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