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author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2023-09-11 17:59:26 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2023-09-22 11:43:16 +0200 |
commit | a2c43964384480d0455db9f8a01f44f748c2ea96 (patch) | |
tree | 908ef5e578c2d6b021e28132bdd2e52daa1cd48d /include/net.h | |
parent | 9a3b3f134997d65a4e9af5fc1f663840c005c389 (diff) | |
download | barebox-a2c43964384480d0455db9f8a01f44f748c2ea96.tar.gz barebox-a2c43964384480d0455db9f8a01f44f748c2ea96.tar.xz |
net: import Linux eth_addr_inc/dec/add helpers
Linux has a number of helpers to do arithmetic on Ethernet addresses,
which are useful for generating sequential MAC addresses. Import them.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230911155927.3786335-2-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include/net.h')
-rw-r--r-- | include/net.h | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/include/net.h b/include/net.h index 5e029c71f2..a0ef8bee04 100644 --- a/include/net.h +++ b/include/net.h @@ -449,6 +449,77 @@ static inline int is_valid_ether_addr(const u8 *addr) return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr); } +/** + * ether_addr_to_u64 - Convert an Ethernet address into a u64 value. + * @addr: Pointer to a six-byte array containing the Ethernet address + * + * Return a u64 value of the address + */ +static inline u64 ether_addr_to_u64(const u8 *addr) +{ + u64 u = 0; + int i; + + for (i = 0; i < ETH_ALEN; i++) + u = u << 8 | addr[i]; + + return u; +} + +/** + * u64_to_ether_addr - Convert a u64 to an Ethernet address. + * @u: u64 to convert to an Ethernet MAC address + * @addr: Pointer to a six-byte array to contain the Ethernet address + */ +static inline void u64_to_ether_addr(u64 u, u8 *addr) +{ + int i; + + for (i = ETH_ALEN - 1; i >= 0; i--) { + addr[i] = u & 0xff; + u = u >> 8; + } +} + +/** + * eth_addr_dec - Decrement the given MAC address + * + * @addr: Pointer to a six-byte array containing Ethernet address to decrement + */ +static inline void eth_addr_dec(u8 *addr) +{ + u64 u = ether_addr_to_u64(addr); + + u--; + u64_to_ether_addr(u, addr); +} + +/** + * eth_addr_inc() - Increment the given MAC address. + * @addr: Pointer to a six-byte array containing Ethernet address to increment. + */ +static inline void eth_addr_inc(u8 *addr) +{ + u64 u = ether_addr_to_u64(addr); + + u++; + 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); +} + typedef void rx_handler_f(void *ctx, char *packet, unsigned int len); struct eth_device *eth_get_byname(const char *name); |