diff options
| -rw-r--r-- | README | 3 | ||||
| -rw-r--r-- | doc/README.enetaddr | 2 | ||||
| -rw-r--r-- | net/Kconfig | 8 | ||||
| -rw-r--r-- | net/eth.c | 12 |
4 files changed, 24 insertions, 1 deletions
@@ -5623,7 +5623,8 @@ o If both the SROM and the environment contain a MAC address, and the warning is printed. o If neither SROM nor the environment contain a MAC address, an error - is raised. + is raised. If CONFIG_NET_RANDOM_ETHADDR is defined, then in this case + a random, locally-assigned MAC is used. If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses will be programmed into hardware as part of the initialization process. This diff --git a/doc/README.enetaddr b/doc/README.enetaddr index 0fafd2cdcd..82c9cd5fe5 100644 --- a/doc/README.enetaddr +++ b/doc/README.enetaddr @@ -37,6 +37,8 @@ Correct flow of setting up the MAC address (summarized): environment variable will be used unchanged. If the environment variable is not set, it will be initialized from eth_device->enetaddr, and a warning will be printed. + If both are invalid and CONFIG_NET_RANDOM_ETHADDR is defined, a random, + locally-assigned MAC is written to eth_device->enetaddr. 4. Program the address into hardware if the following conditions are met: a) The relevant driver has a 'write_addr' function b) The user hasn't set an 'ethmacskip' environment variable diff --git a/net/Kconfig b/net/Kconfig index 22b9eaac53..a2bd4fe580 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -7,4 +7,12 @@ menuconfig NET if NET +config NET_RANDOM_ETHADDR + bool "Random ethaddr if unset" + help + Selecting this will allow the Ethernet interface to function + even when the ethaddr variable for that interface is unset. + A new MAC address will be generated on every boot and it will + not be added to the environment. + endif # if NET @@ -538,9 +538,15 @@ static int eth_post_probe(struct udevice *dev) printf("\nWarning: %s using MAC address from ROM\n", dev->name); } else if (is_zero_ethaddr(pdata->enetaddr)) { +#ifdef CONFIG_NET_RANDOM_ETHADDR + net_random_ethaddr(pdata->enetaddr); + printf("\nWarning: %s (eth%d) using random MAC address - %pM\n", + dev->name, dev->seq, pdata->enetaddr); +#else printf("\nError: %s address not set.\n", dev->name); return -EINVAL; +#endif } return 0; @@ -666,9 +672,15 @@ int eth_write_hwaddr(struct eth_device *dev, const char *base_name, printf("\nWarning: %s using MAC address from net device\n", dev->name); } else if (is_zero_ethaddr(dev->enetaddr)) { +#ifdef CONFIG_NET_RANDOM_ETHADDR + net_random_ethaddr(dev->enetaddr); + printf("\nWarning: %s (eth%d) using random MAC address - %pM\n", + dev->name, eth_number, dev->enetaddr); +#else printf("\nError: %s address not set.\n", dev->name); return -EINVAL; +#endif } if (dev->write_hwaddr && !eth_mac_skip(eth_number)) { |