mlxsw: spectrum_fid: Set 'mid_base' as part of flood tables initialization

The PGT (Port Group Table) table maps an index to a bitmap of local ports
to which a packet needs to be replicated. This table is used for layer 2
multicast and flooding.

The index to PGT table which is called 'mid_index', is a result of
'mid_base' + 'fid_offset'. Using the legacy bridge model, firmware
configures 'mid_base'. However, using the new model, software is
responsible to configure it via SFGC register. The first 15K entries will
be used for flooding and the rest for multicast. The table will look as
follows:

+----------------------------+
|                            |
| 802.1q, unicast flooding   | 4K entries
|                            |
+----------------------------+
|                            |
| 802.1q, multicast flooding | 4K entries
|                            |
+----------------------------+
|                            |
| 802.1q, broadcast flooding | 4K entries
|                            |
+----------------------------+
| 802.1d, unicast flooding   | 1K entries
+----------------------------+
| 802.1d, multicast flooding | 1K entries
+----------------------------+
| 802.1d, broadcast flooding | 1K entries
+----------------------------+
|                            |
|                            |
|    Multicast entries       | The rest of the table
|                            |
|                            |
+----------------------------+

Add 'pgt_base' to 'struct mlxsw_sp_fid_family' and use it to calculate
MID base, set 'SFGC.mid_base' as part of flood tables initialization.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/mellanox/mlxsw/reg.h

@@ -1114,13 +1114,14 @@ static inline void
 mlxsw_reg_sfgc_pack(char *payload, enum mlxsw_reg_sfgc_type type,
 		    enum mlxsw_reg_bridge_type bridge_type,
 		    enum mlxsw_flood_table_type table_type,
-		    unsigned int flood_table)
+		    unsigned int flood_table, u16 mid_base)
 {
 	MLXSW_REG_ZERO(sfgc, payload);
 	mlxsw_reg_sfgc_type_set(payload, type);
 	mlxsw_reg_sfgc_bridge_type_set(payload, bridge_type);
 	mlxsw_reg_sfgc_table_type_set(payload, table_type);
 	mlxsw_reg_sfgc_flood_table_set(payload, flood_table);
+	mlxsw_reg_sfgc_mid_base_set(payload, mid_base);
 }
 
 /* SFDF - Switch Filtering DB Flush

drivers/net/ethernet/mellanox/mlxsw/spectrum_fid.c

@@ -110,6 +110,7 @@ struct mlxsw_sp_fid_family {
 	struct mlxsw_sp *mlxsw_sp;
 	bool flood_rsp;
 	enum mlxsw_reg_bridge_type bridge_type;
+	u16 pgt_base;
 };
 
 static const int mlxsw_sp_sfgc_uc_packet_types[MLXSW_REG_SFGC_TYPE_MAX] = {
@@ -321,6 +322,18 @@ mlxsw_sp_fid_flood_table_lookup(const struct mlxsw_sp_fid *fid,
 	return NULL;
 }
 
+static u16
+mlxsw_sp_fid_flood_table_mid(const struct mlxsw_sp_fid_family *fid_family,
+			     const struct mlxsw_sp_flood_table *flood_table,
+			     u16 fid_offset)
+{
+	u16 num_fids;
+
+	num_fids = fid_family->end_index - fid_family->start_index + 1;
+	return fid_family->pgt_base + num_fids * flood_table->table_index +
+	       fid_offset;
+}
+
 int mlxsw_sp_fid_flood_set(struct mlxsw_sp_fid *fid,
 			   enum mlxsw_sp_flood_type packet_type, u16 local_port,
 			   bool member)
@@ -736,6 +749,10 @@ static const struct mlxsw_sp_fid_ops mlxsw_sp_fid_8021d_ops = {
 	.fdb_clear_offload	= mlxsw_sp_fid_8021d_fdb_clear_offload,
 };
 
+#define MLXSW_SP_FID_8021Q_MAX (VLAN_N_VID - 2)
+#define MLXSW_SP_FID_8021Q_PGT_BASE 0
+#define MLXSW_SP_FID_8021D_PGT_BASE (3 * MLXSW_SP_FID_8021Q_MAX)
+
 static const struct mlxsw_sp_flood_table mlxsw_sp_fid_8021d_flood_tables[] = {
 	{
 		.packet_type	= MLXSW_SP_FLOOD_TYPE_UC,
@@ -765,6 +782,7 @@ static const struct mlxsw_sp_fid_family mlxsw_sp_fid_8021d_family = {
 	.rif_type		= MLXSW_SP_RIF_TYPE_FID,
 	.ops			= &mlxsw_sp_fid_8021d_ops,
 	.bridge_type		= MLXSW_REG_BRIDGE_TYPE_1,
+	.pgt_base		= MLXSW_SP_FID_8021D_PGT_BASE,
 };
 
 static bool
@@ -801,7 +819,7 @@ static const struct mlxsw_sp_fid_ops mlxsw_sp_fid_8021q_emu_ops = {
 /* There are 4K-2 emulated 802.1Q FIDs, starting right after the 802.1D FIDs */
 #define MLXSW_SP_FID_8021Q_EMU_START	(VLAN_N_VID + MLXSW_SP_FID_8021D_MAX)
 #define MLXSW_SP_FID_8021Q_EMU_END	(MLXSW_SP_FID_8021Q_EMU_START + \
-					 VLAN_VID_MASK - 2)
+					 MLXSW_SP_FID_8021Q_MAX - 1)
 
 /* Range and flood configuration must match mlxsw_config_profile */
 static const struct mlxsw_sp_fid_family mlxsw_sp_fid_8021q_emu_family = {
@@ -814,6 +832,7 @@ static const struct mlxsw_sp_fid_family mlxsw_sp_fid_8021q_emu_family = {
 	.rif_type		= MLXSW_SP_RIF_TYPE_VLAN_EMU,
 	.ops			= &mlxsw_sp_fid_8021q_emu_ops,
 	.bridge_type            = MLXSW_REG_BRIDGE_TYPE_1,
+	.pgt_base		= MLXSW_SP_FID_8021Q_PGT_BASE,
 };
 
 static void mlxsw_sp_fid_rfid_setup(struct mlxsw_sp_fid *fid, const void *arg)
@@ -1151,8 +1170,11 @@ mlxsw_sp_fid_flood_table_init(struct mlxsw_sp_fid_family *fid_family,
 {
 	enum mlxsw_sp_flood_type packet_type = flood_table->packet_type;
 	const int *sfgc_packet_types;
+	u16 mid_base, table_index;
 	int i;
 
+	mid_base = mlxsw_sp_fid_flood_table_mid(fid_family, flood_table, 0);
+
 	sfgc_packet_types = mlxsw_sp_packet_type_sfgc_types[packet_type];
 	for (i = 0; i < MLXSW_REG_SFGC_TYPE_MAX; i++) {
 		struct mlxsw_sp *mlxsw_sp = fid_family->mlxsw_sp;
@@ -1161,9 +1183,14 @@ mlxsw_sp_fid_flood_table_init(struct mlxsw_sp_fid_family *fid_family,
 
 		if (!sfgc_packet_types[i])
 			continue;
+
+		mid_base = mlxsw_sp->ubridge ? mid_base : 0;
+		table_index = mlxsw_sp->ubridge ? 0 : flood_table->table_index;
+
 		mlxsw_reg_sfgc_pack(sfgc_pl, i, fid_family->bridge_type,
-				    flood_table->table_type,
-				    flood_table->table_index);
+				    flood_table->table_type, table_index,
+				    mid_base);
+
 		err = mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(sfgc), sfgc_pl);
 		if (err)
 			return err;