diff mbox series

[v4] ath11k: fix destination monitor ring out of sync

Message ID 20220210064706.6171-1-quic_kathirve@quicinc.com
State New
Headers show
Series [v4] ath11k: fix destination monitor ring out of sync | expand

Commit Message

Karthikeyan Kathirvel Feb. 10, 2022, 6:47 a.m. UTC
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>
---
v4:
	Rebased and added base details
v3:
	Added Tested-on tag
v2:
	Corrected the signed off details

 drivers/net/wireless/ath/ath11k/dp.h    |  3 ++
 drivers/net/wireless/ath/ath11k/dp_rx.c | 42 +++++++++++++++++++++----
 2 files changed, 39 insertions(+), 6 deletions(-)


base-commit: 9d2612e898b29539a5f395aa03487a826fe70ecf

Comments

Kalle Valo Feb. 14, 2022, 5:47 p.m. UTC | #1
Karthikeyan Kathirvel <quic_kathirve@quicinc.com> wrote:

> 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>

Patch applied to ath-next branch of ath.git, thanks.

1e15aacd1238 ath11k: fix destination monitor ring out of sync
diff mbox series

Patch

diff --git a/drivers/net/wireless/ath/ath11k/dp.h b/drivers/net/wireless/ath/ath11k/dp.h
index 409d6cc5a1d5..b6ec2d6a2bb6 100644
--- a/drivers/net/wireless/ath/ath11k/dp.h
+++ b/drivers/net/wireless/ath/ath11k/dp.h
@@ -115,6 +115,8 @@  struct ath11k_pdev_mon_stats {
 	u32 dest_mpdu_drop;
 	u32 dup_mon_linkdesc_cnt;
 	u32 dup_mon_buf_cnt;
+	u32 dest_mon_stuck;
+	u32 dest_mon_not_reaped;
 };
 
 struct dp_full_mon_mpdu {
@@ -167,6 +169,7 @@  struct ath11k_mon_data {
 
 struct ath11k_pdev_dp {
 	u32 mac_id;
+	u32 mon_dest_ring_stuck_cnt;
 	atomic_t num_tx_pending;
 	wait_queue_head_t tx_empty_waitq;
 	struct dp_rxdma_ring rx_refill_buf_ring;
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 @@  static int ath11k_dp_rx_mon_deliver(struct ath11k *ar, u32 mac_id,
 	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) {