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tcp: Namespace-ify sysctl_tcp_rmem and sysctl_tcp_wmem

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Note that when a new netns is created, it inherits its
sysctl_tcp_rmem and sysctl_tcp_wmem from initial netns.

This change is needed so that we can refine TCP rcvbuf autotuning,
to take RTT into consideration.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-11-07 00:29:28 -08:00 • committed by David S. Miller
parent a3dcaf17ee
commit 356d1833b6
8 changed files with 47 additions and 43 deletions
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13
net/ipv4/tcp_ipv4.c
View file

@ -2409,8 +2409,8 @@ struct proto tcp_prot = {
.memory_allocated = &tcp_memory_allocated,
.memory_pressure = &tcp_memory_pressure,
.sysctl_mem = sysctl_tcp_mem,
.sysctl_wmem = sysctl_tcp_wmem,
.sysctl_rmem = sysctl_tcp_rmem,
.sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem),
.sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem),
.max_header = MAX_TCP_HEADER,
.obj_size = sizeof(struct tcp_sock),
.slab_flags = SLAB_TYPESAFE_BY_RCU,
@ -2509,7 +2509,14 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_tcp_invalid_ratelimit = HZ/2;
net->ipv4.sysctl_tcp_pacing_ss_ratio = 200;
net->ipv4.sysctl_tcp_pacing_ca_ratio = 120;
if (net != &init_net) {
memcpy(net->ipv4.sysctl_tcp_rmem,
init_net.ipv4.sysctl_tcp_rmem,
sizeof(init_net.ipv4.sysctl_tcp_rmem));
memcpy(net->ipv4.sysctl_tcp_wmem,
init_net.ipv4.sysctl_tcp_wmem,
sizeof(init_net.ipv4.sysctl_tcp_wmem));
}
net->ipv4.sysctl_tcp_fastopen = TFO_CLIENT_ENABLE;
spin_lock_init(&net->ipv4.tcp_fastopen_ctx_lock);
net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60;