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net: phylink: add phylink_limit_mac_speed()

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Add a function which can be used to limit the phylink MAC capabilities
to an upper speed limit.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/E1qZAX3-005pTi-K1@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle) 2023-08-24 14:37:53 +01:00 committed by Jakub Kicinski
parent 215eb9f962
commit 70934c7c99
2 changed files with 20 additions and 0 deletions
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18
drivers/net/phy/phylink.c
View File

@ -426,6 +426,24 @@ static struct {
{ MAC_10HD, SPEED_10, DUPLEX_HALF },
};
/**
* phylink_limit_mac_speed - limit the phylink_config to a maximum speed
* @config: pointer to a &struct phylink_config
* @max_speed: maximum speed
*
* Mask off MAC capabilities for speeds higher than the @max_speed parameter.
* Any further motifications of config.mac_capabilities will override this.
*/
void phylink_limit_mac_speed(struct phylink_config *config, u32 max_speed)
{
int i;
for (i = 0; i < ARRAY_SIZE(phylink_caps_params) &&
phylink_caps_params[i].speed > max_speed; i++)
config->mac_capabilities &= ~phylink_caps_params[i].mask;
}
EXPORT_SYMBOL_GPL(phylink_limit_mac_speed);
/**
* phylink_cap_from_speed_duplex - Get mac capability from speed/duplex
* @speed: the speed to search for

2
include/linux/phylink.h
View File

@ -223,6 +223,8 @@ struct phylink_config {
unsigned long mac_capabilities;
};
void phylink_limit_mac_speed(struct phylink_config *config, u32 max_speed);
/**
* struct phylink_mac_ops - MAC operations structure.
* @validate: Validate and update the link configuration.