header: add ether_addr_to_u64() and u64_to_ether_addr()

These function were added in commit 5952758101 ("dsa: mv88e6xxx:
Optimise atu_get") and are now used by mwifiex.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/backport/backport-include/linux/etherdevice.h b/backport/backport-include/linux/etherdevice.h
index 92256e00516930c213d700dadd7fe3bfcae1006c..a00e66608eae6d38283a9db91b313d83aa17dc8b 100644 (file)
--- a/backport/backport-include/linux/etherdevice.h
+++ b/backport/backport-include/linux/etherdevice.h
@@ -193,4 +193,38 @@ static inline int eth_skb_pad(struct sk_buff *skb)
 }
 #endif /* LINUX_VERSION_IS_LESS(3,19,0) */
 
+#if LINUX_VERSION_IS_LESS(4,11,0)
+/**
+ * ether_addr_to_u64 - Convert an Ethernet address into a u64 value.
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Return a u64 value of the address
+ */
+static inline u64 ether_addr_to_u64(const u8 *addr)
+{
+       u64 u = 0;
+       int i;
+
+       for (i = 0; i < ETH_ALEN; i++)
+               u = u << 8 | addr[i];
+
+       return u;
+}
+
+/**
+ * u64_to_ether_addr - Convert a u64 to an Ethernet address.
+ * @u: u64 to convert to an Ethernet MAC address
+ * @addr: Pointer to a six-byte array to contain the Ethernet address
+ */
+static inline void u64_to_ether_addr(u64 u, u8 *addr)
+{
+       int i;
+
+       for (i = ETH_ALEN - 1; i >= 0; i--) {
+               addr[i] = u & 0xff;
+               u = u >> 8;
+       }
+}
+#endif /* LINUX_VERSION_IS_LESS(4,11,0) */
+
 #endif /* _BACKPORT_LINUX_ETHERDEVICE_H */