net: dsa: sja1105: Make P/Q/R/S learn MAC addresses

At the end of the commit 1da73821 ("net: dsa: sja1105: Add FDB
operations for P/Q/R/S series") message, I said that:

    At the moment only FDB entries installed statically through 'bridge fdb'
    are visible in the dump callback - the dynamically learned ones are
    still under investigation.

It looks like the reason why they were not visible in 'bridge fdb' was
that they were never learned - always flooded.

SJA1105 P/Q/R/S manual says about the MAXADDRP[port] field:

    Specify the maximum number of MAC address dynamically learned from
    the respective port. It is used to limit the number of learned MAC
    addresses per port.

It looks like not providing a value in the static config (aka providing
zeroes) is enough for it to not store the learned addresses in the FDB.

For now we divide the 1024 entry FDB "equally" amongst the 5 ports. This
may be revisited if the situation calls for that - for now I'm happy
that learning works.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/sja1105/sja1105_main.c

@@ -203,6 +203,7 @@ static int sja1105_init_static_fdb(struct sja1105_private *priv)
 static int sja1105_init_l2_lookup_params(struct sja1105_private *priv)
 {
 	struct sja1105_table *table;
+	u64 max_fdb_entries = SJA1105_MAX_L2_LOOKUP_COUNT / SJA1105_NUM_PORTS;
 	struct sja1105_l2_lookup_params_entry default_l2_lookup_params = {
 		/* Learned FDB entries are forgotten after 300 seconds */
 		.maxage = SJA1105_AGEING_TIME_MS(300000),
@@ -210,6 +211,8 @@ static int sja1105_init_l2_lookup_params(struct sja1105_private *priv)
 		.dyn_tbsz = SJA1105ET_FDB_BIN_SIZE,
 		/* And the P/Q/R/S equivalent setting: */
 		.start_dynspc = 0,
+		.maxaddrp = {max_fdb_entries, max_fdb_entries, max_fdb_entries,
+			     max_fdb_entries, max_fdb_entries, },
 		/* 2^8 + 2^5 + 2^3 + 2^2 + 2^1 + 1 in Koopman notation */
 		.poly = 0x97,
 		/* This selects between Independent VLAN Learning (IVL) and

drivers/net/dsa/sja1105/sja1105_static_config.c

@@ -230,7 +230,11 @@ sja1105pqrs_l2_lookup_params_entry_packing(void *buf, void *entry_ptr,
 {
 	const size_t size = SJA1105PQRS_SIZE_L2_LOOKUP_PARAMS_ENTRY;
 	struct sja1105_l2_lookup_params_entry *entry = entry_ptr;
+	int offset, i;
 
+	for (i = 0, offset = 58; i < 5; i++, offset += 11)
+		sja1105_packing(buf, &entry->maxaddrp[i],
+				offset + 10, offset + 0, size, op);
 	sja1105_packing(buf, &entry->maxage,         57,  43, size, op);
 	sja1105_packing(buf, &entry->start_dynspc,   42,  33, size, op);
 	sja1105_packing(buf, &entry->drpnolearn,     32,  28, size, op);

drivers/net/dsa/sja1105/sja1105_static_config.h

@@ -151,6 +151,7 @@ struct sja1105_l2_lookup_entry {
 };
 
 struct sja1105_l2_lookup_params_entry {
+	u64 maxaddrp[5];     /* P/Q/R/S only */
 	u64 start_dynspc;    /* P/Q/R/S only */
 	u64 drpnolearn;      /* P/Q/R/S only */
 	u64 use_static;      /* P/Q/R/S only */