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Date: Mon, 16 Jul 2007 16:19:51 +0100
From: Stephen Hemminger <shemminger@...ux-foundation.org>
To: "David S. Miller" <davem@...emloft.net>
Cc: <netdev@...r.kernel.org>
Subject: [PATCH] TCP: remove unused argument to cong_avoid op
None of the existing TCP congestion controls use the rtt value pased
in the ca_ops->cong_avoid interface. Which is lucky because seq_rtt
could have been -1 when handling a duplicate ack.
Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
--- a/include/net/tcp.h 2007-07-16 14:25:36.000000000 +0100
+++ b/include/net/tcp.h 2007-07-16 15:33:42.000000000 +0100
@@ -652,8 +652,7 @@ struct tcp_congestion_ops {
/* lower bound for congestion window (optional) */
u32 (*min_cwnd)(const struct sock *sk);
/* do new cwnd calculation (required) */
- void (*cong_avoid)(struct sock *sk, u32 ack,
- u32 rtt, u32 in_flight, int good_ack);
+ void (*cong_avoid)(struct sock *sk, u32 ack, u32 in_flight, int good_ack);
/* call before changing ca_state (optional) */
void (*set_state)(struct sock *sk, u8 new_state);
/* call when cwnd event occurs (optional) */
@@ -684,8 +683,7 @@ extern void tcp_slow_start(struct tcp_so
extern struct tcp_congestion_ops tcp_init_congestion_ops;
extern u32 tcp_reno_ssthresh(struct sock *sk);
-extern void tcp_reno_cong_avoid(struct sock *sk, u32 ack,
- u32 rtt, u32 in_flight, int flag);
+extern void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 in_flight, int flag);
extern u32 tcp_reno_min_cwnd(const struct sock *sk);
extern struct tcp_congestion_ops tcp_reno;
--- a/net/ipv4/tcp_bic.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_bic.c 2007-07-16 15:35:47.000000000 +0100
@@ -137,7 +137,7 @@ static inline void bictcp_update(struct
}
static void bictcp_cong_avoid(struct sock *sk, u32 ack,
- u32 seq_rtt, u32 in_flight, int data_acked)
+ u32 in_flight, int data_acked)
{
struct tcp_sock *tp = tcp_sk(sk);
struct bictcp *ca = inet_csk_ca(sk);
--- a/net/ipv4/tcp_cong.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_cong.c 2007-07-16 15:35:17.000000000 +0100
@@ -324,8 +324,7 @@ EXPORT_SYMBOL_GPL(tcp_slow_start);
/* This is Jacobson's slow start and congestion avoidance.
* SIGCOMM '88, p. 328.
*/
-void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 rtt, u32 in_flight,
- int flag)
+void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
--- a/net/ipv4/tcp_cubic.c 2007-07-16 15:18:34.000000000 +0100
+++ b/net/ipv4/tcp_cubic.c 2007-07-16 15:35:37.000000000 +0100
@@ -270,7 +270,7 @@ static inline void measure_delay(struct
}
static void bictcp_cong_avoid(struct sock *sk, u32 ack,
- u32 seq_rtt, u32 in_flight, int data_acked)
+ u32 in_flight, int data_acked)
{
struct tcp_sock *tp = tcp_sk(sk);
struct bictcp *ca = inet_csk_ca(sk);
--- a/net/ipv4/tcp_highspeed.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_highspeed.c 2007-07-16 15:36:08.000000000 +0100
@@ -109,7 +109,7 @@ static void hstcp_init(struct sock *sk)
tp->snd_cwnd_clamp = min_t(u32, tp->snd_cwnd_clamp, 0xffffffff/128);
}
-static void hstcp_cong_avoid(struct sock *sk, u32 adk, u32 rtt,
+static void hstcp_cong_avoid(struct sock *sk, u32 adk,
u32 in_flight, int data_acked)
{
struct tcp_sock *tp = tcp_sk(sk);
--- a/net/ipv4/tcp_htcp.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_htcp.c 2007-07-16 15:22:28.000000000 +0100
@@ -225,7 +225,7 @@ static u32 htcp_recalc_ssthresh(struct s
return max((tp->snd_cwnd * ca->beta) >> 7, 2U);
}
-static void htcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
+static void htcp_cong_avoid(struct sock *sk, u32 ack, s32 rtt,
u32 in_flight, int data_acked)
{
struct tcp_sock *tp = tcp_sk(sk);
--- a/net/ipv4/tcp_hybla.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_hybla.c 2007-07-16 15:38:15.000000000 +0100
@@ -85,7 +85,7 @@ static inline u32 hybla_fraction(u32 odd
* o Give cwnd a new value based on the model proposed
* o remember increments <1
*/
-static void hybla_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
+static void hybla_cong_avoid(struct sock *sk, u32 ack,
u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -103,7 +103,7 @@ static void hybla_cong_avoid(struct sock
return;
if (!ca->hybla_en)
- return tcp_reno_cong_avoid(sk, ack, rtt, in_flight, flag);
+ return tcp_reno_cong_avoid(sk, ack, in_flight, flag);
if (ca->rho == 0)
hybla_recalc_param(sk);
--- a/net/ipv4/tcp_illinois.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_illinois.c 2007-07-16 15:35:59.000000000 +0100
@@ -258,7 +258,7 @@ static void tcp_illinois_state(struct so
/*
* Increase window in response to successful acknowledgment.
*/
-static void tcp_illinois_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
+static void tcp_illinois_cong_avoid(struct sock *sk, u32 ack,
u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
--- a/net/ipv4/tcp_input.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_input.c 2007-07-16 15:33:08.000000000 +0100
@@ -2321,11 +2321,11 @@ static inline void tcp_ack_update_rtt(st
tcp_ack_no_tstamp(sk, seq_rtt, flag);
}
-static void tcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
+static void tcp_cong_avoid(struct sock *sk, u32 ack,
u32 in_flight, int good)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
- icsk->icsk_ca_ops->cong_avoid(sk, ack, rtt, in_flight, good);
+ icsk->icsk_ca_ops->cong_avoid(sk, ack, in_flight, good);
tcp_sk(sk)->snd_cwnd_stamp = tcp_time_stamp;
}
@@ -2824,11 +2824,11 @@ static int tcp_ack(struct sock *sk, stru
/* Advance CWND, if state allows this. */
if ((flag & FLAG_DATA_ACKED) && !frto_cwnd &&
tcp_may_raise_cwnd(sk, flag))
- tcp_cong_avoid(sk, ack, seq_rtt, prior_in_flight, 0);
+ tcp_cong_avoid(sk, ack, prior_in_flight, 0);
tcp_fastretrans_alert(sk, prior_snd_una, prior_packets, flag);
} else {
if ((flag & FLAG_DATA_ACKED) && !frto_cwnd)
- tcp_cong_avoid(sk, ack, seq_rtt, prior_in_flight, 1);
+ tcp_cong_avoid(sk, ack, prior_in_flight, 1);
}
if ((flag & FLAG_FORWARD_PROGRESS) || !(flag&FLAG_NOT_DUP))
--- a/net/ipv4/tcp_lp.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_lp.c 2007-07-16 15:37:39.000000000 +0100
@@ -115,13 +115,12 @@ static void tcp_lp_init(struct sock *sk)
* Will only call newReno CA when away from inference.
* From TCP-LP's paper, this will be handled in additive increasement.
*/
-static void tcp_lp_cong_avoid(struct sock *sk, u32 ack, u32 rtt, u32 in_flight,
- int flag)
+static void tcp_lp_cong_avoid(struct sock *sk, u32 ack, u32 in_flight, int flag)
{
struct lp *lp = inet_csk_ca(sk);
if (!(lp->flag & LP_WITHIN_INF))
- tcp_reno_cong_avoid(sk, ack, rtt, in_flight, flag);
+ tcp_reno_cong_avoid(sk, ack, in_flight, flag);
}
/**
--- a/net/ipv4/tcp_scalable.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_scalable.c 2007-07-16 15:37:23.000000000 +0100
@@ -15,7 +15,7 @@
#define TCP_SCALABLE_AI_CNT 50U
#define TCP_SCALABLE_MD_SCALE 3
-static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
+static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack,
u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
--- a/net/ipv4/tcp_vegas.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_vegas.c 2007-07-16 15:36:44.000000000 +0100
@@ -163,13 +163,13 @@ void tcp_vegas_cwnd_event(struct sock *s
EXPORT_SYMBOL_GPL(tcp_vegas_cwnd_event);
static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack,
- u32 seq_rtt, u32 in_flight, int flag)
+ u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
struct vegas *vegas = inet_csk_ca(sk);
if (!vegas->doing_vegas_now)
- return tcp_reno_cong_avoid(sk, ack, seq_rtt, in_flight, flag);
+ return tcp_reno_cong_avoid(sk, ack, in_flight, flag);
/* The key players are v_beg_snd_una and v_beg_snd_nxt.
*
@@ -228,7 +228,7 @@ static void tcp_vegas_cong_avoid(struct
/* We don't have enough RTT samples to do the Vegas
* calculation, so we'll behave like Reno.
*/
- tcp_reno_cong_avoid(sk, ack, seq_rtt, in_flight, flag);
+ tcp_reno_cong_avoid(sk, ack, in_flight, flag);
} else {
u32 rtt, target_cwnd, diff;
--- a/net/ipv4/tcp_veno.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_veno.c 2007-07-16 15:37:06.000000000 +0100
@@ -115,13 +115,13 @@ static void tcp_veno_cwnd_event(struct s
}
static void tcp_veno_cong_avoid(struct sock *sk, u32 ack,
- u32 seq_rtt, u32 in_flight, int flag)
+ u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
struct veno *veno = inet_csk_ca(sk);
if (!veno->doing_veno_now)
- return tcp_reno_cong_avoid(sk, ack, seq_rtt, in_flight, flag);
+ return tcp_reno_cong_avoid(sk, ack, in_flight, flag);
/* limited by applications */
if (!tcp_is_cwnd_limited(sk, in_flight))
@@ -132,7 +132,7 @@ static void tcp_veno_cong_avoid(struct s
/* We don't have enough rtt samples to do the Veno
* calculation, so we'll behave like Reno.
*/
- tcp_reno_cong_avoid(sk, ack, seq_rtt, in_flight, flag);
+ tcp_reno_cong_avoid(sk, ack, in_flight, flag);
} else {
u32 rtt, target_cwnd;
--- a/net/ipv4/tcp_yeah.c 2007-07-16 14:25:41.000000000 +0100
+++ b/net/ipv4/tcp_yeah.c 2007-07-16 15:37:52.000000000 +0100
@@ -70,7 +70,7 @@ static void tcp_yeah_pkts_acked(struct s
}
static void tcp_yeah_cong_avoid(struct sock *sk, u32 ack,
- u32 seq_rtt, u32 in_flight, int flag)
+ u32 in_flight, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
struct yeah *yeah = inet_csk_ca(sk);
-
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