cregit-Linux how code gets into the kernel

Release 4.11 net/mac80211/rate.c

Directory: net/mac80211
/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, 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.
 */

#include <linux/kernel.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "rate.h"
#include "ieee80211_i.h"
#include "debugfs.h"


struct rate_control_alg {
	
struct list_head list;
	
const struct rate_control_ops *ops;
};

static LIST_HEAD(rate_ctrl_algs);
static DEFINE_MUTEX(rate_ctrl_mutex);


static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
module_param(ieee80211_default_rc_algo, charp, 0644);
MODULE_PARM_DESC(ieee80211_default_rc_algo,
		 "Default rate control algorithm for mac80211 to use");




void rate_control_rate_init(struct sta_info *sta)
{
	struct ieee80211_local *local = sta->sdata->local;
	struct rate_control_ref *ref = sta->rate_ctrl;
	struct ieee80211_sta *ista = &sta->sta;
	void *priv_sta = sta->rate_ctrl_priv;
	struct ieee80211_supported_band *sband;
	struct ieee80211_chanctx_conf *chanctx_conf;

	ieee80211_sta_set_rx_nss(sta);

	if (!ref)
		return;

	rcu_read_lock();

	chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}

	sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];

	spin_lock_bh(&sta->rate_ctrl_lock);
	ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista,
			    priv_sta);
	spin_unlock_bh(&sta->rate_ctrl_lock);
	rcu_read_unlock();
	set_sta_flag(sta, WLAN_STA_RATE_CONTROL);
}


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void rate_control_rate_update(struct ieee80211_local *local,
				    struct ieee80211_supported_band *sband,
				    struct sta_info *sta, u32 changed)
{
	struct rate_control_ref *ref = local->rate_ctrl;
	struct ieee80211_sta *ista = &sta->sta;
	void *priv_sta = sta->rate_ctrl_priv;
	struct ieee80211_chanctx_conf *chanctx_conf;

	if (ref && ref->ops->rate_update) {
		rcu_read_lock();

		chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
		if (WARN_ON(!chanctx_conf)) {
			rcu_read_unlock();
			return;
		}

		spin_lock_bh(&sta->rate_ctrl_lock);
		ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def,
				      ista, priv_sta, changed);
		spin_unlock_bh(&sta->rate_ctrl_lock);
		rcu_read_unlock();
	}
	drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
}


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int ieee80211_rate_control_register(const struct rate_control_ops *ops)
{
	struct rate_control_alg *alg;

	if (!ops->name)
		return -EINVAL;

	mutex_lock(&rate_ctrl_mutex);
	list_for_each_entry(alg, &rate_ctrl_algs, list) {
		if (!strcmp(alg->ops->name, ops->name)) {
			/* don't register an algorithm twice */
			WARN_ON(1);
			mutex_unlock(&rate_ctrl_mutex);
			return -EALREADY;
		}
	}

	alg = kzalloc(sizeof(*alg), GFP_KERNEL);
	if (alg == NULL) {
		mutex_unlock(&rate_ctrl_mutex);
		return -ENOMEM;
	}
	alg->ops = ops;

	list_add_tail(&alg->list, &rate_ctrl_algs);
	mutex_unlock(&rate_ctrl_mutex);

	return 0;
}

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Johannes Berg6246.27%350.00%


Cyrill V. Gorcunov64.48%116.67%


Yoann Padioleau10.75%116.67%


Total134100.00%6100.00%




EXPORT_SYMBOL(ieee80211_rate_control_register);




void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
{
	struct rate_control_alg *alg;

	mutex_lock(&rate_ctrl_mutex);
	list_for_each_entry(alg, &rate_ctrl_algs, list) {
		if (alg->ops == ops) {
			list_del(&alg->list);
			kfree(alg);
			break;
		}
	}
	mutex_unlock(&rate_ctrl_mutex);
}

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Cyrill V. Gorcunov58.06%133.33%


Johannes Berg11.61%133.33%


Total62100.00%3100.00%




EXPORT_SYMBOL(ieee80211_rate_control_unregister);



static const struct rate_control_ops *

ieee80211_try_rate_control_ops_get(const char *name)
{
	struct rate_control_alg *alg;
	const struct rate_control_ops *ops = NULL;

	if (!name)
		return NULL;

	mutex_lock(&rate_ctrl_mutex);
	list_for_each_entry(alg, &rate_ctrl_algs, list) {
		if (!strcmp(alg->ops->name, name)) {
			ops = alg->ops;
			break;
		}
	}
	mutex_unlock(&rate_ctrl_mutex);
	return ops;
}


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Johannes Berg1012.05%266.67%


Total83100.00%3100.00%



/* Get the rate control algorithm. */


static const struct rate_control_ops *

ieee80211_rate_control_ops_get(const char *name)
{
	const struct rate_control_ops *ops;
	const char *alg_name;

	kernel_param_lock(THIS_MODULE);
	if (!name)
		alg_name = ieee80211_default_rc_algo;
	else
		alg_name = name;

	ops = ieee80211_try_rate_control_ops_get(alg_name);
	if (!ops && name)
		/* try default if specific alg requested but not found */
		ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);

	/* try built-in one if specific alg requested but not found */
	if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT))
		ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
	kernel_param_unlock(THIS_MODULE);

	return ops;
}


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Johannes Berg2729.35%342.86%


Stefano Brivio2426.09%114.29%


Rusty Russell66.52%114.29%


Dan Streetman44.35%114.29%


Total92100.00%7100.00%



#ifdef CONFIG_MAC80211_DEBUGFS



static ssize_t rcname_read(struct file *file, char __user *userbuf,
			   size_t count, loff_t *ppos)
{
	struct rate_control_ref *ref = file->private_data;
	int len = strlen(ref->ops->name);

	return simple_read_from_buffer(userbuf, count, ppos,
				       ref->ops->name, len);
}


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static const struct file_operations rcname_ops = {
	.read = rcname_read,
	.open = simple_open,
	.llseek = default_llseek,
};
#endif




static struct rate_control_ref *rate_control_alloc(const char *name,
					    struct ieee80211_local *local)
{
	struct dentry *debugfsdir = NULL;
	struct rate_control_ref *ref;

	ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
	if (!ref)
		return NULL;
	ref->local = local;
	ref->ops = ieee80211_rate_control_ops_get(name);
	if (!ref->ops)
		goto free;

#ifdef CONFIG_MAC80211_DEBUGFS
	debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
	local->debugfs.rcdir = debugfsdir;
	debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
#endif

	ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
	if (!ref->priv)
		goto free;
	return ref;

free:
	kfree(ref);
	return NULL;
}


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Johannes Berg6641.51%250.00%


Andres Salomon10.63%125.00%


Total159100.00%4100.00%






static void rate_control_free(struct rate_control_ref *ctrl_ref)
{
	ctrl_ref->ops->free(ctrl_ref->priv);

#ifdef CONFIG_MAC80211_DEBUGFS
	debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir);
	ctrl_ref->local->debugfs.rcdir = NULL;
#endif

	kfree(ctrl_ref);
}


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static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
{
	struct sk_buff *skb = txrc->skb;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	__le16 fc;

	fc = hdr->frame_control;

	return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
			       IEEE80211_TX_CTL_USE_MINRATE)) ||
		!ieee80211_is_data(fc);
}


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static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
				  struct ieee80211_supported_band *sband)
{
	u8 i;

	if (basic_rates == 0)
		return; /* assume basic rates unknown and accept rate */
	if (*idx < 0)
		return;
	if (basic_rates & (1 << *idx))
		return; /* selected rate is a basic rate */

	for (i = *idx + 1; i <= sband->n_bitrates; i++) {
		if (basic_rates & (1 << i)) {
			*idx = i;
			return;
		}
	}

	/* could not find a basic rate; use original selection */
}


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static void __rate_control_send_low(struct ieee80211_hw *hw,
				    struct ieee80211_supported_band *sband,
				    struct ieee80211_sta *sta,
				    struct ieee80211_tx_info *info,
				    u32 rate_mask)
{
	int i;
	u32 rate_flags =
		ieee80211_chandef_rate_flags(&hw->conf.chandef);

	if ((sband->band == NL80211_BAND_2GHZ) &&
	    (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
		rate_flags |= IEEE80211_RATE_ERP_G;

	info->control.rates[0].idx = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (!(rate_mask & BIT(i)))
			continue;

		if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
			continue;

		if (!rate_supported(sta, sband->band, i))
			continue;

		info->control.rates[0].idx = i;
		break;
	}
	WARN_ONCE(i == sband->n_bitrates,
		  "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n",
		  sta ? sta->supp_rates[sband->band] : -1,
		  rate_mask, rate_flags);

	info->control.rates[0].count =
		(info->flags & IEEE80211_TX_CTL_NO_ACK) ?
		1 : hw->max_rate_tries;

	info->control.skip_table = 1;
}



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Johannes Berg2210.05%333.33%


Felix Fietkau219.59%111.11%


Total219100.00%9100.00%






bool rate_control_send_low(struct ieee80211_sta *pubsta,
			   void *priv_sta,
			   struct ieee80211_tx_rate_control *txrc)
{
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
	struct ieee80211_supported_band *sband = txrc->sband;
	struct sta_info *sta;
	int mcast_rate;
	bool use_basicrate = false;

	if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
		__rate_control_send_low(txrc->hw, sband, pubsta, info,
					txrc->rate_idx_mask);

		if (!pubsta && txrc->bss) {
			mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
			if (mcast_rate > 0) {
				info->control.rates[0].idx = mcast_rate - 1;
				return true;
			}
			use_basicrate = true;
		} else if (pubsta) {
			sta = container_of(pubsta, struct sta_info, sta);
			if (ieee80211_vif_is_mesh(&sta->sdata->vif))
				use_basicrate = true;
		}

		if (use_basicrate)
			rc_send_low_basicrate(&info->control.rates[0].idx,
					      txrc->bss_conf->basic_rates,
					      sband);

		return true;
	}
	return false;
}

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Luis R. Rodriguez83.86%114.29%


Andrei Otcheretianski41.93%114.29%


Total207100.00%7100.00%




EXPORT_SYMBOL(rate_control_send_low);




static bool rate_idx_match_legacy_mask(s8 *rate_idx, int n_bitrates, u32 mask)
{
	int j;

	/* See whether the selected rate or anything below it is allowed. */
	for (j = *rate_idx; j >= 0; j--) {
		if (mask & (1 << j)) {
			/* Okay, found a suitable rate. Use it. */
			*rate_idx = j;
			return true;
		}
	}

	/* Try to find a higher rate that would be allowed */
	for (j = *rate_idx + 1; j < n_bitrates; j++) {
		if (mask & (1 << j)) {
			/* Okay, found a suitable rate. Use it. */
			*rate_idx = j;
			return true;
		}
	}
	return false;
}


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static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
{
	int i, j;
	int ridx, rbit;

	ridx = *rate_idx / 8;
	rbit = *rate_idx % 8;

	/* sanity check */
	if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
		return false;

	/* See whether the selected rate or anything below it is allowed. */
	for (i = ridx; i >= 0; i--) {
		for (j = rbit; j >= 0; j--)
			if (mcs_mask[i] & BIT(j)) {
				*rate_idx = i * 8 + j;
				return true;
			}
		rbit = 7;
	}

	/* Try to find a higher rate that would be allowed */
	ridx = (*rate_idx + 1) / 8;
	rbit = (*rate_idx + 1) % 8;

	for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
		for (j = rbit; j < 8; j++)
			if (mcs_mask[i] & BIT(j)) {
				*rate_idx = i * 8 + j;
				return true;
			}
		rbit = 0;
	}
	return false;
}


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Dan Carpenter10.51%133.33%


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static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
{
	int i, j;
	int ridx, rbit;

	ridx = *rate_idx >> 4;
	rbit = *rate_idx & 0xf;

	if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
		return false;

	/* See whether the selected rate or anything below it is allowed. */
	for (i = ridx; i >= 0; i--) {
		for (j = rbit; j >= 0; j--) {
			if (vht_mask[i] & BIT(j)) {
				*rate_idx = (i << 4) | j;
				return true;
			}
		}
		rbit = 15;
	}

	/* Try to find a higher rate that would be allowed */
	ridx = (*rate_idx + 1) >> 4;
	rbit = (*rate_idx + 1) & 0xf;

	for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) {
		for (j = rbit; j < 16; j++) {
			if (vht_mask[i] & BIT(j)) {
				*rate_idx = (i << 4) | j;
				return true;
			}
		}
		rbit = 0;
	}
	return false;
}


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static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
				struct ieee80211_supported_band *sband,
				enum nl80211_chan_width chan_width,
				u32 mask,
				u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
				u16 vht_mask[NL80211_VHT_NSS_MAX])
{
	if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) {
		/* handle VHT rates */
		if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask))
			return;

		*rate_idx = 0;
		/* keep protection flags */
		*rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
				IEEE80211_TX_RC_USE_CTS_PROTECT |
				IEEE80211_TX_RC_USE_SHORT_PREAMBLE);

		*rate_flags |= IEEE80211_TX_RC_MCS;
		if (chan_width == NL80211_CHAN_WIDTH_40)
			*rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;

		if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
			return;

		/* also try the legacy rates. */
		*rate_flags &= ~(IEEE80211_TX_RC_MCS |
				 IEEE80211_TX_RC_40_MHZ_WIDTH);
		if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
					       mask))
			return;
	} else if (*rate_flags & IEEE80211_TX_RC_MCS) {
		/* handle HT rates */
		if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
			return;

		/* also try the legacy rates. */
		*rate_idx = 0;
		/* keep protection flags */
		*rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
				IEEE80211_TX_RC_USE_CTS_PROTECT |
				IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
		if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
					       mask))
			return;
	} else {
		/* handle legacy rates */
		if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
					       mask))
			return;

		/* if HT BSS, and we handle a data frame, also try HT rates */
		switch (chan_width) {
		case NL80211_CHAN_WIDTH_20_NOHT:
		case NL80211_CHAN_WIDTH_5:
		case NL80211_CHAN_WIDTH_10:
			return;
		default:
			break;
		}

		*rate_idx = 0;
		/* keep protection flags */
		*rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
				IEEE80211_TX_RC_USE_CTS_PROTECT |
				IEEE80211_TX_RC_USE_SHORT_PREAMBLE);

		*rate_flags |= IEEE80211_TX_RC_MCS;

		if (chan_width == NL80211_CHAN_WIDTH_40)
			*rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;

		if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
			return;
	}

	/*
         * Uh.. No suitable rate exists. This should not really happen with
         * sane TX rate mask configurations. However, should someone manage to
         * configure supported rates and TX rate mask in incompatible way,
         * allow the frame to be transmitted with whatever the rate control
         * selected.
         */
}


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Johannes Berg10.38%112.50%


Total260100.00%8100.00%






static void rate_fixup_ratelist(struct ieee80211_vif *vif,
				struct ieee80211_supported_band *sband,
				struct ieee80211_tx_info *info,
				struct ieee80211_tx_rate *rates,
				int max_rates)
{
	struct ieee80211_rate *rate;
	bool inval = false;
	int i;

	/*
         * Set up the RTS/CTS rate as the fastest basic rate
         * that is not faster than the data rate unless there
         * is no basic rate slower than the data rate, in which
         * case we pick the slowest basic rate
         *
         * XXX: Should this check all retry rates?
         */
	if (!(rates[0].flags &
	      (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
		u32 basic_rates = vif->bss_conf.basic_rates;
		s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;

		rate = &sband->bitrates[rates[0].idx];

		for (i = 0; i < sband->n_bitrates; i++) {
			/* must be a basic rate */
			if (!(basic_rates & BIT(i)))
				continue;
			/* must not be faster than the data rate */
			if (sband->bitrates[i].bitrate > rate->bitrate)
				continue;
			/* maximum */
			if (sband->bitrates[baserate].bitrate <
			     sband->bitrates[i].bitrate)
				baserate = i;
		}

		info->control.rts_cts_rate_idx = baserate;
	}

	for (i = 0; i < max_rates; i++) {
		/*
                 * make sure there's no valid rate following
                 * an invalid one, just in case drivers don't
                 * take the API seriously to stop at -1.
                 */
		if (inval) {
			rates[i].idx = -1;
			continue;
		}
		if (rates[i].idx < 0) {
			inval = true;
			continue;
		}

		/*
                 * For now assume MCS is already set up correctly, this
                 * needs to be fixed.
                 */
		if (rates[i].flags & IEEE80211_TX_RC_MCS) {
			WARN_ON(rates[i].idx > 76);

			if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
			    info->control.use_cts_prot)
				rates[i].flags |=
					IEEE80211_TX_RC_USE_CTS_PROTECT;
			continue;
		}

		if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
			WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
			continue;
		}

		/* set up RTS protection if desired */
		if (info->control.use_rts) {
			rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS;
			info->control.use_cts_prot = false;
		}

		/* RC is busted */
		if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
			rates[i].idx = -1;
			continue;
		}

		rate = &sband->bitrates[rates[i].idx];

		/* set up short preamble */
		if (info->control.short_preamble &&
		    rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
			rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;

		/* set up G protection */
		if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
		    info->control.use_cts_prot &&
		    rate->flags & IEEE80211_RATE_ERP_G)
			rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
	}
}



Contributors
PersonTokensPropCommitsCommitProp
Felix Fietkau43195.78%233.33%


Mattias Nissler143.11%116.67%


Johannes Berg40.89%233.33%


Karl Beldan10.22%116.67%


Total450100.00%6100.00%






static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
					struct ieee80211_tx_info *info,
					struct ieee80211_tx_rate *rates,
					int max_rates)
{
	struct ieee80211_sta_rates *ratetbl = NULL;
	int i;

	if (sta && !info->control.skip_table)
		ratetbl = rcu_dereference(sta->rates);

	/* Fill remaining rate slots with data from the sta rate table. */
	max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
	for (i = 0; i < max_rates; i++) {
		if (i < ARRAY_SIZE(info->control.rates) &&
		    info->control.rates[i].idx >= 0 &&
		    info->control.rates[i].count) {
			if (rates != info