SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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, "%p6", 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);