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Date: Fri, 23 Dec 2011 14:01:07 +0100
From: Francois Romieu <romieu@...zoreil.com>
To: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc: davem@...emloft.net, Don Skidmore <donald.c.skidmore@...el.com>,
netdev@...r.kernel.org, gospo@...hat.com, sassmann@...hat.com,
Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [net-next 7/9] ixgbe: add support functions for gathering thermal data sensor
Jeff Kirsher <jeffrey.t.kirsher@...el.com> :
> From: Don Skidmore <donald.c.skidmore@...el.com>
>
> Some 82599 adapters contain thermal data that we can get to via
> an i2c interface. These functions provide support to get at that
> data. A following patch will export this data.
>
> Signed-off-by: Don Skidmore <donald.c.skidmore@...el.com>
> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
> Tested-by: Stephen Ko <stephen.s.ko@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> ---
> drivers/net/ethernet/intel/ixgbe/ixgbe_common.c | 150 +++++++++++++++++++++++
> drivers/net/ethernet/intel/ixgbe/ixgbe_common.h | 13 ++
> drivers/net/ethernet/intel/ixgbe/ixgbe_type.h | 38 ++++++
> 3 files changed, 201 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
> index a3aa633..05aa156 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
> @@ -3526,3 +3526,153 @@ void ixgbe_clear_tx_pending(struct ixgbe_hw *hw)
> IXGBE_WRITE_REG(hw, IXGBE_GCR_EXT, gcr_ext);
> IXGBE_WRITE_REG(hw, IXGBE_HLREG0, hlreg0);
> }
> +
> +static const u8 ixgbe_emc_temp_data[4] = {
> + IXGBE_EMC_INTERNAL_DATA,
> + IXGBE_EMC_DIODE1_DATA,
> + IXGBE_EMC_DIODE2_DATA,
> + IXGBE_EMC_DIODE3_DATA
> +};
> +static const u8 ixgbe_emc_therm_limit[4] = {
> + IXGBE_EMC_INTERNAL_THERM_LIMIT,
> + IXGBE_EMC_DIODE1_THERM_LIMIT,
> + IXGBE_EMC_DIODE2_THERM_LIMIT,
> + IXGBE_EMC_DIODE3_THERM_LIMIT
> +};
> +
> +/**
> + * ixgbe_get_thermal_sensor_data - Gathers thermal sensor data
> + * @hw: pointer to hardware structure
> + * @data: pointer to the thermal sensor data structure
> + *
> + * Returns the thermal sensor data structure
> + **/
> +s32 ixgbe_get_thermal_sensor_data_generic(struct ixgbe_hw *hw)
> +{
> + s32 status = 0;
> + u16 ets_offset;
> + u16 ets_cfg;
> + u16 ets_sensor;
> + u8 num_sensors;
> + u8 sensor_index;
> + u8 sensor_location;
> + u8 i;
> + struct ixgbe_thermal_sensor_data *data = &hw->mac.thermal_sensor_data;
> +
> + /* Only support thermal sensors attached to 82599 physical port 0 */
> + if ((hw->mac.type != ixgbe_mac_82599EB) ||
> + (IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_LAN_ID_1)) {
> + status = IXGBE_NOT_IMPLEMENTED;
While defined, IXGBE_NOT_IMPLEMENTED is currently unused in both davem-next
and the remaining patches of this series. Can't you remove it completely and
use a standard error code, say -EOPNOTSUPP ?
> + goto out;
> + }
> +
> + status = hw->eeprom.ops.read(hw, IXGBE_ETS_CFG, &ets_offset);
> + if (status)
> + goto out;
> +
> + if ((ets_offset == 0x0000) || (ets_offset == 0xFFFF)) {
> + status = IXGBE_NOT_IMPLEMENTED;
> + goto out;
> + }
> +
> + status = hw->eeprom.ops.read(hw, ets_offset, &ets_cfg);
> + if (status)
> + goto out;
> +
> + if (((ets_cfg & IXGBE_ETS_TYPE_MASK) >> IXGBE_ETS_TYPE_SHIFT)
> + != IXGBE_ETS_TYPE_EMC) {
^^ -> should appear in the previous line
> + status = IXGBE_NOT_IMPLEMENTED;
> + goto out;
> + }
> +
> + num_sensors = (ets_cfg & IXGBE_ETS_NUM_SENSORS_MASK);
> + if (num_sensors > IXGBE_MAX_SENSORS)
> + num_sensors = IXGBE_MAX_SENSORS;
ets_cfg is not used beyond this point and most of this code is duplicated
in ixgbe_init_thermal_sensor_thresh_generic.
You may refactor the code with xyz_get_ets_offset() and xyz_get_num_sensors()
methods, add some eth_type local variable and avoid the duplication while
keeping the lines short.
> +
> + for (i = 0; i < num_sensors; i++) {
sensor_index and sensor_location should be declared here.
> + status = hw->eeprom.ops.read(hw, (ets_offset + 1 + i),
> + &ets_sensor);
> + if (status)
> + goto out;
> +
> + sensor_index = ((ets_sensor & IXGBE_ETS_DATA_INDEX_MASK) >>
> + IXGBE_ETS_DATA_INDEX_SHIFT);
> + sensor_location = ((ets_sensor & IXGBE_ETS_DATA_LOC_MASK) >>
> + IXGBE_ETS_DATA_LOC_SHIFT);
> +
> + if (sensor_location != 0) {
> + status = hw->phy.ops.read_i2c_byte(hw,
> + ixgbe_emc_temp_data[sensor_index],
> + IXGBE_I2C_THERMAL_SENSOR_ADDR,
> + &data->sensor[i].temp);
> + if (status)
> + goto out;
> + }
Broken indentation.
> + }
> +out:
> + return status;
> +}
> +
> +/**
> + * ixgbe_init_thermal_sensor_thresh_generic - Inits thermal sensor thresholds
> + * @hw: pointer to hardware structure
> + *
> + * Inits the thermal sensor thresholds according to the NVM map
> + * and save off the threshold and location values into mac.thermal_sensor_data
> + **/
> +s32 ixgbe_init_thermal_sensor_thresh_generic(struct ixgbe_hw *hw)
> +{
> + s32 status = 0;
> + u16 ets_offset;
> + u16 ets_cfg;
> + u16 ets_sensor;
> + u8 low_thresh_delta;
> + u8 num_sensors;
> + u8 sensor_index;
> + u8 sensor_location;
> + u8 therm_limit;
> + u8 i;
> + struct ixgbe_thermal_sensor_data *data = &hw->mac.thermal_sensor_data;
> +
> + memset(data, 0, sizeof(struct ixgbe_thermal_sensor_data));
> +
> + /* Only support thermal sensors attached to 82599 physical port 0 */
> + if ((hw->mac.type != ixgbe_mac_82599EB) ||
> + (IXGBE_READ_REG(hw, IXGBE_STATUS) & IXGBE_STATUS_LAN_ID_1))
> + return IXGBE_NOT_IMPLEMENTED;
> +
> + hw->eeprom.ops.read(hw, IXGBE_ETS_CFG, &ets_offset);
> + if ((ets_offset == 0x0000) || (ets_offset == 0xFFFF))
> + return IXGBE_NOT_IMPLEMENTED;
> +
> + hw->eeprom.ops.read(hw, ets_offset, &ets_cfg);
> + if (((ets_cfg & IXGBE_ETS_TYPE_MASK) >> IXGBE_ETS_TYPE_SHIFT)
> + != IXGBE_ETS_TYPE_EMC)
^^ sic
> + return IXGBE_NOT_IMPLEMENTED;
> +
> + low_thresh_delta = ((ets_cfg & IXGBE_ETS_LTHRES_DELTA_MASK) >>
> + IXGBE_ETS_LTHRES_DELTA_SHIFT);
> + num_sensors = (ets_cfg & IXGBE_ETS_NUM_SENSORS_MASK);
> +
> + for (i = 0; i < num_sensors; i++) {
> + hw->eeprom.ops.read(hw, (ets_offset + 1 + i), &ets_sensor);
> + sensor_index = ((ets_sensor & IXGBE_ETS_DATA_INDEX_MASK) >>
> + IXGBE_ETS_DATA_INDEX_SHIFT);
> + sensor_location = ((ets_sensor & IXGBE_ETS_DATA_LOC_MASK) >>
> + IXGBE_ETS_DATA_LOC_SHIFT);
> + therm_limit = ets_sensor & IXGBE_ETS_DATA_HTHRESH_MASK;
> +
> + hw->phy.ops.write_i2c_byte(hw,
> + ixgbe_emc_therm_limit[sensor_index],
> + IXGBE_I2C_THERMAL_SENSOR_ADDR, therm_limit);
> +
> + if ((i < IXGBE_MAX_SENSORS) && (sensor_location != 0)) {
The patch would be easier to review if num_sensors was capped as in
ixgbe_get_thermal_sensor_data_generic...
> + data->sensor[i].location = sensor_location;
> + data->sensor[i].caution_thresh = therm_limit;
> + data->sensor[i].max_op_thresh = therm_limit -
> + low_thresh_delta;
... and the code would gain an extra tab level, thus avoiding the line
break if there was a 'continue' statement when sensor_location fails the
test.
--
Ueimor
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