netdev - Re: [PATCH net 2/3] bonding:check mode when modify primary

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Date:	Mon, 11 Jun 2012 23:13:28 +0200
From:	Nicolas de Pesloüan 
	<nicolas.2p.debian@...il.com>
To:	Jay Vosburgh <fubar@...ibm.com>
CC:	Weiping Pan <wpan@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net 2/3] bonding:check mode when modify primary_reselect

Le 11/06/2012 22:56, Jay Vosburgh a écrit :
> Nicolas de Pesloüan 	<nicolas.2p.debian@...il.com>  wrote:
>
>> Le 11/06/2012 11:00, Weiping Pan a écrit :
>>> Using a primary_reselect only makes sense in active backup, TLB or ALB modes.
>>>
>>> Signed-off-by: Weiping Pan<wpan@...hat.com>
>>> ---
>>>    drivers/net/bonding/bond_sysfs.c |    7 +++++++
>>>    1 files changed, 7 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
>>> index 485bedb..1b0f3cd 100644
>>> --- a/drivers/net/bonding/bond_sysfs.c
>>> +++ b/drivers/net/bonding/bond_sysfs.c
>>> @@ -1123,6 +1123,13 @@ static ssize_t bonding_store_primary_reselect(struct device *d,
>>>    	if (!rtnl_trylock())
>>>    		return restart_syscall();
>>>
>>> +	if (!USES_PRIMARY(bond->params.mode)) {
>>> +		pr_err("%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",
>>
>>
>> May I suggest we only issue a warning, store the new value for
>> primary_reselect, and avoid calling bond_select_active_slave(bond), if
>> !USE_PRIMARY(bond->params.mode)?
>>
>> That way, we do not add one more constraint on the order one must write into sysfs.
>
> 	I'm not in favor of changing anything here.  There's already a
> message that primary_reselect is being changed, I think that's
> sufficient.  The other similar cases don't issue warnings, e.g., setting
> xmit_hash_policy doesn't complain if the mode is not one that utilizes
> the hash.

Agreed. Calling bond_select_active_slave(bond) looks safe, even for mode that does not use primary, 
so we don't need to change anything.

Would you support other patch similar to 1/3 in this thread, that try to relax the order to write 
into sysfs for bonding?

	Nicolas
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