netdev - [PATCH v3 net-next] net: Update RFS target at poll for tcp/udp

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Date:	Fri, 31 May 2013 16:15:38 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	David Majnemer <majnemer@...gle.com>,
	Paul Turner <pjt@...gle.com>, Tom Herbert <therbert@...gle.com>
Subject: [PATCH v3 net-next] net: Update RFS target at poll for tcp/udp

From: David Majnemer <majnemer@...gle.com>

The current state of affairs is that read()/write() will setup
RFS (Receive Flow Steering) for internet protocol sockets while
poll()/epoll() does not.

When poll() gets called with a TCP or UDP socket, we should update
the flow target.

This permits to RFS (if enabled) to select the appropriate CPU for
following incoming packets.

Note: Only connected UDP sockets can benefit from RFS.

Signed-off-by: David Majnemer <majnemer@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Paul Turner <pjt@...gle.com>
Cc: Tom Herbert <therbert@...gle.com>
---
 net/ipv4/tcp.c |    2 ++
 net/ipv4/udp.c |    2 ++
 2 files changed, 4 insertions(+)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 1f58594..b5d4ad9 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -436,6 +436,8 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 	struct sock *sk = sock->sk;
 	const struct tcp_sock *tp = tcp_sk(sk);
 
+	sock_rps_record_flow(sk);
+
 	sock_poll_wait(file, sk_sleep(sk), wait);
 	if (sk->sk_state == TCP_LISTEN)
 		return inet_csk_listen_poll(sk);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index aa5eff4..c7338ec 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1967,6 +1967,8 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
 	unsigned int mask = datagram_poll(file, sock, wait);
 	struct sock *sk = sock->sk;
 
+	sock_rps_record_flow(sk);
+
 	/* Check for false positives due to checksum errors */
 	if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
 	    !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk))


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