X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fnet%2Floopback.c;h=3b43bfd85a0f6dd3e1506d8a5a29e4ae85f3429e;hb=825b96708054ca16d6e4d56a29326d3b2cdd697d;hp=4b6f7b2abea5a8097075b69b3a431d85371c5fa4;hpb=854d8363f37491c955b0edc60d37b62f3d71bb67;p=safe%2Fjmp%2Flinux-2.6 diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c index 4b6f7b2..3b43bfd 100644 --- a/drivers/net/loopback.c +++ b/drivers/net/loopback.c @@ -57,76 +57,12 @@ #include #include #include +#include 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) - -/* 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 @@ -134,14 +70,11 @@ 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); skb->protocol = eth_type_trans(skb,dev); -#ifndef LOOPBACK_MUST_CHECKSUM - skb->ip_summed = CHECKSUM_UNNECESSARY; -#endif #ifdef LOOPBACK_TSO if (skb_is_gso(skb)) { @@ -154,8 +87,9 @@ 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 = dev->ml_priv; + lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id()); lb_stats->bytes += skb->len; lb_stats->packets++; @@ -166,15 +100,17 @@ 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 = 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; } @@ -198,37 +134,54 @@ static const struct ethtool_ops loopback_ethtool_ops = { .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); +} + /* - * 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. */ 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 = eth_header; - dev->hard_header_cache = eth_header_cache; - dev->header_cache_update = eth_header_cache_update; dev->hard_header_len = ETH_HLEN; /* 14 */ dev->addr_len = ETH_ALEN; /* 6 */ dev->tx_queue_len = 0; dev->type = ARPHRD_LOOPBACK; /* 0x0001*/ - dev->rebuild_header = eth_rebuild_header; dev->flags = IFF_LOOPBACK; dev->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, + | 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) { struct net_device *dev; int err; @@ -238,24 +191,41 @@ static int __init loopback_init(void) if (!dev) goto out; + dev_net_set(dev, net); err = register_netdev(dev); if (err) goto out_free_netdev; - err = 0; - loopback_dev = dev; + net->loopback_dev = dev; + return 0; + +out_free_netdev: + free_netdev(dev); out: - if (err) + if (net == &init_net) 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); } -fs_initcall(loopback_init); +static struct pernet_operations __net_initdata loopback_net_ops = { + .init = loopback_net_init, + .exit = loopback_net_exit, +}; + +static int __init loopback_init(void) +{ + return register_pernet_device(&loopback_net_ops); +} -struct net_device *loopback_dev; -EXPORT_SYMBOL(loopback_dev); +/* Loopback is special. It should be initialized before any other network + * device and network subsystem. + */ +fs_initcall(loopback_init);