rc80211_minstrel_ht_debugfs.c

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/*
 * 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 <linux/export.h>
#include <net/mac80211.h>
#include "rc80211_minstrel.h"
#include "rc80211_minstrel_ht.h"

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 nonseekable_open(inode, file);
}

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,
        .llseek = no_llseek,
};

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);
}