From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Subject: Re: [PATCH v12 0/6] add Tx preparation
Date: Wed, 7 Dec 2016 18:18:33 +0800
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Cc: "Yigit, Ferruh" <ferruh.yigit@intel.com>,
 Olivier Matz <olivier.matz@6wind.com>,
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 "dev@dpdk.org" <dev@dpdk.org>, Jan Medala <jan@semihalf.com>,
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 Yong Wang <yongwang@vmware.com>,
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 Hemant Agrawal <hemant.agrawal@nxp.com>,
 "Kulasek, TomaszX" <tomaszx.kulasek@intel.com>
To: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
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On Wed, Dec 07, 2016 at 10:13:14AM +0000, Ananyev, Konstantin wrote:
> 
> Hi Yliu,
> 
> > 
> > On Tue, Dec 06, 2016 at 03:53:42PM +0000, Ferruh Yigit wrote:
> > > > Please, we need a comment for each driver saying
> > > > "it is OK, we do not need any checksum preparation for TSO"
> > > > or
> > > > "yes we have to implement tx_prepare or TSO will not work in this mode"
> > > >
> > 
> > Sorry for late. For virtio, I think it's not a must. The checksum stuff
> > has been handled inside the Tx function. However, we may could move it
> > to tx_prepare, which would actually recover the performance lost
> > introduced while enabling TSO for the non-TSO case.
> > 
> 
> So would you like to provide a patch for it,
> Or would you like to keep tx_prepare() for virtio as NOP for now?

Hi Konstantin,

I'd keep it as it is for now. It should be a trivial patch after all, that
I could provide it when everything are settled down.

	--yliu