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Date:   Tue, 4 Aug 2020 05:39:58 -0400
From:   "Michael S. Tsirkin" <mst@redhat.com>
To:     Eli Cohen <eli@mellanox.com>
Cc:     jasowang@redhat.com, virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, shahafs@mellanox.com,
        saeedm@mellanox.com, parav@mellanox.com
Subject: Re: [PATCH V3 vhost next 00/10] VDPA support for Mellanox ConnectX
 devices
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On Tue, Aug 04, 2020 at 08:34:32AM +0300, Eli Cohen wrote:
> On Mon, Aug 03, 2020 at 04:51:27PM -0400, Michael S. Tsirkin wrote:
> > On Tue, Jul 28, 2020 at 09:05:29AM +0300, 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
> > 
> > Hmm this makes merging them messy. I can ack merging them through
> > the mellanox tree, but
> > conflicts between Jason's patches and what's in my tree also exist.
> > 
> 
> Let me see if this is something I can fix.
> 
> > How big is the dependency? Can I pick it up with your ack?
> > 
> > Also, mips build failures need to be dealt with.
> > 
> Will look into it.


Thanks!
I'd like to have everything ready by end of week if possible,
send pull next Monday/Tuesday.

> > > 
> > > 
> > > 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
> > > 
> > > -- 
> > > 2.26.0
> >