Commit 05500125 authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Daniel Borkmann
Browse files

selftest: Add tests for XDP programs in CPUMAP entries 



Similar to what have been done for DEVMAP, introduce tests to verify
ability to add a XDP program to an entry in a CPUMAP.
Verify CPUMAP programs can not be attached to devices as a normal
XDP program, and only programs with BPF_XDP_CPUMAP attach type can
be loaded in a CPUMAP.

Signed-off-by: default avatarLorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/9c632fcea5382ea7b4578bd06b6eddf382c3550b.1594734381.git.lorenzo@kernel.org
parent ce4dade7

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

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// SPDX-License-Identifier: GPL-2.0

#include <uapi/linux/bpf.h>

#include <linux/if_link.h>

#include <test_progs.h>



#include "test_xdp_with_cpumap_helpers.skel.h"



#define IFINDEX_LO	1



void test_xdp_with_cpumap_helpers(void)

{

	struct test_xdp_with_cpumap_helpers *skel;

	struct bpf_prog_info info = {};

	struct bpf_cpumap_val val = {

		.qsize = 192,

	};

	__u32 duration = 0, idx = 0;

	__u32 len = sizeof(info);

	int err, prog_fd, map_fd;



	skel = test_xdp_with_cpumap_helpers__open_and_load();

	if (CHECK_FAIL(!skel)) {

		perror("test_xdp_with_cpumap_helpers__open_and_load");

		return;

	}



	/* can not attach program with cpumaps that allow programs

	 * as xdp generic

	 */

	prog_fd = bpf_program__fd(skel->progs.xdp_redir_prog);

	err = bpf_set_link_xdp_fd(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE);

	CHECK(err == 0, "Generic attach of program with 8-byte CPUMAP",

	      "should have failed\n");



	prog_fd = bpf_program__fd(skel->progs.xdp_dummy_cm);

	map_fd = bpf_map__fd(skel->maps.cpu_map);

	err = bpf_obj_get_info_by_fd(prog_fd, &info, &len);

	if (CHECK_FAIL(err))

		goto out_close;



	val.bpf_prog.fd = prog_fd;

	err = bpf_map_update_elem(map_fd, &idx, &val, 0);

	CHECK(err, "Add program to cpumap entry", "err %d errno %d\n",

	      err, errno);



	err = bpf_map_lookup_elem(map_fd, &idx, &val);

	CHECK(err, "Read cpumap entry", "err %d errno %d\n", err, errno);

	CHECK(info.id != val.bpf_prog.id, "Expected program id in cpumap entry",

	      "expected %u read %u\n", info.id, val.bpf_prog.id);



	/* can not attach BPF_XDP_CPUMAP program to a device */

	err = bpf_set_link_xdp_fd(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE);

	CHECK(err == 0, "Attach of BPF_XDP_CPUMAP program",

	      "should have failed\n");



	val.qsize = 192;

	val.bpf_prog.fd = bpf_program__fd(skel->progs.xdp_dummy_prog);

	err = bpf_map_update_elem(map_fd, &idx, &val, 0);

	CHECK(err == 0, "Add non-BPF_XDP_CPUMAP program to cpumap entry",

	      "should have failed\n");



out_close:

	test_xdp_with_cpumap_helpers__destroy(skel);

}



void test_xdp_cpumap_attach(void)

{

	if (test__start_subtest("cpumap_with_progs"))

		test_xdp_with_cpumap_helpers();

}

tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c

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// SPDX-License-Identifier: GPL-2.0



#include <linux/bpf.h>

#include <bpf/bpf_helpers.h>



#define IFINDEX_LO	1



struct {

	__uint(type, BPF_MAP_TYPE_CPUMAP);

	__uint(key_size, sizeof(__u32));

	__uint(value_size, sizeof(struct bpf_cpumap_val));

	__uint(max_entries, 4);

} cpu_map SEC(".maps");



SEC("xdp_redir")

int xdp_redir_prog(struct xdp_md *ctx)

{

	return bpf_redirect_map(&cpu_map, 1, 0);

}



SEC("xdp_dummy")

int xdp_dummy_prog(struct xdp_md *ctx)

{

	return XDP_PASS;

}



SEC("xdp_cpumap/dummy_cm")

int xdp_dummy_cm(struct xdp_md *ctx)

{

	if (ctx->ingress_ifindex == IFINDEX_LO)

		return XDP_DROP;



	return XDP_PASS;

}



char _license[] SEC("license") = "GPL";