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Message-Id: <1303068618-27928-2-git-send-email-sven@narfation.org>
Date: Sun, 17 Apr 2011 21:30:11 +0200
From: Sven Eckelmann <sven@...fation.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
Linus Lüssing <linus.luessing@....de>,
Marek Lindner <lindner_marek@...oo.de>,
Sven Eckelmann <sven@...fation.org>
Subject: [PATCH 1/8] batman-adv: Move bonding / iface alternating router search to own functions
From: Linus Lüssing <linus.luessing@....de>
This decreases the size of find_router() by outsourcing the router
search for the bonding and interface alternating modes to their own sub
functions. This shall make it easier to keep track of the correct
refcounting later.
Signed-off-by: Linus Lüssing <linus.luessing@....de>
Signed-off-by: Marek Lindner <lindner_marek@...oo.de>
Signed-off-by: Sven Eckelmann <sven@...fation.org>
---
net/batman-adv/routing.c | 180 +++++++++++++++++++++++++++-------------------
1 files changed, 105 insertions(+), 75 deletions(-)
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index c172f5d..f212abe 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -1092,6 +1092,106 @@ out:
return ret;
}
+/* In the bonding case, send the packets in a round
+ * robin fashion over the remaining interfaces.
+ *
+ * This method rotates the bonding list and increases the
+ * returned router's refcount. */
+static struct neigh_node *find_bond_router(struct orig_node *primary_orig,
+ struct hard_iface *recv_if)
+{
+ struct neigh_node *tmp_neigh_node;
+ struct neigh_node *router = NULL, *first_candidate = NULL;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
+ bonding_list) {
+ if (!first_candidate)
+ first_candidate = tmp_neigh_node;
+
+ /* recv_if == NULL on the first node. */
+ if (tmp_neigh_node->if_incoming == recv_if)
+ continue;
+
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
+
+ router = tmp_neigh_node;
+ break;
+ }
+
+ /* use the first candidate if nothing was found. */
+ if (!router && first_candidate &&
+ atomic_inc_not_zero(&first_candidate->refcount))
+ router = first_candidate;
+
+ if (!router)
+ goto out;
+
+ /* selected should point to the next element
+ * after the current router */
+ spin_lock_bh(&primary_orig->neigh_list_lock);
+ /* this is a list_move(), which unfortunately
+ * does not exist as rcu version */
+ list_del_rcu(&primary_orig->bond_list);
+ list_add_rcu(&primary_orig->bond_list,
+ &router->bonding_list);
+ spin_unlock_bh(&primary_orig->neigh_list_lock);
+
+out:
+ rcu_read_unlock();
+ return router;
+}
+
+/* Interface Alternating: Use the best of the
+ * remaining candidates which are not using
+ * this interface.
+ *
+ * Increases the returned router's refcount */
+static struct neigh_node *find_ifalter_router(struct orig_node *primary_orig,
+ struct hard_iface *recv_if)
+{
+ struct neigh_node *tmp_neigh_node;
+ struct neigh_node *router = NULL, *first_candidate = NULL;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(tmp_neigh_node, &primary_orig->bond_list,
+ bonding_list) {
+ if (!first_candidate)
+ first_candidate = tmp_neigh_node;
+
+ /* recv_if == NULL on the first node. */
+ if (tmp_neigh_node->if_incoming == recv_if)
+ continue;
+
+ if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
+ continue;
+
+ /* if we don't have a router yet
+ * or this one is better, choose it. */
+ if ((!router) ||
+ (tmp_neigh_node->tq_avg > router->tq_avg)) {
+ /* decrement refcount of
+ * previously selected router */
+ if (router)
+ neigh_node_free_ref(router);
+
+ router = tmp_neigh_node;
+ atomic_inc_not_zero(&router->refcount);
+ }
+
+ neigh_node_free_ref(tmp_neigh_node);
+ }
+
+ /* use the first candidate if nothing was found. */
+ if (!router && first_candidate &&
+ atomic_inc_not_zero(&first_candidate->refcount))
+ router = first_candidate;
+
+ rcu_read_unlock();
+ return router;
+}
+
/* find a suitable router for this originator, and use
* bonding if possible. increases the found neighbors
* refcount.*/
@@ -1101,7 +1201,7 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
{
struct orig_node *primary_orig_node;
struct orig_node *router_orig;
- struct neigh_node *router, *first_candidate, *tmp_neigh_node;
+ struct neigh_node *router;
static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0};
int bonding_enabled;
@@ -1157,82 +1257,12 @@ struct neigh_node *find_router(struct bat_priv *bat_priv,
* in. */
neigh_node_free_ref(router);
- first_candidate = NULL;
- router = NULL;
- if (bonding_enabled) {
- /* in the bonding case, send the packets in a round
- * robin fashion over the remaining interfaces. */
+ if (bonding_enabled)
+ router = find_bond_router(primary_orig_node, recv_if);
+ else
+ router = find_ifalter_router(primary_orig_node, recv_if);
- list_for_each_entry_rcu(tmp_neigh_node,
- &primary_orig_node->bond_list, bonding_list) {
- if (!first_candidate)
- first_candidate = tmp_neigh_node;
- /* recv_if == NULL on the first node. */
- if (tmp_neigh_node->if_incoming != recv_if &&
- atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
- router = tmp_neigh_node;
- break;
- }
- }
-
- /* use the first candidate if nothing was found. */
- if (!router && first_candidate &&
- atomic_inc_not_zero(&first_candidate->refcount))
- router = first_candidate;
-
- if (!router) {
- rcu_read_unlock();
- return NULL;
- }
-
- /* selected should point to the next element
- * after the current router */
- spin_lock_bh(&primary_orig_node->neigh_list_lock);
- /* this is a list_move(), which unfortunately
- * does not exist as rcu version */
- list_del_rcu(&primary_orig_node->bond_list);
- list_add_rcu(&primary_orig_node->bond_list,
- &router->bonding_list);
- spin_unlock_bh(&primary_orig_node->neigh_list_lock);
-
- } else {
- /* if bonding is disabled, use the best of the
- * remaining candidates which are not using
- * this interface. */
- list_for_each_entry_rcu(tmp_neigh_node,
- &primary_orig_node->bond_list, bonding_list) {
- if (!first_candidate)
- first_candidate = tmp_neigh_node;
-
- /* recv_if == NULL on the first node. */
- if (tmp_neigh_node->if_incoming == recv_if)
- continue;
-
- if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
- continue;
-
- /* if we don't have a router yet
- * or this one is better, choose it. */
- if ((!router) ||
- (tmp_neigh_node->tq_avg > router->tq_avg)) {
- /* decrement refcount of
- * previously selected router */
- if (router)
- neigh_node_free_ref(router);
-
- router = tmp_neigh_node;
- atomic_inc_not_zero(&router->refcount);
- }
-
- neigh_node_free_ref(tmp_neigh_node);
- }
-
- /* use the first candidate if nothing was found. */
- if (!router && first_candidate &&
- atomic_inc_not_zero(&first_candidate->refcount))
- router = first_candidate;
- }
return_router:
rcu_read_unlock();
return router;
--
1.7.4.4
--
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