mac80211: add debugfs file for current tx rate

Add a debugfs file showing the current tx rate.
The information available in the rc_stats file
doesn't evidently provides us the current tx rate.
This patch adds the support for the same.

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

1 files changed, 16 insertions, 0 deletions

diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 15669415ee98..b6fd9f6ed80c 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -322,6 +322,21 @@ static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
 }
 STA_OPS(ht_capa);
 
+static ssize_t sta_current_tx_rate_read(struct file *file, char __user *userbuf,
+                                        size_t count, loff_t *ppos)
+{
+        struct sta_info *sta = file->private_data;
+        struct rate_info rinfo;
+        u16 rate;
+        sta_set_rate_info_tx(sta, &sta->last_tx_rate, &rinfo);
+        rate = cfg80211_calculate_bitrate(&rinfo);
+
+        return mac80211_format_buffer(userbuf, count, ppos,
+                                      "%d.%d MBit/s\n",
+                                      rate/10, rate%10);
+}
+STA_OPS(current_tx_rate);
+
 #define DEBUGFS_ADD(name) \
         debugfs_create_file(#name, 0400, \
                 sta->debugfs.dir, sta, &sta_ ##name## _ops);
@@ -371,6 +386,7 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
         DEBUGFS_ADD(last_signal);
         DEBUGFS_ADD(ht_capa);
         DEBUGFS_ADD(last_ack_signal);
+        DEBUGFS_ADD(current_tx_rate);
 
         DEBUGFS_ADD_COUNTER(rx_packets, rx_packets);
         DEBUGFS_ADD_COUNTER(tx_packets, tx_packets);