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SubjectRe: [PATCH bpf-next] bpf: Add bpf_read_raw_record() helper
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> On Aug 25, 2022, at 9:57 AM, Namhyung Kim <namhyung@kernel.org> wrote:
>
> On Tue, Aug 23, 2022 at 10:32 PM John Fastabend
> <john.fastabend@gmail.com> wrote:
>> Namhyung Kim wrote:
>>> Ok, now I think that I can use a bpf-output sw event. It would need
>>> another BPF program to write data to the event and the test program
>>> can read it from BPF using this helper. :)
>>
>> Ah good idea. Feel free to carry my ACK to the v2 with the test.
>
> Hmm.. it seems not to work because
> 1. bpf_output sw event doesn't have the overflow mechanism and it
> doesn't call the bpf program.
> 2. even if I added it, it couldn't run due to the recursion protection by
> bpf_prog_active.

How about we enable some raw record for a software event? Something not
controlled by BPF?

If this doesn't work, a self test that only runs on some hardware is also
helpful.

Thanks,
Song

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