6.6-stable review patch. If anyone has any objections, please let me know.
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From: Shayne Chen shayne.chen@mediatek.com
[ Upstream commit 42cb27af34de4acf680606fad2c1f2932110591f ]
Some management frames are first processed by the firmware and then passed to the driver through the MCU event rings. In CONNAC3, event rings do not support scatter-gather and have a size limitation of 2048 bytes. If a packet sized between 1728 and 2048 bytes arrives from an event ring, the ring will hang because the driver attempts to use scatter-gather to process it.
To fix this, include the size of struct skb_shared_info in the MCU RX buffer size to prevent scatter-gather from being used for event skb in mt76_dma_rx_fill_buf().
Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices") Co-developed-by: Peter Chiu chui-hao.chiu@mediatek.com Signed-off-by: Peter Chiu chui-hao.chiu@mediatek.com Signed-off-by: Shayne Chen shayne.chen@mediatek.com Link: https://patch.msgid.link/20250515032952.1653494-7-shayne.chen@mediatek.com Signed-off-by: Felix Fietkau nbd@nbd.name Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/mediatek/mt76/mt7996/dma.c | 4 ++-- drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h | 3 +++ 2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/dma.c b/drivers/net/wireless/mediatek/mt76/mt7996/dma.c index 586e247a1e064..04c9fd0e6b002 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7996/dma.c +++ b/drivers/net/wireless/mediatek/mt76/mt7996/dma.c @@ -300,7 +300,7 @@ int mt7996_dma_init(struct mt7996_dev *dev) ret = mt76_queue_alloc(dev, &dev->mt76.q_rx[MT_RXQ_MCU], MT_RXQ_ID(MT_RXQ_MCU), MT7996_RX_MCU_RING_SIZE, - MT_RX_BUF_SIZE, + MT7996_RX_MCU_BUF_SIZE, MT_RXQ_RING_BASE(MT_RXQ_MCU)); if (ret) return ret; @@ -309,7 +309,7 @@ int mt7996_dma_init(struct mt7996_dev *dev) ret = mt76_queue_alloc(dev, &dev->mt76.q_rx[MT_RXQ_MCU_WA], MT_RXQ_ID(MT_RXQ_MCU_WA), MT7996_RX_MCU_RING_SIZE_WA, - MT_RX_BUF_SIZE, + MT7996_RX_MCU_BUF_SIZE, MT_RXQ_RING_BASE(MT_RXQ_MCU_WA)); if (ret) return ret; diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h b/drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h index 25bb365612314..7d2074e2b635e 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h +++ b/drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h @@ -27,6 +27,9 @@ #define MT7996_RX_RING_SIZE 1536 #define MT7996_RX_MCU_RING_SIZE 512 #define MT7996_RX_MCU_RING_SIZE_WA 1024 +/* scatter-gather of mcu event is not supported in connac3 */ +#define MT7996_RX_MCU_BUF_SIZE (2048 + \ + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
#define MT7996_FIRMWARE_WA "mediatek/mt7996/mt7996_wa.bin" #define MT7996_FIRMWARE_WM "mediatek/mt7996/mt7996_wm.bin"