linux-kernel - Re: [PATCH rdma-next] RDMA/core: Rely on vendors to set right IOVA

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Message-ID: <20211029162702.GA846504@nvidia.com>
Date:   Fri, 29 Oct 2021 13:27:02 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Doug Ledford <dledford@...hat.com>,
        Aharon Landau <aharonl@...dia.com>,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH rdma-next] RDMA/core: Rely on vendors to set right IOVA

On Thu, Oct 28, 2021 at 08:55:22AM +0300, Leon Romanovsky wrote:
> From: Aharon Landau <aharonl@...dia.com>
> 
> The vendors set the IOVA of newly created MRs in rereg_user_mr, so don't
> overwrite it. That ensures that this field is set only if IB_MR_REREG_TRANS
> flag is provided.
> 
> Fixes: 6e0954b11c05 ("RDMA/uverbs: Allow drivers to create a new HW object during rereg_mr")

This isn't really a fixes type patch..

> Signed-off-by: Aharon Landau <aharonl@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
>  drivers/infiniband/core/uverbs_cmd.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
> index 740e6b2efe0e..d1345d76d9b1 100644
> +++ b/drivers/infiniband/core/uverbs_cmd.c
> @@ -837,11 +837,8 @@ static int ib_uverbs_rereg_mr(struct uverbs_attr_bundle *attrs)
>  		new_mr->device = new_pd->device;
>  		new_mr->pd = new_pd;
>  		new_mr->type = IB_MR_TYPE_USER;
> -		new_mr->dm = NULL;
> -		new_mr->sig_attrs = NULL;
>  		new_mr->uobject = uobj;
>  		atomic_inc(&new_pd->usecnt);
> -		new_mr->iova = cmd.hca_va;
>  		new_uobj->object = new_mr;

It is like this because the reg_mr path does it this way, if you want
to change it here then change reg_mr as well, but that needs auditing
all the drivers..

And I'd also suggest removing the other set a few lines below

Jason