Messages in this thread Patch in this message | | | From | Sean Anderson <> | Subject | [PATCH net-next v4 05/10] net: phylink: Add some helpers for working with mac caps | Date | Thu, 18 Aug 2022 12:46:11 -0400 |
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This adds a table for converting between speed/duplex and mac capabilities. It also adds a helper for getting the max speed/duplex from some caps. It is intended to be used by Russell King's DSA phylink series. The table will be used directly later in this series.
Co-developed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> [ adapted to live in phylink.c ] Signed-off-by: Sean Anderson <sean.anderson@seco.com> --- This is adapted from [1].
[1] https://lore.kernel.org/netdev/E1oCNlE-006e3z-3T@rmk-PC.armlinux.org.uk/
Changes in v4: - Wrap docstring to 80 columns
Changes in v3: - New
drivers/net/phy/phylink.c | 57 +++++++++++++++++++++++++++++++++++++++ include/linux/phylink.h | 2 ++ 2 files changed, 59 insertions(+)
diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c index 68a58ab6a8ed..8a9da7449c73 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -304,6 +304,63 @@ void phylink_caps_to_linkmodes(unsigned long *linkmodes, unsigned long caps) } EXPORT_SYMBOL_GPL(phylink_caps_to_linkmodes); +static struct { + unsigned long mask; + int speed; + unsigned int duplex; +} phylink_caps_params[] = { + { MAC_400000FD, SPEED_400000, DUPLEX_FULL }, + { MAC_200000FD, SPEED_200000, DUPLEX_FULL }, + { MAC_100000FD, SPEED_100000, DUPLEX_FULL }, + { MAC_56000FD, SPEED_56000, DUPLEX_FULL }, + { MAC_50000FD, SPEED_50000, DUPLEX_FULL }, + { MAC_40000FD, SPEED_40000, DUPLEX_FULL }, + { MAC_25000FD, SPEED_25000, DUPLEX_FULL }, + { MAC_20000FD, SPEED_20000, DUPLEX_FULL }, + { MAC_10000FD, SPEED_10000, DUPLEX_FULL }, + { MAC_5000FD, SPEED_5000, DUPLEX_FULL }, + { MAC_2500FD, SPEED_2500, DUPLEX_FULL }, + { MAC_1000FD, SPEED_1000, DUPLEX_FULL }, + { MAC_1000HD, SPEED_1000, DUPLEX_HALF }, + { MAC_100FD, SPEED_100, DUPLEX_FULL }, + { MAC_100HD, SPEED_100, DUPLEX_HALF }, + { MAC_10FD, SPEED_10, DUPLEX_FULL }, + { MAC_10HD, SPEED_10, DUPLEX_HALF }, +}; + +/** + * phylink_caps_find_max_speed() - Find the max speed/duplex of mac capabilities + * @caps: A mask of mac capabilities + * @speed: Variable to store the maximum speed + * @duplex: Variable to store the maximum duplex + * + * Find the maximum speed (and associated duplex) supported by a mask of mac + * capabilities. @speed and @duplex are always set, even if no matching mac + * capability was found. + * + * Return: 0 on success, or %-EINVAL if the maximum speed/duplex could not be + * determined. + */ +int phylink_caps_find_max_speed(unsigned long caps, int *speed, + unsigned int *duplex) +{ + int i; + + *speed = SPEED_UNKNOWN; + *duplex = DUPLEX_UNKNOWN; + + for (i = 0; i < ARRAY_SIZE(phylink_caps_params); i++) { + if (caps & phylink_caps_params[i].mask) { + *speed = phylink_caps_params[i].speed; + *duplex = phylink_caps_params[i].duplex; + return 0; + } + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(phylink_caps_find_max_speed); + /** * phylink_get_capabilities() - get capabilities for a given MAC * @interface: phy interface mode defined by &typedef phy_interface_t diff --git a/include/linux/phylink.h b/include/linux/phylink.h index 661d1d4fdbec..a5a236cfacb6 100644 --- a/include/linux/phylink.h +++ b/include/linux/phylink.h @@ -535,6 +535,8 @@ void pcs_link_up(struct phylink_pcs *pcs, unsigned int mode, #endif void phylink_caps_to_linkmodes(unsigned long *linkmodes, unsigned long caps); +int phylink_caps_find_max_speed(unsigned long caps, int *speed, + unsigned int *duplex); unsigned long phylink_get_capabilities(phy_interface_t interface, unsigned long mac_capabilities); void phylink_generic_validate(struct phylink_config *config, -- 2.35.1.1320.gc452695387.dirty
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