mac80211: send ADDBA requests using the tid/queue of the aggregation session

commit 1fe98f5690c4219d419ea9cc190f94b3401cf324 upstream.

Sending them out on a different queue can cause a race condition where a
number of packets in the queue may be discarded by the receiver, because
the ADDBA request is sent too early.
This affects any driver with software A-MPDU setup which does not allocate
packet seqno in hardware on tx, regardless of whether iTXQ is used or not.
The only driver I've seen that explicitly deals with this issue internally
is mwl8k.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20211202124533.80388-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 54821fb1a960da626be57a94fd726d8803332c58..79138225e880809140c1510d66e3d0a4f59a97f7 100644 (file)
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -109,7 +109,7 @@ static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
        mgmt->u.action.u.addba_req.start_seq_num =
                                        cpu_to_le16(start_seq_num << 4);
 
-       ieee80211_tx_skb(sdata, skb);
+       ieee80211_tx_skb_tid(sdata, skb, tid);
 }
 
 void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)