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drivers: ethernet: stm32 generate_mac

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Ethernet MAC addresses are not unique enough
use unique_device_ID full range (96 bits)
call crc32_ieee() to generate last 3 bytes of mac address

Signed-off-by: Marc Desvaux <marc.desvaux-ext@st.com>
This commit is contained in:
Marc Desvaux
2023-07-21 10:38:38 +02:00
committed by Carles Cufí
parent 0f23cda744
commit 76ba68cd18
1 changed files with 7 additions and 1 deletions
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8
drivers/ethernet/eth_stm32_hal.c
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@@ -1098,6 +1098,9 @@ void HAL_ETH_RxCpltCallback(ETH_HandleTypeDef *heth_handle)
static void generate_mac(uint8_t *mac_addr)
{
uint8_t unique_device_ID_12_bytes[12];
uint32_t result_mac_32_bits;
#if defined(ETH_STM32_RANDOM_MAC)
/* Either CONFIG_ETH_STM32_HAL_RANDOM_MAC or device tree property */
/* "zephyr,random-mac-address" is set, generate a random mac address */
@@ -1116,7 +1119,10 @@ static void generate_mac(uint8_t *mac_addr)
mac_addr[5] = CONFIG_ETH_STM32_HAL_MAC5;
#else
/* Nothing defined by the user, use device id */
hwinfo_get_device_id(&mac_addr[3], 3);
hwinfo_get_device_id(unique_device_ID_12_bytes, 12);
result_mac_32_bits = crc32_ieee((uint8_t *)unique_device_ID_12_bytes, 12);
memcpy(&mac_addr[3], &result_mac_32_bits, 3);
#endif /* NODE_HAS_VALID_MAC_ADDR(DT_DRV_INST(0))) */
#endif
}