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From: Felix Fietkau <nbd@nbd.name>
Date: Wed, 28 Aug 2019 12:13:55 +0200
Subject: [PATCH] cfg80211: add local BSS receive time to survey information
This is useful for checking how much airtime is being used up by other
transmissions on the channel, e.g. by calculating (time_rx - time_bss_rx)
or (time_busy - time_bss_rx - time_tx)
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -682,6 +682,7 @@ ieee80211_chandef_max_power(struct cfg80
* @SURVEY_INFO_TIME_RX: receive time was filled in
* @SURVEY_INFO_TIME_TX: transmit time was filled in
* @SURVEY_INFO_TIME_SCAN: scan time was filled in
+ * @SURVEY_INFO_TIME_BSS_RX: local BSS receive time was filled in
*
* Used by the driver to indicate which info in &struct survey_info
* it has filled in during the get_survey().
@@ -695,6 +696,7 @@ enum survey_info_flags {
SURVEY_INFO_TIME_RX = BIT(5),
SURVEY_INFO_TIME_TX = BIT(6),
SURVEY_INFO_TIME_SCAN = BIT(7),
+ SURVEY_INFO_TIME_BSS_RX = BIT(8),
};
/**
@@ -711,6 +713,7 @@ enum survey_info_flags {
* @time_rx: amount of time the radio spent receiving data
* @time_tx: amount of time the radio spent transmitting data
* @time_scan: amount of time the radio spent for scanning
+ * @time_bss_rx: amount of time the radio spent receiving data on a local BSS
*
* Used by dump_survey() to report back per-channel survey information.
*
@@ -725,6 +728,7 @@ struct survey_info {
u64 time_rx;
u64 time_tx;
u64 time_scan;
+ u64 time_bss_rx;
u32 filled;
s8 noise;
};
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -3836,6 +3836,8 @@ enum nl80211_user_reg_hint_type {
* @NL80211_SURVEY_INFO_TIME_SCAN: time the radio spent for scan
* (on this channel or globally)
* @NL80211_SURVEY_INFO_PAD: attribute used for padding for 64-bit alignment
+ * @NL80211_SURVEY_INFO_TIME_BSS_RX: amount of time the radio spent
+ * receiving local BSS data
* @NL80211_SURVEY_INFO_MAX: highest survey info attribute number
* currently defined
* @__NL80211_SURVEY_INFO_AFTER_LAST: internal use
@@ -3852,6 +3854,7 @@ enum nl80211_survey_info {
NL80211_SURVEY_INFO_TIME_TX,
NL80211_SURVEY_INFO_TIME_SCAN,
NL80211_SURVEY_INFO_PAD,
+ NL80211_SURVEY_INFO_TIME_BSS_RX,
/* keep last */
__NL80211_SURVEY_INFO_AFTER_LAST,
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -8694,6 +8694,10 @@ static int nl80211_send_survey(struct sk
nla_put_u64_64bit(msg, NL80211_SURVEY_INFO_TIME_SCAN,
survey->time_scan, NL80211_SURVEY_INFO_PAD))
goto nla_put_failure;
+ if ((survey->filled & SURVEY_INFO_TIME_BSS_RX) &&
+ nla_put_u64_64bit(msg, NL80211_SURVEY_INFO_TIME_BSS_RX,
+ survey->time_bss_rx, NL80211_SURVEY_INFO_PAD))
+ goto nla_put_failure;
nla_nest_end(msg, infoattr);
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