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

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Date:   Tue, 15 May 2018 10:20:43 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Vlad Buslov <vladbu@...lanox.com>, netdev@...r.kernel.org,
        davem@...emloft.net, xiyou.wangcong@...il.com, 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

Mon, May 14, 2018 at 08:03:20PM CEST, jhs@...atatu.com wrote:
>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.

Oh, that reminds me. Vlad, please run also:
tools/testing/selftests/net/forwarding/tc_*

Thanks!