7e86a8c4ac
Implement a trivial iterator returning same specified integer value N times as part of bpf_testmod kernel module. Add selftests to validate everything works end to end. We also reuse these tests as "verification-only" tests to validate that kernel prints the state of custom kernel module-defined iterator correctly: fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0) "testmod_seq" part is an iterator type, and is coming from module's BTF data dynamically at runtime. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/r/20230308184121.1165081-9-andrii@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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struct bpf_iter_testmod_seq {
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u64 :64;
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u64 :64;
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};
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extern int bpf_iter_testmod_seq_new(struct bpf_iter_testmod_seq *it, s64 value, int cnt) __ksym;
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extern s64 *bpf_iter_testmod_seq_next(struct bpf_iter_testmod_seq *it) __ksym;
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extern void bpf_iter_testmod_seq_destroy(struct bpf_iter_testmod_seq *it) __ksym;
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const volatile __s64 exp_empty = 0 + 1;
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__s64 res_empty;
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SEC("raw_tp/sys_enter")
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__success __log_level(2)
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__msg("fp-16_w=iter_testmod_seq(ref_id=1,state=active,depth=0)")
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__msg("fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0)")
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__msg("call bpf_iter_testmod_seq_destroy")
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int testmod_seq_empty(const void *ctx)
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{
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__s64 sum = 0, *i;
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bpf_for_each(testmod_seq, i, 1000, 0) sum += *i;
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res_empty = 1 + sum;
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return 0;
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}
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const volatile __s64 exp_full = 1000000;
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__s64 res_full;
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SEC("raw_tp/sys_enter")
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__success __log_level(2)
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__msg("fp-16_w=iter_testmod_seq(ref_id=1,state=active,depth=0)")
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__msg("fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0)")
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__msg("call bpf_iter_testmod_seq_destroy")
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int testmod_seq_full(const void *ctx)
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{
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__s64 sum = 0, *i;
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bpf_for_each(testmod_seq, i, 1000, 1000) sum += *i;
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res_full = sum;
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return 0;
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}
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const volatile __s64 exp_truncated = 10 * 1000000;
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__s64 res_truncated;
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static volatile int zero = 0;
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SEC("raw_tp/sys_enter")
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__success __log_level(2)
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__msg("fp-16_w=iter_testmod_seq(ref_id=1,state=active,depth=0)")
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__msg("fp-16=iter_testmod_seq(ref_id=1,state=drained,depth=0)")
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__msg("call bpf_iter_testmod_seq_destroy")
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int testmod_seq_truncated(const void *ctx)
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{
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__s64 sum = 0, *i;
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int cnt = zero;
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bpf_for_each(testmod_seq, i, 10, 2000000) {
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sum += *i;
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cnt++;
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if (cnt >= 1000000)
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break;
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}
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res_truncated = sum;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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