netdev - Re: [patch net-next 09/20] net: sched: convert actions array into rcu list

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Date:   Mon, 31 Jul 2017 14:07:13 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Daniel Borkmann <daniel@...earbox.net>, mlxsw@...lanox.com
Subject: Re: [patch net-next 09/20] net: sched: convert actions array into rcu list

On Fri, Jul 28, 2017 at 7:40 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> From: Jiri Pirko <jiri@...lanox.com>
>
> Currently the actions are stored in array with array size. To traverse
> this array in fastpath, tcf_tree_lock is taken to protect it. Convert
> the array into a singly linked list, similar to the filter chains style
> and allow traversal protected by rcu.

Did you read commit 22dc13c837c33207548c8ee5116 ?

An action can't be shared by multiple filters if you put them
in a list (no matter singly or double), this is why I use pointers.