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geneve: initialize needed_headroom

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Currently the needed_headroom field for the geneve device is left
to the default value.

This patch set it to space required for basic geneve encapsulation,
so that we can avoid the skb head re-allocation on xmit.

This give a 6% speedup for unsegment traffic on geneve tunnel.

v1 -> v2:
  - add ETH_HLEN for the lower device to the needed headroom

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2015-12-23 16:54:27 +01:00 committed by David S. Miller
parent c1a9a291ce
commit 184fc8b5ee
1 changed files with 9 additions and 1 deletions
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10
drivers/net/geneve.c
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@ -1155,7 +1155,7 @@ static int geneve_configure(struct net *net, struct net_device *dev,
struct geneve_net *gn = net_generic(net, geneve_net_id);
struct geneve_dev *t, *geneve = netdev_priv(dev);
bool tun_collect_md, tun_on_same_port;
int err;
int err, encap_len;
if (!remote)
return -EINVAL;
@ -1187,6 +1187,14 @@ static int geneve_configure(struct net *net, struct net_device *dev,
if (t)
return -EBUSY;
/* make enough headroom for basic scenario */
encap_len = GENEVE_BASE_HLEN + ETH_HLEN;
if (remote->sa.sa_family == AF_INET)
encap_len += sizeof(struct iphdr);
else
encap_len += sizeof(struct ipv6hdr);
dev->needed_headroom = encap_len + ETH_HLEN;
if (metadata) {
if (tun_on_same_port)
return -EPERM;