1 files changed, 198 insertions, 0 deletions

diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
new file mode 100644
index 000000000000..c1068aed03d1
--- /dev/null
+++ b/net/openvswitch/vport-netdev.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2007-2011 Nicira Networks.
+ *
+ * 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 <net/llc.h>
+
+#include "datapath.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+/* Must be called with rcu_read_lock. */
+static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
+{
+        if (unlikely(!vport)) {
+                kfree_skb(skb);
+                return;
+        }
+
+        /* 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).
+         * (No one comes after us, since we tell handle_bridge() that we took
+         * the packet.) */
+        skb = skb_share_check(skb, GFP_ATOMIC);
+        if (unlikely(!skb))
+                return;
+
+        skb_push(skb, ETH_HLEN);
+        ovs_vport_receive(vport, 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 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(&init_net, 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;
+        }
+
+        err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
+                                         vport);
+        if (err)
+                goto error_put;
+
+        dev_set_promiscuity(netdev_vport->dev, 1);
+        netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
+
+        return vport;
+
+error_put:
+        dev_put(netdev_vport->dev);
+error_free_vport:
+        ovs_vport_free(vport);
+error:
+        return ERR_PTR(err);
+}
+
+static void netdev_destroy(struct vport *vport)
+{
+        struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
+
+        netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
+        netdev_rx_handler_unregister(netdev_vport->dev);
+        dev_set_promiscuity(netdev_vport->dev, -1);
+
+        synchronize_rcu();
+
+        dev_put(netdev_vport->dev);
+        ovs_vport_free(vport);
+}
+
+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;
+}
+
+int ovs_netdev_get_ifindex(const struct vport *vport)
+{
+        const struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
+        return netdev_vport->dev->ifindex;
+}
+
+static unsigned packet_length(const struct sk_buff *skb)
+{
+        unsigned 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))) {
+                if (net_ratelimit())
+                        pr_warn("%s: dropped over-mtu packet: %d > %d\n",
+                                ovs_dp_name(vport->dp), packet_length(skb), mtu);
+                goto error;
+        }
+
+        if (unlikely(skb_warn_if_lro(skb)))
+                goto error;
+
+        skb->dev = netdev_vport->dev;
+        len = skb->len;
+        dev_queue_xmit(skb);
+
+        return len;
+
+error:
+        kfree_skb(skb);
+        ovs_vport_record_error(vport, VPORT_E_TX_DROPPED);
+        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;
+}
+
+const struct vport_ops ovs_netdev_vport_ops = {
+        .type           = OVS_VPORT_TYPE_NETDEV,
+        .create         = netdev_create,
+        .destroy        = netdev_destroy,
+        .get_name       = ovs_netdev_get_name,
+        .get_ifindex    = ovs_netdev_get_ifindex,
+        .send           = netdev_send,
+};