netdev - Re: [PATCH v3 bpf-next 3/8] bpf: Remember BTF of inner maps.

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Message-ID: <71642ba2-5fe9-70e4-69c2-bc2baaec5687@fb.com>
Date:   Mon, 28 Jun 2021 18:45:39 -0700
From:   Yonghong Song <yhs@...com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        <davem@...emloft.net>
CC:     <daniel@...earbox.net>, <andrii@...nel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <kernel-team@...com>
Subject: Re: [PATCH v3 bpf-next 3/8] bpf: Remember BTF of inner maps.



On 6/23/21 7:25 PM, Alexei Starovoitov wrote:
> From: Alexei Starovoitov <ast@...nel.org>
> 
> BTF is required for 'struct bpf_timer' to be recognized inside map value.
> The bpf timers are supported inside inner maps.
> Remember 'struct btf *' in inner_map_meta to make it available
> to the verifier in the sequence:
> 
> struct bpf_map *inner_map = bpf_map_lookup_elem(&outer_map, ...);
> if (inner_map)
>      timer = bpf_map_lookup_elem(&inner_map, ...);
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: Yonghong Song <yhs@...com>