[PATCH 3.12 36/72] macvtap: unbreak receiving of gro skb with frag list

From	Jiri Slaby <jslaby@suse.cz>
Newsgroups	linux.kernel
Subject	[PATCH 3.12 36/72] macvtap: unbreak receiving of gro skb with frag list
Date	2015-11-23 14:20 +0100
Message-ID	<qxZce-2dc-31@gated-at.bofh.it> (permalink)
References	<qxZ2z-29g-35@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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From: Jason Wang <jasowang@redhat.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ Upstream commit f23d538bc24a83c16127c2eb82c9cf1adc2b5149 ]

We don't have fraglist support in TAP_FEATURES. This will lead
software segmentation of gro skb with frag list. Fixes by having
frag list support in TAP_FEATURES.

With this patch single session of netperf receiving were restored from
about 5Gb/s to about 12Gb/s on mlx4.

Fixes a567dd6252 ("macvtap: simplify usage of tap_features")
Cc: Vlad Yasevich <vyasevic@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/macvtap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 393873fb792e..ee53a9d06e8e 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -69,7 +69,7 @@ static const struct proto_ops macvtap_socket_ops;
 #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
 		      NETIF_F_TSO6 | NETIF_F_UFO)
 #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
-#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG)
+#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
 
 /*
  * RCU usage:
-- 
2.6.3

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[PATCH 3.12 36/72] macvtap: unbreak receiving of gro skb with frag list Jiri Slaby <jslaby@suse.cz> - 2015-11-23 14:20 +0100

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