netdev - [PATCH net-next] veth: extend features to support tunneling

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Date:	Fri, 25 Oct 2013 18:25:03 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, stephen@...workplumber.org,
	netdev@...r.kernel.org
Subject: [PATCH net-next] veth: extend features to support tunneling

From: Eric Dumazet <edumazet@...gle.com>

While investigating on a recent vxlan regression, I found veth
was using a zero features set for vxlan tunnels.

We have to segment GSO frames, copy the payload, and do the checksum.

This patch brings a ~200% performance increase

We probably have to add hw_enc_features support
on other virtual devices.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Alexei Starovoitov <ast@...mgrid.com>
---
 drivers/net/veth.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index b2d0347..b24db7a 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -261,6 +261,8 @@ static const struct net_device_ops veth_netdev_ops = {
 
 #define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO |    \
 		       NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_HIGHDMA | \
+		       NETIF_F_GSO_GRE | NETIF_F_GSO_UDP_TUNNEL |	    \
+		       NETIF_F_GSO_IPIP | NETIF_F_GSO_SIT | NETIF_F_UFO	|   \
 		       NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
 		       NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
 
@@ -279,6 +281,7 @@ static void veth_setup(struct net_device *dev)
 	dev->destructor = veth_dev_free;
 
 	dev->hw_features = VETH_FEATURES;
+	dev->hw_enc_features = VETH_FEATURES;
 }
 
 /*


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