On Fri, Oct 29, 2021 at 01:27:02PM -0300, Jason Gunthorpe wrote:
> On Thu, Oct 28, 2021 at 08:55:22AM +0300, Leon Romanovsky wrote:
> > From: Aharon Landau <aharonl@xxxxxxxxxx>
> >
> > 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..
Why? We see that without this patch MR IOVA is not as expected.
>
> > Signed-off-by: Aharon Landau <aharonl@xxxxxxxxxx>
> > Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
> > 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
I decided to be safe than sorry and removed only 100% correct
attributes that does require minimal audit.
Thanks
>
> Jason
