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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9d120b4127
The previous libbpf patch allows user to specify "prog_flags" to bpf program load APIs. To enable high 32-bit randomization for a test, we need to set BPF_F_TEST_RND_HI32 in "prog_flags". To enable such randomization for all tests, we need to make sure all places are passing BPF_F_TEST_RND_HI32. Changing them one by one is not convenient, also, it would be better if a test could be switched to "normal" running mode without code change. Given the program load APIs used across bpf selftests are mostly: bpf_prog_load: load from file bpf_load_program: load from raw insns A test_stub.c is implemented for bpf seltests, it offers two functions for testing purpose: bpf_prog_test_load bpf_test_load_program The are the same as "bpf_prog_load" and "bpf_load_program", except they also set BPF_F_TEST_RND_HI32. Given *_xattr functions are the APIs to customize any "prog_flags", it makes little sense to put these two functions into libbpf. Then, the following CFLAGS are passed to compilations for host programs: -Dbpf_prog_load=bpf_prog_test_load -Dbpf_load_program=bpf_test_load_program They migrate the used load APIs to the test version, hence enable high 32-bit randomization for these tests without changing source code. Besides all these, there are several testcases are using "bpf_prog_load_attr" directly, their call sites are updated to pass BPF_F_TEST_RND_HI32. Signed-off-by: Jiong Wang <jiong.wang@netronome.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (C) 2019 Netronome Systems, Inc. */
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include <string.h>
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int bpf_prog_test_load(const char *file, enum bpf_prog_type type,
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struct bpf_object **pobj, int *prog_fd)
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{
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struct bpf_prog_load_attr attr;
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memset(&attr, 0, sizeof(struct bpf_prog_load_attr));
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attr.file = file;
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attr.prog_type = type;
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attr.expected_attach_type = 0;
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attr.prog_flags = BPF_F_TEST_RND_HI32;
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return bpf_prog_load_xattr(&attr, pobj, prog_fd);
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}
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int bpf_test_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
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size_t insns_cnt, const char *license,
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__u32 kern_version, char *log_buf,
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size_t log_buf_sz)
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{
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struct bpf_load_program_attr load_attr;
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memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
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load_attr.prog_type = type;
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load_attr.expected_attach_type = 0;
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load_attr.name = NULL;
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load_attr.insns = insns;
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load_attr.insns_cnt = insns_cnt;
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load_attr.license = license;
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load_attr.kern_version = kern_version;
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load_attr.prog_flags = BPF_F_TEST_RND_HI32;
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return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
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}
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