FN_VMB_CHANNEL_INIT_SET_MAXIMUM_EXTERNAL_DATA callback function (vmbuskernelmodeclientlibapi.h)
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The VmbChannelInitSetMaximumExternalData function sets the maximum size and chain length of data that is described by a packet, but not directly sent in the packet. That is, the maximum size of the buffer described by an ExternalDataMdl.
Syntax
FN_VMB_CHANNEL_INIT_SET_MAXIMUM_EXTERNAL_DATA FnVmbChannelInitSetMaximumExternalData;
NTSTATUS FnVmbChannelInitSetMaximumExternalData(
VMBCHANNEL Channel,
UINT32 DataSize,
UINT32 ChainLength
)
{...}
Parameters
Channel
A pointer to a Kernel Mode Client Library (KMCL) channel.
DataSize
The maximum size of external data.
ChainLength
The maximum number of Memory Descriptor Lists (MDLs) in an incoming MDL chain.
Return value
VmbChannelInitSetMaximumExternalData can return one of the following status values:
| Return code | Description |
|---|---|
|
The function finished successfully. |
|
The Channel value was invalid or in an invalid state, such as Disabled. |
|
The DataSize value is invalid. Zero (0) is invalid. |
|
The ChainLength value is invalid. Zero (0) is invalid. |
Remarks
The KMCL ensures that your ring buffers are large enough to send packets that contain buffers in the specified limits.
Important
This function is called through the VMBus Kernel Mode Client Library (KMCL) interface, provided by the Vmbkmcl.sys bus driver. This is a client function accessed from the KMCL_CLIENT_INTERFACE_V1 structure.
For more information, see the Remarks section of the KMCL_CLIENT_INTERFACE_V1.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 10, version 1803 |
| Header | vmbuskernelmodeclientlibapi.h |