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bpftool: add peek command 

This is intended to be used with queues and stacks and be more
user-friendly than 'lookup' without key/value.

Example:
bpftool map create /sys/fs/bpf/q type queue value 4 entries 10 name q
bpftool map update pinned /sys/fs/bpf/q value 0 1 2 3
bpftool map peek pinned /sys/fs/bpf/q
value: 00 01 02 03

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Stanislav Fomichev 2019-01-16 11:10:02 -08:00 committed by Daniel Borkmann
parent 04a5d323e6
commit 66cf6e0b12
2 changed files with 7 additions and 1 deletions
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4
tools/bpf/bpftool/Documentation/bpftool-map.rst
View File

@ -31,6 +31,7 @@ MAP COMMANDS
| **bpftool** **map delete** *MAP* **key** *DATA*
| **bpftool** **map pin** *MAP* *FILE*
| **bpftool** **map event_pipe** *MAP* [**cpu** *N* **index** *M*]
| **bpftool** **map peek** *MAP*
| **bpftool** **map help**
|
| *MAP* := { **id** *MAP_ID* | **pinned** *FILE* }
@ -107,6 +108,9 @@ DESCRIPTION
replace any existing ring. Any other application will stop
receiving events if it installed its rings earlier.
**bpftool map peek** *MAP*
Peek next **value** in the queue or stack.
**bpftool map help**
Print short help message.

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

@ -1168,6 +1168,7 @@ static int do_help(int argc, char **argv)
" %s %s delete MAP key DATA\n"
" %s %s pin MAP FILE\n"
" %s %s event_pipe MAP [cpu N index M]\n"
" %s %s peek MAP\n"
" %s %s help\n"
"\n"
" " HELP_SPEC_MAP "\n"
@ -1185,7 +1186,7 @@ static int do_help(int argc, char **argv)
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
bin_name, argv[-2]);
bin_name, argv[-2], bin_name, argv[-2]);
return 0;
}
@ -1202,6 +1203,7 @@ static const struct cmd cmds[] = {
{ "pin", do_pin },
{ "event_pipe", do_event_pipe },
{ "create", do_create },
{ "peek", do_lookup },
{ 0 }
};