linux/drivers/target/tcm_fc/tfc_conf.c
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   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
  44static LIST_HEAD(ft_wwn_list);
  45DEFINE_MUTEX(ft_lport_lock);
  46
  47unsigned int ft_debug_logging;
  48module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
  49MODULE_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 */
  57static 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;
  91fail:
  92        pr_debug("err %u len %zu pos %u byte %u\n",
  93                    err, cp - name, pos, byte);
  94        return -1;
  95}
  96
  97ssize_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
 107static 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
 117static 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
 132static 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
 141static 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
 151static 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
 161static 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
 171CONFIGFS_ATTR(ft_nacl_, node_name);
 172CONFIGFS_ATTR(ft_nacl_, port_name);
 173
 174static 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
 180static 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
 193CONFIGFS_ATTR(ft_nacl_, tag);
 194
 195static 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 */
 210static 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 */
 226static 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
 282static 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 */
 313struct 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 */
 332static 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
 364static 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
 377static 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
 383CONFIGFS_ATTR_RO(ft_wwn_, version);
 384
 385static struct configfs_attribute *ft_wwn_attrs[] = {
 386        &ft_wwn_attr_version,
 387        NULL,
 388};
 389
 390static 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
 395static char *ft_get_fabric_name(void)
 396{
 397        return "fc";
 398}
 399
 400static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
 401{
 402        return ft_tpg(se_tpg)->lport_wwn->name;
 403}
 404
 405static u16 ft_get_tag(struct se_portal_group *se_tpg)
 406{
 407        /*
 408         * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
 409         * to represent the SCSI Target Port.
 410         */
 411        return ft_tpg(se_tpg)->index;
 412}
 413
 414static int ft_check_false(struct se_portal_group *se_tpg)
 415{
 416        return 0;
 417}
 418
 419static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
 420{
 421}
 422
 423static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
 424{
 425        return ft_tpg(se_tpg)->index;
 426}
 427
 428static const struct target_core_fabric_ops ft_fabric_ops = {
 429        .module =                       THIS_MODULE,
 430        .name =                         "fc",
 431        .node_acl_size =                sizeof(struct ft_node_acl),
 432        .get_fabric_name =              ft_get_fabric_name,
 433        .tpg_get_wwn =                  ft_get_fabric_wwn,
 434        .tpg_get_tag =                  ft_get_tag,
 435        .tpg_check_demo_mode =          ft_check_false,
 436        .tpg_check_demo_mode_cache =    ft_check_false,
 437        .tpg_check_demo_mode_write_protect = ft_check_false,
 438        .tpg_check_prod_mode_write_protect = ft_check_false,
 439        .tpg_get_inst_index =           ft_tpg_get_inst_index,
 440        .check_stop_free =              ft_check_stop_free,
 441        .release_cmd =                  ft_release_cmd,
 442        .close_session =                ft_sess_close,
 443        .sess_get_index =               ft_sess_get_index,
 444        .sess_get_initiator_sid =       NULL,
 445        .write_pending =                ft_write_pending,
 446        .write_pending_status =         ft_write_pending_status,
 447        .set_default_node_attributes =  ft_set_default_node_attr,
 448        .get_cmd_state =                ft_get_cmd_state,
 449        .queue_data_in =                ft_queue_data_in,
 450        .queue_status =                 ft_queue_status,
 451        .queue_tm_rsp =                 ft_queue_tm_resp,
 452        .aborted_task =                 ft_aborted_task,
 453        /*
 454         * Setup function pointers for generic logic in
 455         * target_core_fabric_configfs.c
 456         */
 457        .fabric_make_wwn =              &ft_add_wwn,
 458        .fabric_drop_wwn =              &ft_del_wwn,
 459        .fabric_make_tpg =              &ft_add_tpg,
 460        .fabric_drop_tpg =              &ft_del_tpg,
 461        .fabric_init_nodeacl =          &ft_init_nodeacl,
 462
 463        .tfc_wwn_attrs                  = ft_wwn_attrs,
 464        .tfc_tpg_nacl_base_attrs        = ft_nacl_base_attrs,
 465};
 466
 467static struct notifier_block ft_notifier = {
 468        .notifier_call = ft_lport_notify
 469};
 470
 471static int __init ft_init(void)
 472{
 473        int ret;
 474
 475        ret = target_register_template(&ft_fabric_ops);
 476        if (ret)
 477                goto out;
 478
 479        ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov);
 480        if (ret)
 481                goto out_unregister_template;
 482
 483        blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
 484        fc_lport_iterate(ft_lport_add, NULL);
 485        return 0;
 486
 487out_unregister_template:
 488        target_unregister_template(&ft_fabric_ops);
 489out:
 490        return ret;
 491}
 492
 493static void __exit ft_exit(void)
 494{
 495        blocking_notifier_chain_unregister(&fc_lport_notifier_head,
 496                                           &ft_notifier);
 497        fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
 498        fc_lport_iterate(ft_lport_del, NULL);
 499        target_unregister_template(&ft_fabric_ops);
 500        synchronize_rcu();
 501}
 502
 503MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
 504MODULE_LICENSE("GPL");
 505module_init(ft_init);
 506module_exit(ft_exit);
 507