1/* 2 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org> 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * Based on minstrel.c: 9 * Copyright (C) 2005-2007 Derek Smithies <derek@indranet.co.nz> 10 * Sponsored by Indranet Technologies Ltd 11 * 12 * Based on sample.c: 13 * Copyright (c) 2005 John Bicket 14 * All rights reserved. 15 * 16 * Redistribution and use in source and binary forms, with or without 17 * modification, are permitted provided that the following conditions 18 * are met: 19 * 1. Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer, 21 * without modification. 22 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 23 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 24 * redistribution must be conditioned upon including a substantially 25 * similar Disclaimer requirement for further binary redistribution. 26 * 3. Neither the names of the above-listed copyright holders nor the names 27 * of any contributors may be used to endorse or promote products derived 28 * from this software without specific prior written permission. 29 * 30 * Alternatively, this software may be distributed under the terms of the 31 * GNU General Public License ("GPL") version 2 as published by the Free 32 * Software Foundation. 33 * 34 * NO WARRANTY 35 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 38 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 39 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 40 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 41 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 42 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 43 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 44 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 45 * THE POSSIBILITY OF SUCH DAMAGES. 46 */ 47#include <linux/netdevice.h> 48#include <linux/types.h> 49#include <linux/skbuff.h> 50#include <linux/debugfs.h> 51#include <linux/ieee80211.h> 52#include <linux/slab.h> 53#include <linux/export.h> 54#include <net/mac80211.h> 55#include "rc80211_minstrel.h" 56 57int 58minstrel_stats_open(struct inode *inode, struct file *file) 59{ 60 struct minstrel_sta_info *mi = inode->i_private; 61 struct minstrel_debugfs_info *ms; 62 unsigned int i, tp, prob, eprob; 63 char *p; 64 65 ms = kmalloc(sizeof(*ms) + 4096, GFP_KERNEL); 66 if (!ms) 67 return -ENOMEM; 68 69 file->private_data = ms; 70 p = ms->buf; 71 p += sprintf(p, "rate throughput ewma prob this prob " 72 "this succ/attempt success attempts\n"); 73 for (i = 0; i < mi->n_rates; i++) { 74 struct minstrel_rate *mr = &mi->r[i]; 75 76 *(p++) = (i == mi->max_tp_rate[0]) ? 'A' : ' '; 77 *(p++) = (i == mi->max_tp_rate[1]) ? 'B' : ' '; 78 *(p++) = (i == mi->max_tp_rate[2]) ? 'C' : ' '; 79 *(p++) = (i == mi->max_tp_rate[3]) ? 'D' : ' '; 80 *(p++) = (i == mi->max_prob_rate) ? 'P' : ' '; 81 p += sprintf(p, "%3u%s", mr->bitrate / 2, 82 (mr->bitrate & 1 ? ".5" : " ")); 83 84 tp = MINSTREL_TRUNC(mr->cur_tp / 10); 85 prob = MINSTREL_TRUNC(mr->cur_prob * 1000); 86 eprob = MINSTREL_TRUNC(mr->probability * 1000); 87 88 p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u " 89 " %3u(%3u) %8llu %8llu\n", 90 tp / 10, tp % 10, 91 eprob / 10, eprob % 10, 92 prob / 10, prob % 10, 93 mr->last_success, 94 mr->last_attempts, 95 (unsigned long long)mr->succ_hist, 96 (unsigned long long)mr->att_hist); 97 } 98 p += sprintf(p, "\nTotal packet count:: ideal %d " 99 "lookaround %d\n\n", 100 mi->packet_count - mi->sample_count, 101 mi->sample_count); 102 ms->len = p - ms->buf; 103 104 return 0; 105} 106 107ssize_t 108minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos) 109{ 110 struct minstrel_debugfs_info *ms; 111 112 ms = file->private_data; 113 return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len); 114} 115 116int 117minstrel_stats_release(struct inode *inode, struct file *file) 118{ 119 kfree(file->private_data); 120 return 0; 121} 122 123static const struct file_operations minstrel_stat_fops = { 124 .owner = THIS_MODULE, 125 .open = minstrel_stats_open, 126 .read = minstrel_stats_read, 127 .release = minstrel_stats_release, 128 .llseek = default_llseek, 129}; 130 131void 132minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir) 133{ 134 struct minstrel_sta_info *mi = priv_sta; 135 136 mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi, 137 &minstrel_stat_fops); 138} 139 140void 141minstrel_remove_sta_debugfs(void *priv, void *priv_sta) 142{ 143 struct minstrel_sta_info *mi = priv_sta; 144 145 debugfs_remove(mi->dbg_stats); 146} 147