drivers/firmware/iscsi_ibft.c

   1 /*
   2  *  Copyright 2007 Red Hat, Inc.
   3  *  by Peter Jones <pjones@redhat.com>
   4  *  Copyright 2008 IBM, Inc.
   5  *  by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   6  *  Copyright 2008
   7  *  by Konrad Rzeszutek <ketuzsezr@darnok.org>
   8  *
   9  * This code exposes the iSCSI Boot Format Table to userland via sysfs.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License v2.0 as published by
  13  * the Free Software Foundation
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * Changelog:
  21  *
  22  *  14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
  23  *    Updated comments and copyrights. (v0.4.9)
  24  *
  25  *  11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  26  *    Converted to using ibft_addr. (v0.4.8)
  27  *
  28  *   8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  29  *    Combined two functions in one: reserve_ibft_region. (v0.4.7)
  30  *
  31  *  30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  32  *   Added logic to handle IPv6 addresses. (v0.4.6)
  33  *
  34  *  25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  35  *   Added logic to handle badly not-to-spec iBFT. (v0.4.5)
  36  *
  37  *   4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  38  *   Added __init to function declarations. (v0.4.4)
  39  *
  40  *  21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  41  *   Updated kobject registration, combined unregister functions in one
  42  *   and code and style cleanup. (v0.4.3)
  43  *
  44  *   5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  45  *   Added end-markers to enums and re-organized kobject registration. (v0.4.2)
  46  *
  47  *   4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  48  *   Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
  49  *
  50  *  28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  51  *   Added sysfs-ibft documentation, moved 'find_ibft' function to
  52  *   in its own file and added text attributes for every struct field.  (v0.4)
  53  *
  54  *  21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  55  *   Added text attributes emulating OpenFirmware /proc/device-tree naming.
  56  *   Removed binary /sysfs interface (v0.3)
  57  *
  58  *  29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  59  *   Added functionality in setup.c to reserve iBFT region. (v0.2)
  60  *
  61  *  27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  62  *   First version exposing iBFT data via a binary /sysfs. (v0.1)
  63  *
  64  */
  65
  66
  67 #include <linux/blkdev.h>
  68 #include <linux/capability.h>
  69 #include <linux/ctype.h>
  70 #include <linux/device.h>
  71 #include <linux/err.h>
  72 #include <linux/init.h>
  73 #include <linux/iscsi_ibft.h>
  74 #include <linux/limits.h>
  75 #include <linux/module.h>
  76 #include <linux/pci.h>
  77 #include <linux/slab.h>
  78 #include <linux/stat.h>
  79 #include <linux/string.h>
  80 #include <linux/types.h>
  81
  82 #define IBFT_ISCSI_VERSION "0.4.9"
  83 #define IBFT_ISCSI_DATE "2008-Mar-14"
  84
  85 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and \
  86 Konrad Rzeszutek <ketuzsezr@darnok.org>");
  87 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
  88 MODULE_LICENSE("GPL");
  89 MODULE_VERSION(IBFT_ISCSI_VERSION);
  90
  91 struct ibft_hdr {
  92         u8 id;
  93         u8 version;
  94         u16 length;
  95         u8 index;
  96         u8 flags;
  97 } __attribute__((__packed__));
  98
  99 struct ibft_control {
 100         struct ibft_hdr hdr;
 101         u16 extensions;
 102         u16 initiator_off;
 103         u16 nic0_off;
 104         u16 tgt0_off;
 105         u16 nic1_off;
 106         u16 tgt1_off;
 107 } __attribute__((__packed__));
 108
 109 struct ibft_initiator {
 110         struct ibft_hdr hdr;
 111         char isns_server[16];
 112         char slp_server[16];
 113         char pri_radius_server[16];
 114         char sec_radius_server[16];
 115         u16 initiator_name_len;
 116         u16 initiator_name_off;
 117 } __attribute__((__packed__));
 118
 119 struct ibft_nic {
 120         struct ibft_hdr hdr;
 121         char ip_addr[16];
 122         u8 subnet_mask_prefix;
 123         u8 origin;
 124         char gateway[16];
 125         char primary_dns[16];
 126         char secondary_dns[16];
 127         char dhcp[16];
 128         u16 vlan;
 129         char mac[6];
 130         u16 pci_bdf;
 131         u16 hostname_len;
 132         u16 hostname_off;
 133 } __attribute__((__packed__));
 134
 135 struct ibft_tgt {
 136         struct ibft_hdr hdr;
 137         char ip_addr[16];
 138         u16 port;
 139         char lun[8];
 140         u8 chap_type;
 141         u8 nic_assoc;
 142         u16 tgt_name_len;
 143         u16 tgt_name_off;
 144         u16 chap_name_len;
 145         u16 chap_name_off;
 146         u16 chap_secret_len;
 147         u16 chap_secret_off;
 148         u16 rev_chap_name_len;
 149         u16 rev_chap_name_off;
 150         u16 rev_chap_secret_len;
 151         u16 rev_chap_secret_off;
 152 } __attribute__((__packed__));
 153
 154 /*
 155  * The kobject different types and its names.
 156  *
 157 */
 158 enum ibft_id {
 159         id_reserved = 0, /* We don't support. */
 160         id_control = 1, /* Should show up only once and is not exported. */
 161         id_initiator = 2,
 162         id_nic = 3,
 163         id_target = 4,
 164         id_extensions = 5, /* We don't support. */
 165         id_end_marker,
 166 };
 167
 168 /*
 169  * We do not support the other types, hence the usage of NULL.
 170  * This maps to the enum ibft_id.
 171  */
 172 static const char *ibft_id_names[] =
 173         {NULL, NULL, "initiator", "ethernet%d", "target%d", NULL, NULL};
 174
 175 /*
 176  * The text attributes names for each of the kobjects.
 177 */
 178 enum ibft_eth_properties_enum {
 179         ibft_eth_index,
 180         ibft_eth_flags,
 181         ibft_eth_ip_addr,
 182         ibft_eth_subnet_mask,
 183         ibft_eth_origin,
 184         ibft_eth_gateway,
 185         ibft_eth_primary_dns,
 186         ibft_eth_secondary_dns,
 187         ibft_eth_dhcp,
 188         ibft_eth_vlan,
 189         ibft_eth_mac,
 190         /* ibft_eth_pci_bdf - this is replaced by link to the device itself. */
 191         ibft_eth_hostname,
 192         ibft_eth_end_marker,
 193 };
 194
 195 static const char *ibft_eth_properties[] =
 196         {"index", "flags", "ip-addr", "subnet-mask", "origin", "gateway",
 197         "primary-dns", "secondary-dns", "dhcp", "vlan", "mac", "hostname",
 198         NULL};
 199
 200 enum ibft_tgt_properties_enum {
 201         ibft_tgt_index,
 202         ibft_tgt_flags,
 203         ibft_tgt_ip_addr,
 204         ibft_tgt_port,
 205         ibft_tgt_lun,
 206         ibft_tgt_chap_type,
 207         ibft_tgt_nic_assoc,
 208         ibft_tgt_name,
 209         ibft_tgt_chap_name,
 210         ibft_tgt_chap_secret,
 211         ibft_tgt_rev_chap_name,
 212         ibft_tgt_rev_chap_secret,
 213         ibft_tgt_end_marker,
 214 };
 215
 216 static const char *ibft_tgt_properties[] =
 217         {"index", "flags", "ip-addr", "port", "lun", "chap-type", "nic-assoc",
 218         "target-name", "chap-name", "chap-secret", "rev-chap-name",
 219         "rev-chap-name-secret", NULL};
 220
 221 enum ibft_initiator_properties_enum {
 222         ibft_init_index,
 223         ibft_init_flags,
 224         ibft_init_isns_server,
 225         ibft_init_slp_server,
 226         ibft_init_pri_radius_server,
 227         ibft_init_sec_radius_server,
 228         ibft_init_initiator_name,
 229         ibft_init_end_marker,
 230 };
 231
 232 static const char *ibft_initiator_properties[] =
 233         {"index", "flags", "isns-server", "slp-server", "pri-radius-server",
 234         "sec-radius-server", "initiator-name", NULL};
 235
 236 /*
 237  * The kobject and attribute structures.
 238  */
 239
 240 struct ibft_kobject {
 241         struct ibft_table_header *header;
 242         union {
 243                 struct ibft_initiator *initiator;
 244                 struct ibft_nic *nic;
 245                 struct ibft_tgt *tgt;
 246                 struct ibft_hdr *hdr;
 247         };
 248         struct kobject kobj;
 249         struct list_head node;
 250 };
 251
 252 struct ibft_attribute {
 253         struct attribute attr;
 254         ssize_t (*show) (struct  ibft_kobject *entry,
 255                          struct ibft_attribute *attr, char *buf);
 256         union {
 257                 struct ibft_initiator *initiator;
 258                 struct ibft_nic *nic;
 259                 struct ibft_tgt *tgt;
 260                 struct ibft_hdr *hdr;
 261         };
 262         struct kobject *kobj;
 263         int type; /* The enum of the type. This can be any value of:
 264                 ibft_eth_properties_enum, ibft_tgt_properties_enum,
 265                 or ibft_initiator_properties_enum. */
 266         struct list_head node;
 267 };
 268
 269 static LIST_HEAD(ibft_attr_list);
 270 static LIST_HEAD(ibft_kobject_list);
 271
 272 static const char nulls[16];
 273
 274 /*
 275  * Helper functions to parse data properly.
 276  */
 277 static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
 278 {
 279         char *str = buf;
 280
 281         if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
 282             ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
 283             ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
 284                 /*
 285                  * IPV4
 286                  */
 287                 str += sprintf(buf, NIPQUAD_FMT, ip[12],
 288                                ip[13], ip[14], ip[15]);
 289         } else {
 290                 /*
 291                  * IPv6
 292                  */
 293                 str += sprintf(str, NIP6_FMT, ntohs(ip[0]), ntohs(ip[1]),
 294                                ntohs(ip[2]), ntohs(ip[3]), ntohs(ip[4]),
 295                                ntohs(ip[5]), ntohs(ip[6]), ntohs(ip[7]));
 296         }
 297         str += sprintf(str, "\n");
 298         return str - buf;
 299 }
 300
 301 static ssize_t sprintf_string(char *str, int len, char *buf)
 302 {
 303         return sprintf(str, "%.*s\n", len, buf);
 304 }
 305
 306 /*
 307  * Helper function to verify the IBFT header.
 308  */
 309 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
 310 {
 311         if (hdr->id != id) {
 312                 printk(KERN_ERR "iBFT error: We expected the " \
 313                                 "field header.id to have %d but " \
 314                                 "found %d instead!\n", id, hdr->id);
 315                 return -ENODEV;
 316         }
 317         if (hdr->length != length) {
 318                 printk(KERN_ERR "iBFT error: We expected the " \
 319                                 "field header.length to have %d but " \
 320                                 "found %d instead!\n", length, hdr->length);
 321                 return -ENODEV;
 322         }
 323
 324         return 0;
 325 }
 326
 327 static void ibft_release(struct kobject *kobj)
 328 {
 329         struct ibft_kobject *ibft =
 330                 container_of(kobj, struct ibft_kobject, kobj);
 331         kfree(ibft);
 332 }
 333
 334 /*
 335  *  Routines for parsing the iBFT data to be human readable.
 336  */
 337 static ssize_t ibft_attr_show_initiator(struct ibft_kobject *entry,
 338                                         struct ibft_attribute *attr,
 339                                         char *buf)
 340 {
 341         struct ibft_initiator *initiator = entry->initiator;
 342         void *ibft_loc = entry->header;
 343         char *str = buf;
 344
 345         if (!initiator)
 346                 return 0;
 347
 348         switch (attr->type) {
 349         case ibft_init_index:
 350                 str += sprintf(str, "%d\n", initiator->hdr.index);
 351                 break;
 352         case ibft_init_flags:
 353                 str += sprintf(str, "%d\n", initiator->hdr.flags);
 354                 break;
 355         case ibft_init_isns_server:
 356                 str += sprintf_ipaddr(str, initiator->isns_server);
 357                 break;
 358         case ibft_init_slp_server:
 359                 str += sprintf_ipaddr(str, initiator->slp_server);
 360                 break;
 361         case ibft_init_pri_radius_server:
 362                 str += sprintf_ipaddr(str, initiator->pri_radius_server);
 363                 break;
 364         case ibft_init_sec_radius_server:
 365                 str += sprintf_ipaddr(str, initiator->sec_radius_server);
 366                 break;
 367         case ibft_init_initiator_name:
 368                 str += sprintf_string(str, initiator->initiator_name_len,
 369                                       (char *)ibft_loc +
 370                                       initiator->initiator_name_off);
 371                 break;
 372         default:
 373                 break;
 374         }
 375
 376         return str - buf;
 377 }
 378
 379 static ssize_t ibft_attr_show_nic(struct ibft_kobject *entry,
 380                                   struct ibft_attribute *attr,
 381                                   char *buf)
 382 {
 383         struct ibft_nic *nic = entry->nic;
 384         void *ibft_loc = entry->header;
 385         char *str = buf;
 386         char *mac;
 387         int val;
 388
 389         if (!nic)
 390                 return 0;
 391
 392         switch (attr->type) {
 393         case ibft_eth_index:
 394                 str += sprintf(str, "%d\n", nic->hdr.index);
 395                 break;
 396         case ibft_eth_flags:
 397                 str += sprintf(str, "%d\n", nic->hdr.flags);
 398                 break;
 399         case ibft_eth_ip_addr:
 400                 str += sprintf_ipaddr(str, nic->ip_addr);
 401                 break;
 402         case ibft_eth_subnet_mask:
 403                 val = ~((1 << (32-nic->subnet_mask_prefix))-1);
 404                 str += sprintf(str, NIPQUAD_FMT,
 405                                (u8)(val >> 24), (u8)(val >> 16),
 406                                (u8)(val >> 8), (u8)(val));
 407                 break;
 408         case ibft_eth_origin:
 409                 str += sprintf(str, "%d\n", nic->origin);
 410                 break;
 411         case ibft_eth_gateway:
 412                 str += sprintf_ipaddr(str, nic->gateway);
 413                 break;
 414         case ibft_eth_primary_dns:
 415                 str += sprintf_ipaddr(str, nic->primary_dns);
 416                 break;
 417         case ibft_eth_secondary_dns:
 418                 str += sprintf_ipaddr(str, nic->secondary_dns);
 419                 break;
 420         case ibft_eth_dhcp:
 421                 str += sprintf_ipaddr(str, nic->dhcp);
 422                 break;
 423         case ibft_eth_vlan:
 424                 str += sprintf(str, "%d\n", nic->vlan);
 425                 break;
 426         case ibft_eth_mac:
 427                 mac = nic->mac;
 428                 str += sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n",
 429                                (u8)mac[0], (u8)mac[1], (u8)mac[2],
 430                                (u8)mac[3], (u8)mac[4], (u8)mac[5]);
 431                 break;
 432         case ibft_eth_hostname:
 433                 str += sprintf_string(str, nic->hostname_len,
 434                                       (char *)ibft_loc + nic->hostname_off);
 435                 break;
 436         default:
 437                 break;
 438         }
 439
 440         return str - buf;
 441 };
 442
 443 static ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
 444                                      struct ibft_attribute *attr,
 445                                      char *buf)
 446 {
 447         struct ibft_tgt *tgt = entry->tgt;
 448         void *ibft_loc = entry->header;
 449         char *str = buf;
 450         int i;
 451
 452         if (!tgt)
 453                 return 0;
 454
 455         switch (attr->type) {
 456         case ibft_tgt_index:
 457                 str += sprintf(str, "%d\n", tgt->hdr.index);
 458                 break;
 459         case ibft_tgt_flags:
 460                 str += sprintf(str, "%d\n", tgt->hdr.flags);
 461                 break;
 462         case ibft_tgt_ip_addr:
 463                 str += sprintf_ipaddr(str, tgt->ip_addr);
 464                 break;
 465         case ibft_tgt_port:
 466                 str += sprintf(str, "%d\n", tgt->port);
 467                 break;
 468         case ibft_tgt_lun:
 469                 for (i = 0; i < 8; i++)
 470                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
 471                 str += sprintf(str, "\n");
 472                 break;
 473         case ibft_tgt_nic_assoc:
 474                 str += sprintf(str, "%d\n", tgt->nic_assoc);
 475                 break;
 476         case ibft_tgt_chap_type:
 477                 str += sprintf(str, "%d\n", tgt->chap_type);
 478                 break;
 479         case ibft_tgt_name:
 480                 str += sprintf_string(str, tgt->tgt_name_len,
 481                                       (char *)ibft_loc + tgt->tgt_name_off);
 482                 break;
 483         case ibft_tgt_chap_name:
 484                 str += sprintf_string(str, tgt->chap_name_len,
 485                                       (char *)ibft_loc + tgt->chap_name_off);
 486                 break;
 487         case ibft_tgt_chap_secret:
 488                 str += sprintf_string(str, tgt->chap_secret_len,
 489                                       (char *)ibft_loc + tgt->chap_secret_off);
 490                 break;
 491         case ibft_tgt_rev_chap_name:
 492                 str += sprintf_string(str, tgt->rev_chap_name_len,
 493                                       (char *)ibft_loc +
 494                                       tgt->rev_chap_name_off);
 495                 break;
 496         case ibft_tgt_rev_chap_secret:
 497                 str += sprintf_string(str, tgt->rev_chap_secret_len,
 498                                       (char *)ibft_loc +
 499                                       tgt->rev_chap_secret_off);
 500                 break;
 501         default:
 502                 break;
 503         }
 504
 505         return str - buf;
 506 }
 507
 508 /*
 509  * The routine called for all sysfs attributes.
 510  */
 511 static ssize_t ibft_show_attribute(struct kobject *kobj,
 512                                     struct attribute *attr,
 513                                     char *buf)
 514 {
 515         struct ibft_kobject *dev =
 516                 container_of(kobj, struct ibft_kobject, kobj);
 517         struct ibft_attribute *ibft_attr =
 518                 container_of(attr, struct ibft_attribute, attr);
 519         ssize_t ret = -EIO;
 520         char *str = buf;
 521
 522         if (!capable(CAP_SYS_ADMIN))
 523                 return -EACCES;
 524
 525         if (ibft_attr->show)
 526                 ret = ibft_attr->show(dev, ibft_attr, str);
 527
 528         return ret;
 529 }
 530
 531 static struct sysfs_ops ibft_attr_ops = {
 532         .show = ibft_show_attribute,
 533 };
 534
 535 static struct kobj_type ibft_ktype = {
 536         .release = ibft_release,
 537         .sysfs_ops = &ibft_attr_ops,
 538 };
 539
 540 static struct kset *ibft_kset;
 541
 542 static int __init ibft_check_device(void)
 543 {
 544         int len;
 545         u8 *pos;
 546         u8 csum = 0;
 547
 548         len = ibft_addr->length;
 549
 550         /* Sanity checking of iBFT. */
 551         if (ibft_addr->revision != 1) {
 552                 printk(KERN_ERR "iBFT module supports only revision 1, " \
 553                                 "while this is %d.\n", ibft_addr->revision);
 554                 return -ENOENT;
 555         }
 556         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
 557                 csum += *pos;
 558
 559         if (csum) {
 560                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
 561                 return -ENOENT;
 562         }
 563
 564         return 0;
 565 }
 566
 567 /*
 568  * Helper function for ibft_register_kobjects.
 569  */
 570 static int __init ibft_create_kobject(struct ibft_table_header *header,
 571                                        struct ibft_hdr *hdr,
 572                                        struct list_head *list)
 573 {
 574         struct ibft_kobject *ibft_kobj = NULL;
 575         struct ibft_nic *nic = (struct ibft_nic *)hdr;
 576         struct pci_dev *pci_dev;
 577         int rc = 0;
 578
 579         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
 580         if (!ibft_kobj)
 581                 return -ENOMEM;
 582
 583         ibft_kobj->header = header;
 584         ibft_kobj->hdr = hdr;
 585
 586         switch (hdr->id) {
 587         case id_initiator:
 588                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
 589                                      sizeof(*ibft_kobj->initiator));
 590                 break;
 591         case id_nic:
 592                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
 593                                      sizeof(*ibft_kobj->nic));
 594                 break;
 595         case id_target:
 596                 rc = ibft_verify_hdr("target", hdr, id_target,
 597                                      sizeof(*ibft_kobj->tgt));
 598                 break;
 599         case id_reserved:
 600         case id_control:
 601         case id_extensions:
 602                 /* Fields which we don't support. Ignore them */
 603                 rc = 1;
 604                 break;
 605         default:
 606                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
 607                                 "Report this bug to %.6s!\n", hdr->id,
 608                                 header->oem_id);
 609                 rc = 1;
 610                 break;
 611         }
 612
 613         if (rc) {
 614                 /* Skip adding this kobject, but exit with non-fatal error. */
 615                 kfree(ibft_kobj);
 616                 goto out_invalid_struct;
 617         }
 618
 619         ibft_kobj->kobj.kset = ibft_kset;
 620
 621         rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
 622                                   NULL, ibft_id_names[hdr->id], hdr->index);
 623
 624         if (rc) {
 625                 kfree(ibft_kobj);
 626                 goto out;
 627         }
 628
 629         kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
 630
 631         if (hdr->id == id_nic) {
 632                 /*
 633                 * We don't search for the device in other domains than
 634                 * zero. This is because on x86 platforms the BIOS
 635                 * executes only devices which are in domain 0. Furthermore, the
 636                 * iBFT spec doesn't have a domain id field :-(
 637                 */
 638                 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
 639                                                (nic->pci_bdf & 0xff));
 640                 if (pci_dev) {
 641                         rc = sysfs_create_link(&ibft_kobj->kobj,
 642                                                &pci_dev->dev.kobj, "device");
 643                         pci_dev_put(pci_dev);
 644                 }
 645         }
 646
 647         /* Nothing broke so lets add it to the list. */
 648         list_add_tail(&ibft_kobj->node, list);
 649 out:
 650         return rc;
 651 out_invalid_struct:
 652         /* Unsupported structs are skipped. */
 653         return 0;
 654 }
 655
 656 /*
 657  * Scan the IBFT table structure for the NIC and Target fields. When
 658  * found add them on the passed-in list. We do not support the other
 659  * fields at this point, so they are skipped.
 660  */
 661 static int __init ibft_register_kobjects(struct ibft_table_header *header,
 662                                           struct list_head *list)
 663 {
 664         struct ibft_control *control = NULL;
 665         void *ptr, *end;
 666         int rc = 0;
 667         u16 offset;
 668         u16 eot_offset;
 669
 670         control = (void *)header + sizeof(*header);
 671         end = (void *)control + control->hdr.length;
 672         eot_offset = (void *)header + header->length - (void *)control;
 673         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
 674                              sizeof(*control));
 675
 676         /* iBFT table safety checking */
 677         rc |= ((control->hdr.index) ? -ENODEV : 0);
 678         if (rc) {
 679                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
 680                 return rc;
 681         }
 682         for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
 683                 offset = *(u16 *)ptr;
 684                 if (offset && offset < header->length && offset < eot_offset) {
 685                         rc = ibft_create_kobject(header,
 686                                                  (void *)header + offset,
 687                                                  list);
 688                         if (rc)
 689                                 break;
 690                 }
 691         }
 692
 693         return rc;
 694 }
 695
 696 static void ibft_unregister(struct list_head *attr_list,
 697                              struct list_head *kobj_list)
 698 {
 699         struct ibft_kobject *data = NULL, *n;
 700         struct ibft_attribute *attr = NULL, *m;
 701
 702         list_for_each_entry_safe(attr, m, attr_list, node) {
 703                 sysfs_remove_file(attr->kobj, &attr->attr);
 704                 list_del(&attr->node);
 705                 kfree(attr);
 706         };
 707         list_del_init(attr_list);
 708
 709         list_for_each_entry_safe(data, n, kobj_list, node) {
 710                 list_del(&data->node);
 711                 if (data->hdr->id == id_nic)
 712                         sysfs_remove_link(&data->kobj, "device");
 713                 kobject_put(&data->kobj);
 714         };
 715         list_del_init(kobj_list);
 716 }
 717
 718 static int __init ibft_create_attribute(struct ibft_kobject *kobj_data,
 719                                          int type,
 720                                          const char *name,
 721                                          ssize_t (*show)(struct ibft_kobject *,
 722                                                          struct ibft_attribute*,
 723                                                          char *buf),
 724                                          struct list_head *list)
 725 {
 726         struct ibft_attribute *attr = NULL;
 727         struct ibft_hdr *hdr = kobj_data->hdr;
 728
 729         attr = kmalloc(sizeof(*attr), GFP_KERNEL);
 730         if (!attr)
 731                 return -ENOMEM;
 732
 733         attr->attr.name = name;
 734         attr->attr.mode = S_IRUSR;
 735
 736         attr->hdr = hdr;
 737         attr->show = show;
 738         attr->kobj = &kobj_data->kobj;
 739         attr->type = type;
 740
 741         list_add_tail(&attr->node, list);
 742
 743         return 0;
 744 }
 745
 746 /*
 747  * Helper routiners to check to determine if the entry is valid
 748  * in the proper iBFT structure.
 749  */
 750 static int __init ibft_check_nic_for(struct ibft_nic *nic, int entry)
 751 {
 752         int rc = 0;
 753
 754         switch (entry) {
 755         case ibft_eth_index:
 756         case ibft_eth_flags:
 757                 rc = 1;
 758                 break;
 759         case ibft_eth_ip_addr:
 760                 if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
 761                         rc = 1;
 762                 break;
 763         case ibft_eth_subnet_mask:
 764                 if (!memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
 765                         rc = 1;
 766                 break;
 767         case ibft_eth_origin:
 768                 rc = 1;
 769                 break;
 770         case ibft_eth_gateway:
 771                 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
 772                         rc = 1;
 773                 break;
 774         case ibft_eth_primary_dns:
 775                 if (memcmp(nic->primary_dns, nulls,
 776                            sizeof(nic->primary_dns)))
 777                         rc = 1;
 778                 break;
 779         case ibft_eth_secondary_dns:
 780                 if (memcmp(nic->secondary_dns, nulls,
 781                            sizeof(nic->secondary_dns)))
 782                         rc = 1;
 783                 break;
 784         case ibft_eth_dhcp:
 785                 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
 786                         rc = 1;
 787                 break;
 788         case ibft_eth_vlan:
 789         case ibft_eth_mac:
 790                 rc = 1;
 791                 break;
 792         case ibft_eth_hostname:
 793                 if (nic->hostname_off)
 794                         rc = 1;
 795                 break;
 796         default:
 797                 break;
 798         }
 799
 800         return rc;
 801 }
 802
 803 static int __init ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
 804 {
 805         int rc = 0;
 806
 807         switch (entry) {
 808         case ibft_tgt_index:
 809         case ibft_tgt_flags:
 810         case ibft_tgt_ip_addr:
 811         case ibft_tgt_port:
 812         case ibft_tgt_lun:
 813         case ibft_tgt_nic_assoc:
 814         case ibft_tgt_chap_type:
 815                 rc = 1;
 816         case ibft_tgt_name:
 817                 if (tgt->tgt_name_len)
 818                         rc = 1;
 819                 break;
 820         case ibft_tgt_chap_name:
 821         case ibft_tgt_chap_secret:
 822                 if (tgt->chap_name_len)
 823                         rc = 1;
 824                 break;
 825         case ibft_tgt_rev_chap_name:
 826         case ibft_tgt_rev_chap_secret:
 827                 if (tgt->rev_chap_name_len)
 828                         rc = 1;
 829                 break;
 830         default:
 831                 break;
 832         }
 833
 834         return rc;
 835 }
 836
 837 static int __init ibft_check_initiator_for(struct ibft_initiator *init,
 838                                             int entry)
 839 {
 840         int rc = 0;
 841
 842         switch (entry) {
 843         case ibft_init_index:
 844         case ibft_init_flags:
 845                 rc = 1;
 846                 break;
 847         case ibft_init_isns_server:
 848                 if (memcmp(init->isns_server, nulls,
 849                            sizeof(init->isns_server)))
 850                         rc = 1;
 851                 break;
 852         case ibft_init_slp_server:
 853                 if (memcmp(init->slp_server, nulls,
 854                            sizeof(init->slp_server)))
 855                         rc = 1;
 856                 break;
 857         case ibft_init_pri_radius_server:
 858                 if (memcmp(init->pri_radius_server, nulls,
 859                            sizeof(init->pri_radius_server)))
 860                         rc = 1;
 861                 break;
 862         case ibft_init_sec_radius_server:
 863                 if (memcmp(init->sec_radius_server, nulls,
 864                            sizeof(init->sec_radius_server)))
 865                         rc = 1;
 866                 break;
 867         case ibft_init_initiator_name:
 868                 if (init->initiator_name_len)
 869                         rc = 1;
 870                 break;
 871         default:
 872                 break;
 873         }
 874
 875         return rc;
 876 }
 877
 878 /*
 879  *  Register the attributes for all of the kobjects.
 880  */
 881 static int __init ibft_register_attributes(struct list_head *kobject_list,
 882                                             struct list_head *attr_list)
 883 {
 884         int rc = 0, i = 0;
 885         struct ibft_kobject *data = NULL;
 886         struct ibft_attribute *attr = NULL, *m;
 887
 888         list_for_each_entry(data, kobject_list, node) {
 889                 switch (data->hdr->id) {
 890                 case id_nic:
 891                         for (i = 0; i < ibft_eth_end_marker && !rc; i++)
 892                                 if (ibft_check_nic_for(data->nic, i))
 893                                         rc = ibft_create_attribute(data, i,
 894                                                 ibft_eth_properties[i],
 895                                                 ibft_attr_show_nic, attr_list);
 896                         break;
 897                 case id_target:
 898                         for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
 899                                 if (ibft_check_tgt_for(data->tgt, i))
 900                                         rc = ibft_create_attribute(data, i,
 901                                                 ibft_tgt_properties[i],
 902                                                 ibft_attr_show_target,
 903                                                 attr_list);
 904                         break;
 905                 case id_initiator:
 906                         for (i = 0; i < ibft_init_end_marker && !rc; i++)
 907                                 if (ibft_check_initiator_for(
 908                                         data->initiator, i))
 909                                         rc = ibft_create_attribute(data, i,
 910                                                 ibft_initiator_properties[i],
 911                                                 ibft_attr_show_initiator,
 912                                                 attr_list);
 913                         break;
 914                 default:
 915                         break;
 916                 }
 917                 if (rc)
 918                         break;
 919         }
 920         list_for_each_entry_safe(attr, m, attr_list, node) {
 921                 rc = sysfs_create_file(attr->kobj, &attr->attr);
 922                 if (rc) {
 923                         list_del(&attr->node);
 924                         kfree(attr);
 925                         break;
 926                 }
 927         }
 928
 929         return rc;
 930 }
 931
 932 /*
 933  * ibft_init() - creates sysfs tree entries for the iBFT data.
 934  */
 935 static int __init ibft_init(void)
 936 {
 937         int rc = 0;
 938
 939         ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
 940         if (!ibft_kset)
 941                 return -ENOMEM;
 942
 943         if (ibft_addr) {
 944                 printk(KERN_INFO "iBFT detected at 0x%lx.\n",
 945                        virt_to_phys((void *)ibft_addr));
 946
 947                 rc = ibft_check_device();
 948                 if (rc)
 949                         goto out_firmware_unregister;
 950
 951                 /* Scan the IBFT for data and register the kobjects. */
 952                 rc = ibft_register_kobjects(ibft_addr, &ibft_kobject_list);
 953                 if (rc)
 954                         goto out_free;
 955
 956                 /* Register the attributes */
 957                 rc = ibft_register_attributes(&ibft_kobject_list,
 958                                               &ibft_attr_list);
 959                 if (rc)
 960                         goto out_free;
 961         } else
 962                 printk(KERN_INFO "No iBFT detected.\n");
 963
 964         return 0;
 965
 966 out_free:
 967         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
 968 out_firmware_unregister:
 969         kset_unregister(ibft_kset);
 970         return rc;
 971 }
 972
 973 static void __exit ibft_exit(void)
 974 {
 975         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
 976         kset_unregister(ibft_kset);
 977 }
 978
 979 module_init(ibft_init);
 980 module_exit(ibft_exit);