Subject: Re: [PATCH net] bonding: set primary_reselect in LB and AB mode

From: Ding Tianhong <[email-masked]>
Date: Sat, 16 Nov 2013 09:50:42 +0800

于 2013/11/16 2:02, Jay Vosburgh 写道:
> Ding Tianhong <[email-masked]> wrote:
>
>> The primary_reselect only reselection for the primary slave,
>> but the primary slave only support for ALB, TLB and AB mode,
>> so we sould set the primary_reselect for these mode.
>>
>> to fix this: Add a check for ALB, TLB and AB mode in
>> bonding_store_primary_reselect, avoid to select active slave
>> again in other modes.
> 	I don't believe that setting primary_reselect in a
> !USES_PRIMARY() mode has any negative effects.  It doesn't do anything,
> but also doesn't break anything.  Is there a case that setting
> primary_reselect causes misbehavior in a !USES_PRIMARY() mode?

I see it will call bond_select_active_slave and I will think more about it,
if I could not find any problem about it, will miss this patch.
thanks.

Regards
Ding

> 	Presuming that primary_reselect doesn't break things, this just
> adds an ordering limitation when configuring bonding (mode must be set
> prior to primary_reselect).  I don't believe this change adds any value,
> and may break existing configuration scripts.
>
> 	-J
>
>> Signed-off-by: Ding Tianhong <[email-masked]>
>> ---
>> drivers/net/bonding/bond_sysfs.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
>> index 47749c9..cac2291 100644
>> --- a/drivers/net/bonding/bond_sysfs.c
>> +++ b/drivers/net/bonding/bond_sysfs.c
>> @@ -1141,6 +1141,13 @@ static ssize_t bonding_store_primary_reselect(struct device *d,
>> 	if (!rtnl_trylock())
>> 		return restart_syscall();
>>
>> +	if (!USES_PRIMARY(bond->params.mode)) {
>> +		pr_info("%s: Unable to set primary reselect; %s is in mode %d\n",
>> +			bond->dev->name, bond->dev->name, bond->params.mode);
>> +		ret = -EINVAL;
>> +		goto out;
>> +	}
>> +
>> 	new_value = bond_parse_parm(buf, pri_reselect_tbl);
>> 	if (new_value < 0)  {
>> 		pr_err("%s: Ignoring invalid primary_reselect value %.*s.\n",
>> -- 
>> 1.7.12

> ---
> 	-Jay Vosburgh, IBM Linux Technology Center, [email-masked]
>
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