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wifi: ath12k: add TCL ring TX buffer allocation failure counter

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When ath12k_dp_tx_assign_buffer() fails, the TX path returns -ENOMEM
silently with no visibility into which traffic class is affected.
Without a counter, TX descriptor pool exhaustion is invisible during
debugging.

Add txbuf_na[] indexed by pool_id to ath12k_device_dp_tx_err_stats to
track TX descriptor pool allocation failures per traffic class and
increment it on assign failure in the TX path. Expose the per-pool
counts in debugfs under a new 'TX Descriptor Pool Alloc Failures'
section.

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

Signed-off-by: Hariharan Ramanathan <hariharan.ramanathan@oss.qualcomm.com>
Co-developed-by: Pardeep Kaur <pardeep.kaur@oss.qualcomm.com>
Signed-off-by: Pardeep Kaur <pardeep.kaur@oss.qualcomm.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Link: https://patch.msgid.link/20260819053247.1420393-4-pardeep.kaur@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>
This commit is contained in:
Hariharan Ramanathan 2026-08-19 11:02:42 +05:30 • committed by Jeff Johnson
commit 6fec999446
3 changed files with 10 additions and 1 deletions
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