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cfg80211: add channel utilization stats to the survey command 

Using these, user space can calculate a relative channel utilization
with arbitrary intervals by regularly taking snapshots of the survey
results.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2010-10-09 02:39:29 +02:00 committed by John W. Linville
parent 15943a72c7
commit 8610c29a2c
3 changed files with 50 additions and 0 deletions
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15
include/linux/nl80211.h
View File

@ -1413,6 +1413,16 @@ enum nl80211_reg_rule_flags {
* @NL80211_SURVEY_INFO_FREQUENCY: center frequency of channel
* @NL80211_SURVEY_INFO_NOISE: noise level of channel (u8, dBm)
* @NL80211_SURVEY_INFO_IN_USE: channel is currently being used
* @NL80211_SURVEY_INFO_CHANNEL_TIME: amount of time (in ms) that the radio
* spent on this channel
* @NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY: amount of the time the primary
* channel was sensed busy (either due to activity or energy detect)
* @NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY: amount of time the extension
* channel was sensed busy
* @NL80211_SURVEY_INFO_CHANNEL_TIME_RX: amount of time the radio spent
* receiving data
* @NL80211_SURVEY_INFO_CHANNEL_TIME_TX: amount of time the radio spent
* transmitting data
* @NL80211_SURVEY_INFO_MAX: highest survey info attribute number
* currently defined
* @__NL80211_SURVEY_INFO_AFTER_LAST: internal use
@ -1422,6 +1432,11 @@ enum nl80211_survey_info {
NL80211_SURVEY_INFO_FREQUENCY,
NL80211_SURVEY_INFO_NOISE,
NL80211_SURVEY_INFO_IN_USE,
NL80211_SURVEY_INFO_CHANNEL_TIME,
NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY,
NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY,
NL80211_SURVEY_INFO_CHANNEL_TIME_RX,
NL80211_SURVEY_INFO_CHANNEL_TIME_TX,
/* keep last */
__NL80211_SURVEY_INFO_AFTER_LAST,

20
include/net/cfg80211.h
View File

@ -294,6 +294,11 @@ struct key_params {
*
* @SURVEY_INFO_NOISE_DBM: noise (in dBm) was filled in
* @SURVEY_INFO_IN_USE: channel is currently being used
* @SURVEY_INFO_CHANNEL_TIME: channel active time (in ms) was filled in
* @SURVEY_INFO_CHANNEL_TIME_BUSY: channel busy time was filled in
* @SURVEY_INFO_CHANNEL_TIME_EXT_BUSY: extension channel busy time was filled in
* @SURVEY_INFO_CHANNEL_TIME_RX: channel receive time was filled in
* @SURVEY_INFO_CHANNEL_TIME_TX: channel transmit time was filled in
*
* Used by the driver to indicate which info in &struct survey_info
* it has filled in during the get_survey().
@ -301,6 +306,11 @@ struct key_params {
enum survey_info_flags {
SURVEY_INFO_NOISE_DBM = 1<<0,
SURVEY_INFO_IN_USE = 1<<1,
SURVEY_INFO_CHANNEL_TIME = 1<<2,
SURVEY_INFO_CHANNEL_TIME_BUSY = 1<<3,
SURVEY_INFO_CHANNEL_TIME_EXT_BUSY = 1<<4,
SURVEY_INFO_CHANNEL_TIME_RX = 1<<5,
SURVEY_INFO_CHANNEL_TIME_TX = 1<<6,
};
/**
@ -310,6 +320,11 @@ enum survey_info_flags {
* @filled: bitflag of flags from &enum survey_info_flags
* @noise: channel noise in dBm. This and all following fields are
* optional
* @channel_time: amount of time in ms the radio spent on the channel
* @channel_time_busy: amount of time the primary channel was sensed busy
* @channel_time_ext_busy: amount of time the extension channel was sensed busy
* @channel_time_rx: amount of time the radio spent receiving data
* @channel_time_tx: amount of time the radio spent transmitting data
*
* Used by dump_survey() to report back per-channel survey information.
*
@ -318,6 +333,11 @@ enum survey_info_flags {
*/
struct survey_info {
struct ieee80211_channel *channel;
u64 channel_time;
u64 channel_time_busy;
u64 channel_time_ext_busy;
u64 channel_time_rx;
u64 channel_time_tx;
u32 filled;
s8 noise;
};

15
net/wireless/nl80211.c
View File

@ -3153,6 +3153,21 @@ static int nl80211_send_survey(struct sk_buff *msg, u32 pid, u32 seq,
survey->noise);
if (survey->filled & SURVEY_INFO_IN_USE)
NLA_PUT_FLAG(msg, NL80211_SURVEY_INFO_IN_USE);
if (survey->filled & SURVEY_INFO_CHANNEL_TIME)
NLA_PUT_U64(msg, NL80211_SURVEY_INFO_CHANNEL_TIME,
survey->channel_time);
if (survey->filled & SURVEY_INFO_CHANNEL_TIME_BUSY)
NLA_PUT_U64(msg, NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY,
survey->channel_time_busy);
if (survey->filled & SURVEY_INFO_CHANNEL_TIME_EXT_BUSY)
NLA_PUT_U64(msg, NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY,
survey->channel_time_ext_busy);
if (survey->filled & SURVEY_INFO_CHANNEL_TIME_RX)
NLA_PUT_U64(msg, NL80211_SURVEY_INFO_CHANNEL_TIME_RX,
survey->channel_time_rx);
if (survey->filled & SURVEY_INFO_CHANNEL_TIME_TX)
NLA_PUT_U64(msg, NL80211_SURVEY_INFO_CHANNEL_TIME_TX,
survey->channel_time_tx);
nla_nest_end(msg, infoattr);