netdev - [PATCH net-next v2 4/6] mlxsw: spectrum_qdisc: Offload RED ECN tail-dropping mode

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Message-Id: <20200311173356.38181-5-petrm@mellanox.com>
Date:   Wed, 11 Mar 2020 19:33:54 +0200
From:   Petr Machata <petrm@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     Petr Machata <petrm@...lanox.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Roman Mashak <mrv@...atatu.com>, jhs@...atatu.com,
        xiyou.wangcong@...il.com, davem@...emloft.net, jiri@...lanox.com,
        mlxsw@...lanox.com, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH net-next v2 4/6] mlxsw: spectrum_qdisc: Offload RED ECN tail-dropping mode

RED ECN tail-dropping 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 taildrop mode.

Signed-off-by: Petr Machata <petrm@...lanox.com>
Reviewed-by: Ido Schimmel <idosch@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
index b9f429ec0db4..dee89298122c 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
@@ -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_taildrop, p->is_ecn);
 }
 
 static void
-- 
2.20.1