netdev - Re: [PATCH iproute2-next v2 1/4] utils: Introduce and use inet_prefix_reset

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Date:   Mon, 12 Feb 2018 13:08:13 -0700
From:   David Ahern <dsahern@...il.com>
To:     Serhey Popovych <serhe.popovych@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2-next v2 1/4] utils: Introduce and use
 inet_prefix_reset_flags()

On 2/11/18 1:02 PM, Serhey Popovych wrote:
> Initializing @inet_prefix using C initializers or memset() seems
> inefficient and unnecessary: only small part of ->data[] field will be
> used to store address corresponding to ->family.
> 
> Instead initialize ->flags with zero and assume no other fields accessed
> before checking corresponding bits in ->flags. For example special
> helpers (e.g. is_addrtype_*()) can be used to ensure that @inet_prefix
> contains valid ip or ipv6 address.
> 
> Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
> ---
>  include/utils.h    |    5 +++++
>  ip/iplink_geneve.c |    2 +-
>  ip/iplink_vxlan.c  |    7 ++++---
>  3 files changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/include/utils.h b/include/utils.h
> index 4dc514d..ccbf353 100644
> --- a/include/utils.h
> +++ b/include/utils.h
> @@ -65,6 +65,11 @@ enum {
>  	ADDRTYPE_INET_MULTI	= ADDRTYPE_INET | ADDRTYPE_MULTI
>  };
>  
> +static inline void inet_prefix_reset_flags(inet_prefix *p)
> +{
> +	p->flags = 0;
> +}
> +

I think inet_prefix_reset is sufficient; flags is an implementation detail.