From:   Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
To:     nbd@nbd.name
Cc:     linux-wireless@vger.kernel.org, rosenp@gmail.com,
        sgruszka@redhat.com
Subject: [RFC 0/4] do not use sg if not properly supported by usb controller
Date:   Tue, 15 Jan 2019 13:33:41 +0100
Message-Id: <cover.1547549771.git.lorenzo.bianconi@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

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. Some users have reported sg issues on AMD IOMMU

Lorenzo Bianconi (4):
  mt76: usb: move mt76u_check_sg in usb.c
  mt76: usb: do not use sg buffer for fw upload
  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  |   9 +-
 .../wireless/mediatek/mt76/mt76x2/usb_init.c  |   2 +-
 drivers/net/wireless/mediatek/mt76/usb.c      | 132 +++++++++++++-----
 drivers/net/wireless/mediatek/mt76/usb_mcu.c  |   5 +-
 6 files changed, 107 insertions(+), 57 deletions(-)

-- 
2.20.1