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@@ -1,481 +0,0 @@
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-From: Felix Fietkau <[email protected]>
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-Date: Fri, 14 Jun 2019 21:15:47 +0200
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-Subject: [PATCH] mac80211: minstrel_ht: improve rate probing for devices
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- with static fallback
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-
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-On some devices that only support static rate fallback tables sending rate
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-control probing packets can be really expensive.
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-Probing lower rates can already hurt throughput quite a bit. What hurts even
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-more is the fact that on mt76x0/mt76x2, single probing packets can only be
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-forced by directing packets at a different internal hardware queue, which
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-causes some heavy reordering and extra latency.
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-The reordering issue is mainly problematic while pushing lots of packets to
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-a particular station. If there is little activity, the overhead of probing is
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-neglegible.
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-
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-The static fallback behavior is designed to pretty much only handle rate
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-control algorithms that use only a very limited set of rates on which the
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-algorithm switches up/down based on packet error rate.
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-
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-In order to better support that kind of hardware, this patch implements a
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-different approach to rate probing where it switches to a slightly higher rate,
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-waits for tx status feedback, then updates the stats and switches back to
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-the new max throughput rate. This only triggers above a packet rate of 100
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-per stats interval (~50ms).
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-For that kind of probing, the code has to reduce the set of probing rates
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-a lot more compared to single packet probing, so it uses only one packet
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-per MCS group which is either slightly faster, or as close as possible to
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-the max throughput rate.
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-This allows switching between similar rates with different numbers of
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-streams. The algorithm assumes that the hardware will work its way lower
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-within an MCS group in case of retransmissions, so that lower rates don't
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-have to be probed by the high packets per second rate probing code.
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-
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-To further reduce the search space, it also does not probe rates with lower
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-channel bandwidth than the max throughput rate.
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-
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-At the moment, these changes will only affect mt76x0/mt76x2.
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-
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-Signed-off-by: Felix Fietkau <[email protected]>
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----
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-
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---- a/net/mac80211/rc80211_minstrel.h
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-+++ b/net/mac80211/rc80211_minstrel.h
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-@@ -95,6 +95,7 @@ struct minstrel_sta_info {
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- struct minstrel_priv {
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- struct ieee80211_hw *hw;
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- bool has_mrr;
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-+ u32 sample_switch;
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- unsigned int cw_min;
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- unsigned int cw_max;
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- unsigned int max_retry;
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---- a/net/mac80211/rc80211_minstrel_ht.c
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-+++ b/net/mac80211/rc80211_minstrel_ht.c
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-@@ -18,6 +18,8 @@
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- #define AVG_AMPDU_SIZE 16
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- #define AVG_PKT_SIZE 1200
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-
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-+#define SAMPLE_SWITCH_THR 100
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-+
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- /* Number of bits for an average sized packet */
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- #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3)
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-
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-@@ -58,6 +60,7 @@
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- [GROUP_IDX(_streams, _sgi, _ht40)] = { \
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- .streams = _streams, \
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- .shift = _s, \
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-+ .bw = _ht40, \
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- .flags = \
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- IEEE80211_TX_RC_MCS | \
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- (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
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-@@ -94,6 +97,7 @@
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- [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
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- .streams = _streams, \
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- .shift = _s, \
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-+ .bw = _bw, \
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- .flags = \
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- IEEE80211_TX_RC_VHT_MCS | \
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- (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
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-@@ -526,6 +530,133 @@ minstrel_ht_prob_rate_reduce_streams(str
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- }
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- }
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-
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-+static inline int
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-+minstrel_get_duration(int index)
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-+{
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-+ const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
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-+ unsigned int duration = group->duration[index % MCS_GROUP_RATES];
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-+ return duration << group->shift;
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-+}
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-+
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-+static bool
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-+minstrel_ht_probe_group(struct minstrel_ht_sta *mi, const struct mcs_group *tp_group,
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-+ int tp_idx, const struct mcs_group *group)
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-+{
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-+ if (group->bw < tp_group->bw)
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-+ return false;
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-+
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-+ if (group->streams == tp_group->streams)
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-+ return true;
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-+
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-+ if (tp_idx < 4 && group->streams == tp_group->streams - 1)
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-+ return true;
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-+
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-+ return group->streams == tp_group->streams + 1;
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-+}
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-+
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-+static void
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-+minstrel_ht_find_probe_rates(struct minstrel_ht_sta *mi, u16 *rates, int *n_rates,
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-+ bool faster_rate)
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-+{
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-+ const struct mcs_group *group, *tp_group;
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-+ int i, g, max_dur;
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-+ int tp_idx;
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-+
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-+ tp_group = &minstrel_mcs_groups[mi->max_tp_rate[0] / MCS_GROUP_RATES];
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-+ tp_idx = mi->max_tp_rate[0] % MCS_GROUP_RATES;
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-+
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-+ max_dur = minstrel_get_duration(mi->max_tp_rate[0]);
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-+ if (faster_rate)
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-+ max_dur -= max_dur / 16;
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-+
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-+ for (g = 0; g < MINSTREL_GROUPS_NB; g++) {
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-+ u16 supported = mi->supported[g];
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-+
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-+ if (!supported)
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-+ continue;
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-+
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-+ group = &minstrel_mcs_groups[g];
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-+ if (!minstrel_ht_probe_group(mi, tp_group, tp_idx, group))
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-+ continue;
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-+
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-+ for (i = 0; supported; supported >>= 1, i++) {
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-+ int idx;
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-+
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-+ if (!(supported & 1))
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-+ continue;
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-+
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-+ if ((group->duration[i] << group->shift) > max_dur)
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-+ continue;
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-+
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-+ idx = g * MCS_GROUP_RATES + i;
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-+ if (idx == mi->max_tp_rate[0])
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-+ continue;
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-+
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-+ rates[(*n_rates)++] = idx;
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-+ break;
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-+ }
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-+ }
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-+}
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-+
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-+static void
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-+minstrel_ht_rate_sample_switch(struct minstrel_priv *mp,
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-+ struct minstrel_ht_sta *mi)
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-+{
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-+ struct minstrel_rate_stats *mrs;
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-+ u16 rates[MINSTREL_GROUPS_NB];
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-+ int n_rates = 0;
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-+ int probe_rate = 0;
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-+ bool faster_rate;
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-+ int i;
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-+ u8 random;
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-+
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-+ /*
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-+ * Use rate switching instead of probing packets for devices with
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-+ * little control over retry fallback behavior
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-+ */
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-+ if (mp->hw->max_rates > 1)
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-+ return;
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-+
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-+ /*
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-+ * If the current EWMA prob is >75%, look for a rate that's 6.25%
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-+ * faster than the max tp rate.
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-+ * If that fails, look again for a rate that is at least as fast
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-+ */
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-+ mrs = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
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-+ faster_rate = mrs->prob_ewma > MINSTREL_FRAC(75, 100);
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-+ minstrel_ht_find_probe_rates(mi, rates, &n_rates, faster_rate);
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-+ if (!n_rates && faster_rate)
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-+ minstrel_ht_find_probe_rates(mi, rates, &n_rates, false);
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-+
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-+ /* If no suitable rate was found, try to pick the next one in the group */
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-+ if (!n_rates) {
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-+ int g_idx = mi->max_tp_rate[0] / MCS_GROUP_RATES;
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-+ u16 supported = mi->supported[g_idx];
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-+
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-+ supported >>= mi->max_tp_rate[0] % MCS_GROUP_RATES;
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-+ for (i = 0; supported; i++) {
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-+ if (!(supported & 1))
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-+ continue;
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-+
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-+ probe_rate = mi->max_tp_rate[0] + i;
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-+ goto out;
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-+ }
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-+
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-+ return;
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-+ }
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-+
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-+ i = 0;
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-+ if (n_rates > 1) {
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-+ random = prandom_u32();
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-+ i = random % n_rates;
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-+ }
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-+ probe_rate = rates[i];
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-+
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-+out:
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-+ mi->sample_rate = probe_rate;
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-+ mi->sample_mode = MINSTREL_SAMPLE_ACTIVE;
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-+}
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-+
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- /*
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- * Update rate statistics and select new primary rates
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- *
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-@@ -536,7 +667,8 @@ minstrel_ht_prob_rate_reduce_streams(str
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- * higher throughput rates, even if the probablity is a bit lower
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- */
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- static void
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--minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
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-+minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
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-+ bool sample)
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- {
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- struct minstrel_mcs_group_data *mg;
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- struct minstrel_rate_stats *mrs;
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-@@ -544,6 +676,18 @@ minstrel_ht_update_stats(struct minstrel
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- u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES];
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- u16 tmp_cck_tp_rate[MAX_THR_RATES], index;
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-
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-+ mi->sample_mode = MINSTREL_SAMPLE_IDLE;
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-+
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-+ if (sample) {
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-+ mi->total_packets_cur = mi->total_packets -
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-+ mi->total_packets_last;
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-+ mi->total_packets_last = mi->total_packets;
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-+ }
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-+ if (!mp->sample_switch)
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-+ sample = false;
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-+ if (mi->total_packets_cur < SAMPLE_SWITCH_THR && mp->sample_switch != 1)
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-+ sample = false;
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-+
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- if (mi->ampdu_packets > 0) {
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- if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN))
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- mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
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-@@ -630,12 +774,16 @@ minstrel_ht_update_stats(struct minstrel
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- /* try to sample all available rates during each interval */
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- mi->sample_count *= 8;
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-
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-+ if (sample)
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-+ minstrel_ht_rate_sample_switch(mp, mi);
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-+
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- #ifdef CPTCFG_MAC80211_DEBUGFS
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- /* use fixed index if set */
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- if (mp->fixed_rate_idx != -1) {
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- for (i = 0; i < 4; i++)
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- mi->max_tp_rate[i] = mp->fixed_rate_idx;
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- mi->max_prob_rate = mp->fixed_rate_idx;
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-+ mi->sample_mode = MINSTREL_SAMPLE_IDLE;
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- }
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- #endif
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-
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-@@ -739,15 +887,17 @@ minstrel_ht_tx_status(void *priv, struct
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- struct minstrel_ht_sta_priv *msp = priv_sta;
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- struct minstrel_ht_sta *mi = &msp->ht;
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- struct ieee80211_tx_rate *ar = info->status.rates;
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-- struct minstrel_rate_stats *rate, *rate2;
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-+ struct minstrel_rate_stats *rate, *rate2, *rate_sample = NULL;
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- struct minstrel_priv *mp = priv;
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- bool last, update = false;
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-+ bool sample_status = false;
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- int i;
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-
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- if (!msp->is_ht)
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- return mac80211_minstrel.tx_status_ext(priv, sband,
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- &msp->legacy, st);
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-
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-+
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- /* This packet was aggregated but doesn't carry status info */
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- if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
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- !(info->flags & IEEE80211_TX_STAT_AMPDU))
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-@@ -773,12 +923,17 @@ minstrel_ht_tx_status(void *priv, struct
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- if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
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- mi->sample_packets += info->status.ampdu_len;
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-
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-+ if (mi->sample_mode != MINSTREL_SAMPLE_IDLE)
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-+ rate_sample = minstrel_get_ratestats(mi, mi->sample_rate);
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-+
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- last = !minstrel_ht_txstat_valid(mp, &ar[0]);
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- for (i = 0; !last; i++) {
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- last = (i == IEEE80211_TX_MAX_RATES - 1) ||
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- !minstrel_ht_txstat_valid(mp, &ar[i + 1]);
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-
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- rate = minstrel_ht_get_stats(mp, mi, &ar[i]);
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-+ if (rate == rate_sample)
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-+ sample_status = true;
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-
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- if (last)
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- rate->success += info->status.ampdu_ack_len;
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-@@ -786,44 +941,60 @@ minstrel_ht_tx_status(void *priv, struct
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- rate->attempts += ar[i].count * info->status.ampdu_len;
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- }
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-
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-- /*
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-- * check for sudden death of spatial multiplexing,
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-- * downgrade to a lower number of streams if necessary.
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-- */
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-- rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
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-- if (rate->attempts > 30 &&
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-- MINSTREL_FRAC(rate->success, rate->attempts) <
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-- MINSTREL_FRAC(20, 100)) {
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-- minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
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-+ switch (mi->sample_mode) {
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-+ case MINSTREL_SAMPLE_IDLE:
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-+ break;
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-+
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-+ case MINSTREL_SAMPLE_ACTIVE:
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-+ if (!sample_status)
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-+ break;
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-+
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-+ mi->sample_mode = MINSTREL_SAMPLE_PENDING;
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- update = true;
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-- }
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-+ break;
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-+
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-+ case MINSTREL_SAMPLE_PENDING:
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-+ if (sample_status)
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-+ break;
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-
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-- rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
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-- if (rate2->attempts > 30 &&
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-- MINSTREL_FRAC(rate2->success, rate2->attempts) <
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-- MINSTREL_FRAC(20, 100)) {
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-- minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
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- update = true;
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-+ minstrel_ht_update_stats(mp, mi, false);
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-+ break;
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-+ }
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-+
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-+
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-+ if (mp->hw->max_rates > 1) {
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-+ /*
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-+ * check for sudden death of spatial multiplexing,
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-+ * downgrade to a lower number of streams if necessary.
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-+ */
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-+ rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
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-+ if (rate->attempts > 30 &&
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-+ MINSTREL_FRAC(rate->success, rate->attempts) <
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-+ MINSTREL_FRAC(20, 100)) {
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-+ minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
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-+ update = true;
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-+ }
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-+
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-+ rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
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-+ if (rate2->attempts > 30 &&
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-+ MINSTREL_FRAC(rate2->success, rate2->attempts) <
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-+ MINSTREL_FRAC(20, 100)) {
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-+ minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
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-+ update = true;
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-+ }
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- }
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-
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- if (time_after(jiffies, mi->last_stats_update +
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- (mp->update_interval / 2 * HZ) / 1000)) {
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- update = true;
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-- minstrel_ht_update_stats(mp, mi);
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-+ minstrel_ht_update_stats(mp, mi, true);
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- }
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-
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- if (update)
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- minstrel_ht_update_rates(mp, mi);
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- }
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-
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--static inline int
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--minstrel_get_duration(int index)
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--{
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-- const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
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-- unsigned int duration = group->duration[index % MCS_GROUP_RATES];
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-- return duration << group->shift;
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--}
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--
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- static void
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- minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
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- int index)
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-@@ -988,14 +1159,18 @@ static void
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- minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
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- {
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- struct ieee80211_sta_rates *rates;
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-+ u16 first_rate = mi->max_tp_rate[0];
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- int i = 0;
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-
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-+ if (mi->sample_mode == MINSTREL_SAMPLE_ACTIVE)
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-+ first_rate = mi->sample_rate;
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-+
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- rates = kzalloc(sizeof(*rates), GFP_ATOMIC);
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- if (!rates)
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- return;
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-
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- /* Start with max_tp_rate[0] */
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-- minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]);
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-+ minstrel_ht_set_rate(mp, mi, rates, i++, first_rate);
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-
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- if (mp->hw->max_rates >= 3) {
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- /* At least 3 tx rates supported, use max_tp_rate[1] next */
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-@@ -1020,6 +1195,11 @@ minstrel_get_sample_rate(struct minstrel
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- int tp_rate1, tp_rate2;
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- int sample_idx = 0;
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-
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-+ if (mp->hw->max_rates == 1 && mp->sample_switch &&
|
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-+ (mi->total_packets_cur >= SAMPLE_SWITCH_THR ||
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-+ mp->sample_switch == 1))
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-+ return -1;
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-+
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- if (mi->sample_wait > 0) {
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- mi->sample_wait--;
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- return -1;
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-@@ -1341,7 +1521,7 @@ minstrel_ht_update_caps(void *priv, stru
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- mi->supported[MINSTREL_CCK_GROUP] |= mi->cck_supported_short << 4;
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|
-
|
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|
- /* create an initial rate table with the lowest supported rates */
|
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|
-- minstrel_ht_update_stats(mp, mi);
|
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|
-+ minstrel_ht_update_stats(mp, mi, true);
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- minstrel_ht_update_rates(mp, mi);
|
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|
-
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|
- return;
|
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|
-@@ -1459,6 +1639,8 @@ minstrel_ht_alloc(struct ieee80211_hw *h
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|
|
- if (!mp)
|
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|
- return NULL;
|
|
|
-
|
|
|
-+ mp->sample_switch = -1;
|
|
|
-+
|
|
|
- /* contention window settings
|
|
|
- * Just an approximation. Using the per-queue values would complicate
|
|
|
- * the calculations and is probably unnecessary */
|
|
|
-@@ -1490,6 +1672,8 @@ minstrel_ht_alloc(struct ieee80211_hw *h
|
|
|
- mp->fixed_rate_idx = (u32) -1;
|
|
|
- debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
|
|
|
- &mp->fixed_rate_idx);
|
|
|
-+ debugfs_create_u32("sample_switch", S_IRUGO | S_IWUSR, debugfsdir,
|
|
|
-+ &mp->sample_switch);
|
|
|
- #endif
|
|
|
-
|
|
|
- minstrel_ht_init_cck_rates(mp);
|
|
|
---- 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 {
|
|
|
-+ MINSTREL_SAMPLE_IDLE,
|
|
|
-+ MINSTREL_SAMPLE_ACTIVE,
|
|
|
-+ MINSTREL_SAMPLE_PENDING,
|
|
|
-+};
|
|
|
-+
|
|
|
- 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;
|
|
|
-
|