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selftests/bpf: Test FIONREAD on a sockmap socket without a verdict program

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Add a test validating that FIONREAD on a TCP socket in a sockmap
without a verdict program reports data pending in sk_receive_queue.

Signed-off-by: Mattia Meleleo <mattia.meleleo@coralogix.com>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Reviewed-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20260708-fionread-no-verdict-v3-2-b4ee31b3af53@coralogix.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
This commit is contained in:
Mattia Meleleo
2026-07-08 18:55:01 +02:00
committed by Kumar Kartikeya Dwivedi
parent 04af4efde5
commit a42f05cc4c
1 changed files with 39 additions and 0 deletions
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39
tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
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@@ -1373,6 +1373,43 @@ static void test_sockmap_multi_channels(int sotype)
test_sockmap_pass_prog__destroy(skel);
}
/* A socket in a sockmap without a verdict program keeps its ingress data
* in sk_receive_queue: FIONREAD must account for it.
*/
static void test_sockmap_no_verdict_fionread(void)
{
int err, map, zero = 0, sent, avail;
int c0 = -1, c1 = -1, p0 = -1, p1 = -1;
struct test_sockmap_pass_prog *skel;
char buf[256] = "0123456789";
skel = test_sockmap_pass_prog__open_and_load();
if (!ASSERT_OK_PTR(skel, "open_and_load"))
return;
map = bpf_map__fd(skel->maps.sock_map_rx);
err = create_socket_pairs(AF_INET, SOCK_STREAM, &c0, &c1, &p0, &p1);
if (!ASSERT_OK(err, "create_socket_pairs()"))
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(p1)");
avail = wait_for_fionread(c1, sizeof(buf), IO_TIMEOUT_SEC);
ASSERT_EQ(avail, sizeof(buf), "ioctl(FIONREAD)");
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"))
@@ -1415,6 +1452,8 @@ void test_sockmap_basic(void)
test_sockmap_skb_verdict_shutdown();
if (test__start_subtest("sockmap skb_verdict fionread"))
test_sockmap_skb_verdict_fionread(true);
if (test__start_subtest("sockmap no_verdict fionread"))
test_sockmap_no_verdict_fionread();
if (test__start_subtest("sockmap skb_verdict fionread on drop"))
test_sockmap_skb_verdict_fionread(false);
if (test__start_subtest("sockmap skb_verdict change tail"))