P4080 PCIe Adapter SDK User Guide Production Release

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Freescale Semiconductor Rx Path qman_poll() API invokes the FQ specific callbacks registered by Ethernet Hardware Function Library during FQ init. In each callback invocation, the Rx Flow Table is looked up to determine the corresponding Host Rx ring ID. For every Ethernet Rx packet, the pkt_drv_enqueue_host_ring() API is invoked to transfer the Rx packet to host memory. In this API, it is verified if the Rx ring has some free FDs. If there are free FDs, the DMA of Rx data is initiated from P4080 to Host memory by obtaining the Host address from Rx shadow ring’s FD. The necessary fields inFD of the Host Rx Descriptor ring are modified and the Host producer index is updated. The dma_channel_poll() API, invoked by the application thread checks for DMA completions. If it finds Rx DMA completions, an MSI interrupt is sent to the Host to notify of an Rx packet. © Freescale Semiconductor, Inc., 2011. All rights reserved. Freescale Confidential Proprietary Page 20
Freescale Semiconductor 4.6 Command Ring Processing Figure 5: Call flow between USDPAA process and Libraries Command ring is used to send special purpose requests from Host to P4080. These sent requests can be specific to a Hardware Function or specific to a PCIe Packet Driver. To send a new command, the command requester (Host Hardware Function Driver or Host Packet Driver) prepares a command data structure of type “struct p4080_fd_t” and fills “type” and © Freescale Semiconductor, Inc., 2011. All rights reserved. Freescale Confidential Proprietary Page 21
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P4080 PCIe Adapter SDK User Guide Production Release

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