netdev - Re: [PATCH net-next 3/3 v3] iproute2: add support to print 'linkdown' nexthop flag

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Date:	Wed, 10 Jun 2015 20:02:26 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	Andy Gospodarek <gospo@...ulusnetworks.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, ddutt@...ulusnetworks.com,
	Alexander Duyck <alexander.duyck@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: Re: [PATCH net-next 3/3 v3] iproute2: add support to print 'linkdown'
 nexthop flag

On Wed, Jun 10, 2015 at 7:37 PM, Andy Gospodarek
<gospo@...ulusnetworks.com> wrote:
> Signed-off-by: Andy Gospodaerk <gospo@...ulusnetworks.com>
> Signed-off-by: Dinesh Dutt <ddutt@...ulusnetworks.com>
>
> ---
>  ip/iproute.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/ip/iproute.c b/ip/iproute.c
> index 3795baf..3369c49 100644
> --- a/ip/iproute.c
> +++ b/ip/iproute.c
> @@ -451,6 +451,8 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
>                 fprintf(fp, "offload ");
>         if (r->rtm_flags & RTM_F_NOTIFY)
>                 fprintf(fp, "notify ");
> +       if (r->rtm_flags & RTNH_F_LINKDOWN)
> +               fprintf(fp, "linkdown ");

This seems confusing for ECMP case where only some nexthop devs are
RTNH_F_LINKDOWN?   Why mark entire route "linkdown" when it still has
viable nexthop devs for ECMP?


>         if (tb[RTA_MARK]) {
>                 unsigned int mark = *(unsigned int*)RTA_DATA(tb[RTA_MARK]);
>                 if (mark) {
> @@ -670,6 +672,8 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
>                                 fprintf(fp, " onlink");
>                         if (nh->rtnh_flags & RTNH_F_PERVASIVE)
>                                 fprintf(fp, " pervasive");
> +                       if (nh->rtnh_flags & RTNH_F_LINKDOWN)
> +                               fprintf(fp, " linkdown");
>                         len -= NLMSG_ALIGN(nh->rtnh_len);
>                         nh = RTNH_NEXT(nh);
>                 }
> --
> 1.9.3
>
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