[dpdk-dev] [PATCH v1 1/5] lib/eal: implement the family of rte bit operation APIs

[Jerin Jacob]

On Tue, Oct 15, 2019 at 1:20 PM Joyce Kong <joyce.kong at arm.com> wrote:
>
> There are a lot functions of bit operations scattered and
> duplicated in PMDs, consolidating them into a common API
> family is necessary. Furthermore, the bit operation is
> mostly applied to the IO devices, so use __ATOMIC_ACQ_REL
> to ensure the ordering.
>
> Signed-off-by: Joyce Kong <joyce.kong at arm.com>
> ---
>  lib/librte_eal/common/Makefile             |  1 +
>  lib/librte_eal/common/include/rte_bitops.h | 56 ++++++++++++++++++++++++++++++
>  lib/librte_eal/common/meson.build          |  1 +
> +
> +static inline void
> +rte_set_bit(unsigned int nr, unsigned long *addr)
> +{
> +       __atomic_fetch_or(addr, (1UL << nr), __ATOMIC_ACQ_REL);
> +}

If it is specific for IO the IMO, it makes sense call the API to
rte_io_set_bit() like rte_io_rmb
and change the header file to rte_io_bitops.h.

The barries are only needed for IO operations. Explicitly is not
conveying it in API name
would call for using it for normal cases.

Other option could be to introduce, generic and IO specific bit
operations operations
separately.