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authorRussell King (Oracle) <rmk+kernel@armlinux.org.uk>2023-08-24 14:37:53 +0100
committerJakub Kicinski <kuba@kernel.org>2023-08-25 18:55:18 -0700
commit70934c7c99ad01778eef83e898df4c624e52492f (patch)
tree022785dd5b3da29c579b2d975d785f6dcd449b43
parent215eb9f962091ebaab96be2c18cf5d0f5174a4d6 (diff)
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) <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>
-rw-r--r--drivers/net/phy/phylink.c18
-rw-r--r--include/linux/phylink.h2
2 files changed, 20 insertions, 0 deletions
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 160bce608c34..0d7354955d62 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 789c516c6b4a..7d07f8736431 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.