[PATCH v8 0/2] wifi: ath12k: implement TX flow control

[Jose Ignacio Tornos Martinez]

This series implements a custom wake_tx_queue operation for the ath12k
driver to prevent hardware ring overflow issues under heavy traffic.

Without proper flow control, the driver can hang and experiences -ENOMEM
errors ("failed to transmit frame -12") when the hardware TCL ring fills
up. 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 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.

Jose Ignacio Tornos Martinez (2):
  wifi: ath12k: remove skb parameter from get_ring_selector
  wifi: ath12k: implement custom wake_tx_queue with flow control

v8: Split ath11k and ath12k into separate series to avoid conflict
    with Julius's airtime queue limits series (ath11k only) and help to
    unblock both
    No code changes from v7
v7: https://lore.kernel.org/all/20260917064825.12747-1-jtornosm@redhat.com/
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2.54.0