// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2007 - 2018 Intel Corporation. */
#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 void 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_un
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