netdev - Re: [PATCH net-next] net: nexthop: reduce rcu synchronizations when replacing resilient groups

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Message-ID: <8b4a8d7c-a801-fc91-90a1-c973deb07eed@gmail.com>
Date:   Mon, 29 Nov 2021 08:32:11 -0700
From:   David Ahern <dsahern@...il.com>
To:     Nikolay Aleksandrov <razor@...ckwall.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org,
        Nikolay Aleksandrov <nikolay@...dia.com>,
        Ido Schimmel <idosch@...sch.org>
Subject: Re: [PATCH net-next] net: nexthop: reduce rcu synchronizations when
 replacing resilient groups

On 11/29/21 5:09 AM, Nikolay Aleksandrov wrote:
> From: Nikolay Aleksandrov <nikolay@...dia.com>
> 
> We can optimize resilient nexthop group replaces by reducing the number of
> synchronize_net calls. After commit 1005f19b9357 ("net: nexthop: release
> IPv6 per-cpu dsts when replacing a nexthop group") we always do a
> synchronize_net because we must ensure no new dsts can be created for the
> replaced group's removed nexthops, but we already did that when replacing
> resilient groups, so if we always call synchronize_net after any group
> type replacement we'll take care of both cases and reduce synchronize_net
> calls for resilient groups.
> 
> Suggested-by: Ido Schimmel <idosch@...sch.org>
> Signed-off-by: Nikolay Aleksandrov <nikolay@...dia.com>
> ---
>  net/ipv4/nexthop.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>