From: Xin Long <lucien....@gmail.com>
Upstream commit:
commit c122fda271717f4fc618e0a31e833941fd5f1efd
Author: Xin Long <lucien....@gmail.com>
Date: Sun Oct 1 22:00:55 2017 +0800
ip_gre: set tunnel hlen properly in erspan_tunnel_init
According to __gre_tunnel_init, tunnel->hlen should be set as the
headers' length between inner packet and outer iphdr.
It would be used especially to calculate a proper mtu when updating
mtu in tnl_update_pmtu. Now without setting it, a bigger mtu value
than expected would be updated, which hurts performance a lot.
This patch is to fix it by setting tunnel->hlen with:
tunnel->tun_hlen + tunnel->encap_hlen + sizeof(struct erspanhdr)
Fixes: 84e54fe0a5ea ("gre: introduce native tunnel support for ERSPAN")
Signed-off-by: Xin Long <lucien....@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Cc: Xin Long <lucien....@gmail.com>
Signed-off-by: Greg Rose <gvrose8...@gmail.com>
---
datapath/linux/compat/ip_gre.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/datapath/linux/compat/ip_gre.c b/datapath/linux/compat/ip_gre.c
index 1a8dc76..70c6a9f 100644
--- a/datapath/linux/compat/ip_gre.c
+++ b/datapath/linux/compat/ip_gre.c
@@ -1044,7 +1044,9 @@ static int erspan_tunnel_init(struct net_device *dev)
tunnel->tun_hlen = 8;
tunnel->parms.iph.protocol = IPPROTO_GRE;
- t_hlen = tunnel->hlen + sizeof(struct iphdr) + sizeof(struct erspanhdr);
+ tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen +
+ sizeof(struct erspanhdr);
+ t_hlen = tunnel->hlen + sizeof(struct iphdr);
dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4;
dev->mtu = ETH_DATA_LEN - t_hlen - 4;
--
1.8.3.1
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