| /******************************************************************************* |
| * 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> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| ****************************************************************************/ |
| |
| #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/scsi.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/libfc.h> |
| |
| #include <target/target_core_base.h> |
| #include <target/target_core_fabric.h> |
| #include <target/target_core_fabric_configfs.h> |
| #include <target/target_core_configfs.h> |
| #include <target/configfs_macros.h> |
| |
| #include "tcm_fc.h" |
| |
| static const struct target_core_fabric_ops ft_fabric_ops; |
| |
| 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_show_port_name( |
| struct se_node_acl *se_nacl, |
| char *page) |
| { |
| 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_store_port_name( |
| struct se_node_acl *se_nacl, |
| const char *page, |
| size_t count) |
| { |
| 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); |
| } |
| |
| TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR); |
| |
| static ssize_t ft_nacl_show_node_name( |
| struct se_node_acl *se_nacl, |
| char *page) |
| { |
| 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_store_node_name( |
| struct se_node_acl *se_nacl, |
| const char *page, |
| size_t count) |
| { |
| 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); |
| } |
| |
| TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR); |
| |
| static struct configfs_attribute *ft_nacl_base_attrs[] = { |
| &ft_nacl_port_name.attr, |
| &ft_nacl_node_name.attr, |
| NULL, |
| }; |
| |
| /* |
| * ACL ops. |
| */ |
| |
| /* |
| * Add ACL for an initiator. The ACL is named arbitrarily. |
| * The port_name and/or node_name are attributes. |
| */ |
| static struct se_node_acl *ft_add_acl( |
| struct se_portal_group *se_tpg, |
| struct config_group *group, |
| const char *name) |
| { |
| struct ft_node_acl *acl; |
| struct ft_tpg *tpg; |
| u64 wwpn; |
| u32 q_depth; |
| |
| pr_debug("add acl %s\n", name); |
| tpg = container_of(se_tpg, struct ft_tpg, se_tpg); |
| |
| if (ft_parse_wwn(name, &wwpn, 1) < 0) |
| return ERR_PTR(-EINVAL); |
| |
| acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL); |
| if (!acl) |
| return ERR_PTR(-ENOMEM); |
| acl->node_auth.port_name = wwpn; |
| |
| q_depth = 32; /* XXX bogus default - get from tpg? */ |
| return core_tpg_add_initiator_node_acl(&tpg->se_tpg, |
| &acl->se_node_acl, name, q_depth); |
| } |
| |
| static void ft_del_acl(struct se_node_acl *se_acl) |
| { |
| struct se_portal_group *se_tpg = se_acl->se_tpg; |
| struct ft_tpg *tpg; |
| struct ft_node_acl *acl = container_of(se_acl, |
| struct ft_node_acl, se_node_acl); |
| |
| pr_debug("del acl %s\n", |
| config_item_name(&se_acl->acl_group.cg_item)); |
| |
| tpg = container_of(se_tpg, struct ft_tpg, se_tpg); |
| pr_debug("del acl %p se_acl %p tpg %p se_tpg %p\n", |
| acl, se_acl, tpg, &tpg->se_tpg); |
| |
| core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1); |
| kfree(acl); |
| } |
| |
| struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata) |
| { |
| struct ft_node_acl *found = NULL; |
| struct ft_node_acl *acl; |
| struct se_portal_group *se_tpg = &tpg->se_tpg; |
| struct se_node_acl *se_acl; |
| |
| spin_lock_irq(&se_tpg->acl_node_lock); |
| list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) { |
| acl = container_of(se_acl, struct ft_node_acl, se_node_acl); |
| pr_debug("acl %p port_name %llx\n", |
| acl, (unsigned long long)acl->node_auth.port_name); |
| if (acl->node_auth.port_name == rdata->ids.port_name || |
| acl->node_auth.node_name == rdata->ids.node_name) { |
| pr_debug("acl %p port_name %llx matched\n", acl, |
| (unsigned long long)rdata->ids.port_name); |
| found = acl; |
| /* XXX need to hold onto ACL */ |
| break; |
| } |
| } |
| spin_unlock_irq(&se_tpg->acl_node_lock); |
| return found; |
| } |
| |
| static struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg) |
| { |
| struct ft_node_acl *acl; |
| |
| acl = kzalloc(sizeof(*acl), GFP_KERNEL); |
| if (!acl) { |
| pr_err("Unable to allocate struct ft_node_acl\n"); |
| return NULL; |
| } |
| pr_debug("acl %p\n", acl); |
| return &acl->se_node_acl; |
| } |
| |
| static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg, |
| struct se_node_acl *se_acl) |
| { |
| struct ft_node_acl *acl = container_of(se_acl, |
| struct ft_node_acl, se_node_acl); |
| |
| pr_debug("acl %p\n", acl); |
| kfree(acl); |
| } |
| |
| /* |
| * local_port port_group (tpg) ops. |
| */ |
| static struct se_portal_group *ft_add_tpg( |
| struct se_wwn *wwn, |
| struct config_group *group, |
| 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(&ft_fabric_ops, wwn, &tpg->se_tpg, |
| tpg, TRANSPORT_TPG_TYPE_NORMAL); |
| 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_show_attr_version( |
| struct target_fabric_configfs *tf, |
| char *page) |
| { |
| return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on " |
| ""UTS_RELEASE"\n", utsname()->sysname, utsname()->machine); |
| } |
| |
| TF_WWN_ATTR_RO(ft, version); |
| |
| static struct configfs_attribute *ft_wwn_attrs[] = { |
| &ft_wwn_version.attr, |
| NULL, |
| }; |
| |
| static char *ft_get_fabric_name(void) |
| { |
| return "fc"; |
| } |
| |
| static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg) |
| { |
| struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; |
| |
| return tpg->lport_wwn->name; |
| } |
| |
| static u16 ft_get_tag(struct se_portal_group *se_tpg) |
| { |
| struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; |
| |
| /* |
| * This tag is used when forming SCSI Name identifier in EVPD=1 0x83 |
| * to represent the SCSI Target Port. |
| */ |
| return 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) |
| { |
| struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; |
| |
| return tpg->index; |
| } |
| |
| static const struct target_core_fabric_ops ft_fabric_ops = { |
| .module = THIS_MODULE, |
| .name = "fc", |
| .get_fabric_name = ft_get_fabric_name, |
| .get_fabric_proto_ident = fc_get_fabric_proto_ident, |
| .tpg_get_wwn = ft_get_fabric_wwn, |
| .tpg_get_tag = ft_get_tag, |
| .tpg_get_pr_transport_id = fc_get_pr_transport_id, |
| .tpg_get_pr_transport_id_len = fc_get_pr_transport_id_len, |
| .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id, |
| .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_alloc_fabric_acl = ft_tpg_alloc_fabric_acl, |
| .tpg_release_fabric_acl = ft_tpg_release_fabric_acl, |
| .tpg_get_inst_index = ft_tpg_get_inst_index, |
| .check_stop_free = ft_check_stop_free, |
| .release_cmd = ft_release_cmd, |
| .shutdown_session = ft_sess_shutdown, |
| .close_session = ft_sess_close, |
| .sess_get_index = ft_sess_get_index, |
| .sess_get_initiator_sid = NULL, |
| .write_pending = ft_write_pending, |
| .write_pending_status = ft_write_pending_status, |
| .set_default_node_attributes = ft_set_default_node_attr, |
| .get_task_tag = ft_get_task_tag, |
| .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_post_link = NULL, |
| .fabric_pre_unlink = NULL, |
| .fabric_make_np = NULL, |
| .fabric_drop_np = NULL, |
| .fabric_make_nodeacl = &ft_add_acl, |
| .fabric_drop_nodeacl = &ft_del_acl, |
| |
| .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); |