wlan-ap-Telecominfraproject/feeds/qca/hostapd/patches/r04-005-hostapd-Update-Wide-Bandwidth-Channel-Switch-element.patch

From a67a5bed168483c24435746061467be007053d68 Mon Sep 17 00:00:00 2001
From: Yuvarani V <quic_yuvarani@quicinc.com>
Date: Sun, 3 Dec 2023 11:10:27 +0530
Subject: [PATCH] hostapd: Update Wide Bandwidth Channel Switch element

Update Wide Bandwidth Channel Switch element as per Draft P802.11Revme_D4.0
(9.4.2.159 Wide Bandwidth Channel Switch element).

Update the below subfields,
New Channel Width,
New Channel Center Frequency Segment 0 and
New Channel Center Frequency Segment 1
as per Draft P802.11Revme_D4.0 for 160 MHz and 80+80 MHz bandwidth.

Signed-off-by: Yuvarani V <quic_yuvarani@quicinc.com>
---
 src/ap/ieee802_11.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

--- a/src/ap/ieee802_11.c
+++ b/src/ap/ieee802_11.c
@@ -7183,20 +7183,25 @@ u8 *hostapd_eid_wide_bw_chan_switch(stru
 	struct ieee80211_wb_chsw_element *wb_chsw_elem;
 	u8 bw;
 
-	/* bandwidth: 0: 40, 1: 80, 2: 160, 3: 80+80, 4: 320 */
+	/* bandwidth: 0: 40, 1: 80, 160, 80+80, 4: 320 as per Draft P802.11Revme_D4.0 */
 	switch (hapd->cs_freq_params.bandwidth) {
 	case 40:
 		bw = 0;
 		break;
 	case 80:
-		/* check if it's 80+80 */
-		if (!hapd->cs_freq_params.center_freq2)
-			bw = 1;
-		else
-			bw = 3;
+		bw = 1;
 		break;
 	case 160:
-		bw = 2;
+		bw = 1;
+		/* ccfs1 - the channel center frequency index of the 160 MHz channel */
+		ccfs1 = ccfs0;
+		/* ccfs0 - the channel center frequency index of the 80 MHz
+		 * channel segment that contains the primary channel
+		 */
+		if (hapd->cs_freq_params.channel < ccfs0)
+			ccfs0 -= 8;
+		else
+			ccfs0 += 8;
 		break;
 	case 320:
 		bw = 4;
@@ -7309,7 +7314,7 @@ u8 *hostapd_eid_bw_indication(struct hos
 u8 *hostapd_eid_chsw_wrapper(struct hostapd_data *hapd, u8 *eid)
 {
 	u8 *pos = eid, *length_pos;
-	u8 ccfs0, ccfs1;
+	u8 ccfs0 = 0, ccfs1 = 0;
 	int freq;
 
 	if (!hapd->cs_freq_params.channel ||