--- /dev/null
+/*
+ * 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
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/if_arp.h>
+#include <linux/if_bridge.h>
+#include <linux/if_vlan.h>
+#include <linux/kernel.h>
+#include <linux/llc.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/openvswitch.h>
+
+#include <net/llc.h>
+
+#include "datapath.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+static struct vport_ops ovs_netdev_vport_ops;
+
+/* Must be called with rcu_read_lock. */
+static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
+{
+ if (unlikely(!vport))
+ goto error;
+
+ if (unlikely(skb_warn_if_lro(skb)))
+ goto error;
+
+ /* Make our own copy of the packet. Otherwise we will mangle the
+ * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
+ */
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (unlikely(!skb))
+ return;
+
+ skb_push(skb, ETH_HLEN);
+ ovs_skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
+
+ ovs_vport_receive(vport, skb, NULL);
+ return;
+
+error:
+ kfree_skb(skb);
+}
+
+/* Called with rcu_read_lock and bottom-halves disabled. */
+static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
+{
+ struct sk_buff *skb = *pskb;
+ struct vport *vport;
+
+ if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
+ return RX_HANDLER_PASS;
+
+ vport = ovs_netdev_get_vport(skb->dev);
+
+ netdev_port_receive(vport, skb);
+
+ return RX_HANDLER_CONSUMED;
+}
+
+static struct net_device *get_dpdev(const struct datapath *dp)
+{
+ struct vport *local;
+
+ local = ovs_vport_ovsl(dp, OVSP_LOCAL);
+ BUG_ON(!local);
+ return netdev_vport_priv(local)->dev;
+}
+
+static struct vport *netdev_create(const struct vport_parms *parms)
+{
+ struct vport *vport;
+ struct netdev_vport *netdev_vport;
+ int err;
+
+ vport = ovs_vport_alloc(sizeof(struct netdev_vport),
+ &ovs_netdev_vport_ops, parms);
+ if (IS_ERR(vport)) {
+ err = PTR_ERR(vport);
+ goto error;
+ }
+
+ netdev_vport = netdev_vport_priv(vport);
+
+ netdev_vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), parms->name);
+ if (!netdev_vport->dev) {
+ err = -ENODEV;
+ goto error_free_vport;
+ }
+
+ if (netdev_vport->dev->flags & IFF_LOOPBACK ||
+ netdev_vport->dev->type != ARPHRD_ETHER ||
+ ovs_is_internal_dev(netdev_vport->dev)) {
+ err = -EINVAL;
+ goto error_put;
+ }
+
+ rtnl_lock();
+ err = netdev_master_upper_dev_link(netdev_vport->dev,
+ get_dpdev(vport->dp));
+ if (err)
+ goto error_unlock;
+
+ err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
+ vport);
+ if (err)
+ goto error_master_upper_dev_unlink;
+
+ dev_disable_lro(netdev_vport->dev);
+ dev_set_promiscuity(netdev_vport->dev, 1);
+ netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
+ rtnl_unlock();
+
+ return vport;
+
+error_master_upper_dev_unlink:
+ netdev_upper_dev_unlink(netdev_vport->dev, get_dpdev(vport->dp));
+error_unlock:
+ rtnl_unlock();
+error_put:
+ dev_put(netdev_vport->dev);
+error_free_vport:
+ ovs_vport_free(vport);
+error:
+ return ERR_PTR(err);
+}
+
+static void free_port_rcu(struct rcu_head *rcu)
+{
+ struct netdev_vport *netdev_vport = container_of(rcu,
+ struct netdev_vport, rcu);
+
+ dev_put(netdev_vport->dev);
+ ovs_vport_free(vport_from_priv(netdev_vport));
+}
+
+void ovs_netdev_detach_dev(struct vport *vport)
+{
+ struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
+
+ ASSERT_RTNL();
+ netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
+ netdev_rx_handler_unregister(netdev_vport->dev);
+ netdev_upper_dev_unlink(netdev_vport->dev,
+ netdev_master_upper_dev_get(netdev_vport->dev));
+ dev_set_promiscuity(netdev_vport->dev, -1);
+}
+
+static void netdev_destroy(struct vport *vport)
+{
+ struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
+
+ rtnl_lock();
+ if (netdev_vport->dev->priv_flags & IFF_OVS_DATAPATH)
+ ovs_netdev_detach_dev(vport);
+ rtnl_unlock();
+
+ call_rcu(&netdev_vport->rcu, free_port_rcu);
+}
+
+const char *ovs_netdev_get_name(const struct vport *vport)
+{
+ const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
+ return netdev_vport->dev->name;
+}
+
+static unsigned int packet_length(const struct sk_buff *skb)
+{
+ unsigned int length = skb->len - ETH_HLEN;
+
+ if (skb->protocol == htons(ETH_P_8021Q))
+ length -= VLAN_HLEN;
+
+ return length;
+}
+
+static int netdev_send(struct vport *vport, struct sk_buff *skb)
+{
+ struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
+ int mtu = netdev_vport->dev->mtu;
+ int len;
+
+ if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
+ net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
+ netdev_vport->dev->name,
+ packet_length(skb), mtu);
+ goto drop;
+ }
+
+ skb->dev = netdev_vport->dev;
+ len = skb->len;
+ dev_queue_xmit(skb);
+
+ return len;
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+/* Returns null if this device is not attached to a datapath. */
+struct vport *ovs_netdev_get_vport(struct net_device *dev)
+{
+ if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
+ return (struct vport *)
+ rcu_dereference_rtnl(dev->rx_handler_data);
+ else
+ return NULL;
+}
+
+static struct vport_ops ovs_netdev_vport_ops = {
+ .type = OVS_VPORT_TYPE_NETDEV,
+ .create = netdev_create,
+ .destroy = netdev_destroy,
+ .get_name = ovs_netdev_get_name,
+ .send = netdev_send,
+};
+
+int __init ovs_netdev_init(void)
+{
+ return ovs_vport_ops_register(&ovs_netdev_vport_ops);
+}
+
+void ovs_netdev_exit(void)
+{
+ ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
+}
Code Review / kvmfornfv.git / blobdiff