On Fri, Feb 19, 2021 at 10:25 AM Jakub Sitnicki <jakub@xxxxxxxxxxxxxx> wrote:
>
> On Tue, Feb 16, 2021 at 07:42 AM CET, Cong Wang wrote:
> > From: Cong Wang <cong.wang@xxxxxxxxxxxxx>
> >
> > As suggested by John, clean up sockmap related Kconfigs:
> >
> > Reduce the scope of CONFIG_BPF_STREAM_PARSER down to TCP stream
> > parser, to reflect its name.
> >
> > Make the rest sockmap code simply depend on CONFIG_BPF_SYSCALL.
> > And leave CONFIG_NET_SOCK_MSG untouched, as it is used by
> > non-sockmap cases.
> >
> > Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> > Cc: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
> > Reviewed-by: Lorenz Bauer <lmb@xxxxxxxxxxxxxx>
> > Acked-by: John Fastabend <john.fastabend@xxxxxxxxx>
> > Signed-off-by: Cong Wang <cong.wang@xxxxxxxxxxxxx>
> > ---
>
> Sorry for the delay. There's a lot happening here. Took me a while to
> dig through it.
>
> I have a couple of nit-picks, which easily can be addressed as
> follow-ups, and one comment.
No problem, it is not merged, so V5 is definitely not a problem.
>
> sock_map_prog_update and sk_psock_done_strp are only used in
> net/core/sock_map.c and can be static.
1. This seems to be unrelated to this patch? But I am still happy to
address it.
2. sk_psock_done_strp() is in skmsg.c, hence why it is non-static.
And I believe it fits in skmsg.c better than in sock_map.c, because
it operates on psock rather than sock_map itself.
So, I can make sock_map_prog_update() static in a separate patch
and carry it in V5.
>
> [...]
>
> > diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
> > index bc7d2a586e18..b2c4865eb39b 100644
> > --- a/net/ipv4/tcp_bpf.c
> > +++ b/net/ipv4/tcp_bpf.c
> > @@ -229,7 +229,6 @@ int tcp_bpf_sendmsg_redir(struct sock *sk, struct sk_msg *msg,
> > }
> > EXPORT_SYMBOL_GPL(tcp_bpf_sendmsg_redir);
> >
> > -#ifdef CONFIG_BPF_STREAM_PARSER
> > static bool tcp_bpf_stream_read(const struct sock *sk)
> > {
> > struct sk_psock *psock;
> > @@ -561,8 +560,10 @@ static void tcp_bpf_rebuild_protos(struct proto prot[TCP_BPF_NUM_CFGS],
> > struct proto *base)
> > {
> > prot[TCP_BPF_BASE] = *base;
> > +#if defined(CONFIG_BPF_SYSCALL)
> > prot[TCP_BPF_BASE].unhash = sock_map_unhash;
> > prot[TCP_BPF_BASE].close = sock_map_close;
> > +#endif
> > prot[TCP_BPF_BASE].recvmsg = tcp_bpf_recvmsg;
> > prot[TCP_BPF_BASE].stream_memory_read = tcp_bpf_stream_read;
> >
> > @@ -629,4 +630,3 @@ void tcp_bpf_clone(const struct sock *sk, struct sock *newsk)
> > if (prot == &tcp_bpf_prots[family][TCP_BPF_BASE])
> > newsk->sk_prot = sk->sk_prot_creator;
> > }
> > -#endif /* CONFIG_BPF_STREAM_PARSER */
>
> net/core/sock_map.o now is built only when CONFIG_BPF_SYSCALL is set.
> While tcp_bpf_get_proto is only called from net/core/sock_map.o.
>
> Seems there is no sense in compiling tcp_bpf_get_proto, and everything
> it depends on which was enclosed by CONFIG_BPF_STREAM_PARSER check, when
> CONFIG_BPF_SYSCALL is unset.
I can try but I am definitely not sure whether kTLS is happy about
it, clearly kTLS at least uses __tcp_bpf_recvmsg() and
tcp_bpf_sendmsg_redir().
>
> > diff --git a/net/ipv4/udp_bpf.c b/net/ipv4/udp_bpf.c
> > index 7a94791efc1a..e635ccc175ca 100644
> > --- a/net/ipv4/udp_bpf.c
> > +++ b/net/ipv4/udp_bpf.c
> > @@ -18,8 +18,10 @@ static struct proto udp_bpf_prots[UDP_BPF_NUM_PROTS];
> > static void udp_bpf_rebuild_protos(struct proto *prot, const struct proto *base)
> > {
> > *prot = *base;
> > +#if defined(CONFIG_BPF_SYSCALL)
> > prot->unhash = sock_map_unhash;
> > prot->close = sock_map_close;
> > +#endif
> > }
> >
> > static void udp_bpf_check_v6_needs_rebuild(struct proto *ops)
>
> Same situation here but for udp_bpf_get_proto.
UDP is different, as kTLS certainly doesn't and won't use it. I think
udp_bpf.c can be just put under CONFIG_BPF_SYSCALL.
Thanks.
