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tcp: Namespace-ify sysctl_tcp_slow_start_after_idle

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Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-10-26 21:54:59 -07:00 • committed by David S. Miller
parent 2c04ac8ae0
commit b510f0d23a
5 changed files with 11 additions and 13 deletions
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1
include/net/netns/ipv4.h
View file

@ -131,6 +131,7 @@ struct netns_ipv4 {
int sysctl_tcp_early_retrans; int sysctl_tcp_early_retrans;
int sysctl_tcp_recovery; int sysctl_tcp_recovery;
int sysctl_tcp_thin_linear_timeouts; int sysctl_tcp_thin_linear_timeouts;
int sysctl_tcp_slow_start_after_idle;
struct inet_timewait_death_row tcp_death_row; struct inet_timewait_death_row tcp_death_row;
int sysctl_max_syn_backlog; int sysctl_max_syn_backlog;
int sysctl_tcp_fastopen; int sysctl_tcp_fastopen;

3
include/net/tcp.h
View file

@ -262,7 +262,6 @@ extern int sysctl_tcp_nometrics_save;
extern int sysctl_tcp_moderate_rcvbuf; extern int sysctl_tcp_moderate_rcvbuf;
extern int sysctl_tcp_tso_win_divisor; extern int sysctl_tcp_tso_win_divisor;
extern int sysctl_tcp_workaround_signed_windows; extern int sysctl_tcp_workaround_signed_windows;
extern int sysctl_tcp_slow_start_after_idle;
#define TCP_RACK_LOSS_DETECTION 0x1 /* Use RACK to detect losses */ #define TCP_RACK_LOSS_DETECTION 0x1 /* Use RACK to detect losses */
@ -1308,7 +1307,7 @@ static inline void tcp_slow_start_after_idle_check(struct sock *sk)
struct tcp_sock *tp = tcp_sk(sk); struct tcp_sock *tp = tcp_sk(sk);
s32 delta; s32 delta;
if (!sysctl_tcp_slow_start_after_idle || tp->packets_out || if (!sock_net(sk)->ipv4.sysctl_tcp_slow_start_after_idle || tp->packets_out ||
ca_ops->cong_control) ca_ops->cong_control)
return; return;
delta = tcp_jiffies32 - tp->lsndtime; delta = tcp_jiffies32 - tp->lsndtime;

14
net/ipv4/sysctl_net_ipv4.c
View file

@ -571,13 +571,6 @@ static struct ctl_table ipv4_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_dointvec .proc_handler = proc_dointvec
}, },
{
.procname = "tcp_slow_start_after_idle",
.data = &sysctl_tcp_slow_start_after_idle,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
#ifdef CONFIG_NETLABEL #ifdef CONFIG_NETLABEL
{ {
.procname = "cipso_cache_enable", .procname = "cipso_cache_enable",
@ -1145,6 +1138,13 @@ static struct ctl_table ipv4_net_table[] = {
.mode = 0644, .mode = 0644,
.proc_handler = proc_dointvec .proc_handler = proc_dointvec
}, },
{
.procname = "tcp_slow_start_after_idle",
.data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
},
{ } { }
}; };

1
net/ipv4/tcp_ipv4.c
View file

@ -2486,6 +2486,7 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_timestamps = 1; net->ipv4.sysctl_tcp_timestamps = 1;
net->ipv4.sysctl_tcp_early_retrans = 3; net->ipv4.sysctl_tcp_early_retrans = 3;
net->ipv4.sysctl_tcp_recovery = TCP_RACK_LOSS_DETECTION; net->ipv4.sysctl_tcp_recovery = TCP_RACK_LOSS_DETECTION;
net->ipv4.sysctl_tcp_slow_start_after_idle = 1; /* By default, RFC2861 behavior. */
net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE; net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock); spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);

5
net/ipv4/tcp_output.c
View file

@ -62,9 +62,6 @@ int sysctl_tcp_limit_output_bytes __read_mostly = 262144;
*/ */
int sysctl_tcp_tso_win_divisor __read_mostly = 3; int sysctl_tcp_tso_win_divisor __read_mostly = 3;
/* By default, RFC2861 behavior. */
int sysctl_tcp_slow_start_after_idle __read_mostly = 1;
static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle, static bool tcp_write_xmit(struct sock *sk, unsigned int mss_now, int nonagle,
int push_one, gfp_t gfp); int push_one, gfp_t gfp);
@ -1690,7 +1687,7 @@ static void tcp_cwnd_validate(struct sock *sk, bool is_cwnd_limited)
if (tp->packets_out > tp->snd_cwnd_used) if (tp->packets_out > tp->snd_cwnd_used)
tp->snd_cwnd_used = tp->packets_out; tp->snd_cwnd_used = tp->packets_out;
if (sysctl_tcp_slow_start_after_idle && if (sock_net(sk)->ipv4.sysctl_tcp_slow_start_after_idle &&
(s32)(tcp_jiffies32 - tp->snd_cwnd_stamp) >= inet_csk(sk)->icsk_rto && (s32)(tcp_jiffies32 - tp->snd_cwnd_stamp) >= inet_csk(sk)->icsk_rto &&
!ca_ops->cong_control) !ca_ops->cong_control)
tcp_cwnd_application_limited(sk); tcp_cwnd_application_limited(sk);