netdev - Re: [PATCH v3 net-next 1/1] net_sched: Introduce skbmod action

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Message-ID: <b117fac2-c73f-2d42-3843-52f9717224d9@mojatatu.com>
Date:   Mon, 29 Aug 2016 07:35:46 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, daniel@...earbox.net,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH v3 net-next 1/1] net_sched: Introduce skbmod action

On 16-08-29 06:38 AM, Jamal Hadi Salim wrote:
> Let me see if i can
> try something. Trickery with RCU is not one of my virtues -
> so i may get it wrong but hope you can comment.

Something like attached? Compile tested.
I tried to emulate gact - but greping around I havent
seen sample code which uses  rcu_read_un/lock + synchronize_rcu
this way
[so be gentle if i got it wrong ;->]

I am not sure where Cong is going but probably introducing
a rcu head in each policy will allow to swap and free old one
with call_rcu may be a better approach. The cost may come in
slowing down replace operations.

cheers,
jamal

View attachment "skbmod-rcu-maybe" of type "text/plain" (2894 bytes)