netdev - Re: [PATCH bpf-next 1/3] bpf: pass struct btf pointer to the map_check

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Message-ID: <20181209020612.raa636zl3x4sola2@kafai-mbp.dhcp.thefacebook.com>
Date:   Sun, 9 Dec 2018 02:06:14 +0000
From:   Martin Lau <kafai@...com>
To:     Roman Gushchin <guroan@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Roman Gushchin <guro@...com>,
        "Alexei Starovoitov" <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next 1/3] bpf: pass struct btf pointer to the
 map_check_btf() callback

On Fri, Dec 07, 2018 at 04:53:13PM -0800, Roman Gushchin wrote:
> If key_type or value_type are of non-trivial data types
> (e.g. structure or typedef), it's not possible to check them without
> the additional information, which can't be obtained without a pointer
> to the btf structure.
> 
> So, let's pass btf pointer to the map_check_btf() callbacks.
Acked-by: Martin KaFai Lau <kafai@...com>