[mellanox]: Backport patches to increase critical threshold for ASIC and validate transceiver temperature (#185)

Backport new patches to increase the ASIC critical threshold from 110C to 140C, and validate the transceiver critical threshold temperature:

1. 0022-mlxsw-core-Increase-critical-threshold-for-ASIC-ther.patch   torvalds/linux@b06ca3d
2. 0023-mlxsw-core-Add-validation-of-transceiver-temperature.patch  torvalds/linux@57726eb

This change has been verified on all Mellanox devices based on Spectrum-1, Spectrum-2, and Spectrum-3 ASIC

Signed-off-by: Kebo Liu <kebol@nvidia.com>

Author: keboliu

patch/0022-mlxsw-core-Increase-critical-threshold-for-ASIC-ther.patch

@@ -0,0 +1,42 @@
+From f79a25e99568d19ed2cd39de4650ced66de4ab5d Mon Sep 17 00:00:00 2001
+From: Vadim Pasternak <vadimp@nvidia.com>
+Date: Thu, 31 Dec 2020 19:27:02 +0200
+Subject: [PATCH mlxsw/net-next 1/1] mlxsw: core: Increase critical threshold
+ for ASIC thermal zone
+
+Increase critical threshold for ASIC thermal zone from 110C to 140C
+according to the system hardware requirements. All the supported ASICs
+(SX, Spectrum1, Spectune2, Spectrum3) could be still operational with
+ASIC temperature below 140C.
+
+According to the system requirements software thermal protection is the
+second level of protection, while the first level of protection should
+be performed by firmware. So firmware could decide to perform system
+thermal shutdown in case the temperature is below 140C. So firmware can
+decide to perform system thermal shutdown in case the temperature is
+below 140C. In case firmware did not perform it and ASIC temperature
+reached 140C, the second level of thermal protection will be performed
+by software.
+
+Fixes: 41e760841d26 ("mlxsw: core: Replace thermal temperature trips with defines")
+Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
+---
+ drivers/net/ethernet/mellanox/mlxsw/core_thermal.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+index 141e3655e211..d575aa469517 100644
+--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
++++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+@@ -19,7 +19,7 @@
+ #define MLXSW_THERMAL_ASIC_TEMP_NORM	75000	/* 75C */
+ #define MLXSW_THERMAL_ASIC_TEMP_HIGH	85000	/* 85C */
+ #define MLXSW_THERMAL_ASIC_TEMP_HOT	105000	/* 105C */
+-#define MLXSW_THERMAL_ASIC_TEMP_CRIT	110000	/* 110C */
++#define MLXSW_THERMAL_ASIC_TEMP_CRIT	140000	/* 140C */
+ #define MLXSW_THERMAL_MODULE_TEMP_NORM	60000	/* 60C */
+ #define MLXSW_THERMAL_MODULE_TEMP_HIGH	70000	/* 70C */
+ #define MLXSW_THERMAL_MODULE_TEMP_HOT	80000	/* 80C */
+-- 
+2.11.0
+

patch/0023-mlxsw-core-Add-validation-of-transceiver-temperature.patch

@@ -0,0 +1,54 @@
+From 8845c46138eca323a3fe9cd1332190f092f35888 Mon Sep 17 00:00:00 2001
+From: Vadim Pasternak <vadimp@nvidia.com>
+Date: Thu, 7 Jan 2021 12:56:21 +0200
+Subject: [PATCH mlxsw/backport 2/2] mlxsw: core: Add validation of transceiver
+ temperature thresholds
+
+Validate thresholds to avoid a single failure due to some transceiver
+unreliability. Ignore the last readouts in case warning temperature is
+above alarm temperature, since it can cause unexpected thermal
+shutdown. Stay with the previous values and refresh threshold within
+the next iteration.
+
+This is the rare scenario, but somehow once it has been observed at a
+customer site.
+
+Fixes: 6a79507cfe94 ("mlxsw: core: Extend thermal module with per QSFP module thermal zones")
+Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
+---
+ drivers/net/ethernet/mellanox/mlxsw/core_thermal.c | 11 +++++++----
+ 1 file changed, 7 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+index 54d0e8b8d..477c3ed53 100644
+--- a/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
++++ b/drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
+@@ -183,6 +183,12 @@ mlxsw_thermal_module_trips_update(struct device *dev, struct mlxsw_core *core,
+ 	if (err)
+ 		return err;
+ 
++	if (crit_temp > emerg_temp) {
++		dev_warn(dev, "%s : Critical threshold %d is above emergency threshold %d\n",
++			 tz->tzdev->type, crit_temp, emerg_temp);
++		return 0;
++	}
++
+ 	/* According to the system thermal requirements, the thermal zones are
+ 	 * defined with four trip points. The critical and emergency
+ 	 * temperature thresholds, provided by QSFP module are set as "active"
+@@ -197,11 +203,8 @@ mlxsw_thermal_module_trips_update(struct device *dev, struct mlxsw_core *core,
+ 		tz->trips[MLXSW_THERMAL_TEMP_TRIP_NORM].temp = crit_temp;
+ 	tz->trips[MLXSW_THERMAL_TEMP_TRIP_HIGH].temp = crit_temp;
+ 	tz->trips[MLXSW_THERMAL_TEMP_TRIP_HOT].temp = emerg_temp;
+-	if (emerg_temp > crit_temp)
+-		tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = emerg_temp +
++	tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = emerg_temp +
+ 					MLXSW_THERMAL_MODULE_TEMP_SHIFT;
+-	else
+-		tz->trips[MLXSW_THERMAL_TEMP_TRIP_CRIT].temp = emerg_temp;
+ 
+ 	return 0;
+ }
+-- 
+2.11.0
+

patch/series

@@ -70,6 +70,8 @@ driver-ixgbe-external-phy.patch
 0019-mlxsw-i2c-Allow-flexible-setting-of-I2C-transactions.patch
 0020-mlxsw-core-Set-different-thermal-polling-time-based.patch
 0021-platform-x86-mlx-platform-Remove-PSU-EEPROM-configur.patch
+0022-mlxsw-core-Increase-critical-threshold-for-ASIC-ther.patch
+0023-mlxsw-core-Add-validation-of-transceiver-temperature.patch
 ############################################################
 #
 # Internal patches will be added below (placeholder)