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authorLawrence Brakmo <brakmo@fb.com>2017-10-20 11:05:43 -0700
committerDavid S. Miller <davem@davemloft.net>2017-10-22 03:12:05 +0100
commitbfdf75693875fd53d6f08d5fec9506a864f07372 (patch)
treef9043ce7c3f1f8ab0304477bb7af8d86cc8b617c /samples
parentbpf: sample BPF_SOCKET_OPS_BASE_RTT program (diff)
downloadlinux-dev-bfdf75693875fd53d6f08d5fec9506a864f07372.tar.xz
linux-dev-bfdf75693875fd53d6f08d5fec9506a864f07372.zip
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>
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+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