tcp: Namespace-ify sysctl_tcp_pacing_ss_ratio

Also remove an obsolete comment about TCP pacing.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index e52c212..eb2dcf1 100644 (file)
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -152,6 +152,7 @@ struct netns_ipv4 {
        int sysctl_tcp_min_rtt_wlen;
        int sysctl_tcp_autocorking;
        int sysctl_tcp_invalid_ratelimit;
+       int sysctl_tcp_pacing_ss_ratio;
        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 5869a82..2a5f826 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -250,7 +250,6 @@ extern int sysctl_tcp_rmem[3];
 
 #define TCP_RACK_LOSS_DETECTION  0x1 /* Use RACK to detect losses */
 
-extern int sysctl_tcp_pacing_ss_ratio;
 extern int sysctl_tcp_pacing_ca_ratio;
 
 extern atomic_long_t tcp_memory_allocated;

diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 6a9349c..7f0dba8 100644 (file)
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -493,15 +493,6 @@ static struct ctl_table ipv4_table[] = {
                .proc_handler   = proc_allowed_congestion_control,
        },
        {
-               .procname       = "tcp_pacing_ss_ratio",
-               .data           = &sysctl_tcp_pacing_ss_ratio,
-               .maxlen         = sizeof(int),
-               .mode           = 0644,
-               .proc_handler   = proc_dointvec_minmax,
-               .extra1         = &zero,
-               .extra2         = &thousand,
-       },
-       {
                .procname       = "tcp_pacing_ca_ratio",
                .data           = &sysctl_tcp_pacing_ca_ratio,
                .maxlen         = sizeof(int),
@@ -1145,6 +1136,15 @@ static struct ctl_table ipv4_net_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec_ms_jiffies,
        },
+       {
+               .procname       = "tcp_pacing_ss_ratio",
+               .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec_minmax,
+               .extra1         = &zero,
+               .extra2         = &thousand,
+       },
        { }
 };
 

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index db4d458..29539d3 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -767,13 +767,6 @@ static void tcp_rtt_estimator(struct sock *sk, long mrtt_us)
        tp->srtt_us = max(1U, srtt);
 }
 
-/* Set the sk_pacing_rate to allow proper sizing of TSO packets.
- * Note: TCP stack does not yet implement pacing.
- * FQ packet scheduler can be used to implement cheap but effective
- * TCP pacing, to smooth the burst on large writes when packets
- * in flight is significantly lower than cwnd (or rwin)
- */
-int sysctl_tcp_pacing_ss_ratio __read_mostly = 200;
 int sysctl_tcp_pacing_ca_ratio __read_mostly = 120;
 
 static void tcp_update_pacing_rate(struct sock *sk)
@@ -793,7 +786,7 @@ static void tcp_update_pacing_rate(struct sock *sk)
         *       end of slow start and should slow down.
         */
        if (tp->snd_cwnd < tp->snd_ssthresh / 2)
-               rate *= sysctl_tcp_pacing_ss_ratio;
+               rate *= sock_net(sk)->ipv4.sysctl_tcp_pacing_ss_ratio;
        else
                rate *= sysctl_tcp_pacing_ca_ratio;
 

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 6617aae..1d8fc66 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2507,6 +2507,7 @@ static int __net_init tcp_sk_init(struct net *net)
        net->ipv4.sysctl_tcp_min_rtt_wlen = 300;
        net->ipv4.sysctl_tcp_autocorking = 1;
        net->ipv4.sysctl_tcp_invalid_ratelimit = HZ/2;
+       net->ipv4.sysctl_tcp_pacing_ss_ratio = 200;
 
        net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
        spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);