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iscsi-target: Convert to per-cpu ida_alloc + ida_free command map

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This patch changes iscsi-target to use transport_alloc_session_tags()
pre-allocation logic for per-cpu session tag pooling with internal
ida_alloc() + ida_free() calls based upon the saved se_cmd->map_tag id.

This includes tag pool setup based upon per NodeACL queue_depth after
locating se_node_acl in iscsi_target_locate_portal().

Also update iscsit_allocate_cmd() and iscsit_release_cmd() to use
percpu_ida_alloc() and percpu_ida_free() respectively.

v5 changes;
  - Convert to percpu_ida.h include

v2 changes:
  - Fix bug with SessionType=Discovery in iscsi_target_locate_portal()

Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Kent Overstreet <kmo@daterainc.com>
Signed-off-by: Nicholas Bellinger <nab@daterainc.com>
This commit is contained in:
Nicholas Bellinger
2013-08-17 15:49:08 -07:00
committed by Nicholas Bellinger
parent d703ce2f7f
commit 988e3a8546
3 changed files with 46 additions and 11 deletions
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28
drivers/target/iscsi/iscsi_target_nego.c
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@@ -983,8 +983,9 @@ int iscsi_target_locate_portal(
struct iscsi_tiqn *tiqn;
struct iscsi_tpg_np *tpg_np = NULL;
struct iscsi_login_req *login_req;
u32 payload_length;
int sessiontype = 0, ret = 0;
struct se_node_acl *se_nacl;
u32 payload_length, queue_depth = 0;
int sessiontype = 0, ret = 0, tag_num, tag_size;
INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
@@ -1084,7 +1085,7 @@ int iscsi_target_locate_portal(
goto out;
}
ret = 0;
goto out;
goto alloc_tags;
}
get_target:
@@ -1181,8 +1182,27 @@ get_target:
ret = -1;
goto out;
}
se_nacl = sess->se_sess->se_node_acl;
queue_depth = se_nacl->queue_depth;
/*
* Setup pre-allocated tags based upon allowed per NodeACL CmdSN
* depth for non immediate commands, plus extra tags for immediate
* commands.
*
* Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
* in per-cpu-ida tag allocation logic + small queue_depth.
*/
alloc_tags:
tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
tag_num += ISCSIT_EXTRA_TAGS;
tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
ret = 0;
ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
if (ret < 0) {
iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
ISCSI_LOGIN_STATUS_NO_RESOURCES);
ret = -1;
}
out:
kfree(tmpbuf);
return ret;