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tools: bpftool: show that opcodes or file FILE should be exclusive

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For the `bpftool prog dump { jited | xlated } ...` command, adding
`opcodes` keyword (to request opcodes to be printed) will have no effect
if `file FILE` (to write binary output to FILE) is provided.

The manual page and the help message to be displayed in the terminal
should reflect that, and indicate that these options should be mutually
exclusive.

Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Quentin Monnet 2017-10-19 15:46:25 -07:00 committed by David S. Miller
parent 9e2308c133
commit 8dfbc6d1d2
2 changed files with 6 additions and 6 deletions
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8
tools/bpf/bpftool/Documentation/bpftool-prog.rst
View File

@ -11,8 +11,8 @@ SYNOPSIS
========
| **bpftool** prog show [*PROG*]
| **bpftool** prog dump xlated *PROG* [file *FILE*] [opcodes]
| **bpftool** prog dump jited *PROG* [file *FILE*] [opcodes]
| **bpftool** prog dump xlated *PROG* [{file *FILE* | opcodes }]
| **bpftool** prog dump jited *PROG* [{file *FILE* | opcodes }]
| **bpftool** prog pin *PROG* *FILE*
| **bpftool** prog help
|
@ -28,14 +28,14 @@ DESCRIPTION
Output will start with program ID followed by program type and
zero or more named attributes (depending on kernel version).
**bpftool prog dump xlated** *PROG* [**file** *FILE*] [**opcodes**]
**bpftool prog dump xlated** *PROG* [{ **file** *FILE* | **opcodes** }]
Dump eBPF instructions of the program from the kernel.
If *FILE* is specified image will be written to a file,
otherwise it will be disassembled and printed to stdout.
**opcodes** controls if raw opcodes will be printed.
**bpftool prog dump jited** *PROG* [**file** *FILE*] [**opcodes**]
**bpftool prog dump jited** *PROG* [{ **file** *FILE* | **opcodes** }]
Dump jited image (host machine code) of the program.
If *FILE* is specified image will be written to a file,
otherwise it will be disassembled and printed to stdout.

4
tools/bpf/bpftool/prog.c
View File

@ -469,8 +469,8 @@ static int do_help(int argc, char **argv)
{
fprintf(stderr,
"Usage: %s %s show [PROG]\n"
" %s %s dump xlated PROG [file FILE] [opcodes]\n"
" %s %s dump jited PROG [file FILE] [opcodes]\n"
" %s %s dump xlated PROG [{ file FILE | opcodes }]\n"
" %s %s dump jited PROG [{ file FILE | opcodes }]\n"
" %s %s pin PROG FILE\n"
" %s %s help\n"
"\n"