From d5b99a2d741447d5fe4c89013d607d52c699273b Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Mon, 16 Mar 2015 04:19:09 +0000
Subject: kernel: add missing description for GRO optimization patch

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 44798
---
 .../680-net-skip-gro-for-otherhost-packets.patch           | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'target/linux/generic/patches-3.19/680-net-skip-gro-for-otherhost-packets.patch')

diff --git a/target/linux/generic/patches-3.19/680-net-skip-gro-for-otherhost-packets.patch b/target/linux/generic/patches-3.19/680-net-skip-gro-for-otherhost-packets.patch
index e3fa917..292d021 100644
--- a/target/linux/generic/patches-3.19/680-net-skip-gro-for-otherhost-packets.patch
+++ b/target/linux/generic/patches-3.19/680-net-skip-gro-for-otherhost-packets.patch
@@ -1,3 +1,17 @@
+Subject: NET: skip GRO for otherhost packets
+
+For network drivers using napi_gro_receive, packets are run through GRO,
+even when the destination MAC address does not match, and they're supposed
+to be delivered to another host behind a different bridge port.
+
+This can be very expensive, because for drivers without TSO or scatter-
+gather, this can only be undone by copying the skb and checksumming it
+again.
+
+Fix this by leaving skbs with PACKET_OTHERHOST untouched.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
 --- a/net/core/dev.c
 +++ b/net/core/dev.c
 @@ -3967,6 +3967,9 @@ static enum gro_result dev_gro_receive(s
-- 
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