Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) This file describes how to run the tcp_*_kern.o tcp_bpf (or socket_ops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) programs. These programs attach to a cgroupv2. The following commands create
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) a cgroupv2 and attach a bash shell to the group.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)   mkdir -p /tmp/cgroupv2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)   mount -t cgroup2 none /tmp/cgroupv2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)   mkdir -p /tmp/cgroupv2/foo
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)   bash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)   echo $$ >> /tmp/cgroupv2/foo/cgroup.procs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Anything that runs under this shell belongs to the foo cgroupv2. To load
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) (attach) one of the tcp_*_kern.o programs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)   bpftool prog load tcp_basertt_kern.o /sys/fs/bpf/tcp_prog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)   bpftool cgroup attach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)   bpftool prog tracelog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) "bpftool prog tracelog" will continue to run printing the BPF log buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) The tcp_*_kern.o programs use special print functions to print logging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) information (if enabled by the ifdef).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) If using netperf/netserver to create traffic, you need to run them under the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) cgroupv2 to which the BPF programs are attached (i.e. under bash shell
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) attached to the cgroupv2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) To remove (unattach) a socket_ops BPF program from a cgroupv2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)   bpftool cgroup detach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog