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[RFC,v4,12/19] batman-adv: Add hop_penalty mesh genl configuration

Message ID 20190119155626.6414-13-sven@narfation.org
State RFC, archived
Delegated to: Simon Wunderlich
Headers show
Series batman-adv: netlink restructuring, part 2 | expand

Commit Message

Sven Eckelmann Jan. 19, 2019, 3:56 p.m. UTC
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.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
Cc: Linus L├╝ssing <linus.luessing@c0d3.blue>
Cc: Marek Lindner <mareklindner@neomailbox.ch>
Cc: Antonio Quartulli <a@unstable.cc>
Cc: Simon Wunderlich <sw@simonwunderlich.de>
---
 include/uapi/linux/batman_adv.h |  6 ++++++
 net/batman-adv/netlink.c        | 11 +++++++++++
 2 files changed, 17 insertions(+)
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Patch

diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h
index 165272be..b37cb923 100644
--- a/include/uapi/linux/batman_adv.h
+++ b/include/uapi/linux/batman_adv.h
@@ -443,6 +443,12 @@  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 8db3a2a4..8602129f 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 },
 };
 
 /**
@@ -330,6 +331,10 @@  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;
+
 	if (primary_if)
 		batadv_hardif_put(primary_if);
 
@@ -536,6 +541,12 @@  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;