From patchwork Mon Dec 16 17:20:29 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 301766 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E45052C00AA for ; Tue, 17 Dec 2013 04:20:45 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755186Ab3LPRUf (ORCPT ); Mon, 16 Dec 2013 12:20:35 -0500 Received: from smtp.citrix.com ([66.165.176.89]:25595 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754965Ab3LPRUd (ORCPT ); Mon, 16 Dec 2013 12:20:33 -0500 X-IronPort-AV: E=Sophos;i="4.95,496,1384300800"; d="scan'208";a="84998119" Received: from accessns.citrite.net (HELO FTLPEX01CL03.citrite.net) ([10.9.154.239]) by FTLPIPO01.CITRIX.COM with ESMTP; 16 Dec 2013 17:20:32 +0000 Received: from ukmail1.uk.xensource.com (10.80.16.128) by smtprelay.citrix.com (10.13.107.80) with Microsoft SMTP Server id 14.2.342.4; Mon, 16 Dec 2013 12:20:32 -0500 Received: from etemp.uk.xensource.com ([10.80.228.66] helo=etemp.uk.xensource.com.) by ukmail1.uk.xensource.com with esmtp (Exim 4.69) (envelope-from ) id 1VsbqK-00086o-81; Mon, 16 Dec 2013 17:20:32 +0000 From: Paul Durrant To: , CC: Paul Durrant , Wei Liu , Ian Campbell , David Vrabel Subject: [PATCH net-next] xen-netback: add gso_segs calculation Date: Mon, 16 Dec 2013 17:20:29 +0000 Message-ID: <1387214429-4778-1-git-send-email-paul.durrant@citrix.com> X-Mailer: git-send-email 1.7.10.4 MIME-Version: 1.0 X-DLP: MIA2 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org netback already has code which parses IPv4 and v6 headers to set up checksum offsets and these are always applied to GSO packets being sent from frontends. It's therefore suboptimal that GSOs are being marked SKB_GSO_DODGY to defer the gso_segs calculation when netback already has all necessary information to hand to do the calculation. This patch adds that calculation. Signed-off-by: Paul Durrant Cc: Wei Liu Cc: Ian Campbell Cc: David Vrabel --- drivers/net/xen-netback/netback.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c index 904e497..0af8d97 100644 --- a/drivers/net/xen-netback/netback.c +++ b/drivers/net/xen-netback/netback.c @@ -1043,10 +1043,7 @@ static int xenvif_set_skb_gso(struct xenvif *vif, } skb_shinfo(skb)->gso_size = gso->u.gso.size; - - /* Header must be checked, and gso_segs computed. */ - skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; - skb_shinfo(skb)->gso_segs = 0; + /* gso_segs will be calculated later */ return 0; } @@ -1582,6 +1579,18 @@ static int xenvif_tx_submit(struct xenvif *vif, int budget) skb_probe_transport_header(skb, 0); + /* If the packet is GSO then we will have just set up the + * transport header offset in checksum_setup so it's now + * straightforward to calculate gso_segs. + */ + if (skb_is_gso(skb)) { + int mss = skb_shinfo(skb)->gso_size; + int hdrlen = skb->transport_header + tcp_hdrlen(skb); + + skb_shinfo(skb)->gso_segs = + DIV_ROUND_UP(skb->len - hdrlen, mss); + } + vif->dev->stats.rx_bytes += skb->len; vif->dev->stats.rx_packets++;