From patchwork Fri Jun 16 03:17:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ping-Ke Shih X-Patchwork-Id: 694001 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7232FEB64D9 for ; Fri, 16 Jun 2023 03:18:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232947AbjFPDSj (ORCPT ); Thu, 15 Jun 2023 23:18:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241365AbjFPDSB (ORCPT ); Thu, 15 Jun 2023 23:18:01 -0400 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BDD5F30E6 for ; Thu, 15 Jun 2023 20:17:52 -0700 (PDT) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 35G3HN6x8032026, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36505.realtek.com.tw[172.21.6.25]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 35G3HN6x8032026 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=OK); Fri, 16 Jun 2023 11:17:23 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36505.realtek.com.tw (172.21.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.32; Fri, 16 Jun 2023 11:17:42 +0800 Received: from [127.0.1.1] (172.21.69.188) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Fri, 16 Jun 2023 11:17:42 +0800 From: Ping-Ke Shih To: , CC: , Subject: [PATCH] wifi: rtw88: process VO packets without workqueue to avoid PTK rekey failed Date: Fri, 16 Jun 2023 11:17:13 +0800 Message-ID: <20230616031713.16769-1-pkshih@realtek.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [172.21.69.188] X-ClientProxiedBy: RTEXMBS02.realtek.com.tw (172.21.6.95) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: fallback X-KSE-Antivirus-Interceptor-Info: fallback X-KSE-AntiSpam-Interceptor-Info: fallback X-KSE-ServerInfo: RTEXH36505.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: fallback X-KSE-Antivirus-Interceptor-Info: fallback X-KSE-AntiSpam-Interceptor-Info: fallback Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Chih-Kang Chang In the wpa_supplicant rekey flow, it sends an EAPOL packet 4/4 through nl80211_tx_control_port() and triggers wake_tx_queue() in the driver. Then, it sends nl80211_new_key() to configure a new key in mac80211. However, in wake_tx_queue(), a workqueue is used to process the tx packet, which might cause the driver to process the EAPOL packet later than nl80211_new_key(). As a result, the EAPOL 4/4 packet is dropped by mac80211 due to the rekey configuration being finished. The EAPOL packets belongs to VO packets that need high priority. Therefore, we process VO packets directly without workqueue to ensure that packets can process immediately. VO is normally used by voice application that is low traffic load and low latency, that doesn't affect user experience. We test iperf with VO packets(iperf3 -P4 -u -b 10000M -S 0xdf) before after TX throughput 162M 162M ping RTT 3.8ms 3.7ms Signed-off-by: Chih-Kang Chang Signed-off-by: Ping-Ke Shih --- drivers/net/wireless/realtek/rtw88/mac80211.c | 6 +++++- drivers/net/wireless/realtek/rtw88/tx.c | 10 ++++++++-- drivers/net/wireless/realtek/rtw88/tx.h | 1 + 3 files changed, 14 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/mac80211.c b/drivers/net/wireless/realtek/rtw88/mac80211.c index 09bcc2345bb05..4241027902832 100644 --- a/drivers/net/wireless/realtek/rtw88/mac80211.c +++ b/drivers/net/wireless/realtek/rtw88/mac80211.c @@ -43,7 +43,11 @@ static void rtw_ops_wake_tx_queue(struct ieee80211_hw *hw, list_add_tail(&rtwtxq->list, &rtwdev->txqs); spin_unlock_bh(&rtwdev->txq_lock); - queue_work(rtwdev->tx_wq, &rtwdev->tx_work); + /* ensure to dequeue EAPOL (4/4) at the right time */ + if (txq->ac == IEEE80211_AC_VO) + __rtw_tx_work(rtwdev); + else + queue_work(rtwdev->tx_wq, &rtwdev->tx_work); } static int rtw_ops_start(struct ieee80211_hw *hw) diff --git a/drivers/net/wireless/realtek/rtw88/tx.c b/drivers/net/wireless/realtek/rtw88/tx.c index bb5c7492c98b0..b6c97a986a1ac 100644 --- a/drivers/net/wireless/realtek/rtw88/tx.c +++ b/drivers/net/wireless/realtek/rtw88/tx.c @@ -635,9 +635,8 @@ static void rtw_txq_push(struct rtw_dev *rtwdev, rcu_read_unlock(); } -void rtw_tx_work(struct work_struct *w) +void __rtw_tx_work(struct rtw_dev *rtwdev) { - struct rtw_dev *rtwdev = container_of(w, struct rtw_dev, tx_work); struct rtw_txq *rtwtxq, *tmp; spin_lock_bh(&rtwdev->txq_lock); @@ -658,6 +657,13 @@ void rtw_tx_work(struct work_struct *w) spin_unlock_bh(&rtwdev->txq_lock); } +void rtw_tx_work(struct work_struct *w) +{ + struct rtw_dev *rtwdev = container_of(w, struct rtw_dev, tx_work); + + __rtw_tx_work(rtwdev); +} + void rtw_txq_init(struct rtw_dev *rtwdev, struct ieee80211_txq *txq) { struct rtw_txq *rtwtxq; diff --git a/drivers/net/wireless/realtek/rtw88/tx.h b/drivers/net/wireless/realtek/rtw88/tx.h index 197d5868c8ad9..544133643a1bb 100644 --- a/drivers/net/wireless/realtek/rtw88/tx.h +++ b/drivers/net/wireless/realtek/rtw88/tx.h @@ -111,6 +111,7 @@ void rtw_tx(struct rtw_dev *rtwdev, void rtw_txq_init(struct rtw_dev *rtwdev, struct ieee80211_txq *txq); void rtw_txq_cleanup(struct rtw_dev *rtwdev, struct ieee80211_txq *txq); void rtw_tx_work(struct work_struct *w); +void __rtw_tx_work(struct rtw_dev *rtwdev); void rtw_tx_pkt_info_update(struct rtw_dev *rtwdev, struct rtw_tx_pkt_info *pkt_info, struct ieee80211_sta *sta,