[PATCH RFC batadv 04/12] batman-adv: tt: extract refresh of existing local entries

The handling of a client which is already part of the local translation
table is independent from the rest of batadv_tt_local_add(): it only
refreshes last_seen and evaluates the PENDING and ROAM flags of the entry
which was just looked up.

Move it to batadv_tt_local_add_existing(). It reports via its return value
whether the client has to be announced to the mesh again and whether the
client roamed back to its original location.

Signed-off-by: Sven Eckelmann <[email protected]>
---
 net/batman-adv/translation-table.c | 78 +++++++++++++++++++++++++-------------
 1 file changed, 51 insertions(+), 27 deletions(-)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 5405be65..ca9956be 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -772,6 +772,55 @@ static bool batadv_tt_iif_is_wifi(struct net *net, int ifindex)
 	return batadv_is_wifi(wifi_flags);
 }
 
+/**
+ * batadv_tt_local_add_existing() - refresh an already known local TT entry
+ * @bat_priv: the bat priv with all the mesh interface information
+ * @tt_local: the local TT entry which was found in the local table
+ * @roamed_back: set to true when the client returned to its original location
+ *
+ * Return: true when the client has to be announced to the mesh again, false
+ * otherwise.
+ */
+static bool batadv_tt_local_add_existing(struct batadv_priv *bat_priv,
+					 struct batadv_tt_local_entry *tt_local,
+					 bool *roamed_back)
+{
+	struct batadv_tt_common_entry *common = &tt_local->common;
+
+	tt_local->last_seen = jiffies;
+
+	scoped_guard(spinlock_bh, &common->flags_lock) {
+		if (common->flags & BATADV_TT_CLIENT_PENDING) {
+			batadv_dbg(BATADV_DBG_TT, bat_priv,
+				   "Re-adding pending client %pM (vid: %d)\n",
+				   common->addr, batadv_print_vid(common->vid));
+			/* whatever the reason why the PENDING flag was set,
+			 * this is a client which was enqueued to be removed in
+			 * this orig_interval. Since it popped up again, the
+			 * flag can be reset like it was never enqueued
+			 */
+			common->flags &= ~BATADV_TT_CLIENT_PENDING;
+
+			return true;
+		}
+
+		if (common->flags & BATADV_TT_CLIENT_ROAM) {
+			batadv_dbg(BATADV_DBG_TT, bat_priv,
+				   "Roaming client %pM (vid: %d) came back to its original location\n",
+				   common->addr, batadv_print_vid(common->vid));
+			/* the ROAM flag is set because this client roamed away
+			 * and the node got a roaming_advertisement message. Now
+			 * that the client popped up again at its original
+			 * location such flag can be unset
+			 */
+			common->flags &= ~BATADV_TT_CLIENT_ROAM;
+			*roamed_back = true;
+		}
+	}
+
+	return false;
+}
+
 /**
  * batadv_tt_local_create() - allocate and initialize a local TT entry
  * @mesh_iface: netdev struct of the mesh interface
@@ -886,33 +935,8 @@ bool batadv_tt_local_add(struct net_device *mesh_iface, const u8 *addr,
 		tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 
 	if (tt_local) {
-		tt_local->last_seen = jiffies;
-
-		spin_lock_bh(&tt_local->common.flags_lock);
-		if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
-			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "Re-adding pending client %pM (vid: %d)\n",
-				   addr, batadv_print_vid(vid));
-			/* whatever the reason why the PENDING flag was set,
-			 * this is a client which was enqueued to be removed in
-			 * this orig_interval. Since it popped up again, the
-			 * flag can be reset like it was never enqueued
-			 */
-			tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
-			added = true;
-		} else if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
-			batadv_dbg(BATADV_DBG_TT, bat_priv,
-				   "Roaming client %pM (vid: %d) came back to its original location\n",
-				   addr, batadv_print_vid(vid));
-			/* the ROAM flag is set because this client roamed away
-			 * and the node got a roaming_advertisement message. Now
-			 * that the client popped up again at its original
-			 * location such flag can be unset
-			 */
-			tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
-			roamed_back = true;
-		}
-		spin_unlock_bh(&tt_local->common.flags_lock);
+		added = batadv_tt_local_add_existing(bat_priv, tt_local,
+						     &roamed_back);
 	} else {
 		tt_local = batadv_tt_local_create(mesh_iface, addr, vid, iif_is_wifi);
 		if (!tt_local)

-- 
2.47.3