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author | Lawrence Brakmo <brakmo@fb.com> | 2017-10-20 21:05:43 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2017-10-22 05:12:05 +0300 |
commit | bfdf75693875fd53d6f08d5fec9506a864f07372 (patch) | |
tree | f9043ce7c3f1f8ab0304477bb7af8d86cc8b617c | |
parent | c890063e440456e75c2e70f6bcec3797f1771eb6 (diff) | |
download | linux-bfdf75693875fd53d6f08d5fec9506a864f07372.tar.xz |
bpf: create samples/bpf/tcp_bpf.readme
Readme file explaining how to create a cgroupv2 and attach one
of the tcp_*_kern.o socket_ops BPF program.
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked_by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r-- | samples/bpf/tcp_bbf.readme | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/samples/bpf/tcp_bbf.readme b/samples/bpf/tcp_bbf.readme new file mode 100644 index 000000000000..831fb601e3c9 --- /dev/null +++ b/samples/bpf/tcp_bbf.readme @@ -0,0 +1,26 @@ +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: + + ./load_sock_ops -l /tmp/cgroupv2/foo tcp_basertt_kern.o + +If the "-l" flag is used, the load_sock_ops program 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: + + ./load_sock_ops -r /tmp/cgroupv2/foo |