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From: Thomas Monjalon <thomas@monjalon.net>
To: Jerin Jacob <jerinjacobk@gmail.com>
Cc: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	"Yigit, Ferruh" <ferruh.yigit@intel.com>, dpdk-dev <dev@dpdk.org>,
	Elena Agostini <eagostini@nvidia.com>,
	David Marchand <david.marchand@redhat.com>, nd <nd@arm.com>,
	"Wang, Haiyue" <haiyue.wang@intel.com>
Subject: Re: [dpdk-dev] [PATCH] gpudev: introduce memory API
Date: Tue, 08 Jun 2021 09:32:43 +0200	[thread overview]
Message-ID: <9721638.xpiActGcI8@thomas> (raw)
In-Reply-To: <CALBAE1ORmNPD_DW6wb4BUUAXr8pL+-0w+5AkhS16TMn2aff4qw@mail.gmail.com>

08/06/2021 09:09, Jerin Jacob:
> On Tue, Jun 8, 2021 at 12:05 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> >
> > 08/06/2021 06:10, Jerin Jacob:
> > > On Mon, Jun 7, 2021 at 10:17 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> > > >
> > > > 07/06/2021 15:54, Jerin Jacob:
> > > > > On Mon, Jun 7, 2021 at 4:13 PM Thomas Monjalon <thomas@monjalon.net> wrote:
> > > > > > 07/06/2021 09:20, Wang, Haiyue:
> > > > > > > From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
> > > > > > > > If we keep CXL in mind, I would imagine that in the future the devices on PCIe could have their own
> > > > > > > > local memory. May be some of the APIs could use generic names. For ex: instead of calling it as
> > > > > > > > "rte_gpu_malloc" may be we could call it as "rte_dev_malloc". This way any future device which hosts
> > > > > > > > its own memory that need to be managed by the application, can use these APIs.
> > > > > > > >
> > > > > > >
> > > > > > > "rte_dev_malloc" sounds a good name,
> > > > > >
> > > > > > Yes I like the idea.
> > > > > > 2 concerns:
> > > > > >
> > > > > > 1/ Device memory allocation requires a device handle.
> > > > > > So far we avoided exposing rte_device to the application.
> > > > > > How should we get a device handle from a DPDK application?
> > > > >
> > > > > Each device behaves differently at this level. In the view of the
> > > > > generic application, the architecture should like
> > > > >
> > > > > < Use DPDK subsystem as rte_ethdev, rte_bbdev etc for SPECIFIC function >
> > > > > ^
> > > > > |
> > > > > < DPDK driver>
> > > > > ^
> > > > > |
> > > > > <rte_device with this new callbacks >
> > > >
> > > > I think the formatting went wrong above.
> > > >
> > > > I would add more to the block diagram:
> > > >
> > > > class device API      - computing device API
> > > >         |            |              |
> > > > class device driver -   computing device driver
> > > >         |                           |
> > > >        EAL device with memory callback
> > > >
> > > > The idea above is that the class device driver can use services
> > > > of the new computing device library.
> > >
> > > Yes. The question is, do we need any public DPDK _application_ APIs for that?
> >
> > To have something generic!
> >
> > > If it is public API then the scope is much bigger than that as the application
> > > can use it directly and it makes it non portable.
> >
> > It is a non-sense. If we make an API, it will be better portable.
> 
> The portal application will be using class device API.
> For example, when application needs to call rte_gpu_malloc() vs rte_malloc() ?
> Is it better the use of drivers specific functions used in "class
> device driver" not exposed?
> 
> 
> 
> > The only part which is non-portable is the program on the device
> > which may be different per computing device.
> > The synchronization with the DPDK application should be portable
> > if we define some good API.
> >
> > > if the scope is only, the class driver consumption then the existing
> > > "bus"  _kind of_
> > > abstraction/API makes sense to me.
> > >
> > > Where it abstracts,
> > > -FW download of device
> > > -Memory management of device
> > > -Opaque way to enq/deque jobs to the device.
> > >
> > > And above should be consumed by "class driver" not "application".
> > >
> > > If the application doing do that, we are in rte_raw device territory.
> >
> > I'm sorry I don't understand what you make such assertion.
> > It seems you don't want generic API (which is the purpose of DPDK).
> 
> I would like to have a generic _application_ API if the application
> _needs_ to use it.
> 
> The v1 nowhere close to any compute device description.

As I said, I forgot the RFC tag.
I just wanted to start the discussion and it was fruitful, no regret.

> It has a memory allocation API. It is the device attribute, not
> strictly tied to ONLY TO computing device.
> 
> So at least, I am asking to have concrete
> proposal on "compute device" schematic rather than start with memory API
> and rubber stamp as new device adds anything in future.
> 
> When we added any all the class devices to DPDK, Everyone had a complete view
> of it is function(at RFC of each subsystem had enough API to express
> the "basic" usage)
> and purpose from the _application_ PoV. I see that is missing here.

I keep explaining in emails while preparing a v2.
Now that we go into circles, let's wait the v2 which will address
a lot of comments.



  reply	other threads:[~2021-06-08  7:32 UTC|newest]

Thread overview: 128+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02 20:35 Thomas Monjalon
2021-06-02 20:46 ` Stephen Hemminger
2021-06-02 20:48   ` Thomas Monjalon
2021-06-03  7:06 ` Andrew Rybchenko
2021-06-03  7:26   ` Thomas Monjalon
2021-06-03  7:49     ` Andrew Rybchenko
2021-06-03  8:26       ` Thomas Monjalon
2021-06-03  8:57         ` Andrew Rybchenko
2021-06-03  7:18 ` David Marchand
2021-06-03  7:30   ` Thomas Monjalon
2021-06-03  7:47 ` Jerin Jacob
2021-06-03  8:28   ` Thomas Monjalon
2021-06-03  8:41     ` Jerin Jacob
2021-06-03  8:43       ` Thomas Monjalon
2021-06-03  8:47         ` Jerin Jacob
2021-06-03  8:53           ` Thomas Monjalon
2021-06-03  9:20             ` Jerin Jacob
2021-06-03  9:36               ` Thomas Monjalon
2021-06-03 10:04                 ` Jerin Jacob
2021-06-03 10:30                   ` Thomas Monjalon
2021-06-03 11:38                     ` Jerin Jacob
2021-06-04 12:55                       ` Thomas Monjalon
2021-06-04 15:05                         ` Jerin Jacob
2021-06-03  9:33   ` Ferruh Yigit
2021-06-04 10:28     ` Thomas Monjalon
2021-06-04 11:09       ` Jerin Jacob
2021-06-04 12:46         ` Thomas Monjalon
2021-06-04 13:05           ` Andrew Rybchenko
2021-06-04 13:18             ` Thomas Monjalon
2021-06-04 13:59               ` Andrew Rybchenko
2021-06-04 14:09                 ` Thomas Monjalon
2021-06-04 15:20                   ` Jerin Jacob
2021-06-04 15:51                     ` Thomas Monjalon
2021-06-04 18:20                       ` Wang, Haiyue
2021-06-05  5:09                         ` Jerin Jacob
2021-06-06  1:13                           ` Honnappa Nagarahalli
2021-06-06  5:28                             ` Jerin Jacob
2021-06-07 10:29                               ` Thomas Monjalon
2021-06-07  7:20                             ` Wang, Haiyue
2021-06-07 10:43                               ` Thomas Monjalon
2021-06-07 13:54                                 ` Jerin Jacob
2021-06-07 16:47                                   ` Thomas Monjalon
2021-06-08  4:10                                     ` Jerin Jacob
2021-06-08  6:34                                       ` Thomas Monjalon
2021-06-08  7:09                                         ` Jerin Jacob
2021-06-08  7:32                                           ` Thomas Monjalon [this message]
2021-06-15 18:24                                         ` Ferruh Yigit
2021-06-15 18:54                                           ` Thomas Monjalon
2021-06-07 23:31                                   ` Honnappa Nagarahalli
2021-06-04  5:51 ` Wang, Haiyue
2021-06-04  8:15   ` Thomas Monjalon
2021-06-04 11:07 ` Wang, Haiyue
2021-06-04 12:43   ` Thomas Monjalon
2021-06-04 13:25     ` Wang, Haiyue
2021-06-04 14:06       ` Thomas Monjalon
2021-06-04 18:04         ` Wang, Haiyue
2021-06-05  7:49           ` Thomas Monjalon
2021-06-05 11:09             ` Wang, Haiyue
2021-06-06  1:10 ` Honnappa Nagarahalli
2021-06-07 10:50   ` Thomas Monjalon
2021-07-30 13:55 ` [dpdk-dev] [RFC PATCH v2 0/7] heterogeneous computing library Thomas Monjalon
2021-07-30 13:55   ` [dpdk-dev] [RFC PATCH v2 1/7] hcdev: introduce heterogeneous computing device library Thomas Monjalon
2021-07-30 13:55   ` [dpdk-dev] [RFC PATCH v2 2/7] hcdev: add event notification Thomas Monjalon
2021-07-30 13:55   ` [dpdk-dev] [RFC PATCH v2 3/7] hcdev: add child device representing a device context Thomas Monjalon
2021-07-30 13:55   ` [dpdk-dev] [RFC PATCH v2 4/7] hcdev: support multi-process Thomas Monjalon
2021-07-30 13:55   ` [dpdk-dev] [RFC PATCH v2 5/7] hcdev: add memory API Thomas Monjalon
2021-07-30 13:55   ` [dpdk-dev] [RFC PATCH v2 6/7] hcdev: add communication flag Thomas Monjalon
2021-07-30 13:55   ` [dpdk-dev] [RFC PATCH v2 7/7] hcdev: add communication list Thomas Monjalon
2021-07-31  7:06   ` [dpdk-dev] [RFC PATCH v2 0/7] heterogeneous computing library Jerin Jacob
2021-07-31  8:21     ` Thomas Monjalon
2021-07-31 13:42       ` Jerin Jacob
2021-08-27  9:44         ` Thomas Monjalon
2021-08-27 12:19           ` Jerin Jacob
2021-08-29  5:32             ` Wang, Haiyue
2021-09-01 15:35               ` Elena Agostini
2021-09-02 13:12                 ` Jerin Jacob
2021-09-06 16:11                   ` Elena Agostini
2021-09-06 17:15                     ` Wang, Haiyue
2021-09-06 17:22                       ` Elena Agostini
2021-09-07  0:55                         ` Wang, Haiyue
2021-10-09  1:53 ` [dpdk-dev] [PATCH v3 0/9] GPU library eagostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 1/9] gpudev: introduce GPU device class library eagostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 2/9] gpudev: add event notification eagostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 3/9] gpudev: add child device representing a device context eagostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 4/9] gpudev: support multi-process eagostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 5/9] gpudev: add memory API eagostini
2021-10-08 20:18     ` Thomas Monjalon
2021-10-29 19:38     ` Mattias Rönnblom
2021-11-08 15:16       ` Elena Agostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 6/9] gpudev: add memory barrier eagostini
2021-10-08 20:16     ` Thomas Monjalon
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 7/9] gpudev: add communication flag eagostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 8/9] gpudev: add communication list eagostini
2021-10-09  1:53   ` [dpdk-dev] [PATCH v3 9/9] doc: add CUDA example in GPU guide eagostini
2021-10-10 10:16   ` [dpdk-dev] [PATCH v3 0/9] GPU library Jerin Jacob
2021-10-11  8:18     ` Thomas Monjalon
2021-10-11  8:43       ` Jerin Jacob
2021-10-11  9:12         ` Thomas Monjalon
2021-10-11  9:29           ` Jerin Jacob
2021-10-11 10:27             ` Thomas Monjalon
2021-10-11 11:41               ` Jerin Jacob
2021-10-11 12:44                 ` Thomas Monjalon
2021-10-11 13:30                   ` Jerin Jacob
2021-10-19 10:00                     ` Elena Agostini
2021-10-19 18:47                       ` Jerin Jacob
2021-10-19 19:11                         ` Thomas Monjalon
2021-10-19 19:56                           ` [dpdk-dev] [EXT] " Jerin Jacob Kollanukkaran
2021-11-03 19:15 ` [dpdk-dev] [PATCH v4 " eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 1/9] gpudev: introduce GPU device class library eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 2/9] gpudev: add event notification eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 3/9] gpudev: add child device representing a device context eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 4/9] gpudev: support multi-process eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 5/9] gpudev: add memory API eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 6/9] gpudev: add memory barrier eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 7/9] gpudev: add communication flag eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 8/9] gpudev: add communication list eagostini
2021-11-03 19:15   ` [dpdk-dev] [PATCH v4 9/9] doc: add CUDA example in GPU guide eagostini
2021-11-08 18:57 ` [dpdk-dev] [PATCH v5 0/9] GPU library eagostini
2021-11-08 16:25   ` Thomas Monjalon
2021-11-08 18:57   ` [dpdk-dev] [PATCH v5 1/9] gpudev: introduce GPU device class library eagostini
2021-11-08 18:57   ` [dpdk-dev] [PATCH v5 2/9] gpudev: add event notification eagostini
2021-11-08 18:57   ` [dpdk-dev] [PATCH v5 3/9] gpudev: add child device representing a device context eagostini
2021-11-08 18:58   ` [dpdk-dev] [PATCH v5 4/9] gpudev: support multi-process eagostini
2021-11-08 18:58   ` [dpdk-dev] [PATCH v5 5/9] gpudev: add memory API eagostini
2021-11-08 18:58   ` [dpdk-dev] [PATCH v5 6/9] gpudev: add memory barrier eagostini
2021-11-08 18:58   ` [dpdk-dev] [PATCH v5 7/9] gpudev: add communication flag eagostini
2021-11-08 18:58   ` [dpdk-dev] [PATCH v5 8/9] gpudev: add communication list eagostini
2021-11-08 18:58   ` [dpdk-dev] [PATCH v5 9/9] doc: add CUDA example in GPU guide eagostini

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