[PATCH i-g-t v1 3/4] lib/igt_sriov_device: Add helper to iterate over VFs from starting number

[Michal Wajdeczko]

On 24.01.2025 09:10, Lukasz Laguna wrote:
> Helper allows to iterate over VFs associated with given PF, starting
> from a specified VF number.
> 
> Signed-off-by: Lukasz Laguna <lukasz.laguna at intel.com>
> ---
>  lib/igt_sriov_device.h | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/lib/igt_sriov_device.h b/lib/igt_sriov_device.h
> index de25a7d98..741b1bcec 100644
> --- a/lib/igt_sriov_device.h
> +++ b/lib/igt_sriov_device.h
> @@ -86,6 +86,21 @@ igt_sriov_random_vf_in_range(int pf_fd, unsigned int start, unsigned int end)
>  	     ++__vf_num)
>  #define for_each_sriov_num_vfs for_each_sriov_vf
>  
> +/**
> + * for_each_sriov_vf_starting_from - Iterate over VFs starting from a specified VF
> + * @__pf_fd: PF device file descriptor
> + * @__start: Starting VF number
> + * @__vf_num: VFs iterator
> + *
> + * For loop that iterates over VFs associated with given PF @__pf_fd,
> + * starting from a specified VF number @__start.
> + */
> +#define for_each_sriov_vf_starting_from(__pf_fd, __start, __vf_num) \

nit: there is no need to use underscore for the macro params as all will
be expanded/replaced as-is

> +	for (unsigned int __vf_num = __start, __total_vfs = igt_sriov_get_total_vfs(__pf_fd); \

macro param "start" shall be wrapped in ( )

> +	     __vf_num <= __total_vfs; \
> +	     ++__vf_num)

macro param "vf_num" shall be wrapped in ( )

and there is a risk of param re-evaluation due to param reuse
maybe just add new local temp var for it?

> +#define for_each_sriov_num_vfs_starting_from for_each_sriov_vf_starting_from

why do we need another alias for this new macro?
if the original name is wrong then just use a better one ;)

> +
>  /**
>   * for_random_sriov_vf_in_range - Iterate over a random VF in a specified range
>   * @__pf_fd: PF device file descriptor