[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / net / mac80211 / rc80211_simple.c

/*
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 *
 * 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/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/compiler.h>
#include <linux/module.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "debugfs.h"


/* This is a minimal implementation of TX rate controlling that can be used
 * as the default when no improved mechanisms are available. */

#define RATE_CONTROL_NUM_DOWN 20
#define RATE_CONTROL_NUM_UP   15

#define RATE_CONTROL_EMERG_DEC 2
#define RATE_CONTROL_INTERVAL (HZ / 20)
#define RATE_CONTROL_MIN_TX 10

static void rate_control_rate_inc(struct ieee80211_local *local,
				  struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_supported_band *sband;
	int i = sta->txrate_idx;
	int maxrate;

	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
		/* forced unicast rate - do not change STA rate */
		return;
	}

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;

	if (i > sband->n_bitrates)
		i = sband->n_bitrates - 2;

	while (i + 1 < sband->n_bitrates) {
		i++;
		if (rate_supported(sta, sband->band, i) &&
		    (maxrate < 0 || i <= maxrate)) {
			sta->txrate_idx = i;
			break;
		}
	}
}


static void rate_control_rate_dec(struct ieee80211_local *local,
				  struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_supported_band *sband;
	int i = sta->txrate_idx;

	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
		/* forced unicast rate - do not change STA rate */
		return;
	}

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	if (i > sband->n_bitrates)
		i = sband->n_bitrates;

	while (i > 0) {
		i--;
		if (rate_supported(sta, sband->band, i)) {
			sta->txrate_idx = i;
			break;
		}
	}
}

struct global_rate_control {
	int dummy;
};

struct sta_rate_control {
	unsigned long last_rate_change;
	u32 tx_num_failures;
	u32 tx_num_xmit;

	unsigned long avg_rate_update;
	u32 tx_avg_rate_sum;
	u32 tx_avg_rate_num;

#ifdef CONFIG_MAC80211_DEBUGFS
	struct dentry *tx_avg_rate_sum_dentry;
	struct dentry *tx_avg_rate_num_dentry;
#endif
};


static void rate_control_simple_tx_status(void *priv, struct net_device *dev,
					  struct sk_buff *skb,
					  struct ieee80211_tx_status *status)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct sta_info *sta;
	struct sta_rate_control *srctrl;

	sta = sta_info_get(local, hdr->addr1);

	if (!sta)
	    return;

	srctrl = sta->rate_ctrl_priv;
	srctrl->tx_num_xmit++;
	if (status->excessive_retries) {
		srctrl->tx_num_failures++;
		sta->tx_retry_failed++;
		sta->tx_num_consecutive_failures++;
		sta->tx_num_mpdu_fail++;
	} else {
		sta->last_ack_rssi[0] = sta->last_ack_rssi[1];
		sta->last_ack_rssi[1] = sta->last_ack_rssi[2];
		sta->last_ack_rssi[2] = status->ack_signal;
		sta->tx_num_consecutive_failures = 0;
		sta->tx_num_mpdu_ok++;
	}
	sta->tx_retry_count += status->retry_count;
	sta->tx_num_mpdu_fail += status->retry_count;

	if (time_after(jiffies,
		       srctrl->last_rate_change + RATE_CONTROL_INTERVAL) &&
		srctrl->tx_num_xmit > RATE_CONTROL_MIN_TX) {
		u32 per_failed;
		srctrl->last_rate_change = jiffies;

		per_failed = (100 * sta->tx_num_mpdu_fail) /
			(sta->tx_num_mpdu_fail + sta->tx_num_mpdu_ok);
		/* TODO: calculate average per_failed to make adjusting
		 * parameters easier */
#if 0
		if (net_ratelimit()) {
			printk(KERN_DEBUG "MPDU fail=%d ok=%d per_failed=%d\n",
			       sta->tx_num_mpdu_fail, sta->tx_num_mpdu_ok,
			       per_failed);
		}
#endif

		/*
		 * XXX: Make these configurable once we have an
		 * interface to the rate control algorithms
		 */
		if (per_failed > RATE_CONTROL_NUM_DOWN) {
			rate_control_rate_dec(local, sta);
		} else if (per_failed < RATE_CONTROL_NUM_UP) {
			rate_control_rate_inc(local, sta);
		}
		srctrl->tx_avg_rate_sum += status->control.tx_rate->bitrate;
		srctrl->tx_avg_rate_num++;
		srctrl->tx_num_failures = 0;
		srctrl->tx_num_xmit = 0;
	} else if (sta->tx_num_consecutive_failures >=
		   RATE_CONTROL_EMERG_DEC) {
		rate_control_rate_dec(local, sta);
	}

	if (srctrl->avg_rate_update + 60 * HZ < jiffies) {
		srctrl->avg_rate_update = jiffies;
		if (srctrl->tx_avg_rate_num > 0) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
			DECLARE_MAC_BUF(mac);
			printk(KERN_DEBUG "%s: STA %s Average rate: "
			       "%d (%d/%d)\n",
			       dev->name, print_mac(mac, sta->addr),
			       srctrl->tx_avg_rate_sum /
			       srctrl->tx_avg_rate_num,
			       srctrl->tx_avg_rate_sum,
			       srctrl->tx_avg_rate_num);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
			srctrl->tx_avg_rate_sum = 0;
			srctrl->tx_avg_rate_num = 0;
		}
	}

	sta_info_put(sta);
}


static void
rate_control_simple_get_rate(void *priv, struct net_device *dev,
			     struct ieee80211_supported_band *sband,
			     struct sk_buff *skb,
			     struct rate_selection *sel)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_sub_if_data *sdata;
	struct sta_info *sta;
	int rateidx;
	u16 fc;

	sta = sta_info_get(local, hdr->addr1);

	/* Send management frames and broadcast/multicast data using lowest
	 * rate. */
	fc = le16_to_cpu(hdr->frame_control);
	if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
	    is_multicast_ether_addr(hdr->addr1) || !sta) {
		sel->rate = rate_lowest(local, sband, sta);
		if (sta)
			sta_info_put(sta);
		return;
	}

	/* If a forced rate is in effect, select it. */
	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
		sta->txrate_idx = sdata->bss->force_unicast_rateidx;

	rateidx = sta->txrate_idx;

	if (rateidx >= sband->n_bitrates)
		rateidx = sband->n_bitrates - 1;

	sta->last_txrate_idx = rateidx;

	sta_info_put(sta);

	sel->rate = &sband->bitrates[rateidx];
}


static void rate_control_simple_rate_init(void *priv, void *priv_sta,
					  struct ieee80211_local *local,
					  struct sta_info *sta)
{
	struct ieee80211_supported_band *sband;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	/* TODO: This routine should consider using RSSI from previous packets
	 * as we need to have IEEE 802.1X auth succeed immediately after assoc..
	 * Until that method is implemented, we will use the lowest supported rate
	 * as a workaround, */
	sta->txrate_idx = rate_lowest_index(local, sband, sta);
}


static void * rate_control_simple_alloc(struct ieee80211_local *local)
{
	struct global_rate_control *rctrl;

	rctrl = kzalloc(sizeof(*rctrl), GFP_ATOMIC);

	return rctrl;
}


static void rate_control_simple_free(void *priv)
{
	struct global_rate_control *rctrl = priv;
	kfree(rctrl);
}


static void rate_control_simple_clear(void *priv)
{
}


static void * rate_control_simple_alloc_sta(void *priv, gfp_t gfp)
{
	struct sta_rate_control *rctrl;

	rctrl = kzalloc(sizeof(*rctrl), gfp);

	return rctrl;
}


static void rate_control_simple_free_sta(void *priv, void *priv_sta)
{
	struct sta_rate_control *rctrl = priv_sta;
	kfree(rctrl);
}

#ifdef CONFIG_MAC80211_DEBUGFS

static int open_file_generic(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static ssize_t sta_tx_avg_rate_sum_read(struct file *file,
					char __user *userbuf,
					size_t count, loff_t *ppos)
{
	struct sta_rate_control *srctrl = file->private_data;
	char buf[20];

	sprintf(buf, "%d\n", srctrl->tx_avg_rate_sum);
	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
}

static const struct file_operations sta_tx_avg_rate_sum_ops = {
	.read = sta_tx_avg_rate_sum_read,
	.open = open_file_generic,
};

static ssize_t sta_tx_avg_rate_num_read(struct file *file,
					char __user *userbuf,
					size_t count, loff_t *ppos)
{
	struct sta_rate_control *srctrl = file->private_data;
	char buf[20];

	sprintf(buf, "%d\n", srctrl->tx_avg_rate_num);
	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
}

static const struct file_operations sta_tx_avg_rate_num_ops = {
	.read = sta_tx_avg_rate_num_read,
	.open = open_file_generic,
};

static void rate_control_simple_add_sta_debugfs(void *priv, void *priv_sta,
						struct dentry *dir)
{
	struct sta_rate_control *srctrl = priv_sta;

	srctrl->tx_avg_rate_num_dentry =
		debugfs_create_file("rc_simple_sta_tx_avg_rate_num", 0400,
				    dir, srctrl, &sta_tx_avg_rate_num_ops);
	srctrl->tx_avg_rate_sum_dentry =
		debugfs_create_file("rc_simple_sta_tx_avg_rate_sum", 0400,
				    dir, srctrl, &sta_tx_avg_rate_sum_ops);
}

static void rate_control_simple_remove_sta_debugfs(void *priv, void *priv_sta)
{
	struct sta_rate_control *srctrl = priv_sta;

	debugfs_remove(srctrl->tx_avg_rate_sum_dentry);
	debugfs_remove(srctrl->tx_avg_rate_num_dentry);
}
#endif

static struct rate_control_ops mac80211_rcsimple = {
	.name = "simple",
	.tx_status = rate_control_simple_tx_status,
	.get_rate = rate_control_simple_get_rate,
	.rate_init = rate_control_simple_rate_init,
	.clear = rate_control_simple_clear,
	.alloc = rate_control_simple_alloc,
	.free = rate_control_simple_free,
	.alloc_sta = rate_control_simple_alloc_sta,
	.free_sta = rate_control_simple_free_sta,
#ifdef CONFIG_MAC80211_DEBUGFS
	.add_sta_debugfs = rate_control_simple_add_sta_debugfs,
	.remove_sta_debugfs = rate_control_simple_remove_sta_debugfs,
#endif
};

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Simple rate control algorithm");

int __init rc80211_simple_init(void)
{
	return ieee80211_rate_control_register(&mac80211_rcsimple);
}

void rc80211_simple_exit(void)
{
	ieee80211_rate_control_unregister(&mac80211_rcsimple);
}

#ifdef CONFIG_MAC80211_RC_SIMPLE_MODULE
module_init(rc80211_simple_init);
module_exit(rc80211_simple_exit);
#endif
Commit	Line	Data
f0706e82 JB	1	/*
	2	* Copyright 2002-2005, Instant802 Networks, Inc.
	3	* Copyright 2005, Devicescape Software, Inc.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
f0706e82 JB	10	#include <linux/init.h>
	11	#include <linux/netdevice.h>
	12	#include <linux/types.h>
	13	#include <linux/slab.h>
	14	#include <linux/skbuff.h>
	15	#include <linux/compiler.h>
4b475898	16	#include <linux/module.h>
f0706e82 JB	17
	18	#include <net/mac80211.h>
	19	#include "ieee80211_i.h"
	20	#include "ieee80211_rate.h"
e9f207f0	21	#include "debugfs.h"
f0706e82 JB	22
	23
	24	/* This is a minimal implementation of TX rate controlling that can be used
	25	* as the default when no improved mechanisms are available. */
	26
1abbe498 MN	27	#define RATE_CONTROL_NUM_DOWN 20
1abbe498 MN	28	#define RATE_CONTROL_NUM_UP 15
f0706e82 JB	29
	30	#define RATE_CONTROL_EMERG_DEC 2
	31	#define RATE_CONTROL_INTERVAL (HZ / 20)
	32	#define RATE_CONTROL_MIN_TX 10
	33
f0706e82 JB	34	static void rate_control_rate_inc(struct ieee80211_local *local,
	35	struct sta_info *sta)
	36	{
	37	struct ieee80211_sub_if_data *sdata;
8318d78a JB	38	struct ieee80211_supported_band *sband;
8318d78a JB	39	int i = sta->txrate_idx;
f0706e82 JB	40	int maxrate;
	41
	42	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	43	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
	44	/* forced unicast rate - do not change STA rate */
	45	return;
	46	}
	47
8318d78a	48	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
f0706e82 JB	49	maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;
f0706e82 JB	50
8318d78a JB	51	if (i > sband->n_bitrates)
8318d78a JB	52	i = sband->n_bitrates - 2;
f0706e82	53
8318d78a	54	while (i + 1 < sband->n_bitrates) {
f0706e82	55	i++;
8318d78a	56	if (rate_supported(sta, sband->band, i) &&
f0706e82	57	(maxrate < 0 \|\| i <= maxrate)) {
8318d78a	58	sta->txrate_idx = i;
f0706e82 JB	59	break;
	60	}
	61	}
	62	}
	63
	64
	65	static void rate_control_rate_dec(struct ieee80211_local *local,
	66	struct sta_info *sta)
	67	{
	68	struct ieee80211_sub_if_data *sdata;
8318d78a JB	69	struct ieee80211_supported_band *sband;
8318d78a JB	70	int i = sta->txrate_idx;
f0706e82 JB	71
	72	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	73	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
	74	/* forced unicast rate - do not change STA rate */
	75	return;
	76	}
	77
8318d78a JB	78	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	79	if (i > sband->n_bitrates)
	80	i = sband->n_bitrates;
f0706e82 JB	81
	82	while (i > 0) {
	83	i--;
8318d78a JB	84	if (rate_supported(sta, sband->band, i)) {
8318d78a JB	85	sta->txrate_idx = i;
f0706e82 JB	86	break;
	87	}
	88	}
	89	}
	90
f0706e82 JB	91	struct global_rate_control {
	92	int dummy;
	93	};
	94
	95	struct sta_rate_control {
	96	unsigned long last_rate_change;
	97	u32 tx_num_failures;
	98	u32 tx_num_xmit;
	99
	100	unsigned long avg_rate_update;
	101	u32 tx_avg_rate_sum;
	102	u32 tx_avg_rate_num;
e9f207f0 JB	103
	104	#ifdef CONFIG_MAC80211_DEBUGFS
	105	struct dentry *tx_avg_rate_sum_dentry;
	106	struct dentry *tx_avg_rate_num_dentry;
	107	#endif
f0706e82 JB	108	};
	109
	110
	111	static void rate_control_simple_tx_status(void priv, struct net_device dev,
	112	struct sk_buff *skb,
	113	struct ieee80211_tx_status *status)
	114	{
	115	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	116	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	117	struct sta_info *sta;
	118	struct sta_rate_control *srctrl;
	119
	120	sta = sta_info_get(local, hdr->addr1);
	121
	122	if (!sta)
	123	return;
	124
	125	srctrl = sta->rate_ctrl_priv;
	126	srctrl->tx_num_xmit++;
	127	if (status->excessive_retries) {
f0706e82 JB	128	srctrl->tx_num_failures++;
	129	sta->tx_retry_failed++;
	130	sta->tx_num_consecutive_failures++;
	131	sta->tx_num_mpdu_fail++;
	132	} else {
	133	sta->last_ack_rssi[0] = sta->last_ack_rssi[1];
	134	sta->last_ack_rssi[1] = sta->last_ack_rssi[2];
	135	sta->last_ack_rssi[2] = status->ack_signal;
	136	sta->tx_num_consecutive_failures = 0;
	137	sta->tx_num_mpdu_ok++;
	138	}
	139	sta->tx_retry_count += status->retry_count;
	140	sta->tx_num_mpdu_fail += status->retry_count;
	141
	142	if (time_after(jiffies,
	143	srctrl->last_rate_change + RATE_CONTROL_INTERVAL) &&
	144	srctrl->tx_num_xmit > RATE_CONTROL_MIN_TX) {
	145	u32 per_failed;
	146	srctrl->last_rate_change = jiffies;
	147
	148	per_failed = (100 * sta->tx_num_mpdu_fail) /
	149	(sta->tx_num_mpdu_fail + sta->tx_num_mpdu_ok);
	150	/* TODO: calculate average per_failed to make adjusting
	151	* parameters easier */
	152	#if 0
	153	if (net_ratelimit()) {
	154	printk(KERN_DEBUG "MPDU fail=%d ok=%d per_failed=%d\n",
	155	sta->tx_num_mpdu_fail, sta->tx_num_mpdu_ok,
	156	per_failed);
	157	}
	158	#endif
	159
3ef8bed4 JB	160	/*
	161	* XXX: Make these configurable once we have an
	162	* interface to the rate control algorithms
	163	*/
	164	if (per_failed > RATE_CONTROL_NUM_DOWN) {
f0706e82	165	rate_control_rate_dec(local, sta);
3ef8bed4	166	} else if (per_failed < RATE_CONTROL_NUM_UP) {
f0706e82 JB	167	rate_control_rate_inc(local, sta);
f0706e82 JB	168	}
8318d78a	169	srctrl->tx_avg_rate_sum += status->control.tx_rate->bitrate;
f0706e82 JB	170	srctrl->tx_avg_rate_num++;
	171	srctrl->tx_num_failures = 0;
	172	srctrl->tx_num_xmit = 0;
	173	} else if (sta->tx_num_consecutive_failures >=
	174	RATE_CONTROL_EMERG_DEC) {
	175	rate_control_rate_dec(local, sta);
	176	}
	177
	178	if (srctrl->avg_rate_update + 60 * HZ < jiffies) {
	179	srctrl->avg_rate_update = jiffies;
	180	if (srctrl->tx_avg_rate_num > 0) {
	181	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0795af57 JP	182	DECLARE_MAC_BUF(mac);
0795af57 JP	183	printk(KERN_DEBUG "%s: STA %s Average rate: "
f0706e82	184	"%d (%d/%d)\n",
0795af57	185	dev->name, print_mac(mac, sta->addr),
f0706e82 JB	186	srctrl->tx_avg_rate_sum /
	187	srctrl->tx_avg_rate_num,
	188	srctrl->tx_avg_rate_sum,
	189	srctrl->tx_avg_rate_num);
	190	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
	191	srctrl->tx_avg_rate_sum = 0;
	192	srctrl->tx_avg_rate_num = 0;
	193	}
	194	}
	195
	196	sta_info_put(sta);
	197	}
	198
	199
1abbe498	200	static void
f0706e82	201	rate_control_simple_get_rate(void priv, struct net_device dev,
8318d78a	202	struct ieee80211_supported_band *sband,
f0706e82	203	struct sk_buff *skb,
1abbe498	204	struct rate_selection *sel)
f0706e82 JB	205	{
f0706e82 JB	206	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
f0706e82	207	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
2bc454b0	208	struct ieee80211_sub_if_data *sdata;
f0706e82	209	struct sta_info *sta;
1abbe498	210	int rateidx;
2bc454b0	211	u16 fc;
f0706e82 JB	212
	213	sta = sta_info_get(local, hdr->addr1);
	214
2bc454b0 MW	215	/* Send management frames and broadcast/multicast data using lowest
	216	* rate. */
	217	fc = le16_to_cpu(hdr->frame_control);
	218	if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA \|\|
	219	is_multicast_ether_addr(hdr->addr1) \|\| !sta) {
8318d78a	220	sel->rate = rate_lowest(local, sband, sta);
2bc454b0 MW	221	if (sta)
2bc454b0 MW	222	sta_info_put(sta);
1abbe498 MN	223	return;
1abbe498 MN	224	}
f0706e82	225
2bc454b0 MW	226	/* If a forced rate is in effect, select it. */
	227	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	228	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
8318d78a	229	sta->txrate_idx = sdata->bss->force_unicast_rateidx;
2bc454b0	230
8318d78a	231	rateidx = sta->txrate_idx;
f0706e82	232
8318d78a JB	233	if (rateidx >= sband->n_bitrates)
8318d78a JB	234	rateidx = sband->n_bitrates - 1;
f0706e82	235
8318d78a	236	sta->last_txrate_idx = rateidx;
2bc454b0	237
f0706e82 JB	238	sta_info_put(sta);
f0706e82 JB	239
8318d78a	240	sel->rate = &sband->bitrates[rateidx];
f0706e82 JB	241	}
	242
	243
	244	static void rate_control_simple_rate_init(void priv, void priv_sta,
	245	struct ieee80211_local *local,
	246	struct sta_info *sta)
	247	{
8318d78a JB	248	struct ieee80211_supported_band *sband;
	249
	250	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
	251
eef6caf8 LF	252	/* TODO: This routine should consider using RSSI from previous packets
	253	* as we need to have IEEE 802.1X auth succeed immediately after assoc..
	254	* Until that method is implemented, we will use the lowest supported rate
	255	* as a workaround, */
8318d78a	256	sta->txrate_idx = rate_lowest_index(local, sband, sta);
f0706e82 JB	257	}
	258
	259
	260	static void * rate_control_simple_alloc(struct ieee80211_local *local)
	261	{
	262	struct global_rate_control *rctrl;
	263
	264	rctrl = kzalloc(sizeof(*rctrl), GFP_ATOMIC);
	265
	266	return rctrl;
	267	}
	268
	269
	270	static void rate_control_simple_free(void *priv)
	271	{
	272	struct global_rate_control *rctrl = priv;
	273	kfree(rctrl);
	274	}
	275
	276
	277	static void rate_control_simple_clear(void *priv)
	278	{
	279	}
	280
	281
	282	static void * rate_control_simple_alloc_sta(void *priv, gfp_t gfp)
	283	{
	284	struct sta_rate_control *rctrl;
	285
	286	rctrl = kzalloc(sizeof(*rctrl), gfp);
	287
	288	return rctrl;
	289	}
	290
	291
	292	static void rate_control_simple_free_sta(void priv, void priv_sta)
	293	{
	294	struct sta_rate_control *rctrl = priv_sta;
	295	kfree(rctrl);
	296	}
	297
e9f207f0 JB	298	#ifdef CONFIG_MAC80211_DEBUGFS
	299
	300	static int open_file_generic(struct inode inode, struct file file)
	301	{
	302	file->private_data = inode->i_private;
	303	return 0;
	304	}
	305
	306	static ssize_t sta_tx_avg_rate_sum_read(struct file *file,
	307	char __user *userbuf,
	308	size_t count, loff_t *ppos)
	309	{
	310	struct sta_rate_control *srctrl = file->private_data;
	311	char buf[20];
	312
	313	sprintf(buf, "%d\n", srctrl->tx_avg_rate_sum);
	314	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
	315	}
	316
	317	static const struct file_operations sta_tx_avg_rate_sum_ops = {
	318	.read = sta_tx_avg_rate_sum_read,
	319	.open = open_file_generic,
	320	};
	321
	322	static ssize_t sta_tx_avg_rate_num_read(struct file *file,
	323	char __user *userbuf,
	324	size_t count, loff_t *ppos)
	325	{
	326	struct sta_rate_control *srctrl = file->private_data;
	327	char buf[20];
	328
	329	sprintf(buf, "%d\n", srctrl->tx_avg_rate_num);
	330	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
	331	}
	332
	333	static const struct file_operations sta_tx_avg_rate_num_ops = {
	334	.read = sta_tx_avg_rate_num_read,
	335	.open = open_file_generic,
	336	};
	337
	338	static void rate_control_simple_add_sta_debugfs(void priv, void priv_sta,
	339	struct dentry *dir)
	340	{
	341	struct sta_rate_control *srctrl = priv_sta;
	342
	343	srctrl->tx_avg_rate_num_dentry =
	344	debugfs_create_file("rc_simple_sta_tx_avg_rate_num", 0400,
	345	dir, srctrl, &sta_tx_avg_rate_num_ops);
	346	srctrl->tx_avg_rate_sum_dentry =
	347	debugfs_create_file("rc_simple_sta_tx_avg_rate_sum", 0400,
	348	dir, srctrl, &sta_tx_avg_rate_sum_ops);
	349	}
	350
	351	static void rate_control_simple_remove_sta_debugfs(void priv, void priv_sta)
	352	{
	353	struct sta_rate_control *srctrl = priv_sta;
	354
	355	debugfs_remove(srctrl->tx_avg_rate_sum_dentry);
	356	debugfs_remove(srctrl->tx_avg_rate_num_dentry);
	357	}
	358	#endif
f0706e82	359
4b475898	360	static struct rate_control_ops mac80211_rcsimple = {
f0706e82 JB	361	.name = "simple",
	362	.tx_status = rate_control_simple_tx_status,
	363	.get_rate = rate_control_simple_get_rate,
	364	.rate_init = rate_control_simple_rate_init,
	365	.clear = rate_control_simple_clear,
	366	.alloc = rate_control_simple_alloc,
	367	.free = rate_control_simple_free,
	368	.alloc_sta = rate_control_simple_alloc_sta,
	369	.free_sta = rate_control_simple_free_sta,
e9f207f0 JB	370	#ifdef CONFIG_MAC80211_DEBUGFS
	371	.add_sta_debugfs = rate_control_simple_add_sta_debugfs,
	372	.remove_sta_debugfs = rate_control_simple_remove_sta_debugfs,
	373	#endif
f0706e82	374	};
4b475898 JB	375
	376	MODULE_LICENSE("GPL");
	377	MODULE_DESCRIPTION("Simple rate control algorithm");
	378
	379	int __init rc80211_simple_init(void)
	380	{
	381	return ieee80211_rate_control_register(&mac80211_rcsimple);
	382	}
	383
f0b9205c	384	void rc80211_simple_exit(void)
4b475898 JB	385	{
	386	ieee80211_rate_control_unregister(&mac80211_rcsimple);
	387	}
	388
	389	#ifdef CONFIG_MAC80211_RC_SIMPLE_MODULE
	390	module_init(rc80211_simple_init);
	391	module_exit(rc80211_simple_exit);
	392	#endif