Commit 8040c96b authored by Petr Machata's avatar Petr Machata Committed by David S. Miller
Browse files

mlxsw: spectrum_qdisc: Offload RED ECN nodrop mode 



RED ECN nodrop mode means that non-ECT traffic should not be early-dropped,
but enqueued normally instead. In Spectrum systems, this is achieved by
disabling CWTPM.ew (enable WRED) for a given traffic class.

So far CWTPM.ew was unconditionally enabled. Instead disable it when the
RED qdisc is in nodrop mode.

Signed-off-by: default avatarPetr Machata <petrm@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0a7fad23

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

+5 −4
Original line number Diff line number Diff line
@@ -323,7 +323,7 @@ mlxsw_sp_qdisc_get_tc_stats(struct mlxsw_sp_port *mlxsw_sp_port, 
static int

mlxsw_sp_tclass_congestion_enable(struct mlxsw_sp_port *mlxsw_sp_port,

				  int tclass_num, u32 min, u32 max,

				  u32 probability, bool is_ecn)

				  u32 probability, bool is_wred, bool is_ecn)

{

	char cwtpm_cmd[MLXSW_REG_CWTPM_LEN];

	char cwtp_cmd[MLXSW_REG_CWTP_LEN];
@@ -341,7 +341,7 @@ mlxsw_sp_tclass_congestion_enable(struct mlxsw_sp_port *mlxsw_sp_port, 
		return err;



	mlxsw_reg_cwtpm_pack(cwtpm_cmd, mlxsw_sp_port->local_port, tclass_num,

			     MLXSW_REG_CWTP_DEFAULT_PROFILE, true, is_ecn);

			     MLXSW_REG_CWTP_DEFAULT_PROFILE, is_wred, is_ecn);



	return mlxsw_reg_write(mlxsw_sp->core, MLXSW_REG(cwtpm), cwtpm_cmd);

}
@@ -445,8 +445,9 @@ mlxsw_sp_qdisc_red_replace(struct mlxsw_sp_port *mlxsw_sp_port, u32 handle, 
	prob = DIV_ROUND_UP(prob, 1 << 16);

	min = mlxsw_sp_bytes_cells(mlxsw_sp, p->min);

	max = mlxsw_sp_bytes_cells(mlxsw_sp, p->max);

	return mlxsw_sp_tclass_congestion_enable(mlxsw_sp_port, tclass_num, min,

						 max, prob, p->is_ecn);

	return mlxsw_sp_tclass_congestion_enable(mlxsw_sp_port, tclass_num,

						 min, max, prob,

						 !p->is_nodrop, p->is_ecn);

}



static void

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