netdev - Re: [PATCH iproute2 v2] route: label externally offloaded routes

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Date:	Mon, 16 Mar 2015 09:18:05 -0400
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	sfeldma@...il.com
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org,
	jiri@...nulli.us, roopa@...ulusnetworks.com, tarbal@...il.com,
	linville@...driver.com
Subject: Re: [PATCH iproute2 v2] route: label externally offloaded routes

On Sun, Mar 15, 2015 at 12:31:34PM -0700, sfeldma@...il.com wrote:
> From: Scott Feldman <sfeldma@...il.com>
> 
> v2:
> 
> No clear outcome on polling for choices of "external", "offload", "hw", or
> "hardware".  Andy's concern about "external" being confusing for users is
> valid.  So, I'm making executive decision to use "external_offload" for label,
> as suggested by Jiri.

This seems like quite a mouthful.  Just make it 'offload' or 'hardware'
so the output of 'ip route show' isn't so long that it will frequently
be longer than 80 chars.  Being longer than 80 chars is going to be
irritating for _many_ users.

> 
> v1:
> 
> On ip route print dump, label externally offloaded routes with "external".
> Offloaded routes are flagged with RTNH_F_EXTERNAL, a recent additon to
> net-next.  For example:
> 
> $ ip route
> default via 192.168.0.2 dev eth0
> 11.0.0.0/30 dev swp1  proto kernel  scope link  src 11.0.0.2 external
> 11.0.0.4/30 via 11.0.0.1 dev swp1  proto zebra  metric 20 external
> 11.0.0.8/30 dev swp2  proto kernel  scope link  src 11.0.0.10 external
> 11.0.0.12/30 via 11.0.0.9 dev swp2  proto zebra  metric 20 external
> 12.0.0.2  proto zebra  metric 30 external
>         nexthop via 11.0.0.1  dev swp1 weight 1
>         nexthop via 11.0.0.9  dev swp2 weight 1
> 12.0.0.3 via 11.0.0.1 dev swp1  proto zebra  metric 20 external
> 12.0.0.4 via 11.0.0.9 dev swp2  proto zebra  metric 20 external
> 192.168.0.0/24 dev eth0  proto kernel  scope link  src 192.168.0.15

I understand why you did this the way you did (keeping the changelog the
same with the only change being the parts listed in 'v2'), but could you
change the new output to reflect the code change?  Readers of the git
log would probably be confused by this.

(Sorry to debate such a simple patch, but this is the interface most will
use so it seems like a good idea to make sure we are thinking about it
in the proper context.  Healthy debate on the mailing-list seems like a
great way to track the reason behind some of these decisions.)


> Signed-off-by: Scott Feldman <sfeldma@...il.com>
> Acked-by: Jiri Pirko <jiri@...nulli.us>
> ---
>  include/linux/rtnetlink.h |    1 +
>  ip/iproute.c              |    2 ++
>  2 files changed, 3 insertions(+)
> 
> diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
> index 3eb7810..c74773c 100644
> --- a/include/linux/rtnetlink.h
> +++ b/include/linux/rtnetlink.h
> @@ -332,6 +332,7 @@ struct rtnexthop {
>  #define RTNH_F_DEAD		1	/* Nexthop is dead (used by multipath)	*/
>  #define RTNH_F_PERVASIVE	2	/* Do recursive gateway lookup	*/
>  #define RTNH_F_ONLINK		4	/* Gateway is forced on link	*/
> +#define RTNH_F_EXTERNAL		8	/* Route installed externally   */
>  
>  /* Macros to handle hexthops */
>  
> diff --git a/ip/iproute.c b/ip/iproute.c
> index b32025f..ffdf4f2 100644
> --- a/ip/iproute.c
> +++ b/ip/iproute.c
> @@ -412,6 +412,8 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
>  		fprintf(fp, "onlink ");
>  	if (r->rtm_flags & RTNH_F_PERVASIVE)
>  		fprintf(fp, "pervasive ");
> +	if (r->rtm_flags & RTNH_F_EXTERNAL)
> +		fprintf(fp, "external_offload ");
>  	if (r->rtm_flags & RTM_F_NOTIFY)
>  		fprintf(fp, "notify ");
>  	if (tb[RTA_MARK]) {
> -- 
> 1.7.10.4
> 
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