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vxlan: Copy needed_tailroom from lowerdev

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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)