void _tx_ack(bool block = false)
{
/* check for acknowledgements */
while (_nic.tx()->ack_avail() || block) {
Nic::Packet_descriptor acked_packet = _nic.tx()->get_acked_packet();
_nic.tx()->release_packet(acked_packet);
block = false;
}
}
void enable_signals()
{
_nic.link_state_sigh(_link_state_dispatcher);
_nic.rx_channel()->sigh_packet_avail(_rx_packet_avail_dispatcher);
_nic.rx_channel()->sigh_ready_to_ack(_rx_ready_to_ack_dispatcher);
/* set initial link-state */
_handle_link_state(1);
}
int send_packet(void *packet, uint32_t packet_len)
{
Nic::Packet_descriptor tx_packet = _alloc_tx_packet(packet_len);
char *tx_content = _nic.tx()->packet_content(tx_packet);
Genode::memcpy(tx_content, packet, packet_len);
_nic.tx()->submit_packet(tx_packet);
_tx_ack();
return VINF_SUCCESS;
}
Nic_client(PDRVNIC drvtap)
:
_tx_block_alloc(_packet_allocator()),
_nic(_tx_block_alloc, BUF_SIZE, BUF_SIZE),
_link_state_dispatcher(_sig_rec, *this, &Nic_client::_handle_link_state),
_rx_packet_avail_dispatcher(_sig_rec, *this, &Nic_client::_handle_rx_packet_avail),
_rx_ready_to_ack_dispatcher(_sig_rec, *this, &Nic_client::_handle_rx_ready_to_ack),
_destruct_dispatcher(_sig_rec, *this, &Nic_client::_handle_destruct),
_down_rx(drvtap->pIAboveNet),
_down_rx_config(drvtap->pIAboveConfig)
{
_nic.link_state_sigh(_link_state_dispatcher);
_nic.rx_channel()->sigh_packet_avail(_rx_packet_avail_dispatcher);
_nic.rx_channel()->sigh_ready_to_ack(_rx_ready_to_ack_dispatcher);
}
void _handle_rx_packet_avail(unsigned)
{
while (_nic.rx()->packet_avail() && _nic.rx()->ready_to_ack()) {
Nic::Packet_descriptor rx_packet = _nic.rx()->get_packet();
char *rx_content = _nic.rx()->packet_content(rx_packet);
int rc = _down_rx->pfnWaitReceiveAvail(_down_rx, RT_INDEFINITE_WAIT);
if (RT_FAILURE(rc))
continue;
rc = _down_rx->pfnReceive(_down_rx, rx_content, rx_packet.size());
AssertRC(rc);
_nic.rx()->acknowledge_packet(rx_packet);
}
}
void _handle_link_state(unsigned)
{
_link_up = _nic.link_state();
_down_rx_config->pfnSetLinkState(_down_rx_config,
_link_up ? PDMNETWORKLINKSTATE_UP
: PDMNETWORKLINKSTATE_DOWN);
}
Nic::Packet_descriptor _alloc_tx_packet(Genode::size_t len)
{
while (true) {
try {
Nic::Packet_descriptor packet = _nic.tx()->alloc_packet(len);
return packet;
} catch (Nic::Session::Tx::Source::Packet_alloc_failed) {
_tx_ack(true);
}
}
}
Nic::Mac_address mac_address() { return _nic.mac_address(); }