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selftests/bpf: Add test for bpf_get_link_xdp_id

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Add xdp_info selftest that makes sure that bpf_get_link_xdp_id returns
valid prog_id for different input modes:

  * w/ and w/o flags when no program is attached;
  * w/ and w/o flags when one program is attached.

Signed-off-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/2a9a6d1ce33b91ccc1aa3de6dba2d309f2062811.1586236080.git.rdna@fb.com
This commit is contained in:
Andrey Ignatov 2020-04-06 22:09:46 -07:00 committed by Daniel Borkmann
parent f07cbad297
commit eb203f4b89
1 changed files with 68 additions and 0 deletions
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68
tools/testing/selftests/bpf/prog_tests/xdp_info.c Normal file
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// SPDX-License-Identifier: GPL-2.0
#include <linux/if_link.h>
#include <test_progs.h>
#define IFINDEX_LO 1
void test_xdp_info(void)
{
__u32 len = sizeof(struct bpf_prog_info), duration = 0, prog_id;
const char *file = "./xdp_dummy.o";
struct bpf_prog_info info = {};
struct bpf_object *obj;
int err, prog_fd;
/* Get prog_id for XDP_ATTACHED_NONE mode */
err = bpf_get_link_xdp_id(IFINDEX_LO, &prog_id, 0);
if (CHECK(err, "get_xdp_none", "errno=%d\n", errno))
return;
if (CHECK(prog_id, "prog_id_none", "unexpected prog_id=%u\n", prog_id))
return;
err = bpf_get_link_xdp_id(IFINDEX_LO, &prog_id, XDP_FLAGS_SKB_MODE);
if (CHECK(err, "get_xdp_none_skb", "errno=%d\n", errno))
return;
if (CHECK(prog_id, "prog_id_none_skb", "unexpected prog_id=%u\n",
prog_id))
return;
/* Setup prog */
err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd);
if (CHECK_FAIL(err))
return;
err = bpf_obj_get_info_by_fd(prog_fd, &info, &len);
if (CHECK(err, "get_prog_info", "errno=%d\n", errno))
goto out_close;
err = bpf_set_link_xdp_fd(IFINDEX_LO, prog_fd, XDP_FLAGS_SKB_MODE);
if (CHECK(err, "set_xdp_skb", "errno=%d\n", errno))
goto out_close;
/* Get prog_id for single prog mode */
err = bpf_get_link_xdp_id(IFINDEX_LO, &prog_id, 0);
if (CHECK(err, "get_xdp", "errno=%d\n", errno))
goto out;
if (CHECK(prog_id != info.id, "prog_id", "prog_id not available\n"))
goto out;
err = bpf_get_link_xdp_id(IFINDEX_LO, &prog_id, XDP_FLAGS_SKB_MODE);
if (CHECK(err, "get_xdp_skb", "errno=%d\n", errno))
goto out;
if (CHECK(prog_id != info.id, "prog_id_skb", "prog_id not available\n"))
goto out;
err = bpf_get_link_xdp_id(IFINDEX_LO, &prog_id, XDP_FLAGS_DRV_MODE);
if (CHECK(err, "get_xdp_drv", "errno=%d\n", errno))
goto out;
if (CHECK(prog_id, "prog_id_drv", "unexpected prog_id=%u\n", prog_id))
goto out;
out:
bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0);
out_close:
bpf_object__close(obj);
}