netdev - Re: [RFC PATCH v2 net-next 0/3] flow_offload: Re-add per-action statistics

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Date:   Mon, 20 May 2019 11:40:51 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Edward Cree <ecree@...arflare.com>,
        Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Jiri Pirko <jiri@...nulli.us>, David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Michael Chan <michael.chan@...adcom.com>,
        Vishal Kulkarni <vishal@...lsio.com>
Subject: Re: [RFC PATCH v2 net-next 0/3] flow_offload: Re-add per-action
 statistics

On 2019-05-20 11:37 a.m., Edward Cree wrote:
> On 19/05/2019 01:22, Pablo Neira Ayuso wrote:
>> On Fri, May 17, 2019 at 04:27:29PM +0100, Edward Cree wrote:

> Thanks.  Looking at net/netfilter/nfnetlink_acct.c, it looks as though you
>   don't have a u32 index in there; for the cookie approach, would the
>   address of the struct nf_acct (casted to unsigned long) work to uniquely
>   identify actions that should be shared?
> I'm not 100% sure how nf (or nfacct) offload is going to look, so I might
>   be barking up the wrong tree here.  But it seems like the cookie method
>   should work better for you — even if you did have an index, how would you
>   avoid collisions with TC actions using the same indices if both are in
>   use on a box?  Cookies OTOH are pointers, so guaranteed unique :)

A little concerned:
Hopefully all these can be manipulated by tc as well - otherwise we are
opening some other big pandora box of two subsystems fighting each
other.

cheers,
jamal