net: mscc: ocelot: use separate flooding PGID for broadcast

In preparation of offloading the bridge port flags which have
independent settings for unknown multicast and for broadcast, we should
also start reserving one destination Port Group ID for the flooding of
broadcast packets, to allow configuring it individually.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/felix.c

@@ -299,6 +299,7 @@ static int felix_setup_tag_8021q(struct dsa_switch *ds, int cpu)
 	cpu_flood = ANA_PGID_PGID_PGID(BIT(ocelot->num_phys_ports));
 	ocelot_rmw_rix(ocelot, 0, cpu_flood, ANA_PGID_PGID, PGID_UC);
 	ocelot_rmw_rix(ocelot, 0, cpu_flood, ANA_PGID_PGID, PGID_MC);
+	ocelot_rmw_rix(ocelot, 0, cpu_flood, ANA_PGID_PGID, PGID_BC);
 
 	felix->dsa_8021q_ctx = kzalloc(sizeof(*felix->dsa_8021q_ctx),
 				       GFP_KERNEL);
@@ -412,6 +413,7 @@ static int felix_setup_tag_npi(struct dsa_switch *ds, int cpu)
 	cpu_flood = ANA_PGID_PGID_PGID(BIT(ocelot->num_phys_ports));
 	ocelot_rmw_rix(ocelot, cpu_flood, cpu_flood, ANA_PGID_PGID, PGID_UC);
 	ocelot_rmw_rix(ocelot, cpu_flood, cpu_flood, ANA_PGID_PGID, PGID_MC);
+	ocelot_rmw_rix(ocelot, cpu_flood, cpu_flood, ANA_PGID_PGID, PGID_BC);
 
 	return 0;
 }

drivers/net/ethernet/mscc/ocelot.c

@@ -1716,7 +1716,7 @@ int ocelot_init(struct ocelot *ocelot)
 	/* Setup flooding PGIDs */
 	for (i = 0; i < ocelot->num_flooding_pgids; i++)
 		ocelot_write_rix(ocelot, ANA_FLOODING_FLD_MULTICAST(PGID_MC) |
-				 ANA_FLOODING_FLD_BROADCAST(PGID_MC) |
+				 ANA_FLOODING_FLD_BROADCAST(PGID_BC) |
 				 ANA_FLOODING_FLD_UNICAST(PGID_UC),
 				 ANA_FLOODING, i);
 	ocelot_write(ocelot, ANA_FLOODING_IPMC_FLD_MC6_DATA(PGID_MCIPV6) |
@@ -1737,15 +1737,18 @@ int ocelot_init(struct ocelot *ocelot)
 		ocelot_write_rix(ocelot, 0, ANA_PGID_PGID, PGID_SRC + port);
 	}
 
-	/* Allow broadcast MAC frames. */
 	for_each_nonreserved_multicast_dest_pgid(ocelot, i) {
 		u32 val = ANA_PGID_PGID_PGID(GENMASK(ocelot->num_phys_ports - 1, 0));
 
 		ocelot_write_rix(ocelot, val, ANA_PGID_PGID, i);
 	}
-	ocelot_write_rix(ocelot,
-			 ANA_PGID_PGID_PGID(GENMASK(ocelot->num_phys_ports, 0)),
-			 ANA_PGID_PGID, PGID_MC);
+	/* Allow broadcast and unknown L2 multicast to the CPU. */
+	ocelot_rmw_rix(ocelot, ANA_PGID_PGID_PGID(BIT(ocelot->num_phys_ports)),
+		       ANA_PGID_PGID_PGID(BIT(ocelot->num_phys_ports)),
+		       ANA_PGID_PGID, PGID_MC);
+	ocelot_rmw_rix(ocelot, ANA_PGID_PGID_PGID(BIT(ocelot->num_phys_ports)),
+		       ANA_PGID_PGID_PGID(BIT(ocelot->num_phys_ports)),
+		       ANA_PGID_PGID, PGID_BC);
 	ocelot_write_rix(ocelot, 0, ANA_PGID_PGID, PGID_MCIPV4);
 	ocelot_write_rix(ocelot, 0, ANA_PGID_PGID, PGID_MCIPV6);
 

include/soc/mscc/ocelot.h

@@ -54,16 +54,17 @@
  * PGID_CPU: used for whitelisting certain MAC addresses, such as the addresses
  *           of the switch port net devices, towards the CPU port module.
  * PGID_UC: the flooding destinations for unknown unicast traffic.
- * PGID_MC: the flooding destinations for broadcast and non-IP multicast
- *          traffic.
+ * PGID_MC: the flooding destinations for non-IP multicast traffic.
  * PGID_MCIPV4: the flooding destinations for IPv4 multicast traffic.
  * PGID_MCIPV6: the flooding destinations for IPv6 multicast traffic.
+ * PGID_BC: the flooding destinations for broadcast traffic.
  */
-#define PGID_CPU			59
-#define PGID_UC				60
-#define PGID_MC				61
-#define PGID_MCIPV4			62
-#define PGID_MCIPV6			63
+#define PGID_CPU			58
+#define PGID_UC				59
+#define PGID_MC				60
+#define PGID_MCIPV4			61
+#define PGID_MCIPV6			62
+#define PGID_BC				63
 
 #define for_each_unicast_dest_pgid(ocelot, pgid)		\
 	for ((pgid) = 0;					\