tcpdump mailing list archives
Re: DLT_ request
From: Scott Deandrea <sdeandrea () apple com>
Date: Sat, 07 Jan 2017 19:35:18 -0800
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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Current thread:
- Re: DLT_ request, (continued)
- Re: DLT_ request Scott Deandrea (Jan 05)
- Re: DLT_ request Guy Harris (Jan 05)
- Re: DLT_ request Scott Deandrea (Jan 05)
- Re: DLT_ request Scott Deandrea (Jan 05)
- Re: DLT_ request Guy Harris (Jan 05)
- Re: DLT_ request Scott Deandrea (Jan 05)
- Re: DLT_ request Guy Harris (Jan 06)
- Re: DLT_ request Scott Deandrea (Jan 06)
- Re: DLT_ request Scott Deandrea (Jan 08)