netdev - [PATCH 2/2] vxlan: Copy needed

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Message-Id: <20201126125247.1047977-2-sven@narfation.org>
Date:   Thu, 26 Nov 2020 13:52:47 +0100
From:   Sven Eckelmann <sven@...fation.org>
To:     netdev@...r.kernel.org
Cc:     b.a.t.m.a.n@...ts.open-mesh.org, linux-kernel@...r.kernel.org,
        Sven Eckelmann <sven@...fation.org>
Subject: [PATCH 2/2] 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@...fation.org>
---
 drivers/net/vxlan.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 25b5b5a2dfea..44bb02122526 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -3801,6 +3801,8 @@ 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)
-- 
2.29.2