From: Eric Dumazet Date: Tue, 17 Jul 2012 12:19:48 +0000 (+0000) Subject: bonding: refine IFF_XMIT_DST_RELEASE capability X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b6fe83e9525a;p=linux-beck.git 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 Cc: Jay Vosburgh Cc: Andy Gospodarek Cc: Tom Herbert Signed-off-by: David S. Miller --- diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 1eb3979d0af5..3960b1b26178 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -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);