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tcp: Namespace-ify sysctl_tcp_default_congestion_control

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Make default TCP default congestion control to a per namespace
value. This changes default congestion control to a pointer to congestion ops
(rather than implicit as first element of available lsit).

The congestion control setting of new namespaces is inherited
from the current setting of the root namespace.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger
2017-11-14 08:25:49 -08:00
committed by David S. Miller
parent 11bf284f81
commit 6670e15244
7 changed files with 64 additions and 54 deletions
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9
net/ipv4/tcp_ipv4.c
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@ -2430,6 +2430,8 @@ static void __net_exit tcp_sk_exit(struct net *net)
{
int cpu;
module_put(net->ipv4.tcp_congestion_control->owner);
for_each_possible_cpu(cpu)
inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu));
free_percpu(net->ipv4.tcp_sk);
@ -2522,6 +2524,13 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60;
atomic_set(&net->ipv4.tfo_active_disable_times, 0);
/* Reno is always built in */
if (!net_eq(net, &init_net) &&
try_module_get(init_net.ipv4.tcp_congestion_control->owner))
net->ipv4.tcp_congestion_control = init_net.ipv4.tcp_congestion_control;
else
net->ipv4.tcp_congestion_control = &tcp_reno;
return 0;
fail:
tcp_sk_exit(net);