openwrt/package/network/services/hostapd/patches/170-hostapd-update-cfs0-and-cfs1-for-160MHz.patch

From d4c4ef302f98fd6bce173b8636e7e350d8b44981 Mon Sep 17 00:00:00 2001
From: P Praneesh <ppranees@codeaurora.org>
Date: Fri, 19 Mar 2021 12:17:27 +0530
Subject: [PATCH] hostapd: update cfs0 and cfs1 for 160MHz

As per standard Draft P802.11ax_D8.0,( Table 26-9—Setting
of the VHT Channel Width and VHT NSS at an HE STA
transmitting the OM Control subfield ), center frequency of
160MHz should be published in HT information subset 2 of
HT information when EXT NSS BW field is enabled.

If the supported number of NSS in 160MHz is at least max NSS
support, then center_freq_seg0 indicates the center frequency of 80MHz and
center_freq_seg1 indicates the center frequency of 160MHz.

If the supported number of NSS in 160MHz is less than max NSS
support, then center_freq_seg0 indicates the center frequency of 80MHz and
center_freq_seg1 is 0. The center frequency of 160MHz is published in HT
operation information element instead.

Signed-off-by: P Praneesh <ppranees@codeaurora.org>
---
 hostapd/config_file.c           |  2 ++
 src/ap/ieee802_11_ht.c          |  9 +++++++++
 src/ap/ieee802_11_vht.c         | 17 +++++++++++++++++
 src/common/hw_features_common.c |  1 +
 src/common/ieee802_11_defs.h    |  2 ++
 5 files changed, 31 insertions(+)

--- a/hostapd/config_file.c
+++ b/hostapd/config_file.c
@@ -1229,6 +1229,8 @@ static int hostapd_config_vht_capab(stru
 		conf->vht_capab |= VHT_CAP_RX_ANTENNA_PATTERN;
 	if (os_strstr(capab, "[TX-ANTENNA-PATTERN]"))
 		conf->vht_capab |= VHT_CAP_TX_ANTENNA_PATTERN;
+	if (os_strstr(capab, "[EXT-NSS-BW-SUPP]"))
+		conf->vht_capab |= VHT_CAP_EXTENDED_NSS_BW_SUPPORT;
 	return 0;
 }
 #endif /* CONFIG_IEEE80211AC */
--- a/src/ap/ieee802_11_ht.c
+++ b/src/ap/ieee802_11_ht.c
@@ -127,7 +127,9 @@ no_update:
 u8 * hostapd_eid_ht_operation(struct hostapd_data *hapd, u8 *eid)
 {
 	struct ieee80211_ht_operation *oper;
+	le32 vht_capabilities_info;
 	u8 *pos = eid;
+	u8 chwidth;
 
 	if (!hapd->iconf->ieee80211n || hapd->conf->disable_11n ||
 	    is_6ghz_op_class(hapd->iconf->op_class))
@@ -143,6 +145,13 @@ u8 * hostapd_eid_ht_operation(struct hos
 	oper->operation_mode = host_to_le16(hapd->iface->ht_op_mode);
 	set_ht_param(hapd, oper);
 
+	vht_capabilities_info = host_to_le32(hapd->iface->current_mode->vht_capab);
+	chwidth = hostapd_get_oper_chwidth(hapd->iconf);
+	if (vht_capabilities_info & VHT_CAP_EXTENDED_NSS_BW_SUPPORT
+		&& ((chwidth == CHANWIDTH_160MHZ) || (chwidth == CHANWIDTH_80P80MHZ))) {
+		oper->operation_mode = host_to_le16(hapd->iconf->vht_oper_centr_freq_seg0_idx << 5);
+	}
+
 	pos += sizeof(*oper);
 
 	return pos;
--- a/src/ap/ieee802_11_vht.c
+++ b/src/ap/ieee802_11_vht.c
@@ -26,6 +26,7 @@ u8 * hostapd_eid_vht_capabilities(struct
 	struct ieee80211_vht_capabilities *cap;
 	struct hostapd_hw_modes *mode = hapd->iface->current_mode;
 	u8 *pos = eid;
+	u8 chwidth;
 
 	if (!mode || is_6ghz_op_class(hapd->iconf->op_class))
 		return eid;
@@ -63,6 +64,17 @@ u8 * hostapd_eid_vht_capabilities(struct
 			host_to_le32(nsts << VHT_CAP_BEAMFORMEE_STS_OFFSET);
 	}
 
+	chwidth = hostapd_get_oper_chwidth(hapd->iconf);
+	if (((host_to_le32(mode->vht_capab)) & VHT_CAP_EXTENDED_NSS_BW_SUPPORT)
+		&& ((chwidth == CHANWIDTH_160MHZ) || (chwidth == CHANWIDTH_80P80MHZ))) {
+		cap->vht_capabilities_info |= VHT_CAP_EXTENDED_NSS_BW_SUPPORT;
+		cap->vht_capabilities_info &= ~(host_to_le32(VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ));
+		cap->vht_capabilities_info &= ~(host_to_le32(VHT_CAP_SUPP_CHAN_WIDTH_160MHZ));
+		cap->vht_capabilities_info &= ~(host_to_le32(VHT_CAP_SUPP_CHAN_WIDTH_MASK));
+	} else {
+		cap->vht_capabilities_info &= ~VHT_CAP_EXTENDED_NSS_BW_SUPPORT_MASK;
+	}
+
 	/* Supported MCS set comes from hw */
 	os_memcpy(&cap->vht_supported_mcs_set, mode->vht_mcs_set, 8);
 
@@ -75,6 +87,7 @@ u8 * hostapd_eid_vht_capabilities(struct
 u8 * hostapd_eid_vht_operation(struct hostapd_data *hapd, u8 *eid)
 {
 	struct ieee80211_vht_operation *oper;
+	le32 vht_capabilities_info;
 	u8 *pos = eid;
 	enum oper_chan_width oper_chwidth =
 		hostapd_get_oper_chwidth(hapd->iconf);
@@ -110,6 +123,7 @@ u8 * hostapd_eid_vht_operation(struct ho
 	oper->vht_op_info_chan_center_freq_seg1_idx = seg1;
 
 	oper->vht_op_info_chwidth = oper_chwidth;
+	vht_capabilities_info = host_to_le32(hapd->iface->current_mode->vht_capab);
 	if (oper_chwidth == CONF_OPER_CHWIDTH_160MHZ) {
 		/*
 		 * Convert 160 MHz channel width to new style as interop
@@ -123,6 +137,9 @@ u8 * hostapd_eid_vht_operation(struct ho
 			oper->vht_op_info_chan_center_freq_seg0_idx -= 8;
 		else
 			oper->vht_op_info_chan_center_freq_seg0_idx += 8;
+
+		if (vht_capabilities_info & VHT_CAP_EXTENDED_NSS_BW_SUPPORT)
+			oper->vht_op_info_chan_center_freq_seg1_idx = 0;
 	} else if (oper_chwidth == CONF_OPER_CHWIDTH_80P80MHZ) {
 		/*
 		 * Convert 80+80 MHz channel width to new style as interop
--- a/src/common/hw_features_common.c
+++ b/src/common/hw_features_common.c
@@ -898,6 +898,7 @@ int ieee80211ac_cap_check(u32 hw, u32 co
 	VHT_CAP_CHECK(VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB);
 	VHT_CAP_CHECK(VHT_CAP_RX_ANTENNA_PATTERN);
 	VHT_CAP_CHECK(VHT_CAP_TX_ANTENNA_PATTERN);
+	VHT_CAP_CHECK(VHT_CAP_EXTENDED_NSS_BW_SUPPORT);
 
 #undef VHT_CAP_CHECK
 #undef VHT_CAP_CHECK_MAX
--- a/src/common/ieee802_11_defs.h
+++ b/src/common/ieee802_11_defs.h
@@ -1401,6 +1401,8 @@ struct ieee80211_ampe_ie {
 #define VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB     ((u32) BIT(26) | BIT(27))
 #define VHT_CAP_RX_ANTENNA_PATTERN                  ((u32) BIT(28))
 #define VHT_CAP_TX_ANTENNA_PATTERN                  ((u32) BIT(29))
+#define VHT_CAP_EXTENDED_NSS_BW_SUPPORT		    ((u32) BIT(30))
+#define VHT_CAP_EXTENDED_NSS_BW_SUPPORT_MASK	    ((u32) BIT(30) | BIT(31))
 
 #define VHT_OPMODE_CHANNEL_WIDTH_MASK		    ((u8) BIT(0) | BIT(1))
 #define VHT_OPMODE_CHANNEL_RxNSS_MASK		    ((u8) BIT(4) | BIT(5) | \