mac80211: add the minstrel_ht rate control algorithm

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 120 insertions, 0 deletions

diff --git a/net/mac80211/rc80211_minstrel_ht_debugfs.c b/net/mac80211/rc80211_minstrel_ht_debugfs.c
new file mode 100644
index 000000000000..4fb3ccbd8b40
--- /dev/null
+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2010 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.
+ */
+#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"
+#include "rc80211_minstrel_ht.h"
+
+extern const struct mcs_group minstrel_mcs_groups[];
+
+static int
+minstrel_ht_stats_open(struct inode *inode, struct file *file)
+{
+        struct minstrel_ht_sta_priv *msp = inode->i_private;
+        struct minstrel_ht_sta *mi = &msp->ht;
+        struct minstrel_debugfs_info *ms;
+        unsigned int i, j, tp, prob, eprob;
+        char *p;
+        int ret;
+
+        if (!msp->is_ht) {
+                inode->i_private = &msp->legacy;
+                ret = minstrel_stats_open(inode, file);
+                inode->i_private = msp;
+                return ret;
+        }
+
+        ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL);
+        if (!ms)
+                return -ENOMEM;
+
+        file->private_data = ms;
+        p = ms->buf;
+        p += sprintf(p, "type      rate     throughput  ewma prob   this prob  "
+                        "this succ/attempt   success    attempts\n");
+        for (i = 0; i < MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; i++) {
+                char htmode = '2';
+                char gimode = 'L';
+
+                if (!mi->groups[i].supported)
+                        continue;
+
+                if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+                        htmode = '4';
+                if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI)
+                        gimode = 'S';
+
+                for (j = 0; j < MCS_GROUP_RATES; j++) {
+                        struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
+                        int idx = i * MCS_GROUP_RATES + j;
+
+                        if (!(mi->groups[i].supported & BIT(j)))
+                                continue;
+
+                        p += sprintf(p, "HT%c0/%cGI ", htmode, gimode);
+
+                        *(p++) = (idx == mi->max_tp_rate) ? 'T' : ' ';
+                        *(p++) = (idx == mi->max_tp_rate2) ? 't' : ' ';
+                        *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
+                        p += sprintf(p, "MCS%-2u", (minstrel_mcs_groups[i].streams - 1) *
+                                        MCS_GROUP_RATES + j);
+
+                        tp = mr->cur_tp / 10;
+                        prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
+                        eprob = MINSTREL_TRUNC(mr->probability * 1000);
+
+                        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,
+                                        (unsigned long long)mr->succ_hist,
+                                        (unsigned long long)mr->att_hist);
+                }
+        }
+        p += sprintf(p, "\nTotal packet count::    ideal %d      "
+                        "lookaround %d\n",
+                        max(0, (int) mi->total_packets - (int) mi->sample_packets),
+                        mi->sample_packets);
+        p += sprintf(p, "Average A-MPDU length: %d.%d\n",
+                MINSTREL_TRUNC(mi->avg_ampdu_len),
+                MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
+        ms->len = p - ms->buf;
+
+        return 0;
+}
+
+static const struct file_operations minstrel_ht_stat_fops = {
+        .owner = THIS_MODULE,
+        .open = minstrel_ht_stats_open,
+        .read = minstrel_stats_read,
+        .release = minstrel_stats_release,
+};
+
+void
+minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
+{
+        struct minstrel_ht_sta_priv *msp = priv_sta;
+
+        msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
+                        &minstrel_ht_stat_fops);
+}
+
+void
+minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
+{
+        struct minstrel_ht_sta_priv *msp = priv_sta;
+
+        debugfs_remove(msp->dbg_stats);
+}