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Subject[PATCH v3 06/11] net: phylink: Add some helpers for working with mac caps
Date
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: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
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 v3:
- New

drivers/net/phy/phylink.c | 56 +++++++++++++++++++++++++++++++++++++++
include/linux/phylink.h | 2 ++
2 files changed, 58 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 68a58ab6a8ed..72bf6b607320 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -304,6 +304,62 @@ 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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