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