1// SPDX-License-Identifier: GPL-2.0
  2#include <uapi/linux/bpf.h>
  3#include <linux/if_link.h>
  4#include <test_progs.h>
  5#include <network_helpers.h>
  6
  7#include "test_xdp_with_cpumap_frags_helpers.skel.h"
  8#include "test_xdp_with_cpumap_helpers.skel.h"
  9
 10#define IFINDEX_LO	1
 11#define TEST_NS "cpu_attach_ns"
 12
 13static void test_xdp_with_cpumap_helpers(void)
 14{
 15	struct test_xdp_with_cpumap_helpers *skel = NULL;
 16	struct bpf_prog_info info = {};
 17	__u32 len = sizeof(info);
 18	struct bpf_cpumap_val val = {
 19		.qsize = 192,
 20	};
 21	int err, prog_fd, prog_redir_fd, map_fd;
 22	struct nstoken *nstoken = NULL;
 23	__u32 idx = 0;
 24
 25	SYS(out_close, "ip netns add %s", TEST_NS);
 26	nstoken = open_netns(TEST_NS);
 27	if (!ASSERT_OK_PTR(nstoken, "open_netns"))
 28		goto out_close;
 29	SYS(out_close, "ip link set dev lo up");
 30
 31	skel = test_xdp_with_cpumap_helpers__open_and_load();
 32	if (!ASSERT_OK_PTR(skel, "test_xdp_with_cpumap_helpers__open_and_load"))
 33		return;
 34
 35	prog_redir_fd = bpf_program__fd(skel->progs.xdp_redir_prog);
 36	err = bpf_xdp_attach(IFINDEX_LO, prog_redir_fd, XDP_FLAGS_SKB_MODE, NULL);
 37	if (!ASSERT_OK(err, "Generic attach of program with 8-byte CPUMAP"))
 38		goto out_close;
 39
 40	prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm);
 41	map_fd = bpf_map__fd(skel->maps.cpu_map);
 42	err = bpf_prog_get_info_by_fd(prog_fd, &info, &len);
 43	if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
 44		goto out_close;
 45
 46	val.bpf_prog.fd = prog_fd;
 47	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
 48	ASSERT_OK(err, "Add program to cpumap entry");
 49
 50	err = bpf_map_lookup_elem(map_fd, &idx, &val);
 51	ASSERT_OK(err, "Read cpumap entry");
 52	ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to cpumap entry prog_id");
 53
 54	/* send a packet to trigger any potential bugs in there */
 55	char data[10] = {};
 56	DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
 57			    .data_in = &data,
 58			    .data_size_in = 10,
 59			    .flags = BPF_F_TEST_XDP_LIVE_FRAMES,
 60			    .repeat = 1,
 61		);
 62	err = bpf_prog_test_run_opts(prog_redir_fd, &opts);
 63	ASSERT_OK(err, "XDP test run");
 64
 65	/* wait for the packets to be flushed, then check that redirect has been
 66	 * performed
 67	 */
 68	kern_sync_rcu();
 69	ASSERT_NEQ(skel->bss->redirect_count, 0, "redirected packets");
 70
 71	err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
 72	ASSERT_OK(err, "XDP program detach");
 73
 74	/* can not attach BPF_XDP_CPUMAP program to a device */
 75	err = bpf_xdp_attach(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE, NULL);
 76	if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_CPUMAP program"))
 77		bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL);
 78
 79	val.qsize = 192;
 80	val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);
 81	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
 82	ASSERT_NEQ(err, 0, "Add non-BPF_XDP_CPUMAP program to cpumap entry");
 83
 84	/* Try to attach BPF_XDP program with frags to cpumap when we have
 85	 * already loaded a BPF_XDP program on the map
 86	 */
 87	idx = 1;
 88	val.qsize = 192;
 89	val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_cm_frags);
 90	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
 91	ASSERT_NEQ(err, 0, "Add BPF_XDP program with frags to cpumap entry");
 92
 93out_close:
 94	close_netns(nstoken);
 95	SYS_NOFAIL("ip netns del %s", TEST_NS);
 96	test_xdp_with_cpumap_helpers__destroy(skel);
 97}
 98
 99static void test_xdp_with_cpumap_frags_helpers(void)
100{
101	struct test_xdp_with_cpumap_frags_helpers *skel;
102	struct bpf_prog_info info = {};
103	__u32 len = sizeof(info);
104	struct bpf_cpumap_val val = {
105		.qsize = 192,
106	};
107	int err, frags_prog_fd, map_fd;
108	__u32 idx = 0;
109
110	skel = test_xdp_with_cpumap_frags_helpers__open_and_load();
111	if (!ASSERT_OK_PTR(skel, "test_xdp_with_cpumap_helpers__open_and_load"))
112		return;
113
114	frags_prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm_frags);
115	map_fd = bpf_map__fd(skel->maps.cpu_map);
116	err = bpf_prog_get_info_by_fd(frags_prog_fd, &info, &len);
117	if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd"))
118		goto out_close;
119
120	val.bpf_prog.fd = frags_prog_fd;
121	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
122	ASSERT_OK(err, "Add program to cpumap entry");
123
124	err = bpf_map_lookup_elem(map_fd, &idx, &val);
125	ASSERT_OK(err, "Read cpumap entry");
126	ASSERT_EQ(info.id, val.bpf_prog.id,
127		  "Match program id to cpumap entry prog_id");
128
129	/* Try to attach BPF_XDP program to cpumap when we have
130	 * already loaded a BPF_XDP program with frags on the map
131	 */
132	idx = 1;
133	val.qsize = 192;
134	val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_cm);
135	err = bpf_map_update_elem(map_fd, &idx, &val, 0);
136	ASSERT_NEQ(err, 0, "Add BPF_XDP program to cpumap entry");
137
138out_close:
139	test_xdp_with_cpumap_frags_helpers__destroy(skel);
140}
141
142void test_xdp_cpumap_attach(void)
143{
144	if (test__start_subtest("CPUMAP with programs in entries"))
145		test_xdp_with_cpumap_helpers();
146
147	if (test__start_subtest("CPUMAP with frags programs in entries"))
148		test_xdp_with_cpumap_frags_helpers();
149}