[SCSI] fcoe: fix fcoe module ref counting
[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/slab.h>
31 #include <linux/delay.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi_transport.h>
35 #include <scsi/scsi_transport_fc.h>
36 #include <scsi/scsi_cmnd.h>
37 #include <linux/netlink.h>
38 #include <net/netlink.h>
39 #include <scsi/scsi_netlink_fc.h>
40 #include <scsi/scsi_bsg_fc.h>
41 #include "scsi_priv.h"
42 #include "scsi_transport_fc_internal.h"
43
44 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
45 static void fc_vport_sched_delete(struct work_struct *work);
46 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
47         struct device *pdev, struct fc_vport_identifiers  *ids,
48         struct fc_vport **vport);
49 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
50 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
51 static void fc_bsg_remove(struct request_queue *);
52 static void fc_bsg_goose_queue(struct fc_rport *);
53
54 /*
55  * Redefine so that we can have same named attributes in the
56  * sdev/starget/host objects.
57  */
58 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
59 struct device_attribute device_attr_##_prefix##_##_name =       \
60         __ATTR(_name,_mode,_show,_store)
61
62 #define fc_enum_name_search(title, table_type, table)                   \
63 static const char *get_fc_##title##_name(enum table_type table_key)     \
64 {                                                                       \
65         int i;                                                          \
66         char *name = NULL;                                              \
67                                                                         \
68         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
69                 if (table[i].value == table_key) {                      \
70                         name = table[i].name;                           \
71                         break;                                          \
72                 }                                                       \
73         }                                                               \
74         return name;                                                    \
75 }
76
77 #define fc_enum_name_match(title, table_type, table)                    \
78 static int get_fc_##title##_match(const char *table_key,                \
79                 enum table_type *value)                                 \
80 {                                                                       \
81         int i;                                                          \
82                                                                         \
83         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
84                 if (strncmp(table_key, table[i].name,                   \
85                                 table[i].matchlen) == 0) {              \
86                         *value = table[i].value;                        \
87                         return 0; /* success */                         \
88                 }                                                       \
89         }                                                               \
90         return 1; /* failure */                                         \
91 }
92
93
94 /* Convert fc_port_type values to ascii string name */
95 static struct {
96         enum fc_port_type       value;
97         char                    *name;
98 } fc_port_type_names[] = {
99         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
100         { FC_PORTTYPE_OTHER,            "Other" },
101         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
102         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
103         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
104         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
105         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
106         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
107 };
108 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
109 #define FC_PORTTYPE_MAX_NAMELEN         50
110
111 /* Reuse fc_port_type enum function for vport_type */
112 #define get_fc_vport_type_name get_fc_port_type_name
113
114
115 /* Convert fc_host_event_code values to ascii string name */
116 static const struct {
117         enum fc_host_event_code         value;
118         char                            *name;
119 } fc_host_event_code_names[] = {
120         { FCH_EVT_LIP,                  "lip" },
121         { FCH_EVT_LINKUP,               "link_up" },
122         { FCH_EVT_LINKDOWN,             "link_down" },
123         { FCH_EVT_LIPRESET,             "lip_reset" },
124         { FCH_EVT_RSCN,                 "rscn" },
125         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
126         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
127         { FCH_EVT_PORT_ONLINE,          "port_online" },
128         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
129         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
130         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
131         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
132 };
133 fc_enum_name_search(host_event_code, fc_host_event_code,
134                 fc_host_event_code_names)
135 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
136
137
138 /* Convert fc_port_state values to ascii string name */
139 static struct {
140         enum fc_port_state      value;
141         char                    *name;
142 } fc_port_state_names[] = {
143         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
144         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
145         { FC_PORTSTATE_ONLINE,          "Online" },
146         { FC_PORTSTATE_OFFLINE,         "Offline" },
147         { FC_PORTSTATE_BLOCKED,         "Blocked" },
148         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
149         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
150         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
151         { FC_PORTSTATE_ERROR,           "Error" },
152         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
153         { FC_PORTSTATE_DELETED,         "Deleted" },
154 };
155 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
156 #define FC_PORTSTATE_MAX_NAMELEN        20
157
158
159 /* Convert fc_vport_state values to ascii string name */
160 static struct {
161         enum fc_vport_state     value;
162         char                    *name;
163 } fc_vport_state_names[] = {
164         { FC_VPORT_UNKNOWN,             "Unknown" },
165         { FC_VPORT_ACTIVE,              "Active" },
166         { FC_VPORT_DISABLED,            "Disabled" },
167         { FC_VPORT_LINKDOWN,            "Linkdown" },
168         { FC_VPORT_INITIALIZING,        "Initializing" },
169         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
170         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
171         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
172         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
173         { FC_VPORT_FAILED,              "VPort Failed" },
174 };
175 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
176 #define FC_VPORTSTATE_MAX_NAMELEN       24
177
178 /* Reuse fc_vport_state enum function for vport_last_state */
179 #define get_fc_vport_last_state_name get_fc_vport_state_name
180
181
182 /* Convert fc_tgtid_binding_type values to ascii string name */
183 static const struct {
184         enum fc_tgtid_binding_type      value;
185         char                            *name;
186         int                             matchlen;
187 } fc_tgtid_binding_type_names[] = {
188         { FC_TGTID_BIND_NONE, "none", 4 },
189         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
190         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
191         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
192 };
193 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
194                 fc_tgtid_binding_type_names)
195 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
196                 fc_tgtid_binding_type_names)
197 #define FC_BINDTYPE_MAX_NAMELEN 30
198
199
200 #define fc_bitfield_name_search(title, table)                   \
201 static ssize_t                                                  \
202 get_fc_##title##_names(u32 table_key, char *buf)                \
203 {                                                               \
204         char *prefix = "";                                      \
205         ssize_t len = 0;                                        \
206         int i;                                                  \
207                                                                 \
208         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
209                 if (table[i].value & table_key) {               \
210                         len += sprintf(buf + len, "%s%s",       \
211                                 prefix, table[i].name);         \
212                         prefix = ", ";                          \
213                 }                                               \
214         }                                                       \
215         len += sprintf(buf + len, "\n");                        \
216         return len;                                             \
217 }
218
219
220 /* Convert FC_COS bit values to ascii string name */
221 static const struct {
222         u32                     value;
223         char                    *name;
224 } fc_cos_names[] = {
225         { FC_COS_CLASS1,        "Class 1" },
226         { FC_COS_CLASS2,        "Class 2" },
227         { FC_COS_CLASS3,        "Class 3" },
228         { FC_COS_CLASS4,        "Class 4" },
229         { FC_COS_CLASS6,        "Class 6" },
230 };
231 fc_bitfield_name_search(cos, fc_cos_names)
232
233
234 /* Convert FC_PORTSPEED bit values to ascii string name */
235 static const struct {
236         u32                     value;
237         char                    *name;
238 } fc_port_speed_names[] = {
239         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
240         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
241         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
242         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
243         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
244         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
245         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
246 };
247 fc_bitfield_name_search(port_speed, fc_port_speed_names)
248
249
250 static int
251 show_fc_fc4s (char *buf, u8 *fc4_list)
252 {
253         int i, len=0;
254
255         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
256                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
257         len += sprintf(buf + len, "\n");
258         return len;
259 }
260
261
262 /* Convert FC_PORT_ROLE bit values to ascii string name */
263 static const struct {
264         u32                     value;
265         char                    *name;
266 } fc_port_role_names[] = {
267         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
268         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
269         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
270 };
271 fc_bitfield_name_search(port_roles, fc_port_role_names)
272
273 /*
274  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
275  */
276 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
277 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
278 #define FC_FPORT_PORTID                 0x00000e
279 #define FC_FABCTLR_PORTID               0x00000d
280 #define FC_DIRSRVR_PORTID               0x00000c
281 #define FC_TIMESRVR_PORTID              0x00000b
282 #define FC_MGMTSRVR_PORTID              0x00000a
283
284
285 static void fc_timeout_deleted_rport(struct work_struct *work);
286 static void fc_timeout_fail_rport_io(struct work_struct *work);
287 static void fc_scsi_scan_rport(struct work_struct *work);
288
289 /*
290  * Attribute counts pre object type...
291  * Increase these values if you add attributes
292  */
293 #define FC_STARGET_NUM_ATTRS    3
294 #define FC_RPORT_NUM_ATTRS      10
295 #define FC_VPORT_NUM_ATTRS      9
296 #define FC_HOST_NUM_ATTRS       22
297
298 struct fc_internal {
299         struct scsi_transport_template t;
300         struct fc_function_template *f;
301
302         /*
303          * For attributes : each object has :
304          *   An array of the actual attributes structures
305          *   An array of null-terminated pointers to the attribute
306          *     structures - used for mid-layer interaction.
307          *
308          * The attribute containers for the starget and host are are
309          * part of the midlayer. As the remote port is specific to the
310          * fc transport, we must provide the attribute container.
311          */
312         struct device_attribute private_starget_attrs[
313                                                         FC_STARGET_NUM_ATTRS];
314         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
315
316         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
317         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
318
319         struct transport_container rport_attr_cont;
320         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
321         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
322
323         struct transport_container vport_attr_cont;
324         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
325         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
326 };
327
328 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
329
330 static int fc_target_setup(struct transport_container *tc, struct device *dev,
331                            struct device *cdev)
332 {
333         struct scsi_target *starget = to_scsi_target(dev);
334         struct fc_rport *rport = starget_to_rport(starget);
335
336         /*
337          * if parent is remote port, use values from remote port.
338          * Otherwise, this host uses the fc_transport, but not the
339          * remote port interface. As such, initialize to known non-values.
340          */
341         if (rport) {
342                 fc_starget_node_name(starget) = rport->node_name;
343                 fc_starget_port_name(starget) = rport->port_name;
344                 fc_starget_port_id(starget) = rport->port_id;
345         } else {
346                 fc_starget_node_name(starget) = -1;
347                 fc_starget_port_name(starget) = -1;
348                 fc_starget_port_id(starget) = -1;
349         }
350
351         return 0;
352 }
353
354 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
355                                "fc_transport",
356                                fc_target_setup,
357                                NULL,
358                                NULL);
359
360 static int fc_host_setup(struct transport_container *tc, struct device *dev,
361                          struct device *cdev)
362 {
363         struct Scsi_Host *shost = dev_to_shost(dev);
364         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
365
366         /*
367          * Set default values easily detected by the midlayer as
368          * failure cases.  The scsi lldd is responsible for initializing
369          * all transport attributes to valid values per host.
370          */
371         fc_host->node_name = -1;
372         fc_host->port_name = -1;
373         fc_host->permanent_port_name = -1;
374         fc_host->supported_classes = FC_COS_UNSPECIFIED;
375         memset(fc_host->supported_fc4s, 0,
376                 sizeof(fc_host->supported_fc4s));
377         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
378         fc_host->maxframe_size = -1;
379         fc_host->max_npiv_vports = 0;
380         memset(fc_host->serial_number, 0,
381                 sizeof(fc_host->serial_number));
382
383         fc_host->port_id = -1;
384         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
385         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
386         memset(fc_host->active_fc4s, 0,
387                 sizeof(fc_host->active_fc4s));
388         fc_host->speed = FC_PORTSPEED_UNKNOWN;
389         fc_host->fabric_name = -1;
390         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
391         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
392
393         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
394
395         INIT_LIST_HEAD(&fc_host->rports);
396         INIT_LIST_HEAD(&fc_host->rport_bindings);
397         INIT_LIST_HEAD(&fc_host->vports);
398         fc_host->next_rport_number = 0;
399         fc_host->next_target_id = 0;
400         fc_host->next_vport_number = 0;
401         fc_host->npiv_vports_inuse = 0;
402
403         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
404                  "fc_wq_%d", shost->host_no);
405         fc_host->work_q = create_singlethread_workqueue(
406                                         fc_host->work_q_name);
407         if (!fc_host->work_q)
408                 return -ENOMEM;
409
410         snprintf(fc_host->devloss_work_q_name,
411                  sizeof(fc_host->devloss_work_q_name),
412                  "fc_dl_%d", shost->host_no);
413         fc_host->devloss_work_q = create_singlethread_workqueue(
414                                         fc_host->devloss_work_q_name);
415         if (!fc_host->devloss_work_q) {
416                 destroy_workqueue(fc_host->work_q);
417                 fc_host->work_q = NULL;
418                 return -ENOMEM;
419         }
420
421         fc_bsg_hostadd(shost, fc_host);
422         /* ignore any bsg add error - we just can't do sgio */
423
424         return 0;
425 }
426
427 static int fc_host_remove(struct transport_container *tc, struct device *dev,
428                          struct device *cdev)
429 {
430         struct Scsi_Host *shost = dev_to_shost(dev);
431         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
432
433         fc_bsg_remove(fc_host->rqst_q);
434         return 0;
435 }
436
437 static DECLARE_TRANSPORT_CLASS(fc_host_class,
438                                "fc_host",
439                                fc_host_setup,
440                                fc_host_remove,
441                                NULL);
442
443 /*
444  * Setup and Remove actions for remote ports are handled
445  * in the service functions below.
446  */
447 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
448                                "fc_remote_ports",
449                                NULL,
450                                NULL,
451                                NULL);
452
453 /*
454  * Setup and Remove actions for virtual ports are handled
455  * in the service functions below.
456  */
457 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
458                                "fc_vports",
459                                NULL,
460                                NULL,
461                                NULL);
462
463 /*
464  * Module Parameters
465  */
466
467 /*
468  * dev_loss_tmo: the default number of seconds that the FC transport
469  *   should insulate the loss of a remote port.
470  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
471  */
472 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
473
474 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
475 MODULE_PARM_DESC(dev_loss_tmo,
476                  "Maximum number of seconds that the FC transport should"
477                  " insulate the loss of a remote port. Once this value is"
478                  " exceeded, the scsi target is removed. Value should be"
479                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
480                  " fast_io_fail_tmo is not set.");
481
482 /*
483  * Netlink Infrastructure
484  */
485
486 static atomic_t fc_event_seq;
487
488 /**
489  * fc_get_event_number - Obtain the next sequential FC event number
490  *
491  * Notes:
492  *   We could have inlined this, but it would have required fc_event_seq to
493  *   be exposed. For now, live with the subroutine call.
494  *   Atomic used to avoid lock/unlock...
495  */
496 u32
497 fc_get_event_number(void)
498 {
499         return atomic_add_return(1, &fc_event_seq);
500 }
501 EXPORT_SYMBOL(fc_get_event_number);
502
503
504 /**
505  * fc_host_post_event - called to post an even on an fc_host.
506  * @shost:              host the event occurred on
507  * @event_number:       fc event number obtained from get_fc_event_number()
508  * @event_code:         fc_host event being posted
509  * @event_data:         32bits of data for the event being posted
510  *
511  * Notes:
512  *      This routine assumes no locks are held on entry.
513  */
514 void
515 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
516                 enum fc_host_event_code event_code, u32 event_data)
517 {
518         struct sk_buff *skb;
519         struct nlmsghdr *nlh;
520         struct fc_nl_event *event;
521         const char *name;
522         u32 len, skblen;
523         int err;
524
525         if (!scsi_nl_sock) {
526                 err = -ENOENT;
527                 goto send_fail;
528         }
529
530         len = FC_NL_MSGALIGN(sizeof(*event));
531         skblen = NLMSG_SPACE(len);
532
533         skb = alloc_skb(skblen, GFP_KERNEL);
534         if (!skb) {
535                 err = -ENOBUFS;
536                 goto send_fail;
537         }
538
539         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
540                                 skblen - sizeof(*nlh), 0);
541         if (!nlh) {
542                 err = -ENOBUFS;
543                 goto send_fail_skb;
544         }
545         event = NLMSG_DATA(nlh);
546
547         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
548                                 FC_NL_ASYNC_EVENT, len);
549         event->seconds = get_seconds();
550         event->vendor_id = 0;
551         event->host_no = shost->host_no;
552         event->event_datalen = sizeof(u32);     /* bytes */
553         event->event_num = event_number;
554         event->event_code = event_code;
555         event->event_data = event_data;
556
557         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
558                         GFP_KERNEL);
559         return;
560
561 send_fail_skb:
562         kfree_skb(skb);
563 send_fail:
564         name = get_fc_host_event_code_name(event_code);
565         printk(KERN_WARNING
566                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
567                 __func__, shost->host_no,
568                 (name) ? name : "<unknown>", event_data, err);
569         return;
570 }
571 EXPORT_SYMBOL(fc_host_post_event);
572
573
574 /**
575  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
576  * @shost:              host the event occurred on
577  * @event_number:       fc event number obtained from get_fc_event_number()
578  * @data_len:           amount, in bytes, of vendor unique data
579  * @data_buf:           pointer to vendor unique data
580  * @vendor_id:          Vendor id
581  *
582  * Notes:
583  *      This routine assumes no locks are held on entry.
584  */
585 void
586 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
587                 u32 data_len, char * data_buf, u64 vendor_id)
588 {
589         struct sk_buff *skb;
590         struct nlmsghdr *nlh;
591         struct fc_nl_event *event;
592         u32 len, skblen;
593         int err;
594
595         if (!scsi_nl_sock) {
596                 err = -ENOENT;
597                 goto send_vendor_fail;
598         }
599
600         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
601         skblen = NLMSG_SPACE(len);
602
603         skb = alloc_skb(skblen, GFP_KERNEL);
604         if (!skb) {
605                 err = -ENOBUFS;
606                 goto send_vendor_fail;
607         }
608
609         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
610                                 skblen - sizeof(*nlh), 0);
611         if (!nlh) {
612                 err = -ENOBUFS;
613                 goto send_vendor_fail_skb;
614         }
615         event = NLMSG_DATA(nlh);
616
617         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
618                                 FC_NL_ASYNC_EVENT, len);
619         event->seconds = get_seconds();
620         event->vendor_id = vendor_id;
621         event->host_no = shost->host_no;
622         event->event_datalen = data_len;        /* bytes */
623         event->event_num = event_number;
624         event->event_code = FCH_EVT_VENDOR_UNIQUE;
625         memcpy(&event->event_data, data_buf, data_len);
626
627         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
628                         GFP_KERNEL);
629         return;
630
631 send_vendor_fail_skb:
632         kfree_skb(skb);
633 send_vendor_fail:
634         printk(KERN_WARNING
635                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
636                 __func__, shost->host_no, err);
637         return;
638 }
639 EXPORT_SYMBOL(fc_host_post_vendor_event);
640
641
642
643 static __init int fc_transport_init(void)
644 {
645         int error;
646
647         atomic_set(&fc_event_seq, 0);
648
649         error = transport_class_register(&fc_host_class);
650         if (error)
651                 return error;
652         error = transport_class_register(&fc_vport_class);
653         if (error)
654                 goto unreg_host_class;
655         error = transport_class_register(&fc_rport_class);
656         if (error)
657                 goto unreg_vport_class;
658         error = transport_class_register(&fc_transport_class);
659         if (error)
660                 goto unreg_rport_class;
661         return 0;
662
663 unreg_rport_class:
664         transport_class_unregister(&fc_rport_class);
665 unreg_vport_class:
666         transport_class_unregister(&fc_vport_class);
667 unreg_host_class:
668         transport_class_unregister(&fc_host_class);
669         return error;
670 }
671
672 static void __exit fc_transport_exit(void)
673 {
674         transport_class_unregister(&fc_transport_class);
675         transport_class_unregister(&fc_rport_class);
676         transport_class_unregister(&fc_host_class);
677         transport_class_unregister(&fc_vport_class);
678 }
679
680 /*
681  * FC Remote Port Attribute Management
682  */
683
684 #define fc_rport_show_function(field, format_string, sz, cast)          \
685 static ssize_t                                                          \
686 show_fc_rport_##field (struct device *dev,                              \
687                        struct device_attribute *attr, char *buf)        \
688 {                                                                       \
689         struct fc_rport *rport = transport_class_to_rport(dev);         \
690         struct Scsi_Host *shost = rport_to_shost(rport);                \
691         struct fc_internal *i = to_fc_internal(shost->transportt);      \
692         if ((i->f->get_rport_##field) &&                                \
693             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
694               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
695               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
696                 i->f->get_rport_##field(rport);                         \
697         return snprintf(buf, sz, format_string, cast rport->field);     \
698 }
699
700 #define fc_rport_store_function(field)                                  \
701 static ssize_t                                                          \
702 store_fc_rport_##field(struct device *dev,                              \
703                        struct device_attribute *attr,                   \
704                        const char *buf, size_t count)                   \
705 {                                                                       \
706         int val;                                                        \
707         struct fc_rport *rport = transport_class_to_rport(dev);         \
708         struct Scsi_Host *shost = rport_to_shost(rport);                \
709         struct fc_internal *i = to_fc_internal(shost->transportt);      \
710         char *cp;                                                       \
711         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
712             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
713             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
714                 return -EBUSY;                                          \
715         val = simple_strtoul(buf, &cp, 0);                              \
716         if (*cp && (*cp != '\n'))                                       \
717                 return -EINVAL;                                         \
718         i->f->set_rport_##field(rport, val);                            \
719         return count;                                                   \
720 }
721
722 #define fc_rport_rd_attr(field, format_string, sz)                      \
723         fc_rport_show_function(field, format_string, sz, )              \
724 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
725                          show_fc_rport_##field, NULL)
726
727 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
728         fc_rport_show_function(field, format_string, sz, (cast))        \
729 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
730                           show_fc_rport_##field, NULL)
731
732 #define fc_rport_rw_attr(field, format_string, sz)                      \
733         fc_rport_show_function(field, format_string, sz, )              \
734         fc_rport_store_function(field)                                  \
735 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
736                         show_fc_rport_##field,                          \
737                         store_fc_rport_##field)
738
739
740 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
741 static ssize_t                                                          \
742 show_fc_rport_##field (struct device *dev,                              \
743                        struct device_attribute *attr, char *buf)        \
744 {                                                                       \
745         struct fc_rport *rport = transport_class_to_rport(dev);         \
746         return snprintf(buf, sz, format_string, cast rport->field);     \
747 }
748
749 #define fc_private_rport_rd_attr(field, format_string, sz)              \
750         fc_private_rport_show_function(field, format_string, sz, )      \
751 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
752                          show_fc_rport_##field, NULL)
753
754 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
755         fc_private_rport_show_function(field, format_string, sz, (cast)) \
756 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
757                           show_fc_rport_##field, NULL)
758
759
760 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
761 static ssize_t                                                          \
762 show_fc_rport_##title (struct device *dev,                              \
763                        struct device_attribute *attr, char *buf)        \
764 {                                                                       \
765         struct fc_rport *rport = transport_class_to_rport(dev);         \
766         const char *name;                                               \
767         name = get_fc_##title##_name(rport->title);                     \
768         if (!name)                                                      \
769                 return -EINVAL;                                         \
770         return snprintf(buf, maxlen, "%s\n", name);                     \
771 }                                                                       \
772 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
773                         show_fc_rport_##title, NULL)
774
775
776 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
777         i->private_rport_attrs[count] = device_attr_rport_##field; \
778         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
779         i->private_rport_attrs[count].store = NULL;                     \
780         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
781         if (i->f->show_rport_##field)                                   \
782                 count++
783
784 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
785         i->private_rport_attrs[count] = device_attr_rport_##field; \
786         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
787         i->private_rport_attrs[count].store = NULL;                     \
788         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
789         count++
790
791 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
792         i->private_rport_attrs[count] = device_attr_rport_##field; \
793         if (!i->f->set_rport_##field) {                                 \
794                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
795                 i->private_rport_attrs[count].store = NULL;             \
796         }                                                               \
797         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
798         if (i->f->show_rport_##field)                                   \
799                 count++
800
801 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
802 {                                                                       \
803         i->private_rport_attrs[count] = device_attr_rport_##field; \
804         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
805         count++;                                                        \
806 }
807
808
809 /* The FC Transport Remote Port Attributes: */
810
811 /* Fixed Remote Port Attributes */
812
813 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
814
815 static ssize_t
816 show_fc_rport_supported_classes (struct device *dev,
817                                  struct device_attribute *attr, char *buf)
818 {
819         struct fc_rport *rport = transport_class_to_rport(dev);
820         if (rport->supported_classes == FC_COS_UNSPECIFIED)
821                 return snprintf(buf, 20, "unspecified\n");
822         return get_fc_cos_names(rport->supported_classes, buf);
823 }
824 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
825                 show_fc_rport_supported_classes, NULL);
826
827 /* Dynamic Remote Port Attributes */
828
829 /*
830  * dev_loss_tmo attribute
831  */
832 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
833 static ssize_t
834 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
835                             const char *buf, size_t count)
836 {
837         unsigned long val;
838         struct fc_rport *rport = transport_class_to_rport(dev);
839         struct Scsi_Host *shost = rport_to_shost(rport);
840         struct fc_internal *i = to_fc_internal(shost->transportt);
841         char *cp;
842         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
843             (rport->port_state == FC_PORTSTATE_DELETED) ||
844             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
845                 return -EBUSY;
846         val = simple_strtoul(buf, &cp, 0);
847         if ((*cp && (*cp != '\n')) || (val < 0))
848                 return -EINVAL;
849
850         /*
851          * Check for overflow; dev_loss_tmo is u32
852          */
853         if (val > UINT_MAX)
854                 return -EINVAL;
855
856         /*
857          * If fast_io_fail is off we have to cap
858          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
859          */
860         if (rport->fast_io_fail_tmo == -1 &&
861             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
862                 return -EINVAL;
863
864         i->f->set_rport_dev_loss_tmo(rport, val);
865         return count;
866 }
867 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
868                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
869
870
871 /* Private Remote Port Attributes */
872
873 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
874 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
875 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
876
877 static ssize_t
878 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
879                      char *buf)
880 {
881         struct fc_rport *rport = transport_class_to_rport(dev);
882
883         /* identify any roles that are port_id specific */
884         if ((rport->port_id != -1) &&
885             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
886                                         FC_WELLKNOWN_PORTID_MASK) {
887                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
888                 case FC_FPORT_PORTID:
889                         return snprintf(buf, 30, "Fabric Port\n");
890                 case FC_FABCTLR_PORTID:
891                         return snprintf(buf, 30, "Fabric Controller\n");
892                 case FC_DIRSRVR_PORTID:
893                         return snprintf(buf, 30, "Directory Server\n");
894                 case FC_TIMESRVR_PORTID:
895                         return snprintf(buf, 30, "Time Server\n");
896                 case FC_MGMTSRVR_PORTID:
897                         return snprintf(buf, 30, "Management Server\n");
898                 default:
899                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
900                 }
901         } else {
902                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
903                         return snprintf(buf, 20, "unknown\n");
904                 return get_fc_port_roles_names(rport->roles, buf);
905         }
906 }
907 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
908                 show_fc_rport_roles, NULL);
909
910 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
911 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
912
913 /*
914  * fast_io_fail_tmo attribute
915  */
916 static ssize_t
917 show_fc_rport_fast_io_fail_tmo (struct device *dev,
918                                 struct device_attribute *attr, char *buf)
919 {
920         struct fc_rport *rport = transport_class_to_rport(dev);
921
922         if (rport->fast_io_fail_tmo == -1)
923                 return snprintf(buf, 5, "off\n");
924         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
925 }
926
927 static ssize_t
928 store_fc_rport_fast_io_fail_tmo(struct device *dev,
929                                 struct device_attribute *attr, const char *buf,
930                                 size_t count)
931 {
932         int val;
933         char *cp;
934         struct fc_rport *rport = transport_class_to_rport(dev);
935
936         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
937             (rport->port_state == FC_PORTSTATE_DELETED) ||
938             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
939                 return -EBUSY;
940         if (strncmp(buf, "off", 3) == 0)
941                 rport->fast_io_fail_tmo = -1;
942         else {
943                 val = simple_strtoul(buf, &cp, 0);
944                 if ((*cp && (*cp != '\n')) || (val < 0))
945                         return -EINVAL;
946                 /*
947                  * Cap fast_io_fail by dev_loss_tmo or
948                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
949                  */
950                 if ((val >= rport->dev_loss_tmo) ||
951                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
952                         return -EINVAL;
953
954                 rport->fast_io_fail_tmo = val;
955         }
956         return count;
957 }
958 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
959         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
960
961
962 /*
963  * FC SCSI Target Attribute Management
964  */
965
966 /*
967  * Note: in the target show function we recognize when the remote
968  *  port is in the heirarchy and do not allow the driver to get
969  *  involved in sysfs functions. The driver only gets involved if
970  *  it's the "old" style that doesn't use rports.
971  */
972 #define fc_starget_show_function(field, format_string, sz, cast)        \
973 static ssize_t                                                          \
974 show_fc_starget_##field (struct device *dev,                            \
975                          struct device_attribute *attr, char *buf)      \
976 {                                                                       \
977         struct scsi_target *starget = transport_class_to_starget(dev);  \
978         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
979         struct fc_internal *i = to_fc_internal(shost->transportt);      \
980         struct fc_rport *rport = starget_to_rport(starget);             \
981         if (rport)                                                      \
982                 fc_starget_##field(starget) = rport->field;             \
983         else if (i->f->get_starget_##field)                             \
984                 i->f->get_starget_##field(starget);                     \
985         return snprintf(buf, sz, format_string,                         \
986                 cast fc_starget_##field(starget));                      \
987 }
988
989 #define fc_starget_rd_attr(field, format_string, sz)                    \
990         fc_starget_show_function(field, format_string, sz, )            \
991 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
992                          show_fc_starget_##field, NULL)
993
994 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
995         fc_starget_show_function(field, format_string, sz, (cast))      \
996 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
997                           show_fc_starget_##field, NULL)
998
999 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
1000         i->private_starget_attrs[count] = device_attr_starget_##field; \
1001         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
1002         i->private_starget_attrs[count].store = NULL;                   \
1003         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1004         if (i->f->show_starget_##field)                                 \
1005                 count++
1006
1007 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1008         i->private_starget_attrs[count] = device_attr_starget_##field; \
1009         if (!i->f->set_starget_##field) {                               \
1010                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1011                 i->private_starget_attrs[count].store = NULL;           \
1012         }                                                               \
1013         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1014         if (i->f->show_starget_##field)                                 \
1015                 count++
1016
1017 /* The FC Transport SCSI Target Attributes: */
1018 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1019 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1020 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1021
1022
1023 /*
1024  * FC Virtual Port Attribute Management
1025  */
1026
1027 #define fc_vport_show_function(field, format_string, sz, cast)          \
1028 static ssize_t                                                          \
1029 show_fc_vport_##field (struct device *dev,                              \
1030                        struct device_attribute *attr, char *buf)        \
1031 {                                                                       \
1032         struct fc_vport *vport = transport_class_to_vport(dev);         \
1033         struct Scsi_Host *shost = vport_to_shost(vport);                \
1034         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1035         if ((i->f->get_vport_##field) &&                                \
1036             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1037                 i->f->get_vport_##field(vport);                         \
1038         return snprintf(buf, sz, format_string, cast vport->field);     \
1039 }
1040
1041 #define fc_vport_store_function(field)                                  \
1042 static ssize_t                                                          \
1043 store_fc_vport_##field(struct device *dev,                              \
1044                        struct device_attribute *attr,                   \
1045                        const char *buf, size_t count)                   \
1046 {                                                                       \
1047         int val;                                                        \
1048         struct fc_vport *vport = transport_class_to_vport(dev);         \
1049         struct Scsi_Host *shost = vport_to_shost(vport);                \
1050         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1051         char *cp;                                                       \
1052         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1053                 return -EBUSY;                                          \
1054         val = simple_strtoul(buf, &cp, 0);                              \
1055         if (*cp && (*cp != '\n'))                                       \
1056                 return -EINVAL;                                         \
1057         i->f->set_vport_##field(vport, val);                            \
1058         return count;                                                   \
1059 }
1060
1061 #define fc_vport_store_str_function(field, slen)                        \
1062 static ssize_t                                                          \
1063 store_fc_vport_##field(struct device *dev,                              \
1064                        struct device_attribute *attr,                   \
1065                        const char *buf, size_t count)                   \
1066 {                                                                       \
1067         struct fc_vport *vport = transport_class_to_vport(dev);         \
1068         struct Scsi_Host *shost = vport_to_shost(vport);                \
1069         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1070         unsigned int cnt=count;                                         \
1071                                                                         \
1072         /* count may include a LF at end of string */                   \
1073         if (buf[cnt-1] == '\n')                                         \
1074                 cnt--;                                                  \
1075         if (cnt > ((slen) - 1))                                         \
1076                 return -EINVAL;                                         \
1077         memcpy(vport->field, buf, cnt);                                 \
1078         i->f->set_vport_##field(vport);                                 \
1079         return count;                                                   \
1080 }
1081
1082 #define fc_vport_rd_attr(field, format_string, sz)                      \
1083         fc_vport_show_function(field, format_string, sz, )              \
1084 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1085                          show_fc_vport_##field, NULL)
1086
1087 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1088         fc_vport_show_function(field, format_string, sz, (cast))        \
1089 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1090                           show_fc_vport_##field, NULL)
1091
1092 #define fc_vport_rw_attr(field, format_string, sz)                      \
1093         fc_vport_show_function(field, format_string, sz, )              \
1094         fc_vport_store_function(field)                                  \
1095 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1096                         show_fc_vport_##field,                          \
1097                         store_fc_vport_##field)
1098
1099 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1100 static ssize_t                                                          \
1101 show_fc_vport_##field (struct device *dev,                              \
1102                        struct device_attribute *attr, char *buf)        \
1103 {                                                                       \
1104         struct fc_vport *vport = transport_class_to_vport(dev);         \
1105         return snprintf(buf, sz, format_string, cast vport->field);     \
1106 }
1107
1108 #define fc_private_vport_store_u32_function(field)                      \
1109 static ssize_t                                                          \
1110 store_fc_vport_##field(struct device *dev,                              \
1111                        struct device_attribute *attr,                   \
1112                        const char *buf, size_t count)                   \
1113 {                                                                       \
1114         u32 val;                                                        \
1115         struct fc_vport *vport = transport_class_to_vport(dev);         \
1116         char *cp;                                                       \
1117         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1118                 return -EBUSY;                                          \
1119         val = simple_strtoul(buf, &cp, 0);                              \
1120         if (*cp && (*cp != '\n'))                                       \
1121                 return -EINVAL;                                         \
1122         vport->field = val;                                             \
1123         return count;                                                   \
1124 }
1125
1126
1127 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1128         fc_private_vport_show_function(field, format_string, sz, )      \
1129 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1130                          show_fc_vport_##field, NULL)
1131
1132 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1133         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1134 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1135                           show_fc_vport_##field, NULL)
1136
1137 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1138         fc_private_vport_show_function(field, format_string, sz, )      \
1139         fc_private_vport_store_u32_function(field)                      \
1140 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1141                         show_fc_vport_##field,                          \
1142                         store_fc_vport_##field)
1143
1144
1145 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1146 static ssize_t                                                          \
1147 show_fc_vport_##title (struct device *dev,                              \
1148                        struct device_attribute *attr,                   \
1149                        char *buf)                                       \
1150 {                                                                       \
1151         struct fc_vport *vport = transport_class_to_vport(dev);         \
1152         const char *name;                                               \
1153         name = get_fc_##title##_name(vport->title);                     \
1154         if (!name)                                                      \
1155                 return -EINVAL;                                         \
1156         return snprintf(buf, maxlen, "%s\n", name);                     \
1157 }                                                                       \
1158 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1159                         show_fc_vport_##title, NULL)
1160
1161
1162 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1163         i->private_vport_attrs[count] = device_attr_vport_##field; \
1164         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1165         i->private_vport_attrs[count].store = NULL;                     \
1166         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1167         if (i->f->get_##field)                                          \
1168                 count++
1169         /* NOTE: Above MACRO differs: checks function not show bit */
1170
1171 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1172         i->private_vport_attrs[count] = device_attr_vport_##field; \
1173         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1174         i->private_vport_attrs[count].store = NULL;                     \
1175         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1176         count++
1177
1178 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1179         i->private_vport_attrs[count] = device_attr_vport_##field; \
1180         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1181         if (i->f->field)                                                \
1182                 count++
1183         /* NOTE: Above MACRO differs: checks function */
1184
1185 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1186         i->private_vport_attrs[count] = device_attr_vport_##field; \
1187         if (!i->f->set_vport_##field) {                                 \
1188                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1189                 i->private_vport_attrs[count].store = NULL;             \
1190         }                                                               \
1191         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1192         count++
1193         /* NOTE: Above MACRO differs: does not check show bit */
1194
1195 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1196 {                                                                       \
1197         i->private_vport_attrs[count] = device_attr_vport_##field; \
1198         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1199         count++;                                                        \
1200 }
1201
1202
1203 /* The FC Transport Virtual Port Attributes: */
1204
1205 /* Fixed Virtual Port Attributes */
1206
1207 /* Dynamic Virtual Port Attributes */
1208
1209 /* Private Virtual Port Attributes */
1210
1211 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1212 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1213 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1214 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1215
1216 static ssize_t
1217 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1218                      char *buf)
1219 {
1220         struct fc_vport *vport = transport_class_to_vport(dev);
1221
1222         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1223                 return snprintf(buf, 20, "unknown\n");
1224         return get_fc_port_roles_names(vport->roles, buf);
1225 }
1226 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1227
1228 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1229
1230 fc_private_vport_show_function(symbolic_name, "%s\n",
1231                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1232 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1233 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1234                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1235
1236 static ssize_t
1237 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1238                       const char *buf, size_t count)
1239 {
1240         struct fc_vport *vport = transport_class_to_vport(dev);
1241         struct Scsi_Host *shost = vport_to_shost(vport);
1242         unsigned long flags;
1243
1244         spin_lock_irqsave(shost->host_lock, flags);
1245         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1246                 spin_unlock_irqrestore(shost->host_lock, flags);
1247                 return -EBUSY;
1248         }
1249         vport->flags |= FC_VPORT_DELETING;
1250         spin_unlock_irqrestore(shost->host_lock, flags);
1251
1252         fc_queue_work(shost, &vport->vport_delete_work);
1253         return count;
1254 }
1255 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1256                         NULL, store_fc_vport_delete);
1257
1258
1259 /*
1260  * Enable/Disable vport
1261  *  Write "1" to disable, write "0" to enable
1262  */
1263 static ssize_t
1264 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1265                        const char *buf,
1266                            size_t count)
1267 {
1268         struct fc_vport *vport = transport_class_to_vport(dev);
1269         struct Scsi_Host *shost = vport_to_shost(vport);
1270         struct fc_internal *i = to_fc_internal(shost->transportt);
1271         int stat;
1272
1273         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1274                 return -EBUSY;
1275
1276         if (*buf == '0') {
1277                 if (vport->vport_state != FC_VPORT_DISABLED)
1278                         return -EALREADY;
1279         } else if (*buf == '1') {
1280                 if (vport->vport_state == FC_VPORT_DISABLED)
1281                         return -EALREADY;
1282         } else
1283                 return -EINVAL;
1284
1285         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1286         return stat ? stat : count;
1287 }
1288 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1289                         NULL, store_fc_vport_disable);
1290
1291
1292 /*
1293  * Host Attribute Management
1294  */
1295
1296 #define fc_host_show_function(field, format_string, sz, cast)           \
1297 static ssize_t                                                          \
1298 show_fc_host_##field (struct device *dev,                               \
1299                       struct device_attribute *attr, char *buf)         \
1300 {                                                                       \
1301         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1302         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1303         if (i->f->get_host_##field)                                     \
1304                 i->f->get_host_##field(shost);                          \
1305         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1306 }
1307
1308 #define fc_host_store_function(field)                                   \
1309 static ssize_t                                                          \
1310 store_fc_host_##field(struct device *dev,                               \
1311                       struct device_attribute *attr,                    \
1312                       const char *buf,  size_t count)                   \
1313 {                                                                       \
1314         int val;                                                        \
1315         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1316         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1317         char *cp;                                                       \
1318                                                                         \
1319         val = simple_strtoul(buf, &cp, 0);                              \
1320         if (*cp && (*cp != '\n'))                                       \
1321                 return -EINVAL;                                         \
1322         i->f->set_host_##field(shost, val);                             \
1323         return count;                                                   \
1324 }
1325
1326 #define fc_host_store_str_function(field, slen)                         \
1327 static ssize_t                                                          \
1328 store_fc_host_##field(struct device *dev,                               \
1329                       struct device_attribute *attr,                    \
1330                       const char *buf, size_t count)                    \
1331 {                                                                       \
1332         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1333         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1334         unsigned int cnt=count;                                         \
1335                                                                         \
1336         /* count may include a LF at end of string */                   \
1337         if (buf[cnt-1] == '\n')                                         \
1338                 cnt--;                                                  \
1339         if (cnt > ((slen) - 1))                                         \
1340                 return -EINVAL;                                         \
1341         memcpy(fc_host_##field(shost), buf, cnt);                       \
1342         i->f->set_host_##field(shost);                                  \
1343         return count;                                                   \
1344 }
1345
1346 #define fc_host_rd_attr(field, format_string, sz)                       \
1347         fc_host_show_function(field, format_string, sz, )               \
1348 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1349                          show_fc_host_##field, NULL)
1350
1351 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1352         fc_host_show_function(field, format_string, sz, (cast))         \
1353 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1354                           show_fc_host_##field, NULL)
1355
1356 #define fc_host_rw_attr(field, format_string, sz)                       \
1357         fc_host_show_function(field, format_string, sz, )               \
1358         fc_host_store_function(field)                                   \
1359 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1360                         show_fc_host_##field,                           \
1361                         store_fc_host_##field)
1362
1363 #define fc_host_rd_enum_attr(title, maxlen)                             \
1364 static ssize_t                                                          \
1365 show_fc_host_##title (struct device *dev,                               \
1366                       struct device_attribute *attr, char *buf)         \
1367 {                                                                       \
1368         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1369         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1370         const char *name;                                               \
1371         if (i->f->get_host_##title)                                     \
1372                 i->f->get_host_##title(shost);                          \
1373         name = get_fc_##title##_name(fc_host_##title(shost));           \
1374         if (!name)                                                      \
1375                 return -EINVAL;                                         \
1376         return snprintf(buf, maxlen, "%s\n", name);                     \
1377 }                                                                       \
1378 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1379
1380 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1381         i->private_host_attrs[count] = device_attr_host_##field;        \
1382         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1383         i->private_host_attrs[count].store = NULL;                      \
1384         i->host_attrs[count] = &i->private_host_attrs[count];           \
1385         if (i->f->show_host_##field)                                    \
1386                 count++
1387
1388 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1389         i->private_host_attrs[count] = device_attr_host_##field;        \
1390         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1391         i->private_host_attrs[count].store = NULL;                      \
1392         i->host_attrs[count] = &i->private_host_attrs[count];           \
1393         count++
1394
1395 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1396         i->private_host_attrs[count] = device_attr_host_##field;        \
1397         if (!i->f->set_host_##field) {                                  \
1398                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1399                 i->private_host_attrs[count].store = NULL;              \
1400         }                                                               \
1401         i->host_attrs[count] = &i->private_host_attrs[count];           \
1402         if (i->f->show_host_##field)                                    \
1403                 count++
1404
1405
1406 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1407 static ssize_t                                                          \
1408 show_fc_host_##field (struct device *dev,                               \
1409                       struct device_attribute *attr, char *buf)         \
1410 {                                                                       \
1411         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1412         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1413 }
1414
1415 #define fc_private_host_rd_attr(field, format_string, sz)               \
1416         fc_private_host_show_function(field, format_string, sz, )       \
1417 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1418                          show_fc_host_##field, NULL)
1419
1420 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1421         fc_private_host_show_function(field, format_string, sz, (cast)) \
1422 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1423                           show_fc_host_##field, NULL)
1424
1425 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1426         i->private_host_attrs[count] = device_attr_host_##field;        \
1427         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1428         i->private_host_attrs[count].store = NULL;                      \
1429         i->host_attrs[count] = &i->private_host_attrs[count];           \
1430         count++
1431
1432 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1433 {                                                                       \
1434         i->private_host_attrs[count] = device_attr_host_##field;        \
1435         i->host_attrs[count] = &i->private_host_attrs[count];           \
1436         count++;                                                        \
1437 }
1438
1439
1440 /* Fixed Host Attributes */
1441
1442 static ssize_t
1443 show_fc_host_supported_classes (struct device *dev,
1444                                 struct device_attribute *attr, char *buf)
1445 {
1446         struct Scsi_Host *shost = transport_class_to_shost(dev);
1447
1448         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1449                 return snprintf(buf, 20, "unspecified\n");
1450
1451         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1452 }
1453 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1454                 show_fc_host_supported_classes, NULL);
1455
1456 static ssize_t
1457 show_fc_host_supported_fc4s (struct device *dev,
1458                              struct device_attribute *attr, char *buf)
1459 {
1460         struct Scsi_Host *shost = transport_class_to_shost(dev);
1461         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1462 }
1463 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1464                 show_fc_host_supported_fc4s, NULL);
1465
1466 static ssize_t
1467 show_fc_host_supported_speeds (struct device *dev,
1468                                struct device_attribute *attr, char *buf)
1469 {
1470         struct Scsi_Host *shost = transport_class_to_shost(dev);
1471
1472         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1473                 return snprintf(buf, 20, "unknown\n");
1474
1475         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1476 }
1477 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1478                 show_fc_host_supported_speeds, NULL);
1479
1480
1481 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1482 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1483 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1484                              unsigned long long);
1485 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1486 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1487 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1488
1489
1490 /* Dynamic Host Attributes */
1491
1492 static ssize_t
1493 show_fc_host_active_fc4s (struct device *dev,
1494                           struct device_attribute *attr, char *buf)
1495 {
1496         struct Scsi_Host *shost = transport_class_to_shost(dev);
1497         struct fc_internal *i = to_fc_internal(shost->transportt);
1498
1499         if (i->f->get_host_active_fc4s)
1500                 i->f->get_host_active_fc4s(shost);
1501
1502         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1503 }
1504 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1505                 show_fc_host_active_fc4s, NULL);
1506
1507 static ssize_t
1508 show_fc_host_speed (struct device *dev,
1509                     struct device_attribute *attr, char *buf)
1510 {
1511         struct Scsi_Host *shost = transport_class_to_shost(dev);
1512         struct fc_internal *i = to_fc_internal(shost->transportt);
1513
1514         if (i->f->get_host_speed)
1515                 i->f->get_host_speed(shost);
1516
1517         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1518                 return snprintf(buf, 20, "unknown\n");
1519
1520         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1521 }
1522 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1523                 show_fc_host_speed, NULL);
1524
1525
1526 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1527 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1528 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1529 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1530 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1531
1532 fc_private_host_show_function(system_hostname, "%s\n",
1533                 FC_SYMBOLIC_NAME_SIZE + 1, )
1534 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1535 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1536                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1537
1538
1539 /* Private Host Attributes */
1540
1541 static ssize_t
1542 show_fc_private_host_tgtid_bind_type(struct device *dev,
1543                                      struct device_attribute *attr, char *buf)
1544 {
1545         struct Scsi_Host *shost = transport_class_to_shost(dev);
1546         const char *name;
1547
1548         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1549         if (!name)
1550                 return -EINVAL;
1551         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1552 }
1553
1554 #define get_list_head_entry(pos, head, member)          \
1555         pos = list_entry((head)->next, typeof(*pos), member)
1556
1557 static ssize_t
1558 store_fc_private_host_tgtid_bind_type(struct device *dev,
1559         struct device_attribute *attr, const char *buf, size_t count)
1560 {
1561         struct Scsi_Host *shost = transport_class_to_shost(dev);
1562         struct fc_rport *rport;
1563         enum fc_tgtid_binding_type val;
1564         unsigned long flags;
1565
1566         if (get_fc_tgtid_bind_type_match(buf, &val))
1567                 return -EINVAL;
1568
1569         /* if changing bind type, purge all unused consistent bindings */
1570         if (val != fc_host_tgtid_bind_type(shost)) {
1571                 spin_lock_irqsave(shost->host_lock, flags);
1572                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1573                         get_list_head_entry(rport,
1574                                 &fc_host_rport_bindings(shost), peers);
1575                         list_del(&rport->peers);
1576                         rport->port_state = FC_PORTSTATE_DELETED;
1577                         fc_queue_work(shost, &rport->rport_delete_work);
1578                 }
1579                 spin_unlock_irqrestore(shost->host_lock, flags);
1580         }
1581
1582         fc_host_tgtid_bind_type(shost) = val;
1583         return count;
1584 }
1585
1586 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1587                         show_fc_private_host_tgtid_bind_type,
1588                         store_fc_private_host_tgtid_bind_type);
1589
1590 static ssize_t
1591 store_fc_private_host_issue_lip(struct device *dev,
1592         struct device_attribute *attr, const char *buf, size_t count)
1593 {
1594         struct Scsi_Host *shost = transport_class_to_shost(dev);
1595         struct fc_internal *i = to_fc_internal(shost->transportt);
1596         int ret;
1597
1598         /* ignore any data value written to the attribute */
1599         if (i->f->issue_fc_host_lip) {
1600                 ret = i->f->issue_fc_host_lip(shost);
1601                 return ret ? ret: count;
1602         }
1603
1604         return -ENOENT;
1605 }
1606
1607 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1608                         store_fc_private_host_issue_lip);
1609
1610 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1611
1612
1613 /*
1614  * Host Statistics Management
1615  */
1616
1617 /* Show a given an attribute in the statistics group */
1618 static ssize_t
1619 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1620 {
1621         struct Scsi_Host *shost = transport_class_to_shost(dev);
1622         struct fc_internal *i = to_fc_internal(shost->transportt);
1623         struct fc_host_statistics *stats;
1624         ssize_t ret = -ENOENT;
1625
1626         if (offset > sizeof(struct fc_host_statistics) ||
1627             offset % sizeof(u64) != 0)
1628                 WARN_ON(1);
1629
1630         if (i->f->get_fc_host_stats) {
1631                 stats = (i->f->get_fc_host_stats)(shost);
1632                 if (stats)
1633                         ret = snprintf(buf, 20, "0x%llx\n",
1634                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1635         }
1636         return ret;
1637 }
1638
1639
1640 /* generate a read-only statistics attribute */
1641 #define fc_host_statistic(name)                                         \
1642 static ssize_t show_fcstat_##name(struct device *cd,                    \
1643                                   struct device_attribute *attr,        \
1644                                   char *buf)                            \
1645 {                                                                       \
1646         return fc_stat_show(cd, buf,                                    \
1647                             offsetof(struct fc_host_statistics, name)); \
1648 }                                                                       \
1649 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1650
1651 fc_host_statistic(seconds_since_last_reset);
1652 fc_host_statistic(tx_frames);
1653 fc_host_statistic(tx_words);
1654 fc_host_statistic(rx_frames);
1655 fc_host_statistic(rx_words);
1656 fc_host_statistic(lip_count);
1657 fc_host_statistic(nos_count);
1658 fc_host_statistic(error_frames);
1659 fc_host_statistic(dumped_frames);
1660 fc_host_statistic(link_failure_count);
1661 fc_host_statistic(loss_of_sync_count);
1662 fc_host_statistic(loss_of_signal_count);
1663 fc_host_statistic(prim_seq_protocol_err_count);
1664 fc_host_statistic(invalid_tx_word_count);
1665 fc_host_statistic(invalid_crc_count);
1666 fc_host_statistic(fcp_input_requests);
1667 fc_host_statistic(fcp_output_requests);
1668 fc_host_statistic(fcp_control_requests);
1669 fc_host_statistic(fcp_input_megabytes);
1670 fc_host_statistic(fcp_output_megabytes);
1671
1672 static ssize_t
1673 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1674                     const char *buf, size_t count)
1675 {
1676         struct Scsi_Host *shost = transport_class_to_shost(dev);
1677         struct fc_internal *i = to_fc_internal(shost->transportt);
1678
1679         /* ignore any data value written to the attribute */
1680         if (i->f->reset_fc_host_stats) {
1681                 i->f->reset_fc_host_stats(shost);
1682                 return count;
1683         }
1684
1685         return -ENOENT;
1686 }
1687 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1688                                 fc_reset_statistics);
1689
1690 static struct attribute *fc_statistics_attrs[] = {
1691         &device_attr_host_seconds_since_last_reset.attr,
1692         &device_attr_host_tx_frames.attr,
1693         &device_attr_host_tx_words.attr,
1694         &device_attr_host_rx_frames.attr,
1695         &device_attr_host_rx_words.attr,
1696         &device_attr_host_lip_count.attr,
1697         &device_attr_host_nos_count.attr,
1698         &device_attr_host_error_frames.attr,
1699         &device_attr_host_dumped_frames.attr,
1700         &device_attr_host_link_failure_count.attr,
1701         &device_attr_host_loss_of_sync_count.attr,
1702         &device_attr_host_loss_of_signal_count.attr,
1703         &device_attr_host_prim_seq_protocol_err_count.attr,
1704         &device_attr_host_invalid_tx_word_count.attr,
1705         &device_attr_host_invalid_crc_count.attr,
1706         &device_attr_host_fcp_input_requests.attr,
1707         &device_attr_host_fcp_output_requests.attr,
1708         &device_attr_host_fcp_control_requests.attr,
1709         &device_attr_host_fcp_input_megabytes.attr,
1710         &device_attr_host_fcp_output_megabytes.attr,
1711         &device_attr_host_reset_statistics.attr,
1712         NULL
1713 };
1714
1715 static struct attribute_group fc_statistics_group = {
1716         .name = "statistics",
1717         .attrs = fc_statistics_attrs,
1718 };
1719
1720
1721 /* Host Vport Attributes */
1722
1723 static int
1724 fc_parse_wwn(const char *ns, u64 *nm)
1725 {
1726         unsigned int i, j;
1727         u8 wwn[8];
1728
1729         memset(wwn, 0, sizeof(wwn));
1730
1731         /* Validate and store the new name */
1732         for (i=0, j=0; i < 16; i++) {
1733                 if ((*ns >= 'a') && (*ns <= 'f'))
1734                         j = ((j << 4) | ((*ns++ -'a') + 10));
1735                 else if ((*ns >= 'A') && (*ns <= 'F'))
1736                         j = ((j << 4) | ((*ns++ -'A') + 10));
1737                 else if ((*ns >= '0') && (*ns <= '9'))
1738                         j = ((j << 4) | (*ns++ -'0'));
1739                 else
1740                         return -EINVAL;
1741                 if (i % 2) {
1742                         wwn[i/2] = j & 0xff;
1743                         j = 0;
1744                 }
1745         }
1746
1747         *nm = wwn_to_u64(wwn);
1748
1749         return 0;
1750 }
1751
1752
1753 /*
1754  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1755  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1756  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1757  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1758  */
1759 static ssize_t
1760 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1761                            const char *buf, size_t count)
1762 {
1763         struct Scsi_Host *shost = transport_class_to_shost(dev);
1764         struct fc_vport_identifiers vid;
1765         struct fc_vport *vport;
1766         unsigned int cnt=count;
1767         int stat;
1768
1769         memset(&vid, 0, sizeof(vid));
1770
1771         /* count may include a LF at end of string */
1772         if (buf[cnt-1] == '\n')
1773                 cnt--;
1774
1775         /* validate we have enough characters for WWPN */
1776         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1777                 return -EINVAL;
1778
1779         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1780         if (stat)
1781                 return stat;
1782
1783         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1784         if (stat)
1785                 return stat;
1786
1787         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1788         vid.vport_type = FC_PORTTYPE_NPIV;
1789         /* vid.symbolic_name is already zero/NULL's */
1790         vid.disable = false;            /* always enabled */
1791
1792         /* we only allow support on Channel 0 !!! */
1793         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1794         return stat ? stat : count;
1795 }
1796 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1797                         store_fc_host_vport_create);
1798
1799
1800 /*
1801  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1802  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1803  * The WWNs are specified as hex characters, and may *not* contain
1804  * any prefixes (e.g. 0x, x, etc)
1805  */
1806 static ssize_t
1807 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1808                            const char *buf, size_t count)
1809 {
1810         struct Scsi_Host *shost = transport_class_to_shost(dev);
1811         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1812         struct fc_vport *vport;
1813         u64 wwpn, wwnn;
1814         unsigned long flags;
1815         unsigned int cnt=count;
1816         int stat, match;
1817
1818         /* count may include a LF at end of string */
1819         if (buf[cnt-1] == '\n')
1820                 cnt--;
1821
1822         /* validate we have enough characters for WWPN */
1823         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1824                 return -EINVAL;
1825
1826         stat = fc_parse_wwn(&buf[0], &wwpn);
1827         if (stat)
1828                 return stat;
1829
1830         stat = fc_parse_wwn(&buf[17], &wwnn);
1831         if (stat)
1832                 return stat;
1833
1834         spin_lock_irqsave(shost->host_lock, flags);
1835         match = 0;
1836         /* we only allow support on Channel 0 !!! */
1837         list_for_each_entry(vport, &fc_host->vports, peers) {
1838                 if ((vport->channel == 0) &&
1839                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1840                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1841                                 break;
1842                         vport->flags |= FC_VPORT_DELETING;
1843                         match = 1;
1844                         break;
1845                 }
1846         }
1847         spin_unlock_irqrestore(shost->host_lock, flags);
1848
1849         if (!match)
1850                 return -ENODEV;
1851
1852         stat = fc_vport_terminate(vport);
1853         return stat ? stat : count;
1854 }
1855 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1856                         store_fc_host_vport_delete);
1857
1858
1859 static int fc_host_match(struct attribute_container *cont,
1860                           struct device *dev)
1861 {
1862         struct Scsi_Host *shost;
1863         struct fc_internal *i;
1864
1865         if (!scsi_is_host_device(dev))
1866                 return 0;
1867
1868         shost = dev_to_shost(dev);
1869         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1870             != &fc_host_class.class)
1871                 return 0;
1872
1873         i = to_fc_internal(shost->transportt);
1874
1875         return &i->t.host_attrs.ac == cont;
1876 }
1877
1878 static int fc_target_match(struct attribute_container *cont,
1879                             struct device *dev)
1880 {
1881         struct Scsi_Host *shost;
1882         struct fc_internal *i;
1883
1884         if (!scsi_is_target_device(dev))
1885                 return 0;
1886
1887         shost = dev_to_shost(dev->parent);
1888         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1889             != &fc_host_class.class)
1890                 return 0;
1891
1892         i = to_fc_internal(shost->transportt);
1893
1894         return &i->t.target_attrs.ac == cont;
1895 }
1896
1897 static void fc_rport_dev_release(struct device *dev)
1898 {
1899         struct fc_rport *rport = dev_to_rport(dev);
1900         put_device(dev->parent);
1901         kfree(rport);
1902 }
1903
1904 int scsi_is_fc_rport(const struct device *dev)
1905 {
1906         return dev->release == fc_rport_dev_release;
1907 }
1908 EXPORT_SYMBOL(scsi_is_fc_rport);
1909
1910 static int fc_rport_match(struct attribute_container *cont,
1911                             struct device *dev)
1912 {
1913         struct Scsi_Host *shost;
1914         struct fc_internal *i;
1915
1916         if (!scsi_is_fc_rport(dev))
1917                 return 0;
1918
1919         shost = dev_to_shost(dev->parent);
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
1926         return &i->rport_attr_cont.ac == cont;
1927 }
1928
1929
1930 static void fc_vport_dev_release(struct device *dev)
1931 {
1932         struct fc_vport *vport = dev_to_vport(dev);
1933         put_device(dev->parent);                /* release kobj parent */
1934         kfree(vport);
1935 }
1936
1937 int scsi_is_fc_vport(const struct device *dev)
1938 {
1939         return dev->release == fc_vport_dev_release;
1940 }
1941 EXPORT_SYMBOL(scsi_is_fc_vport);
1942
1943 static int fc_vport_match(struct attribute_container *cont,
1944                             struct device *dev)
1945 {
1946         struct fc_vport *vport;
1947         struct Scsi_Host *shost;
1948         struct fc_internal *i;
1949
1950         if (!scsi_is_fc_vport(dev))
1951                 return 0;
1952         vport = dev_to_vport(dev);
1953
1954         shost = vport_to_shost(vport);
1955         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1956             != &fc_host_class.class)
1957                 return 0;
1958
1959         i = to_fc_internal(shost->transportt);
1960         return &i->vport_attr_cont.ac == cont;
1961 }
1962
1963
1964 /**
1965  * fc_timed_out - FC Transport I/O timeout intercept handler
1966  * @scmd:       The SCSI command which timed out
1967  *
1968  * This routine protects against error handlers getting invoked while a
1969  * rport is in a blocked state, typically due to a temporarily loss of
1970  * connectivity. If the error handlers are allowed to proceed, requests
1971  * to abort i/o, reset the target, etc will likely fail as there is no way
1972  * to communicate with the device to perform the requested function. These
1973  * failures may result in the midlayer taking the device offline, requiring
1974  * manual intervention to restore operation.
1975  *
1976  * This routine, called whenever an i/o times out, validates the state of
1977  * the underlying rport. If the rport is blocked, it returns
1978  * EH_RESET_TIMER, which will continue to reschedule the timeout.
1979  * Eventually, either the device will return, or devloss_tmo will fire,
1980  * and when the timeout then fires, it will be handled normally.
1981  * If the rport is not blocked, normal error handling continues.
1982  *
1983  * Notes:
1984  *      This routine assumes no locks are held on entry.
1985  */
1986 static enum blk_eh_timer_return
1987 fc_timed_out(struct scsi_cmnd *scmd)
1988 {
1989         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
1990
1991         if (rport->port_state == FC_PORTSTATE_BLOCKED)
1992                 return BLK_EH_RESET_TIMER;
1993
1994         return BLK_EH_NOT_HANDLED;
1995 }
1996
1997 /*
1998  * Called by fc_user_scan to locate an rport on the shost that
1999  * matches the channel and target id, and invoke scsi_scan_target()
2000  * on the rport.
2001  */
2002 static void
2003 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2004 {
2005         struct fc_rport *rport;
2006         unsigned long flags;
2007
2008         spin_lock_irqsave(shost->host_lock, flags);
2009
2010         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2011                 if (rport->scsi_target_id == -1)
2012                         continue;
2013
2014                 if (rport->port_state != FC_PORTSTATE_ONLINE)
2015                         continue;
2016
2017                 if ((channel == rport->channel) &&
2018                     (id == rport->scsi_target_id)) {
2019                         spin_unlock_irqrestore(shost->host_lock, flags);
2020                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
2021                         return;
2022                 }
2023         }
2024
2025         spin_unlock_irqrestore(shost->host_lock, flags);
2026 }
2027
2028 /*
2029  * Called via sysfs scan routines. Necessary, as the FC transport
2030  * wants to place all target objects below the rport object. So this
2031  * routine must invoke the scsi_scan_target() routine with the rport
2032  * object as the parent.
2033  */
2034 static int
2035 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2036 {
2037         uint chlo, chhi;
2038         uint tgtlo, tgthi;
2039
2040         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2041             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2042             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2043                 return -EINVAL;
2044
2045         if (channel == SCAN_WILD_CARD) {
2046                 chlo = 0;
2047                 chhi = shost->max_channel + 1;
2048         } else {
2049                 chlo = channel;
2050                 chhi = channel + 1;
2051         }
2052
2053         if (id == SCAN_WILD_CARD) {
2054                 tgtlo = 0;
2055                 tgthi = shost->max_id;
2056         } else {
2057                 tgtlo = id;
2058                 tgthi = id + 1;
2059         }
2060
2061         for ( ; chlo < chhi; chlo++)
2062                 for ( ; tgtlo < tgthi; tgtlo++)
2063                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2064
2065         return 0;
2066 }
2067
2068 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2069                                 int result)
2070 {
2071         struct fc_internal *i = to_fc_internal(shost->transportt);
2072         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2073 }
2074
2075 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2076 {
2077         struct fc_internal *i = to_fc_internal(shost->transportt);
2078         return i->f->it_nexus_response(shost, nexus, result);
2079 }
2080
2081 struct scsi_transport_template *
2082 fc_attach_transport(struct fc_function_template *ft)
2083 {
2084         int count;
2085         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2086                                         GFP_KERNEL);
2087
2088         if (unlikely(!i))
2089                 return NULL;
2090
2091         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2092         i->t.target_attrs.ac.class = &fc_transport_class.class;
2093         i->t.target_attrs.ac.match = fc_target_match;
2094         i->t.target_size = sizeof(struct fc_starget_attrs);
2095         transport_container_register(&i->t.target_attrs);
2096
2097         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2098         i->t.host_attrs.ac.class = &fc_host_class.class;
2099         i->t.host_attrs.ac.match = fc_host_match;
2100         i->t.host_size = sizeof(struct fc_host_attrs);
2101         if (ft->get_fc_host_stats)
2102                 i->t.host_attrs.statistics = &fc_statistics_group;
2103         transport_container_register(&i->t.host_attrs);
2104
2105         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2106         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2107         i->rport_attr_cont.ac.match = fc_rport_match;
2108         transport_container_register(&i->rport_attr_cont);
2109
2110         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2111         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2112         i->vport_attr_cont.ac.match = fc_vport_match;
2113         transport_container_register(&i->vport_attr_cont);
2114
2115         i->f = ft;
2116
2117         /* Transport uses the shost workq for scsi scanning */
2118         i->t.create_work_queue = 1;
2119
2120         i->t.eh_timed_out = fc_timed_out;
2121
2122         i->t.user_scan = fc_user_scan;
2123
2124         /* target-mode drivers' functions */
2125         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2126         i->t.it_nexus_response = fc_it_nexus_response;
2127
2128         /*
2129          * Setup SCSI Target Attributes.
2130          */
2131         count = 0;
2132         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2133         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2134         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2135
2136         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2137
2138         i->starget_attrs[count] = NULL;
2139
2140
2141         /*
2142          * Setup SCSI Host Attributes.
2143          */
2144         count=0;
2145         SETUP_HOST_ATTRIBUTE_RD(node_name);
2146         SETUP_HOST_ATTRIBUTE_RD(port_name);
2147         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2148         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2149         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2150         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2151         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2152         if (ft->vport_create) {
2153                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2154                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2155         }
2156         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2157
2158         SETUP_HOST_ATTRIBUTE_RD(port_id);
2159         SETUP_HOST_ATTRIBUTE_RD(port_type);
2160         SETUP_HOST_ATTRIBUTE_RD(port_state);
2161         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2162         SETUP_HOST_ATTRIBUTE_RD(speed);
2163         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2164         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2165         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2166
2167         /* Transport-managed attributes */
2168         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2169         if (ft->issue_fc_host_lip)
2170                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2171         if (ft->vport_create)
2172                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2173         if (ft->vport_delete)
2174                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2175
2176         BUG_ON(count > FC_HOST_NUM_ATTRS);
2177
2178         i->host_attrs[count] = NULL;
2179
2180         /*
2181          * Setup Remote Port Attributes.
2182          */
2183         count=0;
2184         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2185         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2186         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2187         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2188         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2189         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2190         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2191         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2192         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2193         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2194
2195         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2196
2197         i->rport_attrs[count] = NULL;
2198
2199         /*
2200          * Setup Virtual Port Attributes.
2201          */
2202         count=0;
2203         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2204         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2205         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2206         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2207         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2208         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2209         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2210         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2211         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2212
2213         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2214
2215         i->vport_attrs[count] = NULL;
2216
2217         return &i->t;
2218 }
2219 EXPORT_SYMBOL(fc_attach_transport);
2220
2221 void fc_release_transport(struct scsi_transport_template *t)
2222 {
2223         struct fc_internal *i = to_fc_internal(t);
2224
2225         transport_container_unregister(&i->t.target_attrs);
2226         transport_container_unregister(&i->t.host_attrs);
2227         transport_container_unregister(&i->rport_attr_cont);
2228         transport_container_unregister(&i->vport_attr_cont);
2229
2230         kfree(i);
2231 }
2232 EXPORT_SYMBOL(fc_release_transport);
2233
2234 /**
2235  * fc_queue_work - Queue work to the fc_host workqueue.
2236  * @shost:      Pointer to Scsi_Host bound to fc_host.
2237  * @work:       Work to queue for execution.
2238  *
2239  * Return value:
2240  *      1 - work queued for execution
2241  *      0 - work is already queued
2242  *      -EINVAL - work queue doesn't exist
2243  */
2244 static int
2245 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2246 {
2247         if (unlikely(!fc_host_work_q(shost))) {
2248                 printk(KERN_ERR
2249                         "ERROR: FC host '%s' attempted to queue work, "
2250                         "when no workqueue created.\n", shost->hostt->name);
2251                 dump_stack();
2252
2253                 return -EINVAL;
2254         }
2255
2256         return queue_work(fc_host_work_q(shost), work);
2257 }
2258
2259 /**
2260  * fc_flush_work - Flush a fc_host's workqueue.
2261  * @shost:      Pointer to Scsi_Host bound to fc_host.
2262  */
2263 static void
2264 fc_flush_work(struct Scsi_Host *shost)
2265 {
2266         if (!fc_host_work_q(shost)) {
2267                 printk(KERN_ERR
2268                         "ERROR: FC host '%s' attempted to flush work, "
2269                         "when no workqueue created.\n", shost->hostt->name);
2270                 dump_stack();
2271                 return;
2272         }
2273
2274         flush_workqueue(fc_host_work_q(shost));
2275 }
2276
2277 /**
2278  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2279  * @shost:      Pointer to Scsi_Host bound to fc_host.
2280  * @work:       Work to queue for execution.
2281  * @delay:      jiffies to delay the work queuing
2282  *
2283  * Return value:
2284  *      1 on success / 0 already queued / < 0 for error
2285  */
2286 static int
2287 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2288                                 unsigned long delay)
2289 {
2290         if (unlikely(!fc_host_devloss_work_q(shost))) {
2291                 printk(KERN_ERR
2292                         "ERROR: FC host '%s' attempted to queue work, "
2293                         "when no workqueue created.\n", shost->hostt->name);
2294                 dump_stack();
2295
2296                 return -EINVAL;
2297         }
2298
2299         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2300 }
2301
2302 /**
2303  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2304  * @shost:      Pointer to Scsi_Host bound to fc_host.
2305  */
2306 static void
2307 fc_flush_devloss(struct Scsi_Host *shost)
2308 {
2309         if (!fc_host_devloss_work_q(shost)) {
2310                 printk(KERN_ERR
2311                         "ERROR: FC host '%s' attempted to flush work, "
2312                         "when no workqueue created.\n", shost->hostt->name);
2313                 dump_stack();
2314                 return;
2315         }
2316
2317         flush_workqueue(fc_host_devloss_work_q(shost));
2318 }
2319
2320
2321 /**
2322  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2323  * @shost:      Which &Scsi_Host
2324  *
2325  * This routine is expected to be called immediately preceeding the
2326  * a driver's call to scsi_remove_host().
2327  *
2328  * WARNING: A driver utilizing the fc_transport, which fails to call
2329  *   this routine prior to scsi_remove_host(), will leave dangling
2330  *   objects in /sys/class/fc_remote_ports. Access to any of these
2331  *   objects can result in a system crash !!!
2332  *
2333  * Notes:
2334  *      This routine assumes no locks are held on entry.
2335  */
2336 void
2337 fc_remove_host(struct Scsi_Host *shost)
2338 {
2339         struct fc_vport *vport = NULL, *next_vport = NULL;
2340         struct fc_rport *rport = NULL, *next_rport = NULL;
2341         struct workqueue_struct *work_q;
2342         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2343         unsigned long flags;
2344
2345         spin_lock_irqsave(shost->host_lock, flags);
2346
2347         /* Remove any vports */
2348         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2349                 fc_queue_work(shost, &vport->vport_delete_work);
2350
2351         /* Remove any remote ports */
2352         list_for_each_entry_safe(rport, next_rport,
2353                         &fc_host->rports, peers) {
2354                 list_del(&rport->peers);
2355                 rport->port_state = FC_PORTSTATE_DELETED;
2356                 fc_queue_work(shost, &rport->rport_delete_work);
2357         }
2358
2359         list_for_each_entry_safe(rport, next_rport,
2360                         &fc_host->rport_bindings, peers) {
2361                 list_del(&rport->peers);
2362                 rport->port_state = FC_PORTSTATE_DELETED;
2363                 fc_queue_work(shost, &rport->rport_delete_work);
2364         }
2365
2366         spin_unlock_irqrestore(shost->host_lock, flags);
2367
2368         /* flush all scan work items */
2369         scsi_flush_work(shost);
2370
2371         /* flush all stgt delete, and rport delete work items, then kill it  */
2372         if (fc_host->work_q) {
2373                 work_q = fc_host->work_q;
2374                 fc_host->work_q = NULL;
2375                 destroy_workqueue(work_q);
2376         }
2377
2378         /* flush all devloss work items, then kill it  */
2379         if (fc_host->devloss_work_q) {
2380                 work_q = fc_host->devloss_work_q;
2381                 fc_host->devloss_work_q = NULL;
2382                 destroy_workqueue(work_q);
2383         }
2384 }
2385 EXPORT_SYMBOL(fc_remove_host);
2386
2387 static void fc_terminate_rport_io(struct fc_rport *rport)
2388 {
2389         struct Scsi_Host *shost = rport_to_shost(rport);
2390         struct fc_internal *i = to_fc_internal(shost->transportt);
2391
2392         /* Involve the LLDD if possible to terminate all io on the rport. */
2393         if (i->f->terminate_rport_io)
2394                 i->f->terminate_rport_io(rport);
2395
2396         /*
2397          * must unblock to flush queued IO. The caller will have set
2398          * the port_state or flags, so that fc_remote_port_chkready will
2399          * fail IO.
2400          */
2401         scsi_target_unblock(&rport->dev);
2402 }
2403
2404 /**
2405  * fc_starget_delete - called to delete the scsi decendents of an rport
2406  * @work:       remote port to be operated on.
2407  *
2408  * Deletes target and all sdevs.
2409  */
2410 static void
2411 fc_starget_delete(struct work_struct *work)
2412 {
2413         struct fc_rport *rport =
2414                 container_of(work, struct fc_rport, stgt_delete_work);
2415
2416         fc_terminate_rport_io(rport);
2417         scsi_remove_target(&rport->dev);
2418 }
2419
2420
2421 /**
2422  * fc_rport_final_delete - finish rport termination and delete it.
2423  * @work:       remote port to be deleted.
2424  */
2425 static void
2426 fc_rport_final_delete(struct work_struct *work)
2427 {
2428         struct fc_rport *rport =
2429                 container_of(work, struct fc_rport, rport_delete_work);
2430         struct device *dev = &rport->dev;
2431         struct Scsi_Host *shost = rport_to_shost(rport);
2432         struct fc_internal *i = to_fc_internal(shost->transportt);
2433         unsigned long flags;
2434         int do_callback = 0;
2435
2436         /*
2437          * if a scan is pending, flush the SCSI Host work_q so that
2438          * that we can reclaim the rport scan work element.
2439          */
2440         if (rport->flags & FC_RPORT_SCAN_PENDING)
2441                 scsi_flush_work(shost);
2442
2443         fc_terminate_rport_io(rport);
2444
2445         /*
2446          * Cancel any outstanding timers. These should really exist
2447          * only when rmmod'ing the LLDD and we're asking for
2448          * immediate termination of the rports
2449          */
2450         spin_lock_irqsave(shost->host_lock, flags);
2451         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2452                 spin_unlock_irqrestore(shost->host_lock, flags);
2453                 if (!cancel_delayed_work(&rport->fail_io_work))
2454                         fc_flush_devloss(shost);
2455                 if (!cancel_delayed_work(&rport->dev_loss_work))
2456                         fc_flush_devloss(shost);
2457                 spin_lock_irqsave(shost->host_lock, flags);
2458                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2459         }
2460         spin_unlock_irqrestore(shost->host_lock, flags);
2461
2462         /* Delete SCSI target and sdevs */
2463         if (rport->scsi_target_id != -1)
2464                 fc_starget_delete(&rport->stgt_delete_work);
2465
2466         /*
2467          * Notify the driver that the rport is now dead. The LLDD will
2468          * also guarantee that any communication to the rport is terminated
2469          *
2470          * Avoid this call if we already called it when we preserved the
2471          * rport for the binding.
2472          */
2473         spin_lock_irqsave(shost->host_lock, flags);
2474         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2475             (i->f->dev_loss_tmo_callbk)) {
2476                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2477                 do_callback = 1;
2478         }
2479         spin_unlock_irqrestore(shost->host_lock, flags);
2480
2481         if (do_callback)
2482                 i->f->dev_loss_tmo_callbk(rport);
2483
2484         fc_bsg_remove(rport->rqst_q);
2485
2486         transport_remove_device(dev);
2487         device_del(dev);
2488         transport_destroy_device(dev);
2489         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2490         put_device(dev);                        /* for self-reference */
2491 }
2492
2493
2494 /**
2495  * fc_rport_create - allocates and creates a remote FC port.
2496  * @shost:      scsi host the remote port is connected to.
2497  * @channel:    Channel on shost port connected to.
2498  * @ids:        The world wide names, fc address, and FC4 port
2499  *              roles for the remote port.
2500  *
2501  * Allocates and creates the remoter port structure, including the
2502  * class and sysfs creation.
2503  *
2504  * Notes:
2505  *      This routine assumes no locks are held on entry.
2506  */
2507 static struct fc_rport *
2508 fc_rport_create(struct Scsi_Host *shost, int channel,
2509         struct fc_rport_identifiers  *ids)
2510 {
2511         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2512         struct fc_internal *fci = to_fc_internal(shost->transportt);
2513         struct fc_rport *rport;
2514         struct device *dev;
2515         unsigned long flags;
2516         int error;
2517         size_t size;
2518
2519         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2520         rport = kzalloc(size, GFP_KERNEL);
2521         if (unlikely(!rport)) {
2522                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2523                 return NULL;
2524         }
2525
2526         rport->maxframe_size = -1;
2527         rport->supported_classes = FC_COS_UNSPECIFIED;
2528         rport->dev_loss_tmo = fc_dev_loss_tmo;
2529         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2530         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2531         rport->port_id = ids->port_id;
2532         rport->roles = ids->roles;
2533         rport->port_state = FC_PORTSTATE_ONLINE;
2534         if (fci->f->dd_fcrport_size)
2535                 rport->dd_data = &rport[1];
2536         rport->channel = channel;
2537         rport->fast_io_fail_tmo = -1;
2538
2539         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2540         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2541         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2542         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2543         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2544
2545         spin_lock_irqsave(shost->host_lock, flags);
2546
2547         rport->number = fc_host->next_rport_number++;
2548         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2549                 rport->scsi_target_id = fc_host->next_target_id++;
2550         else
2551                 rport->scsi_target_id = -1;
2552         list_add_tail(&rport->peers, &fc_host->rports);
2553         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2554
2555         spin_unlock_irqrestore(shost->host_lock, flags);
2556
2557         dev = &rport->dev;
2558         device_initialize(dev);                 /* takes self reference */
2559         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2560         dev->release = fc_rport_dev_release;
2561         dev_set_name(dev, "rport-%d:%d-%d",
2562                      shost->host_no, channel, rport->number);
2563         transport_setup_device(dev);
2564
2565         error = device_add(dev);
2566         if (error) {
2567                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2568                 goto delete_rport;
2569         }
2570         transport_add_device(dev);
2571         transport_configure_device(dev);
2572
2573         fc_bsg_rportadd(shost, rport);
2574         /* ignore any bsg add error - we just can't do sgio */
2575
2576         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2577                 /* initiate a scan of the target */
2578                 rport->flags |= FC_RPORT_SCAN_PENDING;
2579                 scsi_queue_work(shost, &rport->scan_work);
2580         }
2581
2582         return rport;
2583
2584 delete_rport:
2585         transport_destroy_device(dev);
2586         spin_lock_irqsave(shost->host_lock, flags);
2587         list_del(&rport->peers);
2588         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2589         spin_unlock_irqrestore(shost->host_lock, flags);
2590         put_device(dev->parent);
2591         kfree(rport);
2592         return NULL;
2593 }
2594
2595 /**
2596  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2597  * @shost:      scsi host the remote port is connected to.
2598  * @channel:    Channel on shost port connected to.
2599  * @ids:        The world wide names, fc address, and FC4 port
2600  *              roles for the remote port.
2601  *
2602  * The LLDD calls this routine to notify the transport of the existence
2603  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2604  * of the port, it's FC address (port_id), and the FC4 roles that are
2605  * active for the port.
2606  *
2607  * For ports that are FCP targets (aka scsi targets), the FC transport
2608  * maintains consistent target id bindings on behalf of the LLDD.
2609  * A consistent target id binding is an assignment of a target id to
2610  * a remote port identifier, which persists while the scsi host is
2611  * attached. The remote port can disappear, then later reappear, and
2612  * it's target id assignment remains the same. This allows for shifts
2613  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2614  * changes to the scsi subsystem which is based on scsi host number and
2615  * target id values.  Bindings are only valid during the attachment of
2616  * the scsi host. If the host detaches, then later re-attaches, target
2617  * id bindings may change.
2618  *
2619  * This routine is responsible for returning a remote port structure.
2620  * The routine will search the list of remote ports it maintains
2621  * internally on behalf of consistent target id mappings. If found, the
2622  * remote port structure will be reused. Otherwise, a new remote port
2623  * structure will be allocated.
2624  *
2625  * Whenever a remote port is allocated, a new fc_remote_port class
2626  * device is created.
2627  *
2628  * Should not be called from interrupt context.
2629  *
2630  * Notes:
2631  *      This routine assumes no locks are held on entry.
2632  */
2633 struct fc_rport *
2634 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2635         struct fc_rport_identifiers  *ids)
2636 {
2637         struct fc_internal *fci = to_fc_internal(shost->transportt);
2638         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2639         struct fc_rport *rport;
2640         unsigned long flags;
2641         int match = 0;
2642
2643         /* ensure any stgt delete functions are done */
2644         fc_flush_work(shost);
2645
2646         /*
2647          * Search the list of "active" rports, for an rport that has been
2648          * deleted, but we've held off the real delete while the target
2649          * is in a "blocked" state.
2650          */
2651         spin_lock_irqsave(shost->host_lock, flags);
2652
2653         list_for_each_entry(rport, &fc_host->rports, peers) {
2654
2655                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2656                         (rport->channel == channel)) {
2657
2658                         switch (fc_host->tgtid_bind_type) {
2659                         case FC_TGTID_BIND_BY_WWPN:
2660                         case FC_TGTID_BIND_NONE:
2661                                 if (rport->port_name == ids->port_name)
2662                                         match = 1;
2663                                 break;
2664                         case FC_TGTID_BIND_BY_WWNN:
2665                                 if (rport->node_name == ids->node_name)
2666                                         match = 1;
2667                                 break;
2668                         case FC_TGTID_BIND_BY_ID:
2669                                 if (rport->port_id == ids->port_id)
2670                                         match = 1;
2671                                 break;
2672                         }
2673
2674                         if (match) {
2675
2676                                 memcpy(&rport->node_name, &ids->node_name,
2677                                         sizeof(rport->node_name));
2678                                 memcpy(&rport->port_name, &ids->port_name,
2679                                         sizeof(rport->port_name));
2680                                 rport->port_id = ids->port_id;
2681
2682                                 rport->port_state = FC_PORTSTATE_ONLINE;
2683                                 rport->roles = ids->roles;
2684
2685                                 spin_unlock_irqrestore(shost->host_lock, flags);
2686
2687                                 if (fci->f->dd_fcrport_size)
2688                                         memset(rport->dd_data, 0,
2689                                                 fci->f->dd_fcrport_size);
2690
2691                                 /*
2692                                  * If we were not a target, cancel the
2693                                  * io terminate and rport timers, and
2694                                  * we're done.
2695                                  *
2696                                  * If we were a target, but our new role
2697                                  * doesn't indicate a target, leave the
2698                                  * timers running expecting the role to
2699                                  * change as the target fully logs in. If
2700                                  * it doesn't, the target will be torn down.
2701                                  *
2702                                  * If we were a target, and our role shows
2703                                  * we're still a target, cancel the timers
2704                                  * and kick off a scan.
2705                                  */
2706
2707                                 /* was a target, not in roles */
2708                                 if ((rport->scsi_target_id != -1) &&
2709                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2710                                         return rport;
2711
2712                                 /*
2713                                  * Stop the fail io and dev_loss timers.
2714                                  * If they flush, the port_state will
2715                                  * be checked and will NOOP the function.
2716                                  */
2717                                 if (!cancel_delayed_work(&rport->fail_io_work))
2718                                         fc_flush_devloss(shost);
2719                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2720                                         fc_flush_devloss(shost);
2721
2722                                 spin_lock_irqsave(shost->host_lock, flags);
2723
2724                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2725                                                   FC_RPORT_DEVLOSS_PENDING |
2726                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2727
2728                                 /* if target, initiate a scan */
2729                                 if (rport->scsi_target_id != -1) {
2730                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2731                                         scsi_queue_work(shost,
2732                                                         &rport->scan_work);
2733                                         spin_unlock_irqrestore(shost->host_lock,
2734                                                         flags);
2735                                         scsi_target_unblock(&rport->dev);
2736                                 } else
2737                                         spin_unlock_irqrestore(shost->host_lock,
2738                                                         flags);
2739
2740                                 fc_bsg_goose_queue(rport);
2741
2742                                 return rport;
2743                         }
2744                 }
2745         }
2746
2747         /*
2748          * Search the bindings array
2749          * Note: if never a FCP target, you won't be on this list
2750          */
2751         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2752
2753                 /* search for a matching consistent binding */
2754
2755                 list_for_each_entry(rport, &fc_host->rport_bindings,
2756                                         peers) {
2757                         if (rport->channel != channel)
2758                                 continue;
2759
2760                         switch (fc_host->tgtid_bind_type) {
2761                         case FC_TGTID_BIND_BY_WWPN:
2762                                 if (rport->port_name == ids->port_name)
2763                                         match = 1;
2764                                 break;
2765                         case FC_TGTID_BIND_BY_WWNN:
2766                                 if (rport->node_name == ids->node_name)
2767                                         match = 1;
2768                                 break;
2769                         case FC_TGTID_BIND_BY_ID:
2770                                 if (rport->port_id == ids->port_id)
2771                                         match = 1;
2772                                 break;
2773                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2774                                 break;
2775                         }
2776
2777                         if (match) {
2778                                 list_move_tail(&rport->peers, &fc_host->rports);
2779                                 break;
2780                         }
2781                 }
2782
2783                 if (match) {
2784                         memcpy(&rport->node_name, &ids->node_name,
2785                                 sizeof(rport->node_name));
2786                         memcpy(&rport->port_name, &ids->port_name,
2787                                 sizeof(rport->port_name));
2788                         rport->port_id = ids->port_id;
2789                         rport->roles = ids->roles;
2790                         rport->port_state = FC_PORTSTATE_ONLINE;
2791                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2792
2793                         if (fci->f->dd_fcrport_size)
2794                                 memset(rport->dd_data, 0,
2795                                                 fci->f->dd_fcrport_size);
2796
2797                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2798                                 /* initiate a scan of the target */
2799                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2800                                 scsi_queue_work(shost, &rport->scan_work);
2801                                 spin_unlock_irqrestore(shost->host_lock, flags);
2802                                 scsi_target_unblock(&rport->dev);
2803                         } else
2804                                 spin_unlock_irqrestore(shost->host_lock, flags);
2805
2806                         return rport;
2807                 }
2808         }
2809
2810         spin_unlock_irqrestore(shost->host_lock, flags);
2811
2812         /* No consistent binding found - create new remote port entry */
2813         rport = fc_rport_create(shost, channel, ids);
2814
2815         return rport;
2816 }
2817 EXPORT_SYMBOL(fc_remote_port_add);
2818
2819
2820 /**
2821  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2822  * @rport:      The remote port that no longer exists
2823  *
2824  * The LLDD calls this routine to notify the transport that a remote
2825  * port is no longer part of the topology. Note: Although a port
2826  * may no longer be part of the topology, it may persist in the remote
2827  * ports displayed by the fc_host. We do this under 2 conditions:
2828  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2829  *   This allows the port to temporarily disappear, then reappear without
2830  *   disrupting the SCSI device tree attached to it. During the "blocked"
2831  *   period the port will still exist.
2832  * 2) If the port was a scsi target and disappears for longer than we
2833  *   expect, we'll delete the port and the tear down the SCSI device tree
2834  *   attached to it. However, we want to semi-persist the target id assigned
2835  *   to that port if it eventually does exist. The port structure will
2836  *   remain (although with minimal information) so that the target id
2837  *   bindings remails.
2838  *
2839  * If the remote port is not an FCP Target, it will be fully torn down
2840  * and deallocated, including the fc_remote_port class device.
2841  *
2842  * If the remote port is an FCP Target, the port will be placed in a
2843  * temporary blocked state. From the LLDD's perspective, the rport no
2844  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2845  * exists, but all sdevs on it are blocked from further I/O. The following
2846  * is then expected.
2847  *
2848  *   If the remote port does not return (signaled by a LLDD call to
2849  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2850  *   scsi target is removed - killing all outstanding i/o and removing the
2851  *   scsi devices attached ot it. The port structure will be marked Not
2852  *   Present and be partially cleared, leaving only enough information to
2853  *   recognize the remote port relative to the scsi target id binding if
2854  *   it later appears.  The port will remain as long as there is a valid
2855  *   binding (e.g. until the user changes the binding type or unloads the
2856  *   scsi host with the binding).
2857  *
2858  *   If the remote port returns within the dev_loss_tmo value (and matches
2859  *   according to the target id binding type), the port structure will be
2860  *   reused. If it is no longer a SCSI target, the target will be torn
2861  *   down. If it continues to be a SCSI target, then the target will be
2862  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2863  *   to ensure that all luns are detected.
2864  *
2865  * Called from normal process context only - cannot be called from interrupt.
2866  *
2867  * Notes:
2868  *      This routine assumes no locks are held on entry.
2869  */
2870 void
2871 fc_remote_port_delete(struct fc_rport  *rport)
2872 {
2873         struct Scsi_Host *shost = rport_to_shost(rport);
2874         unsigned long timeout = rport->dev_loss_tmo;
2875         unsigned long flags;
2876
2877         /*
2878          * No need to flush the fc_host work_q's, as all adds are synchronous.
2879          *
2880          * We do need to reclaim the rport scan work element, so eventually
2881          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2882          * there's still a scan pending.
2883          */
2884
2885         spin_lock_irqsave(shost->host_lock, flags);
2886
2887         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2888                 spin_unlock_irqrestore(shost->host_lock, flags);
2889                 return;
2890         }
2891
2892         /*
2893          * In the past, we if this was not an FCP-Target, we would
2894          * unconditionally just jump to deleting the rport.
2895          * However, rports can be used as node containers by the LLDD,
2896          * and its not appropriate to just terminate the rport at the
2897          * first sign of a loss in connectivity. The LLDD may want to
2898          * send ELS traffic to re-validate the login. If the rport is
2899          * immediately deleted, it makes it inappropriate for a node
2900          * container.
2901          * So... we now unconditionally wait dev_loss_tmo before
2902          * destroying an rport.
2903          */
2904
2905         rport->port_state = FC_PORTSTATE_BLOCKED;
2906
2907         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2908
2909         spin_unlock_irqrestore(shost->host_lock, flags);
2910
2911         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2912             shost->active_mode & MODE_TARGET)
2913                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2914
2915         scsi_target_block(&rport->dev);
2916
2917         /* see if we need to kill io faster than waiting for device loss */
2918         if ((rport->fast_io_fail_tmo != -1) &&
2919             (rport->fast_io_fail_tmo < timeout))
2920                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2921                                         rport->fast_io_fail_tmo * HZ);
2922
2923         /* cap the length the devices can be blocked until they are deleted */
2924         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2925 }
2926 EXPORT_SYMBOL(fc_remote_port_delete);
2927
2928 /**
2929  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2930  * @rport:      The remote port that changed.
2931  * @roles:      New roles for this port.
2932  *
2933  * Description: The LLDD calls this routine to notify the transport that the
2934  * roles on a remote port may have changed. The largest effect of this is
2935  * if a port now becomes a FCP Target, it must be allocated a
2936  * scsi target id.  If the port is no longer a FCP target, any
2937  * scsi target id value assigned to it will persist in case the
2938  * role changes back to include FCP Target. No changes in the scsi
2939  * midlayer will be invoked if the role changes (in the expectation
2940  * that the role will be resumed. If it doesn't normal error processing
2941  * will take place).
2942  *
2943  * Should not be called from interrupt context.
2944  *
2945  * Notes:
2946  *      This routine assumes no locks are held on entry.
2947  */
2948 void
2949 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
2950 {
2951         struct Scsi_Host *shost = rport_to_shost(rport);
2952         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2953         unsigned long flags;
2954         int create = 0;
2955         int ret;
2956
2957         spin_lock_irqsave(shost->host_lock, flags);
2958         if (roles & FC_PORT_ROLE_FCP_TARGET) {
2959                 if (rport->scsi_target_id == -1) {
2960                         rport->scsi_target_id = fc_host->next_target_id++;
2961                         create = 1;
2962                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
2963                         create = 1;
2964         } else if (shost->active_mode & MODE_TARGET) {
2965                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
2966                                              (char *)&rport->node_name);
2967                 if (ret)
2968                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
2969                                ret);
2970         }
2971
2972         rport->roles = roles;
2973
2974         spin_unlock_irqrestore(shost->host_lock, flags);
2975
2976         if (create) {
2977                 /*
2978                  * There may have been a delete timer running on the
2979                  * port. Ensure that it is cancelled as we now know
2980                  * the port is an FCP Target.
2981                  * Note: we know the rport is exists and in an online
2982                  *  state as the LLDD would not have had an rport
2983                  *  reference to pass us.
2984                  *
2985                  * Take no action on the del_timer failure as the state
2986                  * machine state change will validate the
2987                  * transaction.
2988                  */
2989                 if (!cancel_delayed_work(&rport->fail_io_work))
2990                         fc_flush_devloss(shost);
2991                 if (!cancel_delayed_work(&rport->dev_loss_work))
2992                         fc_flush_devloss(shost);
2993
2994                 spin_lock_irqsave(shost->host_lock, flags);
2995                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2996                                   FC_RPORT_DEVLOSS_PENDING);
2997                 spin_unlock_irqrestore(shost->host_lock, flags);
2998
2999                 /* ensure any stgt delete functions are done */
3000                 fc_flush_work(shost);
3001
3002                 /* initiate a scan of the target */
3003                 spin_lock_irqsave(shost->host_lock, flags);
3004                 rport->flags |= FC_RPORT_SCAN_PENDING;
3005                 scsi_queue_work(shost, &rport->scan_work);
3006                 spin_unlock_irqrestore(shost->host_lock, flags);
3007                 scsi_target_unblock(&rport->dev);
3008         }
3009 }
3010 EXPORT_SYMBOL(fc_remote_port_rolechg);
3011
3012 /**
3013  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3014  * @work:       rport target that failed to reappear in the allotted time.
3015  *
3016  * Description: An attempt to delete a remote port blocks, and if it fails
3017  *              to return in the allotted time this gets called.
3018  */
3019 static void
3020 fc_timeout_deleted_rport(struct work_struct *work)
3021 {
3022         struct fc_rport *rport =
3023                 container_of(work, struct fc_rport, dev_loss_work.work);
3024         struct Scsi_Host *shost = rport_to_shost(rport);
3025         struct fc_internal *i = to_fc_internal(shost->transportt);
3026         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3027         unsigned long flags;
3028         int do_callback = 0;
3029
3030         spin_lock_irqsave(shost->host_lock, flags);
3031
3032         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3033
3034         /*
3035          * If the port is ONLINE, then it came back. If it was a SCSI
3036          * target, validate it still is. If not, tear down the
3037          * scsi_target on it.
3038          */
3039         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3040             (rport->scsi_target_id != -1) &&
3041             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3042                 dev_printk(KERN_ERR, &rport->dev,
3043                         "blocked FC remote port time out: no longer"
3044                         " a FCP target, removing starget\n");
3045                 spin_unlock_irqrestore(shost->host_lock, flags);
3046                 scsi_target_unblock(&rport->dev);
3047                 fc_queue_work(shost, &rport->stgt_delete_work);
3048                 return;
3049         }
3050
3051         /* NOOP state - we're flushing workq's */
3052         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3053                 spin_unlock_irqrestore(shost->host_lock, flags);
3054                 dev_printk(KERN_ERR, &rport->dev,
3055                         "blocked FC remote port time out: leaving"
3056                         " rport%s alone\n",
3057                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3058                 return;
3059         }
3060
3061         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3062             (rport->scsi_target_id == -1)) {
3063                 list_del(&rport->peers);
3064                 rport->port_state = FC_PORTSTATE_DELETED;
3065                 dev_printk(KERN_ERR, &rport->dev,
3066                         "blocked FC remote port time out: removing"
3067                         " rport%s\n",
3068                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3069                 fc_queue_work(shost, &rport->rport_delete_work);
3070                 spin_unlock_irqrestore(shost->host_lock, flags);
3071                 return;
3072         }
3073
3074         dev_printk(KERN_ERR, &rport->dev,
3075                 "blocked FC remote port time out: removing target and "
3076                 "saving binding\n");
3077
3078         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3079
3080         /*
3081          * Note: We do not remove or clear the hostdata area. This allows
3082          *   host-specific target data to persist along with the
3083          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3084          */
3085
3086         /*
3087          * Reinitialize port attributes that may change if the port comes back.
3088          */
3089         rport->maxframe_size = -1;
3090         rport->supported_classes = FC_COS_UNSPECIFIED;
3091         rport->roles = FC_PORT_ROLE_UNKNOWN;
3092         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3093         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3094
3095         /*
3096          * Pre-emptively kill I/O rather than waiting for the work queue
3097          * item to teardown the starget. (FCOE libFC folks prefer this
3098          * and to have the rport_port_id still set when it's done).
3099          */
3100         spin_unlock_irqrestore(shost->host_lock, flags);
3101         fc_terminate_rport_io(rport);
3102
3103         spin_lock_irqsave(shost->host_lock, flags);
3104
3105         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3106
3107                 /* remove the identifiers that aren't used in the consisting binding */
3108                 switch (fc_host->tgtid_bind_type) {
3109                 case FC_TGTID_BIND_BY_WWPN:
3110                         rport->node_name = -1;
3111                         rport->port_id = -1;
3112                         break;
3113                 case FC_TGTID_BIND_BY_WWNN:
3114                         rport->port_name = -1;
3115                         rport->port_id = -1;
3116                         break;
3117                 case FC_TGTID_BIND_BY_ID:
3118                         rport->node_name = -1;
3119                         rport->port_name = -1;
3120                         break;
3121                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3122                         break;
3123                 }
3124
3125                 /*
3126                  * As this only occurs if the remote port (scsi target)
3127                  * went away and didn't come back - we'll remove
3128                  * all attached scsi devices.
3129                  */
3130                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3131                 fc_queue_work(shost, &rport->stgt_delete_work);
3132
3133                 do_callback = 1;
3134         }
3135
3136         spin_unlock_irqrestore(shost->host_lock, flags);
3137
3138         /*
3139          * Notify the driver that the rport is now dead. The LLDD will
3140          * also guarantee that any communication to the rport is terminated
3141          *
3142          * Note: we set the CALLBK_DONE flag above to correspond
3143          */
3144         if (do_callback && i->f->dev_loss_tmo_callbk)
3145                 i->f->dev_loss_tmo_callbk(rport);
3146 }
3147
3148
3149 /**
3150  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3151  * @work:       rport to terminate io on.
3152  *
3153  * Notes: Only requests the failure of the io, not that all are flushed
3154  *    prior to returning.
3155  */
3156 static void
3157 fc_timeout_fail_rport_io(struct work_struct *work)
3158 {
3159         struct fc_rport *rport =
3160                 container_of(work, struct fc_rport, fail_io_work.work);
3161
3162         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3163                 return;
3164
3165         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3166         fc_terminate_rport_io(rport);
3167 }
3168
3169 /**
3170  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3171  * @work:       remote port to be scanned.
3172  */
3173 static void
3174 fc_scsi_scan_rport(struct work_struct *work)
3175 {
3176         struct fc_rport *rport =
3177                 container_of(work, struct fc_rport, scan_work);
3178         struct Scsi_Host *shost = rport_to_shost(rport);
3179         struct fc_internal *i = to_fc_internal(shost->transportt);
3180         unsigned long flags;
3181
3182         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3183             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3184             !(i->f->disable_target_scan)) {
3185                 scsi_scan_target(&rport->dev, rport->channel,
3186                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3187         }
3188
3189         spin_lock_irqsave(shost->host_lock, flags);
3190         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3191         spin_unlock_irqrestore(shost->host_lock, flags);
3192 }
3193
3194 /**
3195  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3196  * @cmnd: SCSI command that scsi_eh is trying to recover
3197  *
3198  * This routine can be called from a FC LLD scsi_eh callback. It
3199  * blocks the scsi_eh thread until the fc_rport leaves the
3200  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3201  * necessary to avoid the scsi_eh failing recovery actions for blocked
3202  * rports which would lead to offlined SCSI devices.
3203  *
3204  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3205  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3206  *          passed back to scsi_eh.
3207  */
3208 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3209 {
3210         struct Scsi_Host *shost = cmnd->device->host;
3211         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3212         unsigned long flags;
3213
3214         spin_lock_irqsave(shost->host_lock, flags);
3215         while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3216                !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3217                 spin_unlock_irqrestore(shost->host_lock, flags);
3218                 msleep(1000);
3219                 spin_lock_irqsave(shost->host_lock, flags);
3220         }
3221         spin_unlock_irqrestore(shost->host_lock, flags);
3222
3223         if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3224                 return FAST_IO_FAIL;
3225
3226         return 0;
3227 }
3228 EXPORT_SYMBOL(fc_block_scsi_eh);
3229
3230 /**
3231  * fc_vport_setup - allocates and creates a FC virtual port.
3232  * @shost:      scsi host the virtual port is connected to.
3233  * @channel:    Channel on shost port connected to.
3234  * @pdev:       parent device for vport
3235  * @ids:        The world wide names, FC4 port roles, etc for
3236  *              the virtual port.
3237  * @ret_vport:  The pointer to the created vport.
3238  *
3239  * Allocates and creates the vport structure, calls the parent host
3240  * to instantiate the vport, the completes w/ class and sysfs creation.
3241  *
3242  * Notes:
3243  *      This routine assumes no locks are held on entry.
3244  */
3245 static int
3246 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3247         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3248 {
3249         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3250         struct fc_internal *fci = to_fc_internal(shost->transportt);
3251         struct fc_vport *vport;
3252         struct device *dev;
3253         unsigned long flags;
3254         size_t size;
3255         int error;
3256
3257         *ret_vport = NULL;
3258
3259         if ( ! fci->f->vport_create)
3260                 return -ENOENT;
3261
3262         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3263         vport = kzalloc(size, GFP_KERNEL);
3264         if (unlikely(!vport)) {
3265                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3266                 return -ENOMEM;
3267         }
3268
3269         vport->vport_state = FC_VPORT_UNKNOWN;
3270         vport->vport_last_state = FC_VPORT_UNKNOWN;
3271         vport->node_name = ids->node_name;
3272         vport->port_name = ids->port_name;
3273         vport->roles = ids->roles;
3274         vport->vport_type = ids->vport_type;
3275         if (fci->f->dd_fcvport_size)
3276                 vport->dd_data = &vport[1];
3277         vport->shost = shost;
3278         vport->channel = channel;
3279         vport->flags = FC_VPORT_CREATING;
3280         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3281
3282         spin_lock_irqsave(shost->host_lock, flags);
3283
3284         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3285                 spin_unlock_irqrestore(shost->host_lock, flags);
3286                 kfree(vport);
3287                 return -ENOSPC;
3288         }
3289         fc_host->npiv_vports_inuse++;
3290         vport->number = fc_host->next_vport_number++;
3291         list_add_tail(&vport->peers, &fc_host->vports);
3292         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3293
3294         spin_unlock_irqrestore(shost->host_lock, flags);
3295
3296         dev = &vport->dev;
3297         device_initialize(dev);                 /* takes self reference */
3298         dev->parent = get_device(pdev);         /* takes parent reference */
3299         dev->release = fc_vport_dev_release;
3300         dev_set_name(dev, "vport-%d:%d-%d",
3301                      shost->host_no, channel, vport->number);
3302         transport_setup_device(dev);
3303
3304         error = device_add(dev);
3305         if (error) {
3306                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3307                 goto delete_vport;
3308         }
3309         transport_add_device(dev);
3310         transport_configure_device(dev);
3311
3312         error = fci->f->vport_create(vport, ids->disable);
3313         if (error) {
3314                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3315                 goto delete_vport_all;
3316         }
3317
3318         /*
3319          * if the parent isn't the physical adapter's Scsi_Host, ensure
3320          * the Scsi_Host at least contains ia symlink to the vport.
3321          */
3322         if (pdev != &shost->shost_gendev) {
3323                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3324                                  &dev->kobj, dev_name(dev));
3325                 if (error)
3326                         printk(KERN_ERR
3327                                 "%s: Cannot create vport symlinks for "
3328                                 "%s, err=%d\n",
3329                                 __func__, dev_name(dev), error);
3330         }
3331         spin_lock_irqsave(shost->host_lock, flags);
3332         vport->flags &= ~FC_VPORT_CREATING;
3333         spin_unlock_irqrestore(shost->host_lock, flags);
3334
3335         dev_printk(KERN_NOTICE, pdev,
3336                         "%s created via shost%d channel %d\n", dev_name(dev),
3337                         shost->host_no, channel);
3338
3339         *ret_vport = vport;
3340
3341         return 0;
3342
3343 delete_vport_all:
3344         transport_remove_device(dev);
3345         device_del(dev);
3346 delete_vport:
3347         transport_destroy_device(dev);
3348         spin_lock_irqsave(shost->host_lock, flags);
3349         list_del(&vport->peers);
3350         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3351         fc_host->npiv_vports_inuse--;
3352         spin_unlock_irqrestore(shost->host_lock, flags);
3353         put_device(dev->parent);
3354         kfree(vport);
3355
3356         return error;
3357 }
3358
3359 /**
3360  * fc_vport_create - Admin App or LLDD requests creation of a vport
3361  * @shost:      scsi host the virtual port is connected to.
3362  * @channel:    channel on shost port connected to.
3363  * @ids:        The world wide names, FC4 port roles, etc for
3364  *              the virtual port.
3365  *
3366  * Notes:
3367  *      This routine assumes no locks are held on entry.
3368  */
3369 struct fc_vport *
3370 fc_vport_create(struct Scsi_Host *shost, int channel,
3371         struct fc_vport_identifiers *ids)
3372 {
3373         int stat;
3374         struct fc_vport *vport;
3375
3376         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3377                  ids, &vport);
3378         return stat ? NULL : vport;
3379 }
3380 EXPORT_SYMBOL(fc_vport_create);
3381
3382 /**
3383  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3384  * @vport:      fc_vport to be terminated
3385  *
3386  * Calls the LLDD vport_delete() function, then deallocates and removes
3387  * the vport from the shost and object tree.
3388  *
3389  * Notes:
3390  *      This routine assumes no locks are held on entry.
3391  */
3392 int
3393 fc_vport_terminate(struct fc_vport *vport)
3394 {
3395         struct Scsi_Host *shost = vport_to_shost(vport);
3396         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3397         struct fc_internal *i = to_fc_internal(shost->transportt);
3398         struct device *dev = &vport->dev;
3399         unsigned long flags;
3400         int stat;
3401
3402         if (i->f->vport_delete)
3403                 stat = i->f->vport_delete(vport);
3404         else
3405                 stat = -ENOENT;
3406
3407         spin_lock_irqsave(shost->host_lock, flags);
3408         vport->flags &= ~FC_VPORT_DELETING;
3409         if (!stat) {
3410                 vport->flags |= FC_VPORT_DELETED;
3411                 list_del(&vport->peers);
3412                 fc_host->npiv_vports_inuse--;
3413                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3414         }
3415         spin_unlock_irqrestore(shost->host_lock, flags);
3416
3417         if (stat)
3418                 return stat;
3419
3420         if (dev->parent != &shost->shost_gendev)
3421                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3422         transport_remove_device(dev);
3423         device_del(dev);
3424         transport_destroy_device(dev);
3425
3426         /*
3427          * Removing our self-reference should mean our
3428          * release function gets called, which will drop the remaining
3429          * parent reference and free the data structure.
3430          */
3431         put_device(dev);                        /* for self-reference */
3432
3433         return 0; /* SUCCESS */
3434 }
3435 EXPORT_SYMBOL(fc_vport_terminate);
3436
3437 /**
3438  * fc_vport_sched_delete - workq-based delete request for a vport
3439  * @work:       vport to be deleted.
3440  */
3441 static void
3442 fc_vport_sched_delete(struct work_struct *work)
3443 {
3444         struct fc_vport *vport =
3445                 container_of(work, struct fc_vport, vport_delete_work);
3446         int stat;
3447
3448         stat = fc_vport_terminate(vport);
3449         if (stat)
3450                 dev_printk(KERN_ERR, vport->dev.parent,
3451                         "%s: %s could not be deleted created via "
3452                         "shost%d channel %d - error %d\n", __func__,
3453                         dev_name(&vport->dev), vport->shost->host_no,
3454                         vport->channel, stat);
3455 }
3456
3457
3458 /*
3459  * BSG support
3460  */
3461
3462
3463 /**
3464  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3465  * @job:        fc_bsg_job that is to be torn down
3466  */
3467 static void
3468 fc_destroy_bsgjob(struct fc_bsg_job *job)
3469 {
3470         unsigned long flags;
3471
3472         spin_lock_irqsave(&job->job_lock, flags);
3473         if (job->ref_cnt) {
3474                 spin_unlock_irqrestore(&job->job_lock, flags);
3475                 return;
3476         }
3477         spin_unlock_irqrestore(&job->job_lock, flags);
3478
3479         put_device(job->dev);   /* release reference for the request */
3480
3481         kfree(job->request_payload.sg_list);
3482         kfree(job->reply_payload.sg_list);
3483         kfree(job);
3484 }
3485
3486 /**
3487  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3488  *                  completed
3489  * @job:        fc_bsg_job that is complete
3490  */
3491 static void
3492 fc_bsg_jobdone(struct fc_bsg_job *job)
3493 {
3494         struct request *req = job->req;
3495         struct request *rsp = req->next_rq;
3496         int err;
3497
3498         err = job->req->errors = job->reply->result;
3499
3500         if (err < 0)
3501                 /* we're only returning the result field in the reply */
3502                 job->req->sense_len = sizeof(uint32_t);
3503         else
3504                 job->req->sense_len = job->reply_len;
3505
3506         /* we assume all request payload was transferred, residual == 0 */
3507         req->resid_len = 0;
3508
3509         if (rsp) {
3510                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3511
3512                 /* set reply (bidi) residual */
3513                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3514                                       rsp->resid_len);
3515         }
3516         blk_complete_request(req);
3517 }
3518
3519 /**
3520  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3521  * @rq:        BSG request that holds the job to be destroyed
3522  */
3523 static void fc_bsg_softirq_done(struct request *rq)
3524 {
3525         struct fc_bsg_job *job = rq->special;
3526         unsigned long flags;
3527
3528         spin_lock_irqsave(&job->job_lock, flags);
3529         job->state_flags |= FC_RQST_STATE_DONE;
3530         job->ref_cnt--;
3531         spin_unlock_irqrestore(&job->job_lock, flags);
3532
3533         blk_end_request_all(rq, rq->errors);
3534         fc_destroy_bsgjob(job);
3535 }
3536
3537 /**
3538  * fc_bsg_job_timeout - handler for when a bsg request timesout
3539  * @req:        request that timed out
3540  */
3541 static enum blk_eh_timer_return
3542 fc_bsg_job_timeout(struct request *req)
3543 {
3544         struct fc_bsg_job *job = (void *) req->special;
3545         struct Scsi_Host *shost = job->shost;
3546         struct fc_internal *i = to_fc_internal(shost->transportt);
3547         unsigned long flags;
3548         int err = 0, done = 0;
3549
3550         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3551                 return BLK_EH_RESET_TIMER;
3552
3553         spin_lock_irqsave(&job->job_lock, flags);
3554         if (job->state_flags & FC_RQST_STATE_DONE)
3555                 done = 1;
3556         else
3557                 job->ref_cnt++;
3558         spin_unlock_irqrestore(&job->job_lock, flags);
3559
3560         if (!done && i->f->bsg_timeout) {
3561                 /* call LLDD to abort the i/o as it has timed out */
3562                 err = i->f->bsg_timeout(job);
3563                 if (err == -EAGAIN) {
3564                         job->ref_cnt--;
3565                         return BLK_EH_RESET_TIMER;
3566                 } else if (err)
3567                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3568                                 "abort failed with status %d\n", err);
3569         }
3570
3571         /* the blk_end_sync_io() doesn't check the error */
3572         if (done)
3573                 return BLK_EH_NOT_HANDLED;
3574         else
3575                 return BLK_EH_HANDLED;
3576 }
3577
3578 static int
3579 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3580 {
3581         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3582
3583         BUG_ON(!req->nr_phys_segments);
3584
3585         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3586         if (!buf->sg_list)
3587                 return -ENOMEM;
3588         sg_init_table(buf->sg_list, req->nr_phys_segments);
3589         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3590         buf->payload_len = blk_rq_bytes(req);
3591         return 0;
3592 }
3593
3594
3595 /**
3596  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3597  *                   bsg request
3598  * @shost:      SCSI Host corresponding to the bsg object
3599  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3600  * @req:        BSG request that needs a job structure
3601  */
3602 static int
3603 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3604         struct request *req)
3605 {
3606         struct fc_internal *i = to_fc_internal(shost->transportt);
3607         struct request *rsp = req->next_rq;
3608         struct fc_bsg_job *job;
3609         int ret;
3610
3611         BUG_ON(req->special);
3612
3613         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3614                         GFP_KERNEL);
3615         if (!job)
3616                 return -ENOMEM;
3617
3618         /*
3619          * Note: this is a bit silly.
3620          * The request gets formatted as a SGIO v4 ioctl request, which
3621          * then gets reformatted as a blk request, which then gets
3622          * reformatted as a fc bsg request. And on completion, we have
3623          * to wrap return results such that SGIO v4 thinks it was a scsi
3624          * status.  I hope this was all worth it.
3625          */
3626
3627         req->special = job;
3628         job->shost = shost;
3629         job->rport = rport;
3630         job->req = req;
3631         if (i->f->dd_bsg_size)
3632                 job->dd_data = (void *)&job[1];
3633         spin_lock_init(&job->job_lock);
3634         job->request = (struct fc_bsg_request *)req->cmd;
3635         job->request_len = req->cmd_len;
3636         job->reply = req->sense;
3637         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3638                                                  * allocated */
3639         if (req->bio) {
3640                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3641                 if (ret)
3642                         goto failjob_rls_job;
3643         }
3644         if (rsp && rsp->bio) {
3645                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3646                 if (ret)
3647                         goto failjob_rls_rqst_payload;
3648         }
3649         job->job_done = fc_bsg_jobdone;
3650         if (rport)
3651                 job->dev = &rport->dev;
3652         else
3653                 job->dev = &shost->shost_gendev;
3654         get_device(job->dev);           /* take a reference for the request */
3655
3656         job->ref_cnt = 1;
3657
3658         return 0;
3659
3660
3661 failjob_rls_rqst_payload:
3662         kfree(job->request_payload.sg_list);
3663 failjob_rls_job:
3664         kfree(job);
3665         return -ENOMEM;
3666 }
3667
3668
3669 enum fc_dispatch_result {
3670         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3671         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3672         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3673 };
3674
3675
3676 /**
3677  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3678  * @q:          fc host request queue
3679  * @shost:      scsi host rport attached to
3680  * @job:        bsg job to be processed
3681  */
3682 static enum fc_dispatch_result
3683 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3684                          struct fc_bsg_job *job)
3685 {
3686         struct fc_internal *i = to_fc_internal(shost->transportt);
3687         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3688         int ret;
3689
3690         /* Validate the host command */
3691         switch (job->request->msgcode) {
3692         case FC_BSG_HST_ADD_RPORT:
3693                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3694                 break;
3695
3696         case FC_BSG_HST_DEL_RPORT:
3697                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3698                 break;
3699
3700         case FC_BSG_HST_ELS_NOLOGIN:
3701                 cmdlen += sizeof(struct fc_bsg_host_els);
3702                 /* there better be a xmt and rcv payloads */
3703                 if ((!job->request_payload.payload_len) ||
3704                     (!job->reply_payload.payload_len)) {
3705                         ret = -EINVAL;
3706                         goto fail_host_msg;
3707                 }
3708                 break;
3709
3710         case FC_BSG_HST_CT:
3711                 cmdlen += sizeof(struct fc_bsg_host_ct);
3712                 /* there better be xmt and rcv payloads */
3713                 if ((!job->request_payload.payload_len) ||
3714                     (!job->reply_payload.payload_len)) {
3715                         ret = -EINVAL;
3716                         goto fail_host_msg;
3717                 }
3718                 break;
3719
3720         case FC_BSG_HST_VENDOR:
3721                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3722                 if ((shost->hostt->vendor_id == 0L) ||
3723                     (job->request->rqst_data.h_vendor.vendor_id !=
3724                         shost->hostt->vendor_id)) {
3725                         ret = -ESRCH;
3726                         goto fail_host_msg;
3727                 }
3728                 break;
3729
3730         default:
3731                 ret = -EBADR;
3732                 goto fail_host_msg;
3733         }
3734
3735         /* check if we really have all the request data needed */
3736         if (job->request_len < cmdlen) {
3737                 ret = -ENOMSG;
3738                 goto fail_host_msg;
3739         }
3740
3741         ret = i->f->bsg_request(job);
3742         if (!ret)
3743                 return FC_DISPATCH_UNLOCKED;
3744
3745 fail_host_msg:
3746         /* return the errno failure code as the only status */
3747         BUG_ON(job->reply_len < sizeof(uint32_t));
3748         job->reply->reply_payload_rcv_len = 0;
3749         job->reply->result = ret;
3750         job->reply_len = sizeof(uint32_t);
3751         fc_bsg_jobdone(job);
3752         return FC_DISPATCH_UNLOCKED;
3753 }
3754
3755
3756 /*
3757  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3758  * @rport:      rport to be restarted
3759  */
3760 static void
3761 fc_bsg_goose_queue(struct fc_rport *rport)
3762 {
3763         int flagset;
3764         unsigned long flags;
3765
3766         if (!rport->rqst_q)
3767                 return;
3768
3769         get_device(&rport->dev);
3770
3771         spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
3772         flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
3773                   !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
3774         if (flagset)
3775                 queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
3776         __blk_run_queue(rport->rqst_q);
3777         if (flagset)
3778                 queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
3779         spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);
3780
3781         put_device(&rport->dev);
3782 }
3783
3784
3785 /**
3786  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3787  * @q:          rport request queue
3788  * @shost:      scsi host rport attached to
3789  * @rport:      rport request destined to
3790  * @job:        bsg job to be processed
3791  */
3792 static enum fc_dispatch_result
3793 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3794                          struct fc_rport *rport, struct fc_bsg_job *job)
3795 {
3796         struct fc_internal *i = to_fc_internal(shost->transportt);
3797         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3798         int ret;
3799
3800         /* Validate the rport command */
3801         switch (job->request->msgcode) {
3802         case FC_BSG_RPT_ELS:
3803                 cmdlen += sizeof(struct fc_bsg_rport_els);
3804                 goto check_bidi;
3805
3806         case FC_BSG_RPT_CT:
3807                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3808 check_bidi:
3809                 /* there better be xmt and rcv payloads */
3810                 if ((!job->request_payload.payload_len) ||
3811                     (!job->reply_payload.payload_len)) {
3812                         ret = -EINVAL;
3813                         goto fail_rport_msg;
3814                 }
3815                 break;
3816         default:
3817                 ret = -EBADR;
3818                 goto fail_rport_msg;
3819         }
3820
3821         /* check if we really have all the request data needed */
3822         if (job->request_len < cmdlen) {
3823                 ret = -ENOMSG;
3824                 goto fail_rport_msg;
3825         }
3826
3827         ret = i->f->bsg_request(job);
3828         if (!ret)
3829                 return FC_DISPATCH_UNLOCKED;
3830
3831 fail_rport_msg:
3832         /* return the errno failure code as the only status */
3833         BUG_ON(job->reply_len < sizeof(uint32_t));
3834         job->reply->reply_payload_rcv_len = 0;
3835         job->reply->result = ret;
3836         job->reply_len = sizeof(uint32_t);
3837         fc_bsg_jobdone(job);
3838         return FC_DISPATCH_UNLOCKED;
3839 }
3840
3841
3842 /**
3843  * fc_bsg_request_handler - generic handler for bsg requests
3844  * @q:          request queue to manage
3845  * @shost:      Scsi_Host related to the bsg object
3846  * @rport:      FC remote port related to the bsg object (optional)
3847  * @dev:        device structure for bsg object
3848  */
3849 static void
3850 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3851                        struct fc_rport *rport, struct device *dev)
3852 {
3853         struct request *req;
3854         struct fc_bsg_job *job;
3855         enum fc_dispatch_result ret;
3856
3857         if (!get_device(dev))
3858                 return;
3859
3860         while (!blk_queue_plugged(q)) {
3861                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3862                     !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3863                         break;
3864
3865                 req = blk_fetch_request(q);
3866                 if (!req)
3867                         break;
3868
3869                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3870                         req->errors = -ENXIO;
3871                         spin_unlock_irq(q->queue_lock);
3872                         blk_end_request_all(req, -ENXIO);
3873                         spin_lock_irq(q->queue_lock);
3874                         continue;
3875                 }
3876
3877                 spin_unlock_irq(q->queue_lock);
3878
3879                 ret = fc_req_to_bsgjob(shost, rport, req);
3880                 if (ret) {
3881                         req->errors = ret;
3882                         blk_end_request_all(req, ret);
3883                         spin_lock_irq(q->queue_lock);
3884                         continue;
3885                 }
3886
3887                 job = req->special;
3888
3889                 /* check if we have the msgcode value at least */
3890                 if (job->request_len < sizeof(uint32_t)) {
3891                         BUG_ON(job->reply_len < sizeof(uint32_t));
3892                         job->reply->reply_payload_rcv_len = 0;
3893                         job->reply->result = -ENOMSG;
3894                         job->reply_len = sizeof(uint32_t);
3895                         fc_bsg_jobdone(job);
3896                         spin_lock_irq(q->queue_lock);
3897                         continue;
3898                 }
3899
3900                 /* the dispatch routines will unlock the queue_lock */
3901                 if (rport)
3902                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3903                 else
3904                         ret = fc_bsg_host_dispatch(q, shost, job);
3905
3906                 /* did dispatcher hit state that can't process any more */
3907                 if (ret == FC_DISPATCH_BREAK)
3908                         break;
3909
3910                 /* did dispatcher had released the lock */
3911                 if (ret == FC_DISPATCH_UNLOCKED)
3912                         spin_lock_irq(q->queue_lock);
3913         }
3914
3915         spin_unlock_irq(q->queue_lock);
3916         put_device(dev);
3917         spin_lock_irq(q->queue_lock);
3918 }
3919
3920
3921 /**
3922  * fc_bsg_host_handler - handler for bsg requests for a fc host
3923  * @q:          fc host request queue
3924  */
3925 static void
3926 fc_bsg_host_handler(struct request_queue *q)
3927 {
3928         struct Scsi_Host *shost = q->queuedata;
3929
3930         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3931 }
3932
3933
3934 /**
3935  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3936  * @q:          rport request queue
3937  */
3938 static void
3939 fc_bsg_rport_handler(struct request_queue *q)
3940 {
3941         struct fc_rport *rport = q->queuedata;
3942         struct Scsi_Host *shost = rport_to_shost(rport);
3943
3944         fc_bsg_request_handler(q, shost, rport, &rport->dev);
3945 }
3946
3947
3948 /**
3949  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3950  * @shost:      shost for fc_host
3951  * @fc_host:    fc_host adding the structures to
3952  */
3953 static int
3954 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3955 {
3956         struct device *dev = &shost->shost_gendev;
3957         struct fc_internal *i = to_fc_internal(shost->transportt);
3958         struct request_queue *q;
3959         int err;
3960         char bsg_name[20];
3961
3962         fc_host->rqst_q = NULL;
3963
3964         if (!i->f->bsg_request)
3965                 return -ENOTSUPP;
3966
3967         snprintf(bsg_name, sizeof(bsg_name),
3968                  "fc_host%d", shost->host_no);
3969
3970         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
3971         if (!q) {
3972                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3973                                 "initialize - no request queue\n",
3974                                  shost->host_no);
3975                 return -ENOMEM;
3976         }
3977
3978         q->queuedata = shost;
3979         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
3980         blk_queue_softirq_done(q, fc_bsg_softirq_done);
3981         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
3982         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3983
3984         err = bsg_register_queue(q, dev, bsg_name, NULL);
3985         if (err) {
3986                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
3987                                 "initialize - register queue\n",
3988                                 shost->host_no);
3989                 blk_cleanup_queue(q);
3990                 return err;
3991         }
3992
3993         fc_host->rqst_q = q;
3994         return 0;
3995 }
3996
3997
3998 /**
3999  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4000  * @shost:      shost that rport is attached to
4001  * @rport:      rport that the bsg hooks are being attached to
4002  */
4003 static int
4004 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4005 {
4006         struct device *dev = &rport->dev;
4007         struct fc_internal *i = to_fc_internal(shost->transportt);
4008         struct request_queue *q;
4009         int err;
4010
4011         rport->rqst_q = NULL;
4012
4013         if (!i->f->bsg_request)
4014                 return -ENOTSUPP;
4015
4016         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4017         if (!q) {
4018                 printk(KERN_ERR "%s: bsg interface failed to "
4019                                 "initialize - no request queue\n",
4020                                  dev->kobj.name);
4021                 return -ENOMEM;
4022         }
4023
4024         q->queuedata = rport;
4025         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4026         blk_queue_softirq_done(q, fc_bsg_softirq_done);
4027         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4028         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4029
4030         err = bsg_register_queue(q, dev, NULL, NULL);
4031         if (err) {
4032                 printk(KERN_ERR "%s: bsg interface failed to "
4033                                 "initialize - register queue\n",
4034                                  dev->kobj.name);
4035                 blk_cleanup_queue(q);
4036                 return err;
4037         }
4038
4039         rport->rqst_q = q;
4040         return 0;
4041 }
4042
4043
4044 /**
4045  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4046  * @q:  the request_queue that is to be torn down.
4047  */
4048 static void
4049 fc_bsg_remove(struct request_queue *q)
4050 {
4051         if (q) {
4052                 bsg_unregister_queue(q);
4053                 blk_cleanup_queue(q);
4054         }
4055 }
4056
4057
4058 /* Original Author:  Martin Hicks */
4059 MODULE_AUTHOR("James Smart");
4060 MODULE_DESCRIPTION("FC Transport Attributes");
4061 MODULE_LICENSE("GPL");
4062
4063 module_init(fc_transport_init);
4064 module_exit(fc_transport_exit);