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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/bpf/progs/test_mmap.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_mmap.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_mmap.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_mmap.c b/tools/testing/selftests/bpf/progs/test_mmap.c new file mode 100644 index 000000000..4eb42cff5 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_mmap.c @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include <linux/bpf.h> +#include <stdint.h> +#include <bpf/bpf_helpers.h> + +char _license[] SEC("license") = "GPL"; + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 4096); + __uint(map_flags, BPF_F_MMAPABLE | BPF_F_RDONLY_PROG); + __type(key, __u32); + __type(value, char); +} rdonly_map SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 512 * 4); /* at least 4 pages of data */ + __uint(map_flags, BPF_F_MMAPABLE); + __type(key, __u32); + __type(value, __u64); +} data_map SEC(".maps"); + +__u64 in_val = 0; +__u64 out_val = 0; + +SEC("raw_tracepoint/sys_enter") +int test_mmap(void *ctx) +{ + int zero = 0, one = 1, two = 2, far = 1500; + __u64 val, *p; + + out_val = in_val; + + /* data_map[2] = in_val; */ + bpf_map_update_elem(&data_map, &two, (const void *)&in_val, 0); + + /* data_map[1] = data_map[0] * 2; */ + p = bpf_map_lookup_elem(&data_map, &zero); + if (p) { + val = (*p) * 2; + bpf_map_update_elem(&data_map, &one, &val, 0); + } + + /* data_map[far] = in_val * 3; */ + val = in_val * 3; + bpf_map_update_elem(&data_map, &far, &val, 0); + + return 0; +} + |