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![WANG Cong](/assets/img/avatar_default.png)
It is trivial to add netpoll support to veth, since it is not a stacked device, we don't need to setup and clean up netpoll. Reported-by: Stefan Priebe <s.priebe@profihost.ag> Cc: "David S. Miller" <davem@davemloft.net> Cc: Neil Horman <nhorman@tuxdriver.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
497 lines
11 KiB
C
497 lines
11 KiB
C
/*
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* drivers/net/veth.c
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*
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* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
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*
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* Author: Pavel Emelianov <xemul@openvz.org>
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* Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
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*
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*/
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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#include <linux/u64_stats_sync.h>
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#include <net/rtnetlink.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include <linux/veth.h>
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#include <linux/module.h>
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#define DRV_NAME "veth"
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#define DRV_VERSION "1.0"
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#define MIN_MTU 68 /* Min L3 MTU */
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#define MAX_MTU 65535 /* Max L3 MTU (arbitrary) */
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struct pcpu_vstats {
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u64 packets;
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u64 bytes;
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struct u64_stats_sync syncp;
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};
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struct veth_priv {
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struct net_device __rcu *peer;
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atomic64_t dropped;
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};
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/*
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* ethtool interface
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*/
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static struct {
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const char string[ETH_GSTRING_LEN];
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} ethtool_stats_keys[] = {
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{ "peer_ifindex" },
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};
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static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
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{
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cmd->supported = 0;
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cmd->advertising = 0;
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ethtool_cmd_speed_set(cmd, SPEED_10000);
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cmd->duplex = DUPLEX_FULL;
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cmd->port = PORT_TP;
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cmd->phy_address = 0;
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cmd->transceiver = XCVR_INTERNAL;
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cmd->autoneg = AUTONEG_DISABLE;
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cmd->maxtxpkt = 0;
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cmd->maxrxpkt = 0;
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return 0;
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}
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static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
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{
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strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
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strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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}
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static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
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{
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switch(stringset) {
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case ETH_SS_STATS:
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memcpy(buf, ðtool_stats_keys, sizeof(ethtool_stats_keys));
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break;
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}
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}
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static int veth_get_sset_count(struct net_device *dev, int sset)
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{
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switch (sset) {
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case ETH_SS_STATS:
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return ARRAY_SIZE(ethtool_stats_keys);
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default:
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return -EOPNOTSUPP;
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}
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}
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static void veth_get_ethtool_stats(struct net_device *dev,
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struct ethtool_stats *stats, u64 *data)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer = rtnl_dereference(priv->peer);
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data[0] = peer ? peer->ifindex : 0;
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}
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static const struct ethtool_ops veth_ethtool_ops = {
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.get_settings = veth_get_settings,
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.get_drvinfo = veth_get_drvinfo,
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.get_link = ethtool_op_get_link,
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.get_strings = veth_get_strings,
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.get_sset_count = veth_get_sset_count,
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.get_ethtool_stats = veth_get_ethtool_stats,
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};
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static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *rcv;
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int length = skb->len;
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rcu_read_lock();
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rcv = rcu_dereference(priv->peer);
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if (unlikely(!rcv)) {
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kfree_skb(skb);
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goto drop;
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}
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/* don't change ip_summed == CHECKSUM_PARTIAL, as that
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* will cause bad checksum on forwarded packets
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*/
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if (skb->ip_summed == CHECKSUM_NONE &&
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rcv->features & NETIF_F_RXCSUM)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
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struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
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u64_stats_update_begin(&stats->syncp);
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stats->bytes += length;
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stats->packets++;
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u64_stats_update_end(&stats->syncp);
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} else {
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drop:
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atomic64_inc(&priv->dropped);
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}
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rcu_read_unlock();
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return NETDEV_TX_OK;
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}
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/*
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* general routines
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*/
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static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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int cpu;
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result->packets = 0;
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result->bytes = 0;
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for_each_possible_cpu(cpu) {
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struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
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u64 packets, bytes;
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unsigned int start;
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do {
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start = u64_stats_fetch_begin_irq(&stats->syncp);
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packets = stats->packets;
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bytes = stats->bytes;
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} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
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result->packets += packets;
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result->bytes += bytes;
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}
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return atomic64_read(&priv->dropped);
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}
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static struct rtnl_link_stats64 *veth_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *tot)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer;
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struct pcpu_vstats one;
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tot->tx_dropped = veth_stats_one(&one, dev);
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tot->tx_bytes = one.bytes;
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tot->tx_packets = one.packets;
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rcu_read_lock();
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peer = rcu_dereference(priv->peer);
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if (peer) {
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tot->rx_dropped = veth_stats_one(&one, peer);
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tot->rx_bytes = one.bytes;
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tot->rx_packets = one.packets;
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}
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rcu_read_unlock();
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return tot;
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}
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/* fake multicast ability */
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static void veth_set_multicast_list(struct net_device *dev)
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{
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}
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static int veth_open(struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer = rtnl_dereference(priv->peer);
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if (!peer)
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return -ENOTCONN;
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if (peer->flags & IFF_UP) {
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netif_carrier_on(dev);
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netif_carrier_on(peer);
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}
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return 0;
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}
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static int veth_close(struct net_device *dev)
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{
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struct veth_priv *priv = netdev_priv(dev);
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struct net_device *peer = rtnl_dereference(priv->peer);
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netif_carrier_off(dev);
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if (peer)
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netif_carrier_off(peer);
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return 0;
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}
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static int is_valid_veth_mtu(int new_mtu)
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{
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return new_mtu >= MIN_MTU && new_mtu <= MAX_MTU;
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}
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static int veth_change_mtu(struct net_device *dev, int new_mtu)
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{
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if (!is_valid_veth_mtu(new_mtu))
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return -EINVAL;
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dev->mtu = new_mtu;
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return 0;
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}
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static int veth_dev_init(struct net_device *dev)
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{
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dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
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if (!dev->vstats)
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return -ENOMEM;
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return 0;
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}
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static void veth_dev_free(struct net_device *dev)
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{
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free_percpu(dev->vstats);
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free_netdev(dev);
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}
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#ifdef CONFIG_NET_POLL_CONTROLLER
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static void veth_poll_controller(struct net_device *dev)
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{
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/* veth only receives frames when its peer sends one
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* Since it's a synchronous operation, we are guaranteed
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* never to have pending data when we poll for it so
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* there is nothing to do here.
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*
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* We need this though so netpoll recognizes us as an interface that
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* supports polling, which enables bridge devices in virt setups to
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* still use netconsole
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*/
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}
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#endif /* CONFIG_NET_POLL_CONTROLLER */
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static const struct net_device_ops veth_netdev_ops = {
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.ndo_init = veth_dev_init,
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.ndo_open = veth_open,
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.ndo_stop = veth_close,
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.ndo_start_xmit = veth_xmit,
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.ndo_change_mtu = veth_change_mtu,
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.ndo_get_stats64 = veth_get_stats64,
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.ndo_set_rx_mode = veth_set_multicast_list,
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.ndo_set_mac_address = eth_mac_addr,
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#ifdef CONFIG_NET_POLL_CONTROLLER
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.ndo_poll_controller = veth_poll_controller,
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#endif
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};
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#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
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NETIF_F_HW_CSUM | NETIF_F_RXCSUM | NETIF_F_HIGHDMA | \
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NETIF_F_GSO_GRE | NETIF_F_GSO_UDP_TUNNEL | \
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NETIF_F_GSO_IPIP | NETIF_F_GSO_SIT | NETIF_F_UFO | \
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NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
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NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
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static void veth_setup(struct net_device *dev)
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{
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ether_setup(dev);
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dev->priv_flags &= ~IFF_TX_SKB_SHARING;
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dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
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dev->netdev_ops = &veth_netdev_ops;
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dev->ethtool_ops = &veth_ethtool_ops;
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dev->features |= NETIF_F_LLTX;
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dev->features |= VETH_FEATURES;
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dev->vlan_features = dev->features &
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~(NETIF_F_HW_VLAN_CTAG_TX |
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NETIF_F_HW_VLAN_STAG_TX |
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NETIF_F_HW_VLAN_CTAG_RX |
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NETIF_F_HW_VLAN_STAG_RX);
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dev->destructor = veth_dev_free;
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dev->hw_features = VETH_FEATURES;
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dev->hw_enc_features = VETH_FEATURES;
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}
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/*
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* netlink interface
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*/
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static int veth_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
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return -EINVAL;
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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}
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if (tb[IFLA_MTU]) {
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if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
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return -EINVAL;
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}
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return 0;
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}
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static struct rtnl_link_ops veth_link_ops;
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static int veth_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[])
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{
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int err;
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struct net_device *peer;
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struct veth_priv *priv;
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char ifname[IFNAMSIZ];
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struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
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struct ifinfomsg *ifmp;
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struct net *net;
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/*
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* create and register peer first
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*/
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if (data != NULL && data[VETH_INFO_PEER] != NULL) {
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struct nlattr *nla_peer;
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nla_peer = data[VETH_INFO_PEER];
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ifmp = nla_data(nla_peer);
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err = rtnl_nla_parse_ifla(peer_tb,
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nla_data(nla_peer) + sizeof(struct ifinfomsg),
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nla_len(nla_peer) - sizeof(struct ifinfomsg));
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if (err < 0)
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return err;
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err = veth_validate(peer_tb, NULL);
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if (err < 0)
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return err;
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tbp = peer_tb;
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} else {
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ifmp = NULL;
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tbp = tb;
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}
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if (tbp[IFLA_IFNAME])
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nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
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else
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snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
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net = rtnl_link_get_net(src_net, tbp);
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if (IS_ERR(net))
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return PTR_ERR(net);
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peer = rtnl_create_link(net, ifname, &veth_link_ops, tbp);
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if (IS_ERR(peer)) {
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put_net(net);
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return PTR_ERR(peer);
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}
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if (tbp[IFLA_ADDRESS] == NULL)
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eth_hw_addr_random(peer);
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if (ifmp && (dev->ifindex != 0))
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peer->ifindex = ifmp->ifi_index;
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err = register_netdevice(peer);
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put_net(net);
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net = NULL;
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if (err < 0)
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goto err_register_peer;
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netif_carrier_off(peer);
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err = rtnl_configure_link(peer, ifmp);
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if (err < 0)
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goto err_configure_peer;
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/*
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* register dev last
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*
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* note, that since we've registered new device the dev's name
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* should be re-allocated
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*/
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if (tb[IFLA_ADDRESS] == NULL)
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eth_hw_addr_random(dev);
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if (tb[IFLA_IFNAME])
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nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
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else
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snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
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err = register_netdevice(dev);
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if (err < 0)
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goto err_register_dev;
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netif_carrier_off(dev);
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/*
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* tie the deviced together
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*/
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priv = netdev_priv(dev);
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rcu_assign_pointer(priv->peer, peer);
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priv = netdev_priv(peer);
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rcu_assign_pointer(priv->peer, dev);
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return 0;
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err_register_dev:
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/* nothing to do */
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err_configure_peer:
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unregister_netdevice(peer);
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return err;
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err_register_peer:
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free_netdev(peer);
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return err;
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}
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static void veth_dellink(struct net_device *dev, struct list_head *head)
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{
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struct veth_priv *priv;
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struct net_device *peer;
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priv = netdev_priv(dev);
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peer = rtnl_dereference(priv->peer);
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/* Note : dellink() is called from default_device_exit_batch(),
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* before a rcu_synchronize() point. The devices are guaranteed
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* not being freed before one RCU grace period.
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*/
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RCU_INIT_POINTER(priv->peer, NULL);
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unregister_netdevice_queue(dev, head);
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if (peer) {
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priv = netdev_priv(peer);
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RCU_INIT_POINTER(priv->peer, NULL);
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unregister_netdevice_queue(peer, head);
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}
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}
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static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
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[VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
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};
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static struct rtnl_link_ops veth_link_ops = {
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.kind = DRV_NAME,
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.priv_size = sizeof(struct veth_priv),
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.setup = veth_setup,
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.validate = veth_validate,
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.newlink = veth_newlink,
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.dellink = veth_dellink,
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.policy = veth_policy,
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.maxtype = VETH_INFO_MAX,
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};
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/*
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* init/fini
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*/
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static __init int veth_init(void)
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{
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return rtnl_link_register(&veth_link_ops);
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}
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static __exit void veth_exit(void)
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{
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rtnl_link_unregister(&veth_link_ops);
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}
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module_init(veth_init);
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module_exit(veth_exit);
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MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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