Commit 70934c7c authored by Russell King (Oracle)'s avatar Russell King (Oracle) Committed by Jakub Kicinski
Browse files

net: phylink: add phylink_limit_mac_speed() 



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

Signed-off-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/E1qZAX3-005pTi-K1@rmk-PC.armlinux.org.uk


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 215eb9f9

drivers/net/phy/phylink.c

+18 −0
Original line number Diff line number Diff line
@@ -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

include/linux/phylink.h

+2 −0
Original line number Diff line number Diff line
@@ -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.