static int virtio_net_switch2port_xfer(struct vmm_netport *p,
struct vmm_mbuf *mb)
{
u16 head = 0;
u32 iov_cnt = 0, total_len = 0, pkt_len = 0;
struct virtio_net_dev *ndev = p->priv;
struct virtio_queue *vq = &ndev->vqs[VIRTIO_NET_RX_QUEUE];
struct virtio_iovec *iov = ndev->rx_iov;
struct virtio_device *dev = ndev->vdev;
pkt_len = min(VIRTIO_NET_MTU, mb->m_pktlen);
if (virtio_queue_available(vq)) {
head = virtio_queue_get_iovec(vq, iov, &iov_cnt, &total_len);
}
if (iov_cnt > 1) {
virtio_iovec_fill_zeros(dev, &iov[0], 1);
virtio_buf_to_iovec_write(dev, &iov[1], 1,
M_BUFADDR(mb), pkt_len);
virtio_queue_set_used_elem(vq, head, iov[0].len + pkt_len);
if (virtio_queue_should_signal(vq)) {
dev->tra->notify(dev, VIRTIO_NET_RX_QUEUE);
}
}
m_freem(mb);
return VMM_OK;
}
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);
}
}
/*
* Like _bus_dmamap_load(), but for mbufs.
*/
int
bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map,
struct mbuf *m0, int flags)
{
paddr_t lastaddr = 0;
int seg, error, first;
struct mbuf *m;
/*
* Make sure that on error condition we return "no valid mappings."
*/
map->dm_mapsize = 0;
map->dm_nsegs = 0;
KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz);
#ifdef DIAGNOSTIC
if ((m0->m_flags & M_PKTHDR) == 0)
panic("_bus_dmamap_load_mbuf: no packet header");
#endif
if (m0->m_pkthdr.len > map->_dm_size)
return (EINVAL);
first = 1;
seg = 0;
error = 0;
for (m = m0; m != NULL && error == 0; m = m->m_next, first = 0) {
if (m->m_len == 0)
continue;
#ifdef POOL_VTOPHYS
/* XXX Could be better about coalescing. */
/* XXX Doesn't check boundaries. */
switch (m->m_flags & (M_EXT|M_CLUSTER)) {
case M_EXT|M_CLUSTER:
/* XXX KDASSERT */
KASSERT(m->m_ext.ext_paddr != M_PADDR_INVALID);
lastaddr = m->m_ext.ext_paddr +
(m->m_data - m->m_ext.ext_buf);
have_addr:
if (first == 0 && ++seg >= map->_dm_segcnt) {
error = EFBIG;
continue;
}
map->dm_segs[seg].ds_addr =
rumpcomp_pci_virt_to_mach((void *)lastaddr);
map->dm_segs[seg].ds_len = m->m_len;
lastaddr += m->m_len;
continue;
case 0:
lastaddr = m->m_paddr + M_BUFOFFSET(m) +
(m->m_data - M_BUFADDR(m));
goto have_addr;
default:
break;
}
#endif
error = _bus_dmamap_load_buffer(t, map, m->m_data,
m->m_len, vmspace_kernel(), flags, &lastaddr, &seg, first);
}
if (error == 0) {
map->dm_mapsize = m0->m_pkthdr.len;
map->dm_nsegs = seg + 1;
}
return (error);
}