[RFC v2 17/19] batman-adv: Add elp_interval hardif genl configuration

[Sven Eckelmann]

The ELP packets are transmitted every elp_interval milliseconds on an
slave/hard-interface. This value can be changed using the configuration
interface.

The BATADV_CMD_SET_HARDIF/BATADV_CMD_GET_HARDIF commands allow to set/get
the configuration of this feature using the u32 BATADV_ATTR_ELP_INTERVAL
attribute.

Cc: Jiri Pirko <j...@mellanox.com>
Signed-off-by: Sven Eckelmann <s...@narfation.org>
---
 include/uapi/linux/batman_adv.h |  6 ++++++
 net/batman-adv/netlink.c        | 17 +++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h
index f8661657..a4ab6bda 100644
--- a/include/uapi/linux/batman_adv.h
+++ b/include/uapi/linux/batman_adv.h
@@ -475,6 +475,12 @@ enum batadv_nl_attrs {
         */
        BATADV_ATTR_ORIG_INTERVAL,
 
+       /**
+        * @BATADV_ATTR_ELP_INTERVAL: defines the interval in milliseconds in
+        *  which batman emits probing packets for neighbor sensing (ELP).
+        */
+       BATADV_ATTR_ELP_INTERVAL,
+
        /* 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 61a3e6f1..70ab010e 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -159,6 +159,7 @@ static const struct nla_policy 
batadv_netlink_policy[NUM_BATADV_ATTR] = {
        [BATADV_ATTR_MULTICAST_MODE]            = { .type = NLA_U8 },
        [BATADV_ATTR_NETWORK_CODING]            = { .type = NLA_U8 },
        [BATADV_ATTR_ORIG_INTERVAL]             = { .type = NLA_U32 },
+       [BATADV_ATTR_ELP_INTERVAL]              = { .type = NLA_U32 },
 };
 
 /**
@@ -823,6 +824,12 @@ static int batadv_netlink_hardif_put(struct sk_buff *msg,
                        goto nla_put_failure;
        }
 
+#ifdef CONFIG_BATMAN_ADV_BATMAN_V
+       if (nla_put_u32(msg, BATADV_ATTR_ELP_INTERVAL,
+                       atomic_read(&hard_iface->bat_v.elp_interval)))
+               goto nla_put_failure;
+#endif /* CONFIG_BATMAN_ADV_BATMAN_V */
+
        genlmsg_end(msg, hdr);
        return 0;
 
@@ -908,6 +915,16 @@ static int batadv_netlink_set_hardif(struct sk_buff *skb,
        struct batadv_hard_iface *hard_iface = info->user_ptr[1];
        struct batadv_priv *bat_priv = info->user_ptr[0];
 
+#ifdef CONFIG_BATMAN_ADV_BATMAN_V
+       struct nlattr *attr;
+
+       if (info->attrs[BATADV_ATTR_ELP_INTERVAL]) {
+               attr = info->attrs[BATADV_ATTR_ELP_INTERVAL];
+
+               atomic_set(&hard_iface->bat_v.elp_interval, nla_get_u32(attr));
+       }
+#endif /* CONFIG_BATMAN_ADV_BATMAN_V */
+
        batadv_netlink_notify_hardif(bat_priv, hard_iface);
 
        return 0;
-- 
2.19.1