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2023-03-08selftests/bpf: implement and test custom testmod_seq iteratorAndrii Nakryiko1-0/+42
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 <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Alexei Starovoitov <[email protected]>
2023-03-08selftests/bpf: add number iterator testsAndrii Nakryiko1-0/+49
Add number iterator (bpf_iter_num_{new,next,destroy}()) tests, validating the correct handling of various corner and common cases *at runtime*. Signed-off-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Alexei Starovoitov <[email protected]>
2023-03-08selftests/bpf: add iterators testsAndrii Nakryiko1-0/+15
Add various tests for open-coded iterators. Some of them excercise various possible coding patterns in C, some go down to low-level assembly for more control over various conditions, especially invalid ones. We also make use of bpf_for(), bpf_for_each(), bpf_repeat() macros in some of these tests. Signed-off-by: Andrii Nakryiko <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Alexei Starovoitov <[email protected]>