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mlxsw: core: Add validation of transceiver temperature thresholds 

[ Upstream commit 57726ebe27 ]

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 a rare scenario, but it was observed at a customer site.

Fixes: 6a79507cfe ("mlxsw: core: Extend thermal module with per QSFP module thermal zones")
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Vadim Pasternak 2021-01-08 16:52:09 +02:00 committed by Greg Kroah-Hartman
parent ff6d4e8da7
commit 7680783452
1 changed files with 7 additions and 4 deletions
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11
drivers/net/ethernet/mellanox/mlxsw/core_thermal.c
View File

@ -177,6 +177,12 @@ 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"
@ -191,11 +197,8 @@ 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;
}