Nexus X40 2-port QSFP+ SmartNIC (8-channel) KU035 FPGA The Cisco Nexus NXN-K35-8X, K35-Q FPGA SmartNIC is a 10/40Gbps interface card specifically optimized for low-latency environments. Through the use of QSFP+ breakout cables, it can connect to eight SFP+ ports. This enables a range of high-performance applications such as packet capture across multiple connections, or market-data line arbitration across many different feeds. In addition to a standard Linux driver, a transparent TCP and UDP acceleration library is included, as well as a library for low-level access. A transparent socket acceleration library allows applications to benefit from the low latency of a kernel bypass, in most cases without modifications to the applications. For the most latency-sensitive applications, a library called "libexanic"� allows direct low-level access to the Cisco Nexus K35-Q FPGA SmartNIC hardware and includes simple functions for sending and receiving Ethernet frames. With the optional firmware development kit, it is even possible to extend the SmartNIC firmware and add your own logic to the onboard Field Programmable Gate Array (FPGA). Flow steering delivers packets to the right application's receive buffer. Filters can be defined over Ethernet frame components such as SRC/DST MAC, SRC/DST IP, etc., and a receive buffer associated with that filter. As packets come off the wire, the Cisco Nexus K35-Q FPGA SmartNIC will analyze the traffic and deliver packets that the match filters directly to the correct receive buffer. Nonmatched packets are delivered to the default buffer. This flow steering is done inline at line rate, adding no additional latency. Flow hashing distributes packets evenly across multiple buffers, allowing CPU load to be spread for demanding capture and analysis applications. Built-in timestamping functionality records each frame's arrival time to within 6.2ns. These timestamps are available through a direct API and through Exact Capture, our free and open-source, high-rate capture system. Exact Capture can write tcpdump-compatible captures at line-rate to disk. Additionally, the Cisco Nexus K35-Q FPGA SmartNIC features Pulse-Per-Second (PPS) input and output and supports hardware-accelerated PTP. These can be used to synchronize the SmartNIC clock to external time references (such as a GPS receivers), allowing users to meaningfully compare captured timestamps across multiple servers and geographic locations.
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