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From:   Johan Almbladh <johan.almbladh@anyfinetworks.com>
To:     johannes@sipsolutions.net
Cc:     Mathy.Vanhoef@kuleuven.be, fredrik.olofsson@anyfinetworks.com,
        linux-wireless@vger.kernel.org,
        Johan Almbladh <johan.almbladh@anyfinetworks.com>
Subject: [PATCH] mac80211: Set priority and queue mapping for injected frames
Date:   Thu,  1 Apr 2021 18:44:55 +0200
Message-Id: <20210401164455.978245-1-johan.almbladh@anyfinetworks.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Some drivers, for example mt76, use the skb priority field, and
expects that to be consistent with the skb queue mapping. On some
frame injection code paths that was not true, and it broke frame
injection. Now the skb queue mapping is set according to the skb
priority value when the frame is injected. The skb priority value
is also derived from the frame data for all frame types, as it
was done prior to dbd50a851c50bb95e457 (only allocate one queue
when using iTXQs). Fixes frame injection with the mt76 driver on
MT7610E chipset.

Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
---
 net/mac80211/tx.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 5d06de61047a..3b0ac4952cdf 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2267,17 +2267,6 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
 						    payload[7]);
 	}
 
-	/* Initialize skb->priority for QoS frames. If the DONT_REORDER flag
-	 * is set, stick to the default value for skb->priority to assure
-	 * frames injected with this flag are not reordered relative to each
-	 * other.
-	 */
-	if (ieee80211_is_data_qos(hdr->frame_control) &&
-	    !(info->control.flags & IEEE80211_TX_CTRL_DONT_REORDER)) {
-		u8 *p = ieee80211_get_qos_ctl(hdr);
-		skb->priority = *p & IEEE80211_QOS_CTL_TAG1D_MASK;
-	}
-
 	rcu_read_lock();
 
 	/*
@@ -2341,6 +2330,15 @@ netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
 
 	info->band = chandef->chan->band;
 
+	/* Initialize skb->priority according to frame type and TID class,
+	 * with respect to the sub interface that the frame will actually
+	 * be transmitted on. If the DONT_REORDER flag is set, the original
+	 * skb-priority is preserved to assure frames injected with this
+	 * flag are not reordered relative to each other.
+	 */
+	ieee80211_select_queue_80211(sdata, skb, hdr);
+	skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority));
+
 	/* remove the injection radiotap header */
 	skb_pull(skb, len_rthdr);
 
-- 
2.25.1