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[PATCH] radix-tree documentation cleanups
[linux-2.6/mini2440.git] / drivers / scsi / scsi_transport_fc.c
blob8db656214b5ca4ba461417b2fe2c315214513d32
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) 2004-2005 James Smart, Emulex Corporation
23 * Rewrite for host, target, device, and remote port attributes,
24 * statistics, and service functions...
25 *
26 */
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/sched.h> /* workqueue stuff, HZ */
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_fc.h>
34 #include <scsi/scsi_cmnd.h>
35 #include "scsi_priv.h"
36
37 /*
38 * Redefine so that we can have same named attributes in the
39 * sdev/starget/host objects.
40 */
41 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
42 struct class_device_attribute class_device_attr_##_prefix##_##_name = \
43 __ATTR(_name,_mode,_show,_store)
44
45 #define fc_enum_name_search(title, table_type, table) \
46 static const char *get_fc_##title##_name(enum table_type table_key) \
47 { \
48 int i; \
49 char *name = NULL; \
50 \
51 for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
52 if (table[i].value == table_key) { \
53 name = table[i].name; \
54 break; \
55 } \
56 } \
57 return name; \
58 }
59
60 #define fc_enum_name_match(title, table_type, table) \
61 static int get_fc_##title##_match(const char *table_key, \
62 enum table_type *value) \
63 { \
64 int i; \
65 \
66 for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
67 if (strncmp(table_key, table[i].name, \
68 table[i].matchlen) == 0) { \
69 *value = table[i].value; \
70 return 0; /* success */ \
71 } \
72 } \
73 return 1; /* failure */ \
74 }
75
76
77 /* Convert fc_port_type values to ascii string name */
78 static struct {
79 enum fc_port_type value;
80 char *name;
81 } fc_port_type_names[] = {
82 { FC_PORTTYPE_UNKNOWN, "Unknown" },
83 { FC_PORTTYPE_OTHER, "Other" },
84 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
85 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
86 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
87 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
88 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection" },
89 };
90 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
91 #define FC_PORTTYPE_MAX_NAMELEN 50
92
93
94 /* Convert fc_port_state values to ascii string name */
95 static struct {
96 enum fc_port_state value;
97 char *name;
98 } fc_port_state_names[] = {
99 { FC_PORTSTATE_UNKNOWN, "Unknown" },
100 { FC_PORTSTATE_NOTPRESENT, "Not Present" },
101 { FC_PORTSTATE_ONLINE, "Online" },
102 { FC_PORTSTATE_OFFLINE, "Offline" },
103 { FC_PORTSTATE_BLOCKED, "Blocked" },
104 { FC_PORTSTATE_BYPASSED, "Bypassed" },
105 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics" },
106 { FC_PORTSTATE_LINKDOWN, "Linkdown" },
107 { FC_PORTSTATE_ERROR, "Error" },
108 { FC_PORTSTATE_LOOPBACK, "Loopback" },
109 { FC_PORTSTATE_DELETED, "Deleted" },
110 };
111 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
112 #define FC_PORTSTATE_MAX_NAMELEN 20
113
114
115 /* Convert fc_tgtid_binding_type values to ascii string name */
116 static const struct {
117 enum fc_tgtid_binding_type value;
118 char *name;
119 int matchlen;
120 } fc_tgtid_binding_type_names[] = {
121 { FC_TGTID_BIND_NONE, "none", 4 },
122 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
123 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
124 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
125 };
126 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
127 fc_tgtid_binding_type_names)
128 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
129 fc_tgtid_binding_type_names)
130 #define FC_BINDTYPE_MAX_NAMELEN 30
131
132
133 #define fc_bitfield_name_search(title, table) \
134 static ssize_t \
135 get_fc_##title##_names(u32 table_key, char *buf) \
136 { \
137 char *prefix = ""; \
138 ssize_t len = 0; \
139 int i; \
140 \
141 for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) { \
142 if (table[i].value & table_key) { \
143 len += sprintf(buf + len, "%s%s", \
144 prefix, table[i].name); \
145 prefix = ", "; \
146 } \
147 } \
148 len += sprintf(buf + len, "\n"); \
149 return len; \
150 }
151
152
153 /* Convert FC_COS bit values to ascii string name */
154 static const struct {
155 u32 value;
156 char *name;
157 } fc_cos_names[] = {
158 { FC_COS_CLASS1, "Class 1" },
159 { FC_COS_CLASS2, "Class 2" },
160 { FC_COS_CLASS3, "Class 3" },
161 { FC_COS_CLASS4, "Class 4" },
162 { FC_COS_CLASS6, "Class 6" },
163 };
164 fc_bitfield_name_search(cos, fc_cos_names)
165
166
167 /* Convert FC_PORTSPEED bit values to ascii string name */
168 static const struct {
169 u32 value;
170 char *name;
171 } fc_port_speed_names[] = {
172 { FC_PORTSPEED_1GBIT, "1 Gbit" },
173 { FC_PORTSPEED_2GBIT, "2 Gbit" },
174 { FC_PORTSPEED_4GBIT, "4 Gbit" },
175 { FC_PORTSPEED_10GBIT, "10 Gbit" },
176 { FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
177 };
178 fc_bitfield_name_search(port_speed, fc_port_speed_names)
179
180
181 static int
182 show_fc_fc4s (char *buf, u8 *fc4_list)
183 {
184 int i, len=0;
185
186 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
187 len += sprintf(buf + len , "0x%02x ", *fc4_list);
188 len += sprintf(buf + len, "\n");
189 return len;
190 }
191
192
193 /* Convert FC_RPORT_ROLE bit values to ascii string name */
194 static const struct {
195 u32 value;
196 char *name;
197 } fc_remote_port_role_names[] = {
198 { FC_RPORT_ROLE_FCP_TARGET, "FCP Target" },
199 { FC_RPORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
200 { FC_RPORT_ROLE_IP_PORT, "IP Port" },
201 };
202 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
203
204 /*
205 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
206 */
207 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
208 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
209 #define FC_FPORT_PORTID 0x00000e
210 #define FC_FABCTLR_PORTID 0x00000d
211 #define FC_DIRSRVR_PORTID 0x00000c
212 #define FC_TIMESRVR_PORTID 0x00000b
213 #define FC_MGMTSRVR_PORTID 0x00000a
214
215
216 static void fc_shost_remove_rports(void *data);
217 static void fc_timeout_deleted_rport(void *data);
218 static void fc_scsi_scan_rport(void *data);
219 static void fc_rport_terminate(struct fc_rport *rport);
220
221 /*
222 * Attribute counts pre object type...
223 * Increase these values if you add attributes
224 */
225 #define FC_STARGET_NUM_ATTRS 3
226 #define FC_RPORT_NUM_ATTRS 9
227 #define FC_HOST_NUM_ATTRS 17
228
229 struct fc_internal {
230 struct scsi_transport_template t;
231 struct fc_function_template *f;
232
233 /*
234 * For attributes : each object has :
235 * An array of the actual attributes structures
236 * An array of null-terminated pointers to the attribute
237 * structures - used for mid-layer interaction.
238 *
239 * The attribute containers for the starget and host are are
240 * part of the midlayer. As the remote port is specific to the
241 * fc transport, we must provide the attribute container.
242 */
243 struct class_device_attribute private_starget_attrs[
244 FC_STARGET_NUM_ATTRS];
245 struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
246
247 struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
248 struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
249
250 struct transport_container rport_attr_cont;
251 struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
252 struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
253 };
254
255 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
256
257 static int fc_target_setup(struct transport_container *tc, struct device *dev,
258 struct class_device *cdev)
259 {
260 struct scsi_target *starget = to_scsi_target(dev);
261 struct fc_rport *rport = starget_to_rport(starget);
262
263 /*
264 * if parent is remote port, use values from remote port.
265 * Otherwise, this host uses the fc_transport, but not the
266 * remote port interface. As such, initialize to known non-values.
267 */
268 if (rport) {
269 fc_starget_node_name(starget) = rport->node_name;
270 fc_starget_port_name(starget) = rport->port_name;
271 fc_starget_port_id(starget) = rport->port_id;
272 } else {
273 fc_starget_node_name(starget) = -1;
274 fc_starget_port_name(starget) = -1;
275 fc_starget_port_id(starget) = -1;
276 }
277
278 return 0;
279 }
280
281 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
282 "fc_transport",
283 fc_target_setup,
284 NULL,
285 NULL);
286
287 static int fc_host_setup(struct transport_container *tc, struct device *dev,
288 struct class_device *cdev)
289 {
290 struct Scsi_Host *shost = dev_to_shost(dev);
291
292 /*
293 * Set default values easily detected by the midlayer as
294 * failure cases. The scsi lldd is responsible for initializing
295 * all transport attributes to valid values per host.
296 */
297 fc_host_node_name(shost) = -1;
298 fc_host_port_name(shost) = -1;
299 fc_host_permanent_port_name(shost) = -1;
300 fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
301 memset(fc_host_supported_fc4s(shost), 0,
302 sizeof(fc_host_supported_fc4s(shost)));
303 memset(fc_host_symbolic_name(shost), 0,
304 sizeof(fc_host_symbolic_name(shost)));
305 fc_host_supported_speeds(shost) = FC_PORTSPEED_UNKNOWN;
306 fc_host_maxframe_size(shost) = -1;
307 memset(fc_host_serial_number(shost), 0,
308 sizeof(fc_host_serial_number(shost)));
309
310 fc_host_port_id(shost) = -1;
311 fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
312 fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
313 memset(fc_host_active_fc4s(shost), 0,
314 sizeof(fc_host_active_fc4s(shost)));
315 fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
316 fc_host_fabric_name(shost) = -1;
317
318 fc_host_tgtid_bind_type(shost) = FC_TGTID_BIND_BY_WWPN;
319
320 INIT_LIST_HEAD(&fc_host_rports(shost));
321 INIT_LIST_HEAD(&fc_host_rport_bindings(shost));
322 fc_host_next_rport_number(shost) = 0;
323 fc_host_next_target_id(shost) = 0;
324
325 fc_host_flags(shost) = 0;
326 INIT_WORK(&fc_host_rport_del_work(shost), fc_shost_remove_rports, shost);
327 return 0;
328 }
329
330 static DECLARE_TRANSPORT_CLASS(fc_host_class,
331 "fc_host",
332 fc_host_setup,
333 NULL,
334 NULL);
335
336 /*
337 * Setup and Remove actions for remote ports are handled
338 * in the service functions below.
339 */
340 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
341 "fc_remote_ports",
342 NULL,
343 NULL,
344 NULL);
345
346 /*
347 * Module Parameters
348 */
349
350 /*
351 * dev_loss_tmo: the default number of seconds that the FC transport
352 * should insulate the loss of a remote port.
353 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
354 */
355 static unsigned int fc_dev_loss_tmo = SCSI_DEVICE_BLOCK_MAX_TIMEOUT;
356
357 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
358 MODULE_PARM_DESC(dev_loss_tmo,
359 "Maximum number of seconds that the FC transport should"
360 " insulate the loss of a remote port. Once this value is"
361 " exceeded, the scsi target is removed. Value should be"
362 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
363
364
365 static __init int fc_transport_init(void)
366 {
367 int error = transport_class_register(&fc_host_class);
368 if (error)
369 return error;
370 error = transport_class_register(&fc_rport_class);
371 if (error)
372 return error;
373 return transport_class_register(&fc_transport_class);
374 }
375
376 static void __exit fc_transport_exit(void)
377 {
378 transport_class_unregister(&fc_transport_class);
379 transport_class_unregister(&fc_rport_class);
380 transport_class_unregister(&fc_host_class);
381 }
382
383 /*
384 * FC Remote Port Attribute Management
385 */
386
387 #define fc_rport_show_function(field, format_string, sz, cast) \
388 static ssize_t \
389 show_fc_rport_##field (struct class_device *cdev, char *buf) \
390 { \
391 struct fc_rport *rport = transport_class_to_rport(cdev); \
392 struct Scsi_Host *shost = rport_to_shost(rport); \
393 struct fc_internal *i = to_fc_internal(shost->transportt); \
394 if ((i->f->get_rport_##field) && \
395 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
396 (rport->port_state == FC_PORTSTATE_DELETED) || \
397 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
398 i->f->get_rport_##field(rport); \
399 return snprintf(buf, sz, format_string, cast rport->field); \
400 }
401
402 #define fc_rport_store_function(field) \
403 static ssize_t \
404 store_fc_rport_##field(struct class_device *cdev, const char *buf, \
405 size_t count) \
406 { \
407 int val; \
408 struct fc_rport *rport = transport_class_to_rport(cdev); \
409 struct Scsi_Host *shost = rport_to_shost(rport); \
410 struct fc_internal *i = to_fc_internal(shost->transportt); \
411 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
412 (rport->port_state == FC_PORTSTATE_DELETED) || \
413 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
414 return -EBUSY; \
415 val = simple_strtoul(buf, NULL, 0); \
416 i->f->set_rport_##field(rport, val); \
417 return count; \
418 }
419
420 #define fc_rport_rd_attr(field, format_string, sz) \
421 fc_rport_show_function(field, format_string, sz, ) \
422 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
423 show_fc_rport_##field, NULL)
424
425 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
426 fc_rport_show_function(field, format_string, sz, (cast)) \
427 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
428 show_fc_rport_##field, NULL)
429
430 #define fc_rport_rw_attr(field, format_string, sz) \
431 fc_rport_show_function(field, format_string, sz, ) \
432 fc_rport_store_function(field) \
433 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
434 show_fc_rport_##field, \
435 store_fc_rport_##field)
436
437
438 #define fc_private_rport_show_function(field, format_string, sz, cast) \
439 static ssize_t \
440 show_fc_rport_##field (struct class_device *cdev, char *buf) \
441 { \
442 struct fc_rport *rport = transport_class_to_rport(cdev); \
443 return snprintf(buf, sz, format_string, cast rport->field); \
444 }
445
446 #define fc_private_rport_rd_attr(field, format_string, sz) \
447 fc_private_rport_show_function(field, format_string, sz, ) \
448 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
449 show_fc_rport_##field, NULL)
450
451 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
452 fc_private_rport_show_function(field, format_string, sz, (cast)) \
453 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO, \
454 show_fc_rport_##field, NULL)
455
456
457 #define fc_private_rport_rd_enum_attr(title, maxlen) \
458 static ssize_t \
459 show_fc_rport_##title (struct class_device *cdev, char *buf) \
460 { \
461 struct fc_rport *rport = transport_class_to_rport(cdev); \
462 const char *name; \
463 name = get_fc_##title##_name(rport->title); \
464 if (!name) \
465 return -EINVAL; \
466 return snprintf(buf, maxlen, "%s\n", name); \
467 } \
468 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO, \
469 show_fc_rport_##title, NULL)
470
471
472 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
473 i->private_rport_attrs[count] = class_device_attr_rport_##field; \
474 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
475 i->private_rport_attrs[count].store = NULL; \
476 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
477 if (i->f->show_rport_##field) \
478 count++
479
480 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
481 i->private_rport_attrs[count] = class_device_attr_rport_##field; \
482 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
483 i->private_rport_attrs[count].store = NULL; \
484 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
485 count++
486
487 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
488 i->private_rport_attrs[count] = class_device_attr_rport_##field; \
489 if (!i->f->set_rport_##field) { \
490 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
491 i->private_rport_attrs[count].store = NULL; \
492 } \
493 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
494 if (i->f->show_rport_##field) \
495 count++
496
497
498 /* The FC Transport Remote Port Attributes: */
499
500 /* Fixed Remote Port Attributes */
501
502 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
503
504 static ssize_t
505 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
506 {
507 struct fc_rport *rport = transport_class_to_rport(cdev);
508 if (rport->supported_classes == FC_COS_UNSPECIFIED)
509 return snprintf(buf, 20, "unspecified\n");
510 return get_fc_cos_names(rport->supported_classes, buf);
511 }
512 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
513 show_fc_rport_supported_classes, NULL);
514
515 /* Dynamic Remote Port Attributes */
516
517 /*
518 * dev_loss_tmo attribute
519 */
520 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
521 static ssize_t
522 store_fc_rport_dev_loss_tmo(struct class_device *cdev, const char *buf,
523 size_t count)
524 {
525 int val;
526 struct fc_rport *rport = transport_class_to_rport(cdev);
527 struct Scsi_Host *shost = rport_to_shost(rport);
528 struct fc_internal *i = to_fc_internal(shost->transportt);
529 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
530 (rport->port_state == FC_PORTSTATE_DELETED) ||
531 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
532 return -EBUSY;
533 val = simple_strtoul(buf, NULL, 0);
534 if ((val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
535 return -EINVAL;
536 i->f->set_rport_dev_loss_tmo(rport, val);
537 return count;
538 }
539 static FC_CLASS_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
540 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
541
542
543 /* Private Remote Port Attributes */
544
545 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
546 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
547 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
548
549 static ssize_t
550 show_fc_rport_roles (struct class_device *cdev, char *buf)
551 {
552 struct fc_rport *rport = transport_class_to_rport(cdev);
553
554 /* identify any roles that are port_id specific */
555 if ((rport->port_id != -1) &&
556 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
557 FC_WELLKNOWN_PORTID_MASK) {
558 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
559 case FC_FPORT_PORTID:
560 return snprintf(buf, 30, "Fabric Port\n");
561 case FC_FABCTLR_PORTID:
562 return snprintf(buf, 30, "Fabric Controller\n");
563 case FC_DIRSRVR_PORTID:
564 return snprintf(buf, 30, "Directory Server\n");
565 case FC_TIMESRVR_PORTID:
566 return snprintf(buf, 30, "Time Server\n");
567 case FC_MGMTSRVR_PORTID:
568 return snprintf(buf, 30, "Management Server\n");
569 default:
570 return snprintf(buf, 30, "Unknown Fabric Entity\n");
571 }
572 } else {
573 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
574 return snprintf(buf, 20, "unknown\n");
575 return get_fc_remote_port_roles_names(rport->roles, buf);
576 }
577 }
578 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
579 show_fc_rport_roles, NULL);
580
581 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
582 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
583
584
585
586 /*
587 * FC SCSI Target Attribute Management
588 */
589
590 /*
591 * Note: in the target show function we recognize when the remote
592 * port is in the heirarchy and do not allow the driver to get
593 * involved in sysfs functions. The driver only gets involved if
594 * it's the "old" style that doesn't use rports.
595 */
596 #define fc_starget_show_function(field, format_string, sz, cast) \
597 static ssize_t \
598 show_fc_starget_##field (struct class_device *cdev, char *buf) \
599 { \
600 struct scsi_target *starget = transport_class_to_starget(cdev); \
601 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
602 struct fc_internal *i = to_fc_internal(shost->transportt); \
603 struct fc_rport *rport = starget_to_rport(starget); \
604 if (rport) \
605 fc_starget_##field(starget) = rport->field; \
606 else if (i->f->get_starget_##field) \
607 i->f->get_starget_##field(starget); \
608 return snprintf(buf, sz, format_string, \
609 cast fc_starget_##field(starget)); \
610 }
611
612 #define fc_starget_rd_attr(field, format_string, sz) \
613 fc_starget_show_function(field, format_string, sz, ) \
614 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO, \
615 show_fc_starget_##field, NULL)
616
617 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
618 fc_starget_show_function(field, format_string, sz, (cast)) \
619 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO, \
620 show_fc_starget_##field, NULL)
621
622 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
623 i->private_starget_attrs[count] = class_device_attr_starget_##field; \
624 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
625 i->private_starget_attrs[count].store = NULL; \
626 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
627 if (i->f->show_starget_##field) \
628 count++
629
630 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
631 i->private_starget_attrs[count] = class_device_attr_starget_##field; \
632 if (!i->f->set_starget_##field) { \
633 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
634 i->private_starget_attrs[count].store = NULL; \
635 } \
636 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
637 if (i->f->show_starget_##field) \
638 count++
639
640 /* The FC Transport SCSI Target Attributes: */
641 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
642 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
643 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
644
645
646 /*
647 * Host Attribute Management
648 */
649
650 #define fc_host_show_function(field, format_string, sz, cast) \
651 static ssize_t \
652 show_fc_host_##field (struct class_device *cdev, char *buf) \
653 { \
654 struct Scsi_Host *shost = transport_class_to_shost(cdev); \
655 struct fc_internal *i = to_fc_internal(shost->transportt); \
656 if (i->f->get_host_##field) \
657 i->f->get_host_##field(shost); \
658 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
659 }
660
661 #define fc_host_store_function(field) \
662 static ssize_t \
663 store_fc_host_##field(struct class_device *cdev, const char *buf, \
664 size_t count) \
665 { \
666 int val; \
667 struct Scsi_Host *shost = transport_class_to_shost(cdev); \
668 struct fc_internal *i = to_fc_internal(shost->transportt); \
669 \
670 val = simple_strtoul(buf, NULL, 0); \
671 i->f->set_host_##field(shost, val); \
672 return count; \
673 }
674
675 #define fc_host_rd_attr(field, format_string, sz) \
676 fc_host_show_function(field, format_string, sz, ) \
677 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
678 show_fc_host_##field, NULL)
679
680 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
681 fc_host_show_function(field, format_string, sz, (cast)) \
682 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
683 show_fc_host_##field, NULL)
684
685 #define fc_host_rw_attr(field, format_string, sz) \
686 fc_host_show_function(field, format_string, sz, ) \
687 fc_host_store_function(field) \
688 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
689 show_fc_host_##field, \
690 store_fc_host_##field)
691
692 #define fc_host_rd_enum_attr(title, maxlen) \
693 static ssize_t \
694 show_fc_host_##title (struct class_device *cdev, char *buf) \
695 { \
696 struct Scsi_Host *shost = transport_class_to_shost(cdev); \
697 struct fc_internal *i = to_fc_internal(shost->transportt); \
698 const char *name; \
699 if (i->f->get_host_##title) \
700 i->f->get_host_##title(shost); \
701 name = get_fc_##title##_name(fc_host_##title(shost)); \
702 if (!name) \
703 return -EINVAL; \
704 return snprintf(buf, maxlen, "%s\n", name); \
705 } \
706 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
707
708 #define SETUP_HOST_ATTRIBUTE_RD(field) \
709 i->private_host_attrs[count] = class_device_attr_host_##field; \
710 i->private_host_attrs[count].attr.mode = S_IRUGO; \
711 i->private_host_attrs[count].store = NULL; \
712 i->host_attrs[count] = &i->private_host_attrs[count]; \
713 if (i->f->show_host_##field) \
714 count++
715
716 #define SETUP_HOST_ATTRIBUTE_RW(field) \
717 i->private_host_attrs[count] = class_device_attr_host_##field; \
718 if (!i->f->set_host_##field) { \
719 i->private_host_attrs[count].attr.mode = S_IRUGO; \
720 i->private_host_attrs[count].store = NULL; \
721 } \
722 i->host_attrs[count] = &i->private_host_attrs[count]; \
723 if (i->f->show_host_##field) \
724 count++
725
726
727 #define fc_private_host_show_function(field, format_string, sz, cast) \
728 static ssize_t \
729 show_fc_host_##field (struct class_device *cdev, char *buf) \
730 { \
731 struct Scsi_Host *shost = transport_class_to_shost(cdev); \
732 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
733 }
734
735 #define fc_private_host_rd_attr(field, format_string, sz) \
736 fc_private_host_show_function(field, format_string, sz, ) \
737 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
738 show_fc_host_##field, NULL)
739
740 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
741 fc_private_host_show_function(field, format_string, sz, (cast)) \
742 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO, \
743 show_fc_host_##field, NULL)
744
745 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
746 i->private_host_attrs[count] = class_device_attr_host_##field; \
747 i->private_host_attrs[count].attr.mode = S_IRUGO; \
748 i->private_host_attrs[count].store = NULL; \
749 i->host_attrs[count] = &i->private_host_attrs[count]; \
750 count++
751
752 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
753 { \
754 i->private_host_attrs[count] = class_device_attr_host_##field; \
755 i->host_attrs[count] = &i->private_host_attrs[count]; \
756 count++; \
757 }
758
759
760 /* Fixed Host Attributes */
761
762 static ssize_t
763 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
764 {
765 struct Scsi_Host *shost = transport_class_to_shost(cdev);
766
767 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
768 return snprintf(buf, 20, "unspecified\n");
769
770 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
771 }
772 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
773 show_fc_host_supported_classes, NULL);
774
775 static ssize_t
776 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
777 {
778 struct Scsi_Host *shost = transport_class_to_shost(cdev);
779 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
780 }
781 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
782 show_fc_host_supported_fc4s, NULL);
783
784 static ssize_t
785 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
786 {
787 struct Scsi_Host *shost = transport_class_to_shost(cdev);
788
789 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
790 return snprintf(buf, 20, "unknown\n");
791
792 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
793 }
794 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
795 show_fc_host_supported_speeds, NULL);
796
797
798 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
799 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
800 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
801 unsigned long long);
802 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
803 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
804 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
805
806
807 /* Dynamic Host Attributes */
808
809 static ssize_t
810 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
811 {
812 struct Scsi_Host *shost = transport_class_to_shost(cdev);
813 struct fc_internal *i = to_fc_internal(shost->transportt);
814
815 if (i->f->get_host_active_fc4s)
816 i->f->get_host_active_fc4s(shost);
817
818 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
819 }
820 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
821 show_fc_host_active_fc4s, NULL);
822
823 static ssize_t
824 show_fc_host_speed (struct class_device *cdev, char *buf)
825 {
826 struct Scsi_Host *shost = transport_class_to_shost(cdev);
827 struct fc_internal *i = to_fc_internal(shost->transportt);
828
829 if (i->f->get_host_speed)
830 i->f->get_host_speed(shost);
831
832 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
833 return snprintf(buf, 20, "unknown\n");
834
835 return get_fc_port_speed_names(fc_host_speed(shost), buf);
836 }
837 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
838 show_fc_host_speed, NULL);
839
840
841 fc_host_rd_attr(port_id, "0x%06x\n", 20);
842 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
843 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
844 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
845
846
847 /* Private Host Attributes */
848
849 static ssize_t
850 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
851 {
852 struct Scsi_Host *shost = transport_class_to_shost(cdev);
853 const char *name;
854
855 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
856 if (!name)
857 return -EINVAL;
858 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
859 }
860
861 #define get_list_head_entry(pos, head, member) \
862 pos = list_entry((head)->next, typeof(*pos), member)
863
864 static ssize_t
865 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
866 const char *buf, size_t count)
867 {
868 struct Scsi_Host *shost = transport_class_to_shost(cdev);
869 struct fc_rport *rport;
870 enum fc_tgtid_binding_type val;
871 unsigned long flags;
872
873 if (get_fc_tgtid_bind_type_match(buf, &val))
874 return -EINVAL;
875
876 /* if changing bind type, purge all unused consistent bindings */
877 if (val != fc_host_tgtid_bind_type(shost)) {
878 spin_lock_irqsave(shost->host_lock, flags);
879 while (!list_empty(&fc_host_rport_bindings(shost))) {
880 get_list_head_entry(rport,
881 &fc_host_rport_bindings(shost), peers);
882 spin_unlock_irqrestore(shost->host_lock, flags);
883 fc_rport_terminate(rport);
884 spin_lock_irqsave(shost->host_lock, flags);
885 }
886 spin_unlock_irqrestore(shost->host_lock, flags);
887 }
888
889 fc_host_tgtid_bind_type(shost) = val;
890 return count;
891 }
892
893 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
894 show_fc_private_host_tgtid_bind_type,
895 store_fc_private_host_tgtid_bind_type);
896
897 static ssize_t
898 store_fc_private_host_issue_lip(struct class_device *cdev,
899 const char *buf, size_t count)
900 {
901 struct Scsi_Host *shost = transport_class_to_shost(cdev);
902 struct fc_internal *i = to_fc_internal(shost->transportt);
903 int ret;
904
905 /* ignore any data value written to the attribute */
906 if (i->f->issue_fc_host_lip) {
907 ret = i->f->issue_fc_host_lip(shost);
908 return ret ? ret: count;
909 }
910
911 return -ENOENT;
912 }
913
914 static FC_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
915 store_fc_private_host_issue_lip);
916
917 /*
918 * Host Statistics Management
919 */
920
921 /* Show a given an attribute in the statistics group */
922 static ssize_t
923 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
924 {
925 struct Scsi_Host *shost = transport_class_to_shost(cdev);
926 struct fc_internal *i = to_fc_internal(shost->transportt);
927 struct fc_host_statistics *stats;
928 ssize_t ret = -ENOENT;
929
930 if (offset > sizeof(struct fc_host_statistics) ||
931 offset % sizeof(u64) != 0)
932 WARN_ON(1);
933
934 if (i->f->get_fc_host_stats) {
935 stats = (i->f->get_fc_host_stats)(shost);
936 if (stats)
937 ret = snprintf(buf, 20, "0x%llx\n",
938 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
939 }
940 return ret;
941 }
942
943
944 /* generate a read-only statistics attribute */
945 #define fc_host_statistic(name) \
946 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf) \
947 { \
948 return fc_stat_show(cd, buf, \
949 offsetof(struct fc_host_statistics, name)); \
950 } \
951 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
952
953 fc_host_statistic(seconds_since_last_reset);
954 fc_host_statistic(tx_frames);
955 fc_host_statistic(tx_words);
956 fc_host_statistic(rx_frames);
957 fc_host_statistic(rx_words);
958 fc_host_statistic(lip_count);
959 fc_host_statistic(nos_count);
960 fc_host_statistic(error_frames);
961 fc_host_statistic(dumped_frames);
962 fc_host_statistic(link_failure_count);
963 fc_host_statistic(loss_of_sync_count);
964 fc_host_statistic(loss_of_signal_count);
965 fc_host_statistic(prim_seq_protocol_err_count);
966 fc_host_statistic(invalid_tx_word_count);
967 fc_host_statistic(invalid_crc_count);
968 fc_host_statistic(fcp_input_requests);
969 fc_host_statistic(fcp_output_requests);
970 fc_host_statistic(fcp_control_requests);
971 fc_host_statistic(fcp_input_megabytes);
972 fc_host_statistic(fcp_output_megabytes);
973
974 static ssize_t
975 fc_reset_statistics(struct class_device *cdev, const char *buf,
976 size_t count)
977 {
978 struct Scsi_Host *shost = transport_class_to_shost(cdev);
979 struct fc_internal *i = to_fc_internal(shost->transportt);
980
981 /* ignore any data value written to the attribute */
982 if (i->f->reset_fc_host_stats) {
983 i->f->reset_fc_host_stats(shost);
984 return count;
985 }
986
987 return -ENOENT;
988 }
989 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
990 fc_reset_statistics);
991
992
993 static struct attribute *fc_statistics_attrs[] = {
994 &class_device_attr_host_seconds_since_last_reset.attr,
995 &class_device_attr_host_tx_frames.attr,
996 &class_device_attr_host_tx_words.attr,
997 &class_device_attr_host_rx_frames.attr,
998 &class_device_attr_host_rx_words.attr,
999 &class_device_attr_host_lip_count.attr,
1000 &class_device_attr_host_nos_count.attr,
1001 &class_device_attr_host_error_frames.attr,
1002 &class_device_attr_host_dumped_frames.attr,
1003 &class_device_attr_host_link_failure_count.attr,
1004 &class_device_attr_host_loss_of_sync_count.attr,
1005 &class_device_attr_host_loss_of_signal_count.attr,
1006 &class_device_attr_host_prim_seq_protocol_err_count.attr,
1007 &class_device_attr_host_invalid_tx_word_count.attr,
1008 &class_device_attr_host_invalid_crc_count.attr,
1009 &class_device_attr_host_fcp_input_requests.attr,
1010 &class_device_attr_host_fcp_output_requests.attr,
1011 &class_device_attr_host_fcp_control_requests.attr,
1012 &class_device_attr_host_fcp_input_megabytes.attr,
1013 &class_device_attr_host_fcp_output_megabytes.attr,
1014 &class_device_attr_host_reset_statistics.attr,
1015 NULL
1016 };
1017
1018 static struct attribute_group fc_statistics_group = {
1019 .name = "statistics",
1020 .attrs = fc_statistics_attrs,
1021 };
1022
1023 static int fc_host_match(struct attribute_container *cont,
1024 struct device *dev)
1025 {
1026 struct Scsi_Host *shost;
1027 struct fc_internal *i;
1028
1029 if (!scsi_is_host_device(dev))
1030 return 0;
1031
1032 shost = dev_to_shost(dev);
1033 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1034 != &fc_host_class.class)
1035 return 0;
1036
1037 i = to_fc_internal(shost->transportt);
1038
1039 return &i->t.host_attrs.ac == cont;
1040 }
1041
1042 static int fc_target_match(struct attribute_container *cont,
1043 struct device *dev)
1044 {
1045 struct Scsi_Host *shost;
1046 struct fc_internal *i;
1047
1048 if (!scsi_is_target_device(dev))
1049 return 0;
1050
1051 shost = dev_to_shost(dev->parent);
1052 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1053 != &fc_host_class.class)
1054 return 0;
1055
1056 i = to_fc_internal(shost->transportt);
1057
1058 return &i->t.target_attrs.ac == cont;
1059 }
1060
1061 static void fc_rport_dev_release(struct device *dev)
1062 {
1063 struct fc_rport *rport = dev_to_rport(dev);
1064 put_device(dev->parent);
1065 kfree(rport);
1066 }
1067
1068 int scsi_is_fc_rport(const struct device *dev)
1069 {
1070 return dev->release == fc_rport_dev_release;
1071 }
1072 EXPORT_SYMBOL(scsi_is_fc_rport);
1073
1074 static int fc_rport_match(struct attribute_container *cont,
1075 struct device *dev)
1076 {
1077 struct Scsi_Host *shost;
1078 struct fc_internal *i;
1079
1080 if (!scsi_is_fc_rport(dev))
1081 return 0;
1082
1083 shost = dev_to_shost(dev->parent);
1084 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1085 != &fc_host_class.class)
1086 return 0;
1087
1088 i = to_fc_internal(shost->transportt);
1089
1090 return &i->rport_attr_cont.ac == cont;
1091 }
1092
1093
1094 /**
1095 * fc_timed_out - FC Transport I/O timeout intercept handler
1096 *
1097 * @scmd: The SCSI command which timed out
1098 *
1099 * This routine protects against error handlers getting invoked while a
1100 * rport is in a blocked state, typically due to a temporarily loss of
1101 * connectivity. If the error handlers are allowed to proceed, requests
1102 * to abort i/o, reset the target, etc will likely fail as there is no way
1103 * to communicate with the device to perform the requested function. These
1104 * failures may result in the midlayer taking the device offline, requiring
1105 * manual intervention to restore operation.
1106 *
1107 * This routine, called whenever an i/o times out, validates the state of
1108 * the underlying rport. If the rport is blocked, it returns
1109 * EH_RESET_TIMER, which will continue to reschedule the timeout.
1110 * Eventually, either the device will return, or devloss_tmo will fire,
1111 * and when the timeout then fires, it will be handled normally.
1112 * If the rport is not blocked, normal error handling continues.
1113 *
1114 * Notes:
1115 * This routine assumes no locks are held on entry.
1116 **/
1117 static enum scsi_eh_timer_return
1118 fc_timed_out(struct scsi_cmnd *scmd)
1119 {
1120 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1121
1122 if (rport->port_state == FC_PORTSTATE_BLOCKED)
1123 return EH_RESET_TIMER;
1124
1125 return EH_NOT_HANDLED;
1126 }
1127
1128 /*
1129 * Must be called with shost->host_lock held
1130 */
1131 static int fc_user_scan(struct Scsi_Host *shost, uint channel,
1132 uint id, uint lun)
1133 {
1134 struct fc_rport *rport;
1135
1136 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1137 if (rport->scsi_target_id == -1)
1138 continue;
1139
1140 if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
1141 (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
1142 scsi_scan_target(&rport->dev, rport->channel,
1143 rport->scsi_target_id, lun, 1);
1144 }
1145 }
1146
1147 return 0;
1148 }
1149
1150 struct scsi_transport_template *
1151 fc_attach_transport(struct fc_function_template *ft)
1152 {
1153 int count;
1154 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
1155 GFP_KERNEL);
1156
1157 if (unlikely(!i))
1158 return NULL;
1159
1160 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1161 i->t.target_attrs.ac.class = &fc_transport_class.class;
1162 i->t.target_attrs.ac.match = fc_target_match;
1163 i->t.target_size = sizeof(struct fc_starget_attrs);
1164 transport_container_register(&i->t.target_attrs);
1165
1166 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1167 i->t.host_attrs.ac.class = &fc_host_class.class;
1168 i->t.host_attrs.ac.match = fc_host_match;
1169 i->t.host_size = sizeof(struct fc_host_attrs);
1170 if (ft->get_fc_host_stats)
1171 i->t.host_attrs.statistics = &fc_statistics_group;
1172 transport_container_register(&i->t.host_attrs);
1173
1174 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1175 i->rport_attr_cont.ac.class = &fc_rport_class.class;
1176 i->rport_attr_cont.ac.match = fc_rport_match;
1177 transport_container_register(&i->rport_attr_cont);
1178
1179 i->f = ft;
1180
1181 /* Transport uses the shost workq for scsi scanning */
1182 i->t.create_work_queue = 1;
1183
1184 i->t.eh_timed_out = fc_timed_out;
1185
1186 i->t.user_scan = fc_user_scan;
1187
1188 /*
1189 * Setup SCSI Target Attributes.
1190 */
1191 count = 0;
1192 SETUP_STARGET_ATTRIBUTE_RD(node_name);
1193 SETUP_STARGET_ATTRIBUTE_RD(port_name);
1194 SETUP_STARGET_ATTRIBUTE_RD(port_id);
1195
1196 BUG_ON(count > FC_STARGET_NUM_ATTRS);
1197
1198 i->starget_attrs[count] = NULL;
1199
1200
1201 /*
1202 * Setup SCSI Host Attributes.
1203 */
1204 count=0;
1205 SETUP_HOST_ATTRIBUTE_RD(node_name);
1206 SETUP_HOST_ATTRIBUTE_RD(port_name);
1207 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
1208 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1209 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1210 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1211 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1212 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1213 SETUP_HOST_ATTRIBUTE_RD(serial_number);
1214
1215 SETUP_HOST_ATTRIBUTE_RD(port_id);
1216 SETUP_HOST_ATTRIBUTE_RD(port_type);
1217 SETUP_HOST_ATTRIBUTE_RD(port_state);
1218 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1219 SETUP_HOST_ATTRIBUTE_RD(speed);
1220 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1221
1222 /* Transport-managed attributes */
1223 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1224 if (ft->issue_fc_host_lip)
1225 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
1226
1227 BUG_ON(count > FC_HOST_NUM_ATTRS);
1228
1229 i->host_attrs[count] = NULL;
1230
1231 /*
1232 * Setup Remote Port Attributes.
1233 */
1234 count=0;
1235 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1236 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1237 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1238 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1239 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1240 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1241 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1242 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1243 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1244
1245 BUG_ON(count > FC_RPORT_NUM_ATTRS);
1246
1247 i->rport_attrs[count] = NULL;
1248
1249 return &i->t;
1250 }
1251 EXPORT_SYMBOL(fc_attach_transport);
1252
1253 void fc_release_transport(struct scsi_transport_template *t)
1254 {
1255 struct fc_internal *i = to_fc_internal(t);
1256
1257 transport_container_unregister(&i->t.target_attrs);
1258 transport_container_unregister(&i->t.host_attrs);
1259 transport_container_unregister(&i->rport_attr_cont);
1260
1261 kfree(i);
1262 }
1263 EXPORT_SYMBOL(fc_release_transport);
1264
1265
1266 /**
1267 * fc_remove_host - called to terminate any fc_transport-related elements
1268 * for a scsi host.
1269 * @rport: remote port to be unblocked.
1270 *
1271 * This routine is expected to be called immediately preceeding the
1272 * a driver's call to scsi_remove_host().
1273 *
1274 * WARNING: A driver utilizing the fc_transport, which fails to call
1275 * this routine prior to scsi_remote_host(), will leave dangling
1276 * objects in /sys/class/fc_remote_ports. Access to any of these
1277 * objects can result in a system crash !!!
1278 *
1279 * Notes:
1280 * This routine assumes no locks are held on entry.
1281 **/
1282 void
1283 fc_remove_host(struct Scsi_Host *shost)
1284 {
1285 struct fc_rport *rport, *next_rport;
1286
1287 /* Remove any remote ports */
1288 list_for_each_entry_safe(rport, next_rport,
1289 &fc_host_rports(shost), peers)
1290 fc_rport_terminate(rport);
1291 list_for_each_entry_safe(rport, next_rport,
1292 &fc_host_rport_bindings(shost), peers)
1293 fc_rport_terminate(rport);
1294 }
1295 EXPORT_SYMBOL(fc_remove_host);
1296
1297 /*
1298 * fc_rport_tgt_remove - Removes the scsi target on the remote port
1299 * @rport: The remote port to be operated on
1300 */
1301 static void
1302 fc_rport_tgt_remove(struct fc_rport *rport)
1303 {
1304 struct Scsi_Host *shost = rport_to_shost(rport);
1305
1306 scsi_target_unblock(&rport->dev);
1307
1308 /* Stop anything on the workq */
1309 if (!cancel_delayed_work(&rport->dev_loss_work))
1310 flush_scheduled_work();
1311 scsi_flush_work(shost);
1312
1313 scsi_remove_target(&rport->dev);
1314 }
1315
1316 /**
1317 * fc_rport_create - allocates and creates a remote FC port.
1318 * @shost: scsi host the remote port is connected to.
1319 * @channel: Channel on shost port connected to.
1320 * @ids: The world wide names, fc address, and FC4 port
1321 * roles for the remote port.
1322 *
1323 * Allocates and creates the remoter port structure, including the
1324 * class and sysfs creation.
1325 *
1326 * Notes:
1327 * This routine assumes no locks are held on entry.
1328 **/
1329 struct fc_rport *
1330 fc_rport_create(struct Scsi_Host *shost, int channel,
1331 struct fc_rport_identifiers *ids)
1332 {
1333 struct fc_host_attrs *fc_host =
1334 (struct fc_host_attrs *)shost->shost_data;
1335 struct fc_internal *fci = to_fc_internal(shost->transportt);
1336 struct fc_rport *rport;
1337 struct device *dev;
1338 unsigned long flags;
1339 int error;
1340 size_t size;
1341
1342 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1343 rport = kzalloc(size, GFP_KERNEL);
1344 if (unlikely(!rport)) {
1345 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1346 return NULL;
1347 }
1348
1349 rport->maxframe_size = -1;
1350 rport->supported_classes = FC_COS_UNSPECIFIED;
1351 rport->dev_loss_tmo = fc_dev_loss_tmo;
1352 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1353 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1354 rport->port_id = ids->port_id;
1355 rport->roles = ids->roles;
1356 rport->port_state = FC_PORTSTATE_ONLINE;
1357 if (fci->f->dd_fcrport_size)
1358 rport->dd_data = &rport[1];
1359 rport->channel = channel;
1360
1361 INIT_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport, rport);
1362 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1363
1364 spin_lock_irqsave(shost->host_lock, flags);
1365
1366 rport->number = fc_host->next_rport_number++;
1367 if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1368 rport->scsi_target_id = fc_host->next_target_id++;
1369 else
1370 rport->scsi_target_id = -1;
1371 list_add_tail(&rport->peers, &fc_host_rports(shost));
1372 get_device(&shost->shost_gendev);
1373
1374 spin_unlock_irqrestore(shost->host_lock, flags);
1375
1376 dev = &rport->dev;
1377 device_initialize(dev);
1378 dev->parent = get_device(&shost->shost_gendev);
1379 dev->release = fc_rport_dev_release;
1380 sprintf(dev->bus_id, "rport-%d:%d-%d",
1381 shost->host_no, channel, rport->number);
1382 transport_setup_device(dev);
1383
1384 error = device_add(dev);
1385 if (error) {
1386 printk(KERN_ERR "FC Remote Port device_add failed\n");
1387 goto delete_rport;
1388 }
1389 transport_add_device(dev);
1390 transport_configure_device(dev);
1391
1392 if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1393 /* initiate a scan of the target */
1394 scsi_queue_work(shost, &rport->scan_work);
1395
1396 return rport;
1397
1398 delete_rport:
1399 transport_destroy_device(dev);
1400 put_device(dev->parent);
1401 spin_lock_irqsave(shost->host_lock, flags);
1402 list_del(&rport->peers);
1403 put_device(&shost->shost_gendev);
1404 spin_unlock_irqrestore(shost->host_lock, flags);
1405 put_device(dev->parent);
1406 kfree(rport);
1407 return NULL;
1408 }
1409
1410 /**
1411 * fc_remote_port_add - notifies the fc transport of the existence
1412 * of a remote FC port.
1413 * @shost: scsi host the remote port is connected to.
1414 * @channel: Channel on shost port connected to.
1415 * @ids: The world wide names, fc address, and FC4 port
1416 * roles for the remote port.
1417 *
1418 * The LLDD calls this routine to notify the transport of the existence
1419 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1420 * of the port, it's FC address (port_id), and the FC4 roles that are
1421 * active for the port.
1422 *
1423 * For ports that are FCP targets (aka scsi targets), the FC transport
1424 * maintains consistent target id bindings on behalf of the LLDD.
1425 * A consistent target id binding is an assignment of a target id to
1426 * a remote port identifier, which persists while the scsi host is
1427 * attached. The remote port can disappear, then later reappear, and
1428 * it's target id assignment remains the same. This allows for shifts
1429 * in FC addressing (if binding by wwpn or wwnn) with no apparent
1430 * changes to the scsi subsystem which is based on scsi host number and
1431 * target id values. Bindings are only valid during the attachment of
1432 * the scsi host. If the host detaches, then later re-attaches, target
1433 * id bindings may change.
1434 *
1435 * This routine is responsible for returning a remote port structure.
1436 * The routine will search the list of remote ports it maintains
1437 * internally on behalf of consistent target id mappings. If found, the
1438 * remote port structure will be reused. Otherwise, a new remote port
1439 * structure will be allocated.
1440 *
1441 * Whenever a remote port is allocated, a new fc_remote_port class
1442 * device is created.
1443 *
1444 * Should not be called from interrupt context.
1445 *
1446 * Notes:
1447 * This routine assumes no locks are held on entry.
1448 **/
1449 struct fc_rport *
1450 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1451 struct fc_rport_identifiers *ids)
1452 {
1453 struct fc_internal *fci = to_fc_internal(shost->transportt);
1454 struct fc_rport *rport;
1455 unsigned long flags;
1456 int match = 0;
1457
1458 /*
1459 * Search the list of "active" rports, for an rport that has been
1460 * deleted, but we've held off the real delete while the target
1461 * is in a "blocked" state.
1462 */
1463 spin_lock_irqsave(shost->host_lock, flags);
1464
1465 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1466
1467 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
1468 (rport->channel == channel)) {
1469
1470 switch (fc_host_tgtid_bind_type(shost)) {
1471 case FC_TGTID_BIND_BY_WWPN:
1472 case FC_TGTID_BIND_NONE:
1473 if (rport->port_name == ids->port_name)
1474 match = 1;
1475 break;
1476 case FC_TGTID_BIND_BY_WWNN:
1477 if (rport->node_name == ids->node_name)
1478 match = 1;
1479 break;
1480 case FC_TGTID_BIND_BY_ID:
1481 if (rport->port_id == ids->port_id)
1482 match = 1;
1483 break;
1484 }
1485
1486 if (match) {
1487 struct work_struct *work =
1488 &rport->dev_loss_work;
1489
1490 memcpy(&rport->node_name, &ids->node_name,
1491 sizeof(rport->node_name));
1492 memcpy(&rport->port_name, &ids->port_name,
1493 sizeof(rport->port_name));
1494 rport->port_id = ids->port_id;
1495
1496 rport->port_state = FC_PORTSTATE_ONLINE;
1497 rport->roles = ids->roles;
1498
1499 spin_unlock_irqrestore(shost->host_lock, flags);
1500
1501 if (fci->f->dd_fcrport_size)
1502 memset(rport->dd_data, 0,
1503 fci->f->dd_fcrport_size);
1504
1505 /*
1506 * If we were blocked, we were a target.
1507 * If no longer a target, we leave the timer
1508 * running in case the port changes roles
1509 * prior to the timer expiring. If the timer
1510 * fires, the target will be torn down.
1511 */
1512 if (!(ids->roles & FC_RPORT_ROLE_FCP_TARGET))
1513 return rport;
1514
1515 /* restart the target */
1516
1517 /*
1518 * Stop the target timer first. Take no action
1519 * on the del_timer failure as the state
1520 * machine state change will validate the
1521 * transaction.
1522 */
1523 if (!cancel_delayed_work(work))
1524 flush_scheduled_work();
1525
1526 /* initiate a scan of the target */
1527 scsi_queue_work(shost, &rport->scan_work);
1528
1529 return rport;
1530 }
1531 }
1532 }
1533
1534 /* Search the bindings array */
1535 if (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE) {
1536
1537 /* search for a matching consistent binding */
1538
1539 list_for_each_entry(rport, &fc_host_rport_bindings(shost),
1540 peers) {
1541 if (rport->channel != channel)
1542 continue;
1543
1544 switch (fc_host_tgtid_bind_type(shost)) {
1545 case FC_TGTID_BIND_BY_WWPN:
1546 if (rport->port_name == ids->port_name)
1547 match = 1;
1548 break;
1549 case FC_TGTID_BIND_BY_WWNN:
1550 if (rport->node_name == ids->node_name)
1551 match = 1;
1552 break;
1553 case FC_TGTID_BIND_BY_ID:
1554 if (rport->port_id == ids->port_id)
1555 match = 1;
1556 break;
1557 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1558 break;
1559 }
1560
1561 if (match) {
1562 list_move_tail(&rport->peers,
1563 &fc_host_rports(shost));
1564 break;
1565 }
1566 }
1567
1568 if (match) {
1569 memcpy(&rport->node_name, &ids->node_name,
1570 sizeof(rport->node_name));
1571 memcpy(&rport->port_name, &ids->port_name,
1572 sizeof(rport->port_name));
1573 rport->port_id = ids->port_id;
1574 rport->roles = ids->roles;
1575 rport->port_state = FC_PORTSTATE_ONLINE;
1576
1577 spin_unlock_irqrestore(shost->host_lock, flags);
1578
1579 if (fci->f->dd_fcrport_size)
1580 memset(rport->dd_data, 0,
1581 fci->f->dd_fcrport_size);
1582
1583 if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1584 /* initiate a scan of the target */
1585 scsi_queue_work(shost, &rport->scan_work);
1586
1587 return rport;
1588 }
1589 }
1590
1591 spin_unlock_irqrestore(shost->host_lock, flags);
1592
1593 /* No consistent binding found - create new remote port entry */
1594 rport = fc_rport_create(shost, channel, ids);
1595
1596 return rport;
1597 }
1598 EXPORT_SYMBOL(fc_remote_port_add);
1599
1600 /*
1601 * fc_rport_terminate - this routine tears down and deallocates a remote port.
1602 * @rport: The remote port to be terminated
1603 *
1604 * Notes:
1605 * This routine assumes no locks are held on entry.
1606 */
1607 static void
1608 fc_rport_terminate(struct fc_rport *rport)
1609 {
1610 struct Scsi_Host *shost = rport_to_shost(rport);
1611 struct device *dev = &rport->dev;
1612 unsigned long flags;
1613
1614 fc_rport_tgt_remove(rport);
1615
1616 transport_remove_device(dev);
1617 device_del(dev);
1618 transport_destroy_device(dev);
1619 spin_lock_irqsave(shost->host_lock, flags);
1620 list_del(&rport->peers);
1621 spin_unlock_irqrestore(shost->host_lock, flags);
1622 put_device(&shost->shost_gendev);
1623 }
1624
1625 /**
1626 * fc_remote_port_delete - notifies the fc transport that a remote
1627 * port is no longer in existence.
1628 * @rport: The remote port that no longer exists
1629 *
1630 * The LLDD calls this routine to notify the transport that a remote
1631 * port is no longer part of the topology. Note: Although a port
1632 * may no longer be part of the topology, it may persist in the remote
1633 * ports displayed by the fc_host. We do this under 2 conditions:
1634 * - If the port was a scsi target, we delay its deletion by "blocking" it.
1635 * This allows the port to temporarily disappear, then reappear without
1636 * disrupting the SCSI device tree attached to it. During the "blocked"
1637 * period the port will still exist.
1638 * - If the port was a scsi target and disappears for longer than we
1639 * expect, we'll delete the port and the tear down the SCSI device tree
1640 * attached to it. However, we want to semi-persist the target id assigned
1641 * to that port if it eventually does exist. The port structure will
1642 * remain (although with minimal information) so that the target id
1643 * bindings remails.
1644 *
1645 * If the remote port is not an FCP Target, it will be fully torn down
1646 * and deallocated, including the fc_remote_port class device.
1647 *
1648 * If the remote port is an FCP Target, the port will be placed in a
1649 * temporary blocked state. From the LLDD's perspective, the rport no
1650 * longer exists. From the SCSI midlayer's perspective, the SCSI target
1651 * exists, but all sdevs on it are blocked from further I/O. The following
1652 * is then expected:
1653 * If the remote port does not return (signaled by a LLDD call to
1654 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
1655 * scsi target is removed - killing all outstanding i/o and removing the
1656 * scsi devices attached ot it. The port structure will be marked Not
1657 * Present and be partially cleared, leaving only enough information to
1658 * recognize the remote port relative to the scsi target id binding if
1659 * it later appears. The port will remain as long as there is a valid
1660 * binding (e.g. until the user changes the binding type or unloads the
1661 * scsi host with the binding).
1662 *
1663 * If the remote port returns within the dev_loss_tmo value (and matches
1664 * according to the target id binding type), the port structure will be
1665 * reused. If it is no longer a SCSI target, the target will be torn
1666 * down. If it continues to be a SCSI target, then the target will be
1667 * unblocked (allowing i/o to be resumed), and a scan will be activated
1668 * to ensure that all luns are detected.
1669 *
1670 * Called from normal process context only - cannot be called from interrupt.
1671 *
1672 * Notes:
1673 * This routine assumes no locks are held on entry.
1674 **/
1675 void
1676 fc_remote_port_delete(struct fc_rport *rport)
1677 {
1678 int timeout = rport->dev_loss_tmo;
1679
1680 /* If no scsi target id mapping, delete it */
1681 if (rport->scsi_target_id == -1) {
1682 fc_rport_terminate(rport);
1683 return;
1684 }
1685
1686 scsi_target_block(&rport->dev);
1687
1688 /* cap the length the devices can be blocked until they are deleted */
1689 schedule_delayed_work(&rport->dev_loss_work, timeout * HZ);
1690
1691 rport->port_state = FC_PORTSTATE_BLOCKED;
1692 }
1693 EXPORT_SYMBOL(fc_remote_port_delete);
1694
1695 /**
1696 * fc_remote_port_rolechg - notifies the fc transport that the roles
1697 * on a remote may have changed.
1698 * @rport: The remote port that changed.
1699 *
1700 * The LLDD calls this routine to notify the transport that the roles
1701 * on a remote port may have changed. The largest effect of this is
1702 * if a port now becomes a FCP Target, it must be allocated a
1703 * scsi target id. If the port is no longer a FCP target, any
1704 * scsi target id value assigned to it will persist in case the
1705 * role changes back to include FCP Target. No changes in the scsi
1706 * midlayer will be invoked if the role changes (in the expectation
1707 * that the role will be resumed. If it doesn't normal error processing
1708 * will take place).
1709 *
1710 * Should not be called from interrupt context.
1711 *
1712 * Notes:
1713 * This routine assumes no locks are held on entry.
1714 **/
1715 void
1716 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
1717 {
1718 struct Scsi_Host *shost = rport_to_shost(rport);
1719 struct fc_host_attrs *fc_host =
1720 (struct fc_host_attrs *)shost->shost_data;
1721 unsigned long flags;
1722 int create = 0;
1723
1724 spin_lock_irqsave(shost->host_lock, flags);
1725 if (roles & FC_RPORT_ROLE_FCP_TARGET) {
1726 if (rport->scsi_target_id == -1) {
1727 rport->scsi_target_id = fc_host->next_target_id++;
1728 create = 1;
1729 } else if (!(rport->roles & FC_RPORT_ROLE_FCP_TARGET))
1730 create = 1;
1731 }
1732 spin_unlock_irqrestore(shost->host_lock, flags);
1733
1734 rport->roles = roles;
1735
1736 if (create) {
1737 /*
1738 * There may have been a delete timer running on the
1739 * port. Ensure that it is cancelled as we now know
1740 * the port is an FCP Target.
1741 * Note: we know the rport is exists and in an online
1742 * state as the LLDD would not have had an rport
1743 * reference to pass us.
1744 *
1745 * Take no action on the del_timer failure as the state
1746 * machine state change will validate the
1747 * transaction.
1748 */
1749 if (!cancel_delayed_work(&rport->dev_loss_work))
1750 flush_scheduled_work();
1751
1752 /* initiate a scan of the target */
1753 scsi_queue_work(shost, &rport->scan_work);
1754 }
1755 }
1756 EXPORT_SYMBOL(fc_remote_port_rolechg);
1757
1758 /**
1759 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port that
1760 * was a SCSI target (thus was blocked), and failed
1761 * to return in the alloted time.
1762 *
1763 * @data: rport target that failed to reappear in the alloted time.
1764 **/
1765 static void
1766 fc_timeout_deleted_rport(void *data)
1767 {
1768 struct fc_rport *rport = (struct fc_rport *)data;
1769 struct Scsi_Host *shost = rport_to_shost(rport);
1770 unsigned long flags;
1771
1772 spin_lock_irqsave(shost->host_lock, flags);
1773
1774 /*
1775 * If the port is ONLINE, then it came back, but was no longer an
1776 * FCP target. Thus we need to tear down the scsi_target on it.
1777 */
1778 if (rport->port_state == FC_PORTSTATE_ONLINE) {
1779 spin_unlock_irqrestore(shost->host_lock, flags);
1780
1781 dev_printk(KERN_ERR, &rport->dev,
1782 "blocked FC remote port time out: removing target\n");
1783
1784 fc_rport_tgt_remove(rport);
1785
1786 return;
1787 }
1788
1789 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
1790 spin_unlock_irqrestore(shost->host_lock, flags);
1791 dev_printk(KERN_ERR, &rport->dev,
1792 "blocked FC remote port time out: leaving target alone\n");
1793 return;
1794 }
1795
1796 if (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE) {
1797 spin_unlock_irqrestore(shost->host_lock, flags);
1798 dev_printk(KERN_ERR, &rport->dev,
1799 "blocked FC remote port time out: removing target\n");
1800 fc_rport_terminate(rport);
1801 return;
1802 }
1803
1804 dev_printk(KERN_ERR, &rport->dev,
1805 "blocked FC remote port time out: removing target and "
1806 "saving binding\n");
1807
1808 list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
1809
1810 /*
1811 * Note: We do not remove or clear the hostdata area. This allows
1812 * host-specific target data to persist along with the
1813 * scsi_target_id. It's up to the host to manage it's hostdata area.
1814 */
1815
1816 /*
1817 * Reinitialize port attributes that may change if the port comes back.
1818 */
1819 rport->maxframe_size = -1;
1820 rport->supported_classes = FC_COS_UNSPECIFIED;
1821 rport->roles = FC_RPORT_ROLE_UNKNOWN;
1822 rport->port_state = FC_PORTSTATE_DELETED;
1823
1824 /* remove the identifiers that aren't used in the consisting binding */
1825 switch (fc_host_tgtid_bind_type(shost)) {
1826 case FC_TGTID_BIND_BY_WWPN:
1827 rport->node_name = -1;
1828 rport->port_id = -1;
1829 break;
1830 case FC_TGTID_BIND_BY_WWNN:
1831 rport->port_name = -1;
1832 rport->port_id = -1;
1833 break;
1834 case FC_TGTID_BIND_BY_ID:
1835 rport->node_name = -1;
1836 rport->port_name = -1;
1837 break;
1838 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1839 break;
1840 }
1841
1842 /*
1843 * As this only occurs if the remote port (scsi target)
1844 * went away and didn't come back - we'll remove
1845 * all attached scsi devices.
1846 *
1847 * We'll schedule the shost work item to perform the actual removal
1848 * to avoid recursion in the different flush calls if we perform
1849 * the removal in each target - and there are lots of targets
1850 * whose timeouts fire at the same time.
1851 */
1852
1853 if ( !(fc_host_flags(shost) & FC_SHOST_RPORT_DEL_SCHEDULED)) {
1854 fc_host_flags(shost) |= FC_SHOST_RPORT_DEL_SCHEDULED;
1855 scsi_queue_work(shost, &fc_host_rport_del_work(shost));
1856 }
1857
1858 spin_unlock_irqrestore(shost->host_lock, flags);
1859 }
1860
1861 /**
1862 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
1863 *
1864 * Will unblock the target (in case it went away and has now come back),
1865 * then invoke a scan.
1866 *
1867 * @data: remote port to be scanned.
1868 **/
1869 static void
1870 fc_scsi_scan_rport(void *data)
1871 {
1872 struct fc_rport *rport = (struct fc_rport *)data;
1873
1874 scsi_target_unblock(&rport->dev);
1875 scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
1876 SCAN_WILD_CARD, 1);
1877 }
1878
1879
1880 /**
1881 * fc_shost_remove_rports - called to remove all rports that are marked
1882 * as in a deleted (not connected) state.
1883 *
1884 * @data: shost whose rports are to be looked at
1885 **/
1886 static void
1887 fc_shost_remove_rports(void *data)
1888 {
1889 struct Scsi_Host *shost = (struct Scsi_Host *)data;
1890 struct fc_rport *rport, *next_rport;
1891 unsigned long flags;
1892
1893 spin_lock_irqsave(shost->host_lock, flags);
1894 while (fc_host_flags(shost) & FC_SHOST_RPORT_DEL_SCHEDULED) {
1895
1896 fc_host_flags(shost) &= ~FC_SHOST_RPORT_DEL_SCHEDULED;
1897
1898 restart_search:
1899 list_for_each_entry_safe(rport, next_rport,
1900 &fc_host_rport_bindings(shost), peers) {
1901 if (rport->port_state == FC_PORTSTATE_DELETED) {
1902 rport->port_state = FC_PORTSTATE_NOTPRESENT;
1903 spin_unlock_irqrestore(shost->host_lock, flags);
1904 fc_rport_tgt_remove(rport);
1905 spin_lock_irqsave(shost->host_lock, flags);
1906 goto restart_search;
1907 }
1908 }
1909
1910 }
1911 spin_unlock_irqrestore(shost->host_lock, flags);
1912 }
1913
1914
1915 MODULE_AUTHOR("Martin Hicks");
1916 MODULE_DESCRIPTION("FC Transport Attributes");
1917 MODULE_LICENSE("GPL");
1918
1919 module_init(fc_transport_init);
1920 module_exit(fc_transport_exit);
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