ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/package/kernel/mac80211/patches/subsys/337-mac80211-minstrel_ht-clean-up-CCK-code.patch b/package/kernel/mac80211/patches/subsys/337-mac80211-minstrel_ht-clean-up-CCK-code.patch
new file mode 100644
index 0000000..f667d2c
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/337-mac80211-minstrel_ht-clean-up-CCK-code.patch
@@ -0,0 +1,166 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Fri, 25 Dec 2020 16:22:52 +0100
+Subject: [PATCH] mac80211: minstrel_ht: clean up CCK code
+
+- move ack overhead out of rate duration table
+- remove cck_supported, cck_supported_short
+
+Preparation for adding OFDM legacy rates support
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -136,20 +136,16 @@
+ __VHT_GROUP(_streams, _sgi, _bw, \
+ VHT_GROUP_SHIFT(_streams, _sgi, _bw))
+
+-#define CCK_DURATION(_bitrate, _short, _len) \
++#define CCK_DURATION(_bitrate, _short) \
+ (1000 * (10 /* SIFS */ + \
+ (_short ? 72 + 24 : 144 + 48) + \
+- (8 * (_len + 4) * 10) / (_bitrate)))
+-
+-#define CCK_ACK_DURATION(_bitrate, _short) \
+- (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \
+- CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE))
++ (8 * (AVG_PKT_SIZE + 4) * 10) / (_bitrate)))
+
+ #define CCK_DURATION_LIST(_short, _s) \
+- CCK_ACK_DURATION(10, _short) >> _s, \
+- CCK_ACK_DURATION(20, _short) >> _s, \
+- CCK_ACK_DURATION(55, _short) >> _s, \
+- CCK_ACK_DURATION(110, _short) >> _s
++ CCK_DURATION(10, _short) >> _s, \
++ CCK_DURATION(20, _short) >> _s, \
++ CCK_DURATION(55, _short) >> _s, \
++ CCK_DURATION(110, _short) >> _s
+
+ #define __CCK_GROUP(_s) \
+ [MINSTREL_CCK_GROUP] = { \
+@@ -163,7 +159,7 @@
+ }
+
+ #define CCK_GROUP_SHIFT \
+- GROUP_SHIFT(CCK_ACK_DURATION(10, false))
++ GROUP_SHIFT(CCK_DURATION(10, false))
+
+ #define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT)
+
+@@ -349,15 +345,19 @@ int
+ minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
+ int prob_avg)
+ {
+- unsigned int nsecs = 0;
++ unsigned int nsecs = 0, overhead = mi->overhead;
++ unsigned int ampdu_len = 1;
+
+ /* do not account throughput if sucess prob is below 10% */
+ if (prob_avg < MINSTREL_FRAC(10, 100))
+ return 0;
+
+- if (group != MINSTREL_CCK_GROUP)
+- nsecs = 1000 * mi->overhead / minstrel_ht_avg_ampdu_len(mi);
++ if (group == MINSTREL_CCK_GROUP)
++ overhead = mi->overhead_legacy;
++ else
++ ampdu_len = minstrel_ht_avg_ampdu_len(mi);
+
++ nsecs = 1000 * overhead / ampdu_len;
+ nsecs += minstrel_mcs_groups[group].duration[rate] <<
+ minstrel_mcs_groups[group].shift;
+
+@@ -1031,7 +1031,10 @@ minstrel_calc_retransmit(struct minstrel
+ ctime += (t_slot * cw) >> 1;
+ cw = min((cw << 1) | 1, mp->cw_max);
+
+- if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) {
++ if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) {
++ overhead = mi->overhead_legacy;
++ overhead_rtscts = mi->overhead_legacy_rtscts;
++ } else {
+ overhead = mi->overhead;
+ overhead_rtscts = mi->overhead_rtscts;
+ }
+@@ -1369,18 +1372,14 @@ minstrel_ht_update_cck(struct minstrel_p
+ if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES))
+ return;
+
+- mi->cck_supported = 0;
+- mi->cck_supported_short = 0;
+ for (i = 0; i < 4; i++) {
+ if (!rate_supported(sta, sband->band, mp->cck_rates[i]))
+ continue;
+
+- mi->cck_supported |= BIT(i);
++ mi->supported[MINSTREL_CCK_GROUP] |= BIT(i);
+ if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE)
+- mi->cck_supported_short |= BIT(i);
++ mi->supported[MINSTREL_CCK_GROUP] |= BIT(i + 4);
+ }
+-
+- mi->supported[MINSTREL_CCK_GROUP] = mi->cck_supported;
+ }
+
+ static void
+@@ -1394,12 +1393,13 @@ minstrel_ht_update_caps(void *priv, stru
+ struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
+ u16 ht_cap = sta->ht_cap.cap;
+ struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
++ const struct ieee80211_rate *ctl_rate;
++ bool ldpc, erp;
+ int use_vht;
+ int n_supported = 0;
+ int ack_dur;
+ int stbc;
+ int i;
+- bool ldpc;
+
+ /* fall back to the old minstrel for legacy stations */
+ if (!sta->ht_cap.ht_supported)
+@@ -1423,6 +1423,14 @@ minstrel_ht_update_caps(void *priv, stru
+ mi->overhead += ack_dur;
+ mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
+
++ ctl_rate = &sband->bitrates[rate_lowest_index(sband, sta)];
++ erp = ctl_rate->flags & IEEE80211_RATE_ERP_G;
++ ack_dur = ieee80211_frame_duration(sband->band, 10,
++ ctl_rate->bitrate, erp, 1,
++ ieee80211_chandef_get_shift(chandef));
++ mi->overhead_legacy = ack_dur;
++ mi->overhead_legacy_rtscts = mi->overhead_legacy + 2 * ack_dur;
++
+ mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
+
+ /* When using MRR, sample more on the first attempt, without delay */
+@@ -1523,8 +1531,6 @@ minstrel_ht_update_caps(void *priv, stru
+ if (!n_supported)
+ goto use_legacy;
+
+- mi->supported[MINSTREL_CCK_GROUP] |= mi->cck_supported_short << 4;
+-
+ /* create an initial rate table with the lowest supported rates */
+ minstrel_ht_update_stats(mp, mi, true);
+ minstrel_ht_update_rates(mp, mi);
+--- a/net/mac80211/rc80211_minstrel_ht.h
++++ b/net/mac80211/rc80211_minstrel_ht.h
+@@ -77,6 +77,8 @@ struct minstrel_ht_sta {
+ /* overhead time in usec for each frame */
+ unsigned int overhead;
+ unsigned int overhead_rtscts;
++ unsigned int overhead_legacy;
++ unsigned int overhead_legacy_rtscts;
+
+ unsigned int total_packets_last;
+ unsigned int total_packets_cur;
+@@ -97,9 +99,6 @@ struct minstrel_ht_sta {
+ /* current MCS group to be sampled */
+ u8 sample_group;
+
+- u8 cck_supported;
+- u8 cck_supported_short;
+-
+ /* Bitfield of supported MCS rates of all groups */
+ u16 supported[MINSTREL_GROUPS_NB];
+