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From: Thomas Monjalon <thomas@monjalon.net>
To: Pavan Nikhilesh Bhagavatula <pbhagavatula@marvell.com>,
	Gaetan Rivet <grive@u256.net>,
	Vamsi Krishna Attunuru <vattunuru@marvell.com>
Cc: David Marchand <david.marchand@redhat.com>,
	dev@dpdk.org, Jerin Jacob Kollanukkaran <jerinj@marvell.com>
Subject: Re: [dpdk-dev] [PATCH v7] eal: add manual probing option
Date: Tue, 04 Feb 2020 16:06:03 +0100	[thread overview]
Message-ID: <4205291.LvFx2qVVIh@xps> (raw)
In-Reply-To: <a2ac8568-1654-1b54-39b1-2a8533991a0b@u256.net>

04/02/2020 13:43, Gaetan Rivet:
> On 04/02/2020 12:07, Thomas Monjalon wrote:
> > 04/02/2020 11:03, Gaetan Rivet:
> >> On 03/02/2020 23:21, Thomas Monjalon wrote:
> >>> 03/02/2020 06:16, Pavan Nikhilesh Bhagavatula:
> >>>> @David Marchand @thomas@monjalon.net
> >>>>
> >>>> Ping?
> >>>>
> >>>> Are there any more changes required for this patch? It's been in queue since last October.
> >>>
> >>> Sorry we have not decided whether it is a good idea or not.
> >>>
> >>> All changes related to probing are very sensitive,
> >>> and we know a big refactoring would be better than stacking
> >>> more and more options and corner cases.
> >>>
> >>> As we are busy with ABI stability stuff, we did not allocate
> >>> enough time to properly think about this feature.
> >>> Please accept our apologies, and let's consider it as
> >>> a high priority for 20.05 cycle.
> >>>
> >>
> >> Hello Thomas,
> >>
> >> This is unfortunate. I pushed Pavan to accept an alternative implementation of this functionality that was less obtrusive, to make the integration smoother. I took care to alleviate those risks from the common path.
> >>
> >> The big refactoring is needed yes, but considering the current path I'm not seeing it happen in 20.05. If that means taking this patch as-is in 20.05 for Marvell users, I'm not sure much is gained from waiting 3 months, except minimal risk avoidance.
> > 
> > 
> > Yes, life is full of bad decisions and consequences.
> 
> 
> Ah, yes, but I stand by my initial opinion, the first implementation [1] was riskier and less useful.
> 
> > 
> > I still think there is a risk in adding new user expectations,
> > and maintaining some code to workaround unknown issues.
> > 
> > The real question here is to know why this patch?
> > Is it to workaround a broken driver?
> > Or to workaround a broken design in EAL and bus drivers?
> 
> Two birds - one stone here: OVS needed a way to disable automatic probing cleanly (current workaround seen in multiple deployment is to add a dummy whitelisted device, which will be ignored by the PCI bus --> it sets the bus in whitelist mode but avoid probing anything), and as a bonus this option allows using devices that depends on other devices being probed already (LAG, representors, failsafe, etc).
> 
> I'm not sure having a dependent-probe by default is good, and that would be a big change.
> 
> If we are doing the genesis of this patch, the initial motivation should be asked for more details from Marvell people and David for the OVS side.
> 
> [1]: First proposal:
>         http://mails.dpdk.org/archives/dev/2019-September/144166.html
>       My arguments:
>         http://mails.dpdk.org/archives/dev/2019-September/144564.html


OK so there are two needs:

1/ Better control whitelist/blacklist mode.
We already know that a rework is needed here.
Unfortunately neither you or me had time to work on it,
and others who were interested disappeared.

2/ Associate ports with equivalent properties in applications.
This must be done in applications.
Tweaking the probe order is a hack.



  reply	other threads:[~2020-02-04 15:06 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-23 11:56 [dpdk-dev] [PATCH v1 1/1] bus/pci: probe PCI devices in whitelisted order vattunuru
2019-09-25  6:41 ` Slava Ovsiienko
2019-09-25  9:07   ` Gaëtan Rivet
2019-09-26  4:15     ` Vamsi Krishna Attunuru
2019-09-26  8:04       ` Gaëtan Rivet
2019-09-26  9:39         ` [dpdk-dev] [EXT] " Vamsi Krishna Attunuru
2019-09-30 12:51           ` [dpdk-dev] [PATCH v1] eal: add manual probing option Gaetan Rivet
2019-09-30 17:51             ` Aaron Conole
2019-10-01  7:28               ` Gaëtan Rivet
2019-10-01 12:57                 ` Aaron Conole
2019-09-30 18:53             ` Stephen Hemminger
2019-10-01  9:10               ` Gaëtan Rivet
2019-10-01  9:49                 ` Jerin Jacob
2019-10-01 14:09                   ` Gaëtan Rivet
2019-10-01 14:26                     ` Jerin Jacob
2019-10-03  7:58             ` [dpdk-dev] [PATCH v2] " Gaetan Rivet
2019-10-04 12:55               ` [dpdk-dev] [PATCH v3] " Gaetan Rivet
2019-10-07  1:27                 ` Vamsi Krishna Attunuru
2019-10-23  8:44                   ` Gaëtan Rivet
2019-10-25 11:59                 ` Jerin Jacob
2019-10-25 12:50                   ` Gaëtan Rivet
2019-10-25 13:24                     ` Jerin Jacob
2019-10-25 14:41                 ` [dpdk-dev] [PATCH v4] " Gaetan Rivet
2019-10-25 15:01                   ` Jerin Jacob
2019-10-25 15:46                   ` [dpdk-dev] [PATCH v5] " Gaetan Rivet
2019-10-25 15:51                     ` Jerin Jacob
2020-01-22 16:51                     ` Pavan Nikhilesh Bhagavatula
2020-01-23  9:20                       ` Gaetan Rivet
2020-01-23  9:58                     ` [dpdk-dev] [PATCH v7] " Gaetan Rivet
2020-02-03  5:16                       ` Pavan Nikhilesh Bhagavatula
2020-02-03 22:21                         ` Thomas Monjalon
2020-02-04 10:03                           ` Gaetan Rivet
2020-02-04 11:07                             ` Thomas Monjalon
2020-02-04 12:43                               ` Gaetan Rivet
2020-02-04 15:06                                 ` Thomas Monjalon [this message]
2020-02-04 16:02                                   ` Gaetan Rivet
2020-02-10 14:51                                     ` Jerin Jacob
2020-02-10 15:27                                       ` Thomas Monjalon
2020-02-10 16:33                                         ` Jerin Jacob
2020-04-03  3:30                                           ` [dpdk-dev] [PATCH] [v1 1/1] examples/l2fwd: add cmdline option for forwarding port info vattunuru
2020-04-03 12:51                                             ` Andrzej Ostruszka [C]
2020-04-05  3:49                                               ` Vamsi Krishna Attunuru
2020-04-05  3:52                                             ` [dpdk-dev] [PATCH] [v2 " vattunuru
2020-04-06  9:32                                               ` Andrzej Ostruszka [C]
2020-04-26 21:19                                               ` Thomas Monjalon
2020-04-27  7:59                                               ` [dpdk-dev] [PATCH v3] " pbhagavatula
2020-04-27  9:19                                                 ` Sunil Kumar Kori
2020-04-27  9:36                                                   ` Andrzej Ostruszka [C]
2020-04-27 10:14                                                     ` Sunil Kumar Kori
2020-04-27 16:38                                                   ` Pavan Nikhilesh Bhagavatula
2020-04-27 16:49                                                     ` Sunil Kumar Kori
2020-04-27 18:31                                                 ` [dpdk-dev] [PATCH v4] " pbhagavatula
2020-04-28  5:54                                                   ` Sunil Kumar Kori
2020-05-01 14:00                                                   ` Varghese, Vipin
2020-05-01 15:14                                                     ` Pavan Nikhilesh Bhagavatula
2020-05-02  4:34                                                       ` Varghese, Vipin
2020-05-11  0:23                                                         ` Pavan Nikhilesh Bhagavatula
2020-05-24 16:13                                                           ` Thomas Monjalon
2020-05-25  9:29                                                             ` Bruce Richardson
2020-07-04 13:36                                                               ` Jerin Jacob
2020-07-05 12:23                                                                 ` Thomas Monjalon
2020-04-04 16:34                                           ` [dpdk-dev] [EXT] Re: [PATCH v7] eal: add manual probing option Jerin Jacob Kollanukkaran
2023-06-14 19:33                       ` [dpdk-dev] " Stephen Hemminger
2023-06-26 16:12                         ` Gaëtan Rivet

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