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-rw-r--r--target/linux/generic/patches-3.19/680-net-skip-gro-for-otherhost-packets.patch14
1 files changed, 14 insertions, 0 deletions
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 e3fa9172e2..292d02174a 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