diff mbox series

[bpf,v7,12/13] bpf: sockmap, test FIONREAD returns correct bytes in rx buffer

Message ID 20230502155159.305437-13-john.fastabend@gmail.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf sockmap fixes | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf, async
netdev/apply fail Patch does not apply to bpf
bpf/vmtest-bpf-PR fail merge-conflict
bpf/vmtest-bpf-VM_Test-1 success Logs for ShellCheck
bpf/vmtest-bpf-VM_Test-2 success Logs for build for aarch64 with gcc
bpf/vmtest-bpf-VM_Test-3 success Logs for build for aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-4 success Logs for build for s390x with gcc
bpf/vmtest-bpf-VM_Test-5 success Logs for build for x86_64 with gcc
bpf/vmtest-bpf-VM_Test-6 success Logs for build for x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-7 success Logs for set-matrix
bpf/vmtest-bpf-VM_Test-8 success Logs for test_maps on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-9 success Logs for test_maps on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-10 success Logs for test_maps on s390x with gcc
bpf/vmtest-bpf-VM_Test-11 success Logs for test_maps on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-12 success Logs for test_maps on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-13 fail Logs for test_progs on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-14 fail Logs for test_progs on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-15 fail Logs for test_progs on s390x with gcc
bpf/vmtest-bpf-VM_Test-16 fail Logs for test_progs on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-17 fail Logs for test_progs on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-18 fail Logs for test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-19 fail Logs for test_progs_no_alu32 on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-20 fail Logs for test_progs_no_alu32 on s390x with gcc
bpf/vmtest-bpf-VM_Test-21 fail Logs for test_progs_no_alu32 on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-22 fail Logs for test_progs_no_alu32 on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-23 success Logs for test_progs_no_alu32_parallel on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-24 success Logs for test_progs_no_alu32_parallel on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-25 success Logs for test_progs_no_alu32_parallel on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-26 success Logs for test_progs_no_alu32_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-27 success Logs for test_progs_parallel on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-28 success Logs for test_progs_parallel on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-29 success Logs for test_progs_parallel on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-30 success Logs for test_progs_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-31 success Logs for test_verifier on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-32 success Logs for test_verifier on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-33 success Logs for test_verifier on s390x with gcc
bpf/vmtest-bpf-VM_Test-34 success Logs for test_verifier on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-35 success Logs for test_verifier on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-36 success Logs for veristat

Commit Message

John Fastabend May 2, 2023, 3:51 p.m. UTC 
A bug was reported where ioctl(FIONREAD) returned zero even though the
socket with a SK_SKB verdict program attached had bytes in the msg
queue. The result is programs may hang or more likely try to recover,
but use suboptimal buffer sizes.

Add a test to check that ioctl(FIONREAD) returns the correct number of
bytes.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
---
 .../selftests/bpf/prog_tests/sockmap_basic.c  | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)

Comments

Jakub Sitnicki May 8, 2023, 11:19 a.m. UTC | #1 
On Tue, May 02, 2023 at 08:51 AM -07, John Fastabend wrote:
> A bug was reported where ioctl(FIONREAD) returned zero even though the
> socket with a SK_SKB verdict program attached had bytes in the msg
> queue. The result is programs may hang or more likely try to recover,
> but use suboptimal buffer sizes.
>
> Add a test to check that ioctl(FIONREAD) returns the correct number of
> bytes.
>
> Signed-off-by: John Fastabend <john.fastabend@gmail.com>
> ---

Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
index f9f611618e45..322b5a135740 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
@@ -416,6 +416,52 @@  static void test_sockmap_skb_verdict_shutdown(void)
 	test_sockmap_pass_prog__destroy(skel);
 }
 
+static void test_sockmap_skb_verdict_fionread(void)
+{
+	int err, map, verdict, s, c0, c1, p0, p1;
+	struct test_sockmap_pass_prog *skel;
+	int zero = 0, sent, recvd, avail;
+	char buf[256] = "0123456789";
+
+	skel = test_sockmap_pass_prog__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "open_and_load"))
+		return;
+
+	verdict = bpf_program__fd(skel->progs.prog_skb_verdict);
+	map = bpf_map__fd(skel->maps.sock_map_rx);
+
+	err = bpf_prog_attach(verdict, map, BPF_SK_SKB_STREAM_VERDICT, 0);
+	if (!ASSERT_OK(err, "bpf_prog_attach"))
+		goto out;
+
+	s = socket_loopback(AF_INET, SOCK_STREAM);
+	if (!ASSERT_GT(s, -1, "socket_loopback(s)"))
+		goto out;
+	err = create_socket_pairs(s, AF_INET, SOCK_STREAM, &c0, &c1, &p0, &p1);
+	if (!ASSERT_OK(err, "create_socket_pairs(s)"))
+		goto out;
+
+	err = bpf_map_update_elem(map, &zero, &c1, BPF_NOEXIST);
+	if (!ASSERT_OK(err, "bpf_map_update_elem(c1)"))
+		goto out_close;
+
+	sent = xsend(p1, &buf, sizeof(buf), 0);
+	ASSERT_EQ(sent, sizeof(buf), "xsend(p0)");
+	err = ioctl(c1, FIONREAD, &avail);
+	ASSERT_OK(err, "ioctl(FIONREAD) error");
+	ASSERT_EQ(avail, sizeof(buf), "ioctl(FIONREAD)");
+	recvd = recv_timeout(c1, &buf, sizeof(buf), SOCK_NONBLOCK, IO_TIMEOUT_SEC);
+	ASSERT_EQ(recvd, sizeof(buf), "recv_timeout(c0)");
+
+out_close:
+	close(c0);
+	close(p0);
+	close(c1);
+	close(p1);
+out:
+	test_sockmap_pass_prog__destroy(skel);
+}
+
 void test_sockmap_basic(void)
 {
 	if (test__start_subtest("sockmap create_update_free"))
@@ -452,4 +498,6 @@  void test_sockmap_basic(void)
 		test_sockmap_progs_query(BPF_SK_SKB_VERDICT);
 	if (test__start_subtest("sockmap skb_verdict shutdown"))
 		test_sockmap_skb_verdict_shutdown();
+	if (test__start_subtest("sockmap skb_verdict fionread"))
+		test_sockmap_skb_verdict_fionread();
 }