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Commit c5256c51 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

net: propagate NETIF_F_HIGHDMA to vlans 



Automatically allows vlans to get NETIF_F_HIGHDMA if underlying device
supports it.

On 32bit arches (and more precisely if CONFIG_HIGHMEM is enabled), it
can help to reduce cost of illegal_highdma() and __skb_linearize()
calls.

Tested on tg3 , bnx2, bonding, this worked very well.

This is a generalization of a patch provided by Yi Zou & Jeff Kirsher.

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bba50b99

net/core/dev.c

+4 −3
Original line number Diff line number Diff line
@@ -5058,10 +5058,11 @@ int register_netdevice(struct net_device *dev) 
	if (dev->features & NETIF_F_SG)

		dev->features |= NETIF_F_GSO;



	/* Enable GRO for vlans by default if dev->features has GRO also.

	 * vlan_dev_init() will do the dev->features check.

	/* Enable GRO and NETIF_F_HIGHDMA for vlans by default,

	 * vlan_dev_init() will do the dev->features check, so these features

	 * are enabled only if supported by underlying device.

	 */

	dev->vlan_features |= NETIF_F_GRO;

	dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);



	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);

	ret = notifier_to_errno(ret);