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/net/mac80211/rc80211_pid_debugfs.c

http://github.com/mirrors/linux
C | 228 lines | 167 code | 46 blank | 15 comment | 9 complexity | eefa2f542a4124a8425de5be60db0d79 MD5 | raw file
  1/*
  2 * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
  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
  9#include <linux/sched.h>
 10#include <linux/spinlock.h>
 11#include <linux/poll.h>
 12#include <linux/netdevice.h>
 13#include <linux/types.h>
 14#include <linux/skbuff.h>
 15#include <linux/slab.h>
 16#include <linux/export.h>
 17
 18#include <net/mac80211.h>
 19#include "rate.h"
 20
 21#include "rc80211_pid.h"
 22
 23static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
 24				   enum rc_pid_event_type type,
 25				   union rc_pid_event_data *data)
 26{
 27	struct rc_pid_event *ev;
 28	unsigned long status;
 29
 30	spin_lock_irqsave(&buf->lock, status);
 31	ev = &(buf->ring[buf->next_entry]);
 32	buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
 33
 34	ev->timestamp = jiffies;
 35	ev->id = buf->ev_count++;
 36	ev->type = type;
 37	ev->data = *data;
 38
 39	spin_unlock_irqrestore(&buf->lock, status);
 40
 41	wake_up_all(&buf->waitqueue);
 42}
 43
 44void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
 45				      struct ieee80211_tx_info *stat)
 46{
 47	union rc_pid_event_data evd;
 48
 49	evd.flags = stat->flags;
 50	memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
 51	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
 52}
 53
 54void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
 55					       int index, int rate)
 56{
 57	union rc_pid_event_data evd;
 58
 59	evd.index = index;
 60	evd.rate = rate;
 61	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
 62}
 63
 64void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
 65					   int index, int rate)
 66{
 67	union rc_pid_event_data evd;
 68
 69	evd.index = index;
 70	evd.rate = rate;
 71	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
 72}
 73
 74void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
 75					     s32 pf_sample, s32 prop_err,
 76					     s32 int_err, s32 der_err)
 77{
 78	union rc_pid_event_data evd;
 79
 80	evd.pf_sample = pf_sample;
 81	evd.prop_err = prop_err;
 82	evd.int_err = int_err;
 83	evd.der_err = der_err;
 84	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
 85}
 86
 87static int rate_control_pid_events_open(struct inode *inode, struct file *file)
 88{
 89	struct rc_pid_sta_info *sinfo = inode->i_private;
 90	struct rc_pid_event_buffer *events = &sinfo->events;
 91	struct rc_pid_events_file_info *file_info;
 92	unsigned long status;
 93
 94	/* Allocate a state struct */
 95	file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
 96	if (file_info == NULL)
 97		return -ENOMEM;
 98
 99	spin_lock_irqsave(&events->lock, status);
100
101	file_info->next_entry = events->next_entry;
102	file_info->events = events;
103
104	spin_unlock_irqrestore(&events->lock, status);
105
106	file->private_data = file_info;
107
108	return 0;
109}
110
111static int rate_control_pid_events_release(struct inode *inode,
112					   struct file *file)
113{
114	struct rc_pid_events_file_info *file_info = file->private_data;
115
116	kfree(file_info);
117
118	return 0;
119}
120
121static unsigned int rate_control_pid_events_poll(struct file *file,
122						 poll_table *wait)
123{
124	struct rc_pid_events_file_info *file_info = file->private_data;
125
126	poll_wait(file, &file_info->events->waitqueue, wait);
127
128	return POLLIN | POLLRDNORM;
129}
130
131#define RC_PID_PRINT_BUF_SIZE 64
132
133static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
134					    size_t length, loff_t *offset)
135{
136	struct rc_pid_events_file_info *file_info = file->private_data;
137	struct rc_pid_event_buffer *events = file_info->events;
138	struct rc_pid_event *ev;
139	char pb[RC_PID_PRINT_BUF_SIZE];
140	int ret;
141	int p;
142	unsigned long status;
143
144	/* Check if there is something to read. */
145	if (events->next_entry == file_info->next_entry) {
146		if (file->f_flags & O_NONBLOCK)
147			return -EAGAIN;
148
149		/* Wait */
150		ret = wait_event_interruptible(events->waitqueue,
151				events->next_entry != file_info->next_entry);
152
153		if (ret)
154			return ret;
155	}
156
157	/* Write out one event per call. I don't care whether it's a little
158	 * inefficient, this is debugging code anyway. */
159	spin_lock_irqsave(&events->lock, status);
160
161	/* Get an event */
162	ev = &(events->ring[file_info->next_entry]);
163	file_info->next_entry = (file_info->next_entry + 1) %
164				RC_PID_EVENT_RING_SIZE;
165
166	/* Print information about the event. Note that userspace needs to
167	 * provide large enough buffers. */
168	length = length < RC_PID_PRINT_BUF_SIZE ?
169		 length : RC_PID_PRINT_BUF_SIZE;
170	p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
171	switch (ev->type) {
172	case RC_PID_EVENT_TYPE_TX_STATUS:
173		p += snprintf(pb + p, length - p, "tx_status %u %u",
174			      !(ev->data.flags & IEEE80211_TX_STAT_ACK),
175			      ev->data.tx_status.status.rates[0].idx);
176		break;
177	case RC_PID_EVENT_TYPE_RATE_CHANGE:
178		p += snprintf(pb + p, length - p, "rate_change %d %d",
179			      ev->data.index, ev->data.rate);
180		break;
181	case RC_PID_EVENT_TYPE_TX_RATE:
182		p += snprintf(pb + p, length - p, "tx_rate %d %d",
183			      ev->data.index, ev->data.rate);
184		break;
185	case RC_PID_EVENT_TYPE_PF_SAMPLE:
186		p += snprintf(pb + p, length - p,
187			      "pf_sample %d %d %d %d",
188			      ev->data.pf_sample, ev->data.prop_err,
189			      ev->data.int_err, ev->data.der_err);
190		break;
191	}
192	p += snprintf(pb + p, length - p, "\n");
193
194	spin_unlock_irqrestore(&events->lock, status);
195
196	if (copy_to_user(buf, pb, p))
197		return -EFAULT;
198
199	return p;
200}
201
202#undef RC_PID_PRINT_BUF_SIZE
203
204static const struct file_operations rc_pid_fop_events = {
205	.owner = THIS_MODULE,
206	.read = rate_control_pid_events_read,
207	.poll = rate_control_pid_events_poll,
208	.open = rate_control_pid_events_open,
209	.release = rate_control_pid_events_release,
210	.llseek = noop_llseek,
211};
212
213void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
214					     struct dentry *dir)
215{
216	struct rc_pid_sta_info *spinfo = priv_sta;
217
218	spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
219						   dir, spinfo,
220						   &rc_pid_fop_events);
221}
222
223void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
224{
225	struct rc_pid_sta_info *spinfo = priv_sta;
226
227	debugfs_remove(spinfo->events_entry);
228}