From ce20fdd670ac375a4e3dff91c2888ad9ff9eef56 Mon Sep 17 00:00:00 2001 From: Pawel Dembicki Date: Sat, 13 Jul 2024 23:16:15 +0200 Subject: [PATCH] net: dsa: Define max num of bridges in tag8021q implementation 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 Signed-off-by: Pawel Dembicki Reviewed-by: Florian Fainelli Reviewed-by: Linus Walleij Reviewed-by: Vladimir Oltean Link: https://patch.msgid.link/20240713211620.1125910-10-paweldembicki@gmail.com Signed-off-by: Jakub Kicinski --- 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 ee0fb1c343f16..0c55a29d7dd39 100644 --- a/drivers/net/dsa/sja1105/sja1105_main.c +++ b/drivers/net/dsa/sja1105/sja1105_main.c @@ -3167,8 +3167,7 @@ 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 f3664ee121704..1dda2a13b8322 100644 --- a/include/linux/dsa/8021q.h +++ b/include/linux/dsa/8021q.h @@ -8,6 +8,11 @@ #include #include +/* 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); -- 2.47.2