From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: [patch 1/1] cgroups: net_cls as module Date: Tue, 23 Mar 2010 11:24:03 -0400 Message-ID: <201003231824.o2NIOtRD018169@imap1.linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Cc: netdev@vger.kernel.org, akpm@linux-foundation.org, bblum@andrew.cmu.edu, kamezawa.hiroyu@jp.fujitsu.com, laijs@cn.fujitsu.com, lizf@cn.fujitsu.com, menage@google.com To: davem@davemloft.net Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:41748 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750864Ab0CWSZI (ORCPT ); Tue, 23 Mar 2010 14:25:08 -0400 Sender: netdev-owner@vger.kernel.org List-ID: From: Ben Blum Allows the net_cls cgroup subsystem to be compiled as a module This patch modifies net/sched/cls_cgroup.c to allow the net_cls subsystem to be optionally compiled as a module instead of builtin. The cgroup_subsys struct is moved around a bit to allow the subsys_id to be either declared as a compile-time constant by the cgroup_subsys.h include in cgroup.h, or, if it's a module, initialized within the struct by cgroup_load_subsys. Signed-off-by: Ben Blum Acked-by: Li Zefan Cc: Paul Menage Cc: "David S. Miller" Cc: KAMEZAWA Hiroyuki Cc: Lai Jiangshan Signed-off-by: Andrew Morton --- net/sched/Kconfig | 5 ++++- net/sched/cls_cgroup.c | 36 +++++++++++++++++++++++++++--------- 2 files changed, 31 insertions(+), 10 deletions(-) diff -puN net/sched/Kconfig~cgroups-net_cls-as-module net/sched/Kconfig --- a/net/sched/Kconfig~cgroups-net_cls-as-module +++ a/net/sched/Kconfig @@ -328,13 +328,16 @@ config NET_CLS_FLOW module will be called cls_flow. config NET_CLS_CGROUP - bool "Control Group Classifier" + tristate "Control Group Classifier" select NET_CLS depends on CGROUPS ---help--- Say Y here if you want to classify packets based on the control cgroup of their process. + To compile this code as a module, choose M here: the + module will be called cls_cgroup. + config NET_EMATCH bool "Extended Matches" select NET_CLS diff -puN net/sched/cls_cgroup.c~cgroups-net_cls-as-module net/sched/cls_cgroup.c --- a/net/sched/cls_cgroup.c~cgroups-net_cls-as-module +++ a/net/sched/cls_cgroup.c @@ -24,6 +24,25 @@ struct cgroup_cls_state u32 classid; }; +static struct cgroup_subsys_state *cgrp_create(struct cgroup_subsys *ss, + struct cgroup *cgrp); +static void cgrp_destroy(struct cgroup_subsys *ss, struct cgroup *cgrp); +static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp); + +struct cgroup_subsys net_cls_subsys = { + .name = "net_cls", + .create = cgrp_create, + .destroy = cgrp_destroy, + .populate = cgrp_populate, +#ifdef CONFIG_NET_CLS_CGROUP + .subsys_id = net_cls_subsys_id, +#else +#define net_cls_subsys_id net_cls_subsys.subsys_id +#endif + .module = THIS_MODULE, +}; + + static inline struct cgroup_cls_state *cgrp_cls_state(struct cgroup *cgrp) { return container_of(cgroup_subsys_state(cgrp, net_cls_subsys_id), @@ -79,14 +98,6 @@ static int cgrp_populate(struct cgroup_s return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files)); } -struct cgroup_subsys net_cls_subsys = { - .name = "net_cls", - .create = cgrp_create, - .destroy = cgrp_destroy, - .populate = cgrp_populate, - .subsys_id = net_cls_subsys_id, -}; - struct cls_cgroup_head { u32 handle; @@ -277,12 +288,19 @@ static struct tcf_proto_ops cls_cgroup_o static int __init init_cgroup_cls(void) { - return register_tcf_proto_ops(&cls_cgroup_ops); + int ret = register_tcf_proto_ops(&cls_cgroup_ops); + if (ret) + return ret; + ret = cgroup_load_subsys(&net_cls_subsys); + if (ret) + unregister_tcf_proto_ops(&cls_cgroup_ops); + return ret; } static void __exit exit_cgroup_cls(void) { unregister_tcf_proto_ops(&cls_cgroup_ops); + cgroup_unload_subsys(&net_cls_subsys); } module_init(init_cgroup_cls); _