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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Andrii Nakryiko <andriin@fb.com>, bpf <bpf@vger.kernel.org>,
	Networking <netdev@vger.kernel.org>,
	Alexei Starovoitov <ast@fb.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Kernel Team <kernel-team@fb.com>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Jonathan Lemon <jonathan.lemon@gmail.com>
Subject: Re: [PATCH v2 bpf-next 3/7] bpf: track reference type in verifier
Date: Fri, 22 May 2020 11:53:26 -0700
Message-ID: <CAEf4BzYqzJmRfCxtY6qqRZ0vfR7kDsMLvGgT1iENZ82WAh0TVg@mail.gmail.com> (raw)
In-Reply-To: <20200522011335.f4bfabh32puptotu@ast-mbp.dhcp.thefacebook.com>

On Thu, May 21, 2020 at 6:13 PM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> On Sun, May 17, 2020 at 12:57:23PM -0700, Andrii Nakryiko wrote:
> >
> > +static enum bpf_ref_type get_release_ref_type(enum bpf_func_id func_id)
> > +{
> > +     switch (func_id) {
> > +     case BPF_FUNC_sk_release:
> > +             return BPF_REF_SOCKET;
> > +     case BPF_FUNC_ringbuf_submit:
> > +     case BPF_FUNC_ringbuf_discard:
> > +             return BPF_REF_RINGBUF;
> > +     default:
> > +             return BPF_REF_INVALID;
> > +     }
> > +}
> > +
> >  static bool may_be_acquire_function(enum bpf_func_id func_id)
> >  {
> >       return func_id == BPF_FUNC_sk_lookup_tcp ||
> > @@ -464,6 +477,28 @@ static bool is_acquire_function(enum bpf_func_id func_id,
> >       return false;
> >  }
> >
> > +static enum bpf_ref_type get_acquire_ref_type(enum bpf_func_id func_id,
> > +                                           const struct bpf_map *map)
> > +{
> > +     enum bpf_map_type map_type = map ? map->map_type : BPF_MAP_TYPE_UNSPEC;
> > +
> > +     switch (func_id) {
> > +     case BPF_FUNC_sk_lookup_tcp:
> > +     case BPF_FUNC_sk_lookup_udp:
> > +     case BPF_FUNC_skc_lookup_tcp:
> > +             return BPF_REF_SOCKET;
> > +     case BPF_FUNC_map_lookup_elem:
> > +             if (map_type == BPF_MAP_TYPE_SOCKMAP ||
> > +                 map_type == BPF_MAP_TYPE_SOCKHASH)
> > +                     return BPF_REF_SOCKET;
> > +             return BPF_REF_INVALID;
> > +     case BPF_FUNC_ringbuf_reserve:
> > +             return BPF_REF_RINGBUF;
> > +     default:
> > +             return BPF_REF_INVALID;
> > +     }
> > +}
>
> Two switch() stmts to convert helpers to REF is kinda hacky.
> I think get_release_ref_type() could have got the ref's type as btf_id from its
> arguments which would have made it truly generic and 'enum bpf_ref_type' would
> be unnecessary, but sk_lookup_* helpers return u64 and don't have btf_id of
> return value. I think we better fix that. Then btf_id would be that ref type.

True, sure. I'll drop this patch in next version, because everything
works without it. Then we can generalize this eventually.

  reply index

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-17 19:57 [PATCH v2 bpf-next 0/7] BPF ring buffer Andrii Nakryiko
2020-05-17 19:57 ` [PATCH v2 bpf-next 1/7] bpf: implement BPF ring buffer and verifier support for it Andrii Nakryiko
2020-05-19 12:57   ` kbuild test robot
2020-05-19 23:53   ` kbuild test robot
2020-05-22  0:25   ` Paul E. McKenney
2020-05-22 18:46     ` Andrii Nakryiko
2020-05-25 16:01       ` Paul E. McKenney
2020-05-25 18:45         ` Andrii Nakryiko
2020-05-22  1:07   ` Alexei Starovoitov
2020-05-22 18:48     ` Andrii Nakryiko
2020-05-25 20:34     ` Andrii Nakryiko
2020-05-17 19:57 ` [PATCH v2 bpf-next 2/7] tools/memory-model: add BPF ringbuf MPSC litmus tests Andrii Nakryiko
2020-05-22  0:34   ` Paul E. McKenney
2020-05-22 18:51     ` Andrii Nakryiko
2020-05-25 23:33       ` Andrii Nakryiko
2020-05-26  3:05         ` Paul E. McKenney
2020-05-17 19:57 ` [PATCH v2 bpf-next 3/7] bpf: track reference type in verifier Andrii Nakryiko
2020-05-22  1:13   ` Alexei Starovoitov
2020-05-22 18:53     ` Andrii Nakryiko [this message]
2020-05-17 19:57 ` [PATCH v2 bpf-next 4/7] libbpf: add BPF ring buffer support Andrii Nakryiko
2020-05-22  1:15   ` Alexei Starovoitov
2020-05-22 18:56     ` Andrii Nakryiko
2020-05-17 19:57 ` [PATCH v2 bpf-next 5/7] selftests/bpf: add BPF ringbuf selftests Andrii Nakryiko
2020-05-22  1:20   ` Alexei Starovoitov
2020-05-22 18:58     ` Andrii Nakryiko
2020-05-17 19:57 ` [PATCH v2 bpf-next 6/7] bpf: add BPF ringbuf and perf buffer benchmarks Andrii Nakryiko
2020-05-22  1:21   ` Alexei Starovoitov
2020-05-22 19:07     ` Andrii Nakryiko
2020-05-17 19:57 ` [PATCH v2 bpf-next 7/7] docs/bpf: add BPF ring buffer design notes Andrii Nakryiko
2020-05-22  1:23   ` Alexei Starovoitov
2020-05-22 19:08     ` Andrii Nakryiko
2020-05-25  9:59   ` Alban Crequy
2020-05-25 19:12     ` Andrii Nakryiko

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