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3a12c6679e
Legacy minstrel is essentially unmaintained and was showing poor performance Replace it with minstrel_ht and improve rate selection and sampling behavior Signed-off-by: Felix Fietkau <nbd@nbd.name>
167 lines
5.1 KiB
Diff
167 lines
5.1 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 25 Dec 2020 16:22:52 +0100
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Subject: [PATCH] mac80211: minstrel_ht: clean up CCK code
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- move ack overhead out of rate duration table
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- remove cck_supported, cck_supported_short
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Preparation for adding OFDM legacy rates support
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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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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@@ -136,20 +136,16 @@
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__VHT_GROUP(_streams, _sgi, _bw, \
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VHT_GROUP_SHIFT(_streams, _sgi, _bw))
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-#define CCK_DURATION(_bitrate, _short, _len) \
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+#define CCK_DURATION(_bitrate, _short) \
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(1000 * (10 /* SIFS */ + \
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(_short ? 72 + 24 : 144 + 48) + \
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- (8 * (_len + 4) * 10) / (_bitrate)))
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-
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-#define CCK_ACK_DURATION(_bitrate, _short) \
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- (CCK_DURATION((_bitrate > 10 ? 20 : 10), false, 60) + \
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- CCK_DURATION(_bitrate, _short, AVG_PKT_SIZE))
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+ (8 * (AVG_PKT_SIZE + 4) * 10) / (_bitrate)))
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#define CCK_DURATION_LIST(_short, _s) \
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- CCK_ACK_DURATION(10, _short) >> _s, \
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- CCK_ACK_DURATION(20, _short) >> _s, \
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- CCK_ACK_DURATION(55, _short) >> _s, \
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- CCK_ACK_DURATION(110, _short) >> _s
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+ CCK_DURATION(10, _short) >> _s, \
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+ CCK_DURATION(20, _short) >> _s, \
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+ CCK_DURATION(55, _short) >> _s, \
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+ CCK_DURATION(110, _short) >> _s
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#define __CCK_GROUP(_s) \
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[MINSTREL_CCK_GROUP] = { \
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@@ -163,7 +159,7 @@
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}
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#define CCK_GROUP_SHIFT \
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- GROUP_SHIFT(CCK_ACK_DURATION(10, false))
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+ GROUP_SHIFT(CCK_DURATION(10, false))
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#define CCK_GROUP __CCK_GROUP(CCK_GROUP_SHIFT)
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@@ -349,15 +345,19 @@ int
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minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
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int prob_avg)
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{
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- unsigned int nsecs = 0;
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+ unsigned int nsecs = 0, overhead = mi->overhead;
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+ unsigned int ampdu_len = 1;
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/* do not account throughput if sucess prob is below 10% */
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if (prob_avg < MINSTREL_FRAC(10, 100))
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return 0;
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- if (group != MINSTREL_CCK_GROUP)
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- nsecs = 1000 * mi->overhead / minstrel_ht_avg_ampdu_len(mi);
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+ if (group == MINSTREL_CCK_GROUP)
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+ overhead = mi->overhead_legacy;
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+ else
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+ ampdu_len = minstrel_ht_avg_ampdu_len(mi);
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+ nsecs = 1000 * overhead / ampdu_len;
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nsecs += minstrel_mcs_groups[group].duration[rate] <<
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minstrel_mcs_groups[group].shift;
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@@ -1031,7 +1031,10 @@ minstrel_calc_retransmit(struct minstrel
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ctime += (t_slot * cw) >> 1;
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cw = min((cw << 1) | 1, mp->cw_max);
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- if (index / MCS_GROUP_RATES != MINSTREL_CCK_GROUP) {
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+ if (index / MCS_GROUP_RATES == MINSTREL_CCK_GROUP) {
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+ overhead = mi->overhead_legacy;
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+ overhead_rtscts = mi->overhead_legacy_rtscts;
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+ } else {
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overhead = mi->overhead;
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overhead_rtscts = mi->overhead_rtscts;
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}
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@@ -1369,18 +1372,14 @@ minstrel_ht_update_cck(struct minstrel_p
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if (!ieee80211_hw_check(mp->hw, SUPPORTS_HT_CCK_RATES))
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return;
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- mi->cck_supported = 0;
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- mi->cck_supported_short = 0;
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for (i = 0; i < 4; i++) {
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if (!rate_supported(sta, sband->band, mp->cck_rates[i]))
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continue;
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- mi->cck_supported |= BIT(i);
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+ mi->supported[MINSTREL_CCK_GROUP] |= BIT(i);
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if (sband->bitrates[i].flags & IEEE80211_RATE_SHORT_PREAMBLE)
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- mi->cck_supported_short |= BIT(i);
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+ mi->supported[MINSTREL_CCK_GROUP] |= BIT(i + 4);
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}
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-
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- mi->supported[MINSTREL_CCK_GROUP] = mi->cck_supported;
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}
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static void
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@@ -1394,12 +1393,13 @@ minstrel_ht_update_caps(void *priv, stru
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struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
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u16 ht_cap = sta->ht_cap.cap;
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struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
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+ const struct ieee80211_rate *ctl_rate;
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+ bool ldpc, erp;
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int use_vht;
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int n_supported = 0;
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int ack_dur;
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int stbc;
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int i;
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- bool ldpc;
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/* fall back to the old minstrel for legacy stations */
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if (!sta->ht_cap.ht_supported)
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@@ -1423,6 +1423,14 @@ minstrel_ht_update_caps(void *priv, stru
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mi->overhead += ack_dur;
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mi->overhead_rtscts = mi->overhead + 2 * ack_dur;
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+ ctl_rate = &sband->bitrates[rate_lowest_index(sband, sta)];
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+ erp = ctl_rate->flags & IEEE80211_RATE_ERP_G;
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+ ack_dur = ieee80211_frame_duration(sband->band, 10,
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+ ctl_rate->bitrate, erp, 1,
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+ ieee80211_chandef_get_shift(chandef));
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+ mi->overhead_legacy = ack_dur;
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+ mi->overhead_legacy_rtscts = mi->overhead_legacy + 2 * ack_dur;
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+
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mi->avg_ampdu_len = MINSTREL_FRAC(1, 1);
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/* When using MRR, sample more on the first attempt, without delay */
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@@ -1523,8 +1531,6 @@ minstrel_ht_update_caps(void *priv, stru
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if (!n_supported)
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goto use_legacy;
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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, true);
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minstrel_ht_update_rates(mp, mi);
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--- a/net/mac80211/rc80211_minstrel_ht.h
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+++ b/net/mac80211/rc80211_minstrel_ht.h
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@@ -77,6 +77,8 @@ struct minstrel_ht_sta {
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/* overhead time in usec for each frame */
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unsigned int overhead;
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unsigned int overhead_rtscts;
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+ unsigned int overhead_legacy;
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+ unsigned int overhead_legacy_rtscts;
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unsigned int total_packets_last;
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unsigned int total_packets_cur;
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@@ -97,9 +99,6 @@ struct minstrel_ht_sta {
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/* current MCS group to be sampled */
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u8 sample_group;
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- u8 cck_supported;
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- u8 cck_supported_short;
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-
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/* Bitfield of supported MCS rates of all groups */
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u16 supported[MINSTREL_GROUPS_NB];
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