[B.A.T.M.A.N.] [RFC v4 13/19] batman-adv: Add log_level mesh genl configuration

[Sven Eckelmann]

In contrast to other modules, batman-adv allows to set the debug message
verbosity per mesh/soft-interface and not per module (via modparam).

The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the
configuration of this feature using the u32 (bitmask) BATADV_ATTR_LOG_LEVEL
attribute.

Signed-off-by: Sven Eckelmann <s...@narfation.org>
---
Cc: Marek Lindner <mareklind...@neomailbox.ch>
---
 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 b37cb923..6d36e4b4 100644
--- a/include/uapi/linux/batman_adv.h
+++ b/include/uapi/linux/batman_adv.h
@@ -449,6 +449,12 @@ enum batadv_nl_attrs {
         */
        BATADV_ATTR_HOP_PENALTY,
 
+       /**
+        * @BATADV_ATTR_LOG_LEVEL: bitmask with to define which debug messages
+        *  should be send to the debug log/trace ring buffer
+        */
+       BATADV_ATTR_LOG_LEVEL,
+
        /* 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 8602129f..d39f8f83 100644
--- a/net/batman-adv/netlink.c
+++ b/net/batman-adv/netlink.c
@@ -53,6 +53,7 @@
 #include "gateway_client.h"
 #include "gateway_common.h"
 #include "hard-interface.h"
+#include "log.h"
 #include "multicast.h"
 #include "originator.h"
 #include "soft-interface.h"
@@ -153,6 +154,7 @@ static const struct nla_policy 
batadv_netlink_policy[NUM_BATADV_ATTR] = {
        [BATADV_ATTR_GW_MODE]                   = { .type = NLA_U8 },
        [BATADV_ATTR_GW_SEL_CLASS]              = { .type = NLA_U32 },
        [BATADV_ATTR_HOP_PENALTY]               = { .type = NLA_U8 },
+       [BATADV_ATTR_LOG_LEVEL]                 = { .type = NLA_U32 },
 };
 
 /**
@@ -335,6 +337,12 @@ static int batadv_netlink_mesh_put(struct sk_buff *msg,
                       atomic_read(&bat_priv->hop_penalty)))
                goto nla_put_failure;
 
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+       if (nla_put_u32(msg, BATADV_ATTR_LOG_LEVEL,
+                       atomic_read(&bat_priv->log_level)))
+               goto nla_put_failure;
+#endif /* CONFIG_BATMAN_ADV_DEBUG */
+
        if (primary_if)
                batadv_hardif_put(primary_if);
 
@@ -547,6 +555,15 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, 
struct genl_info *info)
                atomic_set(&bat_priv->hop_penalty, nla_get_u8(attr));
        }
 
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+       if (info->attrs[BATADV_ATTR_LOG_LEVEL]) {
+               attr = info->attrs[BATADV_ATTR_LOG_LEVEL];
+
+               atomic_set(&bat_priv->log_level,
+                          nla_get_u32(attr) & BATADV_DBG_ALL);
+       }
+#endif /* CONFIG_BATMAN_ADV_DEBUG */
+
        batadv_netlink_notify_mesh(bat_priv);
 
        return 0;
-- 
2.20.1