[PATCH ath-next v3 8/8] wifi: ath12k: add WBM SW desc fallback counter

[Pardeep Kaur <pardeep.kaur@oss.qualcomm.com>]

From: Aniruddha Mishra <aniruddha.mishra@oss.qualcomm.com>

When HW CC is not done, the WBM RX error path falls back to
cookie-based descriptor retrieval via ath12k_dp_get_rx_desc(). This
fallback path is taken before knowing whether the retrieval will
succeed, so it is not a drop event and should not be counted in the
drop[] array.

Add a dedicated sw_desc_fallback counter in
ath12k_device_dp_rx_wbm_err_stats to track how often the HW CC
fallback path is taken, distinct from actual packet drops. Expose
the counter in the device_dp_stats debugfs file as a separate line.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.6.r1-00402-QCAHKSWPL_SILICONZ-1

Signed-off-by: Aniruddha Mishra <aniruddha.mishra@oss.qualcomm.com>
Co-developed-by: Pardeep Kaur <pardeep.kaur@oss.qualcomm.com>
Signed-off-by: Pardeep Kaur <pardeep.kaur@oss.qualcomm.com>
---
 drivers/net/wireless/ath/ath12k/debugfs.c     | 4 ++++
 drivers/net/wireless/ath/ath12k/dp.h          | 1 +
 drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c | 1 +
 3 files changed, 6 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/debugfs.c b/drivers/net/wireless/ath/ath12k/debugfs.c
index fe513b3489bc..d2d89a7e340d 100644
--- a/drivers/net/wireless/ath/ath12k/debugfs.c
+++ b/drivers/net/wireless/ath/ath12k/debugfs.c
@@ -1122,6 +1122,10 @@ static ssize_t ath12k_debugfs_dump_device_dp_stats(struct file *file,
 		len += scnprintf(buf + len, size - len, "%s: %u\n",
 				 wbm_rx_drop[i], device_stats->wbm_err.drop[i]);
 
+	len += scnprintf(buf + len, size - len,
+			 "\nWBM SW desc fallback (HW CC not done): %u\n",
+			 device_stats->wbm_err.sw_desc_fallback);
+
 	len += scnprintf(buf + len, size - len, "\nREO sent to stack\n");
 	for (i = 0; i < DP_REO_DST_RING_MAX; i++) {
 		len += scnprintf(buf + len, size - len, "ring%d:", i);
diff --git a/drivers/net/wireless/ath/ath12k/dp.h b/drivers/net/wireless/ath/ath12k/dp.h
index 5cfe2096c633..289aede6dabb 100644
--- a/drivers/net/wireless/ath/ath12k/dp.h
+++ b/drivers/net/wireless/ath/ath12k/dp.h
@@ -442,6 +442,7 @@ struct ath12k_device_dp_rx_wbm_err_stats {
 	u32 rxdma_error[HAL_REO_ENTR_RING_RXDMA_ECODE_MAX];
 	u32 reo_error[HAL_REO_DEST_RING_ERROR_CODE_MAX];
 	u32 drop[WBM_ERR_DROP_MAX];
+	u32 sw_desc_fallback;
 };
 
 struct ath12k_device_dp_stats {
diff --git a/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c b/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c
index 60489cfd4e54..d96d8301565c 100644
--- a/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c
+++ b/drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c
@@ -1968,6 +1968,7 @@ int ath12k_wifi7_dp_rx_process_wbm_err(struct ath12k_dp *dp,
 
 		/* retry manual desc retrieval if hw cc is not done */
 		if (!desc_info) {
+			dp->device_stats.wbm_err.sw_desc_fallback++;
 			desc_info = ath12k_dp_get_rx_desc(dp, err_info.cookie);
 			if (!desc_info) {
 				dp->device_stats.wbm_err.drop[WBM_ERR_GET_SW_DESC]++;
-- 
2.34.1