ixgb_main.c

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/*******************************************************************************

  
  Copyright(c) 1999 - 2004 Intel Corporation. All rights reserved.
  
  This program is free software; you can redistribute it and/or modify it 
  under the terms of the GNU General Public License as published by the Free 
  Software Foundation; either version 2 of the License, or (at your option) 
  any later version.
  
  This program is distributed in the hope that it will be useful, but WITHOUT 
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
  more details.
  
  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc., 59 
  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  
  The full GNU General Public License is included in this distribution in the
  file called LICENSE.
  
  Contact Information:
  Linux NICS <[e-mail]>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

#include "ixgb.h"

char ixgb_driver_name[] = "ixgb";
char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
char ixgb_driver_version[] = "1.0.66";
char ixgb_copyright[] = "Copyright (c) 2001-2004 Intel Corporation.";

/* ixgb_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static struct pci_device_id ixgb_pci_tbl[] = {
	{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},

	/* required last entry */
	{0,}
};

MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);

/* Local Function Prototypes */

int ixgb_up(struct ixgb_adapter *adapter);
void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
void ixgb_reset(struct ixgb_adapter *adapter);

static int ixgb_init_module(void);
static void ixgb_exit_module(void);
static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
static void __devexit ixgb_remove(struct pci_dev *pdev);
static int ixgb_sw_init(struct ixgb_adapter *adapter);
static int ixgb_open(struct net_device *netdev);
static int ixgb_close(struct net_device *netdev);
static int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
static int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
static void ixgb_configure_tx(struct ixgb_adapter *adapter);
static void ixgb_configure_rx(struct ixgb_adapter *adapter);
static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
static void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
static void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
static void ixgb_set_multi(struct net_device *netdev);
static void ixgb_watchdog(unsigned long data);
static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
static int ixgb_set_mac(struct net_device *netdev, void *p);
static void ixgb_update_stats(struct ixgb_adapter *adapter);
static inline void ixgb_irq_disable(struct ixgb_adapter *adapter);
static inline void ixgb_irq_enable(struct ixgb_adapter *adapter);
static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
#ifdef CONFIG_IXGB_NAPI
static int ixgb_clean(struct net_device *netdev, int *budget);
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
				   int *work_done, int work_to_do);
#else
static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
#endif
static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
static int ixgb_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd);
static inline void ixgb_rx_checksum(struct ixgb_adapter *adapter,
				    struct ixgb_rx_desc *rx_desc,
				    struct sk_buff *skb);
static void ixgb_tx_timeout(struct net_device *dev);
static void ixgb_tx_timeout_task(struct net_device *dev);
static void ixgb_vlan_rx_register(struct net_device *netdev,
				  struct vlan_group *grp);
static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
static void ixgb_restore_vlan(struct ixgb_adapter *adapter);

static int ixgb_notify_reboot(struct notifier_block *, unsigned long event,
			      void *ptr);
static int ixgb_suspend(struct pci_dev *pdev, uint32_t state);

#ifdef CONFIG_NET_POLL_CONTROLLER
/* for netdump / net console */
static void ixgb_netpoll(struct net_device *dev);
#endif

struct notifier_block ixgb_notifier_reboot = {
	.notifier_call = ixgb_notify_reboot,
	.next = NULL,
	.priority = 0
};

/* Exported from other modules */

extern void ixgb_check_options(struct ixgb_adapter *adapter);
extern int ixgb_ethtool_ioctl(struct net_device *netdev, struct ifreq *ifr);

static struct pci_driver ixgb_driver = {
	.name = ixgb_driver_name,
	.id_table = ixgb_pci_tbl,
	.probe = ixgb_probe,
	.remove = __devexit_p(ixgb_remove),
	/* Power Managment Hooks */
	.suspend = NULL,
	.resume = NULL
};

MODULE_AUTHOR("Intel Corporation, <[e-mail]>");
MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
MODULE_LICENSE("GPL");

/* some defines for controlling descriptor fetches in h/w */
#define RXDCTL_PTHRESH_DEFAULT 128	/* chip considers prefech below this */
#define RXDCTL_HTHRESH_DEFAULT 16	/* chip will only prefetch if tail is 
					   pushed this many descriptors from head */
#define RXDCTL_WTHRESH_DEFAULT 16	/* chip writes back at this many or RXT0 */

/**
 * ixgb_init_module - Driver Registration Routine
 *
 * ixgb_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/

static int __init ixgb_init_module(void)
{
	int ret;
	printk(KERN_INFO "%s - version %s\n",
	       ixgb_driver_string, ixgb_driver_version);

	printk(KERN_INFO "%s\n", ixgb_copyright);

	ret = pci_module_init(&ixgb_driver);
	if (ret >= 0) {
		register_reboot_notifier(&ixgb_notifier_reboot);
	}
	return ret;
}

module_init(ixgb_init_module);

/**
 * ixgb_exit_module - Driver Exit Cleanup Routine
 *
 * ixgb_exit_module is called just before the driver is removed
 * from memory.
 **/

static void __exit ixgb_exit_module(void)
{
	unregister_reboot_notifier(&ixgb_notifier_reboot);
	pci_unregister_driver(&ixgb_driver);
}

module_exit(ixgb_exit_module);

int ixgb_up(struct ixgb_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int err;
	int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
	struct ixgb_hw *hw = &adapter->hw;

	/* hardware has been reset, we need to reload some things */

	ixgb_set_multi(netdev);

	ixgb_restore_vlan(adapter);

	ixgb_configure_tx(adapter);
	ixgb_setup_rctl(adapter);
	ixgb_configure_rx(adapter);
	ixgb_alloc_rx_buffers(adapter);

	if ((err = request_irq(adapter->pdev->irq, &ixgb_intr,
			       SA_SHIRQ | SA_SAMPLE_RANDOM,
			       netdev->name, netdev)))
		return err;

	/* disable interrupts and get the hardware into a known state */
	IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);

	if ((hw->max_frame_size != max_frame) ||
	    (hw->max_frame_size !=
	     (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {

		hw->max_frame_size = max_frame;

		IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);

		if (hw->max_frame_size >
		    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
			uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);

			if (!(ctrl0 & IXGB_CTRL0_JFE)) {
				ctrl0 |= IXGB_CTRL0_JFE;
				IXGB_WRITE_REG(hw, CTRL0, ctrl0);
			}
		}
	}

	mod_timer(&adapter->watchdog_timer, jiffies);
	ixgb_irq_enable(adapter);

	return 0;
}

void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
{
	struct net_device *netdev = adapter->netdev;

	ixgb_irq_disable(adapter);
	free_irq(adapter->pdev->irq, netdev);
	if (kill_watchdog)
		del_timer_sync(&adapter->watchdog_timer);
	adapter->link_speed = 0;
	adapter->link_duplex = 0;
	netif_carrier_off(netdev);
	netif_stop_queue(netdev);

	ixgb_reset(adapter);
	ixgb_clean_tx_ring(adapter);
	ixgb_clean_rx_ring(adapter);
}

void ixgb_reset(struct ixgb_adapter *adapter)
{

	ixgb_adapter_stop(&adapter->hw);
	if (!ixgb_init_hw(&adapter->hw))
		IXGB_DBG("ixgb_init_hw failed.\n");
}

/**
 * ixgb_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in ixgb_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * ixgb_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 **/

static int __devinit
ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct net_device *netdev = NULL;
	struct ixgb_adapter *adapter;
	static int cards_found = 0;
	unsigned long mmio_start;
	int mmio_len;
	int pci_using_dac;
	int i;
	int err;

	if ((err = pci_enable_device(pdev)))
		return err;

	if (!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
		pci_using_dac = 1;
	} else {
		if ((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK))) {
			IXGB_ERR("No usable DMA configuration, aborting\n");
			return err;
		}
		pci_using_dac = 0;
	}

	if ((err = pci_request_regions(pdev, ixgb_driver_name)))
		return err;

	pci_set_master(pdev);

	netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
	if (!netdev) {
		err = -ENOMEM;
		goto err_alloc_etherdev;
	}

	SET_MODULE_OWNER(netdev);
	SET_NETDEV_DEV(netdev, &pdev->dev);

	pci_set_drvdata(pdev, netdev);
	adapter = netdev->priv;
	adapter->netdev = netdev;
	adapter->pdev = pdev;
	adapter->hw.back = adapter;

	mmio_start = pci_resource_start(pdev, BAR_0);
	mmio_len = pci_resource_len(pdev, BAR_0);

	adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
	if (!adapter->hw.hw_addr) {
		err = -EIO;
		goto err_ioremap;
	}

	for (i = BAR_1; i <= BAR_5; i++) {
		if (pci_resource_len(pdev, i) == 0)
			continue;
		if (pci_resource_flags(pdev, i) & IORESOURCE_IO) {
			adapter->hw.io_base = pci_resource_start(pdev, i);
			break;
		}
	}

	netdev->open = &ixgb_open;
	netdev->stop = &ixgb_close;
	netdev->hard_start_xmit = &ixgb_xmit_frame;
	netdev->get_stats = &ixgb_get_stats;
	netdev->set_multicast_list = &ixgb_set_multi;
	netdev->set_mac_address = &ixgb_set_mac;
	netdev->change_mtu = &ixgb_change_mtu;
	netdev->do_ioctl = &ixgb_ioctl;
	netdev->tx_timeout = &ixgb_tx_timeout;
	netdev->watchdog_timeo = HZ;
#ifdef CONFIG_IXGB_NAPI
	netdev->poll = &ixgb_clean;
	netdev->weight = 64;
#endif
	netdev->vlan_rx_register = ixgb_vlan_rx_register;
	netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
	netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
#ifdef CONFIG_NET_POLL_CONTROLLER
	netdev->poll_controller = ixgb_netpoll;
#endif

	netdev->mem_start = mmio_start;
	netdev->mem_end = mmio_start + mmio_len;
	netdev->base_addr = adapter->hw.io_base;

	adapter->bd_number = cards_found;
	adapter->link_speed = 0;
	adapter->link_duplex = 0;

	/* setup the private structure */

	if ((err = ixgb_sw_init(adapter)))
		goto err_sw_init;

	netdev->features = NETIF_F_SG |
	    NETIF_F_HW_CSUM |
	    NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER;
#ifdef NETIF_F_TSO
	netdev->features |= NETIF_F_TSO;
#endif

	if (pci_using_dac)
		netdev->features |= NETIF_F_HIGHDMA;

	/* make sure the EEPROM is good */

	if (!ixgb_validate_eeprom_checksum(&adapter->hw)) {
		printk(KERN_ERR "The EEPROM Checksum Is Not Valid\n");
		err = -EIO;
		goto err_eeprom;
	}

	ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);

	if (!is_valid_ether_addr(netdev->dev_addr)) {
		err = -EIO;
		goto err_eeprom;
	}

	adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);

	init_timer(&adapter->watchdog_timer);
	adapter->watchdog_timer.function = &ixgb_watchdog;
	adapter->watchdog_timer.data = (unsigned long)adapter;

	INIT_WORK(&adapter->tx_timeout_task,
		  (void (*)(void *))ixgb_tx_timeout_task, netdev);

	if ((err = register_netdev(netdev)))
		goto err_register;

	/* we're going to reset, so assume we have no link for now */

	netif_carrier_off(netdev);
	netif_stop_queue(netdev);

	printk(KERN_INFO "%s: Intel(R) PRO/10GbE Network Connection\n",
	       netdev->name);
	ixgb_check_options(adapter);
	/* reset the hardware with the new settings */

	ixgb_reset(adapter);

	cards_found++;
	return 0;

      err_register:
      err_sw_init:
      err_eeprom:
	iounmap(adapter->hw.hw_addr);
      err_ioremap:
	free_netdev(netdev);
      err_alloc_etherdev:
	pci_release_regions(pdev);
	return err;
}

/**
 * ixgb_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * ixgb_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/

static void __devexit ixgb_remove(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct ixgb_adapter *adapter = netdev->priv;

	unregister_netdev(netdev);

	iounmap(adapter->hw.hw_addr);
	pci_release_regions(pdev);

	free_netdev(netdev);
}

/**
 * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 * @adapter: board private structure to initialize
 *
 * ixgb_sw_init initializes the Adapter private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 **/

static int __devinit ixgb_sw_init(struct ixgb_adapter *adapter)
{
	struct ixgb_hw *hw = &adapter->hw;
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;

	/* PCI config space info */

	hw->vendor_id = pdev->vendor;
	hw->device_id = pdev->device;
	hw->subsystem_vendor_id = pdev->subsystem_vendor;
	hw->subsystem_id = pdev->subsystem_device;

	adapter->rx_buffer_len = IXGB_RXBUFFER_2048;

	hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;

	if ((hw->device_id == IXGB_DEVICE_ID_82597EX)
	    || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
		hw->mac_type = ixgb_82597;
	else {
		/* should never have loaded on this device */
		printk(KERN_ERR "ixgb: unsupported device id\n");
	}

	/* enable flow control to be programmed */
	hw->fc.send_xon = 1;

	atomic_set(&adapter->irq_sem, 1);
	spin_lock_init(&adapter->tx_lock);

	return 0;
}

/**
 * ixgb_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 **/

static int ixgb_open(struct net_device *netdev)
{
	struct ixgb_adapter *adapter = netdev->priv;
	int err;

	/* allocate transmit descriptors */

	if ((err = ixgb_setup_tx_resources(adapter)))
		goto err_setup_tx;

	/* allocate receive descriptors */

	if ((err = ixgb_setup_rx_resources(adapter)))
		goto err_setup_rx;

	if ((err = ixgb_up(adapter)))
		goto err_up;

	return 0;

      err_up:
	ixgb_free_rx_resources(adapter);