Re: DLT_ request

[Scott Deandrea <sdeandrea () apple com>]

Correct, but it will be set to kIOReturnInvalid (0xe0000001).

--scott

> On Jan 7, 2017, at 6:51 PM, Guy Harris <guy () alum mit edu> wrote:
>
> > On Dec 12, 2016, at 6:11 PM, Scott Deandrea <sdeandrea () apple com> wrote:
> >
> > I decided to implement isochronous transfers today and changed the structure slightly:
> > struct
> > {
> >   // Control information
> >   uint32_t frameHeaderLength;  // 28
> >
> >   // Frame information
> >   uint32_t frameLength;   // Amount of data sent/received this frame
> >   uint32_t frameStatus;    // IOReturn result of the I/O this frame 
> >   uint64_t frameNumber; // Frame number on which this was scheduled/executed by the controller
> >   uint64_t ioTimestamp;  // Time in which the frame completed
> > } __attribute__((packed, aligned (sizeof(uint32_t))));   
> >
> > Therefore, the isochronous format for a request with type kAppleUSBHostPacketFilterRequestComplete is as follows:
> > Link Header
> > padding, if required to force 4-byte alignment
> > Isochronous Frame[0] Header (frameHeaderLength bytes in length)
> > Isochronous Frame[0] Data (frameLength bytes)
> > …
> > padding, if required to force 4-byte alignment
> > Isochronous Frame[linkHeader.ioFrameCount - 1] Header (aligned to 4 bytes, frameHeaderLength bytes in length)
> > Isochronous Frame[linkHeader.ioFrameCount - 1] Data (frameLength bytes)
> >
> > The isochronous format for a request with type kAppleUSBHostPacketFilterRequestSubmit is similar (no data following 
> > the isochronous frame header):
> > Link Header
> > padding, if required to force 4-byte alignment
> > Isochronous Frame[0] Header (frameHeaderLength bytes in length)
> > …
> > padding, if required to force 4-byte alignment
> > Isochronous Frame[linkHeader.ioFrameCount - 1] Header (aligned to 4 bytes, frameHeaderLength bytes in length)
>
> So, for a "submit" request, the frameStatus fields are presumably not meaningful, as they reports the status of the 
> completed transfer, right?
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