/**
* 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_close - Disables a network interface
*
* @v netdev network interface device structure
*
**/
static void
e1000_close ( struct net_device *netdev )
{
struct e1000_adapter *adapter = netdev_priv ( netdev );
struct e1000_hw *hw = &adapter->hw;
uint32_t rctl;
uint32_t icr;
DBG ( "e1000_close\n" );
/* Acknowledge interrupts */
icr = E1000_READ_REG ( hw, ICR );
e1000_irq_disable ( adapter );
/* disable receives */
rctl = E1000_READ_REG ( hw, RCTL );
E1000_WRITE_REG ( hw, RCTL, rctl & ~E1000_RCTL_EN );
E1000_WRITE_FLUSH ( hw );
e1000_reset_hw ( hw );
e1000_free_tx_resources ( adapter );
e1000_free_rx_resources ( adapter );
}
static int
e1000_set_ringparam(struct net_device *netdev,
struct ethtool_ringparam *ring)
{
struct e1000_adapter *adapter = netdev->priv;
e1000_mac_type mac_type = adapter->hw.mac_type;
struct e1000_desc_ring *txdr = &adapter->tx_ring;
struct e1000_desc_ring *rxdr = &adapter->rx_ring;
struct e1000_desc_ring tx_old, tx_new, rx_old, rx_new;
int err;
tx_old = adapter->tx_ring;
rx_old = adapter->rx_ring;
if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
return -EINVAL;
if(netif_running(adapter->netdev))
e1000_down(adapter);
rxdr->count = max(ring->rx_pending,(uint32_t)E1000_MIN_RXD);
rxdr->count = min(rxdr->count,(uint32_t)(mac_type < e1000_82544 ?
E1000_MAX_RXD : E1000_MAX_82544_RXD));
E1000_ROUNDUP(rxdr->count, REQ_RX_DESCRIPTOR_MULTIPLE);
txdr->count = max(ring->tx_pending,(uint32_t)E1000_MIN_TXD);
txdr->count = min(txdr->count,(uint32_t)(mac_type < e1000_82544 ?
E1000_MAX_TXD : E1000_MAX_82544_TXD));
E1000_ROUNDUP(txdr->count, REQ_TX_DESCRIPTOR_MULTIPLE);
if(netif_running(adapter->netdev)) {
/* Try to get new resources before deleting old */
if((err = e1000_setup_rx_resources(adapter)))
goto err_setup_rx;
if((err = e1000_setup_tx_resources(adapter)))
goto err_setup_tx;
/* save the new, restore the old in order to free it,
* then restore the new back again */
rx_new = adapter->rx_ring;
tx_new = adapter->tx_ring;
adapter->rx_ring = rx_old;
adapter->tx_ring = tx_old;
e1000_free_rx_resources(adapter);
e1000_free_tx_resources(adapter);
adapter->rx_ring = rx_new;
adapter->tx_ring = tx_new;
if((err = e1000_up(adapter)))
return err;
}
return 0;
err_setup_tx:
e1000_free_rx_resources(adapter);
err_setup_rx:
adapter->rx_ring = rx_old;
adapter->tx_ring = tx_old;
e1000_up(adapter);
return err;
}