path: root/drivers/net/ethernet/intel/igb/e1000_mac.c

/* Intel(R) Gigabit Ethernet Linux driver
 * Copyright(c) 2007-2014 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, see <http://www.gnu.org/licenses/>.
 *
 * 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/if_ether.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>

#include "e1000_mac.h"

#include "igb.h"

static s32 igb_set_default_fc(struct e1000_hw *hw);
static s32 igb_set_fc_watermarks(struct e1000_hw *hw);

/**
 *  igb_get_bus_info_pcie - Get PCIe bus information
 *  @hw: pointer to the HW structure
 *
 *  Determines and stores the system bus information for a particular
 *  network interface.  The following bus information is determined and stored:
 *  bus speed, bus width, type (PCIe), and PCIe function.
 **/
s32 igb_get_bus_info_pcie(struct e1000_hw *hw)
{
	struct e1000_bus_info *bus = &hw->bus;
	s32 ret_val;
	u32 reg;
	u16 pcie_link_status;

	bus->type = e1000_bus_type_pci_express;

	ret_val = igb_read_pcie_cap_reg(hw,
					PCI_EXP_LNKSTA,
					&pcie_link_status);
	if (ret_val) {
		bus->width = e1000_bus_width_unknown;
		bus->speed = e1000_bus_speed_unknown;
	} else {
		switch (pcie_link_status & PCI_EXP_LNKSTA_CLS) {
		case PCI_EXP_LNKSTA_CLS_2_5GB:
			bus->speed = e1000_bus_speed_2500;
			break;
		case PCI_EXP_LNKSTA_CLS_5_0GB:
			bus->speed = e1000_bus_speed_5000;
			break;
		default:
			bus->speed = e1000_bus_speed_unknown;
			break;
		}

		bus->width = (enum e1000_bus_width)((pcie_link_status &
						     PCI_EXP_LNKSTA_NLW) >>
						     PCI_EXP_LNKSTA_NLW_SHIFT);
	}

	reg = rd32(E1000_STATUS);
	bus->func = (reg & E1000_STATUS_FUNC_MASK) >> E1000_STATUS_FUNC_SHIFT;

	return 0;
}

/**
 *  igb_clear_vfta - Clear VLAN filter table
 *  @hw: pointer to the HW structure
 *
 *  Clears the register array which contains the VLAN filter table by
 *  setting all the values to 0.
 **/
void igb_clear_vfta(struct e1000_hw *hw)
{
	u32 offset;

	for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) {
		array_wr32(E1000_VFTA, offset, 0);
		wrfl();
	}
}

/**
 *  igb_write_vfta - Write value to VLAN filter table
 *  @hw: pointer to the HW structure
 *  @offset: register offset in VLAN filter table
 *  @value: register value written to VLAN filter table
 *
 *  Writes value at the given offset in the register array which stores
 *  the VLAN filter table.
 **/
static void igb_write_vfta(struct e1000_hw *hw, u32 offset, u32 value)
{
	array_wr32(E1000_VFTA, offset, value);
	wrfl();
}

/* Due to a hw errata, if the host tries to  configure the VFTA register
 * while performing queries from the BMC or DMA, then the VFTA in some
 * cases won't be written.
 */

/**
 *  igb_clear_vfta_i350 - Clear VLAN filter table
 *  @hw: pointer to the HW structure
 *
 *  Clears the register array which contains the VLAN filter table by
 *  setting all the values to 0.
 **/
void igb_clear_vfta_i350(struct e1000_hw *hw)
{
	u32 offset;
	int i;

	for (offset = 0; offset < E1000_VLAN_FILTER_TBL_SIZE; offset++) {
		for (i = 0; i < 10; i++)
			array_wr32(E1000_VFTA, offset, 0);

		wrfl();
	}
}

/**
 *  igb_write_vfta_i350 - Write value to VLAN filter table
 *  @hw: pointer to the HW structure
 *  @offset: register offset in VLAN filter table
 *  @value: register value written to VLAN filter table
 *
 *  Writes value at the given offset in the register array which stores
 *  the VLAN filter table.
 **/
static void ig