theses days i try to migrate the usbredir lib to Windows
the usbredir-0.6/usbredirserver/usbredirserver.c connect to qemu's redirect channel and spicec connect to the guest
the usbredirserver works smooth in Linux, spicec show the usb disk works well.
when i compile usbredir on Windows, usbredirserver connect and open usb device ok,
but qemu's guest(windows xp) in spicec can detect the usb device, but only show unkown usb device,
i open the device in hardware manager, and found pid and vid is all 000.
i debug the qemu's redirect code(hw/usb/hcd_ehci.c), and found the diff between linux's and windows's usbredirserver
is here:
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static int ehci_execute(EHCIPacket *p, const char *action)
...............
p->pid = ehci_get_pid(&p->qtd);
p->queue->last_pid = p->pid;
endp = get_field(p->queue->qh.epchar, QH_EPCHAR_EP); ///On windows it always return 0
///while Linux it will return 0, 1 or 2
ep = usb_ep_get(p->queue->dev, p->pid, endp);
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i found the qh.epchar read from dma, but can not find who write it,
can you explain it the flow of the function.
how doest usbredirect control the dma ?
thanks you tow very much.