netdev - Re: [RFC PATCH 3/4] net: port mirroring: add config options to enable port mirroring

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Message-ID: <20091215163840.GE18710@hmsreliant.think-freely.org>
Date:	Tue, 15 Dec 2009 11:38:40 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net
Subject: Re: [RFC PATCH 3/4] net: port mirroring: add config options to
	enable port mirroring

Add configuration to enable port mirroring feature.

Signed-off-by: Neil Horman <nhorman@...driver.com>


 Kconfig       |   14 ++++++++++++++
 core/Makefile |    1 +
 2 files changed, 15 insertions(+)

diff --git a/net/Kconfig b/net/Kconfig
index 041c35e..b94f950 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -246,6 +246,20 @@ config NET_DROP_MONITOR
 	just checking the various proc files and other utilities for
 	drop statistics, say N here.
 
+config NET_PORT_MIRRORING
+	boolean "Network port mirroring"
+	depends on EXPERIMENTAL && TRACEPOINTS
+	---help---
+	When debugging network connectivity problems, it can be useful (and
+	sometimes necessecary) to record frames from an interface without using
+	any of the systems under test (e.g. if running a capture on the system
+	in question affects it in such a way that the problem then cannot be 
+	reproduced).  Port mirroring allows for the traffic to and from a given
+	port to be resent unaltered to a secondary port, so that a tertiary
+	system can record the traffic).  If you need to be able to see monitor
+	network traffic to/from a system without running software on the system
+	in question, say Y here.
+
 endmenu
 
 endmenu
diff --git a/net/core/Makefile b/net/core/Makefile
index 08791ac..305d88d 100644
--- a/net/core/Makefile
+++ b/net/core/Makefile
@@ -18,4 +18,5 @@ obj-$(CONFIG_NET_DMA) += user_dma.o
 obj-$(CONFIG_FIB_RULES) += fib_rules.o
 obj-$(CONFIG_TRACEPOINTS) += net-traces.o
 obj-$(CONFIG_NET_DROP_MONITOR) += drop_monitor.o
+obj-$(CONFIG_NET_PORT_MIRRORING) += mirror.o
 
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