/**
* e1000_setup_rx_resources - allocate Rx resources (Descriptors)
*
* @v adapter e1000 private structure
*
* @ret rc Returns 0 on success, negative on failure
**/
static int
e1000_setup_rx_resources ( struct e1000_adapter *adapter )
{
int i, rc = 0;
DBG ( "e1000_setup_rx_resources\n" );
/* Allocate receive descriptor ring memory.
It must not cross a 64K boundary because of hardware errata
*/
adapter->rx_base =
malloc_dma ( adapter->rx_ring_size, adapter->rx_ring_size );
if ( ! adapter->rx_base ) {
return -ENOMEM;
}
memset ( adapter->rx_base, 0, adapter->rx_ring_size );
for ( i = 0; i < NUM_RX_DESC; i++ ) {
/* let e1000_refill_rx_ring() io_buffer allocations */
adapter->rx_iobuf[i] = NULL;
}
/* allocate io_buffers */
rc = e1000_refill_rx_ring ( adapter );
if ( rc < 0 )
e1000_free_rx_resources ( adapter );
return rc;
}
/**
* e1000_poll - Poll for received packets
*
* @v netdev Network device
*/
static void e1000_poll ( struct net_device *netdev )
{
struct e1000_adapter *adapter = netdev_priv( netdev );
struct e1000_hw *hw = &adapter->hw;
uint32_t icr;
DBGP ( "e1000_poll\n" );
/* Acknowledge interrupts */
icr = E1000_READ_REG ( hw, E1000_ICR );
if ( ! icr )
return;
DBG ( "e1000_poll: intr_status = %#08x\n", icr );
e1000_process_tx_packets ( netdev );
e1000_process_rx_packets ( netdev );
e1000_refill_rx_ring(adapter);
}
/**
* e1000_poll - Poll for received packets
*
* @v netdev Network device
*/
static void
e1000_poll ( struct net_device *netdev )
{
struct e1000_adapter *adapter = netdev_priv( netdev );
struct e1000_hw *hw = &adapter->hw;
uint32_t icr;
uint32_t tx_status;
uint32_t rx_status;
uint32_t rx_len;
uint32_t rx_err;
struct e1000_tx_desc *tx_curr_desc;
struct e1000_rx_desc *rx_curr_desc;
uint32_t i;
DBGP ( "e1000_poll\n" );
/* Acknowledge interrupts */
icr = E1000_READ_REG ( hw, ICR );
if ( ! icr )
return;
DBG ( "e1000_poll: intr_status = %#08x\n", icr );
/* Check status of transmitted packets
*/
while ( ( i = adapter->tx_head ) != adapter->tx_tail ) {
tx_curr_desc = ( void * ) ( adapter->tx_base ) +
( i * sizeof ( *adapter->tx_base ) );
tx_status = tx_curr_desc->upper.data;
/* if the packet at tx_head is not owned by hardware it is for us */
if ( ! ( tx_status & E1000_TXD_STAT_DD ) )
break;
DBG ( "Sent packet. tx_head: %d tx_tail: %d tx_status: %#08x\n",
adapter->tx_head, adapter->tx_tail, tx_status );
if ( tx_status & ( E1000_TXD_STAT_EC | E1000_TXD_STAT_LC |
E1000_TXD_STAT_TU ) ) {
netdev_tx_complete_err ( netdev, adapter->tx_iobuf[i], -EINVAL );
DBG ( "Error transmitting packet, tx_status: %#08x\n",
tx_status );
} else {
netdev_tx_complete ( netdev, adapter->tx_iobuf[i] );
DBG ( "Success transmitting packet, tx_status: %#08x\n",
tx_status );
}
/* Decrement count of used descriptors, clear this descriptor
*/
adapter->tx_fill_ctr--;
memset ( tx_curr_desc, 0, sizeof ( *tx_curr_desc ) );
adapter->tx_head = ( adapter->tx_head + 1 ) % NUM_TX_DESC;
}
/* Process received packets
*/
while ( 1 ) {
i = adapter->rx_curr;
rx_curr_desc = ( void * ) ( adapter->rx_base ) +
( i * sizeof ( *adapter->rx_base ) );
rx_status = rx_curr_desc->status;
DBG2 ( "Before DD Check RX_status: %#08x\n", rx_status );
if ( ! ( rx_status & E1000_RXD_STAT_DD ) )
break;
if ( adapter->rx_iobuf[i] == NULL )
break;
DBG ( "RCTL = %#08x\n", E1000_READ_REG ( &adapter->hw, RCTL ) );
rx_len = rx_curr_desc->length;
DBG ( "Received packet, rx_curr: %d rx_status: %#08x rx_len: %d\n",
i, rx_status, rx_len );
rx_err = rx_curr_desc->errors;
iob_put ( adapter->rx_iobuf[i], rx_len );
if ( rx_err & E1000_RXD_ERR_FRAME_ERR_MASK ) {
netdev_rx_err ( netdev, adapter->rx_iobuf[i], -EINVAL );
DBG ( "e1000_poll: Corrupted packet received!"
" rx_err: %#08x\n", rx_err );
} else {
/* Add this packet to the receive queue. */
netdev_rx ( netdev, adapter->rx_iobuf[i] );
}
adapter->rx_iobuf[i] = NULL;
memset ( rx_curr_desc, 0, sizeof ( *rx_curr_desc ) );
adapter->rx_curr = ( adapter->rx_curr + 1 ) % NUM_RX_DESC;
}
e1000_refill_rx_ring(adapter);
}