From: Jan Blunck <jblunck@infradead.org>
To: "Gaëtan Rivet" <gaetan.rivet@6wind.com>
Cc: dev <dev@dpdk.org>,
Stephen Hemminger <stephen@networkplumber.org>,
Maxime Coquelin <maxime.coquelin@redhat.com>,
Jerin Jacob <jerin.jacob@caviumnetworks.com>,
David Marchand <david.marchand@6wind.com>
Subject: Re: [dpdk-dev] [PATCH 0/9] rte_bus parse API
Date: Thu, 8 Jun 2017 13:38:12 +0200 [thread overview]
Message-ID: <CALe+Z03sCkLdEMFUfkBJEoRK+3rkWegWXMcCQG3nag=4AFt92A@mail.gmail.com> (raw)
In-Reply-To: <20170607195531.GT18840@bidouze.vm.6wind.com>
On Wed, Jun 7, 2017 at 9:55 PM, Gaëtan Rivet <gaetan.rivet@6wind.com> wrote:
> On Wed, Jun 07, 2017 at 07:22:05PM +0200, Jan Blunck wrote:
>> On Wed, May 24, 2017 at 5:12 PM, Gaetan Rivet <gaetan.rivet@6wind.com> wrote:
>> > Following the evolutions announced in [1], here is the first part of
>> > the rte_devargs rework planned for 17.08. The rationale has been partially
>> > explained in [2].
>> >
>> > This first part covers the introduction of the necessary facilities in
>> > rte_bus to allow for generic device parsing. This API is implemented for
>> > the virtual and PCI buses. Additionally, this rte_bus evolution is being
>> > used within rte_devargs to characterize a device type by its bus.
>> > This work is the first of two parts to reduce the dependency of the EAL
>> > upon specific bus implementations.
>> >
>> > Two public functions are added to rte_bus to help bus recognition:
>> >
>> > - rte_bus_from_name
>> > - rte_bus_from_dev
>> >
>> > These functions are made public because the bus handle within devargs
>> > becomes the generic device type. Recognizing device types is useful for
>> > buses and PMDs alike.
>> > The modified rte_devargs parsing allows declaring on the EAL command line
>> > explicit buses to handle a device. The format is as follow:
>> >
>> > --vdev="virtual:net_ring0" --vdev="net_tap0,iface=tap0"
>> > -w PCI:00:02.0 -w 00:03.0
>> >
>>
>> I don't see the point of doing this. The --vdev parameter implicitly
>> defines the bus by its name (--vdev aka virtual device).
>>
>> Why don't you add a commandline "--dev" parameter that supports a
>> "bus=" devarg? You would need to clarify what that means for other
>> busses than the virtual one. Is the bus switched into whitelist mode
>> by that?
>>
>>
>
> We cannot keep the current -w, -b and --vdev parameter. Those are
> processed by the EAL, and use specifics from the virtual and PCI buses.
>
> The rte_devargs rework has been to make the same functionality generic
> to all rte_bus. As seen quickly in [2], rte_devargs has two functions:
>
> * Validating a device declaration
> * Keeping the relevant device info until it has been processed.
>
I don't agree with the validation step. This is highly
device/driver/bus specific and I don't believe that just because you
have created a rte_devargs it is a guarantee that the device is valid.
Besides that it makes statically embedding rte_devargs into other
structures impossible. As I see it rte_devargs is a key-value list
with some keys that are generic. This would make application
development much easier.
> Both functionalities have been genericized. This results in all parameters
> being able to be used with all types of devices. This is inherent to the
> EAL becoming bus-agnostic.
>
> Now, it is absolutely possible to rename for example -w as --dev, as it
> is the expected behavior from users. This however should be discussed by
> the community, last time I talked about the possibility of switching the
> default of the PCI bus to whitelist mode the community wasn't all that
> enthused by the prospect.
>
> Finally, I do not like the idea of a special devarg just for declaring
> explicitly buses for devices. The bus is not a device modifier, nor is
> it a driver parameter. The bus is a way to define the location of the
> device on the system. Adding a special "bus=" devargs means having some
> preprocessing done on devargs upon rte_devargs allocation. This was
> already abused by the bonding PMD with the driver= parameter. I do not
> support this and did not want to repeat it. Passing down the device args
> is a simple process and we should keep it as simple as possible.
>
> I know you do not like having the bus as part of the device name.
> As a compromise, I made the current system flexible and allowed the legacy
> device definition to be kept.
>
> However with a purely generic process, it is necessary to at least offer
> the possibility to the user to explicitly use a bus, as nothing prevents
> conflicting device names from existing.
>
>> > [2]: http://dpdk.org/ml/archives/dev/2017-May/065670.html
>
>> > This explicit bus designation is optional; no evolution is currently
>> > forced on users to migrate to this new format. The separating character is
>> > arbitrary and can be any character illegal within a bus name.
>> > Subsequently, what is allowed within a bus name has been formally
>> > defined and is now enforced.
>> >
>> > [1]: http://dpdk.org/ml/archives/dev/2017-May/065634.html
>> > [2]: http://dpdk.org/ml/archives/dev/2017-May/065670.html
>> >
>> > This patchset depends on:
>> >
>> > bus: attach / detach API
>> > http://dpdk.org/ml/archives/dev/2017-May/066330.html
>> > http://dpdk.org/dev/patchwork/patch/24489/
>> >
>> > Gaetan Rivet (9):
>> > bus: fix bus name registration
>> > bus: verify bus name on registration
>> > bus: introduce parsing functionality
>> > vdev: implement parse bus operation
>> > pci: implement parse bus operation
>> > bus: add helper to find bus from a name
>> > bus: add helper to find a bus from a device name
>> > vdev: expose bus name
>> > devargs: parse bus info
>> >
>> > lib/librte_eal/bsdapp/eal/rte_eal_version.map | 8 +++
>> > lib/librte_eal/common/eal_common_bus.c | 47 +++++++++++++++++
>> > lib/librte_eal/common/eal_common_devargs.c | 17 +++++-
>> > lib/librte_eal/common/eal_common_pci.c | 19 +++++++
>> > lib/librte_eal/common/eal_common_vdev.c | 70 ++++++++++++++-----------
>> > lib/librte_eal/common/eal_private.h | 16 ++++++
>> > lib/librte_eal/common/include/rte_bus.h | 49 ++++++++++++++++-
>> > lib/librte_eal/common/include/rte_devargs.h | 3 ++
>> > lib/librte_eal/common/include/rte_vdev.h | 2 +
>> > lib/librte_eal/linuxapp/eal/rte_eal_version.map | 8 +++
>> > 10 files changed, 205 insertions(+), 34 deletions(-)
>> >
>> > --
>> > 2.1.4
>> >
>
> --
> Gaėtan Rivet
> 6WIND
next prev parent reply other threads:[~2017-06-08 11:38 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-24 15:12 Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 1/9] bus: fix bus name registration Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 2/9] bus: verify bus name on registration Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 3/9] bus: introduce parsing functionality Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 4/9] vdev: implement parse bus operation Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 5/9] pci: " Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 6/9] bus: add helper to find bus from a name Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 7/9] bus: add helper to find a bus from a device name Gaetan Rivet
2017-06-07 17:28 ` Jan Blunck
2017-06-07 20:03 ` Gaëtan Rivet
2017-06-08 10:45 ` Jan Blunck
2017-06-08 11:36 ` Gaëtan Rivet
2017-06-08 11:40 ` Jan Blunck
2017-06-08 12:51 ` Gaëtan Rivet
2017-06-10 8:50 ` Jan Blunck
2017-06-12 14:21 ` Gaëtan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 8/9] vdev: expose bus name Gaetan Rivet
2017-05-24 15:12 ` [dpdk-dev] [PATCH 9/9] devargs: parse bus info Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 0/9] rte_bus parse API Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 1/9] bus: fix bus name registration Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 2/9] bus: verify bus name on registration Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 3/9] bus: introduce parsing functionality Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 4/9] vdev: implement parse bus operation Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 5/9] pci: " Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 6/9] bus: add helper to find bus from a name Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 7/9] bus: add helper to find a bus from a device name Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 8/9] vdev: expose bus name Gaetan Rivet
2017-05-24 16:15 ` [dpdk-dev] [PATCH v2 9/9] devargs: parse bus info Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 0/9] rte_bus parse API Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 1/9] bus: fix bus name registration Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 2/9] bus: verify bus name on registration Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 3/9] bus: introduce parsing functionality Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 4/9] vdev: implement parse bus operation Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 5/9] pci: " Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 6/9] bus: add helper to find bus from a name Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 7/9] bus: add helper to find a bus from a device name Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 8/9] vdev: expose bus name Gaetan Rivet
2017-06-01 10:08 ` [dpdk-dev] [PATCH v3 9/9] devargs: parse bus info Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 0/9] rte_bus parse API Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 1/9] bus: fix bus name registration Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 2/9] bus: verify bus name on registration Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 3/9] bus: introduce parsing functionality Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 4/9] vdev: implement parse bus operation Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 5/9] pci: " Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 6/9] bus: add helper to find a bus from a bus name Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 7/9] bus: add helper to find a bus from a device name Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 8/9] vdev: expose bus name Gaetan Rivet
2017-06-07 23:56 ` [dpdk-dev] [PATCH v4 9/9] devargs: parse bus info Gaetan Rivet
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 0/7] rte_bus parse API Gaetan Rivet
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 1/7] bus: fix bus name registration Gaetan Rivet
2017-06-27 15:53 ` Bruce Richardson
2017-06-27 19:19 ` Jan Blunck
2017-07-04 1:05 ` Gaëtan Rivet
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 2/7] bus: introduce parsing functionality Gaetan Rivet
2017-06-27 15:54 ` Bruce Richardson
2017-06-27 19:26 ` Jan Blunck
2017-07-04 1:35 ` Gaëtan Rivet
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 3/7] vdev: implement parse bus operation Gaetan Rivet
2017-06-27 15:59 ` Bruce Richardson
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 4/7] pci: " Gaetan Rivet
2017-06-27 16:18 ` Bruce Richardson
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 5/7] bus: add helper to find a bus from a device name Gaetan Rivet
2017-06-27 16:26 ` Bruce Richardson
2017-06-27 18:55 ` Jan Blunck
2017-06-28 17:03 ` Thomas Monjalon
2017-06-29 7:56 ` Jan Blunck
2017-06-29 8:21 ` Thomas Monjalon
2017-06-29 10:23 ` Gaëtan Rivet
2017-06-29 10:30 ` Richardson, Bruce
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 6/7] vdev: expose bus name Gaetan Rivet
2017-06-20 23:30 ` [dpdk-dev] [PATCH v5 7/7] devargs: parse bus info Gaetan Rivet
2017-06-27 16:01 ` [dpdk-dev] [PATCH v5 0/7] rte_bus parse API Bruce Richardson
2017-07-04 0:58 ` [dpdk-dev] [PATCH v6 0/6] " Gaetan Rivet
2017-07-04 0:58 ` [dpdk-dev] [PATCH v6 1/6] bus: fix bus name registration Gaetan Rivet
2017-07-04 21:43 ` [dpdk-dev] [PATCH] bus: fix driver registration Thomas Monjalon
2017-07-05 5:47 ` Shreyansh Jain
2017-07-05 6:01 ` Shreyansh Jain
2017-07-04 0:58 ` [dpdk-dev] [PATCH v6 2/6] bus: introduce parsing functionality Gaetan Rivet
2017-07-04 0:58 ` [dpdk-dev] [PATCH v6 3/6] vdev: implement parse bus operation Gaetan Rivet
2017-07-04 0:58 ` [dpdk-dev] [PATCH v6 4/6] pci: " Gaetan Rivet
2017-07-04 0:58 ` [dpdk-dev] [PATCH v6 5/6] bus: add helper to find a bus from a device name Gaetan Rivet
2017-07-04 12:28 ` Gaëtan Rivet
2017-07-04 0:58 ` [dpdk-dev] [PATCH v6 6/6] devargs: parse bus info Gaetan Rivet
2017-07-04 23:55 ` [dpdk-dev] [PATCH v7 0/6] rte_bus parse API Gaetan Rivet
2017-07-04 23:55 ` [dpdk-dev] [PATCH v7 1/6] bus: fix driver registration Gaetan Rivet
2017-07-05 13:03 ` Shreyansh Jain
2017-07-06 6:05 ` santosh
2017-07-04 23:55 ` [dpdk-dev] [PATCH v7 2/6] bus: introduce parsing functionality Gaetan Rivet
2017-07-05 13:04 ` Shreyansh Jain
2017-07-06 9:19 ` santosh
2017-07-06 12:30 ` Gaëtan Rivet
2017-07-06 13:12 ` santosh
2017-07-06 13:30 ` Gaëtan Rivet
2017-07-04 23:55 ` [dpdk-dev] [PATCH v7 3/6] vdev: implement parse bus operation Gaetan Rivet
2017-07-05 13:16 ` Shreyansh Jain
2017-07-06 9:35 ` santosh
2017-07-04 23:55 ` [dpdk-dev] [PATCH v7 4/6] pci: " Gaetan Rivet
2017-07-04 23:55 ` [dpdk-dev] [PATCH v7 5/6] bus: add helper to find a bus from a device name Gaetan Rivet
2017-07-05 13:35 ` Shreyansh Jain
2017-07-05 13:45 ` Gaëtan Rivet
2017-07-05 14:12 ` Shreyansh Jain
2017-07-06 10:10 ` Thomas Monjalon
2017-07-06 11:37 ` Gaëtan Rivet
2017-07-04 23:55 ` [dpdk-dev] [PATCH v7 6/6] devargs: parse bus info Gaetan Rivet
2017-07-05 18:03 ` Stephen Hemminger
2017-07-06 9:07 ` Shreyansh Jain
2017-07-06 10:00 ` Gaëtan Rivet
2017-07-06 13:17 ` Shreyansh Jain
2017-07-07 0:03 ` [dpdk-dev] [PATCH v8 0/6] rte_bus parse API Gaetan Rivet
2017-07-07 0:03 ` [dpdk-dev] [PATCH v8 1/6] bus: fix driver registration Gaetan Rivet
2017-07-07 0:03 ` [dpdk-dev] [PATCH v8 2/6] bus: introduce parsing functionality Gaetan Rivet
2017-07-07 0:03 ` [dpdk-dev] [PATCH v8 3/6] vdev: implement parse bus operation Gaetan Rivet
2017-07-07 0:03 ` [dpdk-dev] [PATCH v8 4/6] pci: " Gaetan Rivet
2017-07-07 0:03 ` [dpdk-dev] [PATCH v8 5/6] bus: add helper to find a bus from a device name Gaetan Rivet
2017-07-07 0:03 ` [dpdk-dev] [PATCH v8 6/6] devargs: parse bus info Gaetan Rivet
2017-07-07 0:45 ` Stephen Hemminger
2017-07-07 8:31 ` Gaëtan Rivet
2017-07-08 20:31 ` Thomas Monjalon
2017-07-08 20:30 ` [dpdk-dev] [PATCH v8 0/6] rte_bus parse API Thomas Monjalon
2017-06-07 17:22 ` [dpdk-dev] [PATCH 0/9] " Jan Blunck
2017-06-07 19:55 ` Gaëtan Rivet
2017-06-08 11:38 ` Jan Blunck [this message]
2017-06-08 13:04 ` Gaëtan Rivet
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