/*
* Copyright (c) 2007-2012 Nicira, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#include <linux/if_vlan.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <net/rtnetlink.h>
#include "datapath.h"
#include "vport-internal_dev.h"
#include "vport-netdev.h"
struct internal_dev {
struct vport *vport;
};
static struct vport_ops ovs_internal_vport_ops;
static struct internal_dev *internal_dev_priv(struct net_device *netdev)
{
return netdev_priv(netdev);
}
/* Called with rcu_read_lock_bh. */
static netdev_tx_t
internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
{
int len, err;
len = skb->len;
rcu_read_lock();
err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);
rcu_read_unlock();
if (likely(!err)) {
struct pcpu_sw_netstats *tstats = this_cpu_ptr(netdev->tstats);
u64_stats_update_begin(&tstats->syncp);
tstats->tx_bytes += len;
tstats->tx_packets++;
u64_stats_update_end(&tstats->syncp);
} else {
netdev->stats.tx_errors++;
}
return NETDEV_TX_OK;
}
static int internal_dev_open(struct net_device *netdev)
{
netif_start_queue(netdev);
return 0;
}
static int internal_dev_stop(struct net_device *netdev)
{
netif_stop_queue(netdev);
return 0;
}
static void internal_dev_getinfo(struct net_device *netdev,
struct ethtool_drvinfo *info)
{
strlcpy(info->driver, "openvswitch", sizeof(info->driver));
}
static const struct ethtool_ops internal_dev_ethtool_ops = {
.get_drvinfo = internal_dev_getinfo,
.get_link = ethtool_op_get_link,
};
static void internal_dev_destructor(struct net_device *dev)
{
struct vport *vport = ovs_internal_dev_get_vport(dev);
ovs_vport_free(vport);
}
static void
internal_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats)
{
int i;
memset(stats, 0, sizeof(*stats));
stats->rx_errors = dev->stats.rx_errors;
stats->tx_errors = dev->stats.tx_errors;
stats->tx_dropped = dev->stats.tx_dropped;
stats->rx_dropped = dev->stats.rx_dropped;
for_each_possible_cpu(i) {
const struct pcpu_sw_netstats *percpu_stats;
struct pcpu_sw_netstats local_stats;
unsigned int start;
percpu_stats = per_cpu_ptr(dev->tstats, i);
do {
start = u64_stats_fetch_begin_irq(&percpu_stats->syncp);
local_stats = *percpu_stats;
} while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start));
stats->rx_bytes += local_stats.rx_bytes;
stats->rx_packets += local_stats.rx_packets;
stats->tx_bytes += local_stats.tx_bytes;
stats->tx_packets += local_stats.tx_packets;
}
}
static const struct net_device_ops internal_dev_netdev_ops = {
.ndo_open = internal_dev_open,
.ndo_stop = internal_dev_stop,
.ndo_start_xmit = internal_dev_xmit,
.ndo_set_mac_address = eth_mac_addr,
.ndo_get_stats64 = internal_get_stats,
};
static struct rtnl_link_ops internal_dev_link_ops __read_mostly = {
.kind = "openvswitch",
};
static void do_setup(struct net_device *netdev)
{
ether_setup(netdev);
netdev->max_mtu = ETH_MAX_MTU;
netdev->netdev_ops = &internal_dev_netdev_ops;
netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_OPENVSWITCH |
IFF_NO_QUEUE;
netdev->needs_free_netdev = true;
netdev->priv_destructor = internal_dev_destructor;
netdev->ethtool_ops = &internal_dev_ethtool_ops;
netdev->rtnl_link_ops = &internal_dev_link_ops;
netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
NETIF_F_HIGHDMA | NETIF_F_HW_CSUM |
NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL;
netdev->vlan_features = netdev->features;
netdev->hw_enc_features = netdev->features;
netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX;
netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
eth_hw_addr_random(netdev);
}
static struct vport *internal_dev_create(const struct vport_parms *parms)
{
struct vport *vport;
struct internal_dev *internal_dev;
int err;
vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms);
if (IS_ERR(vport)) {
err = PTR_ERR(vport);
goto error;
}
vport->dev = alloc_netdev(sizeof(struct internal_dev),
parms->name, NET_NAME_USER, do_setup);
if (!vport->dev) {
err = -ENOMEM;
goto error_free_vport;
}
vport->dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!vport->dev->tstats) {
err = -ENOMEM;
goto error_free_netdev;
}
dev_net_set(vport->dev, ovs_dp_get_net(vport->dp));
internal_dev = internal_dev_priv(vport->dev);
internal_dev->vport = vport;
/* Restrict bridge port to current netns. */
if (vport->port_no == OVSP_LOCAL)
vport->dev->features |= NETIF_F_NETNS_LOCAL;
rtnl_lock();
err = register_netdevice(vport->dev);
if (err)
goto error_unlock;
dev_set_promiscuity(vport->dev, 1);
rtnl_unlock();
netif_start_queue(vport->dev);
return vport;
error_unlock:
rtnl_unlock();
free_percpu(vport->dev->tstats);
error_free_netdev:
free_netdev(vport->dev);
error_free_vport:
ovs_vport_free(vport);
error:
return ERR_PTR(err);
}
static void internal_dev_destroy(struct vport *vport)
{
netif_stop_queue(vport->dev);
rtnl_lock();
dev_set_promiscuity(vport->dev, -1);
/* unregister_netdevice() waits for an RCU grace period. */
unregister_netdevice(vport->dev);
free_percpu(vport->dev->tstats);
rtnl_unlock();
}
static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
{
struct net_device *netdev = skb->dev;
struct pcpu_sw_netstats *stats;
if (unlikely(!(netdev->flags & IFF_UP))) {
kfree_skb(skb);
netdev->stats.rx_dropped++;
return NETDEV_TX_OK;
}
skb_dst_drop(skb);
nf_reset(skb);
secpath_reset(skb);
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, netdev);
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
stats = this_cpu_ptr(netdev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->rx_packets++;
stats->rx_bytes += skb->len;
u64_stats_update_end(&stats->syncp);
netif_rx(skb);
return NETDEV_TX_OK;
}
static struct vport_ops ovs_internal_vport_ops = {
.type = OVS_VPORT_TYPE_INTERNAL,
.create = internal_dev_create,
.destroy = internal_dev_destroy,
.send = internal_dev_recv,
};
int ovs_is_internal_dev(const struct net_device *netdev)
{
return netdev->netdev_ops == &internal_dev_netdev_ops;
}
struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
{
if (!ovs_is_internal_dev(netdev))
return NULL;
return internal_dev_priv(netdev)->vport;
}
int ovs_internal_dev_rtnl_link_register(void)
{
int err;
err = rtnl_link_register(&internal_dev_link_ops);
if (err < 0)
return err;
err = ovs_vport_ops_register(&ovs_internal_vport_ops);
if (err < 0)
rtnl_link_unregister(&internal_dev_link_ops);
return err;
}
void ovs_internal_dev_rtnl_link_unregister(void)
{
ovs_vport_ops_unregister(&ovs_internal_vport_ops);
rtnl_link_unregister(&internal_dev_link_ops);
}
