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>
Link: https://lore.kernel.org/r/20190828102042.58016-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 5253e7f..ff45c3e 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -768,6 +768,7 @@ ieee80211_chandef_max_power(struct cfg80211_chan_def *chandef)
  * @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().
@@ -781,6 +782,7 @@ 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),
 };
 
 /**
@@ -797,6 +799,7 @@ 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.
  *
@@ -811,6 +814,7 @@ struct survey_info {
        u64 time_rx;
        u64 time_tx;
        u64 time_scan;
+       u64 time_bss_rx;
        u32 filled;
        s8 noise;
 };

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index bf7c422..beee59c 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -3870,6 +3870,8 @@ 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 frames destined to the local BSS
  * @NL80211_SURVEY_INFO_MAX: highest survey info attribute number
  *     currently defined
  * @__NL80211_SURVEY_INFO_AFTER_LAST: internal use
@@ -3886,6 +3888,7 @@ 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,

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 8a6cef9..3e30e18 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -8806,6 +8806,10 @@ static int nl80211_send_survey(struct sk_buff *msg, u32 portid, u32 seq,
            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);