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From: Thomas Monjalon <thomas@monjalon.net>
To: Matan Azrad <matan@mellanox.com>,
	Andrew Rybchenko <arybchenko@solarflare.com>,
	Olivier Matz <olivier.matz@6wind.com>,
	Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: dev@dpdk.org, Ferruh Yigit <ferruh.yigit@intel.com>,
	Konstantin Ananyev <konstantin.ananyev@intel.com>
Subject: Re: [dpdk-dev] [PATCH 2/2] doc: announce new mbuf field for LRO
Date: Mon, 25 May 2020 01:41:51 +0200	[thread overview]
Message-ID: <3071401.IZAg4H9azB@thomas> (raw)
In-Reply-To: <4359580.12Q4qOoiY3@xps>

10/08/2019 23:31, Thomas Monjalon:
> 06/08/2019 20:17, Andrew Rybchenko:
> > On 8/6/19 5:56 PM, Matan Azrad wrote:
> > > The API breakage is because the ``tso_segsz`` field was documented for
> > > LRO.
> > >
> > > The ``tso_segsz`` field in mbuf indicates the size of each segment in
> > > the LRO packet in Rx path and should be provided by the LRO packet
> > > port.
> > >
> > > While the generic LRO packet may aggregate different segments sizes in
> > > one packet, it is impossible to expose this information for each segment
> > > by one field and it doesn't make sense to expose all the segments sizes
> > > in the mbuf.
> > >
> > > A new field may be added as union with the above field to expose the
> > > number of segments aggregated in the LRO packet.
> > >
> > > Signed-off-by: Matan Azrad <matan@mellanox.com>
> > > ---
> > > --- a/doc/guides/rel_notes/deprecation.rst
> > > +++ b/doc/guides/rel_notes/deprecation.rst
> > > +* mbuf: Remove ``tso_segsz`` mbuf field providing for LRO support. Use union
> > > +  block for the field memory to be shared with a new field ``lro_segs_n``
> > > +  indicates the number of segments aggregated in the LRO packet.
> > 
> > I think that the number of segments is more logical in the case of LRO.
> > The question (already asked by Konstantin) is why it is needed at all
> > (statistics?). If so, it still makes sense.
> > 
> > Segment size is misleading here, since not all segments
> > could be the same size. So,
> > 
> > Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>
> > 
> > As far as I can see bnxt and qede do not fill it in.
> > mlx5 and vmxnet3 have the number of segments (vmxnet3 has segment
> > size sometimes and sometimes use a function to guess the value).
> > So both will win from the change.
> > It looks like virtio does not have number of segments. CC Maxime to
> > comment.
> 
> I support improving the API for LRO.
> Unfortunately, the consensus is not strong enough at the moment.

We had no progress about LRO field in mbuf.
Is it a change we would like to have in 20.11?



  reply	other threads:[~2020-05-24 23:41 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-06 14:56 [dpdk-dev] [PATCH 1/2] doc: announce ethdev ABI change for LRO fields Matan Azrad
2019-08-06 14:56 ` [dpdk-dev] [PATCH 2/2] doc: announce new mbuf field for LRO Matan Azrad
2019-08-06 15:58   ` Ananyev, Konstantin
2019-08-06 18:50     ` Matan Azrad
2019-08-07 10:17       ` Ananyev, Konstantin
2019-08-07 12:35         ` Matan Azrad
2019-08-07 14:18           ` Ananyev, Konstantin
2019-08-08 10:16             ` Matan Azrad
2019-08-08 10:48               ` Ananyev, Konstantin
2019-08-08 11:16                 ` Matan Azrad
2019-08-08 16:26                   ` Ananyev, Konstantin
2019-08-06 18:17   ` Andrew Rybchenko
2019-08-10 21:31     ` Thomas Monjalon
2020-05-24 23:41       ` Thomas Monjalon [this message]
2020-06-02  6:49         ` Matan Azrad
2020-07-27  8:00           ` Olivier Matz
2020-07-27  8:41             ` Matan Azrad
2020-07-27  9:07               ` Olivier Matz
2023-06-12 16:38   ` Stephen Hemminger
2019-08-06 15:27 ` [dpdk-dev] [PATCH 1/2] doc: announce ethdev ABI change for LRO fields Andrew Rybchenko
2019-08-10 21:40   ` Thomas Monjalon

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