#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;
+ unsigned long drops;
};
-static DEFINE_PER_CPU(struct pcpu_lstats, pcpu_lstats);
-
-#define LOOPBACK_OVERHEAD (128 + MAX_HEADER + 16 + 16)
-
-/* KISS: just allocate small chunks and copy bits.
- *
- * So, in fact, this is documentation, explaining what we expect
- * of largesending device modulo TCP checksum, which is ignored for loopback.
- */
-
-#ifdef LOOPBACK_TSO
-static void emulate_large_send_offload(struct sk_buff *skb)
-{
- 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)->gso_size + doffset;
- unsigned int offset = 0;
- u32 seq = ntohl(th->seq);
- u16 id = ntohs(iph->id);
-
- while (offset + doffset < skb->len) {
- unsigned int frag_size = min(mtu, skb->len - offset) - doffset;
- struct sk_buff *nskb = alloc_skb(mtu + 32, GFP_ATOMIC);
-
- if (!nskb)
- break;
- skb_reserve(nskb, 32);
- 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,
- frag_size))
- BUG();
- skb_put(nskb, doffset + frag_size);
- nskb->ip_summed = CHECKSUM_UNNECESSARY;
- nskb->dev = skb->dev;
- nskb->priority = skb->priority;
- nskb->protocol = skb->protocol;
- nskb->dst = dst_clone(skb->dst);
- memcpy(nskb->cb, skb->cb, sizeof(skb->cb));
- nskb->pkt_type = skb->pkt_type;
-
- th = (struct tcphdr *)(skb_network_header(nskb) + iph->ihl * 4);
- iph->tot_len = htons(frag_size + doffset);
- iph->id = htons(id);
- iph->check = 0;
- iph->check = ip_fast_csum((unsigned char *) iph, iph->ihl);
- th->seq = htonl(seq);
- if (offset + doffset + frag_size < skb->len)
- th->fin = th->psh = 0;
- netif_rx(nskb);
- offset += frag_size;
- seq += frag_size;
- id++;
- }
-
- dev_kfree_skb(skb);
-}
-#endif /* LOOPBACK_TSO */
/*
* The higher levels take care of making this non-reentrant (it's
* called with bh's disabled).
*/
-static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
+static netdev_tx_t loopback_xmit(struct sk_buff *skb,
+ struct net_device *dev)
{
- struct pcpu_lstats *lb_stats;
+ struct pcpu_lstats *pcpu_lstats, *lb_stats;
+ int len;
skb_orphan(skb);
- skb->protocol = eth_type_trans(skb,dev);
-#ifndef LOOPBACK_MUST_CHECKSUM
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-#endif
+ skb->protocol = eth_type_trans(skb, dev);
-#ifdef LOOPBACK_TSO
- if (skb_is_gso(skb)) {
- BUG_ON(skb->protocol != htons(ETH_P_IP));
- BUG_ON(ip_hdr(skb)->protocol != IPPROTO_TCP);
+ /* it's OK to use per_cpu_ptr() because BHs are off */
+ pcpu_lstats = dev->ml_priv;
+ lb_stats = this_cpu_ptr(pcpu_lstats);
- emulate_large_send_offload(skb);
- return 0;
- }
-#endif
- dev->last_rx = jiffies;
+ len = skb->len;
+ if (likely(netif_rx(skb) == NET_RX_SUCCESS)) {
+ lb_stats->bytes += len;
+ lb_stats->packets++;
+ } else
+ lb_stats->drops++;
- /* it's OK to use __get_cpu_var() because BHs are off */
- lb_stats = &__get_cpu_var(pcpu_lstats);
- lb_stats->bytes += skb->len;
- lb_stats->packets++;
-
- netif_rx(skb);
-
- return 0;
+ return NETDEV_TX_OK;
}
-static struct net_device_stats *get_stats(struct net_device *dev)
+static struct net_device_stats *loopback_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;
+ unsigned long drops = 0;
int i;
+ pcpu_lstats = dev->ml_priv;
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;
+ drops += lb_stats->drops;
}
stats->rx_packets = packets;
stats->tx_packets = packets;
- stats->rx_bytes = bytes;
- stats->tx_bytes = bytes;
+ stats->rx_dropped = drops;
+ stats->rx_errors = drops;
+ stats->rx_bytes = bytes;
+ stats->tx_bytes = bytes;
return stats;
}
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->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);
+}
+
+static const struct net_device_ops loopback_ops = {
+ .ndo_init = loopback_dev_init,
+ .ndo_start_xmit= loopback_xmit,
+ .ndo_get_stats = loopback_get_stats,
+};
+
/*
- * 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
-#ifdef LOOPBACK_TSO
- | NETIF_F_TSO
-#endif
- | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA
- | NETIF_F_LLTX
- | NETIF_F_NETNS_LOCAL,
- .ethtool_ops = &loopback_ethtool_ops,
- .nd_net = &init_net,
-};
+static void loopback_setup(struct net_device *dev)
+{
+ dev->mtu = (16 * 1024) + 20 + 20 + 12;
+ 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->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+ dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
+ | NETIF_F_TSO
+ | 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->netdev_ops = &loopback_ops;
+ 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)
{
- int err = 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)
- panic("loopback: Failed to register netdevice: %d\n", err);
+ goto out_free_netdev;
- return err;
-};
+ net->loopback_dev = dev;
+ return 0;
-module_init(loopback_init);
-EXPORT_SYMBOL(loopback_dev);
+out_free_netdev:
+ free_netdev(dev);
+out:
+ if (net_eq(net, &init_net))
+ panic("loopback: Failed to register netdevice: %d\n", err);
+ return err;
+}
+
+/* Registered in net/core/dev.c */
+struct pernet_operations __net_initdata loopback_net_ops = {
+ .init = loopback_net_init,
+};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff