From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [RFC PATCH 1/4] net: port mirroring: add tracepoints to appropriate network paths Date: Tue, 15 Dec 2009 13:50:53 -0800 Message-ID: <20091215135053.345787b1@nehalam> References: <20091215162956.GB18710@hmsreliant.think-freely.org> <20091215163604.GC18710@hmsreliant.think-freely.org> <20091215084424.291459cb@s6510> <20091215170249.GB20644@hmsreliant.think-freely.org> <20091215092222.1cbbee0f@nehalam> <20091215174956.GC20644@hmsreliant.think-freely.org> <20091215095406.135fadbb@s6510> <20091215204155.GD20644@hmsreliant.think-freely.org> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, davem@davemloft.net To: Neil Horman Return-path: Received: from mail.vyatta.com ([76.74.103.46]:42337 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760335AbZLOVvF (ORCPT ); Tue, 15 Dec 2009 16:51:05 -0500 In-Reply-To: <20091215204155.GD20644@hmsreliant.think-freely.org> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 15 Dec 2009 15:41:55 -0500 Neil Horman wrote: > On Tue, Dec 15, 2009 at 09:54:06AM -0800, Stephen Hemminger wrote: > > On Tue, 15 Dec 2009 12:49:56 -0500 > > Neil Horman wrote: > > > > > On Tue, Dec 15, 2009 at 09:22:22AM -0800, Stephen Hemminger wrote: > > > > On Tue, 15 Dec 2009 12:02:49 -0500 > > > > Neil Horman wrote: > > > > > > > > > On Tue, Dec 15, 2009 at 08:44:24AM -0800, Stephen Hemminger wrote: > > > > > > On Tue, 15 Dec 2009 11:36:04 -0500 > > > > > > Neil Horman 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. > > > > > > > > > > > I wish that had been easier to find. That only appears to mirror inbound frames > > > > > though, what about outbound frames? can you attach mirred to an outbound qdisc? > > > > > > > > It works for outbound frames as well. > > > *Sigh*, well there goes a weeks worth of tinkering. Stupid of me. Rescinded > > > Thanks > > > Neil > > > > The tracepoints are still useful, and all is not wasted. > Yeah, but it would be nice to have a recognized feature to go with them, so we > don't just have random tracepoints laying about. Can you think of a good > alternative use for them? > Regards > Neil > Harald had some stuff with tracking packets through the system that seems like a natural for using tracepoints. --