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demo for 「eBPF 技术实践:高性能 ACL」为 eBPF 程序注入黑魔法bpf2bpf functions call examplebpf_tail_call() exampleeBPF global variablesXDP metadata 实战指南XDP pingping latency injection with XDP metadataeBPF timereBPF iteratorbinary search in eBPFfentry/fexit on XDP programfentry/fexit on tc-bpf programfentry/fexit on tailcall target program(FAILED)fentry/fexit on bpf2bpf target programfentry/fexit on freplace programfentry/fexit on freplace program (XDP)fentry/fexit on kprobe programfentry/fexit on tracepoint programtracepoint of netlink_extacktailcall shared on multi-processestailcall stack overflow?XDP supports traceroutetailcall in bpf2bpffexit on RPS/XPSfexit on ipv4 sysctl