mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
491 lines
11 KiB
491 lines
11 KiB
// 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 <[email protected]> |
|
* |
|
****************************************************************************/ |
|
|
|
#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);
|
|
|