From patchwork Sat Oct 23 00:39:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Li X-Patchwork-Id: 12579229 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7FCB9C433EF for ; Sat, 23 Oct 2021 00:40:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 650CC60F93 for ; Sat, 23 Oct 2021 00:40:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232626AbhJWAma (ORCPT ); Fri, 22 Oct 2021 20:42:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232545AbhJWAm2 (ORCPT ); Fri, 22 Oct 2021 20:42:28 -0400 Received: from mail-il1-x136.google.com (mail-il1-x136.google.com [IPv6:2607:f8b0:4864:20::136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A602FC061767 for ; Fri, 22 Oct 2021 17:40:09 -0700 (PDT) Received: by mail-il1-x136.google.com with SMTP id a8so6021961ilj.10 for ; Fri, 22 Oct 2021 17:40:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=squareup.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=CpY5YvAdI88mEgTssdajQ0m3zcXKz4URVV+QOXC/Psg=; b=VlINocpShO4JR2wYePuwlwKsZPdwBrjouwtL4GJypO6FreYqyAuZwbbjXLNEpqE8cL EKkRH5tGk7KVwUJweiPakGMiAMjcHTCu/lWTFLvl24m2aHNhBCIIVLigKfjWrw0Fwzmb nu5gGCzC1Sg32Sq+Ir1skyeUWt/ZLv/ci6cUs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=CpY5YvAdI88mEgTssdajQ0m3zcXKz4URVV+QOXC/Psg=; b=791PDYPImIHcPqqeLw7SilUqmMBww8Ina9hY1rrxuHlwbhZnnOoXjO0/+oLZ1hdg8f 2yWSyhdBeR9NBs8FL2oj/9NZIF5mUxpeRd6W4A2pRDCKvnqkzzxrTnXdpunz2LkCW0tP susJJ9q2L531m1KSTxII6q7w9S2/vnS2qnTKnMgGqb8UsZ32eyr4XMNuReEB3TlZ0idF 6GYN76Mq7f/1MTw6yxLfHs9mSMLT1kGxHOJyP8u1h7wNVsd/mzfW6reJXvszE6BXfVOx W6r/nZ0mpLnlt9T/g0Zj5I1Vne/FAonUaUrPX/aFZ9+Vkf62jBoA5NuM23ju4+CFM+Jg EecQ== X-Gm-Message-State: AOAM533qHl6uWV7cgvSA8F2v2IUmfuCxoljopJVzj4NJzDA3iD5CNhgp Z/SpIi/RxGMjs5VjKlDYaRgo8A== X-Google-Smtp-Source: ABdhPJyqAioSuiNA6gyq8L25PoMRsoa2slBy5PTrS9tx9fJG4ydmejds7bkrZRXCWX3LzVXBL3WzPg== X-Received: by 2002:a05:6e02:1b09:: with SMTP id i9mr1833998ilv.142.1634949609106; Fri, 22 Oct 2021 17:40:09 -0700 (PDT) Received: from localhost ([2600:6c50:4d00:cd01::382]) by smtp.gmail.com with ESMTPSA id k16sm4945474ior.50.2021.10.22.17.40.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 Oct 2021 17:40:08 -0700 (PDT) From: Benjamin Li To: Kalle Valo Cc: Joseph Gates , Bryan O'Donoghue , Loic Poulain , linux-arm-msm@vger.kernel.org, Benjamin Li , "David S. Miller" , Jakub Kicinski , Eugene Krasnikov , "John W. Linville" , wcn36xx@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] wcn36xx: add debug prints for sw_scan start/complete Date: Fri, 22 Oct 2021 17:39:46 -0700 Message-Id: <20211023003949.3082900-2-benl@squareup.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211023003949.3082900-1-benl@squareup.com> References: <20211023003949.3082900-1-benl@squareup.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add some MAC debug prints for more easily demarcating a software scan when parsing logs. Signed-off-by: Benjamin Li --- drivers/net/wireless/ath/wcn36xx/main.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c index 263af65a889ab..81ac86eeaf60b 100644 --- a/drivers/net/wireless/ath/wcn36xx/main.c +++ b/drivers/net/wireless/ath/wcn36xx/main.c @@ -711,6 +711,8 @@ static void wcn36xx_sw_scan_start(struct ieee80211_hw *hw, struct wcn36xx *wcn = hw->priv; struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif); + wcn36xx_dbg(WCN36XX_DBG_MAC, "sw_scan_start"); + wcn->sw_scan = true; wcn->sw_scan_vif = vif; wcn->sw_scan_channel = 0; @@ -725,6 +727,8 @@ static void wcn36xx_sw_scan_complete(struct ieee80211_hw *hw, { struct wcn36xx *wcn = hw->priv; + wcn36xx_dbg(WCN36XX_DBG_MAC, "sw_scan_complete"); + /* ensure that any scan session is finished */ wcn36xx_smd_finish_scan(wcn, HAL_SYS_MODE_SCAN, wcn->sw_scan_vif); wcn->sw_scan = false; From patchwork Sat Oct 23 00:39:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Li X-Patchwork-Id: 12579231 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 56C48C4332F for ; Sat, 23 Oct 2021 00:40:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 42F2C60FC4 for ; Sat, 23 Oct 2021 00:40:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232263AbhJWAmf (ORCPT ); Fri, 22 Oct 2021 20:42:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50092 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232673AbhJWAmc (ORCPT ); Fri, 22 Oct 2021 20:42:32 -0400 Received: from mail-il1-x12a.google.com (mail-il1-x12a.google.com [IPv6:2607:f8b0:4864:20::12a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A269C061766 for ; Fri, 22 Oct 2021 17:40:14 -0700 (PDT) Received: by mail-il1-x12a.google.com with SMTP id l7so6042817iln.8 for ; Fri, 22 Oct 2021 17:40:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=squareup.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=RpFO/O8OJtCCTXoNPY6I7vBtlJtuEAebpHNwcVp0mrs=; b=eGRxqCs470PqWufr+LBwbmCqk4jplUIcjZEiiDcmwk7hfArmQOqmBx96+lfQjRUBkT WpFxJwYG0oFHv7Jk5Em6LZ5YClfBy3gxaxY0Mhh//4RpLRXl7pwYsVDL5xFre1LGf1f4 AVV4Z8kjcITfXwgMd/aeO9IXNyydC1L6aND/U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=RpFO/O8OJtCCTXoNPY6I7vBtlJtuEAebpHNwcVp0mrs=; b=vm38+KlqV5BOjL4rNvqDzFU6bU5ESiCX5pfa76Sp5vj/jDHcvB1N7DlE3uV/DlixNd /ulFeh+68qYox6na3HZ55kZWBIN/lCkYLiaWXWXFuV/1NsyEyEMqKuvHuF3r/pjQ48Be 4J7IFCYmBnEMAWfxiPgBlGVV1Fgzphe+falQhhb3bAhXi+oUOQb4Vs35MR3wgzvhVX5m 6xydLgkKv0qAZsCSsWRzqzhDpY2xNzu6g8Ul2EmvzN+0Y2mWZbtheW3g2uTH/YO/c8zz bcpYdJE3GEHHPckIBmcSahef228c8qRcAAVeDK3nnvHcHd0hpoJtW1uJ3CuWkkB7uFF7 0ZAw== X-Gm-Message-State: AOAM533CLuRwjJcV/QkpH0e81ZjdcV80L9Ig7y1gPRlicboONUyCFeM4 uYMsTmEhDpWBLz05j4Lu90llvA== X-Google-Smtp-Source: ABdhPJwdXiQmYkDN0aV5a+y49XXFI/iSmA+a2vItLSezpw39bYgk/Le3YtZnTauxjBQ1DbydkOX2uQ== X-Received: by 2002:a92:c56c:: with SMTP id b12mr1870927ilj.45.1634949613566; Fri, 22 Oct 2021 17:40:13 -0700 (PDT) Received: from localhost ([2600:6c50:4d00:cd01::382]) by smtp.gmail.com with ESMTPSA id y6sm4689189iol.11.2021.10.22.17.40.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 Oct 2021 17:40:13 -0700 (PDT) From: Benjamin Li To: Kalle Valo Cc: Joseph Gates , Bryan O'Donoghue , Loic Poulain , linux-arm-msm@vger.kernel.org, Benjamin Li , "David S. Miller" , Jakub Kicinski , Eugene Krasnikov , "John W. Linville" , wcn36xx@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] wcn36xx: implement flush op to speed up connected scan Date: Fri, 22 Oct 2021 17:39:47 -0700 Message-Id: <20211023003949.3082900-3-benl@squareup.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211023003949.3082900-1-benl@squareup.com> References: <20211023003949.3082900-1-benl@squareup.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Without ieee80211_ops->flush implemented to empty HW queues, mac80211 will do a 100ms dead wait after stopping SW queues, before leaving the operating channel to resume a software connected scan[1]. (see ieee80211_scan_state_resume) This wait is correctly included in the calculation for whether or not we've exceeded max off-channel time, as it occurs after sending the null frame with PS bit set. Thus, with 125 ms max off-channel time we only have 25 ms of scan time, which technically isn't even enough to scan one channel (although mac80211 always scans at least one channel per off- channel window). Moreover, for passive probes we end up spending at least 100 ms + 111 ms (IEEE80211_PASSIVE_CHANNEL_TIME) "off-channel"[2], which exceeds the listen interval of 200 ms that we provide in our association request frame. That's technically out-of-spec. [1]: Until recently, wcn36xx performed software (rather than FW-offloaded) scanning when 5GHz channels are requested. This apparent limitation is now resolved -- see commit 1395f8a6a4d5 ("wcn36xx: Enable hardware scan offload for 5Ghz band"). [2]: in quotes because about 100 ms of it is still on-channel but with PS set Signed-off-by: Benjamin Li --- drivers/net/wireless/ath/wcn36xx/dxe.c | 47 +++++++++++++++++++++++++ drivers/net/wireless/ath/wcn36xx/dxe.h | 1 + drivers/net/wireless/ath/wcn36xx/main.c | 11 ++++++ 3 files changed, 59 insertions(+) diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.c b/drivers/net/wireless/ath/wcn36xx/dxe.c index 8e1dbfda65386..c4e9e939d7d6d 100644 --- a/drivers/net/wireless/ath/wcn36xx/dxe.c +++ b/drivers/net/wireless/ath/wcn36xx/dxe.c @@ -831,6 +831,53 @@ int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn, return ret; } +static bool _wcn36xx_dxe_tx_channel_is_empty(struct wcn36xx_dxe_ch *ch) +{ + int flags; + struct wcn36xx_dxe_ctl *ctl_bd_start, *ctl_skb_start; + struct wcn36xx_dxe_ctl *ctl_bd, *ctl_skb; + bool ret = true; + + spin_lock_irqsave(&ch->lock, flags); + + /* Loop through ring buffer looking for nonempty entries. */ + ctl_bd_start = ch->head_blk_ctl; + ctl_bd = ctl_bd_start; + ctl_skb_start = ctl_bd_start->next; + ctl_skb = ctl_skb_start; + do { + if (ctl_skb->skb) { + ret = false; + goto unlock; + } + ctl_bd = ctl_skb->next; + ctl_skb = ctl_bd->next; + } while (ctl_skb != ctl_skb_start); + +unlock: + spin_unlock_irqrestore(&ch->lock, flags); + return ret; +} + +int wcn36xx_dxe_tx_flush(struct wcn36xx *wcn) +{ + int i = 0; + + /* Called with mac80211 queues stopped. Wait for empty HW queues. */ + do { + if (_wcn36xx_dxe_tx_channel_is_empty(&wcn->dxe_tx_l_ch) && + _wcn36xx_dxe_tx_channel_is_empty(&wcn->dxe_tx_h_ch)) { + return 0; + } + /* This ieee80211_ops callback is specifically allowed to + * sleep. + */ + usleep_range(1000, 1100); + } while (++i < 100); + + return -EBUSY; +} + int wcn36xx_dxe_init(struct wcn36xx *wcn) { int reg_data = 0, ret; diff --git a/drivers/net/wireless/ath/wcn36xx/dxe.h b/drivers/net/wireless/ath/wcn36xx/dxe.h index 31b81b7547a32..26a31edf52e99 100644 --- a/drivers/net/wireless/ath/wcn36xx/dxe.h +++ b/drivers/net/wireless/ath/wcn36xx/dxe.h @@ -466,5 +466,6 @@ int wcn36xx_dxe_tx_frame(struct wcn36xx *wcn, struct wcn36xx_tx_bd *bd, struct sk_buff *skb, bool is_low); +int wcn36xx_dxe_tx_flush(struct wcn36xx *wcn); void wcn36xx_dxe_tx_ack_ind(struct wcn36xx *wcn, u32 status); #endif /* _DXE_H_ */ diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c index 81ac86eeaf60b..24bfb30a30f31 100644 --- a/drivers/net/wireless/ath/wcn36xx/main.c +++ b/drivers/net/wireless/ath/wcn36xx/main.c @@ -1275,6 +1275,16 @@ static void wcn36xx_ipv6_addr_change(struct ieee80211_hw *hw, } #endif +static void wcn36xx_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif, + u32 queues, bool drop) +{ + struct wcn36xx *wcn = hw->priv; + + if (wcn36xx_dxe_tx_flush(wcn)) { + wcn36xx_err("Failed to flush hardware tx queues\n"); + } +} + static const struct ieee80211_ops wcn36xx_ops = { .start = wcn36xx_start, .stop = wcn36xx_stop, @@ -1302,6 +1312,7 @@ static const struct ieee80211_ops wcn36xx_ops = { #if IS_ENABLED(CONFIG_IPV6) .ipv6_addr_change = wcn36xx_ipv6_addr_change, #endif + .flush = wcn36xx_flush, CFG80211_TESTMODE_CMD(wcn36xx_tm_cmd) }; From patchwork Sat Oct 23 00:39:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Li X-Patchwork-Id: 12579233 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD8EBC433EF for ; Sat, 23 Oct 2021 00:40:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B040460FE7 for ; Sat, 23 Oct 2021 00:40:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232710AbhJWAmm (ORCPT ); Fri, 22 Oct 2021 20:42:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50124 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232734AbhJWAmh (ORCPT ); Fri, 22 Oct 2021 20:42:37 -0400 Received: from mail-io1-xd29.google.com (mail-io1-xd29.google.com [IPv6:2607:f8b0:4864:20::d29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 792F2C061767 for ; Fri, 22 Oct 2021 17:40:19 -0700 (PDT) Received: by mail-io1-xd29.google.com with SMTP id b188so7481192iof.8 for ; Fri, 22 Oct 2021 17:40:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=squareup.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=C7/+pikxNRy4utznLJ1GiAXOsGjI/jsCBsKgU2eHpJE=; b=V9pQ1gdA4FbAl8sT3PDEvRomNk9b6LKpNr/J/7h9pEIcwwe+t2HFze1Nojw54bEdWk bQ0LNAAwEev520J/K3VX9klbZ5vEJvBSYVfpe65KesoCZtK5PHxXFRRV9SWA2yRu2Rxf sNVQ65fqObhh7ajxDBkCNtdSHRKzgM9YamVGg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=C7/+pikxNRy4utznLJ1GiAXOsGjI/jsCBsKgU2eHpJE=; b=4DfTzOWRiQXYQ+6YNCD4qol3fENkBr8g5pmE/nO8JuBvZLhUwfVBmvgwQTroW5W1fM Abfq1svqArH1LLwa9i7aOjsl3d3aoB5HUbHfZTkUnOAoKy2XvOvw1/Xq50RpmCrC3GNw LP2eO1pge66SSrrKGHiEGVUMBygSCwaPuP9fUXH1gVAft0FaBIiXFEerj1bUEwjvWwi4 Tup20dGj6za9LKHuC/EZYrHyL+uj0wKFnqQSCR1AEJue8Ah2wKzVZUp4kRKVhotBIvYn JxayhWPhVy9NsuXsL3D8rfMavPM3STh7zxUuSpMt+5PchlHdqm5P7qBahE8ox65dIyeV buRw== X-Gm-Message-State: AOAM530wBzRIgUCQbLOpIEoyTh5oIyn1zb1SxJQK9tcWDwJiDqVW8S3i ioVDKf1oflzmWJqEWNAbCh06oQ== X-Google-Smtp-Source: ABdhPJyVUYYhyVPmfRjjW1+I05tdVyKnr5xjcJUeDrdDLnnA0+NSFzvZ2q/DM3SydPRIOwuR0H20Ww== X-Received: by 2002:a5d:8183:: with SMTP id u3mr1780384ion.67.1634949618829; Fri, 22 Oct 2021 17:40:18 -0700 (PDT) Received: from localhost ([2600:6c50:4d00:cd01::382]) by smtp.gmail.com with ESMTPSA id s10sm5092073ild.78.2021.10.22.17.40.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 Oct 2021 17:40:18 -0700 (PDT) From: Benjamin Li To: Kalle Valo Cc: Joseph Gates , Bryan O'Donoghue , Loic Poulain , linux-arm-msm@vger.kernel.org, Benjamin Li , "David S. Miller" , Jakub Kicinski , Eugene Krasnikov , "John W. Linville" , wcn36xx@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] wcn36xx: ensure pairing of init_scan/finish_scan and start_scan/end_scan Date: Fri, 22 Oct 2021 17:39:48 -0700 Message-Id: <20211023003949.3082900-4-benl@squareup.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211023003949.3082900-1-benl@squareup.com> References: <20211023003949.3082900-1-benl@squareup.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org An SMD capture from the downstream prima driver on WCN3680B shows the following command sequence for connected scans: - init_scan_req - start_scan_req, channel 1 - end_scan_req, channel 1 - start_scan_req, channel 2 - ... - end_scan_req, channel 3 - finish_scan_req - init_scan_req - start_scan_req, channel 4 - ... - end_scan_req, channel 6 - finish_scan_req - ... - end_scan_req, channel 165 - finish_scan_req Upstream currently never calls wcn36xx_smd_end_scan, and in some cases[1] still sends finish_scan_req twice in a row or before init_scan_req. A typical connected scan looks like this: - init_scan_req - start_scan_req, channel 1 - finish_scan_req - init_scan_req - start_scan_req, channel 2 - ... - start_scan_req, channel 165 - finish_scan_req - finish_scan_req This patch cleans up scanning so that init/finish and start/end are always paired together and correctly nested. - init_scan_req - start_scan_req, channel 1 - end_scan_req, channel 1 - finish_scan_req - init_scan_req - start_scan_req, channel 2 - end_scan_req, channel 2 - ... - start_scan_req, channel 165 - end_scan_req, channel 165 - finish_scan_req Note that upstream will not do batching of 3 active-probe scans before returning to the operating channel, and this patch does not change that. To match downstream in this aspect, adjust IEEE80211_PROBE_DELAY and/or the 125ms max off-channel time in ieee80211_scan_state_decision. [1]: commit d195d7aac09b ("wcn36xx: Ensure finish scan is not requested before start scan") addressed one case of finish_scan_req being sent without a preceding init_scan_req (the case of the operating channel coinciding with the first scan channel); two other cases are: 1) if SW scan is started and aborted immediately, without scanning any channels, we send a finish_scan_req without ever sending init_scan_req, and 2) as SW scan logic always returns us to the operating channel before calling wcn36xx_sw_scan_complete, finish_scan_req is always sent twice at the end of a SW scan Fixes: 8e84c2582169 ("wcn36xx: mac80211 driver for Qualcomm WCN3660/WCN3680 hardware") Signed-off-by: Benjamin Li --- drivers/net/wireless/ath/wcn36xx/main.c | 34 +++++++++++++++++----- drivers/net/wireless/ath/wcn36xx/smd.c | 4 +++ drivers/net/wireless/ath/wcn36xx/wcn36xx.h | 1 + 3 files changed, 32 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/ath/wcn36xx/main.c b/drivers/net/wireless/ath/wcn36xx/main.c index 24bfb30a30f31..a6f4a22417b36 100644 --- a/drivers/net/wireless/ath/wcn36xx/main.c +++ b/drivers/net/wireless/ath/wcn36xx/main.c @@ -398,6 +398,7 @@ static void wcn36xx_change_opchannel(struct wcn36xx *wcn, int ch) static int wcn36xx_config(struct ieee80211_hw *hw, u32 changed) { struct wcn36xx *wcn = hw->priv; + int ret; wcn36xx_dbg(WCN36XX_DBG_MAC, "mac config changed 0x%08x\n", changed); @@ -413,17 +414,31 @@ static int wcn36xx_config(struct ieee80211_hw *hw, u32 changed) * want to receive/transmit regular data packets, then * simply stop the scan session and exit PS mode. */ - wcn36xx_smd_finish_scan(wcn, HAL_SYS_MODE_SCAN, - wcn->sw_scan_vif); - wcn->sw_scan_channel = 0; + if (wcn->sw_scan_channel) + wcn36xx_smd_end_scan(wcn, wcn->sw_scan_channel); + if (wcn->sw_scan_init) { + wcn36xx_smd_finish_scan(wcn, HAL_SYS_MODE_SCAN, + wcn->sw_scan_vif); + } } else if (wcn->sw_scan) { /* A scan is ongoing, do not change the operating * channel, but start a scan session on the channel. */ - wcn36xx_smd_init_scan(wcn, HAL_SYS_MODE_SCAN, - wcn->sw_scan_vif); + if (wcn->sw_scan_channel) + wcn36xx_smd_end_scan(wcn, wcn->sw_scan_channel); + if (!wcn->sw_scan_init) { + /* This can fail if we are unable to notify the + * operating channel. + */ + ret = wcn36xx_smd_init_scan(wcn, + HAL_SYS_MODE_SCAN, + wcn->sw_scan_vif); + if (ret) { + mutex_unlock(&wcn->conf_mutex); + return -EIO; + } + } wcn36xx_smd_start_scan(wcn, ch); - wcn->sw_scan_channel = ch; } else { wcn36xx_change_opchannel(wcn, ch); } @@ -730,7 +745,12 @@ static void wcn36xx_sw_scan_complete(struct ieee80211_hw *hw, wcn36xx_dbg(WCN36XX_DBG_MAC, "sw_scan_complete"); /* ensure that any scan session is finished */ - wcn36xx_smd_finish_scan(wcn, HAL_SYS_MODE_SCAN, wcn->sw_scan_vif); + if (wcn->sw_scan_channel) + wcn36xx_smd_end_scan(wcn, wcn->sw_scan_channel); + if (wcn->sw_scan_init) { + wcn36xx_smd_finish_scan(wcn, HAL_SYS_MODE_SCAN, + wcn->sw_scan_vif); + } wcn->sw_scan = false; wcn->sw_scan_opchannel = 0; } diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c index 3979171c92dd2..e0de5da31158c 100644 --- a/drivers/net/wireless/ath/wcn36xx/smd.c +++ b/drivers/net/wireless/ath/wcn36xx/smd.c @@ -720,6 +720,7 @@ int wcn36xx_smd_init_scan(struct wcn36xx *wcn, enum wcn36xx_hal_sys_mode mode, wcn36xx_err("hal_init_scan response failed err=%d\n", ret); goto out; } + wcn->sw_scan_init = true; out: mutex_unlock(&wcn->hal_mutex); return ret; @@ -750,6 +751,7 @@ int wcn36xx_smd_start_scan(struct wcn36xx *wcn, u8 scan_channel) wcn36xx_err("hal_start_scan response failed err=%d\n", ret); goto out; } + wcn->sw_scan_channel = scan_channel; out: mutex_unlock(&wcn->hal_mutex); return ret; @@ -780,6 +782,7 @@ int wcn36xx_smd_end_scan(struct wcn36xx *wcn, u8 scan_channel) wcn36xx_err("hal_end_scan response failed err=%d\n", ret); goto out; } + wcn->sw_scan_channel = 0; out: mutex_unlock(&wcn->hal_mutex); return ret; @@ -821,6 +824,7 @@ int wcn36xx_smd_finish_scan(struct wcn36xx *wcn, wcn36xx_err("hal_finish_scan response failed err=%d\n", ret); goto out; } + wcn->sw_scan_init = false; out: mutex_unlock(&wcn->hal_mutex); return ret; diff --git a/drivers/net/wireless/ath/wcn36xx/wcn36xx.h b/drivers/net/wireless/ath/wcn36xx/wcn36xx.h index add6e527e8330..d2a2769673716 100644 --- a/drivers/net/wireless/ath/wcn36xx/wcn36xx.h +++ b/drivers/net/wireless/ath/wcn36xx/wcn36xx.h @@ -247,6 +247,7 @@ struct wcn36xx { struct cfg80211_scan_request *scan_req; bool sw_scan; u8 sw_scan_opchannel; + bool sw_scan_init; u8 sw_scan_channel; struct ieee80211_vif *sw_scan_vif; struct mutex scan_lock;