netdev - Re: [Patch nf-next] netfilter: make xt

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Date:   Thu, 01 Mar 2018 20:21:52 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Cc:     netfilter-devel@...r.kernel.org, Florian Westphal <fw@...len.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: Re: [Patch nf-next] netfilter: make xt_rateest hash table per net

On Thu, 2018-03-01 at 18:58 -0800, Cong Wang wrote:
> As suggested by Eric, we need to make the xt_rateest
> hash table and its lock per netns to reduce lock
> contentions.
> 
> Cc: Florian Westphal <fw@...len.de>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Pablo Neira Ayuso <pablo@...filter.org>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
> ---
>  include/net/netfilter/xt_rateest.h |  4 +-
>  net/netfilter/xt_RATEEST.c         | 91 +++++++++++++++++++++++++++-----------
>  net/netfilter/xt_rateest.c         | 10 ++---
>  3 files changed, 72 insertions(+), 33 deletions(-)

Very nice, thanks !

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Although the main reason was to avoid name collisions between different
netns.

Hash table is small enough that it can be allocated for each netns.