[09/19] batman-adv: make the GW selection class algorithm specific

diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
index 0366cbf..90fd5ee 100644
--- a/net/batman-adv/bat_v.c
+++ b/net/batman-adv/bat_v.c
@@ -21,8 +21,10 @@ 
 #include <linux/atomic.h>
 #include <linux/bug.h>
 #include <linux/cache.h>
+#include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/jiffies.h>
+#include <linux/kernel.h>
 #include <linux/netdevice.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
@@ -34,6 +36,8 @@ 
 #include "bat_algo.h"
 #include "bat_v_elp.h"
 #include "bat_v_ogm.h"
+#include "gateway_client.h"
+#include "gateway_common.h"
 #include "hard-interface.h"
 #include "hash.h"
 #include "originator.h"
@@ -320,6 +324,32 @@  err_ifinfo1:
 	return ret;
 }
 
+static ssize_t batadv_v_store_sel_class(struct batadv_priv *bat_priv,
+					char *buff, size_t count)
+{
+	u32 old_class, class;
+
+	if (!batadv_parse_throughput(bat_priv->soft_iface, buff,
+				     "B.A.T.M.A.N. V GW selection class",
+				     &class))
+		return -EINVAL;
+
+	old_class = atomic_read(&bat_priv->gw.sel_class);
+	atomic_set(&bat_priv->gw.sel_class, class);
+
+	if (old_class != class)
+		batadv_gw_reselect(bat_priv);
+
+	return count;
+}
+
+static ssize_t batadv_v_show_sel_class(struct batadv_priv *bat_priv, char *buff)
+{
+	u32 class = atomic_read(&bat_priv->gw.sel_class);
+
+	return sprintf(buff, "%u.%u MBit\n", class / 10, class % 10);
+}
+
 static struct batadv_algo_ops batadv_batman_v __read_mostly = {
 	.name = "BATMAN_V",
 	.iface = {
@@ -338,6 +368,10 @@  static struct batadv_algo_ops batadv_batman_v __read_mostly = {
 	.orig = {
 		.print = batadv_v_orig_print,
 	},
+	.gw = {
+		.store_sel_class = batadv_v_store_sel_class,
+		.show_sel_class = batadv_v_show_sel_class,
+	},
 };
 
 /**
diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c
index 4e06cb7..e78bd7f 100644
--- a/net/batman-adv/sysfs.c
+++ b/net/batman-adv/sysfs.c
@@ -515,6 +515,36 @@  static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 	return count;
 }
 
+static ssize_t batadv_show_gw_sel_class(struct kobject *kobj,
+					struct attribute *attr, char *buff)
+{
+	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
+
+	if (bat_priv->algo_ops->gw.show_sel_class)
+		return bat_priv->algo_ops->gw.show_sel_class(bat_priv, buff);
+
+	return sprintf(buff, "%i\n", atomic_read(&bat_priv->gw.sel_class));
+}
+
+static ssize_t batadv_store_gw_sel_class(struct kobject *kobj,
+					 struct attribute *attr, char *buff,
+					 size_t count)
+{
+	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
+
+	if (buff[count - 1] == '\n')
+		buff[count - 1] = '\0';
+
+	if (bat_priv->algo_ops->gw.store_sel_class)
+		return bat_priv->algo_ops->gw.store_sel_class(bat_priv, buff,
+							      count);
+
+	return __batadv_store_uint_attr(buff, count, 1, BATADV_TQ_MAX_VALUE,
+					batadv_post_gw_reselect, attr,
+					&bat_priv->gw.sel_class,
+					bat_priv->soft_iface);
+}
+
 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 				     struct attribute *attr, char *buff)
 {
@@ -626,8 +656,8 @@  BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, S_IRUGO | S_IWUSR,
 		     2 * BATADV_JITTER, INT_MAX, NULL);
 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, S_IRUGO | S_IWUSR, 0,
 		     BATADV_TQ_MAX_VALUE, NULL);
-BATADV_ATTR_SIF_UINT(gw_sel_class, gw.sel_class, S_IRUGO | S_IWUSR, 1,
-		     BATADV_TQ_MAX_VALUE, batadv_post_gw_reselect);
+static BATADV_ATTR(gw_sel_class, S_IRUGO | S_IWUSR, batadv_show_gw_sel_class,
+		   batadv_store_gw_sel_class);
 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 		   batadv_store_gw_bwidth);
 #ifdef CONFIG_BATMAN_ADV_MCAST
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 96af6da..deaadba 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -1450,12 +1450,24 @@  struct batadv_algo_orig_ops {
 };
 
 /**
+ * struct batadv_algo_gw_ops - mesh algorithm callbacks (GW specific)
+ * @store_sel_class: parse and stores a new GW selection class (optional)
+ * @show_sel_class: prints the current GW selection class (optional)
+ */
+struct batadv_algo_gw_ops {
+	ssize_t (*store_sel_class)(struct batadv_priv *bat_priv, char *buff,
+				   size_t count);
+	ssize_t (*show_sel_class)(struct batadv_priv *bat_priv, char *buff);
+};
+
+/**
  * struct batadv_algo_ops - mesh algorithm callbacks
  * @list: list node for the batadv_algo_list
  * @name: name of the algorithm
  * @iface: callbacks related to interface handling
  * @neigh: callbacks related to neighbors handling
  * @orig: callbacks related to originators handling
+ * @gw: callbacks related to GW mode
  */
 struct batadv_algo_ops {
 	struct hlist_node list;
@@ -1463,6 +1475,7 @@  struct batadv_algo_ops {
 	struct batadv_algo_iface_ops iface;
 	struct batadv_algo_neigh_ops neigh;
 	struct batadv_algo_orig_ops orig;
+	struct batadv_algo_gw_ops gw;
 };
 
 /**