Commit e5a4a72d authored Aug 03, 2008 by Lennert Buytenhek Committed by David S. Miller Aug 03, 2008

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>

parent 745e2031

net/core/dev.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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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