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xps: Add xps_queue_release function

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This patch moves the xps specific parts in netdev_queue_release into
its own function which netdev_queue_release can call.  This allows
netdev_queue_release to be more generic (for adding new attributes
to tx queues).

Signed-off-by: Tom Herbert <therbert@google.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2011-11-28 16:33:02 +00:00 committed by David S. Miller
parent c5d67bd78c
commit 927fbec13e
1 changed files with 47 additions and 42 deletions
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89
net/core/net-sysfs.c
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@ -910,6 +910,52 @@ static DEFINE_MUTEX(xps_map_mutex);
#define xmap_dereference(P) \
rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
static void xps_queue_release(struct netdev_queue *queue)
{
struct net_device *dev = queue->dev;
struct xps_dev_maps *dev_maps;
struct xps_map *map;
unsigned long index;
int i, pos, nonempty = 0;
index = get_netdev_queue_index(queue);
mutex_lock(&xps_map_mutex);
dev_maps = xmap_dereference(dev->xps_maps);
if (dev_maps) {
for_each_possible_cpu(i) {
map = xmap_dereference(dev_maps->cpu_map[i]);
if (!map)
continue;
for (pos = 0; pos < map->len; pos++)
if (map->queues[pos] == index)
break;
if (pos < map->len) {
if (map->len > 1)
map->queues[pos] =
map->queues[--map->len];
else {
RCU_INIT_POINTER(dev_maps->cpu_map[i],
NULL);
kfree_rcu(map, rcu);
map = NULL;
}
}
if (map)
nonempty = 1;
}
if (!nonempty) {
RCU_INIT_POINTER(dev->xps_maps, NULL);
kfree_rcu(dev_maps, rcu);
}
}
mutex_unlock(&xps_map_mutex);
}
static ssize_t store_xps_map(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
const char *buf, size_t len)
@ -1054,49 +1100,8 @@ static struct attribute *netdev_queue_default_attrs[] = {
static void netdev_queue_release(struct kobject *kobj)
{
struct netdev_queue *queue = to_netdev_queue(kobj);
struct net_device *dev = queue->dev;
struct xps_dev_maps *dev_maps;
struct xps_map *map;
unsigned long index;
int i, pos, nonempty = 0;
index = get_netdev_queue_index(queue);
mutex_lock(&xps_map_mutex);
dev_maps = xmap_dereference(dev->xps_maps);
if (dev_maps) {
for_each_possible_cpu(i) {
map = xmap_dereference(dev_maps->cpu_map[i]);
if (!map)
continue;
for (pos = 0; pos < map->len; pos++)
if (map->queues[pos] == index)
break;
if (pos < map->len) {
if (map->len > 1)
map->queues[pos] =
map->queues[--map->len];
else {
RCU_INIT_POINTER(dev_maps->cpu_map[i],
NULL);
kfree_rcu(map, rcu);
map = NULL;
}
}
if (map)
nonempty = 1;
}
if (!nonempty) {
RCU_INIT_POINTER(dev->xps_maps, NULL);
kfree_rcu(dev_maps, rcu);
}
}
mutex_unlock(&xps_map_mutex);
xps_queue_release(queue);
memset(kobj, 0, sizeof(*kobj));
dev_put(queue->dev);