netdev - Re: [PATCH net] bonding: reset the slave's mtu when its be changed

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Message-ID: <52D49CE1.6040900@huawei.com>
Date:	Tue, 14 Jan 2014 10:11:45 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Veaceslav Falico <vfalico@...hat.com>
CC:	Jay Vosburgh <fubar@...ibm.com>, Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net] bonding: reset the slave's mtu when its be changed

On 2014/1/12 13:18, Ding Tianhong wrote:
> On 2014/1/10 20:19, Veaceslav Falico wrote:
>> On Fri, Jan 10, 2014 at 07:32:51PM +0800, Ding Tianhong wrote:
>>> All slave should have the same mtu with mastet's, and the bond do it when
>>> enslave the slave, but the user could change the slave's mtu, it will cause
>>> the master and slave have different mtu, althrough in AB mode, it does not
>>> matter if the slave is not the current slave, but in other mode, it is incorrect,
>>> so reset the slave's mtu like the master set.
>>
>> Why "net"? It's not a bugfix, it's a feature, and really discussable.
>>
>> Also, wrt the actual change - why do you think it's incorrect for slaves in
>> bonding mode other than AB to have different MTU values? I don't see any
>> reason for it, from the top of the head.
>>
> 
> Ok, I will test more situation for every mode when slave's mtu changed, I am not sure
> what will happened yet, if some links was interrupt, I thinks it is a bug. 
> 
>>>

I have test several mode for bonding when the slave mtu changed:

RR(0)	0<mtu<1500 		ok
AB(1)	0<mtu<1500		loss packets
XOR(2)	0<mtu<1500		ok
Broadcast(3)	0<mtu<1500	ok
LACP		0<mtu<1500	loss packets


so I think we should not let the mtu set for slave.

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