+++ /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/config.h>
-#include <linux/version.h>
-#include <linux/module.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 <net/ieee80211.h>
-#include "ieee80211_i.h"
-#include "rate_control.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_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;
- 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;
- }
-
- maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;
-
- if (i > local->num_curr_rates)
- i = local->num_curr_rates - 2;
-
- while (i + 1 < local->num_curr_rates) {
- i++;
- if (sta->supp_rates & BIT(i) &&
- local->curr_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;
- 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;
- }
-
- if (i > local->num_curr_rates)
- i = local->num_curr_rates;
-
- while (i > 0) {
- i--;
- if (sta->supp_rates & BIT(i) &&
- local->curr_rates[i].flags & IEEE80211_RATE_SUPPORTED) {
- sta->txrate = i;
- break;
- }
- }
-}
-
-
-static struct ieee80211_rate *
-rate_control_lowest_rate(struct ieee80211_local *local)
-{
- int i;
-
- for (i = 0; i < local->num_curr_rates; i++) {
- struct ieee80211_rate *rate = &local->curr_rates[i];
-
- if (rate->flags & IEEE80211_RATE_SUPPORTED
- )
- return rate;
- }
-
- printk(KERN_DEBUG "rate_control_lowest_rate - no supported rates "
- "found\n");
- return &local->curr_rates[0];
-}
-
-
-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;
-};
-
-
-static void rate_control_simple_tx_status(struct net_device *dev,
- struct sk_buff *skb,
- struct ieee80211_tx_status *status)
-{
- struct ieee80211_local *local = dev->priv;
- 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) {
- sta->antenna_sel = sta->antenna_sel == 1 ? 2 : 1;
- if (local->sta_antenna_sel == STA_ANTENNA_SEL_SW_CTRL_DEBUG) {
- printk(KERN_DEBUG "%s: " MACSTR " TX antenna --> %d "
- "(@%lu)\n",
- dev->name, MAC2STR(hdr->addr1),
- sta->antenna_sel, jiffies);
- }
- 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
-
- if (per_failed > local->rate_ctrl_num_down) {
- rate_control_rate_dec(local, sta);
- } else if (per_failed < local->rate_ctrl_num_up) {
- rate_control_rate_inc(local, sta);
- }
- srctrl->tx_avg_rate_sum += local->curr_rates[sta->txrate].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_IEEE80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: STA " MACSTR " Average rate: "
- "%d (%d/%d)\n",
- dev->name, MAC2STR(sta->addr),
- srctrl->tx_avg_rate_sum /
- srctrl->tx_avg_rate_num,
- srctrl->tx_avg_rate_sum,
- srctrl->tx_avg_rate_num);
-#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
- srctrl->tx_avg_rate_sum = 0;
- srctrl->tx_avg_rate_num = 0;
- }
- }
-
- sta_info_release(local, sta);
-}
-
-
-static struct ieee80211_rate *
-rate_control_simple_get_rate(struct net_device *dev, struct sk_buff *skb,
- struct rate_control_extra *extra)
-{
- struct ieee80211_local *local = dev->priv;
- struct ieee80211_sub_if_data *sdata;
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
- struct sta_info *sta;
- int rateidx, nonerp_idx;
- u16 fc;
-
- memset(extra, 0, sizeof(*extra));
-
- fc = le16_to_cpu(hdr->frame_control);
- if (WLAN_FC_GET_TYPE(fc) != WLAN_FC_TYPE_DATA ||
- (hdr->addr1[0] & 0x01)) {
- /* Send management frames and broadcast/multicast data using
- * lowest rate. */
- /* TODO: this could probably be improved.. */
- return rate_control_lowest_rate(local);
- }
-
- sta = sta_info_get(local, hdr->addr1);
-
- if (!sta)
- return rate_control_lowest_rate(local);
-
- 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 >= local->num_curr_rates)
- rateidx = local->num_curr_rates - 1;
-
- sta->last_txrate = rateidx;
- nonerp_idx = rateidx;
- while (nonerp_idx > 0 &&
- ((local->curr_rates[nonerp_idx].flags & IEEE80211_RATE_ERP) ||
- !(local->curr_rates[nonerp_idx].flags &
- IEEE80211_RATE_SUPPORTED) ||
- !(sta->supp_rates & BIT(nonerp_idx))))
- nonerp_idx--;
- extra->nonerp_idx = nonerp_idx;
- extra->nonerp = &local->curr_rates[extra->nonerp_idx];
-
- sta_info_release(local, sta);
-
- return &local->curr_rates[rateidx];
-}
-
-
-static void rate_control_simple_rate_init(struct ieee80211_local *local,
- struct sta_info *sta)
-{
- int i;
- sta->txrate = 0;
- /* TODO: what is a good starting rate for STA? About middle? Maybe not
- * the lowest or the highest rate.. Could consider using RSSI from
- * previous packets? Need to have IEEE 802.1X auth succeed immediately
- * after assoc.. */
- for (i = 0; i < local->num_curr_rates; i++) {
- if ((sta->supp_rates & BIT(i)) &&
- (local->curr_rates[i].flags & IEEE80211_RATE_SUPPORTED))
- sta->txrate = i;
- }
-}
-
-
-static void * rate_control_simple_alloc(struct ieee80211_local *local)
-{
- struct global_rate_control *rctrl;
-
- rctrl = kmalloc(sizeof(*rctrl), GFP_ATOMIC);
- if (rctrl == NULL) {
- return NULL;
- }
- memset(rctrl, 0, sizeof(*rctrl));
- 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)
-{
- struct sta_rate_control *rctrl;
-
- rctrl = kmalloc(sizeof(*rctrl), GFP_ATOMIC);
- if (rctrl == NULL) {
- return NULL;
- }
- memset(rctrl, 0, sizeof(*rctrl));
- return rctrl;
-}
-
-
-static void rate_control_simple_free_sta(void *priv)
-{
- struct sta_rate_control *rctrl = priv;
- kfree(rctrl);
-}
-
-
-static int rate_control_simple_status_sta(struct ieee80211_local *local,
- struct sta_info *sta, char *buf)
-{
- char *p = buf;
- struct sta_rate_control *srctrl = sta->rate_ctrl_priv;
-
- p += sprintf(p, "tx_avg_rate_sum=%d\n", srctrl->tx_avg_rate_sum);
- p += sprintf(p, "tx_avg_rate_num=%d\n", srctrl->tx_avg_rate_num);
- if (srctrl->tx_avg_rate_num)
- p += sprintf(p, "tx_avg_rate_avg=%d\n",
- srctrl->tx_avg_rate_sum /
- srctrl->tx_avg_rate_num);
- return p - buf;
-}
-
-
-static int rate_control_simple_status_global(struct ieee80211_local *local,
- char *buf)
-{
- return 0;
-}
-
-
-static struct rate_control_ops rate_control_simple = {
- .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,
- .status_sta = rate_control_simple_status_sta,
- .status_global = rate_control_simple_status_global,
- .alloc = rate_control_simple_alloc,
- .free = rate_control_simple_free,
- .alloc_sta = rate_control_simple_alloc_sta,
- .free_sta = rate_control_simple_free_sta,
-};
-
-
-int __init rate_control_simple_init(void)
-{
- return ieee80211_rate_control_register(&rate_control_simple);
-}
-
-
-static void __exit rate_control_simple_exit(void)
-{
- ieee80211_rate_control_unregister(&rate_control_simple);
-}
-
-
-module_init(rate_control_simple_init);
-module_exit(rate_control_simple_exit);
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