Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e5a4a72d authored by Lennert Buytenhek's avatar Lennert Buytenhek Committed by David S. Miller
Browse files

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: default avatarLennert Buytenhek <buytenh@marvell.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid 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)