On Tue, Aug 03, 2021 at 03:13:41PM -0300, Jason Gunthorpe wrote:
> On Tue, Aug 03, 2021 at 08:56:54PM +0300, Leon Romanovsky wrote:
> > On Tue, Aug 03, 2021 at 01:25:07PM -0300, Jason Gunthorpe wrote:
> > > On Sun, Aug 01, 2021 at 05:20:50PM +0800, Li Zhijian wrote:
> > > > ibv_advise_mr(3) says:
> > > > EFAULT In one of the following: o When the range requested is out of the MR bounds,
> > > > or when parts of it are not part of the process address space. o One of the
> > > > lkeys provided in the scatter gather list is invalid or with wrong write access
> > > >
> > > > Actually get_prefetchable_mr() will return NULL if it see above conditions
> > >
> > > No, get_prefetchable_mr() returns NULL if the mkey is invalid
> >
> > And what is this?
> > 1701 static struct mlx5_ib_mr *
> > 1702 get_prefetchable_mr(struct ib_pd *pd, enum ib_uverbs_advise_mr_advice advice,
> > 1703 u32 lkey)
> >
> > ...
> >
> > 1721 /* prefetch with write-access must be supported by the MR */
> > 1722 if (advice == IB_UVERBS_ADVISE_MR_ADVICE_PREFETCH_WRITE &&
> > 1723 !mr->umem->writable) {
> > 1724 mr = NULL;
> > 1725 goto end;
> > 1726 }
>
> I would say that is an invalid mkey
I see it is as wrong write access.
Thanks
>
> Jason
