[PATCH net-next v2 01/16] tipc: return early for non-blocking sockets at link congestion
From: Parthasarathy Bhuvaragan <hidden>
Date: 2016-11-01 13:02:34
Subsystem:
networking [general], the rest, tipc network layer · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Jon Maloy
Until now, in stream/mcast send() we pass the message to the link layer even when the link is congested and add the socket to the link's wakeup queue. This is unnecessary for non-blocking sockets. If a socket is set to non-blocking and sends multicast with zero back off time while receiving EAGAIN, we exhaust the memory. In this commit, we return immediately at stream/mcast send() for non-blocking sockets. Acked-by: Jon Maloy <redacted> Signed-off-by: Parthasarathy Bhuvaragan <redacted> --- net/tipc/socket.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index f9f5f3c3dab5..adf3e6ecf61e 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c@@ -697,6 +697,9 @@ static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, uint mtu; int rc; + if (!timeo && tsk->link_cong) + return -ELINKCONG; + msg_set_type(mhdr, TIPC_MCAST_MSG); msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); msg_set_destport(mhdr, 0);
@@ -1072,6 +1075,9 @@ static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz) } timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); + if (!timeo && tsk->link_cong) + return -ELINKCONG; + dnode = tsk_peer_node(tsk); skb_queue_head_init(&pktchain);
--
2.1.4
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