mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 22:06:47 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12865 3c298f89-4303-0410-b956-a3cf2f4a3e73
929 lines
25 KiB
Diff
929 lines
25 KiB
Diff
--- /dev/null
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+++ b/net/mac80211/rc80211_minstrel.c
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@@ -0,0 +1,583 @@
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+/*
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+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
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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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+ * Based on minstrel.c:
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+ * Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz>
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+ * Sponsored by Indranet Technologies Ltd
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+ *
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+ * Based on sample.c:
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+ * Copyright (c) 2005 John Bicket
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer,
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+ * without modification.
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+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
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+ * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
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+ * redistribution must be conditioned upon including a substantially
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+ * similar Disclaimer requirement for further binary redistribution.
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+ * 3. Neither the names of the above-listed copyright holders nor the names
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+ * of any contributors may be used to endorse or promote products derived
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+ * from this software without specific prior written permission.
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+ *
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+ * Alternatively, this software may be distributed under the terms of the
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+ * GNU General Public License ("GPL") version 2 as published by the Free
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+ * Software Foundation.
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+ *
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+ * NO WARRANTY
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
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+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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+ * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
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+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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+ * THE POSSIBILITY OF SUCH DAMAGES.
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+ */
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+#include <linux/netdevice.h>
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+#include <linux/types.h>
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+#include <linux/skbuff.h>
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+#include <linux/debugfs.h>
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+#include <linux/random.h>
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+#include <linux/ieee80211.h>
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+#include <net/mac80211.h>
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+#include "rate.h"
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+#include "rc80211_minstrel.h"
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+
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+#define SAMPLE_COLUMNS 10
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+#define SAMPLE_TBL(_mi, _idx, _col) \
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+ _mi->sample_table[(_idx * SAMPLE_COLUMNS) + _col]
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+
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+/* convert mac80211 rate index to local array index */
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+static inline int
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+rix_to_ndx(struct minstrel_sta_info *mi, int rix)
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+{
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+ int i = rix;
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+ for (i = rix; i >= 0; i--)
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+ if (mi->r[i].rix == rix)
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+ break;
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+ WARN_ON(mi->r[i].rix != rix);
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+ return i;
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+}
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+
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+static inline bool
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+use_low_rate(struct sk_buff *skb)
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+{
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+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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+ u16 fc;
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+
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+ fc = le16_to_cpu(hdr->frame_control);
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+
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+ return ((info->flags & IEEE80211_TX_CTL_NO_ACK) ||
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+ (fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
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+ is_multicast_ether_addr(hdr->addr1));
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+}
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+
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+
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+static void
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+minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
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+{
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+ u32 max_tp = 0, index_max_tp = 0, index_max_tp2 = 0;
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+ u32 max_prob = 0, index_max_prob = 0;
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+ u32 usecs;
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+ u32 p;
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+ int i;
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+
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+ mi->stats_update = jiffies;
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+ for (i = 0; i < mi->n_rates; i++) {
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+ struct minstrel_rate *mr = &mi->r[i];
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+
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+ usecs = mr->perfect_tx_time;
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+ if (!usecs)
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+ usecs = 1000000;
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+
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+ /* To avoid rounding issues, probabilities scale from 0 (0%)
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+ * to 18000 (100%) */
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+ if (mr->attempts) {
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+ p = (mr->success * 18000) / mr->attempts;
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+ mr->succ_hist += mr->success;
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+ mr->att_hist += mr->attempts;
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+ mr->cur_prob = p;
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+ p = ((p * (100 - mp->ewma_level)) + (mr->probability *
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+ mp->ewma_level)) / 100;
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+ mr->probability = p;
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+ mr->cur_tp = p * (1000000 / usecs);
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+ }
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+
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+ mr->last_success = mr->success;
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+ mr->last_attempts = mr->attempts;
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+ mr->success = 0;
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+ mr->attempts = 0;
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+
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+ /* Sample less often below the 10% chance of success.
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+ * Sample less often above the 95% chance of success. */
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+ if ((mr->probability > 17100) || (mr->probability < 1800)) {
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+ mr->adjusted_retry_count = mr->retry_count >> 1;
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+ if (mr->adjusted_retry_count > 2)
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+ mr->adjusted_retry_count = 2;
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+ } else {
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+ mr->adjusted_retry_count = mr->retry_count;
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+ }
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+ if (!mr->adjusted_retry_count)
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+ mr->adjusted_retry_count = 2;
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+ }
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+
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+ for (i = 0; i < mi->n_rates; i++) {
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+ struct minstrel_rate *mr = &mi->r[i];
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+ if (max_tp < mr->cur_tp) {
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+ index_max_tp = i;
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+ max_tp = mr->cur_tp;
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+ }
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+ if (max_prob < mr->probability) {
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+ index_max_prob = i;
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+ max_prob = mr->probability;
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+ }
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+ }
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+
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+ max_tp = 0;
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+ for (i = 0; i < mi->n_rates; i++) {
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+ struct minstrel_rate *mr = &mi->r[i];
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+
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+ if (i == index_max_tp)
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+ continue;
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+
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+ if (max_tp < mr->cur_tp) {
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+ index_max_tp2 = i;
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+ max_tp = mr->cur_tp;
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+ }
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+ }
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+ mi->max_tp_rate = index_max_tp;
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+ mi->max_tp_rate2 = index_max_tp2;
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+ mi->max_prob_rate = index_max_prob;
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+}
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+
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+static void
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+minstrel_tx_status(void *priv, struct ieee80211_supported_band *sband,
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+ struct ieee80211_sta *sta, void *priv_sta,
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+ struct sk_buff *skb)
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+{
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+ struct minstrel_sta_info *mi = priv_sta;
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+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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+ struct ieee80211_tx_altrate *ar = info->status.retries;
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+ struct minstrel_priv *mp = priv;
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+ int i, ndx, tries;
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+ int success = 0;
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+
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+ if (!info->status.excessive_retries)
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+ success = 1;
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+
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+ if (!mp->has_mrr || (ar[0].rate_idx < 0)) {
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+ ndx = rix_to_ndx(mi, info->tx_rate_idx);
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+ tries = info->status.retry_count + 1;
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+ mi->r[ndx].success += success;
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+ mi->r[ndx].attempts += tries;
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+ return;
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+ }
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+
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+ for (i = 0; i < 4; i++) {
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+ if (ar[i].rate_idx < 0)
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+ break;
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+
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+ ndx = rix_to_ndx(mi, ar[i].rate_idx);
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+ mi->r[ndx].attempts += ar[i].limit + 1;
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+
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+ if ((i != 3) && (ar[i + 1].rate_idx < 0))
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+ mi->r[ndx].success += success;
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+ }
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+
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+ if ((info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) && (i >= 0))
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+ mi->sample_count++;
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+
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+ if (mi->sample_deferred > 0)
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+ mi->sample_deferred--;
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+}
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+
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+
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+static inline unsigned int
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+minstrel_get_retry_count(struct minstrel_rate *mr,
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+ struct ieee80211_tx_info *info)
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+{
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+ unsigned int retry = mr->adjusted_retry_count;
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+
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+ if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
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+ retry = max(2U, min(mr->retry_count_rtscts, retry));
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+ else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT)
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+ retry = max(2U, min(mr->retry_count_cts, retry));
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+ return retry;
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+}
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+
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+
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+static int
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+minstrel_get_next_sample(struct minstrel_sta_info *mi)
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+{
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+ unsigned int sample_ndx;
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+ sample_ndx = SAMPLE_TBL(mi, mi->sample_idx, mi->sample_column);
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+ mi->sample_idx++;
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+ if (mi->sample_idx > (mi->n_rates - 2)) {
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+ mi->sample_idx = 0;
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+ mi->sample_column++;
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+ if (mi->sample_column >= SAMPLE_COLUMNS)
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+ mi->sample_column = 0;
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+ }
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+ return sample_ndx;
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+}
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+
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+void
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+minstrel_get_rate(void *priv, struct ieee80211_supported_band *sband,
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+ struct ieee80211_sta *sta, void *priv_sta,
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+ struct sk_buff *skb, struct rate_selection *sel)
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+{
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+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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+ struct minstrel_sta_info *mi = priv_sta;
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+ struct minstrel_priv *mp = priv;
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+ struct ieee80211_tx_altrate *ar = info->control.retries;
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+ unsigned int ndx, sample_ndx = 0;
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+ bool mrr;
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+ bool sample_slower = false;
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+ bool sample = false;
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+ int i, delta;
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+ int mrr_ndx[3];
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+ int sample_rate;
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+
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+ if (!sta || !mi || use_low_rate(skb)) {
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+ sel->rate_idx = rate_lowest_index(sband, sta);
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+ return;
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+ }
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+
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+ mrr = mp->has_mrr;
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+
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+ /* mac80211 does not allow mrr for RTS/CTS */
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+ if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) ||
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+ (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
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+ mrr = false;
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+
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+ if (time_after(jiffies, mi->stats_update + (mp->update_interval *
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+ HZ) / 1000))
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+ minstrel_update_stats(mp, mi);
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+
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+ ndx = mi->max_tp_rate;
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+
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+ if (mrr)
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+ sample_rate = mp->lookaround_rate_mrr;
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+ else
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+ sample_rate = mp->lookaround_rate;
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+
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+ mi->packet_count++;
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+ delta = (mi->packet_count * sample_rate / 100) -
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+ (mi->sample_count + mi->sample_deferred / 2);
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+
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+ /* delta > 0: sampling required */
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+ if (delta > 0) {
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+ if (mi->packet_count >= 10000) {
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+ mi->sample_deferred = 0;
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+ mi->sample_count = 0;
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+ mi->packet_count = 0;
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+ } else if (delta > mi->n_rates * 2) {
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+ /* With multi-rate retry, not every planned sample
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+ * attempt actually gets used, due to the way the retry
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+ * chain is set up - [max_tp,sample,prob,lowest] for
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+ * sample_rate < max_tp.
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+ *
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+ * If there's too much sampling backlog and the link
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+ * starts getting worse, minstrel would start bursting
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+ * out lots of sampling frames, which would result
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+ * in a large throughput loss. */
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+ mi->sample_count += (delta - mi->n_rates * 2);
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+ }
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+
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+ sample_ndx = minstrel_get_next_sample(mi);
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+ sample = true;
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+ sample_slower = mrr && (mi->r[sample_ndx].perfect_tx_time >
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+ mi->r[ndx].perfect_tx_time);
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+
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+ if (!sample_slower) {
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+ ndx = sample_ndx;
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+ mi->sample_count++;
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+ } else {
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+ /* Only use IEEE80211_TX_CTL_RATE_CTRL_PROBE to mark
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+ * packets that have the sampling rate deferred to the
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+ * second MRR stage. Increase the sample counter only
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+ * if the deferred sample rate was actually used.
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+ * Use the sample_deferred counter to make sure that
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+ * the sampling is not done in large bursts */
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+ info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
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+ mi->sample_deferred++;
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+ }
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+ }
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+ sel->rate_idx = mi->r[ndx].rix;
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+ info->control.retry_limit = minstrel_get_retry_count(&mi->r[ndx], info);
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+
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+ if (!mrr) {
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+ ar[0].rate_idx = mi->lowest_rix;
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+ ar[0].limit = mp->max_retry;
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+ ar[1].rate_idx = -1;
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+ return;
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+ }
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+
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+ /* MRR setup */
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+ if (sample) {
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+ if (sample_slower)
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+ mrr_ndx[0] = sample_ndx;
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+ else
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+ mrr_ndx[0] = mi->max_tp_rate;
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+ } else {
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+ mrr_ndx[0] = mi->max_tp_rate2;
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+ }
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+ mrr_ndx[1] = mi->max_prob_rate;
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+ mrr_ndx[2] = 0;
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+ for (i = 0; i < 3; i++) {
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+ ar[i].rate_idx = mi->r[mrr_ndx[i]].rix;
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+ ar[i].limit = mi->r[mrr_ndx[i]].adjusted_retry_count;
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+ }
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+}
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+
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+
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+static void
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+calc_rate_durations(struct minstrel_sta_info *mi, struct ieee80211_local *local,
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+ struct minstrel_rate *d, struct ieee80211_rate *rate)
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+{
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+ int erp = !!(rate->flags & IEEE80211_RATE_ERP_G);
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+
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+ d->perfect_tx_time = ieee80211_frame_duration(local, 1200,
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+ rate->bitrate, erp, 1);
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+ d->ack_time = ieee80211_frame_duration(local, 10,
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+ rate->bitrate, erp, 1);
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+}
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+
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+static void
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+init_sample_table(struct minstrel_sta_info *mi)
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+{
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+ unsigned int i, col, new_idx;
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+ unsigned int n_srates = mi->n_rates - 1;
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+ u8 rnd[8];
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+
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+ mi->sample_column = 0;
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+ mi->sample_idx = 0;
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+ memset(mi->sample_table, 0, SAMPLE_COLUMNS * mi->n_rates);
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+
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+ for (col = 0; col < SAMPLE_COLUMNS; col++) {
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+ for (i = 0; i < n_srates; i++) {
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+ get_random_bytes(rnd, sizeof(rnd));
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+ new_idx = (i + rnd[i & 7]) % n_srates;
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+
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+ while (SAMPLE_TBL(mi, new_idx, col) != 0)
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+ new_idx = (new_idx + 1) % n_srates;
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+
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+ /* Don't sample the slowest rate (i.e. slowest base
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+ * rate). We must presume that the slowest rate works
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+ * fine, or else other management frames will also be
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+ * failing and the link will break */
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+ SAMPLE_TBL(mi, new_idx, col) = i + 1;
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+ }
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+ }
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+}
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+
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+static void
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+minstrel_rate_init(void *priv, struct ieee80211_supported_band *sband,
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+ struct ieee80211_sta *sta, void *priv_sta)
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+{
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+ struct minstrel_sta_info *mi = priv_sta;
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+ struct minstrel_priv *mp = priv;
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+ struct minstrel_rate *mr_ctl;
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+ unsigned int i, n = 0;
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+ unsigned int t_slot = 9; /* FIXME: get real slot time */
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+
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+ mi->lowest_rix = rate_lowest_index(sband, sta);
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+ mr_ctl = &mi->r[rix_to_ndx(mi, mi->lowest_rix)];
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+ mi->sp_ack_dur = mr_ctl->ack_time;
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+
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+ for (i = 0; i < sband->n_bitrates; i++) {
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+ struct minstrel_rate *mr = &mi->r[n];
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+ unsigned int tx_time = 0, tx_time_cts = 0, tx_time_rtscts = 0;
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+ unsigned int tx_time_single;
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+ unsigned int cw = mp->cw_min;
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+
|
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+ if (!rate_supported(sta, sband->band, i))
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+ continue;
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+ n++;
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+ memset(mr, 0, sizeof(*mr));
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+
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+ mr->rix = i;
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+ mr->bitrate = sband->bitrates[i].bitrate / 5;
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+ calc_rate_durations(mi, hw_to_local(mp->hw), mr,
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+ &sband->bitrates[i]);
|
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+
|
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+ /* calculate maximum number of retransmissions before
|
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+ * fallback (based on maximum segment size) */
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+ mr->retry_count = 1;
|
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+ mr->retry_count_cts = 1;
|
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+ mr->retry_count_rtscts = 1;
|
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+ tx_time = mr->perfect_tx_time + mi->sp_ack_dur;
|
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+ do {
|
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+ /* add one retransmission */
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+ tx_time_single = mr->ack_time + mr->perfect_tx_time;
|
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+
|
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+ /* contention window */
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+ tx_time_single += t_slot + min(cw, mp->cw_max);
|
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+ cw = (cw + 1) << 1;
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+
|
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+ tx_time += tx_time_single;
|
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+ tx_time_cts += tx_time_single + mi->sp_ack_dur;
|
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+ tx_time_rtscts += tx_time_single + 2 * mi->sp_ack_dur;
|
|
+ if ((tx_time_cts < mp->segment_size) &&
|
|
+ (mr->retry_count_cts < mp->max_retry))
|
|
+ mr->retry_count_cts++;
|
|
+ if ((tx_time_rtscts < mp->segment_size) &&
|
|
+ (mr->retry_count_rtscts < mp->max_retry))
|
|
+ mr->retry_count_rtscts++;
|
|
+ } while ((tx_time < mp->segment_size) &&
|
|
+ (++mr->retry_count < mp->max_retry));
|
|
+ mr->adjusted_retry_count = mr->retry_count;
|
|
+ }
|
|
+
|
|
+ for (i = n; i < sband->n_bitrates; i++) {
|
|
+ struct minstrel_rate *mr = &mi->r[i];
|
|
+ mr->rix = -1;
|
|
+ }
|
|
+
|
|
+ mi->n_rates = n;
|
|
+ mi->stats_update = jiffies;
|
|
+
|
|
+ init_sample_table(mi);
|
|
+}
|
|
+
|
|
+static void *
|
|
+minstrel_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp)
|
|
+{
|
|
+ struct ieee80211_supported_band *sband;
|
|
+ struct minstrel_sta_info *mi;
|
|
+ struct minstrel_priv *mp = priv;
|
|
+ struct ieee80211_hw *hw = mp->hw;
|
|
+ int max_rates = 0;
|
|
+ int i;
|
|
+
|
|
+ mi = kzalloc(sizeof(struct minstrel_sta_info), gfp);
|
|
+ if (!mi)
|
|
+ return NULL;
|
|
+
|
|
+ for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
|
|
+ sband = hw->wiphy->bands[hw->conf.channel->band];
|
|
+ if (sband->n_bitrates > max_rates)
|
|
+ max_rates = sband->n_bitrates;
|
|
+ }
|
|
+
|
|
+ mi->r = kzalloc(sizeof(struct minstrel_rate) * max_rates, gfp);
|
|
+ if (!mi->r)
|
|
+ goto error;
|
|
+
|
|
+ mi->sample_table = kmalloc(SAMPLE_COLUMNS * max_rates, gfp);
|
|
+ if (!mi->sample_table)
|
|
+ goto error1;
|
|
+
|
|
+ mi->stats_update = jiffies;
|
|
+ return mi;
|
|
+
|
|
+error1:
|
|
+ kfree(mi->r);
|
|
+error:
|
|
+ kfree(mi);
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
|
|
+{
|
|
+ struct minstrel_sta_info *mi = priv_sta;
|
|
+
|
|
+ kfree(mi->sample_table);
|
|
+ kfree(mi->r);
|
|
+ kfree(mi);
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_clear(void *priv)
|
|
+{
|
|
+}
|
|
+
|
|
+static void *
|
|
+minstrel_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
|
|
+{
|
|
+ struct minstrel_priv *mp;
|
|
+
|
|
+ mp = kzalloc(sizeof(struct minstrel_priv), GFP_ATOMIC);
|
|
+ if (!mp)
|
|
+ return NULL;
|
|
+
|
|
+ /* contention window settings
|
|
+ * Just an approximation. Using the per-queue values would complicate
|
|
+ * the calculations and is probably unnecessary */
|
|
+ mp->cw_min = 15;
|
|
+ mp->cw_max = 1023;
|
|
+
|
|
+ /* number of packets (in %) to use for sampling other rates
|
|
+ * sample less often for non-mrr packets, because the overhead
|
|
+ * is much higher than with mrr */
|
|
+ mp->lookaround_rate = 5;
|
|
+ mp->lookaround_rate_mrr = 10;
|
|
+
|
|
+ /* moving average weight for EWMA */
|
|
+ mp->ewma_level = 75;
|
|
+
|
|
+ /* maximum time that the hw is allowed to stay in one MRR segment */
|
|
+ mp->segment_size = 6000;
|
|
+
|
|
+ if (hw->max_altrate_tries > 0)
|
|
+ mp->max_retry = hw->max_altrate_tries;
|
|
+ else
|
|
+ /* safe default, does not necessarily have to match hw properties */
|
|
+ mp->max_retry = 7;
|
|
+
|
|
+ if (hw->max_altrates >= 3)
|
|
+ mp->has_mrr = true;
|
|
+
|
|
+ mp->hw = hw;
|
|
+ mp->update_interval = 100;
|
|
+
|
|
+ return mp;
|
|
+}
|
|
+
|
|
+static void
|
|
+minstrel_free(void *priv)
|
|
+{
|
|
+ kfree(priv);
|
|
+}
|
|
+
|
|
+static struct rate_control_ops mac80211_minstrel = {
|
|
+ .name = "minstrel",
|
|
+ .tx_status = minstrel_tx_status,
|
|
+ .get_rate = minstrel_get_rate,
|
|
+ .rate_init = minstrel_rate_init,
|
|
+ .clear = minstrel_clear,
|
|
+ .alloc = minstrel_alloc,
|
|
+ .free = minstrel_free,
|
|
+ .alloc_sta = minstrel_alloc_sta,
|
|
+ .free_sta = minstrel_free_sta,
|
|
+#ifdef CONFIG_MAC80211_DEBUGFS
|
|
+ .add_sta_debugfs = minstrel_add_sta_debugfs,
|
|
+ .remove_sta_debugfs = minstrel_remove_sta_debugfs,
|
|
+#endif
|
|
+};
|
|
+
|
|
+int __init
|
|
+rc80211_minstrel_init(void)
|
|
+{
|
|
+ return ieee80211_rate_control_register(&mac80211_minstrel);
|
|
+}
|
|
+
|
|
+void
|
|
+rc80211_minstrel_exit(void)
|
|
+{
|
|
+ ieee80211_rate_control_unregister(&mac80211_minstrel);
|
|
+}
|
|
+
|
|
--- a/net/mac80211/Makefile
|
|
+++ b/net/mac80211/Makefile
|
|
@@ -41,4 +41,8 @@
|
|
rc80211_pid-y := rc80211_pid_algo.o
|
|
rc80211_pid-$(CONFIG_MAC80211_DEBUGFS) += rc80211_pid_debugfs.o
|
|
|
|
+rc80211_minstrel-y := rc80211_minstrel.o
|
|
+rc80211_minstrel-$(CONFIG_MAC80211_DEBUGFS) += rc80211_minstrel_debugfs.o
|
|
+
|
|
mac80211-$(CONFIG_MAC80211_RC_PID) += $(rc80211_pid-y)
|
|
+mac80211-$(CONFIG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
|
|
--- a/net/mac80211/main.c
|
|
+++ b/net/mac80211/main.c
|
|
@@ -1015,6 +1015,10 @@
|
|
BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
|
|
IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
|
|
|
|
+ ret = rc80211_minstrel_init();
|
|
+ if (ret)
|
|
+ return ret;
|
|
+
|
|
ret = rc80211_pid_init();
|
|
if (ret)
|
|
return ret;
|
|
@@ -1027,6 +1031,7 @@
|
|
static void __exit ieee80211_exit(void)
|
|
{
|
|
rc80211_pid_exit();
|
|
+ rc80211_minstrel_exit();
|
|
|
|
/*
|
|
* For key todo, it'll be empty by now but the work
|
|
--- a/net/mac80211/rate.h
|
|
+++ b/net/mac80211/rate.h
|
|
@@ -125,4 +125,18 @@
|
|
}
|
|
#endif
|
|
|
|
+#ifdef CONFIG_MAC80211_RC_MINSTREL
|
|
+extern int rc80211_minstrel_init(void);
|
|
+extern void rc80211_minstrel_exit(void);
|
|
+#else
|
|
+static inline int rc80211_minstrel_init(void)
|
|
+{
|
|
+ return 0;
|
|
+}
|
|
+static inline void rc80211_minstrel_exit(void)
|
|
+{
|
|
+}
|
|
+#endif
|
|
+
|
|
+
|
|
#endif /* IEEE80211_RATE_H */
|
|
--- /dev/null
|
|
+++ b/net/mac80211/rc80211_minstrel.h
|
|
@@ -0,0 +1,85 @@
|
|
+/*
|
|
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
|
|
+ *
|
|
+ * 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.
|
|
+ */
|
|
+
|
|
+#ifndef __RC_MINSTREL_H
|
|
+#define __RC_MINSTREL_H
|
|
+
|
|
+struct minstrel_rate {
|
|
+ int bitrate;
|
|
+ int rix;
|
|
+
|
|
+ unsigned int perfect_tx_time;
|
|
+ unsigned int ack_time;
|
|
+
|
|
+ unsigned int retry_count;
|
|
+ unsigned int retry_count_cts;
|
|
+ unsigned int retry_count_rtscts;
|
|
+ unsigned int adjusted_retry_count;
|
|
+
|
|
+ u32 success;
|
|
+ u32 attempts;
|
|
+ u32 last_attempts;
|
|
+ u32 last_success;
|
|
+
|
|
+ /* parts per thousand */
|
|
+ u32 cur_prob;
|
|
+ u32 probability;
|
|
+
|
|
+ /* per-rate throughput */
|
|
+ u32 cur_tp;
|
|
+ u32 throughput;
|
|
+
|
|
+ u64 succ_hist;
|
|
+ u64 att_hist;
|
|
+};
|
|
+
|
|
+struct minstrel_sta_info {
|
|
+ unsigned long stats_update;
|
|
+ unsigned int sp_ack_dur;
|
|
+ unsigned int rate_avg;
|
|
+
|
|
+ unsigned int lowest_rix;
|
|
+
|
|
+ unsigned int max_tp_rate;
|
|
+ unsigned int max_tp_rate2;
|
|
+ unsigned int max_prob_rate;
|
|
+ unsigned int packet_count;
|
|
+ unsigned int sample_count;
|
|
+ int sample_deferred;
|
|
+
|
|
+ unsigned int sample_idx;
|
|
+ unsigned int sample_column;
|
|
+
|
|
+ int n_rates;
|
|
+ struct minstrel_rate *r;
|
|
+
|
|
+ /* sampling table */
|
|
+ u8 *sample_table;
|
|
+
|
|
+#ifdef CONFIG_MAC80211_DEBUGFS
|
|
+ struct dentry *dbg_stats;
|
|
+#endif
|
|
+};
|
|
+
|
|
+struct minstrel_priv {
|
|
+ struct ieee80211_hw *hw;
|
|
+ bool has_mrr;
|
|
+ unsigned int cw_min;
|
|
+ unsigned int cw_max;
|
|
+ unsigned int max_retry;
|
|
+ unsigned int ewma_level;
|
|
+ unsigned int segment_size;
|
|
+ unsigned int update_interval;
|
|
+ unsigned int lookaround_rate;
|
|
+ unsigned int lookaround_rate_mrr;
|
|
+};
|
|
+
|
|
+void minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
|
|
+void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
|
|
+
|
|
+#endif
|
|
--- /dev/null
|
|
+++ b/net/mac80211/rc80211_minstrel_debugfs.c
|
|
@@ -0,0 +1,164 @@
|
|
+/*
|
|
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
|
|
+ *
|
|
+ * 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.
|
|
+ *
|
|
+ * Based on minstrel.c:
|
|
+ * Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz>
|
|
+ * Sponsored by Indranet Technologies Ltd
|
|
+ *
|
|
+ * Based on sample.c:
|
|
+ * Copyright (c) 2005 John Bicket
|
|
+ * All rights reserved.
|
|
+ *
|
|
+ * Redistribution and use in source and binary forms, with or without
|
|
+ * modification, are permitted provided that the following conditions
|
|
+ * are met:
|
|
+ * 1. Redistributions of source code must retain the above copyright
|
|
+ * notice, this list of conditions and the following disclaimer,
|
|
+ * without modification.
|
|
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
|
|
+ * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
|
|
+ * redistribution must be conditioned upon including a substantially
|
|
+ * similar Disclaimer requirement for further binary redistribution.
|
|
+ * 3. Neither the names of the above-listed copyright holders nor the names
|
|
+ * of any contributors may be used to endorse or promote products derived
|
|
+ * from this software without specific prior written permission.
|
|
+ *
|
|
+ * Alternatively, this software may be distributed under the terms of the
|
|
+ * GNU General Public License ("GPL") version 2 as published by the Free
|
|
+ * Software Foundation.
|
|
+ *
|
|
+ * NO WARRANTY
|
|
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
+ * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
|
|
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
|
+ * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
|
|
+ * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
|
|
+ * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
|
|
+ * THE POSSIBILITY OF SUCH DAMAGES.
|
|
+ */
|
|
+#include <linux/netdevice.h>
|
|
+#include <linux/types.h>
|
|
+#include <linux/skbuff.h>
|
|
+#include <linux/debugfs.h>
|
|
+#include <linux/ieee80211.h>
|
|
+#include <net/mac80211.h>
|
|
+#include "rc80211_minstrel.h"
|
|
+
|
|
+struct minstrel_stats_info {
|
|
+ struct minstrel_sta_info *mi;
|
|
+ char buf[4096];
|
|
+ size_t len;
|
|
+};
|
|
+
|
|
+static int
|
|
+minstrel_stats_open(struct inode *inode, struct file *file)
|
|
+{
|
|
+ struct minstrel_sta_info *mi = inode->i_private;
|
|
+ struct minstrel_stats_info *ms;
|
|
+ unsigned int i, tp, prob, eprob;
|
|
+ char *p;
|
|
+
|
|
+ ms = kmalloc(sizeof(*ms), GFP_KERNEL);
|
|
+ if (!ms)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ file->private_data = ms;
|
|
+ p = ms->buf;
|
|
+ p += sprintf(p, "rate throughput ewma prob this prob "
|
|
+ "this succ/attempt success attempts\n");
|
|
+ for (i = 0; i < mi->n_rates; i++) {
|
|
+ struct minstrel_rate *mr = &mi->r[i];
|
|
+
|
|
+ *(p++) = (i == mi->max_tp_rate) ? 'T' : ' ';
|
|
+ *(p++) = (i == mi->max_tp_rate2) ? 't' : ' ';
|
|
+ *(p++) = (i == mi->max_prob_rate) ? 'P' : ' ';
|
|
+ p += sprintf(p, "%3u%s", mr->bitrate / 2,
|
|
+ (mr->bitrate & 1 ? ".5" : " "));
|
|
+
|
|
+ tp = ((mr->cur_tp * 96) / 18000) >> 10;
|
|
+ prob = mr->cur_prob / 18;
|
|
+ eprob = mr->probability / 18;
|
|
+
|
|
+ p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u "
|
|
+ "%3u(%3u) %8llu %8llu\n",
|
|
+ tp / 10, tp % 10,
|
|
+ eprob / 10, eprob % 10,
|
|
+ prob / 10, prob % 10,
|
|
+ mr->last_success,
|
|
+ mr->last_attempts,
|
|
+ mr->succ_hist,
|
|
+ mr->att_hist);
|
|
+ }
|
|
+ p += sprintf(p, "\nTotal packet count:: ideal %d "
|
|
+ "lookaround %d\n\n",
|
|
+ mi->packet_count - mi->sample_count,
|
|
+ mi->sample_count);
|
|
+ ms->len = p - ms->buf;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static int
|
|
+minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *o)
|
|
+{
|
|
+ struct minstrel_stats_info *ms;
|
|
+ char *src;
|
|
+
|
|
+ ms = file->private_data;
|
|
+ src = ms->buf;
|
|
+
|
|
+ len = min(len, ms->len);
|
|
+ if (len <= *o)
|
|
+ return 0;
|
|
+
|
|
+ src += *o;
|
|
+ len -= *o;
|
|
+ *o += len;
|
|
+
|
|
+ if (copy_to_user(buf, src, len))
|
|
+ return -EFAULT;
|
|
+
|
|
+ return len;
|
|
+}
|
|
+
|
|
+static int
|
|
+minstrel_stats_release(struct inode *inode, struct file *file)
|
|
+{
|
|
+ struct minstrel_stats_info *ms = file->private_data;
|
|
+
|
|
+ kfree(ms);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct file_operations minstrel_stat_fops = {
|
|
+ .owner = THIS_MODULE,
|
|
+ .open = minstrel_stats_open,
|
|
+ .read = minstrel_stats_read,
|
|
+ .release = minstrel_stats_release,
|
|
+};
|
|
+
|
|
+void
|
|
+minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
|
|
+{
|
|
+ struct minstrel_sta_info *mi = priv_sta;
|
|
+
|
|
+ mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
|
|
+ &minstrel_stat_fops);
|
|
+}
|
|
+
|
|
+void
|
|
+minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
|
|
+{
|
|
+ struct minstrel_sta_info *mi = priv_sta;
|
|
+
|
|
+ debugfs_remove(mi->dbg_stats);
|
|
+}
|
|
--- a/net/mac80211/Kconfig
|
|
+++ b/net/mac80211/Kconfig
|
|
@@ -22,6 +22,11 @@
|
|
mac80211 that uses a PID controller to select the TX
|
|
rate.
|
|
|
|
+config MAC80211_RC_MINSTREL
|
|
+ bool "Minstrel"
|
|
+ ---help---
|
|
+ This option enables the 'minstrel' TX rate control algorithm
|
|
+
|
|
choice
|
|
prompt "Default rate control algorithm"
|
|
default MAC80211_RC_DEFAULT_PID
|
|
@@ -39,11 +44,19 @@
|
|
default rate control algorithm. You should choose
|
|
this unless you know what you are doing.
|
|
|
|
+config MAC80211_RC_DEFAULT_MINSTREL
|
|
+ bool "Minstrel"
|
|
+ depends on MAC80211_RC_MINSTREL
|
|
+ ---help---
|
|
+ Select Minstrel as the default rate control algorithm.
|
|
+
|
|
+
|
|
endchoice
|
|
|
|
config MAC80211_RC_DEFAULT
|
|
string
|
|
default "pid" if MAC80211_RC_DEFAULT_PID
|
|
+ default "minstrel" if MAC80211_RC_DEFAULT_MINSTREL
|
|
default ""
|
|
|
|
endmenu
|