From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:59774 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964876AbbI2PW7 (ORCPT ); Tue, 29 Sep 2015 11:22:59 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pravin B Shelar , Florian Westphal , "David S. Miller" , Jay Vosburgh Subject: [PATCH 3.14 75/84] net: gso: use feature flag argument in all protocol gso handlers Date: Tue, 29 Sep 2015 17:19:07 +0200 Message-Id: <20150929145334.313690176@linuxfoundation.org> In-Reply-To: <20150929145330.924730721@linuxfoundation.org> References: <20150929145330.924730721@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: stable-owner@vger.kernel.org List-ID: 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Florian Westphal [ Upstream commit 1e16aa3ddf863c6b9f37eddf52503230a62dedb3 ] skb_gso_segment() has a 'features' argument representing offload features available to the output path. A few handlers, e.g. GRE, instead re-fetch the features of skb->dev and use those instead of the provided ones when handing encapsulation/tunnels. Depending on dev->hw_enc_features of the output device skb_gso_segment() can then return NULL even when the caller has disabled all GSO feature bits, as segmentation of inner header thinks device will take care of segmentation. This e.g. affects the tbf scheduler, which will silently drop GRE-encap GSO skbs that did not fit the remaining token quota as the segmentation does not work when device supports corresponding hw offload capabilities. Cc: Pravin B Shelar Signed-off-by: Florian Westphal Signed-off-by: David S. Miller [jay.vosburgh: backported to 3.14. ] Signed-off-by: Jay Vosburgh Signed-off-by: Greg Kroah-Hartman --- net/ipv4/af_inet.c | 2 +- net/ipv4/gre_offload.c | 2 +- net/ipv4/udp.c | 2 +- net/ipv6/ip6_offload.c | 2 +- net/mpls/mpls_gso.c | 2 +- 5 files changed, 5 insertions(+), 5 deletions(-) --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1291,7 +1291,7 @@ static struct sk_buff *inet_gso_segment( encap = SKB_GSO_CB(skb)->encap_level > 0; if (encap) - features = skb->dev->hw_enc_features & netif_skb_features(skb); + features &= skb->dev->hw_enc_features; SKB_GSO_CB(skb)->encap_level += ihl; skb_reset_transport_header(skb); --- a/net/ipv4/gre_offload.c +++ b/net/ipv4/gre_offload.c @@ -69,7 +69,7 @@ static struct sk_buff *gre_gso_segment(s skb->mac_len = skb_inner_network_offset(skb); /* segment inner packet. */ - enc_features = skb->dev->hw_enc_features & netif_skb_features(skb); + enc_features = skb->dev->hw_enc_features & features; segs = skb_mac_gso_segment(skb, enc_features); if (!segs || IS_ERR(segs)) { skb_gso_error_unwind(skb, protocol, ghl, mac_offset, mac_len); --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -2517,7 +2517,7 @@ struct sk_buff *skb_udp_tunnel_segment(s skb->protocol = htons(ETH_P_TEB); /* segment inner packet. */ - enc_features = skb->dev->hw_enc_features & netif_skb_features(skb); + enc_features = skb->dev->hw_enc_features & features; segs = skb_mac_gso_segment(skb, enc_features); if (!segs || IS_ERR(segs)) { skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset, --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -112,7 +112,7 @@ static struct sk_buff *ipv6_gso_segment( encap = SKB_GSO_CB(skb)->encap_level > 0; if (encap) - features = skb->dev->hw_enc_features & netif_skb_features(skb); + features &= skb->dev->hw_enc_features; SKB_GSO_CB(skb)->encap_level += sizeof(*ipv6h); ipv6h = ipv6_hdr(skb); --- a/net/mpls/mpls_gso.c +++ b/net/mpls/mpls_gso.c @@ -47,7 +47,7 @@ static struct sk_buff *mpls_gso_segment( __skb_push(skb, skb->mac_len); /* Segment inner packet. */ - mpls_features = skb->dev->mpls_features & netif_skb_features(skb); + mpls_features = skb->dev->mpls_features & features; segs = skb_mac_gso_segment(skb, mpls_features);