From 005ec9743394010cd37d86c3fd2e81978231cdbf Mon Sep 17 00:00:00 2001 From: Shawn Bohrer Date: Mon, 7 Oct 2013 11:01:38 -0500 Subject: [PATCH] udp: Only allow busy read/poll on connected sockets UDP sockets can receive packets from multiple endpoints and thus may be received on multiple receive queues. Since packets packets can arrive on multiple receive queues we should not mark the napi_id for all packets. This makes busy read/poll only work for connected UDP sockets. This additionally enables busy read/poll for UDP multicast packets as long as the socket is connected by moving the check into __udp_queue_rcv_skb(). Signed-off-by: Shawn Bohrer Suggested-by: Eric Dumazet Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/udp.c | 5 +++-- net/ipv6/udp.c | 5 +++-- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index c41833e..5950e12 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1405,8 +1405,10 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) { int rc; - if (inet_sk(sk)->inet_daddr) + if (inet_sk(sk)->inet_daddr) { sock_rps_save_rxhash(sk, skb); + sk_mark_napi_id(sk, skb); + } rc = sock_queue_rcv_skb(sk, skb); if (rc < 0) { @@ -1716,7 +1718,6 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, if (sk != NULL) { int ret; - sk_mark_napi_id(sk, skb); ret = udp_queue_rcv_skb(sk, skb); sock_put(sk); diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 8119791..3753247 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -549,8 +549,10 @@ static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) { int rc; - if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) + if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) { sock_rps_save_rxhash(sk, skb); + sk_mark_napi_id(sk, skb); + } rc = sock_queue_rcv_skb(sk, skb); if (rc < 0) { @@ -844,7 +846,6 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, if (sk != NULL) { int ret; - sk_mark_napi_id(sk, skb); ret = udpv6_queue_rcv_skb(sk, skb); sock_put(sk); -- 2.7.4