netdev - Re: [PATCH 00/14] Modify action API for implementing lockless actions

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Date:   Mon, 14 May 2018 14:03:20 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Vlad Buslov <vladbu@...lanox.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, xiyou.wangcong@...il.com, jiri@...nulli.us,
        pablo@...filter.org, kadlec@...ckhole.kfki.hu, fw@...len.de,
        ast@...nel.org, daniel@...earbox.net, edumazet@...gle.com,
        keescook@...omium.org, linux-kernel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        kliteyn@...lanox.com
Subject: Re: [PATCH 00/14] Modify action API for implementing lockless actions

On 14/05/18 10:27 AM, Vlad Buslov wrote:
> Currently, all netlink protocol handlers for updating rules, actions and
> qdiscs are protected with single global rtnl lock which removes any
> possibility for parallelism. This patch set is a first step to remove
> rtnl lock dependency from TC rules update path. It updates act API to
> use atomic operations, rcu and spinlocks for fine-grained locking. It
> also extend API with functions that are needed to update existing
> actions for parallel execution.
> 
> Outline of changes:
> - Change tc action to use atomic reference and bind counters, rcu
>    mechanism for cookie update.
> - Extend action ops API with 'delete' function and 'unlocked' flag.
> - Change action API to work with actions in lockless manner based on
>    primitives implemented in previous patches.
> - Extend action API with new functions necessary to implement unlocked
>    actions.

Please run all the tdc tests with these changes. This area has almost
good test coverage at this point. If you need help just ping me.

cheers,
jamal