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>

1 files changed, 3 insertions, 2 deletions

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index c41833e9c083..5950e12bd3ab 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);