netdev - Re: [PATCH bpf-next 2/7] bpf: add bpf_skc_to_mptcp_sock

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Date:   Mon, 25 Apr 2022 16:33:51 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Geliang Tang <geliang.tang@...e.com>, ast@...nel.org,
        andrii@...nel.org, mptcp@...ts.linux.dev,
        Nicolas Rybowski <nicolas.rybowski@...sares.net>,
        Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH bpf-next 2/7] bpf: add bpf_skc_to_mptcp_sock_proto

On 4/21/22 12:24 AM, Mat Martineau wrote:
[...]
> diff --git a/include/net/mptcp.h b/include/net/mptcp.h
> index 0a3b0fb04a3b..5b3a6f783182 100644
> --- a/include/net/mptcp.h
> +++ b/include/net/mptcp.h
> @@ -283,4 +283,10 @@ static inline int mptcpv6_init(void) { return 0; }
>   static inline void mptcpv6_handle_mapped(struct sock *sk, bool mapped) { }
>   #endif
>   
> +#if defined(CONFIG_MPTCP) && defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL)
> +struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
> +#else
> +static inline struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { return NULL; }
> +#endif
> +

Where is this relevant to JIT specifically?

Thanks,
Daniel