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>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 55fa3fbb80f1790c2bda4c8503a64db3ab724d41..032f78261913d3a9df8933f43d6fa7478d296067 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -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)