From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
This patch adds lib/tag.c based transport_init_session_tagpool() 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.
Cc: Kent Overstreet <koverstreet@xxxxxxxxxx>
Cc: Roland Dreier <roland@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Asias He <asias@xxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Or Gerlitz <ogerlitz@xxxxxxxxxxxx>
Cc: Moussa Ba <moussaba@xxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
---
drivers/target/target_core_transport.c | 33 ++++++++++++++++++++++++++++++++
include/target/target_core_base.h | 5 ++++
include/target/target_core_fabric.h | 1 +
3 files changed, 39 insertions(+), 0 deletions(-)
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index abb7e40..4715f97 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -228,6 +228,35 @@ struct se_session *transport_init_session(void)
}
EXPORT_SYMBOL(transport_init_session);
+struct se_session *transport_init_session_tagpool(unsigned int tag_num,
+ unsigned int tag_size)
+{
+ struct se_session *se_sess;
+ int rc;
+
+ se_sess = transport_init_session();
+ if (IS_ERR(se_sess))
+ return se_sess;
+
+ se_sess->sess_cmd_map = kzalloc(tag_num * tag_size, GFP_KERNEL);
+ if (!se_sess->sess_cmd_map) {
+ pr_err("Unable to allocate se_sess->sess_cmd_map\n");
+ transport_free_session(se_sess);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ rc = tag_pool_init(&se_sess->sess_tag_pool, tag_num);
+ if (rc < 0) {
+ pr_err("Unable to init se_sess->sess_tag_pool,"
+ " tag_num: %u\n", tag_num);
+ transport_free_session(se_sess);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return se_sess;
+}
+EXPORT_SYMBOL(transport_init_session_tagpool);
+
/*
* Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
*/
@@ -363,6 +392,10 @@ EXPORT_SYMBOL(transport_deregister_session_configfs);
void transport_free_session(struct se_session *se_sess)
{
+ if (se_sess->sess_cmd_map) {
+ tag_pool_free(&se_sess->sess_tag_pool);
+ kfree(se_sess->sess_cmd_map);
+ }
kmem_cache_free(se_sess_cache, se_sess);
}
EXPORT_SYMBOL(transport_free_session);
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index a5c97db..8afd995 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/tags.h>
#include <scsi/scsi_cmnd.h>
#include <net/sock.h>
#include <net/tcp.h>
@@ -422,6 +423,8 @@ 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;
@@ -542,6 +545,8 @@ struct se_session {
struct list_head sess_cmd_list;
spinlock_t sess_cmd_lock;
struct kref sess_kref;
+ void *sess_cmd_map;
+ struct tag_pool sess_tag_pool;
};
struct se_device;
diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index ba3471b..318520b 100644
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -84,6 +84,7 @@ struct target_core_fabric_ops {
};
struct se_session *transport_init_session(void);
+struct se_session *transport_init_session_tagpool(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 *,
--
1.7.2.5
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