Re: [PATCH rdma-next v9 4/5] RDMA/bnxt_re: Direct Verbs: Support DBR verbs

[Jason Gunthorpe <jgg@ziepe.ca>]

On Tue, Jan 27, 2026 at 01:30:03PM +0100, Jiri Pirko wrote:
> Tue, Jan 27, 2026 at 11:31:08AM +0100, sriharsha.basavapatna@broadcom.com wrote:
> >From: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
> >
> >The following Direct Verbs (DV) methods have been implemented in
> >this patch.
> >
> >Doorbell Region Direct Verbs:
> >-----------------------------
> >- BNXT_RE_METHOD_DBR_ALLOC:
> >  This will allow the appliation to create extra doorbell regions
> >  and use the associated doorbell page index in DV_CREATE_QP and
> >  use the associated DB address while ringing the doorbell.
> >
> >- BNXT_RE_METHOD_DBR_FREE:
> >  Free the allocated doorbell region.
> >
> >- BNXT_RE_METHOD_GET_DEFAULT_DBR:
> >  Return the default doorbell page index and doorbell page address
> >  associated with the ucontext.
> >
> 
> Similar to CQ/QP, why this is bnxt specific? I know a little about rdma,
> but I believe we use it in mlx5 too, no?

mlx5 has a specific thing too, the doorbell has enough fairly hw
specific properties and never leaks outside the userspace provider.

We consolidated the internal code to manage the mmaps, beyond that
there hasn't been a big push to consolidate more.

Jason