netdev - Re: [RFC Patch net-next 0/6] net_sched: really switch to RCU for tc actions

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Date:   Fri, 2 Sep 2016 09:09:42 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, jhs@...atatu.com
Subject: Re: [RFC Patch net-next 0/6] net_sched: really switch to RCU for tc
 actions

Fri, Sep 02, 2016 at 07:57:14AM CEST, xiyou.wangcong@...il.com wrote:
>Currently there are only two tc actions lockless:
>gact and mirred. But they are questionable because
>we don't have anything to prevent a parallel update
>on an existing tc action in hash table while reading
>it on fast path, this could be a problem when a tc
>action becomes complex.
>
>This patchset introduces a few new tc action API's
>based on RCU so that the fast path could now really
>be protected by RCU and we can update existing tc
>actions safely and race-freely.
>
>Obviously this is still _not_ complete yet, I only
>modified mirred action to show the use case of
>the new API's, all the rest actions could switch to
>the new API's too. The new API's are a bit ugly too,
>any suggestion to improve them is welcome.
>
>I tested mirred action with a few test cases, so far
>so good, at least no obvious bugs. ;)


I wonder, do you happen to have a very tiny narrow screen?