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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/samples/bpf/tcp_bpf.readme
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   bash
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   echo $$ >> /tmp/cgroupv2/foo/cgroup.procs
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-Anything that runs under this shell belongs to the foo cgroupv2 To load
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+Anything that runs under this shell belongs to the foo cgroupv2. To load
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 (attach) one of the tcp_*_kern.o programs:
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-  ./load_sock_ops -l /tmp/cgroupv2/foo tcp_basertt_kern.o
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+  bpftool prog load tcp_basertt_kern.o /sys/fs/bpf/tcp_prog
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+  bpftool cgroup attach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog
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+  bpftool prog tracelog
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-If the "-l" flag is used, the load_sock_ops program will continue to run
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-printing the BPF log buffer. The tcp_*_kern.o programs use special print
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-functions to print logging information (if enabled by the ifdef).
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+"bpftool prog tracelog" will continue to run printing the BPF log buffer.
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+The tcp_*_kern.o programs use special print functions to print logging
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+information (if enabled by the ifdef).
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 If using netperf/netserver to create traffic, you need to run them under the
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 cgroupv2 to which the BPF programs are attached (i.e. under bash shell
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 To remove (unattach) a socket_ops BPF program from a cgroupv2:
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-  ./load_sock_ops -r /tmp/cgroupv2/foo
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+  bpftool cgroup detach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog