linux-kernel - [PATCH net-next v2 1/3] net: ocelot: Add PGID

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Date:   Tue, 16 Mar 2021 21:10:17 +0100
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>,
        <vladimir.oltean@....com>, <claudiu.manoil@....com>,
        <alexandre.belloni@...tlin.com>, <andrew@...n.ch>,
        <vivien.didelot@...il.com>, <f.fainelli@...il.com>
CC:     <UNGLinuxDriver@...rochip.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>
Subject: [PATCH net-next v2 1/3] net: ocelot: Add PGID_BLACKHOLE

Add a new PGID that is used not to forward frames anywhere. It is used
by MRP to make sure that MRP Test frames will not reach CPU port.

Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
 drivers/net/ethernet/mscc/ocelot.c | 3 +++
 include/soc/mscc/ocelot.h          | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 46e5c9136bac..f74d7cf002a5 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -2051,6 +2051,9 @@ int ocelot_init(struct ocelot *ocelot)
 
 		ocelot_write_rix(ocelot, val, ANA_PGID_PGID, i);
 	}
+
+	ocelot_write_rix(ocelot, 0, ANA_PGID_PGID, PGID_BLACKHOLE);
+
 	/* 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)),
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 425ff29d9389..4d10ccc8e7b5 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -51,6 +51,7 @@
  */
 
 /* Reserve some destination PGIDs at the end of the range:
+ * PGID_BLACKHOLE: used for not forwarding the frames
  * 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.
@@ -59,6 +60,7 @@
  * PGID_MCIPV6: the flooding destinations for IPv6 multicast traffic.
  * PGID_BC: the flooding destinations for broadcast traffic.
  */
+#define PGID_BLACKHOLE			57
 #define PGID_CPU			58
 #define PGID_UC				59
 #define PGID_MC				60
@@ -73,7 +75,7 @@
 
 #define for_each_nonreserved_multicast_dest_pgid(ocelot, pgid)	\
 	for ((pgid) = (ocelot)->num_phys_ports + 1;		\
-	     (pgid) < PGID_CPU;					\
+	     (pgid) < PGID_BLACKHOLE;				\
 	     (pgid)++)
 
 #define for_each_aggr_pgid(ocelot, pgid)			\
-- 
2.30.1