ath11k: fix destination monitor ring out of sync

More than 20000 PPDU id jumping causing status ring and destination
ring processing not sync. The status ring is processed and the
destination ring is not processed. Since destination is not reaped for
so long, backpressure occurs at the destination ring.

To address this issue update the PPDU id with the latest PPDU, this
will allow the destination ring to be reaped and will prevent the
rings from getting out of sync.

Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1.r1-00026-QCAHKSWPL_SILICONZ-2
Signed-off-by: Karthikeyan Kathirvel <quic_kathirve@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220210064706.6171-1-quic_kathirve@quicinc.com

1 files changed, 36 insertions, 6 deletions

diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index 99dc9b5bbf4b..20c9e7904261 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -4959,6 +4959,12 @@ mon_deliver_fail:
 	return -EINVAL;
 }
 
+/* The destination ring processing is stuck if the destination is not
+ * moving while status ring moves 16 PPDU. The destination ring processing
+ * skips this destination ring PPDU as a workaround.
+ */
+#define MON_DEST_RING_STUCK_MAX_CNT 16
+
 static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, int mac_id,
 					  u32 quota, struct napi_struct *napi)
 {
@@ -4972,6 +4978,7 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, int mac_id,
 	u32 ring_id;
 	struct ath11k_pdev_mon_stats *rx_mon_stats;
 	u32	 npackets = 0;
+	u32 mpdu_rx_bufs_used;
 
 	if (ar->ab->hw_params.rxdma1_enable)
 		ring_id = dp->rxdma_mon_dst_ring.ring_id;
@@ -5001,16 +5008,39 @@ static void ath11k_dp_rx_mon_dest_process(struct ath11k *ar, int mac_id,
 		head_msdu = NULL;
 		tail_msdu = NULL;
 
-		rx_bufs_used += ath11k_dp_rx_mon_mpdu_pop(ar, mac_id, ring_entry,
-							  &head_msdu,
-							  &tail_msdu,
-							  &npackets, &ppdu_id);
+		mpdu_rx_bufs_used = ath11k_dp_rx_mon_mpdu_pop(ar, mac_id, ring_entry,
+							      &head_msdu,
+							      &tail_msdu,
+							      &npackets, &ppdu_id);
+
+		rx_bufs_used += mpdu_rx_bufs_used;
+
+		if (mpdu_rx_bufs_used) {
+			dp->mon_dest_ring_stuck_cnt = 0;
+		} else {
+			dp->mon_dest_ring_stuck_cnt++;
+			rx_mon_stats->dest_mon_not_reaped++;
+		}
+
+		if (dp->mon_dest_ring_stuck_cnt > MON_DEST_RING_STUCK_MAX_CNT) {
+			rx_mon_stats->dest_mon_stuck++;
+			ath11k_dbg(ar->ab, ATH11K_DBG_DATA,
+				   "status ring ppdu_id=%d dest ring ppdu_id=%d mon_dest_ring_stuck_cnt=%d dest_mon_not_reaped=%u dest_mon_stuck=%u\n",
+				   pmon->mon_ppdu_info.ppdu_id, ppdu_id,
+				   dp->mon_dest_ring_stuck_cnt,
+				   rx_mon_stats->dest_mon_not_reaped,
+				   rx_mon_stats->dest_mon_stuck);
+			pmon->mon_ppdu_info.ppdu_id = ppdu_id;
+			continue;
+		}
 
 		if (ppdu_id != pmon->mon_ppdu_info.ppdu_id) {
 			pmon->mon_ppdu_status = DP_PPDU_STATUS_START;
 			ath11k_dbg(ar->ab, ATH11K_DBG_DATA,
-				   "dest_rx: new ppdu_id %x != status ppdu_id %x",
-				   ppdu_id, pmon->mon_ppdu_info.ppdu_id);
+				   "dest_rx: new ppdu_id %x != status ppdu_id %x dest_mon_not_reaped = %u dest_mon_stuck = %u\n",
+				   ppdu_id, pmon->mon_ppdu_info.ppdu_id,
+				   rx_mon_stats->dest_mon_not_reaped,
+				   rx_mon_stats->dest_mon_stuck);
 			break;
 		}
 		if (head_msdu && tail_msdu) {