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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 28 Aug 2019 12:13:55 +0200
   3 Subject: [PATCH] cfg80211: add local BSS receive time to survey information
   4
   5 This is useful for checking how much airtime is being used up by other
   6 transmissions on the channel, e.g. by calculating (time_rx - time_bss_rx)
   7 or (time_busy - time_bss_rx - time_tx)
   8
   9 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  10 ---
  11
  12 --- a/include/net/cfg80211.h
  13 +++ b/include/net/cfg80211.h
  14 @@ -668,6 +668,7 @@ ieee80211_chandef_max_power(struct cfg80
  15   * @SURVEY_INFO_TIME_RX: receive time was filled in
  16   * @SURVEY_INFO_TIME_TX: transmit time was filled in
  17   * @SURVEY_INFO_TIME_SCAN: scan time was filled in
  18 + * @SURVEY_INFO_TIME_BSS_RX: local BSS receive time was filled in
  19   *
  20   * Used by the driver to indicate which info in &struct survey_info
  21   * it has filled in during the get_survey().
  22 @@ -681,6 +682,7 @@ enum survey_info_flags {
  23         SURVEY_INFO_TIME_RX             = BIT(5),
  24         SURVEY_INFO_TIME_TX             = BIT(6),
  25         SURVEY_INFO_TIME_SCAN           = BIT(7),
  26 +       SURVEY_INFO_TIME_BSS_RX         = BIT(8),
  27  };
  28
  29  /**
  30 @@ -697,6 +699,7 @@ enum survey_info_flags {
  31   * @time_rx: amount of time the radio spent receiving data
  32   * @time_tx: amount of time the radio spent transmitting data
  33   * @time_scan: amount of time the radio spent for scanning
  34 + * @time_bss_rx: amount of time the radio spent receiving data on a local BSS
  35   *
  36   * Used by dump_survey() to report back per-channel survey information.
  37   *
  38 @@ -711,6 +714,7 @@ struct survey_info {
  39         u64 time_rx;
  40         u64 time_tx;
  41         u64 time_scan;
  42 +       u64 time_bss_rx;
  43         u32 filled;
  44         s8 noise;
  45  };
  46 --- a/include/uapi/linux/nl80211.h
  47 +++ b/include/uapi/linux/nl80211.h
  48 @@ -3693,6 +3693,8 @@ enum nl80211_user_reg_hint_type {
  49   * @NL80211_SURVEY_INFO_TIME_SCAN: time the radio spent for scan
  50   *     (on this channel or globally)
  51   * @NL80211_SURVEY_INFO_PAD: attribute used for padding for 64-bit alignment
  52 + * @NL80211_SURVEY_INFO_TIME_BSS_RX: amount of time the radio spent
  53 + *     receiving local BSS data
  54   * @NL80211_SURVEY_INFO_MAX: highest survey info attribute number
  55   *     currently defined
  56   * @__NL80211_SURVEY_INFO_AFTER_LAST: internal use
  57 @@ -3709,6 +3711,7 @@ enum nl80211_survey_info {
  58         NL80211_SURVEY_INFO_TIME_TX,
  59         NL80211_SURVEY_INFO_TIME_SCAN,
  60         NL80211_SURVEY_INFO_PAD,
  61 +       NL80211_SURVEY_INFO_TIME_BSS_RX,
  62
  63         /* keep last */
  64         __NL80211_SURVEY_INFO_AFTER_LAST,
  65 --- a/net/wireless/nl80211.c
  66 +++ b/net/wireless/nl80211.c
  67 @@ -8379,6 +8379,10 @@ static int nl80211_send_survey(struct sk
  68             nla_put_u64_64bit(msg, NL80211_SURVEY_INFO_TIME_SCAN,
  69                               survey->time_scan, NL80211_SURVEY_INFO_PAD))
  70                 goto nla_put_failure;
  71 +       if ((survey->filled & SURVEY_INFO_TIME_BSS_RX) &&
  72 +           nla_put_u64_64bit(msg, NL80211_SURVEY_INFO_TIME_BSS_RX,
  73 +                             survey->time_bss_rx, NL80211_SURVEY_INFO_PAD))
  74 +               goto nla_put_failure;
  75
  76         nla_nest_end(msg, infoattr);
  77