+++ /dev/null
-/*
- * 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/jiffies.h>
-#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 = sta->sdata;
- 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 = sta->sdata;
- 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;
-
- rcu_read_lock();
-
- sta = sta_info_get(local, hdr->addr1);
-
- if (!sta)
- goto unlock;
-
- 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->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 (time_after(jiffies, srctrl->avg_rate_update + 60 * HZ)) {
- 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;
- }
- }
-
- unlock:
- rcu_read_unlock();
-}
-
-
-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;
-
- rcu_read_lock();
-
- 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);
- rcu_read_unlock();
- 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;
-
- rcu_read_unlock();
-
- 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
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