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