[PATCH ath-next v3 0/8] wifi: ath12k: extend device DP stats for TX and RX observability

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

From: Pardeep Kaur <pardeep.kaur@oss.qualcomm.com>

Extend ath12k device DP stats for TX and RX path observability.

Patch 1 fixes out-of-bounds array access on TX stats arrays
fw_tx_status[], tx_wbm_rel_source[] and tqm_rel_reason[] by adding
likely() bounds checks before each increment. The default: case of the
switch statement that follows already handles unknown values with
ath12k_warn(), so no WARN_ON_ONCE is added for fw_tx_status to avoid
double-warning on an out-of-range htt_status value.

Patch 2 renames the local variable wbm_status to htt_status in
ath12k_dp_tx_process_htt_tx_complete() to accurately reflect the field
origin, and simplifies ts.acked to use true directly.

Patch 3 adds a per-pool TX descriptor allocation failure counter
txbuf_na[] indexed by pool_id to track which traffic class ran out of
TX descriptors, and exposes it in device_dp_stats debugfs.

Patch 4 adds a write handler to device_dp_stats debugfs so that writing
'reset' clears all device DP stats counters without reloading the driver.
Uses simple_write_to_buffer() to correctly handle partial writes and
non-zero ppos, consistent with ath12k_write_simulate_fw_crash().

Patch 5 introduces a new dp_stats.h header with the
ath12k_wbm_err_drop_reason enum, adds per-drop-reason counters in the
WBM RX error path, and exposes them in device_dp_stats debugfs.

Patch 6 adds a 2D sent_to_stack[ring_id][device_id] counter to track
successful MSDU deliveries to the network stack, attributed to the ring
owner's dp so it is directly comparable with reo_rx[] in the same
debugfs file in MLO configurations.

Patch 7 fixes the REO Rx Received debugfs output to use 0-based ring
indexing and lowercase "ring%d:" consistent with other ring counters.

Patch 8 adds a dedicated sw_desc_fallback counter to track how often the
WBM RX error path falls back to SW descriptor retrieval when HW CC is
not done, distinct from actual packet drops.

v3 changes:
- Remove WARN_ON_ONCE for fw_tx_status out-of-range: the default: branch
  of the switch already calls ath12k_warn() for unknown htt_status values
  so adding WARN_ON_ONCE would double-warn (patch 1).
- Replace copy_from_user() with simple_write_to_buffer() in the stats
  reset handler to correctly handle split writes and non-zero ppos (patch 4).
- Drop Fixes: tag from patch 7; cosmetic debugfs fix not needing backport.

v2 changes:
- Fix txbuf_na[] indexing: use pool_id instead of ring_id so the counter
  tracks TX descriptor pool exhaustion per traffic class (patch 3).
- Fix sent_to_stack[] to use a 2D array [ring_id][device_id] attributed
  to the ring owner's dp, making it directly comparable with reo_rx[] in
  the same debugfs file in MLO configurations (patch 6).
- Fix double-counting of WBM_ERR_DROP_RXDMA_GENERIC: move the increment
  inside rxdma_err()'s default: branch (patch 5).
- Remove WBM_ERR_INV_PEER_ID, WBM_ERR_DROP_INV_COOKIE and
  WBM_ERR_DROP_INV_PUSH_RSN from the drop reason enum; no increment
  sites in the datapath (patch 5).
- Remove leading space from "WBM Rx Drop Count" section header (patch 5).
- Add likely()/WARN_ON_ONCE() bounds check on ring_id for sent_to_stack[]
  (patch 6).
- Update commit messages for patches 3 and 6 to reflect corrected
  semantics.

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

Signed-off-by: Pardeep Kaur <pardeep.kaur@oss.qualcomm.com>
---

Aniruddha Mishra (2):
  wifi: ath12k: add WBM RX error drop statistics
  wifi: ath12k: add WBM SW desc fallback counter

Hariharan Ramanathan (4):
  wifi: ath12k: rename wbm_status to htt_status in HTT TX completion
  wifi: ath12k: add TCL ring TX buffer allocation failure counter
  wifi: ath12k: add device DP stats reset support via debugfs
  wifi: ath12k: track per-ring RX sent-to-stack count

Pardeep Kaur (2):
  wifi: ath12k: fix out-of-bounds access on TX stats arrays
  wifi: ath12k: fix 1-based ring index in REO Rx Received debugfs output

 drivers/net/wireless/ath/ath12k/debugfs.c     | 80 ++++++++++++++++++-
 drivers/net/wireless/ath/ath12k/dp.h          | 14 +++-
 drivers/net/wireless/ath/ath12k/dp_stats.h    | 25 ++++++
 drivers/net/wireless/ath/ath12k/wifi7/dp_rx.c | 52 +++++++++---
 drivers/net/wireless/ath/ath12k/wifi7/dp_tx.c | 27 ++++---
 .../net/wireless/ath/ath12k/wifi7/hal_rx.c    |  5 +-
 6 files changed, 177 insertions(+), 26 deletions(-)
 create mode 100644 drivers/net/wireless/ath/ath12k/dp_stats.h

base-commit: 691e5e43b2aa5da35b044532845a3b230e540894
--
2.34.1