1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* FiberChannel transport specific attributes exported to sysfs.
4	*
5	* Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved.
6	* Copyright (C) 2004-2007 James Smart, Emulex Corporation
7	* Rewrite for host, target, device, and remote port attributes,
8	* statistics, and service functions...
9	* Add vports, etc
10	*/
11	#include <linux/module.h>
12	#include <linux/init.h>
13	#include <linux/slab.h>
14	#include <linux/delay.h>
15	#include <linux/kernel.h>
16	#include <linux/bsg-lib.h>
17	#include <scsi/scsi_device.h>
18	#include <scsi/scsi_host.h>
19	#include <scsi/scsi_transport.h>
20	#include <scsi/scsi_transport_fc.h>
21	#include <scsi/scsi_cmnd.h>
22	#include <net/netlink.h>
23	#include <scsi/scsi_netlink_fc.h>
24	#include <scsi/scsi_bsg_fc.h>
25	#include <uapi/scsi/fc/fc_els.h>
26	#include "scsi_priv.h"
27
28	static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
29	static void fc_vport_sched_delete(struct work_struct *work);
30	static int fc_vport_setup(struct Scsi_Host *shost, int channel,
31	struct device *pdev, struct fc_vport_identifiers *ids,
32	struct fc_vport **vport);
33	static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
34	static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
35	static void fc_bsg_remove(struct request_queue *);
36	static void fc_bsg_goose_queue(struct fc_rport *);
37	static void fc_li_stats_update(u16 event_type,
38	struct fc_fpin_stats *stats);
39	static void fc_delivery_stats_update(u32 reason_code,
40	struct fc_fpin_stats *stats);
41	static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
42
43	/*
44	* Module Parameters
45	*/
46
47	/*
48	* dev_loss_tmo: the default number of seconds that the FC transport
49	* should insulate the loss of a remote port.
50	* The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
51	*/
52	static unsigned int fc_dev_loss_tmo = 60; /* seconds */
53
54	module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
55	MODULE_PARM_DESC(dev_loss_tmo,
56	"Maximum number of seconds that the FC transport should"
57	" insulate the loss of a remote port. Once this value is"
58	" exceeded, the scsi target is removed. Value should be"
59	" between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
60	" fast_io_fail_tmo is not set.");
61
62	/*
63	* Redefine so that we can have same named attributes in the
64	* sdev/starget/host objects.
65	*/
66	#define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store) \
67	struct device_attribute device_attr_##_prefix##_##_name = \
68	__ATTR(_name,_mode,_show,_store)
69
70	#define fc_enum_name_search(title, table_type, table) \
71	static const char *get_fc_##title##_name(enum table_type table_key) \
72	{ \
73	int i; \
74	char *name = NULL; \
75	\
76	for (i = 0; i < ARRAY_SIZE(table); i++) { \
77	if (table[i].value == table_key) { \
78	name = table[i].name; \
79	break; \
80	} \
81	} \
82	return name; \
83	}
84
85	#define fc_enum_name_match(title, table_type, table) \
86	static int get_fc_##title##_match(const char *table_key, \
87	enum table_type *value) \
88	{ \
89	int i; \
90	\
91	for (i = 0; i < ARRAY_SIZE(table); i++) { \
92	if (strncmp(table_key, table[i].name, \
93	table[i].matchlen) == 0) { \
94	*value = table[i].value; \
95	return 0; /* success */ \
96	} \
97	} \
98	return 1; /* failure */ \
99	}
100
101
102	/* Convert fc_port_type values to ascii string name */
103	static struct {
104	enum fc_port_type value;
105	char *name;
106	} fc_port_type_names[] = {
107	{ FC_PORTTYPE_UNKNOWN, "Unknown" },
108	{ FC_PORTTYPE_OTHER, "Other" },
109	{ FC_PORTTYPE_NOTPRESENT, "Not Present" },
110	{ FC_PORTTYPE_NPORT, "NPort (fabric via point-to-point)" },
111	{ FC_PORTTYPE_NLPORT, "NLPort (fabric via loop)" },
112	{ FC_PORTTYPE_LPORT, "LPort (private loop)" },
113	{ FC_PORTTYPE_PTP, "Point-To-Point (direct nport connection)" },
114	{ FC_PORTTYPE_NPIV, "NPIV VPORT" },
115	};
116	fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
117	#define FC_PORTTYPE_MAX_NAMELEN 50
118
119	/* Reuse fc_port_type enum function for vport_type */
120	#define get_fc_vport_type_name get_fc_port_type_name
121
122
123	/* Convert fc_host_event_code values to ascii string name */
124	static const struct {
125	enum fc_host_event_code value;
126	char *name;
127	} fc_host_event_code_names[] = {
128	{ FCH_EVT_LIP, "lip" },
129	{ FCH_EVT_LINKUP, "link_up" },
130	{ FCH_EVT_LINKDOWN, "link_down" },
131	{ FCH_EVT_LIPRESET, "lip_reset" },
132	{ FCH_EVT_RSCN, "rscn" },
133	{ FCH_EVT_ADAPTER_CHANGE, "adapter_chg" },
134	{ FCH_EVT_PORT_UNKNOWN, "port_unknown" },
135	{ FCH_EVT_PORT_ONLINE, "port_online" },
136	{ FCH_EVT_PORT_OFFLINE, "port_offline" },
137	{ FCH_EVT_PORT_FABRIC, "port_fabric" },
138	{ FCH_EVT_LINK_UNKNOWN, "link_unknown" },
139	{ FCH_EVT_LINK_FPIN, "link_FPIN" },
140	{ FCH_EVT_LINK_FPIN_ACK, "link_FPIN_ACK" },
141	{ FCH_EVT_VENDOR_UNIQUE, "vendor_unique" },
142	};
143	fc_enum_name_search(host_event_code, fc_host_event_code,
144	fc_host_event_code_names)
145	#define FC_HOST_EVENT_CODE_MAX_NAMELEN 30
146
147
148	/* Convert fc_port_state values to ascii string name */
149	static struct {
150	enum fc_port_state value;
151	char *name;
152	int matchlen;
153	} fc_port_state_names[] = {
154	{ FC_PORTSTATE_UNKNOWN, "Unknown", 7},
155	{ FC_PORTSTATE_NOTPRESENT, "Not Present", 11 },
156	{ FC_PORTSTATE_ONLINE, "Online", 6 },
157	{ FC_PORTSTATE_OFFLINE, "Offline", 7 },
158	{ FC_PORTSTATE_BLOCKED, "Blocked", 7 },
159	{ FC_PORTSTATE_BYPASSED, "Bypassed", 8 },
160	{ FC_PORTSTATE_DIAGNOSTICS, "Diagnostics", 11 },
161	{ FC_PORTSTATE_LINKDOWN, "Linkdown", 8 },
162	{ FC_PORTSTATE_ERROR, "Error", 5 },
163	{ FC_PORTSTATE_LOOPBACK, "Loopback", 8 },
164	{ FC_PORTSTATE_DELETED, "Deleted", 7 },
165	{ FC_PORTSTATE_MARGINAL, "Marginal", 8 },
166	};
167	fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
168	fc_enum_name_match(port_state, fc_port_state, fc_port_state_names)
169	#define FC_PORTSTATE_MAX_NAMELEN 20
170
171
172	/* Convert fc_vport_state values to ascii string name */
173	static struct {
174	enum fc_vport_state value;
175	char *name;
176	} fc_vport_state_names[] = {
177	{ FC_VPORT_UNKNOWN, "Unknown" },
178	{ FC_VPORT_ACTIVE, "Active" },
179	{ FC_VPORT_DISABLED, "Disabled" },
180	{ FC_VPORT_LINKDOWN, "Linkdown" },
181	{ FC_VPORT_INITIALIZING, "Initializing" },
182	{ FC_VPORT_NO_FABRIC_SUPP, "No Fabric Support" },
183	{ FC_VPORT_NO_FABRIC_RSCS, "No Fabric Resources" },
184	{ FC_VPORT_FABRIC_LOGOUT, "Fabric Logout" },
185	{ FC_VPORT_FABRIC_REJ_WWN, "Fabric Rejected WWN" },
186	{ FC_VPORT_FAILED, "VPort Failed" },
187	};
188	fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
189	#define FC_VPORTSTATE_MAX_NAMELEN 24
190
191	/* Reuse fc_vport_state enum function for vport_last_state */
192	#define get_fc_vport_last_state_name get_fc_vport_state_name
193
194
195	/* Convert fc_tgtid_binding_type values to ascii string name */
196	static const struct {
197	enum fc_tgtid_binding_type value;
198	char *name;
199	int matchlen;
200	} fc_tgtid_binding_type_names[] = {
201	{ FC_TGTID_BIND_NONE, "none", 4 },
202	{ FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
203	{ FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
204	{ FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
205	};
206	fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
207	fc_tgtid_binding_type_names)
208	fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
209	fc_tgtid_binding_type_names)
210	#define FC_BINDTYPE_MAX_NAMELEN 30
211
212
213	#define fc_bitfield_name_search(title, table) \
214	static ssize_t \
215	get_fc_##title##_names(u32 table_key, char *buf) \
216	{ \
217	char *prefix = ""; \
218	ssize_t len = 0; \
219	int i; \
220	\
221	for (i = 0; i < ARRAY_SIZE(table); i++) { \
222	if (table[i].value & table_key) { \
223	len += sprintf(buf + len, "%s%s", \
224	prefix, table[i].name); \
225	prefix = ", "; \
226	} \
227	} \
228	len += sprintf(buf + len, "\n"); \
229	return len; \
230	}
231
232
233	/* Convert FC_COS bit values to ascii string name */
234	static const struct {
235	u32 value;
236	char *name;
237	} fc_cos_names[] = {
238	{ FC_COS_CLASS1, "Class 1" },
239	{ FC_COS_CLASS2, "Class 2" },
240	{ FC_COS_CLASS3, "Class 3" },
241	{ FC_COS_CLASS4, "Class 4" },
242	{ FC_COS_CLASS6, "Class 6" },
243	};
244	fc_bitfield_name_search(cos, fc_cos_names)
245
246
247	/* Convert FC_PORTSPEED bit values to ascii string name */
248	static const struct {
249	u32 value;
250	char *name;
251	} fc_port_speed_names[] = {
252	{ FC_PORTSPEED_1GBIT, "1 Gbit" },
253	{ FC_PORTSPEED_2GBIT, "2 Gbit" },
254	{ FC_PORTSPEED_4GBIT, "4 Gbit" },
255	{ FC_PORTSPEED_10GBIT, "10 Gbit" },
256	{ FC_PORTSPEED_8GBIT, "8 Gbit" },
257	{ FC_PORTSPEED_16GBIT, "16 Gbit" },
258	{ FC_PORTSPEED_32GBIT, "32 Gbit" },
259	{ FC_PORTSPEED_20GBIT, "20 Gbit" },
260	{ FC_PORTSPEED_40GBIT, "40 Gbit" },
261	{ FC_PORTSPEED_50GBIT, "50 Gbit" },
262	{ FC_PORTSPEED_100GBIT, "100 Gbit" },
263	{ FC_PORTSPEED_25GBIT, "25 Gbit" },
264	{ FC_PORTSPEED_64GBIT, "64 Gbit" },
265	{ FC_PORTSPEED_128GBIT, "128 Gbit" },
266	{ FC_PORTSPEED_256GBIT, "256 Gbit" },
267	{ FC_PORTSPEED_NOT_NEGOTIATED, "Not Negotiated" },
268	};
269	fc_bitfield_name_search(port_speed, fc_port_speed_names)
270
271
272	static int
273	show_fc_fc4s (char *buf, u8 *fc4_list)
274	{
275	int i, len=0;
276
277	for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
278	len += sprintf(buf: buf + len , fmt: "0x%02x ", *fc4_list);
279	len += sprintf(buf: buf + len, fmt: "\n");
280	return len;
281	}
282
283
284	/* Convert FC_PORT_ROLE bit values to ascii string name */
285	static const struct {
286	u32 value;
287	char *name;
288	} fc_port_role_names[] = {
289	{ FC_PORT_ROLE_FCP_TARGET, "FCP Target" },
290	{ FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
291	{ FC_PORT_ROLE_IP_PORT, "IP Port" },
292	{ FC_PORT_ROLE_FCP_DUMMY_INITIATOR, "FCP Dummy Initiator" },
293	{ FC_PORT_ROLE_NVME_INITIATOR, "NVMe Initiator" },
294	{ FC_PORT_ROLE_NVME_TARGET, "NVMe Target" },
295	{ FC_PORT_ROLE_NVME_DISCOVERY, "NVMe Discovery" },
296	};
297	fc_bitfield_name_search(port_roles, fc_port_role_names)
298
299	/*
300	* Define roles that are specific to port_id. Values are relative to ROLE_MASK.
301	*/
302	#define FC_WELLKNOWN_PORTID_MASK 0xfffff0
303	#define FC_WELLKNOWN_ROLE_MASK 0x00000f
304	#define FC_FPORT_PORTID 0x00000e
305	#define FC_FABCTLR_PORTID 0x00000d
306	#define FC_DIRSRVR_PORTID 0x00000c
307	#define FC_TIMESRVR_PORTID 0x00000b
308	#define FC_MGMTSRVR_PORTID 0x00000a
309
310
311	static void fc_timeout_deleted_rport(struct work_struct *work);
312	static void fc_timeout_fail_rport_io(struct work_struct *work);
313	static void fc_scsi_scan_rport(struct work_struct *work);
314
315	/*
316	* Attribute counts pre object type...
317	* Increase these values if you add attributes
318	*/
319	#define FC_STARGET_NUM_ATTRS 3
320	#define FC_RPORT_NUM_ATTRS 10
321	#define FC_VPORT_NUM_ATTRS 9
322	#define FC_HOST_NUM_ATTRS 29
323
324	struct fc_internal {
325	struct scsi_transport_template t;
326	struct fc_function_template *f;
327
328	/*
329	* For attributes : each object has :
330	* An array of the actual attributes structures
331	* An array of null-terminated pointers to the attribute
332	* structures - used for mid-layer interaction.
333	*
334	* The attribute containers for the starget and host are are
335	* part of the midlayer. As the remote port is specific to the
336	* fc transport, we must provide the attribute container.
337	*/
338	struct device_attribute private_starget_attrs[
339	FC_STARGET_NUM_ATTRS];
340	struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
341
342	struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
343	struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
344
345	struct transport_container rport_attr_cont;
346	struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
347	struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
348
349	struct transport_container vport_attr_cont;
350	struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
351	struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
352	};
353
354	#define to_fc_internal(tmpl) container_of(tmpl, struct fc_internal, t)
355
356	static int fc_target_setup(struct transport_container *tc, struct device *dev,
357	struct device *cdev)
358	{
359	struct scsi_target *starget = to_scsi_target(dev);
360	struct fc_rport *rport = starget_to_rport(starget);
361
362	/*
363	* if parent is remote port, use values from remote port.
364	* Otherwise, this host uses the fc_transport, but not the
365	* remote port interface. As such, initialize to known non-values.
366	*/
367	if (rport) {
368	fc_starget_node_name(starget) = rport->node_name;
369	fc_starget_port_name(starget) = rport->port_name;
370	fc_starget_port_id(starget) = rport->port_id;
371	} else {
372	fc_starget_node_name(starget) = -1;
373	fc_starget_port_name(starget) = -1;
374	fc_starget_port_id(starget) = -1;
375	}
376
377	return 0;
378	}
379
380	static DECLARE_TRANSPORT_CLASS(fc_transport_class,
381	"fc_transport",
382	fc_target_setup,
383	NULL,
384	NULL);
385
386	static int fc_host_setup(struct transport_container *tc, struct device *dev,
387	struct device *cdev)
388	{
389	struct Scsi_Host *shost = dev_to_shost(dev);
390	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
391
392	/*
393	* Set default values easily detected by the midlayer as
394	* failure cases. The scsi lldd is responsible for initializing
395	* all transport attributes to valid values per host.
396	*/
397	fc_host->node_name = -1;
398	fc_host->port_name = -1;
399	fc_host->permanent_port_name = -1;
400	fc_host->supported_classes = FC_COS_UNSPECIFIED;
401	memset(fc_host->supported_fc4s, 0,
402	sizeof(fc_host->supported_fc4s));
403	fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
404	fc_host->maxframe_size = -1;
405	fc_host->max_npiv_vports = 0;
406	memset(fc_host->serial_number, 0,
407	sizeof(fc_host->serial_number));
408	memset(fc_host->manufacturer, 0,
409	sizeof(fc_host->manufacturer));
410	memset(fc_host->model, 0,
411	sizeof(fc_host->model));
412	memset(fc_host->model_description, 0,
413	sizeof(fc_host->model_description));
414	memset(fc_host->hardware_version, 0,
415	sizeof(fc_host->hardware_version));
416	memset(fc_host->driver_version, 0,
417	sizeof(fc_host->driver_version));
418	memset(fc_host->firmware_version, 0,
419	sizeof(fc_host->firmware_version));
420	memset(fc_host->optionrom_version, 0,
421	sizeof(fc_host->optionrom_version));
422
423	fc_host->port_id = -1;
424	fc_host->port_type = FC_PORTTYPE_UNKNOWN;
425	fc_host->port_state = FC_PORTSTATE_UNKNOWN;
426	memset(fc_host->active_fc4s, 0,
427	sizeof(fc_host->active_fc4s));
428	fc_host->speed = FC_PORTSPEED_UNKNOWN;
429	fc_host->fabric_name = -1;
430	memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
431	memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
432	memset(&fc_host->fpin_stats, 0, sizeof(fc_host->fpin_stats));
433
434	fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
435
436	INIT_LIST_HEAD(list: &fc_host->rports);
437	INIT_LIST_HEAD(list: &fc_host->rport_bindings);
438	INIT_LIST_HEAD(list: &fc_host->vports);
439	fc_host->next_rport_number = 0;
440	fc_host->next_target_id = 0;
441	fc_host->next_vport_number = 0;
442	fc_host->npiv_vports_inuse = 0;
443
444	snprintf(buf: fc_host->work_q_name, size: sizeof(fc_host->work_q_name),
445	fmt: "fc_wq_%d", shost->host_no);
446	fc_host->work_q = alloc_workqueue(fmt: "%s", flags: 0, max_active: 0, fc_host->work_q_name);
447	if (!fc_host->work_q)
448	return -ENOMEM;
449
450	fc_host->dev_loss_tmo = fc_dev_loss_tmo;
451	snprintf(buf: fc_host->devloss_work_q_name,
452	size: sizeof(fc_host->devloss_work_q_name),
453	fmt: "fc_dl_%d", shost->host_no);
454	fc_host->devloss_work_q = alloc_workqueue(fmt: "%s", flags: 0, max_active: 0,
455	fc_host->devloss_work_q_name);
456	if (!fc_host->devloss_work_q) {
457	destroy_workqueue(wq: fc_host->work_q);
458	fc_host->work_q = NULL;
459	return -ENOMEM;
460	}
461
462	fc_bsg_hostadd(shost, fc_host);
463	/* ignore any bsg add error - we just can't do sgio */
464
465	return 0;
466	}
467
468	static int fc_host_remove(struct transport_container *tc, struct device *dev,
469	struct device *cdev)
470	{
471	struct Scsi_Host *shost = dev_to_shost(dev);
472	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
473
474	fc_bsg_remove(fc_host->rqst_q);
475	return 0;
476	}
477
478	static DECLARE_TRANSPORT_CLASS(fc_host_class,
479	"fc_host",
480	fc_host_setup,
481	fc_host_remove,
482	NULL);
483
484	/*
485	* Setup and Remove actions for remote ports are handled
486	* in the service functions below.
487	*/
488	static DECLARE_TRANSPORT_CLASS(fc_rport_class,
489	"fc_remote_ports",
490	NULL,
491	NULL,
492	NULL);
493
494	/*
495	* Setup and Remove actions for virtual ports are handled
496	* in the service functions below.
497	*/
498	static DECLARE_TRANSPORT_CLASS(fc_vport_class,
499	"fc_vports",
500	NULL,
501	NULL,
502	NULL);
503
504	/*
505	* Netlink Infrastructure
506	*/
507
508	static atomic_t fc_event_seq;
509
510	/**
511	* fc_get_event_number - Obtain the next sequential FC event number
512	*
513	* Notes:
514	* We could have inlined this, but it would have required fc_event_seq to
515	* be exposed. For now, live with the subroutine call.
516	* Atomic used to avoid lock/unlock...
517	*/
518	u32
519	fc_get_event_number(void)
520	{
521	return atomic_add_return(i: 1, v: &fc_event_seq);
522	}
523	EXPORT_SYMBOL(fc_get_event_number);
524
525	/**
526	* fc_host_post_fc_event - routine to do the work of posting an event
527	* on an fc_host.
528	* @shost: host the event occurred on
529	* @event_number: fc event number obtained from get_fc_event_number()
530	* @event_code: fc_host event being posted
531	* @data_len: amount, in bytes, of event data
532	* @data_buf: pointer to event data
533	* @vendor_id: value for Vendor id
534	*
535	* Notes:
536	* This routine assumes no locks are held on entry.
537	*/
538	void
539	fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
540	enum fc_host_event_code event_code,
541	u32 data_len, char *data_buf, u64 vendor_id)
542	{
543	struct sk_buff *skb;
544	struct nlmsghdr *nlh;
545	struct fc_nl_event *event;
546	const char *name;
547	size_t len, padding;
548	int err;
549
550	if (!data_buf || data_len < 4)
551	data_len = 0;
552
553	if (!scsi_nl_sock) {
554	err = -ENOENT;
555	goto send_fail;
556	}
557
558	len = FC_NL_MSGALIGN(sizeof(*event) - sizeof(event->event_data) + data_len);
559
560	skb = nlmsg_new(payload: len, GFP_KERNEL);
561	if (!skb) {
562	err = -ENOBUFS;
563	goto send_fail;
564	}
565
566	nlh = nlmsg_put(skb, portid: 0, seq: 0, SCSI_TRANSPORT_MSG, payload: len, flags: 0);
567	if (!nlh) {
568	err = -ENOBUFS;
569	goto send_fail_skb;
570	}
571	event = nlmsg_data(nlh);
572
573	INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
574	FC_NL_ASYNC_EVENT, len);
575	event->seconds = ktime_get_real_seconds();
576	event->vendor_id = vendor_id;
577	event->host_no = shost->host_no;
578	event->event_datalen = data_len; /* bytes */
579	event->event_num = event_number;
580	event->event_code = event_code;
581	if (data_len)
582	memcpy(event->event_data_flex, data_buf, data_len);
583	padding = len - offsetof(typeof(*event), event_data_flex) - data_len;
584	memset(event->event_data_flex + data_len, 0, padding);
585
586	nlmsg_multicast(sk: scsi_nl_sock, skb, portid: 0, SCSI_NL_GRP_FC_EVENTS,
587	GFP_KERNEL);
588	return;
589
590	send_fail_skb:
591	kfree_skb(skb);
592	send_fail:
593	name = get_fc_host_event_code_name(table_key: event_code);
594	printk(KERN_WARNING
595	"%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
596	__func__, shost->host_no,
597	(name) ? name : "<unknown>",
598	(data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
599	return;
600	}
601	EXPORT_SYMBOL(fc_host_post_fc_event);
602
603	/**
604	* fc_host_post_event - called to post an even on an fc_host.
605	* @shost: host the event occurred on
606	* @event_number: fc event number obtained from get_fc_event_number()
607	* @event_code: fc_host event being posted
608	* @event_data: 32bits of data for the event being posted
609	*
610	* Notes:
611	* This routine assumes no locks are held on entry.
612	*/
613	void
614	fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
615	enum fc_host_event_code event_code, u32 event_data)
616	{
617	fc_host_post_fc_event(shost, event_number, event_code,
618	(u32)sizeof(u32), (char *)&event_data, 0);
619	}
620	EXPORT_SYMBOL(fc_host_post_event);
621
622
623	/**
624	* fc_host_post_vendor_event - called to post a vendor unique event
625	* on an fc_host
626	* @shost: host the event occurred on
627	* @event_number: fc event number obtained from get_fc_event_number()
628	* @data_len: amount, in bytes, of vendor unique data
629	* @data_buf: pointer to vendor unique data
630	* @vendor_id: Vendor id
631	*
632	* Notes:
633	* This routine assumes no locks are held on entry.
634	*/
635	void
636	fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
637	u32 data_len, char * data_buf, u64 vendor_id)
638	{
639	fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
640	data_len, data_buf, vendor_id);
641	}
642	EXPORT_SYMBOL(fc_host_post_vendor_event);
643
644	/**
645	* fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
646	* @shost: host the fc_rport is associated with
647	* @wwpn: wwpn of the fc_rport device
648	*
649	* Notes:
650	* This routine assumes no locks are held on entry.
651	*/
652	struct fc_rport *
653	fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
654	{
655	struct fc_rport *rport;
656	unsigned long flags;
657
658	spin_lock_irqsave(shost->host_lock, flags);
659
660	list_for_each_entry(rport, &fc_host_rports(shost), peers) {
661	if (rport->port_state != FC_PORTSTATE_ONLINE)
662	continue;
663
664	if (rport->port_name == wwpn) {
665	spin_unlock_irqrestore(lock: shost->host_lock, flags);
666	return rport;
667	}
668	}
669
670	spin_unlock_irqrestore(lock: shost->host_lock, flags);
671	return NULL;
672	}
673	EXPORT_SYMBOL(fc_find_rport_by_wwpn);
674
675	static void
676	fc_li_stats_update(u16 event_type,
677	struct fc_fpin_stats *stats)
678	{
679	stats->li++;
680	switch (event_type) {
681	case FPIN_LI_UNKNOWN:
682	stats->li_failure_unknown++;
683	break;
684	case FPIN_LI_LINK_FAILURE:
685	stats->li_link_failure_count++;
686	break;
687	case FPIN_LI_LOSS_OF_SYNC:
688	stats->li_loss_of_sync_count++;
689	break;
690	case FPIN_LI_LOSS_OF_SIG:
691	stats->li_loss_of_signals_count++;
692	break;
693	case FPIN_LI_PRIM_SEQ_ERR:
694	stats->li_prim_seq_err_count++;
695	break;
696	case FPIN_LI_INVALID_TX_WD:
697	stats->li_invalid_tx_word_count++;
698	break;
699	case FPIN_LI_INVALID_CRC:
700	stats->li_invalid_crc_count++;
701	break;
702	case FPIN_LI_DEVICE_SPEC:
703	stats->li_device_specific++;
704	break;
705	}
706	}
707
708	static void
709	fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
710	{
711	stats->dn++;
712	switch (reason_code) {
713	case FPIN_DELI_UNKNOWN:
714	stats->dn_unknown++;
715	break;
716	case FPIN_DELI_TIMEOUT:
717	stats->dn_timeout++;
718	break;
719	case FPIN_DELI_UNABLE_TO_ROUTE:
720	stats->dn_unable_to_route++;
721	break;
722	case FPIN_DELI_DEVICE_SPEC:
723	stats->dn_device_specific++;
724	break;
725	}
726	}
727
728	static void
729	fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
730	{
731	stats->cn++;
732	switch (event_type) {
733	case FPIN_CONGN_CLEAR:
734	stats->cn_clear++;
735	break;
736	case FPIN_CONGN_LOST_CREDIT:
737	stats->cn_lost_credit++;
738	break;
739	case FPIN_CONGN_CREDIT_STALL:
740	stats->cn_credit_stall++;
741	break;
742	case FPIN_CONGN_OVERSUBSCRIPTION:
743	stats->cn_oversubscription++;
744	break;
745	case FPIN_CONGN_DEVICE_SPEC:
746	stats->cn_device_specific++;
747	}
748	}
749
750	/*
751	* fc_fpin_li_stats_update - routine to update Link Integrity
752	* event statistics.
753	* @shost: host the FPIN was received on
754	* @tlv: pointer to link integrity descriptor
755	*
756	*/
757	static void
758	fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
759	{
760	u8 i;
761	struct fc_rport *rport = NULL;
762	struct fc_rport *attach_rport = NULL;
763	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
764	struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
765	u16 event_type = be16_to_cpu(li_desc->event_type);
766	u64 wwpn;
767
768	rport = fc_find_rport_by_wwpn(shost,
769	be64_to_cpu(li_desc->attached_wwpn));
770	if (rport &&
771	(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
772	rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
773	attach_rport = rport;
774	fc_li_stats_update(event_type, stats: &attach_rport->fpin_stats);
775	}
776
777	if (be32_to_cpu(li_desc->pname_count) > 0) {
778	for (i = 0;
779	i < be32_to_cpu(li_desc->pname_count);
780	i++) {
781	wwpn = be64_to_cpu(li_desc->pname_list[i]);
782	rport = fc_find_rport_by_wwpn(shost, wwpn);
783	if (rport &&
784	(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
785	rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
786	if (rport == attach_rport)
787	continue;
788	fc_li_stats_update(event_type,
789	stats: &rport->fpin_stats);
790	}
791	}
792	}
793
794	if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
795	fc_li_stats_update(event_type, stats: &fc_host->fpin_stats);
796	}
797
798	/*
799	* fc_fpin_delivery_stats_update - routine to update Delivery Notification
800	* event statistics.
801	* @shost: host the FPIN was received on
802	* @tlv: pointer to delivery descriptor
803	*
804	*/
805	static void
806	fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
807	struct fc_tlv_desc *tlv)
808	{
809	struct fc_rport *rport = NULL;
810	struct fc_rport *attach_rport = NULL;
811	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
812	struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
813	u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
814
815	rport = fc_find_rport_by_wwpn(shost,
816	be64_to_cpu(dn_desc->attached_wwpn));
817	if (rport &&
818	(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
819	rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
820	attach_rport = rport;
821	fc_delivery_stats_update(reason_code,
822	stats: &attach_rport->fpin_stats);
823	}
824
825	if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
826	fc_delivery_stats_update(reason_code, stats: &fc_host->fpin_stats);
827	}
828
829	/*
830	* fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
831	* event statistics.
832	* @shost: host the FPIN was received on
833	* @tlv: pointer to peer congestion descriptor
834	*
835	*/
836	static void
837	fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
838	struct fc_tlv_desc *tlv)
839	{
840	u8 i;
841	struct fc_rport *rport = NULL;
842	struct fc_rport *attach_rport = NULL;
843	struct fc_fn_peer_congn_desc *pc_desc =
844	(struct fc_fn_peer_congn_desc *)tlv;
845	u16 event_type = be16_to_cpu(pc_desc->event_type);
846	u64 wwpn;
847
848	rport = fc_find_rport_by_wwpn(shost,
849	be64_to_cpu(pc_desc->attached_wwpn));
850	if (rport &&
851	(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
852	rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
853	attach_rport = rport;
854	fc_cn_stats_update(event_type, stats: &attach_rport->fpin_stats);
855	}
856
857	if (be32_to_cpu(pc_desc->pname_count) > 0) {
858	for (i = 0;
859	i < be32_to_cpu(pc_desc->pname_count);
860	i++) {
861	wwpn = be64_to_cpu(pc_desc->pname_list[i]);
862	rport = fc_find_rport_by_wwpn(shost, wwpn);
863	if (rport &&
864	(rport->roles & FC_PORT_ROLE_FCP_TARGET ||
865	rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
866	if (rport == attach_rport)
867	continue;
868	fc_cn_stats_update(event_type,
869	stats: &rport->fpin_stats);
870	}
871	}
872	}
873	}
874
875	/*
876	* fc_fpin_congn_stats_update - routine to update Congestion
877	* event statistics.
878	* @shost: host the FPIN was received on
879	* @tlv: pointer to congestion descriptor
880	*
881	*/
882	static void
883	fc_fpin_congn_stats_update(struct Scsi_Host *shost,
884	struct fc_tlv_desc *tlv)
885	{
886	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
887	struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
888
889	fc_cn_stats_update(be16_to_cpu(congn->event_type),
890	stats: &fc_host->fpin_stats);
891	}
892
893	/**
894	* fc_host_fpin_rcv - routine to process a received FPIN.
895	* @shost: host the FPIN was received on
896	* @fpin_len: length of FPIN payload, in bytes
897	* @fpin_buf: pointer to FPIN payload
898	* @event_acknowledge: 1, if LLDD handles this event.
899	* Notes:
900	* This routine assumes no locks are held on entry.
901	*/
902	void
903	fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf,
904	u8 event_acknowledge)
905	{
906	struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
907	struct fc_tlv_desc *tlv;
908	u32 bytes_remain;
909	u32 dtag;
910	enum fc_host_event_code event_code =
911	event_acknowledge ? FCH_EVT_LINK_FPIN_ACK : FCH_EVT_LINK_FPIN;
912
913	/* Update Statistics */
914	tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
915	bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
916	bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
917
918	while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
919	bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
920	dtag = be32_to_cpu(tlv->desc_tag);
921	switch (dtag) {
922	case ELS_DTAG_LNK_INTEGRITY:
923	fc_fpin_li_stats_update(shost, tlv);
924	break;
925	case ELS_DTAG_DELIVERY:
926	fc_fpin_delivery_stats_update(shost, tlv);
927	break;
928	case ELS_DTAG_PEER_CONGEST:
929	fc_fpin_peer_congn_stats_update(shost, tlv);
930	break;
931	case ELS_DTAG_CONGESTION:
932	fc_fpin_congn_stats_update(shost, tlv);
933	}
934
935	bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
936	tlv = fc_tlv_next_desc(desc: tlv);
937	}
938
939	fc_host_post_fc_event(shost, fc_get_event_number(),
940	event_code, fpin_len, fpin_buf, 0);
941	}
942	EXPORT_SYMBOL(fc_host_fpin_rcv);
943
944
945	static __init int fc_transport_init(void)
946	{
947	int error;
948
949	atomic_set(v: &fc_event_seq, i: 0);
950
951	error = transport_class_register(&fc_host_class);
952	if (error)
953	return error;
954	error = transport_class_register(&fc_vport_class);
955	if (error)
956	goto unreg_host_class;
957	error = transport_class_register(&fc_rport_class);
958	if (error)
959	goto unreg_vport_class;
960	error = transport_class_register(&fc_transport_class);
961	if (error)
962	goto unreg_rport_class;
963	return 0;
964
965	unreg_rport_class:
966	transport_class_unregister(&fc_rport_class);
967	unreg_vport_class:
968	transport_class_unregister(&fc_vport_class);
969	unreg_host_class:
970	transport_class_unregister(&fc_host_class);
971	return error;
972	}
973
974	static void __exit fc_transport_exit(void)
975	{
976	transport_class_unregister(&fc_transport_class);
977	transport_class_unregister(&fc_rport_class);
978	transport_class_unregister(&fc_host_class);
979	transport_class_unregister(&fc_vport_class);
980	}
981
982	/*
983	* FC Remote Port Attribute Management
984	*/
985
986	#define fc_rport_show_function(field, format_string, sz, cast) \
987	static ssize_t \
988	show_fc_rport_##field (struct device *dev, \
989	struct device_attribute *attr, char *buf) \
990	{ \
991	struct fc_rport *rport = transport_class_to_rport(dev); \
992	struct Scsi_Host *shost = rport_to_shost(rport); \
993	struct fc_internal *i = to_fc_internal(shost->transportt); \
994	if ((i->f->get_rport_##field) && \
995	!((rport->port_state == FC_PORTSTATE_BLOCKED) || \
996	(rport->port_state == FC_PORTSTATE_DELETED) || \
997	(rport->port_state == FC_PORTSTATE_NOTPRESENT))) \
998	i->f->get_rport_##field(rport); \
999	return snprintf(buf, sz, format_string, cast rport->field); \
1000	}
1001
1002	#define fc_rport_store_function(field) \
1003	static ssize_t \
1004	store_fc_rport_##field(struct device *dev, \
1005	struct device_attribute *attr, \
1006	const char *buf, size_t count) \
1007	{ \
1008	int val; \
1009	struct fc_rport *rport = transport_class_to_rport(dev); \
1010	struct Scsi_Host *shost = rport_to_shost(rport); \
1011	struct fc_internal *i = to_fc_internal(shost->transportt); \
1012	char *cp; \
1013	if ((rport->port_state == FC_PORTSTATE_BLOCKED) || \
1014	(rport->port_state == FC_PORTSTATE_DELETED) || \
1015	(rport->port_state == FC_PORTSTATE_NOTPRESENT)) \
1016	return -EBUSY; \
1017	val = simple_strtoul(buf, &cp, 0); \
1018	if (*cp && (*cp != '\n')) \
1019	return -EINVAL; \
1020	i->f->set_rport_##field(rport, val); \
1021	return count; \
1022	}
1023
1024	#define fc_rport_rd_attr(field, format_string, sz) \
1025	fc_rport_show_function(field, format_string, sz, ) \
1026	static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1027	show_fc_rport_##field, NULL)
1028
1029	#define fc_rport_rd_attr_cast(field, format_string, sz, cast) \
1030	fc_rport_show_function(field, format_string, sz, (cast)) \
1031	static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1032	show_fc_rport_##field, NULL)
1033
1034	#define fc_rport_rw_attr(field, format_string, sz) \
1035	fc_rport_show_function(field, format_string, sz, ) \
1036	fc_rport_store_function(field) \
1037	static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR, \
1038	show_fc_rport_##field, \
1039	store_fc_rport_##field)
1040
1041
1042	#define fc_private_rport_show_function(field, format_string, sz, cast) \
1043	static ssize_t \
1044	show_fc_rport_##field (struct device *dev, \
1045	struct device_attribute *attr, char *buf) \
1046	{ \
1047	struct fc_rport *rport = transport_class_to_rport(dev); \
1048	return snprintf(buf, sz, format_string, cast rport->field); \
1049	}
1050
1051	#define fc_private_rport_rd_attr(field, format_string, sz) \
1052	fc_private_rport_show_function(field, format_string, sz, ) \
1053	static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1054	show_fc_rport_##field, NULL)
1055
1056	#define fc_private_rport_rd_attr_cast(field, format_string, sz, cast) \
1057	fc_private_rport_show_function(field, format_string, sz, (cast)) \
1058	static FC_DEVICE_ATTR(rport, field, S_IRUGO, \
1059	show_fc_rport_##field, NULL)
1060
1061
1062	#define fc_private_rport_rd_enum_attr(title, maxlen) \
1063	static ssize_t \
1064	show_fc_rport_##title (struct device *dev, \
1065	struct device_attribute *attr, char *buf) \
1066	{ \
1067	struct fc_rport *rport = transport_class_to_rport(dev); \
1068	const char *name; \
1069	name = get_fc_##title##_name(rport->title); \
1070	if (!name) \
1071	return -EINVAL; \
1072	return snprintf(buf, maxlen, "%s\n", name); \
1073	} \
1074	static FC_DEVICE_ATTR(rport, title, S_IRUGO, \
1075	show_fc_rport_##title, NULL)
1076
1077
1078	#define SETUP_RPORT_ATTRIBUTE_RD(field) \
1079	i->private_rport_attrs[count] = device_attr_rport_##field; \
1080	i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1081	i->private_rport_attrs[count].store = NULL; \
1082	i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1083	if (i->f->show_rport_##field) \
1084	count++
1085
1086	#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field) \
1087	i->private_rport_attrs[count] = device_attr_rport_##field; \
1088	i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1089	i->private_rport_attrs[count].store = NULL; \
1090	i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1091	count++
1092
1093	#define SETUP_RPORT_ATTRIBUTE_RW(field) \
1094	i->private_rport_attrs[count] = device_attr_rport_##field; \
1095	if (!i->f->set_rport_##field) { \
1096	i->private_rport_attrs[count].attr.mode = S_IRUGO; \
1097	i->private_rport_attrs[count].store = NULL; \
1098	} \
1099	i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1100	if (i->f->show_rport_##field) \
1101	count++
1102
1103	#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field) \
1104	{ \
1105	i->private_rport_attrs[count] = device_attr_rport_##field; \
1106	i->rport_attrs[count] = &i->private_rport_attrs[count]; \
1107	count++; \
1108	}
1109
1110
1111	/* The FC Transport Remote Port Attributes: */
1112
1113	/* Fixed Remote Port Attributes */
1114
1115	fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
1116
1117	static ssize_t
1118	show_fc_rport_supported_classes (struct device *dev,
1119	struct device_attribute *attr, char *buf)
1120	{
1121	struct fc_rport *rport = transport_class_to_rport(dev);
1122	if (rport->supported_classes == FC_COS_UNSPECIFIED)
1123	return snprintf(buf, size: 20, fmt: "unspecified\n");
1124	return get_fc_cos_names(table_key: rport->supported_classes, buf);
1125	}
1126	static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
1127	show_fc_rport_supported_classes, NULL);
1128
1129	/* Dynamic Remote Port Attributes */
1130
1131	/*
1132	* dev_loss_tmo attribute
1133	*/
1134	static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
1135	{
1136	char *cp;
1137
1138	*val = simple_strtoul(buf, &cp, 0);
1139	if (*cp && (*cp != '\n'))
1140	return -EINVAL;
1141	/*
1142	* Check for overflow; dev_loss_tmo is u32
1143	*/
1144	if (*val > UINT_MAX)
1145	return -EINVAL;
1146
1147	return 0;
1148	}
1149
1150	static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
1151	unsigned long val)
1152	{
1153	struct Scsi_Host *shost = rport_to_shost(rport);
1154	struct fc_internal *i = to_fc_internal(shost->transportt);
1155
1156	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1157	(rport->port_state == FC_PORTSTATE_DELETED) ||
1158	(rport->port_state == FC_PORTSTATE_NOTPRESENT))
1159	return -EBUSY;
1160	/*
1161	* Check for overflow; dev_loss_tmo is u32
1162	*/
1163	if (val > UINT_MAX)
1164	return -EINVAL;
1165
1166	/*
1167	* If fast_io_fail is off we have to cap
1168	* dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
1169	*/
1170	if (rport->fast_io_fail_tmo == -1 &&
1171	val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1172	return -EINVAL;
1173
1174	i->f->set_rport_dev_loss_tmo(rport, val);
1175	return 0;
1176	}
1177
1178	fc_rport_show_function(dev_loss_tmo, "%u\n", 20, )
1179	static ssize_t
1180	store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
1181	const char *buf, size_t count)
1182	{
1183	struct fc_rport *rport = transport_class_to_rport(dev);
1184	unsigned long val;
1185	int rc;
1186
1187	rc = fc_str_to_dev_loss(buf, val: &val);
1188	if (rc)
1189	return rc;
1190
1191	rc = fc_rport_set_dev_loss_tmo(rport, val);
1192	if (rc)
1193	return rc;
1194	return count;
1195	}
1196	static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
1197	show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
1198
1199
1200	/* Private Remote Port Attributes */
1201
1202	fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1203	fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1204	fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
1205
1206	static ssize_t
1207	show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
1208	char *buf)
1209	{
1210	struct fc_rport *rport = transport_class_to_rport(dev);
1211
1212	/* identify any roles that are port_id specific */
1213	if ((rport->port_id != -1) &&
1214	(rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
1215	FC_WELLKNOWN_PORTID_MASK) {
1216	switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
1217	case FC_FPORT_PORTID:
1218	return snprintf(buf, size: 30, fmt: "Fabric Port\n");
1219	case FC_FABCTLR_PORTID:
1220	return snprintf(buf, size: 30, fmt: "Fabric Controller\n");
1221	case FC_DIRSRVR_PORTID:
1222	return snprintf(buf, size: 30, fmt: "Directory Server\n");
1223	case FC_TIMESRVR_PORTID:
1224	return snprintf(buf, size: 30, fmt: "Time Server\n");
1225	case FC_MGMTSRVR_PORTID:
1226	return snprintf(buf, size: 30, fmt: "Management Server\n");
1227	default:
1228	return snprintf(buf, size: 30, fmt: "Unknown Fabric Entity\n");
1229	}
1230	} else {
1231	if (rport->roles == FC_PORT_ROLE_UNKNOWN)
1232	return snprintf(buf, size: 20, fmt: "unknown\n");
1233	return get_fc_port_roles_names(table_key: rport->roles, buf);
1234	}
1235	}
1236	static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
1237	show_fc_rport_roles, NULL);
1238
1239	static ssize_t fc_rport_set_marginal_state(struct device *dev,
1240	struct device_attribute *attr,
1241	const char *buf, size_t count)
1242	{
1243	struct fc_rport *rport = transport_class_to_rport(dev);
1244	enum fc_port_state port_state;
1245	int ret = 0;
1246
1247	ret = get_fc_port_state_match(table_key: buf, value: &port_state);
1248	if (ret)
1249	return -EINVAL;
1250	if (port_state == FC_PORTSTATE_MARGINAL) {
1251	/*
1252	* Change the state to Marginal only if the
1253	* current rport state is Online
1254	* Allow only Online->Marginal
1255	*/
1256	if (rport->port_state == FC_PORTSTATE_ONLINE)
1257	rport->port_state = port_state;
1258	else
1259	return -EINVAL;
1260	} else if (port_state == FC_PORTSTATE_ONLINE) {
1261	/*
1262	* Change the state to Online only if the
1263	* current rport state is Marginal
1264	* Allow only Marginal->Online
1265	*/
1266	if (rport->port_state == FC_PORTSTATE_MARGINAL)
1267	rport->port_state = port_state;
1268	else
1269	return -EINVAL;
1270	} else
1271	return -EINVAL;
1272	return count;
1273	}
1274
1275	static ssize_t
1276	show_fc_rport_port_state(struct device *dev,
1277	struct device_attribute *attr, char *buf)
1278	{
1279	const char *name;
1280	struct fc_rport *rport = transport_class_to_rport(dev);
1281
1282	name = get_fc_port_state_name(table_key: rport->port_state);
1283	if (!name)
1284	return -EINVAL;
1285
1286	return snprintf(buf, size: 20, fmt: "%s\n", name);
1287	}
1288
1289	static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
1290	show_fc_rport_port_state, fc_rport_set_marginal_state);
1291
1292	fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
1293
1294	/*
1295	* fast_io_fail_tmo attribute
1296	*/
1297	static ssize_t
1298	show_fc_rport_fast_io_fail_tmo (struct device *dev,
1299	struct device_attribute *attr, char *buf)
1300	{
1301	struct fc_rport *rport = transport_class_to_rport(dev);
1302
1303	if (rport->fast_io_fail_tmo == -1)
1304	return snprintf(buf, size: 5, fmt: "off\n");
1305	return snprintf(buf, size: 20, fmt: "%d\n", rport->fast_io_fail_tmo);
1306	}
1307
1308	static ssize_t
1309	store_fc_rport_fast_io_fail_tmo(struct device *dev,
1310	struct device_attribute *attr, const char *buf,
1311	size_t count)
1312	{
1313	int val;
1314	char *cp;
1315	struct fc_rport *rport = transport_class_to_rport(dev);
1316
1317	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1318	(rport->port_state == FC_PORTSTATE_DELETED) ||
1319	(rport->port_state == FC_PORTSTATE_NOTPRESENT))
1320	return -EBUSY;
1321	if (strncmp(buf, "off", 3) == 0)
1322	rport->fast_io_fail_tmo = -1;
1323	else {
1324	val = simple_strtoul(buf, &cp, 0);
1325	if ((*cp && (*cp != '\n')) || (val < 0))
1326	return -EINVAL;
1327	/*
1328	* Cap fast_io_fail by dev_loss_tmo or
1329	* SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
1330	*/
1331	if ((val >= rport->dev_loss_tmo) ||
1332	(val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1333	return -EINVAL;
1334
1335	rport->fast_io_fail_tmo = val;
1336	}
1337	return count;
1338	}
1339	static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1340	show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1341
1342	#define fc_rport_fpin_statistic(name) \
1343	static ssize_t fc_rport_fpinstat_##name(struct device *cd, \
1344	struct device_attribute *attr, \
1345	char *buf) \
1346	{ \
1347	struct fc_rport *rport = transport_class_to_rport(cd); \
1348	\
1349	return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name); \
1350	} \
1351	static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
1352
1353	fc_rport_fpin_statistic(dn);
1354	fc_rport_fpin_statistic(dn_unknown);
1355	fc_rport_fpin_statistic(dn_timeout);
1356	fc_rport_fpin_statistic(dn_unable_to_route);
1357	fc_rport_fpin_statistic(dn_device_specific);
1358	fc_rport_fpin_statistic(cn);
1359	fc_rport_fpin_statistic(cn_clear);
1360	fc_rport_fpin_statistic(cn_lost_credit);
1361	fc_rport_fpin_statistic(cn_credit_stall);
1362	fc_rport_fpin_statistic(cn_oversubscription);
1363	fc_rport_fpin_statistic(cn_device_specific);
1364	fc_rport_fpin_statistic(li);
1365	fc_rport_fpin_statistic(li_failure_unknown);
1366	fc_rport_fpin_statistic(li_link_failure_count);
1367	fc_rport_fpin_statistic(li_loss_of_sync_count);
1368	fc_rport_fpin_statistic(li_loss_of_signals_count);
1369	fc_rport_fpin_statistic(li_prim_seq_err_count);
1370	fc_rport_fpin_statistic(li_invalid_tx_word_count);
1371	fc_rport_fpin_statistic(li_invalid_crc_count);
1372	fc_rport_fpin_statistic(li_device_specific);
1373
1374	static struct attribute *fc_rport_statistics_attrs[] = {
1375	&device_attr_rport_fpin_dn.attr,
1376	&device_attr_rport_fpin_dn_unknown.attr,
1377	&device_attr_rport_fpin_dn_timeout.attr,
1378	&device_attr_rport_fpin_dn_unable_to_route.attr,
1379	&device_attr_rport_fpin_dn_device_specific.attr,
1380	&device_attr_rport_fpin_li.attr,
1381	&device_attr_rport_fpin_li_failure_unknown.attr,
1382	&device_attr_rport_fpin_li_link_failure_count.attr,
1383	&device_attr_rport_fpin_li_loss_of_sync_count.attr,
1384	&device_attr_rport_fpin_li_loss_of_signals_count.attr,
1385	&device_attr_rport_fpin_li_prim_seq_err_count.attr,
1386	&device_attr_rport_fpin_li_invalid_tx_word_count.attr,
1387	&device_attr_rport_fpin_li_invalid_crc_count.attr,
1388	&device_attr_rport_fpin_li_device_specific.attr,
1389	&device_attr_rport_fpin_cn.attr,
1390	&device_attr_rport_fpin_cn_clear.attr,
1391	&device_attr_rport_fpin_cn_lost_credit.attr,
1392	&device_attr_rport_fpin_cn_credit_stall.attr,
1393	&device_attr_rport_fpin_cn_oversubscription.attr,
1394	&device_attr_rport_fpin_cn_device_specific.attr,
1395	NULL
1396	};
1397
1398	static struct attribute_group fc_rport_statistics_group = {
1399	.name = "statistics",
1400	.attrs = fc_rport_statistics_attrs,
1401	};
1402
1403
1404	/*
1405	* FC SCSI Target Attribute Management
1406	*/
1407
1408	/*
1409	* Note: in the target show function we recognize when the remote
1410	* port is in the hierarchy and do not allow the driver to get
1411	* involved in sysfs functions. The driver only gets involved if
1412	* it's the "old" style that doesn't use rports.
1413	*/
1414	#define fc_starget_show_function(field, format_string, sz, cast) \
1415	static ssize_t \
1416	show_fc_starget_##field (struct device *dev, \
1417	struct device_attribute *attr, char *buf) \
1418	{ \
1419	struct scsi_target *starget = transport_class_to_starget(dev); \
1420	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \
1421	struct fc_internal *i = to_fc_internal(shost->transportt); \
1422	struct fc_rport *rport = starget_to_rport(starget); \
1423	if (rport) \
1424	fc_starget_##field(starget) = rport->field; \
1425	else if (i->f->get_starget_##field) \
1426	i->f->get_starget_##field(starget); \
1427	return snprintf(buf, sz, format_string, \
1428	cast fc_starget_##field(starget)); \
1429	}
1430
1431	#define fc_starget_rd_attr(field, format_string, sz) \
1432	fc_starget_show_function(field, format_string, sz, ) \
1433	static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1434	show_fc_starget_##field, NULL)
1435
1436	#define fc_starget_rd_attr_cast(field, format_string, sz, cast) \
1437	fc_starget_show_function(field, format_string, sz, (cast)) \
1438	static FC_DEVICE_ATTR(starget, field, S_IRUGO, \
1439	show_fc_starget_##field, NULL)
1440
1441	#define SETUP_STARGET_ATTRIBUTE_RD(field) \
1442	i->private_starget_attrs[count] = device_attr_starget_##field; \
1443	i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1444	i->private_starget_attrs[count].store = NULL; \
1445	i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1446	if (i->f->show_starget_##field) \
1447	count++
1448
1449	#define SETUP_STARGET_ATTRIBUTE_RW(field) \
1450	i->private_starget_attrs[count] = device_attr_starget_##field; \
1451	if (!i->f->set_starget_##field) { \
1452	i->private_starget_attrs[count].attr.mode = S_IRUGO; \
1453	i->private_starget_attrs[count].store = NULL; \
1454	} \
1455	i->starget_attrs[count] = &i->private_starget_attrs[count]; \
1456	if (i->f->show_starget_##field) \
1457	count++
1458
1459	/* The FC Transport SCSI Target Attributes: */
1460	fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1461	fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1462	fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1463
1464
1465	/*
1466	* FC Virtual Port Attribute Management
1467	*/
1468
1469	#define fc_vport_show_function(field, format_string, sz, cast) \
1470	static ssize_t \
1471	show_fc_vport_##field (struct device *dev, \
1472	struct device_attribute *attr, char *buf) \
1473	{ \
1474	struct fc_vport *vport = transport_class_to_vport(dev); \
1475	struct Scsi_Host *shost = vport_to_shost(vport); \
1476	struct fc_internal *i = to_fc_internal(shost->transportt); \
1477	if ((i->f->get_vport_##field) && \
1478	!(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))) \
1479	i->f->get_vport_##field(vport); \
1480	return snprintf(buf, sz, format_string, cast vport->field); \
1481	}
1482
1483	#define fc_vport_store_function(field) \
1484	static ssize_t \
1485	store_fc_vport_##field(struct device *dev, \
1486	struct device_attribute *attr, \
1487	const char *buf, size_t count) \
1488	{ \
1489	int val; \
1490	struct fc_vport *vport = transport_class_to_vport(dev); \
1491	struct Scsi_Host *shost = vport_to_shost(vport); \
1492	struct fc_internal *i = to_fc_internal(shost->transportt); \
1493	char *cp; \
1494	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1495	return -EBUSY; \
1496	val = simple_strtoul(buf, &cp, 0); \
1497	if (*cp && (*cp != '\n')) \
1498	return -EINVAL; \
1499	i->f->set_vport_##field(vport, val); \
1500	return count; \
1501	}
1502
1503	#define fc_vport_store_str_function(field, slen) \
1504	static ssize_t \
1505	store_fc_vport_##field(struct device *dev, \
1506	struct device_attribute *attr, \
1507	const char *buf, size_t count) \
1508	{ \
1509	struct fc_vport *vport = transport_class_to_vport(dev); \
1510	struct Scsi_Host *shost = vport_to_shost(vport); \
1511	struct fc_internal *i = to_fc_internal(shost->transportt); \
1512	unsigned int cnt=count; \
1513	\
1514	/* count may include a LF at end of string */ \
1515	if (buf[cnt-1] == '\n') \
1516	cnt--; \
1517	if (cnt > ((slen) - 1)) \
1518	return -EINVAL; \
1519	memcpy(vport->field, buf, cnt); \
1520	i->f->set_vport_##field(vport); \
1521	return count; \
1522	}
1523
1524	#define fc_vport_rd_attr(field, format_string, sz) \
1525	fc_vport_show_function(field, format_string, sz, ) \
1526	static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1527	show_fc_vport_##field, NULL)
1528
1529	#define fc_vport_rd_attr_cast(field, format_string, sz, cast) \
1530	fc_vport_show_function(field, format_string, sz, (cast)) \
1531	static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1532	show_fc_vport_##field, NULL)
1533
1534	#define fc_vport_rw_attr(field, format_string, sz) \
1535	fc_vport_show_function(field, format_string, sz, ) \
1536	fc_vport_store_function(field) \
1537	static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1538	show_fc_vport_##field, \
1539	store_fc_vport_##field)
1540
1541	#define fc_private_vport_show_function(field, format_string, sz, cast) \
1542	static ssize_t \
1543	show_fc_vport_##field (struct device *dev, \
1544	struct device_attribute *attr, char *buf) \
1545	{ \
1546	struct fc_vport *vport = transport_class_to_vport(dev); \
1547	return snprintf(buf, sz, format_string, cast vport->field); \
1548	}
1549
1550	#define fc_private_vport_store_u32_function(field) \
1551	static ssize_t \
1552	store_fc_vport_##field(struct device *dev, \
1553	struct device_attribute *attr, \
1554	const char *buf, size_t count) \
1555	{ \
1556	u32 val; \
1557	struct fc_vport *vport = transport_class_to_vport(dev); \
1558	char *cp; \
1559	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) \
1560	return -EBUSY; \
1561	val = simple_strtoul(buf, &cp, 0); \
1562	if (*cp && (*cp != '\n')) \
1563	return -EINVAL; \
1564	vport->field = val; \
1565	return count; \
1566	}
1567
1568
1569	#define fc_private_vport_rd_attr(field, format_string, sz) \
1570	fc_private_vport_show_function(field, format_string, sz, ) \
1571	static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1572	show_fc_vport_##field, NULL)
1573
1574	#define fc_private_vport_rd_attr_cast(field, format_string, sz, cast) \
1575	fc_private_vport_show_function(field, format_string, sz, (cast)) \
1576	static FC_DEVICE_ATTR(vport, field, S_IRUGO, \
1577	show_fc_vport_##field, NULL)
1578
1579	#define fc_private_vport_rw_u32_attr(field, format_string, sz) \
1580	fc_private_vport_show_function(field, format_string, sz, ) \
1581	fc_private_vport_store_u32_function(field) \
1582	static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR, \
1583	show_fc_vport_##field, \
1584	store_fc_vport_##field)
1585
1586
1587	#define fc_private_vport_rd_enum_attr(title, maxlen) \
1588	static ssize_t \
1589	show_fc_vport_##title (struct device *dev, \
1590	struct device_attribute *attr, \
1591	char *buf) \
1592	{ \
1593	struct fc_vport *vport = transport_class_to_vport(dev); \
1594	const char *name; \
1595	name = get_fc_##title##_name(vport->title); \
1596	if (!name) \
1597	return -EINVAL; \
1598	return snprintf(buf, maxlen, "%s\n", name); \
1599	} \
1600	static FC_DEVICE_ATTR(vport, title, S_IRUGO, \
1601	show_fc_vport_##title, NULL)
1602
1603
1604	#define SETUP_VPORT_ATTRIBUTE_RD(field) \
1605	i->private_vport_attrs[count] = device_attr_vport_##field; \
1606	i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1607	i->private_vport_attrs[count].store = NULL; \
1608	i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1609	if (i->f->get_##field) \
1610	count++
1611	/* NOTE: Above MACRO differs: checks function not show bit */
1612
1613	#define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field) \
1614	i->private_vport_attrs[count] = device_attr_vport_##field; \
1615	i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1616	i->private_vport_attrs[count].store = NULL; \
1617	i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1618	count++
1619
1620	#define SETUP_VPORT_ATTRIBUTE_WR(field) \
1621	i->private_vport_attrs[count] = device_attr_vport_##field; \
1622	i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1623	if (i->f->field) \
1624	count++
1625	/* NOTE: Above MACRO differs: checks function */
1626
1627	#define SETUP_VPORT_ATTRIBUTE_RW(field) \
1628	i->private_vport_attrs[count] = device_attr_vport_##field; \
1629	if (!i->f->set_vport_##field) { \
1630	i->private_vport_attrs[count].attr.mode = S_IRUGO; \
1631	i->private_vport_attrs[count].store = NULL; \
1632	} \
1633	i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1634	count++
1635	/* NOTE: Above MACRO differs: does not check show bit */
1636
1637	#define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field) \
1638	{ \
1639	i->private_vport_attrs[count] = device_attr_vport_##field; \
1640	i->vport_attrs[count] = &i->private_vport_attrs[count]; \
1641	count++; \
1642	}
1643
1644
1645	/* The FC Transport Virtual Port Attributes: */
1646
1647	/* Fixed Virtual Port Attributes */
1648
1649	/* Dynamic Virtual Port Attributes */
1650
1651	/* Private Virtual Port Attributes */
1652
1653	fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1654	fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1655	fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1656	fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1657
1658	static ssize_t
1659	show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1660	char *buf)
1661	{
1662	struct fc_vport *vport = transport_class_to_vport(dev);
1663
1664	if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1665	return snprintf(buf, size: 20, fmt: "unknown\n");
1666	return get_fc_port_roles_names(table_key: vport->roles, buf);
1667	}
1668	static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1669
1670	fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1671
1672	fc_private_vport_show_function(symbolic_name, "%s\n",
1673	FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1674	fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1675	static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1676	show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1677
1678	static ssize_t
1679	store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1680	const char *buf, size_t count)
1681	{
1682	struct fc_vport *vport = transport_class_to_vport(dev);
1683	struct Scsi_Host *shost = vport_to_shost(vport);
1684	unsigned long flags;
1685
1686	spin_lock_irqsave(shost->host_lock, flags);
1687	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1688	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1689	return -EBUSY;
1690	}
1691	vport->flags |= FC_VPORT_DELETING;
1692	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1693
1694	fc_queue_work(shost, &vport->vport_delete_work);
1695	return count;
1696	}
1697	static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1698	NULL, store_fc_vport_delete);
1699
1700
1701	/*
1702	* Enable/Disable vport
1703	* Write "1" to disable, write "0" to enable
1704	*/
1705	static ssize_t
1706	store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1707	const char *buf,
1708	size_t count)
1709	{
1710	struct fc_vport *vport = transport_class_to_vport(dev);
1711	struct Scsi_Host *shost = vport_to_shost(vport);
1712	struct fc_internal *i = to_fc_internal(shost->transportt);
1713	int stat;
1714
1715	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1716	return -EBUSY;
1717
1718	if (*buf == '0') {
1719	if (vport->vport_state != FC_VPORT_DISABLED)
1720	return -EALREADY;
1721	} else if (*buf == '1') {
1722	if (vport->vport_state == FC_VPORT_DISABLED)
1723	return -EALREADY;
1724	} else
1725	return -EINVAL;
1726
1727	stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1728	return stat ? stat : count;
1729	}
1730	static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1731	NULL, store_fc_vport_disable);
1732
1733
1734	/*
1735	* Host Attribute Management
1736	*/
1737
1738	#define fc_host_show_function(field, format_string, sz, cast) \
1739	static ssize_t \
1740	show_fc_host_##field (struct device *dev, \
1741	struct device_attribute *attr, char *buf) \
1742	{ \
1743	struct Scsi_Host *shost = transport_class_to_shost(dev); \
1744	struct fc_internal *i = to_fc_internal(shost->transportt); \
1745	if (i->f->get_host_##field) \
1746	i->f->get_host_##field(shost); \
1747	return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1748	}
1749
1750	#define fc_host_store_function(field) \
1751	static ssize_t \
1752	store_fc_host_##field(struct device *dev, \
1753	struct device_attribute *attr, \
1754	const char *buf, size_t count) \
1755	{ \
1756	int val; \
1757	struct Scsi_Host *shost = transport_class_to_shost(dev); \
1758	struct fc_internal *i = to_fc_internal(shost->transportt); \
1759	char *cp; \
1760	\
1761	val = simple_strtoul(buf, &cp, 0); \
1762	if (*cp && (*cp != '\n')) \
1763	return -EINVAL; \
1764	i->f->set_host_##field(shost, val); \
1765	return count; \
1766	}
1767
1768	#define fc_host_store_str_function(field, slen) \
1769	static ssize_t \
1770	store_fc_host_##field(struct device *dev, \
1771	struct device_attribute *attr, \
1772	const char *buf, size_t count) \
1773	{ \
1774	struct Scsi_Host *shost = transport_class_to_shost(dev); \
1775	struct fc_internal *i = to_fc_internal(shost->transportt); \
1776	unsigned int cnt=count; \
1777	\
1778	/* count may include a LF at end of string */ \
1779	if (buf[cnt-1] == '\n') \
1780	cnt--; \
1781	if (cnt > ((slen) - 1)) \
1782	return -EINVAL; \
1783	memcpy(fc_host_##field(shost), buf, cnt); \
1784	i->f->set_host_##field(shost); \
1785	return count; \
1786	}
1787
1788	#define fc_host_rd_attr(field, format_string, sz) \
1789	fc_host_show_function(field, format_string, sz, ) \
1790	static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1791	show_fc_host_##field, NULL)
1792
1793	#define fc_host_rd_attr_cast(field, format_string, sz, cast) \
1794	fc_host_show_function(field, format_string, sz, (cast)) \
1795	static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1796	show_fc_host_##field, NULL)
1797
1798	#define fc_host_rw_attr(field, format_string, sz) \
1799	fc_host_show_function(field, format_string, sz, ) \
1800	fc_host_store_function(field) \
1801	static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR, \
1802	show_fc_host_##field, \
1803	store_fc_host_##field)
1804
1805	#define fc_host_rd_enum_attr(title, maxlen) \
1806	static ssize_t \
1807	show_fc_host_##title (struct device *dev, \
1808	struct device_attribute *attr, char *buf) \
1809	{ \
1810	struct Scsi_Host *shost = transport_class_to_shost(dev); \
1811	struct fc_internal *i = to_fc_internal(shost->transportt); \
1812	const char *name; \
1813	if (i->f->get_host_##title) \
1814	i->f->get_host_##title(shost); \
1815	name = get_fc_##title##_name(fc_host_##title(shost)); \
1816	if (!name) \
1817	return -EINVAL; \
1818	return snprintf(buf, maxlen, "%s\n", name); \
1819	} \
1820	static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1821
1822	#define SETUP_HOST_ATTRIBUTE_RD(field) \
1823	i->private_host_attrs[count] = device_attr_host_##field; \
1824	i->private_host_attrs[count].attr.mode = S_IRUGO; \
1825	i->private_host_attrs[count].store = NULL; \
1826	i->host_attrs[count] = &i->private_host_attrs[count]; \
1827	if (i->f->show_host_##field) \
1828	count++
1829
1830	#define SETUP_HOST_ATTRIBUTE_RD_NS(field) \
1831	i->private_host_attrs[count] = device_attr_host_##field; \
1832	i->private_host_attrs[count].attr.mode = S_IRUGO; \
1833	i->private_host_attrs[count].store = NULL; \
1834	i->host_attrs[count] = &i->private_host_attrs[count]; \
1835	count++
1836
1837	#define SETUP_HOST_ATTRIBUTE_RW(field) \
1838	i->private_host_attrs[count] = device_attr_host_##field; \
1839	if (!i->f->set_host_##field) { \
1840	i->private_host_attrs[count].attr.mode = S_IRUGO; \
1841	i->private_host_attrs[count].store = NULL; \
1842	} \
1843	i->host_attrs[count] = &i->private_host_attrs[count]; \
1844	if (i->f->show_host_##field) \
1845	count++
1846
1847
1848	#define fc_private_host_show_function(field, format_string, sz, cast) \
1849	static ssize_t \
1850	show_fc_host_##field (struct device *dev, \
1851	struct device_attribute *attr, char *buf) \
1852	{ \
1853	struct Scsi_Host *shost = transport_class_to_shost(dev); \
1854	return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1855	}
1856
1857	#define fc_private_host_rd_attr(field, format_string, sz) \
1858	fc_private_host_show_function(field, format_string, sz, ) \
1859	static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1860	show_fc_host_##field, NULL)
1861
1862	#define fc_private_host_rd_attr_cast(field, format_string, sz, cast) \
1863	fc_private_host_show_function(field, format_string, sz, (cast)) \
1864	static FC_DEVICE_ATTR(host, field, S_IRUGO, \
1865	show_fc_host_##field, NULL)
1866
1867	#define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field) \
1868	i->private_host_attrs[count] = device_attr_host_##field; \
1869	i->private_host_attrs[count].attr.mode = S_IRUGO; \
1870	i->private_host_attrs[count].store = NULL; \
1871	i->host_attrs[count] = &i->private_host_attrs[count]; \
1872	count++
1873
1874	#define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field) \
1875	{ \
1876	i->private_host_attrs[count] = device_attr_host_##field; \
1877	i->host_attrs[count] = &i->private_host_attrs[count]; \
1878	count++; \
1879	}
1880
1881
1882	/* Fixed Host Attributes */
1883
1884	static ssize_t
1885	show_fc_host_supported_classes (struct device *dev,
1886	struct device_attribute *attr, char *buf)
1887	{
1888	struct Scsi_Host *shost = transport_class_to_shost(dev);
1889
1890	if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1891	return snprintf(buf, size: 20, fmt: "unspecified\n");
1892
1893	return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1894	}
1895	static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1896	show_fc_host_supported_classes, NULL);
1897
1898	static ssize_t
1899	show_fc_host_supported_fc4s (struct device *dev,
1900	struct device_attribute *attr, char *buf)
1901	{
1902	struct Scsi_Host *shost = transport_class_to_shost(dev);
1903	return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1904	}
1905	static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1906	show_fc_host_supported_fc4s, NULL);
1907
1908	static ssize_t
1909	show_fc_host_supported_speeds (struct device *dev,
1910	struct device_attribute *attr, char *buf)
1911	{
1912	struct Scsi_Host *shost = transport_class_to_shost(dev);
1913
1914	if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1915	return snprintf(buf, size: 20, fmt: "unknown\n");
1916
1917	return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1918	}
1919	static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1920	show_fc_host_supported_speeds, NULL);
1921
1922
1923	fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1924	fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1925	fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1926	unsigned long long);
1927	fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1928	fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1929	fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1930	fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1931	fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1932	fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1933	fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1934	fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1935	fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1936	fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1937
1938
1939	/* Dynamic Host Attributes */
1940
1941	static ssize_t
1942	show_fc_host_active_fc4s (struct device *dev,
1943	struct device_attribute *attr, char *buf)
1944	{
1945	struct Scsi_Host *shost = transport_class_to_shost(dev);
1946	struct fc_internal *i = to_fc_internal(shost->transportt);
1947
1948	if (i->f->get_host_active_fc4s)
1949	i->f->get_host_active_fc4s(shost);
1950
1951	return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1952	}
1953	static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1954	show_fc_host_active_fc4s, NULL);
1955
1956	static ssize_t
1957	show_fc_host_speed (struct device *dev,
1958	struct device_attribute *attr, char *buf)
1959	{
1960	struct Scsi_Host *shost = transport_class_to_shost(dev);
1961	struct fc_internal *i = to_fc_internal(shost->transportt);
1962
1963	if (i->f->get_host_speed)
1964	i->f->get_host_speed(shost);
1965
1966	if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1967	return snprintf(buf, size: 20, fmt: "unknown\n");
1968
1969	return get_fc_port_speed_names(fc_host_speed(shost), buf);
1970	}
1971	static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1972	show_fc_host_speed, NULL);
1973
1974
1975	fc_host_rd_attr(port_id, "0x%06x\n", 20);
1976	fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1977	fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1978	fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1979	fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1980
1981	fc_private_host_show_function(system_hostname, "%s\n",
1982	FC_SYMBOLIC_NAME_SIZE + 1, )
1983	fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1984	static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1985	show_fc_host_system_hostname, store_fc_host_system_hostname);
1986
1987
1988	/* Private Host Attributes */
1989
1990	static ssize_t
1991	show_fc_private_host_tgtid_bind_type(struct device *dev,
1992	struct device_attribute *attr, char *buf)
1993	{
1994	struct Scsi_Host *shost = transport_class_to_shost(dev);
1995	const char *name;
1996
1997	name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1998	if (!name)
1999	return -EINVAL;
2000	return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, fmt: "%s\n", name);
2001	}
2002
2003	#define get_list_head_entry(pos, head, member) \
2004	pos = list_entry((head)->next, typeof(*pos), member)
2005
2006	static ssize_t
2007	store_fc_private_host_tgtid_bind_type(struct device *dev,
2008	struct device_attribute *attr, const char *buf, size_t count)
2009	{
2010	struct Scsi_Host *shost = transport_class_to_shost(dev);
2011	struct fc_rport *rport;
2012	enum fc_tgtid_binding_type val;
2013	unsigned long flags;
2014
2015	if (get_fc_tgtid_bind_type_match(table_key: buf, value: &val))
2016	return -EINVAL;
2017
2018	/* if changing bind type, purge all unused consistent bindings */
2019	if (val != fc_host_tgtid_bind_type(shost)) {
2020	spin_lock_irqsave(shost->host_lock, flags);
2021	while (!list_empty(head: &fc_host_rport_bindings(shost))) {
2022	get_list_head_entry(rport,
2023	&fc_host_rport_bindings(shost), peers);
2024	list_del(entry: &rport->peers);
2025	rport->port_state = FC_PORTSTATE_DELETED;
2026	fc_queue_work(shost, &rport->rport_delete_work);
2027	}
2028	spin_unlock_irqrestore(lock: shost->host_lock, flags);
2029	}
2030
2031	fc_host_tgtid_bind_type(shost) = val;
2032	return count;
2033	}
2034
2035	static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
2036	show_fc_private_host_tgtid_bind_type,
2037	store_fc_private_host_tgtid_bind_type);
2038
2039	static ssize_t
2040	store_fc_private_host_issue_lip(struct device *dev,
2041	struct device_attribute *attr, const char *buf, size_t count)
2042	{
2043	struct Scsi_Host *shost = transport_class_to_shost(dev);
2044	struct fc_internal *i = to_fc_internal(shost->transportt);
2045	int ret;
2046
2047	/* ignore any data value written to the attribute */
2048	if (i->f->issue_fc_host_lip) {
2049	ret = i->f->issue_fc_host_lip(shost);
2050	return ret ? ret: count;
2051	}
2052
2053	return -ENOENT;
2054	}
2055
2056	static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
2057	store_fc_private_host_issue_lip);
2058
2059	static ssize_t
2060	store_fc_private_host_dev_loss_tmo(struct device *dev,
2061	struct device_attribute *attr,
2062	const char *buf, size_t count)
2063	{
2064	struct Scsi_Host *shost = transport_class_to_shost(dev);
2065	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2066	struct fc_rport *rport;
2067	unsigned long val, flags;
2068	int rc;
2069
2070	rc = fc_str_to_dev_loss(buf, val: &val);
2071	if (rc)
2072	return rc;
2073
2074	fc_host_dev_loss_tmo(shost) = val;
2075	spin_lock_irqsave(shost->host_lock, flags);
2076	list_for_each_entry(rport, &fc_host->rports, peers)
2077	fc_rport_set_dev_loss_tmo(rport, val);
2078	spin_unlock_irqrestore(lock: shost->host_lock, flags);
2079	return count;
2080	}
2081
2082	fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
2083	static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
2084	show_fc_host_dev_loss_tmo,
2085	store_fc_private_host_dev_loss_tmo);
2086
2087	fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
2088
2089	/*
2090	* Host Statistics Management
2091	*/
2092
2093	/* Show a given attribute in the statistics group */
2094	static ssize_t
2095	fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
2096	{
2097	struct Scsi_Host *shost = transport_class_to_shost(dev);
2098	struct fc_internal *i = to_fc_internal(shost->transportt);
2099	struct fc_host_statistics *stats;
2100	ssize_t ret = -ENOENT;
2101
2102	if (offset > sizeof(struct fc_host_statistics) ||
2103	offset % sizeof(u64) != 0)
2104	WARN_ON(1);
2105
2106	if (i->f->get_fc_host_stats) {
2107	stats = (i->f->get_fc_host_stats)(shost);
2108	if (stats)
2109	ret = snprintf(buf, size: 20, fmt: "0x%llx\n",
2110	(unsigned long long)*(u64 *)(((u8 *) stats) + offset));
2111	}
2112	return ret;
2113	}
2114
2115
2116	/* generate a read-only statistics attribute */
2117	#define fc_host_statistic(name) \
2118	static ssize_t show_fcstat_##name(struct device *cd, \
2119	struct device_attribute *attr, \
2120	char *buf) \
2121	{ \
2122	return fc_stat_show(cd, buf, \
2123	offsetof(struct fc_host_statistics, name)); \
2124	} \
2125	static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
2126
2127	fc_host_statistic(seconds_since_last_reset);
2128	fc_host_statistic(tx_frames);
2129	fc_host_statistic(tx_words);
2130	fc_host_statistic(rx_frames);
2131	fc_host_statistic(rx_words);
2132	fc_host_statistic(lip_count);
2133	fc_host_statistic(nos_count);
2134	fc_host_statistic(error_frames);
2135	fc_host_statistic(dumped_frames);
2136	fc_host_statistic(link_failure_count);
2137	fc_host_statistic(loss_of_sync_count);
2138	fc_host_statistic(loss_of_signal_count);
2139	fc_host_statistic(prim_seq_protocol_err_count);
2140	fc_host_statistic(invalid_tx_word_count);
2141	fc_host_statistic(invalid_crc_count);
2142	fc_host_statistic(fcp_input_requests);
2143	fc_host_statistic(fcp_output_requests);
2144	fc_host_statistic(fcp_control_requests);
2145	fc_host_statistic(fcp_input_megabytes);
2146	fc_host_statistic(fcp_output_megabytes);
2147	fc_host_statistic(fcp_packet_alloc_failures);
2148	fc_host_statistic(fcp_packet_aborts);
2149	fc_host_statistic(fcp_frame_alloc_failures);
2150	fc_host_statistic(fc_no_free_exch);
2151	fc_host_statistic(fc_no_free_exch_xid);
2152	fc_host_statistic(fc_xid_not_found);
2153	fc_host_statistic(fc_xid_busy);
2154	fc_host_statistic(fc_seq_not_found);
2155	fc_host_statistic(fc_non_bls_resp);
2156	fc_host_statistic(cn_sig_warn);
2157	fc_host_statistic(cn_sig_alarm);
2158
2159
2160	#define fc_host_fpin_statistic(name) \
2161	static ssize_t fc_host_fpinstat_##name(struct device *cd, \
2162	struct device_attribute *attr, \
2163	char *buf) \
2164	{ \
2165	struct Scsi_Host *shost = transport_class_to_shost(cd); \
2166	struct fc_host_attrs *fc_host = shost_to_fc_host(shost); \
2167	\
2168	return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name); \
2169	} \
2170	static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
2171
2172	fc_host_fpin_statistic(dn);
2173	fc_host_fpin_statistic(dn_unknown);
2174	fc_host_fpin_statistic(dn_timeout);
2175	fc_host_fpin_statistic(dn_unable_to_route);
2176	fc_host_fpin_statistic(dn_device_specific);
2177	fc_host_fpin_statistic(cn);
2178	fc_host_fpin_statistic(cn_clear);
2179	fc_host_fpin_statistic(cn_lost_credit);
2180	fc_host_fpin_statistic(cn_credit_stall);
2181	fc_host_fpin_statistic(cn_oversubscription);
2182	fc_host_fpin_statistic(cn_device_specific);
2183	fc_host_fpin_statistic(li);
2184	fc_host_fpin_statistic(li_failure_unknown);
2185	fc_host_fpin_statistic(li_link_failure_count);
2186	fc_host_fpin_statistic(li_loss_of_sync_count);
2187	fc_host_fpin_statistic(li_loss_of_signals_count);
2188	fc_host_fpin_statistic(li_prim_seq_err_count);
2189	fc_host_fpin_statistic(li_invalid_tx_word_count);
2190	fc_host_fpin_statistic(li_invalid_crc_count);
2191	fc_host_fpin_statistic(li_device_specific);
2192
2193	static ssize_t
2194	fc_reset_statistics(struct device *dev, struct device_attribute *attr,
2195	const char *buf, size_t count)
2196	{
2197	struct Scsi_Host *shost = transport_class_to_shost(dev);
2198	struct fc_internal *i = to_fc_internal(shost->transportt);
2199
2200	/* ignore any data value written to the attribute */
2201	if (i->f->reset_fc_host_stats) {
2202	i->f->reset_fc_host_stats(shost);
2203	return count;
2204	}
2205
2206	return -ENOENT;
2207	}
2208	static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
2209	fc_reset_statistics);
2210
2211	static struct attribute *fc_statistics_attrs[] = {
2212	&device_attr_host_seconds_since_last_reset.attr,
2213	&device_attr_host_tx_frames.attr,
2214	&device_attr_host_tx_words.attr,
2215	&device_attr_host_rx_frames.attr,
2216	&device_attr_host_rx_words.attr,
2217	&device_attr_host_lip_count.attr,
2218	&device_attr_host_nos_count.attr,
2219	&device_attr_host_error_frames.attr,
2220	&device_attr_host_dumped_frames.attr,
2221	&device_attr_host_link_failure_count.attr,
2222	&device_attr_host_loss_of_sync_count.attr,
2223	&device_attr_host_loss_of_signal_count.attr,
2224	&device_attr_host_prim_seq_protocol_err_count.attr,
2225	&device_attr_host_invalid_tx_word_count.attr,
2226	&device_attr_host_invalid_crc_count.attr,
2227	&device_attr_host_fcp_input_requests.attr,
2228	&device_attr_host_fcp_output_requests.attr,
2229	&device_attr_host_fcp_control_requests.attr,
2230	&device_attr_host_fcp_input_megabytes.attr,
2231	&device_attr_host_fcp_output_megabytes.attr,
2232	&device_attr_host_fcp_packet_alloc_failures.attr,
2233	&device_attr_host_fcp_packet_aborts.attr,
2234	&device_attr_host_fcp_frame_alloc_failures.attr,
2235	&device_attr_host_fc_no_free_exch.attr,
2236	&device_attr_host_fc_no_free_exch_xid.attr,
2237	&device_attr_host_fc_xid_not_found.attr,
2238	&device_attr_host_fc_xid_busy.attr,
2239	&device_attr_host_fc_seq_not_found.attr,
2240	&device_attr_host_fc_non_bls_resp.attr,
2241	&device_attr_host_cn_sig_warn.attr,
2242	&device_attr_host_cn_sig_alarm.attr,
2243	&device_attr_host_reset_statistics.attr,
2244	&device_attr_host_fpin_dn.attr,
2245	&device_attr_host_fpin_dn_unknown.attr,
2246	&device_attr_host_fpin_dn_timeout.attr,
2247	&device_attr_host_fpin_dn_unable_to_route.attr,
2248	&device_attr_host_fpin_dn_device_specific.attr,
2249	&device_attr_host_fpin_li.attr,
2250	&device_attr_host_fpin_li_failure_unknown.attr,
2251	&device_attr_host_fpin_li_link_failure_count.attr,
2252	&device_attr_host_fpin_li_loss_of_sync_count.attr,
2253	&device_attr_host_fpin_li_loss_of_signals_count.attr,
2254	&device_attr_host_fpin_li_prim_seq_err_count.attr,
2255	&device_attr_host_fpin_li_invalid_tx_word_count.attr,
2256	&device_attr_host_fpin_li_invalid_crc_count.attr,
2257	&device_attr_host_fpin_li_device_specific.attr,
2258	&device_attr_host_fpin_cn.attr,
2259	&device_attr_host_fpin_cn_clear.attr,
2260	&device_attr_host_fpin_cn_lost_credit.attr,
2261	&device_attr_host_fpin_cn_credit_stall.attr,
2262	&device_attr_host_fpin_cn_oversubscription.attr,
2263	&device_attr_host_fpin_cn_device_specific.attr,
2264	NULL
2265	};
2266
2267	static struct attribute_group fc_statistics_group = {
2268	.name = "statistics",
2269	.attrs = fc_statistics_attrs,
2270	};
2271
2272
2273	/* Host Vport Attributes */
2274
2275	static int
2276	fc_parse_wwn(const char *ns, u64 *nm)
2277	{
2278	unsigned int i, j;
2279	u8 wwn[8];
2280
2281	memset(wwn, 0, sizeof(wwn));
2282
2283	/* Validate and store the new name */
2284	for (i=0, j=0; i < 16; i++) {
2285	int value;
2286
2287	value = hex_to_bin(ch: *ns++);
2288	if (value >= 0)
2289	j = (j << 4) | value;
2290	else
2291	return -EINVAL;
2292	if (i % 2) {
2293	wwn[i/2] = j & 0xff;
2294	j = 0;
2295	}
2296	}
2297
2298	*nm = wwn_to_u64(wwn);
2299
2300	return 0;
2301	}
2302
2303
2304	/*
2305	* "Short-cut" sysfs variable to create a new vport on a FC Host.
2306	* Input is a string of the form "<WWPN>:<WWNN>". Other attributes
2307	* will default to a NPIV-based FCP_Initiator; The WWNs are specified
2308	* as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
2309	*/
2310	static ssize_t
2311	store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
2312	const char *buf, size_t count)
2313	{
2314	struct Scsi_Host *shost = transport_class_to_shost(dev);
2315	struct fc_vport_identifiers vid;
2316	struct fc_vport *vport;
2317	unsigned int cnt=count;
2318	int stat;
2319
2320	memset(&vid, 0, sizeof(vid));
2321
2322	/* count may include a LF at end of string */
2323	if (buf[cnt-1] == '\n')
2324	cnt--;
2325
2326	/* validate we have enough characters for WWPN */
2327	if ((cnt != (16+1+16)) || (buf[16] != ':'))
2328	return -EINVAL;
2329
2330	stat = fc_parse_wwn(ns: &buf[0], nm: &vid.port_name);
2331	if (stat)
2332	return stat;
2333
2334	stat = fc_parse_wwn(ns: &buf[17], nm: &vid.node_name);
2335	if (stat)
2336	return stat;
2337
2338	vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
2339	vid.vport_type = FC_PORTTYPE_NPIV;
2340	/* vid.symbolic_name is already zero/NULL's */
2341	vid.disable = false; /* always enabled */
2342
2343	/* we only allow support on Channel 0 !!! */
2344	stat = fc_vport_setup(shost, channel: 0, pdev: &shost->shost_gendev, ids: &vid, vport: &vport);
2345	return stat ? stat : count;
2346	}
2347	static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
2348	store_fc_host_vport_create);
2349
2350
2351	/*
2352	* "Short-cut" sysfs variable to delete a vport on a FC Host.
2353	* Vport is identified by a string containing "<WWPN>:<WWNN>".
2354	* The WWNs are specified as hex characters, and may *not* contain
2355	* any prefixes (e.g. 0x, x, etc)
2356	*/
2357	static ssize_t
2358	store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
2359	const char *buf, size_t count)
2360	{
2361	struct Scsi_Host *shost = transport_class_to_shost(dev);
2362	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2363	struct fc_vport *vport;
2364	u64 wwpn, wwnn;
2365	unsigned long flags;
2366	unsigned int cnt=count;
2367	int stat, match;
2368
2369	/* count may include a LF at end of string */
2370	if (buf[cnt-1] == '\n')
2371	cnt--;
2372
2373	/* validate we have enough characters for WWPN */
2374	if ((cnt != (16+1+16)) || (buf[16] != ':'))
2375	return -EINVAL;
2376
2377	stat = fc_parse_wwn(ns: &buf[0], nm: &wwpn);
2378	if (stat)
2379	return stat;
2380
2381	stat = fc_parse_wwn(ns: &buf[17], nm: &wwnn);
2382	if (stat)
2383	return stat;
2384
2385	spin_lock_irqsave(shost->host_lock, flags);
2386	match = 0;
2387	/* we only allow support on Channel 0 !!! */
2388	list_for_each_entry(vport, &fc_host->vports, peers) {
2389	if ((vport->channel == 0) &&
2390	(vport->port_name == wwpn) && (vport->node_name == wwnn)) {
2391	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
2392	break;
2393	vport->flags |= FC_VPORT_DELETING;
2394	match = 1;
2395	break;
2396	}
2397	}
2398	spin_unlock_irqrestore(lock: shost->host_lock, flags);
2399
2400	if (!match)
2401	return -ENODEV;
2402
2403	stat = fc_vport_terminate(vport);
2404	return stat ? stat : count;
2405	}
2406	static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
2407	store_fc_host_vport_delete);
2408
2409
2410	static int fc_host_match(struct attribute_container *cont,
2411	struct device *dev)
2412	{
2413	struct Scsi_Host *shost;
2414	struct fc_internal *i;
2415
2416	if (!scsi_is_host_device(dev))
2417	return 0;
2418
2419	shost = dev_to_shost(dev);
2420	if (!shost->transportt || shost->transportt->host_attrs.ac.class
2421	!= &fc_host_class.class)
2422	return 0;
2423
2424	i = to_fc_internal(shost->transportt);
2425
2426	return &i->t.host_attrs.ac == cont;
2427	}
2428
2429	static int fc_target_match(struct attribute_container *cont,
2430	struct device *dev)
2431	{
2432	struct Scsi_Host *shost;
2433	struct fc_internal *i;
2434
2435	if (!scsi_is_target_device(dev))
2436	return 0;
2437
2438	shost = dev_to_shost(dev: dev->parent);
2439	if (!shost->transportt || shost->transportt->host_attrs.ac.class
2440	!= &fc_host_class.class)
2441	return 0;
2442
2443	i = to_fc_internal(shost->transportt);
2444
2445	return &i->t.target_attrs.ac == cont;
2446	}
2447
2448	static void fc_rport_dev_release(struct device *dev)
2449	{
2450	struct fc_rport *rport = dev_to_rport(dev);
2451	put_device(dev: dev->parent);
2452	kfree(objp: rport);
2453	}
2454
2455	int scsi_is_fc_rport(const struct device *dev)
2456	{
2457	return dev->release == fc_rport_dev_release;
2458	}
2459	EXPORT_SYMBOL(scsi_is_fc_rport);
2460
2461	static int fc_rport_match(struct attribute_container *cont,
2462	struct device *dev)
2463	{
2464	struct Scsi_Host *shost;
2465	struct fc_internal *i;
2466
2467	if (!scsi_is_fc_rport(dev))
2468	return 0;
2469
2470	shost = dev_to_shost(dev: dev->parent);
2471	if (!shost->transportt || shost->transportt->host_attrs.ac.class
2472	!= &fc_host_class.class)
2473	return 0;
2474
2475	i = to_fc_internal(shost->transportt);
2476
2477	return &i->rport_attr_cont.ac == cont;
2478	}
2479
2480
2481	static void fc_vport_dev_release(struct device *dev)
2482	{
2483	struct fc_vport *vport = dev_to_vport(dev);
2484	put_device(dev: dev->parent); /* release kobj parent */
2485	kfree(objp: vport);
2486	}
2487
2488	static int scsi_is_fc_vport(const struct device *dev)
2489	{
2490	return dev->release == fc_vport_dev_release;
2491	}
2492
2493	static int fc_vport_match(struct attribute_container *cont,
2494	struct device *dev)
2495	{
2496	struct fc_vport *vport;
2497	struct Scsi_Host *shost;
2498	struct fc_internal *i;
2499
2500	if (!scsi_is_fc_vport(dev))
2501	return 0;
2502	vport = dev_to_vport(dev);
2503
2504	shost = vport_to_shost(vport);
2505	if (!shost->transportt || shost->transportt->host_attrs.ac.class
2506	!= &fc_host_class.class)
2507	return 0;
2508
2509	i = to_fc_internal(shost->transportt);
2510	return &i->vport_attr_cont.ac == cont;
2511	}
2512
2513
2514	/**
2515	* fc_eh_timed_out - FC Transport I/O timeout intercept handler
2516	* @scmd: The SCSI command which timed out
2517	*
2518	* This routine protects against error handlers getting invoked while a
2519	* rport is in a blocked state, typically due to a temporarily loss of
2520	* connectivity. If the error handlers are allowed to proceed, requests
2521	* to abort i/o, reset the target, etc will likely fail as there is no way
2522	* to communicate with the device to perform the requested function. These
2523	* failures may result in the midlayer taking the device offline, requiring
2524	* manual intervention to restore operation.
2525	*
2526	* This routine, called whenever an i/o times out, validates the state of
2527	* the underlying rport. If the rport is blocked, it returns
2528	* EH_RESET_TIMER, which will continue to reschedule the timeout.
2529	* Eventually, either the device will return, or devloss_tmo will fire,
2530	* and when the timeout then fires, it will be handled normally.
2531	* If the rport is not blocked, normal error handling continues.
2532	*
2533	* Notes:
2534	* This routine assumes no locks are held on entry.
2535	*/
2536	enum scsi_timeout_action fc_eh_timed_out(struct scsi_cmnd *scmd)
2537	{
2538	struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2539
2540	if (rport->port_state == FC_PORTSTATE_BLOCKED)
2541	return SCSI_EH_RESET_TIMER;
2542
2543	return SCSI_EH_NOT_HANDLED;
2544	}
2545	EXPORT_SYMBOL(fc_eh_timed_out);
2546
2547	/*
2548	* Called by fc_user_scan to locate an rport on the shost that
2549	* matches the channel and target id, and invoke scsi_scan_target()
2550	* on the rport.
2551	*/
2552	static void
2553	fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2554	{
2555	struct fc_rport *rport;
2556	unsigned long flags;
2557
2558	spin_lock_irqsave(shost->host_lock, flags);
2559
2560	list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2561	if (rport->scsi_target_id == -1)
2562	continue;
2563
2564	if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
2565	(rport->port_state != FC_PORTSTATE_MARGINAL))
2566	continue;
2567
2568	if ((channel == rport->channel) &&
2569	(id == rport->scsi_target_id)) {
2570	spin_unlock_irqrestore(lock: shost->host_lock, flags);
2571	scsi_scan_target(parent: &rport->dev, channel, id, lun,
2572	rescan: SCSI_SCAN_MANUAL);
2573	return;
2574	}
2575	}
2576
2577	spin_unlock_irqrestore(lock: shost->host_lock, flags);
2578	}
2579
2580	/*
2581	* Called via sysfs scan routines. Necessary, as the FC transport
2582	* wants to place all target objects below the rport object. So this
2583	* routine must invoke the scsi_scan_target() routine with the rport
2584	* object as the parent.
2585	*/
2586	static int
2587	fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2588	{
2589	uint chlo, chhi;
2590	uint tgtlo, tgthi;
2591
2592	if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2593	((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2594	((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2595	return -EINVAL;
2596
2597	if (channel == SCAN_WILD_CARD) {
2598	chlo = 0;
2599	chhi = shost->max_channel + 1;
2600	} else {
2601	chlo = channel;
2602	chhi = channel + 1;
2603	}
2604
2605	if (id == SCAN_WILD_CARD) {
2606	tgtlo = 0;
2607	tgthi = shost->max_id;
2608	} else {
2609	tgtlo = id;
2610	tgthi = id + 1;
2611	}
2612
2613	for ( ; chlo < chhi; chlo++)
2614	for ( ; tgtlo < tgthi; tgtlo++)
2615	fc_user_scan_tgt(shost, channel: chlo, id: tgtlo, lun);
2616
2617	return 0;
2618	}
2619
2620	struct scsi_transport_template *
2621	fc_attach_transport(struct fc_function_template *ft)
2622	{
2623	int count;
2624	struct fc_internal *i = kzalloc(size: sizeof(struct fc_internal),
2625	GFP_KERNEL);
2626
2627	if (unlikely(!i))
2628	return NULL;
2629
2630	i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2631	i->t.target_attrs.ac.class = &fc_transport_class.class;
2632	i->t.target_attrs.ac.match = fc_target_match;
2633	i->t.target_size = sizeof(struct fc_starget_attrs);
2634	transport_container_register(tc: &i->t.target_attrs);
2635
2636	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2637	i->t.host_attrs.ac.class = &fc_host_class.class;
2638	i->t.host_attrs.ac.match = fc_host_match;
2639	i->t.host_size = sizeof(struct fc_host_attrs);
2640	if (ft->get_fc_host_stats)
2641	i->t.host_attrs.statistics = &fc_statistics_group;
2642	transport_container_register(tc: &i->t.host_attrs);
2643
2644	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2645	i->rport_attr_cont.ac.class = &fc_rport_class.class;
2646	i->rport_attr_cont.ac.match = fc_rport_match;
2647	i->rport_attr_cont.statistics = &fc_rport_statistics_group;
2648	transport_container_register(tc: &i->rport_attr_cont);
2649
2650	i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2651	i->vport_attr_cont.ac.class = &fc_vport_class.class;
2652	i->vport_attr_cont.ac.match = fc_vport_match;
2653	transport_container_register(tc: &i->vport_attr_cont);
2654
2655	i->f = ft;
2656
2657	/* Transport uses the shost workq for scsi scanning */
2658	i->t.create_work_queue = 1;
2659
2660	i->t.user_scan = fc_user_scan;
2661
2662	/*
2663	* Setup SCSI Target Attributes.
2664	*/
2665	count = 0;
2666	SETUP_STARGET_ATTRIBUTE_RD(node_name);
2667	SETUP_STARGET_ATTRIBUTE_RD(port_name);
2668	SETUP_STARGET_ATTRIBUTE_RD(port_id);
2669
2670	BUG_ON(count > FC_STARGET_NUM_ATTRS);
2671
2672	i->starget_attrs[count] = NULL;
2673
2674
2675	/*
2676	* Setup SCSI Host Attributes.
2677	*/
2678	count=0;
2679	SETUP_HOST_ATTRIBUTE_RD(node_name);
2680	SETUP_HOST_ATTRIBUTE_RD(port_name);
2681	SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2682	SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2683	SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2684	SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2685	SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2686	if (ft->vport_create) {
2687	SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2688	SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2689	}
2690	SETUP_HOST_ATTRIBUTE_RD(serial_number);
2691	SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2692	SETUP_HOST_ATTRIBUTE_RD(model);
2693	SETUP_HOST_ATTRIBUTE_RD(model_description);
2694	SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2695	SETUP_HOST_ATTRIBUTE_RD(driver_version);
2696	SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2697	SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2698
2699	SETUP_HOST_ATTRIBUTE_RD(port_id);
2700	SETUP_HOST_ATTRIBUTE_RD(port_type);
2701	SETUP_HOST_ATTRIBUTE_RD(port_state);
2702	SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2703	SETUP_HOST_ATTRIBUTE_RD(speed);
2704	SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2705	SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2706	SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2707
2708	/* Transport-managed attributes */
2709	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2710	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2711	if (ft->issue_fc_host_lip)
2712	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2713	if (ft->vport_create)
2714	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2715	if (ft->vport_delete)
2716	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2717
2718	BUG_ON(count > FC_HOST_NUM_ATTRS);
2719
2720	i->host_attrs[count] = NULL;
2721
2722	/*
2723	* Setup Remote Port Attributes.
2724	*/
2725	count=0;
2726	SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2727	SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2728	SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2729	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2730	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2731	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2732	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2733	SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(port_state);
2734	SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2735	SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2736
2737	BUG_ON(count > FC_RPORT_NUM_ATTRS);
2738
2739	i->rport_attrs[count] = NULL;
2740
2741	/*
2742	* Setup Virtual Port Attributes.
2743	*/
2744	count=0;
2745	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2746	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2747	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2748	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2749	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2750	SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2751	SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2752	SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2753	SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2754
2755	BUG_ON(count > FC_VPORT_NUM_ATTRS);
2756
2757	i->vport_attrs[count] = NULL;
2758
2759	return &i->t;
2760	}
2761	EXPORT_SYMBOL(fc_attach_transport);
2762
2763	void fc_release_transport(struct scsi_transport_template *t)
2764	{
2765	struct fc_internal *i = to_fc_internal(t);
2766
2767	transport_container_unregister(tc: &i->t.target_attrs);
2768	transport_container_unregister(tc: &i->t.host_attrs);
2769	transport_container_unregister(tc: &i->rport_attr_cont);
2770	transport_container_unregister(tc: &i->vport_attr_cont);
2771
2772	kfree(objp: i);
2773	}
2774	EXPORT_SYMBOL(fc_release_transport);
2775
2776	/**
2777	* fc_queue_work - Queue work to the fc_host workqueue.
2778	* @shost: Pointer to Scsi_Host bound to fc_host.
2779	* @work: Work to queue for execution.
2780	*
2781	* Return value:
2782	* 1 - work queued for execution
2783	* 0 - work is already queued
2784	* -EINVAL - work queue doesn't exist
2785	*/
2786	static int
2787	fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2788	{
2789	if (unlikely(!fc_host_work_q(shost))) {
2790	printk(KERN_ERR
2791	"ERROR: FC host '%s' attempted to queue work, "
2792	"when no workqueue created.\n", shost->hostt->name);
2793	dump_stack();
2794
2795	return -EINVAL;
2796	}
2797
2798	return queue_work(fc_host_work_q(shost), work);
2799	}
2800
2801	/**
2802	* fc_flush_work - Flush a fc_host's workqueue.
2803	* @shost: Pointer to Scsi_Host bound to fc_host.
2804	*/
2805	static void
2806	fc_flush_work(struct Scsi_Host *shost)
2807	{
2808	if (!fc_host_work_q(shost)) {
2809	printk(KERN_ERR
2810	"ERROR: FC host '%s' attempted to flush work, "
2811	"when no workqueue created.\n", shost->hostt->name);
2812	dump_stack();
2813	return;
2814	}
2815
2816	flush_workqueue(fc_host_work_q(shost));
2817	}
2818
2819	/**
2820	* fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2821	* @shost: Pointer to Scsi_Host bound to fc_host.
2822	* @work: Work to queue for execution.
2823	* @delay: jiffies to delay the work queuing
2824	*
2825	* Return value:
2826	* 1 on success / 0 already queued / < 0 for error
2827	*/
2828	static int
2829	fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2830	unsigned long delay)
2831	{
2832	if (unlikely(!fc_host_devloss_work_q(shost))) {
2833	printk(KERN_ERR
2834	"ERROR: FC host '%s' attempted to queue work, "
2835	"when no workqueue created.\n", shost->hostt->name);
2836	dump_stack();
2837
2838	return -EINVAL;
2839	}
2840
2841	return queue_delayed_work(fc_host_devloss_work_q(shost), dwork: work, delay);
2842	}
2843
2844	/**
2845	* fc_flush_devloss - Flush a fc_host's devloss workqueue.
2846	* @shost: Pointer to Scsi_Host bound to fc_host.
2847	*/
2848	static void
2849	fc_flush_devloss(struct Scsi_Host *shost)
2850	{
2851	if (!fc_host_devloss_work_q(shost)) {
2852	printk(KERN_ERR
2853	"ERROR: FC host '%s' attempted to flush work, "
2854	"when no workqueue created.\n", shost->hostt->name);
2855	dump_stack();
2856	return;
2857	}
2858
2859	flush_workqueue(fc_host_devloss_work_q(shost));
2860	}
2861
2862
2863	/**
2864	* fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2865	* @shost: Which &Scsi_Host
2866	*
2867	* This routine is expected to be called immediately preceding the
2868	* a driver's call to scsi_remove_host().
2869	*
2870	* WARNING: A driver utilizing the fc_transport, which fails to call
2871	* this routine prior to scsi_remove_host(), will leave dangling
2872	* objects in /sys/class/fc_remote_ports. Access to any of these
2873	* objects can result in a system crash !!!
2874	*
2875	* Notes:
2876	* This routine assumes no locks are held on entry.
2877	*/
2878	void
2879	fc_remove_host(struct Scsi_Host *shost)
2880	{
2881	struct fc_vport *vport = NULL, *next_vport = NULL;
2882	struct fc_rport *rport = NULL, *next_rport = NULL;
2883	struct workqueue_struct *work_q;
2884	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2885	unsigned long flags;
2886
2887	spin_lock_irqsave(shost->host_lock, flags);
2888
2889	/* Remove any vports */
2890	list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2891	vport->flags |= FC_VPORT_DELETING;
2892	fc_queue_work(shost, work: &vport->vport_delete_work);
2893	}
2894
2895	/* Remove any remote ports */
2896	list_for_each_entry_safe(rport, next_rport,
2897	&fc_host->rports, peers) {
2898	list_del(entry: &rport->peers);
2899	rport->port_state = FC_PORTSTATE_DELETED;
2900	fc_queue_work(shost, work: &rport->rport_delete_work);
2901	}
2902
2903	list_for_each_entry_safe(rport, next_rport,
2904	&fc_host->rport_bindings, peers) {
2905	list_del(entry: &rport->peers);
2906	rport->port_state = FC_PORTSTATE_DELETED;
2907	fc_queue_work(shost, work: &rport->rport_delete_work);
2908	}
2909
2910	spin_unlock_irqrestore(lock: shost->host_lock, flags);
2911
2912	/* flush all scan work items */
2913	scsi_flush_work(shost);
2914
2915	/* flush all stgt delete, and rport delete work items, then kill it */
2916	if (fc_host->work_q) {
2917	work_q = fc_host->work_q;
2918	fc_host->work_q = NULL;
2919	destroy_workqueue(wq: work_q);
2920	}
2921
2922	/* flush all devloss work items, then kill it */
2923	if (fc_host->devloss_work_q) {
2924	work_q = fc_host->devloss_work_q;
2925	fc_host->devloss_work_q = NULL;
2926	destroy_workqueue(wq: work_q);
2927	}
2928	}
2929	EXPORT_SYMBOL(fc_remove_host);
2930
2931	static void fc_terminate_rport_io(struct fc_rport *rport)
2932	{
2933	struct Scsi_Host *shost = rport_to_shost(rport);
2934	struct fc_internal *i = to_fc_internal(shost->transportt);
2935
2936	/* Involve the LLDD if possible to terminate all io on the rport. */
2937	if (i->f->terminate_rport_io)
2938	i->f->terminate_rport_io(rport);
2939
2940	/*
2941	* Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2942	*/
2943	scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2944	}
2945
2946	/**
2947	* fc_starget_delete - called to delete the scsi descendants of an rport
2948	* @work: remote port to be operated on.
2949	*
2950	* Deletes target and all sdevs.
2951	*/
2952	static void
2953	fc_starget_delete(struct work_struct *work)
2954	{
2955	struct fc_rport *rport =
2956	container_of(work, struct fc_rport, stgt_delete_work);
2957
2958	fc_terminate_rport_io(rport);
2959	scsi_remove_target(&rport->dev);
2960	}
2961
2962
2963	/**
2964	* fc_rport_final_delete - finish rport termination and delete it.
2965	* @work: remote port to be deleted.
2966	*/
2967	static void
2968	fc_rport_final_delete(struct work_struct *work)
2969	{
2970	struct fc_rport *rport =
2971	container_of(work, struct fc_rport, rport_delete_work);
2972	struct device *dev = &rport->dev;
2973	struct Scsi_Host *shost = rport_to_shost(rport);
2974	struct fc_internal *i = to_fc_internal(shost->transportt);
2975	unsigned long flags;
2976	int do_callback = 0;
2977
2978	fc_terminate_rport_io(rport);
2979
2980	/*
2981	* if a scan is pending, flush the SCSI Host work_q so that
2982	* that we can reclaim the rport scan work element.
2983	*/
2984	if (rport->flags & FC_RPORT_SCAN_PENDING)
2985	scsi_flush_work(shost);
2986
2987	/*
2988	* Cancel any outstanding timers. These should really exist
2989	* only when rmmod'ing the LLDD and we're asking for
2990	* immediate termination of the rports
2991	*/
2992	spin_lock_irqsave(shost->host_lock, flags);
2993	if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2994	spin_unlock_irqrestore(lock: shost->host_lock, flags);
2995	if (!cancel_delayed_work(dwork: &rport->fail_io_work))
2996	fc_flush_devloss(shost);
2997	if (!cancel_delayed_work(dwork: &rport->dev_loss_work))
2998	fc_flush_devloss(shost);
2999	cancel_work_sync(work: &rport->scan_work);
3000	spin_lock_irqsave(shost->host_lock, flags);
3001	rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3002	}
3003	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3004
3005	/* Delete SCSI target and sdevs */
3006	if (rport->scsi_target_id != -1)
3007	fc_starget_delete(work: &rport->stgt_delete_work);
3008
3009	/*
3010	* Notify the driver that the rport is now dead. The LLDD will
3011	* also guarantee that any communication to the rport is terminated
3012	*
3013	* Avoid this call if we already called it when we preserved the
3014	* rport for the binding.
3015	*/
3016	spin_lock_irqsave(shost->host_lock, flags);
3017	if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
3018	(i->f->dev_loss_tmo_callbk)) {
3019	rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3020	do_callback = 1;
3021	}
3022	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3023
3024	if (do_callback)
3025	i->f->dev_loss_tmo_callbk(rport);
3026
3027	fc_bsg_remove(rport->rqst_q);
3028
3029	transport_remove_device(dev);
3030	device_del(dev);
3031	transport_destroy_device(dev);
3032	scsi_host_put(t: shost); /* for fc_host->rport list */
3033	put_device(dev); /* for self-reference */
3034	}
3035
3036
3037	/**
3038	* fc_remote_port_create - allocates and creates a remote FC port.
3039	* @shost: scsi host the remote port is connected to.
3040	* @channel: Channel on shost port connected to.
3041	* @ids: The world wide names, fc address, and FC4 port
3042	* roles for the remote port.
3043	*
3044	* Allocates and creates the remoter port structure, including the
3045	* class and sysfs creation.
3046	*
3047	* Notes:
3048	* This routine assumes no locks are held on entry.
3049	*/
3050	static struct fc_rport *
3051	fc_remote_port_create(struct Scsi_Host *shost, int channel,
3052	struct fc_rport_identifiers *ids)
3053	{
3054	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3055	struct fc_internal *fci = to_fc_internal(shost->transportt);
3056	struct fc_rport *rport;
3057	struct device *dev;
3058	unsigned long flags;
3059	int error;
3060	size_t size;
3061
3062	size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
3063	rport = kzalloc(size, GFP_KERNEL);
3064	if (unlikely(!rport)) {
3065	printk(KERN_ERR "%s: allocation failure\n", __func__);
3066	return NULL;
3067	}
3068
3069	rport->maxframe_size = -1;
3070	rport->supported_classes = FC_COS_UNSPECIFIED;
3071	rport->dev_loss_tmo = fc_host->dev_loss_tmo;
3072	memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
3073	memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
3074	rport->port_id = ids->port_id;
3075	rport->roles = ids->roles;
3076	rport->port_state = FC_PORTSTATE_ONLINE;
3077	if (fci->f->dd_fcrport_size)
3078	rport->dd_data = &rport[1];
3079	rport->channel = channel;
3080	rport->fast_io_fail_tmo = -1;
3081
3082	INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
3083	INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
3084	INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
3085	INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
3086	INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
3087
3088	spin_lock_irqsave(shost->host_lock, flags);
3089
3090	rport->number = fc_host->next_rport_number++;
3091	if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
3092	(rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
3093	rport->scsi_target_id = fc_host->next_target_id++;
3094	else
3095	rport->scsi_target_id = -1;
3096	list_add_tail(new: &rport->peers, head: &fc_host->rports);
3097	scsi_host_get(shost); /* for fc_host->rport list */
3098
3099	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3100
3101	dev = &rport->dev;
3102	device_initialize(dev); /* takes self reference */
3103	dev->parent = get_device(dev: &shost->shost_gendev); /* parent reference */
3104	dev->release = fc_rport_dev_release;
3105	dev_set_name(dev, name: "rport-%d:%d-%d",
3106	shost->host_no, channel, rport->number);
3107	transport_setup_device(dev);
3108
3109	error = device_add(dev);
3110	if (error) {
3111	printk(KERN_ERR "FC Remote Port device_add failed\n");
3112	goto delete_rport;
3113	}
3114	transport_add_device(dev);
3115	transport_configure_device(dev);
3116
3117	fc_bsg_rportadd(shost, rport);
3118	/* ignore any bsg add error - we just can't do sgio */
3119
3120	if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
3121	/* initiate a scan of the target */
3122	rport->flags |= FC_RPORT_SCAN_PENDING;
3123	scsi_queue_work(shost, &rport->scan_work);
3124	}
3125
3126	return rport;
3127
3128	delete_rport:
3129	transport_destroy_device(dev);
3130	spin_lock_irqsave(shost->host_lock, flags);
3131	list_del(entry: &rport->peers);
3132	scsi_host_put(t: shost); /* for fc_host->rport list */
3133	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3134	put_device(dev: dev->parent);
3135	kfree(objp: rport);
3136	return NULL;
3137	}
3138
3139	/**
3140	* fc_remote_port_add - notify fc transport of the existence of a remote FC port.
3141	* @shost: scsi host the remote port is connected to.
3142	* @channel: Channel on shost port connected to.
3143	* @ids: The world wide names, fc address, and FC4 port
3144	* roles for the remote port.
3145	*
3146	* The LLDD calls this routine to notify the transport of the existence
3147	* of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
3148	* of the port, it's FC address (port_id), and the FC4 roles that are
3149	* active for the port.
3150	*
3151	* For ports that are FCP targets (aka scsi targets), the FC transport
3152	* maintains consistent target id bindings on behalf of the LLDD.
3153	* A consistent target id binding is an assignment of a target id to
3154	* a remote port identifier, which persists while the scsi host is
3155	* attached. The remote port can disappear, then later reappear, and
3156	* it's target id assignment remains the same. This allows for shifts
3157	* in FC addressing (if binding by wwpn or wwnn) with no apparent
3158	* changes to the scsi subsystem which is based on scsi host number and
3159	* target id values. Bindings are only valid during the attachment of
3160	* the scsi host. If the host detaches, then later re-attaches, target
3161	* id bindings may change.
3162	*
3163	* This routine is responsible for returning a remote port structure.
3164	* The routine will search the list of remote ports it maintains
3165	* internally on behalf of consistent target id mappings. If found, the
3166	* remote port structure will be reused. Otherwise, a new remote port
3167	* structure will be allocated.
3168	*
3169	* Whenever a remote port is allocated, a new fc_remote_port class
3170	* device is created.
3171	*
3172	* Should not be called from interrupt context.
3173	*
3174	* Notes:
3175	* This routine assumes no locks are held on entry.
3176	*/
3177	struct fc_rport *
3178	fc_remote_port_add(struct Scsi_Host *shost, int channel,
3179	struct fc_rport_identifiers *ids)
3180	{
3181	struct fc_internal *fci = to_fc_internal(shost->transportt);
3182	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3183	struct fc_rport *rport;
3184	unsigned long flags;
3185	int match = 0;
3186
3187	/* ensure any stgt delete functions are done */
3188	fc_flush_work(shost);
3189
3190	/*
3191	* Search the list of "active" rports, for an rport that has been
3192	* deleted, but we've held off the real delete while the target
3193	* is in a "blocked" state.
3194	*/
3195	spin_lock_irqsave(shost->host_lock, flags);
3196
3197	list_for_each_entry(rport, &fc_host->rports, peers) {
3198
3199	if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
3200	rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
3201	(rport->channel == channel)) {
3202
3203	switch (fc_host->tgtid_bind_type) {
3204	case FC_TGTID_BIND_BY_WWPN:
3205	case FC_TGTID_BIND_NONE:
3206	if (rport->port_name == ids->port_name)
3207	match = 1;
3208	break;
3209	case FC_TGTID_BIND_BY_WWNN:
3210	if (rport->node_name == ids->node_name)
3211	match = 1;
3212	break;
3213	case FC_TGTID_BIND_BY_ID:
3214	if (rport->port_id == ids->port_id)
3215	match = 1;
3216	break;
3217	}
3218
3219	if (match) {
3220
3221	memcpy(&rport->node_name, &ids->node_name,
3222	sizeof(rport->node_name));
3223	memcpy(&rport->port_name, &ids->port_name,
3224	sizeof(rport->port_name));
3225	rport->port_id = ids->port_id;
3226
3227	rport->port_state = FC_PORTSTATE_ONLINE;
3228	rport->roles = ids->roles;
3229
3230	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3231
3232	if (fci->f->dd_fcrport_size)
3233	memset(rport->dd_data, 0,
3234	fci->f->dd_fcrport_size);
3235
3236	/*
3237	* If we were not a target, cancel the
3238	* io terminate and rport timers, and
3239	* we're done.
3240	*
3241	* If we were a target, but our new role
3242	* doesn't indicate a target, leave the
3243	* timers running expecting the role to
3244	* change as the target fully logs in. If
3245	* it doesn't, the target will be torn down.
3246	*
3247	* If we were a target, and our role shows
3248	* we're still a target, cancel the timers
3249	* and kick off a scan.
3250	*/
3251
3252	/* was a target, not in roles */
3253	if ((rport->scsi_target_id != -1) &&
3254	(!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
3255	return rport;
3256
3257	/*
3258	* Stop the fail io and dev_loss timers.
3259	* If they flush, the port_state will
3260	* be checked and will NOOP the function.
3261	*/
3262	if (!cancel_delayed_work(dwork: &rport->fail_io_work))
3263	fc_flush_devloss(shost);
3264	if (!cancel_delayed_work(dwork: &rport->dev_loss_work))
3265	fc_flush_devloss(shost);
3266
3267	spin_lock_irqsave(shost->host_lock, flags);
3268
3269	rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3270	FC_RPORT_DEVLOSS_PENDING |
3271	FC_RPORT_DEVLOSS_CALLBK_DONE);
3272
3273	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3274
3275	/* if target, initiate a scan */
3276	if (rport->scsi_target_id != -1) {
3277	scsi_target_unblock(&rport->dev,
3278	SDEV_RUNNING);
3279	spin_lock_irqsave(shost->host_lock,
3280	flags);
3281	rport->flags |= FC_RPORT_SCAN_PENDING;
3282	scsi_queue_work(shost,
3283	&rport->scan_work);
3284	spin_unlock_irqrestore(lock: shost->host_lock,
3285	flags);
3286	}
3287
3288	fc_bsg_goose_queue(rport);
3289
3290	return rport;
3291	}
3292	}
3293	}
3294
3295	/*
3296	* Search the bindings array
3297	* Note: if never a FCP target, you won't be on this list
3298	*/
3299	if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
3300
3301	/* search for a matching consistent binding */
3302
3303	list_for_each_entry(rport, &fc_host->rport_bindings,
3304	peers) {
3305	if (rport->channel != channel)
3306	continue;
3307
3308	switch (fc_host->tgtid_bind_type) {
3309	case FC_TGTID_BIND_BY_WWPN:
3310	if (rport->port_name == ids->port_name)
3311	match = 1;
3312	break;
3313	case FC_TGTID_BIND_BY_WWNN:
3314	if (rport->node_name == ids->node_name)
3315	match = 1;
3316	break;
3317	case FC_TGTID_BIND_BY_ID:
3318	if (rport->port_id == ids->port_id)
3319	match = 1;
3320	break;
3321	case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3322	break;
3323	}
3324
3325	if (match) {
3326	list_move_tail(list: &rport->peers, head: &fc_host->rports);
3327	break;
3328	}
3329	}
3330
3331	if (match) {
3332	memcpy(&rport->node_name, &ids->node_name,
3333	sizeof(rport->node_name));
3334	memcpy(&rport->port_name, &ids->port_name,
3335	sizeof(rport->port_name));
3336	rport->port_id = ids->port_id;
3337	rport->port_state = FC_PORTSTATE_ONLINE;
3338	rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3339
3340	if (fci->f->dd_fcrport_size)
3341	memset(rport->dd_data, 0,
3342	fci->f->dd_fcrport_size);
3343	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3344
3345	fc_remote_port_rolechg(rport, roles: ids->roles);
3346	return rport;
3347	}
3348	}
3349
3350	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3351
3352	/* No consistent binding found - create new remote port entry */
3353	rport = fc_remote_port_create(shost, channel, ids);
3354
3355	return rport;
3356	}
3357	EXPORT_SYMBOL(fc_remote_port_add);
3358
3359
3360	/**
3361	* fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
3362	* @rport: The remote port that no longer exists
3363	*
3364	* The LLDD calls this routine to notify the transport that a remote
3365	* port is no longer part of the topology. Note: Although a port
3366	* may no longer be part of the topology, it may persist in the remote
3367	* ports displayed by the fc_host. We do this under 2 conditions:
3368	*
3369	* 1) If the port was a scsi target, we delay its deletion by "blocking" it.
3370	* This allows the port to temporarily disappear, then reappear without
3371	* disrupting the SCSI device tree attached to it. During the "blocked"
3372	* period the port will still exist.
3373	*
3374	* 2) If the port was a scsi target and disappears for longer than we
3375	* expect, we'll delete the port and the tear down the SCSI device tree
3376	* attached to it. However, we want to semi-persist the target id assigned
3377	* to that port if it eventually does exist. The port structure will
3378	* remain (although with minimal information) so that the target id
3379	* bindings also remain.
3380	*
3381	* If the remote port is not an FCP Target, it will be fully torn down
3382	* and deallocated, including the fc_remote_port class device.
3383	*
3384	* If the remote port is an FCP Target, the port will be placed in a
3385	* temporary blocked state. From the LLDD's perspective, the rport no
3386	* longer exists. From the SCSI midlayer's perspective, the SCSI target
3387	* exists, but all sdevs on it are blocked from further I/O. The following
3388	* is then expected.
3389	*
3390	* If the remote port does not return (signaled by a LLDD call to
3391	* fc_remote_port_add()) within the dev_loss_tmo timeout, then the
3392	* scsi target is removed - killing all outstanding i/o and removing the
3393	* scsi devices attached to it. The port structure will be marked Not
3394	* Present and be partially cleared, leaving only enough information to
3395	* recognize the remote port relative to the scsi target id binding if
3396	* it later appears. The port will remain as long as there is a valid
3397	* binding (e.g. until the user changes the binding type or unloads the
3398	* scsi host with the binding).
3399	*
3400	* If the remote port returns within the dev_loss_tmo value (and matches
3401	* according to the target id binding type), the port structure will be
3402	* reused. If it is no longer a SCSI target, the target will be torn
3403	* down. If it continues to be a SCSI target, then the target will be
3404	* unblocked (allowing i/o to be resumed), and a scan will be activated
3405	* to ensure that all luns are detected.
3406	*
3407	* Called from normal process context only - cannot be called from interrupt.
3408	*
3409	* Notes:
3410	* This routine assumes no locks are held on entry.
3411	*/
3412	void
3413	fc_remote_port_delete(struct fc_rport *rport)
3414	{
3415	struct Scsi_Host *shost = rport_to_shost(rport);
3416	unsigned long timeout = rport->dev_loss_tmo;
3417	unsigned long flags;
3418
3419	/*
3420	* No need to flush the fc_host work_q's, as all adds are synchronous.
3421	*
3422	* We do need to reclaim the rport scan work element, so eventually
3423	* (in fc_rport_final_delete()) we'll flush the scsi host work_q if
3424	* there's still a scan pending.
3425	*/
3426
3427	spin_lock_irqsave(shost->host_lock, flags);
3428
3429	if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3430	(rport->port_state != FC_PORTSTATE_MARGINAL)) {
3431	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3432	return;
3433	}
3434
3435	/*
3436	* In the past, we if this was not an FCP-Target, we would
3437	* unconditionally just jump to deleting the rport.
3438	* However, rports can be used as node containers by the LLDD,
3439	* and its not appropriate to just terminate the rport at the
3440	* first sign of a loss in connectivity. The LLDD may want to
3441	* send ELS traffic to re-validate the login. If the rport is
3442	* immediately deleted, it makes it inappropriate for a node
3443	* container.
3444	* So... we now unconditionally wait dev_loss_tmo before
3445	* destroying an rport.
3446	*/
3447
3448	rport->port_state = FC_PORTSTATE_BLOCKED;
3449
3450	rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3451
3452	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3453
3454	scsi_block_targets(shost, dev: &rport->dev);
3455
3456	/* see if we need to kill io faster than waiting for device loss */
3457	if ((rport->fast_io_fail_tmo != -1) &&
3458	(rport->fast_io_fail_tmo < timeout))
3459	fc_queue_devloss_work(shost, work: &rport->fail_io_work,
3460	delay: rport->fast_io_fail_tmo * HZ);
3461
3462	/* cap the length the devices can be blocked until they are deleted */
3463	fc_queue_devloss_work(shost, work: &rport->dev_loss_work, delay: timeout * HZ);
3464	}
3465	EXPORT_SYMBOL(fc_remote_port_delete);
3466
3467	/**
3468	* fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3469	* @rport: The remote port that changed.
3470	* @roles: New roles for this port.
3471	*
3472	* Description: The LLDD calls this routine to notify the transport that the
3473	* roles on a remote port may have changed. The largest effect of this is
3474	* if a port now becomes a FCP Target, it must be allocated a
3475	* scsi target id. If the port is no longer a FCP target, any
3476	* scsi target id value assigned to it will persist in case the
3477	* role changes back to include FCP Target. No changes in the scsi
3478	* midlayer will be invoked if the role changes (in the expectation
3479	* that the role will be resumed. If it doesn't normal error processing
3480	* will take place).
3481	*
3482	* Should not be called from interrupt context.
3483	*
3484	* Notes:
3485	* This routine assumes no locks are held on entry.
3486	*/
3487	void
3488	fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
3489	{
3490	struct Scsi_Host *shost = rport_to_shost(rport);
3491	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3492	unsigned long flags;
3493	int create = 0;
3494
3495	spin_lock_irqsave(shost->host_lock, flags);
3496	if (roles & FC_PORT_ROLE_FCP_TARGET) {
3497	if (rport->scsi_target_id == -1) {
3498	rport->scsi_target_id = fc_host->next_target_id++;
3499	create = 1;
3500	} else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3501	create = 1;
3502	}
3503
3504	rport->roles = roles;
3505
3506	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3507
3508	if (create) {
3509	/*
3510	* There may have been a delete timer running on the
3511	* port. Ensure that it is cancelled as we now know
3512	* the port is an FCP Target.
3513	* Note: we know the rport exists and is in an online
3514	* state as the LLDD would not have had an rport
3515	* reference to pass us.
3516	*
3517	* Take no action on the del_timer failure as the state
3518	* machine state change will validate the
3519	* transaction.
3520	*/
3521	if (!cancel_delayed_work(dwork: &rport->fail_io_work))
3522	fc_flush_devloss(shost);
3523	if (!cancel_delayed_work(dwork: &rport->dev_loss_work))
3524	fc_flush_devloss(shost);
3525
3526	spin_lock_irqsave(shost->host_lock, flags);
3527	rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3528	FC_RPORT_DEVLOSS_PENDING |
3529	FC_RPORT_DEVLOSS_CALLBK_DONE);
3530	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3531
3532	/* ensure any stgt delete functions are done */
3533	fc_flush_work(shost);
3534
3535	scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3536	/* initiate a scan of the target */
3537	spin_lock_irqsave(shost->host_lock, flags);
3538	rport->flags |= FC_RPORT_SCAN_PENDING;
3539	scsi_queue_work(shost, &rport->scan_work);
3540	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3541	}
3542	}
3543	EXPORT_SYMBOL(fc_remote_port_rolechg);
3544
3545	/**
3546	* fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3547	* @work: rport target that failed to reappear in the allotted time.
3548	*
3549	* Description: An attempt to delete a remote port blocks, and if it fails
3550	* to return in the allotted time this gets called.
3551	*/
3552	static void
3553	fc_timeout_deleted_rport(struct work_struct *work)
3554	{
3555	struct fc_rport *rport =
3556	container_of(work, struct fc_rport, dev_loss_work.work);
3557	struct Scsi_Host *shost = rport_to_shost(rport);
3558	struct fc_internal *i = to_fc_internal(shost->transportt);
3559	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3560	unsigned long flags;
3561	int do_callback = 0;
3562
3563	spin_lock_irqsave(shost->host_lock, flags);
3564
3565	rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3566
3567	/*
3568	* If the port is ONLINE, then it came back. If it was a SCSI
3569	* target, validate it still is. If not, tear down the
3570	* scsi_target on it.
3571	*/
3572	if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3573	(rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3574	(rport->scsi_target_id != -1) &&
3575	!(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3576	dev_printk(KERN_ERR, &rport->dev,
3577	"blocked FC remote port time out: no longer"
3578	" a FCP target, removing starget\n");
3579	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3580	scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3581	fc_queue_work(shost, work: &rport->stgt_delete_work);
3582	return;
3583	}
3584
3585	/* NOOP state - we're flushing workq's */
3586	if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3587	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3588	dev_printk(KERN_ERR, &rport->dev,
3589	"blocked FC remote port time out: leaving"
3590	" rport%s alone\n",
3591	(rport->scsi_target_id != -1) ? " and starget" : "");
3592	return;
3593	}
3594
3595	if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3596	(rport->scsi_target_id == -1)) {
3597	list_del(entry: &rport->peers);
3598	rport->port_state = FC_PORTSTATE_DELETED;
3599	dev_printk(KERN_ERR, &rport->dev,
3600	"blocked FC remote port time out: removing"
3601	" rport%s\n",
3602	(rport->scsi_target_id != -1) ? " and starget" : "");
3603	fc_queue_work(shost, work: &rport->rport_delete_work);
3604	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3605	return;
3606	}
3607
3608	dev_printk(KERN_ERR, &rport->dev,
3609	"blocked FC remote port time out: removing target and "
3610	"saving binding\n");
3611
3612	list_move_tail(list: &rport->peers, head: &fc_host->rport_bindings);
3613
3614	/*
3615	* Note: We do not remove or clear the hostdata area. This allows
3616	* host-specific target data to persist along with the
3617	* scsi_target_id. It's up to the host to manage it's hostdata area.
3618	*/
3619
3620	/*
3621	* Reinitialize port attributes that may change if the port comes back.
3622	*/
3623	rport->maxframe_size = -1;
3624	rport->supported_classes = FC_COS_UNSPECIFIED;
3625	rport->roles = FC_PORT_ROLE_UNKNOWN;
3626	rport->port_state = FC_PORTSTATE_NOTPRESENT;
3627	rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3628
3629	/*
3630	* Pre-emptively kill I/O rather than waiting for the work queue
3631	* item to teardown the starget. (FCOE libFC folks prefer this
3632	* and to have the rport_port_id still set when it's done).
3633	*/
3634	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3635	fc_terminate_rport_io(rport);
3636
3637	spin_lock_irqsave(shost->host_lock, flags);
3638
3639	if (rport->port_state == FC_PORTSTATE_NOTPRESENT) { /* still missing */
3640
3641	/* remove the identifiers that aren't used in the consisting binding */
3642	switch (fc_host->tgtid_bind_type) {
3643	case FC_TGTID_BIND_BY_WWPN:
3644	rport->node_name = -1;
3645	rport->port_id = -1;
3646	break;
3647	case FC_TGTID_BIND_BY_WWNN:
3648	rport->port_name = -1;
3649	rport->port_id = -1;
3650	break;
3651	case FC_TGTID_BIND_BY_ID:
3652	rport->node_name = -1;
3653	rport->port_name = -1;
3654	break;
3655	case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3656	break;
3657	}
3658
3659	/*
3660	* As this only occurs if the remote port (scsi target)
3661	* went away and didn't come back - we'll remove
3662	* all attached scsi devices.
3663	*/
3664	rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3665	fc_queue_work(shost, work: &rport->stgt_delete_work);
3666
3667	do_callback = 1;
3668	}
3669
3670	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3671
3672	/*
3673	* Notify the driver that the rport is now dead. The LLDD will
3674	* also guarantee that any communication to the rport is terminated
3675	*
3676	* Note: we set the CALLBK_DONE flag above to correspond
3677	*/
3678	if (do_callback && i->f->dev_loss_tmo_callbk)
3679	i->f->dev_loss_tmo_callbk(rport);
3680	}
3681
3682
3683	/**
3684	* fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3685	* @work: rport to terminate io on.
3686	*
3687	* Notes: Only requests the failure of the io, not that all are flushed
3688	* prior to returning.
3689	*/
3690	static void
3691	fc_timeout_fail_rport_io(struct work_struct *work)
3692	{
3693	struct fc_rport *rport =
3694	container_of(work, struct fc_rport, fail_io_work.work);
3695
3696	if (rport->port_state != FC_PORTSTATE_BLOCKED)
3697	return;
3698
3699	rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3700	fc_terminate_rport_io(rport);
3701	}
3702
3703	/**
3704	* fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3705	* @work: remote port to be scanned.
3706	*/
3707	static void
3708	fc_scsi_scan_rport(struct work_struct *work)
3709	{
3710	struct fc_rport *rport =
3711	container_of(work, struct fc_rport, scan_work);
3712	struct Scsi_Host *shost = rport_to_shost(rport);
3713	struct fc_internal *i = to_fc_internal(shost->transportt);
3714	unsigned long flags;
3715
3716	if (((rport->port_state == FC_PORTSTATE_ONLINE) ||
3717	(rport->port_state == FC_PORTSTATE_MARGINAL)) &&
3718	(rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3719	!(i->f->disable_target_scan)) {
3720	scsi_scan_target(parent: &rport->dev, channel: rport->channel,
3721	id: rport->scsi_target_id, SCAN_WILD_CARD,
3722	rescan: SCSI_SCAN_RESCAN);
3723	}
3724
3725	spin_lock_irqsave(shost->host_lock, flags);
3726	rport->flags &= ~FC_RPORT_SCAN_PENDING;
3727	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3728	}
3729
3730	/**
3731	* fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3732	* @rport: Remote port that scsi_eh is trying to recover.
3733	*
3734	* This routine can be called from a FC LLD scsi_eh callback. It
3735	* blocks the scsi_eh thread until the fc_rport leaves the
3736	* FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3737	* necessary to avoid the scsi_eh failing recovery actions for blocked
3738	* rports which would lead to offlined SCSI devices.
3739	*
3740	* Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3741	* FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3742	* passed back to scsi_eh.
3743	*/
3744	int fc_block_rport(struct fc_rport *rport)
3745	{
3746	struct Scsi_Host *shost = rport_to_shost(rport);
3747	unsigned long flags;
3748
3749	spin_lock_irqsave(shost->host_lock, flags);
3750	while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3751	!(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3752	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3753	msleep(msecs: 1000);
3754	spin_lock_irqsave(shost->host_lock, flags);
3755	}
3756	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3757
3758	if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3759	return FAST_IO_FAIL;
3760
3761	return 0;
3762	}
3763	EXPORT_SYMBOL(fc_block_rport);
3764
3765	/**
3766	* fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3767	* @cmnd: SCSI command that scsi_eh is trying to recover
3768	*
3769	* This routine can be called from a FC LLD scsi_eh callback. It
3770	* blocks the scsi_eh thread until the fc_rport leaves the
3771	* FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3772	* necessary to avoid the scsi_eh failing recovery actions for blocked
3773	* rports which would lead to offlined SCSI devices.
3774	*
3775	* Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3776	* FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3777	* passed back to scsi_eh.
3778	*/
3779	int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3780	{
3781	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3782
3783	if (WARN_ON_ONCE(!rport))
3784	return FAST_IO_FAIL;
3785
3786	return fc_block_rport(rport);
3787	}
3788	EXPORT_SYMBOL(fc_block_scsi_eh);
3789
3790	/*
3791	* fc_eh_should_retry_cmd - Checks if the cmd should be retried or not
3792	* @scmd: The SCSI command to be checked
3793	*
3794	* This checks the rport state to decide if a cmd is
3795	* retryable.
3796	*
3797	* Returns: true if the rport state is not in marginal state.
3798	*/
3799	bool fc_eh_should_retry_cmd(struct scsi_cmnd *scmd)
3800	{
3801	struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
3802
3803	if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
3804	(scsi_cmd_to_rq(scmd)->cmd_flags & REQ_FAILFAST_TRANSPORT)) {
3805	set_host_byte(cmd: scmd, status: DID_TRANSPORT_MARGINAL);
3806	return false;
3807	}
3808	return true;
3809	}
3810	EXPORT_SYMBOL_GPL(fc_eh_should_retry_cmd);
3811
3812	/**
3813	* fc_vport_setup - allocates and creates a FC virtual port.
3814	* @shost: scsi host the virtual port is connected to.
3815	* @channel: Channel on shost port connected to.
3816	* @pdev: parent device for vport
3817	* @ids: The world wide names, FC4 port roles, etc for
3818	* the virtual port.
3819	* @ret_vport: The pointer to the created vport.
3820	*
3821	* Allocates and creates the vport structure, calls the parent host
3822	* to instantiate the vport, this completes w/ class and sysfs creation.
3823	*
3824	* Notes:
3825	* This routine assumes no locks are held on entry.
3826	*/
3827	static int
3828	fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3829	struct fc_vport_identifiers *ids, struct fc_vport **ret_vport)
3830	{
3831	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3832	struct fc_internal *fci = to_fc_internal(shost->transportt);
3833	struct fc_vport *vport;
3834	struct device *dev;
3835	unsigned long flags;
3836	size_t size;
3837	int error;
3838
3839	*ret_vport = NULL;
3840
3841	if ( ! fci->f->vport_create)
3842	return -ENOENT;
3843
3844	size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3845	vport = kzalloc(size, GFP_KERNEL);
3846	if (unlikely(!vport)) {
3847	printk(KERN_ERR "%s: allocation failure\n", __func__);
3848	return -ENOMEM;
3849	}
3850
3851	vport->vport_state = FC_VPORT_UNKNOWN;
3852	vport->vport_last_state = FC_VPORT_UNKNOWN;
3853	vport->node_name = ids->node_name;
3854	vport->port_name = ids->port_name;
3855	vport->roles = ids->roles;
3856	vport->vport_type = ids->vport_type;
3857	if (fci->f->dd_fcvport_size)
3858	vport->dd_data = &vport[1];
3859	vport->shost = shost;
3860	vport->channel = channel;
3861	vport->flags = FC_VPORT_CREATING;
3862	INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3863
3864	spin_lock_irqsave(shost->host_lock, flags);
3865
3866	if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3867	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3868	kfree(objp: vport);
3869	return -ENOSPC;
3870	}
3871	fc_host->npiv_vports_inuse++;
3872	vport->number = fc_host->next_vport_number++;
3873	list_add_tail(new: &vport->peers, head: &fc_host->vports);
3874	scsi_host_get(shost); /* for fc_host->vport list */
3875
3876	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3877
3878	dev = &vport->dev;
3879	device_initialize(dev); /* takes self reference */
3880	dev->parent = get_device(dev: pdev); /* takes parent reference */
3881	dev->release = fc_vport_dev_release;
3882	dev_set_name(dev, name: "vport-%d:%d-%d",
3883	shost->host_no, channel, vport->number);
3884	transport_setup_device(dev);
3885
3886	error = device_add(dev);
3887	if (error) {
3888	printk(KERN_ERR "FC Virtual Port device_add failed\n");
3889	goto delete_vport;
3890	}
3891	transport_add_device(dev);
3892	transport_configure_device(dev);
3893
3894	error = fci->f->vport_create(vport, ids->disable);
3895	if (error) {
3896	printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3897	goto delete_vport_all;
3898	}
3899
3900	/*
3901	* if the parent isn't the physical adapter's Scsi_Host, ensure
3902	* the Scsi_Host at least contains a symlink to the vport.
3903	*/
3904	if (pdev != &shost->shost_gendev) {
3905	error = sysfs_create_link(kobj: &shost->shost_gendev.kobj,
3906	target: &dev->kobj, name: dev_name(dev));
3907	if (error)
3908	printk(KERN_ERR
3909	"%s: Cannot create vport symlinks for "
3910	"%s, err=%d\n",
3911	__func__, dev_name(dev), error);
3912	}
3913	spin_lock_irqsave(shost->host_lock, flags);
3914	vport->flags &= ~FC_VPORT_CREATING;
3915	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3916
3917	dev_printk(KERN_NOTICE, pdev,
3918	"%s created via shost%d channel %d\n", dev_name(dev),
3919	shost->host_no, channel);
3920
3921	*ret_vport = vport;
3922
3923	return 0;
3924
3925	delete_vport_all:
3926	transport_remove_device(dev);
3927	device_del(dev);
3928	delete_vport:
3929	transport_destroy_device(dev);
3930	spin_lock_irqsave(shost->host_lock, flags);
3931	list_del(entry: &vport->peers);
3932	scsi_host_put(t: shost); /* for fc_host->vport list */
3933	fc_host->npiv_vports_inuse--;
3934	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3935	put_device(dev: dev->parent);
3936	kfree(objp: vport);
3937
3938	return error;
3939	}
3940
3941	/**
3942	* fc_vport_create - Admin App or LLDD requests creation of a vport
3943	* @shost: scsi host the virtual port is connected to.
3944	* @channel: channel on shost port connected to.
3945	* @ids: The world wide names, FC4 port roles, etc for
3946	* the virtual port.
3947	*
3948	* Notes:
3949	* This routine assumes no locks are held on entry.
3950	*/
3951	struct fc_vport *
3952	fc_vport_create(struct Scsi_Host *shost, int channel,
3953	struct fc_vport_identifiers *ids)
3954	{
3955	int stat;
3956	struct fc_vport *vport;
3957
3958	stat = fc_vport_setup(shost, channel, pdev: &shost->shost_gendev,
3959	ids, ret_vport: &vport);
3960	return stat ? NULL : vport;
3961	}
3962	EXPORT_SYMBOL(fc_vport_create);
3963
3964	/**
3965	* fc_vport_terminate - Admin App or LLDD requests termination of a vport
3966	* @vport: fc_vport to be terminated
3967	*
3968	* Calls the LLDD vport_delete() function, then deallocates and removes
3969	* the vport from the shost and object tree.
3970	*
3971	* Notes:
3972	* This routine assumes no locks are held on entry.
3973	*/
3974	int
3975	fc_vport_terminate(struct fc_vport *vport)
3976	{
3977	struct Scsi_Host *shost = vport_to_shost(vport);
3978	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3979	struct fc_internal *i = to_fc_internal(shost->transportt);
3980	struct device *dev = &vport->dev;
3981	unsigned long flags;
3982	int stat;
3983
3984	if (i->f->vport_delete)
3985	stat = i->f->vport_delete(vport);
3986	else
3987	stat = -ENOENT;
3988
3989	spin_lock_irqsave(shost->host_lock, flags);
3990	vport->flags &= ~FC_VPORT_DELETING;
3991	if (!stat) {
3992	vport->flags |= FC_VPORT_DELETED;
3993	list_del(entry: &vport->peers);
3994	fc_host->npiv_vports_inuse--;
3995	scsi_host_put(t: shost); /* for fc_host->vport list */
3996	}
3997	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3998
3999	if (stat)
4000	return stat;
4001
4002	if (dev->parent != &shost->shost_gendev)
4003	sysfs_remove_link(kobj: &shost->shost_gendev.kobj, name: dev_name(dev));
4004	transport_remove_device(dev);
4005	device_del(dev);
4006	transport_destroy_device(dev);
4007
4008	/*
4009	* Removing our self-reference should mean our
4010	* release function gets called, which will drop the remaining
4011	* parent reference and free the data structure.
4012	*/
4013	put_device(dev); /* for self-reference */
4014
4015	return 0; /* SUCCESS */
4016	}
4017	EXPORT_SYMBOL(fc_vport_terminate);
4018
4019	/**
4020	* fc_vport_sched_delete - workq-based delete request for a vport
4021	* @work: vport to be deleted.
4022	*/
4023	static void
4024	fc_vport_sched_delete(struct work_struct *work)
4025	{
4026	struct fc_vport *vport =
4027	container_of(work, struct fc_vport, vport_delete_work);
4028	int stat;
4029
4030	stat = fc_vport_terminate(vport);
4031	if (stat)
4032	dev_printk(KERN_ERR, vport->dev.parent,
4033	"%s: %s could not be deleted created via "
4034	"shost%d channel %d - error %d\n", __func__,
4035	dev_name(&vport->dev), vport->shost->host_no,
4036	vport->channel, stat);
4037	}
4038
4039
4040	/*
4041	* BSG support
4042	*/
4043
4044	/**
4045	* fc_bsg_job_timeout - handler for when a bsg request timesout
4046	* @req: request that timed out
4047	*/
4048	static enum blk_eh_timer_return
4049	fc_bsg_job_timeout(struct request *req)
4050	{
4051	struct bsg_job *job = blk_mq_rq_to_pdu(rq: req);
4052	struct Scsi_Host *shost = fc_bsg_to_shost(job);
4053	struct fc_rport *rport = fc_bsg_to_rport(job);
4054	struct fc_internal *i = to_fc_internal(shost->transportt);
4055	int err = 0, inflight = 0;
4056
4057	if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
4058	return BLK_EH_RESET_TIMER;
4059
4060	inflight = bsg_job_get(job);
4061
4062	if (inflight && i->f->bsg_timeout) {
4063	/* call LLDD to abort the i/o as it has timed out */
4064	err = i->f->bsg_timeout(job);
4065	if (err == -EAGAIN) {
4066	bsg_job_put(job);
4067	return BLK_EH_RESET_TIMER;
4068	} else if (err)
4069	printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
4070	"abort failed with status %d\n", err);
4071	}
4072
4073	/* the blk_end_sync_io() doesn't check the error */
4074	if (inflight)
4075	blk_mq_end_request(rq: req, BLK_STS_IOERR);
4076	return BLK_EH_DONE;
4077	}
4078
4079	/**
4080	* fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
4081	* @shost: scsi host rport attached to
4082	* @job: bsg job to be processed
4083	*/
4084	static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4085	{
4086	struct fc_internal *i = to_fc_internal(shost->transportt);
4087	struct fc_bsg_request *bsg_request = job->request;
4088	struct fc_bsg_reply *bsg_reply = job->reply;
4089	int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4090	int ret;
4091
4092	/* check if we really have all the request data needed */
4093	if (job->request_len < cmdlen) {
4094	ret = -ENOMSG;
4095	goto fail_host_msg;
4096	}
4097
4098	/* Validate the host command */
4099	switch (bsg_request->msgcode) {
4100	case FC_BSG_HST_ADD_RPORT:
4101	cmdlen += sizeof(struct fc_bsg_host_add_rport);
4102	break;
4103
4104	case FC_BSG_HST_DEL_RPORT:
4105	cmdlen += sizeof(struct fc_bsg_host_del_rport);
4106	break;
4107
4108	case FC_BSG_HST_ELS_NOLOGIN:
4109	cmdlen += sizeof(struct fc_bsg_host_els);
4110	/* there better be a xmt and rcv payloads */
4111	if ((!job->request_payload.payload_len) ||
4112	(!job->reply_payload.payload_len)) {
4113	ret = -EINVAL;
4114	goto fail_host_msg;
4115	}
4116	break;
4117
4118	case FC_BSG_HST_CT:
4119	cmdlen += sizeof(struct fc_bsg_host_ct);
4120	/* there better be xmt and rcv payloads */
4121	if ((!job->request_payload.payload_len) ||
4122	(!job->reply_payload.payload_len)) {
4123	ret = -EINVAL;
4124	goto fail_host_msg;
4125	}
4126	break;
4127
4128	case FC_BSG_HST_VENDOR:
4129	cmdlen += sizeof(struct fc_bsg_host_vendor);
4130	if ((shost->hostt->vendor_id == 0L) ||
4131	(bsg_request->rqst_data.h_vendor.vendor_id !=
4132	shost->hostt->vendor_id)) {
4133	ret = -ESRCH;
4134	goto fail_host_msg;
4135	}
4136	break;
4137
4138	default:
4139	ret = -EBADR;
4140	goto fail_host_msg;
4141	}
4142
4143	ret = i->f->bsg_request(job);
4144	if (!ret)
4145	return 0;
4146
4147	fail_host_msg:
4148	/* return the errno failure code as the only status */
4149	BUG_ON(job->reply_len < sizeof(uint32_t));
4150	bsg_reply->reply_payload_rcv_len = 0;
4151	bsg_reply->result = ret;
4152	job->reply_len = sizeof(uint32_t);
4153	bsg_job_done(job, result: bsg_reply->result,
4154	reply_payload_rcv_len: bsg_reply->reply_payload_rcv_len);
4155	return 0;
4156	}
4157
4158
4159	/*
4160	* fc_bsg_goose_queue - restart rport queue in case it was stopped
4161	* @rport: rport to be restarted
4162	*/
4163	static void
4164	fc_bsg_goose_queue(struct fc_rport *rport)
4165	{
4166	struct request_queue *q = rport->rqst_q;
4167
4168	if (q)
4169	blk_mq_run_hw_queues(q, async: true);
4170	}
4171
4172	/**
4173	* fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
4174	* @shost: scsi host rport attached to
4175	* @job: bsg job to be processed
4176	*/
4177	static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4178	{
4179	struct fc_internal *i = to_fc_internal(shost->transportt);
4180	struct fc_bsg_request *bsg_request = job->request;
4181	struct fc_bsg_reply *bsg_reply = job->reply;
4182	int cmdlen = sizeof(uint32_t); /* start with length of msgcode */
4183	int ret;
4184
4185	/* check if we really have all the request data needed */
4186	if (job->request_len < cmdlen) {
4187	ret = -ENOMSG;
4188	goto fail_rport_msg;
4189	}
4190
4191	/* Validate the rport command */
4192	switch (bsg_request->msgcode) {
4193	case FC_BSG_RPT_ELS:
4194	cmdlen += sizeof(struct fc_bsg_rport_els);
4195	goto check_bidi;
4196
4197	case FC_BSG_RPT_CT:
4198	cmdlen += sizeof(struct fc_bsg_rport_ct);
4199	check_bidi:
4200	/* there better be xmt and rcv payloads */
4201	if ((!job->request_payload.payload_len) ||
4202	(!job->reply_payload.payload_len)) {
4203	ret = -EINVAL;
4204	goto fail_rport_msg;
4205	}
4206	break;
4207	default:
4208	ret = -EBADR;
4209	goto fail_rport_msg;
4210	}
4211
4212	ret = i->f->bsg_request(job);
4213	if (!ret)
4214	return 0;
4215
4216	fail_rport_msg:
4217	/* return the errno failure code as the only status */
4218	BUG_ON(job->reply_len < sizeof(uint32_t));
4219	bsg_reply->reply_payload_rcv_len = 0;
4220	bsg_reply->result = ret;
4221	job->reply_len = sizeof(uint32_t);
4222	bsg_job_done(job, result: bsg_reply->result,
4223	reply_payload_rcv_len: bsg_reply->reply_payload_rcv_len);
4224	return 0;
4225	}
4226
4227	static int fc_bsg_dispatch(struct bsg_job *job)
4228	{
4229	struct Scsi_Host *shost = fc_bsg_to_shost(job);
4230
4231	if (scsi_is_fc_rport(job->dev))
4232	return fc_bsg_rport_dispatch(shost, job);
4233	else
4234	return fc_bsg_host_dispatch(shost, job);
4235	}
4236
4237	static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
4238	{
4239	if (rport->port_state == FC_PORTSTATE_BLOCKED &&
4240	!(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
4241	return BLK_STS_RESOURCE;
4242
4243	if ((rport->port_state != FC_PORTSTATE_ONLINE) &&
4244	(rport->port_state != FC_PORTSTATE_MARGINAL))
4245	return BLK_STS_IOERR;
4246
4247	return BLK_STS_OK;
4248	}
4249
4250
4251	static int fc_bsg_dispatch_prep(struct bsg_job *job)
4252	{
4253	struct fc_rport *rport = fc_bsg_to_rport(job);
4254	blk_status_t ret;
4255
4256	ret = fc_bsg_rport_prep(rport);
4257	switch (ret) {
4258	case BLK_STS_OK:
4259	break;
4260	case BLK_STS_RESOURCE:
4261	return -EAGAIN;
4262	default:
4263	return -EIO;
4264	}
4265
4266	return fc_bsg_dispatch(job);
4267	}
4268
4269	/**
4270	* fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4271	* @shost: shost for fc_host
4272	* @fc_host: fc_host adding the structures to
4273	*/
4274	static int
4275	fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4276	{
4277	struct device *dev = &shost->shost_gendev;
4278	struct fc_internal *i = to_fc_internal(shost->transportt);
4279	struct request_queue *q;
4280	char bsg_name[20];
4281
4282	fc_host->rqst_q = NULL;
4283
4284	if (!i->f->bsg_request)
4285	return -ENOTSUPP;
4286
4287	snprintf(buf: bsg_name, size: sizeof(bsg_name),
4288	fmt: "fc_host%d", shost->host_no);
4289
4290	q = bsg_setup_queue(dev, name: bsg_name, job_fn: fc_bsg_dispatch, timeout: fc_bsg_job_timeout,
4291	dd_job_size: i->f->dd_bsg_size);
4292	if (IS_ERR(ptr: q)) {
4293	dev_err(dev,
4294	"fc_host%d: bsg interface failed to initialize - setup queue\n",
4295	shost->host_no);
4296	return PTR_ERR(ptr: q);
4297	}
4298	__scsi_init_queue(shost, q);
4299	blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4300	fc_host->rqst_q = q;
4301	return 0;
4302	}
4303
4304	/**
4305	* fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4306	* @shost: shost that rport is attached to
4307	* @rport: rport that the bsg hooks are being attached to
4308	*/
4309	static int
4310	fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4311	{
4312	struct device *dev = &rport->dev;
4313	struct fc_internal *i = to_fc_internal(shost->transportt);
4314	struct request_queue *q;
4315
4316	rport->rqst_q = NULL;
4317
4318	if (!i->f->bsg_request)
4319	return -ENOTSUPP;
4320
4321	q = bsg_setup_queue(dev, name: dev_name(dev), job_fn: fc_bsg_dispatch_prep,
4322	timeout: fc_bsg_job_timeout, dd_job_size: i->f->dd_bsg_size);
4323	if (IS_ERR(ptr: q)) {
4324	dev_err(dev, "failed to setup bsg queue\n");
4325	return PTR_ERR(ptr: q);
4326	}
4327	__scsi_init_queue(shost, q);
4328	blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4329	rport->rqst_q = q;
4330	return 0;
4331	}
4332
4333
4334	/**
4335	* fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4336	* @q: the request_queue that is to be torn down.
4337	*
4338	* Notes:
4339	* Before unregistering the queue empty any requests that are blocked
4340	*
4341	*
4342	*/
4343	static void
4344	fc_bsg_remove(struct request_queue *q)
4345	{
4346	bsg_remove_queue(q);
4347	}
4348
4349
4350	/* Original Author: Martin Hicks */
4351	MODULE_AUTHOR("James Smart");
4352	MODULE_DESCRIPTION("FC Transport Attributes");
4353	MODULE_LICENSE("GPL");
4354
4355	module_init(fc_transport_init);
4356	module_exit(fc_transport_exit);
4357