pipe.cpp File Reference

#include "ucx01000.h"
#include <debug.h>

Include dependency graph for pipe.cpp:

Go to the source code of this file.

Macros
#define	NDEBUG
#define	UCX_KB(x)   ((x) * 1024UL)
#define	UCX_MB(x)   ((x) * 1024UL * 1024UL)

Functions
static ULONG NTAPI	UcxSpeedRow (_In_ USB_DEVICE_SPEED Speed)
static BOOLEAN NTAPI	UcxIsSlowSpeed (_In_ USB_DEVICE_SPEED Speed)
ULONG NTAPI	UcxComputeMaxTransferSize (_In_ USB_DEVICE_SPEED Speed, _In_ USHORT BcdUsb, _In_ const UcxEndpointInit *Init)
static VOID NTAPI	UcxUntrackEndpoint (_In_ UcxEndpoint *Endpoint)

Variables
static const ULONG	UcxMaxTransferTable [4][5]

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 10 of file pipe.cpp.

UCX_KB

#define UCX_KB

(

x

)

((x) * 1024UL)

Definition at line 15 of file pipe.cpp.

UCX_MB

#define UCX_MB

(

x

)

((x) * 1024UL * 1024UL)

Definition at line 16 of file pipe.cpp.

Function Documentation

UcxComputeMaxTransferSize()

ULONG NTAPI UcxComputeMaxTransferSize	(	_In_ USB_DEVICE_SPEED	Speed,
		_In_ USHORT	BcdUsb,
		_In_ const UcxEndpointInit *	Init
	)

Definition at line 49 of file pipe.cpp.

{
    ULONG Row = UcxSpeedRow(Speed);
    USHORT MaxPacket;
    ULONG PacketBytes;
 
    if (Init->TransferType != UcxTransferType::Isochronous)
    {
        if (Init->TransferType == UcxTransferType::Control &&
            UcxIsSlowSpeed(Speed) &&
            UcxDriver.Allow64KLowOrFullSpeedControl)
        {
            return UCX_KB(64);
        }
 
        return UcxMaxTransferTable[Row][(ULONG)Init->TransferType];
    }
 
    if (Row == (ULONG)UsbSuperSpeed)
    {
        if (Init->Companion.bmAttributes.Isochronous.SspCompanion)
            return 1024 * Init->IsochCompanion.dwBytesPerInterval;
 
        return 1024 * Init->Companion.wBytesPerInterval;
    }
 
    /* Before USB 2.5 the top bits carry the additional transactions per microframe */
    MaxPacket = Init->Descriptor.wMaxPacketSize;
    if (BcdUsb < 0x0250)
        PacketBytes = (MaxPacket & 0x7FF) * (((MaxPacket >> 11) & 0x3) + 1);
    else
        PacketBytes = MaxPacket;
 
    return ((Row == (ULONG)UsbHighSpeed) ? 1024 : 256) * PacketBytes;
}

Referenced by UcxEndpoint::Initialize().

UcxIsSlowSpeed()

static BOOLEAN NTAPI UcxIsSlowSpeed ( _In_ USB_DEVICE_SPEED  Speed )

static

Definition at line 41 of file pipe.cpp.

{
    return Speed == UsbLowSpeed || Speed == UsbFullSpeed;
}

Referenced by UcxEndpoint::Initialize(), and UcxComputeMaxTransferSize().

UcxSpeedRow()

static ULONG NTAPI UcxSpeedRow ( _In_ USB_DEVICE_SPEED  Speed )

static

Definition at line 32 of file pipe.cpp.

{
    return ((ULONG)Speed > (ULONG)UsbSuperSpeed) ? (ULONG)UsbSuperSpeed : (ULONG)Speed;
}

Referenced by UcxComputeMaxTransferSize().

UcxUntrackEndpoint()

static VOID NTAPI UcxUntrackEndpoint ( _In_ UcxEndpoint *  Endpoint )

static

Takes the endpoint out of the strict pipe handle list, if it is on it.

Definition at line 825 of file pipe.cpp.

{
    UcxUsbDevice* Device = Endpoint->m_Device;
 
    if (!Device->m_StalePipeIoAllowed)
        return;
 
    SpinLockGuard Guard(&Device->m_TrackingLock);
 
    if (UcxIsListEntryLinked(&Endpoint->m_TrackingLink))
    {
        RemoveEntryList(&Endpoint->m_TrackingLink);
        UcxClearListEntry(&Endpoint->m_TrackingLink);
    }
}

Referenced by EndpointMachine::DeleteEndpoint(), and EndpointMachine::ParkAsStale().

Variable Documentation

UcxMaxTransferTable

const ULONG UcxMaxTransferTable[4][5]

static

Initial value:

=
{
    
    {  0,       UCX_KB(4),   UCX_MB(4),  0,     UCX_MB(4) },
    {  0,       UCX_KB(4),   UCX_MB(4),  0,     UCX_MB(4) },
    {  0,       UCX_KB(64),  UCX_MB(4),  0,     UCX_MB(4) },
    {  0,       UCX_KB(64),  UCX_MB(32), 0,     UCX_MB(4) }
}

Definition at line 19 of file pipe.cpp.

Referenced by UcxComputeMaxTransferSize().