sfc: Fix reporting of PHY id

Shuffle bits of the OUI into the conventional written order.

Replace PHY id component macros with functions.

Zero-pad PHY id components in log messages.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sfc/mdio_10g.c

@@ -17,6 +17,21 @@
 #include "boards.h"
 #include "workarounds.h"
 
+unsigned mdio_id_oui(u32 id)
+{
+	unsigned oui = 0;
+	int i;
+
+	/* The bits of the OUI are designated a..x, with a=0 and b variable.
+	 * In the id register c is the MSB but the OUI is conventionally
+	 * written as bytes h..a, p..i, x..q.  Reorder the bits accordingly. */
+	for (i = 0; i < 22; ++i)
+		if (id & (1 << (i + 10)))
+			oui |= 1 << (i ^ 7);
+
+	return oui;
+}
+
 int mdio_clause45_reset_mmd(struct efx_nic *port, int mmd,
 			    int spins, int spintime)
 {

drivers/net/sfc/mdio_10g.h

@@ -70,10 +70,10 @@
 #define MDIO_MMDREG_STAT1_LPABLE_LBN	(1)
 #define MDIO_MMDREG_STAT1_LPABLE_WIDTH	(1)
 
-/* Bits in ID reg */
-#define MDIO_ID_REV(_id32)	(_id32 & 0xf)
-#define MDIO_ID_MODEL(_id32)	((_id32 >> 4) & 0x3f)
-#define MDIO_ID_OUI(_id32)	(_id32 >> 10)
+/* Bits in combined ID regs */
+static inline unsigned mdio_id_rev(u32 id) { return id & 0xf; }
+static inline unsigned mdio_id_model(u32 id) { return (id >> 4) & 0x3f; }
+extern unsigned mdio_id_oui(u32 id);
 
 /* Bits in MMDREG_DEVS0/1. Someone thoughtfully layed things out
  * so the 'bit present' bit number of an MMD is the number of

drivers/net/sfc/xfp_phy.c

@@ -88,9 +88,9 @@ static int xfp_phy_init(struct efx_nic *efx)
 		return -ENOMEM;
 	efx->phy_data = phy_data;
 
-	EFX_INFO(efx, "PHY ID reg %x (OUI %x model %x revision %x)\n",
-		 devid, MDIO_ID_OUI(devid), MDIO_ID_MODEL(devid),
-		 MDIO_ID_REV(devid));
+	EFX_INFO(efx, "PHY ID reg %x (OUI %06x model %02x revision %x)\n",
+		 devid, mdio_id_oui(devid), mdio_id_model(devid),
+		 mdio_id_rev(devid));
 
 	phy_data->phy_mode = efx->phy_mode;