wifi: ath12k: Don't drop tx_status in failure case

When a station idles for a long time, hostapd will try to send
a QoS Null frame to the station as "poll". NL80211_CMD_PROBE_CLIENT
is used for this purpose.
And the skb will be added to ack_status_frame - waiting for a
completion via ieee80211_report_ack_skb().

But when the peer was already removed before the tx_complete arrives,
the peer will be missing. And when using dev_kfree_skb_any (instead
of going through mac80211), the entry will stay inside
ack_status_frames thus not clean up related information in its
internal data structures. This IDR will therefore run full after
8K request were generated for such clients.
At this point, the access point will then just stall and not allow
any new clients because idr_alloc() for ack_status_frame will fail.

ieee80211_free_txskb() on the other hand will (when required) call
ieee80211_report_ack_skb() and make sure that (when required) remove
the entry from the ack_status_frame and clean up related
information in its internal data structures.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Sarika Sharma <quic_sarishar@quicinc.com>
Signed-off-by: Karthikeyan Kathirvel <quic_kathirve@quicinc.com>
Link: https://lore.kernel.org/r/20230802-ath11k-ack_status_leak-v2-1-c0af729d6229@narfation.org
Acked-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://msgid.link/20240430074313.885807-2-quic_kathirve@quicinc.com

diff --git a/drivers/net/wireless/ath/ath12k/dp_tx.c b/drivers/net/wireless/ath/ath12k/dp_tx.c
index 9b6d7d72f57c4a452a48c3e431dfa630f3456210..81a85d5946f5a77bb4648364a1ad5b7ee24f9777 100644 (file)
--- a/drivers/net/wireless/ath/ath12k/dp_tx.c
+++ b/drivers/net/wireless/ath/ath12k/dp_tx.c
@@ -352,15 +352,15 @@ static void ath12k_dp_tx_free_txbuf(struct ath12k_base *ab,
        u8 pdev_id = ath12k_hw_mac_id_to_pdev_id(ab->hw_params, mac_id);
 
        skb_cb = ATH12K_SKB_CB(msdu);
+       ar = ab->pdevs[pdev_id].ar;
 
        dma_unmap_single(ab->dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
        if (skb_cb->paddr_ext_desc)
                dma_unmap_single(ab->dev, skb_cb->paddr_ext_desc,
                                 sizeof(struct hal_tx_msdu_ext_desc), DMA_TO_DEVICE);
 
-       dev_kfree_skb_any(msdu);
+       ieee80211_free_txskb(ar->ah->hw, msdu);
 
-       ar = ab->pdevs[pdev_id].ar;
        if (atomic_dec_and_test(&ar->dp.num_tx_pending))
                wake_up(&ar->dp.tx_empty_waitq);
 }
@@ -448,6 +448,7 @@ static void ath12k_dp_tx_complete_msdu(struct ath12k *ar,
                                       struct hal_tx_status *ts)
 {
        struct ath12k_base *ab = ar->ab;
+       struct ath12k_hw *ah = ar->ah;
        struct ieee80211_tx_info *info;
        struct ath12k_skb_cb *skb_cb;
 
@@ -466,12 +467,12 @@ static void ath12k_dp_tx_complete_msdu(struct ath12k *ar,
        rcu_read_lock();
 
        if (!rcu_dereference(ab->pdevs_active[ar->pdev_idx])) {
-               dev_kfree_skb_any(msdu);
+               ieee80211_free_txskb(ah->hw, msdu);
                goto exit;
        }
 
        if (!skb_cb->vif) {
-               dev_kfree_skb_any(msdu);
+               ieee80211_free_txskb(ah->hw, msdu);
                goto exit;
        }