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Date: Mon, 5 May 2014 16:18:05 -0700
From: Yuchung Cheng <ycheng@...gle.com>
To: Andi Kleen <andi@...stfloor.org>
Cc: netdev <netdev@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
tom.zanussi@...ux.intel.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 08/24] net, diet: Make TCP metrics optional
On Mon, May 5, 2014 at 3:25 PM, Andi Kleen <andi@...stfloor.org> wrote:
> From: Andi Kleen <ak@...ux.intel.com>
>
> This is all the code that saves connection information
> between different sockets. Not really essential for
> small systems.
>
> Saves about 5.5k text
>
> text data bss dec hex filename
> 492952 19571 13480 526003 806b3 net/built-in.o-with-metrics
> 487675 19275 13480 520430 7f0ee net/built-in.o-without-metrics
>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
> include/net/tcp.h | 25 +++++++++++++++++++++++++
> net/ipv4/Kconfig | 6 ++++++
> net/ipv4/Makefile | 3 ++-
> net/ipv4/sysctl_net_ipv4.c | 2 ++
> 4 files changed, 35 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 87d8774..d741d2f 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -419,14 +419,29 @@ int tcp_child_process(struct sock *parent, struct sock *child,
> struct sk_buff *skb);
> void tcp_enter_loss(struct sock *sk, int how);
> void tcp_clear_retrans(struct tcp_sock *tp);
> +#ifdef CONFIG_TCP_METRICS
> void tcp_update_metrics(struct sock *sk);
> void tcp_init_metrics(struct sock *sk);
> void tcp_metrics_init(void);
> +
> bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst,
> bool paws_check);
> bool tcp_remember_stamp(struct sock *sk);
> bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw);
> void tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst);
> +#else
> +static inline void tcp_update_metrics(struct sock *sk) {}
> +static inline void tcp_init_metrics(struct sock *sk) {}
> +static inline void tcp_metrics_init(void) {}
> +static inline bool tcp_peer_is_proven(struct request_sock *req,
> + struct dst_entry *dst,
> + bool paws_check) { return false; }
> +static inline bool tcp_remember_stamp(struct sock *sk) { return false; }
> +static inline bool
> +tcp_tw_remember_stamp(struct inet_timewait_sock *tw) { return false; }
> +static inline void
> +tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst) {}
> +#endif
> void tcp_disable_fack(struct tcp_sock *tp);
> void tcp_close(struct sock *sk, long timeout);
> void tcp_init_sock(struct sock *sk);
> @@ -1296,11 +1311,21 @@ int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
> const struct tcp_md5sig_key *key);
>
> /* From tcp_fastopen.c */
> +#ifdef CONFIG_TCP_METRICS
> void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
> struct tcp_fastopen_cookie *cookie, int *syn_loss,
> unsigned long *last_syn_loss);
> void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
> struct tcp_fastopen_cookie *cookie, bool syn_lost);
> +#else
> +static inline void
> +tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
> + struct tcp_fastopen_cookie *cookie, int *syn_loss,
> + unsigned long *last_syn_loss) {}
> +static inline void
> +tcp_fastopen_cache_set(struct sock *sk, u16 mss,
> + struct tcp_fastopen_cookie *cookie, bool syn_lost) {}
> +#endif
> struct tcp_fastopen_request {
> /* Fast Open cookie. Size 0 means a cookie request */
> struct tcp_fastopen_cookie cookie;
> diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
> index 6146b1b..db2dada 100644
> --- a/net/ipv4/Kconfig
> +++ b/net/ipv4/Kconfig
> @@ -264,6 +264,12 @@ config IP_PIMSM_V2
> gated-5). This routing protocol is not used widely, so say N unless
> you want to play with it.
>
> +config TCP_METRICS
> + bool "Report TCP metrics over netlink"
> + ---help---
> + Enable support in TCP to save host information between different
> + connections.
Please add that "Certain TCP features such as active TCP Fast Open
depends on this."
> +
> config SYN_COOKIES
> bool "IP: TCP syncookie support"
> ---help---
> diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
> index 756855c..8b17b83 100644
> --- a/net/ipv4/Makefile
> +++ b/net/ipv4/Makefile
> @@ -7,7 +7,7 @@ obj-y := route.o inetpeer.o protocol.o \
> ip_output.o ip_sockglue.o inet_hashtables.o \
> inet_timewait_sock.o inet_connection_sock.o \
> tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \
> - tcp_minisocks.o tcp_cong.o tcp_metrics.o tcp_fastopen.o \
> + tcp_minisocks.o tcp_cong.o tcp_fastopen.o \
> tcp_offload.o datagram.o raw.o udp.o udplite.o \
> udp_offload.o arp.o icmp.o devinet.o af_inet.o igmp.o \
> fib_frontend.o fib_semantics.o fib_trie.o \
> @@ -17,6 +17,7 @@ obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
> obj-$(CONFIG_IP_PING) += ping.o
> obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
> obj-$(CONFIG_PROC_FS) += proc.o
> +obj-$(CONFIG_TCP_METRICS) += tcp_metrics.o
> obj-$(CONFIG_IP_MULTIPLE_TABLES) += fib_rules.o
> obj-$(CONFIG_IP_MROUTE) += ipmr.o
> obj-$(CONFIG_NET_IPIP) += ipip.o
> diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
> index 44eba05..2110d2e 100644
> --- a/net/ipv4/sysctl_net_ipv4.c
> +++ b/net/ipv4/sysctl_net_ipv4.c
> @@ -573,6 +573,7 @@ static struct ctl_table ipv4_table[] = {
> .mode = 0644,
> .proc_handler = proc_dointvec
> },
> +#ifdef CONFIG_TCP_METRICS
> {
> .procname = "tcp_no_metrics_save",
> .data = &sysctl_tcp_nometrics_save,
> @@ -580,6 +581,7 @@ static struct ctl_table ipv4_table[] = {
> .mode = 0644,
> .proc_handler = proc_dointvec,
> },
> +#endif
> {
> .procname = "tcp_moderate_rcvbuf",
> .data = &sysctl_tcp_moderate_rcvbuf,
> --
> 1.9.0
>
> --
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