netdev - Re: [patch net-next 0/6] introduce trap control action to tc and offload it

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Message-ID: <20170605195612.GB1986@nanopsycho>
Date:   Mon, 5 Jun 2017 21:56:12 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, jhs@...atatu.com,
        xiyou.wangcong@...il.com, edumazet@...gle.com,
        alexander.h.duyck@...el.com, stephen@...workplumber.org,
        daniel@...earbox.net, mlxsw@...lanox.com
Subject: Re: [patch net-next 0/6] introduce trap control action to tc and
 offload it

Mon, Jun 05, 2017 at 09:43:17PM CEST, jiri@...nulli.us wrote:
>Mon, Jun 05, 2017 at 05:46:51PM CEST, andrew@...n.ch wrote:
>>On Mon, Jun 05, 2017 at 04:38:26PM +0200, Jiri Pirko wrote:
>>> From: Jiri Pirko <jiri@...lanox.com>
>>> 
>>> This patchset introduces a control action dedicated to indicate
>>> to trap the matched packet to CPU. This is specific action for
>>> HW offloads. Also, the patchset offloads the action to mlxsw driver.
>>> 
>>> Example usage:
>>> $ tc filter add dev enp3s0np19 parent ffff: protocol ip prio 20 flower skip_sw dst_ip 192.168.10.1 action trap
>>
>>Hi Jiri
>>
>>So i assume this means a frame ingressing on the switch port
>>enp3s0np19 matching the filter is now visible on the linux enp3s0np19
>
>Yes.
>
>
>>interface?  How do you avoid Linux processing it? If enp3s0np19 is a
>
>On contrary. I want Linux to process it. The packet was stolen from the
>offloaded fastpath to kernel.
>
>
>>member of a bridge, we don't want the software bridge processing it
>>and forwarding it out another port, since i assume the hardware has
>>already done this. Or does the trap stop further processing of the
>>frame by the hardware?
>
>Exactly the latter :) Thanks!

Btw, if you would like to just sample the traffic and not really
influence it in any way, there is a special action "sample" for that.
mlxsw offloads that.