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This callback indicates to a client driver that polling (of EvtPacketQueueAdvance or EvtPacketQueueCancel) will stop and will not continue until the client driver calls NetTxQueueNotifyMoreCompletedPacketsAvailable or NetRxQueueNotifyMoreReceivedPacketsAvailable. When a client driver receives new packets in a packet queue's net rings, NetAdapterCx invokes the client driver's EvtPacketQueueSetNotificationEnabled callback function. Enabling and disabling packet queue notification For an example of implementing EvtPacketQueueAdvance for a receive queue, see Receiving network data with net rings.

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During EvtPacketQueueAdvance, client drivers carry out send and receive operations on the net rings by controlling indices within the rings, transferring buffer ownership between hardware and the OS as data is transmitted or received.įor more information about net rings, see Introduction to net rings.įor an example of implementing EvtPacketQueueAdvance for a transmit queue, see Sending network data with net rings. Each packet queue in a client driver is backed by underlying data structures called net rings, which contain or link to the actual network data buffers in system memory. Polling operations occur within the client driver's EvtPacketQueueAdvance callback function.

The client driver returns the completed packets to the OS.

The client driver programs the packets to hardware.

The OS gives buffers to the client driver for either transmitting or receiving.

The sequence of a polling operation on a packet queue is as follows: The polling model is implemented by calling the client driver's queue advance callbacks, as shown in the following figure: The NetAdapter data path is a polling model, and the polling operation on one packet queue is completely independent of other queues. NetRxQueueGetExtension(rxQueue, &extension, &queueContext->ChecksumExtension)

Query the checksum packet extension offset and store it in the context PMY_RX_QUEUE_CONTEXT queueContext = GetMyRxQueueContext(rxQueue) NTSTATUSĬonst ULONG queueId = NetRxQueueInitGetQueueId(RxQueueInit)

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Error handling code has been left out of this example for clarity. The following example shows how creating a receive queue might look in code. To create a receive queue from EVT_NET_ADAPTER_CREATE_RXQUEUE, use the same pattern as a transmit queue and call NetRxQueueCreate. NetTxQueueGetExtension(txQueue, &extension, &queueContext->LsoExtension) Query Large Send Offload packet extension offset and store it in the context NetTxQueueGetExtension(txQueue, &extension, &queueContext->ChecksumExtension) NET_PACKET_EXTENSION_CHECKSUM_VERSION_1) Query checksum packet extension offset and store it in the context PMY_TX_QUEUE_CONTEXT queueContext = GetMyTxQueueContext(txQueue) Get the queue context for storing the queue ID and packet extension offset info Optional: register the queue's start and stop callbacksĬonst ULONG queueId = NetTxQueueInitGetQueueId(TxQueueInit)

The following example shows how these steps might look in code.

If NetTxQueueCreate fails, the EvtNetAdapterCreateTxQueue callback function should return an error code.

Call NetTxQueueCreate to allocate a queue.

Call NetTxQueueInitGetQueueId to retrieve the identifier of the transmit queue to set up.

Optionally register start and stop callbacks for the queue.

During this callback, client drivers typically do the following:

NetAdapterCx calls EVT_NET_ADAPTER_CREATE_TXQUEUE at the very end of the power-up sequence. In addition, the client can provide these optional callback functions after initializing the queue configuration structure:

EVT_PACKET_QUEUE_SET_NOTIFICATION_ENABLED.

When creating a packet queue, either a transmit queue or a receive queue, the client must provide pointers to the following three callback functions: The framework empties queues before transitioning to a low power state and deletes them before deleting the adapter. The client creates transmit and receive queues in these callbacks respectively. When your client driver calls NET_ADAPTER_DATAPATH_CALLBACKS_INIT, typically from its EVT_WDF_DRIVER_DEVICE_ADD event callback function, it provides two queue creation callbacks: EVT_NET_ADAPTER_CREATE_TXQUEUE and EVT_NET_ADAPTER_CREATE_RXQUEUE.

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This topic explains how to work with transmit and receive queues in NetAdapterCx.

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Packet queues, or datapath queues are objects introduced in NetAdapterCx to enable client drivers to model their hardware features, such as hardware transmit and receive queues, more explicitly in software drivers.