On 28.12.2021 15:25, Michael Walle wrote:
Add a helper to add an offset to a ethernet address. This comes in handy
if you have a base ethernet address for multiple interfaces.
Signed-off-by: Michael Walle <michael@xxxxxxxx>
---
include/linux/etherdevice.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index 2ad71cc90b37..9d621dc85290 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -486,6 +486,20 @@ static inline void eth_addr_inc(u8 *addr)
u64_to_ether_addr(u, addr);
}
+/**
+ * eth_addr_add() - Add (or subtract) and offset to/from the given MAC address.
+ *
+ * @offset: Offset to add.
+ * @addr: Pointer to a six-byte array containing Ethernet address to increment.
+ */
+static inline void eth_addr_add(u8 *addr, long offset)
+{
+ u64 u = ether_addr_to_u64(addr);
+
+ u += offset;
+ u64_to_ether_addr(u, addr);
+}
Please check eth_hw_addr_gen() which contains identical code +
eth_hw_addr_set().
You should probably make eth_hw_addr_gen() use your new function as a
helper.
