config: tegra3: enable /dev mount with ACL
[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 <linux/kernel.h>
33 #include <scsi/scsi_device.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_transport.h>
36 #include <scsi/scsi_transport_fc.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <linux/netlink.h>
39 #include <net/netlink.h>
40 #include <scsi/scsi_netlink_fc.h>
41 #include <scsi/scsi_bsg_fc.h>
42 #include "scsi_priv.h"
43 #include "scsi_transport_fc_internal.h"
44
45 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
46 static void fc_vport_sched_delete(struct work_struct *work);
47 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
48         struct device *pdev, struct fc_vport_identifiers  *ids,
49         struct fc_vport **vport);
50 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
51 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
52 static void fc_bsg_remove(struct request_queue *);
53 static void fc_bsg_goose_queue(struct fc_rport *);
54
55 /*
56  * Module Parameters
57  */
58
59 /*
60  * dev_loss_tmo: the default number of seconds that the FC transport
61  *   should insulate the loss of a remote port.
62  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
63  */
64 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
65
66 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
67 MODULE_PARM_DESC(dev_loss_tmo,
68                  "Maximum number of seconds that the FC transport should"
69                  " insulate the loss of a remote port. Once this value is"
70                  " exceeded, the scsi target is removed. Value should be"
71                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
72                  " fast_io_fail_tmo is not set.");
73
74 /*
75  * Redefine so that we can have same named attributes in the
76  * sdev/starget/host objects.
77  */
78 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
79 struct device_attribute device_attr_##_prefix##_##_name =       \
80         __ATTR(_name,_mode,_show,_store)
81
82 #define fc_enum_name_search(title, table_type, table)                   \
83 static const char *get_fc_##title##_name(enum table_type table_key)     \
84 {                                                                       \
85         int i;                                                          \
86         char *name = NULL;                                              \
87                                                                         \
88         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
89                 if (table[i].value == table_key) {                      \
90                         name = table[i].name;                           \
91                         break;                                          \
92                 }                                                       \
93         }                                                               \
94         return name;                                                    \
95 }
96
97 #define fc_enum_name_match(title, table_type, table)                    \
98 static int get_fc_##title##_match(const char *table_key,                \
99                 enum table_type *value)                                 \
100 {                                                                       \
101         int i;                                                          \
102                                                                         \
103         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
104                 if (strncmp(table_key, table[i].name,                   \
105                                 table[i].matchlen) == 0) {              \
106                         *value = table[i].value;                        \
107                         return 0; /* success */                         \
108                 }                                                       \
109         }                                                               \
110         return 1; /* failure */                                         \
111 }
112
113
114 /* Convert fc_port_type values to ascii string name */
115 static struct {
116         enum fc_port_type       value;
117         char                    *name;
118 } fc_port_type_names[] = {
119         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
120         { FC_PORTTYPE_OTHER,            "Other" },
121         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
122         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
123         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
124         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
125         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
126         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
127 };
128 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
129 #define FC_PORTTYPE_MAX_NAMELEN         50
130
131 /* Reuse fc_port_type enum function for vport_type */
132 #define get_fc_vport_type_name get_fc_port_type_name
133
134
135 /* Convert fc_host_event_code values to ascii string name */
136 static const struct {
137         enum fc_host_event_code         value;
138         char                            *name;
139 } fc_host_event_code_names[] = {
140         { FCH_EVT_LIP,                  "lip" },
141         { FCH_EVT_LINKUP,               "link_up" },
142         { FCH_EVT_LINKDOWN,             "link_down" },
143         { FCH_EVT_LIPRESET,             "lip_reset" },
144         { FCH_EVT_RSCN,                 "rscn" },
145         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
146         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
147         { FCH_EVT_PORT_ONLINE,          "port_online" },
148         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
149         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
150         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
151         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
152 };
153 fc_enum_name_search(host_event_code, fc_host_event_code,
154                 fc_host_event_code_names)
155 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
156
157
158 /* Convert fc_port_state values to ascii string name */
159 static struct {
160         enum fc_port_state      value;
161         char                    *name;
162 } fc_port_state_names[] = {
163         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
164         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
165         { FC_PORTSTATE_ONLINE,          "Online" },
166         { FC_PORTSTATE_OFFLINE,         "Offline" },
167         { FC_PORTSTATE_BLOCKED,         "Blocked" },
168         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
169         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
170         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
171         { FC_PORTSTATE_ERROR,           "Error" },
172         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
173         { FC_PORTSTATE_DELETED,         "Deleted" },
174 };
175 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
176 #define FC_PORTSTATE_MAX_NAMELEN        20
177
178
179 /* Convert fc_vport_state values to ascii string name */
180 static struct {
181         enum fc_vport_state     value;
182         char                    *name;
183 } fc_vport_state_names[] = {
184         { FC_VPORT_UNKNOWN,             "Unknown" },
185         { FC_VPORT_ACTIVE,              "Active" },
186         { FC_VPORT_DISABLED,            "Disabled" },
187         { FC_VPORT_LINKDOWN,            "Linkdown" },
188         { FC_VPORT_INITIALIZING,        "Initializing" },
189         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
190         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
191         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
192         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
193         { FC_VPORT_FAILED,              "VPort Failed" },
194 };
195 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
196 #define FC_VPORTSTATE_MAX_NAMELEN       24
197
198 /* Reuse fc_vport_state enum function for vport_last_state */
199 #define get_fc_vport_last_state_name get_fc_vport_state_name
200
201
202 /* Convert fc_tgtid_binding_type values to ascii string name */
203 static const struct {
204         enum fc_tgtid_binding_type      value;
205         char                            *name;
206         int                             matchlen;
207 } fc_tgtid_binding_type_names[] = {
208         { FC_TGTID_BIND_NONE, "none", 4 },
209         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
210         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
211         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
212 };
213 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
214                 fc_tgtid_binding_type_names)
215 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
216                 fc_tgtid_binding_type_names)
217 #define FC_BINDTYPE_MAX_NAMELEN 30
218
219
220 #define fc_bitfield_name_search(title, table)                   \
221 static ssize_t                                                  \
222 get_fc_##title##_names(u32 table_key, char *buf)                \
223 {                                                               \
224         char *prefix = "";                                      \
225         ssize_t len = 0;                                        \
226         int i;                                                  \
227                                                                 \
228         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
229                 if (table[i].value & table_key) {               \
230                         len += sprintf(buf + len, "%s%s",       \
231                                 prefix, table[i].name);         \
232                         prefix = ", ";                          \
233                 }                                               \
234         }                                                       \
235         len += sprintf(buf + len, "\n");                        \
236         return len;                                             \
237 }
238
239
240 /* Convert FC_COS bit values to ascii string name */
241 static const struct {
242         u32                     value;
243         char                    *name;
244 } fc_cos_names[] = {
245         { FC_COS_CLASS1,        "Class 1" },
246         { FC_COS_CLASS2,        "Class 2" },
247         { FC_COS_CLASS3,        "Class 3" },
248         { FC_COS_CLASS4,        "Class 4" },
249         { FC_COS_CLASS6,        "Class 6" },
250 };
251 fc_bitfield_name_search(cos, fc_cos_names)
252
253
254 /* Convert FC_PORTSPEED bit values to ascii string name */
255 static const struct {
256         u32                     value;
257         char                    *name;
258 } fc_port_speed_names[] = {
259         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
260         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
261         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
262         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
263         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
264         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
265         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
266 };
267 fc_bitfield_name_search(port_speed, fc_port_speed_names)
268
269
270 static int
271 show_fc_fc4s (char *buf, u8 *fc4_list)
272 {
273         int i, len=0;
274
275         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
276                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
277         len += sprintf(buf + len, "\n");
278         return len;
279 }
280
281
282 /* Convert FC_PORT_ROLE bit values to ascii string name */
283 static const struct {
284         u32                     value;
285         char                    *name;
286 } fc_port_role_names[] = {
287         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
288         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
289         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
290 };
291 fc_bitfield_name_search(port_roles, fc_port_role_names)
292
293 /*
294  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
295  */
296 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
297 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
298 #define FC_FPORT_PORTID                 0x00000e
299 #define FC_FABCTLR_PORTID               0x00000d
300 #define FC_DIRSRVR_PORTID               0x00000c
301 #define FC_TIMESRVR_PORTID              0x00000b
302 #define FC_MGMTSRVR_PORTID              0x00000a
303
304
305 static void fc_timeout_deleted_rport(struct work_struct *work);
306 static void fc_timeout_fail_rport_io(struct work_struct *work);
307 static void fc_scsi_scan_rport(struct work_struct *work);
308
309 /*
310  * Attribute counts pre object type...
311  * Increase these values if you add attributes
312  */
313 #define FC_STARGET_NUM_ATTRS    3
314 #define FC_RPORT_NUM_ATTRS      10
315 #define FC_VPORT_NUM_ATTRS      9
316 #define FC_HOST_NUM_ATTRS       22
317
318 struct fc_internal {
319         struct scsi_transport_template t;
320         struct fc_function_template *f;
321
322         /*
323          * For attributes : each object has :
324          *   An array of the actual attributes structures
325          *   An array of null-terminated pointers to the attribute
326          *     structures - used for mid-layer interaction.
327          *
328          * The attribute containers for the starget and host are are
329          * part of the midlayer. As the remote port is specific to the
330          * fc transport, we must provide the attribute container.
331          */
332         struct device_attribute private_starget_attrs[
333                                                         FC_STARGET_NUM_ATTRS];
334         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
335
336         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
337         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
338
339         struct transport_container rport_attr_cont;
340         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
341         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
342
343         struct transport_container vport_attr_cont;
344         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
345         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
346 };
347
348 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
349
350 static int fc_target_setup(struct transport_container *tc, struct device *dev,
351                            struct device *cdev)
352 {
353         struct scsi_target *starget = to_scsi_target(dev);
354         struct fc_rport *rport = starget_to_rport(starget);
355
356         /*
357          * if parent is remote port, use values from remote port.
358          * Otherwise, this host uses the fc_transport, but not the
359          * remote port interface. As such, initialize to known non-values.
360          */
361         if (rport) {
362                 fc_starget_node_name(starget) = rport->node_name;
363                 fc_starget_port_name(starget) = rport->port_name;
364                 fc_starget_port_id(starget) = rport->port_id;
365         } else {
366                 fc_starget_node_name(starget) = -1;
367                 fc_starget_port_name(starget) = -1;
368                 fc_starget_port_id(starget) = -1;
369         }
370
371         return 0;
372 }
373
374 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
375                                "fc_transport",
376                                fc_target_setup,
377                                NULL,
378                                NULL);
379
380 static int fc_host_setup(struct transport_container *tc, struct device *dev,
381                          struct device *cdev)
382 {
383         struct Scsi_Host *shost = dev_to_shost(dev);
384         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
385
386         /*
387          * Set default values easily detected by the midlayer as
388          * failure cases.  The scsi lldd is responsible for initializing
389          * all transport attributes to valid values per host.
390          */
391         fc_host->node_name = -1;
392         fc_host->port_name = -1;
393         fc_host->permanent_port_name = -1;
394         fc_host->supported_classes = FC_COS_UNSPECIFIED;
395         memset(fc_host->supported_fc4s, 0,
396                 sizeof(fc_host->supported_fc4s));
397         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
398         fc_host->maxframe_size = -1;
399         fc_host->max_npiv_vports = 0;
400         memset(fc_host->serial_number, 0,
401                 sizeof(fc_host->serial_number));
402
403         fc_host->port_id = -1;
404         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
405         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
406         memset(fc_host->active_fc4s, 0,
407                 sizeof(fc_host->active_fc4s));
408         fc_host->speed = FC_PORTSPEED_UNKNOWN;
409         fc_host->fabric_name = -1;
410         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
411         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
412
413         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
414
415         INIT_LIST_HEAD(&fc_host->rports);
416         INIT_LIST_HEAD(&fc_host->rport_bindings);
417         INIT_LIST_HEAD(&fc_host->vports);
418         fc_host->next_rport_number = 0;
419         fc_host->next_target_id = 0;
420         fc_host->next_vport_number = 0;
421         fc_host->npiv_vports_inuse = 0;
422
423         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
424                  "fc_wq_%d", shost->host_no);
425         fc_host->work_q = alloc_workqueue(fc_host->work_q_name, 0, 0);
426         if (!fc_host->work_q)
427                 return -ENOMEM;
428
429         fc_host->dev_loss_tmo = fc_dev_loss_tmo;
430         snprintf(fc_host->devloss_work_q_name,
431                  sizeof(fc_host->devloss_work_q_name),
432                  "fc_dl_%d", shost->host_no);
433         fc_host->devloss_work_q =
434                         alloc_workqueue(fc_host->devloss_work_q_name, 0, 0);
435         if (!fc_host->devloss_work_q) {
436                 destroy_workqueue(fc_host->work_q);
437                 fc_host->work_q = NULL;
438                 return -ENOMEM;
439         }
440
441         fc_bsg_hostadd(shost, fc_host);
442         /* ignore any bsg add error - we just can't do sgio */
443
444         return 0;
445 }
446
447 static int fc_host_remove(struct transport_container *tc, struct device *dev,
448                          struct device *cdev)
449 {
450         struct Scsi_Host *shost = dev_to_shost(dev);
451         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
452
453         fc_bsg_remove(fc_host->rqst_q);
454         return 0;
455 }
456
457 static DECLARE_TRANSPORT_CLASS(fc_host_class,
458                                "fc_host",
459                                fc_host_setup,
460                                fc_host_remove,
461                                NULL);
462
463 /*
464  * Setup and Remove actions for remote ports are handled
465  * in the service functions below.
466  */
467 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
468                                "fc_remote_ports",
469                                NULL,
470                                NULL,
471                                NULL);
472
473 /*
474  * Setup and Remove actions for virtual ports are handled
475  * in the service functions below.
476  */
477 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
478                                "fc_vports",
479                                NULL,
480                                NULL,
481                                NULL);
482
483 /*
484  * Netlink Infrastructure
485  */
486
487 static atomic_t fc_event_seq;
488
489 /**
490  * fc_get_event_number - Obtain the next sequential FC event number
491  *
492  * Notes:
493  *   We could have inlined this, but it would have required fc_event_seq to
494  *   be exposed. For now, live with the subroutine call.
495  *   Atomic used to avoid lock/unlock...
496  */
497 u32
498 fc_get_event_number(void)
499 {
500         return atomic_add_return(1, &fc_event_seq);
501 }
502 EXPORT_SYMBOL(fc_get_event_number);
503
504
505 /**
506  * fc_host_post_event - called to post an even on an fc_host.
507  * @shost:              host the event occurred on
508  * @event_number:       fc event number obtained from get_fc_event_number()
509  * @event_code:         fc_host event being posted
510  * @event_data:         32bits of data for the event being posted
511  *
512  * Notes:
513  *      This routine assumes no locks are held on entry.
514  */
515 void
516 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
517                 enum fc_host_event_code event_code, u32 event_data)
518 {
519         struct sk_buff *skb;
520         struct nlmsghdr *nlh;
521         struct fc_nl_event *event;
522         const char *name;
523         u32 len, skblen;
524         int err;
525
526         if (!scsi_nl_sock) {
527                 err = -ENOENT;
528                 goto send_fail;
529         }
530
531         len = FC_NL_MSGALIGN(sizeof(*event));
532         skblen = NLMSG_SPACE(len);
533
534         skb = alloc_skb(skblen, GFP_KERNEL);
535         if (!skb) {
536                 err = -ENOBUFS;
537                 goto send_fail;
538         }
539
540         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
541                                 skblen - sizeof(*nlh), 0);
542         if (!nlh) {
543                 err = -ENOBUFS;
544                 goto send_fail_skb;
545         }
546         event = NLMSG_DATA(nlh);
547
548         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
549                                 FC_NL_ASYNC_EVENT, len);
550         event->seconds = get_seconds();
551         event->vendor_id = 0;
552         event->host_no = shost->host_no;
553         event->event_datalen = sizeof(u32);     /* bytes */
554         event->event_num = event_number;
555         event->event_code = event_code;
556         event->event_data = event_data;
557
558         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
559                         GFP_KERNEL);
560         return;
561
562 send_fail_skb:
563         kfree_skb(skb);
564 send_fail:
565         name = get_fc_host_event_code_name(event_code);
566         printk(KERN_WARNING
567                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
568                 __func__, shost->host_no,
569                 (name) ? name : "<unknown>", event_data, err);
570         return;
571 }
572 EXPORT_SYMBOL(fc_host_post_event);
573
574
575 /**
576  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
577  * @shost:              host the event occurred on
578  * @event_number:       fc event number obtained from get_fc_event_number()
579  * @data_len:           amount, in bytes, of vendor unique data
580  * @data_buf:           pointer to vendor unique data
581  * @vendor_id:          Vendor id
582  *
583  * Notes:
584  *      This routine assumes no locks are held on entry.
585  */
586 void
587 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
588                 u32 data_len, char * data_buf, u64 vendor_id)
589 {
590         struct sk_buff *skb;
591         struct nlmsghdr *nlh;
592         struct fc_nl_event *event;
593         u32 len, skblen;
594         int err;
595
596         if (!scsi_nl_sock) {
597                 err = -ENOENT;
598                 goto send_vendor_fail;
599         }
600
601         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
602         skblen = NLMSG_SPACE(len);
603
604         skb = alloc_skb(skblen, GFP_KERNEL);
605         if (!skb) {
606                 err = -ENOBUFS;
607                 goto send_vendor_fail;
608         }
609
610         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
611                                 skblen - sizeof(*nlh), 0);
612         if (!nlh) {
613                 err = -ENOBUFS;
614                 goto send_vendor_fail_skb;
615         }
616         event = NLMSG_DATA(nlh);
617
618         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
619                                 FC_NL_ASYNC_EVENT, len);
620         event->seconds = get_seconds();
621         event->vendor_id = vendor_id;
622         event->host_no = shost->host_no;
623         event->event_datalen = data_len;        /* bytes */
624         event->event_num = event_number;
625         event->event_code = FCH_EVT_VENDOR_UNIQUE;
626         memcpy(&event->event_data, data_buf, data_len);
627
628         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
629                         GFP_KERNEL);
630         return;
631
632 send_vendor_fail_skb:
633         kfree_skb(skb);
634 send_vendor_fail:
635         printk(KERN_WARNING
636                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
637                 __func__, shost->host_no, err);
638         return;
639 }
640 EXPORT_SYMBOL(fc_host_post_vendor_event);
641
642
643
644 static __init int fc_transport_init(void)
645 {
646         int error;
647
648         atomic_set(&fc_event_seq, 0);
649
650         error = transport_class_register(&fc_host_class);
651         if (error)
652                 return error;
653         error = transport_class_register(&fc_vport_class);
654         if (error)
655                 goto unreg_host_class;
656         error = transport_class_register(&fc_rport_class);
657         if (error)
658                 goto unreg_vport_class;
659         error = transport_class_register(&fc_transport_class);
660         if (error)
661                 goto unreg_rport_class;
662         return 0;
663
664 unreg_rport_class:
665         transport_class_unregister(&fc_rport_class);
666 unreg_vport_class:
667         transport_class_unregister(&fc_vport_class);
668 unreg_host_class:
669         transport_class_unregister(&fc_host_class);
670         return error;
671 }
672
673 static void __exit fc_transport_exit(void)
674 {
675         transport_class_unregister(&fc_transport_class);
676         transport_class_unregister(&fc_rport_class);
677         transport_class_unregister(&fc_host_class);
678         transport_class_unregister(&fc_vport_class);
679 }
680
681 /*
682  * FC Remote Port Attribute Management
683  */
684
685 #define fc_rport_show_function(field, format_string, sz, cast)          \
686 static ssize_t                                                          \
687 show_fc_rport_##field (struct device *dev,                              \
688                        struct device_attribute *attr, char *buf)        \
689 {                                                                       \
690         struct fc_rport *rport = transport_class_to_rport(dev);         \
691         struct Scsi_Host *shost = rport_to_shost(rport);                \
692         struct fc_internal *i = to_fc_internal(shost->transportt);      \
693         if ((i->f->get_rport_##field) &&                                \
694             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
695               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
696               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
697                 i->f->get_rport_##field(rport);                         \
698         return snprintf(buf, sz, format_string, cast rport->field);     \
699 }
700
701 #define fc_rport_store_function(field)                                  \
702 static ssize_t                                                          \
703 store_fc_rport_##field(struct device *dev,                              \
704                        struct device_attribute *attr,                   \
705                        const char *buf, size_t count)                   \
706 {                                                                       \
707         int val;                                                        \
708         struct fc_rport *rport = transport_class_to_rport(dev);         \
709         struct Scsi_Host *shost = rport_to_shost(rport);                \
710         struct fc_internal *i = to_fc_internal(shost->transportt);      \
711         char *cp;                                                       \
712         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
713             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
714             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
715                 return -EBUSY;                                          \
716         val = simple_strtoul(buf, &cp, 0);                              \
717         if (*cp && (*cp != '\n'))                                       \
718                 return -EINVAL;                                         \
719         i->f->set_rport_##field(rport, val);                            \
720         return count;                                                   \
721 }
722
723 #define fc_rport_rd_attr(field, format_string, sz)                      \
724         fc_rport_show_function(field, format_string, sz, )              \
725 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
726                          show_fc_rport_##field, NULL)
727
728 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
729         fc_rport_show_function(field, format_string, sz, (cast))        \
730 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
731                           show_fc_rport_##field, NULL)
732
733 #define fc_rport_rw_attr(field, format_string, sz)                      \
734         fc_rport_show_function(field, format_string, sz, )              \
735         fc_rport_store_function(field)                                  \
736 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
737                         show_fc_rport_##field,                          \
738                         store_fc_rport_##field)
739
740
741 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
742 static ssize_t                                                          \
743 show_fc_rport_##field (struct device *dev,                              \
744                        struct device_attribute *attr, char *buf)        \
745 {                                                                       \
746         struct fc_rport *rport = transport_class_to_rport(dev);         \
747         return snprintf(buf, sz, format_string, cast rport->field);     \
748 }
749
750 #define fc_private_rport_rd_attr(field, format_string, sz)              \
751         fc_private_rport_show_function(field, format_string, sz, )      \
752 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
753                          show_fc_rport_##field, NULL)
754
755 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
756         fc_private_rport_show_function(field, format_string, sz, (cast)) \
757 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
758                           show_fc_rport_##field, NULL)
759
760
761 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
762 static ssize_t                                                          \
763 show_fc_rport_##title (struct device *dev,                              \
764                        struct device_attribute *attr, char *buf)        \
765 {                                                                       \
766         struct fc_rport *rport = transport_class_to_rport(dev);         \
767         const char *name;                                               \
768         name = get_fc_##title##_name(rport->title);                     \
769         if (!name)                                                      \
770                 return -EINVAL;                                         \
771         return snprintf(buf, maxlen, "%s\n", name);                     \
772 }                                                                       \
773 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
774                         show_fc_rport_##title, NULL)
775
776
777 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
778         i->private_rport_attrs[count] = device_attr_rport_##field; \
779         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
780         i->private_rport_attrs[count].store = NULL;                     \
781         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
782         if (i->f->show_rport_##field)                                   \
783                 count++
784
785 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
786         i->private_rport_attrs[count] = device_attr_rport_##field; \
787         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
788         i->private_rport_attrs[count].store = NULL;                     \
789         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
790         count++
791
792 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
793         i->private_rport_attrs[count] = device_attr_rport_##field; \
794         if (!i->f->set_rport_##field) {                                 \
795                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
796                 i->private_rport_attrs[count].store = NULL;             \
797         }                                                               \
798         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
799         if (i->f->show_rport_##field)                                   \
800                 count++
801
802 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
803 {                                                                       \
804         i->private_rport_attrs[count] = device_attr_rport_##field; \
805         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
806         count++;                                                        \
807 }
808
809
810 /* The FC Transport Remote Port Attributes: */
811
812 /* Fixed Remote Port Attributes */
813
814 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
815
816 static ssize_t
817 show_fc_rport_supported_classes (struct device *dev,
818                                  struct device_attribute *attr, char *buf)
819 {
820         struct fc_rport *rport = transport_class_to_rport(dev);
821         if (rport->supported_classes == FC_COS_UNSPECIFIED)
822                 return snprintf(buf, 20, "unspecified\n");
823         return get_fc_cos_names(rport->supported_classes, buf);
824 }
825 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
826                 show_fc_rport_supported_classes, NULL);
827
828 /* Dynamic Remote Port Attributes */
829
830 /*
831  * dev_loss_tmo attribute
832  */
833 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
834 {
835         char *cp;
836
837         *val = simple_strtoul(buf, &cp, 0);
838         if ((*cp && (*cp != '\n')) || (*val < 0))
839                 return -EINVAL;
840         /*
841          * Check for overflow; dev_loss_tmo is u32
842          */
843         if (*val > UINT_MAX)
844                 return -EINVAL;
845
846         return 0;
847 }
848
849 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
850                                      unsigned long val)
851 {
852         struct Scsi_Host *shost = rport_to_shost(rport);
853         struct fc_internal *i = to_fc_internal(shost->transportt);
854
855         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
856             (rport->port_state == FC_PORTSTATE_DELETED) ||
857             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
858                 return -EBUSY;
859         /*
860          * Check for overflow; dev_loss_tmo is u32
861          */
862         if (val > UINT_MAX)
863                 return -EINVAL;
864
865         /*
866          * If fast_io_fail is off we have to cap
867          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
868          */
869         if (rport->fast_io_fail_tmo == -1 &&
870             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
871                 return -EINVAL;
872
873         i->f->set_rport_dev_loss_tmo(rport, val);
874         return 0;
875 }
876
877 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
878 static ssize_t
879 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
880                             const char *buf, size_t count)
881 {
882         struct fc_rport *rport = transport_class_to_rport(dev);
883         unsigned long val;
884         int rc;
885
886         rc = fc_str_to_dev_loss(buf, &val);
887         if (rc)
888                 return rc;
889
890         rc = fc_rport_set_dev_loss_tmo(rport, val);
891         if (rc)
892                 return rc;
893         return count;
894 }
895 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
896                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
897
898
899 /* Private Remote Port Attributes */
900
901 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
902 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
903 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
904
905 static ssize_t
906 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
907                      char *buf)
908 {
909         struct fc_rport *rport = transport_class_to_rport(dev);
910
911         /* identify any roles that are port_id specific */
912         if ((rport->port_id != -1) &&
913             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
914                                         FC_WELLKNOWN_PORTID_MASK) {
915                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
916                 case FC_FPORT_PORTID:
917                         return snprintf(buf, 30, "Fabric Port\n");
918                 case FC_FABCTLR_PORTID:
919                         return snprintf(buf, 30, "Fabric Controller\n");
920                 case FC_DIRSRVR_PORTID:
921                         return snprintf(buf, 30, "Directory Server\n");
922                 case FC_TIMESRVR_PORTID:
923                         return snprintf(buf, 30, "Time Server\n");
924                 case FC_MGMTSRVR_PORTID:
925                         return snprintf(buf, 30, "Management Server\n");
926                 default:
927                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
928                 }
929         } else {
930                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
931                         return snprintf(buf, 20, "unknown\n");
932                 return get_fc_port_roles_names(rport->roles, buf);
933         }
934 }
935 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
936                 show_fc_rport_roles, NULL);
937
938 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
939 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
940
941 /*
942  * fast_io_fail_tmo attribute
943  */
944 static ssize_t
945 show_fc_rport_fast_io_fail_tmo (struct device *dev,
946                                 struct device_attribute *attr, char *buf)
947 {
948         struct fc_rport *rport = transport_class_to_rport(dev);
949
950         if (rport->fast_io_fail_tmo == -1)
951                 return snprintf(buf, 5, "off\n");
952         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
953 }
954
955 static ssize_t
956 store_fc_rport_fast_io_fail_tmo(struct device *dev,
957                                 struct device_attribute *attr, const char *buf,
958                                 size_t count)
959 {
960         int val;
961         char *cp;
962         struct fc_rport *rport = transport_class_to_rport(dev);
963
964         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
965             (rport->port_state == FC_PORTSTATE_DELETED) ||
966             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
967                 return -EBUSY;
968         if (strncmp(buf, "off", 3) == 0)
969                 rport->fast_io_fail_tmo = -1;
970         else {
971                 val = simple_strtoul(buf, &cp, 0);
972                 if ((*cp && (*cp != '\n')) || (val < 0))
973                         return -EINVAL;
974                 /*
975                  * Cap fast_io_fail by dev_loss_tmo or
976                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
977                  */
978                 if ((val >= rport->dev_loss_tmo) ||
979                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
980                         return -EINVAL;
981
982                 rport->fast_io_fail_tmo = val;
983         }
984         return count;
985 }
986 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
987         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
988
989
990 /*
991  * FC SCSI Target Attribute Management
992  */
993
994 /*
995  * Note: in the target show function we recognize when the remote
996  *  port is in the hierarchy and do not allow the driver to get
997  *  involved in sysfs functions. The driver only gets involved if
998  *  it's the "old" style that doesn't use rports.
999  */
1000 #define fc_starget_show_function(field, format_string, sz, cast)        \
1001 static ssize_t                                                          \
1002 show_fc_starget_##field (struct device *dev,                            \
1003                          struct device_attribute *attr, char *buf)      \
1004 {                                                                       \
1005         struct scsi_target *starget = transport_class_to_starget(dev);  \
1006         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
1007         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1008         struct fc_rport *rport = starget_to_rport(starget);             \
1009         if (rport)                                                      \
1010                 fc_starget_##field(starget) = rport->field;             \
1011         else if (i->f->get_starget_##field)                             \
1012                 i->f->get_starget_##field(starget);                     \
1013         return snprintf(buf, sz, format_string,                         \
1014                 cast fc_starget_##field(starget));                      \
1015 }
1016
1017 #define fc_starget_rd_attr(field, format_string, sz)                    \
1018         fc_starget_show_function(field, format_string, sz, )            \
1019 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1020                          show_fc_starget_##field, NULL)
1021
1022 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
1023         fc_starget_show_function(field, format_string, sz, (cast))      \
1024 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1025                           show_fc_starget_##field, NULL)
1026
1027 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
1028         i->private_starget_attrs[count] = device_attr_starget_##field; \
1029         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
1030         i->private_starget_attrs[count].store = NULL;                   \
1031         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1032         if (i->f->show_starget_##field)                                 \
1033                 count++
1034
1035 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1036         i->private_starget_attrs[count] = device_attr_starget_##field; \
1037         if (!i->f->set_starget_##field) {                               \
1038                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1039                 i->private_starget_attrs[count].store = NULL;           \
1040         }                                                               \
1041         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1042         if (i->f->show_starget_##field)                                 \
1043                 count++
1044
1045 /* The FC Transport SCSI Target Attributes: */
1046 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1047 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1048 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1049
1050
1051 /*
1052  * FC Virtual Port Attribute Management
1053  */
1054
1055 #define fc_vport_show_function(field, format_string, sz, cast)          \
1056 static ssize_t                                                          \
1057 show_fc_vport_##field (struct device *dev,                              \
1058                        struct device_attribute *attr, char *buf)        \
1059 {                                                                       \
1060         struct fc_vport *vport = transport_class_to_vport(dev);         \
1061         struct Scsi_Host *shost = vport_to_shost(vport);                \
1062         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1063         if ((i->f->get_vport_##field) &&                                \
1064             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1065                 i->f->get_vport_##field(vport);                         \
1066         return snprintf(buf, sz, format_string, cast vport->field);     \
1067 }
1068
1069 #define fc_vport_store_function(field)                                  \
1070 static ssize_t                                                          \
1071 store_fc_vport_##field(struct device *dev,                              \
1072                        struct device_attribute *attr,                   \
1073                        const char *buf, size_t count)                   \
1074 {                                                                       \
1075         int val;                                                        \
1076         struct fc_vport *vport = transport_class_to_vport(dev);         \
1077         struct Scsi_Host *shost = vport_to_shost(vport);                \
1078         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1079         char *cp;                                                       \
1080         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1081                 return -EBUSY;                                          \
1082         val = simple_strtoul(buf, &cp, 0);                              \
1083         if (*cp && (*cp != '\n'))                                       \
1084                 return -EINVAL;                                         \
1085         i->f->set_vport_##field(vport, val);                            \
1086         return count;                                                   \
1087 }
1088
1089 #define fc_vport_store_str_function(field, slen)                        \
1090 static ssize_t                                                          \
1091 store_fc_vport_##field(struct device *dev,                              \
1092                        struct device_attribute *attr,                   \
1093                        const char *buf, size_t count)                   \
1094 {                                                                       \
1095         struct fc_vport *vport = transport_class_to_vport(dev);         \
1096         struct Scsi_Host *shost = vport_to_shost(vport);                \
1097         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1098         unsigned int cnt=count;                                         \
1099                                                                         \
1100         /* count may include a LF at end of string */                   \
1101         if (buf[cnt-1] == '\n')                                         \
1102                 cnt--;                                                  \
1103         if (cnt > ((slen) - 1))                                         \
1104                 return -EINVAL;                                         \
1105         memcpy(vport->field, buf, cnt);                                 \
1106         i->f->set_vport_##field(vport);                                 \
1107         return count;                                                   \
1108 }
1109
1110 #define fc_vport_rd_attr(field, format_string, sz)                      \
1111         fc_vport_show_function(field, format_string, sz, )              \
1112 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1113                          show_fc_vport_##field, NULL)
1114
1115 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1116         fc_vport_show_function(field, format_string, sz, (cast))        \
1117 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1118                           show_fc_vport_##field, NULL)
1119
1120 #define fc_vport_rw_attr(field, format_string, sz)                      \
1121         fc_vport_show_function(field, format_string, sz, )              \
1122         fc_vport_store_function(field)                                  \
1123 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1124                         show_fc_vport_##field,                          \
1125                         store_fc_vport_##field)
1126
1127 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1128 static ssize_t                                                          \
1129 show_fc_vport_##field (struct device *dev,                              \
1130                        struct device_attribute *attr, char *buf)        \
1131 {                                                                       \
1132         struct fc_vport *vport = transport_class_to_vport(dev);         \
1133         return snprintf(buf, sz, format_string, cast vport->field);     \
1134 }
1135
1136 #define fc_private_vport_store_u32_function(field)                      \
1137 static ssize_t                                                          \
1138 store_fc_vport_##field(struct device *dev,                              \
1139                        struct device_attribute *attr,                   \
1140                        const char *buf, size_t count)                   \
1141 {                                                                       \
1142         u32 val;                                                        \
1143         struct fc_vport *vport = transport_class_to_vport(dev);         \
1144         char *cp;                                                       \
1145         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1146                 return -EBUSY;                                          \
1147         val = simple_strtoul(buf, &cp, 0);                              \
1148         if (*cp && (*cp != '\n'))                                       \
1149                 return -EINVAL;                                         \
1150         vport->field = val;                                             \
1151         return count;                                                   \
1152 }
1153
1154
1155 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1156         fc_private_vport_show_function(field, format_string, sz, )      \
1157 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1158                          show_fc_vport_##field, NULL)
1159
1160 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1161         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1162 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1163                           show_fc_vport_##field, NULL)
1164
1165 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1166         fc_private_vport_show_function(field, format_string, sz, )      \
1167         fc_private_vport_store_u32_function(field)                      \
1168 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1169                         show_fc_vport_##field,                          \
1170                         store_fc_vport_##field)
1171
1172
1173 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1174 static ssize_t                                                          \
1175 show_fc_vport_##title (struct device *dev,                              \
1176                        struct device_attribute *attr,                   \
1177                        char *buf)                                       \
1178 {                                                                       \
1179         struct fc_vport *vport = transport_class_to_vport(dev);         \
1180         const char *name;                                               \
1181         name = get_fc_##title##_name(vport->title);                     \
1182         if (!name)                                                      \
1183                 return -EINVAL;                                         \
1184         return snprintf(buf, maxlen, "%s\n", name);                     \
1185 }                                                                       \
1186 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1187                         show_fc_vport_##title, NULL)
1188
1189
1190 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1191         i->private_vport_attrs[count] = device_attr_vport_##field; \
1192         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1193         i->private_vport_attrs[count].store = NULL;                     \
1194         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1195         if (i->f->get_##field)                                          \
1196                 count++
1197         /* NOTE: Above MACRO differs: checks function not show bit */
1198
1199 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1200         i->private_vport_attrs[count] = device_attr_vport_##field; \
1201         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1202         i->private_vport_attrs[count].store = NULL;                     \
1203         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1204         count++
1205
1206 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1207         i->private_vport_attrs[count] = device_attr_vport_##field; \
1208         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1209         if (i->f->field)                                                \
1210                 count++
1211         /* NOTE: Above MACRO differs: checks function */
1212
1213 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1214         i->private_vport_attrs[count] = device_attr_vport_##field; \
1215         if (!i->f->set_vport_##field) {                                 \
1216                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1217                 i->private_vport_attrs[count].store = NULL;             \
1218         }                                                               \
1219         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1220         count++
1221         /* NOTE: Above MACRO differs: does not check show bit */
1222
1223 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1224 {                                                                       \
1225         i->private_vport_attrs[count] = device_attr_vport_##field; \
1226         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1227         count++;                                                        \
1228 }
1229
1230
1231 /* The FC Transport Virtual Port Attributes: */
1232
1233 /* Fixed Virtual Port Attributes */
1234
1235 /* Dynamic Virtual Port Attributes */
1236
1237 /* Private Virtual Port Attributes */
1238
1239 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1240 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1241 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1242 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1243
1244 static ssize_t
1245 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1246                      char *buf)
1247 {
1248         struct fc_vport *vport = transport_class_to_vport(dev);
1249
1250         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1251                 return snprintf(buf, 20, "unknown\n");
1252         return get_fc_port_roles_names(vport->roles, buf);
1253 }
1254 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1255
1256 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1257
1258 fc_private_vport_show_function(symbolic_name, "%s\n",
1259                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1260 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1261 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1262                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1263
1264 static ssize_t
1265 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1266                       const char *buf, size_t count)
1267 {
1268         struct fc_vport *vport = transport_class_to_vport(dev);
1269         struct Scsi_Host *shost = vport_to_shost(vport);
1270         unsigned long flags;
1271
1272         spin_lock_irqsave(shost->host_lock, flags);
1273         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1274                 spin_unlock_irqrestore(shost->host_lock, flags);
1275                 return -EBUSY;
1276         }
1277         vport->flags |= FC_VPORT_DELETING;
1278         spin_unlock_irqrestore(shost->host_lock, flags);
1279
1280         fc_queue_work(shost, &vport->vport_delete_work);
1281         return count;
1282 }
1283 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1284                         NULL, store_fc_vport_delete);
1285
1286
1287 /*
1288  * Enable/Disable vport
1289  *  Write "1" to disable, write "0" to enable
1290  */
1291 static ssize_t
1292 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1293                        const char *buf,
1294                            size_t count)
1295 {
1296         struct fc_vport *vport = transport_class_to_vport(dev);
1297         struct Scsi_Host *shost = vport_to_shost(vport);
1298         struct fc_internal *i = to_fc_internal(shost->transportt);
1299         int stat;
1300
1301         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1302                 return -EBUSY;
1303
1304         if (*buf == '0') {
1305                 if (vport->vport_state != FC_VPORT_DISABLED)
1306                         return -EALREADY;
1307         } else if (*buf == '1') {
1308                 if (vport->vport_state == FC_VPORT_DISABLED)
1309                         return -EALREADY;
1310         } else
1311                 return -EINVAL;
1312
1313         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1314         return stat ? stat : count;
1315 }
1316 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1317                         NULL, store_fc_vport_disable);
1318
1319
1320 /*
1321  * Host Attribute Management
1322  */
1323
1324 #define fc_host_show_function(field, format_string, sz, cast)           \
1325 static ssize_t                                                          \
1326 show_fc_host_##field (struct device *dev,                               \
1327                       struct device_attribute *attr, char *buf)         \
1328 {                                                                       \
1329         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1330         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1331         if (i->f->get_host_##field)                                     \
1332                 i->f->get_host_##field(shost);                          \
1333         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1334 }
1335
1336 #define fc_host_store_function(field)                                   \
1337 static ssize_t                                                          \
1338 store_fc_host_##field(struct device *dev,                               \
1339                       struct device_attribute *attr,                    \
1340                       const char *buf,  size_t count)                   \
1341 {                                                                       \
1342         int val;                                                        \
1343         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1344         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1345         char *cp;                                                       \
1346                                                                         \
1347         val = simple_strtoul(buf, &cp, 0);                              \
1348         if (*cp && (*cp != '\n'))                                       \
1349                 return -EINVAL;                                         \
1350         i->f->set_host_##field(shost, val);                             \
1351         return count;                                                   \
1352 }
1353
1354 #define fc_host_store_str_function(field, slen)                         \
1355 static ssize_t                                                          \
1356 store_fc_host_##field(struct device *dev,                               \
1357                       struct device_attribute *attr,                    \
1358                       const char *buf, size_t count)                    \
1359 {                                                                       \
1360         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1361         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1362         unsigned int cnt=count;                                         \
1363                                                                         \
1364         /* count may include a LF at end of string */                   \
1365         if (buf[cnt-1] == '\n')                                         \
1366                 cnt--;                                                  \
1367         if (cnt > ((slen) - 1))                                         \
1368                 return -EINVAL;                                         \
1369         memcpy(fc_host_##field(shost), buf, cnt);                       \
1370         i->f->set_host_##field(shost);                                  \
1371         return count;                                                   \
1372 }
1373
1374 #define fc_host_rd_attr(field, format_string, sz)                       \
1375         fc_host_show_function(field, format_string, sz, )               \
1376 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1377                          show_fc_host_##field, NULL)
1378
1379 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1380         fc_host_show_function(field, format_string, sz, (cast))         \
1381 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1382                           show_fc_host_##field, NULL)
1383
1384 #define fc_host_rw_attr(field, format_string, sz)                       \
1385         fc_host_show_function(field, format_string, sz, )               \
1386         fc_host_store_function(field)                                   \
1387 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1388                         show_fc_host_##field,                           \
1389                         store_fc_host_##field)
1390
1391 #define fc_host_rd_enum_attr(title, maxlen)                             \
1392 static ssize_t                                                          \
1393 show_fc_host_##title (struct device *dev,                               \
1394                       struct device_attribute *attr, char *buf)         \
1395 {                                                                       \
1396         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1397         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1398         const char *name;                                               \
1399         if (i->f->get_host_##title)                                     \
1400                 i->f->get_host_##title(shost);                          \
1401         name = get_fc_##title##_name(fc_host_##title(shost));           \
1402         if (!name)                                                      \
1403                 return -EINVAL;                                         \
1404         return snprintf(buf, maxlen, "%s\n", name);                     \
1405 }                                                                       \
1406 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1407
1408 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1409         i->private_host_attrs[count] = device_attr_host_##field;        \
1410         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1411         i->private_host_attrs[count].store = NULL;                      \
1412         i->host_attrs[count] = &i->private_host_attrs[count];           \
1413         if (i->f->show_host_##field)                                    \
1414                 count++
1415
1416 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1417         i->private_host_attrs[count] = device_attr_host_##field;        \
1418         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1419         i->private_host_attrs[count].store = NULL;                      \
1420         i->host_attrs[count] = &i->private_host_attrs[count];           \
1421         count++
1422
1423 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1424         i->private_host_attrs[count] = device_attr_host_##field;        \
1425         if (!i->f->set_host_##field) {                                  \
1426                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1427                 i->private_host_attrs[count].store = NULL;              \
1428         }                                                               \
1429         i->host_attrs[count] = &i->private_host_attrs[count];           \
1430         if (i->f->show_host_##field)                                    \
1431                 count++
1432
1433
1434 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1435 static ssize_t                                                          \
1436 show_fc_host_##field (struct device *dev,                               \
1437                       struct device_attribute *attr, char *buf)         \
1438 {                                                                       \
1439         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1440         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1441 }
1442
1443 #define fc_private_host_rd_attr(field, format_string, sz)               \
1444         fc_private_host_show_function(field, format_string, sz, )       \
1445 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1446                          show_fc_host_##field, NULL)
1447
1448 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1449         fc_private_host_show_function(field, format_string, sz, (cast)) \
1450 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1451                           show_fc_host_##field, NULL)
1452
1453 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1454         i->private_host_attrs[count] = device_attr_host_##field;        \
1455         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1456         i->private_host_attrs[count].store = NULL;                      \
1457         i->host_attrs[count] = &i->private_host_attrs[count];           \
1458         count++
1459
1460 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1461 {                                                                       \
1462         i->private_host_attrs[count] = device_attr_host_##field;        \
1463         i->host_attrs[count] = &i->private_host_attrs[count];           \
1464         count++;                                                        \
1465 }
1466
1467
1468 /* Fixed Host Attributes */
1469
1470 static ssize_t
1471 show_fc_host_supported_classes (struct device *dev,
1472                                 struct device_attribute *attr, char *buf)
1473 {
1474         struct Scsi_Host *shost = transport_class_to_shost(dev);
1475
1476         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1477                 return snprintf(buf, 20, "unspecified\n");
1478
1479         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1480 }
1481 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1482                 show_fc_host_supported_classes, NULL);
1483
1484 static ssize_t
1485 show_fc_host_supported_fc4s (struct device *dev,
1486                              struct device_attribute *attr, char *buf)
1487 {
1488         struct Scsi_Host *shost = transport_class_to_shost(dev);
1489         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1490 }
1491 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1492                 show_fc_host_supported_fc4s, NULL);
1493
1494 static ssize_t
1495 show_fc_host_supported_speeds (struct device *dev,
1496                                struct device_attribute *attr, char *buf)
1497 {
1498         struct Scsi_Host *shost = transport_class_to_shost(dev);
1499
1500         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1501                 return snprintf(buf, 20, "unknown\n");
1502
1503         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1504 }
1505 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1506                 show_fc_host_supported_speeds, NULL);
1507
1508
1509 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1510 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1511 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1512                              unsigned long long);
1513 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1514 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1515 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1516
1517
1518 /* Dynamic Host Attributes */
1519
1520 static ssize_t
1521 show_fc_host_active_fc4s (struct device *dev,
1522                           struct device_attribute *attr, char *buf)
1523 {
1524         struct Scsi_Host *shost = transport_class_to_shost(dev);
1525         struct fc_internal *i = to_fc_internal(shost->transportt);
1526
1527         if (i->f->get_host_active_fc4s)
1528                 i->f->get_host_active_fc4s(shost);
1529
1530         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1531 }
1532 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1533                 show_fc_host_active_fc4s, NULL);
1534
1535 static ssize_t
1536 show_fc_host_speed (struct device *dev,
1537                     struct device_attribute *attr, char *buf)
1538 {
1539         struct Scsi_Host *shost = transport_class_to_shost(dev);
1540         struct fc_internal *i = to_fc_internal(shost->transportt);
1541
1542         if (i->f->get_host_speed)
1543                 i->f->get_host_speed(shost);
1544
1545         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1546                 return snprintf(buf, 20, "unknown\n");
1547
1548         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1549 }
1550 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1551                 show_fc_host_speed, NULL);
1552
1553
1554 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1555 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1556 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1557 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1558 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1559
1560 fc_private_host_show_function(system_hostname, "%s\n",
1561                 FC_SYMBOLIC_NAME_SIZE + 1, )
1562 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1563 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1564                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1565
1566
1567 /* Private Host Attributes */
1568
1569 static ssize_t
1570 show_fc_private_host_tgtid_bind_type(struct device *dev,
1571                                      struct device_attribute *attr, char *buf)
1572 {
1573         struct Scsi_Host *shost = transport_class_to_shost(dev);
1574         const char *name;
1575
1576         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1577         if (!name)
1578                 return -EINVAL;
1579         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1580 }
1581
1582 #define get_list_head_entry(pos, head, member)          \
1583         pos = list_entry((head)->next, typeof(*pos), member)
1584
1585 static ssize_t
1586 store_fc_private_host_tgtid_bind_type(struct device *dev,
1587         struct device_attribute *attr, const char *buf, size_t count)
1588 {
1589         struct Scsi_Host *shost = transport_class_to_shost(dev);
1590         struct fc_rport *rport;
1591         enum fc_tgtid_binding_type val;
1592         unsigned long flags;
1593
1594         if (get_fc_tgtid_bind_type_match(buf, &val))
1595                 return -EINVAL;
1596
1597         /* if changing bind type, purge all unused consistent bindings */
1598         if (val != fc_host_tgtid_bind_type(shost)) {
1599                 spin_lock_irqsave(shost->host_lock, flags);
1600                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1601                         get_list_head_entry(rport,
1602                                 &fc_host_rport_bindings(shost), peers);
1603                         list_del(&rport->peers);
1604                         rport->port_state = FC_PORTSTATE_DELETED;
1605                         fc_queue_work(shost, &rport->rport_delete_work);
1606                 }
1607                 spin_unlock_irqrestore(shost->host_lock, flags);
1608         }
1609
1610         fc_host_tgtid_bind_type(shost) = val;
1611         return count;
1612 }
1613
1614 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1615                         show_fc_private_host_tgtid_bind_type,
1616                         store_fc_private_host_tgtid_bind_type);
1617
1618 static ssize_t
1619 store_fc_private_host_issue_lip(struct device *dev,
1620         struct device_attribute *attr, const char *buf, size_t count)
1621 {
1622         struct Scsi_Host *shost = transport_class_to_shost(dev);
1623         struct fc_internal *i = to_fc_internal(shost->transportt);
1624         int ret;
1625
1626         /* ignore any data value written to the attribute */
1627         if (i->f->issue_fc_host_lip) {
1628                 ret = i->f->issue_fc_host_lip(shost);
1629                 return ret ? ret: count;
1630         }
1631
1632         return -ENOENT;
1633 }
1634
1635 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1636                         store_fc_private_host_issue_lip);
1637
1638 static ssize_t
1639 store_fc_private_host_dev_loss_tmo(struct device *dev,
1640                                    struct device_attribute *attr,
1641                                    const char *buf, size_t count)
1642 {
1643         struct Scsi_Host *shost = transport_class_to_shost(dev);
1644         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1645         struct fc_rport *rport;
1646         unsigned long val, flags;
1647         int rc;
1648
1649         rc = fc_str_to_dev_loss(buf, &val);
1650         if (rc)
1651                 return rc;
1652
1653         fc_host_dev_loss_tmo(shost) = val;
1654         spin_lock_irqsave(shost->host_lock, flags);
1655         list_for_each_entry(rport, &fc_host->rports, peers)
1656                 fc_rport_set_dev_loss_tmo(rport, val);
1657         spin_unlock_irqrestore(shost->host_lock, flags);
1658         return count;
1659 }
1660
1661 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1662 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1663                       show_fc_host_dev_loss_tmo,
1664                       store_fc_private_host_dev_loss_tmo);
1665
1666 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1667
1668 /*
1669  * Host Statistics Management
1670  */
1671
1672 /* Show a given an attribute in the statistics group */
1673 static ssize_t
1674 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1675 {
1676         struct Scsi_Host *shost = transport_class_to_shost(dev);
1677         struct fc_internal *i = to_fc_internal(shost->transportt);
1678         struct fc_host_statistics *stats;
1679         ssize_t ret = -ENOENT;
1680
1681         if (offset > sizeof(struct fc_host_statistics) ||
1682             offset % sizeof(u64) != 0)
1683                 WARN_ON(1);
1684
1685         if (i->f->get_fc_host_stats) {
1686                 stats = (i->f->get_fc_host_stats)(shost);
1687                 if (stats)
1688                         ret = snprintf(buf, 20, "0x%llx\n",
1689                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1690         }
1691         return ret;
1692 }
1693
1694
1695 /* generate a read-only statistics attribute */
1696 #define fc_host_statistic(name)                                         \
1697 static ssize_t show_fcstat_##name(struct device *cd,                    \
1698                                   struct device_attribute *attr,        \
1699                                   char *buf)                            \
1700 {                                                                       \
1701         return fc_stat_show(cd, buf,                                    \
1702                             offsetof(struct fc_host_statistics, name)); \
1703 }                                                                       \
1704 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1705
1706 fc_host_statistic(seconds_since_last_reset);
1707 fc_host_statistic(tx_frames);
1708 fc_host_statistic(tx_words);
1709 fc_host_statistic(rx_frames);
1710 fc_host_statistic(rx_words);
1711 fc_host_statistic(lip_count);
1712 fc_host_statistic(nos_count);
1713 fc_host_statistic(error_frames);
1714 fc_host_statistic(dumped_frames);
1715 fc_host_statistic(link_failure_count);
1716 fc_host_statistic(loss_of_sync_count);
1717 fc_host_statistic(loss_of_signal_count);
1718 fc_host_statistic(prim_seq_protocol_err_count);
1719 fc_host_statistic(invalid_tx_word_count);
1720 fc_host_statistic(invalid_crc_count);
1721 fc_host_statistic(fcp_input_requests);
1722 fc_host_statistic(fcp_output_requests);
1723 fc_host_statistic(fcp_control_requests);
1724 fc_host_statistic(fcp_input_megabytes);
1725 fc_host_statistic(fcp_output_megabytes);
1726
1727 static ssize_t
1728 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1729                     const char *buf, size_t count)
1730 {
1731         struct Scsi_Host *shost = transport_class_to_shost(dev);
1732         struct fc_internal *i = to_fc_internal(shost->transportt);
1733
1734         /* ignore any data value written to the attribute */
1735         if (i->f->reset_fc_host_stats) {
1736                 i->f->reset_fc_host_stats(shost);
1737                 return count;
1738         }
1739
1740         return -ENOENT;
1741 }
1742 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1743                                 fc_reset_statistics);
1744
1745 static struct attribute *fc_statistics_attrs[] = {
1746         &device_attr_host_seconds_since_last_reset.attr,
1747         &device_attr_host_tx_frames.attr,
1748         &device_attr_host_tx_words.attr,
1749         &device_attr_host_rx_frames.attr,
1750         &device_attr_host_rx_words.attr,
1751         &device_attr_host_lip_count.attr,
1752         &device_attr_host_nos_count.attr,
1753         &device_attr_host_error_frames.attr,
1754         &device_attr_host_dumped_frames.attr,
1755         &device_attr_host_link_failure_count.attr,
1756         &device_attr_host_loss_of_sync_count.attr,
1757         &device_attr_host_loss_of_signal_count.attr,
1758         &device_attr_host_prim_seq_protocol_err_count.attr,
1759         &device_attr_host_invalid_tx_word_count.attr,
1760         &device_attr_host_invalid_crc_count.attr,
1761         &device_attr_host_fcp_input_requests.attr,
1762         &device_attr_host_fcp_output_requests.attr,
1763         &device_attr_host_fcp_control_requests.attr,
1764         &device_attr_host_fcp_input_megabytes.attr,
1765         &device_attr_host_fcp_output_megabytes.attr,
1766         &device_attr_host_reset_statistics.attr,
1767         NULL
1768 };
1769
1770 static struct attribute_group fc_statistics_group = {
1771         .name = "statistics",
1772         .attrs = fc_statistics_attrs,
1773 };
1774
1775
1776 /* Host Vport Attributes */
1777
1778 static int
1779 fc_parse_wwn(const char *ns, u64 *nm)
1780 {
1781         unsigned int i, j;
1782         u8 wwn[8];
1783
1784         memset(wwn, 0, sizeof(wwn));
1785
1786         /* Validate and store the new name */
1787         for (i=0, j=0; i < 16; i++) {
1788                 int value;
1789
1790                 value = hex_to_bin(*ns++);
1791                 if (value >= 0)
1792                         j = (j << 4) | value;
1793                 else
1794                         return -EINVAL;
1795                 if (i % 2) {
1796                         wwn[i/2] = j & 0xff;
1797                         j = 0;
1798                 }
1799         }
1800
1801         *nm = wwn_to_u64(wwn);
1802
1803         return 0;
1804 }
1805
1806
1807 /*
1808  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1809  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1810  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1811  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1812  */
1813 static ssize_t
1814 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1815                            const char *buf, size_t count)
1816 {
1817         struct Scsi_Host *shost = transport_class_to_shost(dev);
1818         struct fc_vport_identifiers vid;
1819         struct fc_vport *vport;
1820         unsigned int cnt=count;
1821         int stat;
1822
1823         memset(&vid, 0, sizeof(vid));
1824
1825         /* count may include a LF at end of string */
1826         if (buf[cnt-1] == '\n')
1827                 cnt--;
1828
1829         /* validate we have enough characters for WWPN */
1830         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1831                 return -EINVAL;
1832
1833         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1834         if (stat)
1835                 return stat;
1836
1837         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1838         if (stat)
1839                 return stat;
1840
1841         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1842         vid.vport_type = FC_PORTTYPE_NPIV;
1843         /* vid.symbolic_name is already zero/NULL's */
1844         vid.disable = false;            /* always enabled */
1845
1846         /* we only allow support on Channel 0 !!! */
1847         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1848         return stat ? stat : count;
1849 }
1850 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1851                         store_fc_host_vport_create);
1852
1853
1854 /*
1855  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1856  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1857  * The WWNs are specified as hex characters, and may *not* contain
1858  * any prefixes (e.g. 0x, x, etc)
1859  */
1860 static ssize_t
1861 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1862                            const char *buf, size_t count)
1863 {
1864         struct Scsi_Host *shost = transport_class_to_shost(dev);
1865         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1866         struct fc_vport *vport;
1867         u64 wwpn, wwnn;
1868         unsigned long flags;
1869         unsigned int cnt=count;
1870         int stat, match;
1871
1872         /* count may include a LF at end of string */
1873         if (buf[cnt-1] == '\n')
1874                 cnt--;
1875
1876         /* validate we have enough characters for WWPN */
1877         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1878                 return -EINVAL;
1879
1880         stat = fc_parse_wwn(&buf[0], &wwpn);
1881         if (stat)
1882                 return stat;
1883
1884         stat = fc_parse_wwn(&buf[17], &wwnn);
1885         if (stat)
1886                 return stat;
1887
1888         spin_lock_irqsave(shost->host_lock, flags);
1889         match = 0;
1890         /* we only allow support on Channel 0 !!! */
1891         list_for_each_entry(vport, &fc_host->vports, peers) {
1892                 if ((vport->channel == 0) &&
1893                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1894                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1895                                 break;
1896                         vport->flags |= FC_VPORT_DELETING;
1897                         match = 1;
1898                         break;
1899                 }
1900         }
1901         spin_unlock_irqrestore(shost->host_lock, flags);
1902
1903         if (!match)
1904                 return -ENODEV;
1905
1906         stat = fc_vport_terminate(vport);
1907         return stat ? stat : count;
1908 }
1909 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1910                         store_fc_host_vport_delete);
1911
1912
1913 static int fc_host_match(struct attribute_container *cont,
1914                           struct device *dev)
1915 {
1916         struct Scsi_Host *shost;
1917         struct fc_internal *i;
1918
1919         if (!scsi_is_host_device(dev))
1920                 return 0;
1921
1922         shost = dev_to_shost(dev);
1923         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1924             != &fc_host_class.class)
1925                 return 0;
1926
1927         i = to_fc_internal(shost->transportt);
1928
1929         return &i->t.host_attrs.ac == cont;
1930 }
1931
1932 static int fc_target_match(struct attribute_container *cont,
1933                             struct device *dev)
1934 {
1935         struct Scsi_Host *shost;
1936         struct fc_internal *i;
1937
1938         if (!scsi_is_target_device(dev))
1939                 return 0;
1940
1941         shost = dev_to_shost(dev->parent);
1942         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1943             != &fc_host_class.class)
1944                 return 0;
1945
1946         i = to_fc_internal(shost->transportt);
1947
1948         return &i->t.target_attrs.ac == cont;
1949 }
1950
1951 static void fc_rport_dev_release(struct device *dev)
1952 {
1953         struct fc_rport *rport = dev_to_rport(dev);
1954         put_device(dev->parent);
1955         kfree(rport);
1956 }
1957
1958 int scsi_is_fc_rport(const struct device *dev)
1959 {
1960         return dev->release == fc_rport_dev_release;
1961 }
1962 EXPORT_SYMBOL(scsi_is_fc_rport);
1963
1964 static int fc_rport_match(struct attribute_container *cont,
1965                             struct device *dev)
1966 {
1967         struct Scsi_Host *shost;
1968         struct fc_internal *i;
1969
1970         if (!scsi_is_fc_rport(dev))
1971                 return 0;
1972
1973         shost = dev_to_shost(dev->parent);
1974         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1975             != &fc_host_class.class)
1976                 return 0;
1977
1978         i = to_fc_internal(shost->transportt);
1979
1980         return &i->rport_attr_cont.ac == cont;
1981 }
1982
1983
1984 static void fc_vport_dev_release(struct device *dev)
1985 {
1986         struct fc_vport *vport = dev_to_vport(dev);
1987         put_device(dev->parent);                /* release kobj parent */
1988         kfree(vport);
1989 }
1990
1991 int scsi_is_fc_vport(const struct device *dev)
1992 {
1993         return dev->release == fc_vport_dev_release;
1994 }
1995 EXPORT_SYMBOL(scsi_is_fc_vport);
1996
1997 static int fc_vport_match(struct attribute_container *cont,
1998                             struct device *dev)
1999 {
2000         struct fc_vport *vport;
2001         struct Scsi_Host *shost;
2002         struct fc_internal *i;
2003
2004         if (!scsi_is_fc_vport(dev))
2005                 return 0;
2006         vport = dev_to_vport(dev);
2007
2008         shost = vport_to_shost(vport);
2009         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2010             != &fc_host_class.class)
2011                 return 0;
2012
2013         i = to_fc_internal(shost->transportt);
2014         return &i->vport_attr_cont.ac == cont;
2015 }
2016
2017
2018 /**
2019  * fc_timed_out - FC Transport I/O timeout intercept handler
2020  * @scmd:       The SCSI command which timed out
2021  *
2022  * This routine protects against error handlers getting invoked while a
2023  * rport is in a blocked state, typically due to a temporarily loss of
2024  * connectivity. If the error handlers are allowed to proceed, requests
2025  * to abort i/o, reset the target, etc will likely fail as there is no way
2026  * to communicate with the device to perform the requested function. These
2027  * failures may result in the midlayer taking the device offline, requiring
2028  * manual intervention to restore operation.
2029  *
2030  * This routine, called whenever an i/o times out, validates the state of
2031  * the underlying rport. If the rport is blocked, it returns
2032  * EH_RESET_TIMER, which will continue to reschedule the timeout.
2033  * Eventually, either the device will return, or devloss_tmo will fire,
2034  * and when the timeout then fires, it will be handled normally.
2035  * If the rport is not blocked, normal error handling continues.
2036  *
2037  * Notes:
2038  *      This routine assumes no locks are held on entry.
2039  */
2040 static enum blk_eh_timer_return
2041 fc_timed_out(struct scsi_cmnd *scmd)
2042 {
2043         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2044
2045         if (rport->port_state == FC_PORTSTATE_BLOCKED)
2046                 return BLK_EH_RESET_TIMER;
2047
2048         return BLK_EH_NOT_HANDLED;
2049 }
2050
2051 /*
2052  * Called by fc_user_scan to locate an rport on the shost that
2053  * matches the channel and target id, and invoke scsi_scan_target()
2054  * on the rport.
2055  */
2056 static void
2057 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2058 {
2059         struct fc_rport *rport;
2060         unsigned long flags;
2061
2062         spin_lock_irqsave(shost->host_lock, flags);
2063
2064         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2065                 if (rport->scsi_target_id == -1)
2066                         continue;
2067
2068                 if (rport->port_state != FC_PORTSTATE_ONLINE)
2069                         continue;
2070
2071                 if ((channel == rport->channel) &&
2072                     (id == rport->scsi_target_id)) {
2073                         spin_unlock_irqrestore(shost->host_lock, flags);
2074                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
2075                         return;
2076                 }
2077         }
2078
2079         spin_unlock_irqrestore(shost->host_lock, flags);
2080 }
2081
2082 /*
2083  * Called via sysfs scan routines. Necessary, as the FC transport
2084  * wants to place all target objects below the rport object. So this
2085  * routine must invoke the scsi_scan_target() routine with the rport
2086  * object as the parent.
2087  */
2088 static int
2089 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2090 {
2091         uint chlo, chhi;
2092         uint tgtlo, tgthi;
2093
2094         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2095             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2096             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2097                 return -EINVAL;
2098
2099         if (channel == SCAN_WILD_CARD) {
2100                 chlo = 0;
2101                 chhi = shost->max_channel + 1;
2102         } else {
2103                 chlo = channel;
2104                 chhi = channel + 1;
2105         }
2106
2107         if (id == SCAN_WILD_CARD) {
2108                 tgtlo = 0;
2109                 tgthi = shost->max_id;
2110         } else {
2111                 tgtlo = id;
2112                 tgthi = id + 1;
2113         }
2114
2115         for ( ; chlo < chhi; chlo++)
2116                 for ( ; tgtlo < tgthi; tgtlo++)
2117                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2118
2119         return 0;
2120 }
2121
2122 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2123                                 int result)
2124 {
2125         struct fc_internal *i = to_fc_internal(shost->transportt);
2126         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2127 }
2128
2129 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2130 {
2131         struct fc_internal *i = to_fc_internal(shost->transportt);
2132         return i->f->it_nexus_response(shost, nexus, result);
2133 }
2134
2135 struct scsi_transport_template *
2136 fc_attach_transport(struct fc_function_template *ft)
2137 {
2138         int count;
2139         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2140                                         GFP_KERNEL);
2141
2142         if (unlikely(!i))
2143                 return NULL;
2144
2145         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2146         i->t.target_attrs.ac.class = &fc_transport_class.class;
2147         i->t.target_attrs.ac.match = fc_target_match;
2148         i->t.target_size = sizeof(struct fc_starget_attrs);
2149         transport_container_register(&i->t.target_attrs);
2150
2151         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2152         i->t.host_attrs.ac.class = &fc_host_class.class;
2153         i->t.host_attrs.ac.match = fc_host_match;
2154         i->t.host_size = sizeof(struct fc_host_attrs);
2155         if (ft->get_fc_host_stats)
2156                 i->t.host_attrs.statistics = &fc_statistics_group;
2157         transport_container_register(&i->t.host_attrs);
2158
2159         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2160         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2161         i->rport_attr_cont.ac.match = fc_rport_match;
2162         transport_container_register(&i->rport_attr_cont);
2163
2164         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2165         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2166         i->vport_attr_cont.ac.match = fc_vport_match;
2167         transport_container_register(&i->vport_attr_cont);
2168
2169         i->f = ft;
2170
2171         /* Transport uses the shost workq for scsi scanning */
2172         i->t.create_work_queue = 1;
2173
2174         i->t.eh_timed_out = fc_timed_out;
2175
2176         i->t.user_scan = fc_user_scan;
2177
2178         /* target-mode drivers' functions */
2179         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2180         i->t.it_nexus_response = fc_it_nexus_response;
2181
2182         /*
2183          * Setup SCSI Target Attributes.
2184          */
2185         count = 0;
2186         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2187         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2188         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2189
2190         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2191
2192         i->starget_attrs[count] = NULL;
2193
2194
2195         /*
2196          * Setup SCSI Host Attributes.
2197          */
2198         count=0;
2199         SETUP_HOST_ATTRIBUTE_RD(node_name);
2200         SETUP_HOST_ATTRIBUTE_RD(port_name);
2201         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2202         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2203         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2204         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2205         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2206         if (ft->vport_create) {
2207                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2208                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2209         }
2210         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2211
2212         SETUP_HOST_ATTRIBUTE_RD(port_id);
2213         SETUP_HOST_ATTRIBUTE_RD(port_type);
2214         SETUP_HOST_ATTRIBUTE_RD(port_state);
2215         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2216         SETUP_HOST_ATTRIBUTE_RD(speed);
2217         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2218         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2219         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2220
2221         /* Transport-managed attributes */
2222         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2223         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2224         if (ft->issue_fc_host_lip)
2225                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2226         if (ft->vport_create)
2227                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2228         if (ft->vport_delete)
2229                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2230
2231         BUG_ON(count > FC_HOST_NUM_ATTRS);
2232
2233         i->host_attrs[count] = NULL;
2234
2235         /*
2236          * Setup Remote Port Attributes.
2237          */
2238         count=0;
2239         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2240         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2241         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2242         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2243         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2244         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2245         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2246         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2247         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2248         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2249
2250         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2251
2252         i->rport_attrs[count] = NULL;
2253
2254         /*
2255          * Setup Virtual Port Attributes.
2256          */
2257         count=0;
2258         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2259         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2260         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2261         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2262         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2263         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2264         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2265         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2266         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2267
2268         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2269
2270         i->vport_attrs[count] = NULL;
2271
2272         return &i->t;
2273 }
2274 EXPORT_SYMBOL(fc_attach_transport);
2275
2276 void fc_release_transport(struct scsi_transport_template *t)
2277 {
2278         struct fc_internal *i = to_fc_internal(t);
2279
2280         transport_container_unregister(&i->t.target_attrs);
2281         transport_container_unregister(&i->t.host_attrs);
2282         transport_container_unregister(&i->rport_attr_cont);
2283         transport_container_unregister(&i->vport_attr_cont);
2284
2285         kfree(i);
2286 }
2287 EXPORT_SYMBOL(fc_release_transport);
2288
2289 /**
2290  * fc_queue_work - Queue work to the fc_host workqueue.
2291  * @shost:      Pointer to Scsi_Host bound to fc_host.
2292  * @work:       Work to queue for execution.
2293  *
2294  * Return value:
2295  *      1 - work queued for execution
2296  *      0 - work is already queued
2297  *      -EINVAL - work queue doesn't exist
2298  */
2299 static int
2300 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2301 {
2302         if (unlikely(!fc_host_work_q(shost))) {
2303                 printk(KERN_ERR
2304                         "ERROR: FC host '%s' attempted to queue work, "
2305                         "when no workqueue created.\n", shost->hostt->name);
2306                 dump_stack();
2307
2308                 return -EINVAL;
2309         }
2310
2311         return queue_work(fc_host_work_q(shost), work);
2312 }
2313
2314 /**
2315  * fc_flush_work - Flush a fc_host's workqueue.
2316  * @shost:      Pointer to Scsi_Host bound to fc_host.
2317  */
2318 static void
2319 fc_flush_work(struct Scsi_Host *shost)
2320 {
2321         if (!fc_host_work_q(shost)) {
2322                 printk(KERN_ERR
2323                         "ERROR: FC host '%s' attempted to flush work, "
2324                         "when no workqueue created.\n", shost->hostt->name);
2325                 dump_stack();
2326                 return;
2327         }
2328
2329         flush_workqueue(fc_host_work_q(shost));
2330 }
2331
2332 /**
2333  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2334  * @shost:      Pointer to Scsi_Host bound to fc_host.
2335  * @work:       Work to queue for execution.
2336  * @delay:      jiffies to delay the work queuing
2337  *
2338  * Return value:
2339  *      1 on success / 0 already queued / < 0 for error
2340  */
2341 static int
2342 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2343                                 unsigned long delay)
2344 {
2345         if (unlikely(!fc_host_devloss_work_q(shost))) {
2346                 printk(KERN_ERR
2347                         "ERROR: FC host '%s' attempted to queue work, "
2348                         "when no workqueue created.\n", shost->hostt->name);
2349                 dump_stack();
2350
2351                 return -EINVAL;
2352         }
2353
2354         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2355 }
2356
2357 /**
2358  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2359  * @shost:      Pointer to Scsi_Host bound to fc_host.
2360  */
2361 static void
2362 fc_flush_devloss(struct Scsi_Host *shost)
2363 {
2364         if (!fc_host_devloss_work_q(shost)) {
2365                 printk(KERN_ERR
2366                         "ERROR: FC host '%s' attempted to flush work, "
2367                         "when no workqueue created.\n", shost->hostt->name);
2368                 dump_stack();
2369                 return;
2370         }
2371
2372         flush_workqueue(fc_host_devloss_work_q(shost));
2373 }
2374
2375
2376 /**
2377  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2378  * @shost:      Which &Scsi_Host
2379  *
2380  * This routine is expected to be called immediately preceding the
2381  * a driver's call to scsi_remove_host().
2382  *
2383  * WARNING: A driver utilizing the fc_transport, which fails to call
2384  *   this routine prior to scsi_remove_host(), will leave dangling
2385  *   objects in /sys/class/fc_remote_ports. Access to any of these
2386  *   objects can result in a system crash !!!
2387  *
2388  * Notes:
2389  *      This routine assumes no locks are held on entry.
2390  */
2391 void
2392 fc_remove_host(struct Scsi_Host *shost)
2393 {
2394         struct fc_vport *vport = NULL, *next_vport = NULL;
2395         struct fc_rport *rport = NULL, *next_rport = NULL;
2396         struct workqueue_struct *work_q;
2397         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2398         unsigned long flags;
2399
2400         spin_lock_irqsave(shost->host_lock, flags);
2401
2402         /* Remove any vports */
2403         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2404                 fc_queue_work(shost, &vport->vport_delete_work);
2405
2406         /* Remove any remote ports */
2407         list_for_each_entry_safe(rport, next_rport,
2408                         &fc_host->rports, peers) {
2409                 list_del(&rport->peers);
2410                 rport->port_state = FC_PORTSTATE_DELETED;
2411                 fc_queue_work(shost, &rport->rport_delete_work);
2412         }
2413
2414         list_for_each_entry_safe(rport, next_rport,
2415                         &fc_host->rport_bindings, peers) {
2416                 list_del(&rport->peers);
2417                 rport->port_state = FC_PORTSTATE_DELETED;
2418                 fc_queue_work(shost, &rport->rport_delete_work);
2419         }
2420
2421         spin_unlock_irqrestore(shost->host_lock, flags);
2422
2423         /* flush all scan work items */
2424         scsi_flush_work(shost);
2425
2426         /* flush all stgt delete, and rport delete work items, then kill it  */
2427         if (fc_host->work_q) {
2428                 work_q = fc_host->work_q;
2429                 fc_host->work_q = NULL;
2430                 destroy_workqueue(work_q);
2431         }
2432
2433         /* flush all devloss work items, then kill it  */
2434         if (fc_host->devloss_work_q) {
2435                 work_q = fc_host->devloss_work_q;
2436                 fc_host->devloss_work_q = NULL;
2437                 destroy_workqueue(work_q);
2438         }
2439 }
2440 EXPORT_SYMBOL(fc_remove_host);
2441
2442 static void fc_terminate_rport_io(struct fc_rport *rport)
2443 {
2444         struct Scsi_Host *shost = rport_to_shost(rport);
2445         struct fc_internal *i = to_fc_internal(shost->transportt);
2446
2447         /* Involve the LLDD if possible to terminate all io on the rport. */
2448         if (i->f->terminate_rport_io)
2449                 i->f->terminate_rport_io(rport);
2450
2451         /*
2452          * must unblock to flush queued IO. The caller will have set
2453          * the port_state or flags, so that fc_remote_port_chkready will
2454          * fail IO.
2455          */
2456         scsi_target_unblock(&rport->dev);
2457 }
2458
2459 /**
2460  * fc_starget_delete - called to delete the scsi descendants of an rport
2461  * @work:       remote port to be operated on.
2462  *
2463  * Deletes target and all sdevs.
2464  */
2465 static void
2466 fc_starget_delete(struct work_struct *work)
2467 {
2468         struct fc_rport *rport =
2469                 container_of(work, struct fc_rport, stgt_delete_work);
2470
2471         fc_terminate_rport_io(rport);
2472         scsi_remove_target(&rport->dev);
2473 }
2474
2475
2476 /**
2477  * fc_rport_final_delete - finish rport termination and delete it.
2478  * @work:       remote port to be deleted.
2479  */
2480 static void
2481 fc_rport_final_delete(struct work_struct *work)
2482 {
2483         struct fc_rport *rport =
2484                 container_of(work, struct fc_rport, rport_delete_work);
2485         struct device *dev = &rport->dev;
2486         struct Scsi_Host *shost = rport_to_shost(rport);
2487         struct fc_internal *i = to_fc_internal(shost->transportt);
2488         unsigned long flags;
2489         int do_callback = 0;
2490
2491         fc_terminate_rport_io(rport);
2492
2493         /*
2494          * if a scan is pending, flush the SCSI Host work_q so that
2495          * that we can reclaim the rport scan work element.
2496          */
2497         if (rport->flags & FC_RPORT_SCAN_PENDING)
2498                 scsi_flush_work(shost);
2499
2500         /*
2501          * Cancel any outstanding timers. These should really exist
2502          * only when rmmod'ing the LLDD and we're asking for
2503          * immediate termination of the rports
2504          */
2505         spin_lock_irqsave(shost->host_lock, flags);
2506         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2507                 spin_unlock_irqrestore(shost->host_lock, flags);
2508                 if (!cancel_delayed_work(&rport->fail_io_work))
2509                         fc_flush_devloss(shost);
2510                 if (!cancel_delayed_work(&rport->dev_loss_work))
2511                         fc_flush_devloss(shost);
2512                 spin_lock_irqsave(shost->host_lock, flags);
2513                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2514         }
2515         spin_unlock_irqrestore(shost->host_lock, flags);
2516
2517         /* Delete SCSI target and sdevs */
2518         if (rport->scsi_target_id != -1)
2519                 fc_starget_delete(&rport->stgt_delete_work);
2520
2521         /*
2522          * Notify the driver that the rport is now dead. The LLDD will
2523          * also guarantee that any communication to the rport is terminated
2524          *
2525          * Avoid this call if we already called it when we preserved the
2526          * rport for the binding.
2527          */
2528         spin_lock_irqsave(shost->host_lock, flags);
2529         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2530             (i->f->dev_loss_tmo_callbk)) {
2531                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2532                 do_callback = 1;
2533         }
2534         spin_unlock_irqrestore(shost->host_lock, flags);
2535
2536         if (do_callback)
2537                 i->f->dev_loss_tmo_callbk(rport);
2538
2539         fc_bsg_remove(rport->rqst_q);
2540
2541         transport_remove_device(dev);
2542         device_del(dev);
2543         transport_destroy_device(dev);
2544         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2545         put_device(dev);                        /* for self-reference */
2546 }
2547
2548
2549 /**
2550  * fc_rport_create - allocates and creates a remote FC port.
2551  * @shost:      scsi host the remote port is connected to.
2552  * @channel:    Channel on shost port connected to.
2553  * @ids:        The world wide names, fc address, and FC4 port
2554  *              roles for the remote port.
2555  *
2556  * Allocates and creates the remoter port structure, including the
2557  * class and sysfs creation.
2558  *
2559  * Notes:
2560  *      This routine assumes no locks are held on entry.
2561  */
2562 static struct fc_rport *
2563 fc_rport_create(struct Scsi_Host *shost, int channel,
2564         struct fc_rport_identifiers  *ids)
2565 {
2566         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2567         struct fc_internal *fci = to_fc_internal(shost->transportt);
2568         struct fc_rport *rport;
2569         struct device *dev;
2570         unsigned long flags;
2571         int error;
2572         size_t size;
2573
2574         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2575         rport = kzalloc(size, GFP_KERNEL);
2576         if (unlikely(!rport)) {
2577                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2578                 return NULL;
2579         }
2580
2581         rport->maxframe_size = -1;
2582         rport->supported_classes = FC_COS_UNSPECIFIED;
2583         rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2584         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2585         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2586         rport->port_id = ids->port_id;
2587         rport->roles = ids->roles;
2588         rport->port_state = FC_PORTSTATE_ONLINE;
2589         if (fci->f->dd_fcrport_size)
2590                 rport->dd_data = &rport[1];
2591         rport->channel = channel;
2592         rport->fast_io_fail_tmo = -1;
2593
2594         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2595         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2596         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2597         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2598         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2599
2600         spin_lock_irqsave(shost->host_lock, flags);
2601
2602         rport->number = fc_host->next_rport_number++;
2603         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2604                 rport->scsi_target_id = fc_host->next_target_id++;
2605         else
2606                 rport->scsi_target_id = -1;
2607         list_add_tail(&rport->peers, &fc_host->rports);
2608         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2609
2610         spin_unlock_irqrestore(shost->host_lock, flags);
2611
2612         dev = &rport->dev;
2613         device_initialize(dev);                 /* takes self reference */
2614         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2615         dev->release = fc_rport_dev_release;
2616         dev_set_name(dev, "rport-%d:%d-%d",
2617                      shost->host_no, channel, rport->number);
2618         transport_setup_device(dev);
2619
2620         error = device_add(dev);
2621         if (error) {
2622                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2623                 goto delete_rport;
2624         }
2625         transport_add_device(dev);
2626         transport_configure_device(dev);
2627
2628         fc_bsg_rportadd(shost, rport);
2629         /* ignore any bsg add error - we just can't do sgio */
2630
2631         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2632                 /* initiate a scan of the target */
2633                 rport->flags |= FC_RPORT_SCAN_PENDING;
2634                 scsi_queue_work(shost, &rport->scan_work);
2635         }
2636
2637         return rport;
2638
2639 delete_rport:
2640         transport_destroy_device(dev);
2641         spin_lock_irqsave(shost->host_lock, flags);
2642         list_del(&rport->peers);
2643         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2644         spin_unlock_irqrestore(shost->host_lock, flags);
2645         put_device(dev->parent);
2646         kfree(rport);
2647         return NULL;
2648 }
2649
2650 /**
2651  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2652  * @shost:      scsi host the remote port is connected to.
2653  * @channel:    Channel on shost port connected to.
2654  * @ids:        The world wide names, fc address, and FC4 port
2655  *              roles for the remote port.
2656  *
2657  * The LLDD calls this routine to notify the transport of the existence
2658  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2659  * of the port, it's FC address (port_id), and the FC4 roles that are
2660  * active for the port.
2661  *
2662  * For ports that are FCP targets (aka scsi targets), the FC transport
2663  * maintains consistent target id bindings on behalf of the LLDD.
2664  * A consistent target id binding is an assignment of a target id to
2665  * a remote port identifier, which persists while the scsi host is
2666  * attached. The remote port can disappear, then later reappear, and
2667  * it's target id assignment remains the same. This allows for shifts
2668  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2669  * changes to the scsi subsystem which is based on scsi host number and
2670  * target id values.  Bindings are only valid during the attachment of
2671  * the scsi host. If the host detaches, then later re-attaches, target
2672  * id bindings may change.
2673  *
2674  * This routine is responsible for returning a remote port structure.
2675  * The routine will search the list of remote ports it maintains
2676  * internally on behalf of consistent target id mappings. If found, the
2677  * remote port structure will be reused. Otherwise, a new remote port
2678  * structure will be allocated.
2679  *
2680  * Whenever a remote port is allocated, a new fc_remote_port class
2681  * device is created.
2682  *
2683  * Should not be called from interrupt context.
2684  *
2685  * Notes:
2686  *      This routine assumes no locks are held on entry.
2687  */
2688 struct fc_rport *
2689 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2690         struct fc_rport_identifiers  *ids)
2691 {
2692         struct fc_internal *fci = to_fc_internal(shost->transportt);
2693         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2694         struct fc_rport *rport;
2695         unsigned long flags;
2696         int match = 0;
2697
2698         /* ensure any stgt delete functions are done */
2699         fc_flush_work(shost);
2700
2701         /*
2702          * Search the list of "active" rports, for an rport that has been
2703          * deleted, but we've held off the real delete while the target
2704          * is in a "blocked" state.
2705          */
2706         spin_lock_irqsave(shost->host_lock, flags);
2707
2708         list_for_each_entry(rport, &fc_host->rports, peers) {
2709
2710                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2711                         (rport->channel == channel)) {
2712
2713                         switch (fc_host->tgtid_bind_type) {
2714                         case FC_TGTID_BIND_BY_WWPN:
2715                         case FC_TGTID_BIND_NONE:
2716                                 if (rport->port_name == ids->port_name)
2717                                         match = 1;
2718                                 break;
2719                         case FC_TGTID_BIND_BY_WWNN:
2720                                 if (rport->node_name == ids->node_name)
2721                                         match = 1;
2722                                 break;
2723                         case FC_TGTID_BIND_BY_ID:
2724                                 if (rport->port_id == ids->port_id)
2725                                         match = 1;
2726                                 break;
2727                         }
2728
2729                         if (match) {
2730
2731                                 memcpy(&rport->node_name, &ids->node_name,
2732                                         sizeof(rport->node_name));
2733                                 memcpy(&rport->port_name, &ids->port_name,
2734                                         sizeof(rport->port_name));
2735                                 rport->port_id = ids->port_id;
2736
2737                                 rport->port_state = FC_PORTSTATE_ONLINE;
2738                                 rport->roles = ids->roles;
2739
2740                                 spin_unlock_irqrestore(shost->host_lock, flags);
2741
2742                                 if (fci->f->dd_fcrport_size)
2743                                         memset(rport->dd_data, 0,
2744                                                 fci->f->dd_fcrport_size);
2745
2746                                 /*
2747                                  * If we were not a target, cancel the
2748                                  * io terminate and rport timers, and
2749                                  * we're done.
2750                                  *
2751                                  * If we were a target, but our new role
2752                                  * doesn't indicate a target, leave the
2753                                  * timers running expecting the role to
2754                                  * change as the target fully logs in. If
2755                                  * it doesn't, the target will be torn down.
2756                                  *
2757                                  * If we were a target, and our role shows
2758                                  * we're still a target, cancel the timers
2759                                  * and kick off a scan.
2760                                  */
2761
2762                                 /* was a target, not in roles */
2763                                 if ((rport->scsi_target_id != -1) &&
2764                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2765                                         return rport;
2766
2767                                 /*
2768                                  * Stop the fail io and dev_loss timers.
2769                                  * If they flush, the port_state will
2770                                  * be checked and will NOOP the function.
2771                                  */
2772                                 if (!cancel_delayed_work(&rport->fail_io_work))
2773                                         fc_flush_devloss(shost);
2774                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2775                                         fc_flush_devloss(shost);
2776
2777                                 spin_lock_irqsave(shost->host_lock, flags);
2778
2779                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2780                                                   FC_RPORT_DEVLOSS_PENDING |
2781                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2782
2783                                 /* if target, initiate a scan */
2784                                 if (rport->scsi_target_id != -1) {
2785                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2786                                         scsi_queue_work(shost,
2787                                                         &rport->scan_work);
2788                                         spin_unlock_irqrestore(shost->host_lock,
2789                                                         flags);
2790                                         scsi_target_unblock(&rport->dev);
2791                                 } else
2792                                         spin_unlock_irqrestore(shost->host_lock,
2793                                                         flags);
2794
2795                                 fc_bsg_goose_queue(rport);
2796
2797                                 return rport;
2798                         }
2799                 }
2800         }
2801
2802         /*
2803          * Search the bindings array
2804          * Note: if never a FCP target, you won't be on this list
2805          */
2806         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2807
2808                 /* search for a matching consistent binding */
2809
2810                 list_for_each_entry(rport, &fc_host->rport_bindings,
2811                                         peers) {
2812                         if (rport->channel != channel)
2813                                 continue;
2814
2815                         switch (fc_host->tgtid_bind_type) {
2816                         case FC_TGTID_BIND_BY_WWPN:
2817                                 if (rport->port_name == ids->port_name)
2818                                         match = 1;
2819                                 break;
2820                         case FC_TGTID_BIND_BY_WWNN:
2821                                 if (rport->node_name == ids->node_name)
2822                                         match = 1;
2823                                 break;
2824                         case FC_TGTID_BIND_BY_ID:
2825                                 if (rport->port_id == ids->port_id)
2826                                         match = 1;
2827                                 break;
2828                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2829                                 break;
2830                         }
2831
2832                         if (match) {
2833                                 list_move_tail(&rport->peers, &fc_host->rports);
2834                                 break;
2835                         }
2836                 }
2837
2838                 if (match) {
2839                         memcpy(&rport->node_name, &ids->node_name,
2840                                 sizeof(rport->node_name));
2841                         memcpy(&rport->port_name, &ids->port_name,
2842                                 sizeof(rport->port_name));
2843                         rport->port_id = ids->port_id;
2844                         rport->roles = ids->roles;
2845                         rport->port_state = FC_PORTSTATE_ONLINE;
2846                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2847
2848                         if (fci->f->dd_fcrport_size)
2849                                 memset(rport->dd_data, 0,
2850                                                 fci->f->dd_fcrport_size);
2851
2852                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2853                                 /* initiate a scan of the target */
2854                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2855                                 scsi_queue_work(shost, &rport->scan_work);
2856                                 spin_unlock_irqrestore(shost->host_lock, flags);
2857                                 scsi_target_unblock(&rport->dev);
2858                         } else
2859                                 spin_unlock_irqrestore(shost->host_lock, flags);
2860
2861                         return rport;
2862                 }
2863         }
2864
2865         spin_unlock_irqrestore(shost->host_lock, flags);
2866
2867         /* No consistent binding found - create new remote port entry */
2868         rport = fc_rport_create(shost, channel, ids);
2869
2870         return rport;
2871 }
2872 EXPORT_SYMBOL(fc_remote_port_add);
2873
2874
2875 /**
2876  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2877  * @rport:      The remote port that no longer exists
2878  *
2879  * The LLDD calls this routine to notify the transport that a remote
2880  * port is no longer part of the topology. Note: Although a port
2881  * may no longer be part of the topology, it may persist in the remote
2882  * ports displayed by the fc_host. We do this under 2 conditions:
2883  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2884  *   This allows the port to temporarily disappear, then reappear without
2885  *   disrupting the SCSI device tree attached to it. During the "blocked"
2886  *   period the port will still exist.
2887  * 2) If the port was a scsi target and disappears for longer than we
2888  *   expect, we'll delete the port and the tear down the SCSI device tree
2889  *   attached to it. However, we want to semi-persist the target id assigned
2890  *   to that port if it eventually does exist. The port structure will
2891  *   remain (although with minimal information) so that the target id
2892  *   bindings remails.
2893  *
2894  * If the remote port is not an FCP Target, it will be fully torn down
2895  * and deallocated, including the fc_remote_port class device.
2896  *
2897  * If the remote port is an FCP Target, the port will be placed in a
2898  * temporary blocked state. From the LLDD's perspective, the rport no
2899  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2900  * exists, but all sdevs on it are blocked from further I/O. The following
2901  * is then expected.
2902  *
2903  *   If the remote port does not return (signaled by a LLDD call to
2904  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2905  *   scsi target is removed - killing all outstanding i/o and removing the
2906  *   scsi devices attached ot it. The port structure will be marked Not
2907  *   Present and be partially cleared, leaving only enough information to
2908  *   recognize the remote port relative to the scsi target id binding if
2909  *   it later appears.  The port will remain as long as there is a valid
2910  *   binding (e.g. until the user changes the binding type or unloads the
2911  *   scsi host with the binding).
2912  *
2913  *   If the remote port returns within the dev_loss_tmo value (and matches
2914  *   according to the target id binding type), the port structure will be
2915  *   reused. If it is no longer a SCSI target, the target will be torn
2916  *   down. If it continues to be a SCSI target, then the target will be
2917  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2918  *   to ensure that all luns are detected.
2919  *
2920  * Called from normal process context only - cannot be called from interrupt.
2921  *
2922  * Notes:
2923  *      This routine assumes no locks are held on entry.
2924  */
2925 void
2926 fc_remote_port_delete(struct fc_rport  *rport)
2927 {
2928         struct Scsi_Host *shost = rport_to_shost(rport);
2929         unsigned long timeout = rport->dev_loss_tmo;
2930         unsigned long flags;
2931
2932         /*
2933          * No need to flush the fc_host work_q's, as all adds are synchronous.
2934          *
2935          * We do need to reclaim the rport scan work element, so eventually
2936          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2937          * there's still a scan pending.
2938          */
2939
2940         spin_lock_irqsave(shost->host_lock, flags);
2941
2942         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2943                 spin_unlock_irqrestore(shost->host_lock, flags);
2944                 return;
2945         }
2946
2947         /*
2948          * In the past, we if this was not an FCP-Target, we would
2949          * unconditionally just jump to deleting the rport.
2950          * However, rports can be used as node containers by the LLDD,
2951          * and its not appropriate to just terminate the rport at the
2952          * first sign of a loss in connectivity. The LLDD may want to
2953          * send ELS traffic to re-validate the login. If the rport is
2954          * immediately deleted, it makes it inappropriate for a node
2955          * container.
2956          * So... we now unconditionally wait dev_loss_tmo before
2957          * destroying an rport.
2958          */
2959
2960         rport->port_state = FC_PORTSTATE_BLOCKED;
2961
2962         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2963
2964         spin_unlock_irqrestore(shost->host_lock, flags);
2965
2966         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2967             shost->active_mode & MODE_TARGET)
2968                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2969
2970         scsi_target_block(&rport->dev);
2971
2972         /* see if we need to kill io faster than waiting for device loss */
2973         if ((rport->fast_io_fail_tmo != -1) &&
2974             (rport->fast_io_fail_tmo < timeout))
2975                 fc_queue_devloss_work(shost, &rport->fail_io_work,
2976                                         rport->fast_io_fail_tmo * HZ);
2977
2978         /* cap the length the devices can be blocked until they are deleted */
2979         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
2980 }
2981 EXPORT_SYMBOL(fc_remote_port_delete);
2982
2983 /**
2984  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
2985  * @rport:      The remote port that changed.
2986  * @roles:      New roles for this port.
2987  *
2988  * Description: The LLDD calls this routine to notify the transport that the
2989  * roles on a remote port may have changed. The largest effect of this is
2990  * if a port now becomes a FCP Target, it must be allocated a
2991  * scsi target id.  If the port is no longer a FCP target, any
2992  * scsi target id value assigned to it will persist in case the
2993  * role changes back to include FCP Target. No changes in the scsi
2994  * midlayer will be invoked if the role changes (in the expectation
2995  * that the role will be resumed. If it doesn't normal error processing
2996  * will take place).
2997  *
2998  * Should not be called from interrupt context.
2999  *
3000  * Notes:
3001  *      This routine assumes no locks are held on entry.
3002  */
3003 void
3004 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
3005 {
3006         struct Scsi_Host *shost = rport_to_shost(rport);
3007         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3008         unsigned long flags;
3009         int create = 0;
3010         int ret;
3011
3012         spin_lock_irqsave(shost->host_lock, flags);
3013         if (roles & FC_PORT_ROLE_FCP_TARGET) {
3014                 if (rport->scsi_target_id == -1) {
3015                         rport->scsi_target_id = fc_host->next_target_id++;
3016                         create = 1;
3017                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3018                         create = 1;
3019         } else if (shost->active_mode & MODE_TARGET) {
3020                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
3021                                              (char *)&rport->node_name);
3022                 if (ret)
3023                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
3024                                ret);
3025         }
3026
3027         rport->roles = roles;
3028
3029         spin_unlock_irqrestore(shost->host_lock, flags);
3030
3031         if (create) {
3032                 /*
3033                  * There may have been a delete timer running on the
3034                  * port. Ensure that it is cancelled as we now know
3035                  * the port is an FCP Target.
3036                  * Note: we know the rport is exists and in an online
3037                  *  state as the LLDD would not have had an rport
3038                  *  reference to pass us.
3039                  *
3040                  * Take no action on the del_timer failure as the state
3041                  * machine state change will validate the
3042                  * transaction.
3043                  */
3044                 if (!cancel_delayed_work(&rport->fail_io_work))
3045                         fc_flush_devloss(shost);
3046                 if (!cancel_delayed_work(&rport->dev_loss_work))
3047                         fc_flush_devloss(shost);
3048
3049                 spin_lock_irqsave(shost->host_lock, flags);
3050                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3051                                   FC_RPORT_DEVLOSS_PENDING);
3052                 spin_unlock_irqrestore(shost->host_lock, flags);
3053
3054                 /* ensure any stgt delete functions are done */
3055                 fc_flush_work(shost);
3056
3057                 /* initiate a scan of the target */
3058                 spin_lock_irqsave(shost->host_lock, flags);
3059                 rport->flags |= FC_RPORT_SCAN_PENDING;
3060                 scsi_queue_work(shost, &rport->scan_work);
3061                 spin_unlock_irqrestore(shost->host_lock, flags);
3062                 scsi_target_unblock(&rport->dev);
3063         }
3064 }
3065 EXPORT_SYMBOL(fc_remote_port_rolechg);
3066
3067 /**
3068  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3069  * @work:       rport target that failed to reappear in the allotted time.
3070  *
3071  * Description: An attempt to delete a remote port blocks, and if it fails
3072  *              to return in the allotted time this gets called.
3073  */
3074 static void
3075 fc_timeout_deleted_rport(struct work_struct *work)
3076 {
3077         struct fc_rport *rport =
3078                 container_of(work, struct fc_rport, dev_loss_work.work);
3079         struct Scsi_Host *shost = rport_to_shost(rport);
3080         struct fc_internal *i = to_fc_internal(shost->transportt);
3081         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3082         unsigned long flags;
3083         int do_callback = 0;
3084
3085         spin_lock_irqsave(shost->host_lock, flags);
3086
3087         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3088
3089         /*
3090          * If the port is ONLINE, then it came back. If it was a SCSI
3091          * target, validate it still is. If not, tear down the
3092          * scsi_target on it.
3093          */
3094         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3095             (rport->scsi_target_id != -1) &&
3096             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3097                 dev_printk(KERN_ERR, &rport->dev,
3098                         "blocked FC remote port time out: no longer"
3099                         " a FCP target, removing starget\n");
3100                 spin_unlock_irqrestore(shost->host_lock, flags);
3101                 scsi_target_unblock(&rport->dev);
3102                 fc_queue_work(shost, &rport->stgt_delete_work);
3103                 return;
3104         }
3105
3106         /* NOOP state - we're flushing workq's */
3107         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3108                 spin_unlock_irqrestore(shost->host_lock, flags);
3109                 dev_printk(KERN_ERR, &rport->dev,
3110                         "blocked FC remote port time out: leaving"
3111                         " rport%s alone\n",
3112                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3113                 return;
3114         }
3115
3116         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3117             (rport->scsi_target_id == -1)) {
3118                 list_del(&rport->peers);
3119                 rport->port_state = FC_PORTSTATE_DELETED;
3120                 dev_printk(KERN_ERR, &rport->dev,
3121                         "blocked FC remote port time out: removing"
3122                         " rport%s\n",
3123                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3124                 fc_queue_work(shost, &rport->rport_delete_work);
3125                 spin_unlock_irqrestore(shost->host_lock, flags);
3126                 return;
3127         }
3128
3129         dev_printk(KERN_ERR, &rport->dev,
3130                 "blocked FC remote port time out: removing target and "
3131                 "saving binding\n");
3132
3133         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3134
3135         /*
3136          * Note: We do not remove or clear the hostdata area. This allows
3137          *   host-specific target data to persist along with the
3138          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3139          */
3140
3141         /*
3142          * Reinitialize port attributes that may change if the port comes back.
3143          */
3144         rport->maxframe_size = -1;
3145         rport->supported_classes = FC_COS_UNSPECIFIED;
3146         rport->roles = FC_PORT_ROLE_UNKNOWN;
3147         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3148         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3149
3150         /*
3151          * Pre-emptively kill I/O rather than waiting for the work queue
3152          * item to teardown the starget. (FCOE libFC folks prefer this
3153          * and to have the rport_port_id still set when it's done).
3154          */
3155         spin_unlock_irqrestore(shost->host_lock, flags);
3156         fc_terminate_rport_io(rport);
3157
3158         spin_lock_irqsave(shost->host_lock, flags);
3159
3160         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3161
3162                 /* remove the identifiers that aren't used in the consisting binding */
3163                 switch (fc_host->tgtid_bind_type) {
3164                 case FC_TGTID_BIND_BY_WWPN:
3165                         rport->node_name = -1;
3166                         rport->port_id = -1;
3167                         break;
3168                 case FC_TGTID_BIND_BY_WWNN:
3169                         rport->port_name = -1;
3170                         rport->port_id = -1;
3171                         break;
3172                 case FC_TGTID_BIND_BY_ID:
3173                         rport->node_name = -1;
3174                         rport->port_name = -1;
3175                         break;
3176                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3177                         break;
3178                 }
3179
3180                 /*
3181                  * As this only occurs if the remote port (scsi target)
3182                  * went away and didn't come back - we'll remove
3183                  * all attached scsi devices.
3184                  */
3185                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3186                 fc_queue_work(shost, &rport->stgt_delete_work);
3187
3188                 do_callback = 1;
3189         }
3190
3191         spin_unlock_irqrestore(shost->host_lock, flags);
3192
3193         /*
3194          * Notify the driver that the rport is now dead. The LLDD will
3195          * also guarantee that any communication to the rport is terminated
3196          *
3197          * Note: we set the CALLBK_DONE flag above to correspond
3198          */
3199         if (do_callback && i->f->dev_loss_tmo_callbk)
3200                 i->f->dev_loss_tmo_callbk(rport);
3201 }
3202
3203
3204 /**
3205  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3206  * @work:       rport to terminate io on.
3207  *
3208  * Notes: Only requests the failure of the io, not that all are flushed
3209  *    prior to returning.
3210  */
3211 static void
3212 fc_timeout_fail_rport_io(struct work_struct *work)
3213 {
3214         struct fc_rport *rport =
3215                 container_of(work, struct fc_rport, fail_io_work.work);
3216
3217         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3218                 return;
3219
3220         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3221         fc_terminate_rport_io(rport);
3222 }
3223
3224 /**
3225  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3226  * @work:       remote port to be scanned.
3227  */
3228 static void
3229 fc_scsi_scan_rport(struct work_struct *work)
3230 {
3231         struct fc_rport *rport =
3232                 container_of(work, struct fc_rport, scan_work);
3233         struct Scsi_Host *shost = rport_to_shost(rport);
3234         struct fc_internal *i = to_fc_internal(shost->transportt);
3235         unsigned long flags;
3236
3237         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3238             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3239             !(i->f->disable_target_scan)) {
3240                 scsi_scan_target(&rport->dev, rport->channel,
3241                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3242         }
3243
3244         spin_lock_irqsave(shost->host_lock, flags);
3245         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3246         spin_unlock_irqrestore(shost->host_lock, flags);
3247 }
3248
3249 /**
3250  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3251  * @cmnd: SCSI command that scsi_eh is trying to recover
3252  *
3253  * This routine can be called from a FC LLD scsi_eh callback. It
3254  * blocks the scsi_eh thread until the fc_rport leaves the
3255  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3256  * necessary to avoid the scsi_eh failing recovery actions for blocked
3257  * rports which would lead to offlined SCSI devices.
3258  *
3259  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3260  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3261  *          passed back to scsi_eh.
3262  */
3263 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3264 {
3265         struct Scsi_Host *shost = cmnd->device->host;
3266         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3267         unsigned long flags;
3268
3269         spin_lock_irqsave(shost->host_lock, flags);
3270         while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3271                !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3272                 spin_unlock_irqrestore(shost->host_lock, flags);
3273                 msleep(1000);
3274                 spin_lock_irqsave(shost->host_lock, flags);
3275         }
3276         spin_unlock_irqrestore(shost->host_lock, flags);
3277
3278         if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3279                 return FAST_IO_FAIL;
3280
3281         return 0;
3282 }
3283 EXPORT_SYMBOL(fc_block_scsi_eh);
3284
3285 /**
3286  * fc_vport_setup - allocates and creates a FC virtual port.
3287  * @shost:      scsi host the virtual port is connected to.
3288  * @channel:    Channel on shost port connected to.
3289  * @pdev:       parent device for vport
3290  * @ids:        The world wide names, FC4 port roles, etc for
3291  *              the virtual port.
3292  * @ret_vport:  The pointer to the created vport.
3293  *
3294  * Allocates and creates the vport structure, calls the parent host
3295  * to instantiate the vport, the completes w/ class and sysfs creation.
3296  *
3297  * Notes:
3298  *      This routine assumes no locks are held on entry.
3299  */
3300 static int
3301 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3302         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3303 {
3304         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3305         struct fc_internal *fci = to_fc_internal(shost->transportt);
3306         struct fc_vport *vport;
3307         struct device *dev;
3308         unsigned long flags;
3309         size_t size;
3310         int error;
3311
3312         *ret_vport = NULL;
3313
3314         if ( ! fci->f->vport_create)
3315                 return -ENOENT;
3316
3317         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3318         vport = kzalloc(size, GFP_KERNEL);
3319         if (unlikely(!vport)) {
3320                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3321                 return -ENOMEM;
3322         }
3323
3324         vport->vport_state = FC_VPORT_UNKNOWN;
3325         vport->vport_last_state = FC_VPORT_UNKNOWN;
3326         vport->node_name = ids->node_name;
3327         vport->port_name = ids->port_name;
3328         vport->roles = ids->roles;
3329         vport->vport_type = ids->vport_type;
3330         if (fci->f->dd_fcvport_size)
3331                 vport->dd_data = &vport[1];
3332         vport->shost = shost;
3333         vport->channel = channel;
3334         vport->flags = FC_VPORT_CREATING;
3335         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3336
3337         spin_lock_irqsave(shost->host_lock, flags);
3338
3339         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3340                 spin_unlock_irqrestore(shost->host_lock, flags);
3341                 kfree(vport);
3342                 return -ENOSPC;
3343         }
3344         fc_host->npiv_vports_inuse++;
3345         vport->number = fc_host->next_vport_number++;
3346         list_add_tail(&vport->peers, &fc_host->vports);
3347         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3348
3349         spin_unlock_irqrestore(shost->host_lock, flags);
3350
3351         dev = &vport->dev;
3352         device_initialize(dev);                 /* takes self reference */
3353         dev->parent = get_device(pdev);         /* takes parent reference */
3354         dev->release = fc_vport_dev_release;
3355         dev_set_name(dev, "vport-%d:%d-%d",
3356                      shost->host_no, channel, vport->number);
3357         transport_setup_device(dev);
3358
3359         error = device_add(dev);
3360         if (error) {
3361                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3362                 goto delete_vport;
3363         }
3364         transport_add_device(dev);
3365         transport_configure_device(dev);
3366
3367         error = fci->f->vport_create(vport, ids->disable);
3368         if (error) {
3369                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3370                 goto delete_vport_all;
3371         }
3372
3373         /*
3374          * if the parent isn't the physical adapter's Scsi_Host, ensure
3375          * the Scsi_Host at least contains ia symlink to the vport.
3376          */
3377         if (pdev != &shost->shost_gendev) {
3378                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3379                                  &dev->kobj, dev_name(dev));
3380                 if (error)
3381                         printk(KERN_ERR
3382                                 "%s: Cannot create vport symlinks for "
3383                                 "%s, err=%d\n",
3384                                 __func__, dev_name(dev), error);
3385         }
3386         spin_lock_irqsave(shost->host_lock, flags);
3387         vport->flags &= ~FC_VPORT_CREATING;
3388         spin_unlock_irqrestore(shost->host_lock, flags);
3389
3390         dev_printk(KERN_NOTICE, pdev,
3391                         "%s created via shost%d channel %d\n", dev_name(dev),
3392                         shost->host_no, channel);
3393
3394         *ret_vport = vport;
3395
3396         return 0;
3397
3398 delete_vport_all:
3399         transport_remove_device(dev);
3400         device_del(dev);
3401 delete_vport:
3402         transport_destroy_device(dev);
3403         spin_lock_irqsave(shost->host_lock, flags);
3404         list_del(&vport->peers);
3405         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3406         fc_host->npiv_vports_inuse--;
3407         spin_unlock_irqrestore(shost->host_lock, flags);
3408         put_device(dev->parent);
3409         kfree(vport);
3410
3411         return error;
3412 }
3413
3414 /**
3415  * fc_vport_create - Admin App or LLDD requests creation of a vport
3416  * @shost:      scsi host the virtual port is connected to.
3417  * @channel:    channel on shost port connected to.
3418  * @ids:        The world wide names, FC4 port roles, etc for
3419  *              the virtual port.
3420  *
3421  * Notes:
3422  *      This routine assumes no locks are held on entry.
3423  */
3424 struct fc_vport *
3425 fc_vport_create(struct Scsi_Host *shost, int channel,
3426         struct fc_vport_identifiers *ids)
3427 {
3428         int stat;
3429         struct fc_vport *vport;
3430
3431         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3432                  ids, &vport);
3433         return stat ? NULL : vport;
3434 }
3435 EXPORT_SYMBOL(fc_vport_create);
3436
3437 /**
3438  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3439  * @vport:      fc_vport to be terminated
3440  *
3441  * Calls the LLDD vport_delete() function, then deallocates and removes
3442  * the vport from the shost and object tree.
3443  *
3444  * Notes:
3445  *      This routine assumes no locks are held on entry.
3446  */
3447 int
3448 fc_vport_terminate(struct fc_vport *vport)
3449 {
3450         struct Scsi_Host *shost = vport_to_shost(vport);
3451         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3452         struct fc_internal *i = to_fc_internal(shost->transportt);
3453         struct device *dev = &vport->dev;
3454         unsigned long flags;
3455         int stat;
3456
3457         if (i->f->vport_delete)
3458                 stat = i->f->vport_delete(vport);
3459         else
3460                 stat = -ENOENT;
3461
3462         spin_lock_irqsave(shost->host_lock, flags);
3463         vport->flags &= ~FC_VPORT_DELETING;
3464         if (!stat) {
3465                 vport->flags |= FC_VPORT_DELETED;
3466                 list_del(&vport->peers);
3467                 fc_host->npiv_vports_inuse--;
3468                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3469         }
3470         spin_unlock_irqrestore(shost->host_lock, flags);
3471
3472         if (stat)
3473                 return stat;
3474
3475         if (dev->parent != &shost->shost_gendev)
3476                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3477         transport_remove_device(dev);
3478         device_del(dev);
3479         transport_destroy_device(dev);
3480
3481         /*
3482          * Removing our self-reference should mean our
3483          * release function gets called, which will drop the remaining
3484          * parent reference and free the data structure.
3485          */
3486         put_device(dev);                        /* for self-reference */
3487
3488         return 0; /* SUCCESS */
3489 }
3490 EXPORT_SYMBOL(fc_vport_terminate);
3491
3492 /**
3493  * fc_vport_sched_delete - workq-based delete request for a vport
3494  * @work:       vport to be deleted.
3495  */
3496 static void
3497 fc_vport_sched_delete(struct work_struct *work)
3498 {
3499         struct fc_vport *vport =
3500                 container_of(work, struct fc_vport, vport_delete_work);
3501         int stat;
3502
3503         stat = fc_vport_terminate(vport);
3504         if (stat)
3505                 dev_printk(KERN_ERR, vport->dev.parent,
3506                         "%s: %s could not be deleted created via "
3507                         "shost%d channel %d - error %d\n", __func__,
3508                         dev_name(&vport->dev), vport->shost->host_no,
3509                         vport->channel, stat);
3510 }
3511
3512
3513 /*
3514  * BSG support
3515  */
3516
3517
3518 /**
3519  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3520  * @job:        fc_bsg_job that is to be torn down
3521  */
3522 static void
3523 fc_destroy_bsgjob(struct fc_bsg_job *job)
3524 {
3525         unsigned long flags;
3526
3527         spin_lock_irqsave(&job->job_lock, flags);
3528         if (job->ref_cnt) {
3529                 spin_unlock_irqrestore(&job->job_lock, flags);
3530                 return;
3531         }
3532         spin_unlock_irqrestore(&job->job_lock, flags);
3533
3534         put_device(job->dev);   /* release reference for the request */
3535
3536         kfree(job->request_payload.sg_list);
3537         kfree(job->reply_payload.sg_list);
3538         kfree(job);
3539 }
3540
3541 /**
3542  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3543  *                  completed
3544  * @job:        fc_bsg_job that is complete
3545  */
3546 static void
3547 fc_bsg_jobdone(struct fc_bsg_job *job)
3548 {
3549         struct request *req = job->req;
3550         struct request *rsp = req->next_rq;
3551         int err;
3552
3553         err = job->req->errors = job->reply->result;
3554
3555         if (err < 0)
3556                 /* we're only returning the result field in the reply */
3557                 job->req->sense_len = sizeof(uint32_t);
3558         else
3559                 job->req->sense_len = job->reply_len;
3560
3561         /* we assume all request payload was transferred, residual == 0 */
3562         req->resid_len = 0;
3563
3564         if (rsp) {
3565                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3566
3567                 /* set reply (bidi) residual */
3568                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3569                                       rsp->resid_len);
3570         }
3571         blk_complete_request(req);
3572 }
3573
3574 /**
3575  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3576  * @rq:        BSG request that holds the job to be destroyed
3577  */
3578 static void fc_bsg_softirq_done(struct request *rq)
3579 {
3580         struct fc_bsg_job *job = rq->special;
3581         unsigned long flags;
3582
3583         spin_lock_irqsave(&job->job_lock, flags);
3584         job->state_flags |= FC_RQST_STATE_DONE;
3585         job->ref_cnt--;
3586         spin_unlock_irqrestore(&job->job_lock, flags);
3587
3588         blk_end_request_all(rq, rq->errors);
3589         fc_destroy_bsgjob(job);
3590 }
3591
3592 /**
3593  * fc_bsg_job_timeout - handler for when a bsg request timesout
3594  * @req:        request that timed out
3595  */
3596 static enum blk_eh_timer_return
3597 fc_bsg_job_timeout(struct request *req)
3598 {
3599         struct fc_bsg_job *job = (void *) req->special;
3600         struct Scsi_Host *shost = job->shost;
3601         struct fc_internal *i = to_fc_internal(shost->transportt);
3602         unsigned long flags;
3603         int err = 0, done = 0;
3604
3605         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3606                 return BLK_EH_RESET_TIMER;
3607
3608         spin_lock_irqsave(&job->job_lock, flags);
3609         if (job->state_flags & FC_RQST_STATE_DONE)
3610                 done = 1;
3611         else
3612                 job->ref_cnt++;
3613         spin_unlock_irqrestore(&job->job_lock, flags);
3614
3615         if (!done && i->f->bsg_timeout) {
3616                 /* call LLDD to abort the i/o as it has timed out */
3617                 err = i->f->bsg_timeout(job);
3618                 if (err == -EAGAIN) {
3619                         job->ref_cnt--;
3620                         return BLK_EH_RESET_TIMER;
3621                 } else if (err)
3622                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3623                                 "abort failed with status %d\n", err);
3624         }
3625
3626         /* the blk_end_sync_io() doesn't check the error */
3627         if (done)
3628                 return BLK_EH_NOT_HANDLED;
3629         else
3630                 return BLK_EH_HANDLED;
3631 }
3632
3633 static int
3634 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3635 {
3636         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3637
3638         BUG_ON(!req->nr_phys_segments);
3639
3640         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3641         if (!buf->sg_list)
3642                 return -ENOMEM;
3643         sg_init_table(buf->sg_list, req->nr_phys_segments);
3644         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3645         buf->payload_len = blk_rq_bytes(req);
3646         return 0;
3647 }
3648
3649
3650 /**
3651  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3652  *                   bsg request
3653  * @shost:      SCSI Host corresponding to the bsg object
3654  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3655  * @req:        BSG request that needs a job structure
3656  */
3657 static int
3658 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3659         struct request *req)
3660 {
3661         struct fc_internal *i = to_fc_internal(shost->transportt);
3662         struct request *rsp = req->next_rq;
3663         struct fc_bsg_job *job;
3664         int ret;
3665
3666         BUG_ON(req->special);
3667
3668         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3669                         GFP_KERNEL);
3670         if (!job)
3671                 return -ENOMEM;
3672
3673         /*
3674          * Note: this is a bit silly.
3675          * The request gets formatted as a SGIO v4 ioctl request, which
3676          * then gets reformatted as a blk request, which then gets
3677          * reformatted as a fc bsg request. And on completion, we have
3678          * to wrap return results such that SGIO v4 thinks it was a scsi
3679          * status.  I hope this was all worth it.
3680          */
3681
3682         req->special = job;
3683         job->shost = shost;
3684         job->rport = rport;
3685         job->req = req;
3686         if (i->f->dd_bsg_size)
3687                 job->dd_data = (void *)&job[1];
3688         spin_lock_init(&job->job_lock);
3689         job->request = (struct fc_bsg_request *)req->cmd;
3690         job->request_len = req->cmd_len;
3691         job->reply = req->sense;
3692         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3693                                                  * allocated */
3694         if (req->bio) {
3695                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3696                 if (ret)
3697                         goto failjob_rls_job;
3698         }
3699         if (rsp && rsp->bio) {
3700                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3701                 if (ret)
3702                         goto failjob_rls_rqst_payload;
3703         }
3704         job->job_done = fc_bsg_jobdone;
3705         if (rport)
3706                 job->dev = &rport->dev;
3707         else
3708                 job->dev = &shost->shost_gendev;
3709         get_device(job->dev);           /* take a reference for the request */
3710
3711         job->ref_cnt = 1;
3712
3713         return 0;
3714
3715
3716 failjob_rls_rqst_payload:
3717         kfree(job->request_payload.sg_list);
3718 failjob_rls_job:
3719         kfree(job);
3720         return -ENOMEM;
3721 }
3722
3723
3724 enum fc_dispatch_result {
3725         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3726         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3727         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3728 };
3729
3730
3731 /**
3732  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3733  * @q:          fc host request queue
3734  * @shost:      scsi host rport attached to
3735  * @job:        bsg job to be processed
3736  */
3737 static enum fc_dispatch_result
3738 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3739                          struct fc_bsg_job *job)
3740 {
3741         struct fc_internal *i = to_fc_internal(shost->transportt);
3742         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3743         int ret;
3744
3745         /* Validate the host command */
3746         switch (job->request->msgcode) {
3747         case FC_BSG_HST_ADD_RPORT:
3748                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3749                 break;
3750
3751         case FC_BSG_HST_DEL_RPORT:
3752                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3753                 break;
3754
3755         case FC_BSG_HST_ELS_NOLOGIN:
3756                 cmdlen += sizeof(struct fc_bsg_host_els);
3757                 /* there better be a xmt and rcv payloads */
3758                 if ((!job->request_payload.payload_len) ||
3759                     (!job->reply_payload.payload_len)) {
3760                         ret = -EINVAL;
3761                         goto fail_host_msg;
3762                 }
3763                 break;
3764
3765         case FC_BSG_HST_CT:
3766                 cmdlen += sizeof(struct fc_bsg_host_ct);
3767                 /* there better be xmt and rcv payloads */
3768                 if ((!job->request_payload.payload_len) ||
3769                     (!job->reply_payload.payload_len)) {
3770                         ret = -EINVAL;
3771                         goto fail_host_msg;
3772                 }
3773                 break;
3774
3775         case FC_BSG_HST_VENDOR:
3776                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3777                 if ((shost->hostt->vendor_id == 0L) ||
3778                     (job->request->rqst_data.h_vendor.vendor_id !=
3779                         shost->hostt->vendor_id)) {
3780                         ret = -ESRCH;
3781                         goto fail_host_msg;
3782                 }
3783                 break;
3784
3785         default:
3786                 ret = -EBADR;
3787                 goto fail_host_msg;
3788         }
3789
3790         /* check if we really have all the request data needed */
3791         if (job->request_len < cmdlen) {
3792                 ret = -ENOMSG;
3793                 goto fail_host_msg;
3794         }
3795
3796         ret = i->f->bsg_request(job);
3797         if (!ret)
3798                 return FC_DISPATCH_UNLOCKED;
3799
3800 fail_host_msg:
3801         /* return the errno failure code as the only status */
3802         BUG_ON(job->reply_len < sizeof(uint32_t));
3803         job->reply->reply_payload_rcv_len = 0;
3804         job->reply->result = ret;
3805         job->reply_len = sizeof(uint32_t);
3806         fc_bsg_jobdone(job);
3807         return FC_DISPATCH_UNLOCKED;
3808 }
3809
3810
3811 /*
3812  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3813  * @rport:      rport to be restarted
3814  */
3815 static void
3816 fc_bsg_goose_queue(struct fc_rport *rport)
3817 {
3818         if (!rport->rqst_q)
3819                 return;
3820
3821         /*
3822          * This get/put dance makes no sense
3823          */
3824         get_device(&rport->dev);
3825         blk_run_queue_async(rport->rqst_q);
3826         put_device(&rport->dev);
3827 }
3828
3829 /**
3830  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3831  * @q:          rport request queue
3832  * @shost:      scsi host rport attached to
3833  * @rport:      rport request destined to
3834  * @job:        bsg job to be processed
3835  */
3836 static enum fc_dispatch_result
3837 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3838                          struct fc_rport *rport, struct fc_bsg_job *job)
3839 {
3840         struct fc_internal *i = to_fc_internal(shost->transportt);
3841         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3842         int ret;
3843
3844         /* Validate the rport command */
3845         switch (job->request->msgcode) {
3846         case FC_BSG_RPT_ELS:
3847                 cmdlen += sizeof(struct fc_bsg_rport_els);
3848                 goto check_bidi;
3849
3850         case FC_BSG_RPT_CT:
3851                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3852 check_bidi:
3853                 /* there better be xmt and rcv payloads */
3854                 if ((!job->request_payload.payload_len) ||
3855                     (!job->reply_payload.payload_len)) {
3856                         ret = -EINVAL;
3857                         goto fail_rport_msg;
3858                 }
3859                 break;
3860         default:
3861                 ret = -EBADR;
3862                 goto fail_rport_msg;
3863         }
3864
3865         /* check if we really have all the request data needed */
3866         if (job->request_len < cmdlen) {
3867                 ret = -ENOMSG;
3868                 goto fail_rport_msg;
3869         }
3870
3871         ret = i->f->bsg_request(job);
3872         if (!ret)
3873                 return FC_DISPATCH_UNLOCKED;
3874
3875 fail_rport_msg:
3876         /* return the errno failure code as the only status */
3877         BUG_ON(job->reply_len < sizeof(uint32_t));
3878         job->reply->reply_payload_rcv_len = 0;
3879         job->reply->result = ret;
3880         job->reply_len = sizeof(uint32_t);
3881         fc_bsg_jobdone(job);
3882         return FC_DISPATCH_UNLOCKED;
3883 }
3884
3885
3886 /**
3887  * fc_bsg_request_handler - generic handler for bsg requests
3888  * @q:          request queue to manage
3889  * @shost:      Scsi_Host related to the bsg object
3890  * @rport:      FC remote port related to the bsg object (optional)
3891  * @dev:        device structure for bsg object
3892  */
3893 static void
3894 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3895                        struct fc_rport *rport, struct device *dev)
3896 {
3897         struct request *req;
3898         struct fc_bsg_job *job;
3899         enum fc_dispatch_result ret;
3900
3901         if (!get_device(dev))
3902                 return;
3903
3904         while (1) {
3905                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3906                     !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3907                         break;
3908
3909                 req = blk_fetch_request(q);
3910                 if (!req)
3911                         break;
3912
3913                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3914                         req->errors = -ENXIO;
3915                         spin_unlock_irq(q->queue_lock);
3916                         blk_end_request_all(req, -ENXIO);
3917                         spin_lock_irq(q->queue_lock);
3918                         continue;
3919                 }
3920
3921                 spin_unlock_irq(q->queue_lock);
3922
3923                 ret = fc_req_to_bsgjob(shost, rport, req);
3924                 if (ret) {
3925                         req->errors = ret;
3926                         blk_end_request_all(req, ret);
3927                         spin_lock_irq(q->queue_lock);
3928                         continue;
3929                 }
3930
3931                 job = req->special;
3932
3933                 /* check if we have the msgcode value at least */
3934                 if (job->request_len < sizeof(uint32_t)) {
3935                         BUG_ON(job->reply_len < sizeof(uint32_t));
3936                         job->reply->reply_payload_rcv_len = 0;
3937                         job->reply->result = -ENOMSG;
3938                         job->reply_len = sizeof(uint32_t);
3939                         fc_bsg_jobdone(job);
3940                         spin_lock_irq(q->queue_lock);
3941                         continue;
3942                 }
3943
3944                 /* the dispatch routines will unlock the queue_lock */
3945                 if (rport)
3946                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3947                 else
3948                         ret = fc_bsg_host_dispatch(q, shost, job);
3949
3950                 /* did dispatcher hit state that can't process any more */
3951                 if (ret == FC_DISPATCH_BREAK)
3952                         break;
3953
3954                 /* did dispatcher had released the lock */
3955                 if (ret == FC_DISPATCH_UNLOCKED)
3956                         spin_lock_irq(q->queue_lock);
3957         }
3958
3959         spin_unlock_irq(q->queue_lock);
3960         put_device(dev);
3961         spin_lock_irq(q->queue_lock);
3962 }
3963
3964
3965 /**
3966  * fc_bsg_host_handler - handler for bsg requests for a fc host
3967  * @q:          fc host request queue
3968  */
3969 static void
3970 fc_bsg_host_handler(struct request_queue *q)
3971 {
3972         struct Scsi_Host *shost = q->queuedata;
3973
3974         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
3975 }
3976
3977
3978 /**
3979  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
3980  * @q:          rport request queue
3981  */
3982 static void
3983 fc_bsg_rport_handler(struct request_queue *q)
3984 {
3985         struct fc_rport *rport = q->queuedata;
3986         struct Scsi_Host *shost = rport_to_shost(rport);
3987
3988         fc_bsg_request_handler(q, shost, rport, &rport->dev);
3989 }
3990
3991
3992 /**
3993  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3994  * @shost:      shost for fc_host
3995  * @fc_host:    fc_host adding the structures to
3996  */
3997 static int
3998 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3999 {
4000         struct device *dev = &shost->shost_gendev;
4001         struct fc_internal *i = to_fc_internal(shost->transportt);
4002         struct request_queue *q;
4003         int err;
4004         char bsg_name[20];
4005
4006         fc_host->rqst_q = NULL;
4007
4008         if (!i->f->bsg_request)
4009                 return -ENOTSUPP;
4010
4011         snprintf(bsg_name, sizeof(bsg_name),
4012                  "fc_host%d", shost->host_no);
4013
4014         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4015         if (!q) {
4016                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4017                                 "initialize - no request queue\n",
4018                                  shost->host_no);
4019                 return -ENOMEM;
4020         }
4021
4022         q->queuedata = shost;
4023         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4024         blk_queue_softirq_done(q, fc_bsg_softirq_done);
4025         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4026         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4027
4028         err = bsg_register_queue(q, dev, bsg_name, NULL);
4029         if (err) {
4030                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4031                                 "initialize - register queue\n",
4032                                 shost->host_no);
4033                 blk_cleanup_queue(q);
4034                 return err;
4035         }
4036
4037         fc_host->rqst_q = q;
4038         return 0;
4039 }
4040
4041
4042 /**
4043  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4044  * @shost:      shost that rport is attached to
4045  * @rport:      rport that the bsg hooks are being attached to
4046  */
4047 static int
4048 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4049 {
4050         struct device *dev = &rport->dev;
4051         struct fc_internal *i = to_fc_internal(shost->transportt);
4052         struct request_queue *q;
4053         int err;
4054
4055         rport->rqst_q = NULL;
4056
4057         if (!i->f->bsg_request)
4058                 return -ENOTSUPP;
4059
4060         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4061         if (!q) {
4062                 printk(KERN_ERR "%s: bsg interface failed to "
4063                                 "initialize - no request queue\n",
4064                                  dev->kobj.name);
4065                 return -ENOMEM;
4066         }
4067
4068         q->queuedata = rport;
4069         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4070         blk_queue_softirq_done(q, fc_bsg_softirq_done);
4071         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4072         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4073
4074         err = bsg_register_queue(q, dev, NULL, NULL);
4075         if (err) {
4076                 printk(KERN_ERR "%s: bsg interface failed to "
4077                                 "initialize - register queue\n",
4078                                  dev->kobj.name);
4079                 blk_cleanup_queue(q);
4080                 return err;
4081         }
4082
4083         rport->rqst_q = q;
4084         return 0;
4085 }
4086
4087
4088 /**
4089  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4090  * @q:  the request_queue that is to be torn down.
4091  *
4092  * Notes:
4093  *   Before unregistering the queue empty any requests that are blocked
4094  *
4095  *
4096  */
4097 static void
4098 fc_bsg_remove(struct request_queue *q)
4099 {
4100         struct request *req; /* block request */
4101         int counts; /* totals for request_list count and starved */
4102
4103         if (q) {
4104                 /* Stop taking in new requests */
4105                 spin_lock_irq(q->queue_lock);
4106                 blk_stop_queue(q);
4107
4108                 /* drain all requests in the queue */
4109                 while (1) {
4110                         /* need the lock to fetch a request
4111                          * this may fetch the same reqeust as the previous pass
4112                          */
4113                         req = blk_fetch_request(q);
4114                         /* save requests in use and starved */
4115                         counts = q->rq.count[0] + q->rq.count[1] +
4116                                 q->rq.starved[0] + q->rq.starved[1];
4117                         spin_unlock_irq(q->queue_lock);
4118                         /* any requests still outstanding? */
4119                         if (counts == 0)
4120                                 break;
4121
4122                         /* This may be the same req as the previous iteration,
4123                          * always send the blk_end_request_all after a prefetch.
4124                          * It is not okay to not end the request because the
4125                          * prefetch started the request.
4126                          */
4127                         if (req) {
4128                                 /* return -ENXIO to indicate that this queue is
4129                                  * going away
4130                                  */
4131                                 req->errors = -ENXIO;
4132                                 blk_end_request_all(req, -ENXIO);
4133                         }
4134
4135                         msleep(200); /* allow bsg to possibly finish */
4136                         spin_lock_irq(q->queue_lock);
4137                 }
4138
4139                 bsg_unregister_queue(q);
4140                 blk_cleanup_queue(q);
4141         }
4142 }
4143
4144
4145 /* Original Author:  Martin Hicks */
4146 MODULE_AUTHOR("James Smart");
4147 MODULE_DESCRIPTION("FC Transport Attributes");
4148 MODULE_LICENSE("GPL");
4149
4150 module_init(fc_transport_init);
4151 module_exit(fc_transport_exit);