Commit e5a4a72d authored by Lennert Buytenhek's avatar Lennert Buytenhek Committed by David S. Miller
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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: default avatarLennert Buytenhek <>
Signed-off-by: default avatarHerbert Xu <>
Signed-off-by: default avatarDavid S. Miller <>
parent 745e2031
......@@ -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;
ret = netdev_register_kobject(dev);
if (ret)
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