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Date: Mon, 19 Nov 2018 17:37:24 -0800
From: "Nikita V. Shirokov" <tehnerd@...nerd.com>
To: Y Song <ys114321@...il.com>
Cc: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jakub Kicinski <jakub.kicinski@...ronome.com>,
netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next 2/2] bpf: adding tests for mapinmap helpber in
libbpf
O Mon, Nov 19, 2018 at 05:18:46PM -0800, Y Song wrote:
> On Mon, Nov 19, 2018 at 4:13 PM Nikita V. Shirokov <tehnerd@...nerd.com> wrote:
> >
> > adding test/example of bpf_map__add_inner_map_fd usage
> >
> > Signed-off-by: Nikita V. Shirokov <tehnerd@...nerd.com>
> > ---
> > tools/testing/selftests/bpf/Makefile | 3 +-
> > tools/testing/selftests/bpf/test_mapinmap.c | 53 ++++++++++++++++++++
> > tools/testing/selftests/bpf/test_maps.c | 76 +++++++++++++++++++++++++++++
> > 3 files changed, 131 insertions(+), 1 deletion(-)
> > create mode 100644 tools/testing/selftests/bpf/test_mapinmap.c
> >
> > diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> > index 57b4712a6276..a3ea69dc9bdf 100644
> > --- a/tools/testing/selftests/bpf/Makefile
> > +++ b/tools/testing/selftests/bpf/Makefile
> > @@ -38,7 +38,8 @@ TEST_GEN_FILES = test_pkt_access.o test_xdp.o test_l4lb.o test_tcp_estats.o test
> > test_lwt_seg6local.o sendmsg4_prog.o sendmsg6_prog.o test_lirc_mode2_kern.o \
> > get_cgroup_id_kern.o socket_cookie_prog.o test_select_reuseport_kern.o \
> > test_skb_cgroup_id_kern.o bpf_flow.o netcnt_prog.o \
> > - test_sk_lookup_kern.o test_xdp_vlan.o test_queue_map.o test_stack_map.o
> > + test_sk_lookup_kern.o test_xdp_vlan.o test_queue_map.o test_stack_map.o \
> > + test_mapinmap.o
> >
> > # Order correspond to 'make run_tests' order
> > TEST_PROGS := test_kmod.sh \
> > diff --git a/tools/testing/selftests/bpf/test_mapinmap.c b/tools/testing/selftests/bpf/test_mapinmap.c
> > new file mode 100644
> > index 000000000000..8aef6c652c9c
> > --- /dev/null
> > +++ b/tools/testing/selftests/bpf/test_mapinmap.c
> > @@ -0,0 +1,53 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/* Copyright (c) 2018 Facebook */
> > +#include <stddef.h>
> > +#include <linux/bpf.h>
> > +#include <linux/types.h>
> > +#include "bpf_helpers.h"
> > +
> > +
> nit: extra new line
>
> > +struct bpf_map_def SEC("maps") mim_array = {
> > + .type = BPF_MAP_TYPE_ARRAY_OF_MAPS,
> > + .key_size = sizeof(int),
> > + /* must be sizeof(__u32) for map in map */
> > + .value_size = sizeof(__u32),
> > + .max_entries = 1,
> > + .map_flags = 0,
> > +};
> > +
> > +struct bpf_map_def SEC("maps") mim_hash = {
> > + .type = BPF_MAP_TYPE_HASH_OF_MAPS,
> > + .key_size = sizeof(int),
> > + /* must be sizeof(__u32) for map in map */
> > + .value_size = sizeof(__u32),
> > + .max_entries = 1,
> > + .map_flags = 0,
> > +};
> > +
> > +
> > +
> nit: extra new lines.
> > +SEC("xdp_mimtest")
> > +int xdp_mimtest0(struct xdp_md *ctx)
> > +{
> > + int value = 123;
> > + int key = 0;
> > + void *map;
> > +
> > + map = bpf_map_lookup_elem(&mim_array, &key);
> > + if (!map)
> > + return XDP_DROP;
> > +
> > + bpf_map_update_elem(map, &key, &value, 0);
> > +
> > + map = bpf_map_lookup_elem(&mim_hash, &key);
> > + if (!map)
> > + return XDP_DROP;
> > +
> > + bpf_map_update_elem(map, &key, &value, 0);
> > +
> > + return XDP_PASS;
> > +}
> > +
> > +
> nit: extra new line
> > +int _version SEC("version") = 1;
> > +char _license[] SEC("license") = "GPL";
> > diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
> > index 4db2116e52be..a49ab294971d 100644
> > --- a/tools/testing/selftests/bpf/test_maps.c
> > +++ b/tools/testing/selftests/bpf/test_maps.c
> > @@ -1080,6 +1080,80 @@ static void test_sockmap(int tasks, void *data)
> > exit(1);
> > }
> >
> > +#define MAPINMAP_PROG "./test_mapinmap.o"
> > +static void test_mapinmap(void)
> > +{
> > + struct bpf_program *prog;
> > + struct bpf_object *obj;
> > + struct bpf_map *map;
> > + int mim_fd, fd;
> > + int pos = 0;
> > +
> > + obj = bpf_object__open(MAPINMAP_PROG);
> > +
> > + fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(int), sizeof(int),
> > + 2, 0);
> > + if (fd < 0) {
> > + printf("Failed to create hashmap '%s'!\n", strerror(errno));
> > + exit(1);
> > + }
> > + printf("fd is %d\n", fd);
> not sure whether you need to print fd in the console or not. Any particular
> reason?
was using for debugging. forget to remove.
> > +
> > + map = bpf_object__find_map_by_name(obj, "mim_array");
> > + if (IS_ERR(map)) {
> > + printf("Failed to load array of maps from test prog\n");
> > + goto out_mapinmap;
> > + }
> > + bpf_map__add_inner_map_fd(map, fd);
> > +
> > + map = bpf_object__find_map_by_name(obj, "mim_hash");
> > + if (IS_ERR(map)) {
> > + printf("Failed to load hash of maps from test prog\n");
> > + goto out_mapinmap;
> > + }
> > + bpf_map__add_inner_map_fd(map, fd);
> > +
> > +
> nit: extra new line
> > + bpf_object__for_each_program(prog, obj) {
> > + bpf_program__set_xdp(prog);
> > + }
> > + bpf_object__load(obj);
> > +
> > + map = bpf_object__find_map_by_name(obj, "mim_array");
> > + if (IS_ERR(map)) {
> > + printf("Failed to load array of maps from test prog\n");
> > + goto out_mapinmap;
> > + }
> > + mim_fd = bpf_map__fd(map);
> > + if (mim_fd < 0) {
> > + printf("Failed to get descriptor for array of maps\n");
> > + goto out_mapinmap;
> > + }
> > +
> > + bpf_map_update_elem(mim_fd, &pos, &fd, 0);
> do you want to test return value of bpf_map_update_elem() to make sure
> update is successful?
sure.
> > +
> > + map = bpf_object__find_map_by_name(obj, "mim_hash");
> > + if (IS_ERR(map)) {
> > + printf("Failed to load hash of maps from test prog\n");
> > + goto out_mapinmap;
> > + }
> > + mim_fd = bpf_map__fd(map);
> > + if (mim_fd < 0) {
> > + printf("Failed to get descriptor for hash of maps\n");
> > + goto out_mapinmap;
> > + }
> > + bpf_map_update_elem(mim_fd, &pos, &fd, 0);
> do you want to test return value of bpf_map_update_elem()?
> > +
> > +
> nit: extra new line
> > + close(fd);
> > + bpf_object__close(obj);
> > + return;
> > +
> > +out_mapinmap:
> > + close(fd);
> > + exit(1);
> > +}
> > +
> > #define MAP_SIZE (32 * 1024)
> >
> > static void test_map_large(void)
> > @@ -1554,6 +1628,8 @@ static void run_all_tests(void)
> >
> > test_queuemap(0, NULL);
> > test_stackmap(0, NULL);
> > +
> > + test_mapinmap();
> > }
> >
> > int main(void)
> > --
> > 2.15.1
> >
--
Nikita
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