drivers/net/igb/igb_main.c



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

  Intel(R) Gigabit Ethernet Linux driver
  Copyright(c) 2007-2009 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope 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.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

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

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/netdevice.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <linux/net_tstamp.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/aer.h>
#ifdef CONFIG_IGB_DCA
#include <linux/dca.h>
#endif
#include "igb.h"

#define DRV_VERSION "2.1.0-k2"
char igb_driver_name[] = "igb";
char igb_driver_version[] = DRV_VERSION;
static const char igb_driver_string[] =
				"Intel(R) Gigabit Ethernet Network Driver";
static const char igb_copyright[] = "Copyright (c) 2007-2009 Intel Corporation.";

static const struct e1000_info *igb_info_tbl[] = {
	[board_82575] = &e1000_82575_info,
};

static DEFINE_PCI_DEVICE_TABLE(igb_pci_tbl) = {
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_COPPER), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_FIBER), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_SERDES), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_SGMII), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_COPPER), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_FIBER), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_SERDES), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_SGMII), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82580_COPPER_DUAL), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_NS), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_NS_SERDES), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_FIBER), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_SERDES), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_SERDES_QUAD), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_QUAD_COPPER_ET2), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_QUAD_COPPER), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82575EB_COPPER), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82575EB_FIBER_SERDES), board_82575 },
	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82575GB_QUAD_COPPER), board_82575 },
	/* required last entry */
	{0, }
};

MODULE_DEVICE_TABLE(pci, igb_pci_tbl);

void igb_reset(struct igb_adapter *);
static int igb_setup_all_tx_resources(struct igb_adapter *);
static int igb_setup_all_rx_resources(struct igb_adapter *);
static void igb_free_all_tx_resources(struct igb_adapter *);
static void igb_free_all_rx_resources(struct igb_adapter *);
static void igb_setup_mrqc(struct igb_adapter *);
void igb_update_stats(struct igb_adapter *);
static int igb_probe(struct pci_dev *, const struct pci_device_id *);
static void __devexit igb_remove(struct pci_dev *pdev);
static int igb_sw_init(struct igb_adapter *);
static int igb_open(struct net_device *);
static int igb_close(struct net_device *);
static void igb_configure_tx(struct igb_adapter *);
static void igb_configure_rx(struct igb_adapter *);
static void igb_clean_all_tx_rings(struct igb_adapter *);
static void igb_clean_all_rx_rings(struct igb_adapter *);
static void igb_clean_tx_ring(struct igb_ring *);
static void igb_clean_rx_ring(struct igb_ring *);
static void igb_set_rx_mode(struct net_device *);
static void igb_update_phy_info(unsigned long);
static void igb_watchdog(unsigned long);
static void igb_watchdog_task(struct work_struct *);
static netdev_tx_t igb_xmit_frame_adv(struct sk_buff *skb, struct net_device *);
static struct net_device_stats *igb_get_stats(struct net_device *);
static int igb_change_mtu(struct net_device *, int);
static int igb_set_mac(struct net_device *, void *);
static void igb_set_uta(struct igb_adapter *adapter);
static irqreturn_t igb_intr(int irq, void *);
static irqreturn_t igb_intr_msi(int irq, void *);
static irqreturn_t igb_msix_other(int irq, void *);
static irqreturn_t igb_msix_ring(int irq, void *);
#ifdef CONFIG_IGB_DCA
static void igb_update_dca(struct igb_q_vector *);
static void igb_setup_dca(struct igb_adapter *);
#endif /* CONFIG_IGB_DCA */
static bool igb_clean_tx_irq(struct igb_q_vector *);
static int igb_poll(struct napi_struct *, int);
static bool igb_clean_rx_irq_adv(struct igb_q_vector *, int *, int);
static int igb_ioctl(struct net_device *, struct ifreq *, int cmd);
static void igb_tx_timeout(struct net_device *);
static void igb_reset_task(struct work_struct *);
static void igb_vlan_rx_register(struct net_device *, struct vlan_group *);
static void igb_vlan_rx_add_vid(struct net_device *, u16);
static void igb_vlan_rx_kill_vid(struct net_device *, u16);
static void igb_restore_vlan(struct igb_adapter *);
static void igb_rar_set_qsel(struct igb_adapter *, u8 *, u32 , u8);
static void igb_ping_all_vfs(struct igb_adapter *);
static void igb_msg_task(struct igb_adapter *);
static void igb_vmm_control(struct igb_adapter *);
static int igb_set_vf_mac(struct igb_adapter *, int, unsigned char *);
static void igb_restore_vf_multicasts(struct igb_adapter *adapter);
static int igb_ndo_set_vf_mac(struct net_device *netdev, int vf, u8 *mac);
static int igb_ndo_set_vf_vlan(struct net_device *netdev,
			       int vf, u16 vlan, u8 qos);
static int igb_ndo_set_vf_bw(struct net_device *netdev, int vf, int tx_rate);
static int igb_ndo_get_vf_config(struct net_device *netdev, int vf,
				 struct ifla_vf_info *ivi);

#ifdef CONFIG_PM
static int igb_suspend(struct pci_dev *, pm_message_t);
static int igb_resume(struct pci_dev *);
#endif
static void igb_shutdown(struct pci_dev *);
#ifdef CONFIG_IGB_DCA
static int igb_notify_dca(struct notifier_block *, unsigned long, void *);
static struct notifier_block dca_notifier = {
	.notifier_call	= igb_notify_dca,
	.next		= NULL,
	.priority	= 0
};
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
/* for netdump / net console */
static void igb_netpoll(struct net_device *);
#endif
#ifdef CONFIG_PCI_IOV
static unsigned int max_vfs = 0;
module_param(max_vfs, uint, 0);
MODULE_PARM_DESC(max_vfs, "Maximum number of virtual functions to allocate "
                 "per physical function");
#endif /* CONFIG_PCI_IOV */

static pci_ers_result_t igb_io_error_detected(struct pci_dev *,
		     pci_channel_state_t);
static pci_ers_result_t igb_io_slot_reset(struct pci_dev *);
static void igb_io_resume(struct pci_dev *);

static struct pci_error_handlers igb_err_handler = {
	.error_detected = igb_io_error_detected,
	.slot_reset = igb_io_slot_reset,
	.resume = igb_io_resume,
};


static struct pci_driver igb_driver = {
	.name     = igb_driver_name,
	.id_table = igb_pci_tbl,
	.probe    = igb_probe,
	.remove   = __devexit_p(igb_remove),
#ifdef CONFIG_PM
	/* Power Managment Hooks */
	.suspend  = igb_suspend,
	.resume   = igb_resume,
#endif
	.shutdown = igb_shutdown,
	.err_handler = &igb_err_handler
};

MODULE_AUTHOR("Intel Corporation, <e1000-devel@lists.sourceforge.net>");
MODULE_DESCRIPTION("Intel(R) Gigabit Ethernet Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

struct igb_reg_info {
	u32 ofs;
	char *name;
};

static const struct igb_reg_info igb_reg_info_tbl[] = {

	/* General Registers */
	{E1000_CTRL, "CTRL"},
	{E1000_STATUS, "STATUS"},
	{E1000_CTRL_EXT, "CTRL_EXT"},

	/* Interrupt Registers */
	{E1000_ICR, "ICR"},

	/* RX Registers */
	{E1000_RCTL, "RCTL"},
	{E1000_RDLEN(0), "RDLEN"},
	{E1000_RDH(0), "RDH"},
	{E1000_RDT(0), "RDT"},
	{E1000_RXDCTL(0), "RXDCTL"},
	{E1000_RDBAL(0), "RDBAL"},
	{E1000_RDBAH(0), "RDBAH"},

	/* TX Registers */
	{E1000_TCTL, "TCTL"},
	{E1000_TDBAL(0), "TDBAL"},
	{E1000_TDBAH(0), "TDBAH"},
	{E1000_TDLEN(0), "TDLEN"},
	{E1000_TDH(0), "TDH"},
	{E1000_TDT(0), "TDT"},
	{E1000_TXDCTL(0), "TXDCTL"},
	{E1000_TDFH, "TDFH"},
	{E1000_TDFT, "TDFT"},
	{E1000_TDFHS, "TDFHS"},
	{E1000_TDFPC, "TDFPC"},

	/* List Terminator */
	{}
};

/*
 * igb_regdump - register printout routine
 */
static void igb_regdump(struct e1000_hw *hw, struct igb_reg_info *reginfo)
{
	int n = 0;
	char rname[16];
	u32 regs[8];

	switch (reginfo->ofs) {
	case E1000_RDLEN(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_RDLEN(n));
		break;
	case E1000_RDH(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_RDH(n));
		break;
	case E1000_RDT(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_RDT(n));
		break;
	case E1000_RXDCTL(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_RXDCTL(n));
		break;
	case E1000_RDBAL(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_RDBAL(n));
		break;
	case E1000_RDBAH(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_RDBAH(n));
		break;
	case E1000_TDBAL(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_RDBAL(n));
		break;
	case E1000_TDBAH(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_TDBAH(n));
		break;
	case E1000_TDLEN(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_TDLEN(n));
		break;
	case E1000_TDH(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_TDH(n));
		break;
	case E1000_TDT(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_TDT(n));
		break;
	case E1000_TXDCTL(0):
		for (n = 0; n < 4; n++)
			regs[n] = rd32(E1000_TXDCTL(n));
		break;
	default:
		printk(KERN_INFO "%-15s %08x\n",
			reginfo->name, rd32(reginfo->ofs));
		return;
	}

	snprintf(rname, 16, "%s%s", reginfo->name, "[0-3]");
	printk(KERN_INFO "%-15s ", rname);
	for (n = 0; n < 4; n++)
		printk(KERN_CONT "%08x ", regs[n]);
	printk(KERN_CONT "\n");
}

/*
 * igb_dump - Print registers, tx-rings and rx-rings
 */
static void igb_dump(struct igb_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	struct igb_reg_info *reginfo;
	int n = 0;
	struct igb_ring *tx_ring;
	union e1000_adv_tx_desc *tx_desc;
	struct my_u0 { u64 a; u64 b; } *u0;
	struct igb_buffer *buffer_info;
	struct igb_ring *rx_ring;
	union e1000_adv_rx_desc *rx_desc;
	u32 staterr;
	int i = 0;

	if (!netif_msg_hw(adapter))
		return;

	/* Print netdevice Info */
	if (netdev) {
		dev_info(&adapter->pdev->dev, "Net device Info\n");
		printk(KERN_INFO "Device Name     state            "
			"trans_start      last_rx\n");
		printk(KERN_INFO "%-15s %016lX %016lX %016lX\n",
		netdev->name,
		netdev->state,
		netdev->trans_start,
		netdev->last_rx);
	}

	/* Print Registers */
	dev_info(&adapter->pdev->dev, "Register Dump\n");
	printk(KERN_INFO " Register Name   Value\n");
	for (reginfo = (struct igb_reg_info *)igb_reg_info_tbl;
	     reginfo->name; reginfo++) {
		igb_regdump(hw, reginfo);
	}

	/* Print TX Ring Summary */
	if (!netdev || !netif_running(netdev))
		goto exit;

	dev_info(&adapter->pdev->dev, "TX Rings Summary\n");
	printk(KERN_INFO "Queue [NTU] [NTC] [bi(ntc)->dma  ]"
		" leng ntw timestamp\n");
	for (n = 0; n < adapter->num_tx_queues; n++) {
		tx_ring = adapter->tx_ring[n];
		buffer_info = &tx_ring->buffer_info[tx_ring->next_to_clean];
		printk(KERN_INFO " %5d %5X %5X %016llX %04X %3X %016llX\n",
			   n, tx_ring->next_to_use, tx_ring->next_to_clean,
			   (u64)buffer_info->dma,
			   buffer_info->length,
			   buffer_info->next_to_watch,
			   (u64)buffer_info->time_stamp);
	}

	/* Print TX Rings */
	if (!netif_msg_tx_done(adapter))
		goto rx_ring_summary;

	dev_info(&adapter->pdev->dev, "TX Rings Dump\n");

	/* Transmit Descriptor Formats
	 *
	 * Advanced Transmit Descriptor
	 *   +--------------------------------------------------------------+
	 * 0 |         Buffer Address [63:0]                                |
	 *   +--------------------------------------------------------------+
	 * 8 | PAYLEN  | PORTS  |CC|IDX | STA | DCMD  |DTYP|MAC|RSV| DTALEN |
	 *   +--------------------------------------------------------------+
	 *   63      46 45    40 39 38 36 35 32 31   24             15       0
	 */

	for (n = 0; n < adapter->num_tx_queues; n++) {
		tx_ring = adapter->tx_ring[n];
		printk(KERN_INFO "------------------------------------\n");
		printk(KERN_INFO "TX QUEUE INDEX = %d\n", tx_ring->queue_index);
		printk(KERN_INFO "------------------------------------\n");
		printk(KERN_INFO "T [desc]     [address 63:0  ] "
			"[PlPOCIStDDM Ln] [bi->dma       ] "
			"leng  ntw timestamp        bi->skb\n");

		for (i = 0; tx_ring->desc && (i < tx_ring->count); i++) {
			tx_desc = E1000_TX_DESC_ADV(*tx_ring, i);
			buffer_info = &tx_ring->buffer_info[i];
			u0 = (struct my_u0 *)tx_desc;
			printk(KERN_INFO "T [0x%03X]    %016llX %016llX %016llX"
				" %04X  %3X %016llX %p", i,
				le64_to_cpu(u0->a),
				le64_to_cpu(u0->b),
				(u64)buffer_info->dma,
				buffer_info->length,
				buffer_info->next_to_watch,
				(u64)buffer_info->time_stamp,
				buffer_info->skb);
			if (i == tx_ring->next_to_use &&
				i == tx_ring->next_to_clean)
				printk(KERN_CONT " NTC/U\n");
			else if (i == tx_ring->next_to_use)
				printk(KERN_CONT " NTU\n");
			else if (i == tx_ring->next_to_clean)
				printk(KERN_CONT " NTC\n");
			else
				printk(KERN_CONT "\n");

			if (netif_msg_pktdata(adapter) && buffer_info->dma != 0)
				print_hex_dump(KERN_INFO, "",
					DUMP_PREFIX_ADDRESS,
					16, 1, phys_to_virt(buffer_info->dma),
					buffer_info->length, true);
		}
	}

	/* Print RX Rings Summary */
rx_ring_summary:
	dev_info(&adapter->pdev->dev, "RX Rings Summary\n");
	printk(KERN_INFO "Queue [NTU] [NTC]\n");
	for (n = 0; n < adapter->num_rx_queues; n++) {
		rx_ring = adapter->rx_ring[n];
		printk(KERN_INFO " %5d %5X %5X\n", n,
			   rx_ring->next_to_use, rx_ring->next_to_clean);
	}

	/* Print RX Rings */
	if (!netif_msg_rx_status(adapter))
		goto exit;

	dev_info(&adapter->pdev->dev, "RX Rings Dump\n");

	/* Advanced Receive Descriptor (Read) Format
	 *    63                                           1        0
	 *    +-----------------------------------------------------+
	 *  0 |       Packet Buffer Address [63:1]           |A0/NSE|
	 *    +----------------------------------------------+------+
	 *  8 |       Header Buffer Address [63:1]           |  DD  |
	 *    +-----------------------------------------------------+
	 *
	 *
	 * Advanced Receive Descriptor (Write-Back) Format
	 *
	 *   63       48 47    32 31  30      21 20 17 16   4 3     0
	 *   +------------------------------------------------------+
	 * 0 | Packet     IP     |SPH| HDR_LEN   | RSV|Packet|  RSS |
	 *   | Checksum   Ident  |   |           |    | Type | Type |
	 *   +------------------------------------------------------+
	 * 8 | VLAN Tag | Length | Extended Error | Extended Status |
	 *   +------------------------------------------------------+
	 *   63       48 47    32 31            20 19               0
	 */

	for (n = 0; n < adapter->num_rx_queues; n++) {
		rx_ring = adapter->rx_ring[n];
		printk(KERN_INFO "------------------------------------\n");
		printk(KERN_INFO "RX QUEUE INDEX = %d\n", rx_ring->queue_index);
		printk(KERN_INFO "------------------------------------\n");
		printk(KERN_INFO "R  [desc]      [ PktBuf     A0] "
			"[  HeadBuf   DD] [bi->dma       ] [bi->skb] "
			"<-- Adv Rx Read format\n");
		printk(KERN_INFO "RWB[desc]      [PcsmIpSHl PtRs] "
			"[vl er S cks ln] ---------------- [bi->skb] "
			"<-- Adv Rx Write-Back format\n");

		for (i = 0; i < rx_ring->count; i++) {
			buffer_info = &rx_ring->buffer_info[i];
			rx_desc = E1000_RX_DESC_ADV(*rx_ring, i);
			u0 = (struct my_u0 *)rx_desc;
			staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
			if (staterr & E1000_RXD_STAT_DD) {
				/* Descriptor Done */
				printk(KERN_INFO "RWB[0x%03X]     %016llX "
					"%016llX ---------------- %p", i,
					le64_to_cpu(u0->a),
					le64_to_cpu(u0->b),
					buffer_info->skb);
			} else {
				printk(KERN_INFO "R  [0x%03X]     %016llX "
					"%016llX %016llX %p", i,
					le64_to_cpu(u0->a),
					le64_to_cpu(u0->b),
					(u64)buffer_info->dma,
					buffer_info->skb);

				if (netif_msg_pktdata(adapter)) {
					print_hex_dump(KERN_INFO, "",
						DUMP_PREFIX_ADDRESS,
						16, 1,
						phys_to_virt(buffer_info->dma),
						rx_ring->rx_buffer_len, true);
					if (rx_ring->rx_buffer_len
						< IGB_RXBUFFER_1024)
						print_hex_dump(KERN_INFO, "",
						  DUMP_PREFIX_ADDRESS,
						  16, 1,
						  phys_to_virt(
						    buffer_info->page_dma +
						    buffer_info->page_offset),
						  PAGE_SIZE/2, true);
				}
			}

			if (i == rx_ring->next_to_use)
				printk(KERN_CONT " NTU\n");
			else if (i == rx_ring->next_to_clean)
				printk(KERN_CONT " NTC\n");
			else
				printk(KERN_CONT "\n");

		}
	}

exit:
	return;
}


/**
 * igb_read_clock - read raw cycle counter (to be used by time counter)
 */
static cycle_t igb_read_clock(const struct cyclecounter *tc)
{
	struct igb_adapter *adapter =
		container_of(tc, struct igb_adapter, cycles);
	struct e1000_hw *hw = &adapter->hw;
	u64 stamp = 0;
	int shift = 0;

	/*
	 * The timestamp latches on lowest register read. For the 82580
	 * the lowest register is SYSTIMR instead of SYSTIML.  However we never
	 * adjusted TIMINCA so SYSTIMR will just read as all 0s so ignore it.
	 */
	if (hw->mac.type == e1000_82580) {
		stamp = rd32(E1000_SYSTIMR) >> 8;
		shift = IGB_82580_TSYNC_SHIFT;
	}

	stamp |= (u64)rd32(E1000_SYSTIML) << shift;
	stamp |= (u64)rd32(E1000_SYSTIMH) << (shift + 32);
	return stamp;
}

/**
 * igb_get_hw_dev - return device
 * used by hardware layer to print debugging information
 **/
struct net_device *igb_get_hw_dev(struct e1000_hw *hw)
{
	struct igb_adapter *adapter = hw->back;
	return adapter->netdev;
}

/**
 * igb_init_module - Driver Registration Routine
 *
 * igb_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/
static int __init igb_init_module(void)
{
	int ret;
	printk(KERN_INFO "%s - version %s\n",
	       igb_driver_string, igb_driver_version);

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

#ifdef CONFIG_IGB_DCA
	dca_register_notify(&dca_notifier);
#endif
	ret = pci_register_driver(&igb_driver);
	return ret;
}

module_init(igb_init_module);

/**
 * igb_exit_module - Driver Exit Cleanup Routine
 *
 * igb_exit_module is called just before the driver is removed
 * from memory.
 **/
static void __exit igb_exit_module(void)
{
#ifdef CONFIG_IGB_DCA
	dca_unregister_notify(&dca_notifier);
#endif
	pci_unregister_driver(&igb_driver);
}

module_exit(igb_exit_module);

#define Q_IDX_82576(i) (((i & 0x1) << 3) + (i >> 1))
/**
 * igb_cache_ring_register - Descriptor ring to register mapping
 * @adapter: board private structure to initialize
 *
 * Once we know the feature-set enabled for the device, we'll cache
 * the register offset the descriptor ring is assigned to.
 **/
static void igb_cache_ring_register(struct igb_adapter *adapter)
{
	int i = 0, j = 0;
	u32 rbase_offset = adapter->vfs_allocated_count;

	switch (adapter->hw.mac.type) {
	case e1000_82576:
		/* The queues are allocated for virtualization such that VF 0
		 * is allocated queues 0 and 8, VF 1 queues 1 and 9, etc.
		 * In order to avoid collision we start at the first free queue
		 * and continue consuming queues in the same sequence
		 */
		if (adapter->vfs_allocated_count) {
			for (; i < adapter->rss_queues; i++)
				adapter->rx_ring[i]->reg_idx = rbase_offset +
				                               Q_IDX_82576(i);
			for (; j < adapter->rss_queues; j++)
				adapter->tx_ring[j]->reg_idx = rbase_offset +
				                               Q_IDX_82576(j);
		}
	case e1000_82575:
	case e1000_82580:
	case e1000_i350:
	default:
		for (; i < adapter->num_rx_queues; i++)
			adapter->rx_ring[i]->reg_idx = rbase_offset + i;
		for (; j < adapter->num_tx_queues; j++)
			adapter->tx_ring[j]->reg_idx = rbase_offset + j;
		break;
	}
}

static void igb_free_queues(struct igb_adapter *adapter)
{
	int i;

	for (i = 0; i < adapter->num_tx_queues; i++) {
		kfree(adapter->tx_ring[i]);
		adapter->tx_ring[i] = NULL;
	}
	for (i = 0; i < adapter->num_rx_queues; i++) {
		kfree(adapter->rx_ring[i]);
		adapter->rx_ring[i] = NULL;
	}
	adapter->num_rx_queues = 0;
	adapter->num_tx_queues = 0;
}

/**
 * igb_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 * We allocate one ring per queue at run-time since we don't know the
 * number of queues at compile-time.
 **/
static int igb_alloc_queues(struct igb_adapter *adapter)
{
	struct igb_ring *ring;
	int i;

	for (i = 0; i < adapter->num_tx_queues; i++) {
		ring = kzalloc(sizeof(struct igb_ring), GFP_KERNEL);
		if (!ring)
			goto err;
		ring->count = adapter->tx_ring_count;
		ring->queue_index = i;
		ring->dev = &adapter->pdev->dev;
		ring->netdev = adapter->netdev;
		/* For 82575, context index must be unique per ring. */
		if (adapter->hw.mac.type == e1000_82575)
			ring->flags = IGB_RING_FLAG_TX_CTX_IDX;
		adapter->tx_ring[i] = ring;
	}

	for (i = 0; i < adapter->num_rx_queues; i++) {
		ring = kzalloc(sizeof(struct igb_ring), GFP_KERNEL);
		if (!ring)
			goto err;
		ring->count = adapter->rx_ring_count;
		ring->queue_index = i;
		ring->dev = &adapter->pdev->dev;
		ring->netdev = adapter->netdev;
		ring->rx_buffer_len = MAXIMUM_ETHERNET_VLAN_SIZE;
		ring->flags = IGB_RING_FLAG_RX_CSUM; /* enable rx checksum */
		/* set flag indicating ring supports SCTP checksum offload */
		if (adapter->hw.mac.type >= e1000_82576)
			ring->flags |= IGB_RING_FLAG_RX_SCTP_CSUM;
		adapter->rx_ring[i] = ring;
	}

	igb_cache_ring_register(adapter);

	return 0;

err:
	igb_free_queues(adapter);

	return -ENOMEM;
}

#define IGB_N0_QUEUE -1
static void igb_assign_vector(struct igb_q_vector *q_vector, int msix_vector)
{
	u32 msixbm = 0;
	struct igb_adapter *adapter = q_vector->adapter;
	struct e1000_hw *hw = &adapter->hw;
	u32 ivar, index;
	int rx_queue = IGB_N0_QUEUE;
	int tx_queue = IGB_N0_QUEUE;

	if (q_vector->rx_ring)
		rx_queue = q_vector->rx_ring->reg_idx;
	if (q_vector->tx_ring)
		tx_queue = q_vector->tx_ring->reg_idx;

	switch (hw->mac.type) {
	case e1000_82575:
		/* The 82575 assigns vectors using a bitmask, which matches the
		   bitmask for the EICR/EIMS/EIMC registers.  To assign one
		   or more queues to a vector, we write the appropriate bits
		   into the MSIXBM register for that vector. */
		if (rx_queue > IGB_N0_QUEUE)
			msixbm = E1000_EICR_RX_QUEUE0 << rx_queue;
		if (tx_queue > IGB_N0_QUEUE)
			msixbm |= E1000_EICR_TX_QUEUE0 << tx_queue;
		if (!adapter->msix_entries && msix_vector == 0)
			msixbm |= E1000_EIMS_OTHER;
		array_wr32(E1000_MSIXBM(0), msix_vector, msixbm);
		q_vector->eims_value = msixbm;
		break;
	case e1000_82576:
		/* 82576 uses a table-based method for assigning vectors.
		   Each queue has a single entry in the table to which we write
		   a vector number along with a "valid" bit.  Sadly, the layout
		   of the table is somewhat counterintuitive. */
		if (rx_queue > IGB_N0_QUEUE) {
			index = (rx_queue & 0x7);
			ivar = array_rd32(E1000_IVAR0, index);
			if (rx_queue < 8) {
				/* vector goes into low byte of register */
				ivar = ivar & 0xFFFFFF00;
				ivar |= msix_vector | E1000_IVAR_VALID;
			} else {
				/* vector goes into third byte of register */
				ivar = ivar & 0xFF00FFFF;
				ivar |= (msix_vector | E1000_IVAR_VALID) << 16;
			}
			array_wr32(E1000_IVAR0, index, ivar);
		}
		if (tx_queue > IGB_N0_QUEUE) {
			index = (tx_queue & 0x7);
			ivar = array_rd32(E1000_IVAR0, index);
			if (tx_queue < 8) {
				/* vector goes into second byte of register */
				ivar = ivar & 0xFFFF00FF;
				ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
			} else {
				/* vector goes into high byte of register */
				ivar = ivar & 0x00FFFFFF;
				ivar |= (msix_vector | E1000_IVAR_VALID) << 24;
			}
			array_wr32(E1000_IVAR0, index, ivar);
		}
		q_vector->eims_value = 1 << msix_vector;
		break;
	case e1000_82580:
	case e1000_i350:
		/* 82580 uses the same table-based approach as 82576 but has fewer
		   entries as a result we carry over for queues greater than 4. */
		if (rx_queue > IGB_N0_QUEUE) {
			index = (rx_queue >> 1);
			ivar = array_rd32(E1000_IVAR0, index);
			if (rx_queue & 0x1) {
				/* vector goes into third byte of register */
				ivar = ivar & 0xFF00FFFF;
				ivar |= (msix_vector | E1000_IVAR_VALID) << 16;
			} else {
				/* vector goes into low byte of register */
				ivar = ivar & 0xFFFFFF00;
				ivar |= msix_vector | E1000_IVAR_VALID;
			}
			array_wr32(E1000_IVAR0, index, ivar);
		}
		if (tx_queue > IGB_N0_QUEUE) {
			index = (tx_queue >> 1);
			ivar = array_rd32(E1000_IVAR0, index);
			if (tx_queue & 0x1) {
				/* vector goes into high byte of register */
				ivar = ivar & 0x00FFFFFF;
				ivar |= (msix_vector | E1000_IVAR_VALID) << 24;
			} else {
				/* vector goes into second byte of register */
				ivar = ivar & 0xFFFF00FF;
				ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
			}
			array_wr32(E1000_IVAR0, index, ivar);
		}
		q_vector->eims_value = 1 << msix_vector;
		break;
	default:
		BUG();
		break;
	}

	/* add q_vector eims value to global eims_enable_mask */
	adapter->eims_enable_mask |= q_vector->eims_value;

	/* configure q_vector to set itr on first interrupt */
	q_vector->set_itr = 1;
}

/**
 * igb_configure_msix - Configure MSI-X hardware
 *
 * igb_configure_msix sets up the hardware to properly
 * generate MSI-X interrupts.
 **/
static void igb_configure_msix(struct igb_adapter *adapter)
{
	u32 tmp;
	int i, vector = 0;
	struct e1000_hw *hw = &adapter->hw;

	adapter->eims_enable_mask = 0;

	/* set vector for other causes, i.e. link changes */
	switch (hw->mac.type) {
	case e1000_82575:
		tmp = rd32(E1000_CTRL_EXT);
		/* enable MSI-X PBA support*/
		tmp |= E1000_CTRL_EXT_PBA_CLR;

		/* Auto-Mask interrupts upon ICR read. */
		tmp |= E1000_CTRL_EXT_EIAME;
		tmp |= E1000_CTRL_EXT_IRCA;

		wr32(E1000_CTRL_EXT, tmp);

		/* enable msix_other interrupt */
		array_wr32(E1000_MSIXBM(0), vector++,
		                      E1000_EIMS_OTHER);
		adapter->eims_other = E1000_EIMS_OTHER;

		break;

	case e1000_82576:
	case e1000_82580:
	case e1000_i350:
		/* Turn on MSI-X capability first, or our settings
		 * won't stick.  And it will take days to debug. */
		wr32(E1000_GPIE, E1000_GPIE_MSIX_MODE |
		                E1000_GPIE_PBA | E1000_GPIE_EIAME |
		                E1000_GPIE_NSICR);

		/* enable msix_other interrupt */
		adapter->eims_other = 1 << vector;
		tmp = (vector++ | E1000_IVAR_VALID) << 8;

		wr32(E1000_IVAR_MISC, tmp);
		break;
	default:
		/* do nothing, since nothing else supports MSI-X */
		break;
	} /* switch (hw->mac.type) */

	adapter->eims_enable_mask |= adapter->eims_other;

	for (i = 0; i < adapter->num_q_vectors; i++)
		igb_assign_vector(adapter->q_vector[i], vector++);

	wrfl();
}

/**
 * igb_request_msix - Initialize MSI-X interrupts
 *
 * igb_request_msix allocates MSI-X vectors and requests interrupts from the
 * kernel.
 **/
static int igb_request_msix(struct igb_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	int i, err = 0, vector = 0;

	err = request_irq(adapter->msix_entries[vector].vector,
	                  igb_msix_other, 0, netdev->name, adapter);
	if (err)
		goto out;
	vector++;

	for (i = 0; i < adapter->num_q_vectors; i++) {
		struct igb_q_vector *q_vector = adapter->q_vector[i];

		q_vector->itr_register = hw->hw_addr + E1000_EITR(vector);

		if (q_vector->rx_ring && q_vector->tx_ring)
			sprintf(q_vector->name, "%s-TxRx-%u", netdev->name,
			        q_vector->rx_ring->queue_index);
		else if (q_vector->tx_ring)
			sprintf(q_vector->name, "%s-tx-%u", netdev->name,
			        q_vector->tx_ring->queue_index);
		else if (q_vector->rx_ring)
			sprintf(q_vector->name, "%s-rx-%u", netdev->name,
			        q_vector->rx_ring->queue_index);
		else
			sprintf(q_vector->name, "%s-unused", netdev->name);

		err = request_irq(adapter->msix_entries[vector].vector,
		                  igb_msix_ring, 0, q_vector->name,
		                  q_vector);
		if (err)
			goto out;
		vector++;
	}

	igb_configure_msix(adapter);
	return 0;
out:
	return err;
}

static void igb_reset_interrupt_capability(struct igb_adapter *adapter)
{
	if (adapter->msix_entries) {
		pci_disable_msix(adapter->pdev);
		kfree(adapter->msix_entries);
		adapter->msix_entries = NULL;
	} else if (adapter->flags & IGB_FLAG_HAS_MSI) {
		pci_disable_msi(adapter->pdev);
	}
}

/**
 * igb_free_q_vectors - Free memory allocated for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * This function frees the memory allocated to the q_vectors.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void igb_free_q_vectors(struct igb_adapter *adapter)
{
	int v_idx;

	for (v_idx = 0; v_idx < adapter->num_q_vectors; v_idx++) {
		struct igb_q_vector *q_vector = adapter->q_vector[v_idx];
		adapter->q_vector[v_idx] = NULL;
		if (!q_vector)
			continue;
		netif_napi_del(&q_vector->napi);
		kfree(q_vector);
	}
	adapter->num_q_vectors = 0;
}

/**
 * igb_clear_interrupt_scheme - reset the device to a state of no interrupts
 *
 * This function resets the device so that it has 0 rx queues, tx queues, and
 * MSI-X interrupts allocated.
 */
static void igb_clear_interrupt_scheme(struct igb_adapter *adapter)
{
	igb_free_queues(adapter);
	igb_free_q_vectors(adapter);
	igb_reset_interrupt_capability(adapter);
}

/**
 * igb_set_interrupt_capability - set MSI or MSI-X if supported
 *
 * Attempt to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static void igb_set_interrupt_capability(struct igb_adapter *adapter)
{
	int err;
	int numvecs, i;

	/* Number of supported queues. */
	adapter->num_rx_queues = adapter->rss_queues;
	adapter->num_tx_queues = adapter->rss_queues;

	/* start with one vector for every rx queue */
	numvecs = adapter->num_rx_queues;

	/* if tx handler is separate add 1 for every tx queue */
	if (!(adapter->flags & IGB_FLAG_QUEUE_PAIRS))
		numvecs += adapter->num_tx_queues;

	/* store the number of vectors reserved for queues */
	adapter->num_q_vectors = numvecs;

	/* add 1 vector for link status interrupts */
	numvecs++;
	adapter->msix_entries = kcalloc(numvecs, sizeof(struct msix_entry),
					GFP_KERNEL);
	if (!adapter->msix_entries)
		goto msi_only;

	for (i = 0; i < numvecs; i++)
		adapter->msix_entries[i].entry = i;

	err = pci_enable_msix(adapter->pdev,
			      adapter->msix_entries,
			      numvecs);
	if (err == 0)
		goto out;

	igb_reset_interrupt_capability(adapter);

	/* If we can't do MSI-X, try MSI */
msi_only:
#ifdef CONFIG_PCI_IOV
	/* disable SR-IOV for non MSI-X configurations */
	if (adapter->vf_data) {
		struct e1000_hw *hw = &adapter->hw;
		/* disable iov and allow time for transactions to clear */
		pci_disable_sriov(adapter->pdev);
		msleep(500);

		kfree(adapter->vf_data);
		adapter->vf_data = NULL;
		wr32(E1000_IOVCTL, E1000_IOVCTL_REUSE_VFQ);
		msleep(100);
		dev_info(&adapter->pdev->dev, "IOV Disabled\n");
	}
#endif
	adapter->vfs_allocated_count = 0;
	adapter->rss_queues = 1;
	adapter->flags |= IGB_FLAG_QUEUE_PAIRS;
	adapter->num_rx_queues = 1;
	adapter->num_tx_queues = 1;
	adapter->num_q_vectors = 1;
	if (!pci_enable_msi(adapter->pdev))
		adapter->flags |= IGB_FLAG_HAS_MSI;
out:
	/* Notify the stack of the (possibly) reduced Tx Queue count. */
	adapter->netdev->real_num_tx_queues = adapter->num_tx_queues;
}

/**
 * igb_alloc_q_vectors - Allocate memory for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * We allocate one q_vector per queue interrupt.  If allocation fails we
 * return -ENOMEM.
 **/
static int igb_alloc_q_vectors(struct igb_adapter *adapter)
{
	struct igb_q_vector *q_vector;
	struct e1000_hw *hw = &adapter->hw;
	int v_idx;

	for (v_idx = 0; v_idx < adapter->num_q_vectors; v_idx++) {
		q_vector = kzalloc(sizeof(struct igb_q_vector), GFP_KERNEL);
		if (!q_vector)
			goto err_out;
		q_vector->adapter = adapter;
		q_vector->itr_register = hw->hw_addr + E1000_EITR(0);
		q_vector->itr_val = IGB_START_ITR;
		netif_napi_add(adapter->netdev, &q_vector->napi, igb_poll, 64);
		adapter->q_vector[v_idx] = q_vector;
	}
	return 0;

err_out:
	igb_free_q_vectors(adapter);
	return -ENOMEM;
}

static void igb_map_rx_ring_to_vector(struct igb_adapter *adapter,
                                      int ring_idx, int v_idx)
{
	struct igb_q_vector *q_vector = adapter->q_vector[v_idx];

	q_vector->rx_ring = adapter->rx_ring[ring_idx];
	q_vector->rx_ring->q_vector = q_vector;
	q_vector->itr_val = adapter->rx_itr_setting;
	if (q_vector->itr_val && q_vector->itr_val <= 3)
		q_vector->itr_val = IGB_START_ITR;
}

static void igb_map_tx_ring_to_vector(struct igb_adapter *adapter,
                                      int ring_idx, int v_idx)
{
	struct igb_q_vector *q_vector = adapter->q_vector[v_idx];

	q_vector->tx_ring = adapter->tx_ring[ring_idx];
	q_vector->tx_ring->q_vector = q_vector;
	q_vector->itr_val = adapter->tx_itr_setting;
	if (q_vector->itr_val && q_vector->itr_val <= 3)
		q_vector->itr_val = IGB_START_ITR;
}

/**
 * igb_map_ring_to_vector - maps allocated queues to vectors
 *
 * This function maps the recently allocated queues to vectors.
 **/
static int igb_map_ring_to_vector(struct igb_adapter *adapter)
{
	int i;
	int v_idx = 0;

	if ((adapter->num_q_vectors < adapter->num_rx_queues) ||
	    (adapter->num_q_vectors < adapter->num_tx_queues))
		return -ENOMEM;

	if (adapter->num_q_vectors >=
	    (adapter->num_rx_queues + adapter->num_tx_queues)) {
		for (i = 0; i < adapter->num_rx_queues; i++)
			igb_map_rx_ring_to_vector(adapter, i, v_idx++);
		for (i = 0; i < adapter->num_tx_queues; i++)
			igb_map_tx_ring_to_vector(adapter, i, v_idx++);
	} else {
		for (i = 0; i < adapter->num_rx_queues; i++) {
			if (i < adapter->num_tx_queues)
				igb_map_tx_ring_to_vector(adapter, i, v_idx);
			igb_map_rx_ring_to_vector(adapter, i, v_idx++);
		}
		for (; i < adapter->num_tx_queues; i++)
			igb_map_tx_ring_to_vector(adapter, i, v_idx++);
	}
	return 0;
}

/**
 * igb_init_interrupt_scheme - initialize interrupts, allocate queues/vectors
 *
 * This function initializes the interrupts and allocates all of the queues.
 **/
static int igb_init_interrupt_scheme(struct igb_adapter *adapter)
{
	struct pci_dev *pdev = adapter->pdev;
	int err;

	igb_set_interrupt_capability(adapter);

	err = igb_alloc_q_vectors(adapter);
	if (err) {
		dev_err(&pdev->dev, "Unable to allocate memory for vectors\n");
		goto err_alloc_q_vectors;
	}

	err = igb_alloc_queues(adapter);
	if (err) {
		dev_err(&pdev->dev, "Unable to allocate memory for queues\n");
		goto err_alloc_queues;
	}

	err = igb_map_ring_to_vector(adapter);
	if (err) {
		dev_err(&pdev->dev, "Invalid q_vector to ring mapping\n");
		goto err_map_queues;
	}


	return 0;
err_map_queues:
	igb_free_queues(adapter);
err_alloc_queues:
	igb_free_q_vectors(adapter);
err_alloc_q_vectors:
	igb_reset_interrupt_capability(adapter);
	return err;
}

/**
 * igb_request_irq - initialize interrupts
 *
 * Attempts to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static int igb_request_irq(struct igb_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct pci_dev *pdev = adapter->pdev;
	int err = 0;

	if (adapter->msix_entries) {
		err = igb_request_msix(adapter);
		if (!err)
			goto request_done;
		/* fall back to MSI */
		igb_clear_interrupt_scheme(adapter);
		if (!pci_enable_msi(adapter->pdev))
			adapter->flags |= IGB_FLAG_HAS_MSI;
		igb_free_all_tx_resources(adapter);
		igb_free_all_rx_resources(adapter);
		adapter->num_tx_queues = 1;
		adapter->num_rx_queues = 1;
		adapter->num_q_vectors = 1;
		err = igb_alloc_q_vectors(adapter);
		if (err) {
			dev_err(&pdev->dev,
			        "Unable to allocate memory for vectors\n");
			goto request_done;
		}
		err = igb_alloc_queues(adapter);
		if (err) {
			dev_err(&pdev->dev,
			        "Unable to allocate memory for queues\n");
			igb_free_q_vectors(adapter);
			goto request_done;
		}
		igb_setup_all_tx_resources(adapter);
		igb_setup_all_rx_resources(adapter);
	} else {
		igb_assign_vector(adapter->q_vector[0], 0);
	}

	if (adapter->flags & IGB_FLAG_HAS_MSI) {
		err = request_irq(adapter->pdev->irq, igb_intr_msi, 0,
				  netdev->name, adapter);
		if (!err)
			goto request_done;

		/* fall back to legacy interrupts */
		igb_reset_interrupt_capability(adapter);
		adapter->flags &= ~IGB_FLAG_HAS_MSI;
	}

	err = request_irq(adapter->pdev->irq, igb_intr, IRQF_SHARED,
			  netdev->name, adapter);

	if (err)
		dev_err(&adapter->pdev->dev, "Error %d getting interrupt\n",
			err);

request_done:
	return err;
}

static void igb_free_irq(struct igb_adapter *adapter)
{
	if (adapter->msix_entries) {
		int vector = 0, i;

		free_irq(adapter->msix_entries[vector++].vector, adapter);

		for (i = 0; i < adapter->num_q_vectors; i++) {
			struct igb_q_vector *q_vector = adapter->q_vector[i];
			free_irq(adapter->msix_entries[vector++].vector,
			         q_vector);
		}
	} else {
		free_irq(adapter->pdev->irq, adapter);
	}
}

/**
 * igb_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void igb_irq_disable(struct igb_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;

	/*
	 * we need to be careful when disabling interrupts.  The VFs are also
	 * mapped into these registers and so clearing the bits can cause
	 * issues on the VF drivers so we only need to clear what we set
	 */
	if (adapter->msix_entries) {
		u32 regval = rd32(E1000_EIAM);
		wr32(E1000_EIAM, regval & ~adapter->eims_enable_mask);
		wr32(E1000_EIMC, adapter->eims_enable_mask);
		regval = rd32(E1000_EIAC);
		wr32(E1000_EIAC, regval & ~adapter->eims_enable_mask);
	}

	wr32(E1000_IAM, 0);
	wr32(E1000_IMC, ~0);
	wrfl();
	synchronize_irq(adapter->pdev->irq);
}

/**
 * igb_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
static void igb_irq_enable(struct igb_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;

	if (adapter->msix_entries) {
		u32 ims = E1000_IMS_LSC | E1000_IMS_DOUTSYNC;
		u32 regval = rd32(E1000_EIAC);
		wr32(E1000_EIAC, regval | adapter->eims_enable_mask);
		regval = rd32(E1000_EIAM);
		wr32(E1000_EIAM, regval | adapter->eims_enable_mask);
		wr32(E1000_EIMS, adapter->eims_enable_mask);
		if (adapter->vfs_allocated_count) {
			wr32(E1000_MBVFIMR, 0xFF);
			ims |= E1000_IMS_VMMB;
		}
		if (adapter->hw.mac.type == e1000_82580)
			ims |= E1000_IMS_DRSTA;

		wr32(E1000_IMS, ims);
	} else {
		wr32(E1000_IMS, IMS_ENABLE_MASK |
				E1000_IMS_DRSTA);
		wr32(E1000_IAM, IMS_ENABLE_MASK |
				E1000_IMS_DRSTA);
	}
}

static void igb_update_mng_vlan(struct igb_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u16 vid = adapter->hw.mng_cookie.vlan_id;
	u16 old_vid = adapter->mng_vlan_id;

	if (hw->mng_cookie.status & E1000_MNG_DHCP_COOKIE_STATUS_VLAN) {
		/* add VID to filter table */
		igb_vfta_set(hw, vid, true);
		adapter->mng_vlan_id = vid;
	} else {
		adapter->mng_vlan_id = IGB_MNG_VLAN_NONE;
	}

	if ((old_vid != (u16)IGB_MNG_VLAN_NONE) &&
	    (vid != old_vid) &&
	    !vlan_group_get_device(adapter->vlgrp, old_vid)) {
		/* remove VID from filter table */
		igb_vfta_set(hw, old_vid, false);
	}
}

/**
 * igb_release_hw_control - release control of the h/w to f/w
 * @adapter: address of board private structure
 *
 * igb_release_hw_control resets CTRL_EXT:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means that the
 * driver is no longer loaded.
 *
 **/
static void igb_release_hw_control(struct igb_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl_ext;

	/* Let firmware take over control of h/w */
	ctrl_ext = rd32(E1000_CTRL_EXT);
	wr32(E1000_CTRL_EXT,
			ctrl_ext & ~E1000_CTRL_EXT_DRV_LOAD);
}

/**
 * igb_get_hw_control - get control of the h/w from f/w
 * @adapter: address of board private structure
 *
 * igb_get_hw_control sets CTRL_EXT:DRV_LOAD bit.
 * For ASF and Pass Through versions of f/w this means that
 * the driver is loaded.
 *
 **/
static void igb_get_hw_control(struct igb_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	u32 ctrl_ext;

	/* Let firmware know the driver has taken over */
	ctrl_ext = rd32(E1000_CTRL_EXT);
	wr32(E1000_CTRL_EXT,
			ctrl_ext | E1000_CTRL_EXT_DRV_LOAD);
}

/**
 * igb_configure - configure the hardware for RX and TX
 * @adapter: private board structure
 **/
static void igb_configure(struct igb_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	int i;

	igb_get_hw_control(adapter);
	igb_set_rx_mode(netdev);

	igb_restore_vlan(adapter);

	igb_setup_tctl(adapter);
	igb_setup_mrqc(adapter);
	igb_setup_rctl(adapter);

	igb_configure_tx(adapter);
	igb_configure_rx(adapter);

	igb_rx_fifo_flush_82575(&adapter->hw);

	/* call igb_desc_unused which always leaves
	 * at least 1 descriptor unused to make sure
	 * next_to_use != next_to_clean */
	for (i = 0; i < adapter->num_rx_queues; i++) {
		struct igb_ring *ring = adapter->rx_ring[i];
		igb_alloc_rx_buffers_adv(ring, igb_desc_unused(ring));
	}
}

/**
 * igb_power_up_link - Power up the phy/serdes link
 * @adapter: address of board private structure
 **/
void igb_power_up_link(struct igb_adapter *adapter)
{
	if (adapter->hw.phy.media_type == e1000_media_type_copper)
		igb_power_up_phy_copper(&adapter->hw);
	else
		igb_power_up_serdes_link_82575(&adapter->hw);
}

/**
 * igb_power_down_link - Power down the phy/serdes link
 * @adapter: address of board private structure
 */
static void igb_power_down_link(struct igb_adapter *adapter)
{
	if (adapter->hw.phy.media_type == e1000_media_type_copper)
		igb_power_down_phy_copper_82575(&adapter->hw);
	else
		igb_shutdown_serdes_link_82575(&adapter->hw);
}

/**
 * igb_up - Open the interface and prepare it to handle traffic
 * @adapter: board private structure
 **/
int igb_up(struct igb_adapter *adapter)
{
	struct e1000_hw *hw = &adapter->hw;
	int i;

	/* hardware has been reset, we need to reload some things */
	igb_configure(adapter);

	clear_bit(__IGB_DOWN, &adapter->state);

	for (i = 0; i < adapter->num_q_vectors; i++) {
		struct igb_q_vector *q_vector = adapter->q_vector[i];
		napi_enable(&q_vector->napi);
	}
	if (adapter->msix_entries)
		igb_configure_msix(adapter);
	else
		igb_assign_vector(adapter->q_vector[0], 0);

	/* Clear any pending interrupts. */
	rd32(E1000_ICR);
	igb_irq_enable(adapter);

	/* notify VFs that reset has been completed */
	if (adapter->vfs_allocated_count) {
		u32 reg_data = rd32(E1000_CTRL_EXT);
		reg_data |= E1000_CTRL_EXT_PFRSTD;
		wr32(E1000_CTRL_EXT, reg_data);
	}

	netif_tx_start_all_queues(adapter->netdev);

	/* start the watchdog. */
	hw->mac.get_link_status = 1;
	schedule_work(&adapter->watchdog_task);

	return 0;
}

void igb_down(struct igb_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	struct e1000_hw *hw = &adapter->hw;
	u32 tctl, rctl;
	int i;

	/* signal that we're down so the interrupt handler does not
	 * reschedule our watchdog timer */
	set_bit(__IGB_DOWN, &adapter->state);

	/* disable receives in the hardware */
	rctl = rd32(E1000_RCTL);
	wr32(E1000_RCTL, rctl & ~E1000_RCTL_EN);
	/* flush and sleep below */

	netif_tx_stop_all_queues(netdev);

	/* disable transmits in the hardware */
	tctl = rd32(E1000_TCTL);
	tctl &= ~E1000_TCTL_EN;
	wr32(E1000_TCTL, tctl);
	/* flush both disables and wait for them to finish */
	wrfl();
	msleep(10);

	for (i = 0; i < adapter->num_q_vectors; i++) {
		struct igb_q_vector *q_vector = adapter->q_vector[i];
		napi_disable(&q_vector->napi);
	}

	igb_irq_disable(adapter);

	del_timer_sync(&adapter->watchdog_timer);
	del_timer_sync(&adapter->phy_info_timer);

	netif_carrier_off(netdev);

	/* record the stats before reset*/
	igb_update_stats(adapter);

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

	if (!pci_channel_offline(adapter->pdev))
		igb_reset(adapter);
	igb_clean_all_tx_rings(adapter);
	igb_clean_all_rx_rings(adapter);
#ifdef CONFIG_IGB_DCA

	/* since we reset the hardware DCA settings were cleared */
	igb_setup_dca(adapter);
#endif
}

void igb_reinit_locked(struct igb_adapter *adapter)
{
	WARN_ON(in_interrupt());
	while (test_and_set_bit(__IGB_RESETTING, &adapter->state))
		msleep(1);
	igb_down(adapter);
	igb_up(adapter);
	clear_bit(__IGB_RESETTING, &adapter->state);
}

void igb_reset(struct igb_adapter *adapter)
{
	struct pci_dev *pdev = adapter->pdev;
	struct e1000_hw *hw = &adapter->hw;
	struct e1000_mac_info *mac = &hw->mac;
	struct e1000_fc_info *fc = &hw->fc;
	u32 pba = 0, tx_space, min_tx_space, min_rx_space;
	u16 hwm;

	/* Repartition Pba for greater than 9k mtu
	 * To take effect CTRL.RST is required.
	 */
	switch (mac->type) {
	case e1000_i350:
	case e1000_82580:
		pba = rd32(E1000_RXPBS);
		pba = igb_rxpbs_adjust_82580(pba);
		break;
	case e1000_82576:
		pba = rd32(E1000_RXPBS);
		pba &= E1000_RXPBS_SIZE_MASK_82576;
		break;
	case e1000_82575:
	default:
		pba = E1000_PBA_34K;
		break;
	}

	if ((adapter->max_frame_size > ETH_FRAME_LEN + ETH_FCS_LEN) &&
	    (mac->type < e1000_82576)) {
		/* adjust PBA for jumbo frames */
		wr32(E1000_PBA, pba);

		/* To maintain wire speed transmits, the Tx FIFO should be
		 * large enough to accommodate two full transmit packets,
		 * rounded up to the next 1KB and expressed in KB.  Likewise,
		 * the Rx FIFO should be large enough to accommodate at least
		 * one full receive packet and is similarly rounded up and
		 * expressed in KB. */
		pba = rd32(E1000_PBA);
		/* upper 16 bits has Tx packet buffer allocation size in KB */
		tx_space = pba >> 16;
		/* lower 16 bits has Rx packet buffer allocation size in KB */
		pba &= 0xffff;
		/* the tx fifo also stores 16 bytes of information about the tx
		 * but don't include ethernet FCS because hardware appends it */
		min_tx_space = (adapter->max_frame_size +
				sizeof(union e1000_adv_tx_desc) -
				ETH_FCS_LEN) * 2;
		min_tx_space = ALIGN(min_tx_space, 1024);
		min_tx_space >>= 10;
		/* software strips receive CRC, so leave room for it */
		min_rx_space = adapter->max_frame_size;
		min_rx_space = ALIGN(min_rx_space, 1024);
		min_rx_space >>= 10;

		/* If current Tx allocation is less than the min Tx FIFO size,
		 * and the min Tx FIFO size is less than the current Rx FIFO
		 * allocation, take space away from current Rx allocation */
		if (tx_space < min_tx_space &&
		    ((min_tx_space - tx_space) < pba)) {
			pba = pba - (min_tx_space - tx_space);

			/* if short on rx space, rx wins and must trump tx
			 * adjustment */
			if (pba < min_rx_space)
				pba = min_rx_space;
		}
		wr32(E1000_PBA, pba);
	}

	/* flow control settings */
	/* The high water mark must be low enough to fit one full frame
	 * (or the size used for early receive) above it in the Rx FIFO.
	 * Set it to the lower of:
	 * - 90% of the Rx FIFO size, or
	 * - the full Rx FIFO size minus one full frame */
	hwm = min(((pba << 10) * 9 / 10),
			((pba << 10) - 2 * adapter->max_frame_size));

	fc->high_water = hwm & 0xFFF0;	/* 16-byte granularity */
	fc->low_water = fc->high_water - 16;
	fc->pause_time = 0xFFFF;
	fc->send_xon = 1;
	fc->current_mode = fc->requested_mode;

	/* disable receive for all VFs and wait one second */
	if (adapter->vfs_allocated_count) {
		int i;
		for (i = 0 ; i < adapter->vfs_allocated_count; i++)
			adapter->vf_data[i].flags = 0;

		/* ping all the active vfs to let them know we are going down */
		igb_ping_all_vfs(adapter);

		/* disable transmits and receives */
		wr32(E1000_VFRE, 0);
		wr32(E1000_VFTE, 0);
	}

	/* Allow time for pending master requests to run */
	hw->mac.ops.reset_hw(hw);
	wr32(E1000_WUC, 0);

	if (hw->mac.ops.init_hw(hw))
		dev_err(&pdev->dev, "Hardware Error\n");

	if (hw->mac.type == e1000_82580) {
		u32 reg = rd32(E1000_PCIEMISC);
		wr32(E1000_PCIEMISC,
		                reg & ~E1000_PCIEMISC_LX_DECISION);
	}
	if (!netif_running(adapter->netdev))
		igb_power_down_link(adapter);

	igb_update_mng_vlan(adapter);

	/* Enable h/w to recognize an 802.1Q VLAN Ethernet packet */
	wr32(E1000_VET, ETHERNET_IEEE_VLAN_TYPE);

	igb_get_phy_info(hw);
}

static const struct net_device_ops igb_netdev_ops = {
	.ndo_open		= igb_open,
	.ndo_stop		= igb_close,
	.ndo_start_xmit		= igb_xmit_frame_adv,
	.ndo_get_stats		= igb_get_stats,
	.ndo_set_rx_mode	= igb_set_rx_mode,
	.ndo_set_multicast_list	= igb_set_rx_mode,
	.ndo_set_mac_address	= igb_set_mac,
	.ndo_change_mtu		= igb_change_mtu,
	.ndo_do_ioctl		= igb_ioctl,
	.ndo_tx_timeout		= igb_tx_timeout,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_vlan_rx_register	= igb_vlan_rx_register,
	.ndo_vlan_rx_add_vid	= igb_vlan_rx_add_vid,
	.ndo_vlan_rx_kill_vid	= igb_vlan_rx_kill_vid,
	.ndo_set_vf_mac		= igb_ndo_set_vf_mac,
	.ndo_set_vf_vlan	= igb_ndo_set_vf_vlan,
	.ndo_set_vf_tx_rate	= igb_ndo_set_vf_bw,
	.ndo_get_vf_config	= igb_ndo_get_vf_config,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= igb_netpoll,
#endif
};

/**
 * igb_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in igb_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * igb_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 igb_probe(struct pci_dev *pdev,
			       const struct pci_device_id *ent)
{
	struct net_device *netdev;
	struct igb_adapter *adapter;
	struct e1000_hw *hw;
	u16 eeprom_data = 0;
	static int global_quad_port_a; /* global quad port a indication */
	const struct e1000_info *ei = igb_info_tbl[ent->driver_data];
	unsigned long mmio_start, mmio_len;
	int err, pci_using_dac;
	u16 eeprom_apme_mask = IGB_EEPROM_APME;
	u32 part_num;

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

	pci_using_dac = 0;
	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
	if (!err) {
		err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
		if (!err)
			pci_using_dac = 1;
	} else {
		err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
		if (err) {
			err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
			if (err) {
				dev_err(&pdev->dev, "No usable DMA "
					"configuration, aborting\n");
				goto err_dma;
			}
		}
	}

	err = pci_request_selected_regions(pdev, pci_select_bars(pdev,
	                                   IORESOURCE_MEM),
	                                   igb_driver_name);
	if (err)
		goto err_pci_reg;

	pci_enable_pcie_error_reporting(pdev);

	pci_set_master(pdev);
	pci_save_state(pdev);

	err = -ENOMEM;
	netdev = alloc_etherdev_mq(sizeof(struct igb_adapter),
	                           IGB_ABS_MAX_TX_QUEUES);
	if (!netdev)
		goto err_alloc_etherdev;

	SET_NETDEV_DEV(netdev, &pdev->dev);

	pci_set_drvdata(pdev, netdev);
	adapter = netdev_priv(netdev);
	adapter->netdev = netdev;
	adapter->pdev = pdev;
	hw = &adapter->hw;
	hw->back = adapter;
	adapter->msg_enable = NETIF_MSG_DRV | NETIF_MSG_PROBE;

	mmio_start = pci_resource_start(pdev, 0);
	mmio_len = pci_resource_len(pdev, 0);

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

	netdev->netdev_ops = &igb_netdev_ops;
	igb_set_ethtool_ops(netdev);
	netdev->watchdog_timeo = 5 * HZ;

	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);

	netdev->mem_start = mmio_start;
	netdev->mem_end = mmio_start + mmio_len;

	/* PCI config space info */
	hw->vendor_id = pdev->vendor;
	hw->device_id = pdev->device;
	hw->revision_id = pdev->revision;
	hw->subsystem_vendor_id = pdev->subsystem_vendor;
	hw->subsystem_device_id = pdev->subsystem_device;

	/* Copy the default MAC, PHY and NVM function pointers */
	memcpy(&hw->mac.ops, ei->mac_ops, sizeof(hw->mac.ops));
	memcpy(&hw->phy.ops, ei->phy_ops, sizeof(hw->phy.ops));
	memcpy(&hw->nvm.ops, ei->nvm_ops, sizeof(hw->nvm.ops));
	/* Initialize skew-specific constants */
	err = ei->get_invariants(hw);
	if (err)
		goto err_sw_init;

	/* setup the private structure */
	err = igb_sw_init(adapter);
	if (err)
		goto err_sw_init;

	igb_get_bus_info_pcie(hw);

	hw->phy.autoneg_wait_to_complete = false;

	/* Copper options */
	if (hw->phy.media_type == e1000_media_type_copper) {
		hw->phy.mdix = AUTO_ALL_MODES;
		hw->phy.disable_polarity_correction = false;
		hw->phy.ms_type = e1000_ms_hw_default;
	}

	if (igb_check_reset_block(hw))
		dev_info(&pdev->dev,
			"PHY reset is blocked due to SOL/IDER session.\n");

	netdev->features = NETIF_F_SG |
			   NETIF_F_IP_CSUM |
			   NETIF_F_HW_VLAN_TX |
			   NETIF_F_HW_VLAN_RX |
			   NETIF_F_HW_VLAN_FILTER;

	netdev->features |= NETIF_F_IPV6_CSUM;
	netdev->features |= NETIF_F_TSO;
	netdev->features |= NETIF_F_TSO6;
	netdev->features |= NETIF_F_GRO;

	netdev->vlan_features |= NETIF_F_TSO;
	netdev->vlan_features |= NETIF_F_TSO6;
	netdev->vlan_features |= NETIF_F_IP_CSUM;
	netdev->vlan_features |= NETIF_F_IPV6_CSUM;
	netdev->vlan_features |= NETIF_F_SG;

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

	if (hw->mac.type >= e1000_82576)
		netdev->features |= NETIF_F_SCTP_CSUM;

	adapter->en_mng_pt = igb_enable_mng_pass_thru(hw);

	/* before reading the NVM, reset the controller to put the device in a
	 * known good starting state */
	hw->mac.ops.reset_hw(hw);

	/* make sure the NVM is good */
	if (igb_validate_nvm_checksum(hw) < 0) {
		dev_err(&pdev->dev, "The NVM Checksum Is Not Valid\n");
		err = -EIO;
		goto err_eeprom;
	}

	/* copy the MAC address out of the NVM */
	if (hw->mac.ops.read_mac_addr(hw))
		dev_err(&pdev->dev, "NVM Read Error\n");

	memcpy(netdev->dev_addr, hw->mac.addr, netdev->addr_len);
	memcpy(netdev->perm_addr, hw->mac.addr, netdev->addr_len);

	if (!is_valid_ether_addr(netdev->perm_addr)) {
		dev_err(&pdev->dev, "Invalid MAC Address\n");
		err = -EIO;
		goto err_eeprom;
	}

	setup_timer(&adapter->watchdog_timer, &igb_watchdog,
	            (unsigned long) adapter);
	setup_timer(&adapter->phy_info_timer, &igb_update_phy_info,
	            (unsigned long) adapter);

	INIT_WORK(&adapter->reset_task, igb_reset_task);
	INIT_WORK(&adapter->watchdog_task, igb_watchdog_task);

	/* Initialize link properties that are user-changeable */
	adapter->fc_autoneg = true;
	hw->mac.autoneg = true;
	hw->phy.autoneg_advertised = 0x2f;

	hw->fc.requested_mode = e1000_fc_default;
	hw->fc.current_mode = e1000_fc_default;

	igb_validate_mdi_setting(hw);

	/* Initial Wake on LAN setting If APM wake is enabled in the EEPROM,
	 * enable the ACPI Magic Packet filter
	 */

	if (hw->bus.func == 0)
		hw->nvm.ops.read(hw, NVM_INIT_CONTROL3_PORT_A, 1, &eeprom_data);
	else if (hw->mac.type == e1000_82580)
		hw->nvm.ops.read(hw, NVM_INIT_CONTROL3_PORT_A +
		                 NVM_82580_LAN_FUNC_OFFSET(hw->bus.func), 1,
		                 &eeprom_data);
	else if (hw->bus.func == 1)
		hw->nvm.ops.read(hw, NVM_INIT_CONTROL3_PORT_B, 1, &eeprom_data);

	if (eeprom_data & eeprom_apme_mask)
		adapter->eeprom_wol |= E1000_WUFC_MAG;

	/* now that we have the eeprom settings, apply the special cases where
	 * the eeprom may be wrong or the board simply won't support wake on
	 * lan on a particular port */
	switch (pdev->device) {
	case E1000_DEV_ID_82575GB_QUAD_COPPER:
		adapter->eeprom_wol = 0;
		break;
	case E1000_DEV_ID_82575EB_FIBER_SERDES:
	case E1000_DEV_ID_82576_FIBER:
	case E1000_DEV_ID_82576_SERDES:
		/* Wake events only supported on port A for dual fiber
		 * regardless of eeprom setting */
		if (rd32(E1000_STATUS) & E1000_STATUS_FUNC_1)
			adapter->eeprom_wol = 0;
		break;
	case E1000_DEV_ID_82576_QUAD_COPPER:
	case E1000_DEV_ID_82576_QUAD_COPPER_ET2:
		/* if quad port adapter, disable WoL on all but port A */
		if (global_quad_port_a != 0)
			adapter->eeprom_wol = 0;
		else
			adapter->flags |= IGB_FLAG_QUAD_PORT_A;
		/* Reset for multiple quad port adapters */
		if (++global_quad_port_a == 4)
			global_quad_port_a = 0;
		break;
	}

	/* initialize the wol settings based on the eeprom settings */
	adapter->wol = adapter->eeprom_wol;
	device_set_wakeup_enable(&adapter->pdev->dev, adapter->wol);

	/* reset the hardware with the new settings */
	igb_reset(adapter);

	/* let the f/w know that the h/w is now under the control of the
	 * driver. */
	igb_get_hw_control(adapter);

	strcpy(netdev->name, "eth%d");
	err = register_netdev(netdev);
	if (err)
		goto err_register;

	/* carrier off reporting is important to ethtool even BEFORE open */
	netif_carrier_off(netdev);

#ifdef CONFIG_IGB_DCA
	if (dca_add_requester(&pdev->dev) == 0) {
		adapter->flags |= IGB_FLAG_DCA_ENABLED;