mac80211: add fixed_rate management to minstrel rc

Add the capability to use a fixed modulation rate to minstrel rate controller

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Acked-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c
index 8b5f7ef7c0c9..7fa1b36e6202 100644
--- a/net/mac80211/rc80211_minstrel.c
+++ b/net/mac80211/rc80211_minstrel.c
@@ -203,6 +203,15 @@ minstrel_update_stats(struct minstrel_priv *mp, struct minstrel_sta_info *mi)
         memcpy(mi->max_tp_rate, tmp_tp_rate, sizeof(mi->max_tp_rate));
         mi->max_prob_rate = tmp_prob_rate;
 
+#ifdef CONFIG_MAC80211_DEBUGFS
+        /* use fixed index if set */
+        if (mp->fixed_rate_idx != -1) {
+                mi->max_tp_rate[0] = mp->fixed_rate_idx;
+                mi->max_tp_rate[1] = mp->fixed_rate_idx;
+                mi->max_prob_rate = mp->fixed_rate_idx;
+        }
+#endif
+
         /* Reset update timer */
         mi->stats_update = jiffies;
 
@@ -310,6 +319,11 @@ minstrel_get_rate(void *priv, struct ieee80211_sta *sta,
         /* increase sum packet counter */
         mi->packet_count++;
 
+#ifdef CONFIG_MAC80211_DEBUGFS
+        if (mp->fixed_rate_idx != -1)
+                return;
+#endif
+
         delta = (mi->packet_count * sampling_ratio / 100) -
                         (mi->sample_count + mi->sample_deferred / 2);