linux-stable/samples/bpf/tcp_bpf.readme
Stanislav Fomichev d78e3f0614 samples/bpf: fix tcp_bpf.readme detach command
Copy-paste, should be detach, not attach.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
2019-07-03 16:52:02 +02:00

28 lines
1.1 KiB
Text

This file describes how to run the tcp_*_kern.o tcp_bpf (or socket_ops)
programs. These programs attach to a cgroupv2. The following commands create
a cgroupv2 and attach a bash shell to the group.
mkdir -p /tmp/cgroupv2
mount -t cgroup2 none /tmp/cgroupv2
mkdir -p /tmp/cgroupv2/foo
bash
echo $$ >> /tmp/cgroupv2/foo/cgroup.procs
Anything that runs under this shell belongs to the foo cgroupv2. To load
(attach) one of the tcp_*_kern.o programs:
bpftool prog load tcp_basertt_kern.o /sys/fs/bpf/tcp_prog
bpftool cgroup attach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog
bpftool prog tracelog
"bpftool prog tracelog" will continue to run printing the BPF log buffer.
The tcp_*_kern.o programs use special print functions to print logging
information (if enabled by the ifdef).
If using netperf/netserver to create traffic, you need to run them under the
cgroupv2 to which the BPF programs are attached (i.e. under bash shell
attached to the cgroupv2).
To remove (unattach) a socket_ops BPF program from a cgroupv2:
bpftool cgroup detach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog