netdev - Re: [PATCH 8/8] bonding: Add "follow" option to fail_over

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Date:	Thu, 22 May 2008 07:09:19 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Jay Vosburgh <fubar@...ibm.com>
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH 8/8] bonding: Add "follow" option to fail_over_mac

Jay Vosburgh wrote:
> 	Add a "follow" selection for fail_over_mac.  This option
> causes the MAC address to move from slave to slave as the active
> slave changes.  This is in addition to the existing fail_over_mac option
> that causes the bond's MAC address to change during failover.
> 
> 	This new option is useful for devices that cannot tolerate
> multiple ports using the same MAC address simultaneously, either
> because it confuses them or incurs a performance penalty (as is the
> case with some LPAR-aware multiport devices).  Because the MAC of the
> bond itself does not change, the "follow" option is slightly more
> reliable during failover and doesn't change the MAC of the bond during
> operation.
> 
> 	This patch requires a previous ARP monitor change to properly
> handle RTNL during failovers.
> 
> Signed-off-by: Jay Vosburgh <fubar@...ibm.com>
> ---
>  Documentation/networking/bonding.txt |   96 ++++++++++++------
>  drivers/net/bonding/bond_main.c      |  185 ++++++++++++++++++++++++++-------
>  drivers/net/bonding/bond_sysfs.c     |   36 +++----
>  drivers/net/bonding/bonding.h        |    4 +
>  4 files changed, 232 insertions(+), 89 deletions(-)

applied 1-8


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