static void tap_send(void *opaque)
{
TAPState *s = opaque;
int size;
while (qemu_can_send_packet(&s->nc)) {
uint8_t *buf = s->buf;
size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
if (size <= 0) {
break;
}
if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
buf += s->host_vnet_hdr_len;
size -= s->host_vnet_hdr_len;
}
size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
if (size == 0) {
tap_read_poll(s, false);
break;
} else if (size < 0) {
break;
}
}
}
/* outside world -> VM */
static void
vnic_send(void *opaque)
{
VNICState *vsp = opaque;
int ret;
do {
ret = vnic_read_packet(vsp, vsp->vns_buf,
sizeof (vsp->vns_buf));
if (ret <= 0)
break;
ret = qemu_send_packet_async(&vsp->vns_nc, vsp->vns_buf, ret,
vnic_send_completed);
if (ret == 0)
vnic_read_poll(vsp, 0);
} while (ret > 0 && qemu_can_send_packet(&vsp->vns_nc));
}
static void tap_send(void *opaque)
{
TAPState *s = opaque;
int size;
int packets = 0;
while (true) {
uint8_t *buf = s->buf;
size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
if (size <= 0) {
break;
}
if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
buf += s->host_vnet_hdr_len;
size -= s->host_vnet_hdr_len;
}
size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
if (size == 0) {
tap_read_poll(s, false);
break;
} else if (size < 0) {
break;
}
/*
* When the host keeps receiving more packets while tap_send() is
* running we can hog the QEMU global mutex. Limit the number of
* packets that are processed per tap_send() callback to prevent
* stalling the guest.
*/
packets++;
if (packets >= 50) {
break;
}
}
}
/* VM -> outside world */
static ssize_t
vnic_receive(VLANClientState *ncp, const uint8_t *buf, size_t size)
{
VNICState *vsp = DO_UPCAST(VNICState, vns_nc, ncp);
if (vsp->vns_ds.vnds_enabled && is_dhcp_request(buf, size)) {
int ret;
ret = create_dhcp_response(buf, size, &vsp->vns_ds);
if (!ret)
return size;
ret = qemu_send_packet_async(&vsp->vns_nc,
vsp->vns_ds.vnds_buf, ret, vnic_send_completed);
if (ret == 0)
vnic_read_poll(vsp, 0);
return size;
}
return (vnic_write_packet(vsp, buf, size));
}
static void tap_send(void *opaque)
{
TAPState *s = opaque;
int size;
do {
uint8_t *buf = s->buf;
size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
if (size <= 0) {
break;
}
if (s->has_vnet_hdr && !s->using_vnet_hdr) {
buf += sizeof(struct virtio_net_hdr);
size -= sizeof(struct virtio_net_hdr);
}
size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
if (size == 0) {
tap_read_poll(s, 0);
}
} while (size > 0 && qemu_can_send_packet(&s->nc));
}
static ssize_t
vnic_receive_iov(VLANClientState *ncp, const struct iovec *iov,
int iovcnt)
{
int ret, fvec, i;
size_t total;
VNICState *vsp = DO_UPCAST(VNICState, vns_nc, ncp);
assert(iovcnt <= FRAMEIO_NVECS_MAX);
/*
* Copy the iovcs to our write frameio. Also, check if any of these is
* valid dhcp and handle it immediately.
*/
for (i = 0, fvec = 0; i < iovcnt; i++, iov++) {
if (vsp->vns_ds.vnds_enabled &&
is_dhcp_request(iov->iov_base, iov->iov_len)) {
/*
* Basically drop the packet because we can't send a
* reply at this time. It's unfortunate, but we don't
* really have the proper infrastructure to do something
* else with this at this time.
*/
if (!vnic_can_send(vsp))
continue;
ret = create_dhcp_response(iov->iov_base,
iov->iov_len, &vsp->vns_ds);
/* This failed, drop it and continue */
if (ret == 0)
continue;
ret = qemu_send_packet_async(&vsp->vns_nc,
vsp->vns_ds.vnds_buf, ret, vnic_send_completed);
/*
* qemu has told us that it can't receive any more data
* at this time for the guest (host->guest traffic) so
* turn off our read poll until we get that the send has
* completed.
*/
if (ret == 0)
vnic_read_poll(vsp, 0);
continue;
}
vsp->vns_wfio->fio_vecs[fvec].fv_buf = iov->iov_base;
vsp->vns_wfio->fio_vecs[fvec].fv_buflen = iov->iov_len;
fvec++;
}
vsp->vns_wfio->fio_nvecs = fvec;
do {
ret = vnd_frameio_write(vsp->vns_hdl, vsp->vns_wfio);
} while (ret == -1 && errno == EINTR);
if (ret == -1 && errno == EAGAIN) {
vnic_write_poll(vsp, 1);
return (0);
}
total = 0;
for (i = 0; i < vsp->vns_wfio->fio_nvecs; i++) {
if (vsp->vns_wfio->fio_vecs[i].fv_actlen == 0 &&
vsp->vns_wfio->fio_vecs[i].fv_buflen == 0)
break;
total += vsp->vns_wfio->fio_vecs[i].fv_actlen;
}
return (total);
}
static ssize_t
vnic_receive_iov(VLANClientState *ncp, const struct iovec *iov,
int iovcnt)
{
int ret, i;
size_t total, altsize;
VNICState *vsp = DO_UPCAST(VNICState, vns_nc, ncp);
for (total = 0, i = 0; i < iovcnt; i++) {
total += (iov + i)->iov_len;
}
if (vsp->vns_ds.vnds_enabled &&
is_dhcp_requestv(iov, iovcnt)) {
/*
* Basically drop the packet because we can't send a
* reply at this time. It's unfortunate, but we don't
* really have the proper infrastructure to do something
* else with this at this time.
*/
if (!vnic_can_send(vsp))
return (total);
ret = create_dhcp_responsev(iov, iovcnt, &vsp->vns_ds);
/* This failed, drop it and continue */
if (ret == 0)
return (total);
ret = qemu_send_packet_async(&vsp->vns_nc,
vsp->vns_ds.vnds_buf, ret, vnic_send_completed);
/*
* qemu has told us that it can't receive any more data
* at this time for the guest (host->guest traffic) so
* turn off our read poll until we get that the send has
* completed.
*/
if (ret == 0)
vnic_read_poll(vsp, 0);
return (total);
}
/*
* Copy the iovcs to our write frameio. Be on the lookout for someone
* giving us more vectors than we support in frameio. In that case,
* let's go ahead and just simply concat the rest.
*/
for (i = 0; i < MIN(iovcnt, FRAMEIO_NVECS_MAX - 1); i++, iov++) {
vsp->vns_wfio->fio_vecs[i].fv_buf = iov->iov_base;
vsp->vns_wfio->fio_vecs[i].fv_buflen = iov->iov_len;
}
altsize = 0;
for (i = MIN(iovcnt, FRAMEIO_NVECS_MAX - 1); i != iovcnt; i++, iov++) {
/*
* The packet is too large. We're goin to silently drop it...
*/
if (altsize + iov->iov_len > VNIC_BUFSIZE)
return (total);
bcopy(iov->iov_base, vsp->vns_txbuf + altsize, iov->iov_len);
altsize += iov->iov_len;
}
if (altsize != 0) {
vsp->vns_wfio->fio_vecs[FRAMEIO_NVECS_MAX-1].fv_buf =
vsp->vns_txbuf;
vsp->vns_wfio->fio_vecs[FRAMEIO_NVECS_MAX-1].fv_buflen =
altsize;
}
vsp->vns_wfio->fio_nvecs = MIN(iovcnt, FRAMEIO_NVECS_MAX);
vsp->vns_wfio->fio_nvpf = MIN(iovcnt, FRAMEIO_NVECS_MAX);
do {
ret = vnd_frameio_write(vsp->vns_hdl, vsp->vns_wfio);
} while (ret == -1 && errno == EINTR);
if (ret == -1 && errno == EAGAIN) {
vnic_write_poll(vsp, 1);
return (0);
} else if (ret == -1) {
abort();
}
total = 0;
for (i = 0; i < vsp->vns_wfio->fio_nvecs; i++) {
if (vsp->vns_wfio->fio_vecs[i].fv_actlen == 0 &&
vsp->vns_wfio->fio_vecs[i].fv_buflen == 0)
break;
total += vsp->vns_wfio->fio_vecs[i].fv_actlen;
}
return (total);
}
