From: Eduard Zingerman <eddyz87@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org,
daniel@iogearbox.net, martin.lau@linux.dev, kernel-team@fb.com,
yonghong.song@linux.dev, memxor@gmail.com, awerner32@gmail.com
Subject: Re: [PATCH bpf 09/12] selftests/bpf: test widening for iterating callbacks
Date: Fri, 17 Nov 2023 20:53:05 +0200 [thread overview]
Message-ID: <8debf74caf92472d40e34fef20658727e541f3b1.camel@gmail.com> (raw)
In-Reply-To: <CAEf4BzZ+rMakBnBKnqOCsxM4XqSfraaqaEE1wdfrhAwLOP1x6A@mail.gmail.com>
On Fri, 2023-11-17 at 11:47 -0500, Andrii Nakryiko wrote:
> On Wed, Nov 15, 2023 at 9:18 PM Eduard Zingerman <eddyz87@gmail.com> wrote:
> >
> > A test case to verify that imprecise scalars widening is applied to
> > callback bodies on repetative iteration.
>
> typo: repetitive? repeating? successive? subsequent?
I'll configure spell-checking, I promise.
[...]
> > +static int widening_cb(__u32 idx, struct num_context *ctx)
> > +{
> > + ++ctx->i;
> > + return 0;
> > +}
> > +
> > +SEC("?raw_tp")
> > +__success
> > +int widening(void *unused)
> > +{
> > + struct num_context loop_ctx = { .i = 0, .j = 1 };
> > +
> > + bpf_loop(100, widening_cb, &loop_ctx, 0);
> > + /* loop_ctx.j is not changed during callback iteration,
> > + * verifier should not apply widening to it.
> > + */
> > + return choice_arr[loop_ctx.j];
>
> would the test be a bit more interesting if you use loop_ctx.i here?
> `return choice_arr[loop_ctx.i & 1];` ?
It would force precision for 'loop_ctx.i', precise values are not widened.
>
> > +}
> > +
next prev parent reply other threads:[~2023-11-17 18:53 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-16 2:17 [PATCH bpf 00/12] verify callbacks as if they are called unknown number of times Eduard Zingerman
2023-11-16 2:17 ` [PATCH bpf 01/12] selftests/bpf: track tcp payload offset as scalar in xdp_synproxy Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-16 2:17 ` [PATCH bpf 02/12] selftests/bpf: track string payload offset as scalar in strobemeta Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-17 18:52 ` Eduard Zingerman
2023-11-16 2:17 ` [PATCH bpf 03/12] selftests/bpf: fix bpf_loop_bench for new callback verification scheme Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-17 18:52 ` Eduard Zingerman
2023-11-17 21:38 ` Alexei Starovoitov
2023-11-17 21:43 ` Eduard Zingerman
2023-11-17 21:47 ` Alexei Starovoitov
2023-11-17 21:50 ` Eduard Zingerman
2023-11-17 21:55 ` Alexei Starovoitov
2023-11-16 2:17 ` [PATCH bpf 04/12] bpf: extract __check_reg_arg() utility function Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-16 2:17 ` [PATCH bpf 05/12] bpf: extract setup_func_entry() " Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-17 18:52 ` Eduard Zingerman
2023-11-16 2:17 ` [PATCH bpf 06/12] bpf: verify callbacks as if they are called unknown number of times Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-17 18:52 ` Eduard Zingerman
2023-11-17 20:27 ` Andrii Nakryiko
2023-11-17 21:03 ` Eduard Zingerman
2023-11-16 2:17 ` [PATCH bpf 07/12] selftests/bpf: tests for iterating callbacks Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-16 2:17 ` [PATCH bpf 08/12] bpf: widening for callback iterators Eduard Zingerman
2023-11-17 16:46 ` Andrii Nakryiko
2023-11-16 2:18 ` [PATCH bpf 09/12] selftests/bpf: test widening for iterating callbacks Eduard Zingerman
2023-11-17 16:47 ` Andrii Nakryiko
2023-11-17 18:53 ` Eduard Zingerman [this message]
2023-11-17 20:28 ` Andrii Nakryiko
2023-11-16 2:18 ` [PATCH bpf 10/12] bpf: keep track of max number of bpf_loop callback iterations Eduard Zingerman
2023-11-16 14:08 ` Andrii Nakryiko
2023-11-16 14:13 ` Eduard Zingerman
2023-11-17 16:47 ` Andrii Nakryiko
2023-11-17 18:53 ` Eduard Zingerman
2023-11-17 20:30 ` Andrii Nakryiko
2023-11-16 2:18 ` [PATCH bpf 11/12] selftests/bpf: add __not_msg annotation for test_loader based tests Eduard Zingerman
2023-11-17 16:45 ` Andrii Nakryiko
2023-11-17 18:53 ` Eduard Zingerman
2023-11-17 20:31 ` Andrii Nakryiko
2023-11-17 21:10 ` Eduard Zingerman
2023-11-17 21:33 ` Alexei Starovoitov
2023-11-16 2:18 ` [PATCH bpf 12/12] selftests/bpf: check if max number of bpf_loop iterations is tracked Eduard Zingerman
2023-11-17 16:47 ` Andrii Nakryiko
2023-11-17 18:53 ` Eduard Zingerman
2023-11-17 20:32 ` Andrii Nakryiko
2023-11-17 21:18 ` Eduard Zingerman
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