297 lines
6.9 KiB
C
297 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2007-2012 Nicira, Inc.
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*/
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#include <linux/if_vlan.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/skbuff.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include <net/rtnetlink.h>
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#include "datapath.h"
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#include "vport-internal_dev.h"
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#include "vport-netdev.h"
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struct internal_dev {
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struct vport *vport;
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};
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static struct vport_ops ovs_internal_vport_ops;
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static struct internal_dev *internal_dev_priv(struct net_device *netdev)
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{
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return netdev_priv(netdev);
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}
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/* Called with rcu_read_lock_bh. */
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static netdev_tx_t
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internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
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{
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int len, err;
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len = skb->len;
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rcu_read_lock();
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err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
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rcu_read_unlock();
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if (likely(!err)) {
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struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
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u64_stats_update_begin(&tstats->syncp);
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tstats->tx_bytes += len;
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tstats->tx_packets++;
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u64_stats_update_end(&tstats->syncp);
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} else {
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netdev->stats.tx_errors++;
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}
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return NETDEV_TX_OK;
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}
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static int internal_dev_open(struct net_device *netdev)
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{
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netif_start_queue(netdev);
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return 0;
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}
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static int internal_dev_stop(struct net_device *netdev)
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{
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netif_stop_queue(netdev);
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return 0;
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}
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static void internal_dev_getinfo(struct net_device *netdev,
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struct ethtool_drvinfo *info)
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{
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strlcpy(info->driver, "openvswitch", sizeof(info->driver));
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}
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static const struct ethtool_ops internal_dev_ethtool_ops = {
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.get_drvinfo = internal_dev_getinfo,
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.get_link = ethtool_op_get_link,
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};
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static void internal_dev_destructor(struct net_device *dev)
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{
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struct vport *vport = ovs_internal_dev_get_vport(dev);
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ovs_vport_free(vport);
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}
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static void
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internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
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{
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int i;
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memset(stats, 0, sizeof(*stats));
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stats->rx_errors = dev->stats.rx_errors;
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stats->tx_errors = dev->stats.tx_errors;
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stats->tx_dropped = dev->stats.tx_dropped;
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stats->rx_dropped = dev->stats.rx_dropped;
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for_each_possible_cpu(i) {
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const struct pcpu_sw_netstats *percpu_stats;
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struct pcpu_sw_netstats local_stats;
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unsigned int start;
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percpu_stats = per_cpu_ptr(dev->tstats, i);
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do {
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start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
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local_stats = *percpu_stats;
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} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
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stats->rx_bytes += local_stats.rx_bytes;
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stats->rx_packets += local_stats.rx_packets;
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stats->tx_bytes += local_stats.tx_bytes;
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stats->tx_packets += local_stats.tx_packets;
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}
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}
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static const struct net_device_ops internal_dev_netdev_ops = {
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.ndo_open = internal_dev_open,
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.ndo_stop = internal_dev_stop,
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.ndo_start_xmit = internal_dev_xmit,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_get_stats64 = internal_get_stats,
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};
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static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
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.kind = "openvswitch",
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};
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static void do_setup(struct net_device *netdev)
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{
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ether_setup(netdev);
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netdev->max_mtu = ETH_MAX_MTU;
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netdev->netdev_ops = &internal_dev_netdev_ops;
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netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
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netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
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IFF_NO_QUEUE;
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netdev->needs_free_netdev = true;
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netdev->priv_destructor = internal_dev_destructor;
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netdev->ethtool_ops = &internal_dev_ethtool_ops;
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netdev->rtnl_link_ops = &internal_dev_link_ops;
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netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
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NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
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NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
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netdev->vlan_features = netdev->features;
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netdev->hw_enc_features = netdev->features;
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netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
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netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
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eth_hw_addr_random(netdev);
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}
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static struct vport *internal_dev_create(const struct vport_parms *parms)
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{
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struct vport *vport;
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struct internal_dev *internal_dev;
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struct net_device *dev;
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int err;
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bool free_vport = true;
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vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
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if (IS_ERR(vport)) {
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err = PTR_ERR(vport);
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goto error;
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}
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dev = alloc_netdev(sizeof(struct internal_dev),
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parms->name, NET_NAME_USER, do_setup);
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vport->dev = dev;
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if (!vport->dev) {
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err = -ENOMEM;
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goto error_free_vport;
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}
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vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
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if (!vport->dev->tstats) {
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err = -ENOMEM;
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goto error_free_netdev;
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}
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dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
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internal_dev = internal_dev_priv(vport->dev);
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internal_dev->vport = vport;
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/* Restrict bridge port to current netns. */
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if (vport->port_no == OVSP_LOCAL)
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vport->dev->features |= NETIF_F_NETNS_LOCAL;
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rtnl_lock();
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err = register_netdevice(vport->dev);
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if (err) {
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free_vport = false;
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goto error_unlock;
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}
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dev_set_promiscuity(vport->dev, 1);
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rtnl_unlock();
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netif_start_queue(vport->dev);
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return vport;
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error_unlock:
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rtnl_unlock();
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free_percpu(dev->tstats);
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error_free_netdev:
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free_netdev(dev);
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error_free_vport:
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if (free_vport)
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ovs_vport_free(vport);
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error:
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return ERR_PTR(err);
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}
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static void internal_dev_destroy(struct vport *vport)
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{
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netif_stop_queue(vport->dev);
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rtnl_lock();
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dev_set_promiscuity(vport->dev, -1);
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/* unregister_netdevice() waits for an RCU grace period. */
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unregister_netdevice(vport->dev);
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free_percpu(vport->dev->tstats);
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rtnl_unlock();
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}
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static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
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{
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struct net_device *netdev = skb->dev;
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struct pcpu_sw_netstats *stats;
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if (unlikely(!(netdev->flags & IFF_UP))) {
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kfree_skb(skb);
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netdev->stats.rx_dropped++;
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return NETDEV_TX_OK;
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}
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skb_dst_drop(skb);
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nf_reset(skb);
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secpath_reset(skb);
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skb->pkt_type = PACKET_HOST;
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skb->protocol = eth_type_trans(skb, netdev);
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skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
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stats = this_cpu_ptr(netdev->tstats);
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u64_stats_update_begin(&stats->syncp);
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stats->rx_packets++;
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stats->rx_bytes += skb->len;
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u64_stats_update_end(&stats->syncp);
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netif_rx(skb);
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return NETDEV_TX_OK;
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}
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static struct vport_ops ovs_internal_vport_ops = {
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.type = OVS_VPORT_TYPE_INTERNAL,
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.create = internal_dev_create,
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.destroy = internal_dev_destroy,
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.send = internal_dev_recv,
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};
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int ovs_is_internal_dev(const struct net_device *netdev)
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{
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return netdev->netdev_ops == &internal_dev_netdev_ops;
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}
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struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
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{
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if (!ovs_is_internal_dev(netdev))
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return NULL;
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return internal_dev_priv(netdev)->vport;
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}
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int ovs_internal_dev_rtnl_link_register(void)
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{
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int err;
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err = rtnl_link_register(&internal_dev_link_ops);
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if (err < 0)
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return err;
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err = ovs_vport_ops_register(&ovs_internal_vport_ops);
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if (err < 0)
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rtnl_link_unregister(&internal_dev_link_ops);
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return err;
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}
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void ovs_internal_dev_rtnl_link_unregister(void)
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{
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ovs_vport_ops_unregister(&ovs_internal_vport_ops);
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rtnl_link_unregister(&internal_dev_link_ops);
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}
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