fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / drivers / net / loopback.c

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 1885bfe..2b739fd 100644 (file)
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -7,7 +7,7 @@
  *
  * Version:    @(#)loopback.c  1.0.4b  08/16/93
  *
- * Authors:    Ross Biro, <bir7@leland.Stanford.Edu>
+ * Authors:    Ross Biro
  *             Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  *             Donald Becker, <becker@scyld.com>
  *
@@ -49,13 +49,20 @@
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/skbuff.h>
+#include <linux/ethtool.h>
 #include <net/sock.h>
 #include <net/checksum.h>
 #include <linux/if_ether.h>    /* For the statistics structure. */
 #include <linux/if_arp.h>      /* For ARPHRD_ETHER */
 #include <linux/ip.h>
 #include <linux/tcp.h>
+#include <linux/percpu.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)
 
@@ -65,12 +72,13 @@
  * 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 = skb->nh.iph;
        struct tcphdr *th = (struct tcphdr*)(skb->nh.raw + (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);
@@ -116,6 +124,7 @@ static void emulate_large_send_offload(struct sk_buff *skb)
 
        dev_kfree_skb(skb);
 }
+#endif /* LOOPBACK_TSO */
 
 /*
  * The higher levels take care of making this non-reentrant (it's
@@ -123,44 +132,82 @@ static void emulate_large_send_offload(struct sk_buff *skb)
  */
 static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
 {
-       struct net_device_stats *stats = dev->priv;
+       struct pcpu_lstats *lb_stats;
 
        skb_orphan(skb);
 
-       skb->protocol=eth_type_trans(skb,dev);
-       skb->dev=dev;
+       skb->protocol = eth_type_trans(skb,dev);
+       skb->dev = dev;
 #ifndef LOOPBACK_MUST_CHECKSUM
        skb->ip_summed = CHECKSUM_UNNECESSARY;
 #endif
 
-       if (skb_shinfo(skb)->tso_size) {
+#ifdef LOOPBACK_TSO
+       if (skb_is_gso(skb)) {
                BUG_ON(skb->protocol != htons(ETH_P_IP));
                BUG_ON(skb->nh.iph->protocol != IPPROTO_TCP);
 
                emulate_large_send_offload(skb);
                return 0;
        }
-
+#endif
        dev->last_rx = jiffies;
-       if (likely(stats)) {
-               stats->rx_bytes+=skb->len;
-               stats->tx_bytes+=skb->len;
-               stats->rx_packets++;
-               stats->tx_packets++;
-       }
+
+       /* 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 0;
 }
 
+static struct net_device_stats loopback_stats;
+
 static struct net_device_stats *get_stats(struct net_device *dev)
 {
-       return (struct net_device_stats *)dev->priv;
+       struct net_device_stats *stats = &loopback_stats;
+       unsigned long bytes = 0;
+       unsigned long packets = 0;
+       int i;
+
+       for_each_possible_cpu(i) {
+               const struct pcpu_lstats *lb_stats;
+
+               lb_stats = &per_cpu(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 always_on(struct net_device *dev)
+{
+       return 1;
+}
+
+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,
+};
+
+/*
+ * The loopback device is special. There is only one instance and
+ * it is statically allocated. Don't do this for other devices.
+ */
 struct net_device loopback_dev = {
        .name                   = "lo",
+       .get_stats              = &get_stats,
+       .priv                   = &loopback_stats,
        .mtu                    = (16 * 1024) + 20 + 20 + 12,
        .hard_start_xmit        = loopback_xmit,
        .hard_header            = eth_header,
@@ -172,24 +219,21 @@ struct net_device loopback_dev = {
        .type                   = ARPHRD_LOOPBACK,      /* 0x0001*/
        .rebuild_header         = eth_rebuild_header,
        .flags                  = IFF_LOOPBACK,
-       .features               = NETIF_F_SG|NETIF_F_FRAGLIST
-                                 |NETIF_F_NO_CSUM|NETIF_F_HIGHDMA,
+       .features               = NETIF_F_SG | NETIF_F_FRAGLIST
+#ifdef LOOPBACK_TSO
+                                 | NETIF_F_TSO
+#endif
+                                 | NETIF_F_NO_CSUM | NETIF_F_HIGHDMA
+                                 | NETIF_F_LLTX,
+       .ethtool_ops            = &loopback_ethtool_ops,
 };
 
-/* Setup and register the of the LOOPBACK device. */
-int __init loopback_init(void)
+/* Setup and register the loopback device. */
+static int __init loopback_init(void)
 {
-       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);
 };
 
+module_init(loopback_init);
+
 EXPORT_SYMBOL(loopback_dev);