Subject: Re: [RFC PATCH 1/4] net: port mirroring: add tracepoints to appropriate network paths

From: Stephen Hemminger <[email-masked]>
Date: Tue, 15 Dec 2009 08:44:24 -0800

On Tue, 15 Dec 2009 11:36:04 -0500
Neil Horman <[email-masked]> wrote:

> Add net_dev_xmit & net_dev_receive tracepoints
> 
> Add tracepoints at the end of the network stack xmit path and the start of the
> stack receive path.  Among other uses, these tracepoints can be used to tap the
> raw input and output streams for any given network device for the purposes of
> mirroring that traffic to other ports.
> 

There already is a mirroring solution but people don't know how to use it.
Using mirred on ingress qdisc does that.

Why would we want to add another hook to the already complex networking
code path?

https://svn.openfabrics.org/svn/openib/gen2/branches/1.1/src/userspace/ipoibtools/iproute2/doc/actions/mirred-usage