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

Mon, Jun 05, 2017 at 05:46:51PM CEST, andrew@lunn.ch wrote:

On Mon, Jun 05, 2017 at 04:38:26PM +0200, Jiri Pirko wrote:

quoted

From: Jiri Pirko <redacted>

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!

Thanks
     Andrew