mac80211: add debug knobs for fair queuing
This adds a debugfs entry to read and modify some fq parameters. This makes it easy to debug, test and experiment. Signed-off-by: Michal Kazior <michal.kazior@tieto.com> [remove module parameter for now] Signed-off-by: Johannes Berg <johannes.berg@intel.com>hifive-unleashed-5.1
Michal Kazior
Johannes Berg
parent
fa962b9212
commit
9399b86c0e
|
|
@ -10,6 +10,7 @@
|
|||
|
||||
#include <linux/debugfs.h>
|
||||
#include <linux/rtnetlink.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include "ieee80211_i.h"
|
||||
#include "driver-ops.h"
|
||||
#include "rate.h"
|
||||
|
|
@ -70,6 +71,177 @@ DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
|
|||
DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
|
||||
local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");
|
||||
|
||||
struct aqm_info {
|
||||
struct ieee80211_local *local;
|
||||
size_t size;
|
||||
size_t len;
|
||||
unsigned char buf[0];
|
||||
};
|
||||
|
||||
#define AQM_HDR_LEN 200
|
||||
#define AQM_HW_ENTRY_LEN 40
|
||||
#define AQM_TXQ_ENTRY_LEN 110
|
||||
|
||||
static int aqm_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct ieee80211_local *local = inode->i_private;
|
||||
struct ieee80211_sub_if_data *sdata;
|
||||
struct sta_info *sta;
|
||||
struct txq_info *txqi;
|
||||
struct fq *fq = &local->fq;
|
||||
struct aqm_info *info = NULL;
|
||||
int len = 0;
|
||||
int i;
|
||||
|
||||
if (!local->ops->wake_tx_queue)
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
len += AQM_HDR_LEN;
|
||||
len += 6 * AQM_HW_ENTRY_LEN;
|
||||
|
||||
rcu_read_lock();
|
||||
list_for_each_entry_rcu(sdata, &local->interfaces, list)
|
||||
len += AQM_TXQ_ENTRY_LEN;
|
||||
list_for_each_entry_rcu(sta, &local->sta_list, list)
|
||||
len += AQM_TXQ_ENTRY_LEN * ARRAY_SIZE(sta->sta.txq);
|
||||
rcu_read_unlock();
|
||||
|
||||
info = vmalloc(len);
|
||||
if (!info)
|
||||
return -ENOMEM;
|
||||
|
||||
spin_lock_bh(&local->fq.lock);
|
||||
rcu_read_lock();
|
||||
|
||||
file->private_data = info;
|
||||
info->local = local;
|
||||
info->size = len;
|
||||
len = 0;
|
||||
|
||||
len += scnprintf(info->buf + len, info->size - len,
|
||||
"* hw\n"
|
||||
"access name value\n"
|
||||
"R fq_flows_cnt %u\n"
|
||||
"R fq_backlog %u\n"
|
||||
"R fq_overlimit %u\n"
|
||||
"R fq_collisions %u\n"
|
||||
"RW fq_limit %u\n"
|
||||
"RW fq_quantum %u\n",
|
||||
fq->flows_cnt,
|
||||
fq->backlog,
|
||||
fq->overlimit,
|
||||
fq->collisions,
|
||||
fq->limit,
|
||||
fq->quantum);
|
||||
|
||||
len += scnprintf(info->buf + len,
|
||||
info->size - len,
|
||||
"* vif\n"
|
||||
"ifname addr ac backlog-bytes backlog-packets flows overlimit collisions tx-bytes tx-packets\n");
|
||||
|
||||
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
|
||||
txqi = to_txq_info(sdata->vif.txq);
|
||||
len += scnprintf(info->buf + len, info->size - len,
|
||||
"%s %pM %u %u %u %u %u %u %u %u\n",
|
||||
sdata->name,
|
||||
sdata->vif.addr,
|
||||
txqi->txq.ac,
|
||||
txqi->tin.backlog_bytes,
|
||||
txqi->tin.backlog_packets,
|
||||
txqi->tin.flows,
|
||||
txqi->tin.overlimit,
|
||||
txqi->tin.collisions,
|
||||
txqi->tin.tx_bytes,
|
||||
txqi->tin.tx_packets);
|
||||
}
|
||||
|
||||
len += scnprintf(info->buf + len,
|
||||
info->size - len,
|
||||
"* sta\n"
|
||||
"ifname addr tid ac backlog-bytes backlog-packets flows overlimit collisions tx-bytes tx-packets\n");
|
||||
|
||||
list_for_each_entry_rcu(sta, &local->sta_list, list) {
|
||||
sdata = sta->sdata;
|
||||
for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
|
||||
txqi = to_txq_info(sta->sta.txq[i]);
|
||||
len += scnprintf(info->buf + len, info->size - len,
|
||||
"%s %pM %d %d %u %u %u %u %u %u %u\n",
|
||||
sdata->name,
|
||||
sta->sta.addr,
|
||||
txqi->txq.tid,
|
||||
txqi->txq.ac,
|
||||
txqi->tin.backlog_bytes,
|
||||
txqi->tin.backlog_packets,
|
||||
txqi->tin.flows,
|
||||
txqi->tin.overlimit,
|
||||
txqi->tin.collisions,
|
||||
txqi->tin.tx_bytes,
|
||||
txqi->tin.tx_packets);
|
||||
}
|
||||
}
|
||||
|
||||
info->len = len;
|
||||
|
||||
rcu_read_unlock();
|
||||
spin_unlock_bh(&local->fq.lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int aqm_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
vfree(file->private_data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t aqm_read(struct file *file,
|
||||
char __user *user_buf,
|
||||
size_t count,
|
||||
loff_t *ppos)
|
||||
{
|
||||
struct aqm_info *info = file->private_data;
|
||||
|
||||
return simple_read_from_buffer(user_buf, count, ppos,
|
||||
info->buf, info->len);
|
||||
}
|
||||
|
||||
static ssize_t aqm_write(struct file *file,
|
||||
const char __user *user_buf,
|
||||
size_t count,
|
||||
loff_t *ppos)
|
||||
{
|
||||
struct aqm_info *info = file->private_data;
|
||||
struct ieee80211_local *local = info->local;
|
||||
char buf[100];
|
||||
size_t len;
|
||||
|
||||
if (count > sizeof(buf))
|
||||
return -EINVAL;
|
||||
|
||||
if (copy_from_user(buf, user_buf, count))
|
||||
return -EFAULT;
|
||||
|
||||
buf[sizeof(buf) - 1] = '\0';
|
||||
len = strlen(buf);
|
||||
if (len > 0 && buf[len-1] == '\n')
|
||||
buf[len-1] = 0;
|
||||
|
||||
if (sscanf(buf, "fq_limit %u", &local->fq.limit) == 1)
|
||||
return count;
|
||||
else if (sscanf(buf, "fq_quantum %u", &local->fq.quantum) == 1)
|
||||
return count;
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static const struct file_operations aqm_ops = {
|
||||
.write = aqm_write,
|
||||
.read = aqm_read,
|
||||
.open = aqm_open,
|
||||
.release = aqm_release,
|
||||
.llseek = default_llseek,
|
||||
};
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static ssize_t reset_write(struct file *file, const char __user *user_buf,
|
||||
size_t count, loff_t *ppos)
|
||||
|
|
@ -256,6 +428,7 @@ void debugfs_hw_add(struct ieee80211_local *local)
|
|||
DEBUGFS_ADD(hwflags);
|
||||
DEBUGFS_ADD(user_power);
|
||||
DEBUGFS_ADD(power);
|
||||
DEBUGFS_ADD_MODE(aqm, 0600);
|
||||
|
||||
statsd = debugfs_create_dir("statistics", phyd);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue