mlxsw: spectrum: Use CFF mode where available

Mark all Spectrum>2 systems as preferring CFF flood mode if supported by
the firmware.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/8a3d2ad96b943f7e3f53f998bd333a14e19cd641.1701183892.git.petrm@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -3598,6 +3598,7 @@ 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,
+	.flood_mode_prefer_cff		= true,
 };
 
 /* Reduce number of LAGs from full capacity (256) to the maximum supported LAGs
@@ -3626,6 +3627,7 @@ 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,
+	.flood_mode_prefer_cff		= true,
 };
 
 static void