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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>
This commit is contained in:
Lennert Buytenhek 2008-08-03 01:23:10 -07:00 committed by David S. Miller
parent 745e203164
commit e5a4a72d4f
1 changed files with 4 additions and 0 deletions
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4
net/core/dev.c
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@ -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)