# \[PATCH AUTOSEL 5.9 14/23\] vxlan: Copy needed\_tailroom from lowerdev - From: Sasha Levin \ - Date: 2020-12-12 16:39:13 - List: netdev - Page: https://ratatoskr.run/netdev/2020/12/6208628 - Thread: https://ratatoskr.run/stable/2020/12/6208610/t.md ```text From: Sven Eckelmann [ Upstream commit a5e74021e84bb5eadf760aaf2c583304f02269be ] 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 Link: https://lore.kernel.org/r/20201126125247.1047977-2-sven@narfation.org Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/vxlan.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 85c4a6bfc7c06..94e14238fb8a1 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -3804,6 +3804,8 @@ 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) -- 2.27.0 ```