diff options
Diffstat (limited to 'net/openvswitch/vport-internal_dev.c')
| -rw-r--r-- | net/openvswitch/vport-internal_dev.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/net/openvswitch/vport-internal_dev.c b/net/openvswitch/vport-internal_dev.c new file mode 100644 index 000000000..74c88a6ba --- /dev/null +++ b/net/openvswitch/vport-internal_dev.c @@ -0,0 +1,255 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2007-2012 Nicira, Inc. + */ + +#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; + + /* store len value because skb can be freed inside ovs_vport_receive() */ + len = skb->len; + + rcu_read_lock(); + err = ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL); + rcu_read_unlock(); + + if (likely(!err)) + dev_sw_netstats_tx_add(netdev, 1, len); + 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) +{ + strscpy(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 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 = dev_get_tstats64, +}; + +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 = NULL; + 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; + struct net_device *dev; + int err; + + vport = ovs_vport_alloc(0, &ovs_internal_vport_ops, parms); + if (IS_ERR(vport)) { + err = PTR_ERR(vport); + goto error; + } + + dev = alloc_netdev(sizeof(struct internal_dev), + parms->name, NET_NAME_USER, do_setup); + vport->dev = dev; + 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)); + dev->ifindex = parms->desired_ifindex; + 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; + vport->dev->priv_destructor = internal_dev_destructor; + + dev_set_promiscuity(vport->dev, 1); + rtnl_unlock(); + netif_start_queue(vport->dev); + + return vport; + +error_unlock: + rtnl_unlock(); + free_percpu(dev->tstats); +error_free_netdev: + free_netdev(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 int internal_dev_recv(struct sk_buff *skb) +{ + struct net_device *netdev = skb->dev; + + if (unlikely(!(netdev->flags & IFF_UP))) { + kfree_skb(skb); + netdev->stats.rx_dropped++; + return NETDEV_TX_OK; + } + + skb_dst_drop(skb); + nf_reset_ct(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); + dev_sw_netstats_rx_add(netdev, skb->len); + + 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); +} |