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authorEric Dumazet <eric.dumazet@gmail.com>2010-09-23 23:51:51 +0000
committerDavid S. Miller <davem@davemloft.net>2010-09-26 19:04:08 -0700
commita7855c78a24d6348e989bec616318e68c662e78b (patch)
tree43ee591745e17569ad212be6ec3c46e58b443c0a
parent83180af0b0ea166adf8249f4513beb7355f9b4c9 (diff)
net: loopback driver cleanup
loopback driver uses dev->ml_priv to store its percpu stats pointer. It uses ugly casts "(void __percpu __force *)" to shut up sparse complains. Define an union to better document we use ml_priv in loopback driver and define a lstats field with appropriate types. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/loopback.c20
-rw-r--r--include/linux/netdevice.h6
2 files changed, 9 insertions, 17 deletions
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 9a0996795321..4b0e30b564e5 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -74,7 +74,6 @@ struct pcpu_lstats {
static netdev_tx_t loopback_xmit(struct sk_buff *skb,
struct net_device *dev)
{
- struct pcpu_lstats __percpu *pcpu_lstats;
struct pcpu_lstats *lb_stats;
int len;
@@ -83,8 +82,7 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
skb->protocol = eth_type_trans(skb, dev);
/* it's OK to use per_cpu_ptr() because BHs are off */
- pcpu_lstats = (void __percpu __force *)dev->ml_priv;
- lb_stats = this_cpu_ptr(pcpu_lstats);
+ lb_stats = this_cpu_ptr(dev->lstats);
len = skb->len;
if (likely(netif_rx(skb) == NET_RX_SUCCESS)) {
@@ -101,19 +99,17 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
static struct rtnl_link_stats64 *loopback_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *stats)
{
- const struct pcpu_lstats __percpu *pcpu_lstats;
u64 bytes = 0;
u64 packets = 0;
u64 drops = 0;
int i;
- pcpu_lstats = (void __percpu __force *)dev->ml_priv;
for_each_possible_cpu(i) {
const struct pcpu_lstats *lb_stats;
u64 tbytes, tpackets;
unsigned int start;
- lb_stats = per_cpu_ptr(pcpu_lstats, i);
+ lb_stats = per_cpu_ptr(dev->lstats, i);
do {
start = u64_stats_fetch_begin(&lb_stats->syncp);
tbytes = lb_stats->bytes;
@@ -147,22 +143,16 @@ static const struct ethtool_ops loopback_ethtool_ops = {
static int loopback_dev_init(struct net_device *dev)
{
- struct pcpu_lstats __percpu *lstats;
-
- lstats = alloc_percpu(struct pcpu_lstats);
- if (!lstats)
+ dev->lstats = alloc_percpu(struct pcpu_lstats);
+ if (!dev->lstats)
return -ENOMEM;
- dev->ml_priv = (void __force *)lstats;
return 0;
}
static void loopback_dev_free(struct net_device *dev)
{
- struct pcpu_lstats __percpu *lstats =
- (void __percpu __force *)dev->ml_priv;
-
- free_percpu(lstats);
+ free_percpu(dev->lstats);
free_netdev(dev);
}
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 45dcda5bfda9..01bd4c82d982 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1050,8 +1050,10 @@ struct net_device {
#endif
/* mid-layer private */
- void *ml_priv;
-
+ union {
+ void *ml_priv;
+ struct pcpu_lstats __percpu *lstats; /* loopback stats */
+ };
/* GARP */
struct garp_port *garp_port;