/*
 * aQuantia Corporation Network Driver
 * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
 *
 * 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.
 */

/* File aq_main.c: Main file for aQuantia Linux driver. */

#include "aq_main.h"
#include "aq_nic.h"
#include "aq_pci_func.h"
#include "aq_ethtool.h"
#include "aq_drvinfo.h"

#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kobject.h>
#include <linux/stat.h>
#include <linux/string.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
#include <uapi/linux/stat.h>
#endif

MODULE_LICENSE("GPL v2");
MODULE_VERSION(AQ_CFG_DRV_VERSION);
MODULE_AUTHOR(AQ_CFG_DRV_AUTHOR);
MODULE_DESCRIPTION(AQ_CFG_DRV_DESC);

static const struct net_device_ops aq_ndev_ops;

struct net_device *aq_ndev_alloc(void)
{
	struct net_device *ndev = NULL;
	struct aq_nic_s *aq_nic = NULL;

	ndev = alloc_etherdev_mq(sizeof(struct aq_nic_s), AQ_CFG_VECS_MAX);
	if (!ndev)
		return NULL;

	aq_nic = netdev_priv(ndev);
	aq_nic->ndev = ndev;
	ndev->netdev_ops = &aq_ndev_ops;
	ndev->ethtool_ops = &aq_ethtool_ops;

	return ndev;
}

static int aq_ndev_open(struct net_device *ndev)
{
	int err = 0;
	struct aq_nic_s *aq_nic = netdev_priv(ndev);

	aq_drvinfo_init(ndev);

	err = aq_nic_init(aq_nic);
	if (err < 0)
		goto err_exit;
	err = aq_nic_start(aq_nic);
	if (err < 0)
		goto err_exit;

err_exit:
	if (err < 0)
		aq_nic_deinit(aq_nic);
	return err;
}

static int aq_ndev_close(struct net_device *ndev)
{
	int err = 0;
	struct aq_nic_s *aq_nic = netdev_priv(ndev);

	aq_drvinfo_exit(ndev);


	err = aq_nic_stop(aq_nic);
	if (err < 0)
		goto err_exit;
	aq_nic_deinit(aq_nic);

err_exit:
	return err;
}

static int aq_ndev_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
	struct aq_nic_s *aq_nic = netdev_priv(ndev);

	return aq_nic_xmit(aq_nic, skb);
}

static int aq_ndev_change_mtu(struct net_device *ndev, int new_mtu)
{
	struct aq_nic_s *aq_nic = netdev_priv(ndev);
	int err = aq_nic_set_mtu(aq_nic, new_mtu + ETH_HLEN);

	if (err < 0)
		goto err_exit;
	ndev->mtu = new_mtu;

err_exit:
	return err;
}

#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
static int aq_ndev_set_features(struct net_device *ndev,
				netdev_features_t features)
{
	struct aq_nic_s *aq_nic = netdev_priv(ndev);
	struct aq_nic_cfg_s *aq_cfg = aq_nic_get_cfg(aq_nic);
	bool is_lro = false;

	if (aq_cfg->hw_features & NETIF_F_LRO) {
		is_lro = features & NETIF_F_LRO;

		if (aq_cfg->is_lro != is_lro) {
			aq_cfg->is_lro = is_lro;

			if (netif_running(ndev)) {
				aq_ndev_close(ndev);
				aq_ndev_open(ndev);
			}
		}
	}

	return 0;
}
#endif

static int aq_ndev_set_mac_address(struct net_device *ndev, void *addr)
{
	struct aq_nic_s *aq_nic = netdev_priv(ndev);
	int err = 0;

	err = eth_mac_addr(ndev, addr);
	if (err < 0)
		goto err_exit;
	err = aq_nic_set_mac(aq_nic, ndev);
	if (err < 0)
		goto err_exit;

err_exit:
	return err;
}

static void aq_ndev_set_multicast_settings(struct net_device *ndev)
{
	struct aq_nic_s *aq_nic = netdev_priv(ndev);
	int err = 0;

	err = aq_nic_set_packet_filter(aq_nic, ndev->flags);
	if (err < 0)
		return;

	err = aq_nic_set_multicast_list(aq_nic, ndev);
	if (err < 0)
		return;
}

static const struct net_device_ops aq_ndev_ops = {
	.ndo_open = aq_ndev_open,
	.ndo_stop = aq_ndev_close,
	.ndo_start_xmit = aq_ndev_start_xmit,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0)
	.ndo_set_multicast_list = aq_ndev_set_multicast_settings,
#else
	.ndo_set_rx_mode = aq_ndev_set_multicast_settings,
#endif
#if (RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(7,5))
	.extended.ndo_change_mtu = aq_ndev_change_mtu,
#else
	.ndo_change_mtu = aq_ndev_change_mtu,
#endif
	.ndo_set_mac_address = aq_ndev_set_mac_address,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)
	.ndo_set_features = aq_ndev_set_features
#endif
};