rc80211_minstrel_ht_debugfs.c

Go to the documentation of this file.

/*
 * Copyright (C) 2010 Felix Fietkau <[email protected]>
 *
 * 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);
}