133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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frame.h
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Abstract:
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Author:
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Thomas J. Dimitri (TommyD) 08-May-1992
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Environment:
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Kernel Mode - Or whatever is the equivalent on OS/2 and DOS.
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Revision History:
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--*/
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// first, some default values
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// the ethernet max frame size is 1500+6+6+2 = 1514
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/* Note that this only applies to non-PPP framing. See below.
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*/
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#define DEFAULT_MAX_FRAME_SIZE 1514
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/* The hard-coded PPP maximum frame sizes for send and receive paths.
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**
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** Note: TommyD had these hard-coded. I have simply made this more explicit
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** by removing their attachment to MaxFrameSize which was causing
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** problems for NT31 RAS compression. The doubling is for PPP
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** byte-stuffing, the PPP_PADDING to adjust for possible VJ expansion,
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** and the 100...well, ask TommyD...and the 14 to limit exposure, i.e.
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** wind up with the exact number TommyD was using.
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*/
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#define DEFAULT_PPP_MAX_FRAME_SIZE 1500
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#define DEFAULT_EXPANDED_PPP_MAX_FRAME_SIZE ((DEFAULT_PPP_MAX_FRAME_SIZE*2)+PPP_PADDING+100+14)
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// ChuckL says 5 is a good default irp stack size
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// perhaps we should lower this though since it's typically just 1
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// but what if the com port is redirected??
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#define DEFAULT_IRP_STACK_SIZE 5
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#define SLIP_END_BYTE 192
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#define SLIP_ESC_BYTE 219
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#define SLIP_ESC_END_BYTE 220
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#define SLIP_ESC_ESC_BYTE 221
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#define PPP_FLAG_BYTE 0x7e
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#define PPP_ESC_BYTE 0x7d
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// define the number of framesPerPort
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/* The NT35 setting, where sends are IRPed directly from the input buffer
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** passed down from NDISWAN.
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*/
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#define DEFAULT_FRAMES_PER_PORT 1
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// define if xon/xoff capability is on by default (off)
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#define DEFAULT_XON_XOFF 0
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// the mininmum timeout value per connection in ms
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#define DEFAULT_TIMEOUT_BASE 500
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// the multiplier based on the baud rate tacked on to the base in ms
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#define DEFAULT_TIMEOUT_BAUD 28800
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// the timeout to use if we drop a frame in ms
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#define DEFAULT_TIMEOUT_RESYNC 500
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typedef struct ASYNC_FRAME_HEADER ASYNC_FRAME_HEADER, *PASYNC_FRAME_HEADER;
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struct ASYNC_FRAME_HEADER {
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UCHAR SyncByte; // 0x16
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UCHAR FrameType; // 0x01, 0x02 (directed vs. multicast)
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// 0x08 compression
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UCHAR HighFrameLength;
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UCHAR LowFrameLength;
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};
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typedef struct ASYNC_FRAME_TRAILER ASYNC_FRAME_TRAILER, *PASYNC_FRAME_TRAILER;
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struct ASYNC_FRAME_TRAILER {
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UCHAR EtxByte; // 0x03
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UCHAR LowCRCByte;
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UCHAR HighCRCByte;
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};
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typedef ULONG FRAME_ID;
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typedef struct ASYNC_ADAPTER ASYNC_ADAPTER, *PASYNC_ADAPTER;
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typedef struct ASYNC_INFO ASYNC_INFO, *PASYNC_INFO;
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typedef struct ASYNC_FRAME ASYNC_FRAME, *PASYNC_FRAME;
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struct ASYNC_FRAME {
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// For PPP/SLIP.
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ULONG WaitMask; // Mask bits when IRP completes
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#if 0
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PIRP Irp; // Irp allocated based on DefaultIrpStackSize.
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#if DBG
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ULONG Line;
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CHAR *File;
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#endif
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#endif
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UINT FrameLength; // Size of Frame allocated.
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PUCHAR Frame; // Buffer allocated based on
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// DefaultFrameSize
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WORK_QUEUE_ITEM WorkItem; // For stack overflow reads
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PASYNC_ADAPTER Adapter; // back ptr to adapter
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PASYNC_INFO Info; // back ptr to info field
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NDIS_HANDLE MacBindingHandle;
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NDIS_HANDLE NdisBindingContext;
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};
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NTSTATUS
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AsyncGetFrameFromPool(
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IN PASYNC_INFO Info,
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OUT PASYNC_FRAME *NewFrame );
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