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authorMichael Walle <michael@walle.cc>2023-02-06 16:43:42 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-02-06 21:06:58 +0300
commit7390609b0121a1b982c5ecdfcd72dc328e5784ee (patch)
tree4f7f5f432ac9543a85a70a2bf3d725bbe5b63d62 /include/linux/etherdevice.h
parent2e8dc541ae207349b51c65391be625ffe1f86e0c (diff)
downloadlinux-7390609b0121a1b982c5ecdfcd72dc328e5784ee.tar.xz
net: add helper eth_addr_add()
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@walle.cc> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Acked-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20230206134356.839737-9-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/etherdevice.h')
-rw-r--r--include/linux/etherdevice.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index a541f0c4f146..224645f17c33 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -508,6 +508,20 @@ static inline void eth_addr_inc(u8 *addr)
}
/**
+ * eth_addr_add() - Add (or subtract) an 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);
+}
+
+/**
* is_etherdev_addr - Tell if given Ethernet address belongs to the device.
* @dev: Pointer to a device structure
* @addr: Pointer to a six-byte array containing the Ethernet address