From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Hao Luo <haoluo@google.com>, Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, KP Singh <kpsingh@kernel.org>,
bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH bpf-next v1 4/9] bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX | PTR_MAYBE_NULL
Date: Thu, 9 Dec 2021 13:45:27 -0800 [thread overview]
Message-ID: <CAADnVQJzq5j2WecExdzwG+oc8iTP3pSm5OXsmF5cLQvPKHNKeA@mail.gmail.com> (raw)
In-Reply-To: <CAEf4BzZ1-5Tbq5MXkJ=8REFGRFs5aXnT0aGbaQkWYKVo4vuqcA@mail.gmail.com>
On Wed, Dec 8, 2021 at 12:04 PM Andrii Nakryiko
<andrii.nakryiko@gmail.com> wrote:
>
> > > > +static const char *reg_type_str(enum bpf_reg_type type)
> > > > +{
> > > > + static const char * const str[] = {
> > > > + [NOT_INIT] = "?",
> > > > + [SCALAR_VALUE] = "inv",
> > > > + [PTR_TO_CTX] = "ctx",
> > > > + [CONST_PTR_TO_MAP] = "map_ptr",
> > > > + [PTR_TO_MAP_VALUE] = "map_value",
> > > > + [PTR_TO_STACK] = "fp",
> > > > + [PTR_TO_PACKET] = "pkt",
> > > > + [PTR_TO_PACKET_META] = "pkt_meta",
> > > > + [PTR_TO_PACKET_END] = "pkt_end",
> > > > + [PTR_TO_FLOW_KEYS] = "flow_keys",
> > > > + [PTR_TO_SOCKET] = "sock",
> > > > + [PTR_TO_SOCK_COMMON] = "sock_common",
> > > > + [PTR_TO_TCP_SOCK] = "tcp_sock",
> > > > + [PTR_TO_TP_BUFFER] = "tp_buffer",
> > > > + [PTR_TO_XDP_SOCK] = "xdp_sock",
> > > > + [PTR_TO_BTF_ID] = "ptr_",
> > > > + [PTR_TO_PERCPU_BTF_ID] = "percpu_ptr_",
> > > > + [PTR_TO_MEM] = "mem",
> > > > + [PTR_TO_RDONLY_BUF] = "rdonly_buf",
> > > > + [PTR_TO_RDWR_BUF] = "rdwr_buf",
> > > > + [PTR_TO_FUNC] = "func",
> > > > + [PTR_TO_MAP_KEY] = "map_key",
> > > > + };
> > > > +
> > > > + return str[base_type(type)];
> > >
> > > well... now we lose the "_or_null" part, that can be pretty important.
> > > Same will happen with RDONLY flag, right?
> > >
> > > What can we do about that?
> > >
> >
> > We can format the string into a global buffer and return the buffer to
> > the caller. A little overhead on string formatting.
>
> Can't use global buffer, because multiple BPF verifications can
> proceed at the same time.
I think reg_type_str() can still return a const char string
with flags.
It's not going to be a direct str[base_type(type)]; of course.
The str[] would be different.
If that doesn't work out we can try:
s/verbose(,"%s", reg_type_str[])
/verbose(, "%s%s", reg_type_str(), reg_type_flags_str())
next prev parent reply other threads:[~2021-12-09 21:45 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 23:22 [PATCH bpf-next v1 0/9] Introduce composable bpf types Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 1/9] bpf: Introduce composable reg, ret and arg types Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 2/9] bpf: Replace ARG_XXX_OR_NULL with ARG_XXX | PTR_MAYBE_NULL Hao Luo
2021-12-07 5:45 ` Andrii Nakryiko
2021-12-07 18:52 ` Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 3/9] bpf: Replace RET_XXX_OR_NULL with RET_XXX " Hao Luo
2021-12-07 5:51 ` Andrii Nakryiko
2021-12-07 19:05 ` Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 4/9] bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX " Hao Luo
2021-12-07 6:08 ` Andrii Nakryiko
2021-12-08 3:37 ` Hao Luo
2021-12-08 20:03 ` Andrii Nakryiko
2021-12-09 21:45 ` Alexei Starovoitov [this message]
2021-12-10 19:56 ` Hao Luo
2021-12-13 1:51 ` Alexei Starovoitov
2021-12-13 2:02 ` Alexei Starovoitov
2021-12-17 0:32 ` Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 5/9] bpf: Introduce MEM_RDONLY flag Hao Luo
2021-12-07 6:14 ` Andrii Nakryiko
2021-12-08 3:41 ` Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 6/9] bpf: Convert PTR_TO_MEM_OR_NULL to composable types Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 7/9] bpf: Make per_cpu_ptr return rdonly PTR_TO_MEM Hao Luo
2021-12-07 6:18 ` Andrii Nakryiko
2021-12-08 3:54 ` Hao Luo
2021-12-10 17:42 ` Andrii Nakryiko
2021-12-10 18:36 ` Hao Luo
2021-12-06 23:22 ` [PATCH bpf-next v1 8/9] bpf: Add MEM_RDONLY for helper args that are pointers to rdonly mem Hao Luo
2021-12-07 6:23 ` Andrii Nakryiko
2021-12-08 3:49 ` Hao Luo
2021-12-09 20:04 ` Hao Luo
2021-12-10 17:55 ` Andrii Nakryiko
2021-12-06 23:22 ` [PATCH bpf-next v1 9/9] bpf/selftests: Test PTR_TO_RDONLY_MEM Hao Luo
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