static ssize_t rtl8139_read(dev_cookie cookie, void *buf, off_t pos, ssize_t len)
{
rtl8139 *rtl = (rtl8139 *)cookie;
if(len < ETHERNET_MAX_SIZE)
return ERR_VFS_INSUFFICIENT_BUF;
return rtl8139_rx(rtl, buf, len);
}
static void rtl8139_dpc(void *arg) {
struct dev *dev = (struct dev *) arg;
struct nic *np = (struct nic *) dev->privdata;
struct nic *tp = np;
int boguscnt = np->max_interrupt_work;
long ioaddr = tp->iobase;
int link_changed = 0;
while (1) {
int status = inpw(ioaddr + IntrStatus);
// Acknowledge all of the current interrupt sources ASAP, but
// first get an additional status bit from CSCR
if (status & RxUnderrun) link_changed = inpw(ioaddr + CSCR) & CSCR_LinkChangeBit;
outpw(ioaddr + IntrStatus, status);
//kprintf("%s: dpc status=%#4.4x new intstat=%#4.4x\n", dev->name, status, inpw(ioaddr + IntrStatus));
if ((status & (PCIErr | PCSTimeout | RxUnderrun | RxOverflow | RxFIFOOver | TxErr | TxOK | RxErr | RxOK)) == 0) break;
if (status & (RxOK | RxUnderrun | RxOverflow | RxFIFOOver)) {
// Rx interrupt
rtl8139_rx(dev);
}
if (status & (TxOK | TxErr)) {
unsigned int dirty_tx = tp->dirty_tx;
int entries_freed = 0;
while (tp->cur_tx - dirty_tx > 0) {
int entry = dirty_tx % NUM_TX_DESC;
int txstatus = inpd(ioaddr + TxStatus0 + entry * 4);
if (!(txstatus & (TxStatOK | TxUnderrun | TxAborted))) break; // It still hasn't been Txed
// Note: TxCarrierLost is always asserted at 100mbps
if (txstatus & (TxOutOfWindow | TxAborted)) {
// There was an major error, log it
kprintf("%s: Transmit error, Tx status %8.8x\n", dev->name, txstatus);
tp->stats.tx_errors++;
if (txstatus & TxAborted) {
tp->stats.tx_aborted_errors++;
outpd(ioaddr + TxConfig, TX_DMA_BURST << 8);
}
if (txstatus & TxCarrierLost) tp->stats.tx_carrier_errors++;
if (txstatus & TxOutOfWindow) tp->stats.tx_window_errors++;
} else {
//kprintf("%s: Transmit done, Tx status %8.8x\n", dev->name, txstatus);
if (txstatus & TxUnderrun) {
// Add 64 to the Tx FIFO threshold
if (tp->tx_flag < 0x00300000) tp->tx_flag += 0x00020000;
tp->stats.tx_fifo_errors++;
}
tp->stats.collisions += (txstatus >> 24) & 15;
tp->stats.tx_bytes += txstatus & 0x7ff;
tp->stats.tx_packets++;
}
// Free the original pbuf
pbuf_free(tp->tx_pbuf[entry]);
tp->tx_pbuf[entry] = NULL;
entries_freed++;
dirty_tx++;
}
tp->dirty_tx = dirty_tx;
release_sem(&tp->tx_sem, entries_freed);
}
// Check uncommon events with one test
if (status & (PCIErr | PCSTimeout | RxUnderrun | RxOverflow | RxFIFOOver | TxErr | RxErr)) {
if (status == 0xffff) break; // Missing chip!
rtl_error(dev, status, link_changed);
}
if (--boguscnt < 0) {
kprintf("%s: Too much work at interrupt, IntrStatus=0x%4.4x\n", dev->name, status);
// Clear all interrupt sources
outpw(ioaddr + IntrStatus, 0xffff);
break;
}
}
