static int emul_notify(ethif_virtio_emul_t *emul) {
if (emul->internal->status != VIRTIO_CONFIG_S_DRIVER_OK) {
return -1;
}
emul_notify_tx(emul);
return 0;
}
static int emul_io_out(struct ethif_virtio_emul *emul, unsigned int offset, unsigned int size, unsigned int value)
{
switch (offset) {
case VIRTIO_PCI_GUEST_FEATURES:
assert(size == 4);
assert(value == BIT(VIRTIO_NET_F_MAC));
break;
case VIRTIO_PCI_STATUS:
assert(size == 1);
emul->internal->status = value & 0xff;
break;
case VIRTIO_PCI_QUEUE_SEL:
assert(size == 2);
emul->internal->queue = (value & 0xffff);
assert(emul->internal->queue == 0 || emul->internal->queue == 1);
break;
case VIRTIO_PCI_QUEUE_PFN: {
assert(size == 4);
int queue = emul->internal->queue;
emul->internal->queue_pfn[queue] = value;
vring_init(&emul->internal->vring[queue], emul->internal->queue_size[queue], (void*)(uintptr_t)(value << 12), VIRTIO_PCI_VRING_ALIGN);
break;
}
case VIRTIO_PCI_QUEUE_NOTIFY:
if (value == RX_QUEUE) {
/* Currently RX packets will just get dropped if there was no space
* so we will never have work to do if the client suddenly adds
* more buffers */
} else if (value == TX_QUEUE) {
emul_notify_tx(emul);
}
break;
default:
printf("Unhandled offset of 0x%x of size %d, writing 0x%x\n", offset, size, value);
assert(!"panic");
}
return 0;
}
static void emul_tx_complete_external(void *iface, void *cookie) {
emul_tx_complete(iface, cookie);
/* space may have cleared for additional transmits */
emul_notify_tx(iface);
}
