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vxlan: Copy needed_tailroom from lowerdev 

While vxlan doesn't need any extra tailroom, the lowerdev might need it. In
that case, copy it over to reduce the chance for additional (re)allocations
in the transmit path.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Link: https://lore.kernel.org/r/20201126125247.1047977-2-sven@narfation.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Sven Eckelmann 2020-11-26 13:52:47 +01:00 committed by Jakub Kicinski
parent 0a35dc41fe
commit a5e74021e8
1 changed files with 2 additions and 0 deletions
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2
drivers/net/vxlan.c
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@ -3800,6 +3800,8 @@ static void vxlan_config_apply(struct net_device *dev,
needed_headroom = lowerdev->hard_header_len;
needed_headroom += lowerdev->needed_headroom;
dev->needed_tailroom = lowerdev->needed_tailroom;
max_mtu = lowerdev->mtu - (use_ipv6 ? VXLAN6_HEADROOM :
VXLAN_HEADROOM);
if (max_mtu < ETH_MIN_MTU)