drivers/firmware/iscsi_ibft.c: remove NIPQUAD_FMT, use %pI4
[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         char *mac;
384         __be32 val;
385
386         if (!nic)
387                 return 0;
388
389         switch (attr->type) {
390         case ibft_eth_index:
391                 str += sprintf(str, "%d\n", nic->hdr.index);
392                 break;
393         case ibft_eth_flags:
394                 str += sprintf(str, "%d\n", nic->hdr.flags);
395                 break;
396         case ibft_eth_ip_addr:
397                 str += sprintf_ipaddr(str, nic->ip_addr);
398                 break;
399         case ibft_eth_subnet_mask:
400                 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
401                 str += sprintf(str, "%pI4", &val);
402                 break;
403         case ibft_eth_origin:
404                 str += sprintf(str, "%d\n", nic->origin);
405                 break;
406         case ibft_eth_gateway:
407                 str += sprintf_ipaddr(str, nic->gateway);
408                 break;
409         case ibft_eth_primary_dns:
410                 str += sprintf_ipaddr(str, nic->primary_dns);
411                 break;
412         case ibft_eth_secondary_dns:
413                 str += sprintf_ipaddr(str, nic->secondary_dns);
414                 break;
415         case ibft_eth_dhcp:
416                 str += sprintf_ipaddr(str, nic->dhcp);
417                 break;
418         case ibft_eth_vlan:
419                 str += sprintf(str, "%d\n", nic->vlan);
420                 break;
421         case ibft_eth_mac:
422                 mac = nic->mac;
423                 str += sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n",
424                                (u8)mac[0], (u8)mac[1], (u8)mac[2],
425                                (u8)mac[3], (u8)mac[4], (u8)mac[5]);
426                 break;
427         case ibft_eth_hostname:
428                 str += sprintf_string(str, nic->hostname_len,
429                                       (char *)ibft_loc + nic->hostname_off);
430                 break;
431         default:
432                 break;
433         }
434
435         return str - buf;
436 };
437
438 static ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
439                                      struct ibft_attribute *attr,
440                                      char *buf)
441 {
442         struct ibft_tgt *tgt = entry->tgt;
443         void *ibft_loc = entry->header;
444         char *str = buf;
445         int i;
446
447         if (!tgt)
448                 return 0;
449
450         switch (attr->type) {
451         case ibft_tgt_index:
452                 str += sprintf(str, "%d\n", tgt->hdr.index);
453                 break;
454         case ibft_tgt_flags:
455                 str += sprintf(str, "%d\n", tgt->hdr.flags);
456                 break;
457         case ibft_tgt_ip_addr:
458                 str += sprintf_ipaddr(str, tgt->ip_addr);
459                 break;
460         case ibft_tgt_port:
461                 str += sprintf(str, "%d\n", tgt->port);
462                 break;
463         case ibft_tgt_lun:
464                 for (i = 0; i < 8; i++)
465                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
466                 str += sprintf(str, "\n");
467                 break;
468         case ibft_tgt_nic_assoc:
469                 str += sprintf(str, "%d\n", tgt->nic_assoc);
470                 break;
471         case ibft_tgt_chap_type:
472                 str += sprintf(str, "%d\n", tgt->chap_type);
473                 break;
474         case ibft_tgt_name:
475                 str += sprintf_string(str, tgt->tgt_name_len,
476                                       (char *)ibft_loc + tgt->tgt_name_off);
477                 break;
478         case ibft_tgt_chap_name:
479                 str += sprintf_string(str, tgt->chap_name_len,
480                                       (char *)ibft_loc + tgt->chap_name_off);
481                 break;
482         case ibft_tgt_chap_secret:
483                 str += sprintf_string(str, tgt->chap_secret_len,
484                                       (char *)ibft_loc + tgt->chap_secret_off);
485                 break;
486         case ibft_tgt_rev_chap_name:
487                 str += sprintf_string(str, tgt->rev_chap_name_len,
488                                       (char *)ibft_loc +
489                                       tgt->rev_chap_name_off);
490                 break;
491         case ibft_tgt_rev_chap_secret:
492                 str += sprintf_string(str, tgt->rev_chap_secret_len,
493                                       (char *)ibft_loc +
494                                       tgt->rev_chap_secret_off);
495                 break;
496         default:
497                 break;
498         }
499
500         return str - buf;
501 }
502
503 /*
504  * The routine called for all sysfs attributes.
505  */
506 static ssize_t ibft_show_attribute(struct kobject *kobj,
507                                     struct attribute *attr,
508                                     char *buf)
509 {
510         struct ibft_kobject *dev =
511                 container_of(kobj, struct ibft_kobject, kobj);
512         struct ibft_attribute *ibft_attr =
513                 container_of(attr, struct ibft_attribute, attr);
514         ssize_t ret = -EIO;
515         char *str = buf;
516
517         if (!capable(CAP_SYS_ADMIN))
518                 return -EACCES;
519
520         if (ibft_attr->show)
521                 ret = ibft_attr->show(dev, ibft_attr, str);
522
523         return ret;
524 }
525
526 static struct sysfs_ops ibft_attr_ops = {
527         .show = ibft_show_attribute,
528 };
529
530 static struct kobj_type ibft_ktype = {
531         .release = ibft_release,
532         .sysfs_ops = &ibft_attr_ops,
533 };
534
535 static struct kset *ibft_kset;
536
537 static int __init ibft_check_device(void)
538 {
539         int len;
540         u8 *pos;
541         u8 csum = 0;
542
543         len = ibft_addr->length;
544
545         /* Sanity checking of iBFT. */
546         if (ibft_addr->revision != 1) {
547                 printk(KERN_ERR "iBFT module supports only revision 1, " \
548                                 "while this is %d.\n", ibft_addr->revision);
549                 return -ENOENT;
550         }
551         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
552                 csum += *pos;
553
554         if (csum) {
555                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
556                 return -ENOENT;
557         }
558
559         return 0;
560 }
561
562 /*
563  * Helper function for ibft_register_kobjects.
564  */
565 static int __init ibft_create_kobject(struct ibft_table_header *header,
566                                        struct ibft_hdr *hdr,
567                                        struct list_head *list)
568 {
569         struct ibft_kobject *ibft_kobj = NULL;
570         struct ibft_nic *nic = (struct ibft_nic *)hdr;
571         struct pci_dev *pci_dev;
572         int rc = 0;
573
574         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
575         if (!ibft_kobj)
576                 return -ENOMEM;
577
578         ibft_kobj->header = header;
579         ibft_kobj->hdr = hdr;
580
581         switch (hdr->id) {
582         case id_initiator:
583                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
584                                      sizeof(*ibft_kobj->initiator));
585                 break;
586         case id_nic:
587                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
588                                      sizeof(*ibft_kobj->nic));
589                 break;
590         case id_target:
591                 rc = ibft_verify_hdr("target", hdr, id_target,
592                                      sizeof(*ibft_kobj->tgt));
593                 break;
594         case id_reserved:
595         case id_control:
596         case id_extensions:
597                 /* Fields which we don't support. Ignore them */
598                 rc = 1;
599                 break;
600         default:
601                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
602                                 "Report this bug to %.6s!\n", hdr->id,
603                                 header->oem_id);
604                 rc = 1;
605                 break;
606         }
607
608         if (rc) {
609                 /* Skip adding this kobject, but exit with non-fatal error. */
610                 kfree(ibft_kobj);
611                 goto out_invalid_struct;
612         }
613
614         ibft_kobj->kobj.kset = ibft_kset;
615
616         rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
617                                   NULL, ibft_id_names[hdr->id], hdr->index);
618
619         if (rc) {
620                 kfree(ibft_kobj);
621                 goto out;
622         }
623
624         kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
625
626         if (hdr->id == id_nic) {
627                 /*
628                 * We don't search for the device in other domains than
629                 * zero. This is because on x86 platforms the BIOS
630                 * executes only devices which are in domain 0. Furthermore, the
631                 * iBFT spec doesn't have a domain id field :-(
632                 */
633                 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
634                                                (nic->pci_bdf & 0xff));
635                 if (pci_dev) {
636                         rc = sysfs_create_link(&ibft_kobj->kobj,
637                                                &pci_dev->dev.kobj, "device");
638                         pci_dev_put(pci_dev);
639                 }
640         }
641
642         /* Nothing broke so lets add it to the list. */
643         list_add_tail(&ibft_kobj->node, list);
644 out:
645         return rc;
646 out_invalid_struct:
647         /* Unsupported structs are skipped. */
648         return 0;
649 }
650
651 /*
652  * Scan the IBFT table structure for the NIC and Target fields. When
653  * found add them on the passed-in list. We do not support the other
654  * fields at this point, so they are skipped.
655  */
656 static int __init ibft_register_kobjects(struct ibft_table_header *header,
657                                           struct list_head *list)
658 {
659         struct ibft_control *control = NULL;
660         void *ptr, *end;
661         int rc = 0;
662         u16 offset;
663         u16 eot_offset;
664
665         control = (void *)header + sizeof(*header);
666         end = (void *)control + control->hdr.length;
667         eot_offset = (void *)header + header->length - (void *)control;
668         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
669                              sizeof(*control));
670
671         /* iBFT table safety checking */
672         rc |= ((control->hdr.index) ? -ENODEV : 0);
673         if (rc) {
674                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
675                 return rc;
676         }
677         for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
678                 offset = *(u16 *)ptr;
679                 if (offset && offset < header->length && offset < eot_offset) {
680                         rc = ibft_create_kobject(header,
681                                                  (void *)header + offset,
682                                                  list);
683                         if (rc)
684                                 break;
685                 }
686         }
687
688         return rc;
689 }
690
691 static void ibft_unregister(struct list_head *attr_list,
692                              struct list_head *kobj_list)
693 {
694         struct ibft_kobject *data = NULL, *n;
695         struct ibft_attribute *attr = NULL, *m;
696
697         list_for_each_entry_safe(attr, m, attr_list, node) {
698                 sysfs_remove_file(attr->kobj, &attr->attr);
699                 list_del(&attr->node);
700                 kfree(attr);
701         };
702         list_del_init(attr_list);
703
704         list_for_each_entry_safe(data, n, kobj_list, node) {
705                 list_del(&data->node);
706                 if (data->hdr->id == id_nic)
707                         sysfs_remove_link(&data->kobj, "device");
708                 kobject_put(&data->kobj);
709         };
710         list_del_init(kobj_list);
711 }
712
713 static int __init ibft_create_attribute(struct ibft_kobject *kobj_data,
714                                          int type,
715                                          const char *name,
716                                          ssize_t (*show)(struct ibft_kobject *,
717                                                          struct ibft_attribute*,
718                                                          char *buf),
719                                          struct list_head *list)
720 {
721         struct ibft_attribute *attr = NULL;
722         struct ibft_hdr *hdr = kobj_data->hdr;
723
724         attr = kmalloc(sizeof(*attr), GFP_KERNEL);
725         if (!attr)
726                 return -ENOMEM;
727
728         attr->attr.name = name;
729         attr->attr.mode = S_IRUSR;
730
731         attr->hdr = hdr;
732         attr->show = show;
733         attr->kobj = &kobj_data->kobj;
734         attr->type = type;
735
736         list_add_tail(&attr->node, list);
737
738         return 0;
739 }
740
741 /*
742  * Helper routiners to check to determine if the entry is valid
743  * in the proper iBFT structure.
744  */
745 static int __init ibft_check_nic_for(struct ibft_nic *nic, int entry)
746 {
747         int rc = 0;
748
749         switch (entry) {
750         case ibft_eth_index:
751         case ibft_eth_flags:
752                 rc = 1;
753                 break;
754         case ibft_eth_ip_addr:
755                 if (memcmp(nic->ip_addr, nulls, sizeof(nic->ip_addr)))
756                         rc = 1;
757                 break;
758         case ibft_eth_subnet_mask:
759                 if (nic->subnet_mask_prefix)
760                         rc = 1;
761                 break;
762         case ibft_eth_origin:
763                 rc = 1;
764                 break;
765         case ibft_eth_gateway:
766                 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
767                         rc = 1;
768                 break;
769         case ibft_eth_primary_dns:
770                 if (memcmp(nic->primary_dns, nulls,
771                            sizeof(nic->primary_dns)))
772                         rc = 1;
773                 break;
774         case ibft_eth_secondary_dns:
775                 if (memcmp(nic->secondary_dns, nulls,
776                            sizeof(nic->secondary_dns)))
777                         rc = 1;
778                 break;
779         case ibft_eth_dhcp:
780                 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
781                         rc = 1;
782                 break;
783         case ibft_eth_vlan:
784         case ibft_eth_mac:
785                 rc = 1;
786                 break;
787         case ibft_eth_hostname:
788                 if (nic->hostname_off)
789                         rc = 1;
790                 break;
791         default:
792                 break;
793         }
794
795         return rc;
796 }
797
798 static int __init ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
799 {
800         int rc = 0;
801
802         switch (entry) {
803         case ibft_tgt_index:
804         case ibft_tgt_flags:
805         case ibft_tgt_ip_addr:
806         case ibft_tgt_port:
807         case ibft_tgt_lun:
808         case ibft_tgt_nic_assoc:
809         case ibft_tgt_chap_type:
810                 rc = 1;
811         case ibft_tgt_name:
812                 if (tgt->tgt_name_len)
813                         rc = 1;
814                 break;
815         case ibft_tgt_chap_name:
816         case ibft_tgt_chap_secret:
817                 if (tgt->chap_name_len)
818                         rc = 1;
819                 break;
820         case ibft_tgt_rev_chap_name:
821         case ibft_tgt_rev_chap_secret:
822                 if (tgt->rev_chap_name_len)
823                         rc = 1;
824                 break;
825         default:
826                 break;
827         }
828
829         return rc;
830 }
831
832 static int __init ibft_check_initiator_for(struct ibft_initiator *init,
833                                             int entry)
834 {
835         int rc = 0;
836
837         switch (entry) {
838         case ibft_init_index:
839         case ibft_init_flags:
840                 rc = 1;
841                 break;
842         case ibft_init_isns_server:
843                 if (memcmp(init->isns_server, nulls,
844                            sizeof(init->isns_server)))
845                         rc = 1;
846                 break;
847         case ibft_init_slp_server:
848                 if (memcmp(init->slp_server, nulls,
849                            sizeof(init->slp_server)))
850                         rc = 1;
851                 break;
852         case ibft_init_pri_radius_server:
853                 if (memcmp(init->pri_radius_server, nulls,
854                            sizeof(init->pri_radius_server)))
855                         rc = 1;
856                 break;
857         case ibft_init_sec_radius_server:
858                 if (memcmp(init->sec_radius_server, nulls,
859                            sizeof(init->sec_radius_server)))
860                         rc = 1;
861                 break;
862         case ibft_init_initiator_name:
863                 if (init->initiator_name_len)
864                         rc = 1;
865                 break;
866         default:
867                 break;
868         }
869
870         return rc;
871 }
872
873 /*
874  *  Register the attributes for all of the kobjects.
875  */
876 static int __init ibft_register_attributes(struct list_head *kobject_list,
877                                             struct list_head *attr_list)
878 {
879         int rc = 0, i = 0;
880         struct ibft_kobject *data = NULL;
881         struct ibft_attribute *attr = NULL, *m;
882
883         list_for_each_entry(data, kobject_list, node) {
884                 switch (data->hdr->id) {
885                 case id_nic:
886                         for (i = 0; i < ibft_eth_end_marker && !rc; i++)
887                                 if (ibft_check_nic_for(data->nic, i))
888                                         rc = ibft_create_attribute(data, i,
889                                                 ibft_eth_properties[i],
890                                                 ibft_attr_show_nic, attr_list);
891                         break;
892                 case id_target:
893                         for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
894                                 if (ibft_check_tgt_for(data->tgt, i))
895                                         rc = ibft_create_attribute(data, i,
896                                                 ibft_tgt_properties[i],
897                                                 ibft_attr_show_target,
898                                                 attr_list);
899                         break;
900                 case id_initiator:
901                         for (i = 0; i < ibft_init_end_marker && !rc; i++)
902                                 if (ibft_check_initiator_for(
903                                         data->initiator, i))
904                                         rc = ibft_create_attribute(data, i,
905                                                 ibft_initiator_properties[i],
906                                                 ibft_attr_show_initiator,
907                                                 attr_list);
908                         break;
909                 default:
910                         break;
911                 }
912                 if (rc)
913                         break;
914         }
915         list_for_each_entry_safe(attr, m, attr_list, node) {
916                 rc = sysfs_create_file(attr->kobj, &attr->attr);
917                 if (rc) {
918                         list_del(&attr->node);
919                         kfree(attr);
920                         break;
921                 }
922         }
923
924         return rc;
925 }
926
927 /*
928  * ibft_init() - creates sysfs tree entries for the iBFT data.
929  */
930 static int __init ibft_init(void)
931 {
932         int rc = 0;
933
934         ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
935         if (!ibft_kset)
936                 return -ENOMEM;
937
938         if (ibft_addr) {
939                 printk(KERN_INFO "iBFT detected at 0x%llx.\n",
940                        (u64)isa_virt_to_bus(ibft_addr));
941
942                 rc = ibft_check_device();
943                 if (rc)
944                         goto out_firmware_unregister;
945
946                 /* Scan the IBFT for data and register the kobjects. */
947                 rc = ibft_register_kobjects(ibft_addr, &ibft_kobject_list);
948                 if (rc)
949                         goto out_free;
950
951                 /* Register the attributes */
952                 rc = ibft_register_attributes(&ibft_kobject_list,
953                                               &ibft_attr_list);
954                 if (rc)
955                         goto out_free;
956         } else
957                 printk(KERN_INFO "No iBFT detected.\n");
958
959         return 0;
960
961 out_free:
962         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
963 out_firmware_unregister:
964         kset_unregister(ibft_kset);
965         return rc;
966 }
967
968 static void __exit ibft_exit(void)
969 {
970         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
971         kset_unregister(ibft_kset);
972 }
973
974 module_init(ibft_init);
975 module_exit(ibft_exit);