netdev - [PATCH v3 net-next 05/17] net: dsa: sja1105: Reverse TPID and TPID2

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Message-Id: <20190604170756.14338-6-olteanv@gmail.com>
Date:   Tue,  4 Jun 2019 20:07:44 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     f.fainelli@...il.com, vivien.didelot@...il.com, andrew@...n.ch,
        davem@...emloft.net, richardcochran@...il.com,
        john.stultz@...aro.org, tglx@...utronix.de, sboyd@...nel.org
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Vladimir Oltean <olteanv@...il.com>
Subject: [PATCH v3 net-next 05/17] net: dsa: sja1105: Reverse TPID and TPID2

>From reading the P/Q/R/S user manual, it appears that TPID is used by
the switch for detecting S-tags and TPID2 for C-tags.  Their meaning is
not clear from the E/T manual.

Signed-off-by: Vladimir Oltean <olteanv@...il.com>
---
Changes in v3:

Patch is new.

 drivers/net/dsa/sja1105/sja1105_main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 909497aa4b6f..0f34e713c408 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -1421,8 +1421,8 @@ static int sja1105_vlan_filtering(struct dsa_switch *ds, int port, bool enabled)
 
 	if (enabled) {
 		/* Enable VLAN filtering. */
-		tpid  = ETH_P_8021Q;
-		tpid2 = ETH_P_8021AD;
+		tpid  = ETH_P_8021AD;
+		tpid2 = ETH_P_8021Q;
 	} else {
 		/* Disable VLAN filtering. */
 		tpid  = ETH_P_SJA1105;
@@ -1431,7 +1431,9 @@ static int sja1105_vlan_filtering(struct dsa_switch *ds, int port, bool enabled)
 
 	table = &priv->static_config.tables[BLK_IDX_GENERAL_PARAMS];
 	general_params = table->entries;
+	/* EtherType used to identify outer tagged (S-tag) VLAN traffic */
 	general_params->tpid = tpid;
+	/* EtherType used to identify inner tagged (C-tag) VLAN traffic */
 	general_params->tpid2 = tpid2;
 
 	rc = sja1105_static_config_reload(priv);
-- 
2.17.1