From: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
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
