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>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/core/dev.c b/net/core/dev.c
index da7acacf02b5..cbf80098980c 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)