netdev - [net-next PATCH 2/5] net: Call sk_mark_napi

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Date:   Thu, 16 Mar 2017 11:32:44 -0700
From:   Alexander Duyck <alexander.duyck@...il.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     sridhar.samudrala@...el.com, edumazet@...gle.com,
        davem@...emloft.net
Subject: [net-next PATCH 2/5] net: Call sk_mark_napi_id() in the ACK receive
 path

From: Sridhar Samudrala <sridhar.samudrala@...el.com>

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@...el.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
---
 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;
 		}