netdev - Re: [RFC PATCH 03/13] nexthop: Add netlink defines and enumerators for resilient NH groups

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Date:   Sat, 13 Feb 2021 12:16:45 -0700
From:   David Ahern <dsahern@...il.com>
To:     Petr Machata <petrm@...dia.com>, netdev@...r.kernel.org
Cc:     David Ahern <dsahern@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [RFC PATCH 03/13] nexthop: Add netlink defines and enumerators
 for resilient NH groups

On 2/8/21 1:42 PM, Petr Machata wrote:
> @@ -52,8 +53,50 @@ enum {
>  	NHA_FDB,	/* flag; nexthop belongs to a bridge fdb */
>  	/* if NHA_FDB is added, OIF, BLACKHOLE, ENCAP cannot be set */
>  
> +	/* nested; resilient nexthop group attributes */
> +	NHA_RES_GROUP,
> +	/* nested; nexthop bucket attributes */
> +	NHA_RES_BUCKET,
> +
>  	__NHA_MAX,
>  };
>  
>  #define NHA_MAX	(__NHA_MAX - 1)
> +
> +enum {
> +	NHA_RES_GROUP_UNSPEC,
> +	/* Pad attribute for 64-bit alignment. */
> +	NHA_RES_GROUP_PAD = NHA_RES_GROUP_UNSPEC,
> +
> +	/* u32; number of nexthop buckets in a resilient nexthop group */
> +	NHA_RES_GROUP_BUCKETS,

u32 is overkill; arguably u16 (64k) should be more than enough buckets
for any real use case.