Hi Roy, On Mon, 2014-07-28 at 15:05 +0800, Roy wrote: > Hi Dinh: > > Do you think it might be a problem of a un-aligned DMA buffer > address? We know that the usbnet driver submits lots of URBs with a > 2-byte aligned buffer address. But in Buffer DMA mode, the starting DMA > address must be DWORD-aligned, only if turn on Descriptor DMA mode this > this 4-byte aligned limit disappear. We met this kind of problem in our > platform which powered by a arm based SoC, RK3288, using the DWC_OTG > 3.10a usb IP. > > Yes, I think this is the issue. But even in decscriptor DMA mode the USB/ethernet is only able to get an IP address from DHCP, pings sometime work and when pings work, it is extremely slow. I still cannot mount an NFS using a the adapter. Does it work perfectly for you? Would you care to share a patch? Thanks, Dinh > 发自我的 iPad > > > on 7-15-2014，10:39，Dinh Nguyen <dinh.linux@xxxxxxxxx> wrote： > > > > Hi Paul, > > > > On 6/25/14, 1:24 PM, Paul Zimmerman wrote: > >>> From: Dinh Nguyen [mailto:dinh.linux@xxxxxxxxx] > >>> Sent: Wednesday, June 25, 2014 8:52 AM > >>> > >>> I was wondering if you have ever tested this driver with a USB/ethernet > >>> dongle? I'm using the apple usb/ethernet dongle, which is basically just > >>> the ASIX AX88xxx Based Ethernet Adapter. From brief debugging, it > >>> appears that Bulk and Interrupt endpoint data are getting corrupted > >>> during the data transfer. > >>> > >>> Will continue to debug, but was just curious if you have tested this > >>> kind of device? > >> Hi Dinh, > >> > >> Yes, I have tested the driver with a couple of different Ethernet > >> dongles. That was a while ago though, so I don't know if anything has > >> changed lately to break that. I don't remember what brand of Ethernet > >> dongle I used, unfortunately. > > I managed to debug this a bit further. The ethernet dongles all work > > fine on my > > raspberry pi. But on the SOCFPGA platform, which has version 2.93a of > > the USB > > IP, the ethernet dongle seems to only work if I turn on Descriptor DMA and > > uframe_sched=0. > > > > Dinh > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
