netdev - [PATCH net-next 2/6] mlxsw: reg: Extend mirroring registers with probability rate field

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Date:   Thu, 11 Mar 2021 14:24:12 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 2/6] mlxsw: reg: Extend mirroring registers with probability rate field

From: Ido Schimmel <idosch@...dia.com>

The MPAR and MPAGR registers are used to configure the binding between
the mirroring trigger (e.g., received packet) and the SPAN agent. Add
probability rate field, which will allow us to support sampling by
mirroring to the CPU.

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/reg.h       | 17 ++++++++++++++++-
 .../net/ethernet/mellanox/mlxsw/spectrum_span.c |  2 +-
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/reg.h b/drivers/net/ethernet/mellanox/mlxsw/reg.h
index 2f7f691f85ff..44f836246e33 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/reg.h
+++ b/drivers/net/ethernet/mellanox/mlxsw/reg.h
@@ -9925,15 +9925,28 @@ MLXSW_ITEM32(reg, mpar, enable, 0x04, 31, 1);
  */
 MLXSW_ITEM32(reg, mpar, pa_id, 0x04, 0, 4);
 
+#define MLXSW_REG_MPAR_RATE_MAX 3500000000UL
+
+/* reg_mpar_probability_rate
+ * Sampling rate.
+ * Valid values are: 1 to 3.5*10^9
+ * Value of 1 means "sample all". Default is 1.
+ * Reserved when Spectrum-1.
+ * Access: RW
+ */
+MLXSW_ITEM32(reg, mpar, probability_rate, 0x08, 0, 32);
+
 static inline void mlxsw_reg_mpar_pack(char *payload, u8 local_port,
 				       enum mlxsw_reg_mpar_i_e i_e,
-				       bool enable, u8 pa_id)
+				       bool enable, u8 pa_id,
+				       u32 probability_rate)
 {
 	MLXSW_REG_ZERO(mpar, payload);
 	mlxsw_reg_mpar_local_port_set(payload, local_port);
 	mlxsw_reg_mpar_enable_set(payload, enable);
 	mlxsw_reg_mpar_i_e_set(payload, i_e);
 	mlxsw_reg_mpar_pa_id_set(payload, pa_id);
+	mlxsw_reg_mpar_probability_rate_set(payload, probability_rate);
 }
 
 /* MGIR - Management General Information Register
@@ -10577,6 +10590,8 @@ MLXSW_ITEM32(reg, mpagr, trigger, 0x00, 0, 4);
  */
 MLXSW_ITEM32(reg, mpagr, pa_id, 0x04, 0, 4);
 
+#define MLXSW_REG_MPAGR_RATE_MAX 3500000000UL
+
 /* reg_mpagr_probability_rate
  * Sampling rate.
  * Valid values are: 1 to 3.5*10^9
diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
index 3287211819df..7711ace07ec8 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c
@@ -1232,7 +1232,7 @@ __mlxsw_sp_span_trigger_port_bind(struct mlxsw_sp_span *span,
 	}
 
 	mlxsw_reg_mpar_pack(mpar_pl, trigger_entry->local_port, i_e, enable,
-			    trigger_entry->parms.span_id);
+			    trigger_entry->parms.span_id, 1);
 	return mlxsw_reg_write(span->mlxsw_sp->core, MLXSW_REG(mpar), mpar_pl);
 }
 
-- 
2.29.2