* [PATCH v2 bpf-next] selftest/bpf: check invalid length in test_xdp_update_frags
@ 2022-02-09 0:35 Lorenzo Bianconi
2022-02-09 7:20 ` Yonghong Song
2022-02-11 2:00 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Lorenzo Bianconi @ 2022-02-09 0:35 UTC (permalink / raw)
To: bpf; +Cc: ast, daniel, brouer, toke, lorenzo.bianconi, andrii, yhs
Update test_xdp_update_frags adding a test for a buffer size
set to (MAX_SKB_FRAGS + 2) * PAGE_SIZE. The kernel is supposed
to return -ENOMEM.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
Changes since v1:
- updated ASSERT log message
---
.../bpf/prog_tests/xdp_adjust_frags.c | 38 ++++++++++++++++++-
1 file changed, 37 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c
index d18e6f343c48..2f033da4cd45 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_frags.c
@@ -5,11 +5,12 @@
static void test_xdp_update_frags(void)
{
const char *file = "./test_xdp_update_frags.o";
+ int err, prog_fd, max_skb_frags, buf_size, num;
struct bpf_program *prog;
struct bpf_object *obj;
- int err, prog_fd;
__u32 *offset;
__u8 *buf;
+ FILE *f;
LIBBPF_OPTS(bpf_test_run_opts, topts);
obj = bpf_object__open(file);
@@ -99,6 +100,41 @@ static void test_xdp_update_frags(void)
ASSERT_EQ(buf[7621], 0xbb, "xdp_update_frag buf[7621]");
free(buf);
+
+ /* test_xdp_update_frags: unsupported buffer size */
+ f = fopen("/proc/sys/net/core/max_skb_frags", "r");
+ if (!ASSERT_OK_PTR(f, "max_skb_frag file pointer"))
+ goto out;
+
+ num = fscanf(f, "%d", &max_skb_frags);
+ fclose(f);
+
+ if (!ASSERT_EQ(num, 1, "max_skb_frags read failed"))
+ goto out;
+
+ /* xdp_buff linear area size is always set to 4096 in the
+ * bpf_prog_test_run_xdp routine.
+ */
+ buf_size = 4096 + (max_skb_frags + 1) * sysconf(_SC_PAGE_SIZE);
+ buf = malloc(buf_size);
+ if (!ASSERT_OK_PTR(buf, "alloc buf"))
+ goto out;
+
+ memset(buf, 0, buf_size);
+ offset = (__u32 *)buf;
+ *offset = 16;
+ buf[*offset] = 0xaa;
+ buf[*offset + 15] = 0xaa;
+
+ topts.data_in = buf;
+ topts.data_out = buf;
+ topts.data_size_in = buf_size;
+ topts.data_size_out = buf_size;
+
+ err = bpf_prog_test_run_opts(prog_fd, &topts);
+ ASSERT_EQ(err, -ENOMEM,
+ "unsupported buf size, possible non-default /proc/sys/net/core/max_skb_flags?");
+ free(buf);
out:
bpf_object__close(obj);
}
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v2 bpf-next] selftest/bpf: check invalid length in test_xdp_update_frags
2022-02-09 0:35 [PATCH v2 bpf-next] selftest/bpf: check invalid length in test_xdp_update_frags Lorenzo Bianconi
@ 2022-02-09 7:20 ` Yonghong Song
2022-02-11 2:00 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Yonghong Song @ 2022-02-09 7:20 UTC (permalink / raw)
To: Lorenzo Bianconi, bpf; +Cc: ast, daniel, brouer, toke, lorenzo.bianconi, andrii
On 2/8/22 4:35 PM, Lorenzo Bianconi wrote:
> Update test_xdp_update_frags adding a test for a buffer size
> set to (MAX_SKB_FRAGS + 2) * PAGE_SIZE. The kernel is supposed
> to return -ENOMEM.
>
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v2 bpf-next] selftest/bpf: check invalid length in test_xdp_update_frags
2022-02-09 0:35 [PATCH v2 bpf-next] selftest/bpf: check invalid length in test_xdp_update_frags Lorenzo Bianconi
2022-02-09 7:20 ` Yonghong Song
@ 2022-02-11 2:00 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2022-02-11 2:00 UTC (permalink / raw)
To: Lorenzo Bianconi
Cc: bpf, ast, daniel, brouer, toke, lorenzo.bianconi, andrii, yhs
Hello:
This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@kernel.org>:
On Wed, 9 Feb 2022 01:35:12 +0100 you wrote:
> Update test_xdp_update_frags adding a test for a buffer size
> set to (MAX_SKB_FRAGS + 2) * PAGE_SIZE. The kernel is supposed
> to return -ENOMEM.
>
> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
> ---
> Changes since v1:
> - updated ASSERT log message
>
> [...]
Here is the summary with links:
- [v2,bpf-next] selftest/bpf: check invalid length in test_xdp_update_frags
https://git.kernel.org/bpf/bpf-next/c/a5a358abbc39
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2022-02-09 0:35 [PATCH v2 bpf-next] selftest/bpf: check invalid length in test_xdp_update_frags Lorenzo Bianconi
2022-02-09 7:20 ` Yonghong Song
2022-02-11 2:00 ` patchwork-bot+netdevbpf
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