P4080 PCIe Adapter SDK User Guide Production Release

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Freescale Semiconductor shares this address with Hardware Function Drivers during registration. The address is the Host domain’s PCIe address that gets translated into P4080 domain’s address. o msi_status – Used to differentiate between Rx interrupt and Tx confirmation interrupt. This is set and cleared by the Hardware Function Driver and checked by the Host Packet Driver for knowing the type of interrupt. o tx_ring – Transmit descriptor rings allocated by Host Packet Driver and are shared with Hardware Function Driver. o rx_ring – Receive descriptor rings allocated by Host Packet Driver and are shared with Hardware Function Driver. o priv_cb_arg – Argument pointer for the interrupt callback function. o priv_cb – Rx ring interrupt callback function that is invoked when an interrupt is received for a Hardware Function Driver. The Hardware Function is chosen based on the MSI status value which is maintained for each Hardware Function. Its description is given after this API description. o cmd_cb – Command ring interrupt callback function that is invoked when an interrupt is received for a Hardware Function. Its description is given after this API description. o tx_ring_count – Transmit ring count that is shared with P4080 Packet Driver. This parameter is used to share the transmit ring count with Hardware Function Driver. o rx_ring_count – Receive ring count that is shared with P4080 Packet Driver. This parameter is used to share the receive ring count with Hardware Function Driver. o fd_size – Size of the Host Frame Descriptor. struct p4080_fd_ring { void *desc; struct net_device_stats stats; u64 dma; © Freescale Semiconductor, Inc., 2011. All rights reserved. Freescale Confidential Proprietary Page 68
Freescale Semiconductor u64 *rpi; u64 *rci; volatile u64 lpi; volatile u64 lci; volatile u64 lfi; u32 size; u32 count; u32 fd_size; atomic_t free_cnt; atomic_t state; u32 cpu; void *p4080_desc; } p4080_fd_ring_t; o desc – Pointer to the FDs in the Host Tx/Rx ring. o stats – Device specific statistics per ring. o dma – Physical address of the FD ring. o rpi – Producer index located in P4080 memory. o rci – Consumer index located in P4080 memory. o lci – Consumer index located in Host memory. o lpi – Producer index located in Host memory. o lfi – Refill index maintained in Host memory for Rx ring. o size – Length of descriptor ring in bytes o count – Number of descriptors in the ring © Freescale Semiconductor, Inc., 2011. All rights reserved. Freescale Confidential Proprietary Page 69
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