Re: [PATCHv4 for-next 1/1] RDMA/irdma: Add support for dmabuf pin memory regions

[Jason Gunthorpe <jgg@nvidia.com>]

On Fri, Feb 17, 2023 at 09:14:25AM +0800, Zhu Yanjun wrote:
> From: Zhu Yanjun <yanjun.zhu@linux.dev>
> 
> This is a followup to the EFA dmabuf[1]. Irdma driver currently does
> not support on-demand-paging(ODP). So it uses habanalabs as the
> dmabuf exporter, and irdma as the importer to allow for peer2peer
> access through libibverbs.
> 
> In this commit, the function ib_umem_dmabuf_get_pinned() is used.
> This function is introduced in EFA dmabuf[1] which allows the driver
> to get a dmabuf umem which is pinned and does not require move_notify
> callback implementation. The returned umem is pinned and DMA mapped
> like standard cpu umems, and is released through ib_umem_release().
> 
> [1]https://lore.kernel.org/lkml/20211007114018.GD2688930@ziepe.ca/t/
> 
> Reviewed-by: Shiraz Saleem <shiraz.saleem@intel.com>
> Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
> ---
> V3->V4: Remove inlen test
> V2->V3: Remove unnecessary variable initialization;
>         Use error handler;
> V1->V2: Thanks Shiraz Saleem, he gave me a lot of good suggestions.
>         This commit is based on the shared functions from refactored
>         irdma_reg_user_mr.
> ---
>  drivers/infiniband/hw/irdma/verbs.c | 42 +++++++++++++++++++++++++++++
>  1 file changed, 42 insertions(+)

Applied to for-next, thanks

Jason