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kernel: add missing description for GRO optimization patch

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

SVN-Revision: 44798
This commit is contained in:
Felix Fietkau 2015-03-16 04:19:09 +00:00
parent 270bc6427b
commit d5b99a2d74
3 changed files with 42 additions and 0 deletions
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14
target/linux/generic/patches-3.18/680-net-skip-gro-for-otherhost-packets.patch
View file

@ -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 --- a/net/core/dev.c
+++ b/net/core/dev.c +++ b/net/core/dev.c
@@ -4003,6 +4003,9 @@ static enum gro_result dev_gro_receive(s @@ -4003,6 +4003,9 @@ static enum gro_result dev_gro_receive(s

14
target/linux/generic/patches-3.19/680-net-skip-gro-for-otherhost-packets.patch
View file

@ -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 --- a/net/core/dev.c
+++ b/net/core/dev.c +++ b/net/core/dev.c
@@ -3967,6 +3967,9 @@ static enum gro_result dev_gro_receive(s @@ -3967,6 +3967,9 @@ static enum gro_result dev_gro_receive(s

14
target/linux/generic/patches-4.0/680-net-skip-gro-for-otherhost-packets.patch
View file

@ -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 --- a/net/core/dev.c
+++ b/net/core/dev.c +++ b/net/core/dev.c
@@ -4005,6 +4005,9 @@ static enum gro_result dev_gro_receive(s @@ -4005,6 +4005,9 @@ static enum gro_result dev_gro_receive(s