Merge commit '180c6d0b440961cbc873c4d045eb8b2daa1364e9'

[sliver-openvswitch.git] / datapath / vport-netdev.c

diff --git a/datapath/vport-netdev.c b/datapath/vport-netdev.c
index f8948fa..4e7342c 100644 (file)
--- a/datapath/vport-netdev.c
+++ b/datapath/vport-netdev.c
@@ -45,6 +45,12 @@ MODULE_PARM_DESC(vlan_tso, "Enable TSO for VLAN packets");
 #define vlan_tso true
 #endif
 
+#ifdef HAVE_RHEL_OVS_HOOK
+static atomic_t nr_bridges = ATOMIC_INIT(0);
+
+extern struct sk_buff *(*openvswitch_handle_frame_hook)(struct sk_buff *skb);
+#endif
+
 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb);
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,39)
@@ -63,7 +69,8 @@ static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
 
        return RX_HANDLER_CONSUMED;
 }
-#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
+      defined HAVE_RHEL_OVS_HOOK
 /* Called with rcu_read_lock and bottom-halves disabled. */
 static struct sk_buff *netdev_frame_hook(struct sk_buff *skb)
 {
@@ -105,21 +112,32 @@ static int netdev_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
 #error
 #endif
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
+    defined HAVE_RHEL_OVS_HOOK
 static int netdev_init(void) { return 0; }
 static void netdev_exit(void) { }
 #else
-static int netdev_init(void)
+static int port_count;
+
+static void netdev_init(void)
 {
+       port_count++;
+       if (port_count > 1)
+               return;
+
        /* Hook into callback used by the bridge to intercept packets.
         * Parasites we are. */
        br_handle_frame_hook = netdev_frame_hook;
 
-       return 0;
+       return;
 }
 
 static void netdev_exit(void)
 {
+       port_count--;
+       if (port_count > 0)
+               return;
+
        br_handle_frame_hook = NULL;
 }
 #endif
@@ -153,10 +171,16 @@ static struct vport *netdev_create(const struct vport_parms *parms)
        }
 
        rtnl_lock();
+#ifdef HAVE_RHEL_OVS_HOOK
+       rcu_assign_pointer(netdev_vport->dev->ax25_ptr, vport);
+       atomic_inc(&nr_bridges);
+       rcu_assign_pointer(openvswitch_handle_frame_hook, netdev_frame_hook);
+#else
        err = netdev_rx_handler_register(netdev_vport->dev, netdev_frame_hook,
                                         vport);
        if (err)
                goto error_unlock;
+#endif
 
        dev_set_promiscuity(netdev_vport->dev, 1);
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
@@ -165,9 +189,12 @@ static struct vport *netdev_create(const struct vport_parms *parms)
        netdev_vport->dev->priv_flags |= IFF_OVS_DATAPATH;
        rtnl_unlock();
 
+       netdev_init();
        return vport;
 
+#ifndef HAVE_RHEL_OVS_HOOK
 error_unlock:
+#endif
        rtnl_unlock();
 error_put:
        dev_put(netdev_vport->dev);
@@ -182,6 +209,12 @@ static void free_port_rcu(struct rcu_head *rcu)
        struct netdev_vport *netdev_vport = container_of(rcu,
                                        struct netdev_vport, rcu);
 
+#ifdef HAVE_RHEL_OVS_HOOK
+       rcu_assign_pointer(netdev_vport->dev->ax25_ptr, NULL);
+
+       if (atomic_dec_and_test(&nr_bridges))
+               rcu_assign_pointer(openvswitch_handle_frame_hook, NULL);
+#endif
        dev_put(netdev_vport->dev);
        ovs_vport_free(vport_from_priv(netdev_vport));
 }
@@ -190,6 +223,7 @@ static void netdev_destroy(struct vport *vport)
 {
        struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
 
+       netdev_exit();
        rtnl_lock();
        netdev_vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
        netdev_rx_handler_unregister(netdev_vport->dev);
@@ -205,12 +239,6 @@ const char *ovs_netdev_get_name(const struct vport *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;
-}
-
 /* Must be called with rcu_read_lock. */
 static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
 {
@@ -235,7 +263,7 @@ static void netdev_port_receive(struct vport *vport, struct sk_buff *skb)
 
        vlan_copy_skb_tci(skb);
 
-       ovs_vport_receive(vport, skb);
+       ovs_vport_receive(vport, skb, NULL);
        return;
 
 error:
@@ -275,7 +303,7 @@ static int netdev_send(struct vport *vport, struct sk_buff *skb)
                net_warn_ratelimited("%s: dropped over-mtu packet: %d > %d\n",
                                     netdev_vport->dev->name,
                                     packet_length(skb), mtu);
-               goto error;
+               goto drop;
        }
 
        skb->dev = netdev_vport->dev;
@@ -296,19 +324,15 @@ static int netdev_send(struct vport *vport, struct sk_buff *skb)
                        nskb = skb_gso_segment(skb, features);
                        if (!nskb) {
                                if (unlikely(skb_cloned(skb) &&
-                                   pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) {
-                                       kfree_skb(skb);
-                                       return 0;
-                               }
+                                   pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
+                                       goto drop;
 
                                skb_shinfo(skb)->gso_type &= ~SKB_GSO_DODGY;
                                goto tag;
                        }
 
-                       if (IS_ERR(nskb)) {
-                               kfree_skb(skb);
-                               return 0;
-                       }
+                       if (IS_ERR(nskb))
+                               goto drop;
                        consume_skb(skb);
                        skb = nskb;
 
@@ -342,22 +366,26 @@ tag:
 
        return len;
 
-error:
+drop:
        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 LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36) || \
+    defined HAVE_RHEL_OVS_HOOK
 #if IFF_OVS_DATAPATH != 0
        if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
 #else
        if (likely(rcu_access_pointer(dev->rx_handler) == netdev_frame_hook))
 #endif
+#ifdef HAVE_RHEL_OVS_HOOK
+               return (struct vport *)rcu_dereference_rtnl(dev->ax25_ptr);
+#else
                return (struct vport *)rcu_dereference_rtnl(dev->rx_handler_data);
+#endif
        else
                return NULL;
 #else
@@ -367,17 +395,14 @@ struct vport *ovs_netdev_get_vport(struct net_device *dev)
 
 const struct vport_ops ovs_netdev_vport_ops = {
        .type           = OVS_VPORT_TYPE_NETDEV,
-       .flags          = VPORT_F_REQUIRED,
-       .init           = netdev_init,
-       .exit           = netdev_exit,
        .create         = netdev_create,
        .destroy        = netdev_destroy,
        .get_name       = ovs_netdev_get_name,
-       .get_ifindex    = ovs_netdev_get_ifindex,
        .send           = netdev_send,
 };
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) && \
+    !defined HAVE_RHEL_OVS_HOOK
 /*
  * Enforces, mutual exclusion with the Linux bridge module, by declaring and
  * exporting br_should_route_hook.  Because the bridge module also exports the