From patchwork Tue Jun 25 22:20:10 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamal Mostafa X-Patchwork-Id: 254486 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) by ozlabs.org (Postfix) with ESMTP id BA25E2C0040 for ; Wed, 26 Jun 2013 08:24:20 +1000 (EST) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1Urben-0004EL-To; Tue, 25 Jun 2013 22:24:13 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by huckleberry.canonical.com with esmtp (Exim 4.76) (envelope-from ) id 1Urbav-0001uJ-4w for kernel-team@lists.ubuntu.com; Tue, 25 Jun 2013 22:20:13 +0000 Received: from c-67-160-231-42.hsd1.ca.comcast.net ([67.160.231.42] helo=fourier) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1Urbau-0002Dp-Pl; Tue, 25 Jun 2013 22:20:13 +0000 Received: from kamal by fourier with local (Exim 4.80) (envelope-from ) id 1Urbas-00058Q-NO; Tue, 25 Jun 2013 15:20:10 -0700 From: Kamal Mostafa To: Eric Dumazet Subject: [ 3.8.y.z extended stable ] Patch "tcp: xps: fix reordering issues" has been added to staging queue Date: Tue, 25 Jun 2013 15:20:10 -0700 Message-Id: <1372198810-19705-1-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.8.1.2 X-Extended-Stable: 3.8 Cc: Kamal Mostafa , kernel-team@lists.ubuntu.com, Yuchung Cheng , Neal Cardwell , "David S. Miller" , Tom Herbert X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.14 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: kernel-team-bounces@lists.ubuntu.com This is a note to let you know that I have just added a patch titled tcp: xps: fix reordering issues to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue This patch is scheduled to be released in version 3.8.13.4. If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.8.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Kamal ------ From 0c3a4be9d9a0934eb95b4d73c22cdb9558c3691c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 23 May 2013 07:44:20 +0000 Subject: tcp: xps: fix reordering issues [ Upstream commit 547669d483e5783d722772af1483fa474da7caf9 ] commit 3853b5841c01a ("xps: Improvements in TX queue selection") introduced ooo_okay flag, but the condition to set it is slightly wrong. In our traces, we have seen ACK packets being received out of order, and RST packets sent in response. We should test if we have any packets still in host queue. Signed-off-by: Eric Dumazet Cc: Tom Herbert Cc: Yuchung Cheng Cc: Neal Cardwell Signed-off-by: David S. Miller Signed-off-by: Kamal Mostafa --- net/ipv4/tcp_output.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) -- 1.8.1.2 diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index a9f50ee..18b6e16 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -1032,11 +1032,13 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it, &md5); tcp_header_size = tcp_options_size + sizeof(struct tcphdr); - if (tcp_packets_in_flight(tp) == 0) { + if (tcp_packets_in_flight(tp) == 0) tcp_ca_event(sk, CA_EVENT_TX_START); - skb->ooo_okay = 1; - } else - skb->ooo_okay = 0; + + /* if no packet is in qdisc/device queue, then allow XPS to select + * another queue. + */ + skb->ooo_okay = sk_wmem_alloc_get(sk) == 0; skb_push(skb, tcp_header_size); skb_reset_transport_header(skb);