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[NET] loopback: minor statistics optimization
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>
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@ -161,15 +161,13 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
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return(0);
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}
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static struct net_device_stats loopback_stats;
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static struct net_device_stats *get_stats(struct net_device *dev)
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{
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struct net_device_stats *stats = dev->priv;
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struct net_device_stats *stats = &loopback_stats;
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int i;
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if (!stats) {
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return NULL;
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}
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memset(stats, 0, sizeof(struct net_device_stats));
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for_each_possible_cpu(i) {
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@ -185,19 +183,28 @@ static struct net_device_stats *get_stats(struct net_device *dev)
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return stats;
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}
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static u32 loopback_get_link(struct net_device *dev)
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static u32 always_on(struct net_device *dev)
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{
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return 1;
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}
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static const struct ethtool_ops loopback_ethtool_ops = {
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.get_link = loopback_get_link,
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.get_link = always_on,
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.get_tso = ethtool_op_get_tso,
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.set_tso = ethtool_op_set_tso,
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.get_tx_csum = always_on,
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.get_sg = always_on,
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.get_rx_csum = always_on,
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};
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/*
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* The loopback device is special. There is only one instance and
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* it is statically allocated. Don't do this for other devices.
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*/
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struct net_device loopback_dev = {
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.name = "lo",
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.get_stats = &get_stats,
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.priv = &loopback_stats,
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.mtu = (16 * 1024) + 20 + 20 + 12,
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.hard_start_xmit = loopback_xmit,
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.hard_header = eth_header,
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@ -221,16 +228,6 @@ struct net_device loopback_dev = {
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/* Setup and register the loopback device. */
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int __init loopback_init(void)
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{
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struct net_device_stats *stats;
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/* Can survive without statistics */
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stats = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL);
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if (stats) {
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memset(stats, 0, sizeof(struct net_device_stats));
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loopback_dev.priv = stats;
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loopback_dev.get_stats = &get_stats;
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}
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return register_netdev(&loopback_dev);
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};
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