[PATCH 03/10] netprio: use css ID instead of cgroup ID

Tejun Heo
2019-11-05T00:00:01Z

netprio uses cgroup ID to index the priority mapping table. This is
currently okay as cgroup IDs are allocated using idr and packed.
However, cgroup IDs will be changed to use full 64bit range and won't
be packed making this impractical. netprio doesn't care what type of
IDs it uses as long as they can identify the controller instances and
are packed. Let's switch to css IDs instead of cgroup IDs.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
Hello,

This is to prepare for kernfs 64bit ino support. It'd be best to
route this with the rest of kernfs patchset.

Thanks.

include/net/netprio_cgroup.h | 2 +-
net/core/netprio_cgroup.c | 8 ++++----
2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/net/netprio_cgroup.h b/include/net/netprio_cgroup.h
index cfc9441ef074..dec7522b6ce1 100644
--- a/include/net/netprio_cgroup.h
+++ b/include/net/netprio_cgroup.h
@@ -26,7 +26,7 @@ static inline u32 task_netprioidx(struct task_struct *p)

rcu_read_lock();
css = task_css(p, net_prio_cgrp_id);
- idx = css->cgroup->id;
+ idx = css->id;
rcu_read_unlock();
return idx;
}
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 256b7954b720..8881dd943dd0 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -93,7 +93,7 @@ static int extend_netdev_table(struct net_device *dev, u32 target_idx)
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;
+ int id = css->id;

if (map && id < map->priomap_len)
return map->priomap[id];
@@ -113,7 +113,7 @@ 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 id = css->id;
int ret;

/* avoid extending priomap for zero writes */
@@ -177,7 +177,7 @@ static void cgrp_css_free(struct cgroup_subsys_state *css)

static u64 read_prioidx(struct cgroup_subsys_state *css, struct cftype *cft)
{
- return css->cgroup->id;
+ return css->id;
}

static int read_priomap(struct seq_file *sf, void *v)
@@ -237,7 +237,7 @@ static void net_prio_attach(struct cgroup_taskset *tset)
struct cgroup_subsys_state *css;

cgroup_taskset_for_each(p, css, tset) {
- void *v = (void *)(unsigned long)css->cgroup->id;
+ void *v = (void *)(unsigned long)css->id;

task_lock(p);
iterate_fd(p->files, 0, update_netprio, v);
--
2.17.1