On Thu, Dec 20, 2018 at 07:29:56PM +0200, Leon Romanovsky wrote:
> On Thu, Dec 20, 2018 at 05:20:51PM +0000, Jason Gunthorpe wrote:
> > On Thu, Dec 20, 2018 at 11:23:15AM +0200, Leon Romanovsky wrote:
> > > From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
> > >
> > > Device capability bits are exposing what specific device supports from
> > > HW perspective. Those bits are not dependent on kernel configurations
> > > and RDMA/core should ensure that proper interfaces to users will be
> > > disabled if CONFIG_INFINIBAND_ON_DEMAND_PAGING is not set.
> > >
> > > Fixes: f4056bfd8ccf ("IB/core: Add on demand paging caps to ib_uverbs_ex_query_device")
> > > Fixes: 8cdd312cfed7 ("IB/mlx5: Implement the ODP capability query verb")
> > > Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
> > > drivers/infiniband/core/uverbs_cmd.c | 2 --
> > > drivers/infiniband/hw/mlx5/main.c | 2 --
> > > 2 files changed, 4 deletions(-)
> > >
> > > diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
> > > index 6b12cc5f97b2..549d9eedf62e 100644
> > > +++ b/drivers/infiniband/core/uverbs_cmd.c
> > > @@ -3609,7 +3609,6 @@ static int ib_uverbs_ex_query_device(struct uverbs_attr_bundle *attrs)
> > >
> > > copy_query_dev_fields(ucontext, &resp.base, &attr);
> > >
> > > -#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
> > > resp.odp_caps.general_caps = attr.odp_caps.general_caps;
> > > resp.odp_caps.per_transport_caps.rc_odp_caps =
> > > attr.odp_caps.per_transport_caps.rc_odp_caps;
> > > @@ -3617,7 +3616,6 @@ static int ib_uverbs_ex_query_device(struct uverbs_attr_bundle *attrs)
> > > attr.odp_caps.per_transport_caps.uc_odp_caps;
> > > resp.odp_caps.per_transport_caps.ud_odp_caps =
> > > attr.odp_caps.per_transport_caps.ud_odp_caps;
> > > -#endif
> >
> > This one is maybe OK, assuming the driver fills in 0..
> >
> > > resp.timestamp_mask = attr.timestamp_mask;
> > > resp.hca_core_clock = attr.hca_core_clock;
> > > diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
> > > index 6584e638387a..d7e5ba5034aa 100644
> > > +++ b/drivers/infiniband/hw/mlx5/main.c
> > > @@ -923,11 +923,9 @@ static int mlx5_ib_query_device(struct ib_device *ibdev,
> > > props->hca_core_clock = MLX5_CAP_GEN(mdev, device_frequency_khz);
> > > props->timestamp_mask = 0x7FFFFFFFFFFFFFFFULL;
> > >
> > > -#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
> > > if (MLX5_CAP_GEN(mdev, pg))
> > > props->device_cap_flags |= IB_DEVICE_ON_DEMAND_PAGING;
> > > props->odp_caps = dev->odp_caps;
> > > -#endif
> >
> > But shouldn't this be protected? If the driver has compiled out ODP it
> > shouldn't set the cap flag...
>
> I see those capabilities as device properties and not as kernel ones.
>
> Current situation looks bad for me, when I have same device which
> reports differently information depends on some compilation flag.
It is not device capabilities, it is a kernel API capability if the
API is not available the bit should not be set.
The field is badly named.
Jason
