mac80211: add debugfs file for last ack signal

Add a debugfs file showing the signal strength
of the ack frame that is received for the
currently sent tx packet

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

3 files changed, 7 insertions, 0 deletions

diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 89281d24b094..15669415ee98 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -53,6 +53,7 @@ static const struct file_operations sta_ ##name## _ops = {		\
 STA_FILE(aid, sta.aid, D);
 STA_FILE(dev, sdata->name, S);
 STA_FILE(last_signal, last_signal, D);
+STA_FILE(last_ack_signal, last_ack_signal, D);
 
 static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
                               size_t count, loff_t *ppos)
@@ -369,6 +370,7 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
         DEBUGFS_ADD(dev);
         DEBUGFS_ADD(last_signal);
         DEBUGFS_ADD(ht_capa);
+        DEBUGFS_ADD(last_ack_signal);
 
         DEBUGFS_ADD_COUNTER(rx_packets, rx_packets);
         DEBUGFS_ADD_COUNTER(tx_packets, tx_packets);
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 6835cea4e402..dce76939f526 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -250,6 +250,7 @@ struct sta_ampdu_mlme {
  * @rx_dropped: number of dropped MPDUs from this STA
  * @last_signal: signal of last received frame from this STA
  * @avg_signal: moving average of signal of received frames from this STA
+ * @last_ack_signal: signal of last received Ack frame from this STA
  * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
  * @tx_filtered_count: number of frames the hardware filtered for this STA
  * @tx_retry_failed: number of frames that failed retry
@@ -329,6 +330,7 @@ struct sta_info {
         unsigned long rx_dropped;
         int last_signal;
         struct ewma avg_signal;
+        int last_ack_signal;
         /* Plus 1 for non-QoS frames */
         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
 
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 2d931ad0e90a..6400037dd8ec 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -539,6 +539,9 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
                                 sta->lost_packets = 0;
                         }
                 }
+
+                if (acked)
+                        sta->last_ack_signal = info->status.ack_signal;
         }
 
         rcu_read_unlock();