diff options
| author | Paul Chaignon <paul.chaignon@gmail.com> | 2023-11-06 10:17:24 +0100 |
|---|---|---|
| committer | Aleksandr Nogikh <nogikh@google.com> | 2023-11-06 18:08:10 +0000 |
| commit | 8321139737ed27c82617231b782e88dd1e818227 (patch) | |
| tree | 5ea9811e07ff388dd4cb64553f083191963f7caf /sys/linux/test | |
| parent | b1547b1e6ffceaa58562db48077ea5588372eacd (diff) | |
sys/linux/test: test case for bpf_tail_call helper
This test case corresponds to the BPF program below (bcc syntax for the
map).
BPF_PROG_ARRAY(prog_array, 10);
int tail_call_prog(void *ctx) {
char str[8] = {0};
u64 data = 0x1234;
bpf_snprintf(str, sizeof(str), "%d ", &data, sizeof(data));
return 0;
}
int do_tail_call(void *ctx) {
prog_array.call(ctx, 0);
return 0;
}
It reuses the program defined to test bpf_snprintf, as the target of the
tail call.
Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Diffstat (limited to 'sys/linux/test')
| -rw-r--r-- | sys/linux/test/bpf_helpers | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/linux/test/bpf_helpers b/sys/linux/test/bpf_helpers index 2e9287eda..b625b68a2 100644 --- a/sys/linux/test/bpf_helpers +++ b/sys/linux/test/bpf_helpers @@ -13,3 +13,10 @@ r3 = bpf$BPF_MAP_CONST_STR_FREEZE(AUTO, &AUTO={r1, r1}, 0x4) r4 = bpf$PROG_LOAD(AUTO, &AUTO={0x3, AUTO, &AUTO=@framed={{AUTO, AUTO, AUTO, AUTO, 0x0, AUTO, AUTO, AUTO, 0x0}, [@snprintf={{AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, 0x1234}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, r1, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO}}], {AUTO, AUTO, AUTO, AUTO}}, &AUTO='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x0, "00000000000000000000000000000000", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0xa0) r5 = bpf$BPF_PROG_TEST_RUN(AUTO, &AUTO={r4, AUTO, 0x10, 0x10, &AUTO="0000000000000000", &AUTO="0000000000000000", 0x1, AUTO, 0x0, 0x0, 0x0, 0x0, 0x0, AUTO, 0x0}, 0x4c) + +# Prepare, load, and execute a BPF program that performs a tail call to the bpf_snprintf program. + +r10 = bpf$MAP_CREATE_TAIL_CALL(AUTO, &AUTO={AUTO, AUTO, AUTO, AUTO, AUTO, 0x0, 0x0, "00000000000000000000000000000000", 0x0, 0x0, 0x0, 0x0, 0x0, AUTO}, 0x48) +r11 = bpf$MAP_UPDATE_ELEM_TAIL_CALL(AUTO, &AUTO={{r10, r10}, &AUTO=0x0, &AUTO=r4, AUTO}, 0x1c) + +r4 = bpf$PROG_LOAD(AUTO, &AUTO={0x3, AUTO, &AUTO=@framed={{AUTO, AUTO, AUTO, AUTO, 0x0, AUTO, AUTO, AUTO, 0x0}, [@tail_call={{AUTO, AUTO, AUTO, AUTO, r10, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO}, {AUTO, AUTO, AUTO, AUTO, AUTO, AUTO, AUTO}}], {AUTO, AUTO, AUTO, AUTO}}, &AUTO='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x0, "00000000000000000000000000000000", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0xa0) |