netdev - Re: [patch net-next RFC 0/4] net: sched: allow qdiscs to share filter block instances

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Date:   Tue, 11 Jul 2017 09:02:46 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Or Gerlitz <gerlitz.or@...il.com>
Cc:     Linux Netdev List <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jiri Benc <jbenc@...hat.com>, mlxsw <mlxsw@...lanox.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Roman Mashak <mrv@...atatu.com>,
        Paul Blakey <paulb@...lanox.com>,
        Mark Bloch <markb@...lanox.com>
Subject: Re: [patch net-next RFC 0/4] net: sched: allow qdiscs to share
 filter block instances

Tue, Jul 11, 2017 at 08:57:30AM CEST, gerlitz.or@...il.com wrote:
>On Mon, Jul 10, 2017 at 9:51 PM, Jiri Pirko <jiri@...nulli.us> wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>>
>> Currently the filters added to qdiscs are independent. So for example if you
>> have 2 netdevices and you create ingress qdisc on both and you want to add
>> identical filter rules both, you need to add them twice. This patchset
>> makes this easier and mainly saves resources allowing to share all filters
>> within a qdisc - I call it a "filter block". Also this helps to save
>> resources when we do offload to hw for example to expensive TCAM.
>
>[...]
>
>
>> Now we can add filter to any of qdiscs sharing the same block:
>> $ tc filter add dev ens7 parent ffff: protocol ip pref 25 flower dst_ip 192.168.0.0/16 action drop
>
>> We will see the same output if we list filters for ens7 and ens8, including stats:
>
>yeah, but the stats belong to the action, not the filter, right? so you create
>here actually a shared action? or you also introduced in that series stats
>for filters, I am confused...

Filters are shared along with all that belongs to them, so including
actions.