Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753614AbdIGDKo (ORCPT ); Wed, 6 Sep 2017 23:10:44 -0400 Received: from cmccmta1.chinamobile.com ([221.176.66.79]:32157 "EHLO cmccmta1.chinamobile.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751985AbdIGDKn (ORCPT ); Wed, 6 Sep 2017 23:10:43 -0400 X-RM-TRANSID: 2ee459b0b8b00dc-991b9 X-RM-SPAM-FLAG: 00000000 X-RM-TRANSID: 2ee959b0b8afb6c-c0717 From: Haishuang Yan To: "David S. Miller" , Alexey Kuznetsov , Hideaki YOSHIFUJI , Eric Dumazet Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Haishuang Yan Subject: [PATCH] ipv4: Namespaceify tcp_max_orphans knob Date: Thu, 7 Sep 2017 11:10:08 +0800 Message-Id: <1504753808-13266-1-git-send-email-yanhaishuang@cmss.chinamobile.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3787 Lines: 117 Different namespace application might require different maximal number of TCP sockets independently of the host. Signed-off-by: Haishuang Yan --- include/net/netns/ipv4.h | 1 + include/net/tcp.h | 5 +++-- net/ipv4/sysctl_net_ipv4.c | 14 +++++++------- net/ipv4/tcp.c | 3 --- net/ipv4/tcp_input.c | 1 - net/ipv4/tcp_ipv4.c | 1 + 6 files changed, 12 insertions(+), 13 deletions(-) diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index 20d061c..305e031 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -127,6 +127,7 @@ struct netns_ipv4 { int sysctl_tcp_timestamps; struct inet_timewait_death_row tcp_death_row; int sysctl_max_syn_backlog; + int sysctl_tcp_max_orphans; #ifdef CONFIG_NET_L3_MASTER_DEV int sysctl_udp_l3mdev_accept; diff --git a/include/net/tcp.h b/include/net/tcp.h index b510f28..ac2d998 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -320,10 +320,11 @@ static inline bool tcp_too_many_orphans(struct sock *sk, int shift) { struct percpu_counter *ocp = sk->sk_prot->orphan_count; int orphans = percpu_counter_read_positive(ocp); + int tcp_max_orphans = sock_net(sk)->ipv4.sysctl_tcp_max_orphans; - if (orphans << shift > sysctl_tcp_max_orphans) { + if (orphans << shift > tcp_max_orphans) { orphans = percpu_counter_sum_positive(ocp); - if (orphans << shift > sysctl_tcp_max_orphans) + if (orphans << shift > tcp_max_orphans) return true; } return false; diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c index 0d3c038..4f26c8d3 100644 --- a/net/ipv4/sysctl_net_ipv4.c +++ b/net/ipv4/sysctl_net_ipv4.c @@ -394,13 +394,6 @@ static int proc_tcp_available_ulp(struct ctl_table *ctl, .proc_handler = proc_dointvec }, { - .procname = "tcp_max_orphans", - .data = &sysctl_tcp_max_orphans, - .maxlen = sizeof(int), - .mode = 0644, - .proc_handler = proc_dointvec - }, - { .procname = "tcp_fastopen", .data = &sysctl_tcp_fastopen, .maxlen = sizeof(int), @@ -1085,6 +1078,13 @@ static int proc_tcp_available_ulp(struct ctl_table *ctl, .mode = 0644, .proc_handler = proc_dointvec }, + { + .procname = "tcp_max_orphans", + .data = &init_net.ipv4.sysctl_tcp_max_orphans, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, #ifdef CONFIG_IP_ROUTE_MULTIPATH { .procname = "fib_multipath_use_neigh", diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 5091402..39187ac 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3522,9 +3522,6 @@ void __init tcp_init(void) } - cnt = tcp_hashinfo.ehash_mask + 1; - sysctl_tcp_max_orphans = cnt / 2; - tcp_init_mem(); /* Set per-socket limits to no more than 1/128 the pressure threshold */ limit = nr_free_buffer_pages() << (PAGE_SHIFT - 7); diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index c5d7656..0230509 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -88,7 +88,6 @@ int sysctl_tcp_stdurg __read_mostly; int sysctl_tcp_rfc1337 __read_mostly; -int sysctl_tcp_max_orphans __read_mostly = NR_FILE; int sysctl_tcp_frto __read_mostly = 2; int sysctl_tcp_min_rtt_wlen __read_mostly = 300; int sysctl_tcp_moderate_rcvbuf __read_mostly = 1; diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index a63486a..4b17a91 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2468,6 +2468,7 @@ static int __net_init tcp_sk_init(struct net *net) net->ipv4.tcp_death_row.hashinfo = &tcp_hashinfo; net->ipv4.sysctl_max_syn_backlog = max(128, cnt / 256); + net->ipv4.sysctl_tcp_max_orphans = cnt / 2; net->ipv4.sysctl_tcp_sack = 1; net->ipv4.sysctl_tcp_window_scaling = 1; net->ipv4.sysctl_tcp_timestamps = 1; -- 1.8.3.1