diff mbox

[v4,06/14] RDS: use rds_send_xmit() state instead of RDS_LL_SEND_FULL

Message ID 1444233228-4481-7-git-send-email-santosh.shilimkar@oracle.com
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Santosh Shilimkar Oct. 7, 2015, 3:53 p.m. UTC 
In Transport indepedent rds_sendmsg(), we shouldn't make decisions based
on RDS_LL_SEND_FULL which is used to manage the ring for RDMA based
transports. We can safely issue rds_send_xmit() and the using its
return value take decision on deferred work. This will also fix
the scenario where at times we are seeing connections stuck with
the LL_SEND_FULL bit getting set and never cleared.

We kick krdsd after any time we see -ENOMEM or -EAGAIN from the
ring allocation code.

Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
---
 net/rds/send.c    | 10 ++++++----
 net/rds/threads.c |  2 ++
 2 files changed, 8 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/net/rds/send.c b/net/rds/send.c
index b0acd45..a081a64 100644
--- a/net/rds/send.c
+++ b/net/rds/send.c
@@ -1123,8 +1123,9 @@  int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len)
 	 */
 	rds_stats_inc(s_send_queued);
 
-	if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags))
-		rds_send_xmit(conn);
+	ret = rds_send_xmit(conn);
+	if (ret == -ENOMEM || ret == -EAGAIN)
+		queue_delayed_work(rds_wq, &conn->c_send_w, 1);
 
 	rds_message_put(rm);
 	return payload_len;
@@ -1180,8 +1181,9 @@  rds_send_pong(struct rds_connection *conn, __be16 dport)
 	rds_stats_inc(s_send_queued);
 	rds_stats_inc(s_send_pong);
 
-	if (!test_bit(RDS_LL_SEND_FULL, &conn->c_flags))
-		queue_delayed_work(rds_wq, &conn->c_send_w, 0);
+	ret = rds_send_xmit(conn);
+	if (ret == -ENOMEM || ret == -EAGAIN)
+		queue_delayed_work(rds_wq, &conn->c_send_w, 1);
 
 	rds_message_put(rm);
 	return 0;
diff --git a/net/rds/threads.c b/net/rds/threads.c
index dc2402e..454aa6d 100644
--- a/net/rds/threads.c
+++ b/net/rds/threads.c
@@ -162,7 +162,9 @@  void rds_send_worker(struct work_struct *work)
 	int ret;
 
 	if (rds_conn_state(conn) == RDS_CONN_UP) {
+		clear_bit(RDS_LL_SEND_FULL, &conn->c_flags);
 		ret = rds_send_xmit(conn);
+		cond_resched();
 		rdsdebug("conn %p ret %d\n", conn, ret);
 		switch (ret) {
 		case -EAGAIN: