From: Ori Kam <orika@nvidia.com>
To: Jerin Jacob <jerinjacobk@gmail.com>,
Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Cc: Ivan Malov <ivan.malov@arknetworks.am>,
"NBU-Contact-Thomas Monjalon (EXTERNAL)" <thomas@monjalon.net>,
Ivan Malov <ivan.malov@oktetlabs.ru>,
Ferruh Yigit <ferruh.yigit@amd.com>,
Nithin Kumar Dabilpuram <ndabilpuram@marvell.com>,
Aman Singh <aman.deep.singh@intel.com>,
Yuying Zhang <yuying.zhang@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>,
Hanumanth Reddy Pothula <hpothula@marvell.com>,
Slava Ovsiienko <viacheslavo@nvidia.com>,
Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
"david.marchand@redhat.com" <david.marchand@redhat.com>
Subject: RE: [EXT] Re: [PATCH v5 2/2] app/testpmd: add command to process Rx metadata negotiation
Date: Wed, 1 Feb 2023 09:00:34 +0000 [thread overview]
Message-ID: <MW2PR12MB4666D916B9F9BBD8C1DA3A77D6D19@MW2PR12MB4666.namprd12.prod.outlook.com> (raw)
In-Reply-To: <CALBAE1PDCnavrMutKqQuOQiz4dUweyqst+BcuuNQQE=NCmMV8A@mail.gmail.com>
Hi all,
Sorry for jumping in late,
> -----Original Message-----
> From: Jerin Jacob <jerinjacobk@gmail.com>
> Sent: Wednesday, 1 February 2023 10:53
>
> On Wed, Feb 1, 2023 at 12:46 PM Andrew Rybchenko
> <andrew.rybchenko@oktetlabs.ru> wrote:
> >
> > On 2/1/23 09:10, Ivan Malov wrote:
> > > Hello everyone,
> > >
> > > Since making automatic, or implicit, offload decisions does
> > > not belong in testpmd responsibility domain, it should be
> > > safer to avoid calling the "negotiate metadata delivery"
> > > API with some default selection unless the user asks to
> > > do so explicitly, via internal CLI or app options.
> > >
> > > With that in mind, port config <port_id> ... sounds OK.
> > >
> > > PMDs that support flow primitives which can generate metadata
> > > but, if in started state, can't enable its delivery may pass
> > > appropriate rte_error messages to the user suggesting
> > > they enable delivery of such metadata from NIC to PMD
> > > first. This way, if the person operating testpmd
> > > enters a flow create command and that fails,
> > > they can figure out the inconsistency, stop
> > > the port, negotiate, start and try again.
> > >
> > > As for non-debug applications, their developers shall
> > > be properly informed about the problem of enabling
> > > delivery of metadata from NIC to PMD. This way,
> > > they will invoke the negotiate API by default
> > > in their apps, with the feature selection (eg.
> > > MARK) as per nature of the app's business.
> > >
> > > This API should indeed be helpful to some PMDs with
> > > regard to collecting upfront knowledge like this.
> > > At the same time, should be benign to those PMDs
> > > who do not need this knowledge and can enable
> > > delivery of metadata right when inserting the
> > > flow rules. So I hope the API does not create
> > > too much discomfort to vendors not needing it.
> > >
> > > Thank you.
> > >
> > > On Wed, 1 Feb 2023, Thomas Monjalon wrote:
> > >
> > >> 31/01/2023 17:17, Jerin Jacob:
> > >>> On Fri, Jan 27, 2023 at 8:31 PM Thomas Monjalon
> <thomas@monjalon.net>
> > >>> wrote:
> > >>>>
> > >>>> 27/01/2023 11:42, Nithin Kumar Dabilpuram:
> > >>>>> From: Thomas Monjalon <thomas@monjalon.net>
> > >>>>>> 27/01/2023 06:02, Nithin Kumar Dabilpuram:
> > >>>>>>> From: Thomas Monjalon <thomas@monjalon.net>
> > >>>>>>>> Ferruh is proposing to have a command "port config <port_id>
> ..."
> > >>>>>>>> to configure the flags to negotiate.
> > >>>>>>>> Are you OK with this approach?
> > >>>>>>>
> > >>>>>>> Yes, we are fine to have such command to enable and disable the
> > >>>>>>> feature
> > >>>>>>> with default being it disabled if supported by PMD.
> > >>>>>>> Is default being disabled fine if the feature is supported by a
> > >>>>>>> PMD ?
> > >>>>>>
> > >>>>>> I think the default should be enabled for ease of use.
> > >>>>>
> > >>>>> Since testpmd is used extensively for benchmarking purposes, we
> > >>>>> thought it should have minimum features
> > >>>>> enabled by default. The default testpmd doesn't have any Rx/Tx
> > >>>>> offloads enabled(except for FAST FREE), default
> > >>>>> fwd mode being "iofwd" and the Rx metadata is only referenced
> when
> > >>>>> dumping packets.
> > >>>>>
> > >>>>>
> > >>>>>> Do we have similar features disables by default?
> > >>>>>> I mean do we know features in testpmd which require a "double
> > >>>>>> enablement"
> > >>>>>> like one configuration command + one rte_flow rule?
> > >>>>>
> > >>>>> Spec itself is that way i.e "RTE_FLOW_RULE +
> > >>>>> RX_METADATA_NEGOTIATE(once)"
> > >>>>>
> > >>>>> Isn't it enough if
> > >>>>>
> > >>>>> #1 We have enough print when rte_flow is being create without
> > >>>>> negotiation done and ask user to enable rx metadata using
> > >>>>> "port config <port_id>..."
> > >>>>> #2 Provide testpmd app arg to enable Rx metadata(for example "
> > >>>>> --rx-metadata") like other features to avoid calling another
> > >>>>> command before rte flow create.
> > >>>>
> > >>>> I'm not sure what is best.
> > >>>> I will let others discuss this part.
> > >>>
> > >>> IMO, enabling something always defeat the purpose to negotiate. IMO,
> > >>> someone needs to negotiate
> > >>> for a feature if the feature is needed. I think, the double enablement
> > >>> is part of the spec itself. In case, The PMD
> > >>> drivers won't like double enablement, no need to implement the PMD
> > >>> callback. That way, there is no change in the existing flow.
> > >>>
> > >>> The reason why cnxk driver thought of leveraging negotiate() feature
> > >>> so that it helps for optimization. e.s.p
> > >>> function template for multiprocess case as we know what features
> > >>> needed in fastpath upfront.
> > >>>
> > >>> If there still concerns with patch we can take up this to TB decide
> > >>> one way or another to make forward progress. Let us know.
> > >>
> > >> Ferruh, Andrew, Ori, Ivan, what is your opinion?
> > >> Let's progress with this patch to make it in -rc1.
> >
> > As I understand all agreed that we need testpmd command to
> > control negotiated Rx metadata. May be even command-line
> > option would be useful.
> >
> > So, remaining question is what should be the default value in
> > testpmd. Note that it is just testpmd question since default
> > value in an abstract application is nothing negotiated
> > (if I'm not mistaken).
> >
> > The key advantaan ge of the current behaviour is to avoid
> > "double-enabling" in testpmd. It preserves behaviour which
> > we had before before the API addition. It is a strong
> > argument. Basically it puts the feature into the same
> > basket as FAST_FREE - need an action to run faster.
>
> I think, there is a disconnect here. FAST_FREE is enabled by default.
> i.e We don't need any specific action to run faster. To align with performance
> test application, by default the configuration should be run faster. User
> needs to give explicit configuration to allow more offload or the one causes
> the mpps drops. IMO, That is the theme followed in testpmd.
>
>
I agree with Andrew, the default should stay the same, as now, PMD may already implement
logic to only enable the feature if there is a flow rule.
Changing the default will result in breaking applications.
I want to suggest new approach for this feature,
maybe we can use the rte_flow_configure, and add a new bit that says if those
actions are going to be used.
What do you think?
> > I see no problem in such approach.
> >
> > The key disadvantage is the difference in testpmd and
> > other applications default behaviour.
> >
> > I'd look at the feature in the following way:
> > if an application theoretically wants to use
> > USER_FLAG, USER_MARK or TUNNEL_ID it must negotiate
> > corresponding Rx metadata to ensure that the feature is
> > available and HW is informed that application may need it.
> > Since testpmd supports corresponding flow API actions and
> > flow tunnels, it tries to negotiate it by default, but do
> > not fail if the negotiation fails.
> >
> > So, I'd would vote to keeping the default value as is.
> >
next prev parent reply other threads:[~2023-02-01 9:00 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-01 4:41 [PATCH] app/testpmd: add command line argument 'rx-metadata' Hanumanth Pothula
2022-08-01 13:11 ` Hanumanth Pothula
2022-08-01 13:13 ` Hanumanth Pothula
2022-08-01 19:41 ` Ivan Malov
2022-08-02 16:45 ` [PATCH] app/testpmd: add command line argument 'nic-to-pmd-rx-metadata' Hanumanth Pothula
2022-08-02 16:45 ` [PATCH v2 1/2] version: 22.11-rc0 Hanumanth Pothula
2022-08-02 16:45 ` [PATCH v2 2/2] app/testpmd: add command line argument 'nic-to-pmd-rx-metadata' Hanumanth Pothula
2022-08-02 17:51 ` [PATCH v2 1/1] " Hanumanth Pothula
2022-08-30 12:36 ` Hanumanth Reddy Pothula
2022-09-01 8:03 ` Singh, Aman Deep
2022-10-04 14:48 ` Andrew Rybchenko
2022-10-06 18:35 ` [PATCH v3 1/1] app/testpmd: control passing Rx metadata to PMD Hanumanth Pothula
2022-10-17 8:32 ` Andrew Rybchenko
2022-10-27 7:34 ` Thomas Monjalon
2022-10-27 12:54 ` Thomas Monjalon
2022-12-02 16:14 ` [EXT] " Hanumanth Reddy Pothula
2022-12-02 19:41 ` Thomas Monjalon
2022-12-05 7:59 ` Hanumanth Reddy Pothula
2022-12-05 8:28 ` Thomas Monjalon
2022-12-05 9:43 ` Slava Ovsiienko
2022-12-20 20:02 ` [PATCH v4 1/2] ethdev: control Rx metadata negotiation Hanumanth Pothula
2022-12-20 20:02 ` [PATCH v4 2/2] app/testpmd: add command to process " Hanumanth Pothula
2022-12-20 21:23 ` Stephen Hemminger
2022-12-21 2:07 ` [PATCH v5 1/2] ethdev: fix ethdev configuration state on reset Hanumanth Pothula
2022-12-21 2:07 ` [PATCH v5 2/2] app/testpmd: add command to process Rx metadata negotiation Hanumanth Pothula
2023-01-18 10:32 ` Thomas Monjalon
2023-01-19 10:33 ` [EXT] " Hanumanth Reddy Pothula
2023-01-25 12:51 ` Thomas Monjalon
2023-01-24 18:04 ` Ferruh Yigit
2023-01-25 9:30 ` [EXT] " Hanumanth Reddy Pothula
2023-01-25 12:55 ` Thomas Monjalon
2023-01-25 13:55 ` Ferruh Yigit
2023-01-25 13:59 ` Thomas Monjalon
2023-01-25 14:42 ` Nithin Kumar Dabilpuram
2023-01-26 11:03 ` Thomas Monjalon
2023-01-27 5:02 ` Nithin Kumar Dabilpuram
2023-01-27 8:54 ` Thomas Monjalon
2023-01-27 10:42 ` Nithin Kumar Dabilpuram
2023-01-27 15:01 ` Thomas Monjalon
2023-01-31 16:17 ` Jerin Jacob
2023-01-31 23:03 ` Thomas Monjalon
2023-02-01 6:10 ` Ivan Malov
2023-02-01 7:16 ` Andrew Rybchenko
2023-02-01 8:53 ` Jerin Jacob
2023-02-01 9:00 ` Ori Kam [this message]
2023-02-01 9:05 ` Thomas Monjalon
2023-02-01 9:07 ` Andrew Rybchenko
2023-02-01 9:14 ` Jerin Jacob
2023-02-01 9:29 ` Andrew Rybchenko
2023-02-01 10:48 ` Jerin Jacob
2023-02-01 10:58 ` Andrew Rybchenko
2023-02-01 11:04 ` Thomas Monjalon
2023-02-01 11:15 ` Jerin Jacob
2023-02-01 11:35 ` Ferruh Yigit
2023-02-01 13:48 ` Jerin Jacob
2023-02-01 14:50 ` Ferruh Yigit
2023-02-01 15:22 ` Jerin Jacob
2023-02-02 8:43 ` Ferruh Yigit
2023-02-02 8:50 ` Ivan Malov
2023-02-02 9:17 ` Ferruh Yigit
2023-02-02 10:41 ` Ivan Malov
2023-02-02 10:48 ` Ivan Malov
2023-02-02 11:41 ` Thomas Monjalon
2023-02-02 11:55 ` Ivan Malov
2023-02-02 12:03 ` Thomas Monjalon
2023-02-02 12:21 ` Andrew Rybchenko
2023-02-01 11:20 ` Ivan Malov
2023-01-25 13:17 ` Ferruh Yigit
2023-01-25 13:21 ` Ferruh Yigit
2023-01-25 13:21 ` Ferruh Yigit
2023-01-16 10:43 ` [PATCH v5 1/2] ethdev: fix ethdev configuration state on reset Hanumanth Reddy Pothula
2023-01-18 10:29 ` Thomas Monjalon
2023-01-24 18:14 ` Ferruh Yigit
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