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authorEric W. Biederman <ebiederm@xmission.com>2007-09-26 22:08:12 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 16:52:47 -0700
commit5f6d88b9149d537f3db0798f7d312be632422e15 (patch)
tree8e85e14c152a5b6c7f61ef2176cb6ed53854e280
parent9dd776b6d7b0b85966b6ddd03e2b2aae59012ab1 (diff)
[NET]: Dynamically allocate the per cpu counters for the loopback device.
This patch add support for dynamically allocating the statistics counters for the loopback device and adds appropriate device methods for allocating and freeing the loopback device. This completes support for creating multiple instances of the loopback device, in preparation for creating per network namespace instances. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/loopback.c32
1 files changed, 28 insertions, 4 deletions
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 4b6f7b2abea..f3018bb7570 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -62,7 +62,6 @@ struct pcpu_lstats {
unsigned long packets;
unsigned long bytes;
};
-static DEFINE_PER_CPU(struct pcpu_lstats, pcpu_lstats);
#define LOOPBACK_OVERHEAD (128 + MAX_HEADER + 16 + 16)
@@ -134,7 +133,7 @@ static void emulate_large_send_offload(struct sk_buff *skb)
*/
static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
{
- struct pcpu_lstats *lb_stats;
+ struct pcpu_lstats *pcpu_lstats, *lb_stats;
skb_orphan(skb);
@@ -155,7 +154,8 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
dev->last_rx = jiffies;
/* it's OK to use __get_cpu_var() because BHs are off */
- lb_stats = &__get_cpu_var(pcpu_lstats);
+ pcpu_lstats = netdev_priv(dev);
+ lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id());
lb_stats->bytes += skb->len;
lb_stats->packets++;
@@ -166,15 +166,17 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
static struct net_device_stats *get_stats(struct net_device *dev)
{
+ const struct pcpu_lstats *pcpu_lstats;
struct net_device_stats *stats = &dev->stats;
unsigned long bytes = 0;
unsigned long packets = 0;
int i;
+ pcpu_lstats = netdev_priv(dev);
for_each_possible_cpu(i) {
const struct pcpu_lstats *lb_stats;
- lb_stats = &per_cpu(pcpu_lstats, i);
+ lb_stats = per_cpu_ptr(pcpu_lstats, i);
bytes += lb_stats->bytes;
packets += lb_stats->packets;
}
@@ -198,6 +200,26 @@ static const struct ethtool_ops loopback_ethtool_ops = {
.get_rx_csum = always_on,
};
+static int loopback_dev_init(struct net_device *dev)
+{
+ struct pcpu_lstats *lstats;
+
+ lstats = alloc_percpu(struct pcpu_lstats);
+ if (!lstats)
+ return -ENOMEM;
+
+ dev->priv = lstats;
+ return 0;
+}
+
+static void loopback_dev_free(struct net_device *dev)
+{
+ struct pcpu_lstats *lstats = netdev_priv(dev);
+
+ free_percpu(lstats);
+ free_netdev(dev);
+}
+
/*
* The loopback device is special. There is only one instance and
* it is statically allocated. Don't do this for other devices.
@@ -225,6 +247,8 @@ static void loopback_setup(struct net_device *dev)
| NETIF_F_LLTX
| NETIF_F_NETNS_LOCAL,
dev->ethtool_ops = &loopback_ethtool_ops;
+ dev->init = loopback_dev_init;
+ dev->destructor = loopback_dev_free;
}
/* Setup and register the loopback device. */