Re: [PATCH rdma-next 2/2] IB/mlx5: Test write combining support

[Leon Romanovsky <leonro@mellanox.com>]

On Sun, Oct 20, 2019 at 09:44:00AM +0300, Leon Romanovsky wrote:
> From: Michael Guralnik <michaelgur@mellanox.com>
>
> Add a test in mlx5_ib initialization process to test whether
> write-combining is supported on the machine.
> The test will run as part of the enable_driver callback to ensure that
> the test runs after the device is setup and can create and modify the
> QP needed, but runs before the device is exposed to the users.
>
> The test opens UD QP and posts NOP WQEs, the WQE written to the BlueFlame
> is different from the WQE in memory, requesting CQE only on the BlueFlame
> WQE. By checking whether we received a completion on one of these WQEs we
> can know if BlueFlame succeeded and whether write-combining is supported.
>
> Change reporting of BlueFlame support to be dependent on write-combining
> support.
>
> Signed-off-by: Michael Guralnik <michaelgur@mellanox.com>
> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
> ---
>  drivers/infiniband/hw/mlx5/main.c    |  15 +-
>  drivers/infiniband/hw/mlx5/mem.c     | 200 +++++++++++++++++++++++++++
>  drivers/infiniband/hw/mlx5/mlx5_ib.h |   6 +
>  drivers/infiniband/hw/mlx5/qp.c      |   6 +-
>  4 files changed, 224 insertions(+), 3 deletions(-)
>

We found statistical failure with this patch and I'll resend it.

Thanks