles, fc_port_role_names)
296
297 /*
298 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
299 */
300 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
301 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
302 #define FC_FPORT_PORTID 0x00000e
303 #define FC_FABCTLR_PORTID 0x00000d
304 #define FC_DIRSRVR_PORTID 0x00000c
305 #define FC_TIMESRVR_PORTID 0x00000b
306 #define FC_MGMTSRVR_PORTID 0x00000a
307
308
309 static void fc_timeout_deleted_rport(struct work_struct *work);
310 static void fc_timeout_fail_rport_io(struct work_struct *work);
311 static void fc_scsi_scan_rport(struct work_struct *work);
312
313 /*
314 * Attribute counts pre object type...
315 * Increase these values if you add attributes
316 */
317 #define FC_STARGET_NUM_ATTRS 3
318 #define FC_RPORT_NUM_ATTRS 10
319 #define FC_VPORT_NUM_ATTRS 9
320 #define FC_HOST_NUM_ATTRS 29
321
322 struct fc_internal {
323 struct scsi_transport_template t;
324 struct fc_function_template *f;
325
326 /*
327 * For attributes : each object has :
328 * An array of the actual attributes structures
329 * An array of null-terminated pointers to the attribute
330 * structures - used for mid-layer interaction.
331 *
332 * The attribute containers for the starget and host are are
333 * part of the midlayer. As the remote port is specific to the
334 * fc transport, we must provide the attribute container.
335 */
336 struct device_attribute private_starget_attrs[
337 FC_STARGET_NUM_ATTRS];
338 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
339
340 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
341 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
342
343 struct transport_container rport_attr_cont;
344 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
345 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
346
347 struct transport_container vport_attr_cont;
348 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
349 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
350 };
351
352 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
353
354 static int fc_target_setup(struct transport_container *tc, struct device *dev,
355 struct device *cdev)
356 {
357 struct scsi_target *starget = to_scsi_target(dev);
358 struct fc_rport *rport = starget_to_rport(starget);
359
360 /*
361 * if parent is remote port, use values from remote port.
362 * Otherwise, this host uses the fc_transport, but not the
363 * remote port interface. As such, initialize to known non-values.
364 */
365 if (rport) {
366 fc_starget_node_name(starget) = rport->node_name;
367 fc_starget_port_name(starget) = rport->port_name;
368 fc_starget_port_id(starget) = rport->port_id;
369 } else {
370 fc_starget_node_name(starget) = -1;
371 fc_starget_port_name(starget) = -1;
372 fc_starget_port_id(starget) = -1;
373 }
374
375 return 0;
376 }
377
378 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
379 "fc_transport",
380 fc_target_setup,
381 NULL,
382 NULL);
383
384 static int fc_host_setup(struct transport_container *tc, struct device *dev,
385 struct device *cdev)
386 {
387 struct Scsi_Host *shost = dev_to_shost(dev);
388 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
389
390 /*
391 * Set default values easily detected by the midlayer as
392 * failure cases. The scsi lldd is responsible for initializing
393 * all transport attributes to valid values per host.
394 */
395 fc_host->node_name = -1;
396 fc_host->port_name = -1;
397 fc_host->permanent_port_name = -1;
398 fc_host->supported_classes = FC_COS_UNSPECIFIED;
399 memset(fc_host->supported_fc4s, 0,
400 sizeof(fc_host->supported_fc4s));
401 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
402 fc_host->maxframe_size = -1;
403 fc_host->max_npiv_vports = 0;
404 memset(fc_host->serial_number, 0,
405 sizeof(fc_host->serial_number));
406 memset(fc_host->manufacturer, 0,
407 sizeof(fc_host->manufacturer));
408 memset(fc_host->model, 0,
409 sizeof(fc_host->model));
410 memset(fc_host->model_description, 0,
411 sizeof(fc_host->model_description));
412 memset(fc_host->hardware_version, 0,
413 sizeof(fc_host->hardware_version));
414 memset(fc_host->driver_version, 0,
415 sizeof(fc_host->driver_version));
416 memset(fc_host->firmware_version, 0,
417 sizeof(fc_host->firmware_version));
418 memset(fc_host->optionrom_version, 0,
419 sizeof(fc_host->optionrom_version));
420
421 fc_host->port_id = -1;
422 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
423 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
424 memset(fc_host->active_fc4s, 0,
425 sizeof(fc_host->active_fc4s));
426 fc_host->speed = FC_PORTSPEED_UNKNOWN;
427 fc_host->fabric_name = -1;
428 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
429 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
430
431 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
432
433 INIT_LIST_HEAD(&fc_host->rports);
434 INIT_LIST_HEAD(&fc_host->rport_bindings);
435 INIT_LIST_HEAD(&fc_host->vports);
436 fc_host->next_rport_number = 0;
437 fc_host->next_target_id = 0;
438 fc_host->next_vport_number = 0;
439 fc_host->npiv_vports_inuse = 0;
440
441 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
442 "fc_wq_%d", shost->host_no);
443 fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
444 if (!fc_host->work_q)
445 return -ENOMEM;
446
447 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
448 snprintf(fc_host->devloss_work_q_name,
449 sizeof(fc_host->devloss_work_q_name),
450 "fc_dl_%d", shost->host_no);
451 fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
452 fc_host->devloss_work_q_name);
453 if (!fc_host->devloss_work_q) {
454 destroy_workqueue(fc_host->work_q);
455 fc_host->work_q = NULL;
456 return -ENOMEM;
457 }
458
459 fc_bsg_hostadd(shost, fc_host);
460 /* ignore any bsg add error - we just can't do sgio */
461
462 return 0;
463 }
464
465 static int fc_host_remove(struct transport_container *tc, struct device *dev,
466 struct device *cdev)
467 {
468 struct Scsi_Host *shost = dev_to_shost(dev);
469 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
470
471 fc_bsg_remove(fc_host->rqst_q);
472 return 0;
473 }
474
475 static DECLARE_TRANSPORT_CLASS(fc_host_class,
476 "fc_host",
477 fc_host_setup,
478 fc_host_remove,
479 NULL);
480
481 /*
482 * Setup and Remove actions for remote ports are handled
483 * in the service functions below.
484 */
485 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
486 "fc_remote_ports",
487 NULL,
488 NULL,
489 NULL);
490
491 /*
492 * Setup and Remove actions for virtual ports are handled
493 * in the service functions below.
494 */
495 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
496 "fc_vports",
497 NULL,
498 NULL,
499 NULL);
500
501 /*
502 * Netlink Infrastructure
503 */
504
505 static atomic_t fc_event_seq;
506
507 /**
508 * fc_get_event_number - Obtain the next sequential FC event number
509 *
510 * Notes:
511 * We could have inlined this, but it would have required fc_event_seq to
512 * be exposed. For now, live with the subroutine call.
513 * Atomic used to avoid lock/unlock...
514 */
515 u32
516 fc_get_event_number(void)
517 {
518 return atomic_add_return(1, &fc_event_seq);
519 }
520 EXPORT_SYMBOL(fc_get_event_number);
521
522
523 /**
524 * fc_host_post_event - called to post an even on an fc_host.
525 * @shost: host the event occurred on
526 * @event_number: fc event number obtained from get_fc_event_number()
527 * @event_code: fc_host event being posted
528 * @event_data: 32bits of data for the event being posted
529 *
530 * Notes:
531 * This routine assumes no locks are held on entry.
532 */
533 void
534 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
535 enum fc_host_event_code event_code, u32 event_data)
536 {
537 struct sk_buff *skb;
538 struct nlmsghdr *nlh;
539 struct fc_nl_event *event;
540 const char *name;
541 u32 len;
542 int err;
543
544 if (!scsi_nl_sock) {
545 err = -ENOENT;
546 goto send_fail;
547 }
548
549 len = FC_NL_MSGALIGN(sizeof(*event));
550
551 skb = nlmsg_new(len, GFP_KERNEL);
552 if (!skb) {
553 err = -ENOBUFS;
554 goto send_fail;
555 }
556
557 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
558 if (!nlh) {
559 err = -ENOBUFS;
560 goto send_fail_skb;
561 }
562 event = nlmsg_data(nlh);
563
564 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
565 FC_NL_ASYNC_EVENT, len);
566 event->seconds = get_seconds();
567 event->vendor_id = 0;
568 event->host_no = shost->host_no;
569 event->event_datalen = sizeof(u32); /* bytes */
570 event->event_num = event_number;
571 event->event_code = event_code;
572 event->event_data = event_data;
573
574 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
575 GFP_KERNEL);
576 return;
577
578 send_fail_skb:
579 kfree_skb(skb);
580 send_fail:
581 name = get_fc_host_event_code_name(event_code);
582 printk(KERN_WARNING
583 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
584 __func__, shost->host_no,
585 (name) ? name : "<unknown>", event_data, err);
586 return;
587 }
588 EXPORT_SYMBOL(fc_host_post_event);
589
590
591 /**
592 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
593 * @shost: host the event occurred on
594 * @event_number: fc event number obtained from get_fc_event_number()
595 * @data_len: amount, in bytes, of vendor unique data
596 * @data_buf: pointer to vendor unique data
597 * @vendor_id: Vendor id
598 *
599 * Notes:
600 * This routine assumes no locks are held on entry.
601 */
602 void
603 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
604 u32 data_len, char * data_buf, u64 vendor_id)
605 {
606 struct sk_buff *skb;
607 struct nlmsghdr *nlh;
608 struct fc_nl_event *event;
609 u32 len;
610 int err;
611
612 if (!scsi_nl_sock) {
613 err = -ENOENT;
614 goto send_vendor_fail;
615 }
616
617 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
618
619 skb = nlmsg_new(len, GFP_KERNEL);
620 if (!skb) {
621 err = -ENOBUFS;
622 goto send_vendor_fail;
623 }
624
625 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
626 if (!nlh) {
627 err = -ENOBUFS;
628 goto send_vendor_fail_skb;
629 }
630 event = nlmsg_data(nlh);
631
632 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
633 FC_NL_ASYNC_EVENT, len);
634 event->seconds = get_seconds();
635 event->vendor_id = vendor_id;
636 event->host_no = shost->host_no;
637 event->event_datalen = data_len; /* bytes */
638 event->event_num = event_number;
639 event->event_code = FCH_EVT_VENDOR_UNIQUE;
640 memcpy(&event->event_data, data_buf, data_len);
641
642 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
643 GFP_KERNEL);
644 return;
645
646 send_vendor_fail_skb:
647 kfree_skb(skb);
648 send_vendor_fail:
649 printk(KERN_WARNING
650 "%s: Dropped Event : host %d vendor_unique - err %d\n",
651 __func__, shost->host_no, err);
652 return;
653 }
654 EXPORT_SYMBOL(fc_host_post_vendor_event);
655
656
657
658 static __init int fc_transport_init(void)
659 {
660 int error;
661
662 atomic_set(&fc_event_seq, 0);
663
664 error = transport_class_register(&fc_host_class);
665 if (error)
666 return error;
667 error = transport_class_register(&fc_vport_class);
668 if (error)
669 goto unreg_host_class;
670 error = transport_class_register(&fc_rport_class);
671 if (error)
672 goto unreg_vport_class;
673 error = transport_class_register(&fc_transport_class);
674 if (error)
675 goto unreg_rport_class;
676 return 0;
677
678 unreg_rport_class:
679 transport_class_unregister(&fc_rport_class);
680 unreg_vport_class:
681 transport_class_unregister(&fc_vport_class);
682 unreg_host_class:
683 transport_class_unregister(&fc_host_class);
684 return error;
685 }
686
687 static void __exit fc_transport_exit(void)
688 {
689 transport_class_unregister(&fc_transport_class);
690 transport_class_unregister(&fc_rport_class);
691 transport_class_unregister(&fc_host_class);
692 transport_class_unregister(&fc_vport_class);
693 }
694
695 /*
696 * FC Remote Port Attribute Management
697 */
698
699 #define fc_rport_show_function(field, format_string, sz, cast) \
700 static ssize_t \
701 show_fc_rport_##field (struct device *dev, \
702 struct device_attribute *attr, char *buf) \
703 { \
704 struct fc_rport *rport = transport_class_to_rport(dev); \
705 struct Scsi_Host *shost = rport_to_shost(rport); \
706 struct fc_internal *i = to_fc_internal(shost->transportt); \
707 if ((i->f->get_rport_##field) && \
708 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
709 (rport->port_state == FC_PORTSTATE_DELETED) || \
710 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
711 i->f->get_rport_##field(rport); \
712 return snprintf(buf, sz, format_string, cast rport->field); \
713 }
714
715 #define fc_rport_store_function(field) \
716 static ssize_t \
717 store_fc_rport_##field(struct device *dev, \
718 struct device_attribute *attr, \
719 const char *buf, size_t count) \
720 { \
721 int val; \
722 struct fc_rport *rport = transport_class_to_rport(dev); \
723 struct Scsi_Host *shost = rport_to_shost(rport); \
724 struct fc_internal *i = to_fc_internal(shost->transportt); \
725 char *cp; \
726 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
727 (rport->port_state == FC_PORTSTATE_DELETED) || \
728 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
729 return -EBUSY; \
730 val = simple_strtoul(buf, &cp, 0); \
731 if (*cp && (*cp != '\n')) \
732 return -EINVAL; \
733 i->f->set_rport_##field(rport, val); \
734 return count; \
735 }
736
737 #define fc_rport_rd_attr(field, format_string, sz) \
738 fc_rport_show_function(field, format_string, sz, ) \
739 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
740 show_fc_rport_##field, NULL)
741
742 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
743 fc_rport_show_function(field, format_string, sz, (cast)) \
744 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
745 show_fc_rport_##field, NULL)
746
747 #define fc_rport_rw_attr(field, format_string, sz) \
748 fc_rport_show_function(field, format_string, sz, ) \
749 fc_rport_store_function(field) \
750 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
751 show_fc_rport_##field, \
752 store_fc_rport_##field)
753
754
755 #define fc_private_rport_show_function(field, format_string, sz, cast) \
756 static ssize_t \
757 show_fc_rport_##field (struct device *dev, \
758 struct device_attribute *attr, char *buf) \
759 { \
760 struct fc_rport *rport = transport_class_to_rport(dev); \
761 return snprintf(buf, sz, format_string, cast rport->field); \
762 }
763
764 #define fc_private_rport_rd_attr(field, format_string, sz) \
765 fc_private_rport_show_function(field, format_string, sz, ) \
766 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
767 show_fc_rport_##field, NULL)
768
769 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
770 fc_private_rport_show_function(field, format_string, sz, (cast)) \
771 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
772 show_fc_rport_##field, NULL)
773
774
775 #define fc_private_rport_rd_enum_attr(title, maxlen) \
776 static ssize_t \
777 show_fc_rport_##title (struct device *dev, \
778 struct device_attribute *attr, char *buf) \
779 { \
780 struct fc_rport *rport = transport_class_to_rport(dev); \
781 const char *name; \
782 name = get_fc_##title##_name(rport->title); \
783 if (!name) \
784 return -EINVAL; \
785 return snprintf(buf, maxlen, "%s\n", name); \
786 } \
787 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
788 show_fc_rport_##title, NULL)
789
790
791 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
792 i->private_rport_attrs[count] = device_attr_rport_##field; \
793 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
794 i->private_rport_attrs[count].store = NULL; \
795 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
796 if (i->f->show_rport_##field) \
797 count++
798
799 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
800 i->private_rport_attrs[count] = device_attr_rport_##field; \
801 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
802 i->private_rport_attrs[count].store = NULL; \
803 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
804 count++
805
806 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
807 i->private_rport_attrs[count] = device_attr_rport_##field; \
808 if (!i->f->set_rport_##field) { \
809 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
810 i->private_rport_attrs[count].store = NULL; \
811 } \
812 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
813 if (i->f->show_rport_##field) \
814 count++
815
816 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
817 { \
818 i->private_rport_attrs[count] = device_attr_rport_##field; \
819 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
820 count++; \
821 }
822
823
824 /* The FC Transport Remote Port Attributes: */
825
826 /* Fixed Remote Port Attributes */
827
828 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
829
830 static ssize_t
831 show_fc_rport_supported_classes (struct device *dev,
832 struct device_attribute *attr, char *buf)
833 {
834 struct fc_rport *rport = transport_class_to_rport(dev);
835 if (rport->supported_classes == FC_COS_UNSPECIFIED)
836 return snprintf(buf, 20, "unspecified\n");
837 return get_fc_cos_names(rport->supported_classes, buf);
838 }
839 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
840 show_fc_rport_supported_classes, NULL);
841
842 /* Dynamic Remote Port Attributes */
843
844 /*
845 * dev_loss_tmo attribute
846 */
847 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
848 {
849 char *cp;
850
851 *val = simple_strtoul(buf, &cp, 0);
852 if ((*cp && (*cp != '\n')) || (*val < 0))
853 return -EINVAL;
854 /*
855 * Check for overflow; dev_loss_tmo is u32
856 */
857 if (*val > UINT_MAX)
858 return -EINVAL;
859
860 return 0;
861 }
862
863 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
864 unsigned long val)
865 {
866 struct Scsi_Host *shost = rport_to_shost(rport);
867 struct fc_internal *i = to_fc_internal(shost->transportt);
868
869 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
870 (rport->port_state == FC_PORTSTATE_DELETED) ||
871 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
872 return -EBUSY;
873 /*
874 * Check for overflow; dev_loss_tmo is u32
875 */
876 if (val > UINT_MAX)
877 return -EINVAL;
878
879 /*
880 * If fast_io_fail is off we have to cap
881 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
882 */
883 if (rport->fast_io_fail_tmo == -1 &&
884 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
885 return -EINVAL;
886
887 i->f->set_rport_dev_loss_tmo(rport, val);
888 return 0;
889 }
890
891 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
892 static ssize_t
893 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
894 const char *buf, size_t count)
895 {
896 struct fc_rport *rport = transport_class_to_rport(dev);
897 unsigned long val;
898 int rc;
899
900 rc = fc_str_to_dev_loss(buf, &val);
901 if (rc)
902 return rc;
903
904 rc = fc_rport_set_dev_loss_tmo(rport, val);
905 if (rc)
906 return rc;
907 return count;
908 }
909 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
910 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
911
912
913 /* Private Remote Port Attributes */
914
915 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
916 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
917 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
918
919 static ssize_t
920 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
921 char *buf)
922 {
923 struct fc_rport *rport = transport_class_to_rport(dev);
924
925 /* identify any roles that are port_id specific */
926 if ((rport->port_id != -1) &&
927 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
928 FC_WELLKNOWN_PORTID_MASK) {
929 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
930 case FC_FPORT_PORTID:
931 return snprintf(buf, 30, "Fabric Port\n");
932 case FC_FABCTLR_PORTID:
933 return snprintf(buf, 30, "Fabric Controller\n");
934 case FC_DIRSRVR_PORTID:
935 return snprintf(buf, 30, "Directory Server\n");
936 case FC_TIMESRVR_PORTID:
937 return snprintf(buf, 30, "Time Server\n");
938 case FC_MGMTSRVR_PORTID:
939 return snprintf(buf, 30, "Management Server\n");
940 default:
941 return snprintf(buf, 30, "Unknown Fabric Entity\n");
942 }
943 } else {
944 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
945 return snprintf(buf, 20, "unknown\n");
946 return get_fc_port_roles_names(rport->roles, buf);
947 }
948 }
949 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
950 show_fc_rport_roles, NULL);
951
952 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
953 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
954
955 /*
956 * fast_io_fail_tmo attribute
957 */
958 static ssize_t
959 show_fc_rport_fast_io_fail_tmo (struct device *dev,
960 struct device_attribute *attr, char *buf)
961 {
962 struct fc_rport *rport = transport_class_to_rport(dev);
963
964 if (rport->fast_io_fail_tmo == -1)
965 return snprintf(buf, 5, "off\n");
966 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
967 }
968
969 static ssize_t
970 store_fc_rport_fast_io_fail_tmo(struct device *dev,
971 struct device_attribute *attr, const char *buf,
972 size_t count)
973 {
974 int val;
975 char *cp;
976 struct fc_rport *rport = transport_class_to_rport(dev);
977
978 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
979 (rport->port_state == FC_PORTSTATE_DELETED) ||
980 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
981 return -EBUSY;
982 if (strncmp(buf, "off", 3) == 0)
983 rport->fast_io_fail_tmo = -1;
984 else {
985 val = simple_strtoul(buf, &cp, 0);
986 if ((*cp && (*cp != '\n')) || (val < 0))
987 return -EINVAL;
988 /*
989 * Cap fast_io_fail by dev_loss_tmo or
990 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
991 */
992 if ((val >= rport->dev_loss_tmo) ||
993 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
994 return -EINVAL;
995
996 rport->fast_io_fail_tmo = val;
997 }
998 return count;
999 }
1000 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1001 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1002
1003
1004 /*
1005 * FC SCSI Target Attribute Management
1006 */
1007
1008 /*
1009 * Note: in the target show function we recognize when the remote
1010 * port is in the hierarchy and do not allow the driver to get
1011 * involved in sysfs functions. The driver only gets involved if
1012 * it's the "old" style that doesn't use rports.
1013 */
1014 #define fc_starget_show_function(field, format_string, sz, cast) \
1015 static ssize_t \
1016 show_fc_starget_##field (struct device *dev, \
1017 struct device_attribute *attr, char *buf) \
1018 { \
1019 struct scsi_target *starget = transport_class_to_starget(dev); \
1020 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1021 struct fc_internal *i = to_fc_internal(shost->transportt); \
1022 struct fc_rport *rport = starget_to_rport(starget); \
1023 if (rport) \
1024 fc_starget_##field(starget) = rport->field; \
1025 else if (i->f->get_starget_##field) \
1026 i->f->get_starget_##field(starget); \
1027 return snprintf(buf, sz, format_string, \
1028 cast fc_starget_##field(starget)); \
1029 }
1030
1031 #define fc_starget_rd_attr(field, format_string, sz) \
1032 fc_starget_show_function(field, format_string, sz, ) \
1033 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1034 show_fc_starget_##field, NULL)
1035
1036 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1037 fc_starget_show_function(field, format_string, sz, (cast)) \
1038 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1039 show_fc_starget_##field, NULL)
1040
1041 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1042 i->private_starget_attrs[count] = device_attr_starget_##field; \
1043 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1044 i->private_starget_attrs[count].store = NULL; \
1045 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1046 if (i->f->show_starget_##field) \
1047 count++
1048
1049 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1050 i->private_starget_attrs[count] = device_attr_starget_##field; \
1051 if (!i->f->set_starget_##field) { \
1052 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1053 i->private_starget_attrs[count].store = NULL; \
1054 } \
1055 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1056 if (i->f->show_starget_##field) \
1057 count++
1058
1059 /* The FC Transport SCSI Target Attributes: */
1060 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1061 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1062 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1063
1064
1065 /*
1066 * FC Virtual Port Attribute Management
1067 */
1068
1069 #define fc_vport_show_function(field, format_string, sz, cast) \
1070 static ssize_t \
1071 show_fc_vport_##field (struct device *dev, \
1072 struct device_attribute *attr, char *buf) \
1073 { \
1074 struct fc_vport *vport = transport_class_to_vport(dev); \
1075 struct Scsi_Host *shost = vport_to_shost(vport); \
1076 struct fc_internal *i = to_fc_internal(shost->transportt); \
1077 if ((i->f->get_vport_##field) && \
1078 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1079 i->f->get_vport_##field(vport); \
1080 return snprintf(buf, sz, format_string, cast vport->field); \
1081 }
1082
1083 #define fc_vport_store_function(field) \
1084 static ssize_t \
1085 store_fc_vport_##field(struct device *dev, \
1086 struct device_attribute *attr, \
1087 const char *buf, size_t count) \
1088 { \
1089 int val; \
1090 struct fc_vport *vport = transport_class_to_vport(dev); \
1091 struct Scsi_Host *shost = vport_to_shost(vport); \
1092 struct fc_internal *i = to_fc_internal(shost->transportt); \
1093 char *cp; \
1094 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1095 return -EBUSY; \
1096 val = simple_strtoul(buf, &cp, 0); \
1097 if (*cp && (*cp != '\n')) \
1098 return -EINVAL; \
1099 i->f->set_vport_##field(vport, val); \
1100 return count; \
1101 }
1102
1103 #define fc_vport_store_str_function(field, slen) \
1104 static ssize_t \
1105 store_fc_vport_##field(struct device *dev, \
1106 struct device_attribute *attr, \
1107 const char *buf, size_t count) \
1108 { \
1109 struct fc_vport *vport = transport_class_to_vport(dev); \
1110 struct Scsi_Host *shost = vport_to_shost(vport); \
1111 struct fc_internal *i = to_fc_internal(shost->transportt); \
1112 unsigned int cnt=count; \
1113 \
1114 /* count may include a LF at end of string */ \
1115 if (buf[cnt-1] == '\n') \
1116 cnt--; \
1117 if (cnt > ((slen) - 1)) \
1118 return -EINVAL; \
1119 memcpy(vport->field, buf, cnt); \
1120 i->f->set_vport_##field(vport); \
1121 return count; \
1122 }
1123
1124 #define fc_vport_rd_attr(field, format_string, sz) \
1125 fc_vport_show_function(field, format_string, sz, ) \
1126 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1127 show_fc_vport_##field, NULL)
1128
1129 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1130 fc_vport_show_function(field, format_string, sz, (cast)) \
1131 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1132 show_fc_vport_##field, NULL)
1133
1134 #define fc_vport_rw_attr(field, format_string, sz) \
1135 fc_vport_show_function(field, format_string, sz, ) \
1136 fc_vport_store_function(field) \
1137 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1138 show_fc_vport_##field, \
1139 store_fc_vport_##field)
1140
1141 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1142 static ssize_t \
1143 show_fc_vport_##field (struct device *dev, \
1144 struct device_attribute *attr, char *buf) \
1145 { \
1146 struct fc_vport *vport = transport_class_to_vport(dev); \
1147 return snprintf(buf, sz, format_string, cast vport->field); \
1148 }
1149
1150 #define fc_private_vport_store_u32_function(field) \
1151 static ssize_t \
1152 store_fc_vport_##field(struct device *dev, \
1153 struct device_attribute *attr, \
1154 const char *buf, size_t count) \
1155 { \
1156 u32 val; \
1157 struct fc_vport *vport = transport_class_to_vport(dev); \
1158 char *cp; \
1159 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1160 return -EBUSY; \
1161 val = simple_strtoul(buf, &cp, 0); \
1162 if (*cp && (*cp != '\n')) \
1163 return -EINVAL; \
1164 vport->field = val; \
1165 return count; \
1166 }
1167
1168
1169 #define fc_private_vport_rd_attr(field, format_string, sz) \
1170 fc_private_vport_show_function(field, format_string, sz, ) \
1171 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1172 show_fc_vport_##field, NULL)
1173
1174 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1175 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1176 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1177 show_fc_vport_##field, NULL)
1178
1179 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1180 fc_private_vport_show_function(field, format_string, sz, ) \
1181 fc_private_vport_store_u32_function(field) \
1182 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1183 show_fc_vport_##field, \
1184 store_fc_vport_##field)
1185
1186
1187 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1188 static ssize_t \
1189 show_fc_vport_##title (struct device *dev, \
1190 struct device_attribute *attr, \
1191 char *buf) \
1192 { \
1193 struct fc_vport *vport = transport_class_to_vport(dev); \
1194 const char *name; \
1195 name = get_fc_##title##_name(vport->title); \
1196 if (!name) \
1197 return -EINVAL; \
1198 return snprintf(buf, maxlen, "%s\n", name); \
1199 } \
1200 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1201 show_fc_vport_##title, NULL)
1202
1203
1204 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1205 i->private_vport_attrs[count] = device_attr_vport_##field; \
1206 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1207 i->private_vport_attrs[count].store = NULL; \
1208 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1209 if (i->f->get_##field) \
1210 count++
1211 /* NOTE: Above MACRO differs: checks function not show bit */
1212
1213 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1214 i->private_vport_attrs[count] = device_attr_vport_##field; \
1215 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1216 i->private_vport_attrs[count].store = NULL; \
1217 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1218 count++
1219
1220 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1221 i->private_vport_attrs[count] = device_attr_vport_##field; \
1222 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1223 if (i->f->field) \
1224 count++
1225 /* NOTE: Above MACRO differs: checks function */
1226
1227 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1228 i->private_vport_attrs[count] = device_attr_vport_##field; \
1229 if (!i->f->set_vport_##field) { \
1230 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1231 i->private_vport_attrs[count].store = NULL; \
1232 } \
1233 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1234 count++
1235 /* NOTE: Above MACRO differs: does not check show bit */
1236
1237 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1238 { \
1239 i->private_vport_attrs[count] = device_attr_vport_##field; \
1240 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1241 count++; \
1242 }
1243
1244
1245 /* The FC Transport Virtual Port Attributes: */
1246
1247 /* Fixed Virtual Port Attributes */
1248
1249 /* Dynamic Virtual Port Attributes */
1250
1251 /* Private Virtual Port Attributes */
1252
1253 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1254 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1255 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1256 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1257
1258 static ssize_t
1259 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1260 char *buf)
1261 {
1262 struct fc_vport *vport = transport_class_to_vport(dev);
1263
1264 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1265 return snprintf(buf, 20, "unknown\n");
1266 return get_fc_port_roles_names(vport->roles, buf);
1267 }
1268 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1269
1270 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1271
1272 fc_private_vport_show_function(symbolic_name, "%s\n",
1273 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1274 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1275 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1276 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1277
1278 static ssize_t
1279 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1280 const char *buf, size_t count)
1281 {
1282 struct fc_vport *vport = transport_class_to_vport(dev);
1283 struct Scsi_Host *shost = vport_to_shost(vport);
1284 unsigned long flags;
1285
1286 spin_lock_irqsave(shost->host_lock, flags);
1287 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1288 spin_unlock_irqrestore(shost->host_lock, flags);
1289 return -EBUSY;
1290 }
1291 vport->flags |= FC_VPORT_DELETING;
1292 spin_unlock_irqrestore(shost->host_lock, flags);
1293
1294 fc_queue_work(shost, &vport->vport_delete_work);
1295 return count;
1296 }
1297 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1298 NULL, store_fc_vport_delete);
1299
1300
1301 /*
1302 * Enable/Disable vport
1303 * Write "1" to disable, write "0" to enable
1304 */
1305 static ssize_t
1306 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1307 const char *buf,
1308 size_t count)
1309 {
1310 struct fc_vport *vport = transport_class_to_vport(dev);
1311 struct Scsi_Host *shost = vport_to_shost(vport);
1312 struct fc_internal *i = to_fc_internal(shost->transportt);
1313 int stat;
1314
1315 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1316 return -EBUSY;
1317
1318 if (*buf == '0') {
1319 if (vport->vport_state != FC_VPORT_DISABLED)
1320 return -EALREADY;
1321 } else if (*buf == '1') {
1322 if (vport->vport_state == FC_VPORT_DISABLED)
1323 return -EALREADY;
1324 } else
1325 return -EINVAL;
1326
1327 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1328 return stat ? stat : count;
1329 }
1330 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1331 NULL, store_fc_vport_disable);
1332
1333
1334 /*
1335 * Host Attribute Management
1336 */
1337
1338 #define fc_host_show_function(field, format_string, sz, cast) \
1339 static ssize_t \
1340 show_fc_host_##field (struct device *dev, \
1341 struct device_attribute *attr, char *buf) \
1342 { \
1343 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1344 struct fc_internal *i = to_fc_internal(shost->transportt); \
1345 if (i->f->get_host_##field) \
1346 i->f->get_host_##field(shost); \
1347 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1348 }
1349
1350 #define fc_host_store_function(field) \
1351 static ssize_t \
1352 store_fc_host_##field(struct device *dev, \
1353 struct device_attribute *attr, \
1354 const char *buf, size_t count) \
1355 { \
1356 int val; \
1357 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1358 struct fc_internal *i = to_fc_internal(shost->transportt); \
1359 char *cp; \
1360 \
1361 val = simple_strtoul(buf, &cp, 0); \
1362 if (*cp && (*cp != '\n')) \
1363 return -EINVAL; \
1364 i->f->set_host_##field(shost, val); \
1365 return count; \
1366 }
1367
1368 #define fc_host_store_str_function(field, slen) \
1369 static ssize_t \
1370 store_fc_host_##field(struct device *dev, \
1371 struct device_attribute *attr, \
1372 const char *buf, size_t count) \
1373 { \
1374 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1375 struct fc_internal *i = to_fc_internal(shost->transportt); \
1376 unsigned int cnt=count; \
1377 \
1378 /* count may include a LF at end of string */ \
1379 if (buf[cnt-1] == '\n') \
1380 cnt--; \
1381 if (cnt > ((slen) - 1)) \
1382 return -EINVAL; \
1383 memcpy(fc_host_##field(shost), buf, cnt); \
1384 i->f->set_host_##field(shost); \
1385 return count; \
1386 }
1387
1388 #define fc_host_rd_attr(field, format_string, sz) \
1389 fc_host_show_function(field, format_string, sz, ) \
1390 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1391 show_fc_host_##field, NULL)
1392
1393 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1394 fc_host_show_function(field, format_string, sz, (cast)) \
1395 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1396 show_fc_host_##field, NULL)
1397
1398 #define fc_host_rw_attr(field, format_string, sz) \
1399 fc_host_show_function(field, format_string, sz, ) \
1400 fc_host_store_function(field) \
1401 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1402 show_fc_host_##field, \
1403 store_fc_host_##field)
1404
1405 #define fc_host_rd_enum_attr(title, maxlen) \
1406 static ssize_t \
1407 show_fc_host_##title (struct device *dev, \
1408 struct device_attribute *attr, char *buf) \
1409 { \
1410 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1411 struct fc_internal *i = to_fc_internal(shost->transportt); \
1412 const char *name; \
1413 if (i->f->get_host_##title) \
1414 i->f->get_host_##title(shost); \
1415 name = get_fc_##title##_name(fc_host_##title(shost)); \
1416 if (!name) \
1417 return -EINVAL; \
1418 return snprintf(buf, maxlen, "%s\n", name); \
1419 } \
1420 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1421
1422 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1423 i->private_host_attrs[count] = device_attr_host_##field; \
1424 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1425 i->private_host_attrs[count].store = NULL; \
1426 i->host_attrs[count] = &i->private_host_attrs[count]; \
1427 if (i->f->show_host_##field) \
1428 count++
1429
1430 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1431 i->private_host_attrs[count] = device_attr_host_##field; \
1432 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1433 i->private_host_attrs[count].store = NULL; \
1434 i->host_attrs[count] = &i->private_host_attrs[count]; \
1435 count++
1436
1437 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1438 i->private_host_attrs[count] = device_attr_host_##field; \
1439 if (!i->f->set_host_##field) { \
1440 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1441 i->private_host_attrs[count].store = NULL; \
1442 } \
1443 i->host_attrs[count] = &i->private_host_attrs[count]; \
1444 if (i->f->show_host_##field) \
1445 count++
1446
1447
1448 #define fc_private_host_show_function(field, format_string, sz, cast) \
1449 static ssize_t \
1450 show_fc_host_##field (struct device *dev, \
1451 struct device_attribute *attr, char *buf) \
1452 { \
1453 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1454 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1455 }
1456
1457 #define fc_private_host_rd_attr(field, format_string, sz) \
1458 fc_private_host_show_function(field, format_string, sz, ) \
1459 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1460 show_fc_host_##field, NULL)
1461
1462 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1463 fc_private_host_show_function(field, format_string, sz, (cast)) \
1464 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1465 show_fc_host_##field, NULL)
1466
1467 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1468 i->private_host_attrs[count] = device_attr_host_##field; \
1469 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1470 i->private_host_attrs[count].store = NULL; \
1471 i->host_attrs[count] = &i->private_host_attrs[count]; \
1472 count++
1473
1474 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1475 { \
1476 i->private_host_attrs[count] = device_attr_host_##field; \
1477 i->host_attrs[count] = &i->private_host_attrs[count]; \
1478 count++; \
1479 }
1480
1481
1482 /* Fixed Host Attributes */
1483
1484 static ssize_t
1485 show_fc_host_supported_classes (struct device *dev,
1486 struct device_attribute *attr, char *buf)
1487 {
1488 struct Scsi_Host *shost = transport_class_to_shost(dev);
1489
1490 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1491 return snprintf(buf, 20, "unspecified\n");
1492
1493 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1494 }
1495 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1496 show_fc_host_supported_classes, NULL);
1497
1498 static ssize_t
1499 show_fc_host_supported_fc4s (struct device *dev,
1500 struct device_attribute *attr, char *buf)
1501 {
1502 struct Scsi_Host *shost = transport_class_to_shost(dev);
1503 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1504 }
1505 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1506 show_fc_host_supported_fc4s, NULL);
1507
1508 static ssize_t
1509 show_fc_host_supported_speeds (struct device *dev,
1510 struct device_attribute *attr, char *buf)
1511 {
1512 struct Scsi_Host *shost = transport_class_to_shost(dev);
1513
1514 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1515 return snprintf(buf, 20, "unknown\n");
1516
1517 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1518 }
1519 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1520 show_fc_host_supported_speeds, NULL);
1521
1522
1523 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1524 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1525 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1526 unsigned long long);
1527 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1528 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1529 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1530 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1531 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1532 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1533 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1534 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1535 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1536 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1537
1538
1539 /* Dynamic Host Attributes */
1540
1541 static ssize_t
1542 show_fc_host_active_fc4s (struct device *dev,
1543 struct device_attribute *attr, char *buf)
1544 {
1545 struct Scsi_Host *shost = transport_class_to_shost(dev);
1546 struct fc_internal *i = to_fc_internal(shost->transportt);
1547
1548 if (i->f->get_host_active_fc4s)
1549 i->f->get_host_active_fc4s(shost);
1550
1551 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1552 }
1553 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1554 show_fc_host_active_fc4s, NULL);
1555
1556 static ssize_t
1557 show_fc_host_speed (struct device *dev,
1558 struct device_attribute *attr, char *buf)
1559 {
1560 struct Scsi_Host *shost = transport_class_to_shost(dev);
1561 struct fc_internal *i = to_fc_internal(shost->transportt);
1562
1563 if (i->f->get_host_speed)
1564 i->f->get_host_speed(shost);
1565
1566 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1567 return snprintf(buf, 20, "unknown\n");
1568
1569 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1570 }
1571 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1572 show_fc_host_speed, NULL);
1573
1574
1575 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1576 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1577 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1578 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1579 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1580
1581 fc_private_host_show_function(system_hostname, "%s\n",
1582 FC_SYMBOLIC_NAME_SIZE + 1, )
1583 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1584 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1585 show_fc_host_system_hostname, store_fc_host_system_hostname);
1586
1587
1588 /* Private Host Attributes */
1589
1590 static ssize_t
1591 show_fc_private_host_tgtid_bind_type(struct device *dev,
1592 struct device_attribute *attr, char *buf)
1593 {
1594 struct Scsi_Host *shost = transport_class_to_shost(dev);
1595 const char *name;
1596
1597 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1598 if (!name)
1599 return -EINVAL;
1600 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1601 }
1602
1603 #define get_list_head_entry(pos, head, member) \
1604 pos = list_entry((head)->next, typeof(*pos), member)
1605
1606 static ssize_t
1607 store_fc_private_host_tgtid_bind_type(struct device *dev,
1608 struct device_attribute *attr, const char *buf, size_t count)
1609 {
1610 struct Scsi_Host *shost = transport_class_to_shost(dev);
1611 struct fc_rport *rport;
1612 enum fc_tgtid_binding_type val;
1613 unsigned long flags;
1614
1615 if (get_fc_tgtid_bind_type_match(buf, &val))
1616 return -EINVAL;
1617
1618 /* if changing bind type, purge all unused consistent bindings */
1619 if (val != fc_host_tgtid_bind_type(shost)) {
1620 spin_lock_irqsave(shost->host_lock, flags);
1621 while (!list_empty(&fc_host_rport_bindings(shost))) {
1622 get_list_head_entry(rport,
1623 &fc_host_rport_bindings(shost), peers);
1624 list_del(&rport->peers);
1625 rport->port_state = FC_PORTSTATE_DELETED;
1626 fc_queue_work(shost, &rport->rport_delete_work);
1627 }
1628 spin_unlock_irqrestore(shost->host_lock, flags);
1629 }
1630
1631 fc_host_tgtid_bind_type(shost) = val;
1632 return count;
1633 }
1634
1635 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1636 show_fc_private_host_tgtid_bind_type,
1637 store_fc_private_host_tgtid_bind_type);
1638
1639 static ssize_t
1640 store_fc_private_host_issue_lip(struct device *dev,
1641 struct device_attribute *attr, const char *buf, size_t count)
1642 {
1643 struct Scsi_Host *shost = transport_class_to_shost(dev);
1644 struct fc_internal *i = to_fc_internal(shost->transportt);
1645 int ret;
1646
1647 /* ignore any data value written to the attribute */
1648 if (i->f->issue_fc_host_lip) {
1649 ret = i->f->issue_fc_host_lip(shost);
1650 return ret ? ret: count;
1651 }
1652
1653 return -ENOENT;
1654 }
1655
1656 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1657 store_fc_private_host_issue_lip);
1658
1659 static ssize_t
1660 store_fc_private_host_dev_loss_tmo(struct device *dev,
1661 struct device_attribute *attr,
1662 const char *buf, size_t count)
1663 {
1664 struct Scsi_Host *shost = transport_class_to_shost(dev);
1665 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1666 struct fc_rport *rport;
1667 unsigned long val, flags;
1668 int rc;
1669
1670 rc = fc_str_to_dev_loss(buf, &val);
1671 if (rc)
1672 return rc;
1673
1674 fc_host_dev_loss_tmo(shost) = val;
1675 spin_lock_irqsave(shost->host_lock, flags);
1676 list_for_each_entry(rport, &fc_host->rports, peers)
1677 fc_rport_set_dev_loss_tmo(rport, val);
1678 spin_unlock_irqrestore(shost->host_lock, flags);
1679 return count;
1680 }
1681
1682 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1683 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1684 show_fc_host_dev_loss_tmo,
1685 store_fc_private_host_dev_loss_tmo);
1686
1687 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1688
1689 /*
1690 * Host Statistics Management
1691 */
1692
1693 /* Show a given an attribute in the statistics group */
1694 static ssize_t
1695 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1696 {
1697 struct Scsi_Host *shost = transport_class_to_shost(dev);
1698 struct fc_internal *i = to_fc_internal(shost->transportt);
1699 struct fc_host_statistics *stats;
1700 ssize_t ret = -ENOENT;
1701
1702 if (offset > sizeof(struct fc_host_statistics) ||
1703 offset % sizeof(u64) != 0)
1704 WARN_ON(1);
1705
1706 if (i->f->get_fc_host_stats) {
1707 stats = (i->f->get_fc_host_stats)(shost);
1708 if (stats)
1709 ret = snprintf(buf, 20, "0x%llx\n",
1710 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1711 }
1712 return ret;
1713 }
1714
1715
1716 /* generate a read-only statistics attribute */
1717 #define fc_host_statistic(name) \
1718 static ssize_t show_fcstat_##name(struct device *cd, \
1719 struct device_attribute *attr, \
1720 char *buf) \
1721 { \
1722 return fc_stat_show(cd, buf, \
1723 offsetof(struct fc_host_statistics, name)); \
1724 } \
1725 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1726
1727 fc_host_statistic(seconds_since_last_reset);
1728 fc_host_statistic(tx_frames);
1729 fc_host_statistic(tx_words);
1730 fc_host_statistic(rx_frames);
1731 fc_host_statistic(rx_words);
1732 fc_host_statistic(lip_count);
1733 fc_host_statistic(nos_count);
1734 fc_host_statistic(error_frames);
1735 fc_host_statistic(dumped_frames);
1736 fc_host_statistic(link_failure_count);
1737 fc_host_statistic(loss_of_sync_count);
1738 fc_host_statistic(loss_of_signal_count);
1739 fc_host_statistic(prim_seq_protocol_err_count);
1740 fc_host_statistic(invalid_tx_word_count);
1741 fc_host_statistic(invalid_crc_count);
1742 fc_host_statistic(fcp_input_requests);
1743 fc_host_statistic(fcp_output_requests);
1744 fc_host_statistic(fcp_control_requests);
1745 fc_host_statistic(fcp_input_megabytes);
1746 fc_host_statistic(fcp_output_megabytes);
1747 fc_host_statistic(fcp_packet_alloc_failures);
1748 fc_host_statistic(fcp_packet_aborts);
1749 fc_host_statistic(fcp_frame_alloc_failures);
1750 fc_host_statistic(fc_no_free_exch);
1751 fc_host_statistic(fc_no_free_exch_xid);
1752 fc_host_statistic(fc_xid_not_found);
1753 fc_host_statistic(fc_xid_busy);
1754 fc_host_statistic(fc_seq_not_found);
1755 fc_host_statistic(fc_non_bls_resp);
1756
1757 static ssize_t
1758 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1759 const char *buf, size_t count)
1760 {
1761 struct Scsi_Host *shost = transport_class_to_shost(dev);
1762 struct fc_internal *i = to_fc_internal(shost->transportt);
1763
1764 /* ignore any data value written to the attribute */
1765 if (i->f->reset_fc_host_stats) {
1766 i->f->reset_fc_host_stats(shost);
1767 return count;
1768 }
1769
1770 return -ENOENT;
1771 }
1772 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1773 fc_reset_statistics);
1774
1775 static struct attribute *fc_statistics_attrs[] = {
1776 &device_attr_host_seconds_since_last_reset.attr,
1777 &device_attr_host_tx_frames.attr,
1778 &device_attr_host_tx_words.attr,
1779 &device_attr_host_rx_frames.attr,
1780 &device_attr_host_rx_words.attr,
1781 &device_attr_host_lip_count.attr,
1782 &device_attr_host_nos_count.attr,
1783 &device_attr_host_error_frames.attr,
1784 &device_attr_host_dumped_frames.attr,
1785 &device_attr_host_link_failure_count.attr,
1786 &device_attr_host_loss_of_sync_count.attr,
1787 &device_attr_host_loss_of_signal_count.attr,
1788 &device_attr_host_prim_seq_protocol_err_count.attr,
1789 &device_attr_host_invalid_tx_word_count.attr,
1790 &device_attr_host_invalid_crc_count.attr,
1791 &device_attr_host_fcp_input_requests.attr,
1792 &device_attr_host_fcp_output_requests.attr,
1793 &device_attr_host_fcp_control_requests.attr,
1794 &device_attr_host_fcp_input_megabytes.attr,
1795 &device_attr_host_fcp_output_megabytes.attr,
1796 &device_attr_host_fcp_packet_alloc_failures.attr,
1797 &device_attr_host_fcp_packet_aborts.attr,
1798 &device_attr_host_fcp_frame_alloc_failures.attr,
1799 &device_attr_host_fc_no_free_exch.attr,
1800 &device_attr_host_fc_no_free_exch_xid.attr,
1801 &device_attr_host_fc_xid_not_found.attr,
1802 &device_attr_host_fc_xid_busy.attr,
1803 &device_attr_host_fc_seq_not_found.attr,
1804 &device_attr_host_fc_non_bls_resp.attr,
1805 &device_attr_host_reset_statistics.attr,
1806 NULL
1807 };
1808
1809 static struct attribute_group fc_statistics_group = {
1810 .name = "statistics",
1811 .attrs = fc_statistics_attrs,
1812 };
1813
1814
1815 /* Host Vport Attributes */
1816
1817 static int
1818 fc_parse_wwn(const char *ns, u64 *nm)
1819 {
1820 unsigned int i, j;
1821 u8 wwn[8];
1822
1823 memset(wwn, 0, sizeof(wwn));
1824
1825 /* Validate and store the new name */
1826 for (i=0, j=0; i < 16; i++) {
1827 int value;
1828
1829 value = hex_to_bin(*ns++);
1830 if (value >= 0)
1831 j = (j << 4) | value;
1832 else
1833 return -EINVAL;
1834 if (i % 2) {
1835 wwn[i/2] = j & 0xff;
1836 j = 0;
1837 }
1838 }
1839
1840 *nm = wwn_to_u64(wwn);
1841
1842 return 0;
1843 }
1844
1845
1846 /*
1847 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1848 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1849 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1850 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1851 */
1852 static ssize_t
1853 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1854 const char *buf, size_t count)
1855 {
1856 struct Scsi_Host *shost = transport_class_to_shost(dev);
1857 struct fc_vport_identifiers vid;
1858 struct fc_vport *vport;
1859 unsigned int cnt=count;
1860 int stat;
1861
1862 memset(&vid, 0, sizeof(vid));
1863
1864 /* count may include a LF at end of string */
1865 if (buf[cnt-1] == '\n')
1866 cnt--;
1867
1868 /* validate we have enough characters for WWPN */
1869 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1870 return -EINVAL;
1871
1872 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1873 if (stat)
1874 return stat;
1875
1876 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1877 if (stat)
1878 return stat;
1879
1880 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1881 vid.vport_type = FC_PORTTYPE_NPIV;
1882 /* vid.symbolic_name is already zero/NULL's */
1883 vid.disable = false; /* always enabled */
1884
1885 /* we only allow support on Channel 0 !!! */
1886 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1887 return stat ? stat : count;
1888 }
1889 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1890 store_fc_host_vport_create);
1891
1892
1893 /*
1894 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1895 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1896 * The WWNs are specified as hex characters, and may *not* contain
1897 * any prefixes (e.g. 0x, x, etc)
1898 */
1899 static ssize_t
1900 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1901 const char *buf, size_t count)
1902 {
1903 struct Scsi_Host *shost = transport_class_to_shost(dev);
1904 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1905 struct fc_vport *vport;
1906 u64 wwpn, wwnn;
1907 unsigned long flags;
1908 unsigned int cnt=count;
1909 int stat, match;
1910
1911 /* count may include a LF at end of string */
1912 if (buf[cnt-1] == '\n')
1913 cnt--;
1914
1915 /* validate we have enough characters for WWPN */
1916 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1917 return -EINVAL;
1918
1919 stat = fc_parse_wwn(&buf[0], &wwpn);
1920 if (stat)
1921 return stat;
1922
1923 stat = fc_parse_wwn(&buf[17], &wwnn);
1924 if (stat)
1925 return stat;
1926
1927 spin_lock_irqsave(shost->host_lock, flags);
1928 match = 0;
1929 /* we only allow support on Channel 0 !!! */
1930 list_for_each_entry(vport, &fc_host->vports, peers) {
1931 if ((vport->channel == 0) &&
1932 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1933 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1934 break;
1935 vport->flags |= FC_VPORT_DELETING;
1936 match = 1;
1937 break;
1938 }
1939 }
1940 spin_unlock_irqrestore(shost->host_lock, flags);
1941
1942 if (!match)
1943 return -ENODEV;
1944
1945 stat = fc_vport_terminate(vport);
1946 return stat ? stat : count;
1947 }
1948 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1949 store_fc_host_vport_delete);
1950
1951
1952 static int fc_host_match(struct attribute_container *cont,
1953 struct device *dev)
1954 {
1955 struct Scsi_Host *shost;
1956 struct fc_internal *i;
1957
1958 if (!scsi_is_host_device(dev))
1959 return 0;
1960
1961 shost = dev_to_shost(dev);
1962 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1963 != &fc_host_class.class)
1964 return 0;
1965
1966 i = to_fc_internal(shost->transportt);
1967
1968 return &i->t.host_attrs.ac == cont;
1969 }
1970
1971 static int fc_target_match(struct attribute_container *cont,
1972 struct device *dev)
1973 {
1974 struct Scsi_Host *shost;
1975 struct fc_internal *i;
1976
1977 if (!scsi_is_target_device(dev))
1978 return 0;
1979
1980 shost = dev_to_shost(dev->parent);
1981 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1982 != &fc_host_class.class)
1983 return 0;
1984
1985 i = to_fc_internal(shost->transportt);
1986
1987 return &i->t.target_attrs.ac == cont;
1988 }
1989
1990 static void fc_rport_dev_release(struct device *dev)
1991 {
1992 struct fc_rport *rport = dev_to_rport(dev);
1993 put_device(dev->parent);
1994 kfree(rport);
1995 }
1996
1997 int scsi_is_fc_rport(const struct device *dev)
1998 {
1999 return dev->release == fc_rport_dev_release;
2000 }
2001 EXPORT_SYMBOL(scsi_is_fc_rport);
2002
2003 static int fc_rport_match(struct attribute_container *cont,
2004 struct device *dev)
2005 {
2006 struct Scsi_Host *shost;
2007 struct fc_internal *i;
2008
2009 if (!scsi_is_fc_rport(dev))
2010 return 0;
2011
2012 shost = dev_to_shost(dev->parent);
2013 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2014 != &fc_host_class.class)
2015 return 0;
2016
2017 i = to_fc_internal(shost->transportt);
2018
2019 return &i->rport_attr_cont.ac == cont;
2020 }
2021
2022
2023 static void fc_vport_dev_release(struct device *dev)
2024 {
2025 struct fc_vport *vport = dev_to_vport(dev);
2026 put_device(dev->parent); /* release kobj parent */
2027 kfree(vport);
2028 }
2029
2030 int scsi_is_fc_vport(const struct device *dev)
2031 {
2032 return dev->release == fc_vport_dev_release;
2033 }
2034 EXPORT_SYMBOL(scsi_is_fc_vport);
2035
2036 static int fc_vport_match(struct attribute_container *cont,
2037 struct device *dev)
2038 {
2039 struct fc_vport *vport;
2040 struct Scsi_Host *shost;
2041 struct fc_internal *i;
2042
2043 if (!scsi_is_fc_vport(dev))
2044 return 0;
2045 vport = dev_to_vport(dev);
2046
2047 shost = vport_to_shost(vport);
2048 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2049 != &fc_host_class.class)
2050 return 0;
2051
2052 i = to_fc_internal(shost->transportt);
2053 return &i->vport_attr_cont.ac == cont;
2054 }
2055
2056
2057 /**
2058 * fc_timed_out - FC Transport I/O timeout intercept handler
2059 * @scmd: The SCSI command which timed out
2060 *
2061 * This routine protects against error handlers getting invoked while a
2062 * rport is in a blocked state, typically due to a temporarily loss of
2063 * connectivity. If the error handlers are allowed to proceed, requests
2064 * to abort i/o, reset the target, etc will likely fail as there is no way
2065 * to communicate with the device to perform the requested function. These
2066 * failures may result in the midlayer taking the device offline, requiring
2067 * manual intervention to restore operation.
2068 *
2069 * This routine, called whenever an i/o times out, validates the state of
2070 * the underlying rport. If the rport is blocked, it returns
2071 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2072 * Eventually, either the device will return, or devloss_tmo will fire,
2073 * and when the timeout then fires, it will be handled normally.
2074 * If the rport is not blocked, normal error handling continues.
2075 *
2076 * Notes:
2077 * This routine assumes no locks are held on entry.
2078 */
2079 static enum blk_eh_timer_return
2080 fc_timed_out(struct scsi_cmnd *scmd)
2081 {
2082 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2083
2084 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2085 return BLK_EH_RESET_TIMER;
2086
2087 return BLK_EH_NOT_HANDLED;
2088 }
2089
2090 /*
2091 * Called by fc_user_scan to locate an rport on the shost that
2092 * matches the channel and target id, and invoke scsi_scan_target()
2093 * on the rport.
2094 */
2095 static void
2096 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2097 {
2098 struct fc_rport *rport;
2099 unsigned long flags;
2100
2101 spin_lock_irqsave(shost->host_lock, flags);
2102
2103 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2104 if (rport->scsi_target_id == -1)
2105 continue;
2106
2107 if (rport->port_state != FC_PORTSTATE_ONLINE)
2108 continue;
2109
2110 if ((channel == rport->channel) &&
2111 (id == rport->scsi_target_id)) {
2112 spin_unlock_irqrestore(shost->host_lock, flags);
2113 scsi_scan_target(&rport->dev, channel, id, lun, 1);
2114 return;
2115 }
2116 }
2117
2118 spin_unlock_irqrestore(shost->host_lock, flags);
2119 }
2120
2121 /*
2122 * Called via sysfs scan routines. Necessary, as the FC transport
2123 * wants to place all target objects below the rport object. So this
2124 * routine must invoke the scsi_scan_target() routine with the rport
2125 * object as the parent.
2126 */
2127 static int
2128 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2129 {
2130 uint chlo, chhi;
2131 uint tgtlo, tgthi;
2132
2133 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2134 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2135 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2136 return -EINVAL;
2137
2138 if (channel == SCAN_WILD_CARD) {
2139 chlo = 0;
2140 chhi = shost->max_channel + 1;
2141 } else {
2142 chlo = channel;
2143 chhi = channel + 1;
2144 }
2145
2146 if (id == SCAN_WILD_CARD) {
2147 tgtlo = 0;
2148 tgthi = shost->max_id;
2149 } else {
2150 tgtlo = id;
2151 tgthi = id + 1;
2152 }
2153
2154 for ( ; chlo < chhi; chlo++)
2155 for ( ; tgtlo < tgthi; tgtlo++)
2156 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2157
2158 return 0;
2159 }
2160
2161 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2162 int result)
2163 {
2164 struct fc_internal *i = to_fc_internal(shost->transportt);
2165 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2166 }
2167
2168 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2169 {
2170 struct fc_internal *i = to_fc_internal(shost->transportt);
2171 return i->f->it_nexus_response(shost, nexus, result);
2172 }
2173
2174 struct scsi_transport_template *
2175 fc_attach_transport(struct fc_function_template *ft)
2176 {
2177 int count;
2178 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2179 GFP_KERNEL);
2180
2181 if (unlikely(!i))
2182 return NULL;
2183
2184 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2185 i->t.target_attrs.ac.class = &fc_transport_class.class;
2186 i->t.target_attrs.ac.match = fc_target_match;
2187 i->t.target_size = sizeof(struct fc_starget_attrs);
2188 transport_container_register(&i->t.target_attrs);
2189
2190 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2191 i->t.host_attrs.ac.class = &fc_host_class.class;
2192 i->t.host_attrs.ac.match = fc_host_match;
2193 i->t.host_size = sizeof(struct fc_host_attrs);
2194 if (ft->get_fc_host_stats)
2195 i->t.host_attrs.statistics = &fc_statistics_group;
2196 transport_container_register(&i->t.host_attrs);
2197
2198 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2199 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2200 i->rport_attr_cont.ac.match = fc_rport_match;
2201 transport_container_register(&i->rport_attr_cont);
2202
2203 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2204 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2205 i->vport_attr_cont.ac.match = fc_vport_match;
2206 transport_container_register(&i->vport_attr_cont);
2207
2208 i->f = ft;
2209
2210 /* Transport uses the shost workq for scsi scanning */
2211 i->t.create_work_queue = 1;
2212
2213 i->t.eh_timed_out = fc_timed_out;
2214
2215 i->t.user_scan = fc_user_scan;
2216
2217 /* target-mode drivers' functions */
2218 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2219 i->t.it_nexus_response = fc_it_nexus_response;
2220
2221 /*
2222 * Setup SCSI Target Attributes.
2223 */
2224 count = 0;
2225 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2226 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2227 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2228
2229 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2230
2231 i->starget_attrs[count] = NULL;
2232
2233
2234 /*
2235 * Setup SCSI Host Attributes.
2236 */
2237 count=0;
2238 SETUP_HOST_ATTRIBUTE_RD(node_name);
2239 SETUP_HOST_ATTRIBUTE_RD(port_name);
2240 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2241 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2242 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2243 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2244 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2245 if (ft->vport_create) {
2246 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2247 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2248 }
2249 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2250 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2251 SETUP_HOST_ATTRIBUTE_RD(model);
2252 SETUP_HOST_ATTRIBUTE_RD(model_description);
2253 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2254 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2255 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2256 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2257
2258 SETUP_HOST_ATTRIBUTE_RD(port_id);
2259 SETUP_HOST_ATTRIBUTE_RD(port_type);
2260 SETUP_HOST_ATTRIBUTE_RD(port_state);
2261 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2262 SETUP_HOST_ATTRIBUTE_RD(speed);
2263 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2264 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2265 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2266
2267 /* Transport-managed attributes */
2268 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2269 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2270 if (ft->issue_fc_host_lip)
2271 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2272 if (ft->vport_create)
2273 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2274 if (ft->vport_delete)
2275 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2276
2277 BUG_ON(count > FC_HOST_NUM_ATTRS);
2278
2279 i->host_attrs[count] = NULL;
2280
2281 /*
2282 * Setup Remote Port Attributes.
2283 */
2284 count=0;
2285 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2286 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2287 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2288 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2289 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2290 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2291 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2292 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2293 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2294 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2295
2296 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2297
2298 i->rport_attrs[count] = NULL;
2299
2300 /*
2301 * Setup Virtual Port Attributes.
2302 */
2303 count=0;
2304 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2305 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2306 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2307 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2308 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2309 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2310 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2311 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2312 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2313
2314 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2315
2316 i->vport_attrs[count] = NULL;
2317
2318 return &i->t;
2319 }
2320 EXPORT_SYMBOL(fc_attach_transport);
2321
2322 void fc_release_transport(struct scsi_transport_template *t)
2323 {
2324 struct fc_internal *i = to_fc_internal(t);
2325
2326 transport_container_unregister(&i->t.target_attrs);
2327 transport_container_unregister(&i->t.host_attrs);
2328 transport_container_unregister(&i->rport_attr_cont);
2329 transport_container_unregister(&i->vport_attr_cont);
2330
2331 kfree(i);
2332 }
2333 EXPORT_SYMBOL(fc_release_transport);
2334
2335 /**
2336 * fc_queue_work - Queue work to the fc_host workqueue.
2337 * @shost: Pointer to Scsi_Host bound to fc_host.
2338 * @work: Work to queue for execution.
2339 *
2340 * Return value:
2341 * 1 - work queued for execution
2342 * 0 - work is already queued
2343 * -EINVAL - work queue doesn't exist
2344 */
2345 static int
2346 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2347 {
2348 if (unlikely(!fc_host_work_q(shost))) {
2349 printk(KERN_ERR
2350 "ERROR: FC host '%s' attempted to queue work, "
2351 "when no workqueue created.\n", shost->hostt->name);
2352 dump_stack();
2353
2354 return -EINVAL;
2355 }
2356
2357 return queue_work(fc_host_work_q(shost), work);
2358 }
2359
2360 /**
2361 * fc_flush_work - Flush a fc_host's workqueue.
2362 * @shost: Pointer to Scsi_Host bound to fc_host.
2363 */
2364 static void
2365 fc_flush_work(struct Scsi_Host *shost)
2366 {
2367 if (!fc_host_work_q(shost)) {
2368 printk(KERN_ERR
2369 "ERROR: FC host '%s' attempted to flush work, "
2370 "when no workqueue created.\n", shost->hostt->name);
2371 dump_stack();
2372 return;
2373 }
2374
2375 flush_workqueue(fc_host_work_q(shost));
2376 }
2377
2378 /**
2379 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2380 * @shost: Pointer to Scsi_Host bound to fc_host.
2381 * @work: Work to queue for execution.
2382 * @delay: jiffies to delay the work queuing
2383 *
2384 * Return value:
2385 * 1 on success / 0 already queued / < 0 for error
2386 */
2387 static int
2388 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2389 unsigned long delay)
2390 {
2391 if (unlikely(!fc_host_devloss_work_q(shost))) {
2392 printk(KERN_ERR
2393 "ERROR: FC host '%s' attempted to queue work, "
2394 "when no workqueue created.\n", shost->hostt->name);
2395 dump_stack();
2396
2397 return -EINVAL;
2398 }
2399
2400 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2401 }
2402
2403 /**
2404 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2405 * @shost: Pointer to Scsi_Host bound to fc_host.
2406 */
2407 static void
2408 fc_flush_devloss(struct Scsi_Host *shost)
2409 {
2410 if (!fc_host_devloss_work_q(shost)) {
2411 printk(KERN_ERR
2412 "ERROR: FC host '%s' attempted to flush work, "
2413 "when no workqueue created.\n", shost->hostt->name);
2414 dump_stack();
2415 return;
2416 }
2417
2418 flush_workqueue(fc_host_devloss_work_q(shost));
2419 }
2420
2421
2422 /**
2423 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2424 * @shost: Which &Scsi_Host
2425 *
2426 * This routine is expected to be called immediately preceding the
2427 * a driver's call to scsi_remove_host().
2428 *
2429 * WARNING: A driver utilizing the fc_transport, which fails to call
2430 * this routine prior to scsi_remove_host(), will leave dangling
2431 * objects in /sys/class/fc_remote_ports. Access to any of these
2432 * objects can result in a system crash !!!
2433 *
2434 * Notes:
2435 * This routine assumes no locks are held on entry.
2436 */
2437 void
2438 fc_remove_host(struct Scsi_Host *shost)
2439 {
2440 struct fc_vport *vport = NULL, *next_vport = NULL;
2441 struct fc_rport *rport = NULL, *next_rport = NULL;
2442 struct workqueue_struct *work_q;
2443 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2444 unsigned long flags;
2445
2446 spin_lock_irqsave(shost->host_lock, flags);
2447
2448 /* Remove any vports */
2449 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2450 fc_queue_work(shost, &vport->vport_delete_work);
2451
2452 /* Remove any remote ports */
2453 list_for_each_entry_safe(rport, next_rport,
2454 &fc_host->rports, peers) {
2455 list_del(&rport->peers);
2456 rport->port_state = FC_PORTSTATE_DELETED;
2457 fc_queue_work(shost, &rport->rport_delete_work);
2458 }
2459
2460 list_for_each_entry_safe(rport, next_rport,
2461 &fc_host->rport_bindings, peers) {
2462 list_del(&rport->peers);
2463 rport->port_state = FC_PORTSTATE_DELETED;
2464 fc_queue_work(shost, &rport->rport_delete_work);
2465 }
2466
2467 spin_unlock_irqrestore(shost->host_lock, flags);
2468
2469 /* flush all scan work items */
2470 scsi_flush_work(shost);
2471
2472 /* flush all stgt delete, and rport delete work items, then kill it */
2473 if (fc_host->work_q) {
2474 work_q = fc_host->work_q;
2475 fc_host->work_q = NULL;
2476 destroy_workqueue(work_q);
2477 }
2478
2479 /* flush all devloss work items, then kill it */
2480 if (fc_host->devloss_work_q) {
2481 work_q = fc_host->devloss_work_q;
2482 fc_host->devloss_work_q = NULL;
2483 destroy_workqueue(work_q);
2484 }
2485 }
2486 EXPORT_SYMBOL(fc_remove_host);
2487
2488 static void fc_terminate_rport_io(struct fc_rport *rport)
2489 {
2490 struct Scsi_Host *shost = rport_to_shost(rport);
2491 struct fc_internal *i = to_fc_internal(shost->transportt);
2492
2493 /* Involve the LLDD if possible to terminate all io on the rport. */
2494 if (i->f->terminate_rport_io)
2495 i->f->terminate_rport_io(rport);
2496
2497 /*
2498 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2499 */
2500 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2501 }
2502
2503 /**
2504 * fc_starget_delete - called to delete the scsi descendants of an rport
2505 * @work: remote port to be operated on.
2506 *
2507 * Deletes target and all sdevs.
2508 */
2509 static void
2510 fc_starget_delete(struct work_struct *work)
2511 {
2512 struct fc_rport *rport =
2513 container_of(work, struct fc_rport, stgt_delete_work);
2514
2515 fc_terminate_rport_io(rport);
2516 scsi_remove_target(&rport->dev);
2517 }
2518
2519
2520 /**
2521 * fc_rport_final_delete - finish rport termination and delete it.
2522 * @work: remote port to be deleted.
2523 */
2524 static void
2525 fc_rport_final_delete(struct work_struct *work)
2526 {
2527 struct fc_rport *rport =
2528 container_of(work, struct fc_rport, rport_delete_work);
2529 struct device *dev = &rport->dev;
2530 struct Scsi_Host *shost = rport_to_shost(rport);
2531 struct fc_internal *i = to_fc_internal(shost->transportt);
2532 unsigned long flags;
2533 int do_callback = 0;
2534
2535 fc_terminate_rport_io(rport);
2536
2537 /*
2538 * if a scan is pending, flush the SCSI Host work_q so that
2539 * that we can reclaim the rport scan work element.
2540 */
2541 if (rport->flags & FC_RPORT_SCAN_PENDING)
2542 scsi_flush_work(shost);
2543
2544 /*
2545 * Cancel any outstanding timers. These should really exist
2546 * only when rmmod'ing the LLDD and we're asking for
2547 * immediate termination of the rports
2548 */
2549 spin_lock_irqsave(shost->host_lock, flags);
2550 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2551 spin_unlock_irqrestore(shost->host_lock, flags);
2552 if (!cancel_delayed_work(&rport->fail_io_work))
2553 fc_flush_devloss(shost);
2554 if (!cancel_delayed_work(&rport->dev_loss_work))
2555 fc_flush_devloss(shost);
2556 cancel_work_sync(&rport->scan_work);
2557 spin_lock_irqsave(shost->host_lock, flags);
2558 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2559 }
2560 spin_unlock_irqrestore(shost->host_lock, flags);
2561
2562 /* Delete SCSI target and sdevs */
2563 if (rport->scsi_target_id != -1)
2564 fc_starget_delete(&rport->stgt_delete_work);
2565
2566 /*
2567 * Notify the driver that the rport is now dead. The LLDD will
2568 * also guarantee that any communication to the rport is terminated
2569 *
2570 * Avoid this call if we already called it when we preserved the
2571 * rport for the binding.
2572 */
2573 spin_lock_irqsave(shost->host_lock, flags);
2574 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2575 (i->f->dev_loss_tmo_callbk)) {
2576 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2577 do_callback = 1;
2578 }
2579 spin_unlock_irqrestore(shost->host_lock, flags);
2580
2581 if (do_callback)
2582 i->f->dev_loss_tmo_callbk(rport);
2583
2584 fc_bsg_remove(rport->rqst_q);
2585
2586 transport_remove_device(dev);
2587 device_del(dev);
2588 transport_destroy_device(dev);
2589 scsi_host_put(shost); /* for fc_host->rport list */
2590 put_device(dev); /* for self-reference */
2591 }
2592
2593
2594 /**
2595 * fc_rport_create - allocates and creates a remote FC port.
2596 * @shost: scsi host the remote port is connected to.
2597 * @channel: Channel on shost port connected to.
2598 * @ids: The world wide names, fc address, and FC4 port
2599 * roles for the remote port.
2600 *
2601 * Allocates and creates the remoter port structure, including the
2602 * class and sysfs creation.
2603 *
2604 * Notes:
2605 * This routine assumes no locks are held on entry.
2606 */
2607 static struct fc_rport *
2608 fc_rport_create(struct Scsi_Host *shost, int channel,
2609 struct fc_rport_identifiers *ids)
2610 {
2611 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2612 struct fc_internal *fci = to_fc_internal(shost->transportt);
2613 struct fc_rport *rport;
2614 struct device *dev;
2615 unsigned long flags;
2616 int error;
2617 size_t size;
2618
2619 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2620 rport = kzalloc(size, GFP_KERNEL);
2621 if (unlikely(!rport)) {
2622 printk(KERN_ERR "%s: allocation failure\n", __func__);
2623 return NULL;
2624 }
2625
2626 rport->maxframe_size = -1;
2627 rport->supported_classes = FC_COS_UNSPECIFIED;
2628 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2629 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2630 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2631 rport->port_id = ids->port_id;
2632 rport->roles = ids->roles;
2633 rport->port_state = FC_PORTSTATE_ONLINE;
2634 if (fci->f->dd_fcrport_size)
2635 rport->dd_data = &rport[1];
2636 rport->channel = channel;
2637 rport->fast_io_fail_tmo = -1;
2638
2639 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2640 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2641 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2642 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2643 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2644
2645 spin_lock_irqsave(shost->host_lock, flags);
2646
2647 rport->number = fc_host->next_rport_number++;
2648 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2649 rport->scsi_target_id = fc_host->next_target_id++;
2650 else
2651 rport->scsi_target_id = -1;
2652 list_add_tail(&rport->peers, &fc_host->rports);
2653 scsi_host_get(shost); /* for fc_host->rport list */
2654
2655 spin_unlock_irqrestore(shost->host_lock, flags);
2656
2657 dev = &rport->dev;
2658 device_initialize(dev); /* takes self reference */
2659 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2660 dev->release = fc_rport_dev_release;
2661 dev_set_name(dev, "rport-%d:%d-%d",
2662 shost->host_no, channel, rport->number);
2663 transport_setup_device(dev);
2664
2665 error = device_add(dev);
2666 if (error) {
2667 printk(KERN_ERR "FC Remote Port device_add failed\n");
2668 goto delete_rport;
2669 }
2670 transport_add_device(dev);
2671 transport_configure_device(dev);
2672
2673 fc_bsg_rportadd(shost, rport);
2674 /* ignore any bsg add error - we just can't do sgio */
2675
2676 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2677 /* initiate a scan of the target */
2678 rport->flags |= FC_RPORT_SCAN_PENDING;
2679 scsi_queue_work(shost, &rport->scan_work);
2680 }
2681
2682 return rport;
2683
2684 delete_rport:
2685 transport_destroy_device(dev);
2686 spin_lock_irqsave(shost->host_lock, flags);
2687 list_del(&rport->peers);
2688 scsi_host_put(shost); /* for fc_host->rport list */
2689 spin_unlock_irqrestore(shost->host_lock, flags);
2690 put_device(dev->parent);
2691 kfree(rport);
2692 return NULL;
2693 }
2694
2695 /**
2696 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2697 * @shost: scsi host the remote port is connected to.
2698 * @channel: Channel on shost port connected to.
2699 * @ids: The world wide names, fc address, and FC4 port
2700 * roles for the remote port.
2701 *
2702 * The LLDD calls this routine to notify the transport of the existence
2703 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2704 * of the port, it's FC address (port_id), and the FC4 roles that are
2705 * active for the port.
2706 *
2707 * For ports that are FCP targets (aka scsi targets), the FC transport
2708 * maintains consistent target id bindings on behalf of the LLDD.
2709 * A consistent target id binding is an assignment of a target id to
2710 * a remote port identifier, which persists while the scsi host is
2711 * attached. The remote port can disappear, then later reappear, and
2712 * it's target id assignment remains the same. This allows for shifts
2713 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2714 * changes to the scsi subsystem which is based on scsi host number and
2715 * target id values. Bindings are only valid during the attachment of
2716 * the scsi host. If the host detaches, then later re-attaches, target
2717 * id bindings may change.
2718 *
2719 * This routine is responsible for returning a remote port structure.
2720 * The routine will search the list of remote ports it maintains
2721 * internally on behalf of consistent target id mappings. If found, the
2722 * remote port structure will be reused. Otherwise, a new remote port
2723 * structure will be allocated.
2724 *
2725 * Whenever a remote port is allocated, a new fc_remote_port class
2726 * device is created.
2727 *
2728 * Should not be called from interrupt context.
2729 *
2730 * Notes:
2731 * This routine assumes no locks are held on entry.
2732 */
2733 struct fc_rport *
2734 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2735 struct fc_rport_identifiers *ids)
2736 {
2737 struct fc_internal *fci = to_fc_internal(shost->transportt);
2738 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2739 struct fc_rport *rport;
2740 unsigned long flags;
2741 int match = 0;
2742
2743 /* ensure any stgt delete functions are done */
2744 fc_flush_work(shost);
2745
2746 /*
2747 * Search the list of "active" rports, for an rport that has been
2748 * deleted, but we've held off the real delete while the target
2749 * is in a "blocked" state.
2750 */
2751 spin_lock_irqsave(shost->host_lock, flags);
2752
2753 list_for_each_entry(rport, &fc_host->rports, peers) {
2754
2755 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2756 (rport->channel == channel)) {
2757
2758 switch (fc_host->tgtid_bind_type) {
2759 case FC_TGTID_BIND_BY_WWPN:
2760 case FC_TGTID_BIND_NONE:
2761 if (rport->port_name == ids->port_name)
2762 match = 1;
2763 break;
2764 case FC_TGTID_BIND_BY_WWNN:
2765 if (rport->node_name == ids->node_name)
2766 match = 1;
2767 break;
2768 case FC_TGTID_BIND_BY_ID:
2769 if (rport->port_id == ids->port_id)
2770 match = 1;
2771 break;
2772 }
2773
2774 if (match) {
2775
2776 memcpy(&rport->node_name, &ids->node_name,
2777 sizeof(rport->node_name));
2778 memcpy(&rport->port_name, &ids->port_name,
2779 sizeof(rport->port_name));
2780 rport->port_id = ids->port_id;
2781
2782 rport->port_state = FC_PORTSTATE_ONLINE;
2783 rport->roles = ids->roles;
2784
2785 spin_unlock_irqrestore(shost->host_lock, flags);
2786
2787 if (fci->f->dd_fcrport_size)
2788 memset(rport->dd_data, 0,
2789 fci->f->dd_fcrport_size);
2790
2791 /*
2792 * If we were not a target, cancel the
2793 * io terminate and rport timers, and
2794 * we're done.
2795 *
2796 * If we were a target, but our new role
2797 * doesn't indicate a target, leave the
2798 * timers running expecting the role to
2799 * change as the target fully logs in. If
2800 * it doesn't, the target will be torn down.
2801 *
2802 * If we were a target, and our role shows
2803 * we're still a target, cancel the timers
2804 * and kick off a scan.
2805 */
2806
2807 /* was a target, not in roles */
2808 if ((rport->scsi_target_id != -1) &&
2809 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2810 return rport;
2811
2812 /*
2813 * Stop the fail io and dev_loss timers.
2814 * If they flush, the port_state will
2815 * be checked and will NOOP the function.
2816 */
2817 if (!cancel_delayed_work(&rport->fail_io_work))
2818 fc_flush_devloss(shost);
2819 if (!cancel_delayed_work(&rport->dev_loss_work))
2820 fc_flush_devloss(shost);
2821
2822 spin_lock_irqsave(shost->host_lock, flags);
2823
2824 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2825 FC_RPORT_DEVLOSS_PENDING |
2826 FC_RPORT_DEVLOSS_CALLBK_DONE);
2827
2828 spin_unlock_irqrestore(shost->host_lock, flags);
2829
2830 /* if target, initiate a scan */
2831 if (rport->scsi_target_id != -1) {
2832 scsi_target_unblock(&rport->dev,
2833 SDEV_RUNNING);
2834 spin_lock_irqsave(shost->host_lock,
2835 flags);
2836 rport->flags |= FC_RPORT_SCAN_PENDING;
2837 scsi_queue_work(shost,
2838 &rport->scan_work);
2839 spin_unlock_irqrestore(shost->host_lock,
2840 flags);
2841 }
2842
2843 fc_bsg_goose_queue(rport);
2844
2845 return rport;
2846 }
2847 }
2848 }
2849
2850 /*
2851 * Search the bindings array
2852 * Note: if never a FCP target, you won't be on this list
2853 */
2854 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2855
2856 /* search for a matching consistent binding */
2857
2858 list_for_each_entry(rport, &fc_host->rport_bindings,
2859 peers) {
2860 if (rport->channel != channel)
2861 continue;
2862
2863 switch (fc_host->tgtid_bind_type) {
2864 case FC_TGTID_BIND_BY_WWPN:
2865 if (rport->port_name == ids->port_name)
2866 match = 1;
2867 break;
2868 case FC_TGTID_BIND_BY_WWNN:
2869 if (rport->node_name == ids->node_name)
2870 match = 1;
2871 break;
2872 case FC_TGTID_BIND_BY_ID:
2873 if (rport->port_id == ids->port_id)
2874 match = 1;
2875 break;
2876 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2877 break;
2878 }
2879
2880 if (match) {
2881 list_move_tail(&rport->peers, &fc_host->rports);
2882 break;
2883 }
2884 }
2885
2886 if (match) {
2887 memcpy(&rport->node_name, &ids->node_name,
2888 sizeof(rport->node_name));
2889 memcpy(&rport->port_name, &ids->port_name,
2890 sizeof(rport->port_name));
2891 rport->port_id = ids->port_id;
2892 rport->roles = ids->roles;
2893 rport->port_state = FC_PORTSTATE_ONLINE;
2894 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2895
2896 if (fci->f->dd_fcrport_size)
2897 memset(rport->dd_data, 0,
2898 fci->f->dd_fcrport_size);
2899 spin_unlock_irqrestore(shost->host_lock, flags);
2900
2901 if (ids->roles & FC_PORT_ROLE_FCP_TARGET) {
2902 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
2903
2904 /* initiate a scan of the target */
2905 spin_lock_irqsave(shost->host_lock, flags);
2906 rport->flags |= FC_RPORT_SCAN_PENDING;
2907 scsi_queue_work(shost, &rport->scan_work);
2908 spin_unlock_irqrestore(shost->host_lock, flags);
2909 }
2910 return rport;
2911 }
2912 }
2913
2914 spin_unlock_irqrestore(shost->host_lock, flags);
2915
2916 /* No consistent binding found - create new remote port entry */
2917 rport = fc_rport_create(shost, channel, ids);
2918
2919 return rport;
2920 }
2921 EXPORT_SYMBOL(fc_remote_port_add);
2922
2923
2924 /**
2925 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2926 * @rport: The remote port that no longer exists
2927 *
2928 * The LLDD calls this routine to notify the transport that a remote
2929 * port is no longer part of the topology. Note: Although a port
2930 * may no longer be part of the topology, it may persist in the remote
2931 * ports displayed by the fc_host. We do this under 2 conditions:
2932 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2933 * This allows the port to temporarily disappear, then reappear without
2934 * disrupting the SCSI device tree attached to it. During the "blocked"
2935 * period the port will still exist.
2936 * 2) If the port was a scsi target and disappears for longer than we
2937 * expect, we'll delete the port and the tear down the SCSI device tree
2938 * attached to it. However, we want to semi-persist the target id assigned
2939 * to that port if it eventually does exist. The port structure will
2940 * remain (although with minimal information) so that the target id
2941 * bindings remails.
2942 *
2943 * If the remote port is not an FCP Target, it will be fully torn down
2944 * and deallocated, including the fc_remote_port class device.
2945 *
2946 * If the remote port is an FCP Target, the port will be placed in a
2947 * temporary blocked state. From the LLDD's perspective, the rport no
2948 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2949 * exists, but all sdevs on it are blocked from further I/O. The following
2950 * is then expected.
2951 *
2952 * If the remote port does not return (signaled by a LLDD call to
2953 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2954 * scsi target is removed - killing all outstanding i/o and removing the
2955 * scsi devices attached ot it. The port structure will be marked Not
2956 * Present and be partially cleared, leaving only enough information to
2957 * recognize the remote port relative to the scsi target id binding if
2958 * it later appears. The port will remain as long as there is a valid
2959 * binding (e.g. until the user changes the binding type or unloads the
2960 * scsi host with the binding).
2961 *
2962 * If the remote port returns within the dev_loss_tmo value (and matches
2963 * according to the target id binding type), the port structure will be
2964 * reused. If it is no longer a SCSI target, the target will be torn
2965 * down. If it continues to be a SCSI target, then the target will be
2966 * unblocked (allowing i/o to be resumed), and a scan will be activated
2967 * to ensure that all luns are detected.
2968 *
2969 * Called from normal process context only - cannot be called from interrupt.
2970 *
2971 * Notes:
2972 * This routine assumes no locks are held on entry.
2973 */
2974 void
2975 fc_remote_port_delete(struct fc_rport *rport)
2976 {
2977 struct Scsi_Host *shost = rport_to_shost(rport);
2978 unsigned long timeout = rport->dev_loss_tmo;
2979 unsigned long flags;
2980
2981 /*
2982 * No need to flush the fc_host work_q's, as all adds are synchronous.
2983 *
2984 * We do need to reclaim the rport scan work element, so eventually
2985 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2986 * there's still a scan pending.
2987 */
2988
2989 spin_lock_irqsave(shost->host_lock, flags);
2990
2991 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2992 spin_unlock_irqrestore(shost->host_lock, flags);
2993 return;
2994 }
2995
2996 /*
2997 * In the past, we if this was not an FCP-Target, we would
2998 * unconditionally just jump to deleting the rport.
2999 * However, rports can be used as node containers by the LLDD,
3000 * and its not appropriate to just terminate the rport at the
3001 * first sign of a loss in connectivity. The LLDD may want to
3002 * send ELS traffic to re-validate the login. If the rport is
3003 * immediately deleted, it makes it inappropriate for a node
3004 * container.
3005 * So... we now unconditionally wait dev_loss_tmo before
3006 * destroying an rport.
3007 */
3008
3009 rport->port_state = FC_PORTSTATE_BLOCKED;
3010
3011 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3012
3013 spin_unlock_irqrestore(shost->host_lock, flags);
3014
3015 scsi_target_block(&rport->dev);
3016
3017 /* see if we need to kill io faster than waiting for device loss */
3018 if ((rport->fast_io_fail_tmo != -1) &&
3019 (rport->fast_io_fail_tmo < timeout))
3020 fc_queue_devloss_work(shost, &rport->fail_io_work,
3021 rport->fast_io_fail_tmo * HZ);
3022
3023 /* cap the length the devices can be blocked until they are deleted */
3024 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3025 }
3026 EXPORT_SYMBOL(fc_remote_port_delete);
3027
3028 /**
3029 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3030 * @rport: The remote port that changed.
3031 * @roles: New roles for this port.
3032 *
3033 * Description: The LLDD calls this routine to notify the transport that the
3034 * roles on a remote port may have changed. The largest effect of this is
3035 * if a port now becomes a FCP Target, it must be allocated a
3036 * scsi target id. If the port is no longer a FCP target, any
3037 * scsi target id value assigned to it will persist in case the
3038 * role changes back to include FCP Target. No changes in the scsi
3039 * midlayer will be invoked if the role changes (in the expectation
3040 * that the role will be resumed. If it doesn't normal error processing
3041 * will take place).
3042 *
3043 * Should not be called from interrupt context.
3044 *
3045 * Notes:
3046 * This routine assumes no locks are held on entry.
3047 */
3048 void
3049 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3050 {
3051 struct Scsi_Host *shost = rport_to_shost(rport);
3052 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3053 unsigned long flags;
3054 int create = 0;
3055
3056 spin_lock_irqsave(shost->host_lock, flags);
3057 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3058 if (rport->scsi_target_id == -1) {
3059 rport->scsi_target_id = fc_host->next_target_id++;
3060 create = 1;
3061 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3062 create = 1;
3063 }
3064
3065 rport->roles = roles;
3066
3067 spin_unlock_irqrestore(shost->host_lock, flags);
3068
3069 if (create) {
3070 /*
3071 * There may have been a delete timer running on the
3072 * port. Ensure that it is cancelled as we now know
3073 * the port is an FCP Target.
3074 * Note: we know the rport is exists and in an online
3075 * state as the LLDD would not have had an rport
3076 * reference to pass us.
3077 *
3078 * Take no action on the del_timer failure as the state
3079 * machine state change will validate the
3080 * transaction.
3081 */
3082 if (!cancel_delayed_work(&rport->fail_io_work))
3083 fc_flush_devloss(shost);
3084 if (!cancel_delayed_work(&rport->dev_loss_work))
3085 fc_flush_devloss(shost);
3086
3087 spin_lock_irqsave(shost->host_lock, flags);
3088 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3089 FC_RPORT_DEVLOSS_PENDING |
3090 FC_RPORT_DEVLOSS_CALLBK_DONE);
3091 spin_unlock_irqrestore(shost->host_lock, flags);
3092
3093 /* ensure any stgt delete functions are done */
3094 fc_flush_work(shost);
3095
3096 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3097 /* initiate a scan of the target */
3098 spin_lock_irqsave(shost->host_lock, flags);
3099 rport->flags |= FC_RPORT_SCAN_PENDING;
3100 scsi_queue_work(shost, &rport->scan_work);
3101 spin_unlock_irqrestore(shost->host_lock, flags);
3102 }
3103 }
3104 EXPORT_SYMBOL(fc_remote_port_rolechg);
3105
3106 /**
3107 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3108 * @work: rport target that failed to reappear in the allotted time.
3109 *
3110 * Description: An attempt to delete a remote port blocks, and if it fails
3111 * to return in the allotted time this gets called.
3112 */
3113 static void
3114 fc_timeout_deleted_rport(struct work_struct *work)
3115 {
3116 struct fc_rport *rport =
3117 container_of(work, struct fc_rport, dev_loss_work.work);
3118 struct Scsi_Host *shost = rport_to_shost(rport);
3119 struct fc_internal *i = to_fc_internal(shost->transportt);
3120 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3121 unsigned long flags;
3122 int do_callback = 0;
3123
3124 spin_lock_irqsave(shost->host_lock, flags);
3125
3126 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3127
3128 /*
3129 * If the port is ONLINE, then it came back. If it was a SCSI
3130 * target, validate it still is. If not, tear down the
3131 * scsi_target on it.
3132 */
3133 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3134 (rport->scsi_target_id != -1) &&
3135 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3136 dev_printk(KERN_ERR, &rport->dev,
3137 "blocked FC remote port time out: no longer"
3138 " a FCP target, removing starget\n");
3139 spin_unlock_irqrestore(shost->host_lock, flags);
3140 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3141 fc_queue_work(shost, &rport->stgt_delete_work);
3142 return;
3143 }
3144
3145 /* NOOP state - we're flushing workq's */
3146 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3147 spin_unlock_irqrestore(shost->host_lock, flags);
3148 dev_printk(KERN_ERR, &rport->dev,
3149 "blocked FC remote port time out: leaving"
3150 " rport%s alone\n",
3151 (rport->scsi_target_id != -1) ? " and starget" : "");
3152 return;
3153 }
3154
3155 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3156 (rport->scsi_target_id == -1)) {
3157 list_del(&rport->peers);
3158 rport->port_state = FC_PORTSTATE_DELETED;
3159 dev_printk(KERN_ERR, &rport->dev,
3160 "blocked FC remote port time out: removing"
3161 " rport%s\n",
3162 (rport->scsi_target_id != -1) ? " and starget" : "");
3163 fc_queue_work(shost, &rport->rport_delete_work);
3164 spin_unlock_irqrestore(shost->host_lock, flags);
3165 return;
3166 }
3167
3168 dev_printk(KERN_ERR, &rport->dev,
3169 "blocked FC remote port time out: removing target and "
3170 "saving binding\n");
3171
3172 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3173
3174 /*
3175 * Note: We do not remove or clear the hostdata area. This allows
3176 * host-specific target data to persist along with the
3177 * scsi_target_id. It's up to the host to manage it's hostdata area.
3178 */
3179
3180 /*
3181 * Reinitialize port attributes that may change if the port comes back.
3182 */
3183 rport->maxframe_size = -1;
3184 rport->supported_classes = FC_COS_UNSPECIFIED;
3185 rport->roles = FC_PORT_ROLE_UNKNOWN;
3186 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3187 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3188
3189 /*
3190 * Pre-emptively kill I/O rather than waiting for the work queue
3191 * item to teardown the starget. (FCOE libFC folks prefer this
3192 * and to have the rport_port_id still set when it's done).
3193 */
3194 spin_unlock_irqrestore(shost->host_lock, flags);
3195 fc_terminate_rport_io(rport);
3196
3197 spin_lock_irqsave(shost->host_lock, flags);
3198
3199 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3200
3201 /* remove the identifiers that aren't used in the consisting binding */
3202 switch (fc_host->tgtid_bind_type) {
3203 case FC_TGTID_BIND_BY_WWPN:
3204 rport->node_name = -1;
3205 rport->port_id = -1;
3206 break;
3207 case FC_TGTID_BIND_BY_WWNN:
3208 rport->port_name = -1;
3209 rport->port_id = -1;
3210 break;
3211 case FC_TGTID_BIND_BY_ID:
3212 rport->node_name = -1;
3213 rport->port_name = -1;
3214 break;
3215 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3216 break;
3217 }
3218
3219 /*
3220 * As this only occurs if the remote port (scsi target)
3221 * went away and didn't come back - we'll remove
3222 * all attached scsi devices.
3223 */
3224 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3225 fc_queue_work(shost, &rport->stgt_delete_work);
3226
3227 do_callback = 1;
3228 }
3229
3230 spin_unlock_irqrestore(shost->host_lock, flags);
3231
3232 /*
3233 * Notify the driver that the rport is now dead. The LLDD will
3234 * also guarantee that any communication to the rport is terminated
3235 *
3236 * Note: we set the CALLBK_DONE flag above to correspond
3237 */
3238 if (do_callback && i->f->dev_loss_tmo_callbk)
3239 i->f->dev_loss_tmo_callbk(rport);
3240 }
3241
3242
3243 /**
3244 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3245 * @work: rport to terminate io on.
3246 *
3247 * Notes: Only requests the failure of the io, not that all are flushed
3248 * prior to returning.
3249 */
3250 static void
3251 fc_timeout_fail_rport_io(struct work_struct *work)
3252 {
3253 struct fc_rport *rport =
3254 container_of(work, struct fc_rport, fail_io_work.work);
3255
3256 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3257 return;
3258
3259 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3260 fc_terminate_rport_io(rport);
3261 }
3262
3263 /**
3264 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3265 * @work: remote port to be scanned.
3266 */
3267 static void
3268 fc_scsi_scan_rport(struct work_struct *work)
3269 {
3270 struct fc_rport *rport =
3271 container_of(work, struct fc_rport, scan_work);
3272 struct Scsi_Host *shost = rport_to_shost(rport);
3273 struct fc_internal *i = to_fc_internal(shost->transportt);
3274 unsigned long flags;
3275
3276 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3277 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3278 !(i->f->disable_target_scan)) {
3279 scsi_scan_target(&rport->dev, rport->channel,
3280 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3281 }
3282
3283 spin_lock_irqsave(shost->host_lock, flags);
3284 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3285 spin_unlock_irqrestore(shost->host_lock, flags);
3286 }
3287
3288 /**
3289 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3290 * @cmnd: SCSI command that scsi_eh is trying to recover
3291 *
3292 * This routine can be called from a FC LLD scsi_eh callback. It
3293 * blocks the scsi_eh thread until the fc_rport leaves the
3294 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3295 * necessary to avoid the scsi_eh failing recovery actions for blocked
3296 * rports which would lead to offlined SCSI devices.
3297 *
3298 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3299 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3300 * passed back to scsi_eh.
3301 */
3302 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3303 {
3304 struct Scsi_Host *shost = cmnd->device->host;
3305 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3306 unsigned long flags;
3307
3308 spin_lock_irqsave(shost->host_lock, flags);
3309 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3310 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3311 spin_unlock_irqrestore(shost->host_lock, flags);
3312 msleep(1000);
3313 spin_lock_irqsave(shost->host_lock, flags);
3314 }
3315 spin_unlock_irqrestore(shost->host_lock, flags);
3316
3317 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3318 return FAST_IO_FAIL;
3319
3320 return 0;
3321 }
3322 EXPORT_SYMBOL(fc_block_scsi_eh);
3323
3324 /**
3325 * fc_vport_setup - allocates and creates a FC virtual port.
3326 * @shost: scsi host the virtual port is connected to.
3327 * @channel: Channel on shost port connected to.
3328 * @pdev: parent device for vport
3329 * @ids: The world wide names, FC4 port roles, etc for
3330 * the virtual port.
3331 * @ret_vport: The pointer to the created vport.
3332 *
3333 * Allocates and creates the vport structure, calls the parent host
3334 * to instantiate the vport, the completes w/ class and sysfs creation.
3335 *
3336 * Notes:
3337 * This routine assumes no locks are held on entry.
3338 */
3339 static int
3340 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3341 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3342 {
3343 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3344 struct fc_internal *fci = to_fc_internal(shost->transportt);
3345 struct fc_vport *vport;
3346 struct device *dev;
3347 unsigned long flags;
3348 size_t size;
3349 int error;
3350
3351 *ret_vport = NULL;
3352
3353 if ( ! fci->f->vport_create)
3354 return -ENOENT;
3355
3356 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3357 vport = kzalloc(size, GFP_KERNEL);
3358 if (unlikely(!vport)) {
3359 printk(KERN_ERR "%s: allocation failure\n", __func__);
3360 return -ENOMEM;
3361 }
3362
3363 vport->vport_state = FC_VPORT_UNKNOWN;
3364 vport->vport_last_state = FC_VPORT_UNKNOWN;
3365 vport->node_name = ids->node_name;
3366 vport->port_name = ids->port_name;
3367 vport->roles = ids->roles;
3368 vport->vport_type = ids->vport_type;
3369 if (fci->f->dd_fcvport_size)
3370 vport->dd_data = &vport[1];
3371 vport->shost = shost;
3372 vport->channel = channel;
3373 vport->flags = FC_VPORT_CREATING;
3374 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3375
3376 spin_lock_irqsave(shost->host_lock, flags);
3377
3378 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3379 spin_unlock_irqrestore(shost->host_lock, flags);
3380 kfree(vport);
3381 return -ENOSPC;
3382 }
3383 fc_host->npiv_vports_inuse++;
3384 vport->number = fc_host->next_vport_number++;
3385 list_add_tail(&vport->peers, &fc_host->vports);
3386 scsi_host_get(shost); /* for fc_host->vport list */
3387
3388 spin_unlock_irqrestore(shost->host_lock, flags);
3389
3390 dev = &vport->dev;
3391 device_initialize(dev); /* takes self reference */
3392 dev->parent = get_device(pdev); /* takes parent reference */
3393 dev->release = fc_vport_dev_release;
3394 dev_set_name(dev, "vport-%d:%d-%d",
3395 shost->host_no, channel, vport->number);
3396 transport_setup_device(dev);
3397
3398 error = device_add(dev);
3399 if (error) {
3400 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3401 goto delete_vport;
3402 }
3403 transport_add_device(dev);
3404 transport_configure_device(dev);
3405
3406 error = fci->f->vport_create(vport, ids->disable);
3407 if (error) {
3408 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3409 goto delete_vport_all;
3410 }
3411
3412 /*
3413 * if the parent isn't the physical adapter's Scsi_Host, ensure
3414 * the Scsi_Host at least contains ia symlink to the vport.
3415 */
3416 if (pdev != &shost->shost_gendev) {
3417 error = sysfs_create_link(&shost->shost_gendev.kobj,
3418 &dev->kobj, dev_name(dev));
3419 if (error)
3420 printk(KERN_ERR
3421 "%s: Cannot create vport symlinks for "
3422 "%s, err=%d\n",
3423 __func__, dev_name(dev), error);
3424 }
3425 spin_lock_irqsave(shost->host_lock, flags);
3426 vport->flags &= ~FC_VPORT_CREATING;
3427 spin_unlock_irqrestore(shost->host_lock, flags);
3428
3429 dev_printk(KERN_NOTICE, pdev,
3430 "%s created via shost%d channel %d\n", dev_name(dev),
3431 shost->host_no, channel);
3432
3433 *ret_vport = vport;
3434
3435 return 0;
3436
3437 delete_vport_all:
3438 transport_remove_device(dev);
3439 device_del(dev);
3440 delete_vport:
3441 transport_destroy_device(dev);
3442 spin_lock_irqsave(shost->host_lock, flags);
3443 list_del(&vport->peers);
3444 scsi_host_put(shost); /* for fc_host->vport list */
3445 fc_host->npiv_vports_inuse--;
3446 spin_unlock_irqrestore(shost->host_lock, flags);
3447 put_device(dev->parent);
3448 kfree(vport);
3449
3450 return error;
3451 }
3452
3453 /**
3454 * fc_vport_create - Admin App or LLDD requests creation of a vport
3455 * @shost: scsi host the virtual port is connected to.
3456 * @channel: channel on shost port connected to.
3457 * @ids: The world wide names, FC4 port roles, etc for
3458 * the virtual port.
3459 *
3460 * Notes:
3461 * This routine assumes no locks are held on entry.
3462 */
3463 struct fc_vport *
3464 fc_vport_create(struct Scsi_Host *shost, int channel,
3465 struct fc_vport_identifiers *ids)
3466 {
3467 int stat;
3468 struct fc_vport *vport;
3469
3470 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3471 ids, &vport);
3472 return stat ? NULL : vport;
3473 }
3474 EXPORT_SYMBOL(fc_vport_create);
3475
3476 /**
3477 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3478 * @vport: fc_vport to be terminated
3479 *
3480 * Calls the LLDD vport_delete() function, then deallocates and removes
3481 * the vport from the shost and object tree.
3482 *
3483 * Notes:
3484 * This routine assumes no locks are held on entry.
3485 */
3486 int
3487 fc_vport_terminate(struct fc_vport *vport)
3488 {
3489 struct Scsi_Host *shost = vport_to_shost(vport);
3490 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3491 struct fc_internal *i = to_fc_internal(shost->transportt);
3492 struct device *dev = &vport->dev;
3493 unsigned long flags;
3494 int stat;
3495
3496 if (i->f->vport_delete)
3497 stat = i->f->vport_delete(vport);
3498 else
3499 stat = -ENOENT;
3500
3501 spin_lock_irqsave(shost->host_lock, flags);
3502 vport->flags &= ~FC_VPORT_DELETING;
3503 if (!stat) {
3504 vport->flags |= FC_VPORT_DELETED;
3505 list_del(&vport->peers);
3506 fc_host->npiv_vports_inuse--;
3507 scsi_host_put(shost); /* for fc_host->vport list */
3508 }
3509 spin_unlock_irqrestore(shost->host_lock, flags);
3510
3511 if (stat)
3512 return stat;
3513
3514 if (dev->parent != &shost->shost_gendev)
3515 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3516 transport_remove_device(dev);
3517 device_del(dev);
3518 transport_destroy_device(dev);
3519
3520 /*
3521 * Removing our self-reference should mean our
3522 * release function gets called, which will drop the remaining
3523 * parent reference and free the data structure.
3524 */
3525 put_device(dev); /* for self-reference */
3526
3527 return 0; /* SUCCESS */
3528 }
3529 EXPORT_SYMBOL(fc_vport_terminate);
3530
3531 /**
3532 * fc_vport_sched_delete - workq-based delete request for a vport
3533 * @work: vport to be deleted.
3534 */
3535 static void
3536 fc_vport_sched_delete(struct work_struct *work)
3537 {
3538 struct fc_vport *vport =
3539 container_of(work, struct fc_vport, vport_delete_work);
3540 int stat;
3541
3542 stat = fc_vport_terminate(vport);
3543 if (stat)
3544 dev_printk(KERN_ERR, vport->dev.parent,
3545 "%s: %s could not be deleted created via "
3546 "shost%d channel %d - error %d\n", __func__,
3547 dev_name(&vport->dev), vport->shost->host_no,
3548 vport->channel, stat);
3549 }
3550
3551
3552 /*
3553 * BSG support
3554 */
3555
3556
3557 /**
3558 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3559 * @job: fc_bsg_job that is to be torn down
3560 */
3561 static void
3562 fc_destroy_bsgjob(struct fc_bsg_job *job)
3563 {
3564 unsigned long flags;
3565
3566 spin_lock_irqsave(&job->job_lock, flags);
3567 if (job->ref_cnt) {
3568 spin_unlock_irqrestore(&job->job_lock, flags);
3569 return;
3570 }
3571 spin_unlock_irqrestore(&job->job_lock, flags);
3572
3573 put_device(job->dev); /* release reference for the request */
3574
3575 kfree(job->request_payload.sg_list);
3576 kfree(job->reply_payload.sg_list);
3577 kfree(job);
3578 }
3579
3580 /**
3581 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3582 * completed
3583 * @job: fc_bsg_job that is complete
3584 */
3585 static void
3586 fc_bsg_jobdone(struct fc_bsg_job *job)
3587 {
3588 struct request *req = job->req;
3589 struct request *rsp = req->next_rq;
3590 int err;
3591
3592 err = job->req->errors = job->reply->result;
3593
3594 if (err < 0)
3595 /* we're only returning the result field in the reply */
3596 job->req->sense_len = sizeof(uint32_t);
3597 else
3598 job->req->sense_len = job->reply_len;
3599
3600 /* we assume all request payload was transferred, residual == 0 */
3601 req->resid_len = 0;
3602
3603 if (rsp) {
3604 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3605
3606 /* set reply (bidi) residual */
3607 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3608 rsp->resid_len);
3609 }
3610 blk_complete_request(req);
3611 }
3612
3613 /**
3614 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3615 * @rq: BSG request that holds the job to be destroyed
3616 */
3617 static void fc_bsg_softirq_done(struct request *rq)
3618 {
3619 struct fc_bsg_job *job = rq->special;
3620 unsigned long flags;
3621
3622 spin_lock_irqsave(&job->job_lock, flags);
3623 job->state_flags |= FC_RQST_STATE_DONE;
3624 job->ref_cnt--;
3625 spin_unlock_irqrestore(&job->job_lock, flags);
3626
3627 blk_end_request_all(rq, rq->errors);
3628 fc_destroy_bsgjob(job);
3629 }
3630
3631 /**
3632 * fc_bsg_job_timeout - handler for when a bsg request timesout
3633 * @req: request that timed out
3634 */
3635 static enum blk_eh_timer_return
3636 fc_bsg_job_timeout(struct request *req)
3637 {
3638 struct fc_bsg_job *job = (void *) req->special;
3639 struct Scsi_Host *shost = job->shost;
3640 struct fc_internal *i = to_fc_internal(shost->transportt);
3641 unsigned long flags;
3642 int err = 0, done = 0;
3643
3644 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3645 return BLK_EH_RESET_TIMER;
3646
3647 spin_lock_irqsave(&job->job_lock, flags);
3648 if (job->state_flags & FC_RQST_STATE_DONE)
3649 done = 1;
3650 else
3651 job->ref_cnt++;
3652 spin_unlock_irqrestore(&job->job_lock, flags);
3653
3654 if (!done && i->f->bsg_timeout) {
3655 /* call LLDD to abort the i/o as it has timed out */
3656 err = i->f->bsg_timeout(job);
3657 if (err == -EAGAIN) {
3658 job->ref_cnt--;
3659 return BLK_EH_RESET_TIMER;
3660 } else if (err)
3661 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3662 "abort failed with status %d\n", err);
3663 }
3664
3665 /* the blk_end_sync_io() doesn't check the error */
3666 if (done)
3667 return BLK_EH_NOT_HANDLED;
3668 else
3669 return BLK_EH_HANDLED;
3670 }
3671
3672 static int
3673 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3674 {
3675 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3676
3677 BUG_ON(!req->nr_phys_segments);
3678
3679 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3680 if (!buf->sg_list)
3681 return -ENOMEM;
3682 sg_init_table(buf->sg_list, req->nr_phys_segments);
3683 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3684 buf->payload_len = blk_rq_bytes(req);
3685 return 0;
3686 }
3687
3688
3689 /**
3690 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3691 * bsg request
3692 * @shost: SCSI Host corresponding to the bsg object
3693 * @rport: (optional) FC Remote Port corresponding to the bsg object
3694 * @req: BSG request that needs a job structure
3695 */
3696 static int
3697 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3698 struct request *req)
3699 {
3700 struct fc_internal *i = to_fc_internal(shost->transportt);
3701 struct request *rsp = req->next_rq;
3702 struct fc_bsg_job *job;
3703 int ret;
3704
3705 BUG_ON(req->special);
3706
3707 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3708 GFP_KERNEL);
3709 if (!job)
3710 return -ENOMEM;
3711
3712 /*
3713 * Note: this is a bit silly.
3714 * The request gets formatted as a SGIO v4 ioctl request, which
3715 * then gets reformatted as a blk request, which then gets
3716 * reformatted as a fc bsg request. And on completion, we have
3717 * to wrap return results such that SGIO v4 thinks it was a scsi
3718 * status. I hope this was all worth it.
3719 */
3720
3721 req->special = job;
3722 job->shost = shost;
3723 job->rport = rport;
3724 job->req = req;
3725 if (i->f->dd_bsg_size)
3726 job->dd_data = (void *)&job[1];
3727 spin_lock_init(&job->job_lock);
3728 job->request = (struct fc_bsg_request *)req->cmd;
3729 job->request_len = req->cmd_len;
3730 job->reply = req->sense;
3731 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3732 * allocated */
3733 if (req->bio) {
3734 ret = fc_bsg_map_buffer(&job->request_payload, req);
3735 if (ret)
3736 goto failjob_rls_job;
3737 }
3738 if (rsp && rsp->bio) {
3739 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3740 if (ret)
3741 goto failjob_rls_rqst_payload;
3742 }
3743 job->job_done = fc_bsg_jobdone;
3744 if (rport)
3745 job->dev = &rport->dev;
3746 else
3747 job->dev = &shost->shost_gendev;
3748 get_device(job->dev); /* take a reference for the request */
3749
3750 job->ref_cnt = 1;
3751
3752 return 0;
3753
3754
3755 failjob_rls_rqst_payload:
3756 kfree(job->request_payload.sg_list);
3757 failjob_rls_job:
3758 kfree(job);
3759 return -ENOMEM;
3760 }
3761
3762
3763 enum fc_dispatch_result {
3764 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3765 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3766 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3767 };
3768
3769
3770 /**
3771 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3772 * @q: fc host request queue
3773 * @shost: scsi host rport attached to
3774 * @job: bsg job to be processed
3775 */
3776 static enum fc_dispatch_result
3777 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3778 struct fc_bsg_job *job)
3779 {
3780 struct fc_internal *i = to_fc_internal(shost->transportt);
3781 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3782 int ret;
3783
3784 /* Validate the host command */
3785 switch (job->request->msgcode) {
3786 case FC_BSG_HST_ADD_RPORT:
3787 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3788 break;
3789
3790 case FC_BSG_HST_DEL_RPORT:
3791 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3792 break;
3793
3794 case FC_BSG_HST_ELS_NOLOGIN:
3795 cmdlen += sizeof(struct fc_bsg_host_els);
3796 /* there better be a xmt and rcv payloads */
3797 if ((!job->request_payload.payload_len) ||
3798 (!job->reply_payload.payload_len)) {
3799 ret = -EINVAL;
3800 goto fail_host_msg;
3801 }
3802 break;
3803
3804 case FC_BSG_HST_CT:
3805 cmdlen += sizeof(struct fc_bsg_host_ct);
3806 /* there better be xmt and rcv payloads */
3807 if ((!job->request_payload.payload_len) ||
3808 (!job->reply_payload.payload_len)) {
3809 ret = -EINVAL;
3810 goto fail_host_msg;
3811 }
3812 break;
3813
3814 case FC_BSG_HST_VENDOR:
3815 cmdlen += sizeof(struct fc_bsg_host_vendor);
3816 if ((shost->hostt->vendor_id == 0L) ||
3817 (job->request->rqst_data.h_vendor.vendor_id !=
3818 shost->hostt->vendor_id)) {
3819 ret = -ESRCH;
3820 goto fail_host_msg;
3821 }
3822 break;
3823
3824 default:
3825 ret = -EBADR;
3826 goto fail_host_msg;
3827 }
3828
3829 /* check if we really have all the request data needed */
3830 if (job->request_len < cmdlen) {
3831 ret = -ENOMSG;
3832 goto fail_host_msg;
3833 }
3834
3835 ret = i->f->bsg_request(job);
3836 if (!ret)
3837 return FC_DISPATCH_UNLOCKED;
3838
3839 fail_host_msg:
3840 /* return the errno failure code as the only status */
3841 BUG_ON(job->reply_len < sizeof(uint32_t));
3842 job->reply->reply_payload_rcv_len = 0;
3843 job->reply->result = ret;
3844 job->reply_len = sizeof(uint32_t);
3845 fc_bsg_jobdone(job);
3846 return FC_DISPATCH_UNLOCKED;
3847 }
3848
3849
3850 /*
3851 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3852 * @rport: rport to be restarted
3853 */
3854 static void
3855 fc_bsg_goose_queue(struct fc_rport *rport)
3856 {
3857 if (!rport->rqst_q)
3858 return;
3859
3860 /*
3861 * This get/put dance makes no sense
3862 */
3863 get_device(&rport->dev);
3864 blk_run_queue_async(rport->rqst_q);
3865 put_device(&rport->dev);
3866 }
3867
3868 /**
3869 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3870 * @q: rport request queue
3871 * @shost: scsi host rport attached to
3872 * @rport: rport request destined to
3873 * @job: bsg job to be processed
3874 */
3875 static enum fc_dispatch_result
3876 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3877 struct fc_rport *rport, struct fc_bsg_job *job)
3878 {
3879 struct fc_internal *i = to_fc_internal(shost->transportt);
3880 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3881 int ret;
3882
3883 /* Validate the rport command */
3884 switch (job->request->msgcode) {
3885 case FC_BSG_RPT_ELS:
3886 cmdlen += sizeof(struct fc_bsg_rport_els);
3887 goto check_bidi;
3888
3889 case FC_BSG_RPT_CT:
3890 cmdlen += sizeof(struct fc_bsg_rport_ct);
3891 check_bidi:
3892 /* there better be xmt and rcv payloads */
3893 if ((!job->request_payload.payload_len) ||
3894 (!job->reply_payload.payload_len)) {
3895 ret = -EINVAL;
3896 goto fail_rport_msg;
3897 }
3898 break;
3899 default:
3900 ret = -EBADR;
3901 goto fail_rport_msg;
3902 }
3903
3904 /* check if we really have all the request data needed */
3905 if (job->request_len < cmdlen) {
3906 ret = -ENOMSG;
3907 goto fail_rport_msg;
3908 }
3909
3910 ret = i->f->bsg_request(job);
3911 if (!ret)
3912 return FC_DISPATCH_UNLOCKED;
3913
3914 fail_rport_msg:
3915 /* return the errno failure code as the only status */
3916 BUG_ON(job->reply_len < sizeof(uint32_t));
3917 job->reply->reply_payload_rcv_len = 0;
3918 job->reply->result = ret;
3919 job->reply_len = sizeof(uint32_t);
3920 fc_bsg_jobdone(job);
3921 return FC_DISPATCH_UNLOCKED;
3922 }
3923
3924
3925 /**
3926 * fc_bsg_request_handler - generic handler for bsg requests
3927 * @q: request queue to manage
3928 * @shost: Scsi_Host related to the bsg object
3929 * @rport: FC remote port related to the bsg object (optional)
3930 * @dev: device structure for bsg object
3931 */
3932 static void
3933 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3934 struct fc_rport *rport, struct device *dev)
3935 {
3936 struct request *req;
3937 struct fc_bsg_job *job;
3938 enum fc_dispatch_result ret;
3939
3940 if (!get_device(dev))
3941 return;
3942
3943 while (1) {
3944 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3945 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3946 break;
3947
3948 req = blk_fetch_request(q);
3949 if (!req)
3950 break;
3951
3952 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3953 req->errors = -ENXIO;
3954 spin_unlock_irq(q->queue_lock);
3955 blk_end_request_all(req, -ENXIO);
3956 spin_lock_irq(q->queue_lock);
3957 continue;
3958 }
3959
3960 spin_unlock_irq(q->queue_lock);
3961
3962 ret = fc_req_to_bsgjob(shost, rport, req);
3963 if (ret) {
3964 req->errors = ret;
3965 blk_end_request_all(req, ret);
3966 spin_lock_irq(q->queue_lock);
3967 continue;
3968 }
3969
3970 job = req->special;
3971
3972 /* check if we have the msgcode value at least */
3973 if (job->request_len < sizeof(uint32_t)) {
3974 BUG_ON(job->reply_len < sizeof(uint32_t));
3975 job->reply->reply_payload_rcv_len = 0;
3976 job->reply->result = -ENOMSG;
3977 job->reply_len = sizeof(uint32_t);
3978 fc_bsg_jobdone(job);
3979 spin_lock_irq(q->queue_lock);
3980 continue;
3981 }
3982
3983 /* the dispatch routines will unlock the queue_lock */
3984 if (rport)
3985 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3986 else
3987 ret = fc_bsg_host_dispatch(q, shost, job);
3988
3989 /* did dispatcher hit state that can't process any more */
3990 if (ret == FC_DISPATCH_BREAK)
3991 break;
3992
3993 /* did dispatcher had released the lock */
3994 if (ret == FC_DISPATCH_UNLOCKED)
3995 spin_lock_irq(q->queue_lock);
3996 }
3997
3998 spin_unlock_irq(q->queue_lock);
3999 put_device(dev);
4000 spin_lock_irq(q->queue_lock);
4001 }
4002
4003
4004 /**
4005 * fc_bsg_host_handler - handler for bsg requests for a fc host
4006 * @q: fc host request queue
4007 */
4008 static void
4009 fc_bsg_host_handler(struct request_queue *q)
4010 {
4011 struct Scsi_Host *shost = q->queuedata;
4012
4013 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
4014 }
4015
4016
4017 /**
4018 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
4019 * @q: rport request queue
4020 */
4021 static void
4022 fc_bsg_rport_handler(struct request_queue *q)
4023 {
4024 struct fc_rport *rport = q->queuedata;
4025 struct Scsi_Host *shost = rport_to_shost(rport);
4026
4027 fc_bsg_request_handler(q, shost, rport, &rport->dev);
4028 }
4029
4030
4031 /**
4032 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4033 * @shost: shost for fc_host
4034 * @fc_host: fc_host adding the structures to
4035 */
4036 static int
4037 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4038 {
4039 struct device *dev = &shost->shost_gendev;
4040 struct fc_internal *i = to_fc_internal(shost->transportt);
4041 struct request_queue *q;
4042 int err;
4043 char bsg_name[20];
4044
4045 fc_host->rqst_q = NULL;
4046
4047 if (!i->f->bsg_request)
4048 return -ENOTSUPP;
4049
4050 snprintf(bsg_name, sizeof(bsg_name),
4051 "fc_host%d", shost->host_no);
4052
4053 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4054 if (!q) {
4055 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4056 "initialize - no request queue\n",
4057 shost->host_no);
4058 return -ENOMEM;
4059 }
4060
4061 q->queuedata = shost;
4062 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4063 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4064 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4065 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4066
4067 err = bsg_register_queue(q, dev, bsg_name, NULL);
4068 if (err) {
4069 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4070 "initialize - register queue\n",
4071 shost->host_no);
4072 blk_cleanup_queue(q);
4073 return err;
4074 }
4075
4076 fc_host->rqst_q = q;
4077 return 0;
4078 }
4079
4080
4081 /**
4082 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4083 * @shost: shost that rport is attached to
4084 * @rport: rport that the bsg hooks are being attached to
4085 */
4086 static int
4087 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4088 {
4089 struct device *dev = &rport->dev;
4090 struct fc_internal *i = to_fc_internal(shost->transportt);
4091 struct request_queue *q;
4092 int err;
4093
4094 rport->rqst_q = NULL;
4095
4096 if (!i->f->bsg_request)
4097 return -ENOTSUPP;
4098
4099 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4100 if (!q) {
4101 printk(KERN_ERR "%s: bsg interface failed to "
4102 "initialize - no request queue\n",
4103 dev->kobj.name);
4104 return -ENOMEM;
4105 }
4106
4107 q->queuedata = rport;
4108 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4109 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4110 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4111 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4112
4113 err = bsg_register_queue(q, dev, NULL, NULL);
4114 if (err) {
4115 printk(KERN_ERR "%s: bsg interface failed to "
4116 "initialize - register queue\n",
4117 dev->kobj.name);
4118 blk_cleanup_queue(q);
4119 return err;
4120 }
4121
4122 rport->rqst_q = q;
4123 return 0;
4124 }
4125
4126
4127 /**
4128 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4129 * @q: the request_queue that is to be torn down.
4130 *
4131 * Notes:
4132 * Before unregistering the queue empty any requests that are blocked
4133 *
4134 *
4135 */
4136 static void
4137 fc_bsg_remove(struct request_queue *q)
4138 {
4139 if (q) {
4140 bsg_unregister_queue(q);
4141 blk_cleanup_queue(q);
4142 }
4143 }
4144
4145
4146 /* Original Author: Martin Hicks */
4147 MODULE_AUTHOR("James Smart");
4148 MODULE_DESCRIPTION("FC Transport Attributes");
4149 MODULE_LICENSE("GPL");
4150
4151 module_init(fc_transport_init);
4152 module_exit(fc_transport_exit);
Linux kernel - Deliverables
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