linux/tools/bpf/bpftool
Jakub Kicinski a98bf57391 tools: bpftool: add support for reporting the effective cgroup progs
Takshak said in the original submission:

With different bpf attach_flags available to attach bpf programs specially
with BPF_F_ALLOW_OVERRIDE and BPF_F_ALLOW_MULTI, the list of effective
bpf-programs available to any sub-cgroups really needs to be available for
easy debugging.

Using BPF_F_QUERY_EFFECTIVE flag, one can get the list of not only attached
bpf-programs to a cgroup but also the inherited ones from parent cgroup.

So a new option is introduced to use BPF_F_QUERY_EFFECTIVE query flag here
to list all the effective bpf-programs available for execution at a specified
cgroup.

Reused modified test program test_cgroup_attach from tools/testing/selftests/bpf:
  # ./test_cgroup_attach

With old bpftool:

 # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/
  ID       AttachType      AttachFlags     Name
  271      egress          multi           pkt_cntr_1
  272      egress          multi           pkt_cntr_2

Attached new program pkt_cntr_4 in cg2 gives following:

 # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/cg2
  ID       AttachType      AttachFlags     Name
  273      egress          override        pkt_cntr_4

And with new "effective" option it shows all effective programs for cg2:

 # bpftool cgroup show /sys/fs/cgroup/cgroup-test-work-dir/cg1/cg2 effective
  ID       AttachType      AttachFlags     Name
  273      egress          override        pkt_cntr_4
  271      egress          override        pkt_cntr_1
  272      egress          override        pkt_cntr_2

Compared to original submission use a local flag instead of global
option.

We need to clear query_flags on every command, in case batch mode
wants to use varying settings.

v2: (Takshak)
 - forbid duplicated flags;
 - fix cgroup path freeing.

Signed-off-by: Takshak Chahande <ctakshak@fb.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Takshak Chahande <ctakshak@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-07-30 21:15:02 -07:00
..
bash-completion tools: bpftool: add support for reporting the effective cgroup progs 2019-07-30 21:15:02 -07:00
Documentation tools: bpftool: add support for reporting the effective cgroup progs 2019-07-30 21:15:02 -07:00
.gitignore bpftool: exclude bash-completion/bpftool from .gitignore pattern 2019-05-04 23:43:57 -07:00
btf_dumper.c bpf: bpftool support for dumping data/bss/rodata sections 2019-04-09 17:05:47 -07:00
btf.c bpftool: add C output format option to btf dump subcommand 2019-05-24 14:05:58 -07:00
cfg.c tools: bpftool: teach cfg code about JMP32 2019-01-26 13:33:01 -08:00
cfg.h tools: bpftool: replace Netronome boilerplate with SPDX license headers 2018-12-13 12:08:44 +01:00
cgroup.c tools: bpftool: add support for reporting the effective cgroup progs 2019-07-30 21:15:02 -07:00
common.c bpf: use libbpf_num_possible_cpus internally 2019-06-11 10:36:02 +02:00
feature.c bpftool: feature probing, change default action 2019-01-24 10:47:52 +01:00
jit_disasm.c tools: bpftool: Fix json dump crash on powerpc 2019-07-05 23:50:38 +02:00
json_writer.c tools: bpftool: Cleanup license mess 2019-01-18 15:26:54 -08:00
json_writer.h tools: bpftool: Cleanup license mess 2019-01-18 15:26:54 -08:00
main.c tools: bpftool: add "prog run" subcommand to test-run programs 2019-07-05 23:48:07 +02:00
main.h tools: bpftool: add raw_tracepoint_writable prog type to header 2019-07-12 15:14:42 +02:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
map_perf_ring.c tools/bpftool: switch map event_pipe to libbpf's perf_buffer 2019-07-08 15:35:43 +02:00
map.c tools: Add definitions for devmap_hash map type 2019-07-29 13:50:48 -07:00
net.c bpftool: show flow_dissector attachment status 2019-04-25 23:49:06 +02:00
netlink_dumper.c tools: bpftool: dual license all files 2018-12-13 12:08:44 +01:00
netlink_dumper.h tools: bpftool: dual license all files 2018-12-13 12:08:44 +01:00
perf.c tools: bpftool: dual license all files 2018-12-13 12:08:44 +01:00
prog.c tools: bpftool: add "prog run" subcommand to test-run programs 2019-07-05 23:48:07 +02:00
tracelog.c tools: bpftool: add an option to prevent auto-mount of bpffs, tracefs 2018-12-18 14:47:17 +01:00
xlated_dumper.c bpf: style fix in while(!feof()) loop 2019-05-28 10:54:01 +02:00
xlated_dumper.h tools: bpftool: replace Netronome boilerplate with SPDX license headers 2018-12-13 12:08:44 +01:00