1 /* 2 * Copyright (C) 2010 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 #include <linux/netdevice.h> 9 #include <linux/types.h> 10 #include <linux/skbuff.h> 11 #include <linux/debugfs.h> 12 #include <linux/ieee80211.h> 13 #include <linux/export.h> 14 #include <net/mac80211.h> 15 #include "rc80211_minstrel.h" 16 #include "rc80211_minstrel_ht.h" 17 18 static char * 19 minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p) 20 { 21 unsigned int max_mcs = MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; 22 const struct mcs_group *mg; 23 unsigned int j, tp, prob, eprob; 24 char htmode = '2'; 25 char gimode = 'L'; 26 27 if (!mi->groups[i].supported) 28 return p; 29 30 mg = &minstrel_mcs_groups[i]; 31 if (mg->flags & IEEE80211_TX_RC_40_MHZ_WIDTH) 32 htmode = '4'; 33 if (mg->flags & IEEE80211_TX_RC_SHORT_GI) 34 gimode = 'S'; 35 36 for (j = 0; j < MCS_GROUP_RATES; j++) { 37 struct minstrel_rate_stats *mr = &mi->groups[i].rates[j]; 38 static const int bitrates[4] = { 10, 20, 55, 110 }; 39 int idx = i * MCS_GROUP_RATES + j; 40 41 if (!(mi->groups[i].supported & BIT(j))) 42 continue; 43 44 if (i == max_mcs) 45 p += sprintf(p, "CCK/%cP ", j < 4 ? 'L' : 'S'); 46 else 47 p += sprintf(p, "HT%c0/%cGI ", htmode, gimode); 48 49 *(p++) = (idx == mi->max_tp_rate) ? 'T' : ' '; 50 *(p++) = (idx == mi->max_tp_rate2) ? 't' : ' '; 51 *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' '; 52 53 if (i == max_mcs) { 54 int r = bitrates[j % 4]; 55 p += sprintf(p, " %2u.%1uM", r / 10, r % 10); 56 } else { 57 p += sprintf(p, " MCS%-2u", (mg->streams - 1) * 58 MCS_GROUP_RATES + j); 59 } 60 61 tp = mr->cur_tp / 10; 62 prob = MINSTREL_TRUNC(mr->cur_prob * 1000); 63 eprob = MINSTREL_TRUNC(mr->probability * 1000); 64 65 p += sprintf(p, " %6u.%1u %6u.%1u %6u.%1u " 66 "%3u %3u(%3u) %8llu %8llu\n", 67 tp / 10, tp % 10, 68 eprob / 10, eprob % 10, 69 prob / 10, prob % 10, 70 mr->retry_count, 71 mr->last_success, 72 mr->last_attempts, 73 (unsigned long long)mr->succ_hist, 74 (unsigned long long)mr->att_hist); 75 } 76 77 return p; 78 } 79 80 static int 81 minstrel_ht_stats_open(struct inode *inode, struct file *file) 82 { 83 struct minstrel_ht_sta_priv *msp = inode->i_private; 84 struct minstrel_ht_sta *mi = &msp->ht; 85 struct minstrel_debugfs_info *ms; 86 unsigned int i; 87 unsigned int max_mcs = MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; 88 char *p; 89 int ret; 90 91 if (!msp->is_ht) { 92 inode->i_private = &msp->legacy; 93 ret = minstrel_stats_open(inode, file); 94 inode->i_private = msp; 95 return ret; 96 } 97 98 ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL); 99 if (!ms) 100 return -ENOMEM; 101 102 file->private_data = ms; 103 p = ms->buf; 104 p += sprintf(p, "type rate throughput ewma prob this prob " 105 "retry this succ/attempt success attempts\n"); 106 107 p = minstrel_ht_stats_dump(mi, max_mcs, p); 108 for (i = 0; i < max_mcs; i++) 109 p = minstrel_ht_stats_dump(mi, i, p); 110 111 p += sprintf(p, "\nTotal packet count:: ideal %d " 112 "lookaround %d\n", 113 max(0, (int) mi->total_packets - (int) mi->sample_packets), 114 mi->sample_packets); 115 p += sprintf(p, "Average A-MPDU length: %d.%d\n", 116 MINSTREL_TRUNC(mi->avg_ampdu_len), 117 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10); 118 ms->len = p - ms->buf; 119 120 return nonseekable_open(inode, file); 121 } 122 123 static const struct file_operations minstrel_ht_stat_fops = { 124 .owner = THIS_MODULE, 125 .open = minstrel_ht_stats_open, 126 .read = minstrel_stats_read, 127 .release = minstrel_stats_release, 128 .llseek = no_llseek, 129 }; 130 131 void 132 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir) 133 { 134 struct minstrel_ht_sta_priv *msp = priv_sta; 135 136 msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp, 137 &minstrel_ht_stat_fops); 138 } 139 140 void 141 minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta) 142 { 143 struct minstrel_ht_sta_priv *msp = priv_sta; 144 145 debugfs_remove(msp->dbg_stats); 146 } 147