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[net-next PATCH 2/5] net: Call sk_mark_napi_id() in the ACK receive path




From: Sridhar Samudrala <sridhar.samudrala@xxxxxxxxx>

Call sk_mark_napi_id() in the ACK receive path of a TCP_NEW_SYN_RECV
socket, so that sk->napi_id is set even if the socket hasn't yet received
any data.  With this change we should be able to start busy polling
slightly earlier.

Signed-off-by: Sridhar Samudrala <sridhar.samudrala@xxxxxxxxx>
Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxx>
---
 net/ipv4/tcp_ipv4.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 08d870e45658..b86002a296f1 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1687,6 +1687,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 			tcp_v4_send_reset(nsk, skb);
 			goto discard_and_relse;
 		} else {
+			sk_mark_napi_id(nsk, skb);
 			sock_put(sk);
 			return 0;
 		}