static status_t
ethernet_link_checker(void *)
{
while (true) {
status_t status = acquire_sem_etc(sLinkChangeSemaphore, 1,
B_RELATIVE_TIMEOUT, kLinkCheckInterval);
if (status == B_BAD_SEM_ID)
break;
MutexLocker _(sListLock);
if (sCheckList.IsEmpty())
break;
// check link state of all existing devices
DoublyLinkedList<ethernet_device>::Iterator iterator
= sCheckList.GetIterator();
while (iterator.HasNext()) {
update_link_state(iterator.Next());
}
}
return B_OK;
}
status_t
ethernet_up(net_device *_device)
{
ethernet_device *device = (ethernet_device *)_device;
device->fd = open(device->name, O_RDWR);
if (device->fd < 0)
return errno;
uint64 dummy;
if (ioctl(device->fd, ETHER_INIT, &dummy, sizeof(dummy)) < 0)
goto err;
if (ioctl(device->fd, ETHER_GETADDR, device->address.data, ETHER_ADDRESS_LENGTH) < 0)
goto err;
if (ioctl(device->fd, ETHER_GETFRAMESIZE, &device->frame_size, sizeof(uint32)) < 0) {
// this call is obviously optional
device->frame_size = ETHER_MAX_FRAME_SIZE;
}
if (update_link_state(device, false) == B_OK) {
// device supports retrieval of the link state
// Set the change notification semaphore; doesn't matter
// if this is supported by the device or not
ioctl(device->fd, ETHER_SET_LINK_STATE_SEM, &sLinkChangeSemaphore,
sizeof(sem_id));
MutexLocker _(&sListLock);
if (sCheckList.IsEmpty()) {
// start thread
sLinkCheckerThread = spawn_kernel_thread(ethernet_link_checker,
"ethernet link state checker", B_LOW_PRIORITY, NULL);
if (sLinkCheckerThread >= B_OK)
resume_thread(sLinkCheckerThread);
}
sCheckList.Add(device);
}
device->address.length = ETHER_ADDRESS_LENGTH;
device->mtu = device->frame_size - device->header_length;
return B_OK;
err:
close(device->fd);
device->fd = -1;
return errno;
}