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Date: Thu, 1 Aug 2013 17:49:41 -0400
From: Tejun Heo <tj@...nel.org>
To: lizefan@...wei.com
Cc: containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
Neil Horman <nhorman@...driver.com>,
"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 03/23] netprio_cgroup: pass around @css instead of @cgroup and kill struct cgroup_netprio_state
cgroup controller API will be converted to primarily use struct
cgroup_subsys_state instead of struct cgroup. In preparation, make
the internal functions of netprio_cgroup pass around @css instead of
@cgrp.
While at it, kill struct cgroup_netprio_state which only contained
struct cgroup_subsys_state without serving any purpose. All functions
are converted to deal with @css directly.
This patch shouldn't cause any behavior differences.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Neil Horman <nhorman@...driver.com>
Cc: David S. Miller <davem@...emloft.net>
---
include/net/netprio_cgroup.h | 4 ----
net/core/netprio_cgroup.c | 56 ++++++++++++++++++++++----------------------
2 files changed, 28 insertions(+), 32 deletions(-)
diff --git a/include/net/netprio_cgroup.h b/include/net/netprio_cgroup.h
index 8110fa7..a24f8bb 100644
--- a/include/net/netprio_cgroup.h
+++ b/include/net/netprio_cgroup.h
@@ -25,10 +25,6 @@ struct netprio_map {
u32 priomap[];
};
-struct cgroup_netprio_state {
- struct cgroup_subsys_state css;
-};
-
extern void sock_update_netprioidx(struct sock *sk);
#if IS_BUILTIN(CONFIG_NETPRIO_CGROUP)
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index ccf8523..5dfac88 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -29,12 +29,6 @@
#define PRIOMAP_MIN_SZ 128
-static inline struct cgroup_netprio_state *cgrp_netprio_state(struct cgroup *cgrp)
-{
- return container_of(cgroup_css(cgrp, net_prio_subsys_id),
- struct cgroup_netprio_state, css);
-}
-
/*
* Extend @dev->priomap so that it's large enough to accomodate
* @target_idx. @dev->priomap.priomap_len > @target_idx after successful
@@ -87,68 +81,72 @@ static int extend_netdev_table(struct net_device *dev, u32 target_idx)
/**
* netprio_prio - return the effective netprio of a cgroup-net_device pair
- * @cgrp: cgroup part of the target pair
+ * @css: css part of the target pair
* @dev: net_device part of the target pair
*
* Should be called under RCU read or rtnl lock.
*/
-static u32 netprio_prio(struct cgroup *cgrp, struct net_device *dev)
+static u32 netprio_prio(struct cgroup_subsys_state *css, struct net_device *dev)
{
struct netprio_map *map = rcu_dereference_rtnl(dev->priomap);
+ int id = css->cgroup->id;
- if (map && cgrp->id < map->priomap_len)
- return map->priomap[cgrp->id];
+ if (map && id < map->priomap_len)
+ return map->priomap[id];
return 0;
}
/**
* netprio_set_prio - set netprio on a cgroup-net_device pair
- * @cgrp: cgroup part of the target pair
+ * @css: css part of the target pair
* @dev: net_device part of the target pair
* @prio: prio to set
*
- * Set netprio to @prio on @cgrp-@dev pair. Should be called under rtnl
+ * Set netprio to @prio on @css-@dev pair. Should be called under rtnl
* lock and may fail under memory pressure for non-zero @prio.
*/
-static int netprio_set_prio(struct cgroup *cgrp, struct net_device *dev,
- u32 prio)
+static int netprio_set_prio(struct cgroup_subsys_state *css,
+ struct net_device *dev, u32 prio)
{
struct netprio_map *map;
+ int id = css->cgroup->id;
int ret;
/* avoid extending priomap for zero writes */
map = rtnl_dereference(dev->priomap);
- if (!prio && (!map || map->priomap_len <= cgrp->id))
+ if (!prio && (!map || map->priomap_len <= id))
return 0;
- ret = extend_netdev_table(dev, cgrp->id);
+ ret = extend_netdev_table(dev, id);
if (ret)
return ret;
map = rtnl_dereference(dev->priomap);
- map->priomap[cgrp->id] = prio;
+ map->priomap[id] = prio;
return 0;
}
static struct cgroup_subsys_state *cgrp_css_alloc(struct cgroup *cgrp)
{
- struct cgroup_netprio_state *cs;
+ struct cgroup_subsys_state *css;
- cs = kzalloc(sizeof(*cs), GFP_KERNEL);
- if (!cs)
+ css = kzalloc(sizeof(*css), GFP_KERNEL);
+ if (!css)
return ERR_PTR(-ENOMEM);
- return &cs->css;
+ return css;
}
static int cgrp_css_online(struct cgroup *cgrp)
{
- struct cgroup *parent = cgrp->parent;
+ struct cgroup_subsys_state *css = cgroup_css(cgrp, net_prio_subsys_id);
+ struct cgroup_subsys_state *parent_css;
struct net_device *dev;
int ret = 0;
- if (!parent)
+ if (!cgrp->parent)
return 0;
+ parent_css = cgroup_css(cgrp->parent, net_prio_subsys_id);
rtnl_lock();
/*
@@ -156,9 +154,9 @@ static int cgrp_css_online(struct cgroup *cgrp)
* onlining, there is no need to clear them on offline.
*/
for_each_netdev(&init_net, dev) {
- u32 prio = netprio_prio(parent, dev);
+ u32 prio = netprio_prio(parent_css, dev);
- ret = netprio_set_prio(cgrp, dev, prio);
+ ret = netprio_set_prio(css, dev, prio);
if (ret)
break;
}
@@ -168,7 +166,7 @@ static int cgrp_css_online(struct cgroup *cgrp)
static void cgrp_css_free(struct cgroup *cgrp)
{
- kfree(cgrp_netprio_state(cgrp));
+ kfree(cgroup_css(cgrp, net_prio_subsys_id));
}
static u64 read_prioidx(struct cgroup *cgrp, struct cftype *cft)
@@ -179,11 +177,12 @@ static u64 read_prioidx(struct cgroup *cgrp, struct cftype *cft)
static int read_priomap(struct cgroup *cont, struct cftype *cft,
struct cgroup_map_cb *cb)
{
+ struct cgroup_subsys_state *css = cgroup_css(cont, net_prio_subsys_id);
struct net_device *dev;
rcu_read_lock();
for_each_netdev_rcu(&init_net, dev)
- cb->fill(cb, dev->name, netprio_prio(cont, dev));
+ cb->fill(cb, dev->name, netprio_prio(css, dev));
rcu_read_unlock();
return 0;
}
@@ -191,6 +190,7 @@ static int read_priomap(struct cgroup *cont, struct cftype *cft,
static int write_priomap(struct cgroup *cgrp, struct cftype *cft,
const char *buffer)
{
+ struct cgroup_subsys_state *css = cgroup_css(cgrp, net_prio_subsys_id);
char devname[IFNAMSIZ + 1];
struct net_device *dev;
u32 prio;
@@ -205,7 +205,7 @@ static int write_priomap(struct cgroup *cgrp, struct cftype *cft,
rtnl_lock();
- ret = netprio_set_prio(cgrp, dev, prio);
+ ret = netprio_set_prio(css, dev, prio);
rtnl_unlock();
dev_put(dev);
--
1.8.3.1
--
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