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![Johannes Berg](/assets/img/avatar_default.png)
So after the previous changes we were still unhappy with how convoluted the API is and decided to make things simpler for everybody. This completely changes the rate control API, now taking into account 802.11n with MCS rates and more control, most drivers don't support that though. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
224 lines
5.8 KiB
C
224 lines
5.8 KiB
C
/*
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* Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/spinlock.h>
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#include <linux/poll.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <net/mac80211.h>
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#include "rate.h"
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#include "rc80211_pid.h"
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static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
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enum rc_pid_event_type type,
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union rc_pid_event_data *data)
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{
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struct rc_pid_event *ev;
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unsigned long status;
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spin_lock_irqsave(&buf->lock, status);
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ev = &(buf->ring[buf->next_entry]);
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buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
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ev->timestamp = jiffies;
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ev->id = buf->ev_count++;
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ev->type = type;
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ev->data = *data;
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spin_unlock_irqrestore(&buf->lock, status);
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wake_up_all(&buf->waitqueue);
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}
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void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
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struct ieee80211_tx_info *stat)
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{
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union rc_pid_event_data evd;
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evd.flags = stat->flags;
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memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_info));
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rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
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}
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void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
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int index, int rate)
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{
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union rc_pid_event_data evd;
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evd.index = index;
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evd.rate = rate;
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rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
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}
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void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
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int index, int rate)
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{
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union rc_pid_event_data evd;
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evd.index = index;
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evd.rate = rate;
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rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
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}
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void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
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s32 pf_sample, s32 prop_err,
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s32 int_err, s32 der_err)
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{
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union rc_pid_event_data evd;
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evd.pf_sample = pf_sample;
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evd.prop_err = prop_err;
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evd.int_err = int_err;
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evd.der_err = der_err;
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rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
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}
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static int rate_control_pid_events_open(struct inode *inode, struct file *file)
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{
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struct rc_pid_sta_info *sinfo = inode->i_private;
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struct rc_pid_event_buffer *events = &sinfo->events;
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struct rc_pid_events_file_info *file_info;
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unsigned long status;
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/* Allocate a state struct */
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file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
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if (file_info == NULL)
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return -ENOMEM;
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spin_lock_irqsave(&events->lock, status);
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file_info->next_entry = events->next_entry;
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file_info->events = events;
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spin_unlock_irqrestore(&events->lock, status);
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file->private_data = file_info;
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return 0;
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}
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static int rate_control_pid_events_release(struct inode *inode,
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struct file *file)
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{
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struct rc_pid_events_file_info *file_info = file->private_data;
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kfree(file_info);
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return 0;
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}
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static unsigned int rate_control_pid_events_poll(struct file *file,
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poll_table *wait)
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{
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struct rc_pid_events_file_info *file_info = file->private_data;
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poll_wait(file, &file_info->events->waitqueue, wait);
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return POLLIN | POLLRDNORM;
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}
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#define RC_PID_PRINT_BUF_SIZE 64
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static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
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size_t length, loff_t *offset)
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{
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struct rc_pid_events_file_info *file_info = file->private_data;
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struct rc_pid_event_buffer *events = file_info->events;
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struct rc_pid_event *ev;
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char pb[RC_PID_PRINT_BUF_SIZE];
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int ret;
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int p;
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unsigned long status;
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/* Check if there is something to read. */
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if (events->next_entry == file_info->next_entry) {
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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/* Wait */
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ret = wait_event_interruptible(events->waitqueue,
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events->next_entry != file_info->next_entry);
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if (ret)
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return ret;
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}
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/* Write out one event per call. I don't care whether it's a little
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* inefficient, this is debugging code anyway. */
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spin_lock_irqsave(&events->lock, status);
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/* Get an event */
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ev = &(events->ring[file_info->next_entry]);
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file_info->next_entry = (file_info->next_entry + 1) %
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RC_PID_EVENT_RING_SIZE;
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/* Print information about the event. Note that userpace needs to
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* provide large enough buffers. */
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length = length < RC_PID_PRINT_BUF_SIZE ?
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length : RC_PID_PRINT_BUF_SIZE;
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p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
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switch (ev->type) {
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case RC_PID_EVENT_TYPE_TX_STATUS:
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p += snprintf(pb + p, length - p, "tx_status %u %u",
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!(ev->data.flags & IEEE80211_TX_STAT_ACK),
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ev->data.tx_status.status.rates[0].idx);
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break;
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case RC_PID_EVENT_TYPE_RATE_CHANGE:
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p += snprintf(pb + p, length - p, "rate_change %d %d",
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ev->data.index, ev->data.rate);
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break;
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case RC_PID_EVENT_TYPE_TX_RATE:
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p += snprintf(pb + p, length - p, "tx_rate %d %d",
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ev->data.index, ev->data.rate);
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break;
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case RC_PID_EVENT_TYPE_PF_SAMPLE:
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p += snprintf(pb + p, length - p,
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"pf_sample %d %d %d %d",
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ev->data.pf_sample, ev->data.prop_err,
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ev->data.int_err, ev->data.der_err);
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break;
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}
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p += snprintf(pb + p, length - p, "\n");
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spin_unlock_irqrestore(&events->lock, status);
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if (copy_to_user(buf, pb, p))
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return -EFAULT;
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return p;
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}
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#undef RC_PID_PRINT_BUF_SIZE
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static struct file_operations rc_pid_fop_events = {
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.owner = THIS_MODULE,
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.read = rate_control_pid_events_read,
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.poll = rate_control_pid_events_poll,
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.open = rate_control_pid_events_open,
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.release = rate_control_pid_events_release,
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};
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void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
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struct dentry *dir)
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{
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struct rc_pid_sta_info *spinfo = priv_sta;
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spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
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dir, spinfo,
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&rc_pid_fop_events);
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}
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void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
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{
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struct rc_pid_sta_info *spinfo = priv_sta;
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debugfs_remove(spinfo->events_entry);
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}
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