[参考译文] CC3351：您能否更新 5.10.y 的反向端口补丁？

admin

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/wireless-connectivity/wi-fi-group/wifi/f/wi-fi-forum/1557551/cc3351-could-you-please-update-the-backport-patch-for-5-10-y

器件型号：CC3351

工具/软件：

尊敬的 TI 专家：

我在移植到 Linux 内核 5.10.240 (https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.240.tar.xz) 时遇到 CC33XX-Linux-MPU v1.0.2.10 补丁问题。

首先我应用了补丁 cc33xx_kernel.patch、但我发现了一些拒绝 (net/mac80211/mlme.c.Rej)。

@@ -235,11 +235,20 @@
 	if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
 		ieee80211_chandef_ht_oper(ht_oper, chandef);
 	} else {
+
 		mlme_dbg(sdata, "40 MHz not supported\n");
-		/* 40 MHz (and 80 MHz) must be supported for VHT */
-		ret = IEEE80211_CONN_DISABLE_VHT;
-		/* also mark 40 MHz disabled */
-		ret |= IEEE80211_CONN_DISABLE_40MHZ;
+
+		/* 40 MHz (and 80 MHz) must be supported for 5GHZ VHT
+			unless peer allows operating mode notification. If so a 20MHz 
+			station can ask from peer to lower bandwidth. */
+		if (channel->band != NL80211_BAND_2GHZ){
+				ret = IEEE80211_CONN_DISABLE_40MHZ;
+		}else{
+				ret = IEEE80211_CONN_DISABLE_VHT;
+				/* also mark 40 MHz disabled */
+				ret |= IEEE80211_CONN_DISABLE_40MHZ;
+		}
+			
 		goto out;
 	}
 
@@ -5027,6 +5039,25 @@
 					     &assoc_data->link[link_id].ap_vht_cap,
 					     assoc_data->link[link_id].conn_flags);
 
+		//Add operation mode notification element when operating at 20 MHz bandwidth
+		if(chanctx_conf->def.width == NL80211_CHAN_WIDTH_20)
+		{
+			/*  Operating Mode Notification element */
+			rx_nss = 0;
+			rx_nss_type= 0;
+			opmode_notif |= IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ; 
+			rx_nss <<= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
+			rx_nss_type <<= (IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT + 3);
+			opmode_notif |= rx_nss;
+			opmode_notif |= rx_nss_type;
+
+			pos = skb_put(skb, 2 + sizeof(u8));
+
+			*pos++ = WLAN_EID_OPMODE_NOTIF;
+			*pos++ = sizeof(u8);
+			*pos++ = opmode_notif;
+		}
+
 		if (link)
 			link->conf->mu_mimo_owner = mu_mimo_owner;
 		ADD_PRESENT_ELEM(WLAN_EID_VHT_CAPABILITY);
@@ -5316,6 +5347,7 @@
 		/* HT, VHT, HE, EHT */
 		size += 2 + sizeof(struct ieee80211_ht_cap);
 		size += 2 + sizeof(struct ieee80211_vht_cap);
+		size += 2 + sizeof(u8); /*VHT operating mode Notification elem*/
 		size += 2 + 1 + sizeof(struct ieee80211_he_cap_elem) +
 			sizeof(struct ieee80211_he_mcs_nss_supp) +
 			IEEE80211_HE_PPE_THRES_MAX_LEN;
@@ -8654,9 +8688,15 @@
 		have_80mhz = true;
 		break;
 	}
+	
+	//get operating mode notification capable element
+	const u8* extended_cap_ie = ieee80211_bss_get_ie(cbss,WLAN_EID_EXT_CAPABILITY);
+	if ( (extended_cap_ie)  && (extended_cap_ie[1] >= 8) && 
+			(extended_cap_ie[9] & WLAN_EXT_CAPA8_OPMODE_NOTIF))
+			operating_mode_notif_capable = true;
 
-	if (!have_80mhz) {
-		sdata_info(sdata, "80 MHz not supported, disabling VHT\n");
+	if ((!have_80mhz) && (!operating_mode_notif_capable)) {
+		sdata_info(sdata, "80 MHz not supported nor operating mode notification capable, disabling VHT\n");
 		*conn_flags |= IEEE80211_CONN_DISABLE_VHT;
 	}

然后、我从 https://github.com/TexasInstruments-Sandbox/cc33xx-linux-mpu-ports/blob/main/5.10.y/backport.patch 为 5.10.y 应用了特定的反向端口.patch。

虽然修补程序工作正常、但与 cc33xx_kernel.patch 相比、我还发现一些代码被忽略。

我想确认以下代码对于 5.10.y 是否不必要？

+		//Add operation mode notification element when operating at 20 MHz bandwidth
+		if(chanctx_conf->def.width == NL80211_CHAN_WIDTH_20)
+		{
+			/*  Operating Mode Notification element */
+			rx_nss = 0;
+			rx_nss_type= 0;
+			opmode_notif |= IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ; 
+			rx_nss <<= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
+			rx_nss_type <<= (IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT + 3);
+			opmode_notif |= rx_nss;
+			opmode_notif |= rx_nss_type;
+
+			pos = skb_put(skb, 2 + sizeof(u8));
+
+			*pos++ = WLAN_EID_OPMODE_NOTIF;
+			*pos++ = sizeof(u8);
+			*pos++ = opmode_notif;
+		}
+

@@ -8654,9 +8688,15 @@
 		have_80mhz = true;
 		break;
 	}
+	
+	//get operating mode notification capable element
+	const u8* extended_cap_ie = ieee80211_bss_get_ie(cbss,WLAN_EID_EXT_CAPABILITY);
+	if ( (extended_cap_ie)  && (extended_cap_ie[1] >= 8) && 
+			(extended_cap_ie[9] & WLAN_EXT_CAPA8_OPMODE_NOTIF))
+			operating_mode_notif_capable = true;
 
-	if (!have_80mhz) {
-		sdata_info(sdata, "80 MHz not supported, disabling VHT\n");
+	if ((!have_80mhz) && (!operating_mode_notif_capable)) {
+		sdata_info(sdata, "80 MHz not supported nor operating mode notification capable, disabling VHT\n");
 		*conn_flags |= IEEE80211_CONN_DISABLE_VHT;
 	}

3 个月前