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Subject[PATCH v3] mac80211: modify debugfs in PID to monitor rate performance
From Wei YIN <Wei.Yin@nicta.com.au>
addressed v2 comments from Julian and John

Signed-off-by: Wei YIN <Wei.Yin@nicta.com.au>
---
kernel 3.3.0
net/mac80211/rc80211_pid_debugfs.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
1 file changed, 64 insertions(+), 5 deletions(-)

--- wireless-testing_orig/net/mac80211/rc80211_pid_debugfs.c 2012-02-17 13:59:53.487182968 +1000
+++ wireless-testing/net/mac80211/rc80211_pid_debugfs.c 2012-03-17 12:52:48.335192212 +1000
@@ -1,5 +1,6 @@
/*
* Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
+ * Copyright 2012, Wei Yin, National ICT Australia <Wei.Yin@nicta.com.au>
*
* 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
@@ -14,12 +15,73 @@
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/export.h>
+#include <linux/debugfs.h>
+#include <linux/ieee80211.h>
+#include <linux/slab.h>

#include <net/mac80211.h>
#include "rate.h"

#include "rc80211_pid.h"

+
+int
+pid_stats_open(struct inode *inode, struct file *file)
+{
+ struct rc_pid_sta_info *sinfo = inode->i_private;
+ struct rc_pid_debugfs_info *ms;
+ struct rc_pid_rateinfo *rinfo;
+ char *p;
+ int i;
+
+ rinfo = sinfo->rinfo;
+ ms = kmalloc(sizeof(*ms) + 4096, GFP_KERNEL);
+ if (!ms)
+ return -ENOMEM;
+
+ file->private_data = ms;
+ p = ms->buf;
+ p += sprintf(p, "R for current rate; T for temporary rate\n"
+ "rate throughput attempt fail"
+ " success this_FLR\n");
+
+ for (i = 0; i < sinfo->n_rates; i++) {
+ struct rc_pid_rateinfo *pr = &rinfo[i];
+ *(p++) = (i == sinfo->txrate_idx) ? 'R' : ' ';
+ *(p++) = (i == sinfo->tmp_rate_idx) ? 'T' : ' ';
+ p += sprintf(p, "%3u%s", pr->bitrate / 2,
+ (pr->bitrate & 1 ? ".5" : " "));
+ p += sprintf(p,
+ "%6u.%2u %10lu %10lu %10lu %2u%%\n",
+ (pr->throughput * 1530 *8 / 1024 / 1024) /100,
+ (pr->throughput * 1530 *8 / 1024 / 1024) % 100,
+ pr->attempt, pr->fail, pr->success,
+ pr->this_fail == 0 ? 0:
+ (pr->this_fail *100 /
+ pr->this_attempt) % 100);
+ }
+
+ ms->len = p - ms->buf;
+
+ return 0;
+}
+
+ssize_t
+pid_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
+{
+ struct rc_pid_debugfs_info *ms;
+
+ ms = file->private_data;
+ return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
+}
+
+int
+pid_stats_release(struct inode *inode, struct file *file)
+{
+ kfree(file->private_data);
+ return 0;
+}
+
static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
enum rc_pid_event_type type,
union rc_pid_event_data *data)
@@ -203,11 +265,9 @@ static ssize_t rate_control_pid_events_r

static const struct file_operations rc_pid_fop_events = {
.owner = THIS_MODULE,
- .read = rate_control_pid_events_read,
- .poll = rate_control_pid_events_poll,
- .open = rate_control_pid_events_open,
- .release = rate_control_pid_events_release,
- .llseek = noop_llseek,
+ .read = pid_stats_read,
+ .open = pid_stats_open,
+ .release = pid_stats_release,
};

void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,


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