Commit c86d8c53 authored Oct 23, 2015 by Jason Wang Committed by Sasha Levin Dec 03, 2015

macvtap: unbreak receiving of gro skb with frag list



[ 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 a567dd62 ("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: Sasha Levin <sasha.levin@oracle.com>

parent 8e05f5d8

drivers/net/macvtap.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -68,7 +68,7 @@ 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)
		#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)

		static struct macvlan_dev macvtap_get_vlan_rcu(const struct net_device dev)
		{