From patchwork Tue Sep 20 15:55:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Wetzel X-Patchwork-Id: 607938 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 B3B5AECAAD8 for ; Tue, 20 Sep 2022 15:56:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231524AbiITP4K (ORCPT ); Tue, 20 Sep 2022 11:56:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231540AbiITP4I (ORCPT ); Tue, 20 Sep 2022 11:56:08 -0400 Received: from ns2.wdyn.eu (ns2.wdyn.eu [IPv6:2a03:4000:40:5b2::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id D0CA36BCC0 for ; Tue, 20 Sep 2022 08:56:05 -0700 (PDT) From: Alexander Wetzel DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=wetzel-home.de; s=wetzel-home; t=1663689362; bh=Arz06mzgnmfqzaWy5jmbXz3GvPJY8+rQZORoX2NT0BU=; h=From:To:Cc:Subject:Date; b=K0g8uohYA3v3iQPaXG+8bPeKhi+PcEDxCiTOfBXntRsWSKOwjxSMISTZEmSYNygNs M9TnBRbIFd87MRWyuYbgsnLxdsaWrVF2qP31hgW5FrsVbQs+yMMBbhPiWE+GDBIczX RUmyWEUUmHerWJCtRLtwn2+izJgWONRCxj0j1Sos= To: linux-wireless@vger.kernel.org Cc: Johannes Berg , Alexander Wetzel Subject: [PATCH] wifi: mac80211: netdev compatible TX stop for iTXQ drivers Date: Tue, 20 Sep 2022 17:55:41 +0200 Message-Id: <20220920155541.2942-1-alexander@wetzel-home.de> X-Mailer: git-send-email 2.37.3 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Properly handle TX stop for internal queues (iTXQs) within mac80211. mac80211 must not stop netdev queues when using mac80211 iTXQs. For these drivers the netdev interface is created with IFF_NO_QUEUE. While netdev still drops frames for IFF_NO_QUEUE interfaces when we stop the netdev queues, it also prints a warning when this happens: Assuming the mac80211 interface is called wlan0 we would get "Virtual device wlan0 asks to queue packet!" when netdev has to drop a frame. This patch is keeping the harmless netdev queue starts for iTXQ drivers. Signed-off-by: Alexander Wetzel --- This is another issue I tripped over while working on the patch to move all drivers to iTXQ. Didn't want to hide that in the "switch all to iTXQ" patch. (Which will simply remove all netdev queue starts and stops.) When running the hwsim tests from hostapd with my WIP patches, I always got a few "Virtual device XXXX asks to queue packet!" warnings from netdev. (The offending packets were all from an ipv6 tasklet and looked like some kind of race for me: While I always would get the message I did not find a test to do it reproducible.) --- net/mac80211/iface.c | 6 +++--- net/mac80211/tx.c | 10 ++++++---- 2 files changed, 9 insertions(+), 7 deletions(-) diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 572254366a0f..5d7f25ed7a0e 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -461,7 +461,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_do /* * Stop TX on this interface first. */ - if (sdata->dev) + if (!local->ops->wake_tx_queue && sdata->dev) netif_tx_stop_all_queues(sdata->dev); ieee80211_roc_purge(local, sdata); @@ -1412,8 +1412,6 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) sdata->vif.type != NL80211_IFTYPE_STATION); } - set_bit(SDATA_STATE_RUNNING, &sdata->state); - switch (sdata->vif.type) { case NL80211_IFTYPE_P2P_DEVICE: rcu_assign_pointer(local->p2p_sdata, sdata); @@ -1472,6 +1470,8 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); } + set_bit(SDATA_STATE_RUNNING, &sdata->state); + return 0; err_del_interface: drv_remove_interface(local, sdata); diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 24c0a1706b92..48deda3570a7 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -2319,6 +2319,10 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, u16 len_rthdr; int hdrlen; + sdata = IEEE80211_DEV_TO_SUB_IF(dev); + if (unlikely(!ieee80211_sdata_running(sdata))) + goto fail; + memset(info, 0, sizeof(*info)); info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | IEEE80211_TX_CTL_INJECTED; @@ -2378,8 +2382,6 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, * This is necessary, for example, for old hostapd versions that * don't use nl80211-based management TX/RX. */ - sdata = IEEE80211_DEV_TO_SUB_IF(dev); - list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { if (!ieee80211_sdata_running(tmp_sdata)) continue; @@ -4169,7 +4171,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb, struct sk_buff *next; int len = skb->len; - if (unlikely(skb->len < ETH_HLEN)) { + if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { kfree_skb(skb); return; } @@ -4566,7 +4568,7 @@ netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb, struct ieee80211_key *key; struct sta_info *sta; - if (unlikely(skb->len < ETH_HLEN)) { + if (unlikely(!ieee80211_sdata_running(sdata) || skb->len < ETH_HLEN)) { kfree_skb(skb); return NETDEV_TX_OK; }