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[NET] loopback: minor statistics optimization

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The loopback device status structure is a singleton and doesn't
need to be allocated. Add ethtool_ops hooks to show checksum always on,
and make ethtool_ops const.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-09-27 20:33:34 -07:00 • committed by David S. Miller
parent 1b0fee7d68
commit 7fa6b06689
1 changed files with 14 additions and 17 deletions
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31
drivers/net/loopback.c
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@ -161,15 +161,13 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
return(0); return(0);
} }
static struct net_device_stats loopback_stats;
static struct net_device_stats *get_stats(struct net_device *dev) static struct net_device_stats *get_stats(struct net_device *dev)
{ {
struct net_device_stats *stats = dev->priv; struct net_device_stats *stats = &loopback_stats;
int i; int i;
if (!stats) {
return NULL;
}
memset(stats, 0, sizeof(struct net_device_stats)); memset(stats, 0, sizeof(struct net_device_stats));
for_each_possible_cpu(i) { for_each_possible_cpu(i) {
@ -185,19 +183,28 @@ static struct net_device_stats *get_stats(struct net_device *dev)
return stats; return stats;
} }
static u32 loopback_get_link(struct net_device *dev) static u32 always_on(struct net_device *dev)
{ {
return 1; return 1;
} }
static const struct ethtool_ops loopback_ethtool_ops = { static const struct ethtool_ops loopback_ethtool_ops = {
.get_link = loopback_get_link, .get_link = always_on,
.get_tso = ethtool_op_get_tso, .get_tso = ethtool_op_get_tso,
.set_tso = ethtool_op_set_tso, .set_tso = ethtool_op_set_tso,
.get_tx_csum = always_on,
.get_sg = always_on,
.get_rx_csum = always_on,
}; };
/*
* The loopback device is special. There is only one instance and
* it is statically allocated. Don't do this for other devices.
*/
struct net_device loopback_dev = { struct net_device loopback_dev = {
.name = "lo", .name = "lo",
.get_stats = &get_stats,
.priv = &loopback_stats,
.mtu = (16 * 1024) + 20 + 20 + 12, .mtu = (16 * 1024) + 20 + 20 + 12,
.hard_start_xmit = loopback_xmit, .hard_start_xmit = loopback_xmit,
.hard_header = eth_header, .hard_header = eth_header,
@ -221,16 +228,6 @@ struct net_device loopback_dev = {
/* Setup and register the loopback device. */ /* Setup and register the loopback device. */
int __init loopback_init(void) int __init loopback_init(void)
{ {
struct net_device_stats *stats;
/* Can survive without statistics */
stats = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
if (stats) {
memset(stats, 0, sizeof(struct net_device_stats));
loopback_dev.priv = stats;
loopback_dev.get_stats = &get_stats;
}
return register_netdev(&loopback_dev); return register_netdev(&loopback_dev);
}; };