netdev - [PATCH net-next 2/5] net: mscc: ocelot: make the NPI port a proper target for FDB and MDB

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Message-Id: <20200621114603.119608-3-olteanv@gmail.com>
Date:   Sun, 21 Jun 2020 14:46:00 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     UNGLinuxDriver@...rochip.com, alexandre.belloni@...tlin.com,
        andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        claudiu.manoil@....com, alexandru.marginean@....com,
        xiaoliang.yang_1@....com, yangbo.lu@....com
Subject: [PATCH net-next 2/5] net: mscc: ocelot: make the NPI port a proper target for FDB and MDB

From: Vladimir Oltean <vladimir.oltean@....com>

When used in DSA mode (as seen in Felix), the DEST_IDX in the MAC table
should point to the PGID for the CPU port (PGID_CPU) and not for the
Ethernet port where the CPU queues are redirected to (also known as Node
Processor Interface - NPI).

Because for Felix this distinction shouldn't really matter (from DSA
perspective, the NPI port _is_ the CPU port), make the ocelot library
act upon the CPU port when NPI mode is enabled. This has no effect for
the mscc_ocelot driver for VSC7514, because that does not use NPI (and
ocelot->npi is -1).

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 922c3e855c3a..4aadb65a6af8 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -535,6 +535,10 @@ int ocelot_fdb_add(struct ocelot *ocelot, int port,
 		   const unsigned char *addr, u16 vid)
 {
 	struct ocelot_port *ocelot_port = ocelot->ports[port];
+	int pgid = port;
+
+	if (port == ocelot->npi)
+		pgid = PGID_CPU;
 
 	if (!vid) {
 		if (!ocelot_port->vlan_aware)
@@ -550,7 +554,7 @@ int ocelot_fdb_add(struct ocelot *ocelot, int port,
 			return -EINVAL;
 	}
 
-	return ocelot_mact_learn(ocelot, port, addr, vid, ENTRYTYPE_LOCKED);
+	return ocelot_mact_learn(ocelot, pgid, addr, vid, ENTRYTYPE_LOCKED);
 }
 EXPORT_SYMBOL(ocelot_fdb_add);
 
@@ -953,6 +957,9 @@ int ocelot_port_obj_add_mdb(struct net_device *dev,
 	u16 vid = mdb->vid;
 	bool new = false;
 
+	if (port == ocelot->npi)
+		port = ocelot->num_phys_ports;
+
 	if (!vid)
 		vid = ocelot_port->pvid;
 
@@ -997,6 +1004,9 @@ int ocelot_port_obj_del_mdb(struct net_device *dev,
 	int port = priv->chip_port;
 	u16 vid = mdb->vid;
 
+	if (port == ocelot->npi)
+		port = ocelot->num_phys_ports;
+
 	if (!vid)
 		vid = ocelot_port->pvid;
 
-- 
2.25.1