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Use lookup-table instead of macro for TX rate estimates

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Change INTERPOLATE_RATE() macro to a lookup-table instead for the sake
of readability.

Signed-off-by: Matthew Wang <matthewmwang@chromium.org>
This commit is contained in:
Matthew Wang 2020-06-01 17:10:13 -07:00 committed by Jouni Malinen
parent fa09b85c4e
commit 2ff5a1fdb1
1 changed files with 75 additions and 47 deletions
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122
wpa_supplicant/scan.c
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@ -2187,6 +2187,60 @@ void scan_snr(struct wpa_scan_res *res)
} }
/* Minimum SNR required to achieve a certain bitrate. */
struct minsnr_bitrate_entry {
int minsnr;
unsigned int bitrate; /* in Mbps */
};
/* VHT needs to be enabled in order to achieve MCS8 and MCS9 rates. */
static const int vht_mcs = 8;
static const struct minsnr_bitrate_entry vht20_table[] = {
{ 0, 0 },
{ 2, 6500 }, /* HT20 MCS0 */
{ 5, 13000 }, /* HT20 MCS1 */
{ 9, 19500 }, /* HT20 MCS2 */
{ 11, 26000 }, /* HT20 MCS3 */
{ 15, 39000 }, /* HT20 MCS4 */
{ 18, 52000 }, /* HT20 MCS5 */
{ 20, 58500 }, /* HT20 MCS6 */
{ 25, 65000 }, /* HT20 MCS7 */
{ 29, 78000 }, /* VHT20 MCS8 */
{ -1, 78000 } /* SNR > 29 */
};
static const struct minsnr_bitrate_entry vht40_table[] = {
{ 0, 0 },
{ 5, 13500 }, /* HT40 MCS0 */
{ 8, 27000 }, /* HT40 MCS1 */
{ 12, 40500 }, /* HT40 MCS2 */
{ 14, 54000 }, /* HT40 MCS3 */
{ 18, 81000 }, /* HT40 MCS4 */
{ 21, 108000 }, /* HT40 MCS5 */
{ 23, 121500 }, /* HT40 MCS6 */
{ 28, 135000 }, /* HT40 MCS7 */
{ 32, 162000 }, /* VHT40 MCS8 */
{ 34, 180000 }, /* VHT40 MCS9 */
{ -1, 180000 } /* SNR > 34 */
};
static const struct minsnr_bitrate_entry vht80_table[] = {
{ 0, 0 },
{ 8, 29300 }, /* VHT80 MCS0 */
{ 11, 58500 }, /* VHT80 MCS1 */
{ 15, 87800 }, /* VHT80 MCS2 */
{ 17, 117000 }, /* VHT80 MCS3 */
{ 21, 175500 }, /* VHT80 MCS4 */
{ 24, 234000 }, /* VHT80 MCS5 */
{ 26, 263300 }, /* VHT80 MCS6 */
{ 31, 292500 }, /* VHT80 MCS7 */
{ 35, 351000 }, /* VHT80 MCS8 */
{ 37, 390000 }, /* VHT80 MCS9 */
{ -1, 390000 } /* SNR > 37 */
};
static unsigned int interpolate_rate(int snr, int snr0, int snr1, static unsigned int interpolate_rate(int snr, int snr0, int snr1,
int rate0, int rate1) int rate0, int rate1)
{ {
@ -2194,68 +2248,42 @@ static unsigned int interpolate_rate(int snr, int snr0, int snr1,
} }
#define INTERPOLATE_RATE(snr0, snr1, rate0, rate1) \ static unsigned int max_rate(const struct minsnr_bitrate_entry table[],
if (snr < (snr1)) \ int snr, int vht)
return interpolate_rate(snr, (snr0), (snr1), (rate0), (rate1)) {
const struct minsnr_bitrate_entry *prev, *entry = table;
while ((entry->minsnr != -1) &&
(snr >= entry->minsnr) &&
(vht || entry - table <= vht_mcs))
entry++;
if (entry == table)
return entry->bitrate;
prev = entry - 1;
if (entry->minsnr == -1 || (!vht && entry - table > vht_mcs))
return prev->bitrate;
return interpolate_rate(snr, prev->minsnr, entry->minsnr, prev->bitrate,
entry->bitrate);
}
static unsigned int max_ht20_rate(int snr, int vht) static unsigned int max_ht20_rate(int snr, int vht)
{ {
if (snr < 0) return max_rate(vht20_table, snr, vht);
return 0;
INTERPOLATE_RATE(0, 2, 0, 6500); /* HT20 MCS0 */
INTERPOLATE_RATE(2, 5, 6500, 13000); /* HT20 MCS1 */
INTERPOLATE_RATE(5, 9, 13000, 19500); /* HT20 MCS2 */
INTERPOLATE_RATE(9, 11, 19500, 26000); /* HT20 MCS3 */
INTERPOLATE_RATE(11, 15, 26000, 39000); /* HT20 MCS4 */
INTERPOLATE_RATE(15, 18, 39000, 52000); /* HT20 MCS5 */
INTERPOLATE_RATE(18, 20, 52000, 58500); /* HT20 MCS6 */
INTERPOLATE_RATE(20, 25, 58500, 65000); /* HT20 MCS7 */
if (!vht)
return 65000;
INTERPOLATE_RATE(25, 29, 65000, 78000); /* VHT20 MCS8 */
return 78000;
} }
static unsigned int max_ht40_rate(int snr, int vht) static unsigned int max_ht40_rate(int snr, int vht)
{ {
if (snr < 0) return max_rate(vht40_table, snr, vht);
return 0;
INTERPOLATE_RATE(0, 5, 0, 13500); /* HT40 MCS0 */
INTERPOLATE_RATE(5, 8, 13500, 27000); /* HT40 MCS1 */
INTERPOLATE_RATE(8, 12, 27000, 40500); /* HT40 MCS2 */
INTERPOLATE_RATE(12, 14, 40500, 54000); /* HT40 MCS3 */
INTERPOLATE_RATE(14, 18, 54000, 81000); /* HT40 MCS4 */
INTERPOLATE_RATE(18, 21, 81000, 108000); /* HT40 MCS5 */
INTERPOLATE_RATE(21, 23, 108000, 121500); /* HT40 MCS6 */
INTERPOLATE_RATE(23, 28, 121500, 135000); /* HT40 MCS7 */
if (!vht)
return 135000;
INTERPOLATE_RATE(28, 32, 135000, 162000); /* VHT40 MCS8 */
INTERPOLATE_RATE(32, 34, 162000, 180000); /* VHT40 MCS9 */
return 180000;
} }
static unsigned int max_vht80_rate(int snr) static unsigned int max_vht80_rate(int snr)
{ {
if (snr < 0) return max_rate(vht80_table, snr, 1);
return 0;
INTERPOLATE_RATE(0, 8, 0, 29300); /* VHT80 MCS0 */
INTERPOLATE_RATE(8, 11, 29300, 58500); /* VHT80 MCS1 */
INTERPOLATE_RATE(11, 15, 58500, 87800); /* VHT80 MCS2 */
INTERPOLATE_RATE(15, 17, 87800, 117000); /* VHT80 MCS3 */
INTERPOLATE_RATE(17, 21, 117000, 175500); /* VHT80 MCS4 */
INTERPOLATE_RATE(21, 24, 175500, 234000); /* VHT80 MCS5 */
INTERPOLATE_RATE(24, 26, 234000, 263300); /* VHT80 MCS6 */
INTERPOLATE_RATE(26, 31, 263300, 292500); /* VHT80 MCS7 */
INTERPOLATE_RATE(31, 35, 292500, 351000); /* VHT80 MCS8 */
INTERPOLATE_RATE(35, 37, 351000, 390000); /* VHT80 MCS9 */
return 390000;
} }
#undef INTERPOLATE_RATE
unsigned int wpas_get_est_tpt(const struct wpa_supplicant *wpa_s, unsigned int wpas_get_est_tpt(const struct wpa_supplicant *wpa_s,
const u8 *ies, size_t ies_len, int rate, const u8 *ies, size_t ies_len, int rate,