net: replace %p6 with %pI6
[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, "%pI6", ip);
294         }
295         str += sprintf(str, "\n");
296         return str - buf;
297 }
298
299 static ssize_t sprintf_string(char *str, int len, char *buf)
300 {
301         return sprintf(str, "%.*s\n", len, buf);
302 }
303
304 /*
305  * Helper function to verify the IBFT header.
306  */
307 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
308 {
309         if (hdr->id != id) {
310                 printk(KERN_ERR "iBFT error: We expected the " \
311                                 "field header.id to have %d but " \
312                                 "found %d instead!\n", id, hdr->id);
313                 return -ENODEV;
314         }
315         if (hdr->length != length) {
316                 printk(KERN_ERR "iBFT error: We expected the " \
317                                 "field header.length to have %d but " \
318                                 "found %d instead!\n", length, hdr->length);
319                 return -ENODEV;
320         }
321
322         return 0;
323 }
324
325 static void ibft_release(struct kobject *kobj)
326 {
327         struct ibft_kobject *ibft =
328                 container_of(kobj, struct ibft_kobject, kobj);
329         kfree(ibft);
330 }
331
332 /*
333  *  Routines for parsing the iBFT data to be human readable.
334  */
335 static ssize_t ibft_attr_show_initiator(struct ibft_kobject *entry,
336                                         struct ibft_attribute *attr,
337                                         char *buf)
338 {
339         struct ibft_initiator *initiator = entry->initiator;
340         void *ibft_loc = entry->header;
341         char *str = buf;
342
343         if (!initiator)
344                 return 0;
345
346         switch (attr->type) {
347         case ibft_init_index:
348                 str += sprintf(str, "%d\n", initiator->hdr.index);
349                 break;
350         case ibft_init_flags:
351                 str += sprintf(str, "%d\n", initiator->hdr.flags);
352                 break;
353         case ibft_init_isns_server:
354                 str += sprintf_ipaddr(str, initiator->isns_server);
355                 break;
356         case ibft_init_slp_server:
357                 str += sprintf_ipaddr(str, initiator->slp_server);
358                 break;
359         case ibft_init_pri_radius_server:
360                 str += sprintf_ipaddr(str, initiator->pri_radius_server);
361                 break;
362         case ibft_init_sec_radius_server:
363                 str += sprintf_ipaddr(str, initiator->sec_radius_server);
364                 break;
365         case ibft_init_initiator_name:
366                 str += sprintf_string(str, initiator->initiator_name_len,
367                                       (char *)ibft_loc +
368                                       initiator->initiator_name_off);
369                 break;
370         default:
371                 break;
372         }
373
374         return str - buf;
375 }
376
377 static ssize_t ibft_attr_show_nic(struct ibft_kobject *entry,
378                                   struct ibft_attribute *attr,
379                                   char *buf)
380 {
381         struct ibft_nic *nic = entry->nic;
382         void *ibft_loc = entry->header;
383         char *str = buf;
384         char *mac;
385         int val;
386
387         if (!nic)
388                 return 0;
389
390         switch (attr->type) {
391         case ibft_eth_index:
392                 str += sprintf(str, "%d\n", nic->hdr.index);
393                 break;
394         case ibft_eth_flags:
395                 str += sprintf(str, "%d\n", nic->hdr.flags);
396                 break;
397         case ibft_eth_ip_addr:
398                 str += sprintf_ipaddr(str, nic->ip_addr);
399                 break;
400         case ibft_eth_subnet_mask:
401                 val = ~((1 << (32-nic->subnet_mask_prefix))-1);
402                 str += sprintf(str, NIPQUAD_FMT,
403                                (u8)(val >> 24), (u8)(val >> 16),
404                                (u8)(val >> 8), (u8)(val));
405                 break;
406         case ibft_eth_origin:
407                 str += sprintf(str, "%d\n", nic->origin);
408                 break;
409         case ibft_eth_gateway:
410                 str += sprintf_ipaddr(str, nic->gateway);
411                 break;
412         case ibft_eth_primary_dns:
413                 str += sprintf_ipaddr(str, nic->primary_dns);
414                 break;
415         case ibft_eth_secondary_dns:
416                 str += sprintf_ipaddr(str, nic->secondary_dns);
417                 break;
418         case ibft_eth_dhcp:
419                 str += sprintf_ipaddr(str, nic->dhcp);
420                 break;
421         case ibft_eth_vlan:
422                 str += sprintf(str, "%d\n", nic->vlan);
423                 break;
424         case ibft_eth_mac:
425                 mac = nic->mac;
426                 str += sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n",
427                                (u8)mac[0], (u8)mac[1], (u8)mac[2],
428                                (u8)mac[3], (u8)mac[4], (u8)mac[5]);
429                 break;
430         case ibft_eth_hostname:
431                 str += sprintf_string(str, nic->hostname_len,
432                                       (char *)ibft_loc + nic->hostname_off);
433                 break;
434         default:
435                 break;
436         }
437
438         return str - buf;
439 };
440
441 static ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
442                                      struct ibft_attribute *attr,
443                                      char *buf)
444 {
445         struct ibft_tgt *tgt = entry->tgt;
446         void *ibft_loc = entry->header;
447         char *str = buf;
448         int i;
449
450         if (!tgt)
451                 return 0;
452
453         switch (attr->type) {
454         case ibft_tgt_index:
455                 str += sprintf(str, "%d\n", tgt->hdr.index);
456                 break;
457         case ibft_tgt_flags:
458                 str += sprintf(str, "%d\n", tgt->hdr.flags);
459                 break;
460         case ibft_tgt_ip_addr:
461                 str += sprintf_ipaddr(str, tgt->ip_addr);
462                 break;
463         case ibft_tgt_port:
464                 str += sprintf(str, "%d\n", tgt->port);
465                 break;
466         case ibft_tgt_lun:
467                 for (i = 0; i < 8; i++)
468                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
469                 str += sprintf(str, "\n");
470                 break;
471         case ibft_tgt_nic_assoc:
472                 str += sprintf(str, "%d\n", tgt->nic_assoc);
473                 break;
474         case ibft_tgt_chap_type:
475                 str += sprintf(str, "%d\n", tgt->chap_type);
476                 break;
477         case ibft_tgt_name:
478                 str += sprintf_string(str, tgt->tgt_name_len,
479                                       (char *)ibft_loc + tgt->tgt_name_off);
480                 break;
481         case ibft_tgt_chap_name:
482                 str += sprintf_string(str, tgt->chap_name_len,
483                                       (char *)ibft_loc + tgt->chap_name_off);
484                 break;
485         case ibft_tgt_chap_secret:
486                 str += sprintf_string(str, tgt->chap_secret_len,
487                                       (char *)ibft_loc + tgt->chap_secret_off);
488                 break;
489         case ibft_tgt_rev_chap_name:
490                 str += sprintf_string(str, tgt->rev_chap_name_len,
491                                       (char *)ibft_loc +
492                                       tgt->rev_chap_name_off);
493                 break;
494         case ibft_tgt_rev_chap_secret:
495                 str += sprintf_string(str, tgt->rev_chap_secret_len,
496                                       (char *)ibft_loc +
497                                       tgt->rev_chap_secret_off);
498                 break;
499         default:
500                 break;
501         }
502
503         return str - buf;
504 }
505
506 /*
507  * The routine called for all sysfs attributes.
508  */
509 static ssize_t ibft_show_attribute(struct kobject *kobj,
510                                     struct attribute *attr,
511                                     char *buf)
512 {
513         struct ibft_kobject *dev =
514                 container_of(kobj, struct ibft_kobject, kobj);
515         struct ibft_attribute *ibft_attr =
516                 container_of(attr, struct ibft_attribute, attr);
517         ssize_t ret = -EIO;
518         char *str = buf;
519
520         if (!capable(CAP_SYS_ADMIN))
521                 return -EACCES;
522
523         if (ibft_attr->show)
524                 ret = ibft_attr->show(dev, ibft_attr, str);
525
526         return ret;
527 }
528
529 static struct sysfs_ops ibft_attr_ops = {
530         .show = ibft_show_attribute,
531 };
532
533 static struct kobj_type ibft_ktype = {
534         .release = ibft_release,
535         .sysfs_ops = &ibft_attr_ops,
536 };
537
538 static struct kset *ibft_kset;
539
540 static int __init ibft_check_device(void)
541 {
542         int len;
543         u8 *pos;
544         u8 csum = 0;
545
546         len = ibft_addr->length;
547
548         /* Sanity checking of iBFT. */
549         if (ibft_addr->revision != 1) {
550                 printk(KERN_ERR "iBFT module supports only revision 1, " \
551                                 "while this is %d.\n", ibft_addr->revision);
552                 return -ENOENT;
553         }
554         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
555                 csum += *pos;
556
557         if (csum) {
558                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
559                 return -ENOENT;
560         }
561
562         return 0;
563 }
564
565 /*
566  * Helper function for ibft_register_kobjects.
567  */
568 static int __init ibft_create_kobject(struct ibft_table_header *header,
569                                        struct ibft_hdr *hdr,
570                                        struct list_head *list)
571 {
572         struct ibft_kobject *ibft_kobj = NULL;
573         struct ibft_nic *nic = (struct ibft_nic *)hdr;
574         struct pci_dev *pci_dev;
575         int rc = 0;
576
577         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
578         if (!ibft_kobj)
579                 return -ENOMEM;
580
581         ibft_kobj->header = header;
582         ibft_kobj->hdr = hdr;
583
584         switch (hdr->id) {
585         case id_initiator:
586                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
587                                      sizeof(*ibft_kobj->initiator));
588                 break;
589         case id_nic:
590                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
591                                      sizeof(*ibft_kobj->nic));
592                 break;
593         case id_target:
594                 rc = ibft_verify_hdr("target", hdr, id_target,
595                                      sizeof(*ibft_kobj->tgt));
596                 break;
597         case id_reserved:
598         case id_control:
599         case id_extensions:
600                 /* Fields which we don't support. Ignore them */
601                 rc = 1;
602                 break;
603         default:
604                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
605                                 "Report this bug to %.6s!\n", hdr->id,
606                                 header->oem_id);
607                 rc = 1;
608                 break;
609         }
610
611         if (rc) {
612                 /* Skip adding this kobject, but exit with non-fatal error. */
613                 kfree(ibft_kobj);
614                 goto out_invalid_struct;
615         }
616
617         ibft_kobj->kobj.kset = ibft_kset;
618
619         rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
620                                   NULL, ibft_id_names[hdr->id], hdr->index);
621
622         if (rc) {
623                 kfree(ibft_kobj);
624                 goto out;
625         }
626
627         kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
628
629         if (hdr->id == id_nic) {
630                 /*
631                 * We don't search for the device in other domains than
632                 * zero. This is because on x86 platforms the BIOS
633                 * executes only devices which are in domain 0. Furthermore, the
634                 * iBFT spec doesn't have a domain id field :-(
635                 */
636                 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
637                                                (nic->pci_bdf & 0xff));
638                 if (pci_dev) {
639                         rc = sysfs_create_link(&ibft_kobj->kobj,
640                                                &pci_dev->dev.kobj, "device");
641                         pci_dev_put(pci_dev);
642                 }
643         }
644
645         /* Nothing broke so lets add it to the list. */
646         list_add_tail(&ibft_kobj->node, list);
647 out:
648         return rc;
649 out_invalid_struct:
650         /* Unsupported structs are skipped. */
651         return 0;
652 }
653
654 /*
655  * Scan the IBFT table structure for the NIC and Target fields. When
656  * found add them on the passed-in list. We do not support the other
657  * fields at this point, so they are skipped.
658  */
659 static int __init ibft_register_kobjects(struct ibft_table_header *header,
660                                           struct list_head *list)
661 {
662         struct ibft_control *control = NULL;
663         void *ptr, *end;
664         int rc = 0;
665         u16 offset;
666         u16 eot_offset;
667
668         control = (void *)header + sizeof(*header);
669         end = (void *)control + control->hdr.length;
670         eot_offset = (void *)header + header->length - (void *)control;
671         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
672                              sizeof(*control));
673
674         /* iBFT table safety checking */
675         rc |= ((control->hdr.index) ? -ENODEV : 0);
676         if (rc) {
677                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
678                 return rc;
679         }
680         for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
681                 offset = *(u16 *)ptr;
682                 if (offset && offset < header->length && offset < eot_offset) {
683                         rc = ibft_create_kobject(header,
684                                                  (void *)header + offset,
685                                                  list);
686                         if (rc)
687                                 break;
688                 }
689         }
690
691         return rc;
692 }
693
694 static void ibft_unregister(struct list_head *attr_list,
695                              struct list_head *kobj_list)
696 {
697         struct ibft_kobject *data = NULL, *n;
698         struct ibft_attribute *attr = NULL, *m;
699
700         list_for_each_entry_safe(attr, m, attr_list, node) {
701                 sysfs_remove_file(attr->kobj, &attr->attr);
702                 list_del(&attr->node);
703                 kfree(attr);
704         };
705         list_del_init(attr_list);
706
707         list_for_each_entry_safe(data, n, kobj_list, node) {
708                 list_del(&data->node);
709                 if (data->hdr->id == id_nic)
710                         sysfs_remove_link(&data->kobj, "device");
711                 kobject_put(&data->kobj);
712         };
713         list_del_init(kobj_list);
714 }
715
716 static int __init ibft_create_attribute(struct ibft_kobject *kobj_data,
717                                          int type,
718                                          const char *name,
719                                          ssize_t (*show)(struct ibft_kobject *,
720                                                          struct ibft_attribute*,
721                                                          char *buf),
722                                          struct list_head *list)
723 {
724         struct ibft_attribute *attr = NULL;
725         struct ibft_hdr *hdr = kobj_data->hdr;
726
727         attr = kmalloc(sizeof(*attr), GFP_KERNEL);
728         if (!attr)
729                 return -ENOMEM;
730
731         attr->attr.name = name;
732         attr->attr.mode = S_IRUSR;
733
734         attr->hdr = hdr;
735         attr->show = show;
736         attr->kobj = &kobj_data->kobj;
737         attr->type = type;
738
739         list_add_tail(&attr->node, list);
740
741         return 0;
742 }
743
744 /*
745  * Helper routiners to check to determine if the entry is valid
746  * in the proper iBFT structure.
747  */
748 static int __init ibft_check_nic_for(struct ibft_nic *nic, int entry)
749 {
750         int rc = 0;
751
752         switch (entry) {
753         case ibft_eth_index:
754         case ibft_eth_flags:
755                 rc = 1;
756                 break;
757         case ibft_eth_ip_addr:
758                 if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
759                         rc = 1;
760                 break;
761         case ibft_eth_subnet_mask:
762                 if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
763                         rc = 1;
764                 break;
765         case ibft_eth_origin:
766                 rc = 1;
767                 break;
768         case ibft_eth_gateway:
769                 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
770                         rc = 1;
771                 break;
772         case ibft_eth_primary_dns:
773                 if (memcmp(nic->primary_dns, nulls,
774                            sizeof(nic->primary_dns)))
775                         rc = 1;
776                 break;
777         case ibft_eth_secondary_dns:
778                 if (memcmp(nic->secondary_dns, nulls,
779                            sizeof(nic->secondary_dns)))
780                         rc = 1;
781                 break;
782         case ibft_eth_dhcp:
783                 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
784                         rc = 1;
785                 break;
786         case ibft_eth_vlan:
787         case ibft_eth_mac:
788                 rc = 1;
789                 break;
790         case ibft_eth_hostname:
791                 if (nic->hostname_off)
792                         rc = 1;
793                 break;
794         default:
795                 break;
796         }
797
798         return rc;
799 }
800
801 static int __init ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
802 {
803         int rc = 0;
804
805         switch (entry) {
806         case ibft_tgt_index:
807         case ibft_tgt_flags:
808         case ibft_tgt_ip_addr:
809         case ibft_tgt_port:
810         case ibft_tgt_lun:
811         case ibft_tgt_nic_assoc:
812         case ibft_tgt_chap_type:
813                 rc = 1;
814         case ibft_tgt_name:
815                 if (tgt->tgt_name_len)
816                         rc = 1;
817                 break;
818         case ibft_tgt_chap_name:
819         case ibft_tgt_chap_secret:
820                 if (tgt->chap_name_len)
821                         rc = 1;
822                 break;
823         case ibft_tgt_rev_chap_name:
824         case ibft_tgt_rev_chap_secret:
825                 if (tgt->rev_chap_name_len)
826                         rc = 1;
827                 break;
828         default:
829                 break;
830         }
831
832         return rc;
833 }
834
835 static int __init ibft_check_initiator_for(struct ibft_initiator *init,
836                                             int entry)
837 {
838         int rc = 0;
839
840         switch (entry) {
841         case ibft_init_index:
842         case ibft_init_flags:
843                 rc = 1;
844                 break;
845         case ibft_init_isns_server:
846                 if (memcmp(init->isns_server, nulls,
847                            sizeof(init->isns_server)))
848                         rc = 1;
849                 break;
850         case ibft_init_slp_server:
851                 if (memcmp(init->slp_server, nulls,
852                            sizeof(init->slp_server)))
853                         rc = 1;
854                 break;
855         case ibft_init_pri_radius_server:
856                 if (memcmp(init->pri_radius_server, nulls,
857                            sizeof(init->pri_radius_server)))
858                         rc = 1;
859                 break;
860         case ibft_init_sec_radius_server:
861                 if (memcmp(init->sec_radius_server, nulls,
862                            sizeof(init->sec_radius_server)))
863                         rc = 1;
864                 break;
865         case ibft_init_initiator_name:
866                 if (init->initiator_name_len)
867                         rc = 1;
868                 break;
869         default:
870                 break;
871         }
872
873         return rc;
874 }
875
876 /*
877  *  Register the attributes for all of the kobjects.
878  */
879 static int __init ibft_register_attributes(struct list_head *kobject_list,
880                                             struct list_head *attr_list)
881 {
882         int rc = 0, i = 0;
883         struct ibft_kobject *data = NULL;
884         struct ibft_attribute *attr = NULL, *m;
885
886         list_for_each_entry(data, kobject_list, node) {
887                 switch (data->hdr->id) {
888                 case id_nic:
889                         for (i = 0; i < ibft_eth_end_marker && !rc; i++)
890                                 if (ibft_check_nic_for(data->nic, i))
891                                         rc = ibft_create_attribute(data, i,
892                                                 ibft_eth_properties[i],
893                                                 ibft_attr_show_nic, attr_list);
894                         break;
895                 case id_target:
896                         for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
897                                 if (ibft_check_tgt_for(data->tgt, i))
898                                         rc = ibft_create_attribute(data, i,
899                                                 ibft_tgt_properties[i],
900                                                 ibft_attr_show_target,
901                                                 attr_list);
902                         break;
903                 case id_initiator:
904                         for (i = 0; i < ibft_init_end_marker && !rc; i++)
905                                 if (ibft_check_initiator_for(
906                                         data->initiator, i))
907                                         rc = ibft_create_attribute(data, i,
908                                                 ibft_initiator_properties[i],
909                                                 ibft_attr_show_initiator,
910                                                 attr_list);
911                         break;
912                 default:
913                         break;
914                 }
915                 if (rc)
916                         break;
917         }
918         list_for_each_entry_safe(attr, m, attr_list, node) {
919                 rc = sysfs_create_file(attr->kobj, &attr->attr);
920                 if (rc) {
921                         list_del(&attr->node);
922                         kfree(attr);
923                         break;
924                 }
925         }
926
927         return rc;
928 }
929
930 /*
931  * ibft_init() - creates sysfs tree entries for the iBFT data.
932  */
933 static int __init ibft_init(void)
934 {
935         int rc = 0;
936
937         ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
938         if (!ibft_kset)
939                 return -ENOMEM;
940
941         if (ibft_addr) {
942                 printk(KERN_INFO "iBFT detected at 0x%lx.\n",
943                        virt_to_phys((void *)ibft_addr));
944
945                 rc = ibft_check_device();
946                 if (rc)
947                         goto out_firmware_unregister;
948
949                 /* Scan the IBFT for data and register the kobjects. */
950                 rc = ibft_register_kobjects(ibft_addr, &ibft_kobject_list);
951                 if (rc)
952                         goto out_free;
953
954                 /* Register the attributes */
955                 rc = ibft_register_attributes(&ibft_kobject_list,
956                                               &ibft_attr_list);
957                 if (rc)
958                         goto out_free;
959         } else
960                 printk(KERN_INFO "No iBFT detected.\n");
961
962         return 0;
963
964 out_free:
965         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
966 out_firmware_unregister:
967         kset_unregister(ibft_kset);
968         return rc;
969 }
970
971 static void __exit ibft_exit(void)
972 {
973         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
974         kset_unregister(ibft_kset);
975 }
976
977 module_init(ibft_init);
978 module_exit(ibft_exit);