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Merge tag 'v3.10.67' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / scsi_transport_fc.c
1 /*
2 * FiberChannel transport specific attributes exported to sysfs.
3 *
4 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 *
20 * ========
21 *
22 * Copyright (C) 2004-2007 James Smart, Emulex Corporation
23 * Rewrite for host, target, device, and remote port attributes,
24 * statistics, and service functions...
25 * Add vports, etc
26 *
27 */
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/slab.h>
31 #include <linux/delay.h>
32 #include <linux/kernel.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_fc.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <net/netlink.h>
39 #include <scsi/scsi_netlink_fc.h>
40 #include <scsi/scsi_bsg_fc.h>
41 #include "scsi_priv.h"
42 #include "scsi_transport_fc_internal.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_NOT_NEGOTIATED, "Not Negotiated" },
265 };
266 fc_bitfield_name_search(port_speed, fc_port_speed_names)
267
268
269 static int
270 show_fc_fc4s (char *buf, u8 *fc4_list)
271 {
272 int i, len=0;
273
274 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
275 len += sprintf(buf + len , "0x%02x ", *fc4_list);
276 len += sprintf(buf + len, "\n");
277 return len;
278 }
279
280
281 /* Convert FC_PORT_ROLE bit values to ascii string name */
282 static const struct {
283 u32 value;
284 char *name;
285 } fc_port_role_names[] = {
286 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
287 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
288 { FC_PORT_ROLE_IP_PORT, "IP Port" },
289 };
290 fc_bitfield_name_search(port_roles, fc_port_role_names)
291
292 /*
293 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
294 */
295 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
296 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
297 #define FC_FPORT_PORTID 0x00000e
298 #define FC_FABCTLR_PORTID 0x00000d
299 #define FC_DIRSRVR_PORTID 0x00000c
300 #define FC_TIMESRVR_PORTID 0x00000b
301 #define FC_MGMTSRVR_PORTID 0x00000a
302
303
304 static void fc_timeout_deleted_rport(struct work_struct *work);
305 static void fc_timeout_fail_rport_io(struct work_struct *work);
306 static void fc_scsi_scan_rport(struct work_struct *work);
307
308 /*
309 * Attribute counts pre object type...
310 * Increase these values if you add attributes
311 */
312 #define FC_STARGET_NUM_ATTRS 3
313 #define FC_RPORT_NUM_ATTRS 10
314 #define FC_VPORT_NUM_ATTRS 9
315 #define FC_HOST_NUM_ATTRS 29
316
317 struct fc_internal {
318 struct scsi_transport_template t;
319 struct fc_function_template *f;
320
321 /*
322 * For attributes : each object has :
323 * An array of the actual attributes structures
324 * An array of null-terminated pointers to the attribute
325 * structures - used for mid-layer interaction.
326 *
327 * The attribute containers for the starget and host are are
328 * part of the midlayer. As the remote port is specific to the
329 * fc transport, we must provide the attribute container.
330 */
331 struct device_attribute private_starget_attrs[
332 FC_STARGET_NUM_ATTRS];
333 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
334
335 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
336 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
337
338 struct transport_container rport_attr_cont;
339 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
340 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
341
342 struct transport_container vport_attr_cont;
343 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
344 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
345 };
346
347 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
348
349 static int fc_target_setup(struct transport_container *tc, struct device *dev,
350 struct device *cdev)
351 {
352 struct scsi_target *starget = to_scsi_target(dev);
353 struct fc_rport *rport = starget_to_rport(starget);
354
355 /*
356 * if parent is remote port, use values from remote port.
357 * Otherwise, this host uses the fc_transport, but not the
358 * remote port interface. As such, initialize to known non-values.
359 */
360 if (rport) {
361 fc_starget_node_name(starget) = rport->node_name;
362 fc_starget_port_name(starget) = rport->port_name;
363 fc_starget_port_id(starget) = rport->port_id;
364 } else {
365 fc_starget_node_name(starget) = -1;
366 fc_starget_port_name(starget) = -1;
367 fc_starget_port_id(starget) = -1;
368 }
369
370 return 0;
371 }
372
373 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
374 "fc_transport",
375 fc_target_setup,
376 NULL,
377 NULL);
378
379 static int fc_host_setup(struct transport_container *tc, struct device *dev,
380 struct device *cdev)
381 {
382 struct Scsi_Host *shost = dev_to_shost(dev);
383 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
384
385 /*
386 * Set default values easily detected by the midlayer as
387 * failure cases. The scsi lldd is responsible for initializing
388 * all transport attributes to valid values per host.
389 */
390 fc_host->node_name = -1;
391 fc_host->port_name = -1;
392 fc_host->permanent_port_name = -1;
393 fc_host->supported_classes = FC_COS_UNSPECIFIED;
394 memset(fc_host->supported_fc4s, 0,
395 sizeof(fc_host->supported_fc4s));
396 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
397 fc_host->maxframe_size = -1;
398 fc_host->max_npiv_vports = 0;
399 memset(fc_host->serial_number, 0,
400 sizeof(fc_host->serial_number));
401 memset(fc_host->manufacturer, 0,
402 sizeof(fc_host->manufacturer));
403 memset(fc_host->model, 0,
404 sizeof(fc_host->model));
405 memset(fc_host->model_description, 0,
406 sizeof(fc_host->model_description));
407 memset(fc_host->hardware_version, 0,
408 sizeof(fc_host->hardware_version));
409 memset(fc_host->driver_version, 0,
410 sizeof(fc_host->driver_version));
411 memset(fc_host->firmware_version, 0,
412 sizeof(fc_host->firmware_version));
413 memset(fc_host->optionrom_version, 0,
414 sizeof(fc_host->optionrom_version));
415
416 fc_host->port_id = -1;
417 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
418 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
419 memset(fc_host->active_fc4s, 0,
420 sizeof(fc_host->active_fc4s));
421 fc_host->speed = FC_PORTSPEED_UNKNOWN;
422 fc_host->fabric_name = -1;
423 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
424 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
425
426 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
427
428 INIT_LIST_HEAD(&fc_host->rports);
429 INIT_LIST_HEAD(&fc_host->rport_bindings);
430 INIT_LIST_HEAD(&fc_host->vports);
431 fc_host->next_rport_number = 0;
432 fc_host->next_target_id = 0;
433 fc_host->next_vport_number = 0;
434 fc_host->npiv_vports_inuse = 0;
435
436 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
437 "fc_wq_%d", shost->host_no);
438 fc_host->work_q = alloc_workqueue(fc_host->work_q_name, 0, 0);
439 if (!fc_host->work_q)
440 return -ENOMEM;
441
442 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
443 snprintf(fc_host->devloss_work_q_name,
444 sizeof(fc_host->devloss_work_q_name),
445 "fc_dl_%d", shost->host_no);
446 fc_host->devloss_work_q =
447 alloc_workqueue(fc_host->devloss_work_q_name, 0, 0);
448 if (!fc_host->devloss_work_q) {
449 destroy_workqueue(fc_host->work_q);
450 fc_host->work_q = NULL;
451 return -ENOMEM;
452 }
453
454 fc_bsg_hostadd(shost, fc_host);
455 /* ignore any bsg add error - we just can't do sgio */
456
457 return 0;
458 }
459
460 static int fc_host_remove(struct transport_container *tc, struct device *dev,
461 struct device *cdev)
462 {
463 struct Scsi_Host *shost = dev_to_shost(dev);
464 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
465
466 fc_bsg_remove(fc_host->rqst_q);
467 return 0;
468 }
469
470 static DECLARE_TRANSPORT_CLASS(fc_host_class,
471 "fc_host",
472 fc_host_setup,
473 fc_host_remove,
474 NULL);
475
476 /*
477 * Setup and Remove actions for remote ports are handled
478 * in the service functions below.
479 */
480 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
481 "fc_remote_ports",
482 NULL,
483 NULL,
484 NULL);
485
486 /*
487 * Setup and Remove actions for virtual ports are handled
488 * in the service functions below.
489 */
490 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
491 "fc_vports",
492 NULL,
493 NULL,
494 NULL);
495
496 /*
497 * Netlink Infrastructure
498 */
499
500 static atomic_t fc_event_seq;
501
502 /**
503 * fc_get_event_number - Obtain the next sequential FC event number
504 *
505 * Notes:
506 * We could have inlined this, but it would have required fc_event_seq to
507 * be exposed. For now, live with the subroutine call.
508 * Atomic used to avoid lock/unlock...
509 */
510 u32
511 fc_get_event_number(void)
512 {
513 return atomic_add_return(1, &fc_event_seq);
514 }
515 EXPORT_SYMBOL(fc_get_event_number);
516
517
518 /**
519 * fc_host_post_event - called to post an even on an fc_host.
520 * @shost: host the event occurred on
521 * @event_number: fc event number obtained from get_fc_event_number()
522 * @event_code: fc_host event being posted
523 * @event_data: 32bits of data for the event being posted
524 *
525 * Notes:
526 * This routine assumes no locks are held on entry.
527 */
528 void
529 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
530 enum fc_host_event_code event_code, u32 event_data)
531 {
532 struct sk_buff *skb;
533 struct nlmsghdr *nlh;
534 struct fc_nl_event *event;
535 const char *name;
536 u32 len;
537 int err;
538
539 if (!scsi_nl_sock) {
540 err = -ENOENT;
541 goto send_fail;
542 }
543
544 len = FC_NL_MSGALIGN(sizeof(*event));
545
546 skb = nlmsg_new(len, GFP_KERNEL);
547 if (!skb) {
548 err = -ENOBUFS;
549 goto send_fail;
550 }
551
552 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
553 if (!nlh) {
554 err = -ENOBUFS;
555 goto send_fail_skb;
556 }
557 event = nlmsg_data(nlh);
558
559 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
560 FC_NL_ASYNC_EVENT, len);
561 event->seconds = get_seconds();
562 event->vendor_id = 0;
563 event->host_no = shost->host_no;
564 event->event_datalen = sizeof(u32); /* bytes */
565 event->event_num = event_number;
566 event->event_code = event_code;
567 event->event_data = event_data;
568
569 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
570 GFP_KERNEL);
571 return;
572
573 send_fail_skb:
574 kfree_skb(skb);
575 send_fail:
576 name = get_fc_host_event_code_name(event_code);
577 printk(KERN_WARNING
578 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
579 __func__, shost->host_no,
580 (name) ? name : "<unknown>", event_data, err);
581 return;
582 }
583 EXPORT_SYMBOL(fc_host_post_event);
584
585
586 /**
587 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
588 * @shost: host the event occurred on
589 * @event_number: fc event number obtained from get_fc_event_number()
590 * @data_len: amount, in bytes, of vendor unique data
591 * @data_buf: pointer to vendor unique data
592 * @vendor_id: Vendor id
593 *
594 * Notes:
595 * This routine assumes no locks are held on entry.
596 */
597 void
598 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
599 u32 data_len, char * data_buf, u64 vendor_id)
600 {
601 struct sk_buff *skb;
602 struct nlmsghdr *nlh;
603 struct fc_nl_event *event;
604 u32 len;
605 int err;
606
607 if (!scsi_nl_sock) {
608 err = -ENOENT;
609 goto send_vendor_fail;
610 }
611
612 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
613
614 skb = nlmsg_new(len, GFP_KERNEL);
615 if (!skb) {
616 err = -ENOBUFS;
617 goto send_vendor_fail;
618 }
619
620 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
621 if (!nlh) {
622 err = -ENOBUFS;
623 goto send_vendor_fail_skb;
624 }
625 event = nlmsg_data(nlh);
626
627 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
628 FC_NL_ASYNC_EVENT, len);
629 event->seconds = get_seconds();
630 event->vendor_id = vendor_id;
631 event->host_no = shost->host_no;
632 event->event_datalen = data_len; /* bytes */
633 event->event_num = event_number;
634 event->event_code = FCH_EVT_VENDOR_UNIQUE;
635 memcpy(&event->event_data, data_buf, data_len);
636
637 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
638 GFP_KERNEL);
639 return;
640
641 send_vendor_fail_skb:
642 kfree_skb(skb);
643 send_vendor_fail:
644 printk(KERN_WARNING
645 "%s: Dropped Event : host %d vendor_unique - err %d\n",
646 __func__, shost->host_no, err);
647 return;
648 }
649 EXPORT_SYMBOL(fc_host_post_vendor_event);
650
651
652
653 static __init int fc_transport_init(void)
654 {
655 int error;
656
657 atomic_set(&fc_event_seq, 0);
658
659 error = transport_class_register(&fc_host_class);
660 if (error)
661 return error;
662 error = transport_class_register(&fc_vport_class);
663 if (error)
664 goto unreg_host_class;
665 error = transport_class_register(&fc_rport_class);
666 if (error)
667 goto unreg_vport_class;
668 error = transport_class_register(&fc_transport_class);
669 if (error)
670 goto unreg_rport_class;
671 return 0;
672
673 unreg_rport_class:
674 transport_class_unregister(&fc_rport_class);
675 unreg_vport_class:
676 transport_class_unregister(&fc_vport_class);
677 unreg_host_class:
678 transport_class_unregister(&fc_host_class);
679 return error;
680 }
681
682 static void __exit fc_transport_exit(void)
683 {
684 transport_class_unregister(&fc_transport_class);
685 transport_class_unregister(&fc_rport_class);
686 transport_class_unregister(&fc_host_class);
687 transport_class_unregister(&fc_vport_class);
688 }
689
690 /*
691 * FC Remote Port Attribute Management
692 */
693
694 #define fc_rport_show_function(field, format_string, sz, cast) \
695 static ssize_t \
696 show_fc_rport_##field (struct device *dev, \
697 struct device_attribute *attr, char *buf) \
698 { \
699 struct fc_rport *rport = transport_class_to_rport(dev); \
700 struct Scsi_Host *shost = rport_to_shost(rport); \
701 struct fc_internal *i = to_fc_internal(shost->transportt); \
702 if ((i->f->get_rport_##field) && \
703 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
704 (rport->port_state == FC_PORTSTATE_DELETED) || \
705 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
706 i->f->get_rport_##field(rport); \
707 return snprintf(buf, sz, format_string, cast rport->field); \
708 }
709
710 #define fc_rport_store_function(field) \
711 static ssize_t \
712 store_fc_rport_##field(struct device *dev, \
713 struct device_attribute *attr, \
714 const char *buf, size_t count) \
715 { \
716 int val; \
717 struct fc_rport *rport = transport_class_to_rport(dev); \
718 struct Scsi_Host *shost = rport_to_shost(rport); \
719 struct fc_internal *i = to_fc_internal(shost->transportt); \
720 char *cp; \
721 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
722 (rport->port_state == FC_PORTSTATE_DELETED) || \
723 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
724 return -EBUSY; \
725 val = simple_strtoul(buf, &cp, 0); \
726 if (*cp && (*cp != '\n')) \
727 return -EINVAL; \
728 i->f->set_rport_##field(rport, val); \
729 return count; \
730 }
731
732 #define fc_rport_rd_attr(field, format_string, sz) \
733 fc_rport_show_function(field, format_string, sz, ) \
734 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
735 show_fc_rport_##field, NULL)
736
737 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
738 fc_rport_show_function(field, format_string, sz, (cast)) \
739 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
740 show_fc_rport_##field, NULL)
741
742 #define fc_rport_rw_attr(field, format_string, sz) \
743 fc_rport_show_function(field, format_string, sz, ) \
744 fc_rport_store_function(field) \
745 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
746 show_fc_rport_##field, \
747 store_fc_rport_##field)
748
749
750 #define fc_private_rport_show_function(field, format_string, sz, cast) \
751 static ssize_t \
752 show_fc_rport_##field (struct device *dev, \
753 struct device_attribute *attr, char *buf) \
754 { \
755 struct fc_rport *rport = transport_class_to_rport(dev); \
756 return snprintf(buf, sz, format_string, cast rport->field); \
757 }
758
759 #define fc_private_rport_rd_attr(field, format_string, sz) \
760 fc_private_rport_show_function(field, format_string, sz, ) \
761 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
762 show_fc_rport_##field, NULL)
763
764 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
765 fc_private_rport_show_function(field, format_string, sz, (cast)) \
766 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
767 show_fc_rport_##field, NULL)
768
769
770 #define fc_private_rport_rd_enum_attr(title, maxlen) \
771 static ssize_t \
772 show_fc_rport_##title (struct device *dev, \
773 struct device_attribute *attr, char *buf) \
774 { \
775 struct fc_rport *rport = transport_class_to_rport(dev); \
776 const char *name; \
777 name = get_fc_##title##_name(rport->title); \
778 if (!name) \
779 return -EINVAL; \
780 return snprintf(buf, maxlen, "%s\n", name); \
781 } \
782 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
783 show_fc_rport_##title, NULL)
784
785
786 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
787 i->private_rport_attrs[count] = device_attr_rport_##field; \
788 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
789 i->private_rport_attrs[count].store = NULL; \
790 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
791 if (i->f->show_rport_##field) \
792 count++
793
794 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
795 i->private_rport_attrs[count] = device_attr_rport_##field; \
796 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
797 i->private_rport_attrs[count].store = NULL; \
798 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
799 count++
800
801 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
802 i->private_rport_attrs[count] = device_attr_rport_##field; \
803 if (!i->f->set_rport_##field) { \
804 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
805 i->private_rport_attrs[count].store = NULL; \
806 } \
807 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
808 if (i->f->show_rport_##field) \
809 count++
810
811 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
812 { \
813 i->private_rport_attrs[count] = device_attr_rport_##field; \
814 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
815 count++; \
816 }
817
818
819 /* The FC Transport Remote Port Attributes: */
820
821 /* Fixed Remote Port Attributes */
822
823 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
824
825 static ssize_t
826 show_fc_rport_supported_classes (struct device *dev,
827 struct device_attribute *attr, char *buf)
828 {
829 struct fc_rport *rport = transport_class_to_rport(dev);
830 if (rport->supported_classes == FC_COS_UNSPECIFIED)
831 return snprintf(buf, 20, "unspecified\n");
832 return get_fc_cos_names(rport->supported_classes, buf);
833 }
834 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
835 show_fc_rport_supported_classes, NULL);
836
837 /* Dynamic Remote Port Attributes */
838
839 /*
840 * dev_loss_tmo attribute
841 */
842 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
843 {
844 char *cp;
845
846 *val = simple_strtoul(buf, &cp, 0);
847 if ((*cp && (*cp != '\n')) || (*val < 0))
848 return -EINVAL;
849 /*
850 * Check for overflow; dev_loss_tmo is u32
851 */
852 if (*val > UINT_MAX)
853 return -EINVAL;
854
855 return 0;
856 }
857
858 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
859 unsigned long val)
860 {
861 struct Scsi_Host *shost = rport_to_shost(rport);
862 struct fc_internal *i = to_fc_internal(shost->transportt);
863
864 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
865 (rport->port_state == FC_PORTSTATE_DELETED) ||
866 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
867 return -EBUSY;
868 /*
869 * Check for overflow; dev_loss_tmo is u32
870 */
871 if (val > UINT_MAX)
872 return -EINVAL;
873
874 /*
875 * If fast_io_fail is off we have to cap
876 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
877 */
878 if (rport->fast_io_fail_tmo == -1 &&
879 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
880 return -EINVAL;
881
882 i->f->set_rport_dev_loss_tmo(rport, val);
883 return 0;
884 }
885
886 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
887 static ssize_t
888 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
889 const char *buf, size_t count)
890 {
891 struct fc_rport *rport = transport_class_to_rport(dev);
892 unsigned long val;
893 int rc;
894
895 rc = fc_str_to_dev_loss(buf, &val);
896 if (rc)
897 return rc;
898
899 rc = fc_rport_set_dev_loss_tmo(rport, val);
900 if (rc)
901 return rc;
902 return count;
903 }
904 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
905 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
906
907
908 /* Private Remote Port Attributes */
909
910 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
911 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
912 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
913
914 static ssize_t
915 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
916 char *buf)
917 {
918 struct fc_rport *rport = transport_class_to_rport(dev);
919
920 /* identify any roles that are port_id specific */
921 if ((rport->port_id != -1) &&
922 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
923 FC_WELLKNOWN_PORTID_MASK) {
924 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
925 case FC_FPORT_PORTID:
926 return snprintf(buf, 30, "Fabric Port\n");
927 case FC_FABCTLR_PORTID:
928 return snprintf(buf, 30, "Fabric Controller\n");
929 case FC_DIRSRVR_PORTID:
930 return snprintf(buf, 30, "Directory Server\n");
931 case FC_TIMESRVR_PORTID:
932 return snprintf(buf, 30, "Time Server\n");
933 case FC_MGMTSRVR_PORTID:
934 return snprintf(buf, 30, "Management Server\n");
935 default:
936 return snprintf(buf, 30, "Unknown Fabric Entity\n");
937 }
938 } else {
939 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
940 return snprintf(buf, 20, "unknown\n");
941 return get_fc_port_roles_names(rport->roles, buf);
942 }
943 }
944 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
945 show_fc_rport_roles, NULL);
946
947 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
948 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
949
950 /*
951 * fast_io_fail_tmo attribute
952 */
953 static ssize_t
954 show_fc_rport_fast_io_fail_tmo (struct device *dev,
955 struct device_attribute *attr, char *buf)
956 {
957 struct fc_rport *rport = transport_class_to_rport(dev);
958
959 if (rport->fast_io_fail_tmo == -1)
960 return snprintf(buf, 5, "off\n");
961 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
962 }
963
964 static ssize_t
965 store_fc_rport_fast_io_fail_tmo(struct device *dev,
966 struct device_attribute *attr, const char *buf,
967 size_t count)
968 {
969 int val;
970 char *cp;
971 struct fc_rport *rport = transport_class_to_rport(dev);
972
973 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
974 (rport->port_state == FC_PORTSTATE_DELETED) ||
975 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
976 return -EBUSY;
977 if (strncmp(buf, "off", 3) == 0)
978 rport->fast_io_fail_tmo = -1;
979 else {
980 val = simple_strtoul(buf, &cp, 0);
981 if ((*cp && (*cp != '\n')) || (val < 0))
982 return -EINVAL;
983 /*
984 * Cap fast_io_fail by dev_loss_tmo or
985 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
986 */
987 if ((val >= rport->dev_loss_tmo) ||
988 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
989 return -EINVAL;
990
991 rport->fast_io_fail_tmo = val;
992 }
993 return count;
994 }
995 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
996 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
997
998
999 /*
1000 * FC SCSI Target Attribute Management
1001 */
1002
1003 /*
1004 * Note: in the target show function we recognize when the remote
1005 * port is in the hierarchy and do not allow the driver to get
1006 * involved in sysfs functions. The driver only gets involved if
1007 * it's the "old" style that doesn't use rports.
1008 */
1009 #define fc_starget_show_function(field, format_string, sz, cast) \
1010 static ssize_t \
1011 show_fc_starget_##field (struct device *dev, \
1012 struct device_attribute *attr, char *buf) \
1013 { \
1014 struct scsi_target *starget = transport_class_to_starget(dev); \
1015 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1016 struct fc_internal *i = to_fc_internal(shost->transportt); \
1017 struct fc_rport *rport = starget_to_rport(starget); \
1018 if (rport) \
1019 fc_starget_##field(starget) = rport->field; \
1020 else if (i->f->get_starget_##field) \
1021 i->f->get_starget_##field(starget); \
1022 return snprintf(buf, sz, format_string, \
1023 cast fc_starget_##field(starget)); \
1024 }
1025
1026 #define fc_starget_rd_attr(field, format_string, sz) \
1027 fc_starget_show_function(field, format_string, sz, ) \
1028 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1029 show_fc_starget_##field, NULL)
1030
1031 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1032 fc_starget_show_function(field, format_string, sz, (cast)) \
1033 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1034 show_fc_starget_##field, NULL)
1035
1036 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1037 i->private_starget_attrs[count] = device_attr_starget_##field; \
1038 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1039 i->private_starget_attrs[count].store = NULL; \
1040 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1041 if (i->f->show_starget_##field) \
1042 count++
1043
1044 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1045 i->private_starget_attrs[count] = device_attr_starget_##field; \
1046 if (!i->f->set_starget_##field) { \
1047 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1048 i->private_starget_attrs[count].store = NULL; \
1049 } \
1050 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1051 if (i->f->show_starget_##field) \
1052 count++
1053
1054 /* The FC Transport SCSI Target Attributes: */
1055 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1056 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1057 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1058
1059
1060 /*
1061 * FC Virtual Port Attribute Management
1062 */
1063
1064 #define fc_vport_show_function(field, format_string, sz, cast) \
1065 static ssize_t \
1066 show_fc_vport_##field (struct device *dev, \
1067 struct device_attribute *attr, char *buf) \
1068 { \
1069 struct fc_vport *vport = transport_class_to_vport(dev); \
1070 struct Scsi_Host *shost = vport_to_shost(vport); \
1071 struct fc_internal *i = to_fc_internal(shost->transportt); \
1072 if ((i->f->get_vport_##field) && \
1073 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1074 i->f->get_vport_##field(vport); \
1075 return snprintf(buf, sz, format_string, cast vport->field); \
1076 }
1077
1078 #define fc_vport_store_function(field) \
1079 static ssize_t \
1080 store_fc_vport_##field(struct device *dev, \
1081 struct device_attribute *attr, \
1082 const char *buf, size_t count) \
1083 { \
1084 int val; \
1085 struct fc_vport *vport = transport_class_to_vport(dev); \
1086 struct Scsi_Host *shost = vport_to_shost(vport); \
1087 struct fc_internal *i = to_fc_internal(shost->transportt); \
1088 char *cp; \
1089 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1090 return -EBUSY; \
1091 val = simple_strtoul(buf, &cp, 0); \
1092 if (*cp && (*cp != '\n')) \
1093 return -EINVAL; \
1094 i->f->set_vport_##field(vport, val); \
1095 return count; \
1096 }
1097
1098 #define fc_vport_store_str_function(field, slen) \
1099 static ssize_t \
1100 store_fc_vport_##field(struct device *dev, \
1101 struct device_attribute *attr, \
1102 const char *buf, size_t count) \
1103 { \
1104 struct fc_vport *vport = transport_class_to_vport(dev); \
1105 struct Scsi_Host *shost = vport_to_shost(vport); \
1106 struct fc_internal *i = to_fc_internal(shost->transportt); \
1107 unsigned int cnt=count; \
1108 \
1109 /* count may include a LF at end of string */ \
1110 if (buf[cnt-1] == '\n') \
1111 cnt--; \
1112 if (cnt > ((slen) - 1)) \
1113 return -EINVAL; \
1114 memcpy(vport->field, buf, cnt); \
1115 i->f->set_vport_##field(vport); \
1116 return count; \
1117 }
1118
1119 #define fc_vport_rd_attr(field, format_string, sz) \
1120 fc_vport_show_function(field, format_string, sz, ) \
1121 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1122 show_fc_vport_##field, NULL)
1123
1124 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1125 fc_vport_show_function(field, format_string, sz, (cast)) \
1126 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1127 show_fc_vport_##field, NULL)
1128
1129 #define fc_vport_rw_attr(field, format_string, sz) \
1130 fc_vport_show_function(field, format_string, sz, ) \
1131 fc_vport_store_function(field) \
1132 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1133 show_fc_vport_##field, \
1134 store_fc_vport_##field)
1135
1136 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1137 static ssize_t \
1138 show_fc_vport_##field (struct device *dev, \
1139 struct device_attribute *attr, char *buf) \
1140 { \
1141 struct fc_vport *vport = transport_class_to_vport(dev); \
1142 return snprintf(buf, sz, format_string, cast vport->field); \
1143 }
1144
1145 #define fc_private_vport_store_u32_function(field) \
1146 static ssize_t \
1147 store_fc_vport_##field(struct device *dev, \
1148 struct device_attribute *attr, \
1149 const char *buf, size_t count) \
1150 { \
1151 u32 val; \
1152 struct fc_vport *vport = transport_class_to_vport(dev); \
1153 char *cp; \
1154 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1155 return -EBUSY; \
1156 val = simple_strtoul(buf, &cp, 0); \
1157 if (*cp && (*cp != '\n')) \
1158 return -EINVAL; \
1159 vport->field = val; \
1160 return count; \
1161 }
1162
1163
1164 #define fc_private_vport_rd_attr(field, format_string, sz) \
1165 fc_private_vport_show_function(field, format_string, sz, ) \
1166 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1167 show_fc_vport_##field, NULL)
1168
1169 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1170 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1171 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1172 show_fc_vport_##field, NULL)
1173
1174 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1175 fc_private_vport_show_function(field, format_string, sz, ) \
1176 fc_private_vport_store_u32_function(field) \
1177 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1178 show_fc_vport_##field, \
1179 store_fc_vport_##field)
1180
1181
1182 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1183 static ssize_t \
1184 show_fc_vport_##title (struct device *dev, \
1185 struct device_attribute *attr, \
1186 char *buf) \
1187 { \
1188 struct fc_vport *vport = transport_class_to_vport(dev); \
1189 const char *name; \
1190 name = get_fc_##title##_name(vport->title); \
1191 if (!name) \
1192 return -EINVAL; \
1193 return snprintf(buf, maxlen, "%s\n", name); \
1194 } \
1195 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1196 show_fc_vport_##title, NULL)
1197
1198
1199 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1200 i->private_vport_attrs[count] = device_attr_vport_##field; \
1201 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1202 i->private_vport_attrs[count].store = NULL; \
1203 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1204 if (i->f->get_##field) \
1205 count++
1206 /* NOTE: Above MACRO differs: checks function not show bit */
1207
1208 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1209 i->private_vport_attrs[count] = device_attr_vport_##field; \
1210 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1211 i->private_vport_attrs[count].store = NULL; \
1212 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1213 count++
1214
1215 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1216 i->private_vport_attrs[count] = device_attr_vport_##field; \
1217 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1218 if (i->f->field) \
1219 count++
1220 /* NOTE: Above MACRO differs: checks function */
1221
1222 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1223 i->private_vport_attrs[count] = device_attr_vport_##field; \
1224 if (!i->f->set_vport_##field) { \
1225 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1226 i->private_vport_attrs[count].store = NULL; \
1227 } \
1228 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1229 count++
1230 /* NOTE: Above MACRO differs: does not check show bit */
1231
1232 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1233 { \
1234 i->private_vport_attrs[count] = device_attr_vport_##field; \
1235 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1236 count++; \
1237 }
1238
1239
1240 /* The FC Transport Virtual Port Attributes: */
1241
1242 /* Fixed Virtual Port Attributes */
1243
1244 /* Dynamic Virtual Port Attributes */
1245
1246 /* Private Virtual Port Attributes */
1247
1248 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1249 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1250 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1251 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1252
1253 static ssize_t
1254 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1255 char *buf)
1256 {
1257 struct fc_vport *vport = transport_class_to_vport(dev);
1258
1259 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1260 return snprintf(buf, 20, "unknown\n");
1261 return get_fc_port_roles_names(vport->roles, buf);
1262 }
1263 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1264
1265 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1266
1267 fc_private_vport_show_function(symbolic_name, "%s\n",
1268 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1269 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1270 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1271 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1272
1273 static ssize_t
1274 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1275 const char *buf, size_t count)
1276 {
1277 struct fc_vport *vport = transport_class_to_vport(dev);
1278 struct Scsi_Host *shost = vport_to_shost(vport);
1279 unsigned long flags;
1280
1281 spin_lock_irqsave(shost->host_lock, flags);
1282 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1283 spin_unlock_irqrestore(shost->host_lock, flags);
1284 return -EBUSY;
1285 }
1286 vport->flags |= FC_VPORT_DELETING;
1287 spin_unlock_irqrestore(shost->host_lock, flags);
1288
1289 fc_queue_work(shost, &vport->vport_delete_work);
1290 return count;
1291 }
1292 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1293 NULL, store_fc_vport_delete);
1294
1295
1296 /*
1297 * Enable/Disable vport
1298 * Write "1" to disable, write "0" to enable
1299 */
1300 static ssize_t
1301 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1302 const char *buf,
1303 size_t count)
1304 {
1305 struct fc_vport *vport = transport_class_to_vport(dev);
1306 struct Scsi_Host *shost = vport_to_shost(vport);
1307 struct fc_internal *i = to_fc_internal(shost->transportt);
1308 int stat;
1309
1310 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1311 return -EBUSY;
1312
1313 if (*buf == '0') {
1314 if (vport->vport_state != FC_VPORT_DISABLED)
1315 return -EALREADY;
1316 } else if (*buf == '1') {
1317 if (vport->vport_state == FC_VPORT_DISABLED)
1318 return -EALREADY;
1319 } else
1320 return -EINVAL;
1321
1322 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1323 return stat ? stat : count;
1324 }
1325 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1326 NULL, store_fc_vport_disable);
1327
1328
1329 /*
1330 * Host Attribute Management
1331 */
1332
1333 #define fc_host_show_function(field, format_string, sz, cast) \
1334 static ssize_t \
1335 show_fc_host_##field (struct device *dev, \
1336 struct device_attribute *attr, char *buf) \
1337 { \
1338 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1339 struct fc_internal *i = to_fc_internal(shost->transportt); \
1340 if (i->f->get_host_##field) \
1341 i->f->get_host_##field(shost); \
1342 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1343 }
1344
1345 #define fc_host_store_function(field) \
1346 static ssize_t \
1347 store_fc_host_##field(struct device *dev, \
1348 struct device_attribute *attr, \
1349 const char *buf, size_t count) \
1350 { \
1351 int val; \
1352 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1353 struct fc_internal *i = to_fc_internal(shost->transportt); \
1354 char *cp; \
1355 \
1356 val = simple_strtoul(buf, &cp, 0); \
1357 if (*cp && (*cp != '\n')) \
1358 return -EINVAL; \
1359 i->f->set_host_##field(shost, val); \
1360 return count; \
1361 }
1362
1363 #define fc_host_store_str_function(field, slen) \
1364 static ssize_t \
1365 store_fc_host_##field(struct device *dev, \
1366 struct device_attribute *attr, \
1367 const char *buf, size_t count) \
1368 { \
1369 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1370 struct fc_internal *i = to_fc_internal(shost->transportt); \
1371 unsigned int cnt=count; \
1372 \
1373 /* count may include a LF at end of string */ \
1374 if (buf[cnt-1] == '\n') \
1375 cnt--; \
1376 if (cnt > ((slen) - 1)) \
1377 return -EINVAL; \
1378 memcpy(fc_host_##field(shost), buf, cnt); \
1379 i->f->set_host_##field(shost); \
1380 return count; \
1381 }
1382
1383 #define fc_host_rd_attr(field, format_string, sz) \
1384 fc_host_show_function(field, format_string, sz, ) \
1385 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1386 show_fc_host_##field, NULL)
1387
1388 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1389 fc_host_show_function(field, format_string, sz, (cast)) \
1390 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1391 show_fc_host_##field, NULL)
1392
1393 #define fc_host_rw_attr(field, format_string, sz) \
1394 fc_host_show_function(field, format_string, sz, ) \
1395 fc_host_store_function(field) \
1396 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1397 show_fc_host_##field, \
1398 store_fc_host_##field)
1399
1400 #define fc_host_rd_enum_attr(title, maxlen) \
1401 static ssize_t \
1402 show_fc_host_##title (struct device *dev, \
1403 struct device_attribute *attr, char *buf) \
1404 { \
1405 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1406 struct fc_internal *i = to_fc_internal(shost->transportt); \
1407 const char *name; \
1408 if (i->f->get_host_##title) \
1409 i->f->get_host_##title(shost); \
1410 name = get_fc_##title##_name(fc_host_##title(shost)); \
1411 if (!name) \
1412 return -EINVAL; \
1413 return snprintf(buf, maxlen, "%s\n", name); \
1414 } \
1415 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1416
1417 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1418 i->private_host_attrs[count] = device_attr_host_##field; \
1419 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1420 i->private_host_attrs[count].store = NULL; \
1421 i->host_attrs[count] = &i->private_host_attrs[count]; \
1422 if (i->f->show_host_##field) \
1423 count++
1424
1425 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1426 i->private_host_attrs[count] = device_attr_host_##field; \
1427 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1428 i->private_host_attrs[count].store = NULL; \
1429 i->host_attrs[count] = &i->private_host_attrs[count]; \
1430 count++
1431
1432 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1433 i->private_host_attrs[count] = device_attr_host_##field; \
1434 if (!i->f->set_host_##field) { \
1435 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1436 i->private_host_attrs[count].store = NULL; \
1437 } \
1438 i->host_attrs[count] = &i->private_host_attrs[count]; \
1439 if (i->f->show_host_##field) \
1440 count++
1441
1442
1443 #define fc_private_host_show_function(field, format_string, sz, cast) \
1444 static ssize_t \
1445 show_fc_host_##field (struct device *dev, \
1446 struct device_attribute *attr, char *buf) \
1447 { \
1448 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1449 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1450 }
1451
1452 #define fc_private_host_rd_attr(field, format_string, sz) \
1453 fc_private_host_show_function(field, format_string, sz, ) \
1454 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1455 show_fc_host_##field, NULL)
1456
1457 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1458 fc_private_host_show_function(field, format_string, sz, (cast)) \
1459 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1460 show_fc_host_##field, NULL)
1461
1462 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1463 i->private_host_attrs[count] = device_attr_host_##field; \
1464 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1465 i->private_host_attrs[count].store = NULL; \
1466 i->host_attrs[count] = &i->private_host_attrs[count]; \
1467 count++
1468
1469 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1470 { \
1471 i->private_host_attrs[count] = device_attr_host_##field; \
1472 i->host_attrs[count] = &i->private_host_attrs[count]; \
1473 count++; \
1474 }
1475
1476
1477 /* Fixed Host Attributes */
1478
1479 static ssize_t
1480 show_fc_host_supported_classes (struct device *dev,
1481 struct device_attribute *attr, char *buf)
1482 {
1483 struct Scsi_Host *shost = transport_class_to_shost(dev);
1484
1485 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1486 return snprintf(buf, 20, "unspecified\n");
1487
1488 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1489 }
1490 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1491 show_fc_host_supported_classes, NULL);
1492
1493 static ssize_t
1494 show_fc_host_supported_fc4s (struct device *dev,
1495 struct device_attribute *attr, char *buf)
1496 {
1497 struct Scsi_Host *shost = transport_class_to_shost(dev);
1498 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1499 }
1500 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1501 show_fc_host_supported_fc4s, NULL);
1502
1503 static ssize_t
1504 show_fc_host_supported_speeds (struct device *dev,
1505 struct device_attribute *attr, char *buf)
1506 {
1507 struct Scsi_Host *shost = transport_class_to_shost(dev);
1508
1509 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1510 return snprintf(buf, 20, "unknown\n");
1511
1512 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1513 }
1514 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1515 show_fc_host_supported_speeds, NULL);
1516
1517
1518 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1519 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1520 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1521 unsigned long long);
1522 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1523 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1524 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1525 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1526 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1527 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1528 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1529 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1530 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1531 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1532
1533
1534 /* Dynamic Host Attributes */
1535
1536 static ssize_t
1537 show_fc_host_active_fc4s (struct device *dev,
1538 struct device_attribute *attr, char *buf)
1539 {
1540 struct Scsi_Host *shost = transport_class_to_shost(dev);
1541 struct fc_internal *i = to_fc_internal(shost->transportt);
1542
1543 if (i->f->get_host_active_fc4s)
1544 i->f->get_host_active_fc4s(shost);
1545
1546 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1547 }
1548 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1549 show_fc_host_active_fc4s, NULL);
1550
1551 static ssize_t
1552 show_fc_host_speed (struct device *dev,
1553 struct device_attribute *attr, char *buf)
1554 {
1555 struct Scsi_Host *shost = transport_class_to_shost(dev);
1556 struct fc_internal *i = to_fc_internal(shost->transportt);
1557
1558 if (i->f->get_host_speed)
1559 i->f->get_host_speed(shost);
1560
1561 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1562 return snprintf(buf, 20, "unknown\n");
1563
1564 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1565 }
1566 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1567 show_fc_host_speed, NULL);
1568
1569
1570 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1571 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1572 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1573 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1574 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1575
1576 fc_private_host_show_function(system_hostname, "%s\n",
1577 FC_SYMBOLIC_NAME_SIZE + 1, )
1578 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1579 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1580 show_fc_host_system_hostname, store_fc_host_system_hostname);
1581
1582
1583 /* Private Host Attributes */
1584
1585 static ssize_t
1586 show_fc_private_host_tgtid_bind_type(struct device *dev,
1587 struct device_attribute *attr, char *buf)
1588 {
1589 struct Scsi_Host *shost = transport_class_to_shost(dev);
1590 const char *name;
1591
1592 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1593 if (!name)
1594 return -EINVAL;
1595 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1596 }
1597
1598 #define get_list_head_entry(pos, head, member) \
1599 pos = list_entry((head)->next, typeof(*pos), member)
1600
1601 static ssize_t
1602 store_fc_private_host_tgtid_bind_type(struct device *dev,
1603 struct device_attribute *attr, const char *buf, size_t count)
1604 {
1605 struct Scsi_Host *shost = transport_class_to_shost(dev);
1606 struct fc_rport *rport;
1607 enum fc_tgtid_binding_type val;
1608 unsigned long flags;
1609
1610 if (get_fc_tgtid_bind_type_match(buf, &val))
1611 return -EINVAL;
1612
1613 /* if changing bind type, purge all unused consistent bindings */
1614 if (val != fc_host_tgtid_bind_type(shost)) {
1615 spin_lock_irqsave(shost->host_lock, flags);
1616 while (!list_empty(&fc_host_rport_bindings(shost))) {
1617 get_list_head_entry(rport,
1618 &fc_host_rport_bindings(shost), peers);
1619 list_del(&rport->peers);
1620 rport->port_state = FC_PORTSTATE_DELETED;
1621 fc_queue_work(shost, &rport->rport_delete_work);
1622 }
1623 spin_unlock_irqrestore(shost->host_lock, flags);
1624 }
1625
1626 fc_host_tgtid_bind_type(shost) = val;
1627 return count;
1628 }
1629
1630 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1631 show_fc_private_host_tgtid_bind_type,
1632 store_fc_private_host_tgtid_bind_type);
1633
1634 static ssize_t
1635 store_fc_private_host_issue_lip(struct device *dev,
1636 struct device_attribute *attr, const char *buf, size_t count)
1637 {
1638 struct Scsi_Host *shost = transport_class_to_shost(dev);
1639 struct fc_internal *i = to_fc_internal(shost->transportt);
1640 int ret;
1641
1642 /* ignore any data value written to the attribute */
1643 if (i->f->issue_fc_host_lip) {
1644 ret = i->f->issue_fc_host_lip(shost);
1645 return ret ? ret: count;
1646 }
1647
1648 return -ENOENT;
1649 }
1650
1651 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1652 store_fc_private_host_issue_lip);
1653
1654 static ssize_t
1655 store_fc_private_host_dev_loss_tmo(struct device *dev,
1656 struct device_attribute *attr,
1657 const char *buf, size_t count)
1658 {
1659 struct Scsi_Host *shost = transport_class_to_shost(dev);
1660 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1661 struct fc_rport *rport;
1662 unsigned long val, flags;
1663 int rc;
1664
1665 rc = fc_str_to_dev_loss(buf, &val);
1666 if (rc)
1667 return rc;
1668
1669 fc_host_dev_loss_tmo(shost) = val;
1670 spin_lock_irqsave(shost->host_lock, flags);
1671 list_for_each_entry(rport, &fc_host->rports, peers)
1672 fc_rport_set_dev_loss_tmo(rport, val);
1673 spin_unlock_irqrestore(shost->host_lock, flags);
1674 return count;
1675 }
1676
1677 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1678 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1679 show_fc_host_dev_loss_tmo,
1680 store_fc_private_host_dev_loss_tmo);
1681
1682 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1683
1684 /*
1685 * Host Statistics Management
1686 */
1687
1688 /* Show a given an attribute in the statistics group */
1689 static ssize_t
1690 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1691 {
1692 struct Scsi_Host *shost = transport_class_to_shost(dev);
1693 struct fc_internal *i = to_fc_internal(shost->transportt);
1694 struct fc_host_statistics *stats;
1695 ssize_t ret = -ENOENT;
1696
1697 if (offset > sizeof(struct fc_host_statistics) ||
1698 offset % sizeof(u64) != 0)
1699 WARN_ON(1);
1700
1701 if (i->f->get_fc_host_stats) {
1702 stats = (i->f->get_fc_host_stats)(shost);
1703 if (stats)
1704 ret = snprintf(buf, 20, "0x%llx\n",
1705 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1706 }
1707 return ret;
1708 }
1709
1710
1711 /* generate a read-only statistics attribute */
1712 #define fc_host_statistic(name) \
1713 static ssize_t show_fcstat_##name(struct device *cd, \
1714 struct device_attribute *attr, \
1715 char *buf) \
1716 { \
1717 return fc_stat_show(cd, buf, \
1718 offsetof(struct fc_host_statistics, name)); \
1719 } \
1720 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1721
1722 fc_host_statistic(seconds_since_last_reset);
1723 fc_host_statistic(tx_frames);
1724 fc_host_statistic(tx_words);
1725 fc_host_statistic(rx_frames);
1726 fc_host_statistic(rx_words);
1727 fc_host_statistic(lip_count);
1728 fc_host_statistic(nos_count);
1729 fc_host_statistic(error_frames);
1730 fc_host_statistic(dumped_frames);
1731 fc_host_statistic(link_failure_count);
1732 fc_host_statistic(loss_of_sync_count);
1733 fc_host_statistic(loss_of_signal_count);
1734 fc_host_statistic(prim_seq_protocol_err_count);
1735 fc_host_statistic(invalid_tx_word_count);
1736 fc_host_statistic(invalid_crc_count);
1737 fc_host_statistic(fcp_input_requests);
1738 fc_host_statistic(fcp_output_requests);
1739 fc_host_statistic(fcp_control_requests);
1740 fc_host_statistic(fcp_input_megabytes);
1741 fc_host_statistic(fcp_output_megabytes);
1742 fc_host_statistic(fcp_packet_alloc_failures);
1743 fc_host_statistic(fcp_packet_aborts);
1744 fc_host_statistic(fcp_frame_alloc_failures);
1745 fc_host_statistic(fc_no_free_exch);
1746 fc_host_statistic(fc_no_free_exch_xid);
1747 fc_host_statistic(fc_xid_not_found);
1748 fc_host_statistic(fc_xid_busy);
1749 fc_host_statistic(fc_seq_not_found);
1750 fc_host_statistic(fc_non_bls_resp);
1751
1752 static ssize_t
1753 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1754 const char *buf, size_t count)
1755 {
1756 struct Scsi_Host *shost = transport_class_to_shost(dev);
1757 struct fc_internal *i = to_fc_internal(shost->transportt);
1758
1759 /* ignore any data value written to the attribute */
1760 if (i->f->reset_fc_host_stats) {
1761 i->f->reset_fc_host_stats(shost);
1762 return count;
1763 }
1764
1765 return -ENOENT;
1766 }
1767 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1768 fc_reset_statistics);
1769
1770 static struct attribute *fc_statistics_attrs[] = {
1771 &device_attr_host_seconds_since_last_reset.attr,
1772 &device_attr_host_tx_frames.attr,
1773 &device_attr_host_tx_words.attr,
1774 &device_attr_host_rx_frames.attr,
1775 &device_attr_host_rx_words.attr,
1776 &device_attr_host_lip_count.attr,
1777 &device_attr_host_nos_count.attr,
1778 &device_attr_host_error_frames.attr,
1779 &device_attr_host_dumped_frames.attr,
1780 &device_attr_host_link_failure_count.attr,
1781 &device_attr_host_loss_of_sync_count.attr,
1782 &device_attr_host_loss_of_signal_count.attr,
1783 &device_attr_host_prim_seq_protocol_err_count.attr,
1784 &device_attr_host_invalid_tx_word_count.attr,
1785 &device_attr_host_invalid_crc_count.attr,
1786 &device_attr_host_fcp_input_requests.attr,
1787 &device_attr_host_fcp_output_requests.attr,
1788 &device_attr_host_fcp_control_requests.attr,
1789 &device_attr_host_fcp_input_megabytes.attr,
1790 &device_attr_host_fcp_output_megabytes.attr,
1791 &device_attr_host_fcp_packet_alloc_failures.attr,
1792 &device_attr_host_fcp_packet_aborts.attr,
1793 &device_attr_host_fcp_frame_alloc_failures.attr,
1794 &device_attr_host_fc_no_free_exch.attr,
1795 &device_attr_host_fc_no_free_exch_xid.attr,
1796 &device_attr_host_fc_xid_not_found.attr,
1797 &device_attr_host_fc_xid_busy.attr,
1798 &device_attr_host_fc_seq_not_found.attr,
1799 &device_attr_host_fc_non_bls_resp.attr,
1800 &device_attr_host_reset_statistics.attr,
1801 NULL
1802 };
1803
1804 static struct attribute_group fc_statistics_group = {
1805 .name = "statistics",
1806 .attrs = fc_statistics_attrs,
1807 };
1808
1809
1810 /* Host Vport Attributes */
1811
1812 static int
1813 fc_parse_wwn(const char *ns, u64 *nm)
1814 {
1815 unsigned int i, j;
1816 u8 wwn[8];
1817
1818 memset(wwn, 0, sizeof(wwn));
1819
1820 /* Validate and store the new name */
1821 for (i=0, j=0; i < 16; i++) {
1822 int value;
1823
1824 value = hex_to_bin(*ns++);
1825 if (value >= 0)
1826 j = (j << 4) | value;
1827 else
1828 return -EINVAL;
1829 if (i % 2) {
1830 wwn[i/2] = j & 0xff;
1831 j = 0;
1832 }
1833 }
1834
1835 *nm = wwn_to_u64(wwn);
1836
1837 return 0;
1838 }
1839
1840
1841 /*
1842 * "Short-cut" sysfs variable to create a new vport on a FC Host.
1843 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1844 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1845 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1846 */
1847 static ssize_t
1848 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1849 const char *buf, size_t count)
1850 {
1851 struct Scsi_Host *shost = transport_class_to_shost(dev);
1852 struct fc_vport_identifiers vid;
1853 struct fc_vport *vport;
1854 unsigned int cnt=count;
1855 int stat;
1856
1857 memset(&vid, 0, sizeof(vid));
1858
1859 /* count may include a LF at end of string */
1860 if (buf[cnt-1] == '\n')
1861 cnt--;
1862
1863 /* validate we have enough characters for WWPN */
1864 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1865 return -EINVAL;
1866
1867 stat = fc_parse_wwn(&buf[0], &vid.port_name);
1868 if (stat)
1869 return stat;
1870
1871 stat = fc_parse_wwn(&buf[17], &vid.node_name);
1872 if (stat)
1873 return stat;
1874
1875 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1876 vid.vport_type = FC_PORTTYPE_NPIV;
1877 /* vid.symbolic_name is already zero/NULL's */
1878 vid.disable = false; /* always enabled */
1879
1880 /* we only allow support on Channel 0 !!! */
1881 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1882 return stat ? stat : count;
1883 }
1884 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1885 store_fc_host_vport_create);
1886
1887
1888 /*
1889 * "Short-cut" sysfs variable to delete a vport on a FC Host.
1890 * Vport is identified by a string containing "<WWPN>:<WWNN>".
1891 * The WWNs are specified as hex characters, and may *not* contain
1892 * any prefixes (e.g. 0x, x, etc)
1893 */
1894 static ssize_t
1895 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1896 const char *buf, size_t count)
1897 {
1898 struct Scsi_Host *shost = transport_class_to_shost(dev);
1899 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1900 struct fc_vport *vport;
1901 u64 wwpn, wwnn;
1902 unsigned long flags;
1903 unsigned int cnt=count;
1904 int stat, match;
1905
1906 /* count may include a LF at end of string */
1907 if (buf[cnt-1] == '\n')
1908 cnt--;
1909
1910 /* validate we have enough characters for WWPN */
1911 if ((cnt != (16+1+16)) || (buf[16] != ':'))
1912 return -EINVAL;
1913
1914 stat = fc_parse_wwn(&buf[0], &wwpn);
1915 if (stat)
1916 return stat;
1917
1918 stat = fc_parse_wwn(&buf[17], &wwnn);
1919 if (stat)
1920 return stat;
1921
1922 spin_lock_irqsave(shost->host_lock, flags);
1923 match = 0;
1924 /* we only allow support on Channel 0 !!! */
1925 list_for_each_entry(vport, &fc_host->vports, peers) {
1926 if ((vport->channel == 0) &&
1927 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1928 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1929 break;
1930 vport->flags |= FC_VPORT_DELETING;
1931 match = 1;
1932 break;
1933 }
1934 }
1935 spin_unlock_irqrestore(shost->host_lock, flags);
1936
1937 if (!match)
1938 return -ENODEV;
1939
1940 stat = fc_vport_terminate(vport);
1941 return stat ? stat : count;
1942 }
1943 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1944 store_fc_host_vport_delete);
1945
1946
1947 static int fc_host_match(struct attribute_container *cont,
1948 struct device *dev)
1949 {
1950 struct Scsi_Host *shost;
1951 struct fc_internal *i;
1952
1953 if (!scsi_is_host_device(dev))
1954 return 0;
1955
1956 shost = dev_to_shost(dev);
1957 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1958 != &fc_host_class.class)
1959 return 0;
1960
1961 i = to_fc_internal(shost->transportt);
1962
1963 return &i->t.host_attrs.ac == cont;
1964 }
1965
1966 static int fc_target_match(struct attribute_container *cont,
1967 struct device *dev)
1968 {
1969 struct Scsi_Host *shost;
1970 struct fc_internal *i;
1971
1972 if (!scsi_is_target_device(dev))
1973 return 0;
1974
1975 shost = dev_to_shost(dev->parent);
1976 if (!shost->transportt || shost->transportt->host_attrs.ac.class
1977 != &fc_host_class.class)
1978 return 0;
1979
1980 i = to_fc_internal(shost->transportt);
1981
1982 return &i->t.target_attrs.ac == cont;
1983 }
1984
1985 static void fc_rport_dev_release(struct device *dev)
1986 {
1987 struct fc_rport *rport = dev_to_rport(dev);
1988 put_device(dev->parent);
1989 kfree(rport);
1990 }
1991
1992 int scsi_is_fc_rport(const struct device *dev)
1993 {
1994 return dev->release == fc_rport_dev_release;
1995 }
1996 EXPORT_SYMBOL(scsi_is_fc_rport);
1997
1998 static int fc_rport_match(struct attribute_container *cont,
1999 struct device *dev)
2000 {
2001 struct Scsi_Host *shost;
2002 struct fc_internal *i;
2003
2004 if (!scsi_is_fc_rport(dev))
2005 return 0;
2006
2007 shost = dev_to_shost(dev->parent);
2008 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2009 != &fc_host_class.class)
2010 return 0;
2011
2012 i = to_fc_internal(shost->transportt);
2013
2014 return &i->rport_attr_cont.ac == cont;
2015 }
2016
2017
2018 static void fc_vport_dev_release(struct device *dev)
2019 {
2020 struct fc_vport *vport = dev_to_vport(dev);
2021 put_device(dev->parent); /* release kobj parent */
2022 kfree(vport);
2023 }
2024
2025 int scsi_is_fc_vport(const struct device *dev)
2026 {
2027 return dev->release == fc_vport_dev_release;
2028 }
2029 EXPORT_SYMBOL(scsi_is_fc_vport);
2030
2031 static int fc_vport_match(struct attribute_container *cont,
2032 struct device *dev)
2033 {
2034 struct fc_vport *vport;
2035 struct Scsi_Host *shost;
2036 struct fc_internal *i;
2037
2038 if (!scsi_is_fc_vport(dev))
2039 return 0;
2040 vport = dev_to_vport(dev);
2041
2042 shost = vport_to_shost(vport);
2043 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2044 != &fc_host_class.class)
2045 return 0;
2046
2047 i = to_fc_internal(shost->transportt);
2048 return &i->vport_attr_cont.ac == cont;
2049 }
2050
2051
2052 /**
2053 * fc_timed_out - FC Transport I/O timeout intercept handler
2054 * @scmd: The SCSI command which timed out
2055 *
2056 * This routine protects against error handlers getting invoked while a
2057 * rport is in a blocked state, typically due to a temporarily loss of
2058 * connectivity. If the error handlers are allowed to proceed, requests
2059 * to abort i/o, reset the target, etc will likely fail as there is no way
2060 * to communicate with the device to perform the requested function. These
2061 * failures may result in the midlayer taking the device offline, requiring
2062 * manual intervention to restore operation.
2063 *
2064 * This routine, called whenever an i/o times out, validates the state of
2065 * the underlying rport. If the rport is blocked, it returns
2066 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2067 * Eventually, either the device will return, or devloss_tmo will fire,
2068 * and when the timeout then fires, it will be handled normally.
2069 * If the rport is not blocked, normal error handling continues.
2070 *
2071 * Notes:
2072 * This routine assumes no locks are held on entry.
2073 */
2074 static enum blk_eh_timer_return
2075 fc_timed_out(struct scsi_cmnd *scmd)
2076 {
2077 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2078
2079 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2080 return BLK_EH_RESET_TIMER;
2081
2082 return BLK_EH_NOT_HANDLED;
2083 }
2084
2085 /*
2086 * Called by fc_user_scan to locate an rport on the shost that
2087 * matches the channel and target id, and invoke scsi_scan_target()
2088 * on the rport.
2089 */
2090 static void
2091 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2092 {
2093 struct fc_rport *rport;
2094 unsigned long flags;
2095
2096 spin_lock_irqsave(shost->host_lock, flags);
2097
2098 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2099 if (rport->scsi_target_id == -1)
2100 continue;
2101
2102 if (rport->port_state != FC_PORTSTATE_ONLINE)
2103 continue;
2104
2105 if ((channel == rport->channel) &&
2106 (id == rport->scsi_target_id)) {
2107 spin_unlock_irqrestore(shost->host_lock, flags);
2108 scsi_scan_target(&rport->dev, channel, id, lun, 1);
2109 return;
2110 }
2111 }
2112
2113 spin_unlock_irqrestore(shost->host_lock, flags);
2114 }
2115
2116 /*
2117 * Called via sysfs scan routines. Necessary, as the FC transport
2118 * wants to place all target objects below the rport object. So this
2119 * routine must invoke the scsi_scan_target() routine with the rport
2120 * object as the parent.
2121 */
2122 static int
2123 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2124 {
2125 uint chlo, chhi;
2126 uint tgtlo, tgthi;
2127
2128 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2129 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2130 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2131 return -EINVAL;
2132
2133 if (channel == SCAN_WILD_CARD) {
2134 chlo = 0;
2135 chhi = shost->max_channel + 1;
2136 } else {
2137 chlo = channel;
2138 chhi = channel + 1;
2139 }
2140
2141 if (id == SCAN_WILD_CARD) {
2142 tgtlo = 0;
2143 tgthi = shost->max_id;
2144 } else {
2145 tgtlo = id;
2146 tgthi = id + 1;
2147 }
2148
2149 for ( ; chlo < chhi; chlo++)
2150 for ( ; tgtlo < tgthi; tgtlo++)
2151 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2152
2153 return 0;
2154 }
2155
2156 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2157 int result)
2158 {
2159 struct fc_internal *i = to_fc_internal(shost->transportt);
2160 return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2161 }
2162
2163 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2164 {
2165 struct fc_internal *i = to_fc_internal(shost->transportt);
2166 return i->f->it_nexus_response(shost, nexus, result);
2167 }
2168
2169 struct scsi_transport_template *
2170 fc_attach_transport(struct fc_function_template *ft)
2171 {
2172 int count;
2173 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2174 GFP_KERNEL);
2175
2176 if (unlikely(!i))
2177 return NULL;
2178
2179 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2180 i->t.target_attrs.ac.class = &fc_transport_class.class;
2181 i->t.target_attrs.ac.match = fc_target_match;
2182 i->t.target_size = sizeof(struct fc_starget_attrs);
2183 transport_container_register(&i->t.target_attrs);
2184
2185 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2186 i->t.host_attrs.ac.class = &fc_host_class.class;
2187 i->t.host_attrs.ac.match = fc_host_match;
2188 i->t.host_size = sizeof(struct fc_host_attrs);
2189 if (ft->get_fc_host_stats)
2190 i->t.host_attrs.statistics = &fc_statistics_group;
2191 transport_container_register(&i->t.host_attrs);
2192
2193 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2194 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2195 i->rport_attr_cont.ac.match = fc_rport_match;
2196 transport_container_register(&i->rport_attr_cont);
2197
2198 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2199 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2200 i->vport_attr_cont.ac.match = fc_vport_match;
2201 transport_container_register(&i->vport_attr_cont);
2202
2203 i->f = ft;
2204
2205 /* Transport uses the shost workq for scsi scanning */
2206 i->t.create_work_queue = 1;
2207
2208 i->t.eh_timed_out = fc_timed_out;
2209
2210 i->t.user_scan = fc_user_scan;
2211
2212 /* target-mode drivers' functions */
2213 i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2214 i->t.it_nexus_response = fc_it_nexus_response;
2215
2216 /*
2217 * Setup SCSI Target Attributes.
2218 */
2219 count = 0;
2220 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2221 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2222 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2223
2224 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2225
2226 i->starget_attrs[count] = NULL;
2227
2228
2229 /*
2230 * Setup SCSI Host Attributes.
2231 */
2232 count=0;
2233 SETUP_HOST_ATTRIBUTE_RD(node_name);
2234 SETUP_HOST_ATTRIBUTE_RD(port_name);
2235 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2236 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2237 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2238 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2239 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2240 if (ft->vport_create) {
2241 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2242 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2243 }
2244 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2245 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2246 SETUP_HOST_ATTRIBUTE_RD(model);
2247 SETUP_HOST_ATTRIBUTE_RD(model_description);
2248 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2249 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2250 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2251 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2252
2253 SETUP_HOST_ATTRIBUTE_RD(port_id);
2254 SETUP_HOST_ATTRIBUTE_RD(port_type);
2255 SETUP_HOST_ATTRIBUTE_RD(port_state);
2256 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2257 SETUP_HOST_ATTRIBUTE_RD(speed);
2258 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2259 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2260 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2261
2262 /* Transport-managed attributes */
2263 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2264 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2265 if (ft->issue_fc_host_lip)
2266 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2267 if (ft->vport_create)
2268 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2269 if (ft->vport_delete)
2270 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2271
2272 BUG_ON(count > FC_HOST_NUM_ATTRS);
2273
2274 i->host_attrs[count] = NULL;
2275
2276 /*
2277 * Setup Remote Port Attributes.
2278 */
2279 count=0;
2280 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2281 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2282 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2283 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2284 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2285 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2286 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2287 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2288 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2289 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2290
2291 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2292
2293 i->rport_attrs[count] = NULL;
2294
2295 /*
2296 * Setup Virtual Port Attributes.
2297 */
2298 count=0;
2299 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2300 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2301 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2302 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2303 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2304 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2305 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2306 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2307 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2308
2309 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2310
2311 i->vport_attrs[count] = NULL;
2312
2313 return &i->t;
2314 }
2315 EXPORT_SYMBOL(fc_attach_transport);
2316
2317 void fc_release_transport(struct scsi_transport_template *t)
2318 {
2319 struct fc_internal *i = to_fc_internal(t);
2320
2321 transport_container_unregister(&i->t.target_attrs);
2322 transport_container_unregister(&i->t.host_attrs);
2323 transport_container_unregister(&i->rport_attr_cont);
2324 transport_container_unregister(&i->vport_attr_cont);
2325
2326 kfree(i);
2327 }
2328 EXPORT_SYMBOL(fc_release_transport);
2329
2330 /**
2331 * fc_queue_work - Queue work to the fc_host workqueue.
2332 * @shost: Pointer to Scsi_Host bound to fc_host.
2333 * @work: Work to queue for execution.
2334 *
2335 * Return value:
2336 * 1 - work queued for execution
2337 * 0 - work is already queued
2338 * -EINVAL - work queue doesn't exist
2339 */
2340 static int
2341 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2342 {
2343 if (unlikely(!fc_host_work_q(shost))) {
2344 printk(KERN_ERR
2345 "ERROR: FC host '%s' attempted to queue work, "
2346 "when no workqueue created.\n", shost->hostt->name);
2347 dump_stack();
2348
2349 return -EINVAL;
2350 }
2351
2352 return queue_work(fc_host_work_q(shost), work);
2353 }
2354
2355 /**
2356 * fc_flush_work - Flush a fc_host's workqueue.
2357 * @shost: Pointer to Scsi_Host bound to fc_host.
2358 */
2359 static void
2360 fc_flush_work(struct Scsi_Host *shost)
2361 {
2362 if (!fc_host_work_q(shost)) {
2363 printk(KERN_ERR
2364 "ERROR: FC host '%s' attempted to flush work, "
2365 "when no workqueue created.\n", shost->hostt->name);
2366 dump_stack();
2367 return;
2368 }
2369
2370 flush_workqueue(fc_host_work_q(shost));
2371 }
2372
2373 /**
2374 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2375 * @shost: Pointer to Scsi_Host bound to fc_host.
2376 * @work: Work to queue for execution.
2377 * @delay: jiffies to delay the work queuing
2378 *
2379 * Return value:
2380 * 1 on success / 0 already queued / < 0 for error
2381 */
2382 static int
2383 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2384 unsigned long delay)
2385 {
2386 if (unlikely(!fc_host_devloss_work_q(shost))) {
2387 printk(KERN_ERR
2388 "ERROR: FC host '%s' attempted to queue work, "
2389 "when no workqueue created.\n", shost->hostt->name);
2390 dump_stack();
2391
2392 return -EINVAL;
2393 }
2394
2395 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2396 }
2397
2398 /**
2399 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2400 * @shost: Pointer to Scsi_Host bound to fc_host.
2401 */
2402 static void
2403 fc_flush_devloss(struct Scsi_Host *shost)
2404 {
2405 if (!fc_host_devloss_work_q(shost)) {
2406 printk(KERN_ERR
2407 "ERROR: FC host '%s' attempted to flush work, "
2408 "when no workqueue created.\n", shost->hostt->name);
2409 dump_stack();
2410 return;
2411 }
2412
2413 flush_workqueue(fc_host_devloss_work_q(shost));
2414 }
2415
2416
2417 /**
2418 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2419 * @shost: Which &Scsi_Host
2420 *
2421 * This routine is expected to be called immediately preceding the
2422 * a driver's call to scsi_remove_host().
2423 *
2424 * WARNING: A driver utilizing the fc_transport, which fails to call
2425 * this routine prior to scsi_remove_host(), will leave dangling
2426 * objects in /sys/class/fc_remote_ports. Access to any of these
2427 * objects can result in a system crash !!!
2428 *
2429 * Notes:
2430 * This routine assumes no locks are held on entry.
2431 */
2432 void
2433 fc_remove_host(struct Scsi_Host *shost)
2434 {
2435 struct fc_vport *vport = NULL, *next_vport = NULL;
2436 struct fc_rport *rport = NULL, *next_rport = NULL;
2437 struct workqueue_struct *work_q;
2438 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2439 unsigned long flags;
2440
2441 spin_lock_irqsave(shost->host_lock, flags);
2442
2443 /* Remove any vports */
2444 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2445 fc_queue_work(shost, &vport->vport_delete_work);
2446
2447 /* Remove any remote ports */
2448 list_for_each_entry_safe(rport, next_rport,
2449 &fc_host->rports, peers) {
2450 list_del(&rport->peers);
2451 rport->port_state = FC_PORTSTATE_DELETED;
2452 fc_queue_work(shost, &rport->rport_delete_work);
2453 }
2454
2455 list_for_each_entry_safe(rport, next_rport,
2456 &fc_host->rport_bindings, peers) {
2457 list_del(&rport->peers);
2458 rport->port_state = FC_PORTSTATE_DELETED;
2459 fc_queue_work(shost, &rport->rport_delete_work);
2460 }
2461
2462 spin_unlock_irqrestore(shost->host_lock, flags);
2463
2464 /* flush all scan work items */
2465 scsi_flush_work(shost);
2466
2467 /* flush all stgt delete, and rport delete work items, then kill it */
2468 if (fc_host->work_q) {
2469 work_q = fc_host->work_q;
2470 fc_host->work_q = NULL;
2471 destroy_workqueue(work_q);
2472 }
2473
2474 /* flush all devloss work items, then kill it */
2475 if (fc_host->devloss_work_q) {
2476 work_q = fc_host->devloss_work_q;
2477 fc_host->devloss_work_q = NULL;
2478 destroy_workqueue(work_q);
2479 }
2480 }
2481 EXPORT_SYMBOL(fc_remove_host);
2482
2483 static void fc_terminate_rport_io(struct fc_rport *rport)
2484 {
2485 struct Scsi_Host *shost = rport_to_shost(rport);
2486 struct fc_internal *i = to_fc_internal(shost->transportt);
2487
2488 /* Involve the LLDD if possible to terminate all io on the rport. */
2489 if (i->f->terminate_rport_io)
2490 i->f->terminate_rport_io(rport);
2491
2492 /*
2493 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2494 */
2495 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2496 }
2497
2498 /**
2499 * fc_starget_delete - called to delete the scsi descendants of an rport
2500 * @work: remote port to be operated on.
2501 *
2502 * Deletes target and all sdevs.
2503 */
2504 static void
2505 fc_starget_delete(struct work_struct *work)
2506 {
2507 struct fc_rport *rport =
2508 container_of(work, struct fc_rport, stgt_delete_work);
2509
2510 fc_terminate_rport_io(rport);
2511 scsi_remove_target(&rport->dev);
2512 }
2513
2514
2515 /**
2516 * fc_rport_final_delete - finish rport termination and delete it.
2517 * @work: remote port to be deleted.
2518 */
2519 static void
2520 fc_rport_final_delete(struct work_struct *work)
2521 {
2522 struct fc_rport *rport =
2523 container_of(work, struct fc_rport, rport_delete_work);
2524 struct device *dev = &rport->dev;
2525 struct Scsi_Host *shost = rport_to_shost(rport);
2526 struct fc_internal *i = to_fc_internal(shost->transportt);
2527 unsigned long flags;
2528 int do_callback = 0;
2529
2530 fc_terminate_rport_io(rport);
2531
2532 /*
2533 * if a scan is pending, flush the SCSI Host work_q so that
2534 * that we can reclaim the rport scan work element.
2535 */
2536 if (rport->flags & FC_RPORT_SCAN_PENDING)
2537 scsi_flush_work(shost);
2538
2539 /*
2540 * Cancel any outstanding timers. These should really exist
2541 * only when rmmod'ing the LLDD and we're asking for
2542 * immediate termination of the rports
2543 */
2544 spin_lock_irqsave(shost->host_lock, flags);
2545 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2546 spin_unlock_irqrestore(shost->host_lock, flags);
2547 if (!cancel_delayed_work(&rport->fail_io_work))
2548 fc_flush_devloss(shost);
2549 if (!cancel_delayed_work(&rport->dev_loss_work))
2550 fc_flush_devloss(shost);
2551 spin_lock_irqsave(shost->host_lock, flags);
2552 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2553 }
2554 spin_unlock_irqrestore(shost->host_lock, flags);
2555
2556 /* Delete SCSI target and sdevs */
2557 if (rport->scsi_target_id != -1)
2558 fc_starget_delete(&rport->stgt_delete_work);
2559
2560 /*
2561 * Notify the driver that the rport is now dead. The LLDD will
2562 * also guarantee that any communication to the rport is terminated
2563 *
2564 * Avoid this call if we already called it when we preserved the
2565 * rport for the binding.
2566 */
2567 spin_lock_irqsave(shost->host_lock, flags);
2568 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2569 (i->f->dev_loss_tmo_callbk)) {
2570 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2571 do_callback = 1;
2572 }
2573 spin_unlock_irqrestore(shost->host_lock, flags);
2574
2575 if (do_callback)
2576 i->f->dev_loss_tmo_callbk(rport);
2577
2578 fc_bsg_remove(rport->rqst_q);
2579
2580 transport_remove_device(dev);
2581 device_del(dev);
2582 transport_destroy_device(dev);
2583 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2584 put_device(dev); /* for self-reference */
2585 }
2586
2587
2588 /**
2589 * fc_rport_create - allocates and creates a remote FC port.
2590 * @shost: scsi host the remote port is connected to.
2591 * @channel: Channel on shost port connected to.
2592 * @ids: The world wide names, fc address, and FC4 port
2593 * roles for the remote port.
2594 *
2595 * Allocates and creates the remoter port structure, including the
2596 * class and sysfs creation.
2597 *
2598 * Notes:
2599 * This routine assumes no locks are held on entry.
2600 */
2601 static struct fc_rport *
2602 fc_rport_create(struct Scsi_Host *shost, int channel,
2603 struct fc_rport_identifiers *ids)
2604 {
2605 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2606 struct fc_internal *fci = to_fc_internal(shost->transportt);
2607 struct fc_rport *rport;
2608 struct device *dev;
2609 unsigned long flags;
2610 int error;
2611 size_t size;
2612
2613 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2614 rport = kzalloc(size, GFP_KERNEL);
2615 if (unlikely(!rport)) {
2616 printk(KERN_ERR "%s: allocation failure\n", __func__);
2617 return NULL;
2618 }
2619
2620 rport->maxframe_size = -1;
2621 rport->supported_classes = FC_COS_UNSPECIFIED;
2622 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2623 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2624 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2625 rport->port_id = ids->port_id;
2626 rport->roles = ids->roles;
2627 rport->port_state = FC_PORTSTATE_ONLINE;
2628 if (fci->f->dd_fcrport_size)
2629 rport->dd_data = &rport[1];
2630 rport->channel = channel;
2631 rport->fast_io_fail_tmo = -1;
2632
2633 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2634 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2635 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2636 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2637 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2638
2639 spin_lock_irqsave(shost->host_lock, flags);
2640
2641 rport->number = fc_host->next_rport_number++;
2642 if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2643 rport->scsi_target_id = fc_host->next_target_id++;
2644 else
2645 rport->scsi_target_id = -1;
2646 list_add_tail(&rport->peers, &fc_host->rports);
2647 get_device(&shost->shost_gendev); /* for fc_host->rport list */
2648
2649 spin_unlock_irqrestore(shost->host_lock, flags);
2650
2651 dev = &rport->dev;
2652 device_initialize(dev); /* takes self reference */
2653 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2654 dev->release = fc_rport_dev_release;
2655 dev_set_name(dev, "rport-%d:%d-%d",
2656 shost->host_no, channel, rport->number);
2657 transport_setup_device(dev);
2658
2659 error = device_add(dev);
2660 if (error) {
2661 printk(KERN_ERR "FC Remote Port device_add failed\n");
2662 goto delete_rport;
2663 }
2664 transport_add_device(dev);
2665 transport_configure_device(dev);
2666
2667 fc_bsg_rportadd(shost, rport);
2668 /* ignore any bsg add error - we just can't do sgio */
2669
2670 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2671 /* initiate a scan of the target */
2672 rport->flags |= FC_RPORT_SCAN_PENDING;
2673 scsi_queue_work(shost, &rport->scan_work);
2674 }
2675
2676 return rport;
2677
2678 delete_rport:
2679 transport_destroy_device(dev);
2680 spin_lock_irqsave(shost->host_lock, flags);
2681 list_del(&rport->peers);
2682 put_device(&shost->shost_gendev); /* for fc_host->rport list */
2683 spin_unlock_irqrestore(shost->host_lock, flags);
2684 put_device(dev->parent);
2685 kfree(rport);
2686 return NULL;
2687 }
2688
2689 /**
2690 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2691 * @shost: scsi host the remote port is connected to.
2692 * @channel: Channel on shost port connected to.
2693 * @ids: The world wide names, fc address, and FC4 port
2694 * roles for the remote port.
2695 *
2696 * The LLDD calls this routine to notify the transport of the existence
2697 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2698 * of the port, it's FC address (port_id), and the FC4 roles that are
2699 * active for the port.
2700 *
2701 * For ports that are FCP targets (aka scsi targets), the FC transport
2702 * maintains consistent target id bindings on behalf of the LLDD.
2703 * A consistent target id binding is an assignment of a target id to
2704 * a remote port identifier, which persists while the scsi host is
2705 * attached. The remote port can disappear, then later reappear, and
2706 * it's target id assignment remains the same. This allows for shifts
2707 * in FC addressing (if binding by wwpn or wwnn) with no apparent
2708 * changes to the scsi subsystem which is based on scsi host number and
2709 * target id values. Bindings are only valid during the attachment of
2710 * the scsi host. If the host detaches, then later re-attaches, target
2711 * id bindings may change.
2712 *
2713 * This routine is responsible for returning a remote port structure.
2714 * The routine will search the list of remote ports it maintains
2715 * internally on behalf of consistent target id mappings. If found, the
2716 * remote port structure will be reused. Otherwise, a new remote port
2717 * structure will be allocated.
2718 *
2719 * Whenever a remote port is allocated, a new fc_remote_port class
2720 * device is created.
2721 *
2722 * Should not be called from interrupt context.
2723 *
2724 * Notes:
2725 * This routine assumes no locks are held on entry.
2726 */
2727 struct fc_rport *
2728 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2729 struct fc_rport_identifiers *ids)
2730 {
2731 struct fc_internal *fci = to_fc_internal(shost->transportt);
2732 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2733 struct fc_rport *rport;
2734 unsigned long flags;
2735 int match = 0;
2736
2737 /* ensure any stgt delete functions are done */
2738 fc_flush_work(shost);
2739
2740 /*
2741 * Search the list of "active" rports, for an rport that has been
2742 * deleted, but we've held off the real delete while the target
2743 * is in a "blocked" state.
2744 */
2745 spin_lock_irqsave(shost->host_lock, flags);
2746
2747 list_for_each_entry(rport, &fc_host->rports, peers) {
2748
2749 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2750 (rport->channel == channel)) {
2751
2752 switch (fc_host->tgtid_bind_type) {
2753 case FC_TGTID_BIND_BY_WWPN:
2754 case FC_TGTID_BIND_NONE:
2755 if (rport->port_name == ids->port_name)
2756 match = 1;
2757 break;
2758 case FC_TGTID_BIND_BY_WWNN:
2759 if (rport->node_name == ids->node_name)
2760 match = 1;
2761 break;
2762 case FC_TGTID_BIND_BY_ID:
2763 if (rport->port_id == ids->port_id)
2764 match = 1;
2765 break;
2766 }
2767
2768 if (match) {
2769
2770 memcpy(&rport->node_name, &ids->node_name,
2771 sizeof(rport->node_name));
2772 memcpy(&rport->port_name, &ids->port_name,
2773 sizeof(rport->port_name));
2774 rport->port_id = ids->port_id;
2775
2776 rport->port_state = FC_PORTSTATE_ONLINE;
2777 rport->roles = ids->roles;
2778
2779 spin_unlock_irqrestore(shost->host_lock, flags);
2780
2781 if (fci->f->dd_fcrport_size)
2782 memset(rport->dd_data, 0,
2783 fci->f->dd_fcrport_size);
2784
2785 /*
2786 * If we were not a target, cancel the
2787 * io terminate and rport timers, and
2788 * we're done.
2789 *
2790 * If we were a target, but our new role
2791 * doesn't indicate a target, leave the
2792 * timers running expecting the role to
2793 * change as the target fully logs in. If
2794 * it doesn't, the target will be torn down.
2795 *
2796 * If we were a target, and our role shows
2797 * we're still a target, cancel the timers
2798 * and kick off a scan.
2799 */
2800
2801 /* was a target, not in roles */
2802 if ((rport->scsi_target_id != -1) &&
2803 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2804 return rport;
2805
2806 /*
2807 * Stop the fail io and dev_loss timers.
2808 * If they flush, the port_state will
2809 * be checked and will NOOP the function.
2810 */
2811 if (!cancel_delayed_work(&rport->fail_io_work))
2812 fc_flush_devloss(shost);
2813 if (!cancel_delayed_work(&rport->dev_loss_work))
2814 fc_flush_devloss(shost);
2815
2816 spin_lock_irqsave(shost->host_lock, flags);
2817
2818 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2819 FC_RPORT_DEVLOSS_PENDING |
2820 FC_RPORT_DEVLOSS_CALLBK_DONE);
2821
2822 spin_unlock_irqrestore(shost->host_lock, flags);
2823
2824 /* if target, initiate a scan */
2825 if (rport->scsi_target_id != -1) {
2826 scsi_target_unblock(&rport->dev,
2827 SDEV_RUNNING);
2828 spin_lock_irqsave(shost->host_lock,
2829 flags);
2830 rport->flags |= FC_RPORT_SCAN_PENDING;
2831 scsi_queue_work(shost,
2832 &rport->scan_work);
2833 spin_unlock_irqrestore(shost->host_lock,
2834 flags);
2835 }
2836
2837 fc_bsg_goose_queue(rport);
2838
2839 return rport;
2840 }
2841 }
2842 }
2843
2844 /*
2845 * Search the bindings array
2846 * Note: if never a FCP target, you won't be on this list
2847 */
2848 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2849
2850 /* search for a matching consistent binding */
2851
2852 list_for_each_entry(rport, &fc_host->rport_bindings,
2853 peers) {
2854 if (rport->channel != channel)
2855 continue;
2856
2857 switch (fc_host->tgtid_bind_type) {
2858 case FC_TGTID_BIND_BY_WWPN:
2859 if (rport->port_name == ids->port_name)
2860 match = 1;
2861 break;
2862 case FC_TGTID_BIND_BY_WWNN:
2863 if (rport->node_name == ids->node_name)
2864 match = 1;
2865 break;
2866 case FC_TGTID_BIND_BY_ID:
2867 if (rport->port_id == ids->port_id)
2868 match = 1;
2869 break;
2870 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2871 break;
2872 }
2873
2874 if (match) {
2875 list_move_tail(&rport->peers, &fc_host->rports);
2876 break;
2877 }
2878 }
2879
2880 if (match) {
2881 memcpy(&rport->node_name, &ids->node_name,
2882 sizeof(rport->node_name));
2883 memcpy(&rport->port_name, &ids->port_name,
2884 sizeof(rport->port_name));
2885 rport->port_id = ids->port_id;
2886 rport->roles = ids->roles;
2887 rport->port_state = FC_PORTSTATE_ONLINE;
2888 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2889
2890 if (fci->f->dd_fcrport_size)
2891 memset(rport->dd_data, 0,
2892 fci->f->dd_fcrport_size);
2893 spin_unlock_irqrestore(shost->host_lock, flags);
2894
2895 if (ids->roles & FC_PORT_ROLE_FCP_TARGET) {
2896 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
2897
2898 /* initiate a scan of the target */
2899 spin_lock_irqsave(shost->host_lock, flags);
2900 rport->flags |= FC_RPORT_SCAN_PENDING;
2901 scsi_queue_work(shost, &rport->scan_work);
2902 spin_unlock_irqrestore(shost->host_lock, flags);
2903 }
2904 return rport;
2905 }
2906 }
2907
2908 spin_unlock_irqrestore(shost->host_lock, flags);
2909
2910 /* No consistent binding found - create new remote port entry */
2911 rport = fc_rport_create(shost, channel, ids);
2912
2913 return rport;
2914 }
2915 EXPORT_SYMBOL(fc_remote_port_add);
2916
2917
2918 /**
2919 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2920 * @rport: The remote port that no longer exists
2921 *
2922 * The LLDD calls this routine to notify the transport that a remote
2923 * port is no longer part of the topology. Note: Although a port
2924 * may no longer be part of the topology, it may persist in the remote
2925 * ports displayed by the fc_host. We do this under 2 conditions:
2926 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2927 * This allows the port to temporarily disappear, then reappear without
2928 * disrupting the SCSI device tree attached to it. During the "blocked"
2929 * period the port will still exist.
2930 * 2) If the port was a scsi target and disappears for longer than we
2931 * expect, we'll delete the port and the tear down the SCSI device tree
2932 * attached to it. However, we want to semi-persist the target id assigned
2933 * to that port if it eventually does exist. The port structure will
2934 * remain (although with minimal information) so that the target id
2935 * bindings remails.
2936 *
2937 * If the remote port is not an FCP Target, it will be fully torn down
2938 * and deallocated, including the fc_remote_port class device.
2939 *
2940 * If the remote port is an FCP Target, the port will be placed in a
2941 * temporary blocked state. From the LLDD's perspective, the rport no
2942 * longer exists. From the SCSI midlayer's perspective, the SCSI target
2943 * exists, but all sdevs on it are blocked from further I/O. The following
2944 * is then expected.
2945 *
2946 * If the remote port does not return (signaled by a LLDD call to
2947 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2948 * scsi target is removed - killing all outstanding i/o and removing the
2949 * scsi devices attached ot it. The port structure will be marked Not
2950 * Present and be partially cleared, leaving only enough information to
2951 * recognize the remote port relative to the scsi target id binding if
2952 * it later appears. The port will remain as long as there is a valid
2953 * binding (e.g. until the user changes the binding type or unloads the
2954 * scsi host with the binding).
2955 *
2956 * If the remote port returns within the dev_loss_tmo value (and matches
2957 * according to the target id binding type), the port structure will be
2958 * reused. If it is no longer a SCSI target, the target will be torn
2959 * down. If it continues to be a SCSI target, then the target will be
2960 * unblocked (allowing i/o to be resumed), and a scan will be activated
2961 * to ensure that all luns are detected.
2962 *
2963 * Called from normal process context only - cannot be called from interrupt.
2964 *
2965 * Notes:
2966 * This routine assumes no locks are held on entry.
2967 */
2968 void
2969 fc_remote_port_delete(struct fc_rport *rport)
2970 {
2971 struct Scsi_Host *shost = rport_to_shost(rport);
2972 unsigned long timeout = rport->dev_loss_tmo;
2973 unsigned long flags;
2974
2975 /*
2976 * No need to flush the fc_host work_q's, as all adds are synchronous.
2977 *
2978 * We do need to reclaim the rport scan work element, so eventually
2979 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2980 * there's still a scan pending.
2981 */
2982
2983 spin_lock_irqsave(shost->host_lock, flags);
2984
2985 if (rport->port_state != FC_PORTSTATE_ONLINE) {
2986 spin_unlock_irqrestore(shost->host_lock, flags);
2987 return;
2988 }
2989
2990 /*
2991 * In the past, we if this was not an FCP-Target, we would
2992 * unconditionally just jump to deleting the rport.
2993 * However, rports can be used as node containers by the LLDD,
2994 * and its not appropriate to just terminate the rport at the
2995 * first sign of a loss in connectivity. The LLDD may want to
2996 * send ELS traffic to re-validate the login. If the rport is
2997 * immediately deleted, it makes it inappropriate for a node
2998 * container.
2999 * So... we now unconditionally wait dev_loss_tmo before
3000 * destroying an rport.
3001 */
3002
3003 rport->port_state = FC_PORTSTATE_BLOCKED;
3004
3005 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3006
3007 spin_unlock_irqrestore(shost->host_lock, flags);
3008
3009 if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
3010 shost->active_mode & MODE_TARGET)
3011 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
3012
3013 scsi_target_block(&rport->dev);
3014
3015 /* see if we need to kill io faster than waiting for device loss */
3016 if ((rport->fast_io_fail_tmo != -1) &&
3017 (rport->fast_io_fail_tmo < timeout))
3018 fc_queue_devloss_work(shost, &rport->fail_io_work,
3019 rport->fast_io_fail_tmo * HZ);
3020
3021 /* cap the length the devices can be blocked until they are deleted */
3022 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3023 }
3024 EXPORT_SYMBOL(fc_remote_port_delete);
3025
3026 /**
3027 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3028 * @rport: The remote port that changed.
3029 * @roles: New roles for this port.
3030 *
3031 * Description: The LLDD calls this routine to notify the transport that the
3032 * roles on a remote port may have changed. The largest effect of this is
3033 * if a port now becomes a FCP Target, it must be allocated a
3034 * scsi target id. If the port is no longer a FCP target, any
3035 * scsi target id value assigned to it will persist in case the
3036 * role changes back to include FCP Target. No changes in the scsi
3037 * midlayer will be invoked if the role changes (in the expectation
3038 * that the role will be resumed. If it doesn't normal error processing
3039 * will take place).
3040 *
3041 * Should not be called from interrupt context.
3042 *
3043 * Notes:
3044 * This routine assumes no locks are held on entry.
3045 */
3046 void
3047 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3048 {
3049 struct Scsi_Host *shost = rport_to_shost(rport);
3050 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3051 unsigned long flags;
3052 int create = 0;
3053 int ret;
3054
3055 spin_lock_irqsave(shost->host_lock, flags);
3056 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3057 if (rport->scsi_target_id == -1) {
3058 rport->scsi_target_id = fc_host->next_target_id++;
3059 create = 1;
3060 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3061 create = 1;
3062 } else if (shost->active_mode & MODE_TARGET) {
3063 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
3064 (char *)&rport->node_name);
3065 if (ret)
3066 printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
3067 ret);
3068 }
3069
3070 rport->roles = roles;
3071
3072 spin_unlock_irqrestore(shost->host_lock, flags);
3073
3074 if (create) {
3075 /*
3076 * There may have been a delete timer running on the
3077 * port. Ensure that it is cancelled as we now know
3078 * the port is an FCP Target.
3079 * Note: we know the rport is exists and in an online
3080 * state as the LLDD would not have had an rport
3081 * reference to pass us.
3082 *
3083 * Take no action on the del_timer failure as the state
3084 * machine state change will validate the
3085 * transaction.
3086 */
3087 if (!cancel_delayed_work(&rport->fail_io_work))
3088 fc_flush_devloss(shost);
3089 if (!cancel_delayed_work(&rport->dev_loss_work))
3090 fc_flush_devloss(shost);
3091
3092 spin_lock_irqsave(shost->host_lock, flags);
3093 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3094 FC_RPORT_DEVLOSS_PENDING |
3095 FC_RPORT_DEVLOSS_CALLBK_DONE);
3096 spin_unlock_irqrestore(shost->host_lock, flags);
3097
3098 /* ensure any stgt delete functions are done */
3099 fc_flush_work(shost);
3100
3101 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3102 /* initiate a scan of the target */
3103 spin_lock_irqsave(shost->host_lock, flags);
3104 rport->flags |= FC_RPORT_SCAN_PENDING;
3105 scsi_queue_work(shost, &rport->scan_work);
3106 spin_unlock_irqrestore(shost->host_lock, flags);
3107 }
3108 }
3109 EXPORT_SYMBOL(fc_remote_port_rolechg);
3110
3111 /**
3112 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3113 * @work: rport target that failed to reappear in the allotted time.
3114 *
3115 * Description: An attempt to delete a remote port blocks, and if it fails
3116 * to return in the allotted time this gets called.
3117 */
3118 static void
3119 fc_timeout_deleted_rport(struct work_struct *work)
3120 {
3121 struct fc_rport *rport =
3122 container_of(work, struct fc_rport, dev_loss_work.work);
3123 struct Scsi_Host *shost = rport_to_shost(rport);
3124 struct fc_internal *i = to_fc_internal(shost->transportt);
3125 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3126 unsigned long flags;
3127 int do_callback = 0;
3128
3129 spin_lock_irqsave(shost->host_lock, flags);
3130
3131 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3132
3133 /*
3134 * If the port is ONLINE, then it came back. If it was a SCSI
3135 * target, validate it still is. If not, tear down the
3136 * scsi_target on it.
3137 */
3138 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3139 (rport->scsi_target_id != -1) &&
3140 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3141 dev_printk(KERN_ERR, &rport->dev,
3142 "blocked FC remote port time out: no longer"
3143 " a FCP target, removing starget\n");
3144 spin_unlock_irqrestore(shost->host_lock, flags);
3145 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3146 fc_queue_work(shost, &rport->stgt_delete_work);
3147 return;
3148 }
3149
3150 /* NOOP state - we're flushing workq's */
3151 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3152 spin_unlock_irqrestore(shost->host_lock, flags);
3153 dev_printk(KERN_ERR, &rport->dev,
3154 "blocked FC remote port time out: leaving"
3155 " rport%s alone\n",
3156 (rport->scsi_target_id != -1) ? " and starget" : "");
3157 return;
3158 }
3159
3160 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3161 (rport->scsi_target_id == -1)) {
3162 list_del(&rport->peers);
3163 rport->port_state = FC_PORTSTATE_DELETED;
3164 dev_printk(KERN_ERR, &rport->dev,
3165 "blocked FC remote port time out: removing"
3166 " rport%s\n",
3167 (rport->scsi_target_id != -1) ? " and starget" : "");
3168 fc_queue_work(shost, &rport->rport_delete_work);
3169 spin_unlock_irqrestore(shost->host_lock, flags);
3170 return;
3171 }
3172
3173 dev_printk(KERN_ERR, &rport->dev,
3174 "blocked FC remote port time out: removing target and "
3175 "saving binding\n");
3176
3177 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3178
3179 /*
3180 * Note: We do not remove or clear the hostdata area. This allows
3181 * host-specific target data to persist along with the
3182 * scsi_target_id. It's up to the host to manage it's hostdata area.
3183 */
3184
3185 /*
3186 * Reinitialize port attributes that may change if the port comes back.
3187 */
3188 rport->maxframe_size = -1;
3189 rport->supported_classes = FC_COS_UNSPECIFIED;
3190 rport->roles = FC_PORT_ROLE_UNKNOWN;
3191 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3192 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3193
3194 /*
3195 * Pre-emptively kill I/O rather than waiting for the work queue
3196 * item to teardown the starget. (FCOE libFC folks prefer this
3197 * and to have the rport_port_id still set when it's done).
3198 */
3199 spin_unlock_irqrestore(shost->host_lock, flags);
3200 fc_terminate_rport_io(rport);
3201
3202 spin_lock_irqsave(shost->host_lock, flags);
3203
3204 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3205
3206 /* remove the identifiers that aren't used in the consisting binding */
3207 switch (fc_host->tgtid_bind_type) {
3208 case FC_TGTID_BIND_BY_WWPN:
3209 rport->node_name = -1;
3210 rport->port_id = -1;
3211 break;
3212 case FC_TGTID_BIND_BY_WWNN:
3213 rport->port_name = -1;
3214 rport->port_id = -1;
3215 break;
3216 case FC_TGTID_BIND_BY_ID:
3217 rport->node_name = -1;
3218 rport->port_name = -1;
3219 break;
3220 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3221 break;
3222 }
3223
3224 /*
3225 * As this only occurs if the remote port (scsi target)
3226 * went away and didn't come back - we'll remove
3227 * all attached scsi devices.
3228 */
3229 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3230 fc_queue_work(shost, &rport->stgt_delete_work);
3231
3232 do_callback = 1;
3233 }
3234
3235 spin_unlock_irqrestore(shost->host_lock, flags);
3236
3237 /*
3238 * Notify the driver that the rport is now dead. The LLDD will
3239 * also guarantee that any communication to the rport is terminated
3240 *
3241 * Note: we set the CALLBK_DONE flag above to correspond
3242 */
3243 if (do_callback && i->f->dev_loss_tmo_callbk)
3244 i->f->dev_loss_tmo_callbk(rport);
3245 }
3246
3247
3248 /**
3249 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3250 * @work: rport to terminate io on.
3251 *
3252 * Notes: Only requests the failure of the io, not that all are flushed
3253 * prior to returning.
3254 */
3255 static void
3256 fc_timeout_fail_rport_io(struct work_struct *work)
3257 {
3258 struct fc_rport *rport =
3259 container_of(work, struct fc_rport, fail_io_work.work);
3260
3261 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3262 return;
3263
3264 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3265 fc_terminate_rport_io(rport);
3266 }
3267
3268 /**
3269 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3270 * @work: remote port to be scanned.
3271 */
3272 static void
3273 fc_scsi_scan_rport(struct work_struct *work)
3274 {
3275 struct fc_rport *rport =
3276 container_of(work, struct fc_rport, scan_work);
3277 struct Scsi_Host *shost = rport_to_shost(rport);
3278 struct fc_internal *i = to_fc_internal(shost->transportt);
3279 unsigned long flags;
3280
3281 if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3282 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3283 !(i->f->disable_target_scan)) {
3284 scsi_scan_target(&rport->dev, rport->channel,
3285 rport->scsi_target_id, SCAN_WILD_CARD, 1);
3286 }
3287
3288 spin_lock_irqsave(shost->host_lock, flags);
3289 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3290 spin_unlock_irqrestore(shost->host_lock, flags);
3291 }
3292
3293 /**
3294 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3295 * @cmnd: SCSI command that scsi_eh is trying to recover
3296 *
3297 * This routine can be called from a FC LLD scsi_eh callback. It
3298 * blocks the scsi_eh thread until the fc_rport leaves the
3299 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3300 * necessary to avoid the scsi_eh failing recovery actions for blocked
3301 * rports which would lead to offlined SCSI devices.
3302 *
3303 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3304 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3305 * passed back to scsi_eh.
3306 */
3307 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3308 {
3309 struct Scsi_Host *shost = cmnd->device->host;
3310 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3311 unsigned long flags;
3312
3313 spin_lock_irqsave(shost->host_lock, flags);
3314 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3315 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3316 spin_unlock_irqrestore(shost->host_lock, flags);
3317 msleep(1000);
3318 spin_lock_irqsave(shost->host_lock, flags);
3319 }
3320 spin_unlock_irqrestore(shost->host_lock, flags);
3321
3322 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3323 return FAST_IO_FAIL;
3324
3325 return 0;
3326 }
3327 EXPORT_SYMBOL(fc_block_scsi_eh);
3328
3329 /**
3330 * fc_vport_setup - allocates and creates a FC virtual port.
3331 * @shost: scsi host the virtual port is connected to.
3332 * @channel: Channel on shost port connected to.
3333 * @pdev: parent device for vport
3334 * @ids: The world wide names, FC4 port roles, etc for
3335 * the virtual port.
3336 * @ret_vport: The pointer to the created vport.
3337 *
3338 * Allocates and creates the vport structure, calls the parent host
3339 * to instantiate the vport, the completes w/ class and sysfs creation.
3340 *
3341 * Notes:
3342 * This routine assumes no locks are held on entry.
3343 */
3344 static int
3345 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3346 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3347 {
3348 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3349 struct fc_internal *fci = to_fc_internal(shost->transportt);
3350 struct fc_vport *vport;
3351 struct device *dev;
3352 unsigned long flags;
3353 size_t size;
3354 int error;
3355
3356 *ret_vport = NULL;
3357
3358 if ( ! fci->f->vport_create)
3359 return -ENOENT;
3360
3361 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3362 vport = kzalloc(size, GFP_KERNEL);
3363 if (unlikely(!vport)) {
3364 printk(KERN_ERR "%s: allocation failure\n", __func__);
3365 return -ENOMEM;
3366 }
3367
3368 vport->vport_state = FC_VPORT_UNKNOWN;
3369 vport->vport_last_state = FC_VPORT_UNKNOWN;
3370 vport->node_name = ids->node_name;
3371 vport->port_name = ids->port_name;
3372 vport->roles = ids->roles;
3373 vport->vport_type = ids->vport_type;
3374 if (fci->f->dd_fcvport_size)
3375 vport->dd_data = &vport[1];
3376 vport->shost = shost;
3377 vport->channel = channel;
3378 vport->flags = FC_VPORT_CREATING;
3379 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3380
3381 spin_lock_irqsave(shost->host_lock, flags);
3382
3383 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3384 spin_unlock_irqrestore(shost->host_lock, flags);
3385 kfree(vport);
3386 return -ENOSPC;
3387 }
3388 fc_host->npiv_vports_inuse++;
3389 vport->number = fc_host->next_vport_number++;
3390 list_add_tail(&vport->peers, &fc_host->vports);
3391 get_device(&shost->shost_gendev); /* for fc_host->vport list */
3392
3393 spin_unlock_irqrestore(shost->host_lock, flags);
3394
3395 dev = &vport->dev;
3396 device_initialize(dev); /* takes self reference */
3397 dev->parent = get_device(pdev); /* takes parent reference */
3398 dev->release = fc_vport_dev_release;
3399 dev_set_name(dev, "vport-%d:%d-%d",
3400 shost->host_no, channel, vport->number);
3401 transport_setup_device(dev);
3402
3403 error = device_add(dev);
3404 if (error) {
3405 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3406 goto delete_vport;
3407 }
3408 transport_add_device(dev);
3409 transport_configure_device(dev);
3410
3411 error = fci->f->vport_create(vport, ids->disable);
3412 if (error) {
3413 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3414 goto delete_vport_all;
3415 }
3416
3417 /*
3418 * if the parent isn't the physical adapter's Scsi_Host, ensure
3419 * the Scsi_Host at least contains ia symlink to the vport.
3420 */
3421 if (pdev != &shost->shost_gendev) {
3422 error = sysfs_create_link(&shost->shost_gendev.kobj,
3423 &dev->kobj, dev_name(dev));
3424 if (error)
3425 printk(KERN_ERR
3426 "%s: Cannot create vport symlinks for "
3427 "%s, err=%d\n",
3428 __func__, dev_name(dev), error);
3429 }
3430 spin_lock_irqsave(shost->host_lock, flags);
3431 vport->flags &= ~FC_VPORT_CREATING;
3432 spin_unlock_irqrestore(shost->host_lock, flags);
3433
3434 dev_printk(KERN_NOTICE, pdev,
3435 "%s created via shost%d channel %d\n", dev_name(dev),
3436 shost->host_no, channel);
3437
3438 *ret_vport = vport;
3439
3440 return 0;
3441
3442 delete_vport_all:
3443 transport_remove_device(dev);
3444 device_del(dev);
3445 delete_vport:
3446 transport_destroy_device(dev);
3447 spin_lock_irqsave(shost->host_lock, flags);
3448 list_del(&vport->peers);
3449 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3450 fc_host->npiv_vports_inuse--;
3451 spin_unlock_irqrestore(shost->host_lock, flags);
3452 put_device(dev->parent);
3453 kfree(vport);
3454
3455 return error;
3456 }
3457
3458 /**
3459 * fc_vport_create - Admin App or LLDD requests creation of a vport
3460 * @shost: scsi host the virtual port is connected to.
3461 * @channel: channel on shost port connected to.
3462 * @ids: The world wide names, FC4 port roles, etc for
3463 * the virtual port.
3464 *
3465 * Notes:
3466 * This routine assumes no locks are held on entry.
3467 */
3468 struct fc_vport *
3469 fc_vport_create(struct Scsi_Host *shost, int channel,
3470 struct fc_vport_identifiers *ids)
3471 {
3472 int stat;
3473 struct fc_vport *vport;
3474
3475 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3476 ids, &vport);
3477 return stat ? NULL : vport;
3478 }
3479 EXPORT_SYMBOL(fc_vport_create);
3480
3481 /**
3482 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3483 * @vport: fc_vport to be terminated
3484 *
3485 * Calls the LLDD vport_delete() function, then deallocates and removes
3486 * the vport from the shost and object tree.
3487 *
3488 * Notes:
3489 * This routine assumes no locks are held on entry.
3490 */
3491 int
3492 fc_vport_terminate(struct fc_vport *vport)
3493 {
3494 struct Scsi_Host *shost = vport_to_shost(vport);
3495 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3496 struct fc_internal *i = to_fc_internal(shost->transportt);
3497 struct device *dev = &vport->dev;
3498 unsigned long flags;
3499 int stat;
3500
3501 if (i->f->vport_delete)
3502 stat = i->f->vport_delete(vport);
3503 else
3504 stat = -ENOENT;
3505
3506 spin_lock_irqsave(shost->host_lock, flags);
3507 vport->flags &= ~FC_VPORT_DELETING;
3508 if (!stat) {
3509 vport->flags |= FC_VPORT_DELETED;
3510 list_del(&vport->peers);
3511 fc_host->npiv_vports_inuse--;
3512 put_device(&shost->shost_gendev); /* for fc_host->vport list */
3513 }
3514 spin_unlock_irqrestore(shost->host_lock, flags);
3515
3516 if (stat)
3517 return stat;
3518
3519 if (dev->parent != &shost->shost_gendev)
3520 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3521 transport_remove_device(dev);
3522 device_del(dev);
3523 transport_destroy_device(dev);
3524
3525 /*
3526 * Removing our self-reference should mean our
3527 * release function gets called, which will drop the remaining
3528 * parent reference and free the data structure.
3529 */
3530 put_device(dev); /* for self-reference */
3531
3532 return 0; /* SUCCESS */
3533 }
3534 EXPORT_SYMBOL(fc_vport_terminate);
3535
3536 /**
3537 * fc_vport_sched_delete - workq-based delete request for a vport
3538 * @work: vport to be deleted.
3539 */
3540 static void
3541 fc_vport_sched_delete(struct work_struct *work)
3542 {
3543 struct fc_vport *vport =
3544 container_of(work, struct fc_vport, vport_delete_work);
3545 int stat;
3546
3547 stat = fc_vport_terminate(vport);
3548 if (stat)
3549 dev_printk(KERN_ERR, vport->dev.parent,
3550 "%s: %s could not be deleted created via "
3551 "shost%d channel %d - error %d\n", __func__,
3552 dev_name(&vport->dev), vport->shost->host_no,
3553 vport->channel, stat);
3554 }
3555
3556
3557 /*
3558 * BSG support
3559 */
3560
3561
3562 /**
3563 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3564 * @job: fc_bsg_job that is to be torn down
3565 */
3566 static void
3567 fc_destroy_bsgjob(struct fc_bsg_job *job)
3568 {
3569 unsigned long flags;
3570
3571 spin_lock_irqsave(&job->job_lock, flags);
3572 if (job->ref_cnt) {
3573 spin_unlock_irqrestore(&job->job_lock, flags);
3574 return;
3575 }
3576 spin_unlock_irqrestore(&job->job_lock, flags);
3577
3578 put_device(job->dev); /* release reference for the request */
3579
3580 kfree(job->request_payload.sg_list);
3581 kfree(job->reply_payload.sg_list);
3582 kfree(job);
3583 }
3584
3585 /**
3586 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3587 * completed
3588 * @job: fc_bsg_job that is complete
3589 */
3590 static void
3591 fc_bsg_jobdone(struct fc_bsg_job *job)
3592 {
3593 struct request *req = job->req;
3594 struct request *rsp = req->next_rq;
3595 int err;
3596
3597 err = job->req->errors = job->reply->result;
3598
3599 if (err < 0)
3600 /* we're only returning the result field in the reply */
3601 job->req->sense_len = sizeof(uint32_t);
3602 else
3603 job->req->sense_len = job->reply_len;
3604
3605 /* we assume all request payload was transferred, residual == 0 */
3606 req->resid_len = 0;
3607
3608 if (rsp) {
3609 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3610
3611 /* set reply (bidi) residual */
3612 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3613 rsp->resid_len);
3614 }
3615 blk_complete_request(req);
3616 }
3617
3618 /**
3619 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3620 * @rq: BSG request that holds the job to be destroyed
3621 */
3622 static void fc_bsg_softirq_done(struct request *rq)
3623 {
3624 struct fc_bsg_job *job = rq->special;
3625 unsigned long flags;
3626
3627 spin_lock_irqsave(&job->job_lock, flags);
3628 job->state_flags |= FC_RQST_STATE_DONE;
3629 job->ref_cnt--;
3630 spin_unlock_irqrestore(&job->job_lock, flags);
3631
3632 blk_end_request_all(rq, rq->errors);
3633 fc_destroy_bsgjob(job);
3634 }
3635
3636 /**
3637 * fc_bsg_job_timeout - handler for when a bsg request timesout
3638 * @req: request that timed out
3639 */
3640 static enum blk_eh_timer_return
3641 fc_bsg_job_timeout(struct request *req)
3642 {
3643 struct fc_bsg_job *job = (void *) req->special;
3644 struct Scsi_Host *shost = job->shost;
3645 struct fc_internal *i = to_fc_internal(shost->transportt);
3646 unsigned long flags;
3647 int err = 0, done = 0;
3648
3649 if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3650 return BLK_EH_RESET_TIMER;
3651
3652 spin_lock_irqsave(&job->job_lock, flags);
3653 if (job->state_flags & FC_RQST_STATE_DONE)
3654 done = 1;
3655 else
3656 job->ref_cnt++;
3657 spin_unlock_irqrestore(&job->job_lock, flags);
3658
3659 if (!done && i->f->bsg_timeout) {
3660 /* call LLDD to abort the i/o as it has timed out */
3661 err = i->f->bsg_timeout(job);
3662 if (err == -EAGAIN) {
3663 job->ref_cnt--;
3664 return BLK_EH_RESET_TIMER;
3665 } else if (err)
3666 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3667 "abort failed with status %d\n", err);
3668 }
3669
3670 /* the blk_end_sync_io() doesn't check the error */
3671 if (done)
3672 return BLK_EH_NOT_HANDLED;
3673 else
3674 return BLK_EH_HANDLED;
3675 }
3676
3677 static int
3678 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3679 {
3680 size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3681
3682 BUG_ON(!req->nr_phys_segments);
3683
3684 buf->sg_list = kzalloc(sz, GFP_KERNEL);
3685 if (!buf->sg_list)
3686 return -ENOMEM;
3687 sg_init_table(buf->sg_list, req->nr_phys_segments);
3688 buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3689 buf->payload_len = blk_rq_bytes(req);
3690 return 0;
3691 }
3692
3693
3694 /**
3695 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3696 * bsg request
3697 * @shost: SCSI Host corresponding to the bsg object
3698 * @rport: (optional) FC Remote Port corresponding to the bsg object
3699 * @req: BSG request that needs a job structure
3700 */
3701 static int
3702 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3703 struct request *req)
3704 {
3705 struct fc_internal *i = to_fc_internal(shost->transportt);
3706 struct request *rsp = req->next_rq;
3707 struct fc_bsg_job *job;
3708 int ret;
3709
3710 BUG_ON(req->special);
3711
3712 job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3713 GFP_KERNEL);
3714 if (!job)
3715 return -ENOMEM;
3716
3717 /*
3718 * Note: this is a bit silly.
3719 * The request gets formatted as a SGIO v4 ioctl request, which
3720 * then gets reformatted as a blk request, which then gets
3721 * reformatted as a fc bsg request. And on completion, we have
3722 * to wrap return results such that SGIO v4 thinks it was a scsi
3723 * status. I hope this was all worth it.
3724 */
3725
3726 req->special = job;
3727 job->shost = shost;
3728 job->rport = rport;
3729 job->req = req;
3730 if (i->f->dd_bsg_size)
3731 job->dd_data = (void *)&job[1];
3732 spin_lock_init(&job->job_lock);
3733 job->request = (struct fc_bsg_request *)req->cmd;
3734 job->request_len = req->cmd_len;
3735 job->reply = req->sense;
3736 job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3737 * allocated */
3738 if (req->bio) {
3739 ret = fc_bsg_map_buffer(&job->request_payload, req);
3740 if (ret)
3741 goto failjob_rls_job;
3742 }
3743 if (rsp && rsp->bio) {
3744 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3745 if (ret)
3746 goto failjob_rls_rqst_payload;
3747 }
3748 job->job_done = fc_bsg_jobdone;
3749 if (rport)
3750 job->dev = &rport->dev;
3751 else
3752 job->dev = &shost->shost_gendev;
3753 get_device(job->dev); /* take a reference for the request */
3754
3755 job->ref_cnt = 1;
3756
3757 return 0;
3758
3759
3760 failjob_rls_rqst_payload:
3761 kfree(job->request_payload.sg_list);
3762 failjob_rls_job:
3763 kfree(job);
3764 return -ENOMEM;
3765 }
3766
3767
3768 enum fc_dispatch_result {
3769 FC_DISPATCH_BREAK, /* on return, q is locked, break from q loop */
3770 FC_DISPATCH_LOCKED, /* on return, q is locked, continue on */
3771 FC_DISPATCH_UNLOCKED, /* on return, q is unlocked, continue on */
3772 };
3773
3774
3775 /**
3776 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3777 * @q: fc host request queue
3778 * @shost: scsi host rport attached to
3779 * @job: bsg job to be processed
3780 */
3781 static enum fc_dispatch_result
3782 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3783 struct fc_bsg_job *job)
3784 {
3785 struct fc_internal *i = to_fc_internal(shost->transportt);
3786 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3787 int ret;
3788
3789 /* Validate the host command */
3790 switch (job->request->msgcode) {
3791 case FC_BSG_HST_ADD_RPORT:
3792 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3793 break;
3794
3795 case FC_BSG_HST_DEL_RPORT:
3796 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3797 break;
3798
3799 case FC_BSG_HST_ELS_NOLOGIN:
3800 cmdlen += sizeof(struct fc_bsg_host_els);
3801 /* there better be a xmt and rcv payloads */
3802 if ((!job->request_payload.payload_len) ||
3803 (!job->reply_payload.payload_len)) {
3804 ret = -EINVAL;
3805 goto fail_host_msg;
3806 }
3807 break;
3808
3809 case FC_BSG_HST_CT:
3810 cmdlen += sizeof(struct fc_bsg_host_ct);
3811 /* there better be xmt and rcv payloads */
3812 if ((!job->request_payload.payload_len) ||
3813 (!job->reply_payload.payload_len)) {
3814 ret = -EINVAL;
3815 goto fail_host_msg;
3816 }
3817 break;
3818
3819 case FC_BSG_HST_VENDOR:
3820 cmdlen += sizeof(struct fc_bsg_host_vendor);
3821 if ((shost->hostt->vendor_id == 0L) ||
3822 (job->request->rqst_data.h_vendor.vendor_id !=
3823 shost->hostt->vendor_id)) {
3824 ret = -ESRCH;
3825 goto fail_host_msg;
3826 }
3827 break;
3828
3829 default:
3830 ret = -EBADR;
3831 goto fail_host_msg;
3832 }
3833
3834 /* check if we really have all the request data needed */
3835 if (job->request_len < cmdlen) {
3836 ret = -ENOMSG;
3837 goto fail_host_msg;
3838 }
3839
3840 ret = i->f->bsg_request(job);
3841 if (!ret)
3842 return FC_DISPATCH_UNLOCKED;
3843
3844 fail_host_msg:
3845 /* return the errno failure code as the only status */
3846 BUG_ON(job->reply_len < sizeof(uint32_t));
3847 job->reply->reply_payload_rcv_len = 0;
3848 job->reply->result = ret;
3849 job->reply_len = sizeof(uint32_t);
3850 fc_bsg_jobdone(job);
3851 return FC_DISPATCH_UNLOCKED;
3852 }
3853
3854
3855 /*
3856 * fc_bsg_goose_queue - restart rport queue in case it was stopped
3857 * @rport: rport to be restarted
3858 */
3859 static void
3860 fc_bsg_goose_queue(struct fc_rport *rport)
3861 {
3862 if (!rport->rqst_q)
3863 return;
3864
3865 /*
3866 * This get/put dance makes no sense
3867 */
3868 get_device(&rport->dev);
3869 blk_run_queue_async(rport->rqst_q);
3870 put_device(&rport->dev);
3871 }
3872
3873 /**
3874 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3875 * @q: rport request queue
3876 * @shost: scsi host rport attached to
3877 * @rport: rport request destined to
3878 * @job: bsg job to be processed
3879 */
3880 static enum fc_dispatch_result
3881 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3882 struct fc_rport *rport, struct fc_bsg_job *job)
3883 {
3884 struct fc_internal *i = to_fc_internal(shost->transportt);
3885 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
3886 int ret;
3887
3888 /* Validate the rport command */
3889 switch (job->request->msgcode) {
3890 case FC_BSG_RPT_ELS:
3891 cmdlen += sizeof(struct fc_bsg_rport_els);
3892 goto check_bidi;
3893
3894 case FC_BSG_RPT_CT:
3895 cmdlen += sizeof(struct fc_bsg_rport_ct);
3896 check_bidi:
3897 /* there better be xmt and rcv payloads */
3898 if ((!job->request_payload.payload_len) ||
3899 (!job->reply_payload.payload_len)) {
3900 ret = -EINVAL;
3901 goto fail_rport_msg;
3902 }
3903 break;
3904 default:
3905 ret = -EBADR;
3906 goto fail_rport_msg;
3907 }
3908
3909 /* check if we really have all the request data needed */
3910 if (job->request_len < cmdlen) {
3911 ret = -ENOMSG;
3912 goto fail_rport_msg;
3913 }
3914
3915 ret = i->f->bsg_request(job);
3916 if (!ret)
3917 return FC_DISPATCH_UNLOCKED;
3918
3919 fail_rport_msg:
3920 /* return the errno failure code as the only status */
3921 BUG_ON(job->reply_len < sizeof(uint32_t));
3922 job->reply->reply_payload_rcv_len = 0;
3923 job->reply->result = ret;
3924 job->reply_len = sizeof(uint32_t);
3925 fc_bsg_jobdone(job);
3926 return FC_DISPATCH_UNLOCKED;
3927 }
3928
3929
3930 /**
3931 * fc_bsg_request_handler - generic handler for bsg requests
3932 * @q: request queue to manage
3933 * @shost: Scsi_Host related to the bsg object
3934 * @rport: FC remote port related to the bsg object (optional)
3935 * @dev: device structure for bsg object
3936 */
3937 static void
3938 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3939 struct fc_rport *rport, struct device *dev)
3940 {
3941 struct request *req;
3942 struct fc_bsg_job *job;
3943 enum fc_dispatch_result ret;
3944
3945 if (!get_device(dev))
3946 return;
3947
3948 while (1) {
3949 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3950 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3951 break;
3952
3953 req = blk_fetch_request(q);
3954 if (!req)
3955 break;
3956
3957 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3958 req->errors = -ENXIO;
3959 spin_unlock_irq(q->queue_lock);
3960 blk_end_request_all(req, -ENXIO);
3961 spin_lock_irq(q->queue_lock);
3962 continue;
3963 }
3964
3965 spin_unlock_irq(q->queue_lock);
3966
3967 ret = fc_req_to_bsgjob(shost, rport, req);
3968 if (ret) {
3969 req->errors = ret;
3970 blk_end_request_all(req, ret);
3971 spin_lock_irq(q->queue_lock);
3972 continue;
3973 }
3974
3975 job = req->special;
3976
3977 /* check if we have the msgcode value at least */
3978 if (job->request_len < sizeof(uint32_t)) {
3979 BUG_ON(job->reply_len < sizeof(uint32_t));
3980 job->reply->reply_payload_rcv_len = 0;
3981 job->reply->result = -ENOMSG;
3982 job->reply_len = sizeof(uint32_t);
3983 fc_bsg_jobdone(job);
3984 spin_lock_irq(q->queue_lock);
3985 continue;
3986 }
3987
3988 /* the dispatch routines will unlock the queue_lock */
3989 if (rport)
3990 ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3991 else
3992 ret = fc_bsg_host_dispatch(q, shost, job);
3993
3994 /* did dispatcher hit state that can't process any more */
3995 if (ret == FC_DISPATCH_BREAK)
3996 break;
3997
3998 /* did dispatcher had released the lock */
3999 if (ret == FC_DISPATCH_UNLOCKED)
4000 spin_lock_irq(q->queue_lock);
4001 }
4002
4003 spin_unlock_irq(q->queue_lock);
4004 put_device(dev);
4005 spin_lock_irq(q->queue_lock);
4006 }
4007
4008
4009 /**
4010 * fc_bsg_host_handler - handler for bsg requests for a fc host
4011 * @q: fc host request queue
4012 */
4013 static void
4014 fc_bsg_host_handler(struct request_queue *q)
4015 {
4016 struct Scsi_Host *shost = q->queuedata;
4017
4018 fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
4019 }
4020
4021
4022 /**
4023 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
4024 * @q: rport request queue
4025 */
4026 static void
4027 fc_bsg_rport_handler(struct request_queue *q)
4028 {
4029 struct fc_rport *rport = q->queuedata;
4030 struct Scsi_Host *shost = rport_to_shost(rport);
4031
4032 fc_bsg_request_handler(q, shost, rport, &rport->dev);
4033 }
4034
4035
4036 /**
4037 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4038 * @shost: shost for fc_host
4039 * @fc_host: fc_host adding the structures to
4040 */
4041 static int
4042 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4043 {
4044 struct device *dev = &shost->shost_gendev;
4045 struct fc_internal *i = to_fc_internal(shost->transportt);
4046 struct request_queue *q;
4047 int err;
4048 char bsg_name[20];
4049
4050 fc_host->rqst_q = NULL;
4051
4052 if (!i->f->bsg_request)
4053 return -ENOTSUPP;
4054
4055 snprintf(bsg_name, sizeof(bsg_name),
4056 "fc_host%d", shost->host_no);
4057
4058 q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4059 if (!q) {
4060 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4061 "initialize - no request queue\n",
4062 shost->host_no);
4063 return -ENOMEM;
4064 }
4065
4066 q->queuedata = shost;
4067 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4068 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4069 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4070 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4071
4072 err = bsg_register_queue(q, dev, bsg_name, NULL);
4073 if (err) {
4074 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4075 "initialize - register queue\n",
4076 shost->host_no);
4077 blk_cleanup_queue(q);
4078 return err;
4079 }
4080
4081 fc_host->rqst_q = q;
4082 return 0;
4083 }
4084
4085
4086 /**
4087 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4088 * @shost: shost that rport is attached to
4089 * @rport: rport that the bsg hooks are being attached to
4090 */
4091 static int
4092 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4093 {
4094 struct device *dev = &rport->dev;
4095 struct fc_internal *i = to_fc_internal(shost->transportt);
4096 struct request_queue *q;
4097 int err;
4098
4099 rport->rqst_q = NULL;
4100
4101 if (!i->f->bsg_request)
4102 return -ENOTSUPP;
4103
4104 q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4105 if (!q) {
4106 printk(KERN_ERR "%s: bsg interface failed to "
4107 "initialize - no request queue\n",
4108 dev->kobj.name);
4109 return -ENOMEM;
4110 }
4111
4112 q->queuedata = rport;
4113 queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4114 blk_queue_softirq_done(q, fc_bsg_softirq_done);
4115 blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4116 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4117
4118 err = bsg_register_queue(q, dev, NULL, NULL);
4119 if (err) {
4120 printk(KERN_ERR "%s: bsg interface failed to "
4121 "initialize - register queue\n",
4122 dev->kobj.name);
4123 blk_cleanup_queue(q);
4124 return err;
4125 }
4126
4127 rport->rqst_q = q;
4128 return 0;
4129 }
4130
4131
4132 /**
4133 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4134 * @q: the request_queue that is to be torn down.
4135 *
4136 * Notes:
4137 * Before unregistering the queue empty any requests that are blocked
4138 *
4139 *
4140 */
4141 static void
4142 fc_bsg_remove(struct request_queue *q)
4143 {
4144 if (q) {
4145 bsg_unregister_queue(q);
4146 blk_cleanup_queue(q);
4147 }
4148 }
4149
4150
4151 /* Original Author: Martin Hicks */
4152 MODULE_AUTHOR("James Smart");
4153 MODULE_DESCRIPTION("FC Transport Attributes");
4154 MODULE_LICENSE("GPL");
4155
4156 module_init(fc_transport_init);
4157 module_exit(fc_transport_exit);
kernel source for telekom puls (alcatel/mediatek)