1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/net/sfc/mdio_10g.c b/drivers/net/sfc/mdio_10g.c
index 4462fb58a3a9..9f5ec3eb3418 100644
--- a/drivers/net/sfc/mdio_10g.c
+++ b/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)
 {