From: Lorenzo Bianconi <[email protected]> Use linear fragment and not a single usb scatter-gather buffer in mt76u {tx,rx} datapath if the usb controller has sg data length constraints. Moreover add disable_usb_sg module parameter in order to explicitly disable scatter-gather. SG I/O is not supported by all host drivers and some users have reported sg issues on AMD IOMMU. This series has been tested on AMD IOMMU cpus/motherboards and on rpi3+
Changes since RFC: - rebased on top of 'fix multiple issues in mt76u error path' https://patchwork.kernel.org/cover/10804919/ I am resending the series since the first attempt seems to be rejected by the ML Lorenzo Bianconi (4): mt76: usb: move mt76u_check_sg in usb.c mt76: usb: do not use sg buffers for mcu messages mt76: usb: use a linear buffer for tx/rx datapath if sg is not supported mt76: usb: introduce disable_usb_sg parameter drivers/net/wireless/mediatek/mt76/mt76.h | 14 +- .../net/wireless/mediatek/mt76/mt76x0/usb.c | 2 +- .../wireless/mediatek/mt76/mt76x02_usb_mcu.c | 3 +- .../wireless/mediatek/mt76/mt76x2/usb_init.c | 2 +- drivers/net/wireless/mediatek/mt76/usb.c | 133 +++++++++++++----- drivers/net/wireless/mediatek/mt76/usb_mcu.c | 5 +- 6 files changed, 105 insertions(+), 54 deletions(-) -- 2.20.1
