Date:   Fri, 10 Mar 2023 13:09:01 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Gautam Dawar <gautam.dawar@....com>
Cc:     linux-net-drivers@....com, Edward Cree <ecree.xilinx@...il.com>,
        Martin Habets <habetsm.xilinx@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        eperezma@...hat.com, harpreet.anand@....com, tanuj.kamde@....com,
        koushik.dutta@....com
Subject: Re: [PATCH net-next v2 00/14] sfc: add vDPA support for EF100 devices

On Tue, Mar 7, 2023 at 7:36 PM Gautam Dawar <gautam.dawar@....com> wrote:
>
> Hi All,
>
> This series adds the vdpa support for EF100 devices.

Would you mind posting some performance numbers for this device?

Thanks

> For now, only a network class of vdpa device is supported and
> they can be created only on a VF. Each EF100 VF can have one
> of the three function personalities (EF100, vDPA & None) at
> any time with EF100 being the default. A VF's function personality
> is changed to vDPA while creating the vdpa device using vdpa tool.
>
> A vDPA management device is created per VF to allow selection of
> the desired VF for vDPA device creation. The MAC address for the
> target net device must be set either by specifying at the vdpa
> device creation time via the `mac` parameter of the `vdpa dev add`
> command or should be specified as the hardware address of the virtual
> function using `devlink port function set hw_addr` command before
> creating the vdpa device with the former taking precedence.
>
> Changes since v1:
>
> - To ensure isolation between DMA initiated by userspace (guest OS)
>   and the host MCDI buffer, ummap VF's MCDI DMA buffer and use PF's
>   IOMMU domain instead for executing vDPA VF's MCDI commands.
> - As a result of above change, it is no more necessary to check for
>   MCDI buffer's IOVA range overlap with the guest buffers. Accordingly,
>   the DMA config operations and the rbtree/list implementation to store
>   IOVA mappings have been dropped.
> - Support vDPA only if running Firmware supports CLIENT_CMD_VF_PROXY
>   capability.
> - Added .suspend config operation and updated get_vq_state/set_vq_state
>   to support Live Migration. Also, features VIRTIO_F_ORDER_PLATFORM and
>   VIRTIO_F_IN_ORDER have been masked off in get_device_features() to
>   allow Live Migration as QEMU SVQ doesn't support them yet.
> - Removed the minimum version (v6.1.0) requirement of QEMU as
>   VIRTIO_F_IN_ORDER is not exposed
> - Fetch the vdpa device MAC address from the underlying VF hw_addr (if
>   set via `devlink port function set hw_addr` command)
> - Removed the mandatory requirement of specifying mac address while
>   creating vdpa device
> - Moved create_vring_ctx() and get_doorbell_offset() in dev_add()
> - Moved IRQ allocation at the time of vring creation
> - Merged vring_created member of struct ef100_vdpa_vring_info as one
>   of the flags in vring_state
> - Simplified .set_status() implementation
> - Removed un-necessary vdpa_state checks against
>   EF100_VDPA_STATE_INITIALIZED
> - Removed userspace triggerable warning in kick_vq()
> - Updated year 2023 in copyright banner of new files
>
> Gautam Dawar (14):
>   sfc: add function personality support for EF100 devices
>   sfc: implement MCDI interface for vDPA operations
>   sfc: update MCDI headers for CLIENT_CMD_VF_PROXY capability bit
>   sfc: evaluate vdpa support based on FW capability CLIENT_CMD_VF_PROXY
>   sfc: implement init and fini functions for vDPA personality
>   sfc: implement vDPA management device operations
>   sfc: implement vdpa device config operations
>   sfc: implement vdpa vring config operations
>   sfc: implement device status related vdpa config operations
>   sfc: implement filters for receiving traffic
>   sfc: use PF's IOMMU domain for running VF's MCDI commands
>   sfc: unmap VF's MCDI buffer when switching to vDPA mode
>   sfc: update vdpa device MAC address
>   sfc: register the vDPA device
>
>  drivers/net/ethernet/sfc/Kconfig          |    8 +
>  drivers/net/ethernet/sfc/Makefile         |    1 +
>  drivers/net/ethernet/sfc/ef10.c           |    2 +-
>  drivers/net/ethernet/sfc/ef100.c          |    7 +-
>  drivers/net/ethernet/sfc/ef100_netdev.c   |   26 +-
>  drivers/net/ethernet/sfc/ef100_nic.c      |  183 +-
>  drivers/net/ethernet/sfc/ef100_nic.h      |   26 +-
>  drivers/net/ethernet/sfc/ef100_vdpa.c     |  543 +++
>  drivers/net/ethernet/sfc/ef100_vdpa.h     |  224 ++
>  drivers/net/ethernet/sfc/ef100_vdpa_ops.c |  793 ++++
>  drivers/net/ethernet/sfc/mcdi.c           |  108 +-
>  drivers/net/ethernet/sfc/mcdi.h           |    9 +-
>  drivers/net/ethernet/sfc/mcdi_filters.c   |   51 +-
>  drivers/net/ethernet/sfc/mcdi_functions.c |    9 +-
>  drivers/net/ethernet/sfc/mcdi_functions.h |    3 +-
>  drivers/net/ethernet/sfc/mcdi_pcol.h      | 4390 ++++++++++++++++++++-
>  drivers/net/ethernet/sfc/mcdi_vdpa.c      |  259 ++
>  drivers/net/ethernet/sfc/mcdi_vdpa.h      |   83 +
>  drivers/net/ethernet/sfc/net_driver.h     |   21 +
>  drivers/net/ethernet/sfc/ptp.c            |    4 +-
>  20 files changed, 6574 insertions(+), 176 deletions(-)
>  create mode 100644 drivers/net/ethernet/sfc/ef100_vdpa.c
>  create mode 100644 drivers/net/ethernet/sfc/ef100_vdpa.h
>  create mode 100644 drivers/net/ethernet/sfc/ef100_vdpa_ops.c
>  create mode 100644 drivers/net/ethernet/sfc/mcdi_vdpa.c
>  create mode 100644 drivers/net/ethernet/sfc/mcdi_vdpa.h
>
> --
> 2.30.1
>

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