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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-09-23 00:46:11 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-26 18:27:15 -0700 |
| commit | c5256c51232d8312755e8de2b514c426b19b101a (patch) | |
| tree | 95312aa92634472fc2329032890203dfddd0b776 /net/core | |
| parent | bba50b99b2410e863b38afdcd0280eb37f8a8bcc (diff) | |
| download | linux-c5256c51232d8312755e8de2b514c426b19b101a.tar.gz linux-c5256c51232d8312755e8de2b514c426b19b101a.tar.bz2 linux-c5256c51232d8312755e8de2b514c426b19b101a.zip | |
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: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/dev.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 2c7934f8cf3e..e0c0b86f57a1 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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); |