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tools: bpftool: add map create command 

Add a way of creating maps from user space.  The command takes
as parameters most of the attributes of the map creation system
call command.  After map is created its pinned to bpffs.  This makes
it possible to easily and dynamically (without rebuilding programs)
test various corner cases related to map creation.

Map type names are taken from bpftool's array used for printing.
In general these days we try to make use of libbpf type names, but
there are no map type names in libbpf as of today.

As with most features I add the motivation is testing (offloads) :)

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jakub Kicinski 2018-10-15 16:30:36 -07:00 committed by Alexei Starovoitov
parent 2f1d774f7d
commit 0b592b5a01
6 changed files with 183 additions and 6 deletions
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15
tools/bpf/bpftool/Documentation/bpftool-map.rst
View File

@ -15,13 +15,15 @@ SYNOPSIS
*OPTIONS* := { { **-j** | **--json** } [{ **-p** | **--pretty** }] | { **-f** | **--bpffs** } }
*COMMANDS* :=
{ **show** | **list** | **dump** | **update** | **lookup** | **getnext** | **delete**
| **pin** | **help** }
{ **show** | **list** | **create** | **dump** | **update** | **lookup** | **getnext**
| **delete** | **pin** | **help** }
MAP COMMANDS
=============
| **bpftool** **map { show | list }** [*MAP*]
| **bpftool** **map create** *FILE* **type** *TYPE* **key** *KEY_SIZE* **value** *VALUE_SIZE* \
| **entries** *MAX_ENTRIES* **name** *NAME* [**flags** *FLAGS*] [**dev** *NAME*]
| **bpftool** **map dump** *MAP*
| **bpftool** **map update** *MAP* **key** *DATA* **value** *VALUE* [*UPDATE_FLAGS*]
| **bpftool** **map lookup** *MAP* **key** *DATA*
@ -36,6 +38,11 @@ MAP COMMANDS
| *PROG* := { **id** *PROG_ID* | **pinned** *FILE* | **tag** *PROG_TAG* }
| *VALUE* := { *DATA* | *MAP* | *PROG* }
| *UPDATE_FLAGS* := { **any** | **exist** | **noexist** }
| *TYPE* := { **hash** | **array** | **prog_array** | **perf_event_array** | **percpu_hash**
| | **percpu_array** | **stack_trace** | **cgroup_array** | **lru_hash**
| | **lru_percpu_hash** | **lpm_trie** | **array_of_maps** | **hash_of_maps**
| | **devmap** | **sockmap** | **cpumap** | **xskmap** | **sockhash**
| | **cgroup_storage** | **reuseport_sockarray** | **percpu_cgroup_storage** }
DESCRIPTION
===========
@ -47,6 +54,10 @@ DESCRIPTION
Output will start with map ID followed by map type and
zero or more named attributes (depending on kernel version).
**bpftool map create** *FILE* **type** *TYPE* **key** *KEY_SIZE* **value** *VALUE_SIZE* **entries** *MAX_ENTRIES* **name** *NAME* [**flags** *FLAGS*] [**dev** *NAME*]
Create a new map with given parameters and pin it to *bpffs*
as *FILE*.
**bpftool map dump** *MAP*
Dump all entries in a given *MAP*.

4
tools/bpf/bpftool/Documentation/bpftool.rst
View File

@ -22,8 +22,8 @@ SYNOPSIS
| { **-j** | **--json** } [{ **-p** | **--pretty** }] }
*MAP-COMMANDS* :=
{ **show** | **list** | **dump** | **update** | **lookup** | **getnext** | **delete**
| **pin** | **event_pipe** | **help** }
{ **show** | **list** | **create** | **dump** | **update** | **lookup** | **getnext**
| **delete** | **pin** | **event_pipe** | **help** }
*PROG-COMMANDS* := { **show** | **list** | **dump jited** | **dump xlated** | **pin**
| **load** | **attach** | **detach** | **help** }

38
tools/bpf/bpftool/bash-completion/bpftool
View File

@ -387,6 +387,42 @@ _bpftool()
;;
esac
;;
create)
case $prev in
$command)
_filedir
return 0
;;
type)
COMPREPLY=( $( compgen -W 'hash array prog_array \
perf_event_array percpu_hash percpu_array \
stack_trace cgroup_array lru_hash \
lru_percpu_hash lpm_trie array_of_maps \
hash_of_maps devmap sockmap cpumap xskmap \
sockhash cgroup_storage reuseport_sockarray \
percpu_cgroup_storage' -- \
"$cur" ) )
return 0
;;
key|value|flags|name|entries)
return 0
;;
dev)
_sysfs_get_netdevs
return 0
;;
*)
_bpftool_once_attr 'type'
_bpftool_once_attr 'key'
_bpftool_once_attr 'value'
_bpftool_once_attr 'entries'
_bpftool_once_attr 'name'
_bpftool_once_attr 'flags'
_bpftool_once_attr 'dev'
return 0
;;
esac
;;
lookup|getnext|delete)
case $prev in
$command)
@ -500,7 +536,7 @@ _bpftool()
*)
[[ $prev == $object ]] && \
COMPREPLY=( $( compgen -W 'delete dump getnext help \
lookup pin event_pipe show list update' -- \
lookup pin event_pipe show list update create' -- \
"$cur" ) )
;;
esac

21
tools/bpf/bpftool/common.c
View File

@ -618,3 +618,24 @@ void print_dev_json(__u32 ifindex, __u64 ns_dev, __u64 ns_inode)
jsonw_string_field(json_wtr, "ifname", name);
jsonw_end_object(json_wtr);
}
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what)
{
char *endptr;
NEXT_ARGP();
if (*val) {
p_err("%s already specified", what);
return -1;
}
*val = strtoul(**argv, &endptr, 0);
if (*endptr) {
p_err("can't parse %s as %s", **argv, what);
return -1;
}
NEXT_ARGP();
return 0;
}

1
tools/bpf/bpftool/main.h
View File

@ -139,6 +139,7 @@ int do_cgroup(int argc, char **arg);
int do_perf(int argc, char **arg);
int do_net(int argc, char **arg);
int parse_u32_arg(int *argc, char ***argv, __u32 *val, const char *what);
int prog_parse_fd(int *argc, char ***argv);
int map_parse_fd(int *argc, char ***argv);
int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len);

110
tools/bpf/bpftool/map.c
View File

@ -36,6 +36,7 @@
#include <fcntl.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <net/if.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
@ -94,6 +95,17 @@ static bool map_is_map_of_progs(__u32 type)
return type == BPF_MAP_TYPE_PROG_ARRAY;
}
static int map_type_from_str(const char *type)
{
unsigned int i;
for (i = 0; i < ARRAY_SIZE(map_type_name); i++)
/* Don't allow prefixing in case of possible future shadowing */
if (map_type_name[i] && !strcmp(map_type_name[i], type))
return i;
return -1;
}
static void *alloc_value(struct bpf_map_info *info)
{
if (map_is_per_cpu(info->type))
@ -1058,6 +1070,92 @@ static int do_pin(int argc, char **argv)
return err;
}
static int do_create(int argc, char **argv)
{
struct bpf_create_map_attr attr = { NULL, };
const char *pinfile;
int err, fd;
if (!REQ_ARGS(7))
return -1;
pinfile = GET_ARG();
while (argc) {
if (!REQ_ARGS(2))
return -1;
if (is_prefix(*argv, "type")) {
NEXT_ARG();
if (attr.map_type) {
p_err("map type already specified");
return -1;
}
attr.map_type = map_type_from_str(*argv);
if ((int)attr.map_type < 0) {
p_err("unrecognized map type: %s", *argv);
return -1;
}
NEXT_ARG();
} else if (is_prefix(*argv, "name")) {
NEXT_ARG();
attr.name = GET_ARG();
} else if (is_prefix(*argv, "key")) {
if (parse_u32_arg(&argc, &argv, &attr.key_size,
"key size"))
return -1;
} else if (is_prefix(*argv, "value")) {
if (parse_u32_arg(&argc, &argv, &attr.value_size,
"value size"))
return -1;
} else if (is_prefix(*argv, "entries")) {
if (parse_u32_arg(&argc, &argv, &attr.max_entries,
"max entries"))
return -1;
} else if (is_prefix(*argv, "flags")) {
if (parse_u32_arg(&argc, &argv, &attr.map_flags,
"flags"))
return -1;
} else if (is_prefix(*argv, "dev")) {
NEXT_ARG();
if (attr.map_ifindex) {
p_err("offload device already specified");
return -1;
}
attr.map_ifindex = if_nametoindex(*argv);
if (!attr.map_ifindex) {
p_err("unrecognized netdevice '%s': %s",
*argv, strerror(errno));
return -1;
}
NEXT_ARG();
}
}
if (!attr.name) {
p_err("map name not specified");
return -1;
}
fd = bpf_create_map_xattr(&attr);
if (fd < 0) {
p_err("map create failed: %s", strerror(errno));
return -1;
}
err = do_pin_fd(fd, pinfile);
close(fd);
if (err)
return err;
if (json_output)
jsonw_null(json_wtr);
return 0;
}
static int do_help(int argc, char **argv)
{
if (json_output) {
@ -1067,6 +1165,9 @@ static int do_help(int argc, char **argv)
fprintf(stderr,
"Usage: %s %s { show | list } [MAP]\n"
" %s %s create FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n"
" entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
" [dev NAME]\n"
" %s %s dump MAP\n"
" %s %s update MAP key DATA value VALUE [UPDATE_FLAGS]\n"
" %s %s lookup MAP key DATA\n"
@ -1081,11 +1182,17 @@ static int do_help(int argc, char **argv)
" " HELP_SPEC_PROGRAM "\n"
" VALUE := { DATA | MAP | PROG }\n"
" UPDATE_FLAGS := { any | exist | noexist }\n"
" TYPE := { hash | array | prog_array | perf_event_array | percpu_hash |\n"
" percpu_array | stack_trace | cgroup_array | lru_hash |\n"
" lru_percpu_hash | lpm_trie | array_of_maps | hash_of_maps |\n"
" devmap | sockmap | cpumap | xskmap | sockhash |\n"
" cgroup_storage | reuseport_sockarray | percpu_cgroup_storage }\n"
" " HELP_SPEC_OPTIONS "\n"
"",
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],
bin_name, argv[-2]);
return 0;
}
@ -1101,6 +1208,7 @@ static const struct cmd cmds[] = {
{ "delete", do_delete },
{ "pin", do_pin },
{ "event_pipe", do_event_pipe },
{ "create", do_create },
{ 0 }
};