x86: sysfs: kill owner field from attribute
[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, NIPQUAD_FMT, ip[12],
288                                ip[13], ip[14], ip[15]);
289         } else {
290                 /*
291                  * IPv6
292                  */
293                 str += sprintf(str, NIP6_FMT, ntohs(ip[0]), ntohs(ip[1]),
294                                ntohs(ip[2]), ntohs(ip[3]), ntohs(ip[4]),
295                                ntohs(ip[5]), ntohs(ip[6]), ntohs(ip[7]));
296         }
297         str += sprintf(str, "\n");
298         return str - buf;
299 }
300
301 static ssize_t sprintf_string(char *str, int len, char *buf)
302 {
303         return sprintf(str, "%.*s\n", len, buf);
304 }
305
306 /*
307  * Helper function to verify the IBFT header.
308  */
309 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
310 {
311         if (hdr->id != id) {
312                 printk(KERN_ERR "iBFT error: We expected the " \
313                                 "field header.id to have %d but " \
314                                 "found %d instead!\n", id, hdr->id);
315                 return -ENODEV;
316         }
317         if (hdr->length != length) {
318                 printk(KERN_ERR "iBFT error: We expected the " \
319                                 "field header.length to have %d but " \
320                                 "found %d instead!\n", length, hdr->length);
321                 return -ENODEV;
322         }
323
324         return 0;
325 }
326
327 static void ibft_release(struct kobject *kobj)
328 {
329         struct ibft_kobject *ibft =
330                 container_of(kobj, struct ibft_kobject, kobj);
331         kfree(ibft);
332 }
333
334 /*
335  *  Routines for parsing the iBFT data to be human readable.
336  */
337 static ssize_t ibft_attr_show_initiator(struct ibft_kobject *entry,
338                                         struct ibft_attribute *attr,
339                                         char *buf)
340 {
341         struct ibft_initiator *initiator = entry->initiator;
342         void *ibft_loc = entry->header;
343         char *str = buf;
344
345         if (!initiator)
346                 return 0;
347
348         switch (attr->type) {
349         case ibft_init_index:
350                 str += sprintf(str, "%d\n", initiator->hdr.index);
351                 break;
352         case ibft_init_flags:
353                 str += sprintf(str, "%d\n", initiator->hdr.flags);
354                 break;
355         case ibft_init_isns_server:
356                 str += sprintf_ipaddr(str, initiator->isns_server);
357                 break;
358         case ibft_init_slp_server:
359                 str += sprintf_ipaddr(str, initiator->slp_server);
360                 break;
361         case ibft_init_pri_radius_server:
362                 str += sprintf_ipaddr(str, initiator->pri_radius_server);
363                 break;
364         case ibft_init_sec_radius_server:
365                 str += sprintf_ipaddr(str, initiator->sec_radius_server);
366                 break;
367         case ibft_init_initiator_name:
368                 str += sprintf_string(str, initiator->initiator_name_len,
369                                       (char *)ibft_loc +
370                                       initiator->initiator_name_off);
371                 break;
372         default:
373                 break;
374         }
375
376         return str - buf;
377 }
378
379 static ssize_t ibft_attr_show_nic(struct ibft_kobject *entry,
380                                   struct ibft_attribute *attr,
381                                   char *buf)
382 {
383         struct ibft_nic *nic = entry->nic;
384         void *ibft_loc = entry->header;
385         char *str = buf;
386         char *mac;
387         int val;
388
389         if (!nic)
390                 return 0;
391
392         switch (attr->type) {
393         case ibft_eth_index:
394                 str += sprintf(str, "%d\n", nic->hdr.index);
395                 break;
396         case ibft_eth_flags:
397                 str += sprintf(str, "%d\n", nic->hdr.flags);
398                 break;
399         case ibft_eth_ip_addr:
400                 str += sprintf_ipaddr(str, nic->ip_addr);
401                 break;
402         case ibft_eth_subnet_mask:
403                 val = ~((1 << (32-nic->subnet_mask_prefix))-1);
404                 str += sprintf(str, NIPQUAD_FMT,
405                                (u8)(val >> 24), (u8)(val >> 16),
406                                (u8)(val >> 8), (u8)(val));
407                 break;
408         case ibft_eth_origin:
409                 str += sprintf(str, "%d\n", nic->origin);
410                 break;
411         case ibft_eth_gateway:
412                 str += sprintf_ipaddr(str, nic->gateway);
413                 break;
414         case ibft_eth_primary_dns:
415                 str += sprintf_ipaddr(str, nic->primary_dns);
416                 break;
417         case ibft_eth_secondary_dns:
418                 str += sprintf_ipaddr(str, nic->secondary_dns);
419                 break;
420         case ibft_eth_dhcp:
421                 str += sprintf_ipaddr(str, nic->dhcp);
422                 break;
423         case ibft_eth_vlan:
424                 str += sprintf(str, "%d\n", nic->vlan);
425                 break;
426         case ibft_eth_mac:
427                 mac = nic->mac;
428                 str += sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n",
429                                (u8)mac[0], (u8)mac[1], (u8)mac[2],
430                                (u8)mac[3], (u8)mac[4], (u8)mac[5]);
431                 break;
432         case ibft_eth_hostname:
433                 str += sprintf_string(str, nic->hostname_len,
434                                       (char *)ibft_loc + nic->hostname_off);
435                 break;
436         default:
437                 break;
438         }
439
440         return str - buf;
441 };
442
443 static ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
444                                      struct ibft_attribute *attr,
445                                      char *buf)
446 {
447         struct ibft_tgt *tgt = entry->tgt;
448         void *ibft_loc = entry->header;
449         char *str = buf;
450         int i;
451
452         if (!tgt)
453                 return 0;
454
455         switch (attr->type) {
456         case ibft_tgt_index:
457                 str += sprintf(str, "%d\n", tgt->hdr.index);
458                 break;
459         case ibft_tgt_flags:
460                 str += sprintf(str, "%d\n", tgt->hdr.flags);
461                 break;
462         case ibft_tgt_ip_addr:
463                 str += sprintf_ipaddr(str, tgt->ip_addr);
464                 break;
465         case ibft_tgt_port:
466                 str += sprintf(str, "%d\n", tgt->port);
467                 break;
468         case ibft_tgt_lun:
469                 for (i = 0; i < 8; i++)
470                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
471                 str += sprintf(str, "\n");
472                 break;
473         case ibft_tgt_nic_assoc:
474                 str += sprintf(str, "%d\n", tgt->nic_assoc);
475                 break;
476         case ibft_tgt_chap_type:
477                 str += sprintf(str, "%d\n", tgt->chap_type);
478                 break;
479         case ibft_tgt_name:
480                 str += sprintf_string(str, tgt->tgt_name_len,
481                                       (char *)ibft_loc + tgt->tgt_name_off);
482                 break;
483         case ibft_tgt_chap_name:
484                 str += sprintf_string(str, tgt->chap_name_len,
485                                       (char *)ibft_loc + tgt->chap_name_off);
486                 break;
487         case ibft_tgt_chap_secret:
488                 str += sprintf_string(str, tgt->chap_secret_len,
489                                       (char *)ibft_loc + tgt->chap_secret_off);
490                 break;
491         case ibft_tgt_rev_chap_name:
492                 str += sprintf_string(str, tgt->rev_chap_name_len,
493                                       (char *)ibft_loc +
494                                       tgt->rev_chap_name_off);
495                 break;
496         case ibft_tgt_rev_chap_secret:
497                 str += sprintf_string(str, tgt->rev_chap_secret_len,
498                                       (char *)ibft_loc +
499                                       tgt->rev_chap_secret_off);
500                 break;
501         default:
502                 break;
503         }
504
505         return str - buf;
506 }
507
508 /*
509  * The routine called for all sysfs attributes.
510  */
511 static ssize_t ibft_show_attribute(struct kobject *kobj,
512                                     struct attribute *attr,
513                                     char *buf)
514 {
515         struct ibft_kobject *dev =
516                 container_of(kobj, struct ibft_kobject, kobj);
517         struct ibft_attribute *ibft_attr =
518                 container_of(attr, struct ibft_attribute, attr);
519         ssize_t ret = -EIO;
520         char *str = buf;
521
522         if (!capable(CAP_SYS_ADMIN))
523                 return -EACCES;
524
525         if (ibft_attr->show)
526                 ret = ibft_attr->show(dev, ibft_attr, str);
527
528         return ret;
529 }
530
531 static struct sysfs_ops ibft_attr_ops = {
532         .show = ibft_show_attribute,
533 };
534
535 static struct kobj_type ibft_ktype = {
536         .release = ibft_release,
537         .sysfs_ops = &ibft_attr_ops,
538 };
539
540 static struct kset *ibft_kset;
541
542 static int __init ibft_check_device(void)
543 {
544         int len;
545         u8 *pos;
546         u8 csum = 0;
547
548         len = ibft_addr->length;
549
550         /* Sanity checking of iBFT. */
551         if (ibft_addr->revision != 1) {
552                 printk(KERN_ERR "iBFT module supports only revision 1, " \
553                                 "while this is %d.\n", ibft_addr->revision);
554                 return -ENOENT;
555         }
556         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
557                 csum += *pos;
558
559         if (csum) {
560                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
561                 return -ENOENT;
562         }
563
564         return 0;
565 }
566
567 /*
568  * Helper function for ibft_register_kobjects.
569  */
570 static int __init ibft_create_kobject(struct ibft_table_header *header,
571                                        struct ibft_hdr *hdr,
572                                        struct list_head *list)
573 {
574         struct ibft_kobject *ibft_kobj = NULL;
575         struct ibft_nic *nic = (struct ibft_nic *)hdr;
576         struct pci_dev *pci_dev;
577         int rc = 0;
578
579         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
580         if (!ibft_kobj)
581                 return -ENOMEM;
582
583         ibft_kobj->header = header;
584         ibft_kobj->hdr = hdr;
585
586         switch (hdr->id) {
587         case id_initiator:
588                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
589                                      sizeof(*ibft_kobj->initiator));
590                 break;
591         case id_nic:
592                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
593                                      sizeof(*ibft_kobj->nic));
594                 break;
595         case id_target:
596                 rc = ibft_verify_hdr("target", hdr, id_target,
597                                      sizeof(*ibft_kobj->tgt));
598                 break;
599         case id_reserved:
600         case id_control:
601         case id_extensions:
602                 /* Fields which we don't support. Ignore them */
603                 rc = 1;
604                 break;
605         default:
606                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
607                                 "Report this bug to %.6s!\n", hdr->id,
608                                 header->oem_id);
609                 rc = 1;
610                 break;
611         }
612
613         if (rc) {
614                 /* Skip adding this kobject, but exit with non-fatal error. */
615                 kfree(ibft_kobj);
616                 goto out_invalid_struct;
617         }
618
619         ibft_kobj->kobj.kset = ibft_kset;
620
621         rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
622                                   NULL, ibft_id_names[hdr->id], hdr->index);
623
624         if (rc) {
625                 kfree(ibft_kobj);
626                 goto out;
627         }
628
629         kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
630
631         if (hdr->id == id_nic) {
632                 /*
633                 * We don't search for the device in other domains than
634                 * zero. This is because on x86 platforms the BIOS
635                 * executes only devices which are in domain 0. Furthermore, the
636                 * iBFT spec doesn't have a domain id field :-(
637                 */
638                 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
639                                                (nic->pci_bdf & 0xff));
640                 if (pci_dev) {
641                         rc = sysfs_create_link(&ibft_kobj->kobj,
642                                                &pci_dev->dev.kobj, "device");
643                         pci_dev_put(pci_dev);
644                 }
645         }
646
647         /* Nothing broke so lets add it to the list. */
648         list_add_tail(&ibft_kobj->node, list);
649 out:
650         return rc;
651 out_invalid_struct:
652         /* Unsupported structs are skipped. */
653         return 0;
654 }
655
656 /*
657  * Scan the IBFT table structure for the NIC and Target fields. When
658  * found add them on the passed-in list. We do not support the other
659  * fields at this point, so they are skipped.
660  */
661 static int __init ibft_register_kobjects(struct ibft_table_header *header,
662                                           struct list_head *list)
663 {
664         struct ibft_control *control = NULL;
665         void *ptr, *end;
666         int rc = 0;
667         u16 offset;
668         u16 eot_offset;
669
670         control = (void *)header + sizeof(*header);
671         end = (void *)control + control->hdr.length;
672         eot_offset = (void *)header + header->length - (void *)control;
673         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
674                              sizeof(*control));
675
676         /* iBFT table safety checking */
677         rc |= ((control->hdr.index) ? -ENODEV : 0);
678         if (rc) {
679                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
680                 return rc;
681         }
682         for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
683                 offset = *(u16 *)ptr;
684                 if (offset && offset < header->length && offset < eot_offset) {
685                         rc = ibft_create_kobject(header,
686                                                  (void *)header + offset,
687                                                  list);
688                         if (rc)
689                                 break;
690                 }
691         }
692
693         return rc;
694 }
695
696 static void ibft_unregister(struct list_head *attr_list,
697                              struct list_head *kobj_list)
698 {
699         struct ibft_kobject *data = NULL, *n;
700         struct ibft_attribute *attr = NULL, *m;
701
702         list_for_each_entry_safe(attr, m, attr_list, node) {
703                 sysfs_remove_file(attr->kobj, &attr->attr);
704                 list_del(&attr->node);
705                 kfree(attr);
706         };
707         list_del_init(attr_list);
708
709         list_for_each_entry_safe(data, n, kobj_list, node) {
710                 list_del(&data->node);
711                 if (data->hdr->id == id_nic)
712                         sysfs_remove_link(&data->kobj, "device");
713                 kobject_put(&data->kobj);
714         };
715         list_del_init(kobj_list);
716 }
717
718 static int __init ibft_create_attribute(struct ibft_kobject *kobj_data,
719                                          int type,
720                                          const char *name,
721                                          ssize_t (*show)(struct ibft_kobject *,
722                                                          struct ibft_attribute*,
723                                                          char *buf),
724                                          struct list_head *list)
725 {
726         struct ibft_attribute *attr = NULL;
727         struct ibft_hdr *hdr = kobj_data->hdr;
728
729         attr = kmalloc(sizeof(*attr), GFP_KERNEL);
730         if (!attr)
731                 return -ENOMEM;
732
733         attr->attr.name = name;
734         attr->attr.mode = S_IRUSR;
735
736         attr->hdr = hdr;
737         attr->show = show;
738         attr->kobj = &kobj_data->kobj;
739         attr->type = type;
740
741         list_add_tail(&attr->node, list);
742
743         return 0;
744 }
745
746 /*
747  * Helper routiners to check to determine if the entry is valid
748  * in the proper iBFT structure.
749  */
750 static int __init ibft_check_nic_for(struct ibft_nic *nic, int entry)
751 {
752         int rc = 0;
753
754         switch (entry) {
755         case ibft_eth_index:
756         case ibft_eth_flags:
757                 rc = 1;
758                 break;
759         case ibft_eth_ip_addr:
760                 if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
761                         rc = 1;
762                 break;
763         case ibft_eth_subnet_mask:
764                 if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
765                         rc = 1;
766                 break;
767         case ibft_eth_origin:
768                 rc = 1;
769                 break;
770         case ibft_eth_gateway:
771                 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
772                         rc = 1;
773                 break;
774         case ibft_eth_primary_dns:
775                 if (memcmp(nic->primary_dns, nulls,
776                            sizeof(nic->primary_dns)))
777                         rc = 1;
778                 break;
779         case ibft_eth_secondary_dns:
780                 if (memcmp(nic->secondary_dns, nulls,
781                            sizeof(nic->secondary_dns)))
782                         rc = 1;
783                 break;
784         case ibft_eth_dhcp:
785                 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
786                         rc = 1;
787                 break;
788         case ibft_eth_vlan:
789         case ibft_eth_mac:
790                 rc = 1;
791                 break;
792         case ibft_eth_hostname:
793                 if (nic->hostname_off)
794                         rc = 1;
795                 break;
796         default:
797                 break;
798         }
799
800         return rc;
801 }
802
803 static int __init ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
804 {
805         int rc = 0;
806
807         switch (entry) {
808         case ibft_tgt_index:
809         case ibft_tgt_flags:
810         case ibft_tgt_ip_addr:
811         case ibft_tgt_port:
812         case ibft_tgt_lun:
813         case ibft_tgt_nic_assoc:
814         case ibft_tgt_chap_type:
815                 rc = 1;
816         case ibft_tgt_name:
817                 if (tgt->tgt_name_len)
818                         rc = 1;
819                 break;
820         case ibft_tgt_chap_name:
821         case ibft_tgt_chap_secret:
822                 if (tgt->chap_name_len)
823                         rc = 1;
824                 break;
825         case ibft_tgt_rev_chap_name:
826         case ibft_tgt_rev_chap_secret:
827                 if (tgt->rev_chap_name_len)
828                         rc = 1;
829                 break;
830         default:
831                 break;
832         }
833
834         return rc;
835 }
836
837 static int __init ibft_check_initiator_for(struct ibft_initiator *init,
838                                             int entry)
839 {
840         int rc = 0;
841
842         switch (entry) {
843         case ibft_init_index:
844         case ibft_init_flags:
845                 rc = 1;
846                 break;
847         case ibft_init_isns_server:
848                 if (memcmp(init->isns_server, nulls,
849                            sizeof(init->isns_server)))
850                         rc = 1;
851                 break;
852         case ibft_init_slp_server:
853                 if (memcmp(init->slp_server, nulls,
854                            sizeof(init->slp_server)))
855                         rc = 1;
856                 break;
857         case ibft_init_pri_radius_server:
858                 if (memcmp(init->pri_radius_server, nulls,
859                            sizeof(init->pri_radius_server)))
860                         rc = 1;
861                 break;
862         case ibft_init_sec_radius_server:
863                 if (memcmp(init->sec_radius_server, nulls,
864                            sizeof(init->sec_radius_server)))
865                         rc = 1;
866                 break;
867         case ibft_init_initiator_name:
868                 if (init->initiator_name_len)
869                         rc = 1;
870                 break;
871         default:
872                 break;
873         }
874
875         return rc;
876 }
877
878 /*
879  *  Register the attributes for all of the kobjects.
880  */
881 static int __init ibft_register_attributes(struct list_head *kobject_list,
882                                             struct list_head *attr_list)
883 {
884         int rc = 0, i = 0;
885         struct ibft_kobject *data = NULL;
886         struct ibft_attribute *attr = NULL, *m;
887
888         list_for_each_entry(data, kobject_list, node) {
889                 switch (data->hdr->id) {
890                 case id_nic:
891                         for (i = 0; i < ibft_eth_end_marker && !rc; i++)
892                                 if (ibft_check_nic_for(data->nic, i))
893                                         rc = ibft_create_attribute(data, i,
894                                                 ibft_eth_properties[i],
895                                                 ibft_attr_show_nic, attr_list);
896                         break;
897                 case id_target:
898                         for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
899                                 if (ibft_check_tgt_for(data->tgt, i))
900                                         rc = ibft_create_attribute(data, i,
901                                                 ibft_tgt_properties[i],
902                                                 ibft_attr_show_target,
903                                                 attr_list);
904                         break;
905                 case id_initiator:
906                         for (i = 0; i < ibft_init_end_marker && !rc; i++)
907                                 if (ibft_check_initiator_for(
908                                         data->initiator, i))
909                                         rc = ibft_create_attribute(data, i,
910                                                 ibft_initiator_properties[i],
911                                                 ibft_attr_show_initiator,
912                                                 attr_list);
913                         break;
914                 default:
915                         break;
916                 }
917                 if (rc)
918                         break;
919         }
920         list_for_each_entry_safe(attr, m, attr_list, node) {
921                 rc = sysfs_create_file(attr->kobj, &attr->attr);
922                 if (rc) {
923                         list_del(&attr->node);
924                         kfree(attr);
925                         break;
926                 }
927         }
928
929         return rc;
930 }
931
932 /*
933  * ibft_init() - creates sysfs tree entries for the iBFT data.
934  */
935 static int __init ibft_init(void)
936 {
937         int rc = 0;
938
939         ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
940         if (!ibft_kset)
941                 return -ENOMEM;
942
943         if (ibft_addr) {
944                 printk(KERN_INFO "iBFT detected at 0x%lx.\n",
945                        virt_to_phys((void *)ibft_addr));
946
947                 rc = ibft_check_device();
948                 if (rc)
949                         goto out_firmware_unregister;
950
951                 /* Scan the IBFT for data and register the kobjects. */
952                 rc = ibft_register_kobjects(ibft_addr, &ibft_kobject_list);
953                 if (rc)
954                         goto out_free;
955
956                 /* Register the attributes */
957                 rc = ibft_register_attributes(&ibft_kobject_list,
958                                               &ibft_attr_list);
959                 if (rc)
960                         goto out_free;
961         } else
962                 printk(KERN_INFO "No iBFT detected.\n");
963
964         return 0;
965
966 out_free:
967         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
968 out_firmware_unregister:
969         kset_unregister(ibft_kset);
970         return rc;
971 }
972
973 static void __exit ibft_exit(void)
974 {
975         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
976         kset_unregister(ibft_kset);
977 }
978
979 module_init(ibft_init);
980 module_exit(ibft_exit);