diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2021-10-18 14:10:02 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-10-19 12:46:24 +0100 |
| commit | e80094a473eefad9d856ce3ab0d7afdbb64800c4 (patch) | |
| tree | 248188e81bcc28400b9daf986d2b41abe1dad90b /include/linux/etherdevice.h | |
| parent | 867a92846e2eee774a9a995793e3bb964676b33e (diff) | |
ethernet: add a helper for assigning port addresses
We have 5 drivers which offset base MAC addr by port id.
Create a helper for them.
This helper takes care of overflows, which some drivers
did not do, please complain if that's going to break
anything!
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Shannon Nelson <snelson@pensando.io>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/etherdevice.h')
| -rw-r--r-- | include/linux/etherdevice.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h index 23681c3d3b8a..2ad71cc90b37 100644 --- a/include/linux/etherdevice.h +++ b/include/linux/etherdevice.h @@ -552,6 +552,27 @@ static inline unsigned long compare_ether_header(const void *a, const void *b) } /** + * eth_hw_addr_gen - Generate and assign Ethernet address to a port + * @dev: pointer to port's net_device structure + * @base_addr: base Ethernet address + * @id: offset to add to the base address + * + * Generate a MAC address using a base address and an offset and assign it + * to a net_device. Commonly used by switch drivers which need to compute + * addresses for all their ports. addr_assign_type is not changed. + */ +static inline void eth_hw_addr_gen(struct net_device *dev, const u8 *base_addr, + unsigned int id) +{ + u64 u = ether_addr_to_u64(base_addr); + u8 addr[ETH_ALEN]; + + u += id; + u64_to_ether_addr(u, addr); + eth_hw_addr_set(dev, addr); +} + +/** * eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame * @skb: Buffer to pad * |