netdev - Re: [PATCH bpf-next v4 1/7] bpf: add bpf_skc_to_mptcp_sock

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Date:   Tue, 17 May 2022 10:00:46 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Geliang Tang <geliangtang@...il.com>
Cc:     Martin KaFai Lau <kafai@...com>,
        Geliang Tang <geliang.tang@...e.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        MPTCP Upstream <mptcp@...ts.linux.dev>,
        Nicolas Rybowski <nicolas.rybowski@...sares.net>,
        Matthieu Baerts <matthieu.baerts@...sares.net>
Subject: Re: [PATCH bpf-next v4 1/7] bpf: add bpf_skc_to_mptcp_sock_proto

On Mon, May 16, 2022 at 10:26 PM Geliang Tang <geliangtang@...il.com> wrote:
>
> Martin KaFai Lau <kafai@...com> 于2022年5月17日周二 09:07写道：
> >
> > On Fri, May 13, 2022 at 03:48:21PM -0700, Mat Martineau wrote:
> > [ ... ]
> >
> > > diff --git a/include/net/mptcp.h b/include/net/mptcp.h
> > > index 8b1afd6f5cc4..2ba09de955c7 100644
> > > --- a/include/net/mptcp.h
> > > +++ b/include/net/mptcp.h
> > > @@ -284,4 +284,10 @@ 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_SYSCALL)
> > > +struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk);
> > Can this be inline ?
>
> This function can't be inline since it uses struct mptcp_subflow_context.
>
> mptcp_subflow_context is defined in net/mptcp/protocol.h, and we don't
> want to export it to user space in net/mptcp/protocol.h.

The above function can be made static inline in a header file.
That doesn't automatically expose it to user space.