[RFC v2 12/19] batman-adv: Add hop_penalty mesh genl configuration
From: Sven Eckelmann <hidden>
Date: 2018-11-23 16:13:52
Also in:
batman
Subsystem:
batman advanced, the rest · Maintainers:
Marek Lindner, Simon Wunderlich, Antonio Quartulli, Sven Eckelmann, Linus Torvalds
The TQ (B.A.T.M.A.N. IV) and throughput values (B.A.T.M.A.N. V) are reduced when they are forwarded. One of the reductions is the penalty for traversing an additional hop. This hop_penalty (0-255) defines the percentage of reduction (0-100%). The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the configuration of this feature using the u8 BATADV_ATTR_HOP_PENALTY attribute. Cc: Jiri Pirko <jiri-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> Signed-off-by: Sven Eckelmann <redacted> --- include/uapi/linux/batman_adv.h | 6 ++++++ net/batman-adv/netlink.c | 11 +++++++++++ 2 files changed, 17 insertions(+)
diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h
index e9c48dbd..b6d0eaf6 100644
--- a/include/uapi/linux/batman_adv.h
+++ b/include/uapi/linux/batman_adv.h@@ -442,6 +442,12 @@ enum batadv_nl_attrs { */ BATADV_ATTR_GW_SEL_CLASS, + /** + * @BATADV_ATTR_HOP_PENALTY: defines the penalty which will be applied + * to an originator message's tq-field on every hop. + */ + BATADV_ATTR_HOP_PENALTY, + /* 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 4e806e48..4d3a23df 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c@@ -152,6 +152,7 @@ static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = { [BATADV_ATTR_GW_BANDWIDTH_UP] = { .type = NLA_U32 }, [BATADV_ATTR_GW_MODE] = { .type = NLA_U8 }, [BATADV_ATTR_GW_SEL_CLASS] = { .type = NLA_U32 }, + [BATADV_ATTR_HOP_PENALTY] = { .type = NLA_U8 }, }; /**
@@ -329,6 +330,10 @@ static int batadv_netlink_mesh_put(struct sk_buff *msg, goto nla_put_failure; } + if (nla_put_u8(msg, BATADV_ATTR_HOP_PENALTY, + atomic_read(&bat_priv->hop_penalty))) + goto nla_put_failure; + batadv_hardif_put(primary_if); genlmsg_end(msg, hdr);
@@ -534,6 +539,12 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info) } } + if (info->attrs[BATADV_ATTR_HOP_PENALTY]) { + attr = info->attrs[BATADV_ATTR_HOP_PENALTY]; + + atomic_set(&bat_priv->hop_penalty, nla_get_u8(attr)); + } + batadv_netlink_notify_mesh(bat_priv); return 0;
--
2.19.1