NET_EXTENSION_QUERY_INIT function (netadapterpacket.h)
The NET_EXTENSION_QUERY_INIT function initializes a NET_EXTENSION_QUERY structure.
Syntax
void NET_EXTENSION_QUERY_INIT(
[_Out_] NET_EXTENSION_QUERY *Extension,
[_In_] PCWSTR Name,
[_In_] ULONG Version,
[_In_] NET_EXTENSION_TYPE Type
);
Parameters
[_Out_] Extension
A pointer to a driver-allocated NET_EXTENSION_QUERY structure.
[_In_] Name
The name of the extension to be queried.
[_In_] Version
The version of the extension to be queried.
[_In_] Type
A NET_EXTENSION_TYPE value that specifies the type of extension being queried.
Return value
None
Remarks
After calling this function, pass the initialized NET_EXTENSION_QUERY structure to NetTx(Rx)QueueGetExtension to get the offset to that extension in the packet or fragment descriptor.
To prevent re-querying extension offsets too often, call this function and NetTx(Rx)QueueGetExtension from the EvtNetAdapterCreateTx(Rx)Queue callback function after calling NetTx(Rx)QueueCreate, then store the offset in a queue context space.
For more info about extensions, see Packet descriptors and extensions.
For a code example of querying extension offsets, see Transmit and receive queues.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 10, version 2004 |
| Target Platform | Universal |
| Minimum UMDF version | 2.33 |
| Header | netadapterpacket.h (include netadaptercx.h) |
| IRQL | Any level as long as target memory is resident |