[PATCH v5 0/4] ath11k/ath12k: implement TX flow control

[Jose Ignacio Tornos Martinez]

This series implements custom wake_tx_queue operations for ath11k and
ath12k drivers to prevent hardware ring overflow issues under heavy
traffic.

Without proper flow control, both drivers experience -ENOMEM errors
("failed to transmit frame -12") when the hardware TCL ring fills up.
Additionally, ath12k can hang under sustained high throughput. These
issues are more commonly observed in VMs with PCIe passthrough but
also occur on bare metal systems.

The implementation follows the pattern used in the iwlwifi driver,
adapted for ath11k/ath12k hardware ring architecture, checking
hardware ring space before dequeuing packets from mac80211.

Testing shows stable operation with eliminated -ENOMEM errors, no hangs,
and improved throughput under heavy traffic conditions.

Note: I will have limited availability from mid-August to
mid-September. I will address any review feedback before then
or promptly after returning.

Jose Ignacio Tornos Martinez (4):
  wifi: ath11k: use queue mapping for WCN6750 ring selection
  wifi: ath11k/ath12k: remove skb parameter from get_ring_selector
  wifi: ath11k: implement custom wake_tx_queue with flow control
  wifi: ath12k: implement custom wake_tx_queue with flow control

v5: No modification in patches 1,2 and 3
    Remove an unused variable in patch 4
v4: https://lore.kernel.org/all/20260724053121.15759-1-jtornosm@xxxxxxxxxx/
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2.49.0