Re: New USB stack on FreeBSD w/Linux emulation layer coming

On Thursday 17 May 2007, Hans Petter Selasky wrote:
> 
> I would like introduce a new USB API call, so that my pre-allocate model will 
> work better with your USB API. For example I want something like this:
> 
> void
> usb_setup_endpoint(struct usb_device *usb, struct usb_interface *ui, struct 
> usb_host_endpoint *uhe, uint32_t bufsize, uint32_t unused0, uint32_t unused1, 
> uint32_t unused2);

The usb_device and usb_interface are implied by the usb_host_endpoint,
and "unused" parameters are pointless.  Sizes are "size_t", and such
a call could obviously fail because of invalid parameters.   So

	int usb_setup_endpoint(struct usb_host_endpoint *hep, size_t bufsize);

What would such a call do, though?  Who would use it, and why?


> On FreeBSD this function will pre-allocate one or two USB transfers for an 
> endpoint using the given "bufsize" argument. Those FreeBSD USB transfers will 
> then be used to do all the Linux USB transfers. This function can block and 
> must have a context.

So what's the model ... GPL'd Linux drivers will be modified to
incorporate that call, so they'd work better on FreeBSD?

- Dave

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