static int vnet_txavail(struct net_driver_s *dev)
{
FAR struct vnet_driver_s *vnet = (FAR struct vnet_driver_s *)dev->d_private;
irqstate_t flags;
/* Disable interrupts because this function may be called from interrupt
* level processing.
*/
flags = enter_critical_section();
/* Ignore the notification if the interface is not yet up */
if (vnet->sk_bifup)
{
/* Check if there is room in the hardware to hold another outgoing packet. */
if (vnet_is_txbuff_full(vnet->vnet))
{
#ifdef CONFIG_DEBUG
cprintf("VNET: TX buffer is full\n");
#endif
goto out;
}
/* If so, then poll the network for new XMIT data */
(void)devif_poll(&vnet->sk_dev, vnet_txpoll);
}
out:
leave_critical_section(flags);
return OK;
}
static void vnet_polltimer(int argc, uint32_t arg, ...)
{
FAR struct vnet_driver_s *vnet = (FAR struct vnet_driver_s *)arg;
/* Check if there is room in the send another TX packet. We cannot perform
* the TX poll if he are unable to accept another packet for transmission.
*/
if (vnet_is_txbuff_full(vnet->vnet))
{
#ifdef CONFIG_DEBUG
cprintf("VNET: TX buffer is full\n");
#endif
return;
}
/* If so, update TCP timing states and poll the network for new XMIT data.
* Hmmm.. might be bug here. Does this mean if there is a transmit in
* progress, we will missing TCP time state updates?
*/
(void)devif_timer(&vnet->sk_dev, vnet_txpoll);
/* Setup the watchdog poll timer again */
(void)wd_start(vnet->sk_txpoll, VNET_WDDELAY, vnet_polltimer, 1,
(wdparm_t)arg);
}
static int vnet_uiptxpoll(struct uip_driver_s *dev)
{
FAR struct vnet_driver_s *vnet = (FAR struct vnet_driver_s *)dev->d_private;
/* If the polling resulted in data that should be sent out on the network,
* the field d_len is set to a value > 0.
*/
if (vnet->sk_dev.d_len > 0)
{
uip_arp_out(&vnet->sk_dev);
vnet_transmit(vnet);
/* Check if there is room in the device to hold another packet. If not,
* return a non-zero value to terminate the poll.
*/
if (vnet_is_txbuff_full(vnet->vnet))
return 1;
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return 0;
}
static int vnet_txpoll(struct net_driver_s *dev)
{
FAR struct vnet_driver_s *vnet = (FAR struct vnet_driver_s *)dev->d_private;
/* If the polling resulted in data that should be sent out on the network,
* the field d_len is set to a value > 0.
*/
if (vnet->sk_dev.d_len > 0)
{
/* Look up the destination MAC address and add it to the Ethernet
* header.
*/
#ifdef CONFIG_NET_IPv4
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv4(vnet->sk_dev.d_flags))
#endif
{
arp_out(&vnet->sk_dev);
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
#ifdef CONFIG_NET_IPv4
else
#endif
{
neighbor_out(&vnet->sk_dev);
}
#endif /* CONFIG_NET_IPv6 */
/* Send the packet */
vnet_transmit(vnet);
/* Check if there is room in the device to hold another packet. If not,
* return a non-zero value to terminate the poll.
*/
if (vnet_is_txbuff_full(vnet->vnet))
{
return 1;
}
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return 0;
}
