[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@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

14 files changed, 24 insertions, 28 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index a8af9ae00177..8b404b1ef7c8 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -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_sock *tp);
 
 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;
 
diff --git a/net/ipv4/tcp_bic.c b/net/ipv4/tcp_bic.c
index dd9ef65ad3ff..519de091a94d 100644
--- a/net/ipv4/tcp_bic.c
+++ b/net/ipv4/tcp_bic.c
@@ -137,7 +137,7 @@ static inline void bictcp_update(struct bictcp *ca, u32 cwnd)
 }
 
 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);
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 1260e52ad772..55fca1820c34 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -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);
 
diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c
index ebfaac2f9f46..d17da30d82d6 100644
--- a/net/ipv4/tcp_cubic.c
+++ b/net/ipv4/tcp_cubic.c
@@ -270,7 +270,7 @@ static inline void measure_delay(struct sock *sk)
 }
 
 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);
diff --git a/net/ipv4/tcp_highspeed.c b/net/ipv4/tcp_highspeed.c
index 43d624e5043c..14a073d8b60f 100644
--- a/net/ipv4/tcp_highspeed.c
+++ b/net/ipv4/tcp_highspeed.c
@@ -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);
diff --git a/net/ipv4/tcp_htcp.c b/net/ipv4/tcp_htcp.c
index 4ba4a7ae0a85..632c05a75883 100644
--- a/net/ipv4/tcp_htcp.c
+++ b/net/ipv4/tcp_htcp.c
@@ -225,7 +225,7 @@ static u32 htcp_recalc_ssthresh(struct sock *sk)
         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);
diff --git a/net/ipv4/tcp_hybla.c b/net/ipv4/tcp_hybla.c
index e5be35117223..b3e55cf56171 100644
--- a/net/ipv4/tcp_hybla.c
+++ b/net/ipv4/tcp_hybla.c
@@ -85,7 +85,7 @@ static inline u32 hybla_fraction(u32 odds)
  *     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 *sk, u32 ack, u32 rtt,
                 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);
diff --git a/net/ipv4/tcp_illinois.c b/net/ipv4/tcp_illinois.c
index b2b2256d3b84..cc5de6f69d46 100644
--- a/net/ipv4/tcp_illinois.c
+++ b/net/ipv4/tcp_illinois.c
@@ -258,7 +258,7 @@ static void tcp_illinois_state(struct sock *sk, u8 new_state)
 /*
  * 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);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4e5884ac8f29..fec8a7a4dbaf 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2323,11 +2323,11 @@ static inline void tcp_ack_update_rtt(struct sock *sk, const int flag,
                 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;
 }
 
@@ -2826,11 +2826,11 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
                 /* 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))
diff --git a/net/ipv4/tcp_lp.c b/net/ipv4/tcp_lp.c
index e49836ce012e..80e140e3ec2d 100644
--- a/net/ipv4/tcp_lp.c
+++ b/net/ipv4/tcp_lp.c
@@ -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);
 }
 
 /**
diff --git a/net/ipv4/tcp_scalable.c b/net/ipv4/tcp_scalable.c
index 4624501e9680..be27a33a1c68 100644
--- a/net/ipv4/tcp_scalable.c
+++ b/net/ipv4/tcp_scalable.c
@@ -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);
diff --git a/net/ipv4/tcp_vegas.c b/net/ipv4/tcp_vegas.c
index e218a51ceced..914e0307f7af 100644
--- a/net/ipv4/tcp_vegas.c
+++ b/net/ipv4/tcp_vegas.c
@@ -163,13 +163,13 @@ void tcp_vegas_cwnd_event(struct sock *sk, enum tcp_ca_event event)
 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 sock *sk, u32 ack,
                         /* 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;
 
diff --git a/net/ipv4/tcp_veno.c b/net/ipv4/tcp_veno.c
index ec854cc5fad5..7a55ddf86032 100644
--- a/net/ipv4/tcp_veno.c
+++ b/net/ipv4/tcp_veno.c
@@ -115,13 +115,13 @@ static void tcp_veno_cwnd_event(struct sock *sk, enum tcp_ca_event event)
 }
 
 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 sock *sk, u32 ack,
                 /* 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;
 
diff --git a/net/ipv4/tcp_yeah.c b/net/ipv4/tcp_yeah.c
index 545ed237ab53..c04b7c6ec702 100644
--- a/net/ipv4/tcp_yeah.c
+++ b/net/ipv4/tcp_yeah.c
@@ -70,7 +70,7 @@ static void tcp_yeah_pkts_acked(struct sock *sk, u32 pkts_acked, ktime_t last)
 }
 
 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);