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batman-adv: Add hop_penalty mesh genl configuration

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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>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2018-11-23 13:19:38 +01:00 committed by Simon Wunderlich
parent e2d0d35b5b
commit bfc7f1be57
2 changed files with 17 additions and 0 deletions
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6
include/uapi/linux/batman_adv.h
View file

@ -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 */
/**

11
net/batman-adv/netlink.c
View file

@ -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;