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net: add helper eth_addr_add()

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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>
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>
This commit is contained in:
Michael Walle 2023-02-06 13:43:42 +00:00 committed by Greg Kroah-Hartman
parent 2e8dc541ae
commit 7390609b01
1 changed files with 14 additions and 0 deletions
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14
include/linux/etherdevice.h
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@ -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