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>
diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 1a13470..813e131 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c
@@ -733,12 +733,14 @@
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 @@
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);
}