netdev - Re: [PATCH iproute2] ip: change flag names to an array

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Date:   Sat, 8 Jul 2017 15:08:12 +0900
From:   Lorenzo Colitti <lorenzo@...gle.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2] ip: change flag names to an array

On Sat, Jul 8, 2017 at 12:39 AM, Stephen Hemminger
<stephen@...workplumber.org> wrote:
> For the most of the address flags, use a table of bit values rather
> than open coding every value.  This allows for easier inevitable
> expansion of flags.

Thanks for doing this.

> +static unsigned int get_ifa_flag_mask(const char *name)
> +{
> +       unsigned int i;
> +
> +       for (i = 0; i < ARRAY_SIZE(ifa_flag_names); i++) {
> +               if (!strcmp(name, ifa_flag_names[i]))
> +                       return 1u << i;
> +       }
> +       return 0;
> +}

It looks like the user can specify things such as "-deprecated".
Perhaps that sort of thing can be handled by this function too?
Instead of returning an unsigned int, this function could be void and
take a flag value and a mask as output parameters. If the flag name
starts with "-" it would set the value to 0, and if it doesn't it
would set the value to 1.

Otherwise, some of the -<flag> parameters will either need to be
special cased or cease to be supported. Specifically, I see this one:

> -               } else if (strcmp(*argv, "-tentative") == 0) {
> -                       filter.flags &= ~IFA_F_TENTATIVE;
> -                       filter.flagmask |= IFA_F_TENTATIVE;

this one:

> -               } else if (strcmp(*argv, "-deprecated") == 0) {
> -                       filter.flags &= ~IFA_F_DEPRECATED;
> -                       filter.flagmask |= IFA_F_DEPRECATED;

and this one:

> -               } else if (strcmp(*argv, "-dadfailed") == 0) {
> -                       filter.flags &= ~IFA_F_DADFAILED;
> -                       filter.flagmask |= IFA_F_DADFAILED;