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Some devices implement the entire rate control in firmware in some way, like wl1271 or like iwlwifi which does some things in software but not a lot. Therefore generic software rate control is rather useless for them and just adds avoidable overhead to the transmit path. It's fairly simple to let drivers indicate that they do not need rate control, but they need to fulfil a number of conditions that we encode in WARN_ONs. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef IEEE80211_RATE_H
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#define IEEE80211_RATE_H
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/types.h>
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#include <linux/kref.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "sta_info.h"
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struct rate_control_ref {
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struct ieee80211_local *local;
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struct rate_control_ops *ops;
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void *priv;
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struct kref kref;
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};
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/* Get a reference to the rate control algorithm. If `name' is NULL, get the
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* first available algorithm. */
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struct rate_control_ref *rate_control_alloc(const char *name,
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struct ieee80211_local *local);
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void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta,
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struct ieee80211_tx_rate_control *txrc);
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struct rate_control_ref *rate_control_get(struct rate_control_ref *ref);
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void rate_control_put(struct rate_control_ref *ref);
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static inline void rate_control_tx_status(struct ieee80211_local *local,
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struct ieee80211_supported_band *sband,
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struct sta_info *sta,
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struct sk_buff *skb)
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{
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struct rate_control_ref *ref = local->rate_ctrl;
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struct ieee80211_sta *ista = &sta->sta;
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void *priv_sta = sta->rate_ctrl_priv;
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struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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if (likely(info->flags & IEEE80211_TX_INTFL_RCALGO))
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ref->ops->tx_status(ref->priv, sband, ista, priv_sta, skb);
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}
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static inline void rate_control_rate_init(struct sta_info *sta)
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{
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struct ieee80211_local *local = sta->sdata->local;
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struct rate_control_ref *ref = sta->rate_ctrl;
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struct ieee80211_sta *ista = &sta->sta;
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void *priv_sta = sta->rate_ctrl_priv;
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struct ieee80211_supported_band *sband;
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if (!ref)
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return;
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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ref->ops->rate_init(ref->priv, sband, ista, priv_sta);
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}
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static inline void rate_control_rate_update(struct ieee80211_local *local,
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struct ieee80211_supported_band *sband,
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struct sta_info *sta, u32 changed)
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{
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struct rate_control_ref *ref = local->rate_ctrl;
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struct ieee80211_sta *ista = &sta->sta;
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void *priv_sta = sta->rate_ctrl_priv;
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if (ref && ref->ops->rate_update)
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ref->ops->rate_update(ref->priv, sband, ista,
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priv_sta, changed);
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}
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static inline void *rate_control_alloc_sta(struct rate_control_ref *ref,
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struct ieee80211_sta *sta,
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gfp_t gfp)
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{
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return ref->ops->alloc_sta(ref->priv, sta, gfp);
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}
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static inline void rate_control_free_sta(struct sta_info *sta)
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{
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struct rate_control_ref *ref = sta->rate_ctrl;
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struct ieee80211_sta *ista = &sta->sta;
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void *priv_sta = sta->rate_ctrl_priv;
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ref->ops->free_sta(ref->priv, ista, priv_sta);
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}
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static inline void rate_control_add_sta_debugfs(struct sta_info *sta)
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{
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct rate_control_ref *ref = sta->rate_ctrl;
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if (ref && sta->debugfs.dir && ref->ops->add_sta_debugfs)
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ref->ops->add_sta_debugfs(ref->priv, sta->rate_ctrl_priv,
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sta->debugfs.dir);
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#endif
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}
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static inline void rate_control_remove_sta_debugfs(struct sta_info *sta)
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{
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct rate_control_ref *ref = sta->rate_ctrl;
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if (ref && ref->ops->remove_sta_debugfs)
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ref->ops->remove_sta_debugfs(ref->priv, sta->rate_ctrl_priv);
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#endif
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}
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/* functions for rate control related to a device */
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int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
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const char *name);
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void rate_control_deinitialize(struct ieee80211_local *local);
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/* Rate control algorithms */
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#ifdef CONFIG_MAC80211_RC_PID
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extern int rc80211_pid_init(void);
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extern void rc80211_pid_exit(void);
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#else
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static inline int rc80211_pid_init(void)
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{
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return 0;
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}
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static inline void rc80211_pid_exit(void)
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{
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}
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#endif
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#ifdef CONFIG_MAC80211_RC_MINSTREL
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extern int rc80211_minstrel_init(void);
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extern void rc80211_minstrel_exit(void);
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#else
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static inline int rc80211_minstrel_init(void)
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{
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return 0;
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}
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static inline void rc80211_minstrel_exit(void)
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{
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}
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#endif
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#endif /* IEEE80211_RATE_H */
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