GIET-VM / NIC Driver

The nic_driver.c​ and nic_driver.h​ files define the NIC driver.

This component is a multi-channels, giga-bit Ethernet network controller. It is an external, non replicated peripheral.

• The _nic_sync_write() and _nic_sync_read() functions use a memcpy strategy to transfer a flow of packets between a chained buffer in kernel space and the NIC internal chained buffer. They are blocking until completion of the transfer.

• The _nic_cma_start() and _nic_cma_stop() functions use the vci_chbuf_dma component to transfer a flow of packets between a chained buffer in kernel space and the NIC internal chained buffer. They are non blocking. In this case, one NIC channel and two CMA channels must be allocated to the task in the mapping_info data structure.

The SEG_NIC_BASE address must be defined in the hard_config.h file.

The addressable registers map is defined here​.

WARNING : All these functions are not completely specified yet.

unsigned int _nic_sync_write( )

To be defined...

unsigned int _nic_sync_read( )

To be defined...

unsigned int _nic_cma_start( )

To be defined...

unsigned int _nic_cma_stop( )

To be defined...

void _nic_rx_isr( unsigned int irq_type, unsigned int irq_id, unsigned int channel )

This interrupt Service Routine handles IRQs from a NIC_RX channel.

void _nic_tx_isr( unsigned int irq_type, unsigned int irq_id, unsigned int channel )

This interrupt Service Routine handles IRQs from a NIC_TX channel.