[PATCH net-next v4 14/15] net: dsa: Define max num of bridges in tag8021q implementation

[Pawel Dembicki <paweldembicki@gmail.com>]

Max number of bridges in tag8021q implementation is strictly limited
by VBID size: 3 bits. But zero is reserved and only 7 values can be used.

This patch adds define which describe maximum possible value.

Suggested-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
---
v4:
  - introduce patch

 drivers/net/dsa/sja1105/sja1105_main.c | 3 +--
 include/linux/dsa/8021q.h              | 5 +++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 6646f7fb0f90..6e22d7a6bfa3 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -3156,8 +3156,7 @@ static int sja1105_setup(struct dsa_switch *ds)
 	ds->vlan_filtering_is_global = true;
 	ds->untag_bridge_pvid = true;
 	ds->fdb_isolation = true;
-	/* tag_8021q has 3 bits for the VBID, and the value 0 is reserved */
-	ds->max_num_bridges = 7;
+	ds->max_num_bridges = DSA_TAG_8021Q_MAX_NUM_BRIDGES;
 
 	/* Advertise the 8 egress queues */
 	ds->num_tx_queues = SJA1105_NUM_TC;
diff --git a/include/linux/dsa/8021q.h b/include/linux/dsa/8021q.h
index f3664ee12170..1dda2a13b832 100644
--- a/include/linux/dsa/8021q.h
+++ b/include/linux/dsa/8021q.h
@@ -8,6 +8,11 @@
 #include <net/dsa.h>
 #include <linux/types.h>
 
+/* VBID is limited to three bits only and zero is reserved.
+ * Only 7 bridges can be enumerated.
+ */
+#define DSA_TAG_8021Q_MAX_NUM_BRIDGES	7
+
 int dsa_tag_8021q_register(struct dsa_switch *ds, __be16 proto);
 
 void dsa_tag_8021q_unregister(struct dsa_switch *ds);
-- 
2.34.1