netdev - Re: [patch net-next 10/21] ipv6: fib: Add offload indication to routes

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Date:   Thu, 3 Aug 2017 10:39:47 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, mlxsw@...lanox.com,
        roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
        kafai@...com, hannes@...essinduktion.org, yoshfuji@...ux-ipv6.org,
        edumazet@...gle.com, yanhaishuang@...s.chinamobile.com
Subject: Re: [patch net-next 10/21] ipv6: fib: Add offload indication to
 routes

On 8/3/17 5:28 AM, Jiri Pirko wrote:
> diff --git a/include/uapi/linux/ipv6_route.h b/include/uapi/linux/ipv6_route.h
> index d496c02..33e2a57 100644
> --- a/include/uapi/linux/ipv6_route.h
> +++ b/include/uapi/linux/ipv6_route.h
> @@ -35,6 +35,7 @@
>  #define RTF_PREF(pref)	((pref) << 27)
>  #define RTF_PREF_MASK	0x18000000
>  
> +#define RTF_OFFLOAD	0x20000000	/* offloaded route		*/
>  #define RTF_PCPU	0x40000000	/* read-only: can not be set by user */
>  #define RTF_LOCAL	0x80000000

PCPU as a UAPI flag was a mistake; it is a flag internal to IPv6 stack
and really makes no sense to the user. The OFFLOAD should not follow
suit especially given the limited uapi bits left.