Extend nl80211 to report an exponential weighted moving average (EWMA) of the
signal value. Since the signal value usually fluctuates between different
packets, an average can be more useful than the value of the last packet.
This uses the recently added generic EWMA library function.
--
v2: fix ABI breakage and change factor to be a power of 2.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
* station)
* @NL80211_STA_INFO_TX_RETRIES: total retries (u32, to this station)
* @NL80211_STA_INFO_TX_FAILED: total failed packets (u32, to this station)
* station)
* @NL80211_STA_INFO_TX_RETRIES: total retries (u32, to this station)
* @NL80211_STA_INFO_TX_FAILED: total failed packets (u32, to this station)
+ * @NL80211_STA_INFO_SIGNAL_AVG: signal strength average (u8, dBm)
*/
enum nl80211_sta_info {
__NL80211_STA_INFO_INVALID,
*/
enum nl80211_sta_info {
__NL80211_STA_INFO_INVALID,
NL80211_STA_INFO_TX_PACKETS,
NL80211_STA_INFO_TX_RETRIES,
NL80211_STA_INFO_TX_FAILED,
NL80211_STA_INFO_TX_PACKETS,
NL80211_STA_INFO_TX_RETRIES,
NL80211_STA_INFO_TX_FAILED,
+ NL80211_STA_INFO_SIGNAL_AVG,
/* keep last */
__NL80211_STA_INFO_AFTER_LAST,
/* keep last */
__NL80211_STA_INFO_AFTER_LAST,
* @STATION_INFO_TX_RETRIES: @tx_retries filled
* @STATION_INFO_TX_FAILED: @tx_failed filled
* @STATION_INFO_RX_DROP_MISC: @rx_dropped_misc filled
* @STATION_INFO_TX_RETRIES: @tx_retries filled
* @STATION_INFO_TX_FAILED: @tx_failed filled
* @STATION_INFO_RX_DROP_MISC: @rx_dropped_misc filled
+ * @STATION_INFO_SIGNAL_AVG: @signal_avg filled
*/
enum station_info_flags {
STATION_INFO_INACTIVE_TIME = 1<<0,
*/
enum station_info_flags {
STATION_INFO_INACTIVE_TIME = 1<<0,
STATION_INFO_TX_RETRIES = 1<<10,
STATION_INFO_TX_FAILED = 1<<11,
STATION_INFO_RX_DROP_MISC = 1<<12,
STATION_INFO_TX_RETRIES = 1<<10,
STATION_INFO_TX_FAILED = 1<<11,
STATION_INFO_RX_DROP_MISC = 1<<12,
+ STATION_INFO_SIGNAL_AVG = 1<<13,
* @plid: mesh peer link id
* @plink_state: mesh peer link state
* @signal: signal strength of last received packet in dBm
* @plid: mesh peer link id
* @plink_state: mesh peer link state
* @signal: signal strength of last received packet in dBm
+ * @signal_avg: signal strength average in dBm
* @txrate: current unicast bitrate to this station
* @rx_packets: packets received from this station
* @tx_packets: packets transmitted to this station
* @txrate: current unicast bitrate to this station
* @rx_packets: packets received from this station
* @tx_packets: packets transmitted to this station
u16 plid;
u8 plink_state;
s8 signal;
u16 plid;
u8 plink_state;
s8 signal;
struct rate_info txrate;
u32 rx_packets;
u32 tx_packets;
struct rate_info txrate;
u32 rx_packets;
u32 tx_packets;
select CRYPTO_ARC4
select CRYPTO_AES
select CRC32
select CRYPTO_ARC4
select CRYPTO_AES
select CRC32
---help---
This option enables the hardware independent IEEE 802.11
networking stack.
---help---
This option enables the hardware independent IEEE 802.11
networking stack.
if ((sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) ||
(sta->local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)) {
if ((sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) ||
(sta->local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)) {
- sinfo->filled |= STATION_INFO_SIGNAL;
+ sinfo->filled |= STATION_INFO_SIGNAL | STATION_INFO_SIGNAL_AVG;
sinfo->signal = (s8)sta->last_signal;
sinfo->signal = (s8)sta->last_signal;
+ sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal);
}
sinfo->txrate.flags = 0;
}
sinfo->txrate.flags = 0;
sta->rx_fragments++;
sta->rx_bytes += rx->skb->len;
sta->last_signal = status->signal;
sta->rx_fragments++;
sta->rx_bytes += rx->skb->len;
sta->last_signal = status->signal;
+ ewma_add(&sta->avg_signal, -status->signal);
/*
* Change STA power saving mode only at the end of a frame
/*
* Change STA power saving mode only at the end of a frame
sta->local = local;
sta->sdata = sdata;
sta->local = local;
sta->sdata = sdata;
+ ewma_init(&sta->avg_signal, 1024, 8);
+
if (sta_prepare_rate_control(local, sta, gfp)) {
kfree(sta);
return NULL;
if (sta_prepare_rate_control(local, sta, gfp)) {
kfree(sta);
return NULL;
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/workqueue.h>
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/workqueue.h>
+#include <linux/average.h>
* @rx_fragments: number of received MPDUs
* @rx_dropped: number of dropped MPDUs from this STA
* @last_signal: signal of last received frame from this STA
* @rx_fragments: number of received MPDUs
* @rx_dropped: number of dropped MPDUs from this STA
* @last_signal: signal of last received frame from this STA
+ * @avg_signal: moving average of signal of received frames from this STA
* @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
* @tx_filtered_count: number of frames the hardware filtered for this STA
* @tx_retry_failed: number of frames that failed retry
* @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
* @tx_filtered_count: number of frames the hardware filtered for this STA
* @tx_retry_failed: number of frames that failed retry
unsigned long rx_fragments;
unsigned long rx_dropped;
int last_signal;
unsigned long rx_fragments;
unsigned long rx_dropped;
int last_signal;
+ struct ewma avg_signal;
__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
/* Updated from TX status path only, no locking requirements */
__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
/* Updated from TX status path only, no locking requirements */
if (sinfo->filled & STATION_INFO_SIGNAL)
NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL,
sinfo->signal);
if (sinfo->filled & STATION_INFO_SIGNAL)
NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL,
sinfo->signal);
+ if (sinfo->filled & STATION_INFO_SIGNAL_AVG)
+ NLA_PUT_U8(msg, NL80211_STA_INFO_SIGNAL_AVG,
+ sinfo->signal_avg);
if (sinfo->filled & STATION_INFO_TX_BITRATE) {
txrate = nla_nest_start(msg, NL80211_STA_INFO_TX_BITRATE);
if (!txrate)
if (sinfo->filled & STATION_INFO_TX_BITRATE) {
txrate = nla_nest_start(msg, NL80211_STA_INFO_TX_BITRATE);
if (!txrate)