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From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Martin KaFai Lau <kafai@fb.com>, bpf <bpf@vger.kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Kernel Team <kernel-team@fb.com>,
	Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH bpf-next 0/3] bpf: Allow inner map with different max_entries
Date: Tue, 26 May 2020 10:47:18 -0700
Message-ID: <CAEf4BzagR04dQYvhCZOGq9Vt7SfGXjJNHhorw9MCNm9pH_xxHg@mail.gmail.com> (raw)
In-Reply-To: <20200521231618.x3s45pttduqijbjv@ast-mbp.dhcp.thefacebook.com>

On Thu, May 21, 2020 at 4:16 PM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
> On Thu, May 21, 2020 at 04:10:36PM -0700, Andrii Nakryiko wrote:
> > > > 4. Then for size check change, again, it's really much simpler and
> > > > cleaner just to have a special case in check in bpf_map_meta_equal for
> > > > cases where map size matters.
> > > It may be simpler but not necessary less fragile for future map type.
> > >
> > > I am OK for removing patch 1 and just check for a specific
> > > type in patch 2 but I think it is fragile for future map
> > > type IMO.
> >
> > Well, if we think that the good default needs to be to check size,
> > then similar to above, explicitly list stuff that *does not* follow
> > the default, i.e., maps that don't want max_elements verification. My
> > point still stands.
> I think consoldating map properties in bpf_types.h is much cleaner
> and less error prone.

Consolidation is good, but then we hopefully do it for all aspects of
maps that currently have ad-hoc checks spread across a lot of places.
Just looking at map_lookup_elem in syscall.c makes me wanna cry, for
example :) I'll reply on another thread where Daniel proposed putting
everything into ops, I like that better.

> I'd only like to tweak the macro in patch 1 to avoid explicit ", 0)".
> Can BPF_MAP_TYPE() macro stay as-is and additional macro introduced
> for maps with properties ? BPF_MAP_TYPE_FL() ?
> Or do some macro magic that the same macro can be used with 2 and 3 args?

      parent reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-21 19:17 Martin KaFai Lau
2020-05-21 19:17 ` [PATCH bpf-next 1/3] bpf: Clean up inner map type check Martin KaFai Lau
2020-05-21 19:18 ` [PATCH bpf-next 2/3] bpf: Relax the max_entries check for inner map Martin KaFai Lau
2020-05-21 19:18 ` [PATCH bpf-next 3/3] bpf: selftests: Add test for different inner map size Martin KaFai Lau
2020-05-21 22:39 ` [PATCH bpf-next 0/3] bpf: Allow inner map with different max_entries Andrii Nakryiko
2020-05-21 22:59   ` Martin KaFai Lau
2020-05-21 23:10     ` Andrii Nakryiko
2020-05-21 23:16       ` Alexei Starovoitov
2020-05-22  0:06         ` Martin KaFai Lau
2020-05-26 17:47         ` Andrii Nakryiko [this message]

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