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authorLennert Buytenhek <buytenh@marvell.com>2008-08-03 01:23:10 -0700
committerDavid S. Miller <davem@davemloft.net>2008-08-03 01:23:10 -0700
commite5a4a72d4f88f4389e9340d383ca67031d1b8536 (patch)
tree487fe8cf472a5b47007830a2666120c8ea5df51c
parent745e203164a9057e0de769ff4649e6e455daf753 (diff)
downloadop-kernel-dev-e5a4a72d4f88f4389e9340d383ca67031d1b8536.zip
op-kernel-dev-e5a4a72d4f88f4389e9340d383ca67031d1b8536.tar.gz
net: use software GSO for SG+CSUM capable netdevices
If a netdevice does not support hardware GSO, allowing the stack to use GSO anyway and then splitting the GSO skb into MSS-sized pieces as it is handed to the netdevice for transmitting is likely still a win as far as throughput and/or CPU usage are concerned, since it reduces the number of trips through the output path. This patch enables the use of GSO on any netdevice that supports SG. If a GSO skb is then sent to a netdevice that supports SG but does not support hardware GSO, net/core/dev.c:dev_hard_start_xmit() will take care of doing the necessary GSO segmentation in software. Signed-off-by: Lennert Buytenhek <buytenh@marvell.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/dev.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index da7acac..cbf8009 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3988,6 +3988,10 @@ int register_netdevice(struct net_device *dev)
}
}
+ /* Enable software GSO if SG is supported. */
+ if (dev->features & NETIF_F_SG)
+ dev->features |= NETIF_F_GSO;
+
netdev_initialize_kobject(dev);
ret = netdev_register_kobject(dev);
if (ret)
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