From: Joshua Klinesmith <joshuaklinesmith@gmail.com>
To: linux-wireless@vger.kernel.org
Cc: nbd@nbd.name, lorenzo@kernel.org, ryder.lee@mediatek.com,
shayne.chen@mediatek.com, sean.wang@mediatek.com,
linux-kernel@vger.kernel.org,
Joshua Klinesmith <joshuaklinesmith@gmail.com>
Subject: [PATCH wireless v2 0/2] wifi: mt76: clear cipher state on key removal for WED offload
Date: Mon, 6 Apr 2026 20:15:29 -0400 [thread overview]
Message-ID: <20260407001531.31207-1-joshuaklinesmith@gmail.com> (raw)
When switching WiFi encryption from WPA-PSK/SAE to open/none with
WED hardware offload enabled, throughput drops to zero. The BSS
cipher state is set when group keys are installed but never cleared
when they are removed. The WA firmware retains the stale cipher
value and keeps the protection bit set on WED-offloaded packets,
causing all plaintext frames to be dropped.
Found via reverse engineering of the vendor MediaTek SDK
mt_wifi.ko driver.
---
v1 -> v2: Rebased on wireless.git (was mt76-fixes)
Joshua Klinesmith (2):
wifi: mt76: mt7915: clear cipher state on key removal for WED offload
wifi: mt76: mt7996: clear cipher state on key removal for WED offload
drivers/net/wireless/mediatek/mt76/mt7915/main.c | 6 ++++++
drivers/net/wireless/mediatek/mt76/mt7996/main.c | 7 +++++++
2 files changed, 13 insertions(+)
base-commit: 45dbf8fcea4dcf28cabcf4a1778e908feadf4c90
--
2.43.0
next reply other threads:[~2026-04-07 0:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-07 0:15 Joshua Klinesmith [this message]
2026-04-07 0:15 ` [PATCH wireless v2 1/2] wifi: mt76: mt7915: clear cipher state on key removal for WED offload Joshua Klinesmith
2026-04-07 0:15 ` [PATCH wireless v2 2/2] wifi: mt76: mt7996: " Joshua Klinesmith
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