netdev - Re: [PATCH net-next v4 2/3] net: ipv4: add sysctl for nexthop api compatibility mode

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Date:   Mon, 27 Apr 2020 15:06:34 -0600
From:   David Ahern <dsahern@...il.com>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, rdunlap@...radead.org,
        nikolay@...ulusnetworks.com, bpoirier@...ulusnetworks.com
Subject: Re: [PATCH net-next v4 2/3] net: ipv4: add sysctl for nexthop api
 compatibility mode

On 4/27/20 2:56 PM, Roopa Prabhu wrote:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>
> 
> Current route nexthop API maintains user space compatibility
> with old route API by default. Dumps and netlink notifications
> support both new and old API format. In systems which have
> moved to the new API, this compatibility mode cancels some
> of the performance benefits provided by the new nexthop API.
> 
> This patch adds new sysctl nexthop_compat_mode which is on
> by default but provides the ability to turn off compatibility
> mode allowing systems to run entirely with the new routing
> API. Old route API behaviour and support is not modified by this
> sysctl.
> 
> Uses a single sysctl to cover both ipv4 and ipv6 following
> other sysctls. Covers dumps and delete notifications as
> suggested by David Ahern.
> 
> Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
> ---
>  Documentation/networking/ip-sysctl.txt | 12 ++++++++++++
>  include/net/netns/ipv4.h               |  2 ++
>  net/ipv4/af_inet.c                     |  1 +
>  net/ipv4/fib_semantics.c               |  3 +++
>  net/ipv4/nexthop.c                     |  5 +++--
>  net/ipv4/sysctl_net_ipv4.c             |  9 +++++++++
>  net/ipv6/route.c                       |  3 ++-
>  7 files changed, 32 insertions(+), 3 deletions(-)
> 

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