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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 <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: default avatarDavid S. Miller <davem@davemloft.net>
parent 1817e83d

drivers/net/bonding/bond_main.c

+5 −0
Original line number Diff line number Diff line
@@ -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 @@ static void bond_compute_features(struct bonding *bond) 
	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);