[PATCH] udp : increments sk_drops in __udp_queue_rcv_skb()

[Eric Dumazet <dada1@cosmosbay.com>]

Hi David

While investigating with Kenny Chang multicast drops problems, I found sk_drops
field was not anymore updated in current kernels for UDP IPV4 sockets.

Thank you

[PATCH] udp: increments sk_drops in __udp_queue_rcv_skb()

Commit 93821778def10ec1e69aa3ac10adee975dad4ff3
(udp: Fix rcv socket locking) accidentally removed sk_drops increments for
UDP IPV4 sockets.

This field can be used to detect incorrect sizing of socket receive buffers.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
---
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index b7faffe..997c418 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1015,9 +1015,11 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 
 	if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
 		/* Note that an ENOMEM error is charged twice */
-		if (rc == -ENOMEM)
+		if (rc == -ENOMEM) {
 			UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
 					 is_udplite);
+			atomic_inc(&sk->sk_drops);
+		}
 		goto drop;
 	}