|author||Sarah Sharp <email@example.com>||2014-01-31 11:26:25 -0800|
|committer||Sarah Sharp <firstname.lastname@example.org>||2014-02-07 14:30:02 -0800|
xhci 1.0: Limit arbitrarily-aligned scatter gather.
xHCI 1.0 hosts have a set of requirements on how to align transfer buffers on the endpoint rings called "TD fragment" rules. When the ax88179_178a driver added support for scatter gather in 3.12, with commit 804fad45411b48233b48003e33a78f290d227c8 "USBNET: ax88179_178a: enable tso if usb host supports sg dma", it broke the device under xHCI 1.0 hosts. Under certain network loads, the device would see an unexpected short packet from the host, which would cause the device to stop sending ethernet packets, even through USB packets would still be sent. Commit 35773dac5f86 "usb: xhci: Link TRB must not occur within a USB payload burst" attempted to fix this. It was a quick hack to partially implement the TD fragment rules. However, it caused regressions in the usb-storage layer and userspace USB drivers using libusb. The patches to attempt to fix this are too far reaching into the USB core, and we really need to implement the TD fragment rules correctly in the xHCI driver, instead of continuing to wallpaper over the issues. Disable arbitrarily-aligned scatter-gather in the xHCI driver for 1.0 hosts. Only the ax88179_178a driver checks the no_sg_constraint flag, so don't set it for 1.0 hosts. This should not impact usb-storage or usbfs behavior, since they pass down max packet sized aligned sg-list entries (512 for USB 2.0 and 1024 for USB 3.0). Signed-off-by: Sarah Sharp <email@example.com> Tested-by: Mark Lord <firstname.lastname@example.org> Cc: David Laight <David.Laight@ACULAB.COM> Cc: Bjørn Mork <email@example.com> Cc: Freddy Xin <firstname.lastname@example.org> Cc: Ming Lei <email@example.com> Cc: firstname.lastname@example.org # 3.12
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
0 files changed, 0 insertions, 0 deletions