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