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netprio_cgroup: allow nesting and inherit config on cgroup creation

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Inherit netprio configuration from ->css_online(), allow nesting and
remove .broken_hierarchy marking.  This makes netprio_cgroup's
behavior match netcls_cgroup's.

Note that this patch changes userland-visible behavior.  Nesting is
allowed and the first level cgroups below the root cgroup behave
differently - they inherit priorities from the root cgroup on creation
instead of starting with 0.  This is unfortunate but not doing so is
much crazier.

Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-and-Acked-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Acked-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tejun Heo 2012-11-22 07:32:47 -08:00
parent 666b0ebe2b
commit 811d8d6ff5
2 changed files with 26 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/cgroups/net_prio.txt
View File

@ -51,3 +51,5 @@ One usage for the net_prio cgroup is with mqprio qdisc allowing application
traffic to be steered to hardware/driver based traffic classes. These mappings
can then be managed by administrators or other networking protocols such as
DCBX.
A new net_prio cgroup inherits the parent's configuration.

42
net/core/netprio_cgroup.c
View File

@ -136,9 +136,6 @@ static struct cgroup_subsys_state *cgrp_css_alloc(struct cgroup *cgrp)
{
struct cgroup_netprio_state *cs;
if (cgrp->parent && cgrp->parent->id)
return ERR_PTR(-EINVAL);
cs = kzalloc(sizeof(*cs), GFP_KERNEL);
if (!cs)
return ERR_PTR(-ENOMEM);
@ -146,16 +143,34 @@ static struct cgroup_subsys_state *cgrp_css_alloc(struct cgroup *cgrp)
return &cs->css;
}
static void cgrp_css_free(struct cgroup *cgrp)
static int cgrp_css_online(struct cgroup *cgrp)
{
struct cgroup_netprio_state *cs = cgrp_netprio_state(cgrp);
struct cgroup *parent = cgrp->parent;
struct net_device *dev;
int ret = 0;
if (!parent)
return 0;
rtnl_lock();
for_each_netdev(&init_net, dev)
WARN_ON_ONCE(netprio_set_prio(cgrp, dev, 0));
/*
* Inherit prios from the parent. As all prios are set during
* onlining, there is no need to clear them on offline.
*/
for_each_netdev(&init_net, dev) {
u32 prio = netprio_prio(parent, dev);
ret = netprio_set_prio(cgrp, dev, prio);
if (ret)
break;
}
rtnl_unlock();
kfree(cs);
return ret;
}
static void cgrp_css_free(struct cgroup *cgrp)
{
kfree(cgrp_netprio_state(cgrp));
}
static u64 read_prioidx(struct cgroup *cgrp, struct cftype *cft)
@ -237,21 +252,12 @@ static struct cftype ss_files[] = {
struct cgroup_subsys net_prio_subsys = {
.name = "net_prio",
.css_alloc = cgrp_css_alloc,
.css_online = cgrp_css_online,
.css_free = cgrp_css_free,
.attach = net_prio_attach,
.subsys_id = net_prio_subsys_id,
.base_cftypes = ss_files,
.module = THIS_MODULE,
/*
* net_prio has artificial limit on the number of cgroups and
* disallows nesting making it impossible to co-mount it with other
* hierarchical subsystems. Remove the artificially low PRIOIDX_SZ
* limit and properly nest configuration such that children follow
* their parents' configurations by default and are allowed to
* override and remove the following.
*/
.broken_hierarchy = true,
};
static int netprio_device_event(struct notifier_block *unused,