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

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Date:   Mon, 5 Jun 2017 17:46:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jiri Pirko <jiri@...nulli.us>
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

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
interface?  How do you avoid Linux processing it? If enp3s0np19 is a
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?

Thanks
      Andrew