[PATCH v4 06/14] RDS: use rds_send_xmit() state instead of RDS_LL_SEND_FULL
From: Santosh Shilimkar <hidden>
Date: 2015-10-07 15:57:49
Also in:
lkml
Subsystem:
networking [general], rds - reliable datagram sockets, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Allison Henderson, Linus Torvalds
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 <redacted> --- net/rds/send.c | 10 ++++++---- net/rds/threads.c | 2 ++ 2 files changed, 8 insertions(+), 4 deletions(-)
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:
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1.9.1