On Mon, Jan 28, 2019 at 12:12:23PM +0200, Shamir Rabinovitch wrote:
> Helper function to get driver's context out of ib_udata wrapped
> in uverbs_attr_bundle for uer objects or NULL for kernel objects.
>
> Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@xxxxxxxxxx>
> include/rdma/ib_verbs.h | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> index 94b6e1dd4dab..fb4d078d6db3 100644
> +++ b/include/rdma/ib_verbs.h
> @@ -4264,4 +4264,18 @@ static inline struct ib_device *rdma_device_to_ibdev(struct device *device)
> */
> #define rdma_device_to_drv_device(dev, drv_dev_struct, ibdev_member) \
> container_of(rdma_device_to_ibdev(dev), drv_dev_struct, ibdev_member)
> +
> +/**
> + * rdma_udata_to_drv_context - Helper macro to get the driver's context out of
> + * ib_udata which is embadded in uverbs_attr_bundle.
> + *
> + * NOTE: This macro return NULL for kernel objects and valid driver context for
> + * user objects.
> + */
> +#define rdma_udata_to_drv_context(udata, drv_dev_struct, member) \
> + ({ struct ib_ucontext *_ibctx = rdma_get_ucontext(udata); \
> + IS_ERR(_ibctx) ? NULL : \
> + container_of(_ibctx, drv_dev_struct, member); \
> + })
This macro body is the same as container_of_safe
Jason
