ip_gre headroom allocation
From: Timo Teräs <hidden>
Date: 2009-06-11 08:22:34
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
I'm not entirely sure about this, but shouldn't we do something like the below to make ip_gre allocation enough headroom for paths where e.g. xfrm transformations take place (as a speed optimization)?
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index e62510d..eb78dd9 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c@@ -812,7 +812,7 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) tunnel->err_count = 0; } - max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; + max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->u.dst.header_len; if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {