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| author |   Yonghong Song <yhs@fb.com> | 2020-05-09 10:59:20 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-05-09 17:05:27 -0700 |
| commit | 9406b485dea5e25bed7c81cd822747d494cc8bde (patch) | |
| tree | cf9cc5392af40aefce4a272233d977da23bff7a1 /tools/bpf/bpftool/bash-completion | |
| parent | tools/libpf: Add offsetof/container_of macro in bpf_helpers.h (diff) | |
| download | linux-dev-9406b485dea5e25bed7c81cd822747d494cc8bde.tar.xz linux-dev-9406b485dea5e25bed7c81cd822747d494cc8bde.zip | |
tools/bpftool: Add bpf_iter support for bptool
Currently, only one command is supported
bpftool iter pin <bpf_prog.o> <path>
It will pin the trace/iter bpf program in
the object file <bpf_prog.o> to the <path>
where <path> should be on a bpffs mount.
For example,
$ bpftool iter pin ./bpf_iter_ipv6_route.o \
/sys/fs/bpf/my_route
User can then do a `cat` to print out the results:
$ cat /sys/fs/bpf/my_route
fe800000000000000000000000000000 40 00000000000000000000000000000000 ...
00000000000000000000000000000000 00 00000000000000000000000000000000 ...
00000000000000000000000000000001 80 00000000000000000000000000000000 ...
fe800000000000008c0162fffebdfd57 80 00000000000000000000000000000000 ...
ff000000000000000000000000000000 08 00000000000000000000000000000000 ...
00000000000000000000000000000000 00 00000000000000000000000000000000 ...
The implementation for ipv6_route iterator is in one of subsequent
patches.
This patch also added BPF_LINK_TYPE_ITER to link query.
In the future, we may add additional parameters to pin command
by parameterizing the bpf iterator. For example, a map_id or pid
may be added to let bpf program only traverses a single map or task,
similar to kernel seq_file single_open().
We may also add introspection command for targets/iterators by
leveraging the bpf_iter itself.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200509175920.2477247-1-yhs@fb.com
Diffstat (limited to 'tools/bpf/bpftool/bash-completion')
| -rw-r--r-- | tools/bpf/bpftool/bash-completion/bpftool | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/bash-completion/bpftool b/tools/bpf/bpftool/bash-completion/bpftool index fc989ead7313..9f0f20e73b87 100644 --- a/tools/bpf/bpftool/bash-completion/bpftool +++ b/tools/bpf/bpftool/bash-completion/bpftool @@ -610,6 +610,19 @@ _bpftool() ;; esac ;; + iter) + case $command in + pin) + _filedir + return 0 + ;; + *) + [[ $prev == $object ]] && \ + COMPREPLY=( $( compgen -W 'pin help' \ + -- "$cur" ) ) + ;; + esac + ;; map) local MAP_TYPE='id pinned name' case $command in |