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authorNicholas Bellinger <nab@linux-iscsi.org>2013-06-07 17:38:58 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2013-09-09 14:29:16 -0700
commitc0add7fd05ff99c3a516c78eb6b1e6460a3efdae (patch)
tree2aa45b7fe481134865e179caf631501bad811959 /include/target
parent798ab48eecdf659df9ae0064ca5c62626c651827 (diff)
downloadlinux-c0add7fd05ff99c3a516c78eb6b1e6460a3efdae.tar.bz2
target: Add transport_init_session_tags using per-cpu ida
This patch adds lib/idr.c based transport_init_session_tags() logic that allows fabric drivers to setup a per-cpu se_sess->sess_tag_pool and associated se_sess->sess_cmd_map for basic tagged pre-allocation of fabric descriptor sized memory. v5 changes: - Convert to percpu_ida.h include v4 changes: - Add transport_alloc_session_tags() for fabrics that need early transport_init_session() v3 changes: - Update to percpu-ida usage Cc: Kent Overstreet <kmo@daterainc.com> Cc: Asias He <asias@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Asias He <asias@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
-rw-r--r--include/target/target_core_base.h5
-rw-r--r--include/target/target_core_fabric.h3
2 files changed, 8 insertions, 0 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index e34fc904f2e1..bd55acd43005 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -5,6 +5,7 @@
#include <linux/configfs.h>
#include <linux/dma-mapping.h>
#include <linux/blkdev.h>
+#include <linux/percpu_ida.h>
#include <scsi/scsi_cmnd.h>
#include <net/sock.h>
#include <net/tcp.h>
@@ -415,6 +416,8 @@ struct se_cmd {
enum dma_data_direction data_direction;
/* For SAM Task Attribute */
int sam_task_attr;
+ /* Used for se_sess->sess_tag_pool */
+ unsigned int map_tag;
/* Transport protocol dependent state, see transport_state_table */
enum transport_state_table t_state;
unsigned cmd_wait_set:1;
@@ -536,6 +539,8 @@ struct se_session {
struct list_head sess_wait_list;
spinlock_t sess_cmd_lock;
struct kref sess_kref;
+ void *sess_cmd_map;
+ struct percpu_ida sess_tag_pool;
};
struct se_device;
diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 7a16178424f9..d559c36692af 100644
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -84,6 +84,9 @@ struct target_core_fabric_ops {
};
struct se_session *transport_init_session(void);
+int transport_alloc_session_tags(struct se_session *, unsigned int,
+ unsigned int);
+struct se_session *transport_init_session_tags(unsigned int, unsigned int);
void __transport_register_session(struct se_portal_group *,
struct se_node_acl *, struct se_session *, void *);
void transport_register_session(struct se_portal_group *,