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net: pse-pd: Add new power limit get and set c33 features

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This patch add a way to get and set the power limit of a PSE PI.
For that it uses regulator API callbacks wrapper like get_voltage() and
get/set_current_limit() as power is simply V * I.
We used mW unit as defined by the IEEE 802.3-2022 standards.

set_current_limit() uses the voltage return by get_voltage() and the
desired power limit to calculate the current limit. get_voltage() callback
is then mandatory to set the power limit.

get_current_limit() callback is by default looking at a driver callback
and fallback to extracting the current limit from _pse_ethtool_get_status()
if the driver does not set its callback. We prefer let the user the choice
because ethtool_get_status return much more information than the current
limit.

expand pse status with c33_pw_limit_ranges to return the ranges available
to configure the power limit.

Reviewed-by: Sai Krishna <saikrishnag@marvell.com>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20240704-feature_poe_power_cap-v6-4-320003204264@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kory Maincent (Dent Project)
2024-07-04 10:11:59 +02:00
committed by Jakub Kicinski
parent ae37dc5742
commit 4a83abcef5
2 changed files with 204 additions and 11 deletions
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43
include/linux/pse-pd/pse.h
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@@ -9,6 +9,9 @@
#include <linux/list.h>
#include <uapi/linux/ethtool.h>
/* Maximum current in uA according to IEEE 802.3-2022 Table 145-1 */
#define MAX_PI_CURRENT 1920000
struct phy_device;
struct pse_controller_dev;
@@ -41,6 +44,12 @@ struct pse_control_config {
* @c33_actual_pw: power currently delivered by the PSE in mW
* IEEE 802.3-2022 30.9.1.1.23 aPSEActualPower
* @c33_ext_state_info: extended state information of the PSE
* @c33_avail_pw_limit: available power limit of the PSE in mW
* IEEE 802.3-2022 145.2.5.4 pse_avail_pwr
* @c33_pw_limit_ranges: supported power limit configuration range. The driver
* is in charge of the memory allocation.
* @c33_pw_limit_nb_ranges: number of supported power limit configuration
* ranges
*/
struct pse_control_status {
enum ethtool_podl_pse_admin_state podl_admin_state;
@@ -50,6 +59,9 @@ struct pse_control_status {
u32 c33_pw_class;
u32 c33_actual_pw;
struct ethtool_c33_pse_ext_state_info c33_ext_state_info;
u32 c33_avail_pw_limit;
struct ethtool_c33_pse_pw_limit_range *c33_pw_limit_ranges;
u32 c33_pw_limit_nb_ranges;
};
/**
@@ -61,6 +73,14 @@ struct pse_control_status {
* May also return negative errno.
* @pi_enable: Configure the PSE PI as enabled.
* @pi_disable: Configure the PSE PI as disabled.
* @pi_get_voltage: Return voltage similarly to get_voltage regulator
* callback.
* @pi_get_current_limit: Get the configured current limit similarly to
* get_current_limit regulator callback.
* @pi_set_current_limit: Configure the current limit similarly to
* set_current_limit regulator callback.
* Should not return an error in case of MAX_PI_CURRENT
* current value set.
*/
struct pse_controller_ops {
int (*ethtool_get_status)(struct pse_controller_dev *pcdev,
@@ -70,6 +90,11 @@ struct pse_controller_ops {
int (*pi_is_enabled)(struct pse_controller_dev *pcdev, int id);
int (*pi_enable)(struct pse_controller_dev *pcdev, int id);
int (*pi_disable)(struct pse_controller_dev *pcdev, int id);
int (*pi_get_voltage)(struct pse_controller_dev *pcdev, int id);
int (*pi_get_current_limit)(struct pse_controller_dev *pcdev,
int id);
int (*pi_set_current_limit)(struct pse_controller_dev *pcdev,
int id, int max_uA);
};
struct module;
@@ -156,6 +181,11 @@ int pse_ethtool_get_status(struct pse_control *psec,
int pse_ethtool_set_config(struct pse_control *psec,
struct netlink_ext_ack *extack,
const struct pse_control_config *config);
int pse_ethtool_set_pw_limit(struct pse_control *psec,
struct netlink_ext_ack *extack,
const unsigned int pw_limit);
int pse_ethtool_get_pw_limit(struct pse_control *psec,
struct netlink_ext_ack *extack);
bool pse_has_podl(struct pse_control *psec);
bool pse_has_c33(struct pse_control *psec);
@@ -185,6 +215,19 @@ static inline int pse_ethtool_set_config(struct pse_control *psec,
return -EOPNOTSUPP;
}
static inline int pse_ethtool_set_pw_limit(struct pse_control *psec,
struct netlink_ext_ack *extack,
const unsigned int pw_limit)
{
return -EOPNOTSUPP;
}
static inline int pse_ethtool_get_pw_limit(struct pse_control *psec,
struct netlink_ext_ack *extack)
{
return -EOPNOTSUPP;
}
static inline bool pse_has_podl(struct pse_control *psec)
{
return false;