clang supports arbitrary length ints using the _ExtInt extension. This
can be useful to hold very large values, e.g. 256 bit or 512 bit types.
Larger types (e.g. 1024 bits) are possible but I am unaware of a use
case for these.
This requires the _ExtInt extension enabled in clang, which is under
review.
Link: https://clang.llvm.org/docs/LanguageExtensions.html#extended-integer-types
Link: https://reviews.llvm.org/D93103
Signed-off-by: Sean Young
---
tools/testing/selftests/bpf/Makefile | 3 +-
tools/testing/selftests/bpf/prog_tests/btf.c | 3 +-
.../selftests/bpf/progs/test_btf_extint.c | 50 ++
tools/testing/selftests/bpf/test_extint.py| 535 ++
4 files changed, 589 insertions(+), 2 deletions(-)
create mode 100644 tools/testing/selftests/bpf/progs/test_btf_extint.c
create mode 100755 tools/testing/selftests/bpf/test_extint.py
diff --git a/tools/testing/selftests/bpf/Makefile
b/tools/testing/selftests/bpf/Makefile
index 8c33e999319a..436ad1aed3d9 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -70,7 +70,8 @@ TEST_PROGS := test_kmod.sh \
test_bpftool_build.sh \
test_bpftool.sh \
test_bpftool_metadata.sh \
- test_xsk.sh
+ test_xsk.sh \
+ test_extint.py
TEST_PROGS_EXTENDED := with_addr.sh \
with_tunnels.sh \
diff --git a/tools/testing/selftests/bpf/prog_tests/btf.c
b/tools/testing/selftests/bpf/prog_tests/btf.c
index 8ae97e2a4b9d..96a93502cf27 100644
--- a/tools/testing/selftests/bpf/prog_tests/btf.c
+++ b/tools/testing/selftests/bpf/prog_tests/btf.c
@@ -4073,6 +4073,7 @@ struct btf_file_test {
static struct btf_file_test file_tests[] = {
{ .file = "test_btf_haskv.o", },
{ .file = "test_btf_newkv.o", },
+ { .file = "test_btf_extint.o", },
{ .file = "test_btf_nokv.o", .btf_kv_notfound = true, },
};
@@ -4414,7 +4415,7 @@ static struct btf_raw_test pprint_test_template[] = {
* will have both int and enum types.
*/
.raw_types = {
- /* unsighed char */ /* [1] */
+ /* unsigned char */ /* [1] */
BTF_TYPE_INT_ENC(NAME_TBD, 0, 0, 8, 1),
/* unsigned short *//* [2] */
BTF_TYPE_INT_ENC(NAME_TBD, 0, 0, 16, 2),
diff --git a/tools/testing/selftests/bpf/progs/test_btf_extint.c
b/tools/testing/selftests/bpf/progs/test_btf_extint.c
new file mode 100644
index ..b0fa9f130dda
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_btf_extint.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+#include
+#include
+#include "bpf_legacy.h"
+
+struct extint {
+ _ExtInt(256) v256;
+ _ExtInt(512) v512;
+};
+
+struct bpf_map_def SEC("maps") btf_map = {
+ .type = BPF_MAP_TYPE_ARRAY,
+ .key_size = sizeof(int),
+ .value_size = sizeof(struct extint),
+ .max_entries = 1,
+};
+
+BPF_ANNOTATE_KV_PAIR(btf_map, int, struct extint);
+
+__attribute__((noinline))
+int test_long_fname_2(void)
+{
+ struct extint *bi;
+ int key = 0;
+
+ bi = bpf_map_lookup_elem(&btf_map, &key);
+ if (!bi)
+ return 0;
+
+ bi->v256 <<= 64;
+ bi->v256 += (_ExtInt(256))0xcafedead;
+ bi->v512 <<= 128;
+ bi->v512 += (_ExtInt(512))0xff00ff00ff00ffull;
+
+ return 0;
+}
+
+__attribute__((noinline))
+int test_long_fname_1(void)
+{
+ return test_long_fname_2();
+}
+
+SEC("dummy_tracepoint")
+int _dummy_tracepoint(void *arg)
+{
+ return test_long_fname_1();
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/test_extint.py
b/tools/testing/selftests/bpf/test_extint.py
new file mode 100755
index ..86af815a0cf6
--- /dev/null
+++ b/tools/testing/selftests/bpf/test_extint.py
@@ -0,0 +1,535 @@
+#!/usr/bin/python3
+# SPDX-License-Identifier: GPL-2.0
+
+# Copyright (C) 2020 Sean Young
+# Copyright (C) 2017 Netronome Systems, Inc.
+# Copyright (c) 2019 Mellanox Technologies. All rights reserved
+#
+# This software is licensed under the GNU General License Version 2,
+# June 1991 as shown in the file COPYING in the top-level directory of this
+# source tree.
+#
+# THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
+# WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+# BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
+# OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
+# THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+from datetime import datetime
+import argparse
+import errno
+import json
+import os
+import pprint
+import random
+import re
+import stat
+import string
+import struct
+import subprocess
+import time
+import traceback
+
+logfile = None
+log_level = 1
+skip_extack = False
