netdev - Re: [PATCH 0/2] netem: trace enhancement

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Message-ID: <475D4DEE.2080308@ee.ethz.ch>
Date:	Mon, 10 Dec 2007 15:32:14 +0100
From:	Ariane Keller <ariane.keller@....ee.ethz.ch>
To:	Patrick McHardy <kaber@...sh.net>
CC:	Ariane Keller <ariane.keller@....ee.ethz.ch>,
	Ben Greear <greearb@...delatech.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org, herbert@...dor.apana.org.au,
	Rainer Baumann <baumann@....ee.ethz.ch>
Subject: Re: [PATCH 0/2] netem: trace enhancement

I finally managed to rewrite the netem trace extension to use rtnetlink 
communication for the data transfer for user space to kernel space.

The kernel patch is available here:
http://www.tcn.hypert.net/tcn_kernel_2_6_23_rtnetlink

and the iproute patch is here:
http://www.tcn.hypert.net/tcn_iproute2_2_6_23_rtnetlink

Whenever new data is needed the kernel module sends a notification to 
the user space process. Thereupon the user space process sends a data 
package to the kernel module.
I had to write a new qdisc_notify function (qdisc_notify_pid) since the 
other was acquiring a lock, which we already hold in this situation.

I hope everything works as expected and I'm looking forward for your 
comments.

Thanks!
Ariane
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