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selftests/bpf: check program redirect in xdp_cpumap_attach

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xdp_cpumap_attach, in its current form, only checks that an xdp cpumap
program can be executed, but not that it performs correctly the cpu
redirect as configured by userspace (bpf_prog_test_run_opts will return
success even if the redirect program returns an error)

Add a check to ensure that the program performs the configured redirect
as well. The check is based on a global variable incremented by a
chained program executed only if the redirect program properly executes.

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Link: https://lore.kernel.org/r/20241009-convert_xdp_tests-v3-3-51cea913710c@bootlin.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Alexis Lothoré (eBPF Foundation)
2024-10-09 12:12:09 +02:00
committed by Martin KaFai Lau
parent d5fbcf46ee
commit d124d984c8
2 changed files with 9 additions and 1 deletions
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5
tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c
View File

@@ -62,8 +62,11 @@ static void test_xdp_with_cpumap_helpers(void)
err = bpf_prog_test_run_opts(prog_redir_fd, &opts);
ASSERT_OK(err, "XDP test run");
/* wait for the packets to be flushed */
/* wait for the packets to be flushed, then check that redirect has been
* performed
*/
kern_sync_rcu();
ASSERT_NEQ(skel->bss->redirect_count, 0, "redirected packets");
err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
ASSERT_OK(err, "XDP program detach");

5
tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c
View File

@@ -12,6 +12,8 @@ struct {
__uint(max_entries, 4);
} cpu_map SEC(".maps");
__u32 redirect_count = 0;
SEC("xdp")
int xdp_redir_prog(struct xdp_md *ctx)
{
@@ -27,6 +29,9 @@ int xdp_dummy_prog(struct xdp_md *ctx)
SEC("xdp/cpumap")
int xdp_dummy_cm(struct xdp_md *ctx)
{
if (bpf_get_smp_processor_id() == 0)
redirect_count++;
if (ctx->ingress_ifindex == IFINDEX_LO)
return XDP_DROP;