2cab556b6e82afa886203254b16024783e47f8c5
[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) 2004-2005   James Smart, Emulex Corporation
23  *    Rewrite for host, target, device, and remote port attributes,
24  *    statistics, and service functions...
25  *
26  */
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_host.h>
31 #include <scsi/scsi_transport.h>
32 #include <scsi/scsi_transport_fc.h>
33 #include "scsi_priv.h"
34
35 #define FC_PRINTK(x, l, f, a...)        printk(l "scsi(%d:%d:%d:%d): " f, (x)->host->host_no, (x)->channel, (x)->id, (x)->lun , ##a)
36
37 /*
38  * Redefine so that we can have same named attributes in the
39  * sdev/starget/host objects.
40  */
41 #define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
42 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
43         __ATTR(_name,_mode,_show,_store)
44
45 #define fc_enum_name_search(title, table_type, table)                   \
46 static const char *get_fc_##title##_name(enum table_type table_key)     \
47 {                                                                       \
48         int i;                                                          \
49         char *name = NULL;                                              \
50                                                                         \
51         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
52                 if (table[i].value == table_key) {                      \
53                         name = table[i].name;                           \
54                         break;                                          \
55                 }                                                       \
56         }                                                               \
57         return name;                                                    \
58 }
59
60 #define fc_enum_name_match(title, table_type, table)                    \
61 static int get_fc_##title##_match(const char *table_key,                \
62                 enum table_type *value)                                 \
63 {                                                                       \
64         int i;                                                          \
65                                                                         \
66         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {          \
67                 if (strncmp(table_key, table[i].name,                   \
68                                 table[i].matchlen) == 0) {              \
69                         *value = table[i].value;                        \
70                         return 0; /* success */                         \
71                 }                                                       \
72         }                                                               \
73         return 1; /* failure */                                         \
74 }
75
76
77 /* Convert fc_port_type values to ascii string name */
78 static struct {
79         enum fc_port_type       value;
80         char                    *name;
81 } fc_port_type_names[] = {
82         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
83         { FC_PORTTYPE_OTHER,            "Other" },
84         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
85         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
86         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
87         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
88         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection" },
89 };
90 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
91 #define FC_PORTTYPE_MAX_NAMELEN         50
92
93
94 /* Convert fc_port_state values to ascii string name */
95 static struct {
96         enum fc_port_state      value;
97         char                    *name;
98 } fc_port_state_names[] = {
99         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
100         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
101         { FC_PORTSTATE_ONLINE,          "Online" },
102         { FC_PORTSTATE_OFFLINE,         "Offline" },
103         { FC_PORTSTATE_BLOCKED,         "Blocked" },
104         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
105         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
106         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
107         { FC_PORTSTATE_ERROR,           "Error" },
108         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
109 };
110 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
111 #define FC_PORTSTATE_MAX_NAMELEN        20
112
113
114 /* Convert fc_tgtid_binding_type values to ascii string name */
115 static struct {
116         enum fc_tgtid_binding_type      value;
117         char                            *name;
118         int                             matchlen;
119 } fc_tgtid_binding_type_names[] = {
120         { FC_TGTID_BIND_NONE, "none", 4 },
121         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
122         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
123         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
124 };
125 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
126                 fc_tgtid_binding_type_names)
127 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
128                 fc_tgtid_binding_type_names)
129 #define FC_BINDTYPE_MAX_NAMELEN 30
130
131
132 #define fc_bitfield_name_search(title, table)                   \
133 static ssize_t                                                  \
134 get_fc_##title##_names(u32 table_key, char *buf)                \
135 {                                                               \
136         char *prefix = "";                                      \
137         ssize_t len = 0;                                        \
138         int i;                                                  \
139                                                                 \
140         for (i = 0; i < sizeof(table)/sizeof(table[0]); i++) {  \
141                 if (table[i].value & table_key) {               \
142                         len += sprintf(buf + len, "%s%s",       \
143                                 prefix, table[i].name);         \
144                         prefix = ", ";                          \
145                 }                                               \
146         }                                                       \
147         len += sprintf(buf + len, "\n");                        \
148         return len;                                             \
149 }
150
151
152 /* Convert FC_COS bit values to ascii string name */
153 static struct {
154         u32                     value;
155         char                    *name;
156 } fc_cos_names[] = {
157         { FC_COS_CLASS1,        "Class 1" },
158         { FC_COS_CLASS2,        "Class 2" },
159         { FC_COS_CLASS3,        "Class 3" },
160         { FC_COS_CLASS4,        "Class 4" },
161         { FC_COS_CLASS6,        "Class 6" },
162 };
163 fc_bitfield_name_search(cos, fc_cos_names)
164
165
166 /* Convert FC_PORTSPEED bit values to ascii string name */
167 static struct {
168         u32                     value;
169         char                    *name;
170 } fc_port_speed_names[] = {
171         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
172         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
173         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
174         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
175         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
176 };
177 fc_bitfield_name_search(port_speed, fc_port_speed_names)
178
179
180 static int
181 show_fc_fc4s (char *buf, u8 *fc4_list)
182 {
183         int i, len=0;
184
185         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
186                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
187         len += sprintf(buf + len, "\n");
188         return len;
189 }
190
191
192 /* Convert FC_RPORT_ROLE bit values to ascii string name */
193 static struct {
194         u32                     value;
195         char                    *name;
196 } fc_remote_port_role_names[] = {
197         { FC_RPORT_ROLE_FCP_TARGET,     "FCP Target" },
198         { FC_RPORT_ROLE_FCP_INITIATOR,  "FCP Initiator" },
199         { FC_RPORT_ROLE_IP_PORT,        "IP Port" },
200 };
201 fc_bitfield_name_search(remote_port_roles, fc_remote_port_role_names)
202
203 /*
204  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
205  */
206 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
207 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
208 #define FC_FPORT_PORTID                 0x00000e
209 #define FC_FABCTLR_PORTID               0x00000d
210 #define FC_DIRSRVR_PORTID               0x00000c
211 #define FC_TIMESRVR_PORTID              0x00000b
212 #define FC_MGMTSRVR_PORTID              0x00000a
213
214
215 static void fc_timeout_blocked_rport(void *data);
216 static void fc_scsi_scan_rport(void *data);
217 static void fc_rport_terminate(struct fc_rport  *rport);
218
219 /*
220  * Attribute counts pre object type...
221  * Increase these values if you add attributes
222  */
223 #define FC_STARGET_NUM_ATTRS    3
224 #define FC_RPORT_NUM_ATTRS      9
225 #define FC_HOST_NUM_ATTRS       15
226
227 struct fc_internal {
228         struct scsi_transport_template t;
229         struct fc_function_template *f;
230
231         /*
232          * For attributes : each object has :
233          *   An array of the actual attributes structures
234          *   An array of null-terminated pointers to the attribute
235          *     structures - used for mid-layer interaction.
236          *
237          * The attribute containers for the starget and host are are
238          * part of the midlayer. As the remote port is specific to the
239          * fc transport, we must provide the attribute container.
240          */
241         struct class_device_attribute private_starget_attrs[
242                                                         FC_STARGET_NUM_ATTRS];
243         struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
244
245         struct class_device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
246         struct class_device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
247
248         struct transport_container rport_attr_cont;
249         struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
250         struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
251 };
252
253 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
254
255 static int fc_target_setup(struct transport_container *tc, struct device *dev,
256                            struct class_device *cdev)
257 {
258         struct scsi_target *starget = to_scsi_target(dev);
259         struct fc_rport *rport = starget_to_rport(starget);
260
261         /*
262          * if parent is remote port, use values from remote port.
263          * Otherwise, this host uses the fc_transport, but not the
264          * remote port interface. As such, initialize to known non-values.
265          */
266         if (rport) {
267                 fc_starget_node_name(starget) = rport->node_name;
268                 fc_starget_port_name(starget) = rport->port_name;
269                 fc_starget_port_id(starget) = rport->port_id;
270         } else {
271                 fc_starget_node_name(starget) = -1;
272                 fc_starget_port_name(starget) = -1;
273                 fc_starget_port_id(starget) = -1;
274         }
275
276         return 0;
277 }
278
279 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
280                                "fc_transport",
281                                fc_target_setup,
282                                NULL,
283                                NULL);
284
285 static int fc_host_setup(struct transport_container *tc, struct device *dev,
286                          struct class_device *cdev)
287 {
288         struct Scsi_Host *shost = dev_to_shost(dev);
289
290         /* 
291          * Set default values easily detected by the midlayer as
292          * failure cases.  The scsi lldd is responsible for initializing
293          * all transport attributes to valid values per host.
294          */
295         fc_host_node_name(shost) = -1;
296         fc_host_port_name(shost) = -1;
297         fc_host_supported_classes(shost) = FC_COS_UNSPECIFIED;
298         memset(fc_host_supported_fc4s(shost), 0,
299                 sizeof(fc_host_supported_fc4s(shost)));
300         memset(fc_host_symbolic_name(shost), 0,
301                 sizeof(fc_host_symbolic_name(shost)));
302         fc_host_supported_speeds(shost) = FC_PORTSPEED_UNKNOWN;
303         fc_host_maxframe_size(shost) = -1;
304         memset(fc_host_serial_number(shost), 0,
305                 sizeof(fc_host_serial_number(shost)));
306
307         fc_host_port_id(shost) = -1;
308         fc_host_port_type(shost) = FC_PORTTYPE_UNKNOWN;
309         fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
310         memset(fc_host_active_fc4s(shost), 0,
311                 sizeof(fc_host_active_fc4s(shost)));
312         fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
313         fc_host_fabric_name(shost) = -1;
314
315         fc_host_tgtid_bind_type(shost) = FC_TGTID_BIND_BY_WWPN;
316
317         INIT_LIST_HEAD(&fc_host_rports(shost));
318         INIT_LIST_HEAD(&fc_host_rport_bindings(shost));
319         fc_host_next_rport_number(shost) = 0;
320         fc_host_next_target_id(shost) = 0;
321
322         return 0;
323 }
324
325 static DECLARE_TRANSPORT_CLASS(fc_host_class,
326                                "fc_host",
327                                fc_host_setup,
328                                NULL,
329                                NULL);
330
331 /*
332  * Setup and Remove actions for remote ports are handled
333  * in the service functions below.
334  */
335 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
336                                "fc_remote_ports",
337                                NULL,
338                                NULL,
339                                NULL);
340
341 /*
342  * Module Parameters
343  */
344
345 /*
346  * dev_loss_tmo: the default number of seconds that the FC transport
347  *   should insulate the loss of a remote port.
348  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
349  */
350 static unsigned int fc_dev_loss_tmo = SCSI_DEVICE_BLOCK_MAX_TIMEOUT;
351
352 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, S_IRUGO|S_IWUSR);
353 MODULE_PARM_DESC(dev_loss_tmo,
354                  "Maximum number of seconds that the FC transport should"
355                  " insulate the loss of a remote port. Once this value is"
356                  " exceeded, the scsi target is removed. Value should be"
357                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");
358
359
360 static __init int fc_transport_init(void)
361 {
362         int error = transport_class_register(&fc_host_class);
363         if (error)
364                 return error;
365         error = transport_class_register(&fc_rport_class);
366         if (error)
367                 return error;
368         return transport_class_register(&fc_transport_class);
369 }
370
371 static void __exit fc_transport_exit(void)
372 {
373         transport_class_unregister(&fc_transport_class);
374         transport_class_unregister(&fc_rport_class);
375         transport_class_unregister(&fc_host_class);
376 }
377
378 /*
379  * FC Remote Port Attribute Management
380  */
381
382 #define fc_rport_show_function(field, format_string, sz, cast)          \
383 static ssize_t                                                          \
384 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
385 {                                                                       \
386         struct fc_rport *rport = transport_class_to_rport(cdev);        \
387         struct Scsi_Host *shost = rport_to_shost(rport);                \
388         struct fc_internal *i = to_fc_internal(shost->transportt);      \
389         if (i->f->get_rport_##field)                                    \
390                 i->f->get_rport_##field(rport);                         \
391         return snprintf(buf, sz, format_string, cast rport->field);     \
392 }
393
394 #define fc_rport_store_function(field)                                  \
395 static ssize_t                                                          \
396 store_fc_rport_##field(struct class_device *cdev, const char *buf,      \
397                            size_t count)                                \
398 {                                                                       \
399         int val;                                                        \
400         struct fc_rport *rport = transport_class_to_rport(cdev);        \
401         struct Scsi_Host *shost = rport_to_shost(rport);                \
402         struct fc_internal *i = to_fc_internal(shost->transportt);      \
403         val = simple_strtoul(buf, NULL, 0);                             \
404         i->f->set_rport_##field(rport, val);                            \
405         return count;                                                   \
406 }
407
408 #define fc_rport_rd_attr(field, format_string, sz)                      \
409         fc_rport_show_function(field, format_string, sz, )              \
410 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
411                          show_fc_rport_##field, NULL)
412
413 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
414         fc_rport_show_function(field, format_string, sz, (cast))        \
415 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
416                           show_fc_rport_##field, NULL)
417
418 #define fc_rport_rw_attr(field, format_string, sz)                      \
419         fc_rport_show_function(field, format_string, sz, )              \
420         fc_rport_store_function(field)                                  \
421 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
422                         show_fc_rport_##field,                          \
423                         store_fc_rport_##field)
424
425
426 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
427 static ssize_t                                                          \
428 show_fc_rport_##field (struct class_device *cdev, char *buf)            \
429 {                                                                       \
430         struct fc_rport *rport = transport_class_to_rport(cdev);        \
431         return snprintf(buf, sz, format_string, cast rport->field);     \
432 }
433
434 #define fc_private_rport_rd_attr(field, format_string, sz)              \
435         fc_private_rport_show_function(field, format_string, sz, )      \
436 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
437                          show_fc_rport_##field, NULL)
438
439 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
440         fc_private_rport_show_function(field, format_string, sz, (cast)) \
441 static FC_CLASS_DEVICE_ATTR(rport, field, S_IRUGO,                      \
442                           show_fc_rport_##field, NULL)
443
444
445 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
446 static ssize_t                                                          \
447 show_fc_rport_##title (struct class_device *cdev, char *buf)            \
448 {                                                                       \
449         struct fc_rport *rport = transport_class_to_rport(cdev);        \
450         const char *name;                                               \
451         name = get_fc_##title##_name(rport->title);                     \
452         if (!name)                                                      \
453                 return -EINVAL;                                         \
454         return snprintf(buf, maxlen, "%s\n", name);                     \
455 }                                                                       \
456 static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,                      \
457                         show_fc_rport_##title, NULL)
458
459
460 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
461         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
462         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
463         i->private_rport_attrs[count].store = NULL;                     \
464         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
465         if (i->f->show_rport_##field)                                   \
466                 count++
467
468 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
469         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
470         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
471         i->private_rport_attrs[count].store = NULL;                     \
472         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
473         count++
474
475 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
476         i->private_rport_attrs[count] = class_device_attr_rport_##field; \
477         if (!i->f->set_rport_##field) {                                 \
478                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
479                 i->private_rport_attrs[count].store = NULL;             \
480         }                                                               \
481         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
482         if (i->f->show_rport_##field)                                   \
483                 count++
484
485
486 /* The FC Transport Remote Port Attributes: */
487
488 /* Fixed Remote Port Attributes */
489
490 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
491
492 static ssize_t
493 show_fc_rport_supported_classes (struct class_device *cdev, char *buf)
494 {
495         struct fc_rport *rport = transport_class_to_rport(cdev);
496         if (rport->supported_classes == FC_COS_UNSPECIFIED)
497                 return snprintf(buf, 20, "unspecified\n");
498         return get_fc_cos_names(rport->supported_classes, buf);
499 }
500 static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
501                 show_fc_rport_supported_classes, NULL);
502
503 /* Dynamic Remote Port Attributes */
504
505 fc_rport_rw_attr(dev_loss_tmo, "%d\n", 20);
506
507
508 /* Private Remote Port Attributes */
509
510 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
511 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
512 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
513
514 static ssize_t
515 show_fc_rport_roles (struct class_device *cdev, char *buf)
516 {
517         struct fc_rport *rport = transport_class_to_rport(cdev);
518
519         /* identify any roles that are port_id specific */
520         if ((rport->port_id != -1) &&
521             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
522                                         FC_WELLKNOWN_PORTID_MASK) {
523                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
524                 case FC_FPORT_PORTID:
525                         return snprintf(buf, 30, "Fabric Port\n");
526                 case FC_FABCTLR_PORTID:
527                         return snprintf(buf, 30, "Fabric Controller\n");
528                 case FC_DIRSRVR_PORTID:
529                         return snprintf(buf, 30, "Directory Server\n");
530                 case FC_TIMESRVR_PORTID:
531                         return snprintf(buf, 30, "Time Server\n");
532                 case FC_MGMTSRVR_PORTID:
533                         return snprintf(buf, 30, "Management Server\n");
534                 default:
535                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
536                 }
537         } else {
538                 if (rport->roles == FC_RPORT_ROLE_UNKNOWN)
539                         return snprintf(buf, 20, "unknown\n");
540                 return get_fc_remote_port_roles_names(rport->roles, buf);
541         }
542 }
543 static FC_CLASS_DEVICE_ATTR(rport, roles, S_IRUGO,
544                 show_fc_rport_roles, NULL);
545
546 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
547 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
548
549
550
551 /*
552  * FC SCSI Target Attribute Management
553  */
554
555 /*
556  * Note: in the target show function we recognize when the remote
557  *  port is in the heirarchy and do not allow the driver to get
558  *  involved in sysfs functions. The driver only gets involved if
559  *  it's the "old" style that doesn't use rports.
560  */
561 #define fc_starget_show_function(field, format_string, sz, cast)        \
562 static ssize_t                                                          \
563 show_fc_starget_##field (struct class_device *cdev, char *buf)          \
564 {                                                                       \
565         struct scsi_target *starget = transport_class_to_starget(cdev); \
566         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
567         struct fc_internal *i = to_fc_internal(shost->transportt);      \
568         struct fc_rport *rport = starget_to_rport(starget);             \
569         if (rport)                                                      \
570                 fc_starget_##field(starget) = rport->field;             \
571         else if (i->f->get_starget_##field)                             \
572                 i->f->get_starget_##field(starget);                     \
573         return snprintf(buf, sz, format_string,                         \
574                 cast fc_starget_##field(starget));                      \
575 }
576
577 #define fc_starget_rd_attr(field, format_string, sz)                    \
578         fc_starget_show_function(field, format_string, sz, )            \
579 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
580                          show_fc_starget_##field, NULL)
581
582 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
583         fc_starget_show_function(field, format_string, sz, (cast))      \
584 static FC_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,                    \
585                           show_fc_starget_##field, NULL)
586
587 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
588         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
589         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
590         i->private_starget_attrs[count].store = NULL;                   \
591         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
592         if (i->f->show_starget_##field)                                 \
593                 count++
594
595 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
596         i->private_starget_attrs[count] = class_device_attr_starget_##field; \
597         if (!i->f->set_starget_##field) {                               \
598                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
599                 i->private_starget_attrs[count].store = NULL;           \
600         }                                                               \
601         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
602         if (i->f->show_starget_##field)                                 \
603                 count++
604
605 /* The FC Transport SCSI Target Attributes: */
606 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
607 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
608 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
609
610
611 /*
612  * Host Attribute Management
613  */
614
615 #define fc_host_show_function(field, format_string, sz, cast)           \
616 static ssize_t                                                          \
617 show_fc_host_##field (struct class_device *cdev, char *buf)             \
618 {                                                                       \
619         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
620         struct fc_internal *i = to_fc_internal(shost->transportt);      \
621         if (i->f->get_host_##field)                                     \
622                 i->f->get_host_##field(shost);                          \
623         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
624 }
625
626 #define fc_host_store_function(field)                                   \
627 static ssize_t                                                          \
628 store_fc_host_##field(struct class_device *cdev, const char *buf,       \
629                            size_t count)                                \
630 {                                                                       \
631         int val;                                                        \
632         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
633         struct fc_internal *i = to_fc_internal(shost->transportt);      \
634                                                                         \
635         val = simple_strtoul(buf, NULL, 0);                             \
636         i->f->set_host_##field(shost, val);                             \
637         return count;                                                   \
638 }
639
640 #define fc_host_rd_attr(field, format_string, sz)                       \
641         fc_host_show_function(field, format_string, sz, )               \
642 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
643                          show_fc_host_##field, NULL)
644
645 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
646         fc_host_show_function(field, format_string, sz, (cast))         \
647 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
648                           show_fc_host_##field, NULL)
649
650 #define fc_host_rw_attr(field, format_string, sz)                       \
651         fc_host_show_function(field, format_string, sz, )               \
652         fc_host_store_function(field)                                   \
653 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,             \
654                         show_fc_host_##field,                           \
655                         store_fc_host_##field)
656
657 #define fc_host_rd_enum_attr(title, maxlen)                             \
658 static ssize_t                                                          \
659 show_fc_host_##title (struct class_device *cdev, char *buf)             \
660 {                                                                       \
661         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
662         struct fc_internal *i = to_fc_internal(shost->transportt);      \
663         const char *name;                                               \
664         if (i->f->get_host_##title)                                     \
665                 i->f->get_host_##title(shost);                          \
666         name = get_fc_##title##_name(fc_host_##title(shost));           \
667         if (!name)                                                      \
668                 return -EINVAL;                                         \
669         return snprintf(buf, maxlen, "%s\n", name);                     \
670 }                                                                       \
671 static FC_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
672
673 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
674         i->private_host_attrs[count] = class_device_attr_host_##field;  \
675         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
676         i->private_host_attrs[count].store = NULL;                      \
677         i->host_attrs[count] = &i->private_host_attrs[count];           \
678         if (i->f->show_host_##field)                                    \
679                 count++
680
681 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
682         i->private_host_attrs[count] = class_device_attr_host_##field;  \
683         if (!i->f->set_host_##field) {                                  \
684                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
685                 i->private_host_attrs[count].store = NULL;              \
686         }                                                               \
687         i->host_attrs[count] = &i->private_host_attrs[count];           \
688         if (i->f->show_host_##field)                                    \
689                 count++
690
691
692 #define fc_private_host_show_function(field, format_string, sz, cast)   \
693 static ssize_t                                                          \
694 show_fc_host_##field (struct class_device *cdev, char *buf)             \
695 {                                                                       \
696         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
697         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
698 }
699
700 #define fc_private_host_rd_attr(field, format_string, sz)               \
701         fc_private_host_show_function(field, format_string, sz, )       \
702 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
703                          show_fc_host_##field, NULL)
704
705 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
706         fc_private_host_show_function(field, format_string, sz, (cast)) \
707 static FC_CLASS_DEVICE_ATTR(host, field, S_IRUGO,                       \
708                           show_fc_host_##field, NULL)
709
710 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
711         i->private_host_attrs[count] = class_device_attr_host_##field;  \
712         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
713         i->private_host_attrs[count].store = NULL;                      \
714         i->host_attrs[count] = &i->private_host_attrs[count];           \
715         count++
716
717 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
718         i->private_host_attrs[count] = class_device_attr_host_##field;  \
719         i->host_attrs[count] = &i->private_host_attrs[count];           \
720         count++
721
722
723 /* Fixed Host Attributes */
724
725 static ssize_t
726 show_fc_host_supported_classes (struct class_device *cdev, char *buf)
727 {
728         struct Scsi_Host *shost = transport_class_to_shost(cdev);
729
730         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
731                 return snprintf(buf, 20, "unspecified\n");
732
733         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
734 }
735 static FC_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
736                 show_fc_host_supported_classes, NULL);
737
738 static ssize_t
739 show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
740 {
741         struct Scsi_Host *shost = transport_class_to_shost(cdev);
742         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
743 }
744 static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
745                 show_fc_host_supported_fc4s, NULL);
746
747 static ssize_t
748 show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
749 {
750         struct Scsi_Host *shost = transport_class_to_shost(cdev);
751
752         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
753                 return snprintf(buf, 20, "unknown\n");
754
755         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
756 }
757 static FC_CLASS_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
758                 show_fc_host_supported_speeds, NULL);
759
760
761 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
762 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
763 fc_private_host_rd_attr(symbolic_name, "%s\n", (FC_SYMBOLIC_NAME_SIZE +1));
764 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
765 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
766
767
768 /* Dynamic Host Attributes */
769
770 static ssize_t
771 show_fc_host_active_fc4s (struct class_device *cdev, char *buf)
772 {
773         struct Scsi_Host *shost = transport_class_to_shost(cdev);
774         struct fc_internal *i = to_fc_internal(shost->transportt);
775
776         if (i->f->get_host_active_fc4s)
777                 i->f->get_host_active_fc4s(shost);
778
779         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
780 }
781 static FC_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
782                 show_fc_host_active_fc4s, NULL);
783
784 static ssize_t
785 show_fc_host_speed (struct class_device *cdev, char *buf)
786 {
787         struct Scsi_Host *shost = transport_class_to_shost(cdev);
788         struct fc_internal *i = to_fc_internal(shost->transportt);
789
790         if (i->f->get_host_speed)
791                 i->f->get_host_speed(shost);
792
793         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
794                 return snprintf(buf, 20, "unknown\n");
795
796         return get_fc_port_speed_names(fc_host_speed(shost), buf);
797 }
798 static FC_CLASS_DEVICE_ATTR(host, speed, S_IRUGO,
799                 show_fc_host_speed, NULL);
800
801
802 fc_host_rd_attr(port_id, "0x%06x\n", 20);
803 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
804 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
805 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
806
807
808 /* Private Host Attributes */
809
810 static ssize_t
811 show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
812 {
813         struct Scsi_Host *shost = transport_class_to_shost(cdev);
814         const char *name;
815
816         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
817         if (!name)
818                 return -EINVAL;
819         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
820 }
821
822 static ssize_t
823 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
824         const char *buf, size_t count)
825 {
826         struct Scsi_Host *shost = transport_class_to_shost(cdev);
827         struct fc_rport *rport, *next_rport;
828         enum fc_tgtid_binding_type val;
829         unsigned long flags;
830
831         if (get_fc_tgtid_bind_type_match(buf, &val))
832                 return -EINVAL;
833
834         /* if changing bind type, purge all unused consistent bindings */
835         if (val != fc_host_tgtid_bind_type(shost)) {
836                 spin_lock_irqsave(shost->host_lock, flags);
837                 list_for_each_entry_safe(rport, next_rport,
838                                 &fc_host_rport_bindings(shost), peers)
839                         fc_rport_terminate(rport);
840                 spin_unlock_irqrestore(shost->host_lock, flags);
841         }
842
843         fc_host_tgtid_bind_type(shost) = val;
844         return count;
845 }
846
847 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
848                         show_fc_private_host_tgtid_bind_type,
849                         store_fc_private_host_tgtid_bind_type);
850
851 /*
852  * Host Statistics Management
853  */
854
855 /* Show a given an attribute in the statistics group */
856 static ssize_t
857 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
858 {
859         struct Scsi_Host *shost = transport_class_to_shost(cdev);
860         struct fc_internal *i = to_fc_internal(shost->transportt);
861         struct fc_host_statistics *stats;
862         ssize_t ret = -ENOENT;
863
864         if (offset > sizeof(struct fc_host_statistics) ||
865             offset % sizeof(u64) != 0)
866                 WARN_ON(1);
867
868         if (i->f->get_fc_host_stats) {
869                 stats = (i->f->get_fc_host_stats)(shost);
870                 if (stats)
871                         ret = snprintf(buf, 20, "0x%llx\n",
872                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
873         }
874         return ret;
875 }
876
877
878 /* generate a read-only statistics attribute */
879 #define fc_host_statistic(name)                                         \
880 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
881 {                                                                       \
882         return fc_stat_show(cd, buf,                                    \
883                             offsetof(struct fc_host_statistics, name)); \
884 }                                                                       \
885 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
886
887 fc_host_statistic(seconds_since_last_reset);
888 fc_host_statistic(tx_frames);
889 fc_host_statistic(tx_words);
890 fc_host_statistic(rx_frames);
891 fc_host_statistic(rx_words);
892 fc_host_statistic(lip_count);
893 fc_host_statistic(nos_count);
894 fc_host_statistic(error_frames);
895 fc_host_statistic(dumped_frames);
896 fc_host_statistic(link_failure_count);
897 fc_host_statistic(loss_of_sync_count);
898 fc_host_statistic(loss_of_signal_count);
899 fc_host_statistic(prim_seq_protocol_err_count);
900 fc_host_statistic(invalid_tx_word_count);
901 fc_host_statistic(invalid_crc_count);
902 fc_host_statistic(fcp_input_requests);
903 fc_host_statistic(fcp_output_requests);
904 fc_host_statistic(fcp_control_requests);
905 fc_host_statistic(fcp_input_megabytes);
906 fc_host_statistic(fcp_output_megabytes);
907
908 static ssize_t
909 fc_reset_statistics(struct class_device *cdev, const char *buf,
910                            size_t count)
911 {
912         struct Scsi_Host *shost = transport_class_to_shost(cdev);
913         struct fc_internal *i = to_fc_internal(shost->transportt);
914
915         /* ignore any data value written to the attribute */
916         if (i->f->reset_fc_host_stats) {
917                 i->f->reset_fc_host_stats(shost);
918                 return count;
919         }
920
921         return -ENOENT;
922 }
923 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
924                                 fc_reset_statistics);
925
926
927 static struct attribute *fc_statistics_attrs[] = {
928         &class_device_attr_host_seconds_since_last_reset.attr,
929         &class_device_attr_host_tx_frames.attr,
930         &class_device_attr_host_tx_words.attr,
931         &class_device_attr_host_rx_frames.attr,
932         &class_device_attr_host_rx_words.attr,
933         &class_device_attr_host_lip_count.attr,
934         &class_device_attr_host_nos_count.attr,
935         &class_device_attr_host_error_frames.attr,
936         &class_device_attr_host_dumped_frames.attr,
937         &class_device_attr_host_link_failure_count.attr,
938         &class_device_attr_host_loss_of_sync_count.attr,
939         &class_device_attr_host_loss_of_signal_count.attr,
940         &class_device_attr_host_prim_seq_protocol_err_count.attr,
941         &class_device_attr_host_invalid_tx_word_count.attr,
942         &class_device_attr_host_invalid_crc_count.attr,
943         &class_device_attr_host_fcp_input_requests.attr,
944         &class_device_attr_host_fcp_output_requests.attr,
945         &class_device_attr_host_fcp_control_requests.attr,
946         &class_device_attr_host_fcp_input_megabytes.attr,
947         &class_device_attr_host_fcp_output_megabytes.attr,
948         &class_device_attr_host_reset_statistics.attr,
949         NULL
950 };
951
952 static struct attribute_group fc_statistics_group = {
953         .name = "statistics",
954         .attrs = fc_statistics_attrs,
955 };
956
957 static int fc_host_match(struct attribute_container *cont,
958                           struct device *dev)
959 {
960         struct Scsi_Host *shost;
961         struct fc_internal *i;
962
963         if (!scsi_is_host_device(dev))
964                 return 0;
965
966         shost = dev_to_shost(dev);
967         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
968             != &fc_host_class.class)
969                 return 0;
970
971         i = to_fc_internal(shost->transportt);
972
973         return &i->t.host_attrs.ac == cont;
974 }
975
976 static int fc_target_match(struct attribute_container *cont,
977                             struct device *dev)
978 {
979         struct Scsi_Host *shost;
980         struct fc_internal *i;
981
982         if (!scsi_is_target_device(dev))
983                 return 0;
984
985         shost = dev_to_shost(dev->parent);
986         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
987             != &fc_host_class.class)
988                 return 0;
989
990         i = to_fc_internal(shost->transportt);
991
992         return &i->t.target_attrs.ac == cont;
993 }
994
995 static void fc_rport_dev_release(struct device *dev)
996 {
997         struct fc_rport *rport = dev_to_rport(dev);
998         put_device(dev->parent);
999         kfree(rport);
1000 }
1001
1002 int scsi_is_fc_rport(const struct device *dev)
1003 {
1004         return dev->release == fc_rport_dev_release;
1005 }
1006 EXPORT_SYMBOL(scsi_is_fc_rport);
1007
1008 static int fc_rport_match(struct attribute_container *cont,
1009                             struct device *dev)
1010 {
1011         struct Scsi_Host *shost;
1012         struct fc_internal *i;
1013
1014         if (!scsi_is_fc_rport(dev))
1015                 return 0;
1016
1017         shost = dev_to_shost(dev->parent);
1018         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1019             != &fc_host_class.class)
1020                 return 0;
1021
1022         i = to_fc_internal(shost->transportt);
1023
1024         return &i->rport_attr_cont.ac == cont;
1025 }
1026
1027
1028 /*
1029  * Must be called with shost->host_lock held
1030  */
1031 static struct device *fc_target_parent(struct Scsi_Host *shost,
1032                                         int channel, uint id)
1033 {
1034         struct fc_rport *rport;
1035
1036         list_for_each_entry(rport, &fc_host_rports(shost), peers)
1037                 if ((rport->channel == channel) &&
1038                     (rport->scsi_target_id == id))
1039                         return &rport->dev;
1040
1041         return NULL;
1042 }
1043
1044 struct scsi_transport_template *
1045 fc_attach_transport(struct fc_function_template *ft)
1046 {
1047         struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
1048                                         GFP_KERNEL);
1049         int count;
1050
1051         if (unlikely(!i))
1052                 return NULL;
1053
1054         memset(i, 0, sizeof(struct fc_internal));
1055
1056         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1057         i->t.target_attrs.ac.class = &fc_transport_class.class;
1058         i->t.target_attrs.ac.match = fc_target_match;
1059         i->t.target_size = sizeof(struct fc_starget_attrs);
1060         transport_container_register(&i->t.target_attrs);
1061
1062         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1063         i->t.host_attrs.ac.class = &fc_host_class.class;
1064         i->t.host_attrs.ac.match = fc_host_match;
1065         i->t.host_size = sizeof(struct fc_host_attrs);
1066         if (ft->get_fc_host_stats)
1067                 i->t.host_attrs.statistics = &fc_statistics_group;
1068         transport_container_register(&i->t.host_attrs);
1069
1070         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1071         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1072         i->rport_attr_cont.ac.match = fc_rport_match;
1073         transport_container_register(&i->rport_attr_cont);
1074
1075         i->f = ft;
1076
1077         /* Transport uses the shost workq for scsi scanning */
1078         i->t.create_work_queue = 1;
1079
1080         i->t.target_parent = fc_target_parent;
1081         
1082         /*
1083          * Setup SCSI Target Attributes.
1084          */
1085         count = 0;
1086         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1087         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1088         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1089
1090         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1091
1092         i->starget_attrs[count] = NULL;
1093
1094
1095         /*
1096          * Setup SCSI Host Attributes.
1097          */
1098         count=0;
1099         SETUP_HOST_ATTRIBUTE_RD(node_name);
1100         SETUP_HOST_ATTRIBUTE_RD(port_name);
1101         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1102         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1103         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1104         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1105         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1106         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1107
1108         SETUP_HOST_ATTRIBUTE_RD(port_id);
1109         SETUP_HOST_ATTRIBUTE_RD(port_type);
1110         SETUP_HOST_ATTRIBUTE_RD(port_state);
1111         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1112         SETUP_HOST_ATTRIBUTE_RD(speed);
1113         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1114
1115         /* Transport-managed attributes */
1116         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1117
1118         BUG_ON(count > FC_HOST_NUM_ATTRS);
1119
1120         i->host_attrs[count] = NULL;
1121
1122         /*
1123          * Setup Remote Port Attributes.
1124          */
1125         count=0;
1126         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1127         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1128         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1129         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1130         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1131         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1132         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1133         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1134         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1135
1136         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1137
1138         i->rport_attrs[count] = NULL;
1139
1140         return &i->t;
1141 }
1142 EXPORT_SYMBOL(fc_attach_transport);
1143
1144 void fc_release_transport(struct scsi_transport_template *t)
1145 {
1146         struct fc_internal *i = to_fc_internal(t);
1147
1148         transport_container_unregister(&i->t.target_attrs);
1149         transport_container_unregister(&i->t.host_attrs);
1150         transport_container_unregister(&i->rport_attr_cont);
1151
1152         kfree(i);
1153 }
1154 EXPORT_SYMBOL(fc_release_transport);
1155
1156
1157 /**
1158  * fc_remove_host - called to terminate any fc_transport-related elements
1159  *                  for a scsi host.
1160  * @rport:      remote port to be unblocked.
1161  *
1162  * This routine is expected to be called immediately preceeding the
1163  * a driver's call to scsi_remove_host().
1164  *
1165  * WARNING: A driver utilizing the fc_transport, which fails to call
1166  *   this routine prior to scsi_remote_host(), will leave dangling
1167  *   objects in /sys/class/fc_remote_ports. Access to any of these
1168  *   objects can result in a system crash !!!
1169  *
1170  * Notes:
1171  *      This routine assumes no locks are held on entry.
1172  **/
1173 void
1174 fc_remove_host(struct Scsi_Host *shost)
1175 {
1176         struct fc_rport *rport, *next_rport;
1177
1178         /* Remove any remote ports */
1179         list_for_each_entry_safe(rport, next_rport,
1180                         &fc_host_rports(shost), peers)
1181                 fc_rport_terminate(rport);
1182         list_for_each_entry_safe(rport, next_rport,
1183                         &fc_host_rport_bindings(shost), peers)
1184                 fc_rport_terminate(rport);
1185 }
1186 EXPORT_SYMBOL(fc_remove_host);
1187
1188 /**
1189  * fc_rport_create - allocates and creates a remote FC port.
1190  * @shost:      scsi host the remote port is connected to.
1191  * @channel:    Channel on shost port connected to.
1192  * @ids:        The world wide names, fc address, and FC4 port
1193  *              roles for the remote port.
1194  *
1195  * Allocates and creates the remoter port structure, including the
1196  * class and sysfs creation.
1197  *
1198  * Notes:
1199  *      This routine assumes no locks are held on entry.
1200  **/
1201 struct fc_rport *
1202 fc_rport_create(struct Scsi_Host *shost, int channel,
1203         struct fc_rport_identifiers  *ids)
1204 {
1205         struct fc_host_attrs *fc_host =
1206                         (struct fc_host_attrs *)shost->shost_data;
1207         struct fc_internal *fci = to_fc_internal(shost->transportt);
1208         struct fc_rport *rport;
1209         struct device *dev;
1210         unsigned long flags;
1211         int error;
1212         size_t size;
1213
1214         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1215         rport = kmalloc(size, GFP_KERNEL);
1216         if (unlikely(!rport)) {
1217                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1218                 return NULL;
1219         }
1220         memset(rport, 0, size);
1221
1222         rport->maxframe_size = -1;
1223         rport->supported_classes = FC_COS_UNSPECIFIED;
1224         rport->dev_loss_tmo = fc_dev_loss_tmo;
1225         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1226         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1227         rport->port_id = ids->port_id;
1228         rport->roles = ids->roles;
1229         rport->port_state = FC_PORTSTATE_ONLINE;
1230         if (fci->f->dd_fcrport_size)
1231                 rport->dd_data = &rport[1];
1232         rport->channel = channel;
1233
1234         INIT_WORK(&rport->dev_loss_work, fc_timeout_blocked_rport, rport);
1235         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1236
1237         spin_lock_irqsave(shost->host_lock, flags);
1238
1239         rport->number = fc_host->next_rport_number++;
1240         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1241                 rport->scsi_target_id = fc_host->next_target_id++;
1242         else
1243                 rport->scsi_target_id = -1;
1244         list_add_tail(&rport->peers, &fc_host_rports(shost));
1245         get_device(&shost->shost_gendev);
1246
1247         spin_unlock_irqrestore(shost->host_lock, flags);
1248
1249         dev = &rport->dev;
1250         device_initialize(dev);
1251         dev->parent = get_device(&shost->shost_gendev);
1252         dev->release = fc_rport_dev_release;
1253         sprintf(dev->bus_id, "rport-%d:%d-%d",
1254                 shost->host_no, channel, rport->number);
1255         transport_setup_device(dev);
1256
1257         error = device_add(dev);
1258         if (error) {
1259                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1260                 goto delete_rport;
1261         }
1262         transport_add_device(dev);
1263         transport_configure_device(dev);
1264
1265         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1266                 /* initiate a scan of the target */
1267                 scsi_queue_work(shost, &rport->scan_work);
1268
1269         return rport;
1270
1271 delete_rport:
1272         transport_destroy_device(dev);
1273         put_device(dev->parent);
1274         spin_lock_irqsave(shost->host_lock, flags);
1275         list_del(&rport->peers);
1276         put_device(&shost->shost_gendev);
1277         spin_unlock_irqrestore(shost->host_lock, flags);
1278         put_device(dev->parent);
1279         kfree(rport);
1280         return NULL;
1281 }
1282
1283 /**
1284  * fc_remote_port_add - notifies the fc transport of the existence
1285  *              of a remote FC port.
1286  * @shost:      scsi host the remote port is connected to.
1287  * @channel:    Channel on shost port connected to.
1288  * @ids:        The world wide names, fc address, and FC4 port
1289  *              roles for the remote port.
1290  *
1291  * The LLDD calls this routine to notify the transport of the existence
1292  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1293  * of the port, it's FC address (port_id), and the FC4 roles that are
1294  * active for the port.
1295  *
1296  * For ports that are FCP targets (aka scsi targets), the FC transport
1297  * maintains consistent target id bindings on behalf of the LLDD.
1298  * A consistent target id binding is an assignment of a target id to
1299  * a remote port identifier, which persists while the scsi host is
1300  * attached. The remote port can disappear, then later reappear, and
1301  * it's target id assignment remains the same. This allows for shifts
1302  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1303  * changes to the scsi subsystem which is based on scsi host number and
1304  * target id values.  Bindings are only valid during the attachment of
1305  * the scsi host. If the host detaches, then later re-attaches, target
1306  * id bindings may change.
1307  *
1308  * This routine is responsible for returning a remote port structure.
1309  * The routine will search the list of remote ports it maintains
1310  * internally on behalf of consistent target id mappings. If found, the
1311  * remote port structure will be reused. Otherwise, a new remote port
1312  * structure will be allocated.
1313  *
1314  * Whenever a remote port is allocated, a new fc_remote_port class
1315  * device is created.
1316  *
1317  * Should not be called from interrupt context.
1318  *
1319  * Notes:
1320  *      This routine assumes no locks are held on entry.
1321  **/
1322 struct fc_rport *
1323 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1324         struct fc_rport_identifiers  *ids)
1325 {
1326         struct fc_rport *rport;
1327         unsigned long flags;
1328         int match = 0;
1329
1330         if (likely((ids->roles & FC_RPORT_ROLE_FCP_TARGET) &&
1331                 (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE))) {
1332
1333                 /* search for a matching consistent binding */
1334
1335                 spin_lock_irqsave(shost->host_lock, flags);
1336
1337                 list_for_each_entry(rport, &fc_host_rport_bindings(shost),
1338                                         peers) {
1339                         if (rport->channel != channel)
1340                                 continue;
1341
1342                         switch (fc_host_tgtid_bind_type(shost)) {
1343                         case FC_TGTID_BIND_BY_WWPN:
1344                                 if (rport->port_name == ids->port_name)
1345                                         match = 1;
1346                                 break;
1347                         case FC_TGTID_BIND_BY_WWNN:
1348                                 if (rport->node_name == ids->node_name)
1349                                         match = 1;
1350                                 break;
1351                         case FC_TGTID_BIND_BY_ID:
1352                                 if (rport->port_id == ids->port_id)
1353                                         match = 1;
1354                                 break;
1355                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1356                                 break;
1357                         }
1358
1359                         if (match) {
1360                                 list_move_tail(&rport->peers,
1361                                         &fc_host_rports(shost));
1362                                 break;
1363                         }
1364                 }
1365
1366                 spin_unlock_irqrestore(shost->host_lock, flags);
1367
1368                 if (match) {
1369                         memcpy(&rport->node_name, &ids->node_name,
1370                                 sizeof(rport->node_name));
1371                         memcpy(&rport->port_name, &ids->port_name,
1372                                 sizeof(rport->port_name));
1373                         rport->port_id = ids->port_id;
1374                         rport->roles = ids->roles;
1375                         rport->port_state = FC_PORTSTATE_ONLINE;
1376
1377                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1378                                 /* initiate a scan of the target */
1379                                 scsi_queue_work(shost, &rport->scan_work);
1380
1381                         return rport;
1382                 }
1383         }
1384
1385         /* No consistent binding found - create new remote port entry */
1386         rport = fc_rport_create(shost, channel, ids);
1387
1388         return rport;
1389 }
1390 EXPORT_SYMBOL(fc_remote_port_add);
1391
1392 /*
1393  * fc_rport_tgt_remove - Removes the scsi target on the remote port
1394  * @rport:      The remote port to be operated on
1395  */
1396 static void
1397 fc_rport_tgt_remove(struct fc_rport *rport)
1398 {
1399         struct Scsi_Host *shost = rport_to_shost(rport);
1400
1401         scsi_target_unblock(&rport->dev);
1402
1403         /* Stop anything on the workq */
1404         if (!cancel_delayed_work(&rport->dev_loss_work))
1405                 flush_scheduled_work();
1406         scsi_flush_work(shost);
1407
1408         scsi_remove_target(&rport->dev);
1409 }
1410
1411 /*
1412  * fc_rport_terminate - this routine tears down and deallocates a remote port.
1413  * @rport:      The remote port to be terminated
1414  *
1415  * Notes:
1416  *      This routine assumes no locks are held on entry.
1417  */
1418 static void
1419 fc_rport_terminate(struct fc_rport  *rport)
1420 {
1421         struct Scsi_Host *shost = rport_to_shost(rport);
1422         struct device *dev = &rport->dev;
1423         unsigned long flags;
1424
1425         fc_rport_tgt_remove(rport);
1426
1427         transport_remove_device(dev);
1428         device_del(dev);
1429         transport_destroy_device(dev);
1430         spin_lock_irqsave(shost->host_lock, flags);
1431         list_del(&rport->peers);
1432         spin_unlock_irqrestore(shost->host_lock, flags);
1433         put_device(&shost->shost_gendev);
1434 }
1435
1436 /**
1437  * fc_remote_port_delete - notifies the fc transport that a remote
1438  *              port is no longer in existence.
1439  * @rport:      The remote port that no longer exists
1440  *
1441  * The LLDD calls this routine to notify the transport that a remote
1442  * port is no longer part of the topology. Note: Although a port
1443  * may no longer be part of the topology, it may persist in the remote
1444  * ports displayed by the fc_host. This is done so that target id
1445  * mappings (managed via the remote port structures), are always visible
1446  * as long as the mapping is valid, regardless of port state,
1447  *
1448  * If the remote port is not an FCP Target, it will be fully torn down
1449  * and deallocated, including the fc_remote_port class device.
1450  *
1451  * If the remote port is an FCP Target, the port structure will be
1452  * marked as Not Present, but will remain as long as there is a valid
1453  * SCSI target id mapping associated with the port structure. Validity
1454  * is determined by the binding type. If binding by wwpn, then the port
1455  * structure is always valid and will not be deallocated until the host
1456  * is removed.  If binding by wwnn, then the port structure is valid
1457  * until another port with the same node name is found in the topology.
1458  * If binding by port id (fc address), then the port structure is valid
1459  * valid until another port with the same address is identified.
1460  *
1461  * Called from interrupt or normal process context.
1462  *
1463  * Notes:
1464  *      This routine assumes no locks are held on entry.
1465  **/
1466 void
1467 fc_remote_port_delete(struct fc_rport  *rport)
1468 {
1469         struct Scsi_Host *shost = rport_to_shost(rport);
1470         unsigned long flags;
1471
1472         /* If no scsi target id mapping or consistent binding type, delete it */
1473         if ((rport->scsi_target_id == -1) ||
1474             (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE)) {
1475                 fc_rport_terminate(rport);
1476                 return;
1477         }
1478
1479         fc_rport_tgt_remove(rport);
1480
1481         spin_lock_irqsave(shost->host_lock, flags);
1482         list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
1483         spin_unlock_irqrestore(shost->host_lock, flags);
1484
1485         /*
1486          * Note: We do not remove or clear the hostdata area. This allows
1487          *   host-specific target data to persist along with the
1488          *   scsi_target_id. It's up to the host to manage it's hostdata area.
1489          */
1490
1491         /*
1492          * Reinitialize port attributes that may change if the port comes back.
1493          */
1494         rport->maxframe_size = -1;
1495         rport->supported_classes = FC_COS_UNSPECIFIED;
1496         rport->roles = FC_RPORT_ROLE_UNKNOWN;
1497         rport->port_state = FC_PORTSTATE_NOTPRESENT;
1498
1499         /* remove the identifiers that aren't used in the consisting binding */
1500         switch (fc_host_tgtid_bind_type(shost)) {
1501         case FC_TGTID_BIND_BY_WWPN:
1502                 rport->node_name = -1;
1503                 rport->port_id = -1;
1504                 break;
1505         case FC_TGTID_BIND_BY_WWNN:
1506                 rport->port_name = -1;
1507                 rport->port_id = -1;
1508                 break;
1509         case FC_TGTID_BIND_BY_ID:
1510                 rport->node_name = -1;
1511                 rport->port_name = -1;
1512                 break;
1513         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
1514                 break;
1515         }
1516 }
1517 EXPORT_SYMBOL(fc_remote_port_delete);
1518
1519 /**
1520  * fc_remote_port_rolechg - notifies the fc transport that the roles
1521  *              on a remote may have changed.
1522  * @rport:      The remote port that changed.
1523  *
1524  * The LLDD calls this routine to notify the transport that the roles
1525  * on a remote port may have changed. The largest effect of this is
1526  * if a port now becomes a FCP Target, it must be allocated a
1527  * scsi target id.  If the port is no longer a FCP target, any
1528  * scsi target id value assigned to it will persist in case the
1529  * role changes back to include FCP Target. No changes in the scsi
1530  * midlayer will be invoked if the role changes (in the expectation
1531  * that the role will be resumed. If it doesn't normal error processing
1532  * will take place).
1533  *
1534  * Should not be called from interrupt context.
1535  *
1536  * Notes:
1537  *      This routine assumes no locks are held on entry.
1538  **/
1539 void
1540 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1541 {
1542         struct Scsi_Host *shost = rport_to_shost(rport);
1543         struct fc_host_attrs *fc_host =
1544                         (struct fc_host_attrs *)shost->shost_data;
1545         unsigned long flags;
1546         int create = 0;
1547
1548         rport->roles = roles;
1549
1550         spin_lock_irqsave(shost->host_lock, flags);
1551         if ((rport->scsi_target_id == -1) &&
1552             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
1553                 rport->scsi_target_id = fc_host->next_target_id++;
1554                 create = 1;
1555         }
1556         spin_unlock_irqrestore(shost->host_lock, flags);
1557
1558         if (create)
1559                 /* initiate a scan of the target */
1560                 scsi_queue_work(shost, &rport->scan_work);
1561 }
1562 EXPORT_SYMBOL(fc_remote_port_rolechg);
1563
1564 /**
1565  * fc_timeout_blocked_rport - Timeout handler for blocked remote port
1566  *                       that fails to return in the alloted time.
1567  * @data:       scsi target that failed to reappear in the alloted time.
1568  **/
1569 static void
1570 fc_timeout_blocked_rport(void  *data)
1571 {
1572         struct fc_rport *rport = (struct fc_rport *)data;
1573
1574         rport->port_state = FC_PORTSTATE_OFFLINE;
1575
1576         dev_printk(KERN_ERR, &rport->dev,
1577                 "blocked FC remote port time out: removing target\n");
1578
1579         /*
1580          * As this only occurs if the remote port (scsi target)
1581          * went away and didn't come back - we'll remove
1582          * all attached scsi devices.
1583          */
1584         scsi_target_unblock(&rport->dev);
1585         scsi_remove_target(&rport->dev);
1586 }
1587
1588 /**
1589  * fc_remote_port_block - temporarily block any scsi traffic to a remote port.
1590  * @rport:      remote port to be blocked.
1591  *
1592  * scsi lldd's with a FC transport call this routine to temporarily stop
1593  * all scsi traffic to a remote port. If the port is not a SCSI target,
1594  * no action is taken. If the port is a SCSI target, all attached devices
1595  * are placed into a SDEV_BLOCK state and a timer is started. The timer is
1596  * represents the maximum amount of time the port may be blocked. If the
1597  * timer expires, the port is considered non-existent and the attached
1598  * scsi devices will be removed.
1599  *
1600  * Called from interrupt or normal process context.
1601  *
1602  * Returns zero if successful or error if not
1603  *
1604  * Notes:
1605  *      This routine assumes no locks are held on entry.
1606  *
1607  *      The timeout and timer types are extracted from the fc transport 
1608  *      attributes from the caller's rport pointer.
1609  **/
1610 int
1611 fc_remote_port_block(struct fc_rport *rport)
1612 {
1613         int timeout = rport->dev_loss_tmo;
1614         struct work_struct *work = &rport->dev_loss_work;
1615
1616         if (timeout < 0 || timeout > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1617                 return -EINVAL;
1618
1619         scsi_target_block(&rport->dev);
1620
1621         /* cap the length the devices can be blocked */
1622         schedule_delayed_work(work, timeout * HZ);
1623
1624         rport->port_state = FC_PORTSTATE_BLOCKED;
1625         return 0;
1626 }
1627 EXPORT_SYMBOL(fc_remote_port_block);
1628
1629 /**
1630  * fc_remote_port_unblock - restart any blocked scsi traffic to a remote port.
1631  * @rport:      remote port to be unblocked.
1632  *
1633  * scsi lld's with a FC transport call this routine to restart IO to all
1634  * devices associated with the caller's scsi target following a fc_target_block
1635  * request.  Called from interrupt or normal process context.
1636  *
1637  * Notes:
1638  *      This routine assumes no locks are held on entry.
1639  **/
1640  void
1641 fc_remote_port_unblock(struct fc_rport *rport)
1642 {
1643         struct work_struct *work = &rport->dev_loss_work;
1644         struct Scsi_Host *shost = rport_to_shost(rport);
1645
1646         /*
1647          * Stop the target timer first. Take no action on the del_timer
1648          * failure as the state machine state change will validate the
1649          * transaction.
1650          */
1651         if (!cancel_delayed_work(work))
1652                 flush_scheduled_work();
1653
1654         if (rport->port_state == FC_PORTSTATE_OFFLINE)
1655                 /*
1656                  * initiate a scan of the target as the target has
1657                  * been torn down.
1658                  */
1659                 scsi_queue_work(shost, &rport->scan_work);
1660         else
1661                 scsi_target_unblock(&rport->dev);
1662
1663         rport->port_state = FC_PORTSTATE_ONLINE;
1664 }
1665 EXPORT_SYMBOL(fc_remote_port_unblock);
1666
1667 /**
1668  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
1669  * @data:       remote port to be scanned.
1670  **/
1671 static void
1672 fc_scsi_scan_rport(void *data)
1673 {
1674         struct fc_rport *rport = (struct fc_rport *)data;
1675
1676         scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
1677                         SCAN_WILD_CARD, 1);
1678 }
1679
1680
1681 MODULE_AUTHOR("Martin Hicks");
1682 MODULE_DESCRIPTION("FC Transport Attributes");
1683 MODULE_LICENSE("GPL");
1684
1685 module_init(fc_transport_init);
1686 module_exit(fc_transport_exit);