e1000_main.c

linux-2.4.29操作系统的源码

{
	struct e1000_desc_ring *rxdr = &adapter->rx_ring;
	struct pci_dev *pdev = adapter->pdev;
	int size;

	size = sizeof(struct e1000_buffer) * rxdr->count;
	rxdr->buffer_info = vmalloc(size);
	if(!rxdr->buffer_info) {
		DPRINTK(PROBE, ERR, 
		"Unable to Allocate Memory for the Recieve descriptor ring\n");
		return -ENOMEM;
	}
	memset(rxdr->buffer_info, 0, size);

	/* Round up to nearest 4K */

	rxdr->size = rxdr->count * sizeof(struct e1000_rx_desc);
	E1000_ROUNDUP(rxdr->size, 4096);

	rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);

	if(!rxdr->desc) {
		DPRINTK(PROBE, ERR, 
		"Unable to Allocate Memory for the Recieve descriptor ring\n");
		vfree(rxdr->buffer_info);
		return -ENOMEM;
	}
	memset(rxdr->desc, 0, rxdr->size);

	rxdr->next_to_clean = 0;
	rxdr->next_to_use = 0;

	return 0;
}

/**
 * e1000_setup_rctl - configure the receive control register
 * @adapter: Board private structure
 **/

static void
e1000_setup_rctl(struct e1000_adapter *adapter)
{
	uint32_t rctl;

	rctl = E1000_READ_REG(&adapter->hw, RCTL);

	rctl &= ~(3 << E1000_RCTL_MO_SHIFT);

	rctl |= E1000_RCTL_EN | E1000_RCTL_BAM |
		E1000_RCTL_LBM_NO | E1000_RCTL_RDMTS_HALF |
		(adapter->hw.mc_filter_type << E1000_RCTL_MO_SHIFT);

	if(adapter->hw.tbi_compatibility_on == 1)
		rctl |= E1000_RCTL_SBP;
	else
		rctl &= ~E1000_RCTL_SBP;

	/* Setup buffer sizes */
	rctl &= ~(E1000_RCTL_SZ_4096);
	rctl |= (E1000_RCTL_BSEX | E1000_RCTL_LPE);
	switch (adapter->rx_buffer_len) {
	case E1000_RXBUFFER_2048:
	default:
		rctl |= E1000_RCTL_SZ_2048;
		rctl &= ~(E1000_RCTL_BSEX | E1000_RCTL_LPE);
		break;
	case E1000_RXBUFFER_4096:
		rctl |= E1000_RCTL_SZ_4096;
		break;
	case E1000_RXBUFFER_8192:
		rctl |= E1000_RCTL_SZ_8192;
		break;
	case E1000_RXBUFFER_16384:
		rctl |= E1000_RCTL_SZ_16384;
		break;
	}

	E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
}

/**
 * e1000_configure_rx - Configure 8254x Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/

static void
e1000_configure_rx(struct e1000_adapter *adapter)
{
	uint64_t rdba = adapter->rx_ring.dma;
	uint32_t rdlen = adapter->rx_ring.count * sizeof(struct e1000_rx_desc);
	uint32_t rctl;
	uint32_t rxcsum;

	/* disable receives while setting up the descriptors */
	rctl = E1000_READ_REG(&adapter->hw, RCTL);
	E1000_WRITE_REG(&adapter->hw, RCTL, rctl & ~E1000_RCTL_EN);

	/* set the Receive Delay Timer Register */
	E1000_WRITE_REG(&adapter->hw, RDTR, adapter->rx_int_delay);

	if(adapter->hw.mac_type >= e1000_82540) {
		E1000_WRITE_REG(&adapter->hw, RADV, adapter->rx_abs_int_delay);
		if(adapter->itr > 1)
			E1000_WRITE_REG(&adapter->hw, ITR,
				1000000000 / (adapter->itr * 256));
	}

	/* Setup the Base and Length of the Rx Descriptor Ring */
	E1000_WRITE_REG(&adapter->hw, RDBAL, (rdba & 0x00000000ffffffffULL));
	E1000_WRITE_REG(&adapter->hw, RDBAH, (rdba >> 32));

	E1000_WRITE_REG(&adapter->hw, RDLEN, rdlen);

	/* Setup the HW Rx Head and Tail Descriptor Pointers */
	E1000_WRITE_REG(&adapter->hw, RDH, 0);
	E1000_WRITE_REG(&adapter->hw, RDT, 0);

	/* Enable 82543 Receive Checksum Offload for TCP and UDP */
	if((adapter->hw.mac_type >= e1000_82543) &&
	   (adapter->rx_csum == TRUE)) {
		rxcsum = E1000_READ_REG(&adapter->hw, RXCSUM);
		rxcsum |= E1000_RXCSUM_TUOFL;
		E1000_WRITE_REG(&adapter->hw, RXCSUM, rxcsum);
	}

	/* Enable Receives */
	E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
}

/**
 * e1000_free_tx_resources - Free Tx Resources
 * @adapter: board private structure
 *
 * Free all transmit software resources
 **/

void
e1000_free_tx_resources(struct e1000_adapter *adapter)
{
	struct pci_dev *pdev = adapter->pdev;

	e1000_clean_tx_ring(adapter);

	vfree(adapter->tx_ring.buffer_info);
	adapter->tx_ring.buffer_info = NULL;

	pci_free_consistent(pdev, adapter->tx_ring.size,
	                    adapter->tx_ring.desc, adapter->tx_ring.dma);

	adapter->tx_ring.desc = NULL;
}

static inline void
e1000_unmap_and_free_tx_resource(struct e1000_adapter *adapter,
			struct e1000_buffer *buffer_info)
{
	struct pci_dev *pdev = adapter->pdev;
	if(buffer_info->dma) {
		pci_unmap_page(pdev,
			       buffer_info->dma,
			       buffer_info->length,
			       PCI_DMA_TODEVICE);
		buffer_info->dma = 0;
	}
	if(buffer_info->skb) {
		dev_kfree_skb_any(buffer_info->skb);
		buffer_info->skb = NULL;
	}
}

/**
 * e1000_clean_tx_ring - Free Tx Buffers
 * @adapter: board private structure
 **/

static void
e1000_clean_tx_ring(struct e1000_adapter *adapter)
{
	struct e1000_desc_ring *tx_ring = &adapter->tx_ring;
	struct e1000_buffer *buffer_info;
	unsigned long size;
	unsigned int i;

	/* Free all the Tx ring sk_buffs */

	for(i = 0; i < tx_ring->count; i++) {
		buffer_info = &tx_ring->buffer_info[i];
		e1000_unmap_and_free_tx_resource(adapter, buffer_info);
	}

	size = sizeof(struct e1000_buffer) * tx_ring->count;
	memset(tx_ring->buffer_info, 0, size);

	/* Zero out the descriptor ring */

	memset(tx_ring->desc, 0, tx_ring->size);

	tx_ring->next_to_use = 0;
	tx_ring->next_to_clean = 0;

	E1000_WRITE_REG(&adapter->hw, TDH, 0);
	E1000_WRITE_REG(&adapter->hw, TDT, 0);
}

/**
 * e1000_free_rx_resources - Free Rx Resources
 * @adapter: board private structure
 *
 * Free all receive software resources
 **/

void
e1000_free_rx_resources(struct e1000_adapter *adapter)
{
	struct e1000_desc_ring *rx_ring = &adapter->rx_ring;
	struct pci_dev *pdev = adapter->pdev;

	e1000_clean_rx_ring(adapter);

	vfree(rx_ring->buffer_info);
	rx_ring->buffer_info = NULL;

	pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);

	rx_ring->desc = NULL;
}

/**
 * e1000_clean_rx_ring - Free Rx Buffers
 * @adapter: board private structure
 **/

static void
e1000_clean_rx_ring(struct e1000_adapter *adapter)
{
	struct e1000_desc_ring *rx_ring = &adapter->rx_ring;
	struct e1000_buffer *buffer_info;
	struct pci_dev *pdev = adapter->pdev;
	unsigned long size;
	unsigned int i;

	/* Free all the Rx ring sk_buffs */

	for(i = 0; i < rx_ring->count; i++) {
		buffer_info = &rx_ring->buffer_info[i];
		if(buffer_info->skb) {

			pci_unmap_single(pdev,
					 buffer_info->dma,
					 buffer_info->length,
					 PCI_DMA_FROMDEVICE);

			dev_kfree_skb(buffer_info->skb);
			buffer_info->skb = NULL;
		}
	}

	size = sizeof(struct e1000_buffer) * rx_ring->count;
	memset(rx_ring->buffer_info, 0, size);

	/* Zero out the descriptor ring */

	memset(rx_ring->desc, 0, rx_ring->size);

	rx_ring->next_to_clean = 0;
	rx_ring->next_to_use = 0;

	E1000_WRITE_REG(&adapter->hw, RDH, 0);
	E1000_WRITE_REG(&adapter->hw, RDT, 0);
}

/* The 82542 2.0 (revision 2) needs to have the receive unit in reset
 * and memory write and invalidate disabled for certain operations
 */
static void
e1000_enter_82542_rst(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	uint32_t rctl;

	e1000_pci_clear_mwi(&adapter->hw);

	rctl = E1000_READ_REG(&adapter->hw, RCTL);
	rctl |= E1000_RCTL_RST;
	E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
	E1000_WRITE_FLUSH(&adapter->hw);
	mdelay(5);

	if(netif_running(netdev))
		e1000_clean_rx_ring(adapter);
}

static void
e1000_leave_82542_rst(struct e1000_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	uint32_t rctl;

	rctl = E1000_READ_REG(&adapter->hw, RCTL);
	rctl &= ~E1000_RCTL_RST;
	E1000_WRITE_REG(&adapter->hw, RCTL, rctl);
	E1000_WRITE_FLUSH(&adapter->hw);
	mdelay(5);

	if(adapter->hw.pci_cmd_word & PCI_COMMAND_INVALIDATE)
		e1000_pci_set_mwi(&adapter->hw);

	if(netif_running(netdev)) {
		e1000_configure_rx(adapter);
		e1000_alloc_rx_buffers(adapter);
	}
}

/**
 * e1000_set_mac - Change the Ethernet Address of the NIC
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/

static int
e1000_set_mac(struct net_device *netdev, void *p)
{
	struct e1000_adapter *adapter = netdev->priv;
	struct sockaddr *addr = p;

	if(!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	/* 82542 2.0 needs to be in reset to write receive address registers */

	if(adapter->hw.mac_type == e1000_82542_rev2_0)
		e1000_enter_82542_rst(adapter);

	memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
	memcpy(adapter->hw.mac_addr, addr->sa_data, netdev->addr_len);

	e1000_rar_set(&adapter->hw, adapter->hw.mac_addr, 0);

	if(adapter->hw.mac_type == e1000_82542_rev2_0)
		e1000_leave_82542_rst(adapter);

	return 0;
}

/**
 * e1000_set_multi - Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The set_multi entry point is called whenever the multicast address
 * list or the network interface flags are updated.  This routine is
 * responsible for configuring the hardware for proper multicast,
 * promiscuous mode, and all-multi behavior.
 **/

static void
e1000_set_multi(struct net_device *netdev)
{
	struct e1000_adapter *adapter = netdev->priv;
	struct e1000_hw *hw = &adapter->hw;
	struct dev_mc_list *mc_ptr;
	uint32_t rctl;
	uint32_t hash_value;
	int i;
	unsigned long flags;

	/* Check for Promiscuous and All Multicast modes */

	spin_lock_irqsave(&adapter->tx_lock, flags);

	rctl = E1000_READ_REG(hw, RCTL);

	if(netdev->flags & IFF_PROMISC) {
		rctl |= (E1000_RCTL_UPE | E1000_RCTL_MPE);
	} else if(netdev->flags & IFF_ALLMULTI) {
		rctl |= E1000_RCTL_MPE;
		rctl &= ~E1000_RCTL_UPE;
	} else {
		rctl &= ~(E1000_RCTL_UPE | E1000_RCTL_MPE);
	}

	E1000_WRITE_REG(hw, RCTL, rctl);

	/* 82542 2.0 needs to be in reset to write receive address registers */

	if(hw->mac_type == e1000_82542_rev2_0)
		e1000_enter_82542_rst(adapter);

	/* load the first 14 multicast address into the exact filters 1-14
	 * RAR 0 is used for the station MAC adddress
	 * if there are not 14 addresses, go ahead and clear the filters
	 */
	mc_ptr = netdev->mc_list;

	for(i = 1; i < E1000_RAR_ENTRIES; i++) {
		if(mc_ptr) {
			e1000_rar_set(hw, mc_ptr->dmi_addr, i);
			mc_ptr = mc_ptr->next;
		} else {
			E1000_WRITE_REG_ARRAY(hw, RA, i << 1, 0);
			E1000_WRITE_REG_ARRAY(hw, RA, (i << 1) + 1, 0);
		}
	}

	/* clear the old settings from the multicast hash table */

	for(i = 0; i < E1000_NUM_MTA_REGISTERS; i++)
		E1000_WRITE_REG_ARRAY(hw, MTA, i, 0);

	/* load any remaining addresses into the hash table */

	for(; mc_ptr; mc_ptr = mc_ptr->next) {
		hash_value = e1000_hash_mc_addr(hw, mc_ptr->dmi_addr);
		e1000_mta_set(hw, hash_value);
	}

	if(hw->mac_type == e1000_82542_rev2_0)
		e1000_leave_82542_rst(adapter);

	spin_unlock_irqrestore(&adapter->tx_lock, flags);
}

/* Need to wait a few seconds after link up to get diagnostic information from
 * the phy */

static void
e1000_update_phy_info(unsigned long data)
{
	struct e1000_adapter *adapter = (struct e1000_adapter *) data;
	e1000_phy_get_info(&adapter->hw, &adapter->phy_info);
}

/**
 * e1000_82547_tx_fifo_stall - Timer Call-back
 * @data: pointer to adapter cast into an unsigned long
 **/

static void
e1000_82547_tx_fifo_stall(unsigned long data)
{
	struct e1000_adapter *adapter = (struct e1000_adapter *) data;
	struct net_device *netdev = adapter->netdev;
	uint32_t tctl;

	if(atomic_read(&adapter->tx_fifo_stall)) {
		if((E1000_READ_REG(&adapter->hw, TDT) ==
		    E1000_READ_REG(&adapter->hw, TDH)) &&
		   (E1000_READ_REG(&adapter->hw, TDFT) ==
		    E1000_READ_REG(&adapter->hw, TDFH)) &&
		   (E1000_READ_REG(&adapter->hw, TDFTS) ==
		    E1000_READ_REG(&adapter->hw, TDFHS))) {
			tctl = E1000_READ_REG(&adapter->hw, TCTL);
			E1000_WRITE_REG(&adapter->hw, TCTL,
					tctl & ~E1000_TCTL_EN);
			E1000_WRITE_REG(&adapter->hw, TDFT,
					adapter->tx_head_addr);
			E1000_WRITE_REG(&adapter->hw, TDFH,
					adapter->tx_head_addr);
			E1000_WRITE_REG(&adapter->hw, TDFTS,
					adapter->tx_head_addr);