From mboxrd@z Thu Jan 1 00:00:00 1970 From: Moni Shoua Subject: [PATCH] bonding: clean muticast addresses when bevice changes type Date: Wed, 15 Jul 2009 17:56:31 +0300 Message-ID: <4A5DEE1F.4090707@Voltaire.COM> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: David Miller , Roland Dreier , bonding-devel@lists.sourceforge.net, netdev To: Jay Vosburgh Return-path: Received: from fwil.voltaire.com ([193.47.165.2]:20415 "EHLO exil.voltaire.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755214AbZGOO4t (ORCPT ); Wed, 15 Jul 2009 10:56:49 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Bonding device forbids slave device of different types under the same master. However, it is possible for a bonding master to change type during its lifetime. This can be either from ARPHRD_ETHER to ARPHRD_INFINIBAND or the other way arround. The change of type requires device level multicast address cleanup because device level multicast addresses depend on the device type. The patch adds a call to dev_close() before the bonding master changes type and dev_open() just after that. In the example below I enslaved an IPoIB device (ib0) under bond0. Since each bonding master starts as device of type ARPHRD_ETHER by default, a change of type occurs when ib0 is enslaved. This is how /proc/net/dev_mcast looks like without the patch 5 bond0 1 0 00ffffffff12601bffff000000000001ff96ca05 5 bond0 1 0 01005e000116 5 bond0 1 0 01005e7ffffd 5 bond0 1 0 01005e000001 5 bond0 1 0 333300000001 6 ib0 1 0 00ffffffff12601bffff000000000001ff96ca05 6 ib0 1 0 333300000001 6 ib0 1 0 01005e000001 6 ib0 1 0 01005e7ffffd 6 ib0 1 0 01005e000116 6 ib0 1 0 00ffffffff12401bffff00000000000000000001 6 ib0 1 0 00ffffffff12601bffff00000000000000000001 and this is how it looks like after the patch. 5 bond0 1 0 00ffffffff12601bffff000000000001ff96ca05 5 bond0 1 0 00ffffffff12601bffff00000000000000000001 5 bond0 1 0 00ffffffff12401bffff0000000000000ffffffd 5 bond0 1 0 00ffffffff12401bffff00000000000000000116 5 bond0 1 0 00ffffffff12401bffff00000000000000000001 6 ib0 1 0 00ffffffff12601bffff000000000001ff96ca05 6 ib0 1 0 00ffffffff12401bffff00000000000000000116 6 ib0 1 0 00ffffffff12401bffff0000000000000ffffffd 6 ib0 2 0 00ffffffff12401bffff00000000000000000001 6 ib0 2 0 00ffffffff12601bffff00000000000000000001 Signed-off-by: Moni Shoua -- drivers/net/bonding/bond_main.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index d927f71..aa1be1f 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1459,8 +1459,16 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) * ether type (eg ARPHRD_ETHER and ARPHRD_INFINIBAND) share the same bond */ if (bond->slave_cnt == 0) { - if (slave_dev->type != ARPHRD_ETHER) - bond_setup_by_slave(bond_dev, slave_dev); + if (bond_dev->type != slave_dev->type) { + dev_close(bond_dev); + pr_debug("%s: change device type from %d to %d\n", + bond_dev->name, bond_dev->type, slave_dev->type); + if (slave_dev->type != ARPHRD_ETHER) + bond_setup_by_slave(bond_dev, slave_dev); + else + ether_setup(bond_dev); + dev_open(bond_dev); + } } else if (bond_dev->type != slave_dev->type) { pr_err(DRV_NAME ": %s ether type (%d) is different " "from other slaves (%d), can not enslave it.\n",