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scsi: target: core: Add RTPI field to target port

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SAM-5 4.6.5.2 (Relative Port Identifier attribute) defines the attribute as
unique across SCSI target ports.

The change introduces RTPI attribute to se_portal group. The value is
unique across all enabled SCSI target ports. It also limits number of SCSI
target ports to 65535.

Signed-off-by: Dmitry Bogdanov <d.bogdanov@yadro.com>
Link: https://lore.kernel.org/r/20230301084512.21956-2-d.bogdanov@yadro.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Dmitry Bogdanov 2023-03-01 11:45:09 +03:00 committed by Martin K. Petersen
parent fe15c26ee2
commit 3f4b9cb413
4 changed files with 62 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/target/target_core_fabric_configfs.c
View File

@ -836,13 +836,12 @@ static ssize_t target_fabric_tpg_base_enable_store(struct config_item *item,
if (se_tpg->enabled == op)
return count;
ret = se_tpg->se_tpg_tfo->fabric_enable_tpg(se_tpg, op);
if (op)
ret = target_tpg_enable(se_tpg);
else
ret = target_tpg_disable(se_tpg);
if (ret)
return ret;
se_tpg->enabled = op;
return count;
}

2
drivers/target/target_core_internal.h
View File

@ -132,6 +132,8 @@ void core_tpg_remove_lun(struct se_portal_group *, struct se_lun *);
struct se_node_acl *core_tpg_add_initiator_node_acl(struct se_portal_group *tpg,
const char *initiatorname);
void core_tpg_del_initiator_node_acl(struct se_node_acl *acl);
int target_tpg_enable(struct se_portal_group *se_tpg);
int target_tpg_disable(struct se_portal_group *se_tpg);
/* target_core_transport.c */
int init_se_kmem_caches(void);

54
drivers/target/target_core_tpg.c
View File

@ -31,6 +31,7 @@
#include "target_core_ua.h"
extern struct se_device *g_lun0_dev;
static DEFINE_XARRAY_ALLOC(tpg_xa);
/* __core_tpg_get_initiator_node_acl():
*
@ -439,6 +440,57 @@ static void core_tpg_lun_ref_release(struct percpu_ref *ref)
complete(&lun->lun_shutdown_comp);
}
static int target_tpg_register_rtpi(struct se_portal_group *se_tpg)
{
u32 val;
int ret;
ret = xa_alloc(&tpg_xa, &val, se_tpg,
XA_LIMIT(1, USHRT_MAX), GFP_KERNEL);
if (!ret)
se_tpg->tpg_rtpi = val;
return ret;
}
static void target_tpg_deregister_rtpi(struct se_portal_group *se_tpg)
{
if (se_tpg->tpg_rtpi && se_tpg->enabled)
xa_erase(&tpg_xa, se_tpg->tpg_rtpi);
}
int target_tpg_enable(struct se_portal_group *se_tpg)
{
int ret;
ret = target_tpg_register_rtpi(se_tpg);
if (ret)
return ret;
ret = se_tpg->se_tpg_tfo->fabric_enable_tpg(se_tpg, true);
if (ret) {
target_tpg_deregister_rtpi(se_tpg);
return ret;
}
se_tpg->enabled = true;
return 0;
}
int target_tpg_disable(struct se_portal_group *se_tpg)
{
int ret;
target_tpg_deregister_rtpi(se_tpg);
ret = se_tpg->se_tpg_tfo->fabric_enable_tpg(se_tpg, false);
if (!ret)
se_tpg->enabled = false;
return ret;
}
/* Does not change se_wwn->priv. */
int core_tpg_register(
struct se_wwn *se_wwn,
@ -535,6 +587,8 @@ int core_tpg_deregister(struct se_portal_group *se_tpg)
kfree_rcu(se_tpg->tpg_virt_lun0, rcu_head);
}
target_tpg_deregister_rtpi(se_tpg);
return 0;
}
EXPORT_SYMBOL(core_tpg_deregister);

2
include/target/target_core_base.h
View File

@ -920,6 +920,8 @@ struct se_portal_group {
*/
int proto_id;
bool enabled;
/* RELATIVE TARGET PORT IDENTIFIER */
u16 tpg_rtpi;
/* Used for PR SPEC_I_PT=1 and REGISTER_AND_MOVE */
atomic_t tpg_pr_ref_count;
/* Spinlock for adding/removing ACLed Nodes */