From: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
To: Thomas Monjalon <thomas@monjalon.net>,
Jerin Jacob <jerinjacobk@gmail.com>, Ori Kam <orika@nvidia.com>
Cc: Ivan Malov <ivan.malov@arknetworks.am>,
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 12:07:57 +0300 [thread overview]
Message-ID: <0e383338-0bd8-8f1c-00f1-50605030d84f@oktetlabs.ru> (raw)
In-Reply-To: <3180381.AJdgDx1Vlc@thomas>
On 2/1/23 12:05, Thomas Monjalon wrote:
> 01/02/2023 10:00, Ori Kam:
>> 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.
Sorry, I'm lost here. Don't we need to enable FAST_FREE
offload? As far as I know all offloads are disabled 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.
>
> That's not what is discussed here.
> We are talking only about testpmd default.
>
>> 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?
>
> Let's not change the API please.
>
>
>>>> 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 9:08 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
2023-02-01 9:05 ` Thomas Monjalon
2023-02-01 9:07 ` Andrew Rybchenko [this message]
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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