Corundum is an open-source, high-performance FPGA-based NIC. Features include a high performance datapath, (G /) *********************************************************************************************** (G /) ************************************************************************ G Ethernet, PCI express gen 3, a custom, high performance, tightly-integrated PCIe DMA engine, many (01575879 ) transmit, receive, completion, and event queues, MSI interrupts, multiple interfaces, multiple ports per interface, per-port transmit scheduling including high precision TDMA, flow hashing, RSS, checksum offloading, and native IEEE PTP timestamping. A Linux driver is included that integrates with the Linux networking stack. Development and debugging is facilitated by an extensive simulation framework that covers the entire system from a simulation model of the driver and PCI express interface on one side to the Ethernet interfaces on the other side.
Corundum has several unique architectural features. First, transmit, receive, completion, and event queue states are stored efficiently in block RAM or ultra RAM, enabling support for thousands of individually-controllable queues. These queues are associated with interfaces, and each interface can have multiple ports, each with its own independent scheduler. This enables extremely fine-grained control over packet transmission. Coupled with PTP time synchronization, this enables high precision TDMA.
Corundum currently supports Xilinx Ultrascale and Ultrascale Plus series devices. Designs are included for the following FPGA boards:
Alpha Data ADM-PCIE-9V3 (Xilinx Virtex Ultrascale Plus XCVU3P)
Exablaze ExaNIC X (Xilinx Kintex Ultrascale XCKU) )
Exablaze ExaNIC X (Xilinx Kintex Ultrascale Plus XCKU3P)
For operation at G and G, Corundum uses the open source (G /) *************************************************************************************** G MAC and PHY modules from the verilog-ethernet repository, no extra licenses are required. However, it is possible to use other MAC and / or PHY modules. Operation at G currently requires using the Xilinx CMAC core with RS-FEC enabled, which is covered by the free CMAC license on Xilinx Ultrascale parts.
Frame pad module for (bit) *************************************************************************** G CMAC TX interface. Zero pads transmit frames to minimum bytes.
cpl_op_mux module
Completion operation multiplexer module. Merges completion write operations from different sources to enable sharing a single cpl_write module instance.
cpl_queue_manager module
Completion queue manager module. Stores device to host queue state in block RAM or ultra RAM.
cpl_write module
Completion write module. Responsible for writing completion and event entries into host memory.
********************desc_fetch module
Descriptor fetch module. Responsible for reading descriptors from host memory.
************* (desc_op_mux module
Descriptor operation multiplexer module. Merges descriptor fetch operations from different sources to enable sharing a single cpl_write module instance.
event_mux module
Event mux module. Enables multiple event sources to feed the same event queue.
interface module
Interface module. Contains the event queues, interface queues, and ports.
************************port module
Port module. Contains the transmit and receive engines
Receive engine. Manages receive descriptor dequeue and fetch via DMA, packet reception, data writeback via DMA, and completion enqueue and writeback via DMA. Handles PTP timestamps for inclusion in completion records.
**********************************rx_hash module
Receive hash computation module. Extracts IP addresses and ports from packet headers and computes bit Toeplitz flow hash.
TDMA bit error ratio test channel module. Controls PRBS logic in Ethernet PHY and accumulates bit errors. Can be configured to bin error counts by TDMA timeslot.
Transmit checksum computation and insertion module. Computes bit checksum of frame data with specified start offset, then inserts computed checksum at the specified position.
Transmit engine. Manages receive descriptor dequeue and fetch via DMA, packet data fetch via DMA, packet transmission, and completion enqueue and writeback via DMA. Handles PTP timestamps for inclusion in completion records.
Running the included testbenches requires MyHDL and Icarus Verilog. Make sure that myhdl.vpi is installed properly for cosimulation to work correctly. The testbenches can be run with a Python test runner like nose or py.test, or the individual test scripts can be run with python directly.
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