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cfg80211: Add support to calculate and report 4096-QAM HE rates

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Drivers supporting 4096-QAM rates as a vendor extension in HE mode need
to update the correct rate info to userspace while using 4096-QAM (MCS12
and MCS13) in HE mode. Add support to calculate bitrates of HE-MCS12 and
HE-MCS13 which represent the 4096-QAM modulation schemes. The MCS12 and
MCS13 bitrates are defined in IEEE P802.11be/D0.1.

In addition, scale up the bitrates by 3*2048 in order to accommodate
calculations for the new MCS12 and MCS13 rates without losing fraction
values.

Signed-off-by: Vamsi Krishna <vamsin@codeaurora.org>
Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
Link: https://lore.kernel.org/r/20201029183457.7005-1-jouni@codeaurora.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Vamsi Krishna 2020-10-29 20:34:57 +02:00 committed by Johannes Berg
parent 9f0ffa4184
commit 9c97c88d2f
1 changed files with 17 additions and 15 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

32
net/wireless/util.c
View file

@ -1276,20 +1276,22 @@ static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
{
#define SCALE 2048
u16 mcs_divisors[12] = {
34133, /* 16.666666... */
17067, /* 8.333333... */
11378, /* 5.555555... */
8533, /* 4.166666... */
5689, /* 2.777777... */
4267, /* 2.083333... */
3923, /* 1.851851... */
3413, /* 1.666666... */
2844, /* 1.388888... */
2560, /* 1.250000... */
2276, /* 1.111111... */
2048, /* 1.000000... */
#define SCALE 6144
u32 mcs_divisors[14] = {
102399, /* 16.666666... */
51201, /* 8.333333... */
34134, /* 5.555555... */
25599, /* 4.166666... */
17067, /* 2.777777... */
12801, /* 2.083333... */
11769, /* 1.851851... */
10239, /* 1.666666... */
8532, /* 1.388888... */
7680, /* 1.250000... */
6828, /* 1.111111... */
6144, /* 1.000000... */
5690, /* 0.926106... */
5120, /* 0.833333... */
};
u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
u32 rates_969[3] = { 480388888, 453700000, 408333333 };
@ -1301,7 +1303,7 @@ static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
u64 tmp;
u32 result;
if (WARN_ON_ONCE(rate->mcs > 11))
if (WARN_ON_ONCE(rate->mcs > 13))
return 0;
if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))