mac80211: Tx frame latency statistics

Measure TX latency and jitter statistics per station per TID.
These Measurements are disabled by default and can be enabled
via debugfs.

Features included for each station's TID:

1. Keep count of the maximum and average latency of Tx frames.
2. Keep track of many frames arrived in a specific time range
   (need to enable through debugfs and configure the bins ranges)

Signed-off-by: Matti Gottlieb <matti.gottlieb@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 4022ee1afb9..834f0eb3e42 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -898,6 +898,24 @@ struct tpt_led_trigger {
 };
 #endif
 
+/*
+ * struct ieee80211_tx_latency_bin_ranges - Tx latency statistics bins ranges
+ *
+ * Measuring Tx latency statistics. Counts how many Tx frames transmitted in a
+ * certain latency range (in Milliseconds). Each station that uses these
+ * ranges will have bins to count the amount of frames received in that range.
+ * The user can configure the ranges via debugfs.
+ * If ranges is NULL then Tx latency statistics bins are disabled for all
+ * stations.
+ *
+ * @n_ranges: number of ranges that are taken in account
+ * @ranges: the ranges that the user requested or NULL if disabled.
+ */
+struct ieee80211_tx_latency_bin_ranges {
+	int n_ranges;
+	u32 ranges[];
+};
+
 /**
  * mac80211 scan flags - currently active scan mode
  *
@@ -1050,6 +1068,12 @@ struct ieee80211_local {
 	struct timer_list sta_cleanup;
 	int sta_generation;
 
+	/*
+	 * Tx latency statistics parameters for all stations.
+	 * Can enable via debugfs (NULL when disabled).
+	 */
+	struct ieee80211_tx_latency_bin_ranges __rcu *tx_latency;
+
 	struct sk_buff_head pending[IEEE80211_MAX_QUEUES];
 	struct tasklet_struct tx_pending_tasklet;