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3b03791111
Add four tests to tailcalls selftest explicitly named "tailcall_bpf2bpf_X" as their purpose is to validate that combination of tailcalls with bpf2bpf calls are working properly. These tests also validate LD_ABS from subprograms. Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
819 lines
22 KiB
C
819 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include <network_helpers.h>
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/* test_tailcall_1 checks basic functionality by patching multiple locations
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* in a single program for a single tail call slot with nop->jmp, jmp->nop
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* and jmp->jmp rewrites. Also checks for nop->nop.
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*/
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static void test_tailcall_1(void)
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{
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int err, map_fd, prog_fd, main_fd, i, j;
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struct bpf_map *prog_array;
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struct bpf_program *prog;
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struct bpf_object *obj;
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__u32 retval, duration;
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char prog_name[32];
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char buff[128] = {};
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err = bpf_prog_load("tailcall1.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
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&prog_fd);
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if (CHECK_FAIL(err))
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return;
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prog = bpf_object__find_program_by_title(obj, "classifier");
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if (CHECK_FAIL(!prog))
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goto out;
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main_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(main_fd < 0))
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goto out;
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prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
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if (CHECK_FAIL(!prog_array))
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goto out;
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map_fd = bpf_map__fd(prog_array);
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if (CHECK_FAIL(map_fd < 0))
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goto out;
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK_FAIL(!prog))
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goto out;
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prog_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(prog_fd < 0))
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goto out;
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err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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}
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != i, "tailcall",
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"err %d errno %d retval %d\n", err, errno, retval);
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err = bpf_map_delete_elem(map_fd, &i);
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if (CHECK_FAIL(err))
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goto out;
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}
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 3, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK_FAIL(!prog))
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goto out;
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prog_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(prog_fd < 0))
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goto out;
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err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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}
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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j = bpf_map__def(prog_array)->max_entries - 1 - i;
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snprintf(prog_name, sizeof(prog_name), "classifier/%i", j);
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK_FAIL(!prog))
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goto out;
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prog_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(prog_fd < 0))
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goto out;
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err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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}
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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j = bpf_map__def(prog_array)->max_entries - 1 - i;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != j, "tailcall",
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"err %d errno %d retval %d\n", err, errno, retval);
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err = bpf_map_delete_elem(map_fd, &i);
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if (CHECK_FAIL(err))
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goto out;
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}
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 3, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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err = bpf_map_delete_elem(map_fd, &i);
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if (CHECK_FAIL(err >= 0 || errno != ENOENT))
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goto out;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 3, "tailcall",
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"err %d errno %d retval %d\n", err, errno, retval);
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}
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out:
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bpf_object__close(obj);
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}
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/* test_tailcall_2 checks that patching multiple programs for a single
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* tail call slot works. It also jumps through several programs and tests
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* the tail call limit counter.
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*/
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static void test_tailcall_2(void)
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{
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int err, map_fd, prog_fd, main_fd, i;
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struct bpf_map *prog_array;
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struct bpf_program *prog;
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struct bpf_object *obj;
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__u32 retval, duration;
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char prog_name[32];
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char buff[128] = {};
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err = bpf_prog_load("tailcall2.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
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&prog_fd);
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if (CHECK_FAIL(err))
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return;
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prog = bpf_object__find_program_by_title(obj, "classifier");
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if (CHECK_FAIL(!prog))
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goto out;
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main_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(main_fd < 0))
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goto out;
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prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
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if (CHECK_FAIL(!prog_array))
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goto out;
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map_fd = bpf_map__fd(prog_array);
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if (CHECK_FAIL(map_fd < 0))
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goto out;
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK_FAIL(!prog))
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goto out;
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prog_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(prog_fd < 0))
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goto out;
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err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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}
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 2, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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i = 2;
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err = bpf_map_delete_elem(map_fd, &i);
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if (CHECK_FAIL(err))
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goto out;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 1, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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i = 0;
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err = bpf_map_delete_elem(map_fd, &i);
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if (CHECK_FAIL(err))
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goto out;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 3, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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out:
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bpf_object__close(obj);
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}
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/* test_tailcall_3 checks that the count value of the tail call limit
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* enforcement matches with expectations.
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*/
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static void test_tailcall_3(void)
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{
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int err, map_fd, prog_fd, main_fd, data_fd, i, val;
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struct bpf_map *prog_array, *data_map;
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struct bpf_program *prog;
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struct bpf_object *obj;
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__u32 retval, duration;
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char buff[128] = {};
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err = bpf_prog_load("tailcall3.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
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&prog_fd);
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if (CHECK_FAIL(err))
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return;
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prog = bpf_object__find_program_by_title(obj, "classifier");
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if (CHECK_FAIL(!prog))
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goto out;
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main_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(main_fd < 0))
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goto out;
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prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
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if (CHECK_FAIL(!prog_array))
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goto out;
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map_fd = bpf_map__fd(prog_array);
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if (CHECK_FAIL(map_fd < 0))
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goto out;
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prog = bpf_object__find_program_by_title(obj, "classifier/0");
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if (CHECK_FAIL(!prog))
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goto out;
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prog_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(prog_fd < 0))
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goto out;
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i = 0;
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err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 1, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
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if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
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return;
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data_fd = bpf_map__fd(data_map);
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if (CHECK_FAIL(map_fd < 0))
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return;
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i = 0;
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err = bpf_map_lookup_elem(data_fd, &i, &val);
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CHECK(err || val != 33, "tailcall count", "err %d errno %d count %d\n",
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err, errno, val);
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i = 0;
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err = bpf_map_delete_elem(map_fd, &i);
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if (CHECK_FAIL(err))
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goto out;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
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err, errno, retval);
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out:
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bpf_object__close(obj);
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}
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/* test_tailcall_4 checks that the kernel properly selects indirect jump
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* for the case where the key is not known. Latter is passed via global
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* data to select different targets we can compare return value of.
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*/
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static void test_tailcall_4(void)
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{
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int err, map_fd, prog_fd, main_fd, data_fd, i;
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struct bpf_map *prog_array, *data_map;
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struct bpf_program *prog;
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struct bpf_object *obj;
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__u32 retval, duration;
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static const int zero = 0;
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char buff[128] = {};
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char prog_name[32];
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err = bpf_prog_load("tailcall4.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
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&prog_fd);
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if (CHECK_FAIL(err))
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return;
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prog = bpf_object__find_program_by_title(obj, "classifier");
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if (CHECK_FAIL(!prog))
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goto out;
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main_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(main_fd < 0))
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goto out;
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prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
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if (CHECK_FAIL(!prog_array))
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goto out;
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map_fd = bpf_map__fd(prog_array);
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if (CHECK_FAIL(map_fd < 0))
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goto out;
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data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
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if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
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return;
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data_fd = bpf_map__fd(data_map);
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if (CHECK_FAIL(map_fd < 0))
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return;
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK_FAIL(!prog))
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goto out;
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prog_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(prog_fd < 0))
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goto out;
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err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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}
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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err = bpf_map_update_elem(data_fd, &zero, &i, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != i, "tailcall",
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"err %d errno %d retval %d\n", err, errno, retval);
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}
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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err = bpf_map_update_elem(data_fd, &zero, &i, BPF_ANY);
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if (CHECK_FAIL(err))
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goto out;
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err = bpf_map_delete_elem(map_fd, &i);
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if (CHECK_FAIL(err))
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goto out;
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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&duration, &retval, NULL);
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CHECK(err || retval != 3, "tailcall",
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"err %d errno %d retval %d\n", err, errno, retval);
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}
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out:
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bpf_object__close(obj);
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}
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|
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/* test_tailcall_5 probes similarly to test_tailcall_4 that the kernel generates
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* an indirect jump when the keys are const but different from different branches.
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*/
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static void test_tailcall_5(void)
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{
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int err, map_fd, prog_fd, main_fd, data_fd, i, key[] = { 1111, 1234, 5678 };
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struct bpf_map *prog_array, *data_map;
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struct bpf_program *prog;
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struct bpf_object *obj;
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__u32 retval, duration;
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static const int zero = 0;
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char buff[128] = {};
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char prog_name[32];
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err = bpf_prog_load("tailcall5.o", BPF_PROG_TYPE_SCHED_CLS, &obj,
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&prog_fd);
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if (CHECK_FAIL(err))
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return;
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prog = bpf_object__find_program_by_title(obj, "classifier");
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if (CHECK_FAIL(!prog))
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goto out;
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main_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(main_fd < 0))
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goto out;
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prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
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if (CHECK_FAIL(!prog_array))
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goto out;
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map_fd = bpf_map__fd(prog_array);
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if (CHECK_FAIL(map_fd < 0))
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goto out;
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data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
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if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
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return;
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data_fd = bpf_map__fd(data_map);
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if (CHECK_FAIL(map_fd < 0))
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return;
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|
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
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snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK_FAIL(!prog))
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goto out;
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prog_fd = bpf_program__fd(prog);
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if (CHECK_FAIL(prog_fd < 0))
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goto out;
|
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|
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err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
|
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if (CHECK_FAIL(err))
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|
goto out;
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|
}
|
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|
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for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
|
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err = bpf_map_update_elem(data_fd, &zero, &key[i], BPF_ANY);
|
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if (CHECK_FAIL(err))
|
|
goto out;
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|
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err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
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|
&duration, &retval, NULL);
|
|
CHECK(err || retval != i, "tailcall",
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|
"err %d errno %d retval %d\n", err, errno, retval);
|
|
}
|
|
|
|
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
|
|
err = bpf_map_update_elem(data_fd, &zero, &key[i], BPF_ANY);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_map_delete_elem(map_fd, &i);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
|
|
&duration, &retval, NULL);
|
|
CHECK(err || retval != 3, "tailcall",
|
|
"err %d errno %d retval %d\n", err, errno, retval);
|
|
}
|
|
out:
|
|
bpf_object__close(obj);
|
|
}
|
|
|
|
/* test_tailcall_bpf2bpf_1 purpose is to make sure that tailcalls are working
|
|
* correctly in correlation with BPF subprograms
|
|
*/
|
|
static void test_tailcall_bpf2bpf_1(void)
|
|
{
|
|
int err, map_fd, prog_fd, main_fd, i;
|
|
struct bpf_map *prog_array;
|
|
struct bpf_program *prog;
|
|
struct bpf_object *obj;
|
|
__u32 retval, duration;
|
|
char prog_name[32];
|
|
|
|
err = bpf_prog_load("tailcall_bpf2bpf1.o", BPF_PROG_TYPE_SCHED_CLS,
|
|
&obj, &prog_fd);
|
|
if (CHECK_FAIL(err))
|
|
return;
|
|
|
|
prog = bpf_object__find_program_by_title(obj, "classifier");
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
main_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(main_fd < 0))
|
|
goto out;
|
|
|
|
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
|
|
if (CHECK_FAIL(!prog_array))
|
|
goto out;
|
|
|
|
map_fd = bpf_map__fd(prog_array);
|
|
if (CHECK_FAIL(map_fd < 0))
|
|
goto out;
|
|
|
|
/* nop -> jmp */
|
|
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
|
|
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
|
|
|
|
prog = bpf_object__find_program_by_title(obj, prog_name);
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
prog_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(prog_fd < 0))
|
|
goto out;
|
|
|
|
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
}
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
|
|
0, &retval, &duration);
|
|
CHECK(err || retval != 1, "tailcall",
|
|
"err %d errno %d retval %d\n", err, errno, retval);
|
|
|
|
/* jmp -> nop, call subprog that will do tailcall */
|
|
i = 1;
|
|
err = bpf_map_delete_elem(map_fd, &i);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
|
|
0, &retval, &duration);
|
|
CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
|
|
/* make sure that subprog can access ctx and entry prog that
|
|
* called this subprog can properly return
|
|
*/
|
|
i = 0;
|
|
err = bpf_map_delete_elem(map_fd, &i);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
|
|
0, &retval, &duration);
|
|
CHECK(err || retval != sizeof(pkt_v4) * 2,
|
|
"tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
out:
|
|
bpf_object__close(obj);
|
|
}
|
|
|
|
/* test_tailcall_bpf2bpf_2 checks that the count value of the tail call limit
|
|
* enforcement matches with expectations when tailcall is preceded with
|
|
* bpf2bpf call.
|
|
*/
|
|
static void test_tailcall_bpf2bpf_2(void)
|
|
{
|
|
int err, map_fd, prog_fd, main_fd, data_fd, i, val;
|
|
struct bpf_map *prog_array, *data_map;
|
|
struct bpf_program *prog;
|
|
struct bpf_object *obj;
|
|
__u32 retval, duration;
|
|
char buff[128] = {};
|
|
|
|
err = bpf_prog_load("tailcall_bpf2bpf2.o", BPF_PROG_TYPE_SCHED_CLS,
|
|
&obj, &prog_fd);
|
|
if (CHECK_FAIL(err))
|
|
return;
|
|
|
|
prog = bpf_object__find_program_by_title(obj, "classifier");
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
main_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(main_fd < 0))
|
|
goto out;
|
|
|
|
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
|
|
if (CHECK_FAIL(!prog_array))
|
|
goto out;
|
|
|
|
map_fd = bpf_map__fd(prog_array);
|
|
if (CHECK_FAIL(map_fd < 0))
|
|
goto out;
|
|
|
|
prog = bpf_object__find_program_by_title(obj, "classifier/0");
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
prog_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(prog_fd < 0))
|
|
goto out;
|
|
|
|
i = 0;
|
|
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
|
|
&duration, &retval, NULL);
|
|
CHECK(err || retval != 1, "tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
|
|
data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
|
|
if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
|
|
return;
|
|
|
|
data_fd = bpf_map__fd(data_map);
|
|
if (CHECK_FAIL(map_fd < 0))
|
|
return;
|
|
|
|
i = 0;
|
|
err = bpf_map_lookup_elem(data_fd, &i, &val);
|
|
CHECK(err || val != 33, "tailcall count", "err %d errno %d count %d\n",
|
|
err, errno, val);
|
|
|
|
i = 0;
|
|
err = bpf_map_delete_elem(map_fd, &i);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, buff, sizeof(buff), 0,
|
|
&duration, &retval, NULL);
|
|
CHECK(err || retval != 0, "tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
out:
|
|
bpf_object__close(obj);
|
|
}
|
|
|
|
/* test_tailcall_bpf2bpf_3 checks that non-trivial amount of stack (up to
|
|
* 256 bytes) can be used within bpf subprograms that have the tailcalls
|
|
* in them
|
|
*/
|
|
static void test_tailcall_bpf2bpf_3(void)
|
|
{
|
|
int err, map_fd, prog_fd, main_fd, i;
|
|
struct bpf_map *prog_array;
|
|
struct bpf_program *prog;
|
|
struct bpf_object *obj;
|
|
__u32 retval, duration;
|
|
char prog_name[32];
|
|
|
|
err = bpf_prog_load("tailcall_bpf2bpf3.o", BPF_PROG_TYPE_SCHED_CLS,
|
|
&obj, &prog_fd);
|
|
if (CHECK_FAIL(err))
|
|
return;
|
|
|
|
prog = bpf_object__find_program_by_title(obj, "classifier");
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
main_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(main_fd < 0))
|
|
goto out;
|
|
|
|
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
|
|
if (CHECK_FAIL(!prog_array))
|
|
goto out;
|
|
|
|
map_fd = bpf_map__fd(prog_array);
|
|
if (CHECK_FAIL(map_fd < 0))
|
|
goto out;
|
|
|
|
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
|
|
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
|
|
|
|
prog = bpf_object__find_program_by_title(obj, prog_name);
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
prog_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(prog_fd < 0))
|
|
goto out;
|
|
|
|
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
}
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
|
|
&duration, &retval, NULL);
|
|
CHECK(err || retval != sizeof(pkt_v4) * 3,
|
|
"tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
|
|
i = 1;
|
|
err = bpf_map_delete_elem(map_fd, &i);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
|
|
&duration, &retval, NULL);
|
|
CHECK(err || retval != sizeof(pkt_v4),
|
|
"tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
|
|
i = 0;
|
|
err = bpf_map_delete_elem(map_fd, &i);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
|
|
&duration, &retval, NULL);
|
|
CHECK(err || retval != sizeof(pkt_v4) * 2,
|
|
"tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
out:
|
|
bpf_object__close(obj);
|
|
}
|
|
|
|
/* test_tailcall_bpf2bpf_4 checks that tailcall counter is correctly preserved
|
|
* across tailcalls combined with bpf2bpf calls. for making sure that tailcall
|
|
* counter behaves correctly, bpf program will go through following flow:
|
|
*
|
|
* entry -> entry_subprog -> tailcall0 -> bpf_func0 -> subprog0 ->
|
|
* -> tailcall1 -> bpf_func1 -> subprog1 -> tailcall2 -> bpf_func2 ->
|
|
* subprog2 [here bump global counter] --------^
|
|
*
|
|
* We go through first two tailcalls and start counting from the subprog2 where
|
|
* the loop begins. At the end of the test make sure that the global counter is
|
|
* equal to 31, because tailcall counter includes the first two tailcalls
|
|
* whereas global counter is incremented only on loop presented on flow above.
|
|
*/
|
|
static void test_tailcall_bpf2bpf_4(void)
|
|
{
|
|
int err, map_fd, prog_fd, main_fd, data_fd, i, val;
|
|
struct bpf_map *prog_array, *data_map;
|
|
struct bpf_program *prog;
|
|
struct bpf_object *obj;
|
|
__u32 retval, duration;
|
|
char prog_name[32];
|
|
|
|
err = bpf_prog_load("tailcall_bpf2bpf4.o", BPF_PROG_TYPE_SCHED_CLS,
|
|
&obj, &prog_fd);
|
|
if (CHECK_FAIL(err))
|
|
return;
|
|
|
|
prog = bpf_object__find_program_by_title(obj, "classifier");
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
main_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(main_fd < 0))
|
|
goto out;
|
|
|
|
prog_array = bpf_object__find_map_by_name(obj, "jmp_table");
|
|
if (CHECK_FAIL(!prog_array))
|
|
goto out;
|
|
|
|
map_fd = bpf_map__fd(prog_array);
|
|
if (CHECK_FAIL(map_fd < 0))
|
|
goto out;
|
|
|
|
for (i = 0; i < bpf_map__def(prog_array)->max_entries; i++) {
|
|
snprintf(prog_name, sizeof(prog_name), "classifier/%i", i);
|
|
|
|
prog = bpf_object__find_program_by_title(obj, prog_name);
|
|
if (CHECK_FAIL(!prog))
|
|
goto out;
|
|
|
|
prog_fd = bpf_program__fd(prog);
|
|
if (CHECK_FAIL(prog_fd < 0))
|
|
goto out;
|
|
|
|
err = bpf_map_update_elem(map_fd, &i, &prog_fd, BPF_ANY);
|
|
if (CHECK_FAIL(err))
|
|
goto out;
|
|
}
|
|
|
|
err = bpf_prog_test_run(main_fd, 1, &pkt_v4, sizeof(pkt_v4), 0,
|
|
&duration, &retval, NULL);
|
|
CHECK(err || retval != sizeof(pkt_v4) * 3, "tailcall", "err %d errno %d retval %d\n",
|
|
err, errno, retval);
|
|
|
|
data_map = bpf_object__find_map_by_name(obj, "tailcall.bss");
|
|
if (CHECK_FAIL(!data_map || !bpf_map__is_internal(data_map)))
|
|
return;
|
|
|
|
data_fd = bpf_map__fd(data_map);
|
|
if (CHECK_FAIL(map_fd < 0))
|
|
return;
|
|
|
|
i = 0;
|
|
err = bpf_map_lookup_elem(data_fd, &i, &val);
|
|
CHECK(err || val != 31, "tailcall count", "err %d errno %d count %d\n",
|
|
err, errno, val);
|
|
|
|
out:
|
|
bpf_object__close(obj);
|
|
}
|
|
|
|
void test_tailcalls(void)
|
|
{
|
|
if (test__start_subtest("tailcall_1"))
|
|
test_tailcall_1();
|
|
if (test__start_subtest("tailcall_2"))
|
|
test_tailcall_2();
|
|
if (test__start_subtest("tailcall_3"))
|
|
test_tailcall_3();
|
|
if (test__start_subtest("tailcall_4"))
|
|
test_tailcall_4();
|
|
if (test__start_subtest("tailcall_5"))
|
|
test_tailcall_5();
|
|
if (test__start_subtest("tailcall_bpf2bpf_1"))
|
|
test_tailcall_bpf2bpf_1();
|
|
if (test__start_subtest("tailcall_bpf2bpf_2"))
|
|
test_tailcall_bpf2bpf_2();
|
|
if (test__start_subtest("tailcall_bpf2bpf_3"))
|
|
test_tailcall_bpf2bpf_3();
|
|
if (test__start_subtest("tailcall_bpf2bpf_4"))
|
|
test_tailcall_bpf2bpf_4();
|
|
}
|