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Hardware/platform: QCN9274 hw2.0, PCIe, on an NXP ls1046 (ARM64, little-endian). Firmware: WLAN.WBE.1.6-01243 (QC_IMAGE_VERSION_STRING=WLAN.WBE.1.6-01243- QCAHKSWPL_SILICONZ-1, fw_version 0x160484db), from linux-firmware ath12k/QCN9274/hw2.0. Driver: ath12k, current mainline / backports. Symptom ------- With WPA2-PSK or WPA3-SAE in AP mode, stations authenticate and associate, but the 4-way handshake never completes: hostapd (-dd) reports "did not Ack EAPOL-Key frame", the EAPOL-Key timeout retries exhaust, and the client is deauthenticated with reason 15 (4-way handshake timeout). Open/unencrypted APs work fine. Analysis -------- WLAN.WBE.1.6 advertises WMI_TLV_SERVICE_ETH_OFFLOAD, so ath12k enables SUPPORTS_TX_ENCAP_OFFLOAD / SUPPORTS_RX_DECAP_OFFLOAD (commit d29591d5b52e) and mac80211 switches the AP vdev to 802.3/Ethernet encapsulation. The unencrypted EAPOL msg 1/4, sent to a still-unauthorized peer, then goes through the RAW / TO_FW is_diff_encap exception path in ath12k_dp_tx(). Under 1.6 that frame is apparently never put on air - it is never acked. The older WLAN.WBE.1.1.1 firmware does not advertise WMI_TLV_SERVICE_ETH_OFFLOAD, uses the native-WiFi EAPOL path, and completes the handshake. So the trigger is the firmware enabling ETH offload while mishandling the encap-exception EAPOL path. Workaround (local, not proposed for upstream) ---------------------------------------------- Not advertising HW encap/decap offload restores the native-WiFi EAPOL TX path and makes WPA2/WPA3 work again; MLO / Wi-Fi 7 is unaffected (gated separately on the firmware MLO feature IE). This obviously sacrifices offload for everyone, so it isn't a real fix - hence this report. Questions --------- 1. Is this a known issue with WLAN.WBE.1.6 on QCN9274? Is a firmware fix planned? 2. Should the driver special-case the pre-authorization EAPOL frame so it always uses the native-WiFi path even when ETH TX-encap offload is active? Happy to provide full hostapd -dd logs, tx-path traces, or test firmware fixes. Thanks, Michael Pfeifroth