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team: refine IFF_XMIT_DST_RELEASE capability 

Cloned patch of Eric Dumazet for bonding.

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

team currently disables IFF_XMIT_DST_RELEASE unconditionally.

If all ports have the IFF_XMIT_DST_RELEASE bit set, then
team dev can also have it in its priv_flags.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2012-07-18 07:39:38 +00:00 committed by David S. Miller
parent f150bd7f8c
commit dc9059512c
1 changed files with 5 additions and 0 deletions
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5
drivers/net/team/team.c
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@ -733,12 +733,14 @@ static void __team_compute_features(struct team *team)
struct team_port *port;
u32 vlan_features = TEAM_VLAN_FEATURES;
unsigned short max_hard_header_len = ETH_HLEN;
unsigned int flags, dst_release_flag = IFF_XMIT_DST_RELEASE;
list_for_each_entry(port, &team->port_list, list) {
vlan_features = netdev_increment_features(vlan_features,
port->dev->vlan_features,
TEAM_VLAN_FEATURES);
dst_release_flag &= port->dev->priv_flags;
if (port->dev->hard_header_len > max_hard_header_len)
max_hard_header_len = port->dev->hard_header_len;
}
@ -746,6 +748,9 @@ static void __team_compute_features(struct team *team)
team->dev->vlan_features = vlan_features;
team->dev->hard_header_len = max_hard_header_len;
flags = team->dev->priv_flags & ~IFF_XMIT_DST_RELEASE;
team->dev->priv_flags = flags | dst_release_flag;
netdev_change_features(team->dev);
}