Re: [PATCH rdma-next v2 1/1] RDMA/mana_ib: memory windows

[Leon Romanovsky <leon@kernel.org>]

On Wed, Mar 18, 2026 at 10:23:23AM -0700, Konstantin Taranov wrote:
> From: Konstantin Taranov <kotaranov@microsoft.com>
> 
> Implement .alloc_mw() and .dealloc_mw() for mana device.
> 
> Signed-off-by: Konstantin Taranov <kotaranov@microsoft.com>
> ---
> v2: fixed comments. Cleaned up the use of mana_gd_send_request()
>  drivers/infiniband/hw/mana/device.c  |  3 ++
>  drivers/infiniband/hw/mana/mana_ib.h |  8 +++++
>  drivers/infiniband/hw/mana/mr.c      | 53 +++++++++++++++++++++++++++-
>  include/net/mana/gdma.h              |  5 +++
>  4 files changed, 68 insertions(+), 1 deletion(-)

<...>

> +static int mana_ib_gd_create_mw(struct mana_ib_dev *dev, struct mana_ib_pd *pd, struct ib_mw *ibmw)
> +{
> +	struct mana_ib_mw *mw = container_of(ibmw, struct mana_ib_mw, ibmw);
> +	struct gdma_context *gc = mdev_to_gc(dev);
> +	struct gdma_create_mr_response resp = {};
> +	struct gdma_create_mr_request req = {};
> +	int err;
> +
> +	mana_gd_init_req_hdr(&req.hdr, GDMA_CREATE_MR, sizeof(req), sizeof(resp));
> +	req.pd_handle = pd->pd_handle;

Both sashiko, which runs on Gemnini https://sashiko.dev/#/patchset/20260318172323.1416803-1-kotaranov@linux.microsoft.com
and my local claude checks pointed to the same area of the code:

   25 > +     mana_gd_init_req_hdr(&req.hdr, GDMA_CREATE_MR, sizeof(req), sizeof(resp));
   26 > +     req.pd_handle = pd->pd_handle;
   27
   28 mana_gd_init_req_hdr() sets msg_version to GDMA_MESSAGE_V1.
   29 mana_ib_gd_create_mr() explicitly upgrades this to GDMA_MESSAGE_V2
   30 for all GDMA_CREATE_MR requests, regardless of mr_type:
   31
   32 mana_ib_gd_create_mr() {
   33         mana_gd_init_req_hdr(&req.hdr, GDMA_CREATE_MR, ...);
   34         req.hdr.req.msg_version = GDMA_MESSAGE_V2;
   35         ...
   36 }
   37
   38 Is it intentional that mana_ib_gd_create_mw() sends GDMA_CREATE_MR
   39 at GDMA_MESSAGE_V1 rather than GDMA_MESSAGE_V2?

Thanks