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Date: Mon, 14 Jul 2014 16:58:32 +0200
From: Christoph Paasch <christoph.paasch@...ouvain.be>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Yuchung Cheng <ycheng@...gle.com>
Subject: [PATCH net-next] tcp: Remove unnecessary arg from tcp_enter_cwr and tcp_init_cwnd_reduction
Since Yuchung's 9b44190dc11 (tcp: refactor F-RTO), tcp_enter_cwr is always
called with set_ssthresh = 1. Thus, we can remove this argument from
tcp_enter_cwr. Further, as we remove this one, tcp_init_cwnd_reduction
is then always called with set_ssthresh = true, and so we can get rid of
this argument as well.
Cc: Yuchung Cheng <ycheng@...gle.com>
Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
---
include/net/tcp.h | 2 +-
net/ipv4/tcp_input.c | 15 +++++++--------
net/ipv4/tcp_output.c | 2 +-
3 files changed, 9 insertions(+), 10 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index c9a75dbba0c7..0aeb2eb749dc 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -928,7 +928,7 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
/* Use define here intentionally to get WARN_ON location shown at the caller */
#define tcp_verify_left_out(tp) WARN_ON(tcp_left_out(tp) > tp->packets_out)
-void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
+void tcp_enter_cwr(struct sock *sk);
__u32 tcp_init_cwnd(const struct tcp_sock *tp, const struct dst_entry *dst);
/* The maximum number of MSS of available cwnd for which TSO defers
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index bb684967f7a7..2e16afba182c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2475,7 +2475,7 @@ static bool tcp_try_undo_loss(struct sock *sk, bool frto_undo)
* losses and/or application stalls), do not perform any further cwnd
* reductions, but instead slow start up to ssthresh.
*/
-static void tcp_init_cwnd_reduction(struct sock *sk, const bool set_ssthresh)
+static void tcp_init_cwnd_reduction(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
@@ -2485,8 +2485,7 @@ static void tcp_init_cwnd_reduction(struct sock *sk, const bool set_ssthresh)
tp->prior_cwnd = tp->snd_cwnd;
tp->prr_delivered = 0;
tp->prr_out = 0;
- if (set_ssthresh)
- tp->snd_ssthresh = inet_csk(sk)->icsk_ca_ops->ssthresh(sk);
+ tp->snd_ssthresh = inet_csk(sk)->icsk_ca_ops->ssthresh(sk);
TCP_ECN_queue_cwr(tp);
}
@@ -2528,14 +2527,14 @@ static inline void tcp_end_cwnd_reduction(struct sock *sk)
}
/* Enter CWR state. Disable cwnd undo since congestion is proven with ECN */
-void tcp_enter_cwr(struct sock *sk, const int set_ssthresh)
+void tcp_enter_cwr(struct sock *sk)
{
struct tcp_sock *tp = tcp_sk(sk);
tp->prior_ssthresh = 0;
if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) {
tp->undo_marker = 0;
- tcp_init_cwnd_reduction(sk, set_ssthresh);
+ tcp_init_cwnd_reduction(sk);
tcp_set_ca_state(sk, TCP_CA_CWR);
}
}
@@ -2564,7 +2563,7 @@ static void tcp_try_to_open(struct sock *sk, int flag, const int prior_unsacked)
tp->retrans_stamp = 0;
if (flag & FLAG_ECE)
- tcp_enter_cwr(sk, 1);
+ tcp_enter_cwr(sk);
if (inet_csk(sk)->icsk_ca_state != TCP_CA_CWR) {
tcp_try_keep_open(sk);
@@ -2670,7 +2669,7 @@ static void tcp_enter_recovery(struct sock *sk, bool ece_ack)
if (inet_csk(sk)->icsk_ca_state < TCP_CA_CWR) {
if (!ece_ack)
tp->prior_ssthresh = tcp_current_ssthresh(sk);
- tcp_init_cwnd_reduction(sk, true);
+ tcp_init_cwnd_reduction(sk);
}
tcp_set_ca_state(sk, TCP_CA_Recovery);
}
@@ -3346,7 +3345,7 @@ static void tcp_process_tlp_ack(struct sock *sk, u32 ack, int flag)
tp->tlp_high_seq = 0;
/* Don't reduce cwnd if DSACK arrives for TLP retrans. */
if (!(flag & FLAG_DSACKING_ACK)) {
- tcp_init_cwnd_reduction(sk, true);
+ tcp_init_cwnd_reduction(sk);
tcp_set_ca_state(sk, TCP_CA_CWR);
tcp_end_cwnd_reduction(sk);
tcp_try_keep_open(sk);
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index bcee13c4627c..306dd5dead7d 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -979,7 +979,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
if (likely(err <= 0))
return err;
- tcp_enter_cwr(sk, 1);
+ tcp_enter_cwr(sk);
return net_xmit_eval(err);
}
--
1.9.3
--
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