From: Sven Eckelmann sven@narfation.org
[ 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 sven@narfation.org Link: https://lore.kernel.org/r/20201126125247.1047977-2-sven@narfation.org Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/vxlan.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index c21f28840f05b..94a9add2fc878 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -3186,6 +3186,8 @@ 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)