mlxsw: spectrum: Set SW LAG mode on Spectrum>1

On Spectrum-2, Spectrum-3 and Spectrum-4 machines, request SW
responsibility for placement of the LAG table.

On Spectrum-1, some FW versions claim to support lag_mode field despite
quietly ignoring any settings made to that field. Thus refrain from
attempting to configure lag_mode on those systems at all.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -3597,6 +3597,7 @@ static const struct mlxsw_config_profile mlxsw_sp2_config_profile = {
 	},
 	.used_cqe_time_stamp_type	= 1,
 	.cqe_time_stamp_type		= MLXSW_CMD_MBOX_CONFIG_PROFILE_CQE_TIME_STAMP_TYPE_UTC,
+	.lag_mode_prefer_sw		= true,
 };
 
 /* Reduce number of LAGs from full capacity (256) to the maximum supported LAGs
@@ -3624,6 +3625,7 @@ static const struct mlxsw_config_profile mlxsw_sp4_config_profile = {
 	},
 	.used_cqe_time_stamp_type	= 1,
 	.cqe_time_stamp_type		= MLXSW_CMD_MBOX_CONFIG_PROFILE_CQE_TIME_STAMP_TYPE_UTC,
+	.lag_mode_prefer_sw		= true,
 };
 
 static void