Commit bfc7f1be authored by Sven Eckelmann's avatar Sven Eckelmann Committed by Simon Wunderlich
Browse files

batman-adv: Add hop_penalty mesh genl configuration 



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: default avatarSven Eckelmann <sven@narfation.org>
Signed-off-by: default avatarSimon Wunderlich <sw@simonwunderlich.de>
parent e2d0d35b

include/uapi/linux/batman_adv.h

+6 −0
Original line number Diff line number Diff line
@@ -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 */



	/**

net/batman-adv/netlink.c

+11 −0
Original line number Diff line number Diff line
@@ -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_fill(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;

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