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/libfc.h> 38 39 #include <target/target_core_base.h> 40 #include <target/target_core_fabric.h> 41 42 #include "tcm_fc.h" 43 44 static LIST_HEAD(ft_wwn_list); 45 DEFINE_MUTEX(ft_lport_lock); 46 47 unsigned int ft_debug_logging; 48 module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR); 49 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); 50 51 /* 52 * Parse WWN. 53 * If strict, we require lower-case hex and colon separators to be sure 54 * the name is the same as what would be generated by ft_format_wwn() 55 * so the name and wwn are mapped one-to-one. 56 */ 57 static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict) 58 { 59 const char *cp; 60 char c; 61 u32 byte = 0; 62 u32 pos = 0; 63 u32 err; 64 int val; 65 66 *wwn = 0; 67 for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) { 68 c = *cp; 69 if (c == '\n' && cp[1] == '\0') 70 continue; 71 if (strict && pos++ == 2 && byte++ < 7) { 72 pos = 0; 73 if (c == ':') 74 continue; 75 err = 1; 76 goto fail; 77 } 78 if (c == '\0') { 79 err = 2; 80 if (strict && byte != 8) 81 goto fail; 82 return cp - name; 83 } 84 err = 3; 85 val = hex_to_bin(c); 86 if (val < 0 || (strict && isupper(c))) 87 goto fail; 88 *wwn = (*wwn << 4) | val; 89 } 90 err = 4; 91 fail: 92 pr_debug("err %u len %zu pos %u byte %u\n", 93 err, cp - name, pos, byte); 94 return -1; 95 } 96 97 ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn) 98 { 99 u8 b[8]; 100 101 put_unaligned_be64(wwn, b); 102 return snprintf(buf, len, 103 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x", 104 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]); 105 } 106 107 static ssize_t ft_wwn_show(void *arg, char *buf) 108 { 109 u64 *wwn = arg; 110 ssize_t len; 111 112 len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn); 113 buf[len++] = '\n'; 114 return len; 115 } 116 117 static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len) 118 { 119 ssize_t ret; 120 u64 wwn; 121 122 ret = ft_parse_wwn(buf, &wwn, 0); 123 if (ret > 0) 124 *(u64 *)arg = wwn; 125 return ret; 126 } 127 128 /* 129 * ACL auth ops. 130 */ 131 132 static ssize_t ft_nacl_port_name_show(struct config_item *item, char *page) 133 { 134 struct se_node_acl *se_nacl = acl_to_nacl(item); 135 struct ft_node_acl *acl = container_of(se_nacl, 136 struct ft_node_acl, se_node_acl); 137 138 return ft_wwn_show(&acl->node_auth.port_name, page); 139 } 140 141 static ssize_t ft_nacl_port_name_store(struct config_item *item, 142 const char *page, size_t count) 143 { 144 struct se_node_acl *se_nacl = acl_to_nacl(item); 145 struct ft_node_acl *acl = container_of(se_nacl, 146 struct ft_node_acl, se_node_acl); 147 148 return ft_wwn_store(&acl->node_auth.port_name, page, count); 149 } 150 151 static ssize_t ft_nacl_node_name_show(struct config_item *item, 152 char *page) 153 { 154 struct se_node_acl *se_nacl = acl_to_nacl(item); 155 struct ft_node_acl *acl = container_of(se_nacl, 156 struct ft_node_acl, se_node_acl); 157 158 return ft_wwn_show(&acl->node_auth.node_name, page); 159 } 160 161 static ssize_t ft_nacl_node_name_store(struct config_item *item, 162 const char *page, size_t count) 163 { 164 struct se_node_acl *se_nacl = acl_to_nacl(item); 165 struct ft_node_acl *acl = container_of(se_nacl, 166 struct ft_node_acl, se_node_acl); 167 168 return ft_wwn_store(&acl->node_auth.node_name, page, count); 169 } 170 171 CONFIGFS_ATTR(ft_nacl_, node_name); 172 CONFIGFS_ATTR(ft_nacl_, port_name); 173 174 static ssize_t ft_nacl_tag_show(struct config_item *item, 175 char *page) 176 { 177 return snprintf(page, PAGE_SIZE, "%s", acl_to_nacl(item)->acl_tag); 178 } 179 180 static ssize_t ft_nacl_tag_store(struct config_item *item, 181 const char *page, size_t count) 182 { 183 struct se_node_acl *se_nacl = acl_to_nacl(item); 184 int ret; 185 186 ret = core_tpg_set_initiator_node_tag(se_nacl->se_tpg, se_nacl, page); 187 188 if (ret < 0) 189 return ret; 190 return count; 191 } 192 193 CONFIGFS_ATTR(ft_nacl_, tag); 194 195 static struct configfs_attribute *ft_nacl_base_attrs[] = { 196 &ft_nacl_attr_port_name, 197 &ft_nacl_attr_node_name, 198 &ft_nacl_attr_tag, 199 NULL, 200 }; 201 202 /* 203 * ACL ops. 204 */ 205 206 /* 207 * Add ACL for an initiator. The ACL is named arbitrarily. 208 * The port_name and/or node_name are attributes. 209 */ 210 static int ft_init_nodeacl(struct se_node_acl *nacl, const char *name) 211 { 212 struct ft_node_acl *acl = 213 container_of(nacl, struct ft_node_acl, se_node_acl); 214 u64 wwpn; 215 216 if (ft_parse_wwn(name, &wwpn, 1) < 0) 217 return -EINVAL; 218 219 acl->node_auth.port_name = wwpn; 220 return 0; 221 } 222 223 /* 224 * local_port port_group (tpg) ops. 225 */ 226 static struct se_portal_group *ft_add_tpg(struct se_wwn *wwn, const char *name) 227 { 228 struct ft_lport_wwn *ft_wwn; 229 struct ft_tpg *tpg; 230 struct workqueue_struct *wq; 231 unsigned long index; 232 int ret; 233 234 pr_debug("tcm_fc: add tpg %s\n", name); 235 236 /* 237 * Name must be "tpgt_" followed by the index. 238 */ 239 if (strstr(name, "tpgt_") != name) 240 return NULL; 241 242 ret = kstrtoul(name + 5, 10, &index); 243 if (ret) 244 return NULL; 245 if (index > UINT_MAX) 246 return NULL; 247 248 if ((index != 1)) { 249 pr_err("Error, a single TPG=1 is used for HW port mappings\n"); 250 return ERR_PTR(-ENOSYS); 251 } 252 253 ft_wwn = container_of(wwn, struct ft_lport_wwn, se_wwn); 254 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); 255 if (!tpg) 256 return NULL; 257 tpg->index = index; 258 tpg->lport_wwn = ft_wwn; 259 INIT_LIST_HEAD(&tpg->lun_list); 260 261 wq = alloc_workqueue("tcm_fc", 0, 1); 262 if (!wq) { 263 kfree(tpg); 264 return NULL; 265 } 266 267 ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP); 268 if (ret < 0) { 269 destroy_workqueue(wq); 270 kfree(tpg); 271 return NULL; 272 } 273 tpg->workqueue = wq; 274 275 mutex_lock(&ft_lport_lock); 276 ft_wwn->tpg = tpg; 277 mutex_unlock(&ft_lport_lock); 278 279 return &tpg->se_tpg; 280 } 281 282 static void ft_del_tpg(struct se_portal_group *se_tpg) 283 { 284 struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg); 285 struct ft_lport_wwn *ft_wwn = tpg->lport_wwn; 286 287 pr_debug("del tpg %s\n", 288 config_item_name(&tpg->se_tpg.tpg_group.cg_item)); 289 290 destroy_workqueue(tpg->workqueue); 291 292 /* Wait for sessions to be freed thru RCU, for BUG_ON below */ 293 synchronize_rcu(); 294 295 mutex_lock(&ft_lport_lock); 296 ft_wwn->tpg = NULL; 297 if (tpg->tport) { 298 tpg->tport->tpg = NULL; 299 tpg->tport = NULL; 300 } 301 mutex_unlock(&ft_lport_lock); 302 303 core_tpg_deregister(se_tpg); 304 kfree(tpg); 305 } 306 307 /* 308 * Verify that an lport is configured to use the tcm_fc module, and return 309 * the target port group that should be used. 310 * 311 * The caller holds ft_lport_lock. 312 */ 313 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport) 314 { 315 struct ft_lport_wwn *ft_wwn; 316 317 list_for_each_entry(ft_wwn, &ft_wwn_list, ft_wwn_node) { 318 if (ft_wwn->wwpn == lport->wwpn) 319 return ft_wwn->tpg; 320 } 321 return NULL; 322 } 323 324 /* 325 * target config instance ops. 326 */ 327 328 /* 329 * Add lport to allowed config. 330 * The name is the WWPN in lower-case ASCII, colon-separated bytes. 331 */ 332 static struct se_wwn *ft_add_wwn( 333 struct target_fabric_configfs *tf, 334 struct config_group *group, 335 const char *name) 336 { 337 struct ft_lport_wwn *ft_wwn; 338 struct ft_lport_wwn *old_ft_wwn; 339 u64 wwpn; 340 341 pr_debug("add wwn %s\n", name); 342 if (ft_parse_wwn(name, &wwpn, 1) < 0) 343 return NULL; 344 ft_wwn = kzalloc(sizeof(*ft_wwn), GFP_KERNEL); 345 if (!ft_wwn) 346 return NULL; 347 ft_wwn->wwpn = wwpn; 348 349 mutex_lock(&ft_lport_lock); 350 list_for_each_entry(old_ft_wwn, &ft_wwn_list, ft_wwn_node) { 351 if (old_ft_wwn->wwpn == wwpn) { 352 mutex_unlock(&ft_lport_lock); 353 kfree(ft_wwn); 354 return NULL; 355 } 356 } 357 list_add_tail(&ft_wwn->ft_wwn_node, &ft_wwn_list); 358 ft_format_wwn(ft_wwn->name, sizeof(ft_wwn->name), wwpn); 359 mutex_unlock(&ft_lport_lock); 360 361 return &ft_wwn->se_wwn; 362 } 363 364 static void ft_del_wwn(struct se_wwn *wwn) 365 { 366 struct ft_lport_wwn *ft_wwn = container_of(wwn, 367 struct ft_lport_wwn, se_wwn); 368 369 pr_debug("del wwn %s\n", ft_wwn->name); 370 mutex_lock(&ft_lport_lock); 371 list_del(&ft_wwn->ft_wwn_node); 372 mutex_unlock(&ft_lport_lock); 373 374 kfree(ft_wwn); 375 } 376 377 static ssize_t ft_wwn_version_show(struct config_item *item, char *page) 378 { 379 return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on " 380 ""UTS_RELEASE"\n", utsname()->sysname, utsname()->machine); 381 } 382 383 CONFIGFS_ATTR_RO(ft_wwn_, version); 384 385 static struct configfs_attribute *ft_wwn_attrs[] = { 386 &ft_wwn_attr_version, 387 NULL, 388 }; 389 390 static inline struct ft_tpg *ft_tpg(struct se_portal_group *se_tpg) 391 { 392 return container_of(se_tpg, struct ft_tpg, se_tpg); 393 } 394 395 static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg) 396 { 397 return ft_tpg(se_tpg)->lport_wwn->name; 398 } 399 400 static u16 ft_get_tag(struct se_portal_group *se_tpg) 401 { 402 /* 403 * This tag is used when forming SCSI Name identifier in EVPD=1 0x83 404 * to represent the SCSI Target Port. 405 */ 406 return ft_tpg(se_tpg)->index; 407 } 408 409 static int ft_check_false(struct se_portal_group *se_tpg) 410 { 411 return 0; 412 } 413 414 static void ft_set_default_node_attr(struct se_node_acl *se_nacl) 415 { 416 } 417 418 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg) 419 { 420 return ft_tpg(se_tpg)->index; 421 } 422 423 static const struct target_core_fabric_ops ft_fabric_ops = { 424 .module = THIS_MODULE, 425 .fabric_name = "fc", 426 .node_acl_size = sizeof(struct ft_node_acl), 427 .tpg_get_wwn = ft_get_fabric_wwn, 428 .tpg_get_tag = ft_get_tag, 429 .tpg_check_demo_mode = ft_check_false, 430 .tpg_check_demo_mode_cache = ft_check_false, 431 .tpg_check_demo_mode_write_protect = ft_check_false, 432 .tpg_check_prod_mode_write_protect = ft_check_false, 433 .tpg_get_inst_index = ft_tpg_get_inst_index, 434 .check_stop_free = ft_check_stop_free, 435 .release_cmd = ft_release_cmd, 436 .close_session = ft_sess_close, 437 .sess_get_index = ft_sess_get_index, 438 .sess_get_initiator_sid = NULL, 439 .write_pending = ft_write_pending, 440 .set_default_node_attributes = ft_set_default_node_attr, 441 .get_cmd_state = ft_get_cmd_state, 442 .queue_data_in = ft_queue_data_in, 443 .queue_status = ft_queue_status, 444 .queue_tm_rsp = ft_queue_tm_resp, 445 .aborted_task = ft_aborted_task, 446 /* 447 * Setup function pointers for generic logic in 448 * target_core_fabric_configfs.c 449 */ 450 .fabric_make_wwn = &ft_add_wwn, 451 .fabric_drop_wwn = &ft_del_wwn, 452 .fabric_make_tpg = &ft_add_tpg, 453 .fabric_drop_tpg = &ft_del_tpg, 454 .fabric_init_nodeacl = &ft_init_nodeacl, 455 456 .tfc_wwn_attrs = ft_wwn_attrs, 457 .tfc_tpg_nacl_base_attrs = ft_nacl_base_attrs, 458 }; 459 460 static struct notifier_block ft_notifier = { 461 .notifier_call = ft_lport_notify 462 }; 463 464 static int __init ft_init(void) 465 { 466 int ret; 467 468 ret = target_register_template(&ft_fabric_ops); 469 if (ret) 470 goto out; 471 472 ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov); 473 if (ret) 474 goto out_unregister_template; 475 476 blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier); 477 fc_lport_iterate(ft_lport_add, NULL); 478 return 0; 479 480 out_unregister_template: 481 target_unregister_template(&ft_fabric_ops); 482 out: 483 return ret; 484 } 485 486 static void __exit ft_exit(void) 487 { 488 blocking_notifier_chain_unregister(&fc_lport_notifier_head, 489 &ft_notifier); 490 fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov); 491 fc_lport_iterate(ft_lport_del, NULL); 492 target_unregister_template(&ft_fabric_ops); 493 synchronize_rcu(); 494 } 495 496 MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION); 497 MODULE_LICENSE("GPL"); 498 module_init(ft_init); 499 module_exit(ft_exit); 500