The mesh interface can use (in an homogeneous mesh) network coding, a mechanism that aims to increase the overall network throughput by fusing multiple packets in one transmission.
The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the configuration of this feature using the BATADV_ATTR_NETWORK_CODING_ENABLED attribute. Setting the u8 to zero will disable this feature and setting it to something else is enabling this feature.
Signed-off-by: Sven Eckelmann sven@narfation.org --- Cc: Martin Hundeboll martin@hundeboll.net Cc: Marek Lindner mareklindner@neomailbox.ch --- include/uapi/linux/batman_adv.h | 7 +++++++ net/batman-adv/netlink.c | 17 +++++++++++++++++ 2 files changed, 24 insertions(+)
diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h index 38caaaae..a4239c14 100644 --- a/include/uapi/linux/batman_adv.h +++ b/include/uapi/linux/batman_adv.h @@ -464,6 +464,13 @@ enum batadv_nl_attrs { */ BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED,
+ /** + * @BATADV_ATTR_NETWORK_CODING_ENABLED: whether Network Coding (using + * some magic to send fewer wifi packets but still the same content) is + * enabled or not. + */ + BATADV_ATTR_NETWORK_CODING_ENABLED, + /* add attributes above here, update the policy in netlink.c */
/** diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c index 475bd15f..6f01f92e 100644 --- a/net/batman-adv/netlink.c +++ b/net/batman-adv/netlink.c @@ -55,6 +55,7 @@ #include "hard-interface.h" #include "log.h" #include "multicast.h" +#include "network-coding.h" #include "originator.h" #include "soft-interface.h" #include "tp_meter.h" @@ -156,6 +157,7 @@ static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = { [BATADV_ATTR_HOP_PENALTY] = { .type = NLA_U8 }, [BATADV_ATTR_LOG_LEVEL] = { .type = NLA_U32 }, [BATADV_ATTR_MULTICAST_FORCEFLOOD_ENABLED] = { .type = NLA_U8 }, + [BATADV_ATTR_NETWORK_CODING_ENABLED] = { .type = NLA_U8 }, };
/** @@ -350,6 +352,12 @@ static int batadv_netlink_mesh_fill(struct sk_buff *msg, goto nla_put_failure; #endif /* CONFIG_BATMAN_ADV_MCAST */
+#ifdef CONFIG_BATMAN_ADV_NC + if (nla_put_u8(msg, BATADV_ATTR_NETWORK_CODING_ENABLED, + !!atomic_read(&bat_priv->network_coding))) + goto nla_put_failure; +#endif /* CONFIG_BATMAN_ADV_NC */ + if (primary_if) batadv_hardif_put(primary_if);
@@ -579,6 +587,15 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info) } #endif /* CONFIG_BATMAN_ADV_MCAST */
+#ifdef CONFIG_BATMAN_ADV_NC + if (info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]) { + attr = info->attrs[BATADV_ATTR_NETWORK_CODING_ENABLED]; + + atomic_set(&bat_priv->network_coding, !!nla_get_u8(attr)); + batadv_nc_status_update(bat_priv->soft_iface); + } +#endif /* CONFIG_BATMAN_ADV_NC */ + batadv_netlink_notify_mesh(bat_priv);
return 0;