netdev - [PATCH v2] net: rfs: enable RFS before first data packet is received

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Date:	Fri, 17 Jun 2011 15:45:15 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	bhutchings@...arflare.com, therbert@...gle.com,
	netdev@...r.kernel.org, hadi@...erus.ca
Subject: [PATCH v2] net: rfs: enable RFS before first data packet is
 received

Le jeudi 16 juin 2011 à 23:38 -0400, David Miller a écrit :
> From: Ben Hutchings <bhutchings@...arflare.com>
> Date: Fri, 17 Jun 2011 00:50:46 +0100
> 
> > On Wed, 2011-06-15 at 04:15 +0200, Eric Dumazet wrote:
> >> @@ -1594,6 +1594,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
> >>  			goto discard;
> >>  
> >>  		if (nsk != sk) {
> >> +			sock_rps_save_rxhash(nsk, skb->rxhash);
> >>  			if (tcp_child_process(sk, nsk, skb)) {
> >>  				rsk = nsk;
> >>  				goto reset;
> >> 
> > 
> > I haven't tried this, but it looks reasonable to me.
> > 
> > What about IPv6?  The logic in tcp_v6_do_rcv() looks very similar.
> 
> Indeed ipv6 side needs the same fix.
> 
> Eric please add that part and resubmit.  And in fact I might stick
> this into net-2.6 instead of net-next-2.6
> 

OK, here is the net-2.6 based one then, thanks !

[PATCH v2] net: rfs: enable RFS before first data packet is received

First packet received on a passive tcp flow is not correctly RFS
steered.

One sock_rps_record_flow() call is missing in inet_accept()

But before that, we also must record rxhash when child socket is setup.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Tom Herbert <therbert@...gle.com>
CC: Ben Hutchings <bhutchings@...arflare.com>
CC: Jamal Hadi Salim <hadi@...erus.ca>
---
V2: add ipv6 support, as Ben noticed.

 net/ipv4/af_inet.c  |    1 +
 net/ipv4/tcp_ipv4.c |    1 +
 net/ipv6/tcp_ipv6.c |    1 +
 3 files changed, 3 insertions(+)

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 9c19260..eae1f67 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -676,6 +676,7 @@ int inet_accept(struct socket *sock, struct socket *newsock, int flags)
 
 	lock_sock(sk2);
 
+	sock_rps_record_flow(sk2);
 	WARN_ON(!((1 << sk2->sk_state) &
 		  (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
 
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a7d6671..708dc20 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1589,6 +1589,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
 			goto discard;
 
 		if (nsk != sk) {
+			sock_rps_save_rxhash(nsk, skb->rxhash);
 			if (tcp_child_process(sk, nsk, skb)) {
 				rsk = nsk;
 				goto reset;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index d1fd287..87551ca 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1644,6 +1644,7 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
 		 * the new socket..
 		 */
 		if(nsk != sk) {
+			sock_rps_save_rxhash(nsk, skb->rxhash);
 			if (tcp_child_process(sk, nsk, skb))
 				goto reset;
 			if (opt_skb)


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