netdev - Re: [PATCH v3 net-next 02/12] bonding: permit using arp

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Date:	Mon, 17 Feb 2014 14:48:29 +0100
From:	Nikolay Aleksandrov <nikolay@...hat.com>
To:	Veaceslav Falico <vfalico@...hat.com>, netdev@...r.kernel.org
CC:	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH v3 net-next 02/12] bonding: permit using arp_validate
 with non-ab modes

On 02/17/2014 02:39 PM, Veaceslav Falico wrote:
> Currently it's diabled because it's sometimes hard, in typical configs, to
> make it work - because of the nature how the loadbalance modes work - as
> it's hard to deliver valid arp replies to correct slaves by the switch.
> 
> However we still can use arp_validation in loadbalance in several other
> configs, per example with arp_validate == 2 for backup with one broadcast
> domain, without the switch(es) doing any balancing - this way we'd be (a
> bit more) sure that the slave is up.
> 
> So, enable it to let users decide which one works/suits them best.
> 
> CC: Jay Vosburgh <fubar@...ibm.com>
> CC: Andy Gospodarek <andy@...yhouse.net>
> Signed-off-by: Veaceslav Falico <vfalico@...hat.com>
> ---
>  Documentation/networking/bonding.txt | 6 +++---
>  drivers/net/bonding/bond_main.c      | 4 ----
>  2 files changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
> index 5cdb229..96b4ad8 100644
> --- a/Documentation/networking/bonding.txt
> +++ b/Documentation/networking/bonding.txt
> @@ -270,9 +270,9 @@ arp_ip_target
>  arp_validate
>  
>  	Specifies whether or not ARP probes and replies should be
> -	validated in the active-backup mode.  This causes the ARP
> -	monitor to examine the incoming ARP requests and replies, and
> -	only consider a slave to be up if it is receiving the
> +	validated in any mode that supports arp monitoring.  This causes
> +	the ARP monitor to examine the incoming ARP requests and replies,
> +	and only consider a slave to be up if it is receiving the
>  	appropriate ARP traffic.
>  
>  	Possible values are:
> diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
> index 3c50bec..91c0248 100644
> --- a/drivers/net/bonding/bond_main.c
> +++ b/drivers/net/bonding/bond_main.c
> @@ -4183,10 +4183,6 @@ static int bond_check_params(struct bond_params *params)
>  	}
>  
>  	if (arp_validate) {
> -		if (bond_mode != BOND_MODE_ACTIVEBACKUP) {
> -			pr_err("arp_validate only supported in active-backup mode\n");
> -			return -EINVAL;
> -		}
>  		if (!arp_interval) {
>  			pr_err("arp_validate requires arp_interval\n");
>  			return -EINVAL;
> 
Hi Slava,
After the option conversion patches to the new API I think you should modify the
.unsuppmodes of BOND_OPT_ARP_VALIDATE in bond_options.c in order to allow it to
be set in non-ab modes. Take a look at how BOND_OPT_PRIMARY is done for example.

Cheers,
 Nik
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