netdev - Re: [PATCH] bonding: clean muticast addresses when bevice changes type

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Date:	Thu, 16 Jul 2009 13:57:59 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Moni Shoua <monis@...taire.com>
cc:	David Miller <davem@...emloft.net>,
	Roland Dreier <rdreier@...co.com>,
	bonding-devel@...ts.sourceforge.net,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] bonding: clean muticast addresses when bevice changes type

Moni Shoua <monis@...taire.com> wrote:

>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 <monis@...taire.com>

	I checked the discussion noted in a separate email, and the
rationale seems reasonable.

Signed-off-by: Jay Vosburgh <fubar@...ibm.com>


>
> 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",
--
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