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authorFelix Fietkau <nbd@openwrt.org>2015-03-16 04:19:09 +0000
committerFelix Fietkau <nbd@openwrt.org>2015-03-16 04:19:09 +0000
commitd5b99a2d741447d5fe4c89013d607d52c699273b (patch)
tree42ee0330b42943885d63b7905ef748e8b5654f45 /target/linux/generic/patches-4.0
parent270bc6427b89c996ec7eb657dc66f20e4a3b297b (diff)
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kernel: add missing description for GRO optimization patch
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 44798
Diffstat (limited to 'target/linux/generic/patches-4.0')
-rw-r--r--target/linux/generic/patches-4.0/680-net-skip-gro-for-otherhost-packets.patch14
1 files changed, 14 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.0/680-net-skip-gro-for-otherhost-packets.patch b/target/linux/generic/patches-4.0/680-net-skip-gro-for-otherhost-packets.patch
index fc3625848b..62e0bde8dd 100644
--- a/target/linux/generic/patches-4.0/680-net-skip-gro-for-otherhost-packets.patch
+++ b/target/linux/generic/patches-4.0/680-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
@@ -4005,6 +4005,9 @@ static enum gro_result dev_gro_receive(s