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AF_XDP UMEM Ring Buffer Pointer Arithmetic

Hard · networking · Quant Developer interview question · af-xdp, umem, ring-buffer, networking, zero-copy, bit-manipulation, dpdk

AF_XDP (eXpress Data Path) provides high-performance packet processing by bypassing the kernel network stack. It uses a shared memory region (UMEM) with lock-free ring buffers, whose state is managed by monotonically increasing producer/consumer indices. In quantitative finance, HFT systems leverage this mechanism for sub-microsecond latency when processing millions of market data messages per second. Task Implement the function compute_umem_ring_stats(int ring_size, int producer, int consumer)