From patchwork Sun Sep 18 19:20:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 607301 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 21A20C32771 for ; Sun, 18 Sep 2022 19:21:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229501AbiIRTVK (ORCPT ); Sun, 18 Sep 2022 15:21:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34154 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229473AbiIRTVI (ORCPT ); Sun, 18 Sep 2022 15:21:08 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5BDED15FE4 for ; Sun, 18 Sep 2022 12:21:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1663528866; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=uOzXnE7V620ExmXecsTAdqAqQObBZ3En/vJphIYBVeQ=; b=Y0INYyd2fSVNFknwqP/2ZGIsVJ9YwpLDT/2BeM+uxpEsftNBU+Mf1sHzysXpbgtNEiStv6 0KNYTGQplcSkUSCHvL2yoPo0ZgIDxBgGXUKWvbHDnlD0er71ke/r+3wRicKdTkeRlLHKou YeHv7w2A8wl3YMPERQ2f5FFE8TN9vGM= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-464-mdfkfUN1Mp-oEybs1U6OlQ-1; Sun, 18 Sep 2022 15:21:03 -0400 X-MC-Unique: mdfkfUN1Mp-oEybs1U6OlQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AD4A738041C6; Sun, 18 Sep 2022 19:21:02 +0000 (UTC) Received: from localhost.localdomain (unknown [10.39.192.73]) by smtp.corp.redhat.com (Postfix) with ESMTP id A2C7B2166B26; Sun, 18 Sep 2022 19:21:01 +0000 (UTC) From: Hans de Goede To: Johannes Berg Cc: Hans de Goede , Helmut Schaa , linux-wireless@vger.kernel.org, Markus Theil , Stanislaw Gruszka Subject: [PATCH] mac80211: Fix regression caused by 'enable QoS support for nl80211 ctrl port' Date: Sun, 18 Sep 2022 21:20:52 +0200 Message-Id: <20220918192052.443529-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Commit 10cb8e617560 ("mac80211: enable QoS support for nl80211 ctrl port") changed ieee80211_tx_control_port() to aways call __ieee80211_select_queue() without checking local->hw.queues. __ieee80211_select_queue() returns a queue-id between 0 and 3, which means that now ieee80211_tx_control_port() may end up setting the queue-mapping for a skb to a value higher then local->hw.queues if local->hw.queues is less then 4. Specifically this is a problem for ralink rt2500-pci cards where local->hw.queues is 2. There this causes rt2x00queue_get_tx_queue() to return NULL and the following error to be logged: "ieee80211 phy0: rt2x00mac_tx: Error - Attempt to send packet over invalid queue 2", after which association with the AP fails. Other callers of __ieee80211_select_queue() skip calling it when local->hw.queues < IEEE80211_NUM_ACS, add the same check to ieee80211_tx_control_port(). This fixes ralink rt2500-pci and similar cards when less then 4 tx-queues no longer working. Fixes: 10cb8e617560 ("mac80211: enable QoS support for nl80211 ctrl port") Cc: Markus Theil Suggested-by: Stanislaw Gruszka Signed-off-by: Hans de Goede --- net/mac80211/tx.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index bf7fe6cd9dfc..13249e97a069 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -5878,6 +5878,9 @@ int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, skb_reset_network_header(skb); skb_reset_mac_header(skb); + if (local->hw.queues < IEEE80211_NUM_ACS) + goto start_xmit; + /* update QoS header to prioritize control port frames if possible, * priorization also happens for control port frames send over * AF_PACKET @@ -5905,6 +5908,7 @@ int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev, } rcu_read_unlock(); +start_xmit: /* mutex lock is only needed for incrementing the cookie counter */ mutex_lock(&local->mtx);