From 70934c7c99ad01778eef83e898df4c624e52492f Mon Sep 17 00:00:00 2001 From: "Russell King (Oracle)" Date: Thu, 24 Aug 2023 14:37:53 +0100 Subject: [PATCH] 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: Russell King (Oracle) Link: https://lore.kernel.org/r/E1qZAX3-005pTi-K1@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski --- drivers/net/phy/phylink.c | 18 ++++++++++++++++++ include/linux/phylink.h | 2 ++ 2 files changed, 20 insertions(+) diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index 160bce6..0d73549 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -427,6 +427,24 @@ static struct { }; /** + * 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 * @duplex: the duplex to search for diff --git a/include/linux/phylink.h b/include/linux/phylink.h index 789c516..7d07f87 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -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. -- 2.7.4