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

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Message-ID: <20140114094741.GB20066@redhat.com>
Date:	Tue, 14 Jan 2014 10:47:41 +0100
From:	Veaceslav Falico <vfalico@...hat.com>
To:	Ding Tianhong <dingtianhong@...wei.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 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.

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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