From d353d8d4d9f0184ac43a90c6e04b593c33bd28ea Mon Sep 17 00:00:00 2001 From: Martin Hundebøll Date: Fri, 25 Jan 2013 11:12:38 +0100 Subject: batman-adv: network coding - add the initial infrastructure code MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll Signed-off-by: Marek Lindner Signed-off-by: Antonio Quartulli --- net/batman-adv/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'net/batman-adv/Kconfig') diff --git a/net/batman-adv/Kconfig b/net/batman-adv/Kconfig index 8d8afb134b3a..fa780b76630e 100644 --- a/net/batman-adv/Kconfig +++ b/net/batman-adv/Kconfig @@ -36,6 +36,20 @@ config BATMAN_ADV_DAT mesh networks. If you think that your network does not need this option you can safely remove it and save some space. +config BATMAN_ADV_NC + bool "Network Coding" + depends on BATMAN_ADV + default n + help + This option enables network coding, a mechanism that aims to + increase the overall network throughput by fusing multiple + packets in one transmission. + Note that interfaces controlled by batman-adv must be manually + configured to have promiscuous mode enabled in order to make + network coding work. + If you think that your network does not need this feature you + can safely disable it and save some space. + config BATMAN_ADV_DEBUG bool "B.A.T.M.A.N. debugging" depends on BATMAN_ADV -- cgit v1.2.3