![Johannes Berg](/assets/img/avatar_default.png)
This patch creates new cfg80211 wiphy API for channel and bitrate registration and converts mac80211 and drivers to the new API. The old mac80211 API is completely ripped out. All drivers (except ath5k) are updated to the new API, in many cases I expect that optimisations can be done. Along with the regulatory code I've also ripped out the IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED flag, I believe it to be unnecessary if the hardware simply gives us whatever channels it wants to support and we then enable/disable them as required, which is pretty much required for travelling. Additionally, the patch adds proper "basic" rate handling for STA mode interface, AP mode interface will have to have new API added to allow userspace to set the basic rate set, currently it'll be empty... However, the basic rate handling will need to be moved to the BSS conf stuff. I do expect there to be bugs in this, especially wrt. transmit power handling where I'm basically clueless about how it should work. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
393 lines
10 KiB
C
393 lines
10 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005, Devicescape Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/compiler.h>
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#include <linux/module.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "ieee80211_rate.h"
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#include "debugfs.h"
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/* This is a minimal implementation of TX rate controlling that can be used
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* as the default when no improved mechanisms are available. */
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#define RATE_CONTROL_NUM_DOWN 20
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#define RATE_CONTROL_NUM_UP 15
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#define RATE_CONTROL_EMERG_DEC 2
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#define RATE_CONTROL_INTERVAL (HZ / 20)
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#define RATE_CONTROL_MIN_TX 10
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static void rate_control_rate_inc(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_supported_band *sband;
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int i = sta->txrate_idx;
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int maxrate;
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sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
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if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
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/* forced unicast rate - do not change STA rate */
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return;
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}
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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maxrate = sdata->bss ? sdata->bss->max_ratectrl_rateidx : -1;
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if (i > sband->n_bitrates)
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i = sband->n_bitrates - 2;
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while (i + 1 < sband->n_bitrates) {
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i++;
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if (rate_supported(sta, sband->band, i) &&
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(maxrate < 0 || i <= maxrate)) {
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sta->txrate_idx = i;
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break;
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}
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}
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}
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static void rate_control_rate_dec(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_supported_band *sband;
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int i = sta->txrate_idx;
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sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
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if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) {
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/* forced unicast rate - do not change STA rate */
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return;
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}
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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if (i > sband->n_bitrates)
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i = sband->n_bitrates;
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while (i > 0) {
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i--;
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if (rate_supported(sta, sband->band, i)) {
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sta->txrate_idx = i;
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break;
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}
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}
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}
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struct global_rate_control {
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int dummy;
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};
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struct sta_rate_control {
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unsigned long last_rate_change;
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u32 tx_num_failures;
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u32 tx_num_xmit;
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unsigned long avg_rate_update;
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u32 tx_avg_rate_sum;
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u32 tx_avg_rate_num;
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct dentry *tx_avg_rate_sum_dentry;
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struct dentry *tx_avg_rate_num_dentry;
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#endif
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};
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static void rate_control_simple_tx_status(void *priv, struct net_device *dev,
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struct sk_buff *skb,
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struct ieee80211_tx_status *status)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct sta_info *sta;
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struct sta_rate_control *srctrl;
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sta = sta_info_get(local, hdr->addr1);
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if (!sta)
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return;
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srctrl = sta->rate_ctrl_priv;
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srctrl->tx_num_xmit++;
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if (status->excessive_retries) {
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srctrl->tx_num_failures++;
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sta->tx_retry_failed++;
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sta->tx_num_consecutive_failures++;
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sta->tx_num_mpdu_fail++;
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} else {
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sta->last_ack_rssi[0] = sta->last_ack_rssi[1];
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sta->last_ack_rssi[1] = sta->last_ack_rssi[2];
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sta->last_ack_rssi[2] = status->ack_signal;
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sta->tx_num_consecutive_failures = 0;
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sta->tx_num_mpdu_ok++;
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}
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sta->tx_retry_count += status->retry_count;
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sta->tx_num_mpdu_fail += status->retry_count;
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if (time_after(jiffies,
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srctrl->last_rate_change + RATE_CONTROL_INTERVAL) &&
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srctrl->tx_num_xmit > RATE_CONTROL_MIN_TX) {
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u32 per_failed;
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srctrl->last_rate_change = jiffies;
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per_failed = (100 * sta->tx_num_mpdu_fail) /
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(sta->tx_num_mpdu_fail + sta->tx_num_mpdu_ok);
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/* TODO: calculate average per_failed to make adjusting
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* parameters easier */
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#if 0
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if (net_ratelimit()) {
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printk(KERN_DEBUG "MPDU fail=%d ok=%d per_failed=%d\n",
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sta->tx_num_mpdu_fail, sta->tx_num_mpdu_ok,
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per_failed);
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}
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#endif
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/*
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* XXX: Make these configurable once we have an
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* interface to the rate control algorithms
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*/
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if (per_failed > RATE_CONTROL_NUM_DOWN) {
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rate_control_rate_dec(local, sta);
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} else if (per_failed < RATE_CONTROL_NUM_UP) {
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rate_control_rate_inc(local, sta);
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}
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srctrl->tx_avg_rate_sum += status->control.tx_rate->bitrate;
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srctrl->tx_avg_rate_num++;
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srctrl->tx_num_failures = 0;
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srctrl->tx_num_xmit = 0;
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} else if (sta->tx_num_consecutive_failures >=
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RATE_CONTROL_EMERG_DEC) {
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rate_control_rate_dec(local, sta);
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}
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if (srctrl->avg_rate_update + 60 * HZ < jiffies) {
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srctrl->avg_rate_update = jiffies;
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if (srctrl->tx_avg_rate_num > 0) {
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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DECLARE_MAC_BUF(mac);
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printk(KERN_DEBUG "%s: STA %s Average rate: "
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"%d (%d/%d)\n",
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dev->name, print_mac(mac, sta->addr),
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srctrl->tx_avg_rate_sum /
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srctrl->tx_avg_rate_num,
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srctrl->tx_avg_rate_sum,
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srctrl->tx_avg_rate_num);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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srctrl->tx_avg_rate_sum = 0;
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srctrl->tx_avg_rate_num = 0;
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}
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}
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sta_info_put(sta);
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}
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static void
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rate_control_simple_get_rate(void *priv, struct net_device *dev,
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struct ieee80211_supported_band *sband,
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struct sk_buff *skb,
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struct rate_selection *sel)
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{
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struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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struct ieee80211_sub_if_data *sdata;
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struct sta_info *sta;
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int rateidx;
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u16 fc;
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sta = sta_info_get(local, hdr->addr1);
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/* Send management frames and broadcast/multicast data using lowest
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* rate. */
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fc = le16_to_cpu(hdr->frame_control);
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if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
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is_multicast_ether_addr(hdr->addr1) || !sta) {
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sel->rate = rate_lowest(local, sband, sta);
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if (sta)
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sta_info_put(sta);
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return;
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}
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/* If a forced rate is in effect, select it. */
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sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
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sta->txrate_idx = sdata->bss->force_unicast_rateidx;
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rateidx = sta->txrate_idx;
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if (rateidx >= sband->n_bitrates)
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rateidx = sband->n_bitrates - 1;
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sta->last_txrate_idx = rateidx;
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sta_info_put(sta);
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sel->rate = &sband->bitrates[rateidx];
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}
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static void rate_control_simple_rate_init(void *priv, void *priv_sta,
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struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct ieee80211_supported_band *sband;
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sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
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/* TODO: This routine should consider using RSSI from previous packets
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* as we need to have IEEE 802.1X auth succeed immediately after assoc..
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* Until that method is implemented, we will use the lowest supported rate
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* as a workaround, */
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sta->txrate_idx = rate_lowest_index(local, sband, sta);
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}
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static void * rate_control_simple_alloc(struct ieee80211_local *local)
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{
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struct global_rate_control *rctrl;
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rctrl = kzalloc(sizeof(*rctrl), GFP_ATOMIC);
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return rctrl;
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}
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static void rate_control_simple_free(void *priv)
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{
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struct global_rate_control *rctrl = priv;
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kfree(rctrl);
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}
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static void rate_control_simple_clear(void *priv)
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{
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}
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static void * rate_control_simple_alloc_sta(void *priv, gfp_t gfp)
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{
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struct sta_rate_control *rctrl;
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rctrl = kzalloc(sizeof(*rctrl), gfp);
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return rctrl;
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}
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static void rate_control_simple_free_sta(void *priv, void *priv_sta)
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{
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struct sta_rate_control *rctrl = priv_sta;
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kfree(rctrl);
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}
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#ifdef CONFIG_MAC80211_DEBUGFS
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static int open_file_generic(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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static ssize_t sta_tx_avg_rate_sum_read(struct file *file,
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char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct sta_rate_control *srctrl = file->private_data;
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char buf[20];
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sprintf(buf, "%d\n", srctrl->tx_avg_rate_sum);
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return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
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}
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static const struct file_operations sta_tx_avg_rate_sum_ops = {
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.read = sta_tx_avg_rate_sum_read,
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.open = open_file_generic,
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};
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static ssize_t sta_tx_avg_rate_num_read(struct file *file,
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char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct sta_rate_control *srctrl = file->private_data;
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char buf[20];
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sprintf(buf, "%d\n", srctrl->tx_avg_rate_num);
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return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
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}
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static const struct file_operations sta_tx_avg_rate_num_ops = {
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.read = sta_tx_avg_rate_num_read,
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.open = open_file_generic,
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};
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static void rate_control_simple_add_sta_debugfs(void *priv, void *priv_sta,
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struct dentry *dir)
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{
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struct sta_rate_control *srctrl = priv_sta;
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srctrl->tx_avg_rate_num_dentry =
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debugfs_create_file("rc_simple_sta_tx_avg_rate_num", 0400,
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dir, srctrl, &sta_tx_avg_rate_num_ops);
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srctrl->tx_avg_rate_sum_dentry =
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debugfs_create_file("rc_simple_sta_tx_avg_rate_sum", 0400,
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dir, srctrl, &sta_tx_avg_rate_sum_ops);
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}
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static void rate_control_simple_remove_sta_debugfs(void *priv, void *priv_sta)
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{
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struct sta_rate_control *srctrl = priv_sta;
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debugfs_remove(srctrl->tx_avg_rate_sum_dentry);
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debugfs_remove(srctrl->tx_avg_rate_num_dentry);
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}
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#endif
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static struct rate_control_ops mac80211_rcsimple = {
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.name = "simple",
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.tx_status = rate_control_simple_tx_status,
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.get_rate = rate_control_simple_get_rate,
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.rate_init = rate_control_simple_rate_init,
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.clear = rate_control_simple_clear,
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.alloc = rate_control_simple_alloc,
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.free = rate_control_simple_free,
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.alloc_sta = rate_control_simple_alloc_sta,
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.free_sta = rate_control_simple_free_sta,
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#ifdef CONFIG_MAC80211_DEBUGFS
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.add_sta_debugfs = rate_control_simple_add_sta_debugfs,
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.remove_sta_debugfs = rate_control_simple_remove_sta_debugfs,
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#endif
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};
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Simple rate control algorithm");
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int __init rc80211_simple_init(void)
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{
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return ieee80211_rate_control_register(&mac80211_rcsimple);
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}
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void rc80211_simple_exit(void)
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{
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ieee80211_rate_control_unregister(&mac80211_rcsimple);
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}
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#ifdef CONFIG_MAC80211_RC_SIMPLE_MODULE
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module_init(rc80211_simple_init);
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module_exit(rc80211_simple_exit);
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#endif
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