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Date: Wed, 13 Apr 2022 22:33:12 +0800
From: Hou Tao <houtao1@...wei.com>
To: <cgel.zte@...il.com>, <shuah@...nel.org>, <ast@...nel.org>,
<daniel@...earbox.net>
CC: <andrii@...nel.org>, <kafai@...com>, <songliubraving@...com>,
<yhs@...com>, <john.fastabend@...il.com>, <kpsingh@...nel.org>,
<joannekoong@...com>, <lv.ruyi@....com.cn>, <toke@...hat.com>,
<linux-kselftest@...r.kernel.org>, <netdev@...r.kernel.org>,
<bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] bpf/benchs: fix error check return value of
bpf_program__attach()
Hi,
On 4/13/2022 5:31 PM, cgel.zte@...il.com wrote:
> From: Lv Ruyi <lv.ruyi@....com.cn>
>
> bpf_program__attach() returns error ptr when it fails, so we should use
> IS_ERR() to check it in error handling path. The patch fix all the same
> problems in the bpf/benchs/*.
The fix is unnecessary. Because libbpf has been setup as LIBBPF_STRICT_ALL mode
in setup_libbpf() of bench.c, so when bpf_program__attach() fails, it will
return NULL instead of ERR_PTR(err).
>
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
> ---
> .../selftests/bpf/benchs/bench_bloom_filter_map.c | 10 +++++-----
> tools/testing/selftests/bpf/benchs/bench_bpf_loop.c | 2 +-
> tools/testing/selftests/bpf/benchs/bench_rename.c | 2 +-
> tools/testing/selftests/bpf/benchs/bench_ringbufs.c | 6 +++---
> tools/testing/selftests/bpf/benchs/bench_strncmp.c | 2 +-
> tools/testing/selftests/bpf/benchs/bench_trigger.c | 2 +-
> 6 files changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c b/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
> index 5bcb8a8cdeb2..fd1be1042516 100644
> --- a/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
> +++ b/tools/testing/selftests/bpf/benchs/bench_bloom_filter_map.c
> @@ -309,7 +309,7 @@ static void bloom_lookup_setup(void)
> populate_maps();
>
> link = bpf_program__attach(ctx.skel->progs.bloom_lookup);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> @@ -326,7 +326,7 @@ static void bloom_update_setup(void)
> populate_maps();
>
> link = bpf_program__attach(ctx.skel->progs.bloom_update);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> @@ -345,7 +345,7 @@ static void false_positive_setup(void)
> populate_maps();
>
> link = bpf_program__attach(ctx.skel->progs.bloom_hashmap_lookup);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> @@ -363,7 +363,7 @@ static void hashmap_with_bloom_setup(void)
> populate_maps();
>
> link = bpf_program__attach(ctx.skel->progs.bloom_hashmap_lookup);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> @@ -380,7 +380,7 @@ static void hashmap_no_bloom_setup(void)
> populate_maps();
>
> link = bpf_program__attach(ctx.skel->progs.bloom_hashmap_lookup);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> diff --git a/tools/testing/selftests/bpf/benchs/bench_bpf_loop.c b/tools/testing/selftests/bpf/benchs/bench_bpf_loop.c
> index d0a6572bfab6..8dbdc28d26c8 100644
> --- a/tools/testing/selftests/bpf/benchs/bench_bpf_loop.c
> +++ b/tools/testing/selftests/bpf/benchs/bench_bpf_loop.c
> @@ -85,7 +85,7 @@ static void setup(void)
> }
>
> link = bpf_program__attach(ctx.skel->progs.benchmark);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> diff --git a/tools/testing/selftests/bpf/benchs/bench_rename.c b/tools/testing/selftests/bpf/benchs/bench_rename.c
> index 3c203b6d6a6e..66d63b92a28a 100644
> --- a/tools/testing/selftests/bpf/benchs/bench_rename.c
> +++ b/tools/testing/selftests/bpf/benchs/bench_rename.c
> @@ -65,7 +65,7 @@ static void attach_bpf(struct bpf_program *prog)
> struct bpf_link *link;
>
> link = bpf_program__attach(prog);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> diff --git a/tools/testing/selftests/bpf/benchs/bench_ringbufs.c b/tools/testing/selftests/bpf/benchs/bench_ringbufs.c
> index c2554f9695ff..fff24ca82dc0 100644
> --- a/tools/testing/selftests/bpf/benchs/bench_ringbufs.c
> +++ b/tools/testing/selftests/bpf/benchs/bench_ringbufs.c
> @@ -181,7 +181,7 @@ static void ringbuf_libbpf_setup(void)
> }
>
> link = bpf_program__attach(ctx->skel->progs.bench_ringbuf);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> @@ -271,7 +271,7 @@ static void ringbuf_custom_setup(void)
> }
>
> link = bpf_program__attach(ctx->skel->progs.bench_ringbuf);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program\n");
> exit(1);
> }
> @@ -426,7 +426,7 @@ static void perfbuf_libbpf_setup(void)
> }
>
> link = bpf_program__attach(ctx->skel->progs.bench_perfbuf);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program\n");
> exit(1);
> }
> diff --git a/tools/testing/selftests/bpf/benchs/bench_strncmp.c b/tools/testing/selftests/bpf/benchs/bench_strncmp.c
> index 494b591c0289..dcb9ce5ffcb0 100644
> --- a/tools/testing/selftests/bpf/benchs/bench_strncmp.c
> +++ b/tools/testing/selftests/bpf/benchs/bench_strncmp.c
> @@ -103,7 +103,7 @@ static void strncmp_attach_prog(struct bpf_program *prog)
> struct bpf_link *link;
>
> link = bpf_program__attach(prog);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
> diff --git a/tools/testing/selftests/bpf/benchs/bench_trigger.c b/tools/testing/selftests/bpf/benchs/bench_trigger.c
> index 0c481de2833d..bda930a8153c 100644
> --- a/tools/testing/selftests/bpf/benchs/bench_trigger.c
> +++ b/tools/testing/selftests/bpf/benchs/bench_trigger.c
> @@ -61,7 +61,7 @@ static void attach_bpf(struct bpf_program *prog)
> struct bpf_link *link;
>
> link = bpf_program__attach(prog);
> - if (!link) {
> + if (IS_ERR(link)) {
> fprintf(stderr, "failed to attach program!\n");
> exit(1);
> }
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