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bpftool: Match programs by name

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When working with frequently modified BPF programs, both the ID and the
tag may change.  bpftool currently doesn't provide a "stable" way to match
such programs.

This patch implements lookup by name for programs.  The show and dump
commands will return all programs with the given name, whereas other
commands will error out if several programs have the same name.

Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Link: https://lore.kernel.org/bpf/b5fc1a5dcfaeb5f16fc80295cdaa606dd2d91534.1576263640.git.paul.chaignon@gmail.com
This commit is contained in:
Paul Chaignon
2019-12-13 20:10:17 +01:00
committed by Alexei Starovoitov
parent ec2025095c
commit a7d22ca2a4
5 changed files with 42 additions and 18 deletions
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12
tools/bpf/bpftool/Documentation/bpftool-prog.rst
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@@ -33,7 +33,7 @@ PROG COMMANDS
| **bpftool** **prog help**
|
| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* | **name** *PROG_NAME* }
| *TYPE* := {
| **socket** | **kprobe** | **kretprobe** | **classifier** | **action** |
| **tracepoint** | **raw_tracepoint** | **xdp** | **perf_event** | **cgroup/skb** |
@@ -55,8 +55,8 @@ DESCRIPTION
Show information about loaded programs. If *PROG* is
specified show information only about given programs,
otherwise list all programs currently loaded on the system.
In case of **tag**, *PROG* may match several programs which
will all be shown.
In case of **tag** or **name**, *PROG* may match several
programs which will all be shown.
Output will start with program ID followed by program type and
zero or more named attributes (depending on kernel version).
@@ -75,9 +75,9 @@ DESCRIPTION
output in human-readable format. In this case, **opcodes**
controls if raw opcodes should be printed as well.
In case of **tag**, *PROG* may match several programs which
will all be dumped. However, if **file** or **visual** is
specified, *PROG* must match a single program.
In case of **tag** or **name**, *PROG* may match several
programs which will all be dumped. However, if **file** or
**visual** is specified, *PROG* must match a single program.
If **file** is specified, the binary image will instead be
written to *FILE*.