static void virtio_net_tx_lazy(struct vmm_netport *port, void *arg, int budget)
{
u16 head = 0;
u32 iov_cnt = 0, pkt_len = 0, total_len = 0;
struct virtio_net_dev *ndev = arg;
struct virtio_device *dev = ndev->vdev;
struct virtio_queue *vq = &ndev->vqs[VIRTIO_NET_TX_QUEUE];
struct virtio_iovec *iov = ndev->tx_iov;
struct vmm_mbuf *mb;
while ((budget > 0) && virtio_queue_available(vq)) {
head = virtio_queue_get_iovec(vq, iov, &iov_cnt, &total_len);
/* iov[0] is offload info */
pkt_len = total_len - iov[0].len;
if (pkt_len <= VIRTIO_NET_MTU) {
MGETHDR(mb, 0, 0);
MEXTMALLOC(mb, pkt_len, M_WAIT);
virtio_iovec_to_buf_read(dev,
&iov[1], iov_cnt - 1,
M_BUFADDR(mb), pkt_len);
mb->m_len = mb->m_pktlen = pkt_len;
vmm_port2switch_xfer_mbuf(ndev->port, mb);
}
virtio_queue_set_used_elem(vq, head, total_len);
budget--;
}
if (virtio_queue_should_signal(vq)) {
dev->tra->notify(dev, VIRTIO_NET_TX_QUEUE);
}
}
static err_t lwip_netstack_output(struct netif *netif, struct pbuf *p)
{
struct vmm_mbuf *mbuf, *mbuf_head, *mbuf_cur;
struct pbuf *q;
struct lwip_netstack *lns = netif->state;
if (!p || !p->payload || !p->len) {
return ERR_OK;
}
if (p->tot_len > MAX_FRAME_LEN) {
/* Frame too long, drop it */
return ERR_MEM;
}
/* Increase reference to the pbuf as we reuse the same buffers */
pbuf_ref(p);
/* Create the first mbuf in the chain */
MGETHDR(mbuf_head, 0, 0);
MEXTADD(mbuf_head, p->payload, p->len, lwip_netstack_mbuf_free, p);
mbuf_cur = mbuf_head;
/* Create next mbufs in chain from the pbuf chain */
q = p->next;
while (q != NULL) {
MGET(mbuf, 0, M_EXT_DONTFREE);
MEXTADD(mbuf, q->payload, q->len, NULL, NULL);
mbuf_cur->m_next = mbuf;
mbuf_cur = mbuf;
q = q->next;
}
/* Setup mbuf len */
mbuf_head->m_len = mbuf_head->m_pktlen = p->tot_len;
/* Send mbuf to the netswitch */
vmm_port2switch_xfer_mbuf(lns->port, mbuf_head);
/* Return success */
return ERR_OK;
}
