// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include <test_progs.h>
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#include <sys/stat.h>
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#include "test_link_pinning.skel.h"
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static int duration = 0;
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void test_link_pinning_subtest(struct bpf_program *prog,
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struct test_link_pinning__bss *bss)
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{
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const char *link_pin_path = "/sys/fs/bpf/pinned_link_test";
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struct stat statbuf = {};
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struct bpf_link *link;
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int err, i;
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link = bpf_program__attach(prog);
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if (CHECK(IS_ERR(link), "link_attach", "err: %ld\n", PTR_ERR(link)))
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goto cleanup;
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bss->in = 1;
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usleep(1);
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CHECK(bss->out != 1, "res_check1", "exp %d, got %d\n", 1, bss->out);
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/* pin link */
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err = bpf_link__pin(link, link_pin_path);
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if (CHECK(err, "link_pin", "err: %d\n", err))
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goto cleanup;
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CHECK(strcmp(link_pin_path, bpf_link__pin_path(link)), "pin_path1",
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"exp %s, got %s\n", link_pin_path, bpf_link__pin_path(link));
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/* check that link was pinned */
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err = stat(link_pin_path, &statbuf);
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if (CHECK(err, "stat_link", "err %d errno %d\n", err, errno))
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goto cleanup;
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bss->in = 2;
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usleep(1);
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CHECK(bss->out != 2, "res_check2", "exp %d, got %d\n", 2, bss->out);
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/* destroy link, pinned link should keep program attached */
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bpf_link__destroy(link);
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link = NULL;
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bss->in = 3;
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usleep(1);
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CHECK(bss->out != 3, "res_check3", "exp %d, got %d\n", 3, bss->out);
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/* re-open link from BPFFS */
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link = bpf_link__open(link_pin_path);
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if (CHECK(IS_ERR(link), "link_open", "err: %ld\n", PTR_ERR(link)))
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goto cleanup;
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CHECK(strcmp(link_pin_path, bpf_link__pin_path(link)), "pin_path2",
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"exp %s, got %s\n", link_pin_path, bpf_link__pin_path(link));
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/* unpin link from BPFFS, program still attached */
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err = bpf_link__unpin(link);
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if (CHECK(err, "link_unpin", "err: %d\n", err))
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goto cleanup;
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/* still active, as we have FD open now */
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bss->in = 4;
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usleep(1);
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CHECK(bss->out != 4, "res_check4", "exp %d, got %d\n", 4, bss->out);
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bpf_link__destroy(link);
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link = NULL;
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/* Validate it's finally detached.
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* Actual detachment might get delayed a bit, so there is no reliable
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* way to validate it immediately here, let's count up for long enough
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* and see if eventually output stops being updated
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*/
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for (i = 5; i < 10000; i++) {
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bss->in = i;
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usleep(1);
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if (bss->out == i - 1)
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break;
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}
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CHECK(i == 10000, "link_attached", "got to iteration #%d\n", i);
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cleanup:
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if (!IS_ERR(link))
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bpf_link__destroy(link);
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}
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void test_link_pinning(void)
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{
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struct test_link_pinning* skel;
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skel = test_link_pinning__open_and_load();
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if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
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return;
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if (test__start_subtest("pin_raw_tp"))
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test_link_pinning_subtest(skel->progs.raw_tp_prog, skel->bss);
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if (test__start_subtest("pin_tp_btf"))
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test_link_pinning_subtest(skel->progs.tp_btf_prog, skel->bss);
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test_link_pinning__destroy(skel);
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}
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