From 32e727449c792b689c2a06a8b4cc9fef6270c5a7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Linus=20L=C3=BCssing?= Date: Sat, 23 Mar 2019 05:47:41 +0100 Subject: batman-adv: Add multicast-to-unicast support for multiple targets MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit With this patch multicast packets with a limited number of destinations (current default: 16) will be split and transmitted by the originator as individual unicast transmissions. Wifi broadcasts with their low bitrate are still a costly undertaking. In a mesh network this cost multiplies with the overall size of the mesh network. Therefore using multiple unicast transmissions instead of broadcast flooding is almost always less burdensome for the mesh network. The maximum amount of unicast packets can be configured via the newly introduced multicast_fanout parameter. If this limit is exceeded distribution will fall back to classic broadcast flooding. The multicast-to-unicast conversion is performed on the initial multicast sender node and counts on a final destination node, mesh-wide basis (and not next hop, neighbor node basis). Signed-off-by: Linus Lüssing Signed-off-by: Sven Eckelmann Signed-off-by: Simon Wunderlich --- include/uapi/linux/batman_adv.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h index e53f2b5e7ee7..67f4636758af 100644 --- a/include/uapi/linux/batman_adv.h +++ b/include/uapi/linux/batman_adv.h @@ -473,6 +473,13 @@ enum batadv_nl_attrs { */ BATADV_ATTR_THROUGHPUT_OVERRIDE, + /** + * @BATADV_ATTR_MULTICAST_FANOUT: defines the maximum number of packet + * copies that may be generated for a multicast-to-unicast conversion. + * Once this limit is exceeded distribution will fall back to broadcast. + */ + BATADV_ATTR_MULTICAST_FANOUT, + /* add attributes above here, update the policy in netlink.c */ /** -- cgit v1.2.3