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linux/net/mac80211/debugfs.c
Monam Agarwal 0c2bef4621 mac80211: use RCU_INIT_POINTER 
rcu_assign_pointer() ensures that the initialization of a structure is
carried out before storing a pointer to that structure. However, in the
case that NULL is assigned there's no structure to initialize so using
RCU_INIT_POINTER instead is safe and more efficient.

Signed-off-by: Monam Agarwal <monamagarwal123@gmail.com>
[squash eight tiny patches, rewrite commit log]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2014-04-09 10:55:30 +02:00

487 lines
15 KiB
C
Raw Blame History

/*
* mac80211 debugfs for wireless PHYs
*
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
*
* GPLv2
*
*/
#include <linux/debugfs.h>
#include <linux/rtnetlink.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#include "debugfs.h"
#define DEBUGFS_FORMAT_BUFFER_SIZE 100
#define TX_LATENCY_BIN_DELIMTER_C ','
#define TX_LATENCY_BIN_DELIMTER_S ","
#define TX_LATENCY_BINS_DISABLED "enable(bins disabled)\n"
#define TX_LATENCY_DISABLED "disable\n"
/*
* Display if Tx latency statistics & bins are enabled/disabled
*/
static ssize_t sta_tx_latency_stat_read(struct file *file,
char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_local *local = file->private_data;
struct ieee80211_tx_latency_bin_ranges *tx_latency;
char *buf;
int bufsz, i, ret;
int pos = 0;
rcu_read_lock();
tx_latency = rcu_dereference(local->tx_latency);
if (tx_latency && tx_latency->n_ranges) {
bufsz = tx_latency->n_ranges * 15;
buf = kzalloc(bufsz, GFP_ATOMIC);
if (!buf)
goto err;
for (i = 0; i < tx_latency->n_ranges; i++)
pos += scnprintf(buf + pos, bufsz - pos, "%d,",
tx_latency->ranges[i]);
pos += scnprintf(buf + pos, bufsz - pos, "\n");
} else if (tx_latency) {
bufsz = sizeof(TX_LATENCY_BINS_DISABLED) + 1;
buf = kzalloc(bufsz, GFP_ATOMIC);
if (!buf)
goto err;
pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
TX_LATENCY_BINS_DISABLED);
} else {
bufsz = sizeof(TX_LATENCY_DISABLED) + 1;
buf = kzalloc(bufsz, GFP_ATOMIC);
if (!buf)
goto err;
pos += scnprintf(buf + pos, bufsz - pos, "%s\n",
TX_LATENCY_DISABLED);
}
rcu_read_unlock();
ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
kfree(buf);
return ret;
err:
rcu_read_unlock();
return -ENOMEM;
}
/*
* Receive input from user regarding Tx latency statistics
* The input should indicate if Tx latency statistics and bins are
* enabled/disabled.
* If bins are enabled input should indicate the amount of different bins and
* their ranges. Each bin will count how many Tx frames transmitted within the
* appropriate latency.
* Legal input is:
* a) "enable(bins disabled)" - to enable only general statistics
* b) "a,b,c,d,...z" - to enable general statistics and bins, where all are
* numbers and a < b < c < d.. < z
* c) "disable" - disable all statistics
* NOTE: must configure Tx latency statistics bins before stations connected.
*/
static ssize_t sta_tx_latency_stat_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ieee80211_local *local = file->private_data;
char buf[128] = {};
char *bins = buf;
char *token;
int buf_size, i, alloc_size;
int prev_bin = 0;
int n_ranges = 0;
int ret = count;
struct ieee80211_tx_latency_bin_ranges *tx_latency;
if (sizeof(buf) <= count)
return -EINVAL;
buf_size = count;
if (copy_from_user(buf, userbuf, buf_size))
return -EFAULT;
mutex_lock(&local->sta_mtx);
/* cannot change config once we have stations */
if (local->num_sta)
goto unlock;
tx_latency =
rcu_dereference_protected(local->tx_latency,
lockdep_is_held(&local->sta_mtx));
/* disable Tx statistics */
if (!strcmp(buf, TX_LATENCY_DISABLED)) {
if (!tx_latency)
goto unlock;
RCU_INIT_POINTER(local->tx_latency, NULL);
synchronize_rcu();
kfree(tx_latency);
goto unlock;
}
/* Tx latency already enabled */
if (tx_latency)
goto unlock;
if (strcmp(TX_LATENCY_BINS_DISABLED, buf)) {
/* check how many bins and between what ranges user requested */
token = buf;
while (*token != '\0') {
if (*token == TX_LATENCY_BIN_DELIMTER_C)
n_ranges++;
token++;
}
n_ranges++;
}
alloc_size = sizeof(struct ieee80211_tx_latency_bin_ranges) +
n_ranges * sizeof(u32);
tx_latency = kzalloc(alloc_size, GFP_ATOMIC);
if (!tx_latency) {
ret = -ENOMEM;
goto unlock;
}
tx_latency->n_ranges = n_ranges;
for (i = 0; i < n_ranges; i++) { /* setting bin ranges */
token = strsep(&bins, TX_LATENCY_BIN_DELIMTER_S);
sscanf(token, "%d", &tx_latency->ranges[i]);
/* bins values should be in ascending order */
if (prev_bin >= tx_latency->ranges[i]) {
ret = -EINVAL;
kfree(tx_latency);
goto unlock;
}
prev_bin = tx_latency->ranges[i];
}
rcu_assign_pointer(local->tx_latency, tx_latency);
unlock:
mutex_unlock(&local->sta_mtx);
return ret;
}
static const struct file_operations stats_tx_latency_ops = {
.write = sta_tx_latency_stat_write,
.read = sta_tx_latency_stat_read,
.open = simple_open,
.llseek = generic_file_llseek,
};
int mac80211_format_buffer(char __user *userbuf, size_t count,
loff_t *ppos, char *fmt, ...)
{
va_list args;
char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
int res;
va_start(args, fmt);
res = vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
return simple_read_from_buffer(userbuf, count, ppos, buf, res);
}
#define DEBUGFS_READONLY_FILE_FN(name, fmt, value...) \
static ssize_t name## _read(struct file *file, char __user *userbuf, \
size_t count, loff_t *ppos) \
{ \
struct ieee80211_local *local = file->private_data; \
\
return mac80211_format_buffer(userbuf, count, ppos, \
fmt "\n", ##value); \
}
#define DEBUGFS_READONLY_FILE_OPS(name) \
static const struct file_operations name## _ops = { \
.read = name## _read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
};
#define DEBUGFS_READONLY_FILE(name, fmt, value...) \
DEBUGFS_READONLY_FILE_FN(name, fmt, value) \
DEBUGFS_READONLY_FILE_OPS(name)
#define DEBUGFS_ADD(name) \
debugfs_create_file(#name, 0400, phyd, local, &name## _ops);
#define DEBUGFS_ADD_MODE(name, mode) \
debugfs_create_file(#name, mode, phyd, local, &name## _ops);
DEBUGFS_READONLY_FILE(user_power, "%d",
local->user_power_level);
DEBUGFS_READONLY_FILE(power, "%d",
local->hw.conf.power_level);
DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
local->total_ps_buffered);
DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
local->wep_iv & 0xffffff);
DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");
#ifdef CONFIG_PM
static ssize_t reset_write(struct file *file, const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ieee80211_local *local = file->private_data;
rtnl_lock();
__ieee80211_suspend(&local->hw, NULL);
__ieee80211_resume(&local->hw);
rtnl_unlock();
return count;
}
static const struct file_operations reset_ops = {
.write = reset_write,
.open = simple_open,
.llseek = noop_llseek,
};
#endif
static ssize_t hwflags_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ieee80211_local *local = file->private_data;
int mxln = 500;
ssize_t rv;
char *buf = kzalloc(mxln, GFP_KERNEL);
int sf = 0; /* how many written so far */
if (!buf)
return 0;
sf += scnprintf(buf, mxln - sf, "0x%x\n", local->hw.flags);
if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
sf += scnprintf(buf + sf, mxln - sf, "HAS_RATE_CONTROL\n");
if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS)
sf += scnprintf(buf + sf, mxln - sf, "RX_INCLUDES_FCS\n");
if (local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)
sf += scnprintf(buf + sf, mxln - sf,
"HOST_BCAST_PS_BUFFERING\n");
if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE)
sf += scnprintf(buf + sf, mxln - sf,
"2GHZ_SHORT_SLOT_INCAPABLE\n");
if (local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE)
sf += scnprintf(buf + sf, mxln - sf,
"2GHZ_SHORT_PREAMBLE_INCAPABLE\n");
if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_UNSPEC\n");
if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
sf += scnprintf(buf + sf, mxln - sf, "SIGNAL_DBM\n");
if (local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC)
sf += scnprintf(buf + sf, mxln - sf,
"NEED_DTIM_BEFORE_ASSOC\n");
if (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT)
sf += scnprintf(buf + sf, mxln - sf, "SPECTRUM_MGMT\n");
if (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION)
sf += scnprintf(buf + sf, mxln - sf, "AMPDU_AGGREGATION\n");
if (local->hw.flags & IEEE80211_HW_SUPPORTS_PS)
sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PS\n");
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
sf += scnprintf(buf + sf, mxln - sf, "PS_NULLFUNC_STACK\n");
if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)
sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_DYNAMIC_PS\n");
if (local->hw.flags & IEEE80211_HW_MFP_CAPABLE)
sf += scnprintf(buf + sf, mxln - sf, "MFP_CAPABLE\n");
if (local->hw.flags & IEEE80211_HW_SUPPORTS_STATIC_SMPS)
sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_STATIC_SMPS\n");
if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
sf += scnprintf(buf + sf, mxln - sf,
"SUPPORTS_DYNAMIC_SMPS\n");
if (local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_UAPSD\n");
if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
sf += scnprintf(buf + sf, mxln - sf,
"REPORTS_TX_ACK_STATUS\n");
if (local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
sf += scnprintf(buf + sf, mxln - sf, "CONNECTION_MONITOR\n");
if (local->hw.flags & IEEE80211_HW_SUPPORTS_PER_STA_GTK)
sf += scnprintf(buf + sf, mxln - sf, "SUPPORTS_PER_STA_GTK\n");
if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
sf += scnprintf(buf + sf, mxln - sf, "AP_LINK_PS\n");
if (local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)
sf += scnprintf(buf + sf, mxln - sf, "TX_AMPDU_SETUP_IN_HW\n");
rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
kfree(buf);
return rv;
}
static ssize_t queues_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct ieee80211_local *local = file->private_data;
unsigned long flags;
char buf[IEEE80211_MAX_QUEUES * 20];
int q, res = 0;
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
for (q = 0; q < local->hw.queues; q++)
res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
local->queue_stop_reasons[q],
skb_queue_len(&local->pending[q]));
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
return simple_read_from_buffer(user_buf, count, ppos, buf, res);
}
DEBUGFS_READONLY_FILE_OPS(hwflags);
DEBUGFS_READONLY_FILE_OPS(queues);
/* statistics stuff */
static ssize_t format_devstat_counter(struct ieee80211_local *local,
char __user *userbuf,
size_t count, loff_t *ppos,
int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
int buflen))
{
struct ieee80211_low_level_stats stats;
char buf[20];
int res;
rtnl_lock();
res = drv_get_stats(local, &stats);
rtnl_unlock();
if (res)
return res;
res = printvalue(&stats, buf, sizeof(buf));
return simple_read_from_buffer(userbuf, count, ppos, buf, res);
}
#define DEBUGFS_DEVSTATS_FILE(name) \
static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
char *buf, int buflen) \
{ \
return scnprintf(buf, buflen, "%u\n", stats->name); \
} \
static ssize_t stats_ ##name## _read(struct file *file, \
char __user *userbuf, \
size_t count, loff_t *ppos) \
{ \
return format_devstat_counter(file->private_data, \
userbuf, \
count, \
ppos, \
print_devstats_##name); \
} \
\
static const struct file_operations stats_ ##name## _ops = { \
.read = stats_ ##name## _read, \
.open = simple_open, \
.llseek = generic_file_llseek, \
};
#define DEBUGFS_STATS_ADD(name, field) \
debugfs_create_u32(#name, 0400, statsd, (u32 *) &field);
#define DEBUGFS_DEVSTATS_ADD(name) \
debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);
DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);
void debugfs_hw_add(struct ieee80211_local *local)
{
struct dentry *phyd = local->hw.wiphy->debugfsdir;
struct dentry *statsd;
if (!phyd)
return;
local->debugfs.keys = debugfs_create_dir("keys", phyd);
DEBUGFS_ADD(total_ps_buffered);
DEBUGFS_ADD(wep_iv);
DEBUGFS_ADD(queues);
#ifdef CONFIG_PM
DEBUGFS_ADD_MODE(reset, 0200);
#endif
DEBUGFS_ADD(hwflags);
DEBUGFS_ADD(user_power);
DEBUGFS_ADD(power);
statsd = debugfs_create_dir("statistics", phyd);
/* if the dir failed, don't put all the other things into the root! */
if (!statsd)
return;
DEBUGFS_STATS_ADD(transmitted_fragment_count,
local->dot11TransmittedFragmentCount);
DEBUGFS_STATS_ADD(multicast_transmitted_frame_count,
local->dot11MulticastTransmittedFrameCount);
DEBUGFS_STATS_ADD(failed_count, local->dot11FailedCount);
DEBUGFS_STATS_ADD(retry_count, local->dot11RetryCount);
DEBUGFS_STATS_ADD(multiple_retry_count,
local->dot11MultipleRetryCount);
DEBUGFS_STATS_ADD(frame_duplicate_count,
local->dot11FrameDuplicateCount);
DEBUGFS_STATS_ADD(received_fragment_count,
local->dot11ReceivedFragmentCount);
DEBUGFS_STATS_ADD(multicast_received_frame_count,
local->dot11MulticastReceivedFrameCount);
DEBUGFS_STATS_ADD(transmitted_frame_count,
local->dot11TransmittedFrameCount);
#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
DEBUGFS_STATS_ADD(tx_handlers_drop, local->tx_handlers_drop);
DEBUGFS_STATS_ADD(tx_handlers_queued, local->tx_handlers_queued);
DEBUGFS_STATS_ADD(tx_handlers_drop_unencrypted,
local->tx_handlers_drop_unencrypted);
DEBUGFS_STATS_ADD(tx_handlers_drop_fragment,
local->tx_handlers_drop_fragment);
DEBUGFS_STATS_ADD(tx_handlers_drop_wep,
local->tx_handlers_drop_wep);
DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc,
local->tx_handlers_drop_not_assoc);
DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port,
local->tx_handlers_drop_unauth_port);
DEBUGFS_STATS_ADD(rx_handlers_drop, local->rx_handlers_drop);
DEBUGFS_STATS_ADD(rx_handlers_queued, local->rx_handlers_queued);
DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc,
local->rx_handlers_drop_nullfunc);
DEBUGFS_STATS_ADD(rx_handlers_drop_defrag,
local->rx_handlers_drop_defrag);
DEBUGFS_STATS_ADD(rx_handlers_drop_short,
local->rx_handlers_drop_short);
DEBUGFS_STATS_ADD(tx_expand_skb_head,
local->tx_expand_skb_head);
DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned,
local->tx_expand_skb_head_cloned);
DEBUGFS_STATS_ADD(rx_expand_skb_head,
local->rx_expand_skb_head);
DEBUGFS_STATS_ADD(rx_expand_skb_head2,
local->rx_expand_skb_head2);
DEBUGFS_STATS_ADD(rx_handlers_fragments,
local->rx_handlers_fragments);
DEBUGFS_STATS_ADD(tx_status_drop,
local->tx_status_drop);
#endif
DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);
DEBUGFS_DEVSTATS_ADD(tx_latency);
}
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