Commit b6fe83e9 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <>
Cc: Jay Vosburgh <>
Cc: Andy Gospodarek <>
Cc: Tom Herbert <>
Signed-off-by: default avatarDavid S. Miller <>
parent 1817e83d
......@@ -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;
......@@ -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;
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