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    Subject[PATCH 08/37] net: add helper eth_addr_add()
    Date
    From: Michael Walle <michael@walle.cc>

    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>
    ---
    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
    --
    2.25.1
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