[RFC v2 07/19] batman-adv: Add bonding mesh genl configuration

[Sven Eckelmann]

The mesh interface can use multiple slave/hard-interface ports at the same
time to transport the traffic to other nodes.

The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the
configuration of this feature using the BATADV_ATTR_BONDING attribute.
Setting the u8 to zero will disable this feature and setting it to
something else is enabling this feature.

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        | 11 +++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h
index 75738032..d209c468 100644
--- a/include/uapi/linux/batman_adv.h
+++ b/include/uapi/linux/batman_adv.h
@@ -374,6 +374,12 @@ enum batadv_nl_attrs {
         */
        BATADV_ATTR_ISOLATION_MASK,
 
+       /**
+        * @BATADV_ATTR_BONDING: whether the data traffic going through the
+        *  mesh will be sent using multiple interfaces at the same time.
+        */
+       BATADV_ATTR_BONDING,
+
        /* 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 217c4b30..a836a8f1 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -143,6 +143,7 @@ static const struct nla_policy 
batadv_netlink_policy[NUM_BATADV_ATTR] = {
        [BATADV_ATTR_AP_ISOLATION]              = { .type = NLA_U8 },
        [BATADV_ATTR_ISOLATION_MARK]            = { .type = NLA_U32 },
        [BATADV_ATTR_ISOLATION_MASK]            = { .type = NLA_U32 },
+       [BATADV_ATTR_BONDING]                   = { .type = NLA_U8 },
 };
 
 /**
@@ -278,6 +279,10 @@ static int batadv_netlink_mesh_put(struct sk_buff *msg,
                        bat_priv->isolation_mark_mask))
                goto nla_put_failure;
 
+       if (nla_put_u8(msg, BATADV_ATTR_BONDING,
+                      !!atomic_read(&bat_priv->bonding)))
+               goto nla_put_failure;
+
        batadv_hardif_put(primary_if);
 
        genlmsg_end(msg, hdr);
@@ -385,6 +390,12 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, 
struct genl_info *info)
                bat_priv->isolation_mark_mask = nla_get_u32(attr);
        }
 
+       if (info->attrs[BATADV_ATTR_BONDING]) {
+               attr = info->attrs[BATADV_ATTR_BONDING];
+
+               atomic_set(&bat_priv->bonding, !!nla_get_u8(attr));
+       }
+
        batadv_netlink_notify_mesh(bat_priv);
 
        return 0;
-- 
2.19.1