tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c
Extension
.c
Size
8884 bytes
Lines
276
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <arpa/inet.h>
#include <uapi/linux/bpf.h>
#include <linux/if_link.h>
#include <network_helpers.h>
#include <net/if.h>
#include <test_progs.h>

#include "test_xdp_devmap_helpers.skel.h"
#include "test_xdp_devmap_tailcall.skel.h"
#include "test_xdp_with_devmap_frags_helpers.skel.h"
#include "test_xdp_with_devmap_helpers.skel.h"

#define IFINDEX_LO 1
#define TEST_NS "devmap_attach_ns"

static void test_xdp_with_devmap_helpers(void)
{
	struct test_xdp_with_devmap_helpers *skel = NULL;
	struct bpf_prog_info info = {};
	struct bpf_devmap_val val = {
		.ifindex = IFINDEX_LO,
	};
	__u32 len = sizeof(info);
	int err, dm_fd, dm_fd_redir, map_fd;
	struct nstoken *nstoken = NULL;
	char data[ETH_HLEN] = {};
	__u32 idx = 0;

	SYS(out_close, "ip netns add %s", TEST_NS);
	nstoken = open_netns(TEST_NS);
	if (!ASSERT_OK_PTR(nstoken, "open_netns"))
		goto out_close;
	SYS(out_close, "ip link set dev lo up");

	skel = test_xdp_with_devmap_helpers__open_and_load();
	if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load"))
		goto out_close;

	dm_fd_redir = bpf_program__fd(skel->progs.xdp_redir_prog);
	err = bpf_xdp_attach(IFINDEX_LO, dm_fd_redir, XDP_FLAGS_SKB_MODE, NULL);
	if (!ASSERT_OK(err, "Generic attach of program with 8-byte devmap"))
		goto out_close;

	dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm);
	map_fd = bpf_map__fd(skel->maps.dm_ports);
	err = bpf_prog_get_info_by_fd(dm_fd, &info, &len);
	if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
		goto out_close;

	val.bpf_prog.fd = dm_fd;
	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
	ASSERT_OK(err, "Add program to devmap entry");

	err = bpf_map_lookup_elem(map_fd, &idx, &val);
	ASSERT_OK(err, "Read devmap entry");
	ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id");

	/* send a packet to trigger any potential bugs in there */
	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
			    .data_in = &data,
			    .data_size_in = sizeof(data),
			    .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
			    .repeat = 1,
		);
	err = bpf_prog_test_run_opts(dm_fd_redir, &opts);
	ASSERT_OK(err, "XDP test run");

	/* wait for the packets to be flushed */
	kern_sync_rcu();

	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
	ASSERT_OK(err, "XDP program detach");

	/* can not attach BPF_XDP_DEVMAP program to a device */
	err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL);
	if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_DEVMAP program"))
		bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);

	val.ifindex = 1;
	val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
	ASSERT_NEQ(err, 0, "Add non-BPF_XDP_DEVMAP program to devmap entry");

	/* Try to attach BPF_XDP program with frags to devmap when we have
	 * already loaded a BPF_XDP program on the map
	 */
	idx = 1;
	val.ifindex = 1;
	val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_dm_frags);

Annotation

Implementation Notes