[PATCH 4/9] ipv4: Namespaceify tcp reordering sysctl knob
From: Nikolay Borisov
Date: Mon Jan 11 2016 - 04:54:58 EST
Signed-off-by: Nikolay Borisov <kernel@xxxxxxxx>
---
include/net/netns/ipv4.h | 2 +-
include/net/tcp.h | 4 +++-
net/ipv4/sysctl_net_ipv4.c | 14 +++++++-------
net/ipv4/tcp.c | 2 +-
net/ipv4/tcp_input.c | 12 ++++++------
net/ipv4/tcp_ipv4.c | 2 +-
net/ipv4/tcp_metrics.c | 3 ++-
7 files changed, 21 insertions(+), 18 deletions(-)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 80da0d095eaf..dff8879e02fe 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -97,8 +97,8 @@ struct netns_ipv4 {
int sysctl_tcp_syn_retries;
int sysctl_tcp_synack_retries;
-
int sysctl_tcp_syncookies;
+ int sysctl_tcp_reordering;
struct ping_group_range ping_group_range;
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5497cc809601..64d01d289441 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -959,9 +959,11 @@ static inline void tcp_enable_fack(struct tcp_sock *tp)
*/
static inline void tcp_enable_early_retrans(struct tcp_sock *tp)
{
+ struct net *net = sock_net((struct sock *)tp);
+
tp->do_early_retrans = sysctl_tcp_early_retrans &&
sysctl_tcp_early_retrans < 4 && !sysctl_tcp_thin_dupack &&
- sysctl_tcp_reordering == 3;
+ net->ipv4.sysctl_tcp_reordering == 3;
}
static inline void tcp_disable_early_retrans(struct tcp_sock *tp)
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 007b9f8f7a2a..12d752e6380b 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -457,13 +457,6 @@ static struct ctl_table ipv4_table[] = {
.proc_handler = proc_dointvec,
},
{
- .procname = "tcp_reordering",
- .data = &sysctl_tcp_reordering,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec
- },
- {
.procname = "tcp_max_reordering",
.data = &sysctl_tcp_max_reordering,
.maxlen = sizeof(int),
@@ -950,6 +943,13 @@ static struct ctl_table ipv4_net_table[] = {
.proc_handler = proc_dointvec
},
#endif
+ {
+ .procname = "tcp_reordering",
+ .data = &init_net.ipv4.sysctl_tcp_reordering,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
{ }
};
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index bb36a39b5685..d0547395d81d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -405,7 +405,7 @@ void tcp_init_sock(struct sock *sk)
tp->mss_cache = TCP_MSS_DEFAULT;
u64_stats_init(&tp->syncp);
- tp->reordering = sysctl_tcp_reordering;
+ tp->reordering = sock_net(sk)->ipv4.sysctl_tcp_reordering;
tcp_enable_early_retrans(tp);
tcp_assign_congestion_control(sk);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index dc8fe6c8a2e0..3f08bba46147 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -80,9 +80,7 @@ int sysctl_tcp_timestamps __read_mostly = 1;
int sysctl_tcp_window_scaling __read_mostly = 1;
int sysctl_tcp_sack __read_mostly = 1;
int sysctl_tcp_fack __read_mostly = 1;
-int sysctl_tcp_reordering __read_mostly = TCP_FASTRETRANS_THRESH;
int sysctl_tcp_max_reordering __read_mostly = 300;
-EXPORT_SYMBOL(sysctl_tcp_reordering);
int sysctl_tcp_dsack __read_mostly = 1;
int sysctl_tcp_app_win __read_mostly = 31;
int sysctl_tcp_adv_win_scale __read_mostly = 1;
@@ -1873,6 +1871,7 @@ void tcp_enter_loss(struct sock *sk)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
+ struct net *net = sock_net(sk);
struct sk_buff *skb;
bool new_recovery = icsk->icsk_ca_state < TCP_CA_Recovery;
bool is_reneg; /* is receiver reneging on SACKs? */
@@ -1923,9 +1922,9 @@ void tcp_enter_loss(struct sock *sk)
* suggests that the degree of reordering is over-estimated.
*/
if (icsk->icsk_ca_state <= TCP_CA_Disorder &&
- tp->sacked_out >= sysctl_tcp_reordering)
+ tp->sacked_out >= net->ipv4.sysctl_tcp_reordering)
tp->reordering = min_t(unsigned int, tp->reordering,
- sysctl_tcp_reordering);
+ net->ipv4.sysctl_tcp_reordering);
tcp_set_ca_state(sk, TCP_CA_Loss);
tp->high_seq = tp->snd_nxt;
tcp_ecn_queue_cwr(tp);
@@ -2109,6 +2108,7 @@ static bool tcp_time_to_recover(struct sock *sk, int flag)
{
struct tcp_sock *tp = tcp_sk(sk);
__u32 packets_out;
+ int tcp_reordering = sock_net(sk)->ipv4.sysctl_tcp_reordering;
/* Trick#1: The loss is proven. */
if (tp->lost_out)
@@ -2123,7 +2123,7 @@ static bool tcp_time_to_recover(struct sock *sk, int flag)
*/
packets_out = tp->packets_out;
if (packets_out <= tp->reordering &&
- tp->sacked_out >= max_t(__u32, packets_out/2, sysctl_tcp_reordering) &&
+ tp->sacked_out >= max_t(__u32, packets_out/2, tcp_reordering) &&
!tcp_may_send_now(sk)) {
/* We have nothing to send. This connection is limited
* either by receiver window or by application.
@@ -3304,7 +3304,7 @@ static inline bool tcp_may_raise_cwnd(const struct sock *sk, const int flag)
* new SACK or ECE mark may first advance cwnd here and later reduce
* cwnd in tcp_fastretrans_alert() based on more states.
*/
- if (tcp_sk(sk)->reordering > sysctl_tcp_reordering)
+ if (tcp_sk(sk)->reordering > sock_net(sk)->ipv4.sysctl_tcp_reordering)
return flag & FLAG_FORWARD_PROGRESS;
return flag & FLAG_DATA_ACKED;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ee3566377717..785bbebd6768 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2383,8 +2383,8 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_syn_retries = TCP_SYN_RETRIES;
net->ipv4.sysctl_tcp_synack_retries = TCP_SYNACK_RETRIES;
-
net->ipv4.sysctl_tcp_syncookies = 0;
+ net->ipv4.sysctl_tcp_reordering = TCP_FASTRETRANS_THRESH;
return 0;
fail:
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index c8cbc2b4b792..c26241f3057b 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -369,6 +369,7 @@ void tcp_update_metrics(struct sock *sk)
const struct inet_connection_sock *icsk = inet_csk(sk);
struct dst_entry *dst = __sk_dst_get(sk);
struct tcp_sock *tp = tcp_sk(sk);
+ struct net *net = sock_net(sk);
struct tcp_metrics_block *tm;
unsigned long rtt;
u32 val;
@@ -473,7 +474,7 @@ void tcp_update_metrics(struct sock *sk)
if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) {
val = tcp_metric_get(tm, TCP_METRIC_REORDERING);
if (val < tp->reordering &&
- tp->reordering != sysctl_tcp_reordering)
+ tp->reordering != net->ipv4.sysctl_tcp_reordering)
tcp_metric_set(tm, TCP_METRIC_REORDERING,
tp->reordering);
}
--
2.5.0