mlxsw: Add an indication of SMPE index validity for PGT table

In Spectrum-1, the index into the MPE table - called switch multicast to
port egress VID (SMPE) - is derived from the PGT entry, whereas in
Spectrum-2 and later ASICs it is derived from the FID.

Therefore, in Spectrum-1, the SMPE index needs to be programmed as part of
the PGT entry via SMID register, while it is reserved for Spectrum-2 and
later ASICs.

Add 'pgt_smpe_index_valid' boolean as part of 'struct mlxsw_sp' and set
it to true for Spectrum-1 and to false for the later ASICs. Add
'smpe_index_valid' as part of 'struct mlxsw_sp_pgt' and set it according
to the value in 'struct mlxsw_sp' as part of PGT 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/spectrum.c

@@ -3235,6 +3235,7 @@ static int mlxsw_sp1_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->listeners_count = ARRAY_SIZE(mlxsw_sp1_listener);
 	mlxsw_sp->fid_family_arr = mlxsw_sp1_fid_family_arr;
 	mlxsw_sp->lowest_shaper_bs = MLXSW_REG_QEEC_LOWEST_SHAPER_BS_SP1;
+	mlxsw_sp->pgt_smpe_index_valid = true;
 
 	return mlxsw_sp_init(mlxsw_core, mlxsw_bus_info, extack);
 }
@@ -3268,6 +3269,7 @@ static int mlxsw_sp2_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->listeners_count = ARRAY_SIZE(mlxsw_sp2_listener);
 	mlxsw_sp->fid_family_arr = mlxsw_sp2_fid_family_arr;
 	mlxsw_sp->lowest_shaper_bs = MLXSW_REG_QEEC_LOWEST_SHAPER_BS_SP2;
+	mlxsw_sp->pgt_smpe_index_valid = false;
 
 	return mlxsw_sp_init(mlxsw_core, mlxsw_bus_info, extack);
 }
@@ -3301,6 +3303,7 @@ static int mlxsw_sp3_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->listeners_count = ARRAY_SIZE(mlxsw_sp2_listener);
 	mlxsw_sp->fid_family_arr = mlxsw_sp2_fid_family_arr;
 	mlxsw_sp->lowest_shaper_bs = MLXSW_REG_QEEC_LOWEST_SHAPER_BS_SP3;
+	mlxsw_sp->pgt_smpe_index_valid = false;
 
 	return mlxsw_sp_init(mlxsw_core, mlxsw_bus_info, extack);
 }
@@ -3334,6 +3337,7 @@ static int mlxsw_sp4_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->listeners_count = ARRAY_SIZE(mlxsw_sp2_listener);
 	mlxsw_sp->fid_family_arr = mlxsw_sp2_fid_family_arr;
 	mlxsw_sp->lowest_shaper_bs = MLXSW_REG_QEEC_LOWEST_SHAPER_BS_SP4;
+	mlxsw_sp->pgt_smpe_index_valid = false;
 
 	return mlxsw_sp_init(mlxsw_core, mlxsw_bus_info, extack);
 }

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

@@ -219,6 +219,7 @@ struct mlxsw_sp {
 	struct mutex ipv6_addr_ht_lock; /* Protects ipv6_addr_ht */
 	bool ubridge;
 	struct mlxsw_sp_pgt *pgt;
+	bool pgt_smpe_index_valid;
 };
 
 struct mlxsw_sp_ptp_ops {

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

@@ -11,6 +11,7 @@ struct mlxsw_sp_pgt {
 	struct idr pgt_idr;
 	u16 end_index; /* Exclusive. */
 	struct mutex lock; /* Protects PGT. */
+	bool smpe_index_valid;
 };
 
 int mlxsw_sp_pgt_mid_alloc(struct mlxsw_sp *mlxsw_sp, u16 *p_mid)
@@ -107,6 +108,7 @@ int mlxsw_sp_pgt_init(struct mlxsw_sp *mlxsw_sp)
 	idr_init(&pgt->pgt_idr);
 	pgt->end_index = MLXSW_CORE_RES_GET(mlxsw_sp->core, PGT_SIZE);
 	mutex_init(&pgt->lock);
+	pgt->smpe_index_valid = mlxsw_sp->pgt_smpe_index_valid;
 	mlxsw_sp->pgt = pgt;
 	return 0;
 }