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Date: Thu, 26 Oct 2017 21:54:56 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>,
Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH v2 net-next 01/15] tcp: Namespace-ify sysctl_tcp_early_retrans
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
include/net/netns/ipv4.h | 1 +
include/net/tcp.h | 1 -
net/ipv4/sysctl_net_ipv4.c | 18 +++++++++---------
net/ipv4/tcp_input.c | 1 -
net/ipv4/tcp_ipv4.c | 1 +
net/ipv4/tcp_output.c | 4 +++-
6 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 2c4222a5d1025f5928665e10edb70fad65352dba..a7f39e3ea666a835b6042e4008c86ccaadd14b46 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -128,6 +128,7 @@ struct netns_ipv4 {
int sysctl_tcp_sack;
int sysctl_tcp_window_scaling;
int sysctl_tcp_timestamps;
+ int sysctl_tcp_early_retrans;
struct inet_timewait_death_row tcp_death_row;
int sysctl_max_syn_backlog;
int sysctl_tcp_fastopen;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 285bc82dea410b22ac585ee65daff5cbac7c3fc7..a12b71d4118baa6b939bdeba7380cb3830d46ff0 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -265,7 +265,6 @@ extern int sysctl_tcp_workaround_signed_windows;
extern int sysctl_tcp_slow_start_after_idle;
extern int sysctl_tcp_thin_linear_timeouts;
extern int sysctl_tcp_thin_dupack;
-extern int sysctl_tcp_early_retrans;
extern int sysctl_tcp_recovery;
#define TCP_RACK_LOSS_DETECTION 0x1 /* Use RACK to detect losses */
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 81d218346cf7a0f340f964c434a21cace5c41fa0..f0f650f020afd535f41943c6c9fb1483be7cfb8d 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -634,15 +634,6 @@ static struct ctl_table ipv4_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
- {
- .procname = "tcp_early_retrans",
- .data = &sysctl_tcp_early_retrans,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &zero,
- .extra2 = &four,
- },
{
.procname = "tcp_min_tso_segs",
.data = &sysctl_tcp_min_tso_segs,
@@ -1145,6 +1136,15 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec
},
+ {
+ .procname = "tcp_early_retrans",
+ .data = &init_net.ipv4.sysctl_tcp_early_retrans,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &four,
+ },
{ }
};
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 337f6011528a7d4c3ab7fdcc0623496cfefafc71..7656b1e6d5046297b4c5e6cf5591266b9be40095 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -95,7 +95,6 @@ int sysctl_tcp_max_orphans __read_mostly = NR_FILE;
int sysctl_tcp_frto __read_mostly = 2;
int sysctl_tcp_min_rtt_wlen __read_mostly = 300;
int sysctl_tcp_moderate_rcvbuf __read_mostly = 1;
-int sysctl_tcp_early_retrans __read_mostly = 3;
int sysctl_tcp_invalid_ratelimit __read_mostly = HZ/2;
#define FLAG_DATA 0x01 /* Incoming frame contained data. */
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 23a8100af5ad399d4fa2568f4cac19192a008055..7ab313f6768e234173d78f17cfb1f664b230e958 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2484,6 +2484,7 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_sack = 1;
net->ipv4.sysctl_tcp_window_scaling = 1;
net->ipv4.sysctl_tcp_timestamps = 1;
+ net->ipv4.sysctl_tcp_early_retrans = 3;
net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index c8fc512e0bbb48f7d36e159e8aae56ec70a24498..21713836d46af9d48de10e8ec0e7410572ed7eeb 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2435,6 +2435,7 @@ bool tcp_schedule_loss_probe(struct sock *sk)
struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
u32 timeout, rto_delta_us;
+ int early_retrans;
/* Don't do any loss probe on a Fast Open connection before 3WHS
* finishes.
@@ -2442,10 +2443,11 @@ bool tcp_schedule_loss_probe(struct sock *sk)
if (tp->fastopen_rsk)
return false;
+ early_retrans = sock_net(sk)->ipv4.sysctl_tcp_early_retrans;
/* Schedule a loss probe in 2*RTT for SACK capable connections
* in Open state, that are either limited by cwnd or application.
*/
- if ((sysctl_tcp_early_retrans != 3 && sysctl_tcp_early_retrans != 4) ||
+ if ((early_retrans != 3 && early_retrans != 4) ||
!tp->packets_out || !tcp_is_sack(tp) ||
icsk->icsk_ca_state != TCP_CA_Open)
return false;
--
2.15.0.rc2.357.g7e34df9404-goog
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