drivers/target/tcm_fc/tfc_conf.c

   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);