#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/percpu.h>
+#include <net/net_namespace.h>
-static DEFINE_PER_CPU(struct net_device_stats, loopback_stats);
-
-#define LOOPBACK_OVERHEAD (128 + MAX_HEADER + 16 + 16)
+struct pcpu_lstats {
+ unsigned long packets;
+ unsigned long bytes;
+};
/* KISS: just allocate small chunks and copy bits.
*
#ifdef LOOPBACK_TSO
static void emulate_large_send_offload(struct sk_buff *skb)
{
- struct iphdr *iph = skb->nh.iph;
- struct tcphdr *th = (struct tcphdr*)(skb->nh.raw + (iph->ihl * 4));
+ struct iphdr *iph = ip_hdr(skb);
+ struct tcphdr *th = (struct tcphdr *)(skb_network_header(skb) +
+ (iph->ihl * 4));
unsigned int doffset = (iph->ihl + th->doff) * 4;
- unsigned int mtu = skb_shinfo(skb)->tso_size + doffset;
+ unsigned int mtu = skb_shinfo(skb)->gso_size + doffset;
unsigned int offset = 0;
u32 seq = ntohl(th->seq);
u16 id = ntohs(iph->id);
if (!nskb)
break;
skb_reserve(nskb, 32);
- nskb->mac.raw = nskb->data - 14;
- nskb->nh.raw = nskb->data;
- iph = nskb->nh.iph;
- memcpy(nskb->data, skb->nh.raw, doffset);
+ skb_set_mac_header(nskb, -ETH_HLEN);
+ skb_reset_network_header(nskb);
+ iph = ip_hdr(nskb);
+ skb_copy_to_linear_data(nskb, skb_network_header(skb),
+ doffset);
if (skb_copy_bits(skb,
doffset + offset,
nskb->data + doffset,
memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
nskb->pkt_type = skb->pkt_type;
- th = (struct tcphdr*)(nskb->nh.raw + iph->ihl*4);
+ th = (struct tcphdr *)(skb_network_header(nskb) + iph->ihl * 4);
iph->tot_len = htons(frag_size + doffset);
iph->id = htons(id);
iph->check = 0;
*/
static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
{
- struct net_device_stats *lb_stats;
+ struct pcpu_lstats *pcpu_lstats, *lb_stats;
skb_orphan(skb);
- skb->protocol=eth_type_trans(skb,dev);
- skb->dev=dev;
+ skb->protocol = eth_type_trans(skb,dev);
#ifndef LOOPBACK_MUST_CHECKSUM
skb->ip_summed = CHECKSUM_UNNECESSARY;
#endif
#ifdef LOOPBACK_TSO
- if (skb_shinfo(skb)->tso_size) {
+ if (skb_is_gso(skb)) {
BUG_ON(skb->protocol != htons(ETH_P_IP));
- BUG_ON(skb->nh.iph->protocol != IPPROTO_TCP);
+ BUG_ON(ip_hdr(skb)->protocol != IPPROTO_TCP);
emulate_large_send_offload(skb);
return 0;
#endif
dev->last_rx = jiffies;
- lb_stats = &per_cpu(loopback_stats, get_cpu());
- lb_stats->rx_bytes += skb->len;
- lb_stats->tx_bytes = lb_stats->rx_bytes;
- lb_stats->rx_packets++;
- lb_stats->tx_packets = lb_stats->rx_packets;
- put_cpu();
+ /* it's OK to use per_cpu_ptr() because BHs are off */
+ pcpu_lstats = dev->ml_priv;
+ lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id());
+ lb_stats->bytes += skb->len;
+ lb_stats->packets++;
netif_rx(skb);
- return(0);
+ return 0;
}
static struct net_device_stats *get_stats(struct net_device *dev)
{
- struct net_device_stats *stats = dev->priv;
+ const struct pcpu_lstats *pcpu_lstats;
+ struct net_device_stats *stats = &dev->stats;
+ unsigned long bytes = 0;
+ unsigned long packets = 0;
int i;
- if (!stats) {
- return NULL;
- }
-
- memset(stats, 0, sizeof(struct net_device_stats));
-
- for (i=0; i < NR_CPUS; i++) {
- struct net_device_stats *lb_stats;
+ pcpu_lstats = dev->ml_priv;
+ for_each_possible_cpu(i) {
+ const struct pcpu_lstats *lb_stats;
- if (!cpu_possible(i))
- continue;
- lb_stats = &per_cpu(loopback_stats, i);
- stats->rx_bytes += lb_stats->rx_bytes;
- stats->tx_bytes += lb_stats->tx_bytes;
- stats->rx_packets += lb_stats->rx_packets;
- stats->tx_packets += lb_stats->tx_packets;
+ lb_stats = per_cpu_ptr(pcpu_lstats, i);
+ bytes += lb_stats->bytes;
+ packets += lb_stats->packets;
}
-
+ stats->rx_packets = packets;
+ stats->tx_packets = packets;
+ stats->rx_bytes = bytes;
+ stats->tx_bytes = bytes;
return stats;
}
-static u32 loopback_get_link(struct net_device *dev)
+static u32 always_on(struct net_device *dev)
{
return 1;
}
-static struct ethtool_ops loopback_ethtool_ops = {
- .get_link = loopback_get_link,
- .get_tso = ethtool_op_get_tso,
+static const struct ethtool_ops loopback_ethtool_ops = {
+ .get_link = always_on,
.set_tso = ethtool_op_set_tso,
+ .get_tx_csum = always_on,
+ .get_sg = always_on,
+ .get_rx_csum = always_on,
};
-struct net_device loopback_dev = {
- .name = "lo",
- .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 int loopback_dev_init(struct net_device *dev)
+{
+ struct pcpu_lstats *lstats;
+
+ lstats = alloc_percpu(struct pcpu_lstats);
+ if (!lstats)
+ return -ENOMEM;
+
+ dev->ml_priv = lstats;
+ return 0;
+}
+
+static void loopback_dev_free(struct net_device *dev)
+{
+ struct pcpu_lstats *lstats = dev->ml_priv;
+
+ free_percpu(lstats);
+ free_netdev(dev);
+}
+
+/*
+ * The loopback device is special. There is only one instance
+ * per network namespace.
+ */
+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 of the LOOPBACK device. */
-int __init loopback_init(void)
+/* Setup and register the loopback device. */
+static __net_init int loopback_net_init(struct net *net)
{
- 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);
+ struct net_device *dev;
+ int err;
+
+ err = -ENOMEM;
+ dev = alloc_netdev(0, "lo", loopback_setup);
+ if (!dev)
+ goto out;
+
+ dev_net_set(dev, net);
+ err = register_netdev(dev);
+ if (err)
+ goto out_free_netdev;
+
+ net->loopback_dev = dev;
+ return 0;
+
+
+out_free_netdev:
+ free_netdev(dev);
+out:
+ if (net == &init_net)
+ panic("loopback: Failed to register netdevice: %d\n", err);
+ return err;
+}
+
+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,
};
-EXPORT_SYMBOL(loopback_dev);
+static int __init loopback_init(void)
+{
+ return register_pernet_device(&loopback_net_ops);
+}
+
+/* Loopback is special. It should be initialized before any other network
+ * device and network subsystem.
+ */
+fs_initcall(loopback_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff