From mboxrd@z Thu Jan  1 00:00:00 1970
From: Olivier Matz <olivier.matz@6wind.com>
Subject: Re: [PATCH 2/6] doc: add mbuf reorg to PMD todo list
Date: Wed, 3 Jan 2018 15:00:09 +0100
Message-ID: <20180103140008.6p6lokleyb7cwtfo@platinum>
References: <20171121014241.61050-1-ferruh.yigit@intel.com>
 <20171121014241.61050-2-ferruh.yigit@intel.com>
 <20171229090749.144f8201@xeon-e3>
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Cc: Ferruh Yigit <ferruh.yigit@intel.com>,
 Thomas Monjalon <thomas@monjalon.net>,
 John McNamara <john.mcnamara@intel.com>, dev@dpdk.org
To: Stephen Hemminger <stephen@networkplumber.org>
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Hi,

On Fri, Dec 29, 2017 at 09:07:49AM -0800, Stephen Hemminger wrote:
> On Tue, 21 Nov 2017 01:42:37 +0000
> Ferruh Yigit <ferruh.yigit@intel.com> wrote:
> 
> > To track modification:
> > 8f094a9ac5d7 ("mbuf: set mbuf fields while in pool")
> > 
> > Proposed deadline for PMDs is v18.02
> > 
> > Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
> > ---
> >  doc/guides/nics/todo.rst | 19 ++++++++++++++-----
> >  1 file changed, 14 insertions(+), 5 deletions(-)
> > 
> > diff --git a/doc/guides/nics/todo.rst b/doc/guides/nics/todo.rst
> > index 874811ad5..b408fc691 100644
> > --- a/doc/guides/nics/todo.rst
> > +++ b/doc/guides/nics/todo.rst
> > @@ -36,8 +36,17 @@ This is the list for tracking required PMD changes triggered by library modifica
> >  
> >  .. table:: PMDs internal TODO list
> >  
> > - +------+------+----------+----------------+------+
> > - | TODO | PMDs | Deadline | Related Commit | Note |
> > - +======+======+==========+================+======+
> > - |      |      |          |                |      |
> > - +------+------+----------+----------------+------+
> > + +-------------------+--------------------------------+----------+----------------+-----------------------------------+
> > + | TODO              | PMDs                           | Deadline | Related Commit | Note                              |
> > + +===================+================================+==========+================+===================================+
> > + | mbuf organisation | | af_packet, ark, avp, bnx2x,  | v18.02   | 8f094a9ac5d7   | Remove unnecessary mbuf field     |
> > + |                   | | bnxt, bonding, cxgbe, dpaa,  |          |                | initialization.                   |
> > + |                   | | dpaa2, e1000, ena,           |          |                |                                   |
> > + |                   | | failsafe, fm10k,             |          |                |                                   |
> > + |                   | | kni, mlx4,                   |          |                |                                   |
> > + |                   | | mrvl, nfp, octeontx,         |          |                |                                   |
> > + |                   | | pcap, qede, ring, sfc,       |          |                |                                   |
> > + |                   | | softnic, szedata2, tap,      |          |                |                                   |
> > + |                   | | thunderx, vhost,             |          |                |                                   |
> > + |                   | | vmxnet3                      |          |                |                                   |
> > + +-------------------+--------------------------------+----------+----------------+-----------------------------------+
> 
> NAK
> 
> This open source, if the fix is trivial please just fix all the drivers directly now.
> These TODO lists never get done.

The fix is not that trivial, especially for vector PMDs.
It can also impact performance.

It looks dangerous for me to blindly do a patch without any hardware to
do the test.