Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
[linux-2.6.git] / drivers / firmware / iscsi_ibft.c
1 /*
2  *  Copyright 2007 Red Hat, Inc.
3  *  by Peter Jones <pjones@redhat.com>
4  *  Copyright 2008 IBM, Inc.
5  *  by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
6  *  Copyright 2008
7  *  by Konrad Rzeszutek <ketuzsezr@darnok.org>
8  *
9  * This code exposes the iSCSI Boot Format Table to userland via sysfs.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License v2.0 as published by
13  * the Free Software Foundation
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * Changelog:
21  *
22  *  14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
23  *    Updated comments and copyrights. (v0.4.9)
24  *
25  *  11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
26  *    Converted to using ibft_addr. (v0.4.8)
27  *
28  *   8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
29  *    Combined two functions in one: reserve_ibft_region. (v0.4.7)
30  *
31  *  30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
32  *   Added logic to handle IPv6 addresses. (v0.4.6)
33  *
34  *  25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
35  *   Added logic to handle badly not-to-spec iBFT. (v0.4.5)
36  *
37  *   4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
38  *   Added __init to function declarations. (v0.4.4)
39  *
40  *  21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
41  *   Updated kobject registration, combined unregister functions in one
42  *   and code and style cleanup. (v0.4.3)
43  *
44  *   5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
45  *   Added end-markers to enums and re-organized kobject registration. (v0.4.2)
46  *
47  *   4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
48  *   Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
49  *
50  *  28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
51  *   Added sysfs-ibft documentation, moved 'find_ibft' function to
52  *   in its own file and added text attributes for every struct field.  (v0.4)
53  *
54  *  21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
55  *   Added text attributes emulating OpenFirmware /proc/device-tree naming.
56  *   Removed binary /sysfs interface (v0.3)
57  *
58  *  29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
59  *   Added functionality in setup.c to reserve iBFT region. (v0.2)
60  *
61  *  27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
62  *   First version exposing iBFT data via a binary /sysfs. (v0.1)
63  *
64  */
65
66
67 #include <linux/blkdev.h>
68 #include <linux/capability.h>
69 #include <linux/ctype.h>
70 #include <linux/device.h>
71 #include <linux/err.h>
72 #include <linux/init.h>
73 #include <linux/iscsi_ibft.h>
74 #include <linux/limits.h>
75 #include <linux/module.h>
76 #include <linux/pci.h>
77 #include <linux/slab.h>
78 #include <linux/stat.h>
79 #include <linux/string.h>
80 #include <linux/types.h>
81
82 #define IBFT_ISCSI_VERSION "0.4.9"
83 #define IBFT_ISCSI_DATE "2008-Mar-14"
84
85 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and \
86 Konrad Rzeszutek <ketuzsezr@darnok.org>");
87 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
88 MODULE_LICENSE("GPL");
89 MODULE_VERSION(IBFT_ISCSI_VERSION);
90
91 struct ibft_hdr {
92         u8 id;
93         u8 version;
94         u16 length;
95         u8 index;
96         u8 flags;
97 } __attribute__((__packed__));
98
99 struct ibft_control {
100         struct ibft_hdr hdr;
101         u16 extensions;
102         u16 initiator_off;
103         u16 nic0_off;
104         u16 tgt0_off;
105         u16 nic1_off;
106         u16 tgt1_off;
107 } __attribute__((__packed__));
108
109 struct ibft_initiator {
110         struct ibft_hdr hdr;
111         char isns_server[16];
112         char slp_server[16];
113         char pri_radius_server[16];
114         char sec_radius_server[16];
115         u16 initiator_name_len;
116         u16 initiator_name_off;
117 } __attribute__((__packed__));
118
119 struct ibft_nic {
120         struct ibft_hdr hdr;
121         char ip_addr[16];
122         u8 subnet_mask_prefix;
123         u8 origin;
124         char gateway[16];
125         char primary_dns[16];
126         char secondary_dns[16];
127         char dhcp[16];
128         u16 vlan;
129         char mac[6];
130         u16 pci_bdf;
131         u16 hostname_len;
132         u16 hostname_off;
133 } __attribute__((__packed__));
134
135 struct ibft_tgt {
136         struct ibft_hdr hdr;
137         char ip_addr[16];
138         u16 port;
139         char lun[8];
140         u8 chap_type;
141         u8 nic_assoc;
142         u16 tgt_name_len;
143         u16 tgt_name_off;
144         u16 chap_name_len;
145         u16 chap_name_off;
146         u16 chap_secret_len;
147         u16 chap_secret_off;
148         u16 rev_chap_name_len;
149         u16 rev_chap_name_off;
150         u16 rev_chap_secret_len;
151         u16 rev_chap_secret_off;
152 } __attribute__((__packed__));
153
154 /*
155  * The kobject different types and its names.
156  *
157 */
158 enum ibft_id {
159         id_reserved = 0, /* We don't support. */
160         id_control = 1, /* Should show up only once and is not exported. */
161         id_initiator = 2,
162         id_nic = 3,
163         id_target = 4,
164         id_extensions = 5, /* We don't support. */
165         id_end_marker,
166 };
167
168 /*
169  * We do not support the other types, hence the usage of NULL.
170  * This maps to the enum ibft_id.
171  */
172 static const char *ibft_id_names[] =
173         {NULL, NULL, "initiator", "ethernet%d", "target%d", NULL, NULL};
174
175 /*
176  * The text attributes names for each of the kobjects.
177 */
178 enum ibft_eth_properties_enum {
179         ibft_eth_index,
180         ibft_eth_flags,
181         ibft_eth_ip_addr,
182         ibft_eth_subnet_mask,
183         ibft_eth_origin,
184         ibft_eth_gateway,
185         ibft_eth_primary_dns,
186         ibft_eth_secondary_dns,
187         ibft_eth_dhcp,
188         ibft_eth_vlan,
189         ibft_eth_mac,
190         /* ibft_eth_pci_bdf - this is replaced by link to the device itself. */
191         ibft_eth_hostname,
192         ibft_eth_end_marker,
193 };
194
195 static const char *ibft_eth_properties[] =
196         {"index", "flags", "ip-addr", "subnet-mask", "origin", "gateway",
197         "primary-dns", "secondary-dns", "dhcp", "vlan", "mac", "hostname",
198         NULL};
199
200 enum ibft_tgt_properties_enum {
201         ibft_tgt_index,
202         ibft_tgt_flags,
203         ibft_tgt_ip_addr,
204         ibft_tgt_port,
205         ibft_tgt_lun,
206         ibft_tgt_chap_type,
207         ibft_tgt_nic_assoc,
208         ibft_tgt_name,
209         ibft_tgt_chap_name,
210         ibft_tgt_chap_secret,
211         ibft_tgt_rev_chap_name,
212         ibft_tgt_rev_chap_secret,
213         ibft_tgt_end_marker,
214 };
215
216 static const char *ibft_tgt_properties[] =
217         {"index", "flags", "ip-addr", "port", "lun", "chap-type", "nic-assoc",
218         "target-name", "chap-name", "chap-secret", "rev-chap-name",
219         "rev-chap-name-secret", NULL};
220
221 enum ibft_initiator_properties_enum {
222         ibft_init_index,
223         ibft_init_flags,
224         ibft_init_isns_server,
225         ibft_init_slp_server,
226         ibft_init_pri_radius_server,
227         ibft_init_sec_radius_server,
228         ibft_init_initiator_name,
229         ibft_init_end_marker,
230 };
231
232 static const char *ibft_initiator_properties[] =
233         {"index", "flags", "isns-server", "slp-server", "pri-radius-server",
234         "sec-radius-server", "initiator-name", NULL};
235
236 /*
237  * The kobject and attribute structures.
238  */
239
240 struct ibft_kobject {
241         struct ibft_table_header *header;
242         union {
243                 struct ibft_initiator *initiator;
244                 struct ibft_nic *nic;
245                 struct ibft_tgt *tgt;
246                 struct ibft_hdr *hdr;
247         };
248         struct kobject kobj;
249         struct list_head node;
250 };
251
252 struct ibft_attribute {
253         struct attribute attr;
254         ssize_t (*show) (struct  ibft_kobject *entry,
255                          struct ibft_attribute *attr, char *buf);
256         union {
257                 struct ibft_initiator *initiator;
258                 struct ibft_nic *nic;
259                 struct ibft_tgt *tgt;
260                 struct ibft_hdr *hdr;
261         };
262         struct kobject *kobj;
263         int type; /* The enum of the type. This can be any value of:
264                 ibft_eth_properties_enum, ibft_tgt_properties_enum,
265                 or ibft_initiator_properties_enum. */
266         struct list_head node;
267 };
268
269 static LIST_HEAD(ibft_attr_list);
270 static LIST_HEAD(ibft_kobject_list);
271
272 static const char nulls[16];
273
274 /*
275  * Helper functions to parse data properly.
276  */
277 static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
278 {
279         char *str = buf;
280
281         if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
282             ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
283             ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
284                 /*
285                  * IPV4
286                  */
287                 str += sprintf(buf, "%pI4", ip + 12);
288         } else {
289                 /*
290                  * IPv6
291                  */
292                 str += sprintf(str, "%pI6", ip);
293         }
294         str += sprintf(str, "\n");
295         return str - buf;
296 }
297
298 static ssize_t sprintf_string(char *str, int len, char *buf)
299 {
300         return sprintf(str, "%.*s\n", len, buf);
301 }
302
303 /*
304  * Helper function to verify the IBFT header.
305  */
306 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
307 {
308         if (hdr->id != id) {
309                 printk(KERN_ERR "iBFT error: We expected the " \
310                                 "field header.id to have %d but " \
311                                 "found %d instead!\n", id, hdr->id);
312                 return -ENODEV;
313         }
314         if (hdr->length != length) {
315                 printk(KERN_ERR "iBFT error: We expected the " \
316                                 "field header.length to have %d but " \
317                                 "found %d instead!\n", length, hdr->length);
318                 return -ENODEV;
319         }
320
321         return 0;
322 }
323
324 static void ibft_release(struct kobject *kobj)
325 {
326         struct ibft_kobject *ibft =
327                 container_of(kobj, struct ibft_kobject, kobj);
328         kfree(ibft);
329 }
330
331 /*
332  *  Routines for parsing the iBFT data to be human readable.
333  */
334 static ssize_t ibft_attr_show_initiator(struct ibft_kobject *entry,
335                                         struct ibft_attribute *attr,
336                                         char *buf)
337 {
338         struct ibft_initiator *initiator = entry->initiator;
339         void *ibft_loc = entry->header;
340         char *str = buf;
341
342         if (!initiator)
343                 return 0;
344
345         switch (attr->type) {
346         case ibft_init_index:
347                 str += sprintf(str, "%d\n", initiator->hdr.index);
348                 break;
349         case ibft_init_flags:
350                 str += sprintf(str, "%d\n", initiator->hdr.flags);
351                 break;
352         case ibft_init_isns_server:
353                 str += sprintf_ipaddr(str, initiator->isns_server);
354                 break;
355         case ibft_init_slp_server:
356                 str += sprintf_ipaddr(str, initiator->slp_server);
357                 break;
358         case ibft_init_pri_radius_server:
359                 str += sprintf_ipaddr(str, initiator->pri_radius_server);
360                 break;
361         case ibft_init_sec_radius_server:
362                 str += sprintf_ipaddr(str, initiator->sec_radius_server);
363                 break;
364         case ibft_init_initiator_name:
365                 str += sprintf_string(str, initiator->initiator_name_len,
366                                       (char *)ibft_loc +
367                                       initiator->initiator_name_off);
368                 break;
369         default:
370                 break;
371         }
372
373         return str - buf;
374 }
375
376 static ssize_t ibft_attr_show_nic(struct ibft_kobject *entry,
377                                   struct ibft_attribute *attr,
378                                   char *buf)
379 {
380         struct ibft_nic *nic = entry->nic;
381         void *ibft_loc = entry->header;
382         char *str = buf;
383         __be32 val;
384
385         if (!nic)
386                 return 0;
387
388         switch (attr->type) {
389         case ibft_eth_index:
390                 str += sprintf(str, "%d\n", nic->hdr.index);
391                 break;
392         case ibft_eth_flags:
393                 str += sprintf(str, "%d\n", nic->hdr.flags);
394                 break;
395         case ibft_eth_ip_addr:
396                 str += sprintf_ipaddr(str, nic->ip_addr);
397                 break;
398         case ibft_eth_subnet_mask:
399                 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
400                 str += sprintf(str, "%pI4", &val);
401                 break;
402         case ibft_eth_origin:
403                 str += sprintf(str, "%d\n", nic->origin);
404                 break;
405         case ibft_eth_gateway:
406                 str += sprintf_ipaddr(str, nic->gateway);
407                 break;
408         case ibft_eth_primary_dns:
409                 str += sprintf_ipaddr(str, nic->primary_dns);
410                 break;
411         case ibft_eth_secondary_dns:
412                 str += sprintf_ipaddr(str, nic->secondary_dns);
413                 break;
414         case ibft_eth_dhcp:
415                 str += sprintf_ipaddr(str, nic->dhcp);
416                 break;
417         case ibft_eth_vlan:
418                 str += sprintf(str, "%d\n", nic->vlan);
419                 break;
420         case ibft_eth_mac:
421                 str += sprintf(str, "%pM\n", nic->mac);
422                 break;
423         case ibft_eth_hostname:
424                 str += sprintf_string(str, nic->hostname_len,
425                                       (char *)ibft_loc + nic->hostname_off);
426                 break;
427         default:
428                 break;
429         }
430
431         return str - buf;
432 };
433
434 static ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
435                                      struct ibft_attribute *attr,
436                                      char *buf)
437 {
438         struct ibft_tgt *tgt = entry->tgt;
439         void *ibft_loc = entry->header;
440         char *str = buf;
441         int i;
442
443         if (!tgt)
444                 return 0;
445
446         switch (attr->type) {
447         case ibft_tgt_index:
448                 str += sprintf(str, "%d\n", tgt->hdr.index);
449                 break;
450         case ibft_tgt_flags:
451                 str += sprintf(str, "%d\n", tgt->hdr.flags);
452                 break;
453         case ibft_tgt_ip_addr:
454                 str += sprintf_ipaddr(str, tgt->ip_addr);
455                 break;
456         case ibft_tgt_port:
457                 str += sprintf(str, "%d\n", tgt->port);
458                 break;
459         case ibft_tgt_lun:
460                 for (i = 0; i < 8; i++)
461                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
462                 str += sprintf(str, "\n");
463                 break;
464         case ibft_tgt_nic_assoc:
465                 str += sprintf(str, "%d\n", tgt->nic_assoc);
466                 break;
467         case ibft_tgt_chap_type:
468                 str += sprintf(str, "%d\n", tgt->chap_type);
469                 break;
470         case ibft_tgt_name:
471                 str += sprintf_string(str, tgt->tgt_name_len,
472                                       (char *)ibft_loc + tgt->tgt_name_off);
473                 break;
474         case ibft_tgt_chap_name:
475                 str += sprintf_string(str, tgt->chap_name_len,
476                                       (char *)ibft_loc + tgt->chap_name_off);
477                 break;
478         case ibft_tgt_chap_secret:
479                 str += sprintf_string(str, tgt->chap_secret_len,
480                                       (char *)ibft_loc + tgt->chap_secret_off);
481                 break;
482         case ibft_tgt_rev_chap_name:
483                 str += sprintf_string(str, tgt->rev_chap_name_len,
484                                       (char *)ibft_loc +
485                                       tgt->rev_chap_name_off);
486                 break;
487         case ibft_tgt_rev_chap_secret:
488                 str += sprintf_string(str, tgt->rev_chap_secret_len,
489                                       (char *)ibft_loc +
490                                       tgt->rev_chap_secret_off);
491                 break;
492         default:
493                 break;
494         }
495
496         return str - buf;
497 }
498
499 /*
500  * The routine called for all sysfs attributes.
501  */
502 static ssize_t ibft_show_attribute(struct kobject *kobj,
503                                     struct attribute *attr,
504                                     char *buf)
505 {
506         struct ibft_kobject *dev =
507                 container_of(kobj, struct ibft_kobject, kobj);
508         struct ibft_attribute *ibft_attr =
509                 container_of(attr, struct ibft_attribute, attr);
510         ssize_t ret = -EIO;
511         char *str = buf;
512
513         if (!capable(CAP_SYS_ADMIN))
514                 return -EACCES;
515
516         if (ibft_attr->show)
517                 ret = ibft_attr->show(dev, ibft_attr, str);
518
519         return ret;
520 }
521
522 static struct sysfs_ops ibft_attr_ops = {
523         .show = ibft_show_attribute,
524 };
525
526 static struct kobj_type ibft_ktype = {
527         .release = ibft_release,
528         .sysfs_ops = &ibft_attr_ops,
529 };
530
531 static struct kset *ibft_kset;
532
533 static int __init ibft_check_device(void)
534 {
535         int len;
536         u8 *pos;
537         u8 csum = 0;
538
539         len = ibft_addr->length;
540
541         /* Sanity checking of iBFT. */
542         if (ibft_addr->revision != 1) {
543                 printk(KERN_ERR "iBFT module supports only revision 1, " \
544                                 "while this is %d.\n", ibft_addr->revision);
545                 return -ENOENT;
546         }
547         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
548                 csum += *pos;
549
550         if (csum) {
551                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
552                 return -ENOENT;
553         }
554
555         return 0;
556 }
557
558 /*
559  * Helper function for ibft_register_kobjects.
560  */
561 static int __init ibft_create_kobject(struct ibft_table_header *header,
562                                        struct ibft_hdr *hdr,
563                                        struct list_head *list)
564 {
565         struct ibft_kobject *ibft_kobj = NULL;
566         struct ibft_nic *nic = (struct ibft_nic *)hdr;
567         struct pci_dev *pci_dev;
568         int rc = 0;
569
570         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
571         if (!ibft_kobj)
572                 return -ENOMEM;
573
574         ibft_kobj->header = header;
575         ibft_kobj->hdr = hdr;
576
577         switch (hdr->id) {
578         case id_initiator:
579                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
580                                      sizeof(*ibft_kobj->initiator));
581                 break;
582         case id_nic:
583                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
584                                      sizeof(*ibft_kobj->nic));
585                 break;
586         case id_target:
587                 rc = ibft_verify_hdr("target", hdr, id_target,
588                                      sizeof(*ibft_kobj->tgt));
589                 break;
590         case id_reserved:
591         case id_control:
592         case id_extensions:
593                 /* Fields which we don't support. Ignore them */
594                 rc = 1;
595                 break;
596         default:
597                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
598                                 "Report this bug to %.6s!\n", hdr->id,
599                                 header->oem_id);
600                 rc = 1;
601                 break;
602         }
603
604         if (rc) {
605                 /* Skip adding this kobject, but exit with non-fatal error. */
606                 kfree(ibft_kobj);
607                 goto out_invalid_struct;
608         }
609
610         ibft_kobj->kobj.kset = ibft_kset;
611
612         rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
613                                   NULL, ibft_id_names[hdr->id], hdr->index);
614
615         if (rc) {
616                 kfree(ibft_kobj);
617                 goto out;
618         }
619
620         kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
621
622         if (hdr->id == id_nic) {
623                 /*
624                 * We don't search for the device in other domains than
625                 * zero. This is because on x86 platforms the BIOS
626                 * executes only devices which are in domain 0. Furthermore, the
627                 * iBFT spec doesn't have a domain id field :-(
628                 */
629                 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
630                                                (nic->pci_bdf & 0xff));
631                 if (pci_dev) {
632                         rc = sysfs_create_link(&ibft_kobj->kobj,
633                                                &pci_dev->dev.kobj, "device");
634                         pci_dev_put(pci_dev);
635                 }
636         }
637
638         /* Nothing broke so lets add it to the list. */
639         list_add_tail(&ibft_kobj->node, list);
640 out:
641         return rc;
642 out_invalid_struct:
643         /* Unsupported structs are skipped. */
644         return 0;
645 }
646
647 /*
648  * Scan the IBFT table structure for the NIC and Target fields. When
649  * found add them on the passed-in list. We do not support the other
650  * fields at this point, so they are skipped.
651  */
652 static int __init ibft_register_kobjects(struct ibft_table_header *header,
653                                           struct list_head *list)
654 {
655         struct ibft_control *control = NULL;
656         void *ptr, *end;
657         int rc = 0;
658         u16 offset;
659         u16 eot_offset;
660
661         control = (void *)header + sizeof(*header);
662         end = (void *)control + control->hdr.length;
663         eot_offset = (void *)header + header->length - (void *)control;
664         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
665                              sizeof(*control));
666
667         /* iBFT table safety checking */
668         rc |= ((control->hdr.index) ? -ENODEV : 0);
669         if (rc) {
670                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
671                 return rc;
672         }
673         for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
674                 offset = *(u16 *)ptr;
675                 if (offset && offset < header->length && offset < eot_offset) {
676                         rc = ibft_create_kobject(header,
677                                                  (void *)header + offset,
678                                                  list);
679                         if (rc)
680                                 break;
681                 }
682         }
683
684         return rc;
685 }
686
687 static void ibft_unregister(struct list_head *attr_list,
688                              struct list_head *kobj_list)
689 {
690         struct ibft_kobject *data = NULL, *n;
691         struct ibft_attribute *attr = NULL, *m;
692
693         list_for_each_entry_safe(attr, m, attr_list, node) {
694                 sysfs_remove_file(attr->kobj, &attr->attr);
695                 list_del(&attr->node);
696                 kfree(attr);
697         };
698         list_del_init(attr_list);
699
700         list_for_each_entry_safe(data, n, kobj_list, node) {
701                 list_del(&data->node);
702                 if (data->hdr->id == id_nic)
703                         sysfs_remove_link(&data->kobj, "device");
704                 kobject_put(&data->kobj);
705         };
706         list_del_init(kobj_list);
707 }
708
709 static int __init ibft_create_attribute(struct ibft_kobject *kobj_data,
710                                          int type,
711                                          const char *name,
712                                          ssize_t (*show)(struct ibft_kobject *,
713                                                          struct ibft_attribute*,
714                                                          char *buf),
715                                          struct list_head *list)
716 {
717         struct ibft_attribute *attr = NULL;
718         struct ibft_hdr *hdr = kobj_data->hdr;
719
720         attr = kmalloc(sizeof(*attr), GFP_KERNEL);
721         if (!attr)
722                 return -ENOMEM;
723
724         attr->attr.name = name;
725         attr->attr.mode = S_IRUSR;
726
727         attr->hdr = hdr;
728         attr->show = show;
729         attr->kobj = &kobj_data->kobj;
730         attr->type = type;
731
732         list_add_tail(&attr->node, list);
733
734         return 0;
735 }
736
737 /*
738  * Helper routiners to check to determine if the entry is valid
739  * in the proper iBFT structure.
740  */
741 static int __init ibft_check_nic_for(struct ibft_nic *nic, int entry)
742 {
743         int rc = 0;
744
745         switch (entry) {
746         case ibft_eth_index:
747         case ibft_eth_flags:
748                 rc = 1;
749                 break;
750         case ibft_eth_ip_addr:
751                 if (memcmp(nic->ip_addr, nulls, sizeof(nic->ip_addr)))
752                         rc = 1;
753                 break;
754         case ibft_eth_subnet_mask:
755                 if (nic->subnet_mask_prefix)
756                         rc = 1;
757                 break;
758         case ibft_eth_origin:
759                 rc = 1;
760                 break;
761         case ibft_eth_gateway:
762                 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
763                         rc = 1;
764                 break;
765         case ibft_eth_primary_dns:
766                 if (memcmp(nic->primary_dns, nulls,
767                            sizeof(nic->primary_dns)))
768                         rc = 1;
769                 break;
770         case ibft_eth_secondary_dns:
771                 if (memcmp(nic->secondary_dns, nulls,
772                            sizeof(nic->secondary_dns)))
773                         rc = 1;
774                 break;
775         case ibft_eth_dhcp:
776                 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
777                         rc = 1;
778                 break;
779         case ibft_eth_vlan:
780         case ibft_eth_mac:
781                 rc = 1;
782                 break;
783         case ibft_eth_hostname:
784                 if (nic->hostname_off)
785                         rc = 1;
786                 break;
787         default:
788                 break;
789         }
790
791         return rc;
792 }
793
794 static int __init ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
795 {
796         int rc = 0;
797
798         switch (entry) {
799         case ibft_tgt_index:
800         case ibft_tgt_flags:
801         case ibft_tgt_ip_addr:
802         case ibft_tgt_port:
803         case ibft_tgt_lun:
804         case ibft_tgt_nic_assoc:
805         case ibft_tgt_chap_type:
806                 rc = 1;
807         case ibft_tgt_name:
808                 if (tgt->tgt_name_len)
809                         rc = 1;
810                 break;
811         case ibft_tgt_chap_name:
812         case ibft_tgt_chap_secret:
813                 if (tgt->chap_name_len)
814                         rc = 1;
815                 break;
816         case ibft_tgt_rev_chap_name:
817         case ibft_tgt_rev_chap_secret:
818                 if (tgt->rev_chap_name_len)
819                         rc = 1;
820                 break;
821         default:
822                 break;
823         }
824
825         return rc;
826 }
827
828 static int __init ibft_check_initiator_for(struct ibft_initiator *init,
829                                             int entry)
830 {
831         int rc = 0;
832
833         switch (entry) {
834         case ibft_init_index:
835         case ibft_init_flags:
836                 rc = 1;
837                 break;
838         case ibft_init_isns_server:
839                 if (memcmp(init->isns_server, nulls,
840                            sizeof(init->isns_server)))
841                         rc = 1;
842                 break;
843         case ibft_init_slp_server:
844                 if (memcmp(init->slp_server, nulls,
845                            sizeof(init->slp_server)))
846                         rc = 1;
847                 break;
848         case ibft_init_pri_radius_server:
849                 if (memcmp(init->pri_radius_server, nulls,
850                            sizeof(init->pri_radius_server)))
851                         rc = 1;
852                 break;
853         case ibft_init_sec_radius_server:
854                 if (memcmp(init->sec_radius_server, nulls,
855                            sizeof(init->sec_radius_server)))
856                         rc = 1;
857                 break;
858         case ibft_init_initiator_name:
859                 if (init->initiator_name_len)
860                         rc = 1;
861                 break;
862         default:
863                 break;
864         }
865
866         return rc;
867 }
868
869 /*
870  *  Register the attributes for all of the kobjects.
871  */
872 static int __init ibft_register_attributes(struct list_head *kobject_list,
873                                             struct list_head *attr_list)
874 {
875         int rc = 0, i = 0;
876         struct ibft_kobject *data = NULL;
877         struct ibft_attribute *attr = NULL, *m;
878
879         list_for_each_entry(data, kobject_list, node) {
880                 switch (data->hdr->id) {
881                 case id_nic:
882                         for (i = 0; i < ibft_eth_end_marker && !rc; i++)
883                                 if (ibft_check_nic_for(data->nic, i))
884                                         rc = ibft_create_attribute(data, i,
885                                                 ibft_eth_properties[i],
886                                                 ibft_attr_show_nic, attr_list);
887                         break;
888                 case id_target:
889                         for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
890                                 if (ibft_check_tgt_for(data->tgt, i))
891                                         rc = ibft_create_attribute(data, i,
892                                                 ibft_tgt_properties[i],
893                                                 ibft_attr_show_target,
894                                                 attr_list);
895                         break;
896                 case id_initiator:
897                         for (i = 0; i < ibft_init_end_marker && !rc; i++)
898                                 if (ibft_check_initiator_for(
899                                         data->initiator, i))
900                                         rc = ibft_create_attribute(data, i,
901                                                 ibft_initiator_properties[i],
902                                                 ibft_attr_show_initiator,
903                                                 attr_list);
904                         break;
905                 default:
906                         break;
907                 }
908                 if (rc)
909                         break;
910         }
911         list_for_each_entry_safe(attr, m, attr_list, node) {
912                 rc = sysfs_create_file(attr->kobj, &attr->attr);
913                 if (rc) {
914                         list_del(&attr->node);
915                         kfree(attr);
916                         break;
917                 }
918         }
919
920         return rc;
921 }
922
923 /*
924  * ibft_init() - creates sysfs tree entries for the iBFT data.
925  */
926 static int __init ibft_init(void)
927 {
928         int rc = 0;
929
930         ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
931         if (!ibft_kset)
932                 return -ENOMEM;
933
934         if (ibft_addr) {
935                 printk(KERN_INFO "iBFT detected at 0x%llx.\n",
936                        (u64)isa_virt_to_bus(ibft_addr));
937
938                 rc = ibft_check_device();
939                 if (rc)
940                         goto out_firmware_unregister;
941
942                 /* Scan the IBFT for data and register the kobjects. */
943                 rc = ibft_register_kobjects(ibft_addr, &ibft_kobject_list);
944                 if (rc)
945                         goto out_free;
946
947                 /* Register the attributes */
948                 rc = ibft_register_attributes(&ibft_kobject_list,
949                                               &ibft_attr_list);
950                 if (rc)
951                         goto out_free;
952         } else
953                 printk(KERN_INFO "No iBFT detected.\n");
954
955         return 0;
956
957 out_free:
958         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
959 out_firmware_unregister:
960         kset_unregister(ibft_kset);
961         return rc;
962 }
963
964 static void __exit ibft_exit(void)
965 {
966         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
967         kset_unregister(ibft_kset);
968 }
969
970 module_init(ibft_init);
971 module_exit(ibft_exit);