[PATCH 4.19 46/96] net: bridge: fdb: convert is_static to bitops

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

[ Upstream commit 29e63fffd666f1945756882d4b02bc7bec132101 ]

Convert the is_static to bitops, make use of the combined
test_and_set/clear_bit to simplify expressions in fdb_add_entry.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: bee2ef946d31 ("net: bridge: br_fdb_external_learn_add(): always set EXT_LEARN")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/bridge/br_fdb.c     | 40 +++++++++++++++++++---------------------
 net/bridge/br_private.h |  4 ++--
 2 files changed, 21 insertions(+), 23 deletions(-)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index f01ccf6ca4f4..2639cc744bca 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -80,8 +80,9 @@ static inline unsigned long hold_time(const struct net_bridge *br)
 static inline int has_expired(const struct net_bridge *br,
 				  const struct net_bridge_fdb_entry *fdb)
 {
-	return !fdb->is_static && !fdb->added_by_external_learn &&
-		time_before_eq(fdb->updated + hold_time(br), jiffies);
+	return !test_bit(BR_FDB_STATIC, &fdb->flags) &&
+	       !fdb->added_by_external_learn &&
+	       time_before_eq(fdb->updated + hold_time(br), jiffies);
 }
 
 static void fdb_rcu_free(struct rcu_head *head)
@@ -202,7 +203,7 @@ static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
 {
 	trace_fdb_delete(br, f);
 
-	if (f->is_static)
+	if (test_bit(BR_FDB_STATIC, &f->flags))
 		fdb_del_hw_addr(br, f->key.addr.addr);
 
 	hlist_del_init_rcu(&f->fdb_node);
@@ -355,7 +356,8 @@ void br_fdb_cleanup(struct work_struct *work)
 	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
 		unsigned long this_timer;
 
-		if (f->is_static || f->added_by_external_learn)
+		if (test_bit(BR_FDB_STATIC, &f->flags) ||
+		    f->added_by_external_learn)
 			continue;
 		this_timer = f->updated + delay;
 		if (time_after(this_timer, now)) {
@@ -382,7 +384,7 @@ void br_fdb_flush(struct net_bridge *br)
 
 	spin_lock_bh(&br->hash_lock);
 	hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
-		if (!f->is_static)
+		if (!test_bit(BR_FDB_STATIC, &f->flags))
 			fdb_delete(br, f, true);
 	}
 	spin_unlock_bh(&br->hash_lock);
@@ -406,7 +408,8 @@ void br_fdb_delete_by_port(struct net_bridge *br,
 			continue;
 
 		if (!do_all)
-			if (f->is_static || (vid && f->key.vlan_id != vid))
+			if (test_bit(BR_FDB_STATIC, &f->flags) ||
+			    (vid && f->key.vlan_id != vid))
 				continue;
 
 		if (test_bit(BR_FDB_LOCAL, &f->flags))
@@ -479,7 +482,7 @@ int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 		fe->port_hi = f->dst->port_no >> 8;
 
 		fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags);
-		if (!f->is_static)
+		if (!test_bit(BR_FDB_STATIC, &f->flags))
 			fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
 		++fe;
 		++num;
@@ -506,7 +509,8 @@ static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
 		fdb->flags = 0;
 		if (is_local)
 			set_bit(BR_FDB_LOCAL, &fdb->flags);
-		fdb->is_static = is_static;
+		if (is_static)
+			set_bit(BR_FDB_STATIC, &fdb->flags);
 		fdb->added_by_user = 0;
 		fdb->added_by_external_learn = 0;
 		fdb->offloaded = 0;
@@ -628,7 +632,7 @@ static int fdb_to_nud(const struct net_bridge *br,
 {
 	if (test_bit(BR_FDB_LOCAL, &fdb->flags))
 		return NUD_PERMANENT;
-	else if (fdb->is_static)
+	else if (test_bit(BR_FDB_STATIC, &fdb->flags))
 		return NUD_NOARP;
 	else if (has_expired(br, fdb))
 		return NUD_STALE;
@@ -825,22 +829,16 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
 	if (fdb_to_nud(br, fdb) != state) {
 		if (state & NUD_PERMANENT) {
 			set_bit(BR_FDB_LOCAL, &fdb->flags);
-			if (!fdb->is_static) {
-				fdb->is_static = 1;
+			if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
 				fdb_add_hw_addr(br, addr);
-			}
 		} else if (state & NUD_NOARP) {
 			clear_bit(BR_FDB_LOCAL, &fdb->flags);
-			if (!fdb->is_static) {
-				fdb->is_static = 1;
+			if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags))
 				fdb_add_hw_addr(br, addr);
-			}
 		} else {
 			clear_bit(BR_FDB_LOCAL, &fdb->flags);
-			if (fdb->is_static) {
-				fdb->is_static = 0;
+			if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags))
 				fdb_del_hw_addr(br, addr);
-			}
 		}
 
 		modified = true;
@@ -1047,7 +1045,7 @@ int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
 		/* We only care for static entries */
-		if (!f->is_static)
+		if (!test_bit(BR_FDB_STATIC, &f->flags))
 			continue;
 		err = dev_uc_add(p->dev, f->key.addr.addr);
 		if (err)
@@ -1061,7 +1059,7 @@ int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
 rollback:
 	hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
 		/* We only care for static entries */
-		if (!tmp->is_static)
+		if (!test_bit(BR_FDB_STATIC, &tmp->flags))
 			continue;
 		if (tmp == f)
 			break;
@@ -1080,7 +1078,7 @@ void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
 		/* We only care for static entries */
-		if (!f->is_static)
+		if (!test_bit(BR_FDB_STATIC, &f->flags))
 			continue;
 
 		dev_uc_del(p->dev, f->key.addr.addr);
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 6a38ea247a9e..c3160d73e6ed 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -171,6 +171,7 @@ struct net_bridge_vlan_group {
 /* bridge fdb flags */
 enum {
 	BR_FDB_LOCAL,
+	BR_FDB_STATIC,
 };
 
 struct net_bridge_fdb_key {
@@ -185,8 +186,7 @@ struct net_bridge_fdb_entry {
 	struct net_bridge_fdb_key	key;
 	struct hlist_node		fdb_node;
 	unsigned long			flags;
-	unsigned char			is_static:1,
-					is_sticky:1,
+	unsigned char			is_sticky:1,
 					added_by_user:1,
 					added_by_external_learn:1,
 					offloaded:1;
-- 
2.43.0