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Date: Tue, 03 Jun 2014 13:23:10 -0400
From: Vlad Yasevich <vyasevich@...il.com>
To: raffaello@....abdn.ac.uk
CC: netdev@...r.kernel.org
Subject: Re: [PATCH RFC] new-CWV for Linux
On 06/03/2014 11:46 AM, raffaello@....abdn.ac.uk wrote:
> Thanks Neal for the hints on how to send from git.
>
> Please consider this corrected patch for new-CWV.
>
> Raffaello
>
>
> ---
> include/linux/tcp.h | 13 +++++++++++++
> include/net/tcp.h | 14 +++++++++++++-
> net/ipv4/Makefile | 2 +-
> net/ipv4/sysctl_net_ipv4.c | 7 +++++++
> net/ipv4/tcp_cong.c | 13 ++++++++++---
> net/ipv4/tcp_input.c | 20 ++++++++++++++++++++
> net/ipv4/tcp_output.c | 3 +++
> 7 files changed, 67 insertions(+), 5 deletions(-)
I think you forgot to do
# git-add tcp_newcwv.c
-vlad
>
> Signed-off-by: Raffaello Secchi <raffaello@....abdn.ac.uk>
> Reviewed-by: Tom Jones <tom@....abdn.ac.uk>
> diff --git a/include/linux/tcp.h b/include/linux/tcp.h
> index 2399468..fb82343 100644
> --- a/include/linux/tcp.h
> +++ b/include/linux/tcp.h
> @@ -323,6 +323,19 @@ struct tcp_sock {
> * socket. Used to retransmit SYNACKs etc.
> */
> struct request_sock *fastopen_rsk;
> +
> +/* TCP newcwv related information */
> + u32 psample[4]; /* pipeACK samples circular buffer */
> + u32 time_stamp[4];
> + u32 head; /* index for psample buffer */
> +
> + u32 pipeack; /* pipeACK value after filtering */
> + u32 loss_flight_size; /* flightsize at loss detection */
> + u32 prior_retrans; /* Retransmission before going into FR */
> + u32 prev_snd_una; /* snd_una of last record */
> + u32 prev_snd_nxt; /* snd_nxt of last record */
> + u32 cwnd_valid_ts; /* last time cwnd was found valid */
> +
> };
>
> enum tsq_flags {
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 87d8774..6d71de5 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -235,6 +235,10 @@ void tcp_time_wait(struct sock *sk, int state, int timeo);
> */
> #define TFO_SERVER_ALWAYS 0x1000
>
> +/* NewCWV defaults */
> +#define NCWV_UNDEF 0xFFFFFFFF
> +#define NCWV_FIVEMIN (HZ*300)
> +
> extern struct inet_timewait_death_row tcp_death_row;
>
> /* sysctl variables for tcp */
> @@ -284,6 +288,7 @@ extern int sysctl_tcp_challenge_ack_limit;
> extern unsigned int sysctl_tcp_notsent_lowat;
> extern int sysctl_tcp_min_tso_segs;
> extern int sysctl_tcp_autocorking;
> +extern int sysctl_tcp_newcwv;
>
> extern atomic_long_t tcp_memory_allocated;
> extern struct percpu_counter tcp_sockets_allocated;
> @@ -975,7 +980,7 @@ static inline u32 tcp_wnd_end(const struct tcp_sock *tp)
> {
> return tp->snd_una + tp->snd_wnd;
> }
> -bool tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight);
> +bool tcp_is_cwnd_limited(struct sock *sk, u32 in_flight);
>
> static inline void tcp_check_probe_timer(struct sock *sk)
> {
> @@ -1324,6 +1329,13 @@ struct tcp_fastopen_context {
> struct rcu_head rcu;
> };
>
> +/* TCP New CWV functions */
> +void tcp_newcwv_update_pipeack(struct sock *sk);
> +void tcp_newcwv_datalim_closedown(struct sock *sk);
> +void tcp_newcwv_enter_recovery(struct sock *sk);
> +void tcp_newcwv_end_recovery(struct sock *sk);
> +void tcp_newcwv_reset(struct sock *sk);
> +
> /* write queue abstraction */
> static inline void tcp_write_queue_purge(struct sock *sk)
> {
> diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
> index f032688..f687746 100644
> --- a/net/ipv4/Makefile
> +++ b/net/ipv4/Makefile
> @@ -10,7 +10,7 @@ obj-y := route.o inetpeer.o protocol.o \
> tcp_minisocks.o tcp_cong.o tcp_metrics.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 \
> + fib_frontend.o fib_semantics.o fib_trie.o tcp_newcwv.o \
> inet_fragment.o ping.o ip_tunnel_core.o gre_offload.o
>
> obj-$(CONFIG_NET_IP_TUNNEL) += ip_tunnel.o
> diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
> index 5cde8f2..bfdf30e 100644
> --- a/net/ipv4/sysctl_net_ipv4.c
> +++ b/net/ipv4/sysctl_net_ipv4.c
> @@ -493,6 +493,13 @@ static struct ctl_table ipv4_table[] = {
> .proc_handler = proc_dointvec
> },
> {
> + .procname = "tcp_newcwv",
> + .data = &sysctl_tcp_newcwv,
> + .maxlen = sizeof(int),
> + .mode = 0644,
> + .proc_handler = proc_dointvec
> + },
> + {
> .procname = "tcp_reordering",
> .data = &sysctl_tcp_reordering,
> .maxlen = sizeof(int),
> diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
> index 2b9464c..6fb0719 100644
> --- a/net/ipv4/tcp_cong.c
> +++ b/net/ipv4/tcp_cong.c
> @@ -93,6 +93,9 @@ void tcp_init_congestion_control(struct sock *sk)
> rcu_read_unlock();
> }
>
> + /* draft-ietf-tcpm-newcwv initial state */
> + tcp_newcwv_reset(sk);
> +
> if (icsk->icsk_ca_ops->init)
> icsk->icsk_ca_ops->init(sk);
> }
> @@ -279,13 +282,17 @@ int tcp_set_congestion_control(struct sock *sk, const char *name)
> /* RFC2861 Check whether we are limited by application or congestion window
> * This is the inverse of cwnd check in tcp_tso_should_defer
> */
> -bool tcp_is_cwnd_limited(const struct sock *sk, u32 in_flight)
> +bool tcp_is_cwnd_limited(struct sock *sk, u32 in_flight)
> {
> - const struct tcp_sock *tp = tcp_sk(sk);
> + struct tcp_sock *tp = tcp_sk(sk);
> u32 left;
>
> - if (in_flight >= tp->snd_cwnd)
> + /* draft-ietf-tcpm-newcwv relaxes conditions for growing cwnd */
> + if (in_flight >= tp->snd_cwnd || (sysctl_tcp_newcwv &&
> + tp->pipeack >= (tp->snd_cwnd*tp->mss_cache >> 1))) {
> + tp->cwnd_valid_ts = tcp_time_stamp;
> return true;
> + }
>
> left = tp->snd_cwnd - in_flight;
> if (sk_can_gso(sk) &&
> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
> index 3a26b3b..f2d855e 100644
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -1927,6 +1927,7 @@ void tcp_enter_loss(struct sock *sk, int how)
> tp->snd_cwnd = 1;
> tp->snd_cwnd_cnt = 0;
> tp->snd_cwnd_stamp = tcp_time_stamp;
> + tcp_newcwv_reset(sk);
>
> tcp_clear_retrans_partial(tp);
>
> @@ -2522,7 +2523,16 @@ static inline void tcp_end_cwnd_reduction(struct sock *sk)
> (tp->undo_marker && tp->snd_ssthresh < TCP_INFINITE_SSTHRESH)) {
> tp->snd_cwnd = tp->snd_ssthresh;
> tp->snd_cwnd_stamp = tcp_time_stamp;
> +
> + /* draft-ietf-tcpm-newcwv actions at the end of recovery */
> + if (sysctl_tcp_newcwv) {
> + if (tp->loss_flight_size)
> + tcp_newcwv_end_recovery(sk);
> + tcp_newcwv_reset(sk);
> + }
> }
> + tp->loss_flight_size = 0;
> +
> tcp_ca_event(sk, CA_EVENT_COMPLETE_CWR);
> }
>
> @@ -2666,6 +2676,11 @@ static void tcp_enter_recovery(struct sock *sk, bool ece_ack)
> tp->undo_marker = tp->snd_una;
> tp->undo_retrans = tp->retrans_out;
>
> + /* draft-ietf-tcpm-newcwv reduction at start of recovery */
> + if (sysctl_tcp_newcwv &&
> + tp->pipeack <= (tp->snd_cwnd*tp->mss_cache >> 1))
> + tcp_newcwv_enter_recovery(sk);
> +
> if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) {
> if (!ece_ack)
> tp->prior_ssthresh = tcp_current_ssthresh(sk);
> @@ -3449,6 +3464,11 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
> sack_rtt_us);
> acked -= tp->packets_out;
>
> + /* draft-ietf-tcpm-newcwv pipeack estimation */
> + if (sysctl_tcp_newcwv && icsk->icsk_ca_state <= TCP_CA_Disorder
> + && (flag & FLAG_DATA_ACKED))
> + tcp_newcwv_update_pipeack(sk);
> +
> /* Advance cwnd if state allows */
> if (tcp_may_raise_cwnd(sk, flag))
> tcp_cong_avoid(sk, ack, acked, prior_in_flight);
> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 12d6016..e868211 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -168,6 +168,9 @@ static void tcp_event_data_sent(struct tcp_sock *tp,
> const u32 now = tcp_time_stamp;
> const struct dst_entry *dst = __sk_dst_get(sk);
>
> + if (sysctl_tcp_newcwv)
> + tcp_newcwv_datalim_closedown(sk);
> +
> if (sysctl_tcp_slow_start_after_idle &&
> (!tp->packets_out && (s32)(now - tp->lsndtime) > icsk->icsk_rto))
> tcp_cwnd_restart(sk, __sk_dst_get(sk));
>
--
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