diff options
Diffstat (limited to 'drivers/net/loopback.c')
| -rw-r--r-- | drivers/net/loopback.c | 128 |
1 files changed, 96 insertions, 32 deletions
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c index 6ba6ed2b480..be25aa33971 100644 --- a/drivers/net/loopback.c +++ b/drivers/net/loopback.c @@ -57,12 +57,12 @@ #include <linux/ip.h> #include <linux/tcp.h> #include <linux/percpu.h> +#include <net/net_namespace.h> 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 +134,7 @@ 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); @@ -154,8 +154,9 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev) #endif dev->last_rx = jiffies; - /* it's OK to use __get_cpu_var() because BHs are off */ - lb_stats = &__get_cpu_var(pcpu_lstats); + /* it's OK to use per_cpu_ptr() because BHs are off */ + 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 +167,17 @@ 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; } @@ -192,46 +195,107 @@ static u32 always_on(struct net_device *dev) static const struct ethtool_ops loopback_ethtool_ops = { .get_link = always_on, - .get_tso = ethtool_op_get_tso, .set_tso = ethtool_op_set_tso, .get_tx_csum = always_on, .get_sg = always_on, .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. + * The loopback device is special. There is only one instance + * per network namespace. */ -struct net_device loopback_dev = { - .name = "lo", - .get_stats = &get_stats, - .mtu = (16 * 1024) + 20 + 20 + 12, - .hard_start_xmit = loopback_xmit, - .hard_header = eth_header, - .hard_header_cache = eth_header_cache, - .header_cache_update = eth_header_cache_update, - .hard_header_len = ETH_HLEN, /* 14 */ - .addr_len = ETH_ALEN, /* 6 */ - .tx_queue_len = 0, - .type = ARPHRD_LOOPBACK, /* 0x0001*/ - .rebuild_header = eth_rebuild_header, - .flags = IFF_LOOPBACK, - .features = NETIF_F_SG | NETIF_F_FRAGLIST +static void loopback_setup(struct net_device *dev) +{ + dev->get_stats = &get_stats; + dev->mtu = (16 * 1024) + 20 + 20 + 12; + dev->hard_start_xmit = loopback_xmit; + dev->hard_header_len = ETH_HLEN; /* 14 */ + dev->addr_len = ETH_ALEN; /* 6 */ + dev->tx_queue_len = 0; + dev->type = ARPHRD_LOOPBACK; /* 0x0001*/ + dev->flags = IFF_LOOPBACK; + dev->features = NETIF_F_SG | NETIF_F_FRAGLIST #ifdef LOOPBACK_TSO - | NETIF_F_TSO + | NETIF_F_TSO #endif - | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA - | NETIF_F_LLTX, - .ethtool_ops = &loopback_ethtool_ops, -}; + | NETIF_F_NO_CSUM + | NETIF_F_HIGHDMA + | NETIF_F_LLTX + | NETIF_F_NETNS_LOCAL, + dev->ethtool_ops = &loopback_ethtool_ops; + dev->header_ops = ð_header_ops; + dev->init = loopback_dev_init; + dev->destructor = loopback_dev_free; +} /* Setup and register the loopback device. */ -static int __init loopback_init(void) +static __net_init int loopback_net_init(struct net *net) { - return register_netdev(&loopback_dev); + struct net_device *dev; + int err; + + err = -ENOMEM; + dev = alloc_netdev(0, "lo", loopback_setup); + if (!dev) + goto out; + + dev->nd_net = net; + err = register_netdev(dev); + if (err) + goto out_free_netdev; + + err = 0; + net->loopback_dev = dev; + +out: + if (err) + panic("loopback: Failed to register netdevice: %d\n", err); + return err; + +out_free_netdev: + free_netdev(dev); + goto out; +} + +static __net_exit void loopback_net_exit(struct net *net) +{ + struct net_device *dev = net->loopback_dev; + + unregister_netdev(dev); +} + +static struct pernet_operations __net_initdata loopback_net_ops = { + .init = loopback_net_init, + .exit = loopback_net_exit, }; -module_init(loopback_init); +static int __init loopback_init(void) +{ + return register_pernet_device(&loopback_net_ops); +} -EXPORT_SYMBOL(loopback_dev); +/* Loopback is special. It should be initialized before any other network + * device and network subsystem. + */ +fs_initcall(loopback_init); |