653f22a8deb9f7ee829667e72e45352f22ea00ea
[linux-2.6.git] / drivers / scsi / scsi_transport_fc.c
1 /*
2  *  FiberChannel transport specific attributes exported to sysfs.
3  *
4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
5  *
6  *  This program is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License as published by
8  *  the Free Software Foundation; either version 2 of the License, or
9  *  (at your option) any later version.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
19  *
20  *  ========
21  *
22  *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
23  *    Rewrite for host, target, device, and remote port attributes,
24  *    statistics, and service functions...
25  *    Add vports, etc
26  *
27  */
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/delay.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_host.h>
33 #include <scsi/scsi_transport.h>
34 #include <scsi/scsi_transport_fc.h>
35 #include <scsi/scsi_cmnd.h>
36 #include <linux/netlink.h>
37 #include <net/netlink.h>
38 #include <scsi/scsi_netlink_fc.h>
39 #include <scsi/scsi_bsg_fc.h>
40 #include "scsi_priv.h"
41 #include "scsi_transport_fc_internal.h"
42
43 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
44 static void fc_vport_sched_delete(struct work_struct *work);
45 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
46         struct device *pdev, struct fc_vport_identifiers  *ids,
47         struct fc_vport **vport);
48 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
49 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
50 static void fc_bsg_remove(struct request_queue *);
51 static void fc_bsg_goose_queue(struct fc_rport *);
52
53 /*
54  * Redefine so that we can have same named attributes in the
55  * sdev/starget/host objects.
56  */
57 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
58 struct device_attribute device_attr_##_prefix##_##_name =       \
59         __ATTR(_name,_mode,_show,_store)
60
61 #define fc_enum_name_search(title, table_type, table)                   \
62 static const char *get_fc_##title##_name(enum table_type table_key)     \
63 {                                                                       \
64         int i;                                                          \
65         char *name = NULL;                                              \
66                                                                         \
67         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
68                 if (table[i].value == table_key) {                      \
69                         name = table[i].name;                           \
70                         break;                                          \
71                 }                                                       \
72         }                                                               \
73         return name;                                                    \
74 }
75
76 #define fc_enum_name_match(title, table_type, table)                    \
77 static int get_fc_##title##_match(const char *table_key,                \
78                 enum table_type *value)                                 \
79 {                                                                       \
80         int i;                                                          \
81                                                                         \
82         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
83                 if (strncmp(table_key, table[i].name,                   \
84                                 table[i].matchlen) == 0) {              \
85                         *value = table[i].value;                        \
86                         return 0; /* success */                         \
87                 }                                                       \
88         }                                                               \
89         return 1; /* failure */                                         \
90 }
91
92
93 /* Convert fc_port_type values to ascii string name */
94 static struct {
95         enum fc_port_type       value;
96         char                    *name;
97 } fc_port_type_names[] = {
98         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
99         { FC_PORTTYPE_OTHER,            "Other" },
100         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
101         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
102         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
103         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
104         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
105         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
106 };
107 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
108 #define FC_PORTTYPE_MAX_NAMELEN         50
109
110 /* Reuse fc_port_type enum function for vport_type */
111 #define get_fc_vport_type_name get_fc_port_type_name
112
113
114 /* Convert fc_host_event_code values to ascii string name */
115 static const struct {
116         enum fc_host_event_code         value;
117         char                            *name;
118 } fc_host_event_code_names[] = {
119         { FCH_EVT_LIP,                  "lip" },
120         { FCH_EVT_LINKUP,               "link_up" },
121         { FCH_EVT_LINKDOWN,             "link_down" },
122         { FCH_EVT_LIPRESET,             "lip_reset" },
123         { FCH_EVT_RSCN,                 "rscn" },
124         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
125         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
126         { FCH_EVT_PORT_ONLINE,          "port_online" },
127         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
128         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
129         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
130         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
131 };
132 fc_enum_name_search(host_event_code, fc_host_event_code,
133                 fc_host_event_code_names)
134 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
135
136
137 /* Convert fc_port_state values to ascii string name */
138 static struct {
139         enum fc_port_state      value;
140         char                    *name;
141 } fc_port_state_names[] = {
142         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
143         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
144         { FC_PORTSTATE_ONLINE,          "Online" },
145         { FC_PORTSTATE_OFFLINE,         "Offline" },
146         { FC_PORTSTATE_BLOCKED,         "Blocked" },
147         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
148         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
149         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
150         { FC_PORTSTATE_ERROR,           "Error" },
151         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
152         { FC_PORTSTATE_DELETED,         "Deleted" },
153 };
154 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
155 #define FC_PORTSTATE_MAX_NAMELEN        20
156
157
158 /* Convert fc_vport_state values to ascii string name */
159 static struct {
160         enum fc_vport_state     value;
161         char                    *name;
162 } fc_vport_state_names[] = {
163         { FC_VPORT_UNKNOWN,             "Unknown" },
164         { FC_VPORT_ACTIVE,              "Active" },
165         { FC_VPORT_DISABLED,            "Disabled" },
166         { FC_VPORT_LINKDOWN,            "Linkdown" },
167         { FC_VPORT_INITIALIZING,        "Initializing" },
168         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
169         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
170         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
171         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
172         { FC_VPORT_FAILED,              "VPort Failed" },
173 };
174 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
175 #define FC_VPORTSTATE_MAX_NAMELEN       24
176
177 /* Reuse fc_vport_state enum function for vport_last_state */
178 #define get_fc_vport_last_state_name get_fc_vport_state_name
179
180
181 /* Convert fc_tgtid_binding_type values to ascii string name */
182 static const struct {
183         enum fc_tgtid_binding_type      value;
184         char                            *name;
185         int                             matchlen;
186 } fc_tgtid_binding_type_names[] = {
187         { FC_TGTID_BIND_NONE, "none", 4 },
188         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
189         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
190         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
191 };
192 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
193                 fc_tgtid_binding_type_names)
194 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
195                 fc_tgtid_binding_type_names)
196 #define FC_BINDTYPE_MAX_NAMELEN 30
197
198
199 #define fc_bitfield_name_search(title, table)                   \
200 static ssize_t                                                  \
201 get_fc_##title##_names(u32 table_key, char *buf)                \
202 {                                                               \
203         char *prefix = "";                                      \
204         ssize_t len = 0;                                        \
205         int i;                                                  \
206                                                                 \
207         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
208                 if (table[i].value & table_key) {               \
209                         len += sprintf(buf + len, "%s%s",       \
210                                 prefix, table[i].name);         \
211                         prefix = ", ";                          \
212                 }                                               \
213         }                                                       \
214         len += sprintf(buf + len, "\n");                        \
215         return len;                                             \
216 }
217
218
219 /* Convert FC_COS bit values to ascii string name */
220 static const struct {
221         u32                     value;
222         char                    *name;
223 } fc_cos_names[] = {
224         { FC_COS_CLASS1,        "Class 1" },
225         { FC_COS_CLASS2,        "Class 2" },
226         { FC_COS_CLASS3,        "Class 3" },
227         { FC_COS_CLASS4,        "Class 4" },
228         { FC_COS_CLASS6,        "Class 6" },
229 };
230 fc_bitfield_name_search(cos, fc_cos_names)
231
232
233 /* Convert FC_PORTSPEED bit values to ascii string name */
234 static const struct {
235         u32                     value;
236         char                    *name;
237 } fc_port_speed_names[] = {
238         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
239         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
240         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
241         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
242         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
243         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
244         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
245 };
246 fc_bitfield_name_search(port_speed, fc_port_speed_names)
247
248
249 static int
250 show_fc_fc4s (char *buf, u8 *fc4_list)
251 {
252         int i, len=0;
253
254         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
255                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
256         len += sprintf(buf + len, "\n");
257         return len;
258 }
259
260
261 /* Convert FC_PORT_ROLE bit values to ascii string name */
262 static const struct {
263         u32                     value;
264         char                    *name;
265 } fc_port_role_names[] = {
266         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
267         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
268         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
269 };
270 fc_bitfield_name_search(port_roles, fc_port_role_names)
271
272 /*
273  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
274  */
275 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
276 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
277 #define FC_FPORT_PORTID                 0x00000e
278 #define FC_FABCTLR_PORTID               0x00000d
279 #define FC_DIRSRVR_PORTID               0x00000c
280 #define FC_TIMESRVR_PORTID              0x00000b
281 #define FC_MGMTSRVR_PORTID              0x00000a
282
283
284 static void fc_timeout_deleted_rport(struct work_struct *work);
285 static void fc_timeout_fail_rport_io(struct work_struct *work);
286 static void fc_scsi_scan_rport(struct work_struct *work);
287
288 /*
289  * Attribute counts pre object type...
290  * Increase these values if you add attributes
291  */
292 #define FC_STARGET_NUM_ATTRS    3
293 #define FC_RPORT_NUM_ATTRS      10
294 #define FC_VPORT_NUM_ATTRS      9
295 #define FC_HOST_NUM_ATTRS       22
296
297 struct fc_internal {
298         struct scsi_transport_template t;
299         struct fc_function_template *f;
300
301         /*
302          * For attributes : each object has :
303          *   An array of the actual attributes structures
304          *   An array of null-terminated pointers to the attribute
305          *     structures - used for mid-layer interaction.
306          *
307          * The attribute containers for the starget and host are are
308          * part of the midlayer. As the remote port is specific to the
309          * fc transport, we must provide the attribute container.
310          */
311         struct device_attribute private_starget_attrs[
312                                                         FC_STARGET_NUM_ATTRS];
313         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
314
315         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
316         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
317
318         struct transport_container rport_attr_cont;
319         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
320         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
321
322         struct transport_container vport_attr_cont;
323         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
324         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
325 };
326
327 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
328
329 static int fc_target_setup(struct transport_container *tc, struct device *dev,
330                            struct device *cdev)
331 {
332         struct scsi_target *starget = to_scsi_target(dev);
333         struct fc_rport *rport = starget_to_rport(starget);
334
335         /*
336          * if parent is remote port, use values from remote port.
337          * Otherwise, this host uses the fc_transport, but not the
338          * remote port interface. As such, initialize to known non-values.
339          */
340         if (rport) {
341                 fc_starget_node_name(starget) = rport->node_name;
342                 fc_starget_port_name(starget) = rport->port_name;
343                 fc_starget_port_id(starget) = rport->port_id;
344         } else {
345                 fc_starget_node_name(starget) = -1;
346                 fc_starget_port_name(starget) = -1;
347                 fc_starget_port_id(starget) = -1;
348         }
349
350         return 0;
351 }
352
353 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
354                                "fc_transport",
355                                fc_target_setup,
356                                NULL,
357                                NULL);
358
359 static int fc_host_setup(struct transport_container *tc, struct device *dev,
360                          struct device *cdev)
361 {
362         struct Scsi_Host *shost = dev_to_shost(dev);
363         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
364
365         /*
366          * Set default values easily detected by the midlayer as
367          * failure cases.  The scsi lldd is responsible for initializing
368          * all transport attributes to valid values per host.
369          */
370         fc_host->node_name = -1;
371         fc_host->port_name = -1;
372         fc_host->permanent_port_name = -1;
373         fc_host->supported_classes = FC_COS_UNSPECIFIED;
374         memset(fc_host->supported_fc4s, 0,
375                 sizeof(fc_host->supported_fc4s));
376         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
377         fc_host->maxframe_size = -1;
378         fc_host->max_npiv_vports = 0;
379         memset(fc_host->serial_number, 0,
380                 sizeof(fc_host->serial_number));
381
382         fc_host->port_id = -1;
383         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
384         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
385         memset(fc_host->active_fc4s, 0,
386                 sizeof(fc_host->active_fc4s));
387         fc_host->speed = FC_PORTSPEED_UNKNOWN;
388         fc_host->fabric_name = -1;
389         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
390         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
391
392         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
393
394         INIT_LIST_HEAD(&fc_host->rports);
395         INIT_LIST_HEAD(&fc_host->rport_bindings);
396         INIT_LIST_HEAD(&fc_host->vports);
397         fc_host->next_rport_number = 0;
398         fc_host->next_target_id = 0;
399         fc_host->next_vport_number = 0;
400         fc_host->npiv_vports_inuse = 0;
401
402         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
403                  "fc_wq_%d", shost->host_no);
404         fc_host->work_q = create_singlethread_workqueue(
405                                         fc_host->work_q_name);
406         if (!fc_host->work_q)
407                 return -ENOMEM;
408
409         snprintf(fc_host->devloss_work_q_name,
410                  sizeof(fc_host->devloss_work_q_name),
411                  "fc_dl_%d", shost->host_no);
412         fc_host->devloss_work_q = create_singlethread_workqueue(
413                                         fc_host->devloss_work_q_name);
414         if (!fc_host->devloss_work_q) {
415                 destroy_workqueue(fc_host->work_q);
416                 fc_host->work_q = NULL;
417                 return -ENOMEM;
418         }
419
420         fc_bsg_hostadd(shost, fc_host);
421         /* ignore any bsg add error - we just can't do sgio */
422
423         return 0;
424 }
425
426 static int fc_host_remove(struct transport_container *tc, struct device *dev,
427                          struct device *cdev)
428 {
429         struct Scsi_Host *shost = dev_to_shost(dev);
430         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
431
432         fc_bsg_remove(fc_host->rqst_q);
433         return 0;
434 }
435
436 static DECLARE_TRANSPORT_CLASS(fc_host_class,
437                                "fc_host",
438                                fc_host_setup,
439                                fc_host_remove,
440                                NULL);
441
442 /*
443  * Setup and Remove actions for remote ports are handled
444  * in the service functions below.
445  */
446 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
447                                "fc_remote_ports",
448                                NULL,
449                                NULL,
450                                NULL);
451
452 /*
453  * Setup and Remove actions for virtual ports are handled
454  * in the service functions below.
455  */
456 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
457                                "fc_vports",
458                                NULL,
459                                NULL,
460                                NULL);
461
462 /*
463  * Module Parameters
464  */
465
466 /*
467  * dev_loss_tmo: the default number of seconds that the FC transport
468  *   should insulate the loss of a remote port.
469  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
470  */
471 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
472
473 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
474 MODULE_PARM_DESC(dev_loss_tmo,
475                  "Maximum number of seconds that the FC transport should"
476                  " insulate the loss of a remote port. Once this value is"
477                  " exceeded, the scsi target is removed. Value should be"
478                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
479
480 /*
481  * Netlink Infrastructure
482  */
483
484 static atomic_t fc_event_seq;
485
486 /**
487  * fc_get_event_number - Obtain the next sequential FC event number
488  *
489  * Notes:
490  *   We could have inlined this, but it would have required fc_event_seq to
491  *   be exposed. For now, live with the subroutine call.
492  *   Atomic used to avoid lock/unlock...
493  */
494 u32
495 fc_get_event_number(void)
496 {
497         return atomic_add_return(1, &fc_event_seq);
498 }
499 EXPORT_SYMBOL(fc_get_event_number);
500
501
502 /**
503  * fc_host_post_event - called to post an even on an fc_host.
504  * @shost:              host the event occurred on
505  * @event_number:       fc event number obtained from get_fc_event_number()
506  * @event_code:         fc_host event being posted
507  * @event_data:         32bits of data for the event being posted
508  *
509  * Notes:
510  *      This routine assumes no locks are held on entry.
511  */
512 void
513 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
514                 enum fc_host_event_code event_code, u32 event_data)
515 {
516         struct sk_buff *skb;
517         struct nlmsghdr *nlh;
518         struct fc_nl_event *event;
519         const char *name;
520         u32 len, skblen;
521         int err;
522
523         if (!scsi_nl_sock) {
524                 err = -ENOENT;
525                 goto send_fail;
526         }
527
528         len = FC_NL_MSGALIGN(sizeof(*event));
529         skblen = NLMSG_SPACE(len);
530
531         skb = alloc_skb(skblen, GFP_KERNEL);
532         if (!skb) {
533                 err = -ENOBUFS;
534                 goto send_fail;
535         }
536
537         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
538                                 skblen - sizeof(*nlh), 0);
539         if (!nlh) {
540                 err = -ENOBUFS;
541                 goto send_fail_skb;
542         }
543         event = NLMSG_DATA(nlh);
544
545         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
546                                 FC_NL_ASYNC_EVENT, len);
547         event->seconds = get_seconds();
548         event->vendor_id = 0;
549         event->host_no = shost->host_no;
550         event->event_datalen = sizeof(u32);     /* bytes */
551         event->event_num = event_number;
552         event->event_code = event_code;
553         event->event_data = event_data;
554
555         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
556                         GFP_KERNEL);
557         return;
558
559 send_fail_skb:
560         kfree_skb(skb);
561 send_fail:
562         name = get_fc_host_event_code_name(event_code);
563         printk(KERN_WARNING
564                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
565                 __func__, shost->host_no,
566                 (name) ? name : "<unknown>", event_data, err);
567         return;
568 }
569 EXPORT_SYMBOL(fc_host_post_event);
570
571
572 /**
573  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
574  * @shost:              host the event occurred on
575  * @event_number:       fc event number obtained from get_fc_event_number()
576  * @data_len:           amount, in bytes, of vendor unique data
577  * @data_buf:           pointer to vendor unique data
578  * @vendor_id:          Vendor id
579  *
580  * Notes:
581  *      This routine assumes no locks are held on entry.
582  */
583 void
584 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
585                 u32 data_len, char * data_buf, u64 vendor_id)
586 {
587         struct sk_buff *skb;
588         struct nlmsghdr *nlh;
589         struct fc_nl_event *event;
590         u32 len, skblen;
591         int err;
592
593         if (!scsi_nl_sock) {
594                 err = -ENOENT;
595                 goto send_vendor_fail;
596         }
597
598         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
599         skblen = NLMSG_SPACE(len);
600
601         skb = alloc_skb(skblen, GFP_KERNEL);
602         if (!skb) {
603                 err = -ENOBUFS;
604                 goto send_vendor_fail;
605         }
606
607         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
608                                 skblen - sizeof(*nlh), 0);
609         if (!nlh) {
610                 err = -ENOBUFS;
611                 goto send_vendor_fail_skb;
612         }
613         event = NLMSG_DATA(nlh);
614
615         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
616                                 FC_NL_ASYNC_EVENT, len);
617         event->seconds = get_seconds();
618         event->vendor_id = vendor_id;
619         event->host_no = shost->host_no;
620         event->event_datalen = data_len;        /* bytes */
621         event->event_num = event_number;
622         event->event_code = FCH_EVT_VENDOR_UNIQUE;
623         memcpy(&event->event_data, data_buf, data_len);
624
625         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
626                         GFP_KERNEL);
627         return;
628
629 send_vendor_fail_skb:
630         kfree_skb(skb);
631 send_vendor_fail:
632         printk(KERN_WARNING
633                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
634                 __func__, shost->host_no, err);
635         return;
636 }
637 EXPORT_SYMBOL(fc_host_post_vendor_event);
638
639
640
641 static __init int fc_transport_init(void)
642 {
643         int error;
644
645         atomic_set(&fc_event_seq, 0);
646
647         error = transport_class_register(&fc_host_class);
648         if (error)
649                 return error;
650         error = transport_class_register(&fc_vport_class);
651         if (error)
652                 goto unreg_host_class;
653         error = transport_class_register(&fc_rport_class);
654         if (error)
655                 goto unreg_vport_class;
656         error = transport_class_register(&fc_transport_class);
657         if (error)
658                 goto unreg_rport_class;
659         return 0;
660
661 unreg_rport_class:
662         transport_class_unregister(&fc_rport_class);
663 unreg_vport_class:
664         transport_class_unregister(&fc_vport_class);
665 unreg_host_class:
666         transport_class_unregister(&fc_host_class);
667         return error;
668 }
669
670 static void __exit fc_transport_exit(void)
671 {
672         transport_class_unregister(&fc_transport_class);
673         transport_class_unregister(&fc_rport_class);
674         transport_class_unregister(&fc_host_class);
675         transport_class_unregister(&fc_vport_class);
676 }
677
678 /*
679  * FC Remote Port Attribute Management
680  */
681
682 #define fc_rport_show_function(field, format_string, sz, cast)          \
683 static ssize_t                                                          \
684 show_fc_rport_##field (struct device *dev,                              \
685                        struct device_attribute *attr, char *buf)        \
686 {                                                                       \
687         struct fc_rport *rport = transport_class_to_rport(dev);         \
688         struct Scsi_Host *shost = rport_to_shost(rport);                \
689         struct fc_internal *i = to_fc_internal(shost->transportt);      \
690         if ((i->f->get_rport_##field) &&                                \
691             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
692               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
693               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
694                 i->f->get_rport_##field(rport);                         \
695         return snprintf(buf, sz, format_string, cast rport->field);     \
696 }
697
698 #define fc_rport_store_function(field)                                  \
699 static ssize_t                                                          \
700 store_fc_rport_##field(struct device *dev,                              \
701                        struct device_attribute *attr,                   \
702                        const char *buf, size_t count)                   \
703 {                                                                       \
704         int val;                                                        \
705         struct fc_rport *rport = transport_class_to_rport(dev);         \
706         struct Scsi_Host *shost = rport_to_shost(rport);                \
707         struct fc_internal *i = to_fc_internal(shost->transportt);      \
708         char *cp;                                                       \
709         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
710             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
711             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
712                 return -EBUSY;                                          \
713         val = simple_strtoul(buf, &cp, 0);                              \
714         if (*cp && (*cp != '\n'))                                       \
715                 return -EINVAL;                                         \
716         i->f->set_rport_##field(rport, val);                            \
717         return count;                                                   \
718 }
719
720 #define fc_rport_rd_attr(field, format_string, sz)                      \
721         fc_rport_show_function(field, format_string, sz, )              \
722 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
723                          show_fc_rport_##field, NULL)
724
725 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
726         fc_rport_show_function(field, format_string, sz, (cast))        \
727 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
728                           show_fc_rport_##field, NULL)
729
730 #define fc_rport_rw_attr(field, format_string, sz)                      \
731         fc_rport_show_function(field, format_string, sz, )              \
732         fc_rport_store_function(field)                                  \
733 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
734                         show_fc_rport_##field,                          \
735                         store_fc_rport_##field)
736
737
738 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
739 static ssize_t                                                          \
740 show_fc_rport_##field (struct device *dev,                              \
741                        struct device_attribute *attr, char *buf)        \
742 {                                                                       \
743         struct fc_rport *rport = transport_class_to_rport(dev);         \
744         return snprintf(buf, sz, format_string, cast rport->field);     \
745 }
746
747 #define fc_private_rport_rd_attr(field, format_string, sz)              \
748         fc_private_rport_show_function(field, format_string, sz, )      \
749 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
750                          show_fc_rport_##field, NULL)
751
752 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
753         fc_private_rport_show_function(field, format_string, sz, (cast)) \
754 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
755                           show_fc_rport_##field, NULL)
756
757
758 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
759 static ssize_t                                                          \
760 show_fc_rport_##title (struct device *dev,                              \
761                        struct device_attribute *attr, char *buf)        \
762 {                                                                       \
763         struct fc_rport *rport = transport_class_to_rport(dev);         \
764         const char *name;                                               \
765         name = get_fc_##title##_name(rport->title);                     \
766         if (!name)                                                      \
767                 return -EINVAL;                                         \
768         return snprintf(buf, maxlen, "%s\n", name);                     \
769 }                                                                       \
770 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
771                         show_fc_rport_##title, NULL)
772
773
774 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
775         i->private_rport_attrs[count] = device_attr_rport_##field; \
776         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
777         i->private_rport_attrs[count].store = NULL;                     \
778         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
779         if (i->f->show_rport_##field)                                   \
780                 count++
781
782 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
783         i->private_rport_attrs[count] = device_attr_rport_##field; \
784         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
785         i->private_rport_attrs[count].store = NULL;                     \
786         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
787         count++
788
789 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
790         i->private_rport_attrs[count] = device_attr_rport_##field; \
791         if (!i->f->set_rport_##field) {                                 \
792                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
793                 i->private_rport_attrs[count].store = NULL;             \
794         }                                                               \
795         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
796         if (i->f->show_rport_##field)                                   \
797                 count++
798
799 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
800 {                                                                       \
801         i->private_rport_attrs[count] = device_attr_rport_##field; \
802         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
803         count++;                                                        \
804 }
805
806
807 /* The FC Transport Remote Port Attributes: */
808
809 /* Fixed Remote Port Attributes */
810
811 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
812
813 static ssize_t
814 show_fc_rport_supported_classes (struct device *dev,
815                                  struct device_attribute *attr, char *buf)
816 {
817         struct fc_rport *rport = transport_class_to_rport(dev);
818         if (rport->supported_classes == FC_COS_UNSPECIFIED)
819                 return snprintf(buf, 20, "unspecified\n");
820         return get_fc_cos_names(rport->supported_classes, buf);
821 }
822 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
823                 show_fc_rport_supported_classes, NULL);
824
825 /* Dynamic Remote Port Attributes */
826
827 /*
828  * dev_loss_tmo attribute
829  */
830 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
831 static ssize_t
832 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
833                             const char *buf, size_t count)
834 {
835         int val;
836         struct fc_rport *rport = transport_class_to_rport(dev);
837         struct Scsi_Host *shost = rport_to_shost(rport);
838         struct fc_internal *i = to_fc_internal(shost->transportt);
839         char *cp;
840         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
841             (rport->port_state == FC_PORTSTATE_DELETED) ||
842             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
843                 return -EBUSY;
844         val = simple_strtoul(buf, &cp, 0);
845         if ((*cp && (*cp != '\n')) ||
846             (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
847                 return -EINVAL;
848         i->f->set_rport_dev_loss_tmo(rport, val);
849         return count;
850 }
851 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
852                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
853
854
855 /* Private Remote Port Attributes */
856
857 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
858 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
859 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
860
861 static ssize_t
862 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
863                      char *buf)
864 {
865         struct fc_rport *rport = transport_class_to_rport(dev);
866
867         /* identify any roles that are port_id specific */
868         if ((rport->port_id != -1) &&
869             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
870                                         FC_WELLKNOWN_PORTID_MASK) {
871                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
872                 case FC_FPORT_PORTID:
873                         return snprintf(buf, 30, "Fabric Port\n");
874                 case FC_FABCTLR_PORTID:
875                         return snprintf(buf, 30, "Fabric Controller\n");
876                 case FC_DIRSRVR_PORTID:
877                         return snprintf(buf, 30, "Directory Server\n");
878                 case FC_TIMESRVR_PORTID:
879                         return snprintf(buf, 30, "Time Server\n");
880                 case FC_MGMTSRVR_PORTID:
881                         return snprintf(buf, 30, "Management Server\n");
882                 default:
883                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
884                 }
885         } else {
886                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
887                         return snprintf(buf, 20, "unknown\n");
888                 return get_fc_port_roles_names(rport->roles, buf);
889         }
890 }
891 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
892                 show_fc_rport_roles, NULL);
893
894 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
895 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
896
897 /*
898  * fast_io_fail_tmo attribute
899  */
900 static ssize_t
901 show_fc_rport_fast_io_fail_tmo (struct device *dev,
902                                 struct device_attribute *attr, char *buf)
903 {
904         struct fc_rport *rport = transport_class_to_rport(dev);
905
906         if (rport->fast_io_fail_tmo == -1)
907                 return snprintf(buf, 5, "off\n");
908         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
909 }
910
911 static ssize_t
912 store_fc_rport_fast_io_fail_tmo(struct device *dev,
913                                 struct device_attribute *attr, const char *buf,
914                                 size_t count)
915 {
916         int val;
917         char *cp;
918         struct fc_rport *rport = transport_class_to_rport(dev);
919
920         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
921             (rport->port_state == FC_PORTSTATE_DELETED) ||
922             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
923                 return -EBUSY;
924         if (strncmp(buf, "off", 3) == 0)
925                 rport->fast_io_fail_tmo = -1;
926         else {
927                 val = simple_strtoul(buf, &cp, 0);
928                 if ((*cp && (*cp != '\n')) ||
929                     (val < 0) || (val >= rport->dev_loss_tmo))
930                         return -EINVAL;
931                 rport->fast_io_fail_tmo = val;
932         }
933         return count;
934 }
935 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
936         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
937
938
939 /*
940  * FC SCSI Target Attribute Management
941  */
942
943 /*
944  * Note: in the target show function we recognize when the remote
945  *  port is in the heirarchy and do not allow the driver to get
946  *  involved in sysfs functions. The driver only gets involved if
947  *  it's the "old" style that doesn't use rports.
948  */
949 #define fc_starget_show_function(field, format_string, sz, cast)        \
950 static ssize_t                                                          \
951 show_fc_starget_##field (struct device *dev,                            \
952                          struct device_attribute *attr, char *buf)      \
953 {                                                                       \
954         struct scsi_target *starget = transport_class_to_starget(dev);  \
955         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
956         struct fc_internal *i = to_fc_internal(shost->transportt);      \
957         struct fc_rport *rport = starget_to_rport(starget);             \
958         if (rport)                                                      \
959                 fc_starget_##field(starget) = rport->field;             \
960         else if (i->f->get_starget_##field)                             \
961                 i->f->get_starget_##field(starget);                     \
962         return snprintf(buf, sz, format_string,                         \
963                 cast fc_starget_##field(starget));                      \
964 }
965
966 #define fc_starget_rd_attr(field, format_string, sz)                    \
967         fc_starget_show_function(field, format_string, sz, )            \
968 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
969                          show_fc_starget_##field, NULL)
970
971 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
972         fc_starget_show_function(field, format_string, sz, (cast))      \
973 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
974                           show_fc_starget_##field, NULL)
975
976 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
977         i->private_starget_attrs[count] = device_attr_starget_##field; \
978         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
979         i->private_starget_attrs[count].store = NULL;                   \
980         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
981         if (i->f->show_starget_##field)                                 \
982                 count++
983
984 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
985         i->private_starget_attrs[count] = device_attr_starget_##field; \
986         if (!i->f->set_starget_##field) {                               \
987                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
988                 i->private_starget_attrs[count].store = NULL;           \
989         }                                                               \
990         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
991         if (i->f->show_starget_##field)                                 \
992                 count++
993
994 /* The FC Transport SCSI Target Attributes: */
995 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
996 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
997 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
998
999
1000 /*
1001  * FC Virtual Port Attribute Management
1002  */
1003
1004 #define fc_vport_show_function(field, format_string, sz, cast)          \
1005 static ssize_t                                                          \
1006 show_fc_vport_##field (struct device *dev,                              \
1007                        struct device_attribute *attr, char *buf)        \
1008 {                                                                       \
1009         struct fc_vport *vport = transport_class_to_vport(dev);         \
1010         struct Scsi_Host *shost = vport_to_shost(vport);                \
1011         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1012         if ((i->f->get_vport_##field) &&                                \
1013             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1014                 i->f->get_vport_##field(vport);                         \
1015         return snprintf(buf, sz, format_string, cast vport->field);     \
1016 }
1017
1018 #define fc_vport_store_function(field)                                  \
1019 static ssize_t                                                          \
1020 store_fc_vport_##field(struct device *dev,                              \
1021                        struct device_attribute *attr,                   \
1022                        const char *buf, size_t count)                   \
1023 {                                                                       \
1024         int val;                                                        \
1025         struct fc_vport *vport = transport_class_to_vport(dev);         \
1026         struct Scsi_Host *shost = vport_to_shost(vport);                \
1027         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1028         char *cp;                                                       \
1029         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1030                 return -EBUSY;                                          \
1031         val = simple_strtoul(buf, &cp, 0);                              \
1032         if (*cp && (*cp != '\n'))                                       \
1033                 return -EINVAL;                                         \
1034         i->f->set_vport_##field(vport, val);                            \
1035         return count;                                                   \
1036 }
1037
1038 #define fc_vport_store_str_function(field, slen)                        \
1039 static ssize_t                                                          \
1040 store_fc_vport_##field(struct device *dev,                              \
1041                        struct device_attribute *attr,                   \
1042                        const char *buf, size_t count)                   \
1043 {                                                                       \
1044         struct fc_vport *vport = transport_class_to_vport(dev);         \
1045         struct Scsi_Host *shost = vport_to_shost(vport);                \
1046         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1047         unsigned int cnt=count;                                         \
1048                                                                         \
1049         /* count may include a LF at end of string */                   \
1050         if (buf[cnt-1] == '\n')                                         \
1051                 cnt--;                                                  \
1052         if (cnt > ((slen) - 1))                                         \
1053                 return -EINVAL;                                         \
1054         memcpy(vport->field, buf, cnt);                                 \
1055         i->f->set_vport_##field(vport);                                 \
1056         return count;                                                   \
1057 }
1058
1059 #define fc_vport_rd_attr(field, format_string, sz)                      \
1060         fc_vport_show_function(field, format_string, sz, )              \
1061 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1062                          show_fc_vport_##field, NULL)
1063
1064 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1065         fc_vport_show_function(field, format_string, sz, (cast))        \
1066 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1067                           show_fc_vport_##field, NULL)
1068
1069 #define fc_vport_rw_attr(field, format_string, sz)                      \
1070         fc_vport_show_function(field, format_string, sz, )              \
1071         fc_vport_store_function(field)                                  \
1072 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1073                         show_fc_vport_##field,                          \
1074                         store_fc_vport_##field)
1075
1076 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1077 static ssize_t                                                          \
1078 show_fc_vport_##field (struct device *dev,                              \
1079                        struct device_attribute *attr, char *buf)        \
1080 {                                                                       \
1081         struct fc_vport *vport = transport_class_to_vport(dev);         \
1082         return snprintf(buf, sz, format_string, cast vport->field);     \
1083 }
1084
1085 #define fc_private_vport_store_u32_function(field)                      \
1086 static ssize_t                                                          \
1087 store_fc_vport_##field(struct device *dev,                              \
1088                        struct device_attribute *attr,                   \
1089                        const char *buf, size_t count)                   \
1090 {                                                                       \
1091         u32 val;                                                        \
1092         struct fc_vport *vport = transport_class_to_vport(dev);         \
1093         char *cp;                                                       \
1094         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1095                 return -EBUSY;                                          \
1096         val = simple_strtoul(buf, &cp, 0);                              \
1097         if (*cp && (*cp != '\n'))                                       \
1098                 return -EINVAL;                                         \
1099         vport->field = val;                                             \
1100         return count;                                                   \
1101 }
1102
1103
1104 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1105         fc_private_vport_show_function(field, format_string, sz, )      \
1106 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1107                          show_fc_vport_##field, NULL)
1108
1109 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1110         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1111 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1112                           show_fc_vport_##field, NULL)
1113
1114 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1115         fc_private_vport_show_function(field, format_string, sz, )      \
1116         fc_private_vport_store_u32_function(field)                      \
1117 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1118                         show_fc_vport_##field,                          \
1119                         store_fc_vport_##field)
1120
1121
1122 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1123 static ssize_t                                                          \
1124 show_fc_vport_##title (struct device *dev,                              \
1125                        struct device_attribute *attr,                   \
1126                        char *buf)                                       \
1127 {                                                                       \
1128         struct fc_vport *vport = transport_class_to_vport(dev);         \
1129         const char *name;                                               \
1130         name = get_fc_##title##_name(vport->title);                     \
1131         if (!name)                                                      \
1132                 return -EINVAL;                                         \
1133         return snprintf(buf, maxlen, "%s\n", name);                     \
1134 }                                                                       \
1135 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1136                         show_fc_vport_##title, NULL)
1137
1138
1139 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1140         i->private_vport_attrs[count] = device_attr_vport_##field; \
1141         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1142         i->private_vport_attrs[count].store = NULL;                     \
1143         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1144         if (i->f->get_##field)                                          \
1145                 count++
1146         /* NOTE: Above MACRO differs: checks function not show bit */
1147
1148 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1149         i->private_vport_attrs[count] = device_attr_vport_##field; \
1150         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1151         i->private_vport_attrs[count].store = NULL;                     \
1152         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1153         count++
1154
1155 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1156         i->private_vport_attrs[count] = device_attr_vport_##field; \
1157         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1158         if (i->f->field)                                                \
1159                 count++
1160         /* NOTE: Above MACRO differs: checks function */
1161
1162 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1163         i->private_vport_attrs[count] = device_attr_vport_##field; \
1164         if (!i->f->set_vport_##field) {                                 \
1165                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1166                 i->private_vport_attrs[count].store = NULL;             \
1167         }                                                               \
1168         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1169         count++
1170         /* NOTE: Above MACRO differs: does not check show bit */
1171
1172 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1173 {                                                                       \
1174         i->private_vport_attrs[count] = device_attr_vport_##field; \
1175         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1176         count++;                                                        \
1177 }
1178
1179
1180 /* The FC Transport Virtual Port Attributes: */
1181
1182 /* Fixed Virtual Port Attributes */
1183
1184 /* Dynamic Virtual Port Attributes */
1185
1186 /* Private Virtual Port Attributes */
1187
1188 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1189 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1190 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1191 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1192
1193 static ssize_t
1194 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1195                      char *buf)
1196 {
1197         struct fc_vport *vport = transport_class_to_vport(dev);
1198
1199         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1200                 return snprintf(buf, 20, "unknown\n");
1201         return get_fc_port_roles_names(vport->roles, buf);
1202 }
1203 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1204
1205 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1206
1207 fc_private_vport_show_function(symbolic_name, "%s\n",
1208                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1209 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1210 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1211                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1212
1213 static ssize_t
1214 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1215                       const char *buf, size_t count)
1216 {
1217         struct fc_vport *vport = transport_class_to_vport(dev);
1218         struct Scsi_Host *shost = vport_to_shost(vport);
1219
1220         fc_queue_work(shost, &vport->vport_delete_work);
1221         return count;
1222 }
1223 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1224                         NULL, store_fc_vport_delete);
1225
1226
1227 /*
1228  * Enable/Disable vport
1229  *  Write "1" to disable, write "0" to enable
1230  */
1231 static ssize_t
1232 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1233                        const char *buf,
1234                            size_t count)
1235 {
1236         struct fc_vport *vport = transport_class_to_vport(dev);
1237         struct Scsi_Host *shost = vport_to_shost(vport);
1238         struct fc_internal *i = to_fc_internal(shost->transportt);
1239         int stat;
1240
1241         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1242                 return -EBUSY;
1243
1244         if (*buf == '0') {
1245                 if (vport->vport_state != FC_VPORT_DISABLED)
1246                         return -EALREADY;
1247         } else if (*buf == '1') {
1248                 if (vport->vport_state == FC_VPORT_DISABLED)
1249                         return -EALREADY;
1250         } else
1251                 return -EINVAL;
1252
1253         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1254         return stat ? stat : count;
1255 }
1256 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1257                         NULL, store_fc_vport_disable);
1258
1259
1260 /*
1261  * Host Attribute Management
1262  */
1263
1264 #define fc_host_show_function(field, format_string, sz, cast)           \
1265 static ssize_t                                                          \
1266 show_fc_host_##field (struct device *dev,                               \
1267                       struct device_attribute *attr, char *buf)         \
1268 {                                                                       \
1269         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1270         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1271         if (i->f->get_host_##field)                                     \
1272                 i->f->get_host_##field(shost);                          \
1273         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1274 }
1275
1276 #define fc_host_store_function(field)                                   \
1277 static ssize_t                                                          \
1278 store_fc_host_##field(struct device *dev,                               \
1279                       struct device_attribute *attr,                    \
1280                       const char *buf,  size_t count)                   \
1281 {                                                                       \
1282         int val;                                                        \
1283         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1284         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1285         char *cp;                                                       \
1286                                                                         \
1287         val = simple_strtoul(buf, &cp, 0);                              \
1288         if (*cp && (*cp != '\n'))                                       \
1289                 return -EINVAL;                                         \
1290         i->f->set_host_##field(shost, val);                             \
1291         return count;                                                   \
1292 }
1293
1294 #define fc_host_store_str_function(field, slen)                         \
1295 static ssize_t                                                          \
1296 store_fc_host_##field(struct device *dev,                               \
1297                       struct device_attribute *attr,                    \
1298                       const char *buf, size_t count)                    \
1299 {                                                                       \
1300         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1301         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1302         unsigned int cnt=count;                                         \
1303                                                                         \
1304         /* count may include a LF at end of string */                   \
1305         if (buf[cnt-1] == '\n')                                         \
1306                 cnt--;                                                  \
1307         if (cnt > ((slen) - 1))                                         \
1308                 return -EINVAL;                                         \
1309         memcpy(fc_host_##field(shost), buf, cnt);                       \
1310         i->f->set_host_##field(shost);                                  \
1311         return count;                                                   \
1312 }
1313
1314 #define fc_host_rd_attr(field, format_string, sz)                       \
1315         fc_host_show_function(field, format_string, sz, )               \
1316 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1317                          show_fc_host_##field, NULL)
1318
1319 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1320         fc_host_show_function(field, format_string, sz, (cast))         \
1321 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1322                           show_fc_host_##field, NULL)
1323
1324 #define fc_host_rw_attr(field, format_string, sz)                       \
1325         fc_host_show_function(field, format_string, sz, )               \
1326         fc_host_store_function(field)                                   \
1327 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1328                         show_fc_host_##field,                           \
1329                         store_fc_host_##field)
1330
1331 #define fc_host_rd_enum_attr(title, maxlen)                             \
1332 static ssize_t                                                          \
1333 show_fc_host_##title (struct device *dev,                               \
1334                       struct device_attribute *attr, char *buf)         \
1335 {                                                                       \
1336         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1337         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1338         const char *name;                                               \
1339         if (i->f->get_host_##title)                                     \
1340                 i->f->get_host_##title(shost);                          \
1341         name = get_fc_##title##_name(fc_host_##title(shost));           \
1342         if (!name)                                                      \
1343                 return -EINVAL;                                         \
1344         return snprintf(buf, maxlen, "%s\n", name);                     \
1345 }                                                                       \
1346 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1347
1348 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1349         i->private_host_attrs[count] = device_attr_host_##field;        \
1350         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1351         i->private_host_attrs[count].store = NULL;                      \
1352         i->host_attrs[count] = &i->private_host_attrs[count];           \
1353         if (i->f->show_host_##field)                                    \
1354                 count++
1355
1356 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1357         i->private_host_attrs[count] = device_attr_host_##field;        \
1358         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1359         i->private_host_attrs[count].store = NULL;                      \
1360         i->host_attrs[count] = &i->private_host_attrs[count];           \
1361         count++
1362
1363 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1364         i->private_host_attrs[count] = device_attr_host_##field;        \
1365         if (!i->f->set_host_##field) {                                  \
1366                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1367                 i->private_host_attrs[count].store = NULL;              \
1368         }                                                               \
1369         i->host_attrs[count] = &i->private_host_attrs[count];           \
1370         if (i->f->show_host_##field)                                    \
1371                 count++
1372
1373
1374 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1375 static ssize_t                                                          \
1376 show_fc_host_##field (struct device *dev,                               \
1377                       struct device_attribute *attr, char *buf)         \
1378 {                                                                       \
1379         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1380         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1381 }
1382
1383 #define fc_private_host_rd_attr(field, format_string, sz)               \
1384         fc_private_host_show_function(field, format_string, sz, )       \
1385 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1386                          show_fc_host_##field, NULL)
1387
1388 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1389         fc_private_host_show_function(field, format_string, sz, (cast)) \
1390 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1391                           show_fc_host_##field, NULL)
1392
1393 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1394         i->private_host_attrs[count] = device_attr_host_##field;        \
1395         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1396         i->private_host_attrs[count].store = NULL;                      \
1397         i->host_attrs[count] = &i->private_host_attrs[count];           \
1398         count++
1399
1400 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1401 {                                                                       \
1402         i->private_host_attrs[count] = device_attr_host_##field;        \
1403         i->host_attrs[count] = &i->private_host_attrs[count];           \
1404         count++;                                                        \
1405 }
1406
1407
1408 /* Fixed Host Attributes */
1409
1410 static ssize_t
1411 show_fc_host_supported_classes (struct device *dev,
1412                                 struct device_attribute *attr, char *buf)
1413 {
1414         struct Scsi_Host *shost = transport_class_to_shost(dev);
1415
1416         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1417                 return snprintf(buf, 20, "unspecified\n");
1418
1419         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1420 }
1421 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1422                 show_fc_host_supported_classes, NULL);
1423
1424 static ssize_t
1425 show_fc_host_supported_fc4s (struct device *dev,
1426                              struct device_attribute *attr, char *buf)
1427 {
1428         struct Scsi_Host *shost = transport_class_to_shost(dev);
1429         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1430 }
1431 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1432                 show_fc_host_supported_fc4s, NULL);
1433
1434 static ssize_t
1435 show_fc_host_supported_speeds (struct device *dev,
1436                                struct device_attribute *attr, char *buf)
1437 {
1438         struct Scsi_Host *shost = transport_class_to_shost(dev);
1439
1440         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1441                 return snprintf(buf, 20, "unknown\n");
1442
1443         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1444 }
1445 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1446                 show_fc_host_supported_speeds, NULL);
1447
1448
1449 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1450 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1451 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1452                              unsigned long long);
1453 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1454 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1455 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1456
1457
1458 /* Dynamic Host Attributes */
1459
1460 static ssize_t
1461 show_fc_host_active_fc4s (struct device *dev,
1462                           struct device_attribute *attr, char *buf)
1463 {
1464         struct Scsi_Host *shost = transport_class_to_shost(dev);
1465         struct fc_internal *i = to_fc_internal(shost->transportt);
1466
1467         if (i->f->get_host_active_fc4s)
1468                 i->f->get_host_active_fc4s(shost);
1469
1470         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1471 }
1472 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1473                 show_fc_host_active_fc4s, NULL);
1474
1475 static ssize_t
1476 show_fc_host_speed (struct device *dev,
1477                     struct device_attribute *attr, char *buf)
1478 {
1479         struct Scsi_Host *shost = transport_class_to_shost(dev);
1480         struct fc_internal *i = to_fc_internal(shost->transportt);
1481
1482         if (i->f->get_host_speed)
1483                 i->f->get_host_speed(shost);
1484
1485         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1486                 return snprintf(buf, 20, "unknown\n");
1487
1488         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1489 }
1490 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1491                 show_fc_host_speed, NULL);
1492
1493
1494 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1495 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1496 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1497 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1498 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1499
1500 fc_private_host_show_function(system_hostname, "%s\n",
1501                 FC_SYMBOLIC_NAME_SIZE + 1, )
1502 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1503 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1504                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1505
1506
1507 /* Private Host Attributes */
1508
1509 static ssize_t
1510 show_fc_private_host_tgtid_bind_type(struct device *dev,
1511                                      struct device_attribute *attr, char *buf)
1512 {
1513         struct Scsi_Host *shost = transport_class_to_shost(dev);
1514         const char *name;
1515
1516         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1517         if (!name)
1518                 return -EINVAL;
1519         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1520 }
1521
1522 #define get_list_head_entry(pos, head, member)          \
1523         pos = list_entry((head)->next, typeof(*pos), member)
1524
1525 static ssize_t
1526 store_fc_private_host_tgtid_bind_type(struct device *dev,
1527         struct device_attribute *attr, const char *buf, size_t count)
1528 {
1529         struct Scsi_Host *shost = transport_class_to_shost(dev);
1530         struct fc_rport *rport;
1531         enum fc_tgtid_binding_type val;
1532         unsigned long flags;
1533
1534         if (get_fc_tgtid_bind_type_match(buf, &val))
1535                 return -EINVAL;
1536
1537         /* if changing bind type, purge all unused consistent bindings */
1538         if (val != fc_host_tgtid_bind_type(shost)) {
1539                 spin_lock_irqsave(shost->host_lock, flags);
1540                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1541                         get_list_head_entry(rport,
1542                                 &fc_host_rport_bindings(shost), peers);
1543                         list_del(&rport->peers);
1544                         rport->port_state = FC_PORTSTATE_DELETED;
1545                         fc_queue_work(shost, &rport->rport_delete_work);
1546                 }
1547                 spin_unlock_irqrestore(shost->host_lock, flags);
1548         }
1549
1550         fc_host_tgtid_bind_type(shost) = val;
1551         return count;
1552 }
1553
1554 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1555                         show_fc_private_host_tgtid_bind_type,
1556                         store_fc_private_host_tgtid_bind_type);
1557
1558 static ssize_t
1559 store_fc_private_host_issue_lip(struct device *dev,
1560         struct device_attribute *attr, const char *buf, size_t count)
1561 {
1562         struct Scsi_Host *shost = transport_class_to_shost(dev);
1563         struct fc_internal *i = to_fc_internal(shost->transportt);
1564         int ret;
1565
1566         /* ignore any data value written to the attribute */
1567         if (i->f->issue_fc_host_lip) {
1568                 ret = i->f->issue_fc_host_lip(shost);
1569                 return ret ? ret: count;
1570         }
1571
1572         return -ENOENT;
1573 }
1574
1575 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1576                         store_fc_private_host_issue_lip);
1577
1578 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1579
1580
1581 /*
1582  * Host Statistics Management
1583  */
1584
1585 /* Show a given an attribute in the statistics group */
1586 static ssize_t
1587 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1588 {
1589         struct Scsi_Host *shost = transport_class_to_shost(dev);
1590         struct fc_internal *i = to_fc_internal(shost->transportt);
1591         struct fc_host_statistics *stats;
1592         ssize_t ret = -ENOENT;
1593
1594         if (offset > sizeof(struct fc_host_statistics) ||
1595             offset % sizeof(u64) != 0)
1596                 WARN_ON(1);
1597
1598         if (i->f->get_fc_host_stats) {
1599                 stats = (i->f->get_fc_host_stats)(shost);
1600                 if (stats)
1601                         ret = snprintf(buf, 20, "0x%llx\n",
1602                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1603         }
1604         return ret;
1605 }
1606
1607
1608 /* generate a read-only statistics attribute */
1609 #define fc_host_statistic(name)                                         \
1610 static ssize_t show_fcstat_##name(struct device *cd,                    \
1611                                   struct device_attribute *attr,        \
1612                                   char *buf)                            \
1613 {                                                                       \
1614         return fc_stat_show(cd, buf,                                    \
1615                             offsetof(struct fc_host_statistics, name)); \
1616 }                                                                       \
1617 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1618
1619 fc_host_statistic(seconds_since_last_reset);
1620 fc_host_statistic(tx_frames);
1621 fc_host_statistic(tx_words);
1622 fc_host_statistic(rx_frames);
1623 fc_host_statistic(rx_words);
1624 fc_host_statistic(lip_count);
1625 fc_host_statistic(nos_count);
1626 fc_host_statistic(error_frames);
1627 fc_host_statistic(dumped_frames);
1628 fc_host_statistic(link_failure_count);
1629 fc_host_statistic(loss_of_sync_count);
1630 fc_host_statistic(loss_of_signal_count);
1631 fc_host_statistic(prim_seq_protocol_err_count);
1632 fc_host_statistic(invalid_tx_word_count);
1633 fc_host_statistic(invalid_crc_count);
1634 fc_host_statistic(fcp_input_requests);
1635 fc_host_statistic(fcp_output_requests);
1636 fc_host_statistic(fcp_control_requests);
1637 fc_host_statistic(fcp_input_megabytes);
1638 fc_host_statistic(fcp_output_megabytes);
1639
1640 static ssize_t
1641 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1642                     const char *buf, size_t count)
1643 {
1644         struct Scsi_Host *shost = transport_class_to_shost(dev);
1645         struct fc_internal *i = to_fc_internal(shost->transportt);
1646
1647         /* ignore any data value written to the attribute */
1648         if (i->f->reset_fc_host_stats) {
1649                 i->f->reset_fc_host_stats(shost);
1650                 return count;
1651         }
1652
1653         return -ENOENT;
1654 }
1655 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1656                                 fc_reset_statistics);
1657
1658 static struct attribute *fc_statistics_attrs[] = {
1659         &device_attr_host_seconds_since_last_reset.attr,
1660         &device_attr_host_tx_frames.attr,
1661         &device_attr_host_tx_words.attr,
1662         &device_attr_host_rx_frames.attr,
1663         &device_attr_host_rx_words.attr,
1664         &device_attr_host_lip_count.attr,
1665         &device_attr_host_nos_count.attr,
1666         &device_attr_host_error_frames.attr,
1667         &device_attr_host_dumped_frames.attr,
1668         &device_attr_host_link_failure_count.attr,
1669         &device_attr_host_loss_of_sync_count.attr,
1670         &device_attr_host_loss_of_signal_count.attr,
1671         &device_attr_host_prim_seq_protocol_err_count.attr,
1672         &device_attr_host_invalid_tx_word_count.attr,
1673         &device_attr_host_invalid_crc_count.attr,
1674         &device_attr_host_fcp_input_requests.attr,
1675         &device_attr_host_fcp_output_requests.attr,
1676         &device_attr_host_fcp_control_requests.attr,
1677         &device_attr_host_fcp_input_megabytes.attr,
1678         &device_attr_host_fcp_output_megabytes.attr,
1679         &device_attr_host_reset_statistics.attr,
1680         NULL
1681 };
1682
1683 static struct attribute_group fc_statistics_group = {
1684         .name = "statistics",
1685         .attrs = fc_statistics_attrs,
1686 };
1687
1688
1689 /* Host Vport Attributes */
1690
1691 static int
1692 fc_parse_wwn(const char *ns, u64 *nm)
1693 {
1694         unsigned int i, j;
1695         u8 wwn[8];
1696
1697         memset(wwn, 0, sizeof(wwn));
1698
1699         /* Validate and store the new name */
1700         for (i=0, j=0; i < 16; i++) {
1701                 if ((*ns >= 'a') && (*ns <= 'f'))
1702                         j = ((j << 4) | ((*ns++ -'a') + 10));
1703                 else if ((*ns >= 'A') && (*ns <= 'F'))
1704                         j = ((j << 4) | ((*ns++ -'A') + 10));
1705                 else if ((*ns >= '0') && (*ns <= '9'))
1706                         j = ((j << 4) | (*ns++ -'0'));
1707                 else
1708                         return -EINVAL;
1709                 if (i % 2) {
1710                         wwn[i/2] = j & 0xff;
1711                         j = 0;
1712                 }
1713         }
1714
1715         *nm = wwn_to_u64(wwn);
1716
1717         return 0;
1718 }
1719
1720
1721 /*
1722  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1723  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1724  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1725  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1726  */
1727 static ssize_t
1728 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1729                            const char *buf, size_t count)
1730 {
1731         struct Scsi_Host *shost = transport_class_to_shost(dev);
1732         struct fc_vport_identifiers vid;
1733         struct fc_vport *vport;
1734         unsigned int cnt=count;
1735         int stat;
1736
1737         memset(&vid, 0, sizeof(vid));
1738
1739         /* count may include a LF at end of string */
1740         if (buf[cnt-1] == '\n')
1741                 cnt--;
1742
1743         /* validate we have enough characters for WWPN */
1744         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1745                 return -EINVAL;
1746
1747         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1748         if (stat)
1749                 return stat;
1750
1751         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1752         if (stat)
1753                 return stat;
1754
1755         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1756         vid.vport_type = FC_PORTTYPE_NPIV;
1757         /* vid.symbolic_name is already zero/NULL's */
1758         vid.disable = false;            /* always enabled */
1759
1760         /* we only allow support on Channel 0 !!! */
1761         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1762         return stat ? stat : count;
1763 }
1764 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1765                         store_fc_host_vport_create);
1766
1767
1768 /*
1769  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1770  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1771  * The WWNs are specified as hex characters, and may *not* contain
1772  * any prefixes (e.g. 0x, x, etc)
1773  */
1774 static ssize_t
1775 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1776                            const char *buf, size_t count)
1777 {
1778         struct Scsi_Host *shost = transport_class_to_shost(dev);
1779         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1780         struct fc_vport *vport;
1781         u64 wwpn, wwnn;
1782         unsigned long flags;
1783         unsigned int cnt=count;
1784         int stat, match;
1785
1786         /* count may include a LF at end of string */
1787         if (buf[cnt-1] == '\n')
1788                 cnt--;
1789
1790         /* validate we have enough characters for WWPN */
1791         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1792                 return -EINVAL;
1793
1794         stat = fc_parse_wwn(&buf[0], &wwpn);
1795         if (stat)
1796                 return stat;
1797
1798         stat = fc_parse_wwn(&buf[17], &wwnn);
1799         if (stat)
1800                 return stat;
1801
1802         spin_lock_irqsave(shost->host_lock, flags);
1803         match = 0;
1804         /* we only allow support on Channel 0 !!! */
1805         list_for_each_entry(vport, &fc_host->vports, peers) {
1806                 if ((vport->channel == 0) &&
1807                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1808                         match = 1;
1809                         break;
1810                 }
1811         }
1812         spin_unlock_irqrestore(shost->host_lock, flags);
1813
1814         if (!match)
1815                 return -ENODEV;
1816
1817         stat = fc_vport_terminate(vport);
1818         return stat ? stat : count;
1819 }
1820 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1821                         store_fc_host_vport_delete);
1822
1823
1824 static int fc_host_match(struct attribute_container *cont,
1825                           struct device *dev)
1826 {
1827         struct Scsi_Host *shost;
1828         struct fc_internal *i;
1829
1830         if (!scsi_is_host_device(dev))
1831                 return 0;
1832
1833         shost = dev_to_shost(dev);
1834         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1835             != &fc_host_class.class)
1836                 return 0;
1837
1838         i = to_fc_internal(shost->transportt);
1839
1840         return &i->t.host_attrs.ac == cont;
1841 }
1842
1843 static int fc_target_match(struct attribute_container *cont,
1844                             struct device *dev)
1845 {
1846         struct Scsi_Host *shost;
1847         struct fc_internal *i;
1848
1849         if (!scsi_is_target_device(dev))
1850                 return 0;
1851
1852         shost = dev_to_shost(dev->parent);
1853         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1854             != &fc_host_class.class)
1855                 return 0;
1856
1857         i = to_fc_internal(shost->transportt);
1858
1859         return &i->t.target_attrs.ac == cont;
1860 }
1861
1862 static void fc_rport_dev_release(struct device *dev)
1863 {
1864         struct fc_rport *rport = dev_to_rport(dev);
1865         put_device(dev->parent);
1866         kfree(rport);
1867 }
1868
1869 int scsi_is_fc_rport(const struct device *dev)
1870 {
1871         return dev->release == fc_rport_dev_release;
1872 }
1873 EXPORT_SYMBOL(scsi_is_fc_rport);
1874
1875 static int fc_rport_match(struct attribute_container *cont,
1876                             struct device *dev)
1877 {
1878         struct Scsi_Host *shost;
1879         struct fc_internal *i;
1880
1881         if (!scsi_is_fc_rport(dev))
1882                 return 0;
1883
1884         shost = dev_to_shost(dev->parent);
1885         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1886             != &fc_host_class.class)
1887                 return 0;
1888
1889         i = to_fc_internal(shost->transportt);
1890
1891         return &i->rport_attr_cont.ac == cont;
1892 }
1893
1894
1895 static void fc_vport_dev_release(struct device *dev)
1896 {
1897         struct fc_vport *vport = dev_to_vport(dev);
1898         put_device(dev->parent);                /* release kobj parent */
1899         kfree(vport);
1900 }
1901
1902 int scsi_is_fc_vport(const struct device *dev)
1903 {
1904         return dev->release == fc_vport_dev_release;
1905 }
1906 EXPORT_SYMBOL(scsi_is_fc_vport);
1907
1908 static int fc_vport_match(struct attribute_container *cont,
1909                             struct device *dev)
1910 {
1911         struct fc_vport *vport;
1912         struct Scsi_Host *shost;
1913         struct fc_internal *i;
1914
1915         if (!scsi_is_fc_vport(dev))
1916                 return 0;
1917         vport = dev_to_vport(dev);
1918
1919         shost = vport_to_shost(vport);
1920         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1921             != &fc_host_class.class)
1922                 return 0;
1923
1924         i = to_fc_internal(shost->transportt);
1925         return &i->vport_attr_cont.ac == cont;
1926 }
1927
1928
1929 /**
1930  * fc_timed_out - FC Transport I/O timeout intercept handler
1931  * @scmd:       The SCSI command which timed out
1932  *
1933  * This routine protects against error handlers getting invoked while a
1934  * rport is in a blocked state, typically due to a temporarily loss of
1935  * connectivity. If the error handlers are allowed to proceed, requests
1936  * to abort i/o, reset the target, etc will likely fail as there is no way
1937  * to communicate with the device to perform the requested function. These
1938  * failures may result in the midlayer taking the device offline, requiring
1939  * manual intervention to restore operation.
1940  *
1941  * This routine, called whenever an i/o times out, validates the state of
1942  * the underlying rport. If the rport is blocked, it returns
1943  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1944  * Eventually, either the device will return, or devloss_tmo will fire,
1945  * and when the timeout then fires, it will be handled normally.
1946  * If the rport is not blocked, normal error handling continues.
1947  *
1948  * Notes:
1949  *      This routine assumes no locks are held on entry.
1950  */
1951 static enum blk_eh_timer_return
1952 fc_timed_out(struct scsi_cmnd *scmd)
1953 {
1954         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1955
1956         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1957                 return BLK_EH_RESET_TIMER;
1958
1959         return BLK_EH_NOT_HANDLED;
1960 }
1961
1962 /*
1963  * Called by fc_user_scan to locate an rport on the shost that
1964  * matches the channel and target id, and invoke scsi_scan_target()
1965  * on the rport.
1966  */
1967 static void
1968 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
1969 {
1970         struct fc_rport *rport;
1971         unsigned long flags;
1972
1973         spin_lock_irqsave(shost->host_lock, flags);
1974
1975         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
1976                 if (rport->scsi_target_id == -1)
1977                         continue;
1978
1979                 if (rport->port_state != FC_PORTSTATE_ONLINE)
1980                         continue;
1981
1982                 if ((channel == rport->channel) &&
1983                     (id == rport->scsi_target_id)) {
1984                         spin_unlock_irqrestore(shost->host_lock, flags);
1985                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
1986                         return;
1987                 }
1988         }
1989
1990         spin_unlock_irqrestore(shost->host_lock, flags);
1991 }
1992
1993 /*
1994  * Called via sysfs scan routines. Necessary, as the FC transport
1995  * wants to place all target objects below the rport object. So this
1996  * routine must invoke the scsi_scan_target() routine with the rport
1997  * object as the parent.
1998  */
1999 static int
2000 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2001 {
2002         uint chlo, chhi;
2003         uint tgtlo, tgthi;
2004
2005         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2006             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2007             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2008                 return -EINVAL;
2009
2010         if (channel == SCAN_WILD_CARD) {
2011                 chlo = 0;
2012                 chhi = shost->max_channel + 1;
2013         } else {
2014                 chlo = channel;
2015                 chhi = channel + 1;
2016         }
2017
2018         if (id == SCAN_WILD_CARD) {
2019                 tgtlo = 0;
2020                 tgthi = shost->max_id;
2021         } else {
2022                 tgtlo = id;
2023                 tgthi = id + 1;
2024         }
2025
2026         for ( ; chlo < chhi; chlo++)
2027                 for ( ; tgtlo < tgthi; tgtlo++)
2028                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2029
2030         return 0;
2031 }
2032
2033 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2034                                 int result)
2035 {
2036         struct fc_internal *i = to_fc_internal(shost->transportt);
2037         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2038 }
2039
2040 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2041 {
2042         struct fc_internal *i = to_fc_internal(shost->transportt);
2043         return i->f->it_nexus_response(shost, nexus, result);
2044 }
2045
2046 struct scsi_transport_template *
2047 fc_attach_transport(struct fc_function_template *ft)
2048 {
2049         int count;
2050         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2051                                         GFP_KERNEL);
2052
2053         if (unlikely(!i))
2054                 return NULL;
2055
2056         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2057         i->t.target_attrs.ac.class = &fc_transport_class.class;
2058         i->t.target_attrs.ac.match = fc_target_match;
2059         i->t.target_size = sizeof(struct fc_starget_attrs);
2060         transport_container_register(&i->t.target_attrs);
2061
2062         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2063         i->t.host_attrs.ac.class = &fc_host_class.class;
2064         i->t.host_attrs.ac.match = fc_host_match;
2065         i->t.host_size = sizeof(struct fc_host_attrs);
2066         if (ft->get_fc_host_stats)
2067                 i->t.host_attrs.statistics = &fc_statistics_group;
2068         transport_container_register(&i->t.host_attrs);
2069
2070         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2071         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2072         i->rport_attr_cont.ac.match = fc_rport_match;
2073         transport_container_register(&i->rport_attr_cont);
2074
2075         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2076         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2077         i->vport_attr_cont.ac.match = fc_vport_match;
2078         transport_container_register(&i->vport_attr_cont);
2079
2080         i->f = ft;
2081
2082         /* Transport uses the shost workq for scsi scanning */
2083         i->t.create_work_queue = 1;
2084
2085         i->t.eh_timed_out = fc_timed_out;
2086
2087         i->t.user_scan = fc_user_scan;
2088
2089         /* target-mode drivers' functions */
2090         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2091         i->t.it_nexus_response = fc_it_nexus_response;
2092
2093         /*
2094          * Setup SCSI Target Attributes.
2095          */
2096         count = 0;
2097         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2098         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2099         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2100
2101         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2102
2103         i->starget_attrs[count] = NULL;
2104
2105
2106         /*
2107          * Setup SCSI Host Attributes.
2108          */
2109         count=0;
2110         SETUP_HOST_ATTRIBUTE_RD(node_name);
2111         SETUP_HOST_ATTRIBUTE_RD(port_name);
2112         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2113         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2114         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2115         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2116         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2117         if (ft->vport_create) {
2118                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2119                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2120         }
2121         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2122
2123         SETUP_HOST_ATTRIBUTE_RD(port_id);
2124         SETUP_HOST_ATTRIBUTE_RD(port_type);
2125         SETUP_HOST_ATTRIBUTE_RD(port_state);
2126         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2127         SETUP_HOST_ATTRIBUTE_RD(speed);
2128         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2129         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2130         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2131
2132         /* Transport-managed attributes */
2133         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2134         if (ft->issue_fc_host_lip)
2135                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2136         if (ft->vport_create)
2137                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2138         if (ft->vport_delete)
2139                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2140
2141         BUG_ON(count > FC_HOST_NUM_ATTRS);
2142
2143         i->host_attrs[count] = NULL;
2144
2145         /*
2146          * Setup Remote Port Attributes.
2147          */
2148         count=0;
2149         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2150         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2151         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2152         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2153         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2154         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2155         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2156         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2157         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2158         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2159
2160         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2161
2162         i->rport_attrs[count] = NULL;
2163
2164         /*
2165          * Setup Virtual Port Attributes.
2166          */
2167         count=0;
2168         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2169         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2170         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2171         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2172         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2173         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2174         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2175         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2176         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2177
2178         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2179
2180         i->vport_attrs[count] = NULL;
2181
2182         return &i->t;
2183 }
2184 EXPORT_SYMBOL(fc_attach_transport);
2185
2186 void fc_release_transport(struct scsi_transport_template *t)
2187 {
2188         struct fc_internal *i = to_fc_internal(t);
2189
2190         transport_container_unregister(&i->t.target_attrs);
2191         transport_container_unregister(&i->t.host_attrs);
2192         transport_container_unregister(&i->rport_attr_cont);
2193         transport_container_unregister(&i->vport_attr_cont);
2194
2195         kfree(i);
2196 }
2197 EXPORT_SYMBOL(fc_release_transport);
2198
2199 /**
2200  * fc_queue_work - Queue work to the fc_host workqueue.
2201  * @shost:      Pointer to Scsi_Host bound to fc_host.
2202  * @work:       Work to queue for execution.
2203  *
2204  * Return value:
2205  *      1 - work queued for execution
2206  *      0 - work is already queued
2207  *      -EINVAL - work queue doesn't exist
2208  */
2209 static int
2210 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2211 {
2212         if (unlikely(!fc_host_work_q(shost))) {
2213                 printk(KERN_ERR
2214                         "ERROR: FC host '%s' attempted to queue work, "
2215                         "when no workqueue created.\n", shost->hostt->name);
2216                 dump_stack();
2217
2218                 return -EINVAL;
2219         }
2220
2221         return queue_work(fc_host_work_q(shost), work);
2222 }
2223
2224 /**
2225  * fc_flush_work - Flush a fc_host's workqueue.
2226  * @shost:      Pointer to Scsi_Host bound to fc_host.
2227  */
2228 static void
2229 fc_flush_work(struct Scsi_Host *shost)
2230 {
2231         if (!fc_host_work_q(shost)) {
2232                 printk(KERN_ERR
2233                         "ERROR: FC host '%s' attempted to flush work, "
2234                         "when no workqueue created.\n", shost->hostt->name);
2235                 dump_stack();
2236                 return;
2237         }
2238
2239         flush_workqueue(fc_host_work_q(shost));
2240 }
2241
2242 /**
2243  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2244  * @shost:      Pointer to Scsi_Host bound to fc_host.
2245  * @work:       Work to queue for execution.
2246  * @delay:      jiffies to delay the work queuing
2247  *
2248  * Return value:
2249  *      1 on success / 0 already queued / < 0 for error
2250  */
2251 static int
2252 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2253                                 unsigned long delay)
2254 {
2255         if (unlikely(!fc_host_devloss_work_q(shost))) {
2256                 printk(KERN_ERR
2257                         "ERROR: FC host '%s' attempted to queue work, "
2258                         "when no workqueue created.\n", shost->hostt->name);
2259                 dump_stack();
2260
2261                 return -EINVAL;
2262         }
2263
2264         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2265 }
2266
2267 /**
2268  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2269  * @shost:      Pointer to Scsi_Host bound to fc_host.
2270  */
2271 static void
2272 fc_flush_devloss(struct Scsi_Host *shost)
2273 {
2274         if (!fc_host_devloss_work_q(shost)) {
2275                 printk(KERN_ERR
2276                         "ERROR: FC host '%s' attempted to flush work, "
2277                         "when no workqueue created.\n", shost->hostt->name);
2278                 dump_stack();
2279                 return;
2280         }
2281
2282         flush_workqueue(fc_host_devloss_work_q(shost));
2283 }
2284
2285
2286 /**
2287  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2288  * @shost:      Which &Scsi_Host
2289  *
2290  * This routine is expected to be called immediately preceeding the
2291  * a driver's call to scsi_remove_host().
2292  *
2293  * WARNING: A driver utilizing the fc_transport, which fails to call
2294  *   this routine prior to scsi_remove_host(), will leave dangling
2295  *   objects in /sys/class/fc_remote_ports. Access to any of these
2296  *   objects can result in a system crash !!!
2297  *
2298  * Notes:
2299  *      This routine assumes no locks are held on entry.
2300  */
2301 void
2302 fc_remove_host(struct Scsi_Host *shost)
2303 {
2304         struct fc_vport *vport = NULL, *next_vport = NULL;
2305         struct fc_rport *rport = NULL, *next_rport = NULL;
2306         struct workqueue_struct *work_q;
2307         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2308         unsigned long flags;
2309
2310         spin_lock_irqsave(shost->host_lock, flags);
2311
2312         /* Remove any vports */
2313         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2314                 fc_queue_work(shost, &vport->vport_delete_work);
2315
2316         /* Remove any remote ports */
2317         list_for_each_entry_safe(rport, next_rport,
2318                         &fc_host->rports, peers) {
2319                 list_del(&rport->peers);
2320                 rport->port_state = FC_PORTSTATE_DELETED;
2321                 fc_queue_work(shost, &rport->rport_delete_work);
2322         }
2323
2324         list_for_each_entry_safe(rport, next_rport,
2325                         &fc_host->rport_bindings, peers) {
2326                 list_del(&rport->peers);
2327                 rport->port_state = FC_PORTSTATE_DELETED;
2328                 fc_queue_work(shost, &rport->rport_delete_work);
2329         }
2330
2331         spin_unlock_irqrestore(shost->host_lock, flags);
2332
2333         /* flush all scan work items */
2334         scsi_flush_work(shost);
2335
2336         /* flush all stgt delete, and rport delete work items, then kill it  */
2337         if (fc_host->work_q) {
2338                 work_q = fc_host->work_q;
2339                 fc_host->work_q = NULL;
2340                 destroy_workqueue(work_q);
2341         }
2342
2343         /* flush all devloss work items, then kill it  */
2344         if (fc_host->devloss_work_q) {
2345                 work_q = fc_host->devloss_work_q;
2346                 fc_host->devloss_work_q = NULL;
2347                 destroy_workqueue(work_q);
2348         }
2349 }
2350 EXPORT_SYMBOL(fc_remove_host);
2351
2352 static void fc_terminate_rport_io(struct fc_rport *rport)
2353 {
2354         struct Scsi_Host *shost = rport_to_shost(rport);
2355         struct fc_internal *i = to_fc_internal(shost->transportt);
2356
2357         /* Involve the LLDD if possible to terminate all io on the rport. */
2358         if (i->f->terminate_rport_io)
2359                 i->f->terminate_rport_io(rport);
2360
2361         /*
2362          * must unblock to flush queued IO. The caller will have set
2363          * the port_state or flags, so that fc_remote_port_chkready will
2364          * fail IO.
2365          */
2366         scsi_target_unblock(&rport->dev);
2367 }
2368
2369 /**
2370  * fc_starget_delete - called to delete the scsi decendents of an rport
2371  * @work:       remote port to be operated on.
2372  *
2373  * Deletes target and all sdevs.
2374  */
2375 static void
2376 fc_starget_delete(struct work_struct *work)
2377 {
2378         struct fc_rport *rport =
2379                 container_of(work, struct fc_rport, stgt_delete_work);
2380
2381         fc_terminate_rport_io(rport);
2382         scsi_remove_target(&rport->dev);
2383 }
2384
2385
2386 /**
2387  * fc_rport_final_delete - finish rport termination and delete it.
2388  * @work:       remote port to be deleted.
2389  */
2390 static void
2391 fc_rport_final_delete(struct work_struct *work)
2392 {
2393         struct fc_rport *rport =
2394                 container_of(work, struct fc_rport, rport_delete_work);
2395         struct device *dev = &rport->dev;
2396         struct Scsi_Host *shost = rport_to_shost(rport);
2397         struct fc_internal *i = to_fc_internal(shost->transportt);
2398         unsigned long flags;
2399         int do_callback = 0;
2400
2401         /*
2402          * if a scan is pending, flush the SCSI Host work_q so that
2403          * that we can reclaim the rport scan work element.
2404          */
2405         if (rport->flags & FC_RPORT_SCAN_PENDING)
2406                 scsi_flush_work(shost);
2407
2408         fc_terminate_rport_io(rport);
2409
2410         /*
2411          * Cancel any outstanding timers. These should really exist
2412          * only when rmmod'ing the LLDD and we're asking for
2413          * immediate termination of the rports
2414          */
2415         spin_lock_irqsave(shost->host_lock, flags);
2416         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2417                 spin_unlock_irqrestore(shost->host_lock, flags);
2418                 if (!cancel_delayed_work(&rport->fail_io_work))
2419                         fc_flush_devloss(shost);
2420                 if (!cancel_delayed_work(&rport->dev_loss_work))
2421                         fc_flush_devloss(shost);
2422                 spin_lock_irqsave(shost->host_lock, flags);
2423                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2424         }
2425         spin_unlock_irqrestore(shost->host_lock, flags);
2426
2427         /* Delete SCSI target and sdevs */
2428         if (rport->scsi_target_id != -1)
2429                 fc_starget_delete(&rport->stgt_delete_work);
2430
2431         /*
2432          * Notify the driver that the rport is now dead. The LLDD will
2433          * also guarantee that any communication to the rport is terminated
2434          *
2435          * Avoid this call if we already called it when we preserved the
2436          * rport for the binding.
2437          */
2438         spin_lock_irqsave(shost->host_lock, flags);
2439         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2440             (i->f->dev_loss_tmo_callbk)) {
2441                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2442                 do_callback = 1;
2443         }
2444         spin_unlock_irqrestore(shost->host_lock, flags);
2445
2446         if (do_callback)
2447                 i->f->dev_loss_tmo_callbk(rport);
2448
2449         fc_bsg_remove(rport->rqst_q);
2450
2451         transport_remove_device(dev);
2452         device_del(dev);
2453         transport_destroy_device(dev);
2454         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2455         put_device(dev);                        /* for self-reference */
2456 }
2457
2458
2459 /**
2460  * fc_rport_create - allocates and creates a remote FC port.
2461  * @shost:      scsi host the remote port is connected to.
2462  * @channel:    Channel on shost port connected to.
2463  * @ids:        The world wide names, fc address, and FC4 port
2464  *              roles for the remote port.
2465  *
2466  * Allocates and creates the remoter port structure, including the
2467  * class and sysfs creation.
2468  *
2469  * Notes:
2470  *      This routine assumes no locks are held on entry.
2471  */
2472 static struct fc_rport *
2473 fc_rport_create(struct Scsi_Host *shost, int channel,
2474         struct fc_rport_identifiers  *ids)
2475 {
2476         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2477         struct fc_internal *fci = to_fc_internal(shost->transportt);
2478         struct fc_rport *rport;
2479         struct device *dev;
2480         unsigned long flags;
2481         int error;
2482         size_t size;
2483
2484         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2485         rport = kzalloc(size, GFP_KERNEL);
2486         if (unlikely(!rport)) {
2487                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2488                 return NULL;
2489         }
2490
2491         rport->maxframe_size = -1;
2492         rport->supported_classes = FC_COS_UNSPECIFIED;
2493         rport->dev_loss_tmo = fc_dev_loss_tmo;
2494         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2495         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2496         rport->port_id = ids->port_id;
2497         rport->roles = ids->roles;
2498         rport->port_state = FC_PORTSTATE_ONLINE;
2499         if (fci->f->dd_fcrport_size)
2500                 rport->dd_data = &rport[1];
2501         rport->channel = channel;
2502         rport->fast_io_fail_tmo = -1;
2503
2504         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2505         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2506         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2507         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2508         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2509
2510         spin_lock_irqsave(shost->host_lock, flags);
2511
2512         rport->number = fc_host->next_rport_number++;
2513         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2514                 rport->scsi_target_id = fc_host->next_target_id++;
2515         else
2516                 rport->scsi_target_id = -1;
2517         list_add_tail(&rport->peers, &fc_host->rports);
2518         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2519
2520         spin_unlock_irqrestore(shost->host_lock, flags);
2521
2522         dev = &rport->dev;
2523         device_initialize(dev);                 /* takes self reference */
2524         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2525         dev->release = fc_rport_dev_release;
2526         dev_set_name(dev, "rport-%d:%d-%d",
2527                      shost->host_no, channel, rport->number);
2528         transport_setup_device(dev);
2529
2530         error = device_add(dev);
2531         if (error) {
2532                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2533                 goto delete_rport;
2534         }
2535         transport_add_device(dev);
2536         transport_configure_device(dev);
2537
2538         fc_bsg_rportadd(shost, rport);
2539         /* ignore any bsg add error - we just can't do sgio */
2540
2541         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2542                 /* initiate a scan of the target */
2543                 rport->flags |= FC_RPORT_SCAN_PENDING;
2544                 scsi_queue_work(shost, &rport->scan_work);
2545         }
2546
2547         return rport;
2548
2549 delete_rport:
2550         transport_destroy_device(dev);
2551         spin_lock_irqsave(shost->host_lock, flags);
2552         list_del(&rport->peers);
2553         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2554         spin_unlock_irqrestore(shost->host_lock, flags);
2555         put_device(dev->parent);
2556         kfree(rport);
2557         return NULL;
2558 }
2559
2560 /**
2561  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2562  * @shost:      scsi host the remote port is connected to.
2563  * @channel:    Channel on shost port connected to.
2564  * @ids:        The world wide names, fc address, and FC4 port
2565  *              roles for the remote port.
2566  *
2567  * The LLDD calls this routine to notify the transport of the existence
2568  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2569  * of the port, it's FC address (port_id), and the FC4 roles that are
2570  * active for the port.
2571  *
2572  * For ports that are FCP targets (aka scsi targets), the FC transport
2573  * maintains consistent target id bindings on behalf of the LLDD.
2574  * A consistent target id binding is an assignment of a target id to
2575  * a remote port identifier, which persists while the scsi host is
2576  * attached. The remote port can disappear, then later reappear, and
2577  * it's target id assignment remains the same. This allows for shifts
2578  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2579  * changes to the scsi subsystem which is based on scsi host number and
2580  * target id values.  Bindings are only valid during the attachment of
2581  * the scsi host. If the host detaches, then later re-attaches, target
2582  * id bindings may change.
2583  *
2584  * This routine is responsible for returning a remote port structure.
2585  * The routine will search the list of remote ports it maintains
2586  * internally on behalf of consistent target id mappings. If found, the
2587  * remote port structure will be reused. Otherwise, a new remote port
2588  * structure will be allocated.
2589  *
2590  * Whenever a remote port is allocated, a new fc_remote_port class
2591  * device is created.
2592  *
2593  * Should not be called from interrupt context.
2594  *
2595  * Notes:
2596  *      This routine assumes no locks are held on entry.
2597  */
2598 struct fc_rport *
2599 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2600         struct fc_rport_identifiers  *ids)
2601 {
2602         struct fc_internal *fci = to_fc_internal(shost->transportt);
2603         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2604         struct fc_rport *rport;
2605         unsigned long flags;
2606         int match = 0;
2607
2608         /* ensure any stgt delete functions are done */
2609         fc_flush_work(shost);
2610
2611         /*
2612          * Search the list of "active" rports, for an rport that has been
2613          * deleted, but we've held off the real delete while the target
2614          * is in a "blocked" state.
2615          */
2616         spin_lock_irqsave(shost->host_lock, flags);
2617
2618         list_for_each_entry(rport, &fc_host->rports, peers) {
2619
2620                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2621                         (rport->channel == channel)) {
2622
2623                         switch (fc_host->tgtid_bind_type) {
2624                         case FC_TGTID_BIND_BY_WWPN:
2625                         case FC_TGTID_BIND_NONE:
2626                                 if (rport->port_name == ids->port_name)
2627                                         match = 1;
2628                                 break;
2629                         case FC_TGTID_BIND_BY_WWNN:
2630                                 if (rport->node_name == ids->node_name)
2631                                         match = 1;
2632                                 break;
2633                         case FC_TGTID_BIND_BY_ID:
2634                                 if (rport->port_id == ids->port_id)
2635                                         match = 1;
2636                                 break;
2637                         }
2638
2639                         if (match) {
2640
2641                                 memcpy(&rport->node_name, &ids->node_name,
2642                                         sizeof(rport->node_name));
2643                                 memcpy(&rport->port_name, &ids->port_name,
2644                                         sizeof(rport->port_name));
2645                                 rport->port_id = ids->port_id;
2646
2647                                 rport->port_state = FC_PORTSTATE_ONLINE;
2648                                 rport->roles = ids->roles;
2649
2650                                 spin_unlock_irqrestore(shost->host_lock, flags);
2651
2652                                 if (fci->f->dd_fcrport_size)
2653                                         memset(rport->dd_data, 0,
2654                                                 fci->f->dd_fcrport_size);
2655
2656                                 /*
2657                                  * If we were not a target, cancel the
2658                                  * io terminate and rport timers, and
2659                                  * we're done.
2660                                  *
2661                                  * If we were a target, but our new role
2662                                  * doesn't indicate a target, leave the
2663                                  * timers running expecting the role to
2664                                  * change as the target fully logs in. If
2665                                  * it doesn't, the target will be torn down.
2666                                  *
2667                                  * If we were a target, and our role shows
2668                                  * we're still a target, cancel the timers
2669                                  * and kick off a scan.
2670                                  */
2671
2672                                 /* was a target, not in roles */
2673                                 if ((rport->scsi_target_id != -1) &&
2674                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2675                                         return rport;
2676
2677                                 /*
2678                                  * Stop the fail io and dev_loss timers.
2679                                  * If they flush, the port_state will
2680                                  * be checked and will NOOP the function.
2681                                  */
2682                                 if (!cancel_delayed_work(&rport->fail_io_work))
2683                                         fc_flush_devloss(shost);
2684                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2685                                         fc_flush_devloss(shost);
2686
2687                                 spin_lock_irqsave(shost->host_lock, flags);
2688
2689                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2690                                                   FC_RPORT_DEVLOSS_PENDING |
2691                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2692
2693                                 /* if target, initiate a scan */
2694                                 if (rport->scsi_target_id != -1) {
2695                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2696                                         scsi_queue_work(shost,
2697                                                         &rport->scan_work);
2698                                         spin_unlock_irqrestore(shost->host_lock,
2699                                                         flags);
2700                                         scsi_target_unblock(&rport->dev);
2701                                 } else
2702                                         spin_unlock_irqrestore(shost->host_lock,
2703                                                         flags);
2704
2705                                 fc_bsg_goose_queue(rport);
2706
2707                                 return rport;
2708                         }
2709                 }
2710         }
2711
2712         /*
2713          * Search the bindings array
2714          * Note: if never a FCP target, you won't be on this list
2715          */
2716         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2717
2718                 /* search for a matching consistent binding */
2719
2720                 list_for_each_entry(rport, &fc_host->rport_bindings,
2721                                         peers) {
2722                         if (rport->channel != channel)
2723                                 continue;
2724
2725                         switch (fc_host->tgtid_bind_type) {
2726                         case FC_TGTID_BIND_BY_WWPN:
2727                                 if (rport->port_name == ids->port_name)
2728                                         match = 1;
2729                                 break;
2730                         case FC_TGTID_BIND_BY_WWNN:
2731                                 if (rport->node_name == ids->node_name)
2732                                         match = 1;
2733                                 break;
2734                         case FC_TGTID_BIND_BY_ID:
2735                                 if (rport->port_id == ids->port_id)
2736                                         match = 1;
2737                                 break;
2738                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2739                                 break;
2740                         }
2741
2742                         if (match) {
2743                                 list_move_tail(&rport->peers, &fc_host->rports);
2744                                 break;
2745                         }
2746                 }
2747
2748                 if (match) {
2749                         memcpy(&rport->node_name, &ids->node_name,
2750                                 sizeof(rport->node_name));
2751                         memcpy(&rport->port_name, &ids->port_name,
2752                                 sizeof(rport->port_name));
2753                         rport->port_id = ids->port_id;
2754                         rport->roles = ids->roles;
2755                         rport->port_state = FC_PORTSTATE_ONLINE;
2756                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2757
2758                         if (fci->f->dd_fcrport_size)
2759                                 memset(rport->dd_data, 0,
2760                                                 fci->f->dd_fcrport_size);
2761
2762                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2763                                 /* initiate a scan of the target */
2764                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2765                                 scsi_queue_work(shost, &rport->scan_work);
2766                                 spin_unlock_irqrestore(shost->host_lock, flags);
2767                                 scsi_target_unblock(&rport->dev);
2768                         } else
2769                                 spin_unlock_irqrestore(shost->host_lock, flags);
2770
2771                         return rport;
2772                 }
2773         }
2774
2775         spin_unlock_irqrestore(shost->host_lock, flags);
2776
2777         /* No consistent binding found - create new remote port entry */
2778         rport = fc_rport_create(shost, channel, ids);
2779
2780         return rport;
2781 }
2782 EXPORT_SYMBOL(fc_remote_port_add);
2783
2784
2785 /**
2786  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2787  * @rport:      The remote port that no longer exists
2788  *
2789  * The LLDD calls this routine to notify the transport that a remote
2790  * port is no longer part of the topology. Note: Although a port
2791  * may no longer be part of the topology, it may persist in the remote
2792  * ports displayed by the fc_host. We do this under 2 conditions:
2793  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2794  *   This allows the port to temporarily disappear, then reappear without
2795  *   disrupting the SCSI device tree attached to it. During the "blocked"
2796  *   period the port will still exist.
2797  * 2) If the port was a scsi target and disappears for longer than we
2798  *   expect, we'll delete the port and the tear down the SCSI device tree
2799  *   attached to it. However, we want to semi-persist the target id assigned
2800  *   to that port if it eventually does exist. The port structure will
2801  *   remain (although with minimal information) so that the target id
2802  *   bindings remails.
2803  *
2804  * If the remote port is not an FCP Target, it will be fully torn down
2805  * and deallocated, including the fc_remote_port class device.
2806  *
2807  * If the remote port is an FCP Target, the port will be placed in a
2808  * temporary blocked state. From the LLDD's perspective, the rport no
2809  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2810  * exists, but all sdevs on it are blocked from further I/O. The following
2811  * is then expected.
2812  *
2813  *   If the remote port does not return (signaled by a LLDD call to
2814  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2815  *   scsi target is removed - killing all outstanding i/o and removing the
2816  *   scsi devices attached ot it. The port structure will be marked Not
2817  *   Present and be partially cleared, leaving only enough information to
2818  *   recognize the remote port relative to the scsi target id binding if
2819  *   it later appears.  The port will remain as long as there is a valid
2820  *   binding (e.g. until the user changes the binding type or unloads the
2821  *   scsi host with the binding).
2822  *
2823  *   If the remote port returns within the dev_loss_tmo value (and matches
2824  *   according to the target id binding type), the port structure will be
2825  *   reused. If it is no longer a SCSI target, the target will be torn
2826  *   down. If it continues to be a SCSI target, then the target will be
2827  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2828  *   to ensure that all luns are detected.
2829  *
2830  * Called from normal process context only - cannot be called from interrupt.
2831  *
2832  * Notes:
2833  *      This routine assumes no locks are held on entry.
2834  */
2835 void
2836 fc_remote_port_delete(struct fc_rport  *rport)
2837 {
2838         struct Scsi_Host *shost = rport_to_shost(rport);
2839         int timeout = rport->dev_loss_tmo;
2840         unsigned long flags;
2841
2842         /*
2843          * No need to flush the fc_host work_q's, as all adds are synchronous.
2844          *
2845          * We do need to reclaim the rport scan work element, so eventually
2846          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2847          * there's still a scan pending.
2848          */
2849
2850         spin_lock_irqsave(shost->host_lock, flags);
2851
2852         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2853                 spin_unlock_irqrestore(shost->host_lock, flags);
2854                 return;
2855         }
2856
2857         /*
2858          * In the past, we if this was not an FCP-Target, we would
2859          * unconditionally just jump to deleting the rport.
2860          * However, rports can be used as node containers by the LLDD,
2861          * and its not appropriate to just terminate the rport at the
2862          * first sign of a loss in connectivity. The LLDD may want to
2863          * send ELS traffic to re-validate the login. If the rport is
2864          * immediately deleted, it makes it inappropriate for a node
2865          * container.
2866          * So... we now unconditionally wait dev_loss_tmo before
2867          * destroying an rport.
2868          */
2869
2870         rport->port_state = FC_PORTSTATE_BLOCKED;
2871
2872         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2873
2874         spin_unlock_irqrestore(shost->host_lock, flags);
2875
2876         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2877             shost->active_mode & MODE_TARGET)
2878                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2879
2880         scsi_target_block(&rport->dev);
2881
2882         /* see if we need to kill io faster than waiting for device loss */
2883         if ((rport->fast_io_fail_tmo != -1) &&
2884             (rport->fast_io_fail_tmo < timeout))
2885                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2886                                         rport->fast_io_fail_tmo * HZ);
2887
2888         /* cap the length the devices can be blocked until they are deleted */
2889         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2890 }
2891 EXPORT_SYMBOL(fc_remote_port_delete);
2892
2893 /**
2894  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2895  * @rport:      The remote port that changed.
2896  * @roles:      New roles for this port.
2897  *
2898  * Description: The LLDD calls this routine to notify the transport that the
2899  * roles on a remote port may have changed. The largest effect of this is
2900  * if a port now becomes a FCP Target, it must be allocated a
2901  * scsi target id.  If the port is no longer a FCP target, any
2902  * scsi target id value assigned to it will persist in case the
2903  * role changes back to include FCP Target. No changes in the scsi
2904  * midlayer will be invoked if the role changes (in the expectation
2905  * that the role will be resumed. If it doesn't normal error processing
2906  * will take place).
2907  *
2908  * Should not be called from interrupt context.
2909  *
2910  * Notes:
2911  *      This routine assumes no locks are held on entry.
2912  */
2913 void
2914 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2915 {
2916         struct Scsi_Host *shost = rport_to_shost(rport);
2917         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2918         unsigned long flags;
2919         int create = 0;
2920         int ret;
2921
2922         spin_lock_irqsave(shost->host_lock, flags);
2923         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2924                 if (rport->scsi_target_id == -1) {
2925                         rport->scsi_target_id = fc_host->next_target_id++;
2926                         create = 1;
2927                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2928                         create = 1;
2929         } else if (shost->active_mode & MODE_TARGET) {
2930                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2931                                              (char *)&rport->node_name);
2932                 if (ret)
2933                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2934                                ret);
2935         }
2936
2937         rport->roles = roles;
2938
2939         spin_unlock_irqrestore(shost->host_lock, flags);
2940
2941         if (create) {
2942                 /*
2943                  * There may have been a delete timer running on the
2944                  * port. Ensure that it is cancelled as we now know
2945                  * the port is an FCP Target.
2946                  * Note: we know the rport is exists and in an online
2947                  *  state as the LLDD would not have had an rport
2948                  *  reference to pass us.
2949                  *
2950                  * Take no action on the del_timer failure as the state
2951                  * machine state change will validate the
2952                  * transaction.
2953                  */
2954                 if (!cancel_delayed_work(&rport->fail_io_work))
2955                         fc_flush_devloss(shost);
2956                 if (!cancel_delayed_work(&rport->dev_loss_work))
2957                         fc_flush_devloss(shost);
2958
2959                 spin_lock_irqsave(shost->host_lock, flags);
2960                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2961                                   FC_RPORT_DEVLOSS_PENDING);
2962                 spin_unlock_irqrestore(shost->host_lock, flags);
2963
2964                 /* ensure any stgt delete functions are done */
2965                 fc_flush_work(shost);
2966
2967                 /* initiate a scan of the target */
2968                 spin_lock_irqsave(shost->host_lock, flags);
2969                 rport->flags |= FC_RPORT_SCAN_PENDING;
2970                 scsi_queue_work(shost, &rport->scan_work);
2971                 spin_unlock_irqrestore(shost->host_lock, flags);
2972                 scsi_target_unblock(&rport->dev);
2973         }
2974 }
2975 EXPORT_SYMBOL(fc_remote_port_rolechg);
2976
2977 /**
2978  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
2979  * @work:       rport target that failed to reappear in the allotted time.
2980  *
2981  * Description: An attempt to delete a remote port blocks, and if it fails
2982  *              to return in the allotted time this gets called.
2983  */
2984 static void
2985 fc_timeout_deleted_rport(struct work_struct *work)
2986 {
2987         struct fc_rport *rport =
2988                 container_of(work, struct fc_rport, dev_loss_work.work);
2989         struct Scsi_Host *shost = rport_to_shost(rport);
2990         struct fc_internal *i = to_fc_internal(shost->transportt);
2991         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2992         unsigned long flags;
2993         int do_callback = 0;
2994
2995         spin_lock_irqsave(shost->host_lock, flags);
2996
2997         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2998
2999         /*
3000          * If the port is ONLINE, then it came back. If it was a SCSI
3001          * target, validate it still is. If not, tear down the
3002          * scsi_target on it.
3003          */
3004         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3005             (rport->scsi_target_id != -1) &&
3006             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3007                 dev_printk(KERN_ERR, &rport->dev,
3008                         "blocked FC remote port time out: no longer"
3009                         " a FCP target, removing starget\n");
3010                 spin_unlock_irqrestore(shost->host_lock, flags);
3011                 scsi_target_unblock(&rport->dev);
3012                 fc_queue_work(shost, &rport->stgt_delete_work);
3013                 return;
3014         }
3015
3016         /* NOOP state - we're flushing workq's */
3017         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3018                 spin_unlock_irqrestore(shost->host_lock, flags);
3019                 dev_printk(KERN_ERR, &rport->dev,
3020                         "blocked FC remote port time out: leaving"
3021                         " rport%s alone\n",
3022                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3023                 return;
3024         }
3025
3026         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3027             (rport->scsi_target_id == -1)) {
3028                 list_del(&rport->peers);
3029                 rport->port_state = FC_PORTSTATE_DELETED;
3030                 dev_printk(KERN_ERR, &rport->dev,
3031                         "blocked FC remote port time out: removing"
3032                         " rport%s\n",
3033                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3034                 fc_queue_work(shost, &rport->rport_delete_work);
3035                 spin_unlock_irqrestore(shost->host_lock, flags);
3036                 return;
3037         }
3038
3039         dev_printk(KERN_ERR, &rport->dev,
3040                 "blocked FC remote port time out: removing target and "
3041                 "saving binding\n");
3042
3043         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3044
3045         /*
3046          * Note: We do not remove or clear the hostdata area. This allows
3047          *   host-specific target data to persist along with the
3048          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3049          */
3050
3051         /*
3052          * Reinitialize port attributes that may change if the port comes back.
3053          */
3054         rport->maxframe_size = -1;
3055         rport->supported_classes = FC_COS_UNSPECIFIED;
3056         rport->roles = FC_PORT_ROLE_UNKNOWN;
3057         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3058         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3059
3060         /*
3061          * Pre-emptively kill I/O rather than waiting for the work queue
3062          * item to teardown the starget. (FCOE libFC folks prefer this
3063          * and to have the rport_port_id still set when it's done).
3064          */
3065         spin_unlock_irqrestore(shost->host_lock, flags);
3066         fc_terminate_rport_io(rport);
3067
3068         spin_lock_irqsave(shost->host_lock, flags);
3069
3070         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3071
3072                 /* remove the identifiers that aren't used in the consisting binding */
3073                 switch (fc_host->tgtid_bind_type) {
3074                 case FC_TGTID_BIND_BY_WWPN:
3075                         rport->node_name = -1;
3076                         rport->port_id = -1;
3077                         break;
3078                 case FC_TGTID_BIND_BY_WWNN:
3079                         rport->port_name = -1;
3080                         rport->port_id = -1;
3081                         break;
3082                 case FC_TGTID_BIND_BY_ID:
3083                         rport->node_name = -1;
3084                         rport->port_name = -1;
3085                         break;
3086                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3087                         break;
3088                 }
3089
3090                 /*
3091                  * As this only occurs if the remote port (scsi target)
3092                  * went away and didn't come back - we'll remove
3093                  * all attached scsi devices.
3094                  */
3095                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3096                 fc_queue_work(shost, &rport->stgt_delete_work);
3097
3098                 do_callback = 1;
3099         }
3100
3101         spin_unlock_irqrestore(shost->host_lock, flags);
3102
3103         /*
3104          * Notify the driver that the rport is now dead. The LLDD will
3105          * also guarantee that any communication to the rport is terminated
3106          *
3107          * Note: we set the CALLBK_DONE flag above to correspond
3108          */
3109         if (do_callback && i->f->dev_loss_tmo_callbk)
3110                 i->f->dev_loss_tmo_callbk(rport);
3111 }
3112
3113
3114 /**
3115  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3116  * @work:       rport to terminate io on.
3117  *
3118  * Notes: Only requests the failure of the io, not that all are flushed
3119  *    prior to returning.
3120  */
3121 static void
3122 fc_timeout_fail_rport_io(struct work_struct *work)
3123 {
3124         struct fc_rport *rport =
3125                 container_of(work, struct fc_rport, fail_io_work.work);
3126
3127         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3128                 return;
3129
3130         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3131         fc_terminate_rport_io(rport);
3132 }
3133
3134 /**
3135  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3136  * @work:       remote port to be scanned.
3137  */
3138 static void
3139 fc_scsi_scan_rport(struct work_struct *work)
3140 {
3141         struct fc_rport *rport =
3142                 container_of(work, struct fc_rport, scan_work);
3143         struct Scsi_Host *shost = rport_to_shost(rport);
3144         struct fc_internal *i = to_fc_internal(shost->transportt);
3145         unsigned long flags;
3146
3147         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3148             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3149             !(i->f->disable_target_scan)) {
3150                 scsi_scan_target(&rport->dev, rport->channel,
3151                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3152         }
3153
3154         spin_lock_irqsave(shost->host_lock, flags);
3155         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3156         spin_unlock_irqrestore(shost->host_lock, flags);
3157 }
3158
3159 /**
3160  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3161  * @cmnd: SCSI command that scsi_eh is trying to recover
3162  *
3163  * This routine can be called from a FC LLD scsi_eh callback. It
3164  * blocks the scsi_eh thread until the fc_rport leaves the
3165  * FC_PORTSTATE_BLOCKED. This is necessary to avoid the scsi_eh
3166  * failing recovery actions for blocked rports which would lead to
3167  * offlined SCSI devices.
3168  */
3169 void fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3170 {
3171         struct Scsi_Host *shost = cmnd->device->host;
3172         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3173         unsigned long flags;
3174
3175         spin_lock_irqsave(shost->host_lock, flags);
3176         while (rport->port_state == FC_PORTSTATE_BLOCKED) {
3177                 spin_unlock_irqrestore(shost->host_lock, flags);
3178                 msleep(1000);
3179                 spin_lock_irqsave(shost->host_lock, flags);
3180         }
3181         spin_unlock_irqrestore(shost->host_lock, flags);
3182 }
3183 EXPORT_SYMBOL(fc_block_scsi_eh);
3184
3185 /**
3186  * fc_vport_setup - allocates and creates a FC virtual port.
3187  * @shost:      scsi host the virtual port is connected to.
3188  * @channel:    Channel on shost port connected to.
3189  * @pdev:       parent device for vport
3190  * @ids:        The world wide names, FC4 port roles, etc for
3191  *              the virtual port.
3192  * @ret_vport:  The pointer to the created vport.
3193  *
3194  * Allocates and creates the vport structure, calls the parent host
3195  * to instantiate the vport, the completes w/ class and sysfs creation.
3196  *
3197  * Notes:
3198  *      This routine assumes no locks are held on entry.
3199  */
3200 static int
3201 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3202         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3203 {
3204         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3205         struct fc_internal *fci = to_fc_internal(shost->transportt);
3206         struct fc_vport *vport;
3207         struct device *dev;
3208         unsigned long flags;
3209         size_t size;
3210         int error;
3211
3212         *ret_vport = NULL;
3213
3214         if ( ! fci->f->vport_create)
3215                 return -ENOENT;
3216
3217         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3218         vport = kzalloc(size, GFP_KERNEL);
3219         if (unlikely(!vport)) {
3220                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3221                 return -ENOMEM;
3222         }
3223
3224         vport->vport_state = FC_VPORT_UNKNOWN;
3225         vport->vport_last_state = FC_VPORT_UNKNOWN;
3226         vport->node_name = ids->node_name;
3227         vport->port_name = ids->port_name;
3228         vport->roles = ids->roles;
3229         vport->vport_type = ids->vport_type;
3230         if (fci->f->dd_fcvport_size)
3231                 vport->dd_data = &vport[1];
3232         vport->shost = shost;
3233         vport->channel = channel;
3234         vport->flags = FC_VPORT_CREATING;
3235         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3236
3237         spin_lock_irqsave(shost->host_lock, flags);
3238
3239         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3240                 spin_unlock_irqrestore(shost->host_lock, flags);
3241                 kfree(vport);
3242                 return -ENOSPC;
3243         }
3244         fc_host->npiv_vports_inuse++;
3245         vport->number = fc_host->next_vport_number++;
3246         list_add_tail(&vport->peers, &fc_host->vports);
3247         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3248
3249         spin_unlock_irqrestore(shost->host_lock, flags);
3250
3251         dev = &vport->dev;
3252         device_initialize(dev);                 /* takes self reference */
3253         dev->parent = get_device(pdev);         /* takes parent reference */
3254         dev->release = fc_vport_dev_release;
3255         dev_set_name(dev, "vport-%d:%d-%d",
3256                      shost->host_no, channel, vport->number);
3257         transport_setup_device(dev);
3258
3259         error = device_add(dev);
3260         if (error) {
3261                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3262                 goto delete_vport;
3263         }
3264         transport_add_device(dev);
3265         transport_configure_device(dev);
3266
3267         error = fci->f->vport_create(vport, ids->disable);
3268         if (error) {
3269                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3270                 goto delete_vport_all;
3271         }
3272
3273         /*
3274          * if the parent isn't the physical adapter's Scsi_Host, ensure
3275          * the Scsi_Host at least contains ia symlink to the vport.
3276          */
3277         if (pdev != &shost->shost_gendev) {
3278                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3279                                  &dev->kobj, dev_name(dev));
3280                 if (error)
3281                         printk(KERN_ERR
3282                                 "%s: Cannot create vport symlinks for "
3283                                 "%s, err=%d\n",
3284                                 __func__, dev_name(dev), error);
3285         }
3286         spin_lock_irqsave(shost->host_lock, flags);
3287         vport->flags &= ~FC_VPORT_CREATING;
3288         spin_unlock_irqrestore(shost->host_lock, flags);
3289
3290         dev_printk(KERN_NOTICE, pdev,
3291                         "%s created via shost%d channel %d\n", dev_name(dev),
3292                         shost->host_no, channel);
3293
3294         *ret_vport = vport;
3295
3296         return 0;
3297
3298 delete_vport_all:
3299         transport_remove_device(dev);
3300         device_del(dev);
3301 delete_vport:
3302         transport_destroy_device(dev);
3303         spin_lock_irqsave(shost->host_lock, flags);
3304         list_del(&vport->peers);
3305         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3306         fc_host->npiv_vports_inuse--;
3307         spin_unlock_irqrestore(shost->host_lock, flags);
3308         put_device(dev->parent);
3309         kfree(vport);
3310
3311         return error;
3312 }
3313
3314 /**
3315  * fc_vport_create - Admin App or LLDD requests creation of a vport
3316  * @shost:      scsi host the virtual port is connected to.
3317  * @channel:    channel on shost port connected to.
3318  * @ids:        The world wide names, FC4 port roles, etc for
3319  *              the virtual port.
3320  *
3321  * Notes:
3322  *      This routine assumes no locks are held on entry.
3323  */
3324 struct fc_vport *
3325 fc_vport_create(struct Scsi_Host *shost, int channel,
3326         struct fc_vport_identifiers *ids)
3327 {
3328         int stat;
3329         struct fc_vport *vport;
3330
3331         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3332                  ids, &vport);
3333         return stat ? NULL : vport;
3334 }
3335 EXPORT_SYMBOL(fc_vport_create);
3336
3337 /**
3338  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3339  * @vport:      fc_vport to be terminated
3340  *
3341  * Calls the LLDD vport_delete() function, then deallocates and removes
3342  * the vport from the shost and object tree.
3343  *
3344  * Notes:
3345  *      This routine assumes no locks are held on entry.
3346  */
3347 int
3348 fc_vport_terminate(struct fc_vport *vport)
3349 {
3350         struct Scsi_Host *shost = vport_to_shost(vport);
3351         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3352         struct fc_internal *i = to_fc_internal(shost->transportt);
3353         struct device *dev = &vport->dev;
3354         unsigned long flags;
3355         int stat;
3356
3357         spin_lock_irqsave(shost->host_lock, flags);
3358         if (vport->flags & FC_VPORT_CREATING) {
3359                 spin_unlock_irqrestore(shost->host_lock, flags);
3360                 return -EBUSY;
3361         }
3362         if (vport->flags & (FC_VPORT_DEL)) {
3363                 spin_unlock_irqrestore(shost->host_lock, flags);
3364                 return -EALREADY;
3365         }
3366         vport->flags |= FC_VPORT_DELETING;
3367         spin_unlock_irqrestore(shost->host_lock, flags);
3368
3369         if (i->f->vport_delete)
3370                 stat = i->f->vport_delete(vport);
3371         else
3372                 stat = -ENOENT;
3373
3374         spin_lock_irqsave(shost->host_lock, flags);
3375         vport->flags &= ~FC_VPORT_DELETING;
3376         if (!stat) {
3377                 vport->flags |= FC_VPORT_DELETED;
3378                 list_del(&vport->peers);
3379                 fc_host->npiv_vports_inuse--;
3380                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3381         }
3382         spin_unlock_irqrestore(shost->host_lock, flags);
3383
3384         if (stat)
3385                 return stat;
3386
3387         if (dev->parent != &shost->shost_gendev)
3388                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3389         transport_remove_device(dev);
3390         device_del(dev);
3391         transport_destroy_device(dev);
3392
3393         /*
3394          * Removing our self-reference should mean our
3395          * release function gets called, which will drop the remaining
3396          * parent reference and free the data structure.
3397          */
3398         put_device(dev);                        /* for self-reference */
3399
3400         return 0; /* SUCCESS */
3401 }
3402 EXPORT_SYMBOL(fc_vport_terminate);
3403
3404 /**
3405  * fc_vport_sched_delete - workq-based delete request for a vport
3406  * @work:       vport to be deleted.
3407  */
3408 static void
3409 fc_vport_sched_delete(struct work_struct *work)
3410 {
3411         struct fc_vport *vport =
3412                 container_of(work, struct fc_vport, vport_delete_work);
3413         int stat;
3414
3415         stat = fc_vport_terminate(vport);
3416         if (stat)
3417                 dev_printk(KERN_ERR, vport->dev.parent,
3418                         "%s: %s could not be deleted created via "
3419                         "shost%d channel %d - error %d\n", __func__,
3420                         dev_name(&vport->dev), vport->shost->host_no,
3421                         vport->channel, stat);
3422 }
3423
3424
3425 /*
3426  * BSG support
3427  */
3428
3429
3430 /**
3431  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3432  * @job:        fc_bsg_job that is to be torn down
3433  */
3434 static void
3435 fc_destroy_bsgjob(struct fc_bsg_job *job)
3436 {
3437         unsigned long flags;
3438
3439         spin_lock_irqsave(&job->job_lock, flags);
3440         if (job->ref_cnt) {
3441                 spin_unlock_irqrestore(&job->job_lock, flags);
3442                 return;
3443         }
3444         spin_unlock_irqrestore(&job->job_lock, flags);
3445
3446         put_device(job->dev);   /* release reference for the request */
3447
3448         kfree(job->request_payload.sg_list);
3449         kfree(job->reply_payload.sg_list);
3450         kfree(job);
3451 }
3452
3453 /**
3454  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3455  *                  completed
3456  * @job:        fc_bsg_job that is complete
3457  */
3458 static void
3459 fc_bsg_jobdone(struct fc_bsg_job *job)
3460 {
3461         struct request *req = job->req;
3462         struct request *rsp = req->next_rq;
3463         int err;
3464
3465         err = job->req->errors = job->reply->result;
3466
3467         if (err < 0)
3468                 /* we're only returning the result field in the reply */
3469                 job->req->sense_len = sizeof(uint32_t);
3470         else
3471                 job->req->sense_len = job->reply_len;
3472
3473         /* we assume all request payload was transferred, residual == 0 */
3474         req->resid_len = 0;
3475
3476         if (rsp) {
3477                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3478
3479                 /* set reply (bidi) residual */
3480                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3481                                       rsp->resid_len);
3482         }
3483         blk_complete_request(req);
3484 }
3485
3486 /**
3487  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3488  * @rq:        BSG request that holds the job to be destroyed
3489  */
3490 static void fc_bsg_softirq_done(struct request *rq)
3491 {
3492         struct fc_bsg_job *job = rq->special;
3493         unsigned long flags;
3494
3495         spin_lock_irqsave(&job->job_lock, flags);
3496         job->state_flags |= FC_RQST_STATE_DONE;
3497         job->ref_cnt--;
3498         spin_unlock_irqrestore(&job->job_lock, flags);
3499
3500         blk_end_request_all(rq, rq->errors);
3501         fc_destroy_bsgjob(job);
3502 }
3503
3504 /**
3505  * fc_bsg_job_timeout - handler for when a bsg request timesout
3506  * @req:        request that timed out
3507  */
3508 static enum blk_eh_timer_return
3509 fc_bsg_job_timeout(struct request *req)
3510 {
3511         struct fc_bsg_job *job = (void *) req->special;
3512         struct Scsi_Host *shost = job->shost;
3513         struct fc_internal *i = to_fc_internal(shost->transportt);
3514         unsigned long flags;
3515         int err = 0, done = 0;
3516
3517         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3518                 return BLK_EH_RESET_TIMER;
3519
3520         spin_lock_irqsave(&job->job_lock, flags);
3521         if (job->state_flags & FC_RQST_STATE_DONE)
3522                 done = 1;
3523         else
3524                 job->ref_cnt++;
3525         spin_unlock_irqrestore(&job->job_lock, flags);
3526
3527         if (!done && i->f->bsg_timeout) {
3528                 /* call LLDD to abort the i/o as it has timed out */
3529                 err = i->f->bsg_timeout(job);
3530                 if (err == -EAGAIN) {
3531                         job->ref_cnt--;
3532                         return BLK_EH_RESET_TIMER;
3533                 } else if (err)
3534                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3535                                 "abort failed with status %d\n", err);
3536         }
3537
3538         /* the blk_end_sync_io() doesn't check the error */
3539         if (done)
3540                 return BLK_EH_NOT_HANDLED;
3541         else
3542                 return BLK_EH_HANDLED;
3543 }
3544
3545 static int
3546 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3547 {
3548         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3549
3550         BUG_ON(!req->nr_phys_segments);
3551
3552         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3553         if (!buf->sg_list)
3554                 return -ENOMEM;
3555         sg_init_table(buf->sg_list, req->nr_phys_segments);
3556         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3557         buf->payload_len = blk_rq_bytes(req);
3558         return 0;
3559 }
3560
3561
3562 /**
3563  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3564  *                   bsg request
3565  * @shost:      SCSI Host corresponding to the bsg object
3566  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3567  * @req:        BSG request that needs a job structure
3568  */
3569 static int
3570 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3571         struct request *req)
3572 {
3573         struct fc_internal *i = to_fc_internal(shost->transportt);
3574         struct request *rsp = req->next_rq;
3575         struct fc_bsg_job *job;
3576         int ret;
3577
3578         BUG_ON(req->special);
3579
3580         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3581                         GFP_KERNEL);
3582         if (!job)
3583                 return -ENOMEM;
3584
3585         /*
3586          * Note: this is a bit silly.
3587          * The request gets formatted as a SGIO v4 ioctl request, which
3588          * then gets reformatted as a blk request, which then gets
3589          * reformatted as a fc bsg request. And on completion, we have
3590          * to wrap return results such that SGIO v4 thinks it was a scsi
3591          * status.  I hope this was all worth it.
3592          */
3593
3594         req->special = job;
3595         job->shost = shost;
3596         job->rport = rport;
3597         job->req = req;
3598         if (i->f->dd_bsg_size)
3599                 job->dd_data = (void *)&job[1];
3600         spin_lock_init(&job->job_lock);
3601         job->request = (struct fc_bsg_request *)req->cmd;
3602         job->request_len = req->cmd_len;
3603         job->reply = req->sense;
3604         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3605                                                  * allocated */
3606         if (req->bio) {
3607                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3608                 if (ret)
3609                         goto failjob_rls_job;
3610         }
3611         if (rsp && rsp->bio) {
3612                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3613                 if (ret)
3614                         goto failjob_rls_rqst_payload;
3615         }
3616         job->job_done = fc_bsg_jobdone;
3617         if (rport)
3618                 job->dev = &rport->dev;
3619         else
3620                 job->dev = &shost->shost_gendev;
3621         get_device(job->dev);           /* take a reference for the request */
3622
3623         job->ref_cnt = 1;
3624
3625         return 0;
3626
3627
3628 failjob_rls_rqst_payload:
3629         kfree(job->request_payload.sg_list);
3630 failjob_rls_job:
3631         kfree(job);
3632         return -ENOMEM;
3633 }
3634
3635
3636 enum fc_dispatch_result {
3637         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3638         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3639         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3640 };
3641
3642
3643 /**
3644  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3645  * @q:          fc host request queue
3646  * @shost:      scsi host rport attached to
3647  * @job:        bsg job to be processed
3648  */
3649 static enum fc_dispatch_result
3650 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3651                          struct fc_bsg_job *job)
3652 {
3653         struct fc_internal *i = to_fc_internal(shost->transportt);
3654         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3655         int ret;
3656
3657         /* Validate the host command */
3658         switch (job->request->msgcode) {
3659         case FC_BSG_HST_ADD_RPORT:
3660                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3661                 break;
3662
3663         case FC_BSG_HST_DEL_RPORT:
3664                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3665                 break;
3666
3667         case FC_BSG_HST_ELS_NOLOGIN:
3668                 cmdlen += sizeof(struct fc_bsg_host_els);
3669                 /* there better be a xmt and rcv payloads */
3670                 if ((!job->request_payload.payload_len) ||
3671                     (!job->reply_payload.payload_len)) {
3672                         ret = -EINVAL;
3673                         goto fail_host_msg;
3674                 }
3675                 break;
3676
3677         case FC_BSG_HST_CT:
3678                 cmdlen += sizeof(struct fc_bsg_host_ct);
3679                 /* there better be xmt and rcv payloads */
3680                 if ((!job->request_payload.payload_len) ||
3681                     (!job->reply_payload.payload_len)) {
3682                         ret = -EINVAL;
3683                         goto fail_host_msg;
3684                 }
3685                 break;
3686
3687         case FC_BSG_HST_VENDOR:
3688                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3689                 if ((shost->hostt->vendor_id == 0L) ||
3690                     (job->request->rqst_data.h_vendor.vendor_id !=
3691                         shost->hostt->vendor_id)) {
3692                         ret = -ESRCH;
3693                         goto fail_host_msg;
3694                 }
3695                 break;
3696
3697         default:
3698                 ret = -EBADR;
3699                 goto fail_host_msg;
3700         }
3701
3702         /* check if we really have all the request data needed */
3703         if (job->request_len < cmdlen) {
3704                 ret = -ENOMSG;
3705                 goto fail_host_msg;
3706         }
3707
3708         ret = i->f->bsg_request(job);
3709         if (!ret)
3710                 return FC_DISPATCH_UNLOCKED;
3711
3712 fail_host_msg:
3713         /* return the errno failure code as the only status */
3714         BUG_ON(job->reply_len < sizeof(uint32_t));
3715         job->reply->reply_payload_rcv_len = 0;
3716         job->reply->result = ret;
3717         job->reply_len = sizeof(uint32_t);
3718         fc_bsg_jobdone(job);
3719         return FC_DISPATCH_UNLOCKED;
3720 }
3721
3722
3723 /*
3724  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3725  * @rport:      rport to be restarted
3726  */
3727 static void
3728 fc_bsg_goose_queue(struct fc_rport *rport)
3729 {
3730         int flagset;
3731         unsigned long flags;
3732
3733         if (!rport->rqst_q)
3734                 return;
3735
3736         get_device(&rport->dev);
3737
3738         spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3739         flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3740                   !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3741         if (flagset)
3742                 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3743         __blk_run_queue(rport->rqst_q);
3744         if (flagset)
3745                 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3746         spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3747
3748         put_device(&rport->dev);
3749 }
3750
3751
3752 /**
3753  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3754  * @q:          rport request queue
3755  * @shost:      scsi host rport attached to
3756  * @rport:      rport request destined to
3757  * @job:        bsg job to be processed
3758  */
3759 static enum fc_dispatch_result
3760 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3761                          struct fc_rport *rport, struct fc_bsg_job *job)
3762 {
3763         struct fc_internal *i = to_fc_internal(shost->transportt);
3764         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3765         int ret;
3766
3767         /* Validate the rport command */
3768         switch (job->request->msgcode) {
3769         case FC_BSG_RPT_ELS:
3770                 cmdlen += sizeof(struct fc_bsg_rport_els);
3771                 goto check_bidi;
3772
3773         case FC_BSG_RPT_CT:
3774                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3775 check_bidi:
3776                 /* there better be xmt and rcv payloads */
3777                 if ((!job->request_payload.payload_len) ||
3778                     (!job->reply_payload.payload_len)) {
3779                         ret = -EINVAL;
3780                         goto fail_rport_msg;
3781                 }
3782                 break;
3783         default:
3784                 ret = -EBADR;
3785                 goto fail_rport_msg;
3786         }
3787
3788         /* check if we really have all the request data needed */
3789         if (job->request_len < cmdlen) {
3790                 ret = -ENOMSG;
3791                 goto fail_rport_msg;
3792         }
3793
3794         ret = i->f->bsg_request(job);
3795         if (!ret)
3796                 return FC_DISPATCH_UNLOCKED;
3797
3798 fail_rport_msg:
3799         /* return the errno failure code as the only status */
3800         BUG_ON(job->reply_len < sizeof(uint32_t));
3801         job->reply->reply_payload_rcv_len = 0;
3802         job->reply->result = ret;
3803         job->reply_len = sizeof(uint32_t);
3804         fc_bsg_jobdone(job);
3805         return FC_DISPATCH_UNLOCKED;
3806 }
3807
3808
3809 /**
3810  * fc_bsg_request_handler - generic handler for bsg requests
3811  * @q:          request queue to manage
3812  * @shost:      Scsi_Host related to the bsg object
3813  * @rport:      FC remote port related to the bsg object (optional)
3814  * @dev:        device structure for bsg object
3815  */
3816 static void
3817 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3818                        struct fc_rport *rport, struct device *dev)
3819 {
3820         struct request *req;
3821         struct fc_bsg_job *job;
3822         enum fc_dispatch_result ret;
3823
3824         if (!get_device(dev))
3825                 return;
3826
3827         while (!blk_queue_plugged(q)) {
3828                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3829                     !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3830                         break;
3831
3832                 req = blk_fetch_request(q);
3833                 if (!req)
3834                         break;
3835
3836                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3837                         req->errors = -ENXIO;
3838                         spin_unlock_irq(q->queue_lock);
3839                         blk_end_request(req, -ENXIO, blk_rq_bytes(req));
3840                         spin_lock_irq(q->queue_lock);
3841                         continue;
3842                 }
3843
3844                 spin_unlock_irq(q->queue_lock);
3845
3846                 ret = fc_req_to_bsgjob(shost, rport, req);
3847                 if (ret) {
3848                         req->errors = ret;
3849                         blk_end_request(req, ret, blk_rq_bytes(req));
3850                         spin_lock_irq(q->queue_lock);
3851                         continue;
3852                 }
3853
3854                 job = req->special;
3855
3856                 /* check if we have the msgcode value at least */
3857                 if (job->request_len < sizeof(uint32_t)) {
3858                         BUG_ON(job->reply_len < sizeof(uint32_t));
3859                         job->reply->reply_payload_rcv_len = 0;
3860                         job->reply->result = -ENOMSG;
3861                         job->reply_len = sizeof(uint32_t);
3862                         fc_bsg_jobdone(job);
3863                         spin_lock_irq(q->queue_lock);
3864                         continue;
3865                 }
3866
3867                 /* the dispatch routines will unlock the queue_lock */
3868                 if (rport)
3869                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3870                 else
3871                         ret = fc_bsg_host_dispatch(q, shost, job);
3872
3873                 /* did dispatcher hit state that can't process any more */
3874                 if (ret == FC_DISPATCH_BREAK)
3875                         break;
3876
3877                 /* did dispatcher had released the lock */
3878                 if (ret == FC_DISPATCH_UNLOCKED)
3879                         spin_lock_irq(q->queue_lock);
3880         }
3881
3882         spin_unlock_irq(q->queue_lock);
3883         put_device(dev);
3884         spin_lock_irq(q->queue_lock);
3885 }
3886
3887
3888 /**
3889  * fc_bsg_host_handler - handler for bsg requests for a fc host
3890  * @q:          fc host request queue
3891  */
3892 static void
3893 fc_bsg_host_handler(struct request_queue *q)
3894 {
3895         struct Scsi_Host *shost = q->queuedata;
3896
3897         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3898 }
3899
3900
3901 /**
3902  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3903  * @q:          rport request queue
3904  */
3905 static void
3906 fc_bsg_rport_handler(struct request_queue *q)
3907 {
3908         struct fc_rport *rport = q->queuedata;
3909         struct Scsi_Host *shost = rport_to_shost(rport);
3910
3911         fc_bsg_request_handler(q, shost, rport, &rport->dev);
3912 }
3913
3914
3915 /**
3916  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3917  * @shost:      shost for fc_host
3918  * @fc_host:    fc_host adding the structures to
3919  */
3920 static int
3921 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3922 {
3923         struct device *dev = &shost->shost_gendev;
3924         struct fc_internal *i = to_fc_internal(shost->transportt);
3925         struct request_queue *q;
3926         int err;
3927         char bsg_name[20];
3928
3929         fc_host->rqst_q = NULL;
3930
3931         if (!i->f->bsg_request)
3932                 return -ENOTSUPP;
3933
3934         snprintf(bsg_name, sizeof(bsg_name),
3935                  "fc_host%d", shost->host_no);
3936
3937         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3938         if (!q) {
3939                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3940                                 "initialize - no request queue\n",
3941                                  shost->host_no);
3942                 return -ENOMEM;
3943         }
3944
3945         q->queuedata = shost;
3946         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3947         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3948         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3949         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3950
3951         err = bsg_register_queue(q, dev, bsg_name, NULL);
3952         if (err) {
3953                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3954                                 "initialize - register queue\n",
3955                                 shost->host_no);
3956                 blk_cleanup_queue(q);
3957                 return err;
3958         }
3959
3960         fc_host->rqst_q = q;
3961         return 0;
3962 }
3963
3964
3965 /**
3966  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3967  * @shost:      shost that rport is attached to
3968  * @rport:      rport that the bsg hooks are being attached to
3969  */
3970 static int
3971 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3972 {
3973         struct device *dev = &rport->dev;
3974         struct fc_internal *i = to_fc_internal(shost->transportt);
3975         struct request_queue *q;
3976         int err;
3977
3978         rport->rqst_q = NULL;
3979
3980         if (!i->f->bsg_request)
3981                 return -ENOTSUPP;
3982
3983         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
3984         if (!q) {
3985                 printk(KERN_ERR "%s: bsg interface failed to "
3986                                 "initialize - no request queue\n",
3987                                  dev->kobj.name);
3988                 return -ENOMEM;
3989         }
3990
3991         q->queuedata = rport;
3992         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3993         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3994         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3995         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3996
3997         err = bsg_register_queue(q, dev, NULL, NULL);
3998         if (err) {
3999                 printk(KERN_ERR "%s: bsg interface failed to "
4000                                 "initialize - register queue\n",
4001                                  dev->kobj.name);
4002                 blk_cleanup_queue(q);
4003                 return err;
4004         }
4005
4006         rport->rqst_q = q;
4007         return 0;
4008 }
4009
4010
4011 /**
4012  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4013  * @q:  the request_queue that is to be torn down.
4014  */
4015 static void
4016 fc_bsg_remove(struct request_queue *q)
4017 {
4018         if (q) {
4019                 bsg_unregister_queue(q);
4020                 blk_cleanup_queue(q);
4021         }
4022 }
4023
4024
4025 /* Original Author:  Martin Hicks */
4026 MODULE_AUTHOR("James Smart");
4027 MODULE_DESCRIPTION("FC Transport Attributes");
4028 MODULE_LICENSE("GPL");
4029
4030 module_init(fc_transport_init);
4031 module_exit(fc_transport_exit);