[PATCH 2/2][Trusty SRU](upstream) net: gso: use feature flag argument in all protocol gso handlers
Dave Chiluk
chiluk at canonical.com
Mon Sep 21 21:53:27 UTC 2015
From: Florian Westphal <fw at strlen.de>
BugLink: http://bugs.launchpad.net/bugs/1497048
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 <pshelar at nicira.com>
Signed-off-by: Florian Westphal <fw at strlen.de>
Signed-off-by: David S. Miller <davem at davemloft.net>
(back-ported from commit 1e16aa3ddf863c6b9f37eddf52503230a62dedb3)
Signed-off-by: Dave Chiluk <chiluk at canonical.com>
Conflicts:
net/ipv4/udp_offload.c
---
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(-)
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index f521bad..42dbe60 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1294,7 +1294,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
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);
diff --git a/net/ipv4/gre_offload.c b/net/ipv4/gre_offload.c
index cecc87e..829b690 100644
--- a/net/ipv4/gre_offload.c
+++ b/net/ipv4/gre_offload.c
@@ -72,7 +72,7 @@ static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
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);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 945c8c9..2e9fdaf 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2511,7 +2511,7 @@ struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
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,
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 8d5dccc..9eae47d 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -112,7 +112,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
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);
diff --git a/net/mpls/mpls_gso.c b/net/mpls/mpls_gso.c
index 851cd88..0c970cb 100644
--- a/net/mpls/mpls_gso.c
+++ b/net/mpls/mpls_gso.c
@@ -47,7 +47,7 @@ static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
__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);
--
1.9.1
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