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net: Add a possibility for boards to give network devices a MAC address 

MAC addresses are sometimes stored at unusual places. This
patch makes it possible to give a MAC address to a ethernet
device id. This is independent of the device actually being
present.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2011-07-28 11:36:49 +02:00
parent fee474a22e
commit c46b04542f
2 changed files with 64 additions and 1 deletions
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6
include/net.h
View File

@ -55,6 +55,12 @@ int eth_send(void *packet, int length); /* Send a packet */
int eth_rx(void); /* Check for received packets */
void eth_halt(void); /* stop SCC */
/* associate a MAC address to a ethernet device. Should be called by
* board code for boards which store their MAC address at some unusual
* place.
*/
void eth_register_ethaddr(int ethid, const char *ethaddr);
/*
* Ethernet header
*/

59
net/eth.c
View File

@ -34,6 +34,52 @@ static struct eth_device *eth_current;
static LIST_HEAD(netdev_list);
struct eth_ethaddr {
struct list_head list;
u8 ethaddr[6];
int ethid;
};
static LIST_HEAD(ethaddr_list);
static int eth_get_registered_ethaddr(int ethid, void *buf)
{
struct eth_ethaddr *addr;
list_for_each_entry(addr, &ethaddr_list, list) {
if (addr->ethid == ethid) {
memcpy(buf, addr->ethaddr, 6);
return 0;
}
}
return -EINVAL;
}
static void eth_drop_ethaddr(int ethid)
{
struct eth_ethaddr *addr, *tmp;
list_for_each_entry_safe(addr, tmp, &ethaddr_list, list) {
if (addr->ethid == ethid) {
list_del(&addr->list);
free(addr);
return;
}
}
}
void eth_register_ethaddr(int ethid, const char *ethaddr)
{
struct eth_ethaddr *addr;
eth_drop_ethaddr(ethid);
addr = xzalloc(sizeof(*addr));
addr->ethid = ethid;
memcpy(addr->ethaddr, ethaddr, 6);
list_add_tail(&addr->list, &ethaddr_list);
}
void eth_set_current(struct eth_device *eth)
{
if (eth_current && eth_current->active) {
@ -144,6 +190,7 @@ int eth_register(struct eth_device *edev)
struct device_d *dev = &edev->dev;
unsigned char ethaddr_str[20];
unsigned char ethaddr[6];
int ret, found = 0;
if (!edev->get_ethaddr) {
dev_err(dev, "no get_mac_address found for current eth device\n");
@ -165,7 +212,17 @@ int eth_register(struct eth_device *edev)
list_add_tail(&edev->list, &netdev_list);
if (edev->get_ethaddr(edev, ethaddr) == 0) {
ret = eth_get_registered_ethaddr(dev->id, ethaddr);
if (!ret)
found = 1;
if (!found) {
ret = edev->get_ethaddr(edev, ethaddr);
if (!ret)
found = 1;
}
if (found) {
ethaddr_to_string(ethaddr, ethaddr_str);
if (is_valid_ether_addr(ethaddr)) {
dev_info(dev, "got MAC address from EEPROM: %s\n", ethaddr_str);