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[NET]: Inline net_device_stats

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Network drivers which keep stats allocate their own stats structure
then write a get_stats() function to return them.  It would be nice if
this were done by default.

1) Add a new "stats" field to "struct net_device".
2) Add a new feature field to say "this driver uses the internal one"
3) Have a default "get_stats" which returns NULL if that feature not set.
4) Change callers to check result of get_stats call for NULL, not if
   ->get_stats is set.

This should not break backwards compatibility with older drivers, yet
allow modern drivers to shed some boilerplate code.

Lightly tested: works for a modified lguest network driver.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rusty Russell 2007-03-28 14:29:08 -07:00 committed by David S. Miller
parent f859581519
commit c45d286e72
5 changed files with 18 additions and 10 deletions
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4
arch/s390/appldata/appldata_net_sum.c
View File

@ -108,10 +108,10 @@ static void appldata_get_net_sum_data(void *data)
collisions = 0;
read_lock(&dev_base_lock);
for (dev = dev_base; dev != NULL; dev = dev->next) {
if (dev->get_stats == NULL) {
stats = dev->get_stats(dev);
if (stats == NULL) {
continue;
}
stats = dev->get_stats(dev);
rx_packets += stats->rx_packets;
tx_packets += stats->tx_packets;
rx_bytes += stats->rx_bytes;

5
drivers/net/bonding/bond_main.c
View File

@ -3640,9 +3640,8 @@ static struct net_device_stats *bond_get_stats(struct net_device *bond_dev)
read_lock_bh(&bond->lock);
bond_for_each_slave(bond, slave, i) {
if (slave->dev->get_stats) {
sstats = slave->dev->get_stats(slave->dev);
sstats = slave->dev->get_stats(slave->dev);
if (sstats) {
stats->rx_packets += sstats->rx_packets;
stats->rx_bytes += sstats->rx_bytes;
stats->rx_errors += sstats->rx_errors;

4
drivers/parisc/led.c
View File

@ -372,9 +372,9 @@ static __inline__ int led_get_net_activity(void)
continue;
if (LOOPBACK(in_dev->ifa_list->ifa_local))
continue;
if (!dev->get_stats)
continue;
stats = dev->get_stats(dev);
if (!stats)
continue;
rx_total += stats->rx_packets;
tx_total += stats->tx_packets;
}

2
include/linux/netdevice.h
View File

@ -323,6 +323,7 @@ struct net_device
#define NETIF_F_VLAN_CHALLENGED 1024 /* Device cannot handle VLAN packets */
#define NETIF_F_GSO 2048 /* Enable software GSO. */
#define NETIF_F_LLTX 4096 /* LockLess TX */
#define NETIF_F_INTERNAL_STATS 8192 /* Use stats structure in net_device */
/* Segmentation offload features */
#define NETIF_F_GSO_SHIFT 16
@ -347,6 +348,7 @@ struct net_device
struct net_device_stats* (*get_stats)(struct net_device *dev);
struct net_device_stats stats;
/* List of functions to handle Wireless Extensions (instead of ioctl).
* See <net/iw_handler.h> for details. Jean II */

13
net/core/dev.c
View File

@ -817,7 +817,6 @@ static int default_rebuild_header(struct sk_buff *skb)
return 1;
}
/**
* dev_open - prepare an interface for use.
* @dev: device to open
@ -2096,9 +2095,9 @@ void dev_seq_stop(struct seq_file *seq, void *v)
static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
if (dev->get_stats) {
struct net_device_stats *stats = dev->get_stats(dev);
struct net_device_stats *stats = dev->get_stats(dev);
if (stats) {
seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
"%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
dev->name, stats->rx_bytes, stats->rx_packets,
@ -3282,6 +3281,13 @@ out:
mutex_unlock(&net_todo_run_mutex);
}
static struct net_device_stats *maybe_internal_stats(struct net_device *dev)
{
if (dev->features & NETIF_F_INTERNAL_STATS)
return &dev->stats;
return NULL;
}
/**
* alloc_netdev - allocate network device
* @sizeof_priv: size of private data to allocate space for
@ -3317,6 +3323,7 @@ struct net_device *alloc_netdev(int sizeof_priv, const char *name,
if (sizeof_priv)
dev->priv = netdev_priv(dev);
dev->get_stats = maybe_internal_stats;
setup(dev);
strcpy(dev->name, name);
return dev;