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| -rw-r--r-- | samples/bpf/tcp_bpf.readme | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/samples/bpf/tcp_bpf.readme b/samples/bpf/tcp_bpf.readme new file mode 100644 index 000000000..78e247f62 --- /dev/null +++ b/samples/bpf/tcp_bpf.readme @@ -0,0 +1,28 @@ +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 |