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-rw-r--r--net/mac80211/airtime.c714
1 files changed, 714 insertions, 0 deletions
diff --git a/net/mac80211/airtime.c b/net/mac80211/airtime.c
new file mode 100644
index 000000000..758ef6366
--- /dev/null
+++ b/net/mac80211/airtime.c
@@ -0,0 +1,714 @@
+// SPDX-License-Identifier: ISC
+/*
+ * Copyright (C) 2019 Felix Fietkau <nbd@nbd.name>
+ */
+
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "sta_info.h"
+
+#define AVG_PKT_SIZE 1024
+
+/* Number of bits for an average sized packet */
+#define MCS_NBITS (AVG_PKT_SIZE << 3)
+
+/* Number of kilo-symbols (symbols * 1024) for a packet with (bps) bits per
+ * symbol. We use k-symbols to avoid rounding in the _TIME macros below.
+ */
+#define MCS_N_KSYMS(bps) DIV_ROUND_UP(MCS_NBITS << 10, (bps))
+
+/* Transmission time (in 1024 * usec) for a packet containing (ksyms) * 1024
+ * symbols.
+ */
+#define MCS_SYMBOL_TIME(sgi, ksyms) \
+ (sgi ? \
+ ((ksyms) * 4 * 18) / 20 : /* 3.6 us per sym */ \
+ ((ksyms) * 4) /* 4.0 us per sym */ \
+ )
+
+/* Transmit duration for the raw data part of an average sized packet */
+#define MCS_DURATION(streams, sgi, bps) \
+ ((u32)MCS_SYMBOL_TIME(sgi, MCS_N_KSYMS((streams) * (bps))))
+
+#define MCS_DURATION_S(shift, streams, sgi, bps) \
+ ((u16)((MCS_DURATION(streams, sgi, bps) >> shift)))
+
+/* These should match the values in enum nl80211_he_gi */
+#define HE_GI_08 0
+#define HE_GI_16 1
+#define HE_GI_32 2
+
+/* Transmission time (1024 usec) for a packet containing (ksyms) * k-symbols */
+#define HE_SYMBOL_TIME(gi, ksyms) \
+ (gi == HE_GI_08 ? \
+ ((ksyms) * 16 * 17) / 20 : /* 13.6 us per sym */ \
+ (gi == HE_GI_16 ? \
+ ((ksyms) * 16 * 18) / 20 : /* 14.4 us per sym */ \
+ ((ksyms) * 16) /* 16.0 us per sym */ \
+ ))
+
+/* Transmit duration for the raw data part of an average sized packet */
+#define HE_DURATION(streams, gi, bps) \
+ ((u32)HE_SYMBOL_TIME(gi, MCS_N_KSYMS((streams) * (bps))))
+
+#define HE_DURATION_S(shift, streams, gi, bps) \
+ (HE_DURATION(streams, gi, bps) >> shift)
+
+#define BW_20 0
+#define BW_40 1
+#define BW_80 2
+#define BW_160 3
+
+/*
+ * Define group sort order: HT40 -> SGI -> #streams
+ */
+#define IEEE80211_MAX_STREAMS 4
+#define IEEE80211_HT_STREAM_GROUPS 4 /* BW(=2) * SGI(=2) */
+#define IEEE80211_VHT_STREAM_GROUPS 8 /* BW(=4) * SGI(=2) */
+
+#define IEEE80211_HE_MAX_STREAMS 8
+#define IEEE80211_HE_STREAM_GROUPS 12 /* BW(=4) * GI(=3) */
+
+#define IEEE80211_HT_GROUPS_NB (IEEE80211_MAX_STREAMS * \
+ IEEE80211_HT_STREAM_GROUPS)
+#define IEEE80211_VHT_GROUPS_NB (IEEE80211_MAX_STREAMS * \
+ IEEE80211_VHT_STREAM_GROUPS)
+#define IEEE80211_HE_GROUPS_NB (IEEE80211_HE_MAX_STREAMS * \
+ IEEE80211_HE_STREAM_GROUPS)
+#define IEEE80211_GROUPS_NB (IEEE80211_HT_GROUPS_NB + \
+ IEEE80211_VHT_GROUPS_NB + \
+ IEEE80211_HE_GROUPS_NB)
+
+#define IEEE80211_HT_GROUP_0 0
+#define IEEE80211_VHT_GROUP_0 (IEEE80211_HT_GROUP_0 + IEEE80211_HT_GROUPS_NB)
+#define IEEE80211_HE_GROUP_0 (IEEE80211_VHT_GROUP_0 + IEEE80211_VHT_GROUPS_NB)
+
+#define MCS_GROUP_RATES 12
+
+#define HT_GROUP_IDX(_streams, _sgi, _ht40) \
+ IEEE80211_HT_GROUP_0 + \
+ IEEE80211_MAX_STREAMS * 2 * _ht40 + \
+ IEEE80211_MAX_STREAMS * _sgi + \
+ _streams - 1
+
+#define _MAX(a, b) (((a)>(b))?(a):(b))
+
+#define GROUP_SHIFT(duration) \
+ _MAX(0, 16 - __builtin_clz(duration))
+
+/* MCS rate information for an MCS group */
+#define __MCS_GROUP(_streams, _sgi, _ht40, _s) \
+ [HT_GROUP_IDX(_streams, _sgi, _ht40)] = { \
+ .shift = _s, \
+ .duration = { \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 54 : 26), \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 108 : 52), \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 162 : 78), \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 216 : 104), \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 324 : 156), \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 432 : 208), \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 486 : 234), \
+ MCS_DURATION_S(_s, _streams, _sgi, _ht40 ? 540 : 260) \
+ } \
+}
+
+#define MCS_GROUP_SHIFT(_streams, _sgi, _ht40) \
+ GROUP_SHIFT(MCS_DURATION(_streams, _sgi, _ht40 ? 54 : 26))
+
+#define MCS_GROUP(_streams, _sgi, _ht40) \
+ __MCS_GROUP(_streams, _sgi, _ht40, \
+ MCS_GROUP_SHIFT(_streams, _sgi, _ht40))
+
+#define VHT_GROUP_IDX(_streams, _sgi, _bw) \
+ (IEEE80211_VHT_GROUP_0 + \
+ IEEE80211_MAX_STREAMS * 2 * (_bw) + \
+ IEEE80211_MAX_STREAMS * (_sgi) + \
+ (_streams) - 1)
+
+#define BW2VBPS(_bw, r4, r3, r2, r1) \
+ (_bw == BW_160 ? r4 : _bw == BW_80 ? r3 : _bw == BW_40 ? r2 : r1)
+
+#define __VHT_GROUP(_streams, _sgi, _bw, _s) \
+ [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
+ .shift = _s, \
+ .duration = { \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 234, 117, 54, 26)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 468, 234, 108, 52)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 702, 351, 162, 78)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 936, 468, 216, 104)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 1404, 702, 324, 156)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 1872, 936, 432, 208)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 2106, 1053, 486, 234)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 2340, 1170, 540, 260)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 2808, 1404, 648, 312)), \
+ MCS_DURATION_S(_s, _streams, _sgi, \
+ BW2VBPS(_bw, 3120, 1560, 720, 346)) \
+ } \
+}
+
+#define VHT_GROUP_SHIFT(_streams, _sgi, _bw) \
+ GROUP_SHIFT(MCS_DURATION(_streams, _sgi, \
+ BW2VBPS(_bw, 243, 117, 54, 26)))
+
+#define VHT_GROUP(_streams, _sgi, _bw) \
+ __VHT_GROUP(_streams, _sgi, _bw, \
+ VHT_GROUP_SHIFT(_streams, _sgi, _bw))
+
+
+#define HE_GROUP_IDX(_streams, _gi, _bw) \
+ (IEEE80211_HE_GROUP_0 + \
+ IEEE80211_HE_MAX_STREAMS * 3 * (_bw) + \
+ IEEE80211_HE_MAX_STREAMS * (_gi) + \
+ (_streams) - 1)
+
+#define __HE_GROUP(_streams, _gi, _bw, _s) \
+ [HE_GROUP_IDX(_streams, _gi, _bw)] = { \
+ .shift = _s, \
+ .duration = { \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 979, 489, 230, 115)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 1958, 979, 475, 230)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 2937, 1468, 705, 345)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 3916, 1958, 936, 475)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 5875, 2937, 1411, 705)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 7833, 3916, 1872, 936)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 8827, 4406, 2102, 1051)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 9806, 4896, 2347, 1166)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 11764, 5875, 2808, 1411)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 13060, 6523, 3124, 1555)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 14702, 7344, 3513, 1756)), \
+ HE_DURATION_S(_s, _streams, _gi, \
+ BW2VBPS(_bw, 16329, 8164, 3902, 1944)) \
+ } \
+}
+
+#define HE_GROUP_SHIFT(_streams, _gi, _bw) \
+ GROUP_SHIFT(HE_DURATION(_streams, _gi, \
+ BW2VBPS(_bw, 979, 489, 230, 115)))
+
+#define HE_GROUP(_streams, _gi, _bw) \
+ __HE_GROUP(_streams, _gi, _bw, \
+ HE_GROUP_SHIFT(_streams, _gi, _bw))
+struct mcs_group {
+ u8 shift;
+ u16 duration[MCS_GROUP_RATES];
+};
+
+static const struct mcs_group airtime_mcs_groups[] = {
+ MCS_GROUP(1, 0, BW_20),
+ MCS_GROUP(2, 0, BW_20),
+ MCS_GROUP(3, 0, BW_20),
+ MCS_GROUP(4, 0, BW_20),
+
+ MCS_GROUP(1, 1, BW_20),
+ MCS_GROUP(2, 1, BW_20),
+ MCS_GROUP(3, 1, BW_20),
+ MCS_GROUP(4, 1, BW_20),
+
+ MCS_GROUP(1, 0, BW_40),
+ MCS_GROUP(2, 0, BW_40),
+ MCS_GROUP(3, 0, BW_40),
+ MCS_GROUP(4, 0, BW_40),
+
+ MCS_GROUP(1, 1, BW_40),
+ MCS_GROUP(2, 1, BW_40),
+ MCS_GROUP(3, 1, BW_40),
+ MCS_GROUP(4, 1, BW_40),
+
+ VHT_GROUP(1, 0, BW_20),
+ VHT_GROUP(2, 0, BW_20),
+ VHT_GROUP(3, 0, BW_20),
+ VHT_GROUP(4, 0, BW_20),
+
+ VHT_GROUP(1, 1, BW_20),
+ VHT_GROUP(2, 1, BW_20),
+ VHT_GROUP(3, 1, BW_20),
+ VHT_GROUP(4, 1, BW_20),
+
+ VHT_GROUP(1, 0, BW_40),
+ VHT_GROUP(2, 0, BW_40),
+ VHT_GROUP(3, 0, BW_40),
+ VHT_GROUP(4, 0, BW_40),
+
+ VHT_GROUP(1, 1, BW_40),
+ VHT_GROUP(2, 1, BW_40),
+ VHT_GROUP(3, 1, BW_40),
+ VHT_GROUP(4, 1, BW_40),
+
+ VHT_GROUP(1, 0, BW_80),
+ VHT_GROUP(2, 0, BW_80),
+ VHT_GROUP(3, 0, BW_80),
+ VHT_GROUP(4, 0, BW_80),
+
+ VHT_GROUP(1, 1, BW_80),
+ VHT_GROUP(2, 1, BW_80),
+ VHT_GROUP(3, 1, BW_80),
+ VHT_GROUP(4, 1, BW_80),
+
+ VHT_GROUP(1, 0, BW_160),
+ VHT_GROUP(2, 0, BW_160),
+ VHT_GROUP(3, 0, BW_160),
+ VHT_GROUP(4, 0, BW_160),
+
+ VHT_GROUP(1, 1, BW_160),
+ VHT_GROUP(2, 1, BW_160),
+ VHT_GROUP(3, 1, BW_160),
+ VHT_GROUP(4, 1, BW_160),
+
+ HE_GROUP(1, HE_GI_08, BW_20),
+ HE_GROUP(2, HE_GI_08, BW_20),
+ HE_GROUP(3, HE_GI_08, BW_20),
+ HE_GROUP(4, HE_GI_08, BW_20),
+ HE_GROUP(5, HE_GI_08, BW_20),
+ HE_GROUP(6, HE_GI_08, BW_20),
+ HE_GROUP(7, HE_GI_08, BW_20),
+ HE_GROUP(8, HE_GI_08, BW_20),
+
+ HE_GROUP(1, HE_GI_16, BW_20),
+ HE_GROUP(2, HE_GI_16, BW_20),
+ HE_GROUP(3, HE_GI_16, BW_20),
+ HE_GROUP(4, HE_GI_16, BW_20),
+ HE_GROUP(5, HE_GI_16, BW_20),
+ HE_GROUP(6, HE_GI_16, BW_20),
+ HE_GROUP(7, HE_GI_16, BW_20),
+ HE_GROUP(8, HE_GI_16, BW_20),
+
+ HE_GROUP(1, HE_GI_32, BW_20),
+ HE_GROUP(2, HE_GI_32, BW_20),
+ HE_GROUP(3, HE_GI_32, BW_20),
+ HE_GROUP(4, HE_GI_32, BW_20),
+ HE_GROUP(5, HE_GI_32, BW_20),
+ HE_GROUP(6, HE_GI_32, BW_20),
+ HE_GROUP(7, HE_GI_32, BW_20),
+ HE_GROUP(8, HE_GI_32, BW_20),
+
+ HE_GROUP(1, HE_GI_08, BW_40),
+ HE_GROUP(2, HE_GI_08, BW_40),
+ HE_GROUP(3, HE_GI_08, BW_40),
+ HE_GROUP(4, HE_GI_08, BW_40),
+ HE_GROUP(5, HE_GI_08, BW_40),
+ HE_GROUP(6, HE_GI_08, BW_40),
+ HE_GROUP(7, HE_GI_08, BW_40),
+ HE_GROUP(8, HE_GI_08, BW_40),
+
+ HE_GROUP(1, HE_GI_16, BW_40),
+ HE_GROUP(2, HE_GI_16, BW_40),
+ HE_GROUP(3, HE_GI_16, BW_40),
+ HE_GROUP(4, HE_GI_16, BW_40),
+ HE_GROUP(5, HE_GI_16, BW_40),
+ HE_GROUP(6, HE_GI_16, BW_40),
+ HE_GROUP(7, HE_GI_16, BW_40),
+ HE_GROUP(8, HE_GI_16, BW_40),
+
+ HE_GROUP(1, HE_GI_32, BW_40),
+ HE_GROUP(2, HE_GI_32, BW_40),
+ HE_GROUP(3, HE_GI_32, BW_40),
+ HE_GROUP(4, HE_GI_32, BW_40),
+ HE_GROUP(5, HE_GI_32, BW_40),
+ HE_GROUP(6, HE_GI_32, BW_40),
+ HE_GROUP(7, HE_GI_32, BW_40),
+ HE_GROUP(8, HE_GI_32, BW_40),
+
+ HE_GROUP(1, HE_GI_08, BW_80),
+ HE_GROUP(2, HE_GI_08, BW_80),
+ HE_GROUP(3, HE_GI_08, BW_80),
+ HE_GROUP(4, HE_GI_08, BW_80),
+ HE_GROUP(5, HE_GI_08, BW_80),
+ HE_GROUP(6, HE_GI_08, BW_80),
+ HE_GROUP(7, HE_GI_08, BW_80),
+ HE_GROUP(8, HE_GI_08, BW_80),
+
+ HE_GROUP(1, HE_GI_16, BW_80),
+ HE_GROUP(2, HE_GI_16, BW_80),
+ HE_GROUP(3, HE_GI_16, BW_80),
+ HE_GROUP(4, HE_GI_16, BW_80),
+ HE_GROUP(5, HE_GI_16, BW_80),
+ HE_GROUP(6, HE_GI_16, BW_80),
+ HE_GROUP(7, HE_GI_16, BW_80),
+ HE_GROUP(8, HE_GI_16, BW_80),
+
+ HE_GROUP(1, HE_GI_32, BW_80),
+ HE_GROUP(2, HE_GI_32, BW_80),
+ HE_GROUP(3, HE_GI_32, BW_80),
+ HE_GROUP(4, HE_GI_32, BW_80),
+ HE_GROUP(5, HE_GI_32, BW_80),
+ HE_GROUP(6, HE_GI_32, BW_80),
+ HE_GROUP(7, HE_GI_32, BW_80),
+ HE_GROUP(8, HE_GI_32, BW_80),
+
+ HE_GROUP(1, HE_GI_08, BW_160),
+ HE_GROUP(2, HE_GI_08, BW_160),
+ HE_GROUP(3, HE_GI_08, BW_160),
+ HE_GROUP(4, HE_GI_08, BW_160),
+ HE_GROUP(5, HE_GI_08, BW_160),
+ HE_GROUP(6, HE_GI_08, BW_160),
+ HE_GROUP(7, HE_GI_08, BW_160),
+ HE_GROUP(8, HE_GI_08, BW_160),
+
+ HE_GROUP(1, HE_GI_16, BW_160),
+ HE_GROUP(2, HE_GI_16, BW_160),
+ HE_GROUP(3, HE_GI_16, BW_160),
+ HE_GROUP(4, HE_GI_16, BW_160),
+ HE_GROUP(5, HE_GI_16, BW_160),
+ HE_GROUP(6, HE_GI_16, BW_160),
+ HE_GROUP(7, HE_GI_16, BW_160),
+ HE_GROUP(8, HE_GI_16, BW_160),
+
+ HE_GROUP(1, HE_GI_32, BW_160),
+ HE_GROUP(2, HE_GI_32, BW_160),
+ HE_GROUP(3, HE_GI_32, BW_160),
+ HE_GROUP(4, HE_GI_32, BW_160),
+ HE_GROUP(5, HE_GI_32, BW_160),
+ HE_GROUP(6, HE_GI_32, BW_160),
+ HE_GROUP(7, HE_GI_32, BW_160),
+ HE_GROUP(8, HE_GI_32, BW_160),
+};
+
+static u32
+ieee80211_calc_legacy_rate_duration(u16 bitrate, bool short_pre,
+ bool cck, int len)
+{
+ u32 duration;
+
+ if (cck) {
+ duration = 144 + 48; /* preamble + PLCP */
+ if (short_pre)
+ duration >>= 1;
+
+ duration += 10; /* SIFS */
+ } else {
+ duration = 20 + 16; /* premable + SIFS */
+ }
+
+ len <<= 3;
+ duration += (len * 10) / bitrate;
+
+ return duration;
+}
+
+static u32 ieee80211_get_rate_duration(struct ieee80211_hw *hw,
+ struct ieee80211_rx_status *status,
+ u32 *overhead)
+{
+ bool sgi = status->enc_flags & RX_ENC_FLAG_SHORT_GI;
+ int bw, streams;
+ int group, idx;
+ u32 duration;
+
+ switch (status->bw) {
+ case RATE_INFO_BW_20:
+ bw = BW_20;
+ break;
+ case RATE_INFO_BW_40:
+ bw = BW_40;
+ break;
+ case RATE_INFO_BW_80:
+ bw = BW_80;
+ break;
+ case RATE_INFO_BW_160:
+ bw = BW_160;
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+
+ switch (status->encoding) {
+ case RX_ENC_VHT:
+ streams = status->nss;
+ idx = status->rate_idx;
+ group = VHT_GROUP_IDX(streams, sgi, bw);
+ break;
+ case RX_ENC_HT:
+ streams = ((status->rate_idx >> 3) & 3) + 1;
+ idx = status->rate_idx & 7;
+ group = HT_GROUP_IDX(streams, sgi, bw);
+ break;
+ case RX_ENC_HE:
+ streams = status->nss;
+ idx = status->rate_idx;
+ group = HE_GROUP_IDX(streams, status->he_gi, bw);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ return 0;
+ }
+
+ if (WARN_ON_ONCE((status->encoding != RX_ENC_HE && streams > 4) ||
+ (status->encoding == RX_ENC_HE && streams > 8)))
+ return 0;
+
+ if (idx >= MCS_GROUP_RATES)
+ return 0;
+
+ 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;
+
+ return duration + overhead;
+}
+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 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)
+{
+ memset(stat, 0, sizeof(*stat));
+ stat->band = band;
+
+ if (ieee80211_fill_rate_info(hw, stat, band, ri))
+ return 0;
+
+ if (rate->idx < 0 || !rate->count)
+ return -1;
+
+ if (rate->flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
+ stat->bw = RATE_INFO_BW_160;
+ else if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
+ stat->bw = RATE_INFO_BW_80;
+ else if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+ stat->bw = RATE_INFO_BW_40;
+ else
+ stat->bw = RATE_INFO_BW_20;
+
+ stat->enc_flags = 0;
+ if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+ stat->enc_flags |= RX_ENC_FLAG_SHORTPRE;
+ if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
+ stat->enc_flags |= RX_ENC_FLAG_SHORT_GI;
+
+ 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);
+ } else if (rate->flags & IEEE80211_TX_RC_MCS) {
+ stat->encoding = RX_ENC_HT;
+ } else {
+ stat->encoding = RX_ENC_LEGACY;
+ }
+
+ 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;
+
+ if (ieee80211_fill_rx_status(&stat, hw, rate, ri, band, len))
+ return 0;
+
+ return ieee80211_calc_rx_airtime(hw, &stat, len);
+}
+
+u32 ieee80211_calc_tx_airtime(struct ieee80211_hw *hw,
+ struct ieee80211_tx_info *info,
+ int len)
+{
+ u32 duration = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(info->status.rates); i++) {
+ struct ieee80211_tx_rate *rate = &info->status.rates[i];
+ u32 cur_duration;
+
+ cur_duration = ieee80211_calc_tx_airtime_rate(hw, rate, NULL,
+ info->band, len);
+ if (!cur_duration)
+ break;
+
+ duration += cur_duration * rate->count;
+ }
+
+ return duration;
+}
+EXPORT_SYMBOL_GPL(ieee80211_calc_tx_airtime);
+
+u32 ieee80211_calc_expected_tx_airtime(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_sta *pubsta,
+ int len, bool ampdu)
+{
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_chanctx_conf *conf;
+ int rateidx, shift = 0;
+ bool cck, short_pream;
+ u32 basic_rates;
+ u8 band = 0;
+ u16 rate;
+
+ len += 38; /* Ethernet header length */
+
+ conf = rcu_dereference(vif->chanctx_conf);
+ if (conf) {
+ band = conf->def.chan->band;
+ shift = ieee80211_chandef_get_shift(&conf->def);
+ }
+
+ 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 duration, overhead;
+ u8 agg_shift;
+
+ if (ieee80211_fill_rx_status(&stat, hw, rate, ri, band, len))
+ return 0;
+
+ 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 size based on the
+ * tx rate.
+ * This will not be very accurate, but much better than simply
+ * assuming un-aggregated tx in all cases.
+ */
+ if (duration > 400 * 1024) /* <= VHT20 MCS2 1S */
+ agg_shift = 1;
+ else if (duration > 250 * 1024) /* <= VHT20 MCS3 1S or MCS1 2S */
+ agg_shift = 2;
+ else if (duration > 150 * 1024) /* <= VHT20 MCS5 1S or MCS2 2S */
+ agg_shift = 3;
+ else if (duration > 70 * 1024) /* <= VHT20 MCS5 2S */
+ agg_shift = 4;
+ else if (stat.encoding != RX_ENC_HE ||
+ duration > 20 * 1024) /* <= HE40 MCS6 2S */
+ agg_shift = 5;
+ else
+ agg_shift = 6;
+
+ duration *= len;
+ duration /= AVG_PKT_SIZE;
+ duration /= 1024;
+ duration += (overhead >> agg_shift);
+
+ return max_t(u32, duration, 4);
+ }
+
+ if (!conf)
+ return 0;
+
+ /* No station to get latest rate from, so calculate the worst-case
+ * duration using the lowest configured basic rate.
+ */
+ sband = hw->wiphy->bands[band];
+
+ basic_rates = vif->bss_conf.basic_rates;
+ short_pream = vif->bss_conf.use_short_preamble;
+
+ rateidx = basic_rates ? ffs(basic_rates) - 1 : 0;
+ rate = sband->bitrates[rateidx].bitrate << shift;
+ cck = sband->bitrates[rateidx].flags & IEEE80211_RATE_MANDATORY_B;
+
+ return ieee80211_calc_legacy_rate_duration(rate, short_pream, cck, len);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 05:33:28 +0000