[openwrt/openwrt] mac80211: add AQL improvements
LEDE Commits
lede-commits at lists.infradead.org
Thu Aug 13 11:57:43 EDT 2020
nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/431fb8cae97355109e2496c5921b6d91ce9d510b
commit 431fb8cae97355109e2496c5921b6d91ce9d510b
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Wed Aug 12 17:12:03 2020 +0200
mac80211: add AQL improvements
Add AQL support for HE drivers.
Improve assumed aggregation length based on tx rate
Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
...e-rate-provided-via-status-rate-on-ieee80.patch | 151 +++++++++++++++++
...ctor-out-code-to-look-up-the-average-pack.patch | 186 +++++++++++++++++++++
...prove-AQL-aggregation-estimation-for-low-.patch | 66 ++++++++
3 files changed, 403 insertions(+)
diff --git a/package/kernel/mac80211/patches/subsys/311-mac80211-use-rate-provided-via-status-rate-on-ieee80.patch b/package/kernel/mac80211/patches/subsys/311-mac80211-use-rate-provided-via-status-rate-on-ieee80.patch
new file mode 100644
index 0000000000..ee1db716e0
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/311-mac80211-use-rate-provided-via-status-rate-on-ieee80.patch
@@ -0,0 +1,151 @@
+From: Felix Fietkau <nbd at nbd.name>
+Date: Wed, 12 Aug 2020 17:04:22 +0200
+Subject: [PATCH] mac80211: use rate provided via status->rate on
+ ieee80211_tx_status_ext for AQL
+
+Since ieee80211_tx_info does not have enough room to encode HE rates, HE
+drivers use status->rate to provide rate info.
+Store it in struct sta_info and use it for AQL.
+
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+
+--- a/net/mac80211/airtime.c
++++ b/net/mac80211/airtime.c
+@@ -487,14 +487,61 @@ u32 ieee80211_calc_rx_airtime(struct iee
+ }
+ EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime);
+
++static bool ieee80211_fill_rate_info(struct ieee80211_hw *hw,
++ struct ieee80211_rx_status *stat, u8 band,
++ struct rate_info *ri)
++{
++ struct ieee80211_supported_band *sband = hw->wiphy->bands[band];
++ int i;
++
++ if (!ri || !sband)
++ return false;
++
++ stat->bw = ri->bw;
++ stat->nss = ri->nss;
++ stat->rate_idx = ri->mcs;
++
++ if (ri->flags & RATE_INFO_FLAGS_HE_MCS)
++ stat->encoding = RX_ENC_HE;
++ else if (ri->flags & RATE_INFO_FLAGS_VHT_MCS)
++ stat->encoding = RX_ENC_VHT;
++ else if (ri->flags & RATE_INFO_FLAGS_MCS)
++ stat->encoding = RX_ENC_HT;
++ else
++ stat->encoding = RX_ENC_LEGACY;
++
++ if (ri->flags & RATE_INFO_FLAGS_SHORT_GI)
++ stat->enc_flags |= RX_ENC_FLAG_SHORT_GI;
++
++ stat->he_gi = ri->he_gi;
++
++ if (stat->encoding != RX_ENC_LEGACY)
++ return true;
++
++ stat->rate_idx = 0;
++ for (i = 0; i < sband->n_bitrates; i++) {
++ if (ri->legacy != sband->bitrates[i].bitrate)
++ continue;
++
++ stat->rate_idx = i;
++ return true;
++ }
++
++ return false;
++}
++
+ static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
+ struct ieee80211_tx_rate *rate,
++ struct rate_info *ri,
+ u8 band, int len)
+ {
+ struct ieee80211_rx_status stat = {
+ .band = band,
+ };
+
++ if (ieee80211_fill_rate_info(hw, &stat, band, ri))
++ goto out;
++
+ if (rate->idx < 0 || !rate->count)
+ return 0;
+
+@@ -522,6 +569,7 @@ static u32 ieee80211_calc_tx_airtime_rat
+ stat.encoding = RX_ENC_LEGACY;
+ }
+
++out:
+ return ieee80211_calc_rx_airtime(hw, &stat, len);
+ }
+
+@@ -536,7 +584,7 @@ u32 ieee80211_calc_tx_airtime(struct iee
+ struct ieee80211_tx_rate *rate = &info->status.rates[i];
+ u32 cur_duration;
+
+- cur_duration = ieee80211_calc_tx_airtime_rate(hw, rate,
++ cur_duration = ieee80211_calc_tx_airtime_rate(hw, rate, NULL,
+ info->band, len);
+ if (!cur_duration)
+ break;
+@@ -573,6 +621,7 @@ u32 ieee80211_calc_expected_tx_airtime(s
+ struct sta_info *sta = container_of(pubsta, struct sta_info,
+ sta);
+ struct ieee80211_tx_rate *rate = &sta->tx_stats.last_rate;
++ struct rate_info *ri = &sta->tx_stats.last_rate_info;
+ u32 airtime;
+
+ if (!(rate->flags & (IEEE80211_TX_RC_VHT_MCS |
+@@ -586,7 +635,7 @@ u32 ieee80211_calc_expected_tx_airtime(s
+ * This will not be very accurate, but much better than simply
+ * assuming un-aggregated tx.
+ */
+- airtime = ieee80211_calc_tx_airtime_rate(hw, rate, band,
++ airtime = ieee80211_calc_tx_airtime_rate(hw, rate, ri, band,
+ ampdu ? len * 16 : len);
+ if (ampdu)
+ airtime /= 16;
+--- a/net/mac80211/sta_info.h
++++ b/net/mac80211/sta_info.h
+@@ -609,6 +609,7 @@ struct sta_info {
+ u64 packets[IEEE80211_NUM_ACS];
+ u64 bytes[IEEE80211_NUM_ACS];
+ struct ieee80211_tx_rate last_rate;
++ struct rate_info last_rate_info;
+ u64 msdu[IEEE80211_NUM_TIDS + 1];
+ } tx_stats;
+ u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
+--- a/net/mac80211/status.c
++++ b/net/mac80211/status.c
+@@ -1147,9 +1147,17 @@ void ieee80211_tx_status_ext(struct ieee
+ struct ieee80211_tx_info *info = status->info;
+ struct ieee80211_sta *pubsta = status->sta;
+ struct ieee80211_supported_band *sband;
++ struct sta_info *sta;
+ int retry_count;
+ bool acked, noack_success;
+
++ if (pubsta) {
++ sta = container_of(pubsta, struct sta_info, sta);
++
++ if (status->rate)
++ sta->tx_stats.last_rate_info = *status->rate;
++ }
++
+ if (status->skb)
+ return __ieee80211_tx_status(hw, status);
+
+@@ -1164,10 +1172,6 @@ void ieee80211_tx_status_ext(struct ieee
+ noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
+
+ if (pubsta) {
+- struct sta_info *sta;
+-
+- sta = container_of(pubsta, struct sta_info, sta);
+-
+ if (!acked && !noack_success)
+ sta->status_stats.retry_failed++;
+ sta->status_stats.retry_count += retry_count;
diff --git a/package/kernel/mac80211/patches/subsys/312-mac80211-factor-out-code-to-look-up-the-average-pack.patch b/package/kernel/mac80211/patches/subsys/312-mac80211-factor-out-code-to-look-up-the-average-pack.patch
new file mode 100644
index 0000000000..105bbe2529
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/312-mac80211-factor-out-code-to-look-up-the-average-pack.patch
@@ -0,0 +1,186 @@
+From: Felix Fietkau <nbd at nbd.name>
+Date: Wed, 12 Aug 2020 17:06:12 +0200
+Subject: [PATCH] mac80211: factor out code to look up the average packet
+ length duration for a rate
+
+This will be used to enhance AQL estimated aggregation length
+
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+
+--- a/net/mac80211/airtime.c
++++ b/net/mac80211/airtime.c
+@@ -405,18 +405,14 @@ ieee80211_calc_legacy_rate_duration(u16
+ return duration;
+ }
+
+-u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
+- struct ieee80211_rx_status *status,
+- int len)
++static u32 ieee80211_get_rate_duration(struct ieee80211_hw *hw,
++ struct ieee80211_rx_status *status,
++ u32 *overhead)
+ {
+- struct ieee80211_supported_band *sband;
+- const struct ieee80211_rate *rate;
+ bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI;
+- bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
+ int bw, streams;
+ int group, idx;
+ u32 duration;
+- bool cck;
+
+ switch (status->bw) {
+ case RATE_INFO_BW_20:
+@@ -437,20 +433,6 @@ u32 ieee80211_calc_rx_airtime(struct iee
+ }
+
+ switch (status->encoding) {
+- case RX_ENC_LEGACY:
+- if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ))
+- return 0;
+-
+- sband = hw->wiphy->bands[status->band];
+- if (!sband || status->rate_idx >= sband->n_bitrates)
+- return 0;
+-
+- rate = &sband->bitrates[status->rate_idx];
+- cck = rate->flags & IEEE80211_RATE_MANDATORY_B;
+-
+- return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp,
+- cck, len);
+-
+ case RX_ENC_VHT:
+ streams = status->nss;
+ idx = status->rate_idx;
+@@ -477,13 +459,47 @@ u32 ieee80211_calc_rx_airtime(struct iee
+
+ duration = airtime_mcs_groups[group].duration[idx];
+ duration <<= airtime_mcs_groups[group].shift;
++ *overhead = 36 + (streams << 2);
++
++ return duration;
++}
++
++
++u32 ieee80211_calc_rx_airtime(struct ieee80211_hw *hw,
++ struct ieee80211_rx_status *status,
++ int len)
++{
++ struct ieee80211_supported_band *sband;
++ u32 duration, overhead = 0;
++
++ if (status->encoding == RX_ENC_LEGACY) {
++ const struct ieee80211_rate *rate;
++ bool sp = status->enc_flags & RX_ENC_FLAG_SHORTPRE;
++ bool cck;
++
++ if (WARN_ON_ONCE(status->band > NL80211_BAND_5GHZ))
++ return 0;
++
++ sband = hw->wiphy->bands[status->band];
++ if (!sband || status->rate_idx >= sband->n_bitrates)
++ return 0;
++
++ rate = &sband->bitrates[status->rate_idx];
++ cck = rate->flags & IEEE80211_RATE_MANDATORY_B;
++
++ return ieee80211_calc_legacy_rate_duration(rate->bitrate, sp,
++ cck, len);
++ }
++
++ duration = ieee80211_get_rate_duration(hw, status, &overhead);
++ if (!duration)
++ return 0;
++
+ duration *= len;
+ duration /= AVG_PKT_SIZE;
+ duration /= 1024;
+
+- duration += 36 + (streams << 2);
+-
+- return duration;
++ return duration + overhead;
+ }
+ EXPORT_SYMBOL_GPL(ieee80211_calc_rx_airtime);
+
+@@ -530,46 +546,56 @@ static bool ieee80211_fill_rate_info(str
+ return false;
+ }
+
+-static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
+- struct ieee80211_tx_rate *rate,
+- struct rate_info *ri,
+- u8 band, int len)
++static int ieee80211_fill_rx_status(struct ieee80211_rx_status *stat,
++ struct ieee80211_hw *hw,
++ struct ieee80211_tx_rate *rate,
++ struct rate_info *ri, u8 band, int len)
+ {
+- struct ieee80211_rx_status stat = {
+- .band = band,
+- };
++ memset(stat, 0, sizeof(*stat));
++ stat->band = band;
+
+- if (ieee80211_fill_rate_info(hw, &stat, band, ri))
+- goto out;
++ if (ieee80211_fill_rate_info(hw, stat, band, ri))
++ return 0;
+
+ if (rate->idx < 0 || !rate->count)
+- return 0;
++ return -1;
+
+ if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
+- stat.bw = RATE_INFO_BW_80;
++ stat->bw = RATE_INFO_BW_80;
+ else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+- stat.bw = RATE_INFO_BW_40;
++ stat->bw = RATE_INFO_BW_40;
+ else
+- stat.bw = RATE_INFO_BW_20;
++ stat->bw = RATE_INFO_BW_20;
+
+- stat.enc_flags = 0;
++ stat->enc_flags = 0;
+ if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+- stat.enc_flags |= RX_ENC_FLAG_SHORTPRE;
++ stat->enc_flags |= RX_ENC_FLAG_SHORTPRE;
+ if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
+- stat.enc_flags |= RX_ENC_FLAG_SHORT_GI;
++ stat->enc_flags |= RX_ENC_FLAG_SHORT_GI;
+
+- stat.rate_idx = rate->idx;
++ stat->rate_idx = rate->idx;
+ if (rate->flags & IEEE80211_TX_RC_VHT_MCS) {
+- stat.encoding = RX_ENC_VHT;
+- stat.rate_idx = ieee80211_rate_get_vht_mcs(rate);
+- stat.nss = ieee80211_rate_get_vht_nss(rate);
++ stat->encoding = RX_ENC_VHT;
++ stat->rate_idx = ieee80211_rate_get_vht_mcs(rate);
++ stat->nss = ieee80211_rate_get_vht_nss(rate);
+ } else if (rate->flags & IEEE80211_TX_RC_MCS) {
+- stat.encoding = RX_ENC_HT;
++ stat->encoding = RX_ENC_HT;
+ } else {
+- stat.encoding = RX_ENC_LEGACY;
++ stat->encoding = RX_ENC_LEGACY;
+ }
+
+-out:
++ return 0;
++}
++
++static u32 ieee80211_calc_tx_airtime_rate(struct ieee80211_hw *hw,
++ struct ieee80211_tx_rate *rate,
++ struct rate_info *ri,
++ u8 band, int len)
++{
++ struct ieee80211_rx_status stat;
++
++ ieee80211_fill_rx_status(&stat, hw, rate, ri, band, len);
++
+ return ieee80211_calc_rx_airtime(hw, &stat, len);
+ }
+
diff --git a/package/kernel/mac80211/patches/subsys/313-mac80211-improve-AQL-aggregation-estimation-for-low-.patch b/package/kernel/mac80211/patches/subsys/313-mac80211-improve-AQL-aggregation-estimation-for-low-.patch
new file mode 100644
index 0000000000..565d9bec43
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/313-mac80211-improve-AQL-aggregation-estimation-for-low-.patch
@@ -0,0 +1,66 @@
+From: Felix Fietkau <nbd at nbd.name>
+Date: Wed, 12 Aug 2020 17:07:10 +0200
+Subject: [PATCH] mac80211: improve AQL aggregation estimation for low data
+ rates
+
+Links with low data rates use much smaller aggregates and are much more
+sensitive to latency added by bufferbloat.
+Tune the assumed aggregation length based on the tx rate duration.
+
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+---
+
+--- a/net/mac80211/airtime.c
++++ b/net/mac80211/airtime.c
+@@ -646,27 +646,40 @@ u32 ieee80211_calc_expected_tx_airtime(s
+ if (pubsta) {
+ struct sta_info *sta = container_of(pubsta, struct sta_info,
+ sta);
++ struct ieee80211_rx_status stat;
+ struct ieee80211_tx_rate *rate = &sta->tx_stats.last_rate;
+ struct rate_info *ri = &sta->tx_stats.last_rate_info;
+- u32 airtime;
++ u32 duration, overhead;
++ u8 agg_shift;
+
+- if (!(rate->flags & (IEEE80211_TX_RC_VHT_MCS |
+- IEEE80211_TX_RC_MCS)))
+- ampdu = false;
++ ieee80211_fill_rx_status(&stat, hw, rate, ri, band, len);
++
++ if (stat.encoding == RX_ENC_LEGACY || !ampdu)
++ return ieee80211_calc_rx_airtime(hw, &stat, len);
+
++ duration = ieee80211_get_rate_duration(hw, &stat, &overhead);
+ /*
+ * Assume that HT/VHT transmission on any AC except VO will
+ * use aggregation. Since we don't have reliable reporting
+- * of aggregation length, assume an average of 16.
++ * of aggregation length, assume an average size based on the
++ * tx rate.
+ * This will not be very accurate, but much better than simply
+- * assuming un-aggregated tx.
++ * assuming un-aggregated tx in all cases.
+ */
+- airtime = ieee80211_calc_tx_airtime_rate(hw, rate, ri, band,
+- ampdu ? len * 16 : len);
+- if (ampdu)
+- airtime /= 16;
++ if (duration > 400) /* <= VHT20 MCS2 1S */
++ agg_shift = 1;
++ else if (duration > 250) /* <= VHT20 MCS3 1S or MCS1 2S */
++ agg_shift = 2;
++ else if (duration > 150) /* <= VHT20 MCS5 1S or MCS3 2S */
++ agg_shift = 3;
++ else
++ agg_shift = 4;
+
+- return airtime;
++ duration *= len;
++ duration /= AVG_PKT_SIZE;
++ duration /= 1024;
++
++ return duration + (overhead >> agg_shift);
+ }
+
+ if (!conf)
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