[deliverable/linux.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_hw_mode *mode;
	int i = sta->txrate;
	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;
	}

	mode = local->oper_hw_mode;
	maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;

	if (i > mode->num_rates)
		i = mode->num_rates - 2;

	while (i + 1 < mode->num_rates) {
		i++;
		if (sta->supp_rates & BIT(i) &&
		    mode->rates[i].flags & IEEE80211_RATE_SUPPORTED &&
		    (maxrate < 0 || i <= maxrate)) {
			sta->txrate = i;
			break;
		}
	}
}


static void rate_control_rate_dec(struct ieee80211_local *local,
				  struct sta_info *sta)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_hw_mode *mode;
	int i = sta->txrate;

	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;
	}

	mode = local->oper_hw_mode;
	if (i > mode->num_rates)
		i = mode->num_rates;

	while (i > 0) {
		i--;
		if (sta->supp_rates & BIT(i) &&
		    mode->rates[i].flags & IEEE80211_RATE_SUPPORTED) {
			sta->txrate = 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.rate->rate;
		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_hw_mode *mode,
			     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, mode, 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 = sdata->bss->force_unicast_rateidx;

	rateidx = sta->txrate;

	if (rateidx >= mode->num_rates)
		rateidx = mode->num_rates - 1;

	sta->last_txrate = rateidx;

	sta_info_put(sta);

	sel->rate = &mode->rates[rateidx];
}


static void rate_control_simple_rate_init(void *priv, void *priv_sta,
					  struct ieee80211_local *local,
					  struct sta_info *sta)
{
	struct ieee80211_hw_mode *mode;
	int i;
	sta->txrate = 0;
	mode = local->oper_hw_mode;
	/* 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, */
	for (i = 0; i < mode->num_rates; i++) {
		if ((sta->supp_rates & BIT(i)) &&
		    (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED)) {
			sta->txrate = i;
			break;
		}
	}
}


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;
	38	struct ieee80211_hw_mode *mode;
	39	int i = sta->txrate;
	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
	48	mode = local->oper_hw_mode;
	49	maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;
	50
	51	if (i > mode->num_rates)
	52	i = mode->num_rates - 2;
	53
	54	while (i + 1 < mode->num_rates) {
	55	i++;
	56	if (sta->supp_rates & BIT(i) &&
	57	mode->rates[i].flags & IEEE80211_RATE_SUPPORTED &&
	58	(maxrate < 0 \|\| i <= maxrate)) {
	59	sta->txrate = i;
	60	break;
	61	}
	62	}
	63	}
	64
	65
	66	static void rate_control_rate_dec(struct ieee80211_local *local,
	67	struct sta_info *sta)
	68	{
	69	struct ieee80211_sub_if_data *sdata;
	70	struct ieee80211_hw_mode *mode;
	71	int i = sta->txrate;
	72
	73	sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
	74	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
	75	/* forced unicast rate - do not change STA rate */
	76	return;
	77	}
	78
	79	mode = local->oper_hw_mode;
	80	if (i > mode->num_rates)
	81	i = mode->num_rates;
	82
	83	while (i > 0) {
	84	i--;
	85	if (sta->supp_rates & BIT(i) &&
	86	mode->rates[i].flags & IEEE80211_RATE_SUPPORTED) {
	87	sta->txrate = i;
	88	break;
	89	}
	90	}
	91	}
	92
f0706e82 JB	93	struct global_rate_control {
	94	int dummy;
	95	};
	96
	97	struct sta_rate_control {
	98	unsigned long last_rate_change;
	99	u32 tx_num_failures;
	100	u32 tx_num_xmit;
	101
	102	unsigned long avg_rate_update;
	103	u32 tx_avg_rate_sum;
	104	u32 tx_avg_rate_num;
e9f207f0 JB	105
	106	#ifdef CONFIG_MAC80211_DEBUGFS
	107	struct dentry *tx_avg_rate_sum_dentry;
	108	struct dentry *tx_avg_rate_num_dentry;
	109	#endif
f0706e82 JB	110	};
	111
	112
	113	static void rate_control_simple_tx_status(void priv, struct net_device dev,
	114	struct sk_buff *skb,
	115	struct ieee80211_tx_status *status)
	116	{
	117	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	118	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	119	struct sta_info *sta;
	120	struct sta_rate_control *srctrl;
	121
	122	sta = sta_info_get(local, hdr->addr1);
	123
	124	if (!sta)
	125	return;
	126
	127	srctrl = sta->rate_ctrl_priv;
	128	srctrl->tx_num_xmit++;
	129	if (status->excessive_retries) {
f0706e82 JB	130	srctrl->tx_num_failures++;
	131	sta->tx_retry_failed++;
	132	sta->tx_num_consecutive_failures++;
	133	sta->tx_num_mpdu_fail++;
	134	} else {
	135	sta->last_ack_rssi[0] = sta->last_ack_rssi[1];
	136	sta->last_ack_rssi[1] = sta->last_ack_rssi[2];
	137	sta->last_ack_rssi[2] = status->ack_signal;
	138	sta->tx_num_consecutive_failures = 0;
	139	sta->tx_num_mpdu_ok++;
	140	}
	141	sta->tx_retry_count += status->retry_count;
	142	sta->tx_num_mpdu_fail += status->retry_count;
	143
	144	if (time_after(jiffies,
	145	srctrl->last_rate_change + RATE_CONTROL_INTERVAL) &&
	146	srctrl->tx_num_xmit > RATE_CONTROL_MIN_TX) {
	147	u32 per_failed;
	148	srctrl->last_rate_change = jiffies;
	149
	150	per_failed = (100 * sta->tx_num_mpdu_fail) /
	151	(sta->tx_num_mpdu_fail + sta->tx_num_mpdu_ok);
	152	/* TODO: calculate average per_failed to make adjusting
	153	* parameters easier */
	154	#if 0
	155	if (net_ratelimit()) {
	156	printk(KERN_DEBUG "MPDU fail=%d ok=%d per_failed=%d\n",
	157	sta->tx_num_mpdu_fail, sta->tx_num_mpdu_ok,
	158	per_failed);
	159	}
	160	#endif
	161
3ef8bed4 JB	162	/*
	163	* XXX: Make these configurable once we have an
	164	* interface to the rate control algorithms
	165	*/
	166	if (per_failed > RATE_CONTROL_NUM_DOWN) {
f0706e82	167	rate_control_rate_dec(local, sta);
3ef8bed4	168	} else if (per_failed < RATE_CONTROL_NUM_UP) {
f0706e82 JB	169	rate_control_rate_inc(local, sta);
	170	}
	171	srctrl->tx_avg_rate_sum += status->control.rate->rate;
	172	srctrl->tx_avg_rate_num++;
	173	srctrl->tx_num_failures = 0;
	174	srctrl->tx_num_xmit = 0;
	175	} else if (sta->tx_num_consecutive_failures >=
	176	RATE_CONTROL_EMERG_DEC) {
	177	rate_control_rate_dec(local, sta);
	178	}
	179
	180	if (srctrl->avg_rate_update + 60 * HZ < jiffies) {
	181	srctrl->avg_rate_update = jiffies;
	182	if (srctrl->tx_avg_rate_num > 0) {
	183	#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0795af57 JP	184	DECLARE_MAC_BUF(mac);
0795af57 JP	185	printk(KERN_DEBUG "%s: STA %s Average rate: "
f0706e82	186	"%d (%d/%d)\n",
0795af57	187	dev->name, print_mac(mac, sta->addr),
f0706e82 JB	188	srctrl->tx_avg_rate_sum /
	189	srctrl->tx_avg_rate_num,
	190	srctrl->tx_avg_rate_sum,
	191	srctrl->tx_avg_rate_num);
	192	#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
	193	srctrl->tx_avg_rate_sum = 0;
	194	srctrl->tx_avg_rate_num = 0;
	195	}
	196	}
	197
	198	sta_info_put(sta);
	199	}
	200
	201
1abbe498	202	static void
f0706e82	203	rate_control_simple_get_rate(void priv, struct net_device dev,
1abbe498	204	struct ieee80211_hw_mode *mode,
f0706e82	205	struct sk_buff *skb,
1abbe498	206	struct rate_selection *sel)
f0706e82 JB	207	{
f0706e82 JB	208	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
f0706e82	209	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
2bc454b0	210	struct ieee80211_sub_if_data *sdata;
f0706e82	211	struct sta_info *sta;
1abbe498	212	int rateidx;
2bc454b0	213	u16 fc;
f0706e82 JB	214
	215	sta = sta_info_get(local, hdr->addr1);
	216
2bc454b0 MW	217	/* Send management frames and broadcast/multicast data using lowest
	218	* rate. */
	219	fc = le16_to_cpu(hdr->frame_control);
	220	if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA \|\|
	221	is_multicast_ether_addr(hdr->addr1) \|\| !sta) {
	222	sel->rate = rate_lowest(local, mode, sta);
	223	if (sta)
	224	sta_info_put(sta);
1abbe498 MN	225	return;
1abbe498 MN	226	}
f0706e82	227
2bc454b0 MW	228	/* If a forced rate is in effect, select it. */
	229	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	230	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
	231	sta->txrate = sdata->bss->force_unicast_rateidx;
	232
f0706e82 JB	233	rateidx = sta->txrate;
	234
	235	if (rateidx >= mode->num_rates)
	236	rateidx = mode->num_rates - 1;
	237
2bc454b0 MW	238	sta->last_txrate = rateidx;
2bc454b0 MW	239
f0706e82 JB	240	sta_info_put(sta);
f0706e82 JB	241
1abbe498	242	sel->rate = &mode->rates[rateidx];
f0706e82 JB	243	}
	244
	245
	246	static void rate_control_simple_rate_init(void priv, void priv_sta,
	247	struct ieee80211_local *local,
	248	struct sta_info *sta)
	249	{
	250	struct ieee80211_hw_mode *mode;
	251	int i;
	252	sta->txrate = 0;
	253	mode = local->oper_hw_mode;
eef6caf8 LF	254	/* TODO: This routine should consider using RSSI from previous packets
	255	* as we need to have IEEE 802.1X auth succeed immediately after assoc..
	256	* Until that method is implemented, we will use the lowest supported rate
	257	* as a workaround, */
f0706e82 JB	258	for (i = 0; i < mode->num_rates; i++) {
f0706e82 JB	259	if ((sta->supp_rates & BIT(i)) &&
eef6caf8	260	(mode->rates[i].flags & IEEE80211_RATE_SUPPORTED)) {
f0706e82	261	sta->txrate = i;
eef6caf8 LF	262	break;
eef6caf8 LF	263	}
f0706e82 JB	264	}
	265	}
	266
	267
	268	static void * rate_control_simple_alloc(struct ieee80211_local *local)
	269	{
	270	struct global_rate_control *rctrl;
	271
	272	rctrl = kzalloc(sizeof(*rctrl), GFP_ATOMIC);
	273
	274	return rctrl;
	275	}
	276
	277
	278	static void rate_control_simple_free(void *priv)
	279	{
	280	struct global_rate_control *rctrl = priv;
	281	kfree(rctrl);
	282	}
	283
	284
	285	static void rate_control_simple_clear(void *priv)
	286	{
	287	}
	288
	289
	290	static void * rate_control_simple_alloc_sta(void *priv, gfp_t gfp)
	291	{
	292	struct sta_rate_control *rctrl;
	293
	294	rctrl = kzalloc(sizeof(*rctrl), gfp);
	295
	296	return rctrl;
	297	}
	298
	299
	300	static void rate_control_simple_free_sta(void priv, void priv_sta)
	301	{
	302	struct sta_rate_control *rctrl = priv_sta;
	303	kfree(rctrl);
	304	}
	305
e9f207f0 JB	306	#ifdef CONFIG_MAC80211_DEBUGFS
	307
	308	static int open_file_generic(struct inode inode, struct file file)
	309	{
	310	file->private_data = inode->i_private;
	311	return 0;
	312	}
	313
	314	static ssize_t sta_tx_avg_rate_sum_read(struct file *file,
	315	char __user *userbuf,
	316	size_t count, loff_t *ppos)
	317	{
	318	struct sta_rate_control *srctrl = file->private_data;
	319	char buf[20];
	320
	321	sprintf(buf, "%d\n", srctrl->tx_avg_rate_sum);
	322	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
	323	}
	324
	325	static const struct file_operations sta_tx_avg_rate_sum_ops = {
	326	.read = sta_tx_avg_rate_sum_read,
	327	.open = open_file_generic,
	328	};
	329
	330	static ssize_t sta_tx_avg_rate_num_read(struct file *file,
	331	char __user *userbuf,
	332	size_t count, loff_t *ppos)
	333	{
	334	struct sta_rate_control *srctrl = file->private_data;
	335	char buf[20];
	336
	337	sprintf(buf, "%d\n", srctrl->tx_avg_rate_num);
	338	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
	339	}
	340
	341	static const struct file_operations sta_tx_avg_rate_num_ops = {
	342	.read = sta_tx_avg_rate_num_read,
	343	.open = open_file_generic,
	344	};
	345
	346	static void rate_control_simple_add_sta_debugfs(void priv, void priv_sta,
	347	struct dentry *dir)
	348	{
	349	struct sta_rate_control *srctrl = priv_sta;
	350
	351	srctrl->tx_avg_rate_num_dentry =
	352	debugfs_create_file("rc_simple_sta_tx_avg_rate_num", 0400,
	353	dir, srctrl, &sta_tx_avg_rate_num_ops);
	354	srctrl->tx_avg_rate_sum_dentry =
	355	debugfs_create_file("rc_simple_sta_tx_avg_rate_sum", 0400,
	356	dir, srctrl, &sta_tx_avg_rate_sum_ops);
	357	}
	358
	359	static void rate_control_simple_remove_sta_debugfs(void priv, void priv_sta)
	360	{
	361	struct sta_rate_control *srctrl = priv_sta;
	362
	363	debugfs_remove(srctrl->tx_avg_rate_sum_dentry);
	364	debugfs_remove(srctrl->tx_avg_rate_num_dentry);
	365	}
	366	#endif
f0706e82	367
4b475898	368	static struct rate_control_ops mac80211_rcsimple = {
f0706e82 JB	369	.name = "simple",
	370	.tx_status = rate_control_simple_tx_status,
	371	.get_rate = rate_control_simple_get_rate,
	372	.rate_init = rate_control_simple_rate_init,
	373	.clear = rate_control_simple_clear,
	374	.alloc = rate_control_simple_alloc,
	375	.free = rate_control_simple_free,
	376	.alloc_sta = rate_control_simple_alloc_sta,
	377	.free_sta = rate_control_simple_free_sta,
e9f207f0 JB	378	#ifdef CONFIG_MAC80211_DEBUGFS
	379	.add_sta_debugfs = rate_control_simple_add_sta_debugfs,
	380	.remove_sta_debugfs = rate_control_simple_remove_sta_debugfs,
	381	#endif
f0706e82	382	};
4b475898 JB	383
	384	MODULE_LICENSE("GPL");
	385	MODULE_DESCRIPTION("Simple rate control algorithm");
	386
	387	int __init rc80211_simple_init(void)
	388	{
	389	return ieee80211_rate_control_register(&mac80211_rcsimple);
	390	}
	391
f0b9205c	392	void rc80211_simple_exit(void)
4b475898 JB	393	{
	394	ieee80211_rate_control_unregister(&mac80211_rcsimple);
	395	}
	396
	397	#ifdef CONFIG_MAC80211_RC_SIMPLE_MODULE
	398	module_init(rc80211_simple_init);
	399	module_exit(rc80211_simple_exit);
	400	#endif