1 files changed, 223 insertions, 0 deletions
diff --git a/net/mac80211/rc80211_pid_debugfs.c b/net/mac80211/rc80211_pid_debugfs.c
new file mode 100644
index 000000000000..88b8dc9999bb
--- /dev/null
+++ b/net/mac80211/rc80211_pid_debugfs.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
+ *
+ * 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/spinlock.h>
+#include <linux/poll.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/skbuff.h>
+
+#include <net/mac80211.h>
+#include "ieee80211_rate.h"
+
+#include "rc80211_pid.h"
+
+static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
+				   enum rc_pid_event_type type,
+				   union rc_pid_event_data *data)
+{
+	struct rc_pid_event *ev;
+	unsigned long status;
+
+	spin_lock_irqsave(&buf->lock, status);
+	ev = &(buf->ring[buf->next_entry]);
+	buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
+
+	ev->timestamp = jiffies;
+	ev->id = buf->ev_count++;
+	ev->type = type;
+	ev->data = *data;
+
+	spin_unlock_irqrestore(&buf->lock, status);
+
+	wake_up_all(&buf->waitqueue);
+}
+
+void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
+					     struct ieee80211_tx_status *stat)
+{
+	union rc_pid_event_data evd;
+
+	memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_status));
+	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
+}
+
+void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
+					       int index, int rate)
+{
+	union rc_pid_event_data evd;
+
+	evd.index = index;
+	evd.rate = rate;
+	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
+}
+
+void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
+					   int index, int rate)
+{
+	union rc_pid_event_data evd;
+
+	evd.index = index;
+	evd.rate = rate;
+	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
+}
+
+void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
+					     s32 pf_sample, s32 prop_err,
+					     s32 int_err, s32 der_err)
+{
+	union rc_pid_event_data evd;
+
+	evd.pf_sample = pf_sample;
+	evd.prop_err = prop_err;
+	evd.int_err = int_err;
+	evd.der_err = der_err;
+	rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
+}
+
+static int rate_control_pid_events_open(struct inode *inode, struct file *file)
+{
+	struct rc_pid_sta_info *sinfo = inode->i_private;
+	struct rc_pid_event_buffer *events = &sinfo->events;
+	struct rc_pid_events_file_info *file_info;
+	unsigned int status;
+
+	/* Allocate a state struct */
+	file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
+	if (file_info == NULL)
+		return -ENOMEM;
+
+	spin_lock_irqsave(&events->lock, status);
+
+	file_info->next_entry = events->next_entry;
+	file_info->events = events;
+
+	spin_unlock_irqrestore(&events->lock, status);
+
+	file->private_data = file_info;
+
+	return 0;
+}
+
+static int rate_control_pid_events_release(struct inode *inode,
+					   struct file *file)
+{
+	struct rc_pid_events_file_info *file_info = file->private_data;
+
+	kfree(file_info);
+
+	return 0;
+}
+
+static unsigned int rate_control_pid_events_poll(struct file *file,
+						 poll_table *wait)
+{
+	struct rc_pid_events_file_info *file_info = file->private_data;
+
+	poll_wait(file, &file_info->events->waitqueue, wait);
+
+	return POLLIN | POLLRDNORM;
+}
+
+#define RC_PID_PRINT_BUF_SIZE 64
+
+static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
+					    size_t length, loff_t *offset)
+{
+	struct rc_pid_events_file_info *file_info = file->private_data;
+	struct rc_pid_event_buffer *events = file_info->events;
+	struct rc_pid_event *ev;
+	char pb[RC_PID_PRINT_BUF_SIZE];
+	int ret;
+	int p;
+	unsigned int status;
+
+	/* Check if there is something to read. */
+	if (events->next_entry == file_info->next_entry) {
+		if (file->f_flags & O_NONBLOCK)
+			return -EAGAIN;
+
+		/* Wait */
+		ret = wait_event_interruptible(events->waitqueue,
+				events->next_entry != file_info->next_entry);
+
+		if (ret)
+			return ret;
+	}
+
+	/* Write out one event per call. I don't care whether it's a little
+	 * inefficient, this is debugging code anyway. */
+	spin_lock_irqsave(&events->lock, status);
+
+	/* Get an event */
+	ev = &(events->ring[file_info->next_entry]);
+	file_info->next_entry = (file_info->next_entry + 1) %
+				RC_PID_EVENT_RING_SIZE;
+
+	/* Print information about the event. Note that userpace needs to
+	 * provide large enough buffers. */
+	length = length < RC_PID_PRINT_BUF_SIZE ?
+		 length : RC_PID_PRINT_BUF_SIZE;
+	p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
+	switch (ev->type) {
+	case RC_PID_EVENT_TYPE_TX_STATUS:
+		p += snprintf(pb + p, length - p, "tx_status %u %u",
+			      ev->data.tx_status.excessive_retries,
+			      ev->data.tx_status.retry_count);
+		break;
+	case RC_PID_EVENT_TYPE_RATE_CHANGE:
+		p += snprintf(pb + p, length - p, "rate_change %d %d",
+			      ev->data.index, ev->data.rate);
+		break;
+	case RC_PID_EVENT_TYPE_TX_RATE:
+		p += snprintf(pb + p, length - p, "tx_rate %d %d",
+			      ev->data.index, ev->data.rate);
+		break;
+	case RC_PID_EVENT_TYPE_PF_SAMPLE:
+		p += snprintf(pb + p, length - p,
+			      "pf_sample %d %d %d %d",
+			      ev->data.pf_sample, ev->data.prop_err,
+			      ev->data.int_err, ev->data.der_err);
+		break;
+	}
+	p += snprintf(pb + p, length - p, "\n");
+
+	spin_unlock_irqrestore(&events->lock, status);
+
+	if (copy_to_user(buf, pb, p))
+		return -EFAULT;
+
+	return p;
+}
+
+#undef RC_PID_PRINT_BUF_SIZE
+
+static 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,
+};
+
+void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
+					     struct dentry *dir)
+{
+	struct rc_pid_sta_info *spinfo = priv_sta;
+
+	spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
+						   dir, spinfo,
+						   &rc_pid_fop_events);
+}
+
+void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
+{
+	struct rc_pid_sta_info *spinfo = priv_sta;
+
+	debugfs_remove(spinfo->events_entry);
+}