path: root/net/mac80211/rc80211_minstrel_ht.h
diff options
authorFelix Fietkau <>2019-08-20 11:54:49 +0200
committerJohannes Berg <>2019-08-21 11:10:13 +0200
commit48cb39522a9d4d4680865e40a88f975a1cee6abc (patch)
tree619f9198241125039f315670e6728aa985f6eecb /net/mac80211/rc80211_minstrel_ht.h
parent21f7981b4bd904871c6bbd67333cf0f69ff7c06a (diff)
mac80211: minstrel_ht: improve rate probing for devices with static fallback
On some devices that only support static rate fallback tables sending rate control probing packets can be really expensive. Probing lower rates can already hurt throughput quite a bit. What hurts even more is the fact that on mt76x0/mt76x2, single probing packets can only be forced by directing packets at a different internal hardware queue, which causes some heavy reordering and extra latency. The reordering issue is mainly problematic while pushing lots of packets to a particular station. If there is little activity, the overhead of probing is neglegible. The static fallback behavior is designed to pretty much only handle rate control algorithms that use only a very limited set of rates on which the algorithm switches up/down based on packet error rate. In order to better support that kind of hardware, this patch implements a different approach to rate probing where it switches to a slightly higher rate, waits for tx status feedback, then updates the stats and switches back to the new max throughput rate. This only triggers above a packet rate of 100 per stats interval (~50ms). For that kind of probing, the code has to reduce the set of probing rates a lot more compared to single packet probing, so it uses only one packet per MCS group which is either slightly faster, or as close as possible to the max throughput rate. This allows switching between similar rates with different numbers of streams. The algorithm assumes that the hardware will work its way lower within an MCS group in case of retransmissions, so that lower rates don't have to be probed by the high packets per second rate probing code. To further reduce the search space, it also does not probe rates with lower channel bandwidth than the max throughput rate. At the moment, these changes will only affect mt76x0/mt76x2. Signed-off-by: Felix Fietkau <> Link: Signed-off-by: Johannes Berg <>
Diffstat (limited to 'net/mac80211/rc80211_minstrel_ht.h')
1 files changed, 12 insertions, 0 deletions
diff --git a/net/mac80211/rc80211_minstrel_ht.h b/net/mac80211/rc80211_minstrel_ht.h
index 80296268c778..f938701e7ab7 100644
--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -33,6 +33,7 @@ struct mcs_group {
u16 flags;
u8 streams;
u8 shift;
+ u8 bw;
u16 duration[MCS_GROUP_RATES];
@@ -50,6 +51,12 @@ struct minstrel_mcs_group_data {
struct minstrel_rate_stats rates[MCS_GROUP_RATES];
+enum minstrel_sample_mode {
struct minstrel_ht_sta {
struct ieee80211_sta *sta;
@@ -71,6 +78,8 @@ struct minstrel_ht_sta {
unsigned int overhead;
unsigned int overhead_rtscts;
+ unsigned int total_packets_last;
+ unsigned int total_packets_cur;
unsigned int total_packets;
unsigned int sample_packets;
@@ -82,6 +91,9 @@ struct minstrel_ht_sta {
u8 sample_count;
u8 sample_slow;
+ enum minstrel_sample_mode sample_mode;
+ u16 sample_rate;
/* current MCS group to be sampled */
u8 sample_group;