IB/mlx5: Add advise_mr() support

The verb advise_mr() is used to give advice to the kernel about an address
range that belongs to a MR.  Implement the verb and register it on the
device. The current implementation supports the only known advice to date,
prefetch.

Signed-off-by: Moni Shoua <monis@mellanox.com>
Reviewed-by: Guy Levi <guyle@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/mr.c

@@ -1280,6 +1280,21 @@ err_free:
 	return ERR_PTR(err);
 }
 
+int mlx5_ib_advise_mr(struct ib_pd *pd,
+		      enum ib_uverbs_advise_mr_advice advice,
+		      u32 flags,
+		      struct ib_sge *sg_list,
+		      u32 num_sge,
+		      struct uverbs_attr_bundle *attrs)
+{
+	if (advice != IB_UVERBS_ADVISE_MR_ADVICE_PREFETCH &&
+	    advice != IB_UVERBS_ADVISE_MR_ADVICE_PREFETCH_WRITE)
+		return -EOPNOTSUPP;
+
+	return mlx5_ib_advise_mr_prefetch(pd, advice, flags,
+					 sg_list, num_sge);
+}
+
 struct ib_mr *mlx5_ib_reg_dm_mr(struct ib_pd *pd, struct ib_dm *dm,
 				struct ib_dm_mr_attr *attr,
 				struct uverbs_attr_bundle *attrs)