linux-kernel - Re: [PATCH V3 vhost next 00/10] VDPA support for Mellanox ConnectX devices

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Date:   Tue, 28 Jul 2020 14:40:52 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Eli Cohen <eli@...lanox.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, shahafs@...lanox.com,
        saeedm@...lanox.com, parav@...lanox.com
Subject: Re: [PATCH V3 vhost next 00/10] VDPA support for Mellanox ConnectX
 devices


On 2020/7/28 下午2:32, Eli Cohen wrote:
> On Tue, Jul 28, 2020 at 02:18:16PM +0800, Jason Wang wrote:
>> On 2020/7/28 下午2:05, Eli Cohen wrote:
>>> Hi Michael,
>>> please note that this series depends on mlx5 core device driver patches
>>> in mlx5-next branch in
>>> git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git.
>>>
>>> git pull git://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git mlx5-next
>>>
>>> They also depend Jason Wang's patches submitted a couple of weeks ago.
>>>
>>> vdpa_sim: use the batching API
>>> vhost-vdpa: support batch updating
>>
>> Just notice that a new version is posted[1] (you were cced). Talked
>> with Michael, and it's better for you to merge the new version in
>> this series.
>>
> OK, will send again. Just to make sure, I should put your series and my
> series on Michal's vhost branch, the same tree I have been using so far?


Yes. I think so.

Thanks


>
>> Sorry for not spotting this before.
>>
>> [1] https://lkml.org/lkml/2020/7/1/301
>>
>> Thanks
>>
>>
>>>
>>> The following series of patches provide VDPA support for Mellanox
>>> devices. The supported devices are ConnectX6 DX and newer.
>>>
>>> Currently, only a network driver is implemented; future patches will
>>> introduce a block device driver. iperf performance on a single queue is
>>> around 12 Gbps.  Future patches will introduce multi queue support.
>>>
>>> The files are organized in such a way that code that can be used by
>>> different VDPA implementations will be placed in a common are resides in
>>> drivers/vdpa/mlx5/core.
>>>
>>> Only virtual functions are currently supported. Also, certain firmware
>>> capabilities must be set to enable the driver. Physical functions (PFs)
>>> are skipped by the driver.
>>>
>>> To make use of the VDPA net driver, one must load mlx5_vdpa. In such
>>> case, VFs will be operated by the VDPA driver. Although one can see a
>>> regular instance of a network driver on the VF, the VDPA driver takes
>>> precedence over the NIC driver, steering-wize.
>>>
>>> Currently, the device/interface infrastructure in mlx5_core is used to
>>> probe drivers. Future patches will introduce virtbus as a means to
>>> register devices and drivers and VDPA will be adapted to it.
>>>
>>> The mlx5 mode of operation required to support VDPA is switchdev mode.
>>> Once can use Linux or OVS bridge to take care of layer 2 switching.
>>>
>>> In order to provide virtio networking to a guest, an updated version of
>>> qemu is required. This version has been tested by the following quemu
>>> version:
>>>
>>> url: https://github.com/jasowang/qemu.git
>>> branch: vdpa
>>> Commit ID: 6f4e59b807db
>>>
>>>
>>> V2->V3
>>> Fix makefile to use include path relative to the root of the kernel
>>>
>>> Eli Cohen (7):
>>>    net/vdpa: Use struct for set/get vq state
>>>    vhost: Fix documentation
>>>    vdpa: Modify get_vq_state() to return error code
>>>    vdpa/mlx5: Add hardware descriptive header file
>>>    vdpa/mlx5: Add support library for mlx5 VDPA implementation
>>>    vdpa/mlx5: Add shared memory registration code
>>>    vdpa/mlx5: Add VDPA driver for supported mlx5 devices
>>>
>>> Jason Wang (2):
>>>    vhost-vdpa: support batch updating
>>>    vdpa_sim: use the batching API
>>>
>>> Max Gurtovoy (1):
>>>    vdpa: remove hard coded virtq num
>>>
>>>   drivers/vdpa/Kconfig                   |   18 +
>>>   drivers/vdpa/Makefile                  |    1 +
>>>   drivers/vdpa/ifcvf/ifcvf_base.c        |    4 +-
>>>   drivers/vdpa/ifcvf/ifcvf_base.h        |    4 +-
>>>   drivers/vdpa/ifcvf/ifcvf_main.c        |   13 +-
>>>   drivers/vdpa/mlx5/Makefile             |    4 +
>>>   drivers/vdpa/mlx5/core/mlx5_vdpa.h     |   91 ++
>>>   drivers/vdpa/mlx5/core/mlx5_vdpa_ifc.h |  168 ++
>>>   drivers/vdpa/mlx5/core/mr.c            |  473 ++++++
>>>   drivers/vdpa/mlx5/core/resources.c     |  284 ++++
>>>   drivers/vdpa/mlx5/net/main.c           |   76 +
>>>   drivers/vdpa/mlx5/net/mlx5_vnet.c      | 1950 ++++++++++++++++++++++++
>>>   drivers/vdpa/mlx5/net/mlx5_vnet.h      |   24 +
>>>   drivers/vdpa/vdpa.c                    |    3 +
>>>   drivers/vdpa/vdpa_sim/vdpa_sim.c       |   35 +-
>>>   drivers/vhost/iotlb.c                  |    4 +-
>>>   drivers/vhost/vdpa.c                   |   46 +-
>>>   include/linux/vdpa.h                   |   24 +-
>>>   include/uapi/linux/vhost_types.h       |    2 +
>>>   19 files changed, 3165 insertions(+), 59 deletions(-)
>>>   create mode 100644 drivers/vdpa/mlx5/Makefile
>>>   create mode 100644 drivers/vdpa/mlx5/core/mlx5_vdpa.h
>>>   create mode 100644 drivers/vdpa/mlx5/core/mlx5_vdpa_ifc.h
>>>   create mode 100644 drivers/vdpa/mlx5/core/mr.c
>>>   create mode 100644 drivers/vdpa/mlx5/core/resources.c
>>>   create mode 100644 drivers/vdpa/mlx5/net/main.c
>>>   create mode 100644 drivers/vdpa/mlx5/net/mlx5_vnet.c
>>>   create mode 100644 drivers/vdpa/mlx5/net/mlx5_vnet.h
>>>