Messages in this thread Patch in this message | | | From | Michael Walle <> | Subject | [PATCH v4 01/20] net: add helper eth_addr_add() | Date | Wed, 23 Nov 2022 19:01:32 +0100 |
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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> --- changes since v3: - fix typo s/and/an/
changes since v2: - none
changes since v1: - none
include/linux/etherdevice.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
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 @@ -507,6 +507,20 @@ static inline void eth_addr_inc(u8 *addr) u64_to_ether_addr(u, 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 -- 2.30.2
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