From: Stephen Hemminger <stephen@networkplumber.org>
To: Gaetan Rivet <grive@u256.net>
Cc: dev@dpdk.org, Vamsi Attunuru <vattunuru@marvell.com>,
Jerin Jacob <jerinj@marvell.com>
Subject: Re: [dpdk-dev] [PATCH v7] eal: add manual probing option
Date: Wed, 14 Jun 2023 12:33:22 -0700 [thread overview]
Message-ID: <20230614120428.34dc0320@hermes.local> (raw)
In-Reply-To: <3825f1afeebd62b3e50535574ddedadb31435616.1579772895.git.grive@u256.net>
On Thu, 23 Jan 2020 10:58:13 +0100
Gaetan Rivet <grive@u256.net> wrote:
> Add a new EAL option enabling manual probing in the EAL.
> This command line option will configure the EAL so that buses
> will not trigger their probe step on their own.
>
> Applications are then expected to hotplug devices as they see fit.
>
> Devices declared on the command line by the user (using -w and --vdev),
> will be probed using the hotplug API, in the order they are declared.
>
> This has the effect of offering a way for users to control probe order
> of their devices, for drivers requiring it.
>
> Signed-off-by: Gaetan Rivet <grive@u256.net>
> Acked-by : Vamsi Attunuru <vattunuru@marvell.com>
> Tested-by: Vamsi Attunuru <vattunuru@marvell.com>
> Reviewed-by: Jerin Jacob <jerinj@marvell.com>
> ---
>
> haven't heard many opinions on the matter, please shout if you see an issue
> with this approach.
>
> @Slava: I have tested rather quickly that it does not break anything,
> and that it works as intended for basic cases.
> Can you test it further for your use-case and tell me if it works fine?
>
> Beyond the obvious difference between both probe mode, something to keep in mind:
> while using -w on invalid devices would not block (PCI) bus probing, it will stop manual
> probing in its track. All devices need to exist and be valid device IDs.
>
> v2: fixed a few typos, map file (and used Travis to validate).
>
> Slava, are you able to test this patch?
>
> v3: properly fixed the map file (inherited 19.08 instead of 19.05).
>
> Added a function to set the probe manual from the application,
> without having the user do it from the command line.
>
> Stopped spamming Slava about it, Vamsi was actually the one interested in it!
>
> Standing issue worth chiming in:
>
> Currently manual-probe will cut off probing from all buses.
> It could be interesting to be able to only cut buses supporting hotplug,
> given that they are the one able to probe devices afterward.
>
> No real use-case for this right now, so leaving as-is. Might be worth
> considering in the future.
>
> v4: Rebased on master,
> Moved implementation in common EAL,
> Used public API within the EAL to set the option,
> Made the API experimental
>
> v5: added note in the Getting Started Guide.
>
> v6: Rebased on master
>
> see http://mails.dpdk.org/archives/dev/2020-January/154178.html
> for reference to this version, linking v7 to v5 thread.
>
> v7: Updated author and SoB.
>
> doc/guides/linux_gsg/eal_args.include.rst | 13 ++++++
> doc/guides/rel_notes/release_20_02.rst | 9 ++++
> lib/librte_eal/common/eal_common_bus.c | 6 +++
> lib/librte_eal/common/eal_common_dev.c | 54 ++++++++++++++++++++++
> lib/librte_eal/common/eal_common_options.c | 8 ++++
> lib/librte_eal/common/eal_internal_cfg.h | 1 +
> lib/librte_eal/common/eal_options.h | 2 +
> lib/librte_eal/common/eal_private.h | 9 ++++
> lib/librte_eal/common/include/rte_eal.h | 36 +++++++++++++++
> lib/librte_eal/rte_eal_version.map | 4 ++
> 10 files changed, 142 insertions(+)
This patch seems to have been held in limbo for 3 years.
For me, it is ok, but concerned that it opens up a whole scenario of possible
usages that may not be tested, and probably don't work. Testing all the possible
combinations of probe ordering is a geometric problem.
So if user submits bug then the response would have to be:
Manual probing is an experimental option which may not work.
next prev parent reply other threads:[~2023-06-14 19:33 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
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 ` Stephen Hemminger [this message]
2023-06-26 16:12 ` [dpdk-dev] " Gaëtan Rivet
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