/* Please avoid adding hacks here - instead add it to mac80211/backports.git */

#include <linux/version.h>	/* LINUX_VERSION_CODE */
#include <linux/types.h>

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0)

#define dev_get_iflink(_net_dev) ((_net_dev)->iflink)

#endif /* < KERNEL_VERSION(4, 1, 0) */

#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 9, 0)

#include <linux/netdevice.h>

#define netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info) ({\
	BUILD_BUG_ON(upper_priv != NULL); \
	BUILD_BUG_ON(upper_info != NULL); \
	netdev_set_master(dev, upper_dev); \
})

#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)

#include <linux/netdevice.h>

#define netdev_master_upper_dev_link(dev, upper_dev, upper_priv, upper_info) ({\
	BUILD_BUG_ON(upper_priv != NULL); \
	BUILD_BUG_ON(upper_info != NULL); \
	netdev_master_upper_dev_link(dev, upper_dev); \
})

#endif /* < KERNEL_VERSION(4, 5, 0) */


#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)

#define IFF_NO_QUEUE	0; dev->tx_queue_len = 0

/* Exponentially weighted moving average (EWMA) */

#define DECLARE_EWMA(name, _factor, _weight)				\
	struct ewma_##name {						\
		unsigned long internal;					\
	};								\
	static inline void ewma_##name##_init(struct ewma_##name *e)	\
	{								\
		BUILD_BUG_ON(!__builtin_constant_p(_factor));		\
		BUILD_BUG_ON(!__builtin_constant_p(_weight));		\
		BUILD_BUG_ON_NOT_POWER_OF_2(_factor);			\
		BUILD_BUG_ON_NOT_POWER_OF_2(_weight);			\
		e->internal = 0;					\
	}								\
	static inline unsigned long					\
	ewma_##name##_read(struct ewma_##name *e)			\
	{								\
		BUILD_BUG_ON(!__builtin_constant_p(_factor));		\
		BUILD_BUG_ON(!__builtin_constant_p(_weight));		\
		BUILD_BUG_ON_NOT_POWER_OF_2(_factor);			\
		BUILD_BUG_ON_NOT_POWER_OF_2(_weight);			\
		return e->internal >> ilog2(_factor);			\
	}								\
	static inline void ewma_##name##_add(struct ewma_##name *e,	\
					     unsigned long val)		\
	{								\
		unsigned long internal = ACCESS_ONCE(e->internal);	\
		unsigned long weight = ilog2(_weight);			\
		unsigned long factor = ilog2(_factor);			\
									\
		BUILD_BUG_ON(!__builtin_constant_p(_factor));		\
		BUILD_BUG_ON(!__builtin_constant_p(_weight));		\
		BUILD_BUG_ON_NOT_POWER_OF_2(_factor);			\
		BUILD_BUG_ON_NOT_POWER_OF_2(_weight);			\
									\
		ACCESS_ONCE(e->internal) = internal ?			\
			(((internal << weight) - internal) +		\
				(val << factor)) >> weight :		\
			(val << factor);				\
	}

#endif /* < KERNEL_VERSION(4, 3, 0) */

#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0)

#include <linux/ethtool.h>

#define ethtool_link_ksettings batadv_ethtool_link_ksettings

struct batadv_ethtool_link_ksettings {
	struct {
		__u32	speed;
		__u8	duplex;
	} base;
};

#define __ethtool_get_link_ksettings(__dev, __link_settings) \
	batadv_ethtool_get_link_ksettings(__dev, __link_settings)

static inline int
batadv_ethtool_get_link_ksettings(struct net_device *dev,
				  struct ethtool_link_ksettings *link_ksettings)
{
	struct ethtool_cmd cmd;
	int ret;

	memset(&cmd, 0, sizeof(cmd));
	ret = __ethtool_get_settings(dev, &cmd);

	if (ret != 0)
		return ret;

	link_ksettings->base.duplex = cmd.duplex;
	link_ksettings->base.speed = ethtool_cmd_speed(&cmd);

	return 0;
}

#endif /* < KERNEL_VERSION(4, 6, 0) */