linux/drivers/target/tcm_fc/tfc_conf.c
Linus Torvalds 5c755fe142 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Pull SCSI target updates from Nicholas Bellinger:
 "It's been a busy development cycle for target-core in a number of
  different areas.

  The fabric API usage for se_node_acl allocation is now within
  target-core code, dropping the external API callers for all fabric
  drivers tree-wide.

  There is a new conversion to RCU hlists for se_node_acl and
  se_portal_group LUN mappings, that turns fast-past LUN lookup into a
  completely lockless code-path.  It also removes the original
  hard-coded limitation of 256 LUNs per fabric endpoint.

  The configfs attributes for backends can now be shared between core
  and driver code, allowing existing drivers to use common code while
  still allowing flexibility for new backend provided attributes.

  The highlights include:

   - Merge sbc_verify_dif_* into common code (sagi)
   - Remove iscsi-target support for obsolete IFMarker/OFMarker
     (Christophe Vu-Brugier)
   - Add bidi support in target/user backend (ilias + vangelis + agover)
   - Move se_node_acl allocation into target-core code (hch)
   - Add crc_t10dif_update common helper (akinobu + mkp)
   - Handle target-core odd SGL mapping for data transfer memory
     (akinobu)
   - Move transport ID handling into target-core (hch)
   - Move task tag into struct se_cmd + support 64-bit tags (bart)
   - Convert se_node_acl->device_list[] to RCU hlist (nab + hch +
     paulmck)
   - Convert se_portal_group->tpg_lun_list[] to RCU hlist (nab + hch +
     paulmck)
   - Simplify target backend driver registration (hch)
   - Consolidate + simplify target backend attribute implementations
     (hch + nab)
   - Subsume se_port + t10_alua_tg_pt_gp_member into se_lun (hch)
   - Drop lun_sep_lock for se_lun->lun_se_dev RCU usage (hch + nab)
   - Drop unnecessary core_tpg_register TFO parameter (nab)
   - Use 64-bit LUNs tree-wide (hannes)
   - Drop left-over TARGET_MAX_LUNS_PER_TRANSPORT limit (hannes)"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (76 commits)
  target: Bump core version to v5.0
  target: remove target_core_configfs.h
  target: remove unused TARGET_CORE_CONFIG_ROOT define
  target: consolidate version defines
  target: implement WRITE_SAME with UNMAP bit using ->execute_unmap
  target: simplify UNMAP handling
  target: replace se_cmd->execute_rw with a protocol_data field
  target/user: Fix inconsistent kmap_atomic/kunmap_atomic
  target: Send UA when changing LUN inventory
  target: Send UA upon LUN RESET tmr completion
  target: Send UA on ALUA target port group change
  target: Convert se_lun->lun_deve_lock to normal spinlock
  target: use 'se_dev_entry' when allocating UAs
  target: Remove 'ua_nacl' pointer from se_ua structure
  target_core_alua: Correct UA handling when switching states
  xen-scsiback: Fix compile warning for 64-bit LUN
  target: Remove TARGET_MAX_LUNS_PER_TRANSPORT
  target: use 64-bit LUNs
  target: Drop duplicate + unused se_dev_check_wce
  target: Drop unnecessary core_tpg_register TFO parameter
  ...
2015-07-04 14:13:43 -07:00

522 lines
12 KiB
C

/*******************************************************************************
* 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/libfc.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_fabric_configfs.h>
#include <target/configfs_macros.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_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 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;
}
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;
mutex_lock(&se_tpg->acl_node_mutex);
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;
}
}
mutex_unlock(&se_tpg->acl_node_mutex);
return found;
}
/*
* 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(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_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 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_name(void)
{
return "fc";
}
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,
.name = "fc",
.node_acl_size = sizeof(struct ft_node_acl),
.get_fabric_name = ft_get_fabric_name,
.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,
.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_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);