/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005, Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef IEEE80211_RATE_H
#define IEEE80211_RATE_H
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/types.h>
#include <linux/kref.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
/**
* struct rate_selection - rate selection for rate control algos
* @rate: selected transmission rate index
* @nonerp: Non-ERP rate to use instead if ERP cannot be used
* @probe: rate for probing (or -1)
*
*/
struct rate_selection {
s8 rate_idx, nonerp_idx, probe_idx;
};
struct rate_control_ops {
struct module *module;
const char *name;
void (*tx_status)(void *priv, struct net_device *dev,
struct sk_buff *skb);
void (*get_rate)(void *priv, struct net_device *dev,
struct ieee80211_supported_band *band,
struct sk_buff *skb,
struct rate_selection *sel);
void (*rate_init)(void *priv, void *priv_sta,
struct ieee80211_local *local, struct sta_info *sta);
void (*clear)(void *priv);
void *(*alloc)(struct ieee80211_local *local);
void (*free)(void *priv);
void *(*alloc_sta)(void *priv, gfp_t gfp);
void (*free_sta)(void *priv, void *priv_sta);
int (*add_attrs)(void *priv, struct kobject *kobj);
void (*remove_attrs)(void *priv, struct kobject *kobj);
void (*add_sta_debugfs)(void *priv, void *priv_sta,
struct dentry *dir);
void (*remove_sta_debugfs)(void *priv, void *priv_sta);
};
struct rate_control_ref {
struct rate_control_ops *ops;
void *priv;
struct kref kref;
};
int ieee80211_rate_control_register(struct rate_control_ops *ops);
void ieee80211_rate_control_unregister(struct rate_control_ops *ops);
/* Get a reference to the rate control algorithm. If `name' is NULL, get the
* first available algorithm. */
struct rate_control_ref *rate_control_alloc(const char *name,
struct ieee80211_local *local);
void rate_control_get_rate(struct net_device *dev,
struct ieee80211_supported_band *sband,
struct sk_buff *skb,
struct rate_selection *sel);
struct rate_control_ref *rate_control_get(struct rate_control_ref *ref);
void rate_control_put(struct rate_control_ref *ref);
static inline void rate_control_tx_status(struct net_device *dev,
struct sk_buff *skb)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct rate_control_ref *ref = local->rate_ctrl;
ref->ops->tx_status(ref->priv, dev, skb);
}
static inline void rate_control_rate_init(struct sta_info *sta,
struct ieee80211_local *local)
{
struct rate_control_ref *ref = sta->rate_ctrl;
ref->ops->rate_init(ref->priv, sta->rate_ctrl_priv, local, sta);
}
static inline void rate_control_clear(struct ieee80211_local *local)
{
struct rate_control_ref *ref = local->rate_ctrl;
ref->ops->clear(ref->priv);
}
static inline void *rate_control_alloc_sta(struct rate_control_ref *ref,
gfp_t gfp)
{
return ref->ops->alloc_sta(ref->priv, gfp);
}
static inline void rate_control_free_sta(struct rate_control_ref *ref,
void *priv)
{
ref->ops->free_sta(ref->priv, priv);
}
static inline void rate_control_add_sta_debugfs(struct sta_info *sta)
{
#ifdef CONFIG_MAC80211_DEBUGFS
struct rate_control_ref *ref = sta->rate_ctrl;
if (sta->debugfs.dir && ref->ops->add_sta_debugfs)
ref->ops->add_sta_debugfs(ref->priv, sta->rate_ctrl_priv,
sta->debugfs.dir);
#endif
}
static inline void rate_control_remove_sta_debugfs(struct sta_info *sta)
{
#ifdef CONFIG_MAC80211_DEBUGFS
struct rate_control_ref *ref = sta->rate_ctrl;
if (ref->ops->remove_sta_debugfs)
ref->ops->remove_sta_debugfs(ref->priv, sta->rate_ctrl_priv);
#endif
}
static inline int rate_supported(struct sta_info *sta,
enum ieee80211_band band,
int index)
{
return (sta == NULL || sta->supp_rates[band] & BIT(index));
}
static inline s8
rate_lowest_index(struct ieee80211_local *local,
struct ieee80211_supported_band *sband,
struct sta_info *sta)
{
int i;
for (i = 0; i < sband->n_bitrates; i++)
if (rate_supported(sta, sband->band, i))
return i;
/* warn when we cannot find a rate. */
WARN_ON(1);
return 0;
}
/* functions for rate control related to a device */
int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
const char *name);
void rate_control_deinitialize(struct ieee80211_local *local);
/* Rate control algorithms */
#ifdef CONFIG_MAC80211_RC_PID
extern int rc80211_pid_init(void);
extern void rc80211_pid_exit(void);
#else
static inline int rc80211_pid_init(void)
{
return 0;
}
static inline void rc80211_pid_exit(void)
{
}
#endif
#endif /* IEEE80211_RATE_H */
