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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 <sbohrer@rgmadvisors.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shawn Bohrer 2013-10-07 11:01:38 -05:00 committed by David S. Miller
parent 2c8c8e6f9d
commit 005ec97433
2 changed files with 6 additions and 4 deletions
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5
net/ipv4/udp.c
View File

@ -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);

5
net/ipv6/udp.c
View File

@ -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);