netdev - Re: [PATCH net-next v2 0/2] bonding: ensure that the TSO being set on bond master

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Message-ID: <52D513B2.9060203@huawei.com>
Date:	Tue, 14 Jan 2014 18:38:42 +0800
From:	Ding Tianhong <dingtianhong@...wei.com>
To:	Veaceslav Falico <vfalico@...hat.com>
CC:	Jay Vosburgh <fubar@...ibm.com>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 0/2] bonding: ensure that the TSO being set
 on bond master

On 2014/1/14 17:47, Veaceslav Falico wrote:
> On Tue, Jan 14, 2014 at 05:00:07PM +0800, Ding Tianhong wrote:
>> The commit b0ce3508(bonding: allow TSO being set on bonding master)
>> has make the TSO being set for bond dev, but in some situation, if
>> the slave did not have the NETIF_F_SG features, the bond master will
>> miss the TSO features in netdev_fix_features because the TSO is
>> depended on SG. So I have to add SG and TSO features on bond master
>> together.
>>
>> The function netdev_add_tso_features() was only be used for bonding,
>> so no need to export it in netdevice.h, remove it and add it to bonding.
>>
>> v2: If the slave hw did not support SG features, the SG should not
>>    be forced open on master, otherwise error will occur, so modify it.
>>    Some slave may support SG but not open it yet, so the bond master
>>    could try to open it when adding the salve and make sure the TSO
>>    could be open on master.
> 
> So you're forcibly enabling SG on a slave? Usually SG is always enabled,
> unless there's a very specific reason for that - like a bug in hw/sw/fw,
> like performance improvement on specific use-cases etc. etc.
> 
> So that's a wrong thing to do - to try to enable it, if it was disabled.
> 

I don't think it is a wrong thing, just a slight changes of use, but your word
is reasonable, I will miss it.

> Nacked-by: Veaceslav Falico <vfalico@...hat.com>
> 



>>
>> Ding Tianhong (2):
>>  bonding: move the netdev_add_tso_features() to bonding
>>  bonding: try to enable SG features when adding a new slave
>>
>> drivers/net/bonding/bond_main.c | 27 ++++++++++++++++++++++++++-
>> include/linux/netdevice.h       | 10 ----------
>> 2 files changed, 26 insertions(+), 11 deletions(-)
>>
>> -- 
>> 1.8.0
>>
>>
> 
> 


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