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net: ipv6/gre: Add GRO support 

Add GRO capability for IPv6 GRE tunnel and ip6erspan tap, via gro_cells
infrastructure.

Performance testing: 55% higher badwidth.
Measuring bandwidth of 1 thread IPv4 TCP traffic over IPv6 GRE tunnel
while GRO on the physical interface is disabled.
CPU: Intel Xeon E312xx (Sandy Bridge)
NIC: Mellanox Technologies MT27700 Family [ConnectX-4]
Before (GRO not working in tunnel) : 2.47 Gbits/sec
After  (GRO working in tunnel)     : 3.85 Gbits/sec

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
CC: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eran Ben Elisha 2018-05-07 10:45:27 +03:00 committed by David S. Miller
parent 6f2f8212bf
commit 0c1dd2a162
1 changed files with 27 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
net/ipv6/ip6_gre.c
View File

@ -1314,6 +1314,7 @@ static void ip6gre_dev_free(struct net_device *dev)
{
struct ip6_tnl *t = netdev_priv(dev);
gro_cells_destroy(&t->gro_cells);
dst_cache_destroy(&t->dst_cache);
free_percpu(dev->tstats);
}
@ -1381,11 +1382,12 @@ static int ip6gre_tunnel_init_common(struct net_device *dev)
return -ENOMEM;
ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
if (ret) {
free_percpu(dev->tstats);
dev->tstats = NULL;
return ret;
}
if (ret)
goto cleanup_alloc_pcpu_stats;
ret = gro_cells_init(&tunnel->gro_cells, dev);
if (ret)
goto cleanup_dst_cache_init;
tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
@ -1405,6 +1407,13 @@ static int ip6gre_tunnel_init_common(struct net_device *dev)
ip6gre_tnl_init_features(dev);
return 0;
cleanup_dst_cache_init:
dst_cache_destroy(&tunnel->dst_cache);
cleanup_alloc_pcpu_stats:
free_percpu(dev->tstats);
dev->tstats = NULL;
return ret;
}
static int ip6gre_tunnel_init(struct net_device *dev)
@ -1751,11 +1760,12 @@ static int ip6erspan_tap_init(struct net_device *dev)
return -ENOMEM;
ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
if (ret) {
free_percpu(dev->tstats);
dev->tstats = NULL;
return ret;
}
if (ret)
goto cleanup_alloc_pcpu_stats;
ret = gro_cells_init(&tunnel->gro_cells, dev);
if (ret)
goto cleanup_dst_cache_init;
tunnel->tun_hlen = 8;
tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
@ -1773,6 +1783,13 @@ static int ip6erspan_tap_init(struct net_device *dev)
ip6gre_tnl_link_config(tunnel, 1);
return 0;
cleanup_dst_cache_init:
dst_cache_destroy(&tunnel->dst_cache);
cleanup_alloc_pcpu_stats:
free_percpu(dev->tstats);
dev->tstats = NULL;
return ret;
}
static const struct net_device_ops ip6erspan_netdev_ops = {