netdev - Re: [RFC PATCH net-next 05/22] nexthop: Add nexthop notification data structures

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Date:   Tue, 8 Sep 2020 08:43:10 -0600
From:   David Ahern <dsahern@...il.com>
To:     Ido Schimmel <idosch@...sch.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, roopa@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: Re: [RFC PATCH net-next 05/22] nexthop: Add nexthop notification data
 structures

On 9/8/20 3:10 AM, Ido Schimmel wrote:
> From: Ido Schimmel <idosch@...dia.com>
> 
> Add data structures that will be used for nexthop replace and delete
> notifications in the previously introduced nexthop notification chain.
> 
> New data structures are added instead of passing the existing nexthop
> code structures directly for several reasons.
> 
> First, the existing structures encode a lot of bookkeeping information
> which is irrelevant for listeners of the notification chain.
> 
> Second, the existing structures can be changed without worrying about
> introducing regressions in listeners since they are not accessed
> directly by them.
> 
> Third, listeners of the notification chain do not need to each parse the
> relatively complex nexthop code structures. They are passing the
> required information in a simplified way.

agreed. My preference is for only nexthop.{c,h} to understand and parse
the nexthop structs.


> 
> Signed-off-by: Ido Schimmel <idosch@...dia.com>
> ---
>  include/net/nexthop.h | 35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/include/net/nexthop.h b/include/net/nexthop.h
> index 2e44efe5709b..0bde1aa867c0 100644
> --- a/include/net/nexthop.h
> +++ b/include/net/nexthop.h
> @@ -109,6 +109,41 @@ enum nexthop_event_type {
>  	NEXTHOP_EVENT_DEL
>  };
>  
> +struct nh_notifier_single_info {
> +	struct net_device *dev;
> +	u8 gw_family;
> +	union {
> +		__be32 ipv4;
> +		struct in6_addr ipv6;
> +	};
> +	u8 is_reject:1,
> +	   is_fdb:1,
> +	   is_encap:1;

use has_encap since it refers to a configuration of a nexthop versus a
nexthop type.

I take it this is a placeholder until lwt offload is supported?

besides the naming nit,

Reviewed-by: David Ahern <dsahern@...il.com>