Re: [PATCH v3 11/11] vfio: selftests: mlx5 driver - add send_msi support

On 2026-07-16 02:03 PM, Jason Gunthorpe wrote:
> Wire an MSI-X vector to a dedicated EQ so the mlx5 driver supports
> send_msi().
> 
> Each EQ can be linked to an MSI-X vector, and the CQ can be set up
> to deliver an event to the EQ. Thus, when everything is armed, an
> RDMA WRITE posted to the QP generates a CQE, which generates an
> EQE, which generates an MSI-X.
> 
> To keep things simple this just re-uses all the existing QPs and
> CQs, so they generate single MSIs during memcpy.
> 
> send_msi() drains any accumulated MSI EQ events from prior memcpy
> completions, posts a small signaled RDMA Write, then polls the CQ to
> consume the resulting CQE (avoiding stale completions on subsequent
> test cycles).
> 
> Assisted-by: Claude:claude-opus-4.6
> Signed-off-by: Jason Gunthorpe <[email protected]>

Acked-by: David Matlack <[email protected]>