nl80211: support per-TID station statistics

The base for the current statistics is pretty mixed up, support
exporting RX/TX statistics for MSDUs per TID. This (currently)
covers received MSDUs, transmitted MSDUs and retries/failures
thereof.

Doing it per TID for MSDUs makes more sense than say only per AC
because it's symmetric - we could export per-AC statistics for all
frames (which AC we used for transmission can be determined also
for management frames) but per TID is better and usually data
frames are really the ones we care about. Also, on RX we can't
determine the AC - but we do know the TID for any QoS MPDU we
received.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 95420fb61600..197735788f18 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -939,6 +939,24 @@ struct sta_bss_parameters {
         u16 beacon_interval;
 };
 
+/**
+ * struct cfg80211_tid_stats - per-TID statistics
+ * @filled: bitmap of flags using the bits of &enum nl80211_tid_stats to
+ *      indicate the relevant values in this struct are filled
+ * @rx_msdu: number of received MSDUs
+ * @tx_msdu: number of (attempted) transmitted MSDUs
+ * @tx_msdu_retries: number of retries (not counting the first) for
+ *      transmitted MSDUs
+ * @tx_msdu_failed: number of failed transmitted MSDUs
+ */
+struct cfg80211_tid_stats {
+        u32 filled;
+        u64 rx_msdu;
+        u64 tx_msdu;
+        u64 tx_msdu_retries;
+        u64 tx_msdu_failed;
+};
+
 #define IEEE80211_MAX_CHAINS    4
 
 /**
@@ -990,6 +1008,8 @@ struct sta_bss_parameters {
  * @rx_beacon: number of beacons received from this peer
  * @rx_beacon_signal_avg: signal strength average (in dBm) for beacons received
  *      from this peer
+ * @pertid: per-TID statistics, see &struct cfg80211_tid_stats, using the last
+ *      (IEEE80211_NUM_TIDS) index for MSDUs not encapsulated in QoS-MPDUs.
  */
 struct station_info {
         u32 filled;
@@ -1032,6 +1052,7 @@ struct station_info {
 
         u64 rx_beacon;
         u8 rx_beacon_signal_avg;
+        struct cfg80211_tid_stats pertid[IEEE80211_NUM_TIDS + 1];
 };
 
 /**