RE: [PATCH v3 rdma-next 07/10] mlx4_ib: set user mr attributes in struct ib_mr

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> > > >
> > > > On Mon, Feb 26, 2018 at 03:22:38PM -0800, Steve Wise wrote:
> > > > > Setting iova, length, and page_size allows this information to be
> > > > > seen via NLDEV netlink queries, which can aid in user rdma
debugging.
> > > > >
> > > > > Signed-off-by: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
> > > > > drivers/infiniband/hw/mlx4/mr.c | 3 +++
> > > > >  1 file changed, 3 insertions(+)
> > > > >
> > > > > diff --git a/drivers/infiniband/hw/mlx4/mr.c
> > > > b/drivers/infiniband/hw/mlx4/mr.c
> > > > > index 4975f3e..17f4f15 100644
> > > > > +++ b/drivers/infiniband/hw/mlx4/mr.c
> > > > > @@ -407,6 +407,9 @@ struct ib_mr *mlx4_ib_reg_user_mr(struct ib_pd
> > > > > *pd,
> > > > u64 start, u64 length,
> > > > >  		goto err_mr;
> > > > >
> > > > >  	mr->ibmr.rkey = mr->ibmr.lkey = mr->mmr.key;
> > > > > +	mr->ibmr.length = length;
> > > > > +	mr->ibmr.iova = virt_addr;
> > > > > +	mr->ibmr.page_size = 1U << shift;
> > > >
> > > > I wonder how many other drivers will have updates like this.
> > >
> > > I can't test the other drivers for lack of hardware.  They can be
> > > fixed as the vendors discover them.  OR, we don't dump any of this for
> > > MRs.  And with the up and coming provider-specific resources, that
> > > will probably be dumped anyway.
> > >
> > > Should I just remove dumping of length/iova/page_size?
> >
> > We certainly have a problem if iova/length is uninited kernel memory in
any
> > driver. :(
> >
> Given that iova and length are user provided inputs to register a MR,
shouldn't
> they be stored to mr->ibmr by ib_core and not by every provider drivers?

The page_size is computed by the provider, so that field, at least should be
filled in by the provider. 



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