[NET]: Allow controlling NAPI device weight with sysfs

Simple interface to allow changing network device scheduling weight
with sysfs. Please consider this for 2.6.12, since risk/impact is small.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 910eb4c05a47..e2137f3e489d 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -185,6 +185,22 @@ static ssize_t store_tx_queue_len(struct class_device *dev, const char *buf, siz
 static CLASS_DEVICE_ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, 
                          store_tx_queue_len);
 
+NETDEVICE_SHOW(weight, fmt_dec);
+
+static int change_weight(struct net_device *net, unsigned long new_weight)
+{
+        net->weight = new_weight;
+        return 0;
+}
+
+static ssize_t store_weight(struct class_device *dev, const char *buf, size_t len)
+{
+        return netdev_store(dev, buf, len, change_weight);
+}
+
+static CLASS_DEVICE_ATTR(weight, S_IRUGO | S_IWUSR, show_weight, 
+                         store_weight);
+
 
 static struct class_device_attribute *net_class_attributes[] = {
         &class_device_attr_ifindex,
@@ -194,6 +210,7 @@ static struct class_device_attribute *net_class_attributes[] = {
         &class_device_attr_features,
         &class_device_attr_mtu,
         &class_device_attr_flags,
+        &class_device_attr_weight,
         &class_device_attr_type,
         &class_device_attr_address,
         &class_device_attr_broadcast,