1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * FiberChannel transport specific attributes exported to sysfs.
4 *
5 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
6 * Copyright (C) 2004-2007 James Smart, Emulex Corporation
7 * Rewrite for host, target, device, and remote port attributes,
8 * statistics, and service functions...
9 * Add vports, etc
10 */
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/delay.h>
15 #include <linux/kernel.h>
16 #include <linux/bsg-lib.h>
17 #include <scsi/scsi_device.h>
18 #include <scsi/scsi_host.h>
19 #include <scsi/scsi_transport.h>
20 #include <scsi/scsi_transport_fc.h>
21 #include <scsi/scsi_cmnd.h>
22 #include <net/netlink.h>
23 #include <scsi/scsi_netlink_fc.h>
24 #include <scsi/scsi_bsg_fc.h>
25 #include <uapi/scsi/fc/fc_els.h>
26 #include "scsi_priv.h"
27
28 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
29 static void fc_vport_sched_delete(struct work_struct *work);
30 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
31 struct device *pdev, struct fc_vport_identifiers *ids,
32 struct fc_vport **vport);
33 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
34 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
35 static void fc_bsg_remove(struct request_queue *);
36 static void fc_bsg_goose_queue(struct fc_rport *);
37 static void fc_li_stats_update(u16 event_type,
38 struct fc_fpin_stats *stats);
39 static void fc_delivery_stats_update(u32 reason_code,
40 struct fc_fpin_stats *stats);
41 static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
42
43 /*
44 * Module Parameters
45 */
46
47 /*
48 * dev_loss_tmo: the default number of seconds that the FC transport
49 * should insulate the loss of a remote port.
50 * The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
51 */
52 static unsigned int fc_dev_loss_tmo = 60; /* seconds */
53
54 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
55 MODULE_PARM_DESC(dev_loss_tmo,
56 "Maximum number of seconds that the FC transport should"
57 " insulate the loss of a remote port. Once this value is"
58 " exceeded, the scsi target is removed. Value should be"
59 " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
60 " fast_io_fail_tmo is not set.");
61
62 /*
63 * Redefine so that we can have same named attributes in the
64 * sdev/starget/host objects.
65 */
66 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
67 struct device_attribute device_attr_##_prefix##_##_name = \
68 __ATTR(_name,_mode,_show,_store)
69
70 #define fc_enum_name_search(title, table_type, table) \
71 static const char *get_fc_##title##_name(enum table_type table_key) \
72 { \
73 int i; \
74 char *name = NULL; \
75 \
76 for (i = 0; i < ARRAY_SIZE(table); i++) { \
77 if (table[i].value == table_key) { \
78 name = table[i].name; \
79 break; \
80 } \
81 } \
82 return name; \
83 }
84
85 #define fc_enum_name_match(title, table_type, table) \
86 static int get_fc_##title##_match(const char *table_key, \
87 enum table_type *value) \
88 { \
89 int i; \
90 \
91 for (i = 0; i < ARRAY_SIZE(table); i++) { \
92 if (strncmp(table_key, table[i].name, \
93 table[i].matchlen) == 0) { \
94 *value = table[i].value; \
95 return 0; /* success */ \
96 } \
97 } \
98 return 1; /* failure */ \
99 }
100
101
102 /* Convert fc_port_type values to ascii string name */
103 static struct {
104 enum fc_port_type value;
105 char *name;
106 } fc_port_type_names[] = {
107 { FC_PORTTYPE_UNKNOWN, "Unknown" },
108 { FC_PORTTYPE_OTHER, "Other" },
109 { FC_PORTTYPE_NOTPRESENT, "Not Present" },
110 { FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
111 { FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
112 { FC_PORTTYPE_LPORT, "LPort (private loop)" },
113 { FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
114 { FC_PORTTYPE_NPIV, "NPIV VPORT" },
115 };
116 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
117 #define FC_PORTTYPE_MAX_NAMELEN 50
118
119 /* Reuse fc_port_type enum function for vport_type */
120 #define get_fc_vport_type_name get_fc_port_type_name
121
122
123 /* Convert fc_host_event_code values to ascii string name */
124 static const struct {
125 enum fc_host_event_code value;
126 char *name;
127 } fc_host_event_code_names[] = {
128 { FCH_EVT_LIP, "lip" },
129 { FCH_EVT_LINKUP, "link_up" },
130 { FCH_EVT_LINKDOWN, "link_down" },
131 { FCH_EVT_LIPRESET, "lip_reset" },
132 { FCH_EVT_RSCN, "rscn" },
133 { FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
134 { FCH_EVT_PORT_UNKNOWN, "port_unknown" },
135 { FCH_EVT_PORT_ONLINE, "port_online" },
136 { FCH_EVT_PORT_OFFLINE, "port_offline" },
137 { FCH_EVT_PORT_FABRIC, "port_fabric" },
138 { FCH_EVT_LINK_UNKNOWN, "link_unknown" },
139 { FCH_EVT_LINK_FPIN, "link_FPIN" },
140 { FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
141 };
142 fc_enum_name_search(host_event_code, fc_host_event_code,
143 fc_host_event_code_names)
144 #define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
145
146
147 /* Convert fc_port_state values to ascii string name */
148 static struct {
149 enum fc_port_state value;
150 char *name;
151 int matchlen;
152 } fc_port_state_names[] = {
153 { FC_PORTSTATE_UNKNOWN, "Unknown", 7},
154 { FC_PORTSTATE_NOTPRESENT, "Not Present", 11 },
155 { FC_PORTSTATE_ONLINE, "Online", 6 },
156 { FC_PORTSTATE_OFFLINE, "Offline", 7 },
157 { FC_PORTSTATE_BLOCKED, "Blocked", 7 },
158 { FC_PORTSTATE_BYPASSED, "Bypassed", 8 },
159 { FC_PORTSTATE_DIAGNOSTICS, "Diagnostics", 11 },
160 { FC_PORTSTATE_LINKDOWN, "Linkdown", 8 },
161 { FC_PORTSTATE_ERROR, "Error", 5 },
162 { FC_PORTSTATE_LOOPBACK, "Loopback", 8 },
163 { FC_PORTSTATE_DELETED, "Deleted", 7 },
164 { FC_PORTSTATE_MARGINAL, "Marginal", 8 },
165 };
166 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
167 fc_enum_name_match(port_state, fc_port_state, fc_port_state_names)
168 #define FC_PORTSTATE_MAX_NAMELEN 20
169
170
171 /* Convert fc_vport_state values to ascii string name */
172 static struct {
173 enum fc_vport_state value;
174 char *name;
175 } fc_vport_state_names[] = {
176 { FC_VPORT_UNKNOWN, "Unknown" },
177 { FC_VPORT_ACTIVE, "Active" },
178 { FC_VPORT_DISABLED, "Disabled" },
179 { FC_VPORT_LINKDOWN, "Linkdown" },
180 { FC_VPORT_INITIALIZING, "Initializing" },
181 { FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
182 { FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
183 { FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
184 { FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
185 { FC_VPORT_FAILED, "VPort Failed" },
186 };
187 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
188 #define FC_VPORTSTATE_MAX_NAMELEN 24
189
190 /* Reuse fc_vport_state enum function for vport_last_state */
191 #define get_fc_vport_last_state_name get_fc_vport_state_name
192
193
194 /* Convert fc_tgtid_binding_type values to ascii string name */
195 static const struct {
196 enum fc_tgtid_binding_type value;
197 char *name;
198 int matchlen;
199 } fc_tgtid_binding_type_names[] = {
200 { FC_TGTID_BIND_NONE, "none", 4 },
201 { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
202 { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
203 { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
204 };
205 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
206 fc_tgtid_binding_type_names)
207 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
208 fc_tgtid_binding_type_names)
209 #define FC_BINDTYPE_MAX_NAMELEN 30
210
211
212 #define fc_bitfield_name_search(title, table) \
213 static ssize_t \
214 get_fc_##title##_names(u32 table_key, char *buf) \
215 { \
216 char *prefix = ""; \
217 ssize_t len = 0; \
218 int i; \
219 \
220 for (i = 0; i < ARRAY_SIZE(table); i++) { \
221 if (table[i].value & table_key) { \
222 len += sprintf(buf + len, "%s%s", \
223 prefix, table[i].name); \
224 prefix = ", "; \
225 } \
226 } \
227 len += sprintf(buf + len, "\n"); \
228 return len; \
229 }
230
231
232 /* Convert FC_COS bit values to ascii string name */
233 static const struct {
234 u32 value;
235 char *name;
236 } fc_cos_names[] = {
237 { FC_COS_CLASS1, "Class 1" },
238 { FC_COS_CLASS2, "Class 2" },
239 { FC_COS_CLASS3, "Class 3" },
240 { FC_COS_CLASS4, "Class 4" },
241 { FC_COS_CLASS6, "Class 6" },
242 };
243 fc_bitfield_name_search(cos, fc_cos_names)
244
245
246 /* Convert FC_PORTSPEED bit values to ascii string name */
247 static const struct {
248 u32 value;
249 char *name;
250 } fc_port_speed_names[] = {
251 { FC_PORTSPEED_1GBIT, "1 Gbit" },
252 { FC_PORTSPEED_2GBIT, "2 Gbit" },
253 { FC_PORTSPEED_4GBIT, "4 Gbit" },
254 { FC_PORTSPEED_10GBIT, "10 Gbit" },
255 { FC_PORTSPEED_8GBIT, "8 Gbit" },
256 { FC_PORTSPEED_16GBIT, "16 Gbit" },
257 { FC_PORTSPEED_32GBIT, "32 Gbit" },
258 { FC_PORTSPEED_20GBIT, "20 Gbit" },
259 { FC_PORTSPEED_40GBIT, "40 Gbit" },
260 { FC_PORTSPEED_50GBIT, "50 Gbit" },
261 { FC_PORTSPEED_100GBIT, "100 Gbit" },
262 { FC_PORTSPEED_25GBIT, "25 Gbit" },
263 { FC_PORTSPEED_64GBIT, "64 Gbit" },
264 { FC_PORTSPEED_128GBIT, "128 Gbit" },
265 { FC_PORTSPEED_256GBIT, "256 Gbit" },
266 { FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
267 };
fc_bitfield_name_search(port_speed,fc_port_speed_names)268 fc_bitfield_name_search(port_speed, fc_port_speed_names)
269
270
271 static int
272 show_fc_fc4s (char *buf, u8 *fc4_list)
273 {
274 int i, len=0;
275
276 for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
277 len += sprintf(buf + len , "0x%02x ", *fc4_list);
278 len += sprintf(buf + len, "\n");
279 return len;
280 }
281
282
283 /* Convert FC_PORT_ROLE bit values to ascii string name */
284 static const struct {
285 u32 value;
286 char *name;
287 } fc_port_role_names[] = {
288 { FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
289 { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
290 { FC_PORT_ROLE_IP_PORT, "IP Port" },
291 { FC_PORT_ROLE_FCP_DUMMY_INITIATOR, "FCP Dummy Initiator" },
292 { FC_PORT_ROLE_NVME_INITIATOR, "NVMe Initiator" },
293 { FC_PORT_ROLE_NVME_TARGET, "NVMe Target" },
294 { FC_PORT_ROLE_NVME_DISCOVERY, "NVMe Discovery" },
295 };
296 fc_bitfield_name_search(port_roles, fc_port_role_names)
297
298 /*
299 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
300 */
301 #define FC_WELLKNOWN_PORTID_MASK 0xfffff0
302 #define FC_WELLKNOWN_ROLE_MASK 0x00000f
303 #define FC_FPORT_PORTID 0x00000e
304 #define FC_FABCTLR_PORTID 0x00000d
305 #define FC_DIRSRVR_PORTID 0x00000c
306 #define FC_TIMESRVR_PORTID 0x00000b
307 #define FC_MGMTSRVR_PORTID 0x00000a
308
309
310 static void fc_timeout_deleted_rport(struct work_struct *work);
311 static void fc_timeout_fail_rport_io(struct work_struct *work);
312 static void fc_scsi_scan_rport(struct work_struct *work);
313
314 /*
315 * Attribute counts pre object type...
316 * Increase these values if you add attributes
317 */
318 #define FC_STARGET_NUM_ATTRS 3
319 #define FC_RPORT_NUM_ATTRS 10
320 #define FC_VPORT_NUM_ATTRS 9
321 #define FC_HOST_NUM_ATTRS 29
322
323 struct fc_internal {
324 struct scsi_transport_template t;
325 struct fc_function_template *f;
326
327 /*
328 * For attributes : each object has :
329 * An array of the actual attributes structures
330 * An array of null-terminated pointers to the attribute
331 * structures - used for mid-layer interaction.
332 *
333 * The attribute containers for the starget and host are are
334 * part of the midlayer. As the remote port is specific to the
335 * fc transport, we must provide the attribute container.
336 */
337 struct device_attribute private_starget_attrs[
338 FC_STARGET_NUM_ATTRS];
339 struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
340
341 struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
342 struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
343
344 struct transport_container rport_attr_cont;
345 struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
346 struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
347
348 struct transport_container vport_attr_cont;
349 struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
350 struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
351 };
352
353 #define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
354
fc_target_setup(struct transport_container * tc,struct device * dev,struct device * cdev)355 static int fc_target_setup(struct transport_container *tc, struct device *dev,
356 struct device *cdev)
357 {
358 struct scsi_target *starget = to_scsi_target(dev);
359 struct fc_rport *rport = starget_to_rport(starget);
360
361 /*
362 * if parent is remote port, use values from remote port.
363 * Otherwise, this host uses the fc_transport, but not the
364 * remote port interface. As such, initialize to known non-values.
365 */
366 if (rport) {
367 fc_starget_node_name(starget) = rport->node_name;
368 fc_starget_port_name(starget) = rport->port_name;
369 fc_starget_port_id(starget) = rport->port_id;
370 } else {
371 fc_starget_node_name(starget) = -1;
372 fc_starget_port_name(starget) = -1;
373 fc_starget_port_id(starget) = -1;
374 }
375
376 return 0;
377 }
378
379 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
380 "fc_transport",
381 fc_target_setup,
382 NULL,
383 NULL);
384
fc_host_setup(struct transport_container * tc,struct device * dev,struct device * cdev)385 static int fc_host_setup(struct transport_container *tc, struct device *dev,
386 struct device *cdev)
387 {
388 struct Scsi_Host *shost = dev_to_shost(dev);
389 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
390
391 /*
392 * Set default values easily detected by the midlayer as
393 * failure cases. The scsi lldd is responsible for initializing
394 * all transport attributes to valid values per host.
395 */
396 fc_host->node_name = -1;
397 fc_host->port_name = -1;
398 fc_host->permanent_port_name = -1;
399 fc_host->supported_classes = FC_COS_UNSPECIFIED;
400 memset(fc_host->supported_fc4s, 0,
401 sizeof(fc_host->supported_fc4s));
402 fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
403 fc_host->maxframe_size = -1;
404 fc_host->max_npiv_vports = 0;
405 memset(fc_host->serial_number, 0,
406 sizeof(fc_host->serial_number));
407 memset(fc_host->manufacturer, 0,
408 sizeof(fc_host->manufacturer));
409 memset(fc_host->model, 0,
410 sizeof(fc_host->model));
411 memset(fc_host->model_description, 0,
412 sizeof(fc_host->model_description));
413 memset(fc_host->hardware_version, 0,
414 sizeof(fc_host->hardware_version));
415 memset(fc_host->driver_version, 0,
416 sizeof(fc_host->driver_version));
417 memset(fc_host->firmware_version, 0,
418 sizeof(fc_host->firmware_version));
419 memset(fc_host->optionrom_version, 0,
420 sizeof(fc_host->optionrom_version));
421
422 fc_host->port_id = -1;
423 fc_host->port_type = FC_PORTTYPE_UNKNOWN;
424 fc_host->port_state = FC_PORTSTATE_UNKNOWN;
425 memset(fc_host->active_fc4s, 0,
426 sizeof(fc_host->active_fc4s));
427 fc_host->speed = FC_PORTSPEED_UNKNOWN;
428 fc_host->fabric_name = -1;
429 memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
430 memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
431 memset(&fc_host->fpin_stats, 0, sizeof(fc_host->fpin_stats));
432
433 fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
434
435 INIT_LIST_HEAD(&fc_host->rports);
436 INIT_LIST_HEAD(&fc_host->rport_bindings);
437 INIT_LIST_HEAD(&fc_host->vports);
438 fc_host->next_rport_number = 0;
439 fc_host->next_target_id = 0;
440 fc_host->next_vport_number = 0;
441 fc_host->npiv_vports_inuse = 0;
442
443 snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
444 "fc_wq_%d", shost->host_no);
445 fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
446 if (!fc_host->work_q)
447 return -ENOMEM;
448
449 fc_host->dev_loss_tmo = fc_dev_loss_tmo;
450 snprintf(fc_host->devloss_work_q_name,
451 sizeof(fc_host->devloss_work_q_name),
452 "fc_dl_%d", shost->host_no);
453 fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
454 fc_host->devloss_work_q_name);
455 if (!fc_host->devloss_work_q) {
456 destroy_workqueue(fc_host->work_q);
457 fc_host->work_q = NULL;
458 return -ENOMEM;
459 }
460
461 fc_bsg_hostadd(shost, fc_host);
462 /* ignore any bsg add error - we just can't do sgio */
463
464 return 0;
465 }
466
fc_host_remove(struct transport_container * tc,struct device * dev,struct device * cdev)467 static int fc_host_remove(struct transport_container *tc, struct device *dev,
468 struct device *cdev)
469 {
470 struct Scsi_Host *shost = dev_to_shost(dev);
471 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
472
473 fc_bsg_remove(fc_host->rqst_q);
474 return 0;
475 }
476
477 static DECLARE_TRANSPORT_CLASS(fc_host_class,
478 "fc_host",
479 fc_host_setup,
480 fc_host_remove,
481 NULL);
482
483 /*
484 * Setup and Remove actions for remote ports are handled
485 * in the service functions below.
486 */
487 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
488 "fc_remote_ports",
489 NULL,
490 NULL,
491 NULL);
492
493 /*
494 * Setup and Remove actions for virtual ports are handled
495 * in the service functions below.
496 */
497 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
498 "fc_vports",
499 NULL,
500 NULL,
501 NULL);
502
503 /*
504 * Netlink Infrastructure
505 */
506
507 static atomic_t fc_event_seq;
508
509 /**
510 * fc_get_event_number - Obtain the next sequential FC event number
511 *
512 * Notes:
513 * We could have inlined this, but it would have required fc_event_seq to
514 * be exposed. For now, live with the subroutine call.
515 * Atomic used to avoid lock/unlock...
516 */
517 u32
fc_get_event_number(void)518 fc_get_event_number(void)
519 {
520 return atomic_add_return(1, &fc_event_seq);
521 }
522 EXPORT_SYMBOL(fc_get_event_number);
523
524 /**
525 * fc_host_post_fc_event - routine to do the work of posting an event
526 * on an fc_host.
527 * @shost: host the event occurred on
528 * @event_number: fc event number obtained from get_fc_event_number()
529 * @event_code: fc_host event being posted
530 * @data_len: amount, in bytes, of event data
531 * @data_buf: pointer to event data
532 * @vendor_id: value for Vendor id
533 *
534 * Notes:
535 * This routine assumes no locks are held on entry.
536 */
537 void
fc_host_post_fc_event(struct Scsi_Host * shost,u32 event_number,enum fc_host_event_code event_code,u32 data_len,char * data_buf,u64 vendor_id)538 fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
539 enum fc_host_event_code event_code,
540 u32 data_len, char *data_buf, u64 vendor_id)
541 {
542 struct sk_buff *skb;
543 struct nlmsghdr *nlh;
544 struct fc_nl_event *event;
545 const char *name;
546 u32 len;
547 int err;
548
549 if (!data_buf || data_len < 4)
550 data_len = 0;
551
552 if (!scsi_nl_sock) {
553 err = -ENOENT;
554 goto send_fail;
555 }
556
557 len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
558
559 skb = nlmsg_new(len, GFP_KERNEL);
560 if (!skb) {
561 err = -ENOBUFS;
562 goto send_fail;
563 }
564
565 nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
566 if (!nlh) {
567 err = -ENOBUFS;
568 goto send_fail_skb;
569 }
570 event = nlmsg_data(nlh);
571
572 INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
573 FC_NL_ASYNC_EVENT, len);
574 event->seconds = ktime_get_real_seconds();
575 event->vendor_id = vendor_id;
576 event->host_no = shost->host_no;
577 event->event_datalen = data_len; /* bytes */
578 event->event_num = event_number;
579 event->event_code = event_code;
580 if (data_len)
581 memcpy(&event->event_data, data_buf, data_len);
582
583 nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
584 GFP_KERNEL);
585 return;
586
587 send_fail_skb:
588 kfree_skb(skb);
589 send_fail:
590 name = get_fc_host_event_code_name(event_code);
591 printk(KERN_WARNING
592 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
593 __func__, shost->host_no,
594 (name) ? name : "<unknown>",
595 (data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
596 return;
597 }
598 EXPORT_SYMBOL(fc_host_post_fc_event);
599
600 /**
601 * fc_host_post_event - called to post an even on an fc_host.
602 * @shost: host the event occurred on
603 * @event_number: fc event number obtained from get_fc_event_number()
604 * @event_code: fc_host event being posted
605 * @event_data: 32bits of data for the event being posted
606 *
607 * Notes:
608 * This routine assumes no locks are held on entry.
609 */
610 void
fc_host_post_event(struct Scsi_Host * shost,u32 event_number,enum fc_host_event_code event_code,u32 event_data)611 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
612 enum fc_host_event_code event_code, u32 event_data)
613 {
614 fc_host_post_fc_event(shost, event_number, event_code,
615 (u32)sizeof(u32), (char *)&event_data, 0);
616 }
617 EXPORT_SYMBOL(fc_host_post_event);
618
619
620 /**
621 * fc_host_post_vendor_event - called to post a vendor unique event
622 * on an fc_host
623 * @shost: host the event occurred on
624 * @event_number: fc event number obtained from get_fc_event_number()
625 * @data_len: amount, in bytes, of vendor unique data
626 * @data_buf: pointer to vendor unique data
627 * @vendor_id: Vendor id
628 *
629 * Notes:
630 * This routine assumes no locks are held on entry.
631 */
632 void
fc_host_post_vendor_event(struct Scsi_Host * shost,u32 event_number,u32 data_len,char * data_buf,u64 vendor_id)633 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
634 u32 data_len, char * data_buf, u64 vendor_id)
635 {
636 fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
637 data_len, data_buf, vendor_id);
638 }
639 EXPORT_SYMBOL(fc_host_post_vendor_event);
640
641 /**
642 * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
643 * @shost: host the fc_rport is associated with
644 * @wwpn: wwpn of the fc_rport device
645 *
646 * Notes:
647 * This routine assumes no locks are held on entry.
648 */
649 struct fc_rport *
fc_find_rport_by_wwpn(struct Scsi_Host * shost,u64 wwpn)650 fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
651 {
652 struct fc_rport *rport;
653 unsigned long flags;
654
655 spin_lock_irqsave(shost->host_lock, flags);
656
657 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
658 if (rport->port_state != FC_PORTSTATE_ONLINE)
659 continue;
660
661 if (rport->port_name == wwpn) {
662 spin_unlock_irqrestore(shost->host_lock, flags);
663 return rport;
664 }
665 }
666
667 spin_unlock_irqrestore(shost->host_lock, flags);
668 return NULL;
669 }
670 EXPORT_SYMBOL(fc_find_rport_by_wwpn);
671
672 static void
fc_li_stats_update(u16 event_type,struct fc_fpin_stats * stats)673 fc_li_stats_update(u16 event_type,
674 struct fc_fpin_stats *stats)
675 {
676 stats->li++;
677 switch (event_type) {
678 case FPIN_LI_UNKNOWN:
679 stats->li_failure_unknown++;
680 break;
681 case FPIN_LI_LINK_FAILURE:
682 stats->li_link_failure_count++;
683 break;
684 case FPIN_LI_LOSS_OF_SYNC:
685 stats->li_loss_of_sync_count++;
686 break;
687 case FPIN_LI_LOSS_OF_SIG:
688 stats->li_loss_of_signals_count++;
689 break;
690 case FPIN_LI_PRIM_SEQ_ERR:
691 stats->li_prim_seq_err_count++;
692 break;
693 case FPIN_LI_INVALID_TX_WD:
694 stats->li_invalid_tx_word_count++;
695 break;
696 case FPIN_LI_INVALID_CRC:
697 stats->li_invalid_crc_count++;
698 break;
699 case FPIN_LI_DEVICE_SPEC:
700 stats->li_device_specific++;
701 break;
702 }
703 }
704
705 static void
fc_delivery_stats_update(u32 reason_code,struct fc_fpin_stats * stats)706 fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
707 {
708 stats->dn++;
709 switch (reason_code) {
710 case FPIN_DELI_UNKNOWN:
711 stats->dn_unknown++;
712 break;
713 case FPIN_DELI_TIMEOUT:
714 stats->dn_timeout++;
715 break;
716 case FPIN_DELI_UNABLE_TO_ROUTE:
717 stats->dn_unable_to_route++;
718 break;
719 case FPIN_DELI_DEVICE_SPEC:
720 stats->dn_device_specific++;
721 break;
722 }
723 }
724
725 static void
fc_cn_stats_update(u16 event_type,struct fc_fpin_stats * stats)726 fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
727 {
728 stats->cn++;
729 switch (event_type) {
730 case FPIN_CONGN_CLEAR:
731 stats->cn_clear++;
732 break;
733 case FPIN_CONGN_LOST_CREDIT:
734 stats->cn_lost_credit++;
735 break;
736 case FPIN_CONGN_CREDIT_STALL:
737 stats->cn_credit_stall++;
738 break;
739 case FPIN_CONGN_OVERSUBSCRIPTION:
740 stats->cn_oversubscription++;
741 break;
742 case FPIN_CONGN_DEVICE_SPEC:
743 stats->cn_device_specific++;
744 }
745 }
746
747 /*
748 * fc_fpin_li_stats_update - routine to update Link Integrity
749 * event statistics.
750 * @shost: host the FPIN was received on
751 * @tlv: pointer to link integrity descriptor
752 *
753 */
754 static void
fc_fpin_li_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)755 fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
756 {
757 u8 i;
758 struct fc_rport *rport = NULL;
759 struct fc_rport *attach_rport = NULL;
760 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
761 struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
762 u16 event_type = be16_to_cpu(li_desc->event_type);
763 u64 wwpn;
764
765 rport = fc_find_rport_by_wwpn(shost,
766 be64_to_cpu(li_desc->attached_wwpn));
767 if (rport &&
768 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
769 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
770 attach_rport = rport;
771 fc_li_stats_update(event_type, &attach_rport->fpin_stats);
772 }
773
774 if (be32_to_cpu(li_desc->pname_count) > 0) {
775 for (i = 0;
776 i < be32_to_cpu(li_desc->pname_count);
777 i++) {
778 wwpn = be64_to_cpu(li_desc->pname_list[i]);
779 rport = fc_find_rport_by_wwpn(shost, wwpn);
780 if (rport &&
781 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
782 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
783 if (rport == attach_rport)
784 continue;
785 fc_li_stats_update(event_type,
786 &rport->fpin_stats);
787 }
788 }
789 }
790
791 if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
792 fc_li_stats_update(event_type, &fc_host->fpin_stats);
793 }
794
795 /*
796 * fc_fpin_delivery_stats_update - routine to update Delivery Notification
797 * event statistics.
798 * @shost: host the FPIN was received on
799 * @tlv: pointer to delivery descriptor
800 *
801 */
802 static void
fc_fpin_delivery_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)803 fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
804 struct fc_tlv_desc *tlv)
805 {
806 struct fc_rport *rport = NULL;
807 struct fc_rport *attach_rport = NULL;
808 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
809 struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
810 u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
811
812 rport = fc_find_rport_by_wwpn(shost,
813 be64_to_cpu(dn_desc->attached_wwpn));
814 if (rport &&
815 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
816 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
817 attach_rport = rport;
818 fc_delivery_stats_update(reason_code,
819 &attach_rport->fpin_stats);
820 }
821
822 if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
823 fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
824 }
825
826 /*
827 * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
828 * event statistics.
829 * @shost: host the FPIN was received on
830 * @tlv: pointer to peer congestion descriptor
831 *
832 */
833 static void
fc_fpin_peer_congn_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)834 fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
835 struct fc_tlv_desc *tlv)
836 {
837 u8 i;
838 struct fc_rport *rport = NULL;
839 struct fc_rport *attach_rport = NULL;
840 struct fc_fn_peer_congn_desc *pc_desc =
841 (struct fc_fn_peer_congn_desc *)tlv;
842 u16 event_type = be16_to_cpu(pc_desc->event_type);
843 u64 wwpn;
844
845 rport = fc_find_rport_by_wwpn(shost,
846 be64_to_cpu(pc_desc->attached_wwpn));
847 if (rport &&
848 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
849 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
850 attach_rport = rport;
851 fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
852 }
853
854 if (be32_to_cpu(pc_desc->pname_count) > 0) {
855 for (i = 0;
856 i < be32_to_cpu(pc_desc->pname_count);
857 i++) {
858 wwpn = be64_to_cpu(pc_desc->pname_list[i]);
859 rport = fc_find_rport_by_wwpn(shost, wwpn);
860 if (rport &&
861 (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
862 rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
863 if (rport == attach_rport)
864 continue;
865 fc_cn_stats_update(event_type,
866 &rport->fpin_stats);
867 }
868 }
869 }
870 }
871
872 /*
873 * fc_fpin_congn_stats_update - routine to update Congestion
874 * event statistics.
875 * @shost: host the FPIN was received on
876 * @tlv: pointer to congestion descriptor
877 *
878 */
879 static void
fc_fpin_congn_stats_update(struct Scsi_Host * shost,struct fc_tlv_desc * tlv)880 fc_fpin_congn_stats_update(struct Scsi_Host *shost,
881 struct fc_tlv_desc *tlv)
882 {
883 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
884 struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
885
886 fc_cn_stats_update(be16_to_cpu(congn->event_type),
887 &fc_host->fpin_stats);
888 }
889
890 /**
891 * fc_host_fpin_rcv - routine to process a received FPIN.
892 * @shost: host the FPIN was received on
893 * @fpin_len: length of FPIN payload, in bytes
894 * @fpin_buf: pointer to FPIN payload
895 *
896 * Notes:
897 * This routine assumes no locks are held on entry.
898 */
899 void
fc_host_fpin_rcv(struct Scsi_Host * shost,u32 fpin_len,char * fpin_buf)900 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
901 {
902 struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
903 struct fc_tlv_desc *tlv;
904 u32 desc_cnt = 0, bytes_remain;
905 u32 dtag;
906
907 /* Update Statistics */
908 tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
909 bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
910 bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
911
912 while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
913 bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
914 dtag = be32_to_cpu(tlv->desc_tag);
915 switch (dtag) {
916 case ELS_DTAG_LNK_INTEGRITY:
917 fc_fpin_li_stats_update(shost, tlv);
918 break;
919 case ELS_DTAG_DELIVERY:
920 fc_fpin_delivery_stats_update(shost, tlv);
921 break;
922 case ELS_DTAG_PEER_CONGEST:
923 fc_fpin_peer_congn_stats_update(shost, tlv);
924 break;
925 case ELS_DTAG_CONGESTION:
926 fc_fpin_congn_stats_update(shost, tlv);
927 }
928
929 desc_cnt++;
930 bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
931 tlv = fc_tlv_next_desc(tlv);
932 }
933
934 fc_host_post_fc_event(shost, fc_get_event_number(),
935 FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
936 }
937 EXPORT_SYMBOL(fc_host_fpin_rcv);
938
939
fc_transport_init(void)940 static __init int fc_transport_init(void)
941 {
942 int error;
943
944 atomic_set(&fc_event_seq, 0);
945
946 error = transport_class_register(&fc_host_class);
947 if (error)
948 return error;
949 error = transport_class_register(&fc_vport_class);
950 if (error)
951 goto unreg_host_class;
952 error = transport_class_register(&fc_rport_class);
953 if (error)
954 goto unreg_vport_class;
955 error = transport_class_register(&fc_transport_class);
956 if (error)
957 goto unreg_rport_class;
958 return 0;
959
960 unreg_rport_class:
961 transport_class_unregister(&fc_rport_class);
962 unreg_vport_class:
963 transport_class_unregister(&fc_vport_class);
964 unreg_host_class:
965 transport_class_unregister(&fc_host_class);
966 return error;
967 }
968
fc_transport_exit(void)969 static void __exit fc_transport_exit(void)
970 {
971 transport_class_unregister(&fc_transport_class);
972 transport_class_unregister(&fc_rport_class);
973 transport_class_unregister(&fc_host_class);
974 transport_class_unregister(&fc_vport_class);
975 }
976
977 /*
978 * FC Remote Port Attribute Management
979 */
980
981 #define fc_rport_show_function(field, format_string, sz, cast) \
982 static ssize_t \
983 show_fc_rport_##field (struct device *dev, \
984 struct device_attribute *attr, char *buf) \
985 { \
986 struct fc_rport *rport = transport_class_to_rport(dev); \
987 struct Scsi_Host *shost = rport_to_shost(rport); \
988 struct fc_internal *i = to_fc_internal(shost->transportt); \
989 if ((i->f->get_rport_##field) && \
990 !((rport->port_state == FC_PORTSTATE_BLOCKED) || \
991 (rport->port_state == FC_PORTSTATE_DELETED) || \
992 (rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
993 i->f->get_rport_##field(rport); \
994 return snprintf(buf, sz, format_string, cast rport->field); \
995 }
996
997 #define fc_rport_store_function(field) \
998 static ssize_t \
999 store_fc_rport_##field(struct device *dev, \
1000 struct device_attribute *attr, \
1001 const char *buf, size_t count) \
1002 { \
1003 int val; \
1004 struct fc_rport *rport = transport_class_to_rport(dev); \
1005 struct Scsi_Host *shost = rport_to_shost(rport); \
1006 struct fc_internal *i = to_fc_internal(shost->transportt); \
1007 char *cp; \
1008 if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
1009 (rport->port_state == FC_PORTSTATE_DELETED) || \
1010 (rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
1011 return -EBUSY; \
1012 val = simple_strtoul(buf, &cp, 0); \
1013 if (*cp && (*cp != '\n')) \
1014 return -EINVAL; \
1015 i->f->set_rport_##field(rport, val); \
1016 return count; \
1017 }
1018
1019 #define fc_rport_rd_attr(field, format_string, sz) \
1020 fc_rport_show_function(field, format_string, sz, ) \
1021 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1022 show_fc_rport_##field, NULL)
1023
1024 #define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
1025 fc_rport_show_function(field, format_string, sz, (cast)) \
1026 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1027 show_fc_rport_##field, NULL)
1028
1029 #define fc_rport_rw_attr(field, format_string, sz) \
1030 fc_rport_show_function(field, format_string, sz, ) \
1031 fc_rport_store_function(field) \
1032 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
1033 show_fc_rport_##field, \
1034 store_fc_rport_##field)
1035
1036
1037 #define fc_private_rport_show_function(field, format_string, sz, cast) \
1038 static ssize_t \
1039 show_fc_rport_##field (struct device *dev, \
1040 struct device_attribute *attr, char *buf) \
1041 { \
1042 struct fc_rport *rport = transport_class_to_rport(dev); \
1043 return snprintf(buf, sz, format_string, cast rport->field); \
1044 }
1045
1046 #define fc_private_rport_rd_attr(field, format_string, sz) \
1047 fc_private_rport_show_function(field, format_string, sz, ) \
1048 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1049 show_fc_rport_##field, NULL)
1050
1051 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
1052 fc_private_rport_show_function(field, format_string, sz, (cast)) \
1053 static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1054 show_fc_rport_##field, NULL)
1055
1056
1057 #define fc_private_rport_rd_enum_attr(title, maxlen) \
1058 static ssize_t \
1059 show_fc_rport_##title (struct device *dev, \
1060 struct device_attribute *attr, char *buf) \
1061 { \
1062 struct fc_rport *rport = transport_class_to_rport(dev); \
1063 const char *name; \
1064 name = get_fc_##title##_name(rport->title); \
1065 if (!name) \
1066 return -EINVAL; \
1067 return snprintf(buf, maxlen, "%s\n", name); \
1068 } \
1069 static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
1070 show_fc_rport_##title, NULL)
1071
1072
1073 #define SETUP_RPORT_ATTRIBUTE_RD(field) \
1074 i->private_rport_attrs[count] = device_attr_rport_##field; \
1075 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1076 i->private_rport_attrs[count].store = NULL; \
1077 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1078 if (i->f->show_rport_##field) \
1079 count++
1080
1081 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
1082 i->private_rport_attrs[count] = device_attr_rport_##field; \
1083 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1084 i->private_rport_attrs[count].store = NULL; \
1085 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1086 count++
1087
1088 #define SETUP_RPORT_ATTRIBUTE_RW(field) \
1089 i->private_rport_attrs[count] = device_attr_rport_##field; \
1090 if (!i->f->set_rport_##field) { \
1091 i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1092 i->private_rport_attrs[count].store = NULL; \
1093 } \
1094 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1095 if (i->f->show_rport_##field) \
1096 count++
1097
1098 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
1099 { \
1100 i->private_rport_attrs[count] = device_attr_rport_##field; \
1101 i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1102 count++; \
1103 }
1104
1105
1106 /* The FC Transport Remote Port Attributes: */
1107
1108 /* Fixed Remote Port Attributes */
1109
1110 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
1111
1112 static ssize_t
show_fc_rport_supported_classes(struct device * dev,struct device_attribute * attr,char * buf)1113 show_fc_rport_supported_classes (struct device *dev,
1114 struct device_attribute *attr, char *buf)
1115 {
1116 struct fc_rport *rport = transport_class_to_rport(dev);
1117 if (rport->supported_classes == FC_COS_UNSPECIFIED)
1118 return snprintf(buf, 20, "unspecified\n");
1119 return get_fc_cos_names(rport->supported_classes, buf);
1120 }
1121 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
1122 show_fc_rport_supported_classes, NULL);
1123
1124 /* Dynamic Remote Port Attributes */
1125
1126 /*
1127 * dev_loss_tmo attribute
1128 */
fc_str_to_dev_loss(const char * buf,unsigned long * val)1129 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
1130 {
1131 char *cp;
1132
1133 *val = simple_strtoul(buf, &cp, 0);
1134 if (*cp && (*cp != '\n'))
1135 return -EINVAL;
1136 /*
1137 * Check for overflow; dev_loss_tmo is u32
1138 */
1139 if (*val > UINT_MAX)
1140 return -EINVAL;
1141
1142 return 0;
1143 }
1144
fc_rport_set_dev_loss_tmo(struct fc_rport * rport,unsigned long val)1145 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
1146 unsigned long val)
1147 {
1148 struct Scsi_Host *shost = rport_to_shost(rport);
1149 struct fc_internal *i = to_fc_internal(shost->transportt);
1150
1151 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1152 (rport->port_state == FC_PORTSTATE_DELETED) ||
1153 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1154 return -EBUSY;
1155 /*
1156 * Check for overflow; dev_loss_tmo is u32
1157 */
1158 if (val > UINT_MAX)
1159 return -EINVAL;
1160
1161 /*
1162 * If fast_io_fail is off we have to cap
1163 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
1164 */
1165 if (rport->fast_io_fail_tmo == -1 &&
1166 val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1167 return -EINVAL;
1168
1169 i->f->set_rport_dev_loss_tmo(rport, val);
1170 return 0;
1171 }
1172
1173 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
1174 static ssize_t
store_fc_rport_dev_loss_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1175 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
1176 const char *buf, size_t count)
1177 {
1178 struct fc_rport *rport = transport_class_to_rport(dev);
1179 unsigned long val;
1180 int rc;
1181
1182 rc = fc_str_to_dev_loss(buf, &val);
1183 if (rc)
1184 return rc;
1185
1186 rc = fc_rport_set_dev_loss_tmo(rport, val);
1187 if (rc)
1188 return rc;
1189 return count;
1190 }
1191 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
1192 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
1193
1194
1195 /* Private Remote Port Attributes */
1196
1197 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1198 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1199 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
1200
1201 static ssize_t
show_fc_rport_roles(struct device * dev,struct device_attribute * attr,char * buf)1202 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
1203 char *buf)
1204 {
1205 struct fc_rport *rport = transport_class_to_rport(dev);
1206
1207 /* identify any roles that are port_id specific */
1208 if ((rport->port_id != -1) &&
1209 (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
1210 FC_WELLKNOWN_PORTID_MASK) {
1211 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
1212 case FC_FPORT_PORTID:
1213 return snprintf(buf, 30, "Fabric Port\n");
1214 case FC_FABCTLR_PORTID:
1215 return snprintf(buf, 30, "Fabric Controller\n");
1216 case FC_DIRSRVR_PORTID:
1217 return snprintf(buf, 30, "Directory Server\n");
1218 case FC_TIMESRVR_PORTID:
1219 return snprintf(buf, 30, "Time Server\n");
1220 case FC_MGMTSRVR_PORTID:
1221 return snprintf(buf, 30, "Management Server\n");
1222 default:
1223 return snprintf(buf, 30, "Unknown Fabric Entity\n");
1224 }
1225 } else {
1226 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
1227 return snprintf(buf, 20, "unknown\n");
1228 return get_fc_port_roles_names(rport->roles, buf);
1229 }
1230 }
1231 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
1232 show_fc_rport_roles, NULL);
1233
fc_rport_set_marginal_state(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1234 static ssize_t fc_rport_set_marginal_state(struct device *dev,
1235 struct device_attribute *attr,
1236 const char *buf, size_t count)
1237 {
1238 struct fc_rport *rport = transport_class_to_rport(dev);
1239 enum fc_port_state port_state;
1240 int ret = 0;
1241
1242 ret = get_fc_port_state_match(buf, &port_state);
1243 if (ret)
1244 return -EINVAL;
1245 if (port_state == FC_PORTSTATE_MARGINAL) {
1246 /*
1247 * Change the state to Marginal only if the
1248 * current rport state is Online
1249 * Allow only Online->Marginal
1250 */
1251 if (rport->port_state == FC_PORTSTATE_ONLINE)
1252 rport->port_state = port_state;
1253 else
1254 return -EINVAL;
1255 } else if (port_state == FC_PORTSTATE_ONLINE) {
1256 /*
1257 * Change the state to Online only if the
1258 * current rport state is Marginal
1259 * Allow only Marginal->Online
1260 */
1261 if (rport->port_state == FC_PORTSTATE_MARGINAL)
1262 rport->port_state = port_state;
1263 else
1264 return -EINVAL;
1265 } else
1266 return -EINVAL;
1267 return count;
1268 }
1269
1270 static ssize_t
show_fc_rport_port_state(struct device * dev,struct device_attribute * attr,char * buf)1271 show_fc_rport_port_state(struct device *dev,
1272 struct device_attribute *attr, char *buf)
1273 {
1274 const char *name;
1275 struct fc_rport *rport = transport_class_to_rport(dev);
1276
1277 name = get_fc_port_state_name(rport->port_state);
1278 if (!name)
1279 return -EINVAL;
1280
1281 return snprintf(buf, 20, "%s\n", name);
1282 }
1283
1284 static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
1285 show_fc_rport_port_state, fc_rport_set_marginal_state);
1286
1287 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
1288
1289 /*
1290 * fast_io_fail_tmo attribute
1291 */
1292 static ssize_t
show_fc_rport_fast_io_fail_tmo(struct device * dev,struct device_attribute * attr,char * buf)1293 show_fc_rport_fast_io_fail_tmo (struct device *dev,
1294 struct device_attribute *attr, char *buf)
1295 {
1296 struct fc_rport *rport = transport_class_to_rport(dev);
1297
1298 if (rport->fast_io_fail_tmo == -1)
1299 return snprintf(buf, 5, "off\n");
1300 return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
1301 }
1302
1303 static ssize_t
store_fc_rport_fast_io_fail_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1304 store_fc_rport_fast_io_fail_tmo(struct device *dev,
1305 struct device_attribute *attr, const char *buf,
1306 size_t count)
1307 {
1308 int val;
1309 char *cp;
1310 struct fc_rport *rport = transport_class_to_rport(dev);
1311
1312 if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1313 (rport->port_state == FC_PORTSTATE_DELETED) ||
1314 (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1315 return -EBUSY;
1316 if (strncmp(buf, "off", 3) == 0)
1317 rport->fast_io_fail_tmo = -1;
1318 else {
1319 val = simple_strtoul(buf, &cp, 0);
1320 if ((*cp && (*cp != '\n')) || (val < 0))
1321 return -EINVAL;
1322 /*
1323 * Cap fast_io_fail by dev_loss_tmo or
1324 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
1325 */
1326 if ((val >= rport->dev_loss_tmo) ||
1327 (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1328 return -EINVAL;
1329
1330 rport->fast_io_fail_tmo = val;
1331 }
1332 return count;
1333 }
1334 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1335 show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1336
1337 #define fc_rport_fpin_statistic(name) \
1338 static ssize_t fc_rport_fpinstat_##name(struct device *cd, \
1339 struct device_attribute *attr, \
1340 char *buf) \
1341 { \
1342 struct fc_rport *rport = transport_class_to_rport(cd); \
1343 \
1344 return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name); \
1345 } \
1346 static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
1347
1348 fc_rport_fpin_statistic(dn);
1349 fc_rport_fpin_statistic(dn_unknown);
1350 fc_rport_fpin_statistic(dn_timeout);
1351 fc_rport_fpin_statistic(dn_unable_to_route);
1352 fc_rport_fpin_statistic(dn_device_specific);
1353 fc_rport_fpin_statistic(cn);
1354 fc_rport_fpin_statistic(cn_clear);
1355 fc_rport_fpin_statistic(cn_lost_credit);
1356 fc_rport_fpin_statistic(cn_credit_stall);
1357 fc_rport_fpin_statistic(cn_oversubscription);
1358 fc_rport_fpin_statistic(cn_device_specific);
1359 fc_rport_fpin_statistic(li);
1360 fc_rport_fpin_statistic(li_failure_unknown);
1361 fc_rport_fpin_statistic(li_link_failure_count);
1362 fc_rport_fpin_statistic(li_loss_of_sync_count);
1363 fc_rport_fpin_statistic(li_loss_of_signals_count);
1364 fc_rport_fpin_statistic(li_prim_seq_err_count);
1365 fc_rport_fpin_statistic(li_invalid_tx_word_count);
1366 fc_rport_fpin_statistic(li_invalid_crc_count);
1367 fc_rport_fpin_statistic(li_device_specific);
1368
1369 static struct attribute *fc_rport_statistics_attrs[] = {
1370 &device_attr_rport_fpin_dn.attr,
1371 &device_attr_rport_fpin_dn_unknown.attr,
1372 &device_attr_rport_fpin_dn_timeout.attr,
1373 &device_attr_rport_fpin_dn_unable_to_route.attr,
1374 &device_attr_rport_fpin_dn_device_specific.attr,
1375 &device_attr_rport_fpin_li.attr,
1376 &device_attr_rport_fpin_li_failure_unknown.attr,
1377 &device_attr_rport_fpin_li_link_failure_count.attr,
1378 &device_attr_rport_fpin_li_loss_of_sync_count.attr,
1379 &device_attr_rport_fpin_li_loss_of_signals_count.attr,
1380 &device_attr_rport_fpin_li_prim_seq_err_count.attr,
1381 &device_attr_rport_fpin_li_invalid_tx_word_count.attr,
1382 &device_attr_rport_fpin_li_invalid_crc_count.attr,
1383 &device_attr_rport_fpin_li_device_specific.attr,
1384 &device_attr_rport_fpin_cn.attr,
1385 &device_attr_rport_fpin_cn_clear.attr,
1386 &device_attr_rport_fpin_cn_lost_credit.attr,
1387 &device_attr_rport_fpin_cn_credit_stall.attr,
1388 &device_attr_rport_fpin_cn_oversubscription.attr,
1389 &device_attr_rport_fpin_cn_device_specific.attr,
1390 NULL
1391 };
1392
1393 static struct attribute_group fc_rport_statistics_group = {
1394 .name = "statistics",
1395 .attrs = fc_rport_statistics_attrs,
1396 };
1397
1398
1399 /*
1400 * FC SCSI Target Attribute Management
1401 */
1402
1403 /*
1404 * Note: in the target show function we recognize when the remote
1405 * port is in the hierarchy and do not allow the driver to get
1406 * involved in sysfs functions. The driver only gets involved if
1407 * it's the "old" style that doesn't use rports.
1408 */
1409 #define fc_starget_show_function(field, format_string, sz, cast) \
1410 static ssize_t \
1411 show_fc_starget_##field (struct device *dev, \
1412 struct device_attribute *attr, char *buf) \
1413 { \
1414 struct scsi_target *starget = transport_class_to_starget(dev); \
1415 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1416 struct fc_internal *i = to_fc_internal(shost->transportt); \
1417 struct fc_rport *rport = starget_to_rport(starget); \
1418 if (rport) \
1419 fc_starget_##field(starget) = rport->field; \
1420 else if (i->f->get_starget_##field) \
1421 i->f->get_starget_##field(starget); \
1422 return snprintf(buf, sz, format_string, \
1423 cast fc_starget_##field(starget)); \
1424 }
1425
1426 #define fc_starget_rd_attr(field, format_string, sz) \
1427 fc_starget_show_function(field, format_string, sz, ) \
1428 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1429 show_fc_starget_##field, NULL)
1430
1431 #define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1432 fc_starget_show_function(field, format_string, sz, (cast)) \
1433 static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1434 show_fc_starget_##field, NULL)
1435
1436 #define SETUP_STARGET_ATTRIBUTE_RD(field) \
1437 i->private_starget_attrs[count] = device_attr_starget_##field; \
1438 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1439 i->private_starget_attrs[count].store = NULL; \
1440 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1441 if (i->f->show_starget_##field) \
1442 count++
1443
1444 #define SETUP_STARGET_ATTRIBUTE_RW(field) \
1445 i->private_starget_attrs[count] = device_attr_starget_##field; \
1446 if (!i->f->set_starget_##field) { \
1447 i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1448 i->private_starget_attrs[count].store = NULL; \
1449 } \
1450 i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1451 if (i->f->show_starget_##field) \
1452 count++
1453
1454 /* The FC Transport SCSI Target Attributes: */
1455 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1456 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1457 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1458
1459
1460 /*
1461 * FC Virtual Port Attribute Management
1462 */
1463
1464 #define fc_vport_show_function(field, format_string, sz, cast) \
1465 static ssize_t \
1466 show_fc_vport_##field (struct device *dev, \
1467 struct device_attribute *attr, char *buf) \
1468 { \
1469 struct fc_vport *vport = transport_class_to_vport(dev); \
1470 struct Scsi_Host *shost = vport_to_shost(vport); \
1471 struct fc_internal *i = to_fc_internal(shost->transportt); \
1472 if ((i->f->get_vport_##field) && \
1473 !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1474 i->f->get_vport_##field(vport); \
1475 return snprintf(buf, sz, format_string, cast vport->field); \
1476 }
1477
1478 #define fc_vport_store_function(field) \
1479 static ssize_t \
1480 store_fc_vport_##field(struct device *dev, \
1481 struct device_attribute *attr, \
1482 const char *buf, size_t count) \
1483 { \
1484 int val; \
1485 struct fc_vport *vport = transport_class_to_vport(dev); \
1486 struct Scsi_Host *shost = vport_to_shost(vport); \
1487 struct fc_internal *i = to_fc_internal(shost->transportt); \
1488 char *cp; \
1489 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1490 return -EBUSY; \
1491 val = simple_strtoul(buf, &cp, 0); \
1492 if (*cp && (*cp != '\n')) \
1493 return -EINVAL; \
1494 i->f->set_vport_##field(vport, val); \
1495 return count; \
1496 }
1497
1498 #define fc_vport_store_str_function(field, slen) \
1499 static ssize_t \
1500 store_fc_vport_##field(struct device *dev, \
1501 struct device_attribute *attr, \
1502 const char *buf, size_t count) \
1503 { \
1504 struct fc_vport *vport = transport_class_to_vport(dev); \
1505 struct Scsi_Host *shost = vport_to_shost(vport); \
1506 struct fc_internal *i = to_fc_internal(shost->transportt); \
1507 unsigned int cnt=count; \
1508 \
1509 /* count may include a LF at end of string */ \
1510 if (buf[cnt-1] == '\n') \
1511 cnt--; \
1512 if (cnt > ((slen) - 1)) \
1513 return -EINVAL; \
1514 memcpy(vport->field, buf, cnt); \
1515 i->f->set_vport_##field(vport); \
1516 return count; \
1517 }
1518
1519 #define fc_vport_rd_attr(field, format_string, sz) \
1520 fc_vport_show_function(field, format_string, sz, ) \
1521 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1522 show_fc_vport_##field, NULL)
1523
1524 #define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1525 fc_vport_show_function(field, format_string, sz, (cast)) \
1526 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1527 show_fc_vport_##field, NULL)
1528
1529 #define fc_vport_rw_attr(field, format_string, sz) \
1530 fc_vport_show_function(field, format_string, sz, ) \
1531 fc_vport_store_function(field) \
1532 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1533 show_fc_vport_##field, \
1534 store_fc_vport_##field)
1535
1536 #define fc_private_vport_show_function(field, format_string, sz, cast) \
1537 static ssize_t \
1538 show_fc_vport_##field (struct device *dev, \
1539 struct device_attribute *attr, char *buf) \
1540 { \
1541 struct fc_vport *vport = transport_class_to_vport(dev); \
1542 return snprintf(buf, sz, format_string, cast vport->field); \
1543 }
1544
1545 #define fc_private_vport_store_u32_function(field) \
1546 static ssize_t \
1547 store_fc_vport_##field(struct device *dev, \
1548 struct device_attribute *attr, \
1549 const char *buf, size_t count) \
1550 { \
1551 u32 val; \
1552 struct fc_vport *vport = transport_class_to_vport(dev); \
1553 char *cp; \
1554 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1555 return -EBUSY; \
1556 val = simple_strtoul(buf, &cp, 0); \
1557 if (*cp && (*cp != '\n')) \
1558 return -EINVAL; \
1559 vport->field = val; \
1560 return count; \
1561 }
1562
1563
1564 #define fc_private_vport_rd_attr(field, format_string, sz) \
1565 fc_private_vport_show_function(field, format_string, sz, ) \
1566 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1567 show_fc_vport_##field, NULL)
1568
1569 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1570 fc_private_vport_show_function(field, format_string, sz, (cast)) \
1571 static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1572 show_fc_vport_##field, NULL)
1573
1574 #define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1575 fc_private_vport_show_function(field, format_string, sz, ) \
1576 fc_private_vport_store_u32_function(field) \
1577 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1578 show_fc_vport_##field, \
1579 store_fc_vport_##field)
1580
1581
1582 #define fc_private_vport_rd_enum_attr(title, maxlen) \
1583 static ssize_t \
1584 show_fc_vport_##title (struct device *dev, \
1585 struct device_attribute *attr, \
1586 char *buf) \
1587 { \
1588 struct fc_vport *vport = transport_class_to_vport(dev); \
1589 const char *name; \
1590 name = get_fc_##title##_name(vport->title); \
1591 if (!name) \
1592 return -EINVAL; \
1593 return snprintf(buf, maxlen, "%s\n", name); \
1594 } \
1595 static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1596 show_fc_vport_##title, NULL)
1597
1598
1599 #define SETUP_VPORT_ATTRIBUTE_RD(field) \
1600 i->private_vport_attrs[count] = device_attr_vport_##field; \
1601 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1602 i->private_vport_attrs[count].store = NULL; \
1603 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1604 if (i->f->get_##field) \
1605 count++
1606 /* NOTE: Above MACRO differs: checks function not show bit */
1607
1608 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1609 i->private_vport_attrs[count] = device_attr_vport_##field; \
1610 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1611 i->private_vport_attrs[count].store = NULL; \
1612 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1613 count++
1614
1615 #define SETUP_VPORT_ATTRIBUTE_WR(field) \
1616 i->private_vport_attrs[count] = device_attr_vport_##field; \
1617 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1618 if (i->f->field) \
1619 count++
1620 /* NOTE: Above MACRO differs: checks function */
1621
1622 #define SETUP_VPORT_ATTRIBUTE_RW(field) \
1623 i->private_vport_attrs[count] = device_attr_vport_##field; \
1624 if (!i->f->set_vport_##field) { \
1625 i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1626 i->private_vport_attrs[count].store = NULL; \
1627 } \
1628 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1629 count++
1630 /* NOTE: Above MACRO differs: does not check show bit */
1631
1632 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1633 { \
1634 i->private_vport_attrs[count] = device_attr_vport_##field; \
1635 i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1636 count++; \
1637 }
1638
1639
1640 /* The FC Transport Virtual Port Attributes: */
1641
1642 /* Fixed Virtual Port Attributes */
1643
1644 /* Dynamic Virtual Port Attributes */
1645
1646 /* Private Virtual Port Attributes */
1647
1648 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1649 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1650 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1651 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1652
1653 static ssize_t
show_fc_vport_roles(struct device * dev,struct device_attribute * attr,char * buf)1654 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1655 char *buf)
1656 {
1657 struct fc_vport *vport = transport_class_to_vport(dev);
1658
1659 if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1660 return snprintf(buf, 20, "unknown\n");
1661 return get_fc_port_roles_names(vport->roles, buf);
1662 }
1663 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1664
1665 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1666
1667 fc_private_vport_show_function(symbolic_name, "%s\n",
1668 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1669 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1670 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1671 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1672
1673 static ssize_t
store_fc_vport_delete(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1674 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1675 const char *buf, size_t count)
1676 {
1677 struct fc_vport *vport = transport_class_to_vport(dev);
1678 struct Scsi_Host *shost = vport_to_shost(vport);
1679 unsigned long flags;
1680
1681 spin_lock_irqsave(shost->host_lock, flags);
1682 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1683 spin_unlock_irqrestore(shost->host_lock, flags);
1684 return -EBUSY;
1685 }
1686 vport->flags |= FC_VPORT_DELETING;
1687 spin_unlock_irqrestore(shost->host_lock, flags);
1688
1689 fc_queue_work(shost, &vport->vport_delete_work);
1690 return count;
1691 }
1692 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1693 NULL, store_fc_vport_delete);
1694
1695
1696 /*
1697 * Enable/Disable vport
1698 * Write "1" to disable, write "0" to enable
1699 */
1700 static ssize_t
store_fc_vport_disable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1701 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1702 const char *buf,
1703 size_t count)
1704 {
1705 struct fc_vport *vport = transport_class_to_vport(dev);
1706 struct Scsi_Host *shost = vport_to_shost(vport);
1707 struct fc_internal *i = to_fc_internal(shost->transportt);
1708 int stat;
1709
1710 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1711 return -EBUSY;
1712
1713 if (*buf == '0') {
1714 if (vport->vport_state != FC_VPORT_DISABLED)
1715 return -EALREADY;
1716 } else if (*buf == '1') {
1717 if (vport->vport_state == FC_VPORT_DISABLED)
1718 return -EALREADY;
1719 } else
1720 return -EINVAL;
1721
1722 stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1723 return stat ? stat : count;
1724 }
1725 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1726 NULL, store_fc_vport_disable);
1727
1728
1729 /*
1730 * Host Attribute Management
1731 */
1732
1733 #define fc_host_show_function(field, format_string, sz, cast) \
1734 static ssize_t \
1735 show_fc_host_##field (struct device *dev, \
1736 struct device_attribute *attr, char *buf) \
1737 { \
1738 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1739 struct fc_internal *i = to_fc_internal(shost->transportt); \
1740 if (i->f->get_host_##field) \
1741 i->f->get_host_##field(shost); \
1742 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1743 }
1744
1745 #define fc_host_store_function(field) \
1746 static ssize_t \
1747 store_fc_host_##field(struct device *dev, \
1748 struct device_attribute *attr, \
1749 const char *buf, size_t count) \
1750 { \
1751 int val; \
1752 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1753 struct fc_internal *i = to_fc_internal(shost->transportt); \
1754 char *cp; \
1755 \
1756 val = simple_strtoul(buf, &cp, 0); \
1757 if (*cp && (*cp != '\n')) \
1758 return -EINVAL; \
1759 i->f->set_host_##field(shost, val); \
1760 return count; \
1761 }
1762
1763 #define fc_host_store_str_function(field, slen) \
1764 static ssize_t \
1765 store_fc_host_##field(struct device *dev, \
1766 struct device_attribute *attr, \
1767 const char *buf, size_t count) \
1768 { \
1769 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1770 struct fc_internal *i = to_fc_internal(shost->transportt); \
1771 unsigned int cnt=count; \
1772 \
1773 /* count may include a LF at end of string */ \
1774 if (buf[cnt-1] == '\n') \
1775 cnt--; \
1776 if (cnt > ((slen) - 1)) \
1777 return -EINVAL; \
1778 memcpy(fc_host_##field(shost), buf, cnt); \
1779 i->f->set_host_##field(shost); \
1780 return count; \
1781 }
1782
1783 #define fc_host_rd_attr(field, format_string, sz) \
1784 fc_host_show_function(field, format_string, sz, ) \
1785 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1786 show_fc_host_##field, NULL)
1787
1788 #define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1789 fc_host_show_function(field, format_string, sz, (cast)) \
1790 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1791 show_fc_host_##field, NULL)
1792
1793 #define fc_host_rw_attr(field, format_string, sz) \
1794 fc_host_show_function(field, format_string, sz, ) \
1795 fc_host_store_function(field) \
1796 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1797 show_fc_host_##field, \
1798 store_fc_host_##field)
1799
1800 #define fc_host_rd_enum_attr(title, maxlen) \
1801 static ssize_t \
1802 show_fc_host_##title (struct device *dev, \
1803 struct device_attribute *attr, char *buf) \
1804 { \
1805 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1806 struct fc_internal *i = to_fc_internal(shost->transportt); \
1807 const char *name; \
1808 if (i->f->get_host_##title) \
1809 i->f->get_host_##title(shost); \
1810 name = get_fc_##title##_name(fc_host_##title(shost)); \
1811 if (!name) \
1812 return -EINVAL; \
1813 return snprintf(buf, maxlen, "%s\n", name); \
1814 } \
1815 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1816
1817 #define SETUP_HOST_ATTRIBUTE_RD(field) \
1818 i->private_host_attrs[count] = device_attr_host_##field; \
1819 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1820 i->private_host_attrs[count].store = NULL; \
1821 i->host_attrs[count] = &i->private_host_attrs[count]; \
1822 if (i->f->show_host_##field) \
1823 count++
1824
1825 #define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1826 i->private_host_attrs[count] = device_attr_host_##field; \
1827 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1828 i->private_host_attrs[count].store = NULL; \
1829 i->host_attrs[count] = &i->private_host_attrs[count]; \
1830 count++
1831
1832 #define SETUP_HOST_ATTRIBUTE_RW(field) \
1833 i->private_host_attrs[count] = device_attr_host_##field; \
1834 if (!i->f->set_host_##field) { \
1835 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1836 i->private_host_attrs[count].store = NULL; \
1837 } \
1838 i->host_attrs[count] = &i->private_host_attrs[count]; \
1839 if (i->f->show_host_##field) \
1840 count++
1841
1842
1843 #define fc_private_host_show_function(field, format_string, sz, cast) \
1844 static ssize_t \
1845 show_fc_host_##field (struct device *dev, \
1846 struct device_attribute *attr, char *buf) \
1847 { \
1848 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1849 return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1850 }
1851
1852 #define fc_private_host_rd_attr(field, format_string, sz) \
1853 fc_private_host_show_function(field, format_string, sz, ) \
1854 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1855 show_fc_host_##field, NULL)
1856
1857 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1858 fc_private_host_show_function(field, format_string, sz, (cast)) \
1859 static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1860 show_fc_host_##field, NULL)
1861
1862 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1863 i->private_host_attrs[count] = device_attr_host_##field; \
1864 i->private_host_attrs[count].attr.mode = S_IRUGO; \
1865 i->private_host_attrs[count].store = NULL; \
1866 i->host_attrs[count] = &i->private_host_attrs[count]; \
1867 count++
1868
1869 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1870 { \
1871 i->private_host_attrs[count] = device_attr_host_##field; \
1872 i->host_attrs[count] = &i->private_host_attrs[count]; \
1873 count++; \
1874 }
1875
1876
1877 /* Fixed Host Attributes */
1878
1879 static ssize_t
show_fc_host_supported_classes(struct device * dev,struct device_attribute * attr,char * buf)1880 show_fc_host_supported_classes (struct device *dev,
1881 struct device_attribute *attr, char *buf)
1882 {
1883 struct Scsi_Host *shost = transport_class_to_shost(dev);
1884
1885 if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1886 return snprintf(buf, 20, "unspecified\n");
1887
1888 return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1889 }
1890 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1891 show_fc_host_supported_classes, NULL);
1892
1893 static ssize_t
show_fc_host_supported_fc4s(struct device * dev,struct device_attribute * attr,char * buf)1894 show_fc_host_supported_fc4s (struct device *dev,
1895 struct device_attribute *attr, char *buf)
1896 {
1897 struct Scsi_Host *shost = transport_class_to_shost(dev);
1898 return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1899 }
1900 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1901 show_fc_host_supported_fc4s, NULL);
1902
1903 static ssize_t
show_fc_host_supported_speeds(struct device * dev,struct device_attribute * attr,char * buf)1904 show_fc_host_supported_speeds (struct device *dev,
1905 struct device_attribute *attr, char *buf)
1906 {
1907 struct Scsi_Host *shost = transport_class_to_shost(dev);
1908
1909 if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1910 return snprintf(buf, 20, "unknown\n");
1911
1912 return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1913 }
1914 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1915 show_fc_host_supported_speeds, NULL);
1916
1917
1918 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1919 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1920 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1921 unsigned long long);
1922 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1923 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1924 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1925 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1926 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1927 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1928 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1929 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1930 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1931 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1932
1933
1934 /* Dynamic Host Attributes */
1935
1936 static ssize_t
show_fc_host_active_fc4s(struct device * dev,struct device_attribute * attr,char * buf)1937 show_fc_host_active_fc4s (struct device *dev,
1938 struct device_attribute *attr, char *buf)
1939 {
1940 struct Scsi_Host *shost = transport_class_to_shost(dev);
1941 struct fc_internal *i = to_fc_internal(shost->transportt);
1942
1943 if (i->f->get_host_active_fc4s)
1944 i->f->get_host_active_fc4s(shost);
1945
1946 return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1947 }
1948 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1949 show_fc_host_active_fc4s, NULL);
1950
1951 static ssize_t
show_fc_host_speed(struct device * dev,struct device_attribute * attr,char * buf)1952 show_fc_host_speed (struct device *dev,
1953 struct device_attribute *attr, char *buf)
1954 {
1955 struct Scsi_Host *shost = transport_class_to_shost(dev);
1956 struct fc_internal *i = to_fc_internal(shost->transportt);
1957
1958 if (i->f->get_host_speed)
1959 i->f->get_host_speed(shost);
1960
1961 if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1962 return snprintf(buf, 20, "unknown\n");
1963
1964 return get_fc_port_speed_names(fc_host_speed(shost), buf);
1965 }
1966 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1967 show_fc_host_speed, NULL);
1968
1969
1970 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1971 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1972 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1973 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1974 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1975
1976 fc_private_host_show_function(system_hostname, "%s\n",
1977 FC_SYMBOLIC_NAME_SIZE + 1, )
1978 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1979 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1980 show_fc_host_system_hostname, store_fc_host_system_hostname);
1981
1982
1983 /* Private Host Attributes */
1984
1985 static ssize_t
show_fc_private_host_tgtid_bind_type(struct device * dev,struct device_attribute * attr,char * buf)1986 show_fc_private_host_tgtid_bind_type(struct device *dev,
1987 struct device_attribute *attr, char *buf)
1988 {
1989 struct Scsi_Host *shost = transport_class_to_shost(dev);
1990 const char *name;
1991
1992 name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1993 if (!name)
1994 return -EINVAL;
1995 return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1996 }
1997
1998 #define get_list_head_entry(pos, head, member) \
1999 pos = list_entry((head)->next, typeof(*pos), member)
2000
2001 static ssize_t
store_fc_private_host_tgtid_bind_type(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2002 store_fc_private_host_tgtid_bind_type(struct device *dev,
2003 struct device_attribute *attr, const char *buf, size_t count)
2004 {
2005 struct Scsi_Host *shost = transport_class_to_shost(dev);
2006 struct fc_rport *rport;
2007 enum fc_tgtid_binding_type val;
2008 unsigned long flags;
2009
2010 if (get_fc_tgtid_bind_type_match(buf, &val))
2011 return -EINVAL;
2012
2013 /* if changing bind type, purge all unused consistent bindings */
2014 if (val != fc_host_tgtid_bind_type(shost)) {
2015 spin_lock_irqsave(shost->host_lock, flags);
2016 while (!list_empty(&fc_host_rport_bindings(shost))) {
2017 get_list_head_entry(rport,
2018 &fc_host_rport_bindings(shost), peers);
2019 list_del(&rport->peers);
2020 rport->port_state = FC_PORTSTATE_DELETED;
2021 fc_queue_work(shost, &rport->rport_delete_work);
2022 }
2023 spin_unlock_irqrestore(shost->host_lock, flags);
2024 }
2025
2026 fc_host_tgtid_bind_type(shost) = val;
2027 return count;
2028 }
2029
2030 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
2031 show_fc_private_host_tgtid_bind_type,
2032 store_fc_private_host_tgtid_bind_type);
2033
2034 static ssize_t
store_fc_private_host_issue_lip(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2035 store_fc_private_host_issue_lip(struct device *dev,
2036 struct device_attribute *attr, const char *buf, size_t count)
2037 {
2038 struct Scsi_Host *shost = transport_class_to_shost(dev);
2039 struct fc_internal *i = to_fc_internal(shost->transportt);
2040 int ret;
2041
2042 /* ignore any data value written to the attribute */
2043 if (i->f->issue_fc_host_lip) {
2044 ret = i->f->issue_fc_host_lip(shost);
2045 return ret ? ret: count;
2046 }
2047
2048 return -ENOENT;
2049 }
2050
2051 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
2052 store_fc_private_host_issue_lip);
2053
2054 static ssize_t
store_fc_private_host_dev_loss_tmo(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2055 store_fc_private_host_dev_loss_tmo(struct device *dev,
2056 struct device_attribute *attr,
2057 const char *buf, size_t count)
2058 {
2059 struct Scsi_Host *shost = transport_class_to_shost(dev);
2060 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2061 struct fc_rport *rport;
2062 unsigned long val, flags;
2063 int rc;
2064
2065 rc = fc_str_to_dev_loss(buf, &val);
2066 if (rc)
2067 return rc;
2068
2069 fc_host_dev_loss_tmo(shost) = val;
2070 spin_lock_irqsave(shost->host_lock, flags);
2071 list_for_each_entry(rport, &fc_host->rports, peers)
2072 fc_rport_set_dev_loss_tmo(rport, val);
2073 spin_unlock_irqrestore(shost->host_lock, flags);
2074 return count;
2075 }
2076
2077 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
2078 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
2079 show_fc_host_dev_loss_tmo,
2080 store_fc_private_host_dev_loss_tmo);
2081
2082 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
2083
2084 /*
2085 * Host Statistics Management
2086 */
2087
2088 /* Show a given attribute in the statistics group */
2089 static ssize_t
fc_stat_show(const struct device * dev,char * buf,unsigned long offset)2090 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
2091 {
2092 struct Scsi_Host *shost = transport_class_to_shost(dev);
2093 struct fc_internal *i = to_fc_internal(shost->transportt);
2094 struct fc_host_statistics *stats;
2095 ssize_t ret = -ENOENT;
2096
2097 if (offset > sizeof(struct fc_host_statistics) ||
2098 offset % sizeof(u64) != 0)
2099 WARN_ON(1);
2100
2101 if (i->f->get_fc_host_stats) {
2102 stats = (i->f->get_fc_host_stats)(shost);
2103 if (stats)
2104 ret = snprintf(buf, 20, "0x%llx\n",
2105 (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
2106 }
2107 return ret;
2108 }
2109
2110
2111 /* generate a read-only statistics attribute */
2112 #define fc_host_statistic(name) \
2113 static ssize_t show_fcstat_##name(struct device *cd, \
2114 struct device_attribute *attr, \
2115 char *buf) \
2116 { \
2117 return fc_stat_show(cd, buf, \
2118 offsetof(struct fc_host_statistics, name)); \
2119 } \
2120 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
2121
2122 fc_host_statistic(seconds_since_last_reset);
2123 fc_host_statistic(tx_frames);
2124 fc_host_statistic(tx_words);
2125 fc_host_statistic(rx_frames);
2126 fc_host_statistic(rx_words);
2127 fc_host_statistic(lip_count);
2128 fc_host_statistic(nos_count);
2129 fc_host_statistic(error_frames);
2130 fc_host_statistic(dumped_frames);
2131 fc_host_statistic(link_failure_count);
2132 fc_host_statistic(loss_of_sync_count);
2133 fc_host_statistic(loss_of_signal_count);
2134 fc_host_statistic(prim_seq_protocol_err_count);
2135 fc_host_statistic(invalid_tx_word_count);
2136 fc_host_statistic(invalid_crc_count);
2137 fc_host_statistic(fcp_input_requests);
2138 fc_host_statistic(fcp_output_requests);
2139 fc_host_statistic(fcp_control_requests);
2140 fc_host_statistic(fcp_input_megabytes);
2141 fc_host_statistic(fcp_output_megabytes);
2142 fc_host_statistic(fcp_packet_alloc_failures);
2143 fc_host_statistic(fcp_packet_aborts);
2144 fc_host_statistic(fcp_frame_alloc_failures);
2145 fc_host_statistic(fc_no_free_exch);
2146 fc_host_statistic(fc_no_free_exch_xid);
2147 fc_host_statistic(fc_xid_not_found);
2148 fc_host_statistic(fc_xid_busy);
2149 fc_host_statistic(fc_seq_not_found);
2150 fc_host_statistic(fc_non_bls_resp);
2151 fc_host_statistic(cn_sig_warn);
2152 fc_host_statistic(cn_sig_alarm);
2153
2154
2155 #define fc_host_fpin_statistic(name) \
2156 static ssize_t fc_host_fpinstat_##name(struct device *cd, \
2157 struct device_attribute *attr, \
2158 char *buf) \
2159 { \
2160 struct Scsi_Host *shost = transport_class_to_shost(cd); \
2161 struct fc_host_attrs *fc_host = shost_to_fc_host(shost); \
2162 \
2163 return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name); \
2164 } \
2165 static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
2166
2167 fc_host_fpin_statistic(dn);
2168 fc_host_fpin_statistic(dn_unknown);
2169 fc_host_fpin_statistic(dn_timeout);
2170 fc_host_fpin_statistic(dn_unable_to_route);
2171 fc_host_fpin_statistic(dn_device_specific);
2172 fc_host_fpin_statistic(cn);
2173 fc_host_fpin_statistic(cn_clear);
2174 fc_host_fpin_statistic(cn_lost_credit);
2175 fc_host_fpin_statistic(cn_credit_stall);
2176 fc_host_fpin_statistic(cn_oversubscription);
2177 fc_host_fpin_statistic(cn_device_specific);
2178 fc_host_fpin_statistic(li);
2179 fc_host_fpin_statistic(li_failure_unknown);
2180 fc_host_fpin_statistic(li_link_failure_count);
2181 fc_host_fpin_statistic(li_loss_of_sync_count);
2182 fc_host_fpin_statistic(li_loss_of_signals_count);
2183 fc_host_fpin_statistic(li_prim_seq_err_count);
2184 fc_host_fpin_statistic(li_invalid_tx_word_count);
2185 fc_host_fpin_statistic(li_invalid_crc_count);
2186 fc_host_fpin_statistic(li_device_specific);
2187
2188 static ssize_t
fc_reset_statistics(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2189 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
2190 const char *buf, size_t count)
2191 {
2192 struct Scsi_Host *shost = transport_class_to_shost(dev);
2193 struct fc_internal *i = to_fc_internal(shost->transportt);
2194
2195 /* ignore any data value written to the attribute */
2196 if (i->f->reset_fc_host_stats) {
2197 i->f->reset_fc_host_stats(shost);
2198 return count;
2199 }
2200
2201 return -ENOENT;
2202 }
2203 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
2204 fc_reset_statistics);
2205
2206 static struct attribute *fc_statistics_attrs[] = {
2207 &device_attr_host_seconds_since_last_reset.attr,
2208 &device_attr_host_tx_frames.attr,
2209 &device_attr_host_tx_words.attr,
2210 &device_attr_host_rx_frames.attr,
2211 &device_attr_host_rx_words.attr,
2212 &device_attr_host_lip_count.attr,
2213 &device_attr_host_nos_count.attr,
2214 &device_attr_host_error_frames.attr,
2215 &device_attr_host_dumped_frames.attr,
2216 &device_attr_host_link_failure_count.attr,
2217 &device_attr_host_loss_of_sync_count.attr,
2218 &device_attr_host_loss_of_signal_count.attr,
2219 &device_attr_host_prim_seq_protocol_err_count.attr,
2220 &device_attr_host_invalid_tx_word_count.attr,
2221 &device_attr_host_invalid_crc_count.attr,
2222 &device_attr_host_fcp_input_requests.attr,
2223 &device_attr_host_fcp_output_requests.attr,
2224 &device_attr_host_fcp_control_requests.attr,
2225 &device_attr_host_fcp_input_megabytes.attr,
2226 &device_attr_host_fcp_output_megabytes.attr,
2227 &device_attr_host_fcp_packet_alloc_failures.attr,
2228 &device_attr_host_fcp_packet_aborts.attr,
2229 &device_attr_host_fcp_frame_alloc_failures.attr,
2230 &device_attr_host_fc_no_free_exch.attr,
2231 &device_attr_host_fc_no_free_exch_xid.attr,
2232 &device_attr_host_fc_xid_not_found.attr,
2233 &device_attr_host_fc_xid_busy.attr,
2234 &device_attr_host_fc_seq_not_found.attr,
2235 &device_attr_host_fc_non_bls_resp.attr,
2236 &device_attr_host_cn_sig_warn.attr,
2237 &device_attr_host_cn_sig_alarm.attr,
2238 &device_attr_host_reset_statistics.attr,
2239 &device_attr_host_fpin_dn.attr,
2240 &device_attr_host_fpin_dn_unknown.attr,
2241 &device_attr_host_fpin_dn_timeout.attr,
2242 &device_attr_host_fpin_dn_unable_to_route.attr,
2243 &device_attr_host_fpin_dn_device_specific.attr,
2244 &device_attr_host_fpin_li.attr,
2245 &device_attr_host_fpin_li_failure_unknown.attr,
2246 &device_attr_host_fpin_li_link_failure_count.attr,
2247 &device_attr_host_fpin_li_loss_of_sync_count.attr,
2248 &device_attr_host_fpin_li_loss_of_signals_count.attr,
2249 &device_attr_host_fpin_li_prim_seq_err_count.attr,
2250 &device_attr_host_fpin_li_invalid_tx_word_count.attr,
2251 &device_attr_host_fpin_li_invalid_crc_count.attr,
2252 &device_attr_host_fpin_li_device_specific.attr,
2253 &device_attr_host_fpin_cn.attr,
2254 &device_attr_host_fpin_cn_clear.attr,
2255 &device_attr_host_fpin_cn_lost_credit.attr,
2256 &device_attr_host_fpin_cn_credit_stall.attr,
2257 &device_attr_host_fpin_cn_oversubscription.attr,
2258 &device_attr_host_fpin_cn_device_specific.attr,
2259 NULL
2260 };
2261
2262 static struct attribute_group fc_statistics_group = {
2263 .name = "statistics",
2264 .attrs = fc_statistics_attrs,
2265 };
2266
2267
2268 /* Host Vport Attributes */
2269
2270 static int
fc_parse_wwn(const char * ns,u64 * nm)2271 fc_parse_wwn(const char *ns, u64 *nm)
2272 {
2273 unsigned int i, j;
2274 u8 wwn[8];
2275
2276 memset(wwn, 0, sizeof(wwn));
2277
2278 /* Validate and store the new name */
2279 for (i=0, j=0; i < 16; i++) {
2280 int value;
2281
2282 value = hex_to_bin(*ns++);
2283 if (value >= 0)
2284 j = (j << 4) | value;
2285 else
2286 return -EINVAL;
2287 if (i % 2) {
2288 wwn[i/2] = j & 0xff;
2289 j = 0;
2290 }
2291 }
2292
2293 *nm = wwn_to_u64(wwn);
2294
2295 return 0;
2296 }
2297
2298
2299 /*
2300 * "Short-cut" sysfs variable to create a new vport on a FC Host.
2301 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
2302 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
2303 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
2304 */
2305 static ssize_t
store_fc_host_vport_create(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2306 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
2307 const char *buf, size_t count)
2308 {
2309 struct Scsi_Host *shost = transport_class_to_shost(dev);
2310 struct fc_vport_identifiers vid;
2311 struct fc_vport *vport;
2312 unsigned int cnt=count;
2313 int stat;
2314
2315 memset(&vid, 0, sizeof(vid));
2316
2317 /* count may include a LF at end of string */
2318 if (buf[cnt-1] == '\n')
2319 cnt--;
2320
2321 /* validate we have enough characters for WWPN */
2322 if ((cnt != (16+1+16)) || (buf[16] != ':'))
2323 return -EINVAL;
2324
2325 stat = fc_parse_wwn(&buf[0], &vid.port_name);
2326 if (stat)
2327 return stat;
2328
2329 stat = fc_parse_wwn(&buf[17], &vid.node_name);
2330 if (stat)
2331 return stat;
2332
2333 vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
2334 vid.vport_type = FC_PORTTYPE_NPIV;
2335 /* vid.symbolic_name is already zero/NULL's */
2336 vid.disable = false; /* always enabled */
2337
2338 /* we only allow support on Channel 0 !!! */
2339 stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
2340 return stat ? stat : count;
2341 }
2342 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
2343 store_fc_host_vport_create);
2344
2345
2346 /*
2347 * "Short-cut" sysfs variable to delete a vport on a FC Host.
2348 * Vport is identified by a string containing "<WWPN>:<WWNN>".
2349 * The WWNs are specified as hex characters, and may *not* contain
2350 * any prefixes (e.g. 0x, x, etc)
2351 */
2352 static ssize_t
store_fc_host_vport_delete(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)2353 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
2354 const char *buf, size_t count)
2355 {
2356 struct Scsi_Host *shost = transport_class_to_shost(dev);
2357 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2358 struct fc_vport *vport;
2359 u64 wwpn, wwnn;
2360 unsigned long flags;
2361 unsigned int cnt=count;
2362 int stat, match;
2363
2364 /* count may include a LF at end of string */
2365 if (buf[cnt-1] == '\n')
2366 cnt--;
2367
2368 /* validate we have enough characters for WWPN */
2369 if ((cnt != (16+1+16)) || (buf[16] != ':'))
2370 return -EINVAL;
2371
2372 stat = fc_parse_wwn(&buf[0], &wwpn);
2373 if (stat)
2374 return stat;
2375
2376 stat = fc_parse_wwn(&buf[17], &wwnn);
2377 if (stat)
2378 return stat;
2379
2380 spin_lock_irqsave(shost->host_lock, flags);
2381 match = 0;
2382 /* we only allow support on Channel 0 !!! */
2383 list_for_each_entry(vport, &fc_host->vports, peers) {
2384 if ((vport->channel == 0) &&
2385 (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
2386 if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
2387 break;
2388 vport->flags |= FC_VPORT_DELETING;
2389 match = 1;
2390 break;
2391 }
2392 }
2393 spin_unlock_irqrestore(shost->host_lock, flags);
2394
2395 if (!match)
2396 return -ENODEV;
2397
2398 stat = fc_vport_terminate(vport);
2399 return stat ? stat : count;
2400 }
2401 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
2402 store_fc_host_vport_delete);
2403
2404
fc_host_match(struct attribute_container * cont,struct device * dev)2405 static int fc_host_match(struct attribute_container *cont,
2406 struct device *dev)
2407 {
2408 struct Scsi_Host *shost;
2409 struct fc_internal *i;
2410
2411 if (!scsi_is_host_device(dev))
2412 return 0;
2413
2414 shost = dev_to_shost(dev);
2415 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2416 != &fc_host_class.class)
2417 return 0;
2418
2419 i = to_fc_internal(shost->transportt);
2420
2421 return &i->t.host_attrs.ac == cont;
2422 }
2423
fc_target_match(struct attribute_container * cont,struct device * dev)2424 static int fc_target_match(struct attribute_container *cont,
2425 struct device *dev)
2426 {
2427 struct Scsi_Host *shost;
2428 struct fc_internal *i;
2429
2430 if (!scsi_is_target_device(dev))
2431 return 0;
2432
2433 shost = dev_to_shost(dev->parent);
2434 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2435 != &fc_host_class.class)
2436 return 0;
2437
2438 i = to_fc_internal(shost->transportt);
2439
2440 return &i->t.target_attrs.ac == cont;
2441 }
2442
fc_rport_dev_release(struct device * dev)2443 static void fc_rport_dev_release(struct device *dev)
2444 {
2445 struct fc_rport *rport = dev_to_rport(dev);
2446 put_device(dev->parent);
2447 kfree(rport);
2448 }
2449
scsi_is_fc_rport(const struct device * dev)2450 int scsi_is_fc_rport(const struct device *dev)
2451 {
2452 return dev->release == fc_rport_dev_release;
2453 }
2454 EXPORT_SYMBOL(scsi_is_fc_rport);
2455
fc_rport_match(struct attribute_container * cont,struct device * dev)2456 static int fc_rport_match(struct attribute_container *cont,
2457 struct device *dev)
2458 {
2459 struct Scsi_Host *shost;
2460 struct fc_internal *i;
2461
2462 if (!scsi_is_fc_rport(dev))
2463 return 0;
2464
2465 shost = dev_to_shost(dev->parent);
2466 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2467 != &fc_host_class.class)
2468 return 0;
2469
2470 i = to_fc_internal(shost->transportt);
2471
2472 return &i->rport_attr_cont.ac == cont;
2473 }
2474
2475
fc_vport_dev_release(struct device * dev)2476 static void fc_vport_dev_release(struct device *dev)
2477 {
2478 struct fc_vport *vport = dev_to_vport(dev);
2479 put_device(dev->parent); /* release kobj parent */
2480 kfree(vport);
2481 }
2482
scsi_is_fc_vport(const struct device * dev)2483 static int scsi_is_fc_vport(const struct device *dev)
2484 {
2485 return dev->release == fc_vport_dev_release;
2486 }
2487
fc_vport_match(struct attribute_container * cont,struct device * dev)2488 static int fc_vport_match(struct attribute_container *cont,
2489 struct device *dev)
2490 {
2491 struct fc_vport *vport;
2492 struct Scsi_Host *shost;
2493 struct fc_internal *i;
2494
2495 if (!scsi_is_fc_vport(dev))
2496 return 0;
2497 vport = dev_to_vport(dev);
2498
2499 shost = vport_to_shost(vport);
2500 if (!shost->transportt || shost->transportt->host_attrs.ac.class
2501 != &fc_host_class.class)
2502 return 0;
2503
2504 i = to_fc_internal(shost->transportt);
2505 return &i->vport_attr_cont.ac == cont;
2506 }
2507
2508
2509 /**
2510 * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2511 * @scmd: The SCSI command which timed out
2512 *
2513 * This routine protects against error handlers getting invoked while a
2514 * rport is in a blocked state, typically due to a temporarily loss of
2515 * connectivity. If the error handlers are allowed to proceed, requests
2516 * to abort i/o, reset the target, etc will likely fail as there is no way
2517 * to communicate with the device to perform the requested function. These
2518 * failures may result in the midlayer taking the device offline, requiring
2519 * manual intervention to restore operation.
2520 *
2521 * This routine, called whenever an i/o times out, validates the state of
2522 * the underlying rport. If the rport is blocked, it returns
2523 * EH_RESET_TIMER, which will continue to reschedule the timeout.
2524 * Eventually, either the device will return, or devloss_tmo will fire,
2525 * and when the timeout then fires, it will be handled normally.
2526 * If the rport is not blocked, normal error handling continues.
2527 *
2528 * Notes:
2529 * This routine assumes no locks are held on entry.
2530 */
2531 enum blk_eh_timer_return
fc_eh_timed_out(struct scsi_cmnd * scmd)2532 fc_eh_timed_out(struct scsi_cmnd *scmd)
2533 {
2534 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2535
2536 if (rport->port_state == FC_PORTSTATE_BLOCKED)
2537 return BLK_EH_RESET_TIMER;
2538
2539 return BLK_EH_DONE;
2540 }
2541 EXPORT_SYMBOL(fc_eh_timed_out);
2542
2543 /*
2544 * Called by fc_user_scan to locate an rport on the shost that
2545 * matches the channel and target id, and invoke scsi_scan_target()
2546 * on the rport.
2547 */
2548 static void
fc_user_scan_tgt(struct Scsi_Host * shost,uint channel,uint id,u64 lun)2549 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2550 {
2551 struct fc_rport *rport;
2552 unsigned long flags;
2553
2554 spin_lock_irqsave(shost->host_lock, flags);
2555
2556 list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2557 if (rport->scsi_target_id == -1)
2558 continue;
2559
2560 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
2561 (rport->port_state != FC_PORTSTATE_MARGINAL))
2562 continue;
2563
2564 if ((channel == rport->channel) &&
2565 (id == rport->scsi_target_id)) {
2566 spin_unlock_irqrestore(shost->host_lock, flags);
2567 scsi_scan_target(&rport->dev, channel, id, lun,
2568 SCSI_SCAN_MANUAL);
2569 return;
2570 }
2571 }
2572
2573 spin_unlock_irqrestore(shost->host_lock, flags);
2574 }
2575
2576 /*
2577 * Called via sysfs scan routines. Necessary, as the FC transport
2578 * wants to place all target objects below the rport object. So this
2579 * routine must invoke the scsi_scan_target() routine with the rport
2580 * object as the parent.
2581 */
2582 static int
fc_user_scan(struct Scsi_Host * shost,uint channel,uint id,u64 lun)2583 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2584 {
2585 uint chlo, chhi;
2586 uint tgtlo, tgthi;
2587
2588 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2589 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2590 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2591 return -EINVAL;
2592
2593 if (channel == SCAN_WILD_CARD) {
2594 chlo = 0;
2595 chhi = shost->max_channel + 1;
2596 } else {
2597 chlo = channel;
2598 chhi = channel + 1;
2599 }
2600
2601 if (id == SCAN_WILD_CARD) {
2602 tgtlo = 0;
2603 tgthi = shost->max_id;
2604 } else {
2605 tgtlo = id;
2606 tgthi = id + 1;
2607 }
2608
2609 for ( ; chlo < chhi; chlo++)
2610 for ( ; tgtlo < tgthi; tgtlo++)
2611 fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2612
2613 return 0;
2614 }
2615
2616 struct scsi_transport_template *
fc_attach_transport(struct fc_function_template * ft)2617 fc_attach_transport(struct fc_function_template *ft)
2618 {
2619 int count;
2620 struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2621 GFP_KERNEL);
2622
2623 if (unlikely(!i))
2624 return NULL;
2625
2626 i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2627 i->t.target_attrs.ac.class = &fc_transport_class.class;
2628 i->t.target_attrs.ac.match = fc_target_match;
2629 i->t.target_size = sizeof(struct fc_starget_attrs);
2630 transport_container_register(&i->t.target_attrs);
2631
2632 i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2633 i->t.host_attrs.ac.class = &fc_host_class.class;
2634 i->t.host_attrs.ac.match = fc_host_match;
2635 i->t.host_size = sizeof(struct fc_host_attrs);
2636 if (ft->get_fc_host_stats)
2637 i->t.host_attrs.statistics = &fc_statistics_group;
2638 transport_container_register(&i->t.host_attrs);
2639
2640 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2641 i->rport_attr_cont.ac.class = &fc_rport_class.class;
2642 i->rport_attr_cont.ac.match = fc_rport_match;
2643 i->rport_attr_cont.statistics = &fc_rport_statistics_group;
2644 transport_container_register(&i->rport_attr_cont);
2645
2646 i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2647 i->vport_attr_cont.ac.class = &fc_vport_class.class;
2648 i->vport_attr_cont.ac.match = fc_vport_match;
2649 transport_container_register(&i->vport_attr_cont);
2650
2651 i->f = ft;
2652
2653 /* Transport uses the shost workq for scsi scanning */
2654 i->t.create_work_queue = 1;
2655
2656 i->t.user_scan = fc_user_scan;
2657
2658 /*
2659 * Setup SCSI Target Attributes.
2660 */
2661 count = 0;
2662 SETUP_STARGET_ATTRIBUTE_RD(node_name);
2663 SETUP_STARGET_ATTRIBUTE_RD(port_name);
2664 SETUP_STARGET_ATTRIBUTE_RD(port_id);
2665
2666 BUG_ON(count > FC_STARGET_NUM_ATTRS);
2667
2668 i->starget_attrs[count] = NULL;
2669
2670
2671 /*
2672 * Setup SCSI Host Attributes.
2673 */
2674 count=0;
2675 SETUP_HOST_ATTRIBUTE_RD(node_name);
2676 SETUP_HOST_ATTRIBUTE_RD(port_name);
2677 SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2678 SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2679 SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2680 SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2681 SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2682 if (ft->vport_create) {
2683 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2684 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2685 }
2686 SETUP_HOST_ATTRIBUTE_RD(serial_number);
2687 SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2688 SETUP_HOST_ATTRIBUTE_RD(model);
2689 SETUP_HOST_ATTRIBUTE_RD(model_description);
2690 SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2691 SETUP_HOST_ATTRIBUTE_RD(driver_version);
2692 SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2693 SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2694
2695 SETUP_HOST_ATTRIBUTE_RD(port_id);
2696 SETUP_HOST_ATTRIBUTE_RD(port_type);
2697 SETUP_HOST_ATTRIBUTE_RD(port_state);
2698 SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2699 SETUP_HOST_ATTRIBUTE_RD(speed);
2700 SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2701 SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2702 SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2703
2704 /* Transport-managed attributes */
2705 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2706 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2707 if (ft->issue_fc_host_lip)
2708 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2709 if (ft->vport_create)
2710 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2711 if (ft->vport_delete)
2712 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2713
2714 BUG_ON(count > FC_HOST_NUM_ATTRS);
2715
2716 i->host_attrs[count] = NULL;
2717
2718 /*
2719 * Setup Remote Port Attributes.
2720 */
2721 count=0;
2722 SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2723 SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2724 SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2725 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2726 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2727 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2728 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2729 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(port_state);
2730 SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2731 SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2732
2733 BUG_ON(count > FC_RPORT_NUM_ATTRS);
2734
2735 i->rport_attrs[count] = NULL;
2736
2737 /*
2738 * Setup Virtual Port Attributes.
2739 */
2740 count=0;
2741 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2742 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2743 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2744 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2745 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2746 SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2747 SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2748 SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2749 SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2750
2751 BUG_ON(count > FC_VPORT_NUM_ATTRS);
2752
2753 i->vport_attrs[count] = NULL;
2754
2755 return &i->t;
2756 }
2757 EXPORT_SYMBOL(fc_attach_transport);
2758
fc_release_transport(struct scsi_transport_template * t)2759 void fc_release_transport(struct scsi_transport_template *t)
2760 {
2761 struct fc_internal *i = to_fc_internal(t);
2762
2763 transport_container_unregister(&i->t.target_attrs);
2764 transport_container_unregister(&i->t.host_attrs);
2765 transport_container_unregister(&i->rport_attr_cont);
2766 transport_container_unregister(&i->vport_attr_cont);
2767
2768 kfree(i);
2769 }
2770 EXPORT_SYMBOL(fc_release_transport);
2771
2772 /**
2773 * fc_queue_work - Queue work to the fc_host workqueue.
2774 * @shost: Pointer to Scsi_Host bound to fc_host.
2775 * @work: Work to queue for execution.
2776 *
2777 * Return value:
2778 * 1 - work queued for execution
2779 * 0 - work is already queued
2780 * -EINVAL - work queue doesn't exist
2781 */
2782 static int
fc_queue_work(struct Scsi_Host * shost,struct work_struct * work)2783 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2784 {
2785 if (unlikely(!fc_host_work_q(shost))) {
2786 printk(KERN_ERR
2787 "ERROR: FC host '%s' attempted to queue work, "
2788 "when no workqueue created.\n", shost->hostt->name);
2789 dump_stack();
2790
2791 return -EINVAL;
2792 }
2793
2794 return queue_work(fc_host_work_q(shost), work);
2795 }
2796
2797 /**
2798 * fc_flush_work - Flush a fc_host's workqueue.
2799 * @shost: Pointer to Scsi_Host bound to fc_host.
2800 */
2801 static void
fc_flush_work(struct Scsi_Host * shost)2802 fc_flush_work(struct Scsi_Host *shost)
2803 {
2804 if (!fc_host_work_q(shost)) {
2805 printk(KERN_ERR
2806 "ERROR: FC host '%s' attempted to flush work, "
2807 "when no workqueue created.\n", shost->hostt->name);
2808 dump_stack();
2809 return;
2810 }
2811
2812 flush_workqueue(fc_host_work_q(shost));
2813 }
2814
2815 /**
2816 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2817 * @shost: Pointer to Scsi_Host bound to fc_host.
2818 * @work: Work to queue for execution.
2819 * @delay: jiffies to delay the work queuing
2820 *
2821 * Return value:
2822 * 1 on success / 0 already queued / < 0 for error
2823 */
2824 static int
fc_queue_devloss_work(struct Scsi_Host * shost,struct delayed_work * work,unsigned long delay)2825 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2826 unsigned long delay)
2827 {
2828 if (unlikely(!fc_host_devloss_work_q(shost))) {
2829 printk(KERN_ERR
2830 "ERROR: FC host '%s' attempted to queue work, "
2831 "when no workqueue created.\n", shost->hostt->name);
2832 dump_stack();
2833
2834 return -EINVAL;
2835 }
2836
2837 return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2838 }
2839
2840 /**
2841 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2842 * @shost: Pointer to Scsi_Host bound to fc_host.
2843 */
2844 static void
fc_flush_devloss(struct Scsi_Host * shost)2845 fc_flush_devloss(struct Scsi_Host *shost)
2846 {
2847 if (!fc_host_devloss_work_q(shost)) {
2848 printk(KERN_ERR
2849 "ERROR: FC host '%s' attempted to flush work, "
2850 "when no workqueue created.\n", shost->hostt->name);
2851 dump_stack();
2852 return;
2853 }
2854
2855 flush_workqueue(fc_host_devloss_work_q(shost));
2856 }
2857
2858
2859 /**
2860 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2861 * @shost: Which &Scsi_Host
2862 *
2863 * This routine is expected to be called immediately preceding the
2864 * a driver's call to scsi_remove_host().
2865 *
2866 * WARNING: A driver utilizing the fc_transport, which fails to call
2867 * this routine prior to scsi_remove_host(), will leave dangling
2868 * objects in /sys/class/fc_remote_ports. Access to any of these
2869 * objects can result in a system crash !!!
2870 *
2871 * Notes:
2872 * This routine assumes no locks are held on entry.
2873 */
2874 void
fc_remove_host(struct Scsi_Host * shost)2875 fc_remove_host(struct Scsi_Host *shost)
2876 {
2877 struct fc_vport *vport = NULL, *next_vport = NULL;
2878 struct fc_rport *rport = NULL, *next_rport = NULL;
2879 struct workqueue_struct *work_q;
2880 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2881 unsigned long flags;
2882
2883 spin_lock_irqsave(shost->host_lock, flags);
2884
2885 /* Remove any vports */
2886 list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2887 vport->flags |= FC_VPORT_DELETING;
2888 fc_queue_work(shost, &vport->vport_delete_work);
2889 }
2890
2891 /* Remove any remote ports */
2892 list_for_each_entry_safe(rport, next_rport,
2893 &fc_host->rports, peers) {
2894 list_del(&rport->peers);
2895 rport->port_state = FC_PORTSTATE_DELETED;
2896 fc_queue_work(shost, &rport->rport_delete_work);
2897 }
2898
2899 list_for_each_entry_safe(rport, next_rport,
2900 &fc_host->rport_bindings, peers) {
2901 list_del(&rport->peers);
2902 rport->port_state = FC_PORTSTATE_DELETED;
2903 fc_queue_work(shost, &rport->rport_delete_work);
2904 }
2905
2906 spin_unlock_irqrestore(shost->host_lock, flags);
2907
2908 /* flush all scan work items */
2909 scsi_flush_work(shost);
2910
2911 /* flush all stgt delete, and rport delete work items, then kill it */
2912 if (fc_host->work_q) {
2913 work_q = fc_host->work_q;
2914 fc_host->work_q = NULL;
2915 destroy_workqueue(work_q);
2916 }
2917
2918 /* flush all devloss work items, then kill it */
2919 if (fc_host->devloss_work_q) {
2920 work_q = fc_host->devloss_work_q;
2921 fc_host->devloss_work_q = NULL;
2922 destroy_workqueue(work_q);
2923 }
2924 }
2925 EXPORT_SYMBOL(fc_remove_host);
2926
fc_terminate_rport_io(struct fc_rport * rport)2927 static void fc_terminate_rport_io(struct fc_rport *rport)
2928 {
2929 struct Scsi_Host *shost = rport_to_shost(rport);
2930 struct fc_internal *i = to_fc_internal(shost->transportt);
2931
2932 /* Involve the LLDD if possible to terminate all io on the rport. */
2933 if (i->f->terminate_rport_io)
2934 i->f->terminate_rport_io(rport);
2935
2936 /*
2937 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2938 */
2939 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2940 }
2941
2942 /**
2943 * fc_starget_delete - called to delete the scsi descendants of an rport
2944 * @work: remote port to be operated on.
2945 *
2946 * Deletes target and all sdevs.
2947 */
2948 static void
fc_starget_delete(struct work_struct * work)2949 fc_starget_delete(struct work_struct *work)
2950 {
2951 struct fc_rport *rport =
2952 container_of(work, struct fc_rport, stgt_delete_work);
2953
2954 fc_terminate_rport_io(rport);
2955 scsi_remove_target(&rport->dev);
2956 }
2957
2958
2959 /**
2960 * fc_rport_final_delete - finish rport termination and delete it.
2961 * @work: remote port to be deleted.
2962 */
2963 static void
fc_rport_final_delete(struct work_struct * work)2964 fc_rport_final_delete(struct work_struct *work)
2965 {
2966 struct fc_rport *rport =
2967 container_of(work, struct fc_rport, rport_delete_work);
2968 struct device *dev = &rport->dev;
2969 struct Scsi_Host *shost = rport_to_shost(rport);
2970 struct fc_internal *i = to_fc_internal(shost->transportt);
2971 unsigned long flags;
2972 int do_callback = 0;
2973
2974 fc_terminate_rport_io(rport);
2975
2976 /*
2977 * if a scan is pending, flush the SCSI Host work_q so that
2978 * that we can reclaim the rport scan work element.
2979 */
2980 if (rport->flags & FC_RPORT_SCAN_PENDING)
2981 scsi_flush_work(shost);
2982
2983 /*
2984 * Cancel any outstanding timers. These should really exist
2985 * only when rmmod'ing the LLDD and we're asking for
2986 * immediate termination of the rports
2987 */
2988 spin_lock_irqsave(shost->host_lock, flags);
2989 if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2990 spin_unlock_irqrestore(shost->host_lock, flags);
2991 if (!cancel_delayed_work(&rport->fail_io_work))
2992 fc_flush_devloss(shost);
2993 if (!cancel_delayed_work(&rport->dev_loss_work))
2994 fc_flush_devloss(shost);
2995 cancel_work_sync(&rport->scan_work);
2996 spin_lock_irqsave(shost->host_lock, flags);
2997 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2998 }
2999 spin_unlock_irqrestore(shost->host_lock, flags);
3000
3001 /* Delete SCSI target and sdevs */
3002 if (rport->scsi_target_id != -1)
3003 fc_starget_delete(&rport->stgt_delete_work);
3004
3005 /*
3006 * Notify the driver that the rport is now dead. The LLDD will
3007 * also guarantee that any communication to the rport is terminated
3008 *
3009 * Avoid this call if we already called it when we preserved the
3010 * rport for the binding.
3011 */
3012 spin_lock_irqsave(shost->host_lock, flags);
3013 if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
3014 (i->f->dev_loss_tmo_callbk)) {
3015 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3016 do_callback = 1;
3017 }
3018 spin_unlock_irqrestore(shost->host_lock, flags);
3019
3020 if (do_callback)
3021 i->f->dev_loss_tmo_callbk(rport);
3022
3023 fc_bsg_remove(rport->rqst_q);
3024
3025 transport_remove_device(dev);
3026 device_del(dev);
3027 transport_destroy_device(dev);
3028 scsi_host_put(shost); /* for fc_host->rport list */
3029 put_device(dev); /* for self-reference */
3030 }
3031
3032
3033 /**
3034 * fc_remote_port_create - allocates and creates a remote FC port.
3035 * @shost: scsi host the remote port is connected to.
3036 * @channel: Channel on shost port connected to.
3037 * @ids: The world wide names, fc address, and FC4 port
3038 * roles for the remote port.
3039 *
3040 * Allocates and creates the remoter port structure, including the
3041 * class and sysfs creation.
3042 *
3043 * Notes:
3044 * This routine assumes no locks are held on entry.
3045 */
3046 static struct fc_rport *
fc_remote_port_create(struct Scsi_Host * shost,int channel,struct fc_rport_identifiers * ids)3047 fc_remote_port_create(struct Scsi_Host *shost, int channel,
3048 struct fc_rport_identifiers *ids)
3049 {
3050 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3051 struct fc_internal *fci = to_fc_internal(shost->transportt);
3052 struct fc_rport *rport;
3053 struct device *dev;
3054 unsigned long flags;
3055 int error;
3056 size_t size;
3057
3058 size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
3059 rport = kzalloc(size, GFP_KERNEL);
3060 if (unlikely(!rport)) {
3061 printk(KERN_ERR "%s: allocation failure\n", __func__);
3062 return NULL;
3063 }
3064
3065 rport->maxframe_size = -1;
3066 rport->supported_classes = FC_COS_UNSPECIFIED;
3067 rport->dev_loss_tmo = fc_host->dev_loss_tmo;
3068 memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
3069 memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
3070 rport->port_id = ids->port_id;
3071 rport->roles = ids->roles;
3072 rport->port_state = FC_PORTSTATE_ONLINE;
3073 if (fci->f->dd_fcrport_size)
3074 rport->dd_data = &rport[1];
3075 rport->channel = channel;
3076 rport->fast_io_fail_tmo = -1;
3077
3078 INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
3079 INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
3080 INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
3081 INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
3082 INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
3083
3084 spin_lock_irqsave(shost->host_lock, flags);
3085
3086 rport->number = fc_host->next_rport_number++;
3087 if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
3088 (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
3089 rport->scsi_target_id = fc_host->next_target_id++;
3090 else
3091 rport->scsi_target_id = -1;
3092 list_add_tail(&rport->peers, &fc_host->rports);
3093 scsi_host_get(shost); /* for fc_host->rport list */
3094
3095 spin_unlock_irqrestore(shost->host_lock, flags);
3096
3097 dev = &rport->dev;
3098 device_initialize(dev); /* takes self reference */
3099 dev->parent = get_device(&shost->shost_gendev); /* parent reference */
3100 dev->release = fc_rport_dev_release;
3101 dev_set_name(dev, "rport-%d:%d-%d",
3102 shost->host_no, channel, rport->number);
3103 transport_setup_device(dev);
3104
3105 error = device_add(dev);
3106 if (error) {
3107 printk(KERN_ERR "FC Remote Port device_add failed\n");
3108 goto delete_rport;
3109 }
3110 transport_add_device(dev);
3111 transport_configure_device(dev);
3112
3113 fc_bsg_rportadd(shost, rport);
3114 /* ignore any bsg add error - we just can't do sgio */
3115
3116 if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
3117 /* initiate a scan of the target */
3118 rport->flags |= FC_RPORT_SCAN_PENDING;
3119 scsi_queue_work(shost, &rport->scan_work);
3120 }
3121
3122 return rport;
3123
3124 delete_rport:
3125 transport_destroy_device(dev);
3126 spin_lock_irqsave(shost->host_lock, flags);
3127 list_del(&rport->peers);
3128 scsi_host_put(shost); /* for fc_host->rport list */
3129 spin_unlock_irqrestore(shost->host_lock, flags);
3130 put_device(dev->parent);
3131 kfree(rport);
3132 return NULL;
3133 }
3134
3135 /**
3136 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
3137 * @shost: scsi host the remote port is connected to.
3138 * @channel: Channel on shost port connected to.
3139 * @ids: The world wide names, fc address, and FC4 port
3140 * roles for the remote port.
3141 *
3142 * The LLDD calls this routine to notify the transport of the existence
3143 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
3144 * of the port, it's FC address (port_id), and the FC4 roles that are
3145 * active for the port.
3146 *
3147 * For ports that are FCP targets (aka scsi targets), the FC transport
3148 * maintains consistent target id bindings on behalf of the LLDD.
3149 * A consistent target id binding is an assignment of a target id to
3150 * a remote port identifier, which persists while the scsi host is
3151 * attached. The remote port can disappear, then later reappear, and
3152 * it's target id assignment remains the same. This allows for shifts
3153 * in FC addressing (if binding by wwpn or wwnn) with no apparent
3154 * changes to the scsi subsystem which is based on scsi host number and
3155 * target id values. Bindings are only valid during the attachment of
3156 * the scsi host. If the host detaches, then later re-attaches, target
3157 * id bindings may change.
3158 *
3159 * This routine is responsible for returning a remote port structure.
3160 * The routine will search the list of remote ports it maintains
3161 * internally on behalf of consistent target id mappings. If found, the
3162 * remote port structure will be reused. Otherwise, a new remote port
3163 * structure will be allocated.
3164 *
3165 * Whenever a remote port is allocated, a new fc_remote_port class
3166 * device is created.
3167 *
3168 * Should not be called from interrupt context.
3169 *
3170 * Notes:
3171 * This routine assumes no locks are held on entry.
3172 */
3173 struct fc_rport *
fc_remote_port_add(struct Scsi_Host * shost,int channel,struct fc_rport_identifiers * ids)3174 fc_remote_port_add(struct Scsi_Host *shost, int channel,
3175 struct fc_rport_identifiers *ids)
3176 {
3177 struct fc_internal *fci = to_fc_internal(shost->transportt);
3178 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3179 struct fc_rport *rport;
3180 unsigned long flags;
3181 int match = 0;
3182
3183 /* ensure any stgt delete functions are done */
3184 fc_flush_work(shost);
3185
3186 /*
3187 * Search the list of "active" rports, for an rport that has been
3188 * deleted, but we've held off the real delete while the target
3189 * is in a "blocked" state.
3190 */
3191 spin_lock_irqsave(shost->host_lock, flags);
3192
3193 list_for_each_entry(rport, &fc_host->rports, peers) {
3194
3195 if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
3196 rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
3197 (rport->channel == channel)) {
3198
3199 switch (fc_host->tgtid_bind_type) {
3200 case FC_TGTID_BIND_BY_WWPN:
3201 case FC_TGTID_BIND_NONE:
3202 if (rport->port_name == ids->port_name)
3203 match = 1;
3204 break;
3205 case FC_TGTID_BIND_BY_WWNN:
3206 if (rport->node_name == ids->node_name)
3207 match = 1;
3208 break;
3209 case FC_TGTID_BIND_BY_ID:
3210 if (rport->port_id == ids->port_id)
3211 match = 1;
3212 break;
3213 }
3214
3215 if (match) {
3216
3217 memcpy(&rport->node_name, &ids->node_name,
3218 sizeof(rport->node_name));
3219 memcpy(&rport->port_name, &ids->port_name,
3220 sizeof(rport->port_name));
3221 rport->port_id = ids->port_id;
3222
3223 rport->port_state = FC_PORTSTATE_ONLINE;
3224 rport->roles = ids->roles;
3225
3226 spin_unlock_irqrestore(shost->host_lock, flags);
3227
3228 if (fci->f->dd_fcrport_size)
3229 memset(rport->dd_data, 0,
3230 fci->f->dd_fcrport_size);
3231
3232 /*
3233 * If we were not a target, cancel the
3234 * io terminate and rport timers, and
3235 * we're done.
3236 *
3237 * If we were a target, but our new role
3238 * doesn't indicate a target, leave the
3239 * timers running expecting the role to
3240 * change as the target fully logs in. If
3241 * it doesn't, the target will be torn down.
3242 *
3243 * If we were a target, and our role shows
3244 * we're still a target, cancel the timers
3245 * and kick off a scan.
3246 */
3247
3248 /* was a target, not in roles */
3249 if ((rport->scsi_target_id != -1) &&
3250 (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
3251 return rport;
3252
3253 /*
3254 * Stop the fail io and dev_loss timers.
3255 * If they flush, the port_state will
3256 * be checked and will NOOP the function.
3257 */
3258 if (!cancel_delayed_work(&rport->fail_io_work))
3259 fc_flush_devloss(shost);
3260 if (!cancel_delayed_work(&rport->dev_loss_work))
3261 fc_flush_devloss(shost);
3262
3263 spin_lock_irqsave(shost->host_lock, flags);
3264
3265 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3266 FC_RPORT_DEVLOSS_PENDING |
3267 FC_RPORT_DEVLOSS_CALLBK_DONE);
3268
3269 spin_unlock_irqrestore(shost->host_lock, flags);
3270
3271 /* if target, initiate a scan */
3272 if (rport->scsi_target_id != -1) {
3273 scsi_target_unblock(&rport->dev,
3274 SDEV_RUNNING);
3275 spin_lock_irqsave(shost->host_lock,
3276 flags);
3277 rport->flags |= FC_RPORT_SCAN_PENDING;
3278 scsi_queue_work(shost,
3279 &rport->scan_work);
3280 spin_unlock_irqrestore(shost->host_lock,
3281 flags);
3282 }
3283
3284 fc_bsg_goose_queue(rport);
3285
3286 return rport;
3287 }
3288 }
3289 }
3290
3291 /*
3292 * Search the bindings array
3293 * Note: if never a FCP target, you won't be on this list
3294 */
3295 if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
3296
3297 /* search for a matching consistent binding */
3298
3299 list_for_each_entry(rport, &fc_host->rport_bindings,
3300 peers) {
3301 if (rport->channel != channel)
3302 continue;
3303
3304 switch (fc_host->tgtid_bind_type) {
3305 case FC_TGTID_BIND_BY_WWPN:
3306 if (rport->port_name == ids->port_name)
3307 match = 1;
3308 break;
3309 case FC_TGTID_BIND_BY_WWNN:
3310 if (rport->node_name == ids->node_name)
3311 match = 1;
3312 break;
3313 case FC_TGTID_BIND_BY_ID:
3314 if (rport->port_id == ids->port_id)
3315 match = 1;
3316 break;
3317 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3318 break;
3319 }
3320
3321 if (match) {
3322 list_move_tail(&rport->peers, &fc_host->rports);
3323 break;
3324 }
3325 }
3326
3327 if (match) {
3328 memcpy(&rport->node_name, &ids->node_name,
3329 sizeof(rport->node_name));
3330 memcpy(&rport->port_name, &ids->port_name,
3331 sizeof(rport->port_name));
3332 rport->port_id = ids->port_id;
3333 rport->port_state = FC_PORTSTATE_ONLINE;
3334 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3335
3336 if (fci->f->dd_fcrport_size)
3337 memset(rport->dd_data, 0,
3338 fci->f->dd_fcrport_size);
3339 spin_unlock_irqrestore(shost->host_lock, flags);
3340
3341 fc_remote_port_rolechg(rport, ids->roles);
3342 return rport;
3343 }
3344 }
3345
3346 spin_unlock_irqrestore(shost->host_lock, flags);
3347
3348 /* No consistent binding found - create new remote port entry */
3349 rport = fc_remote_port_create(shost, channel, ids);
3350
3351 return rport;
3352 }
3353 EXPORT_SYMBOL(fc_remote_port_add);
3354
3355
3356 /**
3357 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
3358 * @rport: The remote port that no longer exists
3359 *
3360 * The LLDD calls this routine to notify the transport that a remote
3361 * port is no longer part of the topology. Note: Although a port
3362 * may no longer be part of the topology, it may persist in the remote
3363 * ports displayed by the fc_host. We do this under 2 conditions:
3364 *
3365 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
3366 * This allows the port to temporarily disappear, then reappear without
3367 * disrupting the SCSI device tree attached to it. During the "blocked"
3368 * period the port will still exist.
3369 *
3370 * 2) If the port was a scsi target and disappears for longer than we
3371 * expect, we'll delete the port and the tear down the SCSI device tree
3372 * attached to it. However, we want to semi-persist the target id assigned
3373 * to that port if it eventually does exist. The port structure will
3374 * remain (although with minimal information) so that the target id
3375 * bindings also remain.
3376 *
3377 * If the remote port is not an FCP Target, it will be fully torn down
3378 * and deallocated, including the fc_remote_port class device.
3379 *
3380 * If the remote port is an FCP Target, the port will be placed in a
3381 * temporary blocked state. From the LLDD's perspective, the rport no
3382 * longer exists. From the SCSI midlayer's perspective, the SCSI target
3383 * exists, but all sdevs on it are blocked from further I/O. The following
3384 * is then expected.
3385 *
3386 * If the remote port does not return (signaled by a LLDD call to
3387 * fc_remote_port_add()) within the dev_loss_tmo timeout, then the
3388 * scsi target is removed - killing all outstanding i/o and removing the
3389 * scsi devices attached to it. The port structure will be marked Not
3390 * Present and be partially cleared, leaving only enough information to
3391 * recognize the remote port relative to the scsi target id binding if
3392 * it later appears. The port will remain as long as there is a valid
3393 * binding (e.g. until the user changes the binding type or unloads the
3394 * scsi host with the binding).
3395 *
3396 * If the remote port returns within the dev_loss_tmo value (and matches
3397 * according to the target id binding type), the port structure will be
3398 * reused. If it is no longer a SCSI target, the target will be torn
3399 * down. If it continues to be a SCSI target, then the target will be
3400 * unblocked (allowing i/o to be resumed), and a scan will be activated
3401 * to ensure that all luns are detected.
3402 *
3403 * Called from normal process context only - cannot be called from interrupt.
3404 *
3405 * Notes:
3406 * This routine assumes no locks are held on entry.
3407 */
3408 void
fc_remote_port_delete(struct fc_rport * rport)3409 fc_remote_port_delete(struct fc_rport *rport)
3410 {
3411 struct Scsi_Host *shost = rport_to_shost(rport);
3412 unsigned long timeout = rport->dev_loss_tmo;
3413 unsigned long flags;
3414
3415 /*
3416 * No need to flush the fc_host work_q's, as all adds are synchronous.
3417 *
3418 * We do need to reclaim the rport scan work element, so eventually
3419 * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
3420 * there's still a scan pending.
3421 */
3422
3423 spin_lock_irqsave(shost->host_lock, flags);
3424
3425 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3426 (rport->port_state != FC_PORTSTATE_MARGINAL)) {
3427 spin_unlock_irqrestore(shost->host_lock, flags);
3428 return;
3429 }
3430
3431 /*
3432 * In the past, we if this was not an FCP-Target, we would
3433 * unconditionally just jump to deleting the rport.
3434 * However, rports can be used as node containers by the LLDD,
3435 * and its not appropriate to just terminate the rport at the
3436 * first sign of a loss in connectivity. The LLDD may want to
3437 * send ELS traffic to re-validate the login. If the rport is
3438 * immediately deleted, it makes it inappropriate for a node
3439 * container.
3440 * So... we now unconditionally wait dev_loss_tmo before
3441 * destroying an rport.
3442 */
3443
3444 rport->port_state = FC_PORTSTATE_BLOCKED;
3445
3446 rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3447
3448 spin_unlock_irqrestore(shost->host_lock, flags);
3449
3450 scsi_target_block(&rport->dev);
3451
3452 /* see if we need to kill io faster than waiting for device loss */
3453 if ((rport->fast_io_fail_tmo != -1) &&
3454 (rport->fast_io_fail_tmo < timeout))
3455 fc_queue_devloss_work(shost, &rport->fail_io_work,
3456 rport->fast_io_fail_tmo * HZ);
3457
3458 /* cap the length the devices can be blocked until they are deleted */
3459 fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3460 }
3461 EXPORT_SYMBOL(fc_remote_port_delete);
3462
3463 /**
3464 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3465 * @rport: The remote port that changed.
3466 * @roles: New roles for this port.
3467 *
3468 * Description: The LLDD calls this routine to notify the transport that the
3469 * roles on a remote port may have changed. The largest effect of this is
3470 * if a port now becomes a FCP Target, it must be allocated a
3471 * scsi target id. If the port is no longer a FCP target, any
3472 * scsi target id value assigned to it will persist in case the
3473 * role changes back to include FCP Target. No changes in the scsi
3474 * midlayer will be invoked if the role changes (in the expectation
3475 * that the role will be resumed. If it doesn't normal error processing
3476 * will take place).
3477 *
3478 * Should not be called from interrupt context.
3479 *
3480 * Notes:
3481 * This routine assumes no locks are held on entry.
3482 */
3483 void
fc_remote_port_rolechg(struct fc_rport * rport,u32 roles)3484 fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3485 {
3486 struct Scsi_Host *shost = rport_to_shost(rport);
3487 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3488 unsigned long flags;
3489 int create = 0;
3490
3491 spin_lock_irqsave(shost->host_lock, flags);
3492 if (roles & FC_PORT_ROLE_FCP_TARGET) {
3493 if (rport->scsi_target_id == -1) {
3494 rport->scsi_target_id = fc_host->next_target_id++;
3495 create = 1;
3496 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3497 create = 1;
3498 }
3499
3500 rport->roles = roles;
3501
3502 spin_unlock_irqrestore(shost->host_lock, flags);
3503
3504 if (create) {
3505 /*
3506 * There may have been a delete timer running on the
3507 * port. Ensure that it is cancelled as we now know
3508 * the port is an FCP Target.
3509 * Note: we know the rport exists and is in an online
3510 * state as the LLDD would not have had an rport
3511 * reference to pass us.
3512 *
3513 * Take no action on the del_timer failure as the state
3514 * machine state change will validate the
3515 * transaction.
3516 */
3517 if (!cancel_delayed_work(&rport->fail_io_work))
3518 fc_flush_devloss(shost);
3519 if (!cancel_delayed_work(&rport->dev_loss_work))
3520 fc_flush_devloss(shost);
3521
3522 spin_lock_irqsave(shost->host_lock, flags);
3523 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3524 FC_RPORT_DEVLOSS_PENDING |
3525 FC_RPORT_DEVLOSS_CALLBK_DONE);
3526 spin_unlock_irqrestore(shost->host_lock, flags);
3527
3528 /* ensure any stgt delete functions are done */
3529 fc_flush_work(shost);
3530
3531 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3532 /* initiate a scan of the target */
3533 spin_lock_irqsave(shost->host_lock, flags);
3534 rport->flags |= FC_RPORT_SCAN_PENDING;
3535 scsi_queue_work(shost, &rport->scan_work);
3536 spin_unlock_irqrestore(shost->host_lock, flags);
3537 }
3538 }
3539 EXPORT_SYMBOL(fc_remote_port_rolechg);
3540
3541 /**
3542 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3543 * @work: rport target that failed to reappear in the allotted time.
3544 *
3545 * Description: An attempt to delete a remote port blocks, and if it fails
3546 * to return in the allotted time this gets called.
3547 */
3548 static void
fc_timeout_deleted_rport(struct work_struct * work)3549 fc_timeout_deleted_rport(struct work_struct *work)
3550 {
3551 struct fc_rport *rport =
3552 container_of(work, struct fc_rport, dev_loss_work.work);
3553 struct Scsi_Host *shost = rport_to_shost(rport);
3554 struct fc_internal *i = to_fc_internal(shost->transportt);
3555 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3556 unsigned long flags;
3557 int do_callback = 0;
3558
3559 spin_lock_irqsave(shost->host_lock, flags);
3560
3561 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3562
3563 /*
3564 * If the port is ONLINE, then it came back. If it was a SCSI
3565 * target, validate it still is. If not, tear down the
3566 * scsi_target on it.
3567 */
3568 if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3569 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3570 (rport->scsi_target_id != -1) &&
3571 !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3572 dev_printk(KERN_ERR, &rport->dev,
3573 "blocked FC remote port time out: no longer"
3574 " a FCP target, removing starget\n");
3575 spin_unlock_irqrestore(shost->host_lock, flags);
3576 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3577 fc_queue_work(shost, &rport->stgt_delete_work);
3578 return;
3579 }
3580
3581 /* NOOP state - we're flushing workq's */
3582 if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3583 spin_unlock_irqrestore(shost->host_lock, flags);
3584 dev_printk(KERN_ERR, &rport->dev,
3585 "blocked FC remote port time out: leaving"
3586 " rport%s alone\n",
3587 (rport->scsi_target_id != -1) ? " and starget" : "");
3588 return;
3589 }
3590
3591 if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3592 (rport->scsi_target_id == -1)) {
3593 list_del(&rport->peers);
3594 rport->port_state = FC_PORTSTATE_DELETED;
3595 dev_printk(KERN_ERR, &rport->dev,
3596 "blocked FC remote port time out: removing"
3597 " rport%s\n",
3598 (rport->scsi_target_id != -1) ? " and starget" : "");
3599 fc_queue_work(shost, &rport->rport_delete_work);
3600 spin_unlock_irqrestore(shost->host_lock, flags);
3601 return;
3602 }
3603
3604 dev_printk(KERN_ERR, &rport->dev,
3605 "blocked FC remote port time out: removing target and "
3606 "saving binding\n");
3607
3608 list_move_tail(&rport->peers, &fc_host->rport_bindings);
3609
3610 /*
3611 * Note: We do not remove or clear the hostdata area. This allows
3612 * host-specific target data to persist along with the
3613 * scsi_target_id. It's up to the host to manage it's hostdata area.
3614 */
3615
3616 /*
3617 * Reinitialize port attributes that may change if the port comes back.
3618 */
3619 rport->maxframe_size = -1;
3620 rport->supported_classes = FC_COS_UNSPECIFIED;
3621 rport->roles = FC_PORT_ROLE_UNKNOWN;
3622 rport->port_state = FC_PORTSTATE_NOTPRESENT;
3623 rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3624
3625 /*
3626 * Pre-emptively kill I/O rather than waiting for the work queue
3627 * item to teardown the starget. (FCOE libFC folks prefer this
3628 * and to have the rport_port_id still set when it's done).
3629 */
3630 spin_unlock_irqrestore(shost->host_lock, flags);
3631 fc_terminate_rport_io(rport);
3632
3633 spin_lock_irqsave(shost->host_lock, flags);
3634
3635 if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3636
3637 /* remove the identifiers that aren't used in the consisting binding */
3638 switch (fc_host->tgtid_bind_type) {
3639 case FC_TGTID_BIND_BY_WWPN:
3640 rport->node_name = -1;
3641 rport->port_id = -1;
3642 break;
3643 case FC_TGTID_BIND_BY_WWNN:
3644 rport->port_name = -1;
3645 rport->port_id = -1;
3646 break;
3647 case FC_TGTID_BIND_BY_ID:
3648 rport->node_name = -1;
3649 rport->port_name = -1;
3650 break;
3651 case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3652 break;
3653 }
3654
3655 /*
3656 * As this only occurs if the remote port (scsi target)
3657 * went away and didn't come back - we'll remove
3658 * all attached scsi devices.
3659 */
3660 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3661 fc_queue_work(shost, &rport->stgt_delete_work);
3662
3663 do_callback = 1;
3664 }
3665
3666 spin_unlock_irqrestore(shost->host_lock, flags);
3667
3668 /*
3669 * Notify the driver that the rport is now dead. The LLDD will
3670 * also guarantee that any communication to the rport is terminated
3671 *
3672 * Note: we set the CALLBK_DONE flag above to correspond
3673 */
3674 if (do_callback && i->f->dev_loss_tmo_callbk)
3675 i->f->dev_loss_tmo_callbk(rport);
3676 }
3677
3678
3679 /**
3680 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3681 * @work: rport to terminate io on.
3682 *
3683 * Notes: Only requests the failure of the io, not that all are flushed
3684 * prior to returning.
3685 */
3686 static void
fc_timeout_fail_rport_io(struct work_struct * work)3687 fc_timeout_fail_rport_io(struct work_struct *work)
3688 {
3689 struct fc_rport *rport =
3690 container_of(work, struct fc_rport, fail_io_work.work);
3691
3692 if (rport->port_state != FC_PORTSTATE_BLOCKED)
3693 return;
3694
3695 rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3696 fc_terminate_rport_io(rport);
3697 }
3698
3699 /**
3700 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3701 * @work: remote port to be scanned.
3702 */
3703 static void
fc_scsi_scan_rport(struct work_struct * work)3704 fc_scsi_scan_rport(struct work_struct *work)
3705 {
3706 struct fc_rport *rport =
3707 container_of(work, struct fc_rport, scan_work);
3708 struct Scsi_Host *shost = rport_to_shost(rport);
3709 struct fc_internal *i = to_fc_internal(shost->transportt);
3710 unsigned long flags;
3711
3712 if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3713 (rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3714 (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3715 !(i->f->disable_target_scan)) {
3716 scsi_scan_target(&rport->dev, rport->channel,
3717 rport->scsi_target_id, SCAN_WILD_CARD,
3718 SCSI_SCAN_RESCAN);
3719 }
3720
3721 spin_lock_irqsave(shost->host_lock, flags);
3722 rport->flags &= ~FC_RPORT_SCAN_PENDING;
3723 spin_unlock_irqrestore(shost->host_lock, flags);
3724 }
3725
3726 /**
3727 * fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3728 * @rport: Remote port that scsi_eh is trying to recover.
3729 *
3730 * This routine can be called from a FC LLD scsi_eh callback. It
3731 * blocks the scsi_eh thread until the fc_rport leaves the
3732 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3733 * necessary to avoid the scsi_eh failing recovery actions for blocked
3734 * rports which would lead to offlined SCSI devices.
3735 *
3736 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3737 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3738 * passed back to scsi_eh.
3739 */
fc_block_rport(struct fc_rport * rport)3740 int fc_block_rport(struct fc_rport *rport)
3741 {
3742 struct Scsi_Host *shost = rport_to_shost(rport);
3743 unsigned long flags;
3744
3745 spin_lock_irqsave(shost->host_lock, flags);
3746 while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3747 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3748 spin_unlock_irqrestore(shost->host_lock, flags);
3749 msleep(1000);
3750 spin_lock_irqsave(shost->host_lock, flags);
3751 }
3752 spin_unlock_irqrestore(shost->host_lock, flags);
3753
3754 if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3755 return FAST_IO_FAIL;
3756
3757 return 0;
3758 }
3759 EXPORT_SYMBOL(fc_block_rport);
3760
3761 /**
3762 * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3763 * @cmnd: SCSI command that scsi_eh is trying to recover
3764 *
3765 * This routine can be called from a FC LLD scsi_eh callback. It
3766 * blocks the scsi_eh thread until the fc_rport leaves the
3767 * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3768 * necessary to avoid the scsi_eh failing recovery actions for blocked
3769 * rports which would lead to offlined SCSI devices.
3770 *
3771 * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3772 * FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3773 * passed back to scsi_eh.
3774 */
fc_block_scsi_eh(struct scsi_cmnd * cmnd)3775 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3776 {
3777 struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3778
3779 if (WARN_ON_ONCE(!rport))
3780 return FAST_IO_FAIL;
3781
3782 return fc_block_rport(rport);
3783 }
3784 EXPORT_SYMBOL(fc_block_scsi_eh);
3785
3786 /*
3787 * fc_eh_should_retry_cmd - Checks if the cmd should be retried or not
3788 * @scmd: The SCSI command to be checked
3789 *
3790 * This checks the rport state to decide if a cmd is
3791 * retryable.
3792 *
3793 * Returns: true if the rport state is not in marginal state.
3794 */
fc_eh_should_retry_cmd(struct scsi_cmnd * scmd)3795 bool fc_eh_should_retry_cmd(struct scsi_cmnd *scmd)
3796 {
3797 struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
3798
3799 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3800 (scsi_cmd_to_rq(scmd)->cmd_flags & REQ_FAILFAST_TRANSPORT)) {
3801 set_host_byte(scmd, DID_TRANSPORT_MARGINAL);
3802 return false;
3803 }
3804 return true;
3805 }
3806 EXPORT_SYMBOL_GPL(fc_eh_should_retry_cmd);
3807
3808 /**
3809 * fc_vport_setup - allocates and creates a FC virtual port.
3810 * @shost: scsi host the virtual port is connected to.
3811 * @channel: Channel on shost port connected to.
3812 * @pdev: parent device for vport
3813 * @ids: The world wide names, FC4 port roles, etc for
3814 * the virtual port.
3815 * @ret_vport: The pointer to the created vport.
3816 *
3817 * Allocates and creates the vport structure, calls the parent host
3818 * to instantiate the vport, this completes w/ class and sysfs creation.
3819 *
3820 * Notes:
3821 * This routine assumes no locks are held on entry.
3822 */
3823 static int
fc_vport_setup(struct Scsi_Host * shost,int channel,struct device * pdev,struct fc_vport_identifiers * ids,struct fc_vport ** ret_vport)3824 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3825 struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3826 {
3827 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3828 struct fc_internal *fci = to_fc_internal(shost->transportt);
3829 struct fc_vport *vport;
3830 struct device *dev;
3831 unsigned long flags;
3832 size_t size;
3833 int error;
3834
3835 *ret_vport = NULL;
3836
3837 if ( ! fci->f->vport_create)
3838 return -ENOENT;
3839
3840 size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3841 vport = kzalloc(size, GFP_KERNEL);
3842 if (unlikely(!vport)) {
3843 printk(KERN_ERR "%s: allocation failure\n", __func__);
3844 return -ENOMEM;
3845 }
3846
3847 vport->vport_state = FC_VPORT_UNKNOWN;
3848 vport->vport_last_state = FC_VPORT_UNKNOWN;
3849 vport->node_name = ids->node_name;
3850 vport->port_name = ids->port_name;
3851 vport->roles = ids->roles;
3852 vport->vport_type = ids->vport_type;
3853 if (fci->f->dd_fcvport_size)
3854 vport->dd_data = &vport[1];
3855 vport->shost = shost;
3856 vport->channel = channel;
3857 vport->flags = FC_VPORT_CREATING;
3858 INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3859
3860 spin_lock_irqsave(shost->host_lock, flags);
3861
3862 if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3863 spin_unlock_irqrestore(shost->host_lock, flags);
3864 kfree(vport);
3865 return -ENOSPC;
3866 }
3867 fc_host->npiv_vports_inuse++;
3868 vport->number = fc_host->next_vport_number++;
3869 list_add_tail(&vport->peers, &fc_host->vports);
3870 scsi_host_get(shost); /* for fc_host->vport list */
3871
3872 spin_unlock_irqrestore(shost->host_lock, flags);
3873
3874 dev = &vport->dev;
3875 device_initialize(dev); /* takes self reference */
3876 dev->parent = get_device(pdev); /* takes parent reference */
3877 dev->release = fc_vport_dev_release;
3878 dev_set_name(dev, "vport-%d:%d-%d",
3879 shost->host_no, channel, vport->number);
3880 transport_setup_device(dev);
3881
3882 error = device_add(dev);
3883 if (error) {
3884 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3885 goto delete_vport;
3886 }
3887 transport_add_device(dev);
3888 transport_configure_device(dev);
3889
3890 error = fci->f->vport_create(vport, ids->disable);
3891 if (error) {
3892 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3893 goto delete_vport_all;
3894 }
3895
3896 /*
3897 * if the parent isn't the physical adapter's Scsi_Host, ensure
3898 * the Scsi_Host at least contains a symlink to the vport.
3899 */
3900 if (pdev != &shost->shost_gendev) {
3901 error = sysfs_create_link(&shost->shost_gendev.kobj,
3902 &dev->kobj, dev_name(dev));
3903 if (error)
3904 printk(KERN_ERR
3905 "%s: Cannot create vport symlinks for "
3906 "%s, err=%d\n",
3907 __func__, dev_name(dev), error);
3908 }
3909 spin_lock_irqsave(shost->host_lock, flags);
3910 vport->flags &= ~FC_VPORT_CREATING;
3911 spin_unlock_irqrestore(shost->host_lock, flags);
3912
3913 dev_printk(KERN_NOTICE, pdev,
3914 "%s created via shost%d channel %d\n", dev_name(dev),
3915 shost->host_no, channel);
3916
3917 *ret_vport = vport;
3918
3919 return 0;
3920
3921 delete_vport_all:
3922 transport_remove_device(dev);
3923 device_del(dev);
3924 delete_vport:
3925 transport_destroy_device(dev);
3926 spin_lock_irqsave(shost->host_lock, flags);
3927 list_del(&vport->peers);
3928 scsi_host_put(shost); /* for fc_host->vport list */
3929 fc_host->npiv_vports_inuse--;
3930 spin_unlock_irqrestore(shost->host_lock, flags);
3931 put_device(dev->parent);
3932 kfree(vport);
3933
3934 return error;
3935 }
3936
3937 /**
3938 * fc_vport_create - Admin App or LLDD requests creation of a vport
3939 * @shost: scsi host the virtual port is connected to.
3940 * @channel: channel on shost port connected to.
3941 * @ids: The world wide names, FC4 port roles, etc for
3942 * the virtual port.
3943 *
3944 * Notes:
3945 * This routine assumes no locks are held on entry.
3946 */
3947 struct fc_vport *
fc_vport_create(struct Scsi_Host * shost,int channel,struct fc_vport_identifiers * ids)3948 fc_vport_create(struct Scsi_Host *shost, int channel,
3949 struct fc_vport_identifiers *ids)
3950 {
3951 int stat;
3952 struct fc_vport *vport;
3953
3954 stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3955 ids, &vport);
3956 return stat ? NULL : vport;
3957 }
3958 EXPORT_SYMBOL(fc_vport_create);
3959
3960 /**
3961 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3962 * @vport: fc_vport to be terminated
3963 *
3964 * Calls the LLDD vport_delete() function, then deallocates and removes
3965 * the vport from the shost and object tree.
3966 *
3967 * Notes:
3968 * This routine assumes no locks are held on entry.
3969 */
3970 int
fc_vport_terminate(struct fc_vport * vport)3971 fc_vport_terminate(struct fc_vport *vport)
3972 {
3973 struct Scsi_Host *shost = vport_to_shost(vport);
3974 struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3975 struct fc_internal *i = to_fc_internal(shost->transportt);
3976 struct device *dev = &vport->dev;
3977 unsigned long flags;
3978 int stat;
3979
3980 if (i->f->vport_delete)
3981 stat = i->f->vport_delete(vport);
3982 else
3983 stat = -ENOENT;
3984
3985 spin_lock_irqsave(shost->host_lock, flags);
3986 vport->flags &= ~FC_VPORT_DELETING;
3987 if (!stat) {
3988 vport->flags |= FC_VPORT_DELETED;
3989 list_del(&vport->peers);
3990 fc_host->npiv_vports_inuse--;
3991 scsi_host_put(shost); /* for fc_host->vport list */
3992 }
3993 spin_unlock_irqrestore(shost->host_lock, flags);
3994
3995 if (stat)
3996 return stat;
3997
3998 if (dev->parent != &shost->shost_gendev)
3999 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
4000 transport_remove_device(dev);
4001 device_del(dev);
4002 transport_destroy_device(dev);
4003
4004 /*
4005 * Removing our self-reference should mean our
4006 * release function gets called, which will drop the remaining
4007 * parent reference and free the data structure.
4008 */
4009 put_device(dev); /* for self-reference */
4010
4011 return 0; /* SUCCESS */
4012 }
4013 EXPORT_SYMBOL(fc_vport_terminate);
4014
4015 /**
4016 * fc_vport_sched_delete - workq-based delete request for a vport
4017 * @work: vport to be deleted.
4018 */
4019 static void
fc_vport_sched_delete(struct work_struct * work)4020 fc_vport_sched_delete(struct work_struct *work)
4021 {
4022 struct fc_vport *vport =
4023 container_of(work, struct fc_vport, vport_delete_work);
4024 int stat;
4025
4026 stat = fc_vport_terminate(vport);
4027 if (stat)
4028 dev_printk(KERN_ERR, vport->dev.parent,
4029 "%s: %s could not be deleted created via "
4030 "shost%d channel %d - error %d\n", __func__,
4031 dev_name(&vport->dev), vport->shost->host_no,
4032 vport->channel, stat);
4033 }
4034
4035
4036 /*
4037 * BSG support
4038 */
4039
4040 /**
4041 * fc_bsg_job_timeout - handler for when a bsg request timesout
4042 * @req: request that timed out
4043 */
4044 static enum blk_eh_timer_return
fc_bsg_job_timeout(struct request * req)4045 fc_bsg_job_timeout(struct request *req)
4046 {
4047 struct bsg_job *job = blk_mq_rq_to_pdu(req);
4048 struct Scsi_Host *shost = fc_bsg_to_shost(job);
4049 struct fc_rport *rport = fc_bsg_to_rport(job);
4050 struct fc_internal *i = to_fc_internal(shost->transportt);
4051 int err = 0, inflight = 0;
4052
4053 if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
4054 return BLK_EH_RESET_TIMER;
4055
4056 inflight = bsg_job_get(job);
4057
4058 if (inflight && i->f->bsg_timeout) {
4059 /* call LLDD to abort the i/o as it has timed out */
4060 err = i->f->bsg_timeout(job);
4061 if (err == -EAGAIN) {
4062 bsg_job_put(job);
4063 return BLK_EH_RESET_TIMER;
4064 } else if (err)
4065 printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
4066 "abort failed with status %d\n", err);
4067 }
4068
4069 /* the blk_end_sync_io() doesn't check the error */
4070 if (inflight)
4071 blk_mq_end_request(req, BLK_STS_IOERR);
4072 return BLK_EH_DONE;
4073 }
4074
4075 /**
4076 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
4077 * @shost: scsi host rport attached to
4078 * @job: bsg job to be processed
4079 */
fc_bsg_host_dispatch(struct Scsi_Host * shost,struct bsg_job * job)4080 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4081 {
4082 struct fc_internal *i = to_fc_internal(shost->transportt);
4083 struct fc_bsg_request *bsg_request = job->request;
4084 struct fc_bsg_reply *bsg_reply = job->reply;
4085 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4086 int ret;
4087
4088 /* check if we really have all the request data needed */
4089 if (job->request_len < cmdlen) {
4090 ret = -ENOMSG;
4091 goto fail_host_msg;
4092 }
4093
4094 /* Validate the host command */
4095 switch (bsg_request->msgcode) {
4096 case FC_BSG_HST_ADD_RPORT:
4097 cmdlen += sizeof(struct fc_bsg_host_add_rport);
4098 break;
4099
4100 case FC_BSG_HST_DEL_RPORT:
4101 cmdlen += sizeof(struct fc_bsg_host_del_rport);
4102 break;
4103
4104 case FC_BSG_HST_ELS_NOLOGIN:
4105 cmdlen += sizeof(struct fc_bsg_host_els);
4106 /* there better be a xmt and rcv payloads */
4107 if ((!job->request_payload.payload_len) ||
4108 (!job->reply_payload.payload_len)) {
4109 ret = -EINVAL;
4110 goto fail_host_msg;
4111 }
4112 break;
4113
4114 case FC_BSG_HST_CT:
4115 cmdlen += sizeof(struct fc_bsg_host_ct);
4116 /* there better be xmt and rcv payloads */
4117 if ((!job->request_payload.payload_len) ||
4118 (!job->reply_payload.payload_len)) {
4119 ret = -EINVAL;
4120 goto fail_host_msg;
4121 }
4122 break;
4123
4124 case FC_BSG_HST_VENDOR:
4125 cmdlen += sizeof(struct fc_bsg_host_vendor);
4126 if ((shost->hostt->vendor_id == 0L) ||
4127 (bsg_request->rqst_data.h_vendor.vendor_id !=
4128 shost->hostt->vendor_id)) {
4129 ret = -ESRCH;
4130 goto fail_host_msg;
4131 }
4132 break;
4133
4134 default:
4135 ret = -EBADR;
4136 goto fail_host_msg;
4137 }
4138
4139 ret = i->f->bsg_request(job);
4140 if (!ret)
4141 return 0;
4142
4143 fail_host_msg:
4144 /* return the errno failure code as the only status */
4145 BUG_ON(job->reply_len < sizeof(uint32_t));
4146 bsg_reply->reply_payload_rcv_len = 0;
4147 bsg_reply->result = ret;
4148 job->reply_len = sizeof(uint32_t);
4149 bsg_job_done(job, bsg_reply->result,
4150 bsg_reply->reply_payload_rcv_len);
4151 return 0;
4152 }
4153
4154
4155 /*
4156 * fc_bsg_goose_queue - restart rport queue in case it was stopped
4157 * @rport: rport to be restarted
4158 */
4159 static void
fc_bsg_goose_queue(struct fc_rport * rport)4160 fc_bsg_goose_queue(struct fc_rport *rport)
4161 {
4162 struct request_queue *q = rport->rqst_q;
4163
4164 if (q)
4165 blk_mq_run_hw_queues(q, true);
4166 }
4167
4168 /**
4169 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
4170 * @shost: scsi host rport attached to
4171 * @job: bsg job to be processed
4172 */
fc_bsg_rport_dispatch(struct Scsi_Host * shost,struct bsg_job * job)4173 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4174 {
4175 struct fc_internal *i = to_fc_internal(shost->transportt);
4176 struct fc_bsg_request *bsg_request = job->request;
4177 struct fc_bsg_reply *bsg_reply = job->reply;
4178 int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4179 int ret;
4180
4181 /* check if we really have all the request data needed */
4182 if (job->request_len < cmdlen) {
4183 ret = -ENOMSG;
4184 goto fail_rport_msg;
4185 }
4186
4187 /* Validate the rport command */
4188 switch (bsg_request->msgcode) {
4189 case FC_BSG_RPT_ELS:
4190 cmdlen += sizeof(struct fc_bsg_rport_els);
4191 goto check_bidi;
4192
4193 case FC_BSG_RPT_CT:
4194 cmdlen += sizeof(struct fc_bsg_rport_ct);
4195 check_bidi:
4196 /* there better be xmt and rcv payloads */
4197 if ((!job->request_payload.payload_len) ||
4198 (!job->reply_payload.payload_len)) {
4199 ret = -EINVAL;
4200 goto fail_rport_msg;
4201 }
4202 break;
4203 default:
4204 ret = -EBADR;
4205 goto fail_rport_msg;
4206 }
4207
4208 ret = i->f->bsg_request(job);
4209 if (!ret)
4210 return 0;
4211
4212 fail_rport_msg:
4213 /* return the errno failure code as the only status */
4214 BUG_ON(job->reply_len < sizeof(uint32_t));
4215 bsg_reply->reply_payload_rcv_len = 0;
4216 bsg_reply->result = ret;
4217 job->reply_len = sizeof(uint32_t);
4218 bsg_job_done(job, bsg_reply->result,
4219 bsg_reply->reply_payload_rcv_len);
4220 return 0;
4221 }
4222
fc_bsg_dispatch(struct bsg_job * job)4223 static int fc_bsg_dispatch(struct bsg_job *job)
4224 {
4225 struct Scsi_Host *shost = fc_bsg_to_shost(job);
4226
4227 if (scsi_is_fc_rport(job->dev))
4228 return fc_bsg_rport_dispatch(shost, job);
4229 else
4230 return fc_bsg_host_dispatch(shost, job);
4231 }
4232
fc_bsg_rport_prep(struct fc_rport * rport)4233 static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
4234 {
4235 if (rport->port_state == FC_PORTSTATE_BLOCKED &&
4236 !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
4237 return BLK_STS_RESOURCE;
4238
4239 if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
4240 (rport->port_state != FC_PORTSTATE_MARGINAL))
4241 return BLK_STS_IOERR;
4242
4243 return BLK_STS_OK;
4244 }
4245
4246
fc_bsg_dispatch_prep(struct bsg_job * job)4247 static int fc_bsg_dispatch_prep(struct bsg_job *job)
4248 {
4249 struct fc_rport *rport = fc_bsg_to_rport(job);
4250 blk_status_t ret;
4251
4252 ret = fc_bsg_rport_prep(rport);
4253 switch (ret) {
4254 case BLK_STS_OK:
4255 break;
4256 case BLK_STS_RESOURCE:
4257 return -EAGAIN;
4258 default:
4259 return -EIO;
4260 }
4261
4262 return fc_bsg_dispatch(job);
4263 }
4264
4265 /**
4266 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4267 * @shost: shost for fc_host
4268 * @fc_host: fc_host adding the structures to
4269 */
4270 static int
fc_bsg_hostadd(struct Scsi_Host * shost,struct fc_host_attrs * fc_host)4271 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4272 {
4273 struct device *dev = &shost->shost_gendev;
4274 struct fc_internal *i = to_fc_internal(shost->transportt);
4275 struct request_queue *q;
4276 char bsg_name[20];
4277
4278 fc_host->rqst_q = NULL;
4279
4280 if (!i->f->bsg_request)
4281 return -ENOTSUPP;
4282
4283 snprintf(bsg_name, sizeof(bsg_name),
4284 "fc_host%d", shost->host_no);
4285
4286 q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, fc_bsg_job_timeout,
4287 i->f->dd_bsg_size);
4288 if (IS_ERR(q)) {
4289 dev_err(dev,
4290 "fc_host%d: bsg interface failed to initialize - setup queue\n",
4291 shost->host_no);
4292 return PTR_ERR(q);
4293 }
4294 __scsi_init_queue(shost, q);
4295 blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4296 fc_host->rqst_q = q;
4297 return 0;
4298 }
4299
4300 /**
4301 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4302 * @shost: shost that rport is attached to
4303 * @rport: rport that the bsg hooks are being attached to
4304 */
4305 static int
fc_bsg_rportadd(struct Scsi_Host * shost,struct fc_rport * rport)4306 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4307 {
4308 struct device *dev = &rport->dev;
4309 struct fc_internal *i = to_fc_internal(shost->transportt);
4310 struct request_queue *q;
4311
4312 rport->rqst_q = NULL;
4313
4314 if (!i->f->bsg_request)
4315 return -ENOTSUPP;
4316
4317 q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch_prep,
4318 fc_bsg_job_timeout, i->f->dd_bsg_size);
4319 if (IS_ERR(q)) {
4320 dev_err(dev, "failed to setup bsg queue\n");
4321 return PTR_ERR(q);
4322 }
4323 __scsi_init_queue(shost, q);
4324 blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4325 rport->rqst_q = q;
4326 return 0;
4327 }
4328
4329
4330 /**
4331 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4332 * @q: the request_queue that is to be torn down.
4333 *
4334 * Notes:
4335 * Before unregistering the queue empty any requests that are blocked
4336 *
4337 *
4338 */
4339 static void
fc_bsg_remove(struct request_queue * q)4340 fc_bsg_remove(struct request_queue *q)
4341 {
4342 bsg_remove_queue(q);
4343 }
4344
4345
4346 /* Original Author: Martin Hicks */
4347 MODULE_AUTHOR("James Smart");
4348 MODULE_DESCRIPTION("FC Transport Attributes");
4349 MODULE_LICENSE("GPL");
4350
4351 module_init(fc_transport_init);
4352 module_exit(fc_transport_exit);
4353