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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: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2020-03-13 01:10:58 +02:00 committed by David S. Miller
parent 0a7fad2376
commit 8040c96b4f
1 changed files with 5 additions and 4 deletions
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9
drivers/net/ethernet/mellanox/mlxsw/spectrum_qdisc.c
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@ -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