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bonding: refine IFF_XMIT_DST_RELEASE capability 

Some workloads greatly benefit of IFF_XMIT_DST_RELEASE capability
on output net device, avoiding dirtying dst refcount.

bonding currently disables IFF_XMIT_DST_RELEASE unconditionally.

If all slaves have the IFF_XMIT_DST_RELEASE bit set, then
bonding master can also have it in its priv_flags

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jay Vosburgh <fubar@us.ibm.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-07-17 12:19:48 +00:00 committed by David S. Miller
parent 1817e83d6c
commit b6fe83e952
1 changed files with 5 additions and 0 deletions
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5
drivers/net/bonding/bond_main.c
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@ -1382,6 +1382,7 @@ static void bond_compute_features(struct bonding *bond)
netdev_features_t vlan_features = BOND_VLAN_FEATURES;
unsigned short max_hard_header_len = ETH_HLEN;
int i;
unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
read_lock(&bond->lock);
@ -1392,6 +1393,7 @@ static void bond_compute_features(struct bonding *bond)
vlan_features = netdev_increment_features(vlan_features,
slave->dev->vlan_features, BOND_VLAN_FEATURES);
dst_release_flag &= slave->dev->priv_flags;
if (slave->dev->hard_header_len > max_hard_header_len)
max_hard_header_len = slave->dev->hard_header_len;
}
@ -1400,6 +1402,9 @@ done:
bond_dev->vlan_features = vlan_features;
bond_dev->hard_header_len = max_hard_header_len;
flags = bond_dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
bond_dev->priv_flags = flags | dst_release_flag;
read_unlock(&bond->lock);
netdev_change_features(bond_dev);