wifi: cfg80211: add initial UHR support

Add initial support for making UHR connections (or suppressing
that), adding UHR capable stations on the AP side, encoding
and decoding UHR MCSes (except rate calculation for the new
MCSes 17, 19, 20 and 23) as well as regulatory support.

Link: https://patch.msgid.link/20260130164259.54cc12fbb307.I26126bebd83c7ab17e99827489f946ceabb3521f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 79 insertions, 22 deletions

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 08c525835518..404fe604a8db 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -5,7 +5,7 @@
  * Copyright 2007-2009	Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  * Copyright 2017	Intel Deutschland GmbH
- * Copyright (C) 2018-2023, 2025 Intel Corporation
+ * Copyright (C) 2018-2023, 2025-2026 Intel Corporation
  */
 #include <linux/export.h>
 #include <linux/bitops.h>
@@ -1574,26 +1574,30 @@ static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
 	return result / 10000;
 }
 
-static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
+static u32 _cfg80211_calculate_bitrate_eht_uhr(struct rate_info *rate)
 {
 #define SCALE 6144
-	static const u32 mcs_divisors[16] = {
-		102399, /* 16.666666... */
-		 51201, /*  8.333333... */
-		 34134, /*  5.555555... */
-		 25599, /*  4.166666... */
-		 17067, /*  2.777777... */
-		 12801, /*  2.083333... */
-		 11377, /*  1.851725... */
-		 10239, /*  1.666666... */
-		  8532, /*  1.388888... */
-		  7680, /*  1.250000... */
-		  6828, /*  1.111111... */
-		  6144, /*  1.000000... */
-		  5690, /*  0.926106... */
-		  5120, /*  0.833333... */
-		409600, /* 66.666666... */
-		204800, /* 33.333333... */
+	static const u32 mcs_divisors[] = {
+		[ 0] = 102399, /* 16.666666... */
+		[ 1] =  51201, /*  8.333333... */
+		[ 2] =  34134, /*  5.555555... */
+		[ 3] =  25599, /*  4.166666... */
+		[ 4] =  17067, /*  2.777777... */
+		[ 5] =  12801, /*  2.083333... */
+		[ 6] =  11377, /*  1.851725... */
+		[ 7] =  10239, /*  1.666666... */
+		[ 8] =   8532, /*  1.388888... */
+		[ 9] =   7680, /*  1.250000... */
+		[10] =   6828, /*  1.111111... */
+		[11] =   6144, /*  1.000000... */
+		[12] =   5690, /*  0.926106... */
+		[13] =   5120, /*  0.833333... */
+		[14] = 409600, /* 66.666666... */
+		[15] = 204800, /* 33.333333... */
+		[17] =  38400, /*  6.250180... */
+		[19] =  19200, /*  3.125090... */
+		[20] =  15360, /*  2.500000... */
+		[23] =   9600, /*  1.562545... */
 	};
 	static const u32 rates_996[3] =  { 480388888, 453700000, 408333333 };
 	static const u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
@@ -1604,8 +1608,6 @@ static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
 	u64 tmp;
 	u32 result;
 
-	if (WARN_ON_ONCE(rate->mcs > 15))
-		return 0;
 	if (WARN_ON_ONCE(rate->eht_gi > NL80211_RATE_INFO_EHT_GI_3_2))
 		return 0;
 	if (WARN_ON_ONCE(rate->eht_ru_alloc >
@@ -1686,7 +1688,7 @@ static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
 		 rate->eht_ru_alloc == NL80211_RATE_INFO_EHT_RU_ALLOC_26)
 		result = rates_26[rate->eht_gi];
 	else {
-		WARN(1, "invalid EHT MCS: bw:%d, ru:%d\n",
+		WARN(1, "invalid EHT or UHR MCS: bw:%d, ru:%d\n",
 		     rate->bw, rate->eht_ru_alloc);
 		return 0;
 	}
@@ -1700,11 +1702,64 @@ static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
 	tmp *= rate->nss;
 	do_div(tmp, 8);
 
+	/* and handle interference mitigation - 0.9x */
+	if (rate->flags & RATE_INFO_FLAGS_UHR_IM) {
+		if (WARN(rate->nss != 1 || rate->mcs == 15,
+			 "invalid NSS or MCS for UHR IM\n"))
+			return 0;
+		tmp *= 9000;
+		do_div(tmp, 10000);
+	}
+
 	result = tmp;
 
 	return result / 10000;
 }
 
+static u32 cfg80211_calculate_bitrate_eht(struct rate_info *rate)
+{
+	if (WARN_ONCE(rate->mcs > 15, "bad EHT MCS %d\n", rate->mcs))
+		return 0;
+
+	if (WARN_ONCE(rate->flags & (RATE_INFO_FLAGS_UHR_ELR_MCS |
+				     RATE_INFO_FLAGS_UHR_IM),
+		      "bad EHT MCS flags 0x%x\n", rate->flags))
+		return 0;
+
+	return _cfg80211_calculate_bitrate_eht_uhr(rate);
+}
+
+static u32 cfg80211_calculate_bitrate_uhr(struct rate_info *rate)
+{
+	if (rate->flags & RATE_INFO_FLAGS_UHR_ELR_MCS) {
+		WARN_ONCE(rate->eht_gi != NL80211_RATE_INFO_EHT_GI_1_6,
+			  "bad UHR ELR guard interval %d\n",
+			  rate->eht_gi);
+		WARN_ONCE(rate->mcs > 1, "bad UHR ELR MCS %d\n", rate->mcs);
+		WARN_ONCE(rate->nss != 1, "bad UHR ELR NSS %d\n", rate->nss);
+		WARN_ONCE(rate->bw != RATE_INFO_BW_20,
+			  "bad UHR ELR bandwidth %d\n",
+			  rate->bw);
+		WARN_ONCE(rate->flags & RATE_INFO_FLAGS_UHR_IM,
+			  "bad UHR MCS flags 0x%x\n", rate->flags);
+		if (rate->mcs == 0)
+			return 17;
+		return 33;
+	}
+
+	switch (rate->mcs) {
+	case 0 ... 15:
+	case 17:
+	case 19:
+	case 20:
+	case 23:
+		return _cfg80211_calculate_bitrate_eht_uhr(rate);
+	}
+
+	WARN_ONCE(1, "bad UHR MCS %d\n", rate->mcs);
+	return 0;
+}
+
 static u32 cfg80211_calculate_bitrate_s1g(struct rate_info *rate)
 {
 	/* For 1, 2, 4, 8 and 16 MHz channels */
@@ -1829,6 +1884,8 @@ u32 cfg80211_calculate_bitrate(struct rate_info *rate)
 		return cfg80211_calculate_bitrate_he(rate);
 	if (rate->flags & RATE_INFO_FLAGS_EHT_MCS)
 		return cfg80211_calculate_bitrate_eht(rate);
+	if (rate->flags & RATE_INFO_FLAGS_UHR_MCS)
+		return cfg80211_calculate_bitrate_uhr(rate);
 	if (rate->flags & RATE_INFO_FLAGS_S1G_MCS)
 		return cfg80211_calculate_bitrate_s1g(rate);