[SCSI] FW: [PATCH] for Deadlock in transport_fc
[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 #define get_list_head_entry(pos, head, member)          \
823         pos = list_entry((head)->next, typeof(*pos), member)
824
825 static ssize_t
826 store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
827         const char *buf, size_t count)
828 {
829         struct Scsi_Host *shost = transport_class_to_shost(cdev);
830         struct fc_rport *rport;
831         enum fc_tgtid_binding_type val;
832         unsigned long flags;
833
834         if (get_fc_tgtid_bind_type_match(buf, &val))
835                 return -EINVAL;
836
837         /* if changing bind type, purge all unused consistent bindings */
838         if (val != fc_host_tgtid_bind_type(shost)) {
839                 spin_lock_irqsave(shost->host_lock, flags);
840                 while (!list_empty(&fc_host_rport_bindings(shost))) {
841                         get_list_head_entry(rport,
842                                 &fc_host_rport_bindings(shost), peers);
843                         spin_unlock_irqrestore(shost->host_lock, flags);
844                         fc_rport_terminate(rport);
845                         spin_lock_irqsave(shost->host_lock, flags);
846                 }
847                 spin_unlock_irqrestore(shost->host_lock, flags);
848         }
849
850         fc_host_tgtid_bind_type(shost) = val;
851         return count;
852 }
853
854 static FC_CLASS_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
855                         show_fc_private_host_tgtid_bind_type,
856                         store_fc_private_host_tgtid_bind_type);
857
858 /*
859  * Host Statistics Management
860  */
861
862 /* Show a given an attribute in the statistics group */
863 static ssize_t
864 fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
865 {
866         struct Scsi_Host *shost = transport_class_to_shost(cdev);
867         struct fc_internal *i = to_fc_internal(shost->transportt);
868         struct fc_host_statistics *stats;
869         ssize_t ret = -ENOENT;
870
871         if (offset > sizeof(struct fc_host_statistics) ||
872             offset % sizeof(u64) != 0)
873                 WARN_ON(1);
874
875         if (i->f->get_fc_host_stats) {
876                 stats = (i->f->get_fc_host_stats)(shost);
877                 if (stats)
878                         ret = snprintf(buf, 20, "0x%llx\n",
879                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
880         }
881         return ret;
882 }
883
884
885 /* generate a read-only statistics attribute */
886 #define fc_host_statistic(name)                                         \
887 static ssize_t show_fcstat_##name(struct class_device *cd, char *buf)   \
888 {                                                                       \
889         return fc_stat_show(cd, buf,                                    \
890                             offsetof(struct fc_host_statistics, name)); \
891 }                                                                       \
892 static FC_CLASS_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
893
894 fc_host_statistic(seconds_since_last_reset);
895 fc_host_statistic(tx_frames);
896 fc_host_statistic(tx_words);
897 fc_host_statistic(rx_frames);
898 fc_host_statistic(rx_words);
899 fc_host_statistic(lip_count);
900 fc_host_statistic(nos_count);
901 fc_host_statistic(error_frames);
902 fc_host_statistic(dumped_frames);
903 fc_host_statistic(link_failure_count);
904 fc_host_statistic(loss_of_sync_count);
905 fc_host_statistic(loss_of_signal_count);
906 fc_host_statistic(prim_seq_protocol_err_count);
907 fc_host_statistic(invalid_tx_word_count);
908 fc_host_statistic(invalid_crc_count);
909 fc_host_statistic(fcp_input_requests);
910 fc_host_statistic(fcp_output_requests);
911 fc_host_statistic(fcp_control_requests);
912 fc_host_statistic(fcp_input_megabytes);
913 fc_host_statistic(fcp_output_megabytes);
914
915 static ssize_t
916 fc_reset_statistics(struct class_device *cdev, const char *buf,
917                            size_t count)
918 {
919         struct Scsi_Host *shost = transport_class_to_shost(cdev);
920         struct fc_internal *i = to_fc_internal(shost->transportt);
921
922         /* ignore any data value written to the attribute */
923         if (i->f->reset_fc_host_stats) {
924                 i->f->reset_fc_host_stats(shost);
925                 return count;
926         }
927
928         return -ENOENT;
929 }
930 static FC_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
931                                 fc_reset_statistics);
932
933
934 static struct attribute *fc_statistics_attrs[] = {
935         &class_device_attr_host_seconds_since_last_reset.attr,
936         &class_device_attr_host_tx_frames.attr,
937         &class_device_attr_host_tx_words.attr,
938         &class_device_attr_host_rx_frames.attr,
939         &class_device_attr_host_rx_words.attr,
940         &class_device_attr_host_lip_count.attr,
941         &class_device_attr_host_nos_count.attr,
942         &class_device_attr_host_error_frames.attr,
943         &class_device_attr_host_dumped_frames.attr,
944         &class_device_attr_host_link_failure_count.attr,
945         &class_device_attr_host_loss_of_sync_count.attr,
946         &class_device_attr_host_loss_of_signal_count.attr,
947         &class_device_attr_host_prim_seq_protocol_err_count.attr,
948         &class_device_attr_host_invalid_tx_word_count.attr,
949         &class_device_attr_host_invalid_crc_count.attr,
950         &class_device_attr_host_fcp_input_requests.attr,
951         &class_device_attr_host_fcp_output_requests.attr,
952         &class_device_attr_host_fcp_control_requests.attr,
953         &class_device_attr_host_fcp_input_megabytes.attr,
954         &class_device_attr_host_fcp_output_megabytes.attr,
955         &class_device_attr_host_reset_statistics.attr,
956         NULL
957 };
958
959 static struct attribute_group fc_statistics_group = {
960         .name = "statistics",
961         .attrs = fc_statistics_attrs,
962 };
963
964 static int fc_host_match(struct attribute_container *cont,
965                           struct device *dev)
966 {
967         struct Scsi_Host *shost;
968         struct fc_internal *i;
969
970         if (!scsi_is_host_device(dev))
971                 return 0;
972
973         shost = dev_to_shost(dev);
974         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
975             != &fc_host_class.class)
976                 return 0;
977
978         i = to_fc_internal(shost->transportt);
979
980         return &i->t.host_attrs.ac == cont;
981 }
982
983 static int fc_target_match(struct attribute_container *cont,
984                             struct device *dev)
985 {
986         struct Scsi_Host *shost;
987         struct fc_internal *i;
988
989         if (!scsi_is_target_device(dev))
990                 return 0;
991
992         shost = dev_to_shost(dev->parent);
993         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
994             != &fc_host_class.class)
995                 return 0;
996
997         i = to_fc_internal(shost->transportt);
998
999         return &i->t.target_attrs.ac == cont;
1000 }
1001
1002 static void fc_rport_dev_release(struct device *dev)
1003 {
1004         struct fc_rport *rport = dev_to_rport(dev);
1005         put_device(dev->parent);
1006         kfree(rport);
1007 }
1008
1009 int scsi_is_fc_rport(const struct device *dev)
1010 {
1011         return dev->release == fc_rport_dev_release;
1012 }
1013 EXPORT_SYMBOL(scsi_is_fc_rport);
1014
1015 static int fc_rport_match(struct attribute_container *cont,
1016                             struct device *dev)
1017 {
1018         struct Scsi_Host *shost;
1019         struct fc_internal *i;
1020
1021         if (!scsi_is_fc_rport(dev))
1022                 return 0;
1023
1024         shost = dev_to_shost(dev->parent);
1025         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1026             != &fc_host_class.class)
1027                 return 0;
1028
1029         i = to_fc_internal(shost->transportt);
1030
1031         return &i->rport_attr_cont.ac == cont;
1032 }
1033
1034
1035 /*
1036  * Must be called with shost->host_lock held
1037  */
1038 static struct device *fc_target_parent(struct Scsi_Host *shost,
1039                                         int channel, uint id)
1040 {
1041         struct fc_rport *rport;
1042
1043         list_for_each_entry(rport, &fc_host_rports(shost), peers)
1044                 if ((rport->channel == channel) &&
1045                     (rport->scsi_target_id == id))
1046                         return &rport->dev;
1047
1048         return NULL;
1049 }
1050
1051 struct scsi_transport_template *
1052 fc_attach_transport(struct fc_function_template *ft)
1053 {
1054         struct fc_internal *i = kmalloc(sizeof(struct fc_internal),
1055                                         GFP_KERNEL);
1056         int count;
1057
1058         if (unlikely(!i))
1059                 return NULL;
1060
1061         memset(i, 0, sizeof(struct fc_internal));
1062
1063         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
1064         i->t.target_attrs.ac.class = &fc_transport_class.class;
1065         i->t.target_attrs.ac.match = fc_target_match;
1066         i->t.target_size = sizeof(struct fc_starget_attrs);
1067         transport_container_register(&i->t.target_attrs);
1068
1069         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1070         i->t.host_attrs.ac.class = &fc_host_class.class;
1071         i->t.host_attrs.ac.match = fc_host_match;
1072         i->t.host_size = sizeof(struct fc_host_attrs);
1073         if (ft->get_fc_host_stats)
1074                 i->t.host_attrs.statistics = &fc_statistics_group;
1075         transport_container_register(&i->t.host_attrs);
1076
1077         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
1078         i->rport_attr_cont.ac.class = &fc_rport_class.class;
1079         i->rport_attr_cont.ac.match = fc_rport_match;
1080         transport_container_register(&i->rport_attr_cont);
1081
1082         i->f = ft;
1083
1084         /* Transport uses the shost workq for scsi scanning */
1085         i->t.create_work_queue = 1;
1086
1087         i->t.target_parent = fc_target_parent;
1088         
1089         /*
1090          * Setup SCSI Target Attributes.
1091          */
1092         count = 0;
1093         SETUP_STARGET_ATTRIBUTE_RD(node_name);
1094         SETUP_STARGET_ATTRIBUTE_RD(port_name);
1095         SETUP_STARGET_ATTRIBUTE_RD(port_id);
1096
1097         BUG_ON(count > FC_STARGET_NUM_ATTRS);
1098
1099         i->starget_attrs[count] = NULL;
1100
1101
1102         /*
1103          * Setup SCSI Host Attributes.
1104          */
1105         count=0;
1106         SETUP_HOST_ATTRIBUTE_RD(node_name);
1107         SETUP_HOST_ATTRIBUTE_RD(port_name);
1108         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
1109         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
1110         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
1111         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
1112         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
1113         SETUP_HOST_ATTRIBUTE_RD(serial_number);
1114
1115         SETUP_HOST_ATTRIBUTE_RD(port_id);
1116         SETUP_HOST_ATTRIBUTE_RD(port_type);
1117         SETUP_HOST_ATTRIBUTE_RD(port_state);
1118         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
1119         SETUP_HOST_ATTRIBUTE_RD(speed);
1120         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
1121
1122         /* Transport-managed attributes */
1123         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
1124
1125         BUG_ON(count > FC_HOST_NUM_ATTRS);
1126
1127         i->host_attrs[count] = NULL;
1128
1129         /*
1130          * Setup Remote Port Attributes.
1131          */
1132         count=0;
1133         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
1134         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
1135         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
1136         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
1137         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
1138         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
1139         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
1140         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
1141         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
1142
1143         BUG_ON(count > FC_RPORT_NUM_ATTRS);
1144
1145         i->rport_attrs[count] = NULL;
1146
1147         return &i->t;
1148 }
1149 EXPORT_SYMBOL(fc_attach_transport);
1150
1151 void fc_release_transport(struct scsi_transport_template *t)
1152 {
1153         struct fc_internal *i = to_fc_internal(t);
1154
1155         transport_container_unregister(&i->t.target_attrs);
1156         transport_container_unregister(&i->t.host_attrs);
1157         transport_container_unregister(&i->rport_attr_cont);
1158
1159         kfree(i);
1160 }
1161 EXPORT_SYMBOL(fc_release_transport);
1162
1163
1164 /**
1165  * fc_remove_host - called to terminate any fc_transport-related elements
1166  *                  for a scsi host.
1167  * @rport:      remote port to be unblocked.
1168  *
1169  * This routine is expected to be called immediately preceeding the
1170  * a driver's call to scsi_remove_host().
1171  *
1172  * WARNING: A driver utilizing the fc_transport, which fails to call
1173  *   this routine prior to scsi_remote_host(), will leave dangling
1174  *   objects in /sys/class/fc_remote_ports. Access to any of these
1175  *   objects can result in a system crash !!!
1176  *
1177  * Notes:
1178  *      This routine assumes no locks are held on entry.
1179  **/
1180 void
1181 fc_remove_host(struct Scsi_Host *shost)
1182 {
1183         struct fc_rport *rport, *next_rport;
1184
1185         /* Remove any remote ports */
1186         list_for_each_entry_safe(rport, next_rport,
1187                         &fc_host_rports(shost), peers)
1188                 fc_rport_terminate(rport);
1189         list_for_each_entry_safe(rport, next_rport,
1190                         &fc_host_rport_bindings(shost), peers)
1191                 fc_rport_terminate(rport);
1192 }
1193 EXPORT_SYMBOL(fc_remove_host);
1194
1195 /**
1196  * fc_rport_create - allocates and creates a remote FC port.
1197  * @shost:      scsi host the remote port is connected to.
1198  * @channel:    Channel on shost port connected to.
1199  * @ids:        The world wide names, fc address, and FC4 port
1200  *              roles for the remote port.
1201  *
1202  * Allocates and creates the remoter port structure, including the
1203  * class and sysfs creation.
1204  *
1205  * Notes:
1206  *      This routine assumes no locks are held on entry.
1207  **/
1208 struct fc_rport *
1209 fc_rport_create(struct Scsi_Host *shost, int channel,
1210         struct fc_rport_identifiers  *ids)
1211 {
1212         struct fc_host_attrs *fc_host =
1213                         (struct fc_host_attrs *)shost->shost_data;
1214         struct fc_internal *fci = to_fc_internal(shost->transportt);
1215         struct fc_rport *rport;
1216         struct device *dev;
1217         unsigned long flags;
1218         int error;
1219         size_t size;
1220
1221         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
1222         rport = kmalloc(size, GFP_KERNEL);
1223         if (unlikely(!rport)) {
1224                 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
1225                 return NULL;
1226         }
1227         memset(rport, 0, size);
1228
1229         rport->maxframe_size = -1;
1230         rport->supported_classes = FC_COS_UNSPECIFIED;
1231         rport->dev_loss_tmo = fc_dev_loss_tmo;
1232         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
1233         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
1234         rport->port_id = ids->port_id;
1235         rport->roles = ids->roles;
1236         rport->port_state = FC_PORTSTATE_ONLINE;
1237         if (fci->f->dd_fcrport_size)
1238                 rport->dd_data = &rport[1];
1239         rport->channel = channel;
1240
1241         INIT_WORK(&rport->dev_loss_work, fc_timeout_blocked_rport, rport);
1242         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport, rport);
1243
1244         spin_lock_irqsave(shost->host_lock, flags);
1245
1246         rport->number = fc_host->next_rport_number++;
1247         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1248                 rport->scsi_target_id = fc_host->next_target_id++;
1249         else
1250                 rport->scsi_target_id = -1;
1251         list_add_tail(&rport->peers, &fc_host_rports(shost));
1252         get_device(&shost->shost_gendev);
1253
1254         spin_unlock_irqrestore(shost->host_lock, flags);
1255
1256         dev = &rport->dev;
1257         device_initialize(dev);
1258         dev->parent = get_device(&shost->shost_gendev);
1259         dev->release = fc_rport_dev_release;
1260         sprintf(dev->bus_id, "rport-%d:%d-%d",
1261                 shost->host_no, channel, rport->number);
1262         transport_setup_device(dev);
1263
1264         error = device_add(dev);
1265         if (error) {
1266                 printk(KERN_ERR "FC Remote Port device_add failed\n");
1267                 goto delete_rport;
1268         }
1269         transport_add_device(dev);
1270         transport_configure_device(dev);
1271
1272         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1273                 /* initiate a scan of the target */
1274                 scsi_queue_work(shost, &rport->scan_work);
1275
1276         return rport;
1277
1278 delete_rport:
1279         transport_destroy_device(dev);
1280         put_device(dev->parent);
1281         spin_lock_irqsave(shost->host_lock, flags);
1282         list_del(&rport->peers);
1283         put_device(&shost->shost_gendev);
1284         spin_unlock_irqrestore(shost->host_lock, flags);
1285         put_device(dev->parent);
1286         kfree(rport);
1287         return NULL;
1288 }
1289
1290 /**
1291  * fc_remote_port_add - notifies the fc transport of the existence
1292  *              of a remote FC port.
1293  * @shost:      scsi host the remote port is connected to.
1294  * @channel:    Channel on shost port connected to.
1295  * @ids:        The world wide names, fc address, and FC4 port
1296  *              roles for the remote port.
1297  *
1298  * The LLDD calls this routine to notify the transport of the existence
1299  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
1300  * of the port, it's FC address (port_id), and the FC4 roles that are
1301  * active for the port.
1302  *
1303  * For ports that are FCP targets (aka scsi targets), the FC transport
1304  * maintains consistent target id bindings on behalf of the LLDD.
1305  * A consistent target id binding is an assignment of a target id to
1306  * a remote port identifier, which persists while the scsi host is
1307  * attached. The remote port can disappear, then later reappear, and
1308  * it's target id assignment remains the same. This allows for shifts
1309  * in FC addressing (if binding by wwpn or wwnn) with no apparent
1310  * changes to the scsi subsystem which is based on scsi host number and
1311  * target id values.  Bindings are only valid during the attachment of
1312  * the scsi host. If the host detaches, then later re-attaches, target
1313  * id bindings may change.
1314  *
1315  * This routine is responsible for returning a remote port structure.
1316  * The routine will search the list of remote ports it maintains
1317  * internally on behalf of consistent target id mappings. If found, the
1318  * remote port structure will be reused. Otherwise, a new remote port
1319  * structure will be allocated.
1320  *
1321  * Whenever a remote port is allocated, a new fc_remote_port class
1322  * device is created.
1323  *
1324  * Should not be called from interrupt context.
1325  *
1326  * Notes:
1327  *      This routine assumes no locks are held on entry.
1328  **/
1329 struct fc_rport *
1330 fc_remote_port_add(struct Scsi_Host *shost, int channel,
1331         struct fc_rport_identifiers  *ids)
1332 {
1333         struct fc_rport *rport;
1334         unsigned long flags;
1335         int match = 0;
1336
1337         if (likely((ids->roles & FC_RPORT_ROLE_FCP_TARGET) &&
1338                 (fc_host_tgtid_bind_type(shost) != FC_TGTID_BIND_NONE))) {
1339
1340                 /* search for a matching consistent binding */
1341
1342                 spin_lock_irqsave(shost->host_lock, flags);
1343
1344                 list_for_each_entry(rport, &fc_host_rport_bindings(shost),
1345                                         peers) {
1346                         if (rport->channel != channel)
1347                                 continue;
1348
1349                         switch (fc_host_tgtid_bind_type(shost)) {
1350                         case FC_TGTID_BIND_BY_WWPN:
1351                                 if (rport->port_name == ids->port_name)
1352                                         match = 1;
1353                                 break;
1354                         case FC_TGTID_BIND_BY_WWNN:
1355                                 if (rport->node_name == ids->node_name)
1356                                         match = 1;
1357                                 break;
1358                         case FC_TGTID_BIND_BY_ID:
1359                                 if (rport->port_id == ids->port_id)
1360                                         match = 1;
1361                                 break;
1362                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
1363                                 break;
1364                         }
1365
1366                         if (match) {
1367                                 list_move_tail(&rport->peers,
1368                                         &fc_host_rports(shost));
1369                                 break;
1370                         }
1371                 }
1372
1373                 spin_unlock_irqrestore(shost->host_lock, flags);
1374
1375                 if (match) {
1376                         memcpy(&rport->node_name, &ids->node_name,
1377                                 sizeof(rport->node_name));
1378                         memcpy(&rport->port_name, &ids->port_name,
1379                                 sizeof(rport->port_name));
1380                         rport->port_id = ids->port_id;
1381                         rport->roles = ids->roles;
1382                         rport->port_state = FC_PORTSTATE_ONLINE;
1383
1384                         if (rport->roles & FC_RPORT_ROLE_FCP_TARGET)
1385                                 /* initiate a scan of the target */
1386                                 scsi_queue_work(shost, &rport->scan_work);
1387
1388                         return rport;
1389                 }
1390         }
1391
1392         /* No consistent binding found - create new remote port entry */
1393         rport = fc_rport_create(shost, channel, ids);
1394
1395         return rport;
1396 }
1397 EXPORT_SYMBOL(fc_remote_port_add);
1398
1399 /*
1400  * fc_rport_tgt_remove - Removes the scsi target on the remote port
1401  * @rport:      The remote port to be operated on
1402  */
1403 static void
1404 fc_rport_tgt_remove(struct fc_rport *rport)
1405 {
1406         struct Scsi_Host *shost = rport_to_shost(rport);
1407
1408         scsi_target_unblock(&rport->dev);
1409
1410         /* Stop anything on the workq */
1411         if (!cancel_delayed_work(&rport->dev_loss_work))
1412                 flush_scheduled_work();
1413         scsi_flush_work(shost);
1414
1415         scsi_remove_target(&rport->dev);
1416 }
1417
1418 /*
1419  * fc_rport_terminate - this routine tears down and deallocates a remote port.
1420  * @rport:      The remote port to be terminated
1421  *
1422  * Notes:
1423  *      This routine assumes no locks are held on entry.
1424  */
1425 static void
1426 fc_rport_terminate(struct fc_rport  *rport)
1427 {
1428         struct Scsi_Host *shost = rport_to_shost(rport);
1429         struct device *dev = &rport->dev;
1430         unsigned long flags;
1431
1432         fc_rport_tgt_remove(rport);
1433
1434         transport_remove_device(dev);
1435         device_del(dev);
1436         transport_destroy_device(dev);
1437         spin_lock_irqsave(shost->host_lock, flags);
1438         list_del(&rport->peers);
1439         spin_unlock_irqrestore(shost->host_lock, flags);
1440         put_device(&shost->shost_gendev);
1441 }
1442
1443 /**
1444  * fc_remote_port_delete - notifies the fc transport that a remote
1445  *              port is no longer in existence.
1446  * @rport:      The remote port that no longer exists
1447  *
1448  * The LLDD calls this routine to notify the transport that a remote
1449  * port is no longer part of the topology. Note: Although a port
1450  * may no longer be part of the topology, it may persist in the remote
1451  * ports displayed by the fc_host. This is done so that target id
1452  * mappings (managed via the remote port structures), are always visible
1453  * as long as the mapping is valid, regardless of port state,
1454  *
1455  * If the remote port is not an FCP Target, it will be fully torn down
1456  * and deallocated, including the fc_remote_port class device.
1457  *
1458  * If the remote port is an FCP Target, the port structure will be
1459  * marked as Not Present, but will remain as long as there is a valid
1460  * SCSI target id mapping associated with the port structure. Validity
1461  * is determined by the binding type. If binding by wwpn, then the port
1462  * structure is always valid and will not be deallocated until the host
1463  * is removed.  If binding by wwnn, then the port structure is valid
1464  * until another port with the same node name is found in the topology.
1465  * If binding by port id (fc address), then the port structure is valid
1466  * valid until another port with the same address is identified.
1467  *
1468  * Called from interrupt or normal process context.
1469  *
1470  * Notes:
1471  *      This routine assumes no locks are held on entry.
1472  **/
1473 void
1474 fc_remote_port_delete(struct fc_rport  *rport)
1475 {
1476         struct Scsi_Host *shost = rport_to_shost(rport);
1477         unsigned long flags;
1478
1479         /* If no scsi target id mapping or consistent binding type, delete it */
1480         if ((rport->scsi_target_id == -1) ||
1481             (fc_host_tgtid_bind_type(shost) == FC_TGTID_BIND_NONE)) {
1482                 fc_rport_terminate(rport);
1483                 return;
1484         }
1485
1486         fc_rport_tgt_remove(rport);
1487
1488         spin_lock_irqsave(shost->host_lock, flags);
1489         list_move_tail(&rport->peers, &fc_host_rport_bindings(shost));
1490         spin_unlock_irqrestore(shost->host_lock, flags);
1491
1492         /*
1493          * Note: We do not remove or clear the hostdata area. This allows
1494          *   host-specific target data to persist along with the
1495          *   scsi_target_id. It's up to the host to manage it's hostdata area.
1496          */
1497
1498         /*
1499          * Reinitialize port attributes that may change if the port comes back.
1500          */
1501         rport->maxframe_size = -1;
1502         rport->supported_classes = FC_COS_UNSPECIFIED;
1503         rport->roles = FC_RPORT_ROLE_UNKNOWN;
1504         rport->port_state = FC_PORTSTATE_NOTPRESENT;
1505
1506         /* remove the identifiers that aren't used in the consisting binding */
1507         switch (fc_host_tgtid_bind_type(shost)) {
1508         case FC_TGTID_BIND_BY_WWPN:
1509                 rport->node_name = -1;
1510                 rport->port_id = -1;
1511                 break;
1512         case FC_TGTID_BIND_BY_WWNN:
1513                 rport->port_name = -1;
1514                 rport->port_id = -1;
1515                 break;
1516         case FC_TGTID_BIND_BY_ID:
1517                 rport->node_name = -1;
1518                 rport->port_name = -1;
1519                 break;
1520         case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
1521                 break;
1522         }
1523 }
1524 EXPORT_SYMBOL(fc_remote_port_delete);
1525
1526 /**
1527  * fc_remote_port_rolechg - notifies the fc transport that the roles
1528  *              on a remote may have changed.
1529  * @rport:      The remote port that changed.
1530  *
1531  * The LLDD calls this routine to notify the transport that the roles
1532  * on a remote port may have changed. The largest effect of this is
1533  * if a port now becomes a FCP Target, it must be allocated a
1534  * scsi target id.  If the port is no longer a FCP target, any
1535  * scsi target id value assigned to it will persist in case the
1536  * role changes back to include FCP Target. No changes in the scsi
1537  * midlayer will be invoked if the role changes (in the expectation
1538  * that the role will be resumed. If it doesn't normal error processing
1539  * will take place).
1540  *
1541  * Should not be called from interrupt context.
1542  *
1543  * Notes:
1544  *      This routine assumes no locks are held on entry.
1545  **/
1546 void
1547 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
1548 {
1549         struct Scsi_Host *shost = rport_to_shost(rport);
1550         struct fc_host_attrs *fc_host =
1551                         (struct fc_host_attrs *)shost->shost_data;
1552         unsigned long flags;
1553         int create = 0;
1554
1555         rport->roles = roles;
1556
1557         spin_lock_irqsave(shost->host_lock, flags);
1558         if ((rport->scsi_target_id == -1) &&
1559             (rport->roles & FC_RPORT_ROLE_FCP_TARGET)) {
1560                 rport->scsi_target_id = fc_host->next_target_id++;
1561                 create = 1;
1562         }
1563         spin_unlock_irqrestore(shost->host_lock, flags);
1564
1565         if (create)
1566                 /* initiate a scan of the target */
1567                 scsi_queue_work(shost, &rport->scan_work);
1568 }
1569 EXPORT_SYMBOL(fc_remote_port_rolechg);
1570
1571 /**
1572  * fc_timeout_blocked_rport - Timeout handler for blocked remote port
1573  *                       that fails to return in the alloted time.
1574  * @data:       scsi target that failed to reappear in the alloted time.
1575  **/
1576 static void
1577 fc_timeout_blocked_rport(void  *data)
1578 {
1579         struct fc_rport *rport = (struct fc_rport *)data;
1580
1581         rport->port_state = FC_PORTSTATE_OFFLINE;
1582
1583         dev_printk(KERN_ERR, &rport->dev,
1584                 "blocked FC remote port time out: removing target\n");
1585
1586         /*
1587          * As this only occurs if the remote port (scsi target)
1588          * went away and didn't come back - we'll remove
1589          * all attached scsi devices.
1590          */
1591         scsi_target_unblock(&rport->dev);
1592         scsi_remove_target(&rport->dev);
1593 }
1594
1595 /**
1596  * fc_remote_port_block - temporarily block any scsi traffic to a remote port.
1597  * @rport:      remote port to be blocked.
1598  *
1599  * scsi lldd's with a FC transport call this routine to temporarily stop
1600  * all scsi traffic to a remote port. If the port is not a SCSI target,
1601  * no action is taken. If the port is a SCSI target, all attached devices
1602  * are placed into a SDEV_BLOCK state and a timer is started. The timer is
1603  * represents the maximum amount of time the port may be blocked. If the
1604  * timer expires, the port is considered non-existent and the attached
1605  * scsi devices will be removed.
1606  *
1607  * Called from interrupt or normal process context.
1608  *
1609  * Returns zero if successful or error if not
1610  *
1611  * Notes:
1612  *      This routine assumes no locks are held on entry.
1613  *
1614  *      The timeout and timer types are extracted from the fc transport 
1615  *      attributes from the caller's rport pointer.
1616  **/
1617 int
1618 fc_remote_port_block(struct fc_rport *rport)
1619 {
1620         int timeout = rport->dev_loss_tmo;
1621         struct work_struct *work = &rport->dev_loss_work;
1622
1623         if (timeout < 0 || timeout > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1624                 return -EINVAL;
1625
1626         scsi_target_block(&rport->dev);
1627
1628         /* cap the length the devices can be blocked */
1629         schedule_delayed_work(work, timeout * HZ);
1630
1631         rport->port_state = FC_PORTSTATE_BLOCKED;
1632         return 0;
1633 }
1634 EXPORT_SYMBOL(fc_remote_port_block);
1635
1636 /**
1637  * fc_remote_port_unblock - restart any blocked scsi traffic to a remote port.
1638  * @rport:      remote port to be unblocked.
1639  *
1640  * scsi lld's with a FC transport call this routine to restart IO to all
1641  * devices associated with the caller's scsi target following a fc_target_block
1642  * request.  Called from interrupt or normal process context.
1643  *
1644  * Notes:
1645  *      This routine assumes no locks are held on entry.
1646  **/
1647  void
1648 fc_remote_port_unblock(struct fc_rport *rport)
1649 {
1650         struct work_struct *work = &rport->dev_loss_work;
1651         struct Scsi_Host *shost = rport_to_shost(rport);
1652
1653         /*
1654          * Stop the target timer first. Take no action on the del_timer
1655          * failure as the state machine state change will validate the
1656          * transaction.
1657          */
1658         if (!cancel_delayed_work(work))
1659                 flush_scheduled_work();
1660
1661         if (rport->port_state == FC_PORTSTATE_OFFLINE)
1662                 /*
1663                  * initiate a scan of the target as the target has
1664                  * been torn down.
1665                  */
1666                 scsi_queue_work(shost, &rport->scan_work);
1667         else
1668                 scsi_target_unblock(&rport->dev);
1669
1670         rport->port_state = FC_PORTSTATE_ONLINE;
1671 }
1672 EXPORT_SYMBOL(fc_remote_port_unblock);
1673
1674 /**
1675  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
1676  * @data:       remote port to be scanned.
1677  **/
1678 static void
1679 fc_scsi_scan_rport(void *data)
1680 {
1681         struct fc_rport *rport = (struct fc_rport *)data;
1682
1683         scsi_scan_target(&rport->dev, rport->channel, rport->scsi_target_id,
1684                         SCAN_WILD_CARD, 1);
1685 }
1686
1687
1688 MODULE_AUTHOR("Martin Hicks");
1689 MODULE_DESCRIPTION("FC Transport Attributes");
1690 MODULE_LICENSE("GPL");
1691
1692 module_init(fc_transport_init);
1693 module_exit(fc_transport_exit);