diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/target/tcm_fc/tfc_conf.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/drivers/target/tcm_fc/tfc_conf.c b/drivers/target/tcm_fc/tfc_conf.c new file mode 100644 index 000000000..1a38c98f6 --- /dev/null +++ b/drivers/target/tcm_fc/tfc_conf.c @@ -0,0 +1,491 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/******************************************************************************* + * Filename: tcm_fc.c + * + * This file contains the configfs implementation for TCM_fc fabric node. + * Based on tcm_loop_configfs.c + * + * Copyright (c) 2010 Cisco Systems, Inc. + * Copyright (c) 2009,2010 Rising Tide, Inc. + * Copyright (c) 2009,2010 Linux-iSCSI.org + * + * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org> + * + ****************************************************************************/ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <generated/utsrelease.h> +#include <linux/utsname.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/kthread.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/configfs.h> +#include <linux/kernel.h> +#include <linux/ctype.h> +#include <asm/unaligned.h> +#include <scsi/libfc.h> + +#include <target/target_core_base.h> +#include <target/target_core_fabric.h> + +#include "tcm_fc.h" + +static LIST_HEAD(ft_wwn_list); +DEFINE_MUTEX(ft_lport_lock); + +unsigned int ft_debug_logging; +module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); + +/* + * Parse WWN. + * If strict, we require lower-case hex and colon separators to be sure + * the name is the same as what would be generated by ft_format_wwn() + * so the name and wwn are mapped one-to-one. + */ +static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict) +{ + const char *cp; + char c; + u32 byte = 0; + u32 pos = 0; + u32 err; + int val; + + *wwn = 0; + for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) { + c = *cp; + if (c == '\n' && cp[1] == '\0') + continue; + if (strict && pos++ == 2 && byte++ < 7) { + pos = 0; + if (c == ':') + continue; + err = 1; + goto fail; + } + if (c == '\0') { + err = 2; + if (strict && byte != 8) + goto fail; + return cp - name; + } + err = 3; + val = hex_to_bin(c); + if (val < 0 || (strict && isupper(c))) + goto fail; + *wwn = (*wwn << 4) | val; + } + err = 4; +fail: + pr_debug("err %u len %zu pos %u byte %u\n", + err, cp - name, pos, byte); + return -1; +} + +ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn) +{ + u8 b[8]; + + put_unaligned_be64(wwn, b); + return snprintf(buf, len, + "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x", + b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]); +} + +static ssize_t ft_wwn_show(void *arg, char *buf) +{ + u64 *wwn = arg; + ssize_t len; + + len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn); + buf[len++] = '\n'; + return len; +} + +static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len) +{ + ssize_t ret; + u64 wwn; + + ret = ft_parse_wwn(buf, &wwn, 0); + if (ret > 0) + *(u64 *)arg = wwn; + return ret; +} + +/* + * ACL auth ops. + */ + +static ssize_t ft_nacl_port_name_show(struct config_item *item, char *page) +{ + struct se_node_acl *se_nacl = acl_to_nacl(item); + struct ft_node_acl *acl = container_of(se_nacl, + struct ft_node_acl, se_node_acl); + + return ft_wwn_show(&acl->node_auth.port_name, page); +} + +static ssize_t ft_nacl_port_name_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_node_acl *se_nacl = acl_to_nacl(item); + struct ft_node_acl *acl = container_of(se_nacl, + struct ft_node_acl, se_node_acl); + + return ft_wwn_store(&acl->node_auth.port_name, page, count); +} + +static ssize_t ft_nacl_node_name_show(struct config_item *item, + char *page) +{ + struct se_node_acl *se_nacl = acl_to_nacl(item); + struct ft_node_acl *acl = container_of(se_nacl, + struct ft_node_acl, se_node_acl); + + return ft_wwn_show(&acl->node_auth.node_name, page); +} + +static ssize_t ft_nacl_node_name_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_node_acl *se_nacl = acl_to_nacl(item); + struct ft_node_acl *acl = container_of(se_nacl, + struct ft_node_acl, se_node_acl); + + return ft_wwn_store(&acl->node_auth.node_name, page, count); +} + +CONFIGFS_ATTR(ft_nacl_, node_name); +CONFIGFS_ATTR(ft_nacl_, port_name); + +static ssize_t ft_nacl_tag_show(struct config_item *item, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%s", acl_to_nacl(item)->acl_tag); +} + +static ssize_t ft_nacl_tag_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_node_acl *se_nacl = acl_to_nacl(item); + int ret; + + ret = core_tpg_set_initiator_node_tag(se_nacl->se_tpg, se_nacl, page); + + if (ret < 0) + return ret; + return count; +} + +CONFIGFS_ATTR(ft_nacl_, tag); + +static struct configfs_attribute *ft_nacl_base_attrs[] = { + &ft_nacl_attr_port_name, + &ft_nacl_attr_node_name, + &ft_nacl_attr_tag, + NULL, +}; + +/* + * ACL ops. + */ + +/* + * Add ACL for an initiator. The ACL is named arbitrarily. + * The port_name and/or node_name are attributes. + */ +static int ft_init_nodeacl(struct se_node_acl *nacl, const char *name) +{ + struct ft_node_acl *acl = + container_of(nacl, struct ft_node_acl, se_node_acl); + u64 wwpn; + + if (ft_parse_wwn(name, &wwpn, 1) < 0) + return -EINVAL; + + acl->node_auth.port_name = wwpn; + return 0; +} + +/* + * local_port port_group (tpg) ops. + */ +static struct se_portal_group *ft_add_tpg(struct se_wwn *wwn, const char *name) +{ + struct ft_lport_wwn *ft_wwn; + struct ft_tpg *tpg; + struct workqueue_struct *wq; + unsigned long index; + int ret; + + pr_debug("tcm_fc: add tpg %s\n", name); + + /* + * Name must be "tpgt_" followed by the index. + */ + if (strstr(name, "tpgt_") != name) + return NULL; + + ret = kstrtoul(name + 5, 10, &index); + if (ret) + return NULL; + if (index > UINT_MAX) + return NULL; + + if ((index != 1)) { + pr_err("Error, a single TPG=1 is used for HW port mappings\n"); + return ERR_PTR(-ENOSYS); + } + + ft_wwn = container_of(wwn, struct ft_lport_wwn, se_wwn); + tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); + if (!tpg) + return NULL; + tpg->index = index; + tpg->lport_wwn = ft_wwn; + INIT_LIST_HEAD(&tpg->lun_list); + + wq = alloc_workqueue("tcm_fc", 0, 1); + if (!wq) { + kfree(tpg); + return NULL; + } + + ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP); + if (ret < 0) { + destroy_workqueue(wq); + kfree(tpg); + return NULL; + } + tpg->workqueue = wq; + + mutex_lock(&ft_lport_lock); + ft_wwn->tpg = tpg; + mutex_unlock(&ft_lport_lock); + + return &tpg->se_tpg; +} + +static void ft_del_tpg(struct se_portal_group *se_tpg) +{ + struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg); + struct ft_lport_wwn *ft_wwn = tpg->lport_wwn; + + pr_debug("del tpg %s\n", + config_item_name(&tpg->se_tpg.tpg_group.cg_item)); + + destroy_workqueue(tpg->workqueue); + + /* Wait for sessions to be freed thru RCU, for BUG_ON below */ + synchronize_rcu(); + + mutex_lock(&ft_lport_lock); + ft_wwn->tpg = NULL; + if (tpg->tport) { + tpg->tport->tpg = NULL; + tpg->tport = NULL; + } + mutex_unlock(&ft_lport_lock); + + core_tpg_deregister(se_tpg); + kfree(tpg); +} + +/* + * Verify that an lport is configured to use the tcm_fc module, and return + * the target port group that should be used. + * + * The caller holds ft_lport_lock. + */ +struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport) +{ + struct ft_lport_wwn *ft_wwn; + + list_for_each_entry(ft_wwn, &ft_wwn_list, ft_wwn_node) { + if (ft_wwn->wwpn == lport->wwpn) + return ft_wwn->tpg; + } + return NULL; +} + +/* + * target config instance ops. + */ + +/* + * Add lport to allowed config. + * The name is the WWPN in lower-case ASCII, colon-separated bytes. + */ +static struct se_wwn *ft_add_wwn( + struct target_fabric_configfs *tf, + struct config_group *group, + const char *name) +{ + struct ft_lport_wwn *ft_wwn; + struct ft_lport_wwn *old_ft_wwn; + u64 wwpn; + + pr_debug("add wwn %s\n", name); + if (ft_parse_wwn(name, &wwpn, 1) < 0) + return NULL; + ft_wwn = kzalloc(sizeof(*ft_wwn), GFP_KERNEL); + if (!ft_wwn) + return NULL; + ft_wwn->wwpn = wwpn; + + mutex_lock(&ft_lport_lock); + list_for_each_entry(old_ft_wwn, &ft_wwn_list, ft_wwn_node) { + if (old_ft_wwn->wwpn == wwpn) { + mutex_unlock(&ft_lport_lock); + kfree(ft_wwn); + return NULL; + } + } + list_add_tail(&ft_wwn->ft_wwn_node, &ft_wwn_list); + ft_format_wwn(ft_wwn->name, sizeof(ft_wwn->name), wwpn); + mutex_unlock(&ft_lport_lock); + + return &ft_wwn->se_wwn; +} + +static void ft_del_wwn(struct se_wwn *wwn) +{ + struct ft_lport_wwn *ft_wwn = container_of(wwn, + struct ft_lport_wwn, se_wwn); + + pr_debug("del wwn %s\n", ft_wwn->name); + mutex_lock(&ft_lport_lock); + list_del(&ft_wwn->ft_wwn_node); + mutex_unlock(&ft_lport_lock); + + kfree(ft_wwn); +} + +static ssize_t ft_wwn_version_show(struct config_item *item, char *page) +{ + return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on " + ""UTS_RELEASE"\n", utsname()->sysname, utsname()->machine); +} + +CONFIGFS_ATTR_RO(ft_wwn_, version); + +static struct configfs_attribute *ft_wwn_attrs[] = { + &ft_wwn_attr_version, + NULL, +}; + +static inline struct ft_tpg *ft_tpg(struct se_portal_group *se_tpg) +{ + return container_of(se_tpg, struct ft_tpg, se_tpg); +} + +static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg) +{ + return ft_tpg(se_tpg)->lport_wwn->name; +} + +static u16 ft_get_tag(struct se_portal_group *se_tpg) +{ + /* + * This tag is used when forming SCSI Name identifier in EVPD=1 0x83 + * to represent the SCSI Target Port. + */ + return ft_tpg(se_tpg)->index; +} + +static int ft_check_false(struct se_portal_group *se_tpg) +{ + return 0; +} + +static void ft_set_default_node_attr(struct se_node_acl *se_nacl) +{ +} + +static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg) +{ + return ft_tpg(se_tpg)->index; +} + +static const struct target_core_fabric_ops ft_fabric_ops = { + .module = THIS_MODULE, + .fabric_name = "fc", + .node_acl_size = sizeof(struct ft_node_acl), + .tpg_get_wwn = ft_get_fabric_wwn, + .tpg_get_tag = ft_get_tag, + .tpg_check_demo_mode = ft_check_false, + .tpg_check_demo_mode_cache = ft_check_false, + .tpg_check_demo_mode_write_protect = ft_check_false, + .tpg_check_prod_mode_write_protect = ft_check_false, + .tpg_get_inst_index = ft_tpg_get_inst_index, + .check_stop_free = ft_check_stop_free, + .release_cmd = ft_release_cmd, + .close_session = ft_sess_close, + .sess_get_index = ft_sess_get_index, + .sess_get_initiator_sid = NULL, + .write_pending = ft_write_pending, + .set_default_node_attributes = ft_set_default_node_attr, + .get_cmd_state = ft_get_cmd_state, + .queue_data_in = ft_queue_data_in, + .queue_status = ft_queue_status, + .queue_tm_rsp = ft_queue_tm_resp, + .aborted_task = ft_aborted_task, + /* + * Setup function pointers for generic logic in + * target_core_fabric_configfs.c + */ + .fabric_make_wwn = &ft_add_wwn, + .fabric_drop_wwn = &ft_del_wwn, + .fabric_make_tpg = &ft_add_tpg, + .fabric_drop_tpg = &ft_del_tpg, + .fabric_init_nodeacl = &ft_init_nodeacl, + + .tfc_wwn_attrs = ft_wwn_attrs, + .tfc_tpg_nacl_base_attrs = ft_nacl_base_attrs, +}; + +static struct notifier_block ft_notifier = { + .notifier_call = ft_lport_notify +}; + +static int __init ft_init(void) +{ + int ret; + + ret = target_register_template(&ft_fabric_ops); + if (ret) + goto out; + + ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov); + if (ret) + goto out_unregister_template; + + blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier); + fc_lport_iterate(ft_lport_add, NULL); + return 0; + +out_unregister_template: + target_unregister_template(&ft_fabric_ops); +out: + return ret; +} + +static void __exit ft_exit(void) +{ + blocking_notifier_chain_unregister(&fc_lport_notifier_head, + &ft_notifier); + fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov); + fc_lport_iterate(ft_lport_del, NULL); + target_unregister_template(&ft_fabric_ops); + synchronize_rcu(); +} + +MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION); +MODULE_LICENSE("GPL"); +module_init(ft_init); +module_exit(ft_exit); |