1 /******************************************************************************* 2 * Filename: tcm_fc.c 3 * 4 * This file contains the configfs implementation for TCM_fc fabric node. 5 * Based on tcm_loop_configfs.c 6 * 7 * Copyright (c) 2010 Cisco Systems, Inc. 8 * Copyright (c) 2009,2010 Rising Tide, Inc. 9 * Copyright (c) 2009,2010 Linux-iSCSI.org 10 * 11 * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 ****************************************************************************/ 23 24 #include <linux/module.h> 25 #include <linux/moduleparam.h> 26 #include <generated/utsrelease.h> 27 #include <linux/utsname.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <linux/kthread.h> 31 #include <linux/types.h> 32 #include <linux/string.h> 33 #include <linux/configfs.h> 34 #include <linux/kernel.h> 35 #include <linux/ctype.h> 36 #include <asm/unaligned.h> 37 #include <scsi/scsi.h> 38 #include <scsi/scsi_host.h> 39 #include <scsi/scsi_device.h> 40 #include <scsi/scsi_cmnd.h> 41 #include <scsi/libfc.h> 42 43 #include <target/target_core_base.h> 44 #include <target/target_core_fabric.h> 45 #include <target/target_core_fabric_configfs.h> 46 #include <target/target_core_configfs.h> 47 #include <target/configfs_macros.h> 48 49 #include "tcm_fc.h" 50 51 static const struct target_core_fabric_ops ft_fabric_ops; 52 53 static LIST_HEAD(ft_wwn_list); 54 DEFINE_MUTEX(ft_lport_lock); 55 56 unsigned int ft_debug_logging; 57 module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR); 58 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); 59 60 /* 61 * Parse WWN. 62 * If strict, we require lower-case hex and colon separators to be sure 63 * the name is the same as what would be generated by ft_format_wwn() 64 * so the name and wwn are mapped one-to-one. 65 */ 66 static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict) 67 { 68 const char *cp; 69 char c; 70 u32 byte = 0; 71 u32 pos = 0; 72 u32 err; 73 int val; 74 75 *wwn = 0; 76 for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) { 77 c = *cp; 78 if (c == '\n' && cp[1] == '\0') 79 continue; 80 if (strict && pos++ == 2 && byte++ < 7) { 81 pos = 0; 82 if (c == ':') 83 continue; 84 err = 1; 85 goto fail; 86 } 87 if (c == '\0') { 88 err = 2; 89 if (strict && byte != 8) 90 goto fail; 91 return cp - name; 92 } 93 err = 3; 94 val = hex_to_bin(c); 95 if (val < 0 || (strict && isupper(c))) 96 goto fail; 97 *wwn = (*wwn << 4) | val; 98 } 99 err = 4; 100 fail: 101 pr_debug("err %u len %zu pos %u byte %u\n", 102 err, cp - name, pos, byte); 103 return -1; 104 } 105 106 ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn) 107 { 108 u8 b[8]; 109 110 put_unaligned_be64(wwn, b); 111 return snprintf(buf, len, 112 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x", 113 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]); 114 } 115 116 static ssize_t ft_wwn_show(void *arg, char *buf) 117 { 118 u64 *wwn = arg; 119 ssize_t len; 120 121 len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn); 122 buf[len++] = '\n'; 123 return len; 124 } 125 126 static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len) 127 { 128 ssize_t ret; 129 u64 wwn; 130 131 ret = ft_parse_wwn(buf, &wwn, 0); 132 if (ret > 0) 133 *(u64 *)arg = wwn; 134 return ret; 135 } 136 137 /* 138 * ACL auth ops. 139 */ 140 141 static ssize_t ft_nacl_show_port_name( 142 struct se_node_acl *se_nacl, 143 char *page) 144 { 145 struct ft_node_acl *acl = container_of(se_nacl, 146 struct ft_node_acl, se_node_acl); 147 148 return ft_wwn_show(&acl->node_auth.port_name, page); 149 } 150 151 static ssize_t ft_nacl_store_port_name( 152 struct se_node_acl *se_nacl, 153 const char *page, 154 size_t count) 155 { 156 struct ft_node_acl *acl = container_of(se_nacl, 157 struct ft_node_acl, se_node_acl); 158 159 return ft_wwn_store(&acl->node_auth.port_name, page, count); 160 } 161 162 TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR); 163 164 static ssize_t ft_nacl_show_node_name( 165 struct se_node_acl *se_nacl, 166 char *page) 167 { 168 struct ft_node_acl *acl = container_of(se_nacl, 169 struct ft_node_acl, se_node_acl); 170 171 return ft_wwn_show(&acl->node_auth.node_name, page); 172 } 173 174 static ssize_t ft_nacl_store_node_name( 175 struct se_node_acl *se_nacl, 176 const char *page, 177 size_t count) 178 { 179 struct ft_node_acl *acl = container_of(se_nacl, 180 struct ft_node_acl, se_node_acl); 181 182 return ft_wwn_store(&acl->node_auth.node_name, page, count); 183 } 184 185 TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR); 186 187 static struct configfs_attribute *ft_nacl_base_attrs[] = { 188 &ft_nacl_port_name.attr, 189 &ft_nacl_node_name.attr, 190 NULL, 191 }; 192 193 /* 194 * ACL ops. 195 */ 196 197 /* 198 * Add ACL for an initiator. The ACL is named arbitrarily. 199 * The port_name and/or node_name are attributes. 200 */ 201 static struct se_node_acl *ft_add_acl( 202 struct se_portal_group *se_tpg, 203 struct config_group *group, 204 const char *name) 205 { 206 struct ft_node_acl *acl; 207 struct ft_tpg *tpg; 208 u64 wwpn; 209 u32 q_depth; 210 211 pr_debug("add acl %s\n", name); 212 tpg = container_of(se_tpg, struct ft_tpg, se_tpg); 213 214 if (ft_parse_wwn(name, &wwpn, 1) < 0) 215 return ERR_PTR(-EINVAL); 216 217 acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL); 218 if (!acl) 219 return ERR_PTR(-ENOMEM); 220 acl->node_auth.port_name = wwpn; 221 222 q_depth = 32; /* XXX bogus default - get from tpg? */ 223 return core_tpg_add_initiator_node_acl(&tpg->se_tpg, 224 &acl->se_node_acl, name, q_depth); 225 } 226 227 static void ft_del_acl(struct se_node_acl *se_acl) 228 { 229 struct se_portal_group *se_tpg = se_acl->se_tpg; 230 struct ft_tpg *tpg; 231 struct ft_node_acl *acl = container_of(se_acl, 232 struct ft_node_acl, se_node_acl); 233 234 pr_debug("del acl %s\n", 235 config_item_name(&se_acl->acl_group.cg_item)); 236 237 tpg = container_of(se_tpg, struct ft_tpg, se_tpg); 238 pr_debug("del acl %p se_acl %p tpg %p se_tpg %p\n", 239 acl, se_acl, tpg, &tpg->se_tpg); 240 241 core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1); 242 kfree(acl); 243 } 244 245 struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata) 246 { 247 struct ft_node_acl *found = NULL; 248 struct ft_node_acl *acl; 249 struct se_portal_group *se_tpg = &tpg->se_tpg; 250 struct se_node_acl *se_acl; 251 252 spin_lock_irq(&se_tpg->acl_node_lock); 253 list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) { 254 acl = container_of(se_acl, struct ft_node_acl, se_node_acl); 255 pr_debug("acl %p port_name %llx\n", 256 acl, (unsigned long long)acl->node_auth.port_name); 257 if (acl->node_auth.port_name == rdata->ids.port_name || 258 acl->node_auth.node_name == rdata->ids.node_name) { 259 pr_debug("acl %p port_name %llx matched\n", acl, 260 (unsigned long long)rdata->ids.port_name); 261 found = acl; 262 /* XXX need to hold onto ACL */ 263 break; 264 } 265 } 266 spin_unlock_irq(&se_tpg->acl_node_lock); 267 return found; 268 } 269 270 static struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg) 271 { 272 struct ft_node_acl *acl; 273 274 acl = kzalloc(sizeof(*acl), GFP_KERNEL); 275 if (!acl) { 276 pr_err("Unable to allocate struct ft_node_acl\n"); 277 return NULL; 278 } 279 pr_debug("acl %p\n", acl); 280 return &acl->se_node_acl; 281 } 282 283 static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg, 284 struct se_node_acl *se_acl) 285 { 286 struct ft_node_acl *acl = container_of(se_acl, 287 struct ft_node_acl, se_node_acl); 288 289 pr_debug("acl %p\n", acl); 290 kfree(acl); 291 } 292 293 /* 294 * local_port port_group (tpg) ops. 295 */ 296 static struct se_portal_group *ft_add_tpg( 297 struct se_wwn *wwn, 298 struct config_group *group, 299 const char *name) 300 { 301 struct ft_lport_wwn *ft_wwn; 302 struct ft_tpg *tpg; 303 struct workqueue_struct *wq; 304 unsigned long index; 305 int ret; 306 307 pr_debug("tcm_fc: add tpg %s\n", name); 308 309 /* 310 * Name must be "tpgt_" followed by the index. 311 */ 312 if (strstr(name, "tpgt_") != name) 313 return NULL; 314 315 ret = kstrtoul(name + 5, 10, &index); 316 if (ret) 317 return NULL; 318 if (index > UINT_MAX) 319 return NULL; 320 321 if ((index != 1)) { 322 pr_err("Error, a single TPG=1 is used for HW port mappings\n"); 323 return ERR_PTR(-ENOSYS); 324 } 325 326 ft_wwn = container_of(wwn, struct ft_lport_wwn, se_wwn); 327 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); 328 if (!tpg) 329 return NULL; 330 tpg->index = index; 331 tpg->lport_wwn = ft_wwn; 332 INIT_LIST_HEAD(&tpg->lun_list); 333 334 wq = alloc_workqueue("tcm_fc", 0, 1); 335 if (!wq) { 336 kfree(tpg); 337 return NULL; 338 } 339 340 ret = core_tpg_register(&ft_fabric_ops, wwn, &tpg->se_tpg, 341 tpg, TRANSPORT_TPG_TYPE_NORMAL); 342 if (ret < 0) { 343 destroy_workqueue(wq); 344 kfree(tpg); 345 return NULL; 346 } 347 tpg->workqueue = wq; 348 349 mutex_lock(&ft_lport_lock); 350 ft_wwn->tpg = tpg; 351 mutex_unlock(&ft_lport_lock); 352 353 return &tpg->se_tpg; 354 } 355 356 static void ft_del_tpg(struct se_portal_group *se_tpg) 357 { 358 struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg); 359 struct ft_lport_wwn *ft_wwn = tpg->lport_wwn; 360 361 pr_debug("del tpg %s\n", 362 config_item_name(&tpg->se_tpg.tpg_group.cg_item)); 363 364 destroy_workqueue(tpg->workqueue); 365 366 /* Wait for sessions to be freed thru RCU, for BUG_ON below */ 367 synchronize_rcu(); 368 369 mutex_lock(&ft_lport_lock); 370 ft_wwn->tpg = NULL; 371 if (tpg->tport) { 372 tpg->tport->tpg = NULL; 373 tpg->tport = NULL; 374 } 375 mutex_unlock(&ft_lport_lock); 376 377 core_tpg_deregister(se_tpg); 378 kfree(tpg); 379 } 380 381 /* 382 * Verify that an lport is configured to use the tcm_fc module, and return 383 * the target port group that should be used. 384 * 385 * The caller holds ft_lport_lock. 386 */ 387 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport) 388 { 389 struct ft_lport_wwn *ft_wwn; 390 391 list_for_each_entry(ft_wwn, &ft_wwn_list, ft_wwn_node) { 392 if (ft_wwn->wwpn == lport->wwpn) 393 return ft_wwn->tpg; 394 } 395 return NULL; 396 } 397 398 /* 399 * target config instance ops. 400 */ 401 402 /* 403 * Add lport to allowed config. 404 * The name is the WWPN in lower-case ASCII, colon-separated bytes. 405 */ 406 static struct se_wwn *ft_add_wwn( 407 struct target_fabric_configfs *tf, 408 struct config_group *group, 409 const char *name) 410 { 411 struct ft_lport_wwn *ft_wwn; 412 struct ft_lport_wwn *old_ft_wwn; 413 u64 wwpn; 414 415 pr_debug("add wwn %s\n", name); 416 if (ft_parse_wwn(name, &wwpn, 1) < 0) 417 return NULL; 418 ft_wwn = kzalloc(sizeof(*ft_wwn), GFP_KERNEL); 419 if (!ft_wwn) 420 return NULL; 421 ft_wwn->wwpn = wwpn; 422 423 mutex_lock(&ft_lport_lock); 424 list_for_each_entry(old_ft_wwn, &ft_wwn_list, ft_wwn_node) { 425 if (old_ft_wwn->wwpn == wwpn) { 426 mutex_unlock(&ft_lport_lock); 427 kfree(ft_wwn); 428 return NULL; 429 } 430 } 431 list_add_tail(&ft_wwn->ft_wwn_node, &ft_wwn_list); 432 ft_format_wwn(ft_wwn->name, sizeof(ft_wwn->name), wwpn); 433 mutex_unlock(&ft_lport_lock); 434 435 return &ft_wwn->se_wwn; 436 } 437 438 static void ft_del_wwn(struct se_wwn *wwn) 439 { 440 struct ft_lport_wwn *ft_wwn = container_of(wwn, 441 struct ft_lport_wwn, se_wwn); 442 443 pr_debug("del wwn %s\n", ft_wwn->name); 444 mutex_lock(&ft_lport_lock); 445 list_del(&ft_wwn->ft_wwn_node); 446 mutex_unlock(&ft_lport_lock); 447 448 kfree(ft_wwn); 449 } 450 451 static ssize_t ft_wwn_show_attr_version( 452 struct target_fabric_configfs *tf, 453 char *page) 454 { 455 return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on " 456 ""UTS_RELEASE"\n", utsname()->sysname, utsname()->machine); 457 } 458 459 TF_WWN_ATTR_RO(ft, version); 460 461 static struct configfs_attribute *ft_wwn_attrs[] = { 462 &ft_wwn_version.attr, 463 NULL, 464 }; 465 466 static char *ft_get_fabric_name(void) 467 { 468 return "fc"; 469 } 470 471 static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg) 472 { 473 struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; 474 475 return tpg->lport_wwn->name; 476 } 477 478 static u16 ft_get_tag(struct se_portal_group *se_tpg) 479 { 480 struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; 481 482 /* 483 * This tag is used when forming SCSI Name identifier in EVPD=1 0x83 484 * to represent the SCSI Target Port. 485 */ 486 return tpg->index; 487 } 488 489 static u32 ft_get_default_depth(struct se_portal_group *se_tpg) 490 { 491 return 1; 492 } 493 494 static int ft_check_false(struct se_portal_group *se_tpg) 495 { 496 return 0; 497 } 498 499 static void ft_set_default_node_attr(struct se_node_acl *se_nacl) 500 { 501 } 502 503 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg) 504 { 505 struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; 506 507 return tpg->index; 508 } 509 510 static const struct target_core_fabric_ops ft_fabric_ops = { 511 .module = THIS_MODULE, 512 .name = "fc", 513 .get_fabric_name = ft_get_fabric_name, 514 .get_fabric_proto_ident = fc_get_fabric_proto_ident, 515 .tpg_get_wwn = ft_get_fabric_wwn, 516 .tpg_get_tag = ft_get_tag, 517 .tpg_get_default_depth = ft_get_default_depth, 518 .tpg_get_pr_transport_id = fc_get_pr_transport_id, 519 .tpg_get_pr_transport_id_len = fc_get_pr_transport_id_len, 520 .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id, 521 .tpg_check_demo_mode = ft_check_false, 522 .tpg_check_demo_mode_cache = ft_check_false, 523 .tpg_check_demo_mode_write_protect = ft_check_false, 524 .tpg_check_prod_mode_write_protect = ft_check_false, 525 .tpg_alloc_fabric_acl = ft_tpg_alloc_fabric_acl, 526 .tpg_release_fabric_acl = ft_tpg_release_fabric_acl, 527 .tpg_get_inst_index = ft_tpg_get_inst_index, 528 .check_stop_free = ft_check_stop_free, 529 .release_cmd = ft_release_cmd, 530 .shutdown_session = ft_sess_shutdown, 531 .close_session = ft_sess_close, 532 .sess_get_index = ft_sess_get_index, 533 .sess_get_initiator_sid = NULL, 534 .write_pending = ft_write_pending, 535 .write_pending_status = ft_write_pending_status, 536 .set_default_node_attributes = ft_set_default_node_attr, 537 .get_task_tag = ft_get_task_tag, 538 .get_cmd_state = ft_get_cmd_state, 539 .queue_data_in = ft_queue_data_in, 540 .queue_status = ft_queue_status, 541 .queue_tm_rsp = ft_queue_tm_resp, 542 .aborted_task = ft_aborted_task, 543 /* 544 * Setup function pointers for generic logic in 545 * target_core_fabric_configfs.c 546 */ 547 .fabric_make_wwn = &ft_add_wwn, 548 .fabric_drop_wwn = &ft_del_wwn, 549 .fabric_make_tpg = &ft_add_tpg, 550 .fabric_drop_tpg = &ft_del_tpg, 551 .fabric_post_link = NULL, 552 .fabric_pre_unlink = NULL, 553 .fabric_make_np = NULL, 554 .fabric_drop_np = NULL, 555 .fabric_make_nodeacl = &ft_add_acl, 556 .fabric_drop_nodeacl = &ft_del_acl, 557 558 .tfc_wwn_attrs = ft_wwn_attrs, 559 .tfc_tpg_nacl_base_attrs = ft_nacl_base_attrs, 560 }; 561 562 static struct notifier_block ft_notifier = { 563 .notifier_call = ft_lport_notify 564 }; 565 566 static int __init ft_init(void) 567 { 568 int ret; 569 570 ret = target_register_template(&ft_fabric_ops); 571 if (ret) 572 goto out; 573 574 ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov); 575 if (ret) 576 goto out_unregister_template; 577 578 blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier); 579 fc_lport_iterate(ft_lport_add, NULL); 580 return 0; 581 582 out_unregister_template: 583 target_unregister_template(&ft_fabric_ops); 584 out: 585 return ret; 586 } 587 588 static void __exit ft_exit(void) 589 { 590 blocking_notifier_chain_unregister(&fc_lport_notifier_head, 591 &ft_notifier); 592 fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov); 593 fc_lport_iterate(ft_lport_del, NULL); 594 target_unregister_template(&ft_fabric_ops); 595 synchronize_rcu(); 596 } 597 598 MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION); 599 MODULE_LICENSE("GPL"); 600 module_init(ft_init); 601 module_exit(ft_exit); 602