From patchwork Tue Oct 8 16:13:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Hwang X-Patchwork-Id: 13826688 X-Patchwork-Delegate: bpf@iogearbox.net Received: from out-175.mta1.migadu.com (out-175.mta1.migadu.com [95.215.58.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D247C33986 for ; Tue, 8 Oct 2024 16:16:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728404220; cv=none; b=PDv+uBBvsaLZHDJXO+XZ3Ysj4CNXNyM2wTsCsT7erBbGlfT7tQx8LIPu7zuw81JvDh+YcK10hxM0rxU2mu5X86TeQbSpiKZU9te2dxTBWNH9zn2ZfMlRMBc6/KOsyfKKSH9aAVWDdKMOOA0lTHpKIlm8/KAPw0lluuuwcQgjLpE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728404220; c=relaxed/simple; bh=BrTdLoiyecOydf+gQn7r2d++I9wD0GS7HjY1tHl9mQU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VDdzbCvhQe5OGjSJEJqTsoJqVSDw3pkMSuAPUFACWgFMeVCGG1A0cBjUkIt3GOCg6wgudp0GSkINEz490sEn6Kmh0v+MKyw0xF1+JSvDZwIrm8B+nlZS9g6tm0RYTV35lRkYaIbiWnEBNi3vaAq4yo4b0V6a0QNGEj6FWaVwWkY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=BAgStMzA; arc=none smtp.client-ip=95.215.58.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="BAgStMzA" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1728404216; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=LXH4TEyTyCpmffZ/AQBGWW5qkNpq1ttl9gYNsiMSSMw=; b=BAgStMzAQJ/uq2jYWemGSu+1O7pO7z93cvEiJgKYedfMKclRDMN7u3hBRK+Mn/rIfpe9lL Anyux844EA8i73vZevDkzo3t4AlrNJoabCSTo2nI52EcMP9YgzaF8euGf3vKU4dg616/04 N2IOP7k0RCfA2ujK4JA0vxFsho0KK/M= From: Leon Hwang To: bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, toke@redhat.com, martin.lau@kernel.org, yonghong.song@linux.dev, puranjay@kernel.org, xukuohai@huaweicloud.com, eddyz87@gmail.com, iii@linux.ibm.com, leon.hwang@linux.dev, kernel-patches-bot@fb.com, lkp@intel.com Subject: [PATCH bpf-next v6 3/3] selftests/bpf: Add cases to test tailcall in freplace Date: Wed, 9 Oct 2024 00:13:33 +0800 Message-ID: <20241008161333.33469-4-leon.hwang@linux.dev> In-Reply-To: <20241008161333.33469-1-leon.hwang@linux.dev> References: <20241008161333.33469-1-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Patchwork-Delegate: bpf@iogearbox.net cd tools/testing/selftests/bpf; ./test_progs -t tailcalls 335/27 tailcalls/tailcall_bpf2bpf_hierarchy_freplace_1:OK 335/28 tailcalls/tailcall_bpf2bpf_hierarchy_freplace_2:OK 335 tailcalls:OK Summary: 1/28 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Leon Hwang --- .../selftests/bpf/prog_tests/tailcalls.c | 97 +++++++++++++++++++ .../tailcall_bpf2bpf_hierarchy_freplace.c | 30 ++++++ .../testing/selftests/bpf/progs/tc_bpf2bpf.c | 13 +++ 3 files changed, 140 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy_freplace.c diff --git a/tools/testing/selftests/bpf/prog_tests/tailcalls.c b/tools/testing/selftests/bpf/prog_tests/tailcalls.c index fa3f3bb11b098..0564ad6c9b288 100644 --- a/tools/testing/selftests/bpf/prog_tests/tailcalls.c +++ b/tools/testing/selftests/bpf/prog_tests/tailcalls.c @@ -5,6 +5,7 @@ #include "tailcall_poke.skel.h" #include "tailcall_bpf2bpf_hierarchy2.skel.h" #include "tailcall_bpf2bpf_hierarchy3.skel.h" +#include "tailcall_bpf2bpf_hierarchy_freplace.skel.h" #include "tailcall_freplace.skel.h" #include "tc_bpf2bpf.skel.h" @@ -1649,6 +1650,98 @@ static void test_tailcall_bpf2bpf_freplace(void) tc_bpf2bpf__destroy(tc_skel); } +static void test_tailcall_bpf2bpf_hierarchy_freplace(bool freplace_subprog, + bool target_entry2, + int count1, int count2) +{ + struct tailcall_bpf2bpf_hierarchy_freplace *freplace_skel = NULL; + struct bpf_link *freplace_link = NULL; + struct tc_bpf2bpf *tc_skel = NULL; + int prog_fd, map_fd; + char buff[128] = {}; + int err, key, val; + + LIBBPF_OPTS(bpf_test_run_opts, topts, + .data_in = buff, + .data_size_in = sizeof(buff), + .repeat = 1, + ); + + tc_skel = tc_bpf2bpf__open_and_load(); + if (!ASSERT_OK_PTR(tc_skel, "tc_bpf2bpf__open_and_load")) + goto out; + + prog_fd = bpf_program__fd(target_entry2 ? tc_skel->progs.entry_tc_2 : + tc_skel->progs.entry_tc); + freplace_skel = tailcall_bpf2bpf_hierarchy_freplace__open(); + if (!ASSERT_OK_PTR(freplace_skel, "tailcall_bpf2bpf_hierarchy_freplace__open")) + goto out; + + err = bpf_program__set_attach_target(freplace_skel->progs.entry_freplace, + prog_fd, freplace_subprog ? + "subprog_tailcall_tc" : "entry_tc"); + if (!ASSERT_OK(err, "set_attach_target")) + goto out; + + err = tailcall_bpf2bpf_hierarchy_freplace__load(freplace_skel); + if (!ASSERT_OK(err, "tailcall_bpf2bpf_hierarchy_freplace__load")) + goto out; + + val = bpf_program__fd(freplace_skel->progs.entry_freplace); + map_fd = bpf_map__fd(freplace_skel->maps.jmp_table); + key = 0; + err = bpf_map_update_elem(map_fd, &key, &val, BPF_ANY); + if (!ASSERT_OK(err, "update jmp_table")) + goto out; + + freplace_link = bpf_program__attach_freplace(freplace_skel->progs.entry_freplace, + prog_fd, freplace_subprog ? + "subprog_tailcall_tc" : "entry_tc"); + if (!ASSERT_OK_PTR(freplace_link, "attach_freplace")) + goto out; + + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "test_run_opts"); + ASSERT_EQ(topts.retval, count1, "test_run_opts retval"); + + err = bpf_map_delete_elem(map_fd, &key); + if (!ASSERT_OK(err, "delete_elem from jmp_table")) + goto out; + + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "test_run_opts again"); + ASSERT_EQ(topts.retval, count2, "test_run_opts retval again"); + +out: + bpf_link__destroy(freplace_link); + tailcall_bpf2bpf_hierarchy_freplace__destroy(freplace_skel); + tc_bpf2bpf__destroy(tc_skel); +} + +/* test_tailcall_bpf2bpf_hierarchy_freplace_1 checks the count value of tail + * call limit enforcement matches with expectation for the case: + * + * subprog_tail --tailcall-> entry_freplace + * entry_tc --jump-> entry_freplace < + * subprog_tail --tailcall-> entry_freplace + */ +static void test_tailcall_bpf2bpf_hierarchy_freplace_1(void) +{ + test_tailcall_bpf2bpf_hierarchy_freplace(false, false, 34, 35); +} + +/* test_tailcall_bpf2bpf_hierarchy_freplace_2 checks the count value of tail + * call limit enforcement matches with expectation for the case: + * + * subprog_tail --tailcall-> entry_freplace + * entry_tc_2 --> subprog_tailcall_tc (call 10 times) --jump-> entry_freplace < + * subprog_tail --tailcall-> entry_freplace + */ +static void test_tailcall_bpf2bpf_hierarchy_freplace_2(void) +{ + test_tailcall_bpf2bpf_hierarchy_freplace(true, true, 340, 350); +} + void test_tailcalls(void) { if (test__start_subtest("tailcall_1")) @@ -1701,4 +1794,8 @@ void test_tailcalls(void) test_tailcall_freplace(); if (test__start_subtest("tailcall_bpf2bpf_freplace")) test_tailcall_bpf2bpf_freplace(); + if (test__start_subtest("tailcall_bpf2bpf_hierarchy_freplace_1")) + test_tailcall_bpf2bpf_hierarchy_freplace_1(); + if (test__start_subtest("tailcall_bpf2bpf_hierarchy_freplace_2")) + test_tailcall_bpf2bpf_hierarchy_freplace_2(); } diff --git a/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy_freplace.c b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy_freplace.c new file mode 100644 index 0000000000000..6f7c1fac9ddb7 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/tailcall_bpf2bpf_hierarchy_freplace.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include + +struct { + __uint(type, BPF_MAP_TYPE_PROG_ARRAY); + __uint(max_entries, 1); + __uint(key_size, sizeof(__u32)); + __uint(value_size, sizeof(__u32)); +} jmp_table SEC(".maps"); + +int count = 0; + +static __noinline +int subprog_tail(struct __sk_buff *skb) +{ + bpf_tail_call_static(skb, &jmp_table, 0); + return 0; +} + +SEC("freplace") +int entry_freplace(struct __sk_buff *skb) +{ + count++; + subprog_tail(skb); + subprog_tail(skb); + return count; +} + +char __license[] SEC("license") = "GPL"; diff --git a/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c b/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c index 34f3c780194e4..beacf60a52677 100644 --- a/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c +++ b/tools/testing/selftests/bpf/progs/tc_bpf2bpf.c @@ -39,4 +39,17 @@ int entry_tc(struct __sk_buff *skb) return subprog_tailcall_tc(skb); } +SEC("tc") +int entry_tc_2(struct __sk_buff *skb) +{ + int ret, i; + + for (i = 0; i < 10; i++) { + ret = subprog_tailcall_tc(skb); + __sink(ret); + } + + return ret; +} + char __license[] SEC("license") = "GPL";