netdev - Re: Detecting backup slaves of bonding interface in network driver

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Date:	Fri, 12 Dec 2008 08:37:45 -0800
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Poornima Kamath <poornimak@...ab.com>
cc:	netdev@...r.kernel.org
Subject: Re: Detecting backup slaves of bonding interface in network driver

Poornima Kamath <poornimak@...ab.com> wrote:

>The driver creates virtual interfaces that talk to ethernet interfaces over
>infiniband,  using an infiniband to ethernet gateway device.
>The gateway device sends data to all interfaces having same mac address.  For
>this the driver needs to explicitly tell the gateway device not to send data to
>the backup slaves.
>Therefore the driver needs to  know which slaves are backup slaves.
>The failover mac option  works well,  but it is present for kernels greater
>than 2.6.24.  So this option is not available for distros like RHEL5, SLES10
>etc

	I believe that RHEL5 and SLES10 contain an "ib-bonding" package
which includes a backport of the current (or at least a more current)
bonding driver specifically for use over Infiniband.  I think it's also
got a couple of other patches to bonding that aren't in the mainline.
In any event, it has the fail_over_mac functionality.

	Have you looked at ib-bonding?

>So in order to support these distros I need some way of identifying the backup
>slaves.
>Is it ok to check the IFF_SLAVE_INACTIVE flags for these distros?

	It will do what you want (identify backup slaves), and is not
guaranteed to be available in the future.  I doubt that the flag would
ever go away on RHEL5 or SLES10, but, again, no guarantee.

	-J

---
	-Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
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