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path: root/drivers/net/loopback.c
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Diffstat (limited to 'drivers/net/loopback.c')
-rw-r--r--drivers/net/loopback.c215
1 files changed, 70 insertions, 145 deletions
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index f2a6e713224..bb96409f8c0 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -39,9 +39,7 @@
#include <linux/errno.h>
#include <linux/fcntl.h>
#include <linux/in.h>
-#include <linux/init.h>
-#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
@@ -58,131 +56,72 @@
#include <linux/tcp.h>
#include <linux/percpu.h>
#include <net/net_namespace.h>
+#include <linux/u64_stats_sync.h>
struct pcpu_lstats {
- unsigned long packets;
- unsigned long bytes;
+ u64 packets;
+ u64 bytes;
+ struct u64_stats_sync syncp;
};
-/* 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 *pcpu_lstats, *lb_stats;
+ struct 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
-
-#ifdef LOOPBACK_TSO
- if (skb_is_gso(skb)) {
- BUG_ON(skb->protocol != htons(ETH_P_IP));
- BUG_ON(ip_hdr(skb)->protocol != IPPROTO_TCP);
+ /* Before queueing this packet to netif_rx(),
+ * make sure dst is refcounted.
+ */
+ skb_dst_force(skb);
- emulate_large_send_offload(skb);
- return 0;
- }
-#endif
- dev->last_rx = jiffies;
+ skb->protocol = eth_type_trans(skb, dev);
/* 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++;
-
- netif_rx(skb);
+ lb_stats = this_cpu_ptr(dev->lstats);
+
+ len = skb->len;
+ if (likely(netif_rx(skb) == NET_RX_SUCCESS)) {
+ u64_stats_update_begin(&lb_stats->syncp);
+ lb_stats->bytes += len;
+ lb_stats->packets++;
+ u64_stats_update_end(&lb_stats->syncp);
+ }
- return 0;
+ return NETDEV_TX_OK;
}
-static struct net_device_stats *get_stats(struct net_device *dev)
+static struct rtnl_link_stats64 *loopback_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *stats)
{
- const struct pcpu_lstats *pcpu_lstats;
- struct net_device_stats *stats = &dev->stats;
- unsigned long bytes = 0;
- unsigned long packets = 0;
+ u64 bytes = 0;
+ u64 packets = 0;
int i;
- pcpu_lstats = netdev_priv(dev);
for_each_possible_cpu(i) {
const struct pcpu_lstats *lb_stats;
-
- lb_stats = per_cpu_ptr(pcpu_lstats, i);
- bytes += lb_stats->bytes;
- packets += lb_stats->packets;
+ u64 tbytes, tpackets;
+ unsigned int start;
+
+ lb_stats = per_cpu_ptr(dev->lstats, i);
+ do {
+ start = u64_stats_fetch_begin_irq(&lb_stats->syncp);
+ tbytes = lb_stats->bytes;
+ tpackets = lb_stats->packets;
+ } while (u64_stats_fetch_retry_irq(&lb_stats->syncp, start));
+ bytes += tbytes;
+ packets += tpackets;
}
stats->rx_packets = packets;
stats->tx_packets = packets;
- stats->rx_bytes = bytes;
- stats->tx_bytes = bytes;
+ stats->rx_bytes = bytes;
+ stats->tx_bytes = bytes;
return stats;
}
@@ -193,58 +132,60 @@ static u32 always_on(struct net_device *dev)
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,
};
static int loopback_dev_init(struct net_device *dev)
{
- struct pcpu_lstats *lstats;
-
- lstats = alloc_percpu(struct pcpu_lstats);
- if (!lstats)
+ dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
+ if (!dev->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);
+ dev_net(dev)->loopback_dev = NULL;
+ free_percpu(dev->lstats);
free_netdev(dev);
}
+static const struct net_device_ops loopback_ops = {
+ .ndo_init = loopback_dev_init,
+ .ndo_start_xmit= loopback_xmit,
+ .ndo_get_stats64 = loopback_get_stats64,
+ .ndo_set_mac_address = eth_mac_addr,
+};
+
/*
* 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->mtu = 64 * 1024;
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_LIVE_ADDR_CHANGE;
+ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+ dev->hw_features = NETIF_F_ALL_TSO | NETIF_F_UFO;
dev->features = NETIF_F_SG | NETIF_F_FRAGLIST
-#ifdef LOOPBACK_TSO
- | NETIF_F_TSO
-#endif
- | NETIF_F_NO_CSUM
+ | NETIF_F_ALL_TSO
+ | NETIF_F_UFO
+ | NETIF_F_HW_CSUM
+ | NETIF_F_RXCSUM
+ | NETIF_F_SCTP_CSUM
| NETIF_F_HIGHDMA
| NETIF_F_LLTX
- | NETIF_F_NETNS_LOCAL;
+ | NETIF_F_NETNS_LOCAL
+ | NETIF_F_VLAN_CHALLENGED
+ | NETIF_F_LOOPBACK;
dev->ethtool_ops = &loopback_ethtool_ops;
dev->header_ops = &eth_header_ops;
- dev->init = loopback_dev_init;
- dev->destructor = loopback_dev_free;
+ dev->netdev_ops = &loopback_ops;
+ dev->destructor = loopback_dev_free;
}
/* Setup and register the loopback device. */
@@ -258,11 +199,12 @@ static __net_init int loopback_net_init(struct net *net)
if (!dev)
goto out;
- dev->nd_net = net;
+ dev_net_set(dev, net);
err = register_netdev(dev);
if (err)
goto out_free_netdev;
+ BUG_ON(dev->ifindex != LOOPBACK_IFINDEX);
net->loopback_dev = dev;
return 0;
@@ -270,29 +212,12 @@ static __net_init int loopback_net_init(struct net *net)
out_free_netdev:
free_netdev(dev);
out:
- if (net == &init_net)
+ if (net_eq(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 = {
+/* Registered in net/core/dev.c */
+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);
-}
-
-/* Loopback is special. It should be initialized before any other network
- * device and network subsystem.
- */
-fs_initcall(loopback_init);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 03:28:02 +0000