// license:BSD-3-Clause
// copyright-holders:Carl, Miodrag Milanovic
#include "emu.h"
#include "osdnet.h"
device_network_interface::device_network_interface(const machine_config &mconfig, device_t &device, float bandwidth)
: device_interface(device, "network")
{
m_promisc = false;
m_bandwidth = bandwidth;
set_mac("\0\0\0\0\0\0");
m_intf = 0;
m_loopback_control = false;
}
device_network_interface::~device_network_interface()
{
}
void device_network_interface::interface_pre_start()
{
m_send_timer = device().machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(device_network_interface::send_complete), this));
m_recv_timer = device().machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(device_network_interface::recv_complete), this));
}
void device_network_interface::interface_post_start()
{
device().save_item(NAME(m_loopback_control));
}
int device_network_interface::send(u8 *buf, int len)
{
// TODO: enable this check when other devices implement delayed transmit
//if (m_send_timer->enabled())
//throw emu_fatalerror("%s(%s): attempted to transmit while transmit already in progress", device().shortname(), device().tag());
int result = 0;
if (m_loopback_control)
{
// loop data back to receiver
result = recv_start_cb(buf, len);
if (result)
{
// schedule receive complete callback
m_recv_timer->adjust(attotime::from_ticks(len, m_bandwidth * 1'000'000 / 8), result);
}
}
else if (m_dev)
{
// send the data
result = m_dev->send(buf, len);
}
// schedule transmit complete callback
m_send_timer->adjust(attotime::from_ticks(len, m_bandwidth * 1'000'000 / 8), result);
return result;
}
TIMER_CALLBACK_MEMBER(device_network_interface::send_complete)
{
send_complete_cb(param);
}
void device_network_interface::recv_cb(u8 *buf, int len)
{
if (m_recv_timer->enabled())
throw emu_fatalerror("%s(%s): attempted to receive while receive already in progress", device().shortname(), device().tag());
int result = 0;
// process the received data
if (!m_loopback_control)
result = recv_start_cb(buf, len);
if (result)
{
// stop receiving more data from the network
if (m_dev)
m_dev->stop();
// schedule receive complete callback
m_recv_timer->adjust(attotime::from_ticks(len, m_bandwidth * 1'000'000 / 8), result);
}
}
TIMER_CALLBACK_MEMBER(device_network_interface::recv_complete)
{
recv_complete_cb(param);
// start receiving data from the network again
if (m_dev && !m_loopback_control)
m_dev->start();
}
void device_network_interface::set_promisc(bool promisc)
{
m_promisc = promisc;
if(m_dev) m_dev->set_promisc(promisc);
}
void device_network_interface::set_mac(const char *mac)
{
memcpy(m_mac, mac, 6);
if(m_dev) m_dev->set_mac(m_mac);
}
void device_network_interface::set_interface(int id)
{
if(m_dev)
m_dev->stop();
m_dev.reset(open_netdev(id, this, (int)(m_bandwidth*1000000/8.0f/1500)));
if(!m_dev) {
device().logerror("Network interface %d not found\n", id);
id = -1;
}
m_intf = id;
}
void device_network_interface::set_loopback(bool loopback)
{
if (m_loopback_control == loopback)
return;
m_loopback_control = loopback;
if (m_dev)
{
if (loopback)
m_dev->stop();
else if (!m_recv_timer->enabled())
m_dev->start();
}
}