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From: "Xia, Chenbo" <chenbo.xia@intel.com>
To: David Marchand <david.marchand@redhat.com>
Cc: dev <dev@dpdk.org>, Thomas Monjalon <thomas@monjalon.net>,
	"Stephen Hemminger" <stephen@networkplumber.org>,
	"Liang, Cunming" <cunming.liang@intel.com>,
	"Lu, Xiuchun" <xiuchun.lu@intel.com>,
	"Li, Miao" <miao.li@intel.com>,
	"Wu, Jingjing" <jingjing.wu@intel.com>,
	"Xing, Beilei" <beilei.xing@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2 0/9] Introduce vfio-user library
Date: Tue, 19 Jan 2021 03:13:40 +0000
Message-ID: <MN2PR11MB4063F0CDF882D6432C4D06C09CA30@MN2PR11MB4063.namprd11.prod.outlook.com> (raw)
In-Reply-To: <CAJFAV8wUkO=v4PHu5fCDLArgZnW3e8r0qxuoU3OJeEKnZGhC4Q@mail.gmail.com>

Hi David,

> -----Original Message-----
> From: David Marchand <david.marchand@redhat.com>
> Sent: Friday, January 15, 2021 3:58 PM
> To: Xia, Chenbo <chenbo.xia@intel.com>
> Cc: dev <dev@dpdk.org>; Thomas Monjalon <thomas@monjalon.net>; Stephen
> Hemminger <stephen@networkplumber.org>; Liang, Cunming
> <cunming.liang@intel.com>; Lu, Xiuchun <xiuchun.lu@intel.com>; Li, Miao
> <miao.li@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>
> Subject: Re: [PATCH v2 0/9] Introduce vfio-user library
> 
> Hello Chenbo,
> 
> On Thu, Jan 14, 2021 at 7:19 AM Chenbo Xia <chenbo.xia@intel.com> wrote:
> >
> > This series enables DPDK to be an alternative I/O device emulation library
> of
> > building virtualized devices in separate processes outside QEMU. It
> introduces
> > a new library for device emulation (librte_vfio_user).
> >
> > *librte_vfio_user* library is an implementation of VFIO-over-socket[1] (also
> > known as vfio-user) which is a protocol that allows a device to be
> virtualized
> > in a separate process outside of QEMU.
> >
> > Background & Motivation
> > -----------------------
> > The disaggregated/multi-process QEMU is using VFIO-over-socket/vfio-user
> > as the main transport mechanism to disaggregate IO services from QEMU[2].
> > Vfio-user essentially implements the VFIO device model presented to the
> > user process by a set of messages over a unix-domain socket. The main
> > difference between application using vfio-user and application using vfio
> > kernel module is that device manipulation is based on socket messages for
> > vfio-user but system calls for vfio kernel module. The vfio-user devices
> > consist of a generic VFIO device type, living in QEMU, which is called the
> > client[3], and the core device implementation (emulated device), living
> > outside of QEMU, which is called the server. With emulated devices removed
> > from QEMU enabled by vfio-user implementation, other places should be
> > introduced to accommodate virtualized/emulated device. This series
> introduces
> > vfio-user support in DPDK to enable DPDK as one of the living places for
> > emulated device except QEMU.
> >
> > This series introduce the server and client implementation of vfio-user
> protocol.
> > The server plays the role as emulated devices and the client is the device
> > consumer. With this implementation, DPDK will be enabled to be both device
> > provider and consumer.
> >
> > Design overview
> > ---------------
> >
> > +--------------+     +--------------+
> > | +----------+ |     | +----------+ |
> > | | Generic  | |     | | Emulated | |
> > | | vfio-dev | |     | | device   | |
> > | +----------+ |     | +----|-----+ |
> > | +----------+ |     | +----|-----+ |
> > | | vfio-user| |     | | vfio-user| |
> > | | client   | |<--->| | server   | |
> > | +----------+ |     | +----------+ |
> > | QEMU/DPDK    |     | DPDK         |
> > +--------------+     +--------------+
> >
> > - Generic vfio-dev.
> >   It is the generic vfio framework in vfio applications like QEMU or DPDK.
> >   Applications can keep the most of vfio device management and plug in a
> >   vfio-user device type. Note that in current implementation, we have not
> >   yet integrated client vfio-user into kernel vfio in DPDK but it is viable
> >   and good to do so.
> >
> > - vfio-user client.
> >   For DPDK, it is part of librte_vfio_user implementation to provide ways to
> >   manipulate a vfio-user based emulated devices. This manipulation is very
> >   similar with kernel vfio (i.e., syscalls like ioctl, mmap and
> pread/pwrite).
> >   It is a base for vfio-user device consumer.
> >
> > - vfio-user server.
> >   It is server part of librte_vfio_user. It provides ways to emulate your
> own
> >   device. A device provider could only care about device layout that VFIO
> >   defines but does not need to know how it communicates with vfio-user
> client.
> >
> > - Emulated device.
> >   It is emulated device of any type (e.g., network, crypto and etc.).
> >
> > References
> > ----------
> > [1]: https://patchew.org/QEMU/20201130161229.23164-1-
> thanos.makatos@nutanix.com/
> > [2]: https://wiki.qemu.org/Features/MultiProcessQEMU
> > [3]: https://github.com/oracle/qemu/tree/vfio-user-v0.2
> >
> > ----------------------------------
> > v2:
> >  - Clean up non-static inline function (Stephen)
> >  - Naturally pack vfio-user message payload and header (Stephen)
> >  - Make function definiton align with coding style (Beilei)
> >  - Clean up duplicate code in vfio-user server APIs (Beilei)
> >  - Fix some typos
> 
> 
> GHA (called by the robot) caught various issues:
> - doc:
> https://github.com/ovsrobot/dpdk/runs/1700373705?check_suite_focus=true#step:1
> 4:3407
> - clang:
> https://github.com/ovsrobot/dpdk/runs/1700373722?check_suite_focus=true#step:1
> 4:1050
> - i386:
> https://github.com/ovsrobot/dpdk/runs/1700373747?check_suite_focus=true#step:1
> 4:2607
> - aarch64:
> https://github.com/ovsrobot/dpdk/runs/1700373764?check_suite_focus=true#step:1
> 4:2848
> and
> https://github.com/ovsrobot/dpdk/runs/1700373770?check_suite_focus=true#step:1
> 4:2880

Thanks! Will fix in next version.

Chenbo
> 
> 
> --
> David Marchand


      reply	other threads:[~2021-01-19  3:13 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-18  7:38 [dpdk-dev] [PATCH " Chenbo Xia
2020-12-18  7:38 ` [dpdk-dev] [PATCH 1/9] lib: introduce " Chenbo Xia
2020-12-18 17:13   ` Stephen Hemminger
2020-12-19  6:12     ` Xia, Chenbo
2020-12-18 17:17   ` Stephen Hemminger
2020-12-19  6:25     ` Xia, Chenbo
2020-12-18  7:38 ` [dpdk-dev] [PATCH 2/9] vfio_user: implement lifecycle related APIs Chenbo Xia
2021-01-05  8:34   ` Xing, Beilei
2021-01-05  9:58     ` Xia, Chenbo
2020-12-18  7:38 ` [dpdk-dev] [PATCH 3/9] vfio_user: implement device and region " Chenbo Xia
2021-01-06  5:51   ` Xing, Beilei
2021-01-06  7:50     ` Xia, Chenbo
2020-12-18  7:38 ` [dpdk-dev] [PATCH 4/9] vfio_user: implement DMA table and socket address API Chenbo Xia
2020-12-18  7:38 ` [dpdk-dev] [PATCH 5/9] vfio_user: implement interrupt related APIs Chenbo Xia
2020-12-30  1:04   ` Wu, Jingjing
2020-12-30  2:31     ` Xia, Chenbo
2020-12-18  7:38 ` [dpdk-dev] [PATCH 6/9] vfio_user: add client APIs of device attach/detach Chenbo Xia
2020-12-18  7:38 ` [dpdk-dev] [PATCH 7/9] vfio_user: add client APIs of DMA/IRQ/region Chenbo Xia
2021-01-07  2:41   ` Xing, Beilei
2021-01-07  7:26     ` Xia, Chenbo
2020-12-18  7:38 ` [dpdk-dev] [PATCH 8/9] test/vfio_user: introduce functional test Chenbo Xia
2020-12-18  7:38 ` [dpdk-dev] [PATCH 9/9] doc: add vfio-user library guide Chenbo Xia
2021-01-06  5:07   ` Xing, Beilei
2021-01-06  7:43     ` Xia, Chenbo
2020-12-18  9:37 ` [dpdk-dev] [PATCH 0/9] Introduce vfio-user library David Marchand
2020-12-18 14:07   ` Thanos Makatos
2021-01-14  6:14 ` [dpdk-dev] [PATCH v2 " Chenbo Xia
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 1/9] lib: introduce " Chenbo Xia
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 2/9] vfio_user: implement lifecycle related APIs Chenbo Xia
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 3/9] vfio_user: implement device and region " Chenbo Xia
2021-01-14 18:48     ` David Christensen
2021-01-19  3:22       ` Xia, Chenbo
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 4/9] vfio_user: implement DMA table and socket address API Chenbo Xia
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 5/9] vfio_user: implement interrupt related APIs Chenbo Xia
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 6/9] vfio_user: add client APIs of device attach/detach Chenbo Xia
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 7/9] vfio_user: add client APIs of DMA/IRQ/region Chenbo Xia
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 8/9] test/vfio_user: introduce functional test Chenbo Xia
2021-01-14 19:03     ` David Christensen
2021-01-19  3:27       ` Xia, Chenbo
2021-01-19 18:26         ` David Christensen
2021-01-14  6:14   ` [dpdk-dev] [PATCH v2 9/9] doc: add vfio-user library guide Chenbo Xia
2021-01-15  7:58   ` [dpdk-dev] [PATCH v2 0/9] Introduce vfio-user library David Marchand
2021-01-19  3:13     ` Xia, Chenbo [this message]

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