Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/jesse/openvswitch

Jesse Gross says:

====================
A number of improvements for net-next/3.10.

Highlights include:

 * Properly exposing linux/openvswitch.h to userspace after the uapi
   changes.

 * Simplification of locking. It immediately makes things simpler to
   reason about and avoids holding RTNL mutex for longer than
   necessary. In the near future it will also enable tunnel
   registration and more fine-grained locking.

 * Miscellaneous cleanups and simplifications.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 458 insertions, 431 deletions

diff --git a/include/linux/openvswitch.h b/include/linux/openvswitch.h
index 67d6c7b03581..e6b240b6196c 100644
--- a/include/linux/openvswitch.h
+++ b/include/linux/openvswitch.h
@@ -19,436 +19,6 @@
 #ifndef _LINUX_OPENVSWITCH_H
 #define _LINUX_OPENVSWITCH_H 1
 
-#include <linux/types.h>
-
-/**
- * struct ovs_header - header for OVS Generic Netlink messages.
- * @dp_ifindex: ifindex of local port for datapath (0 to make a request not
- * specific to a datapath).
- *
- * Attributes following the header are specific to a particular OVS Generic
- * Netlink family, but all of the OVS families use this header.
- */
-
-struct ovs_header {
-	int dp_ifindex;
-};
-
-/* Datapaths. */
-
-#define OVS_DATAPATH_FAMILY  "ovs_datapath"
-#define OVS_DATAPATH_MCGROUP "ovs_datapath"
-#define OVS_DATAPATH_VERSION 0x1
-
-enum ovs_datapath_cmd {
-	OVS_DP_CMD_UNSPEC,
-	OVS_DP_CMD_NEW,
-	OVS_DP_CMD_DEL,
-	OVS_DP_CMD_GET,
-	OVS_DP_CMD_SET
-};
-
-/**
- * enum ovs_datapath_attr - attributes for %OVS_DP_* commands.
- * @OVS_DP_ATTR_NAME: Name of the network device that serves as the "local
- * port".  This is the name of the network device whose dp_ifindex is given in
- * the &struct ovs_header.  Always present in notifications.  Required in
- * %OVS_DP_NEW requests.  May be used as an alternative to specifying
- * dp_ifindex in other requests (with a dp_ifindex of 0).
- * @OVS_DP_ATTR_UPCALL_PID: The Netlink socket in userspace that is initially
- * set on the datapath port (for OVS_ACTION_ATTR_MISS).  Only valid on
- * %OVS_DP_CMD_NEW requests. A value of zero indicates that upcalls should
- * not be sent.
- * @OVS_DP_ATTR_STATS: Statistics about packets that have passed through the
- * datapath.  Always present in notifications.
- *
- * These attributes follow the &struct ovs_header within the Generic Netlink
- * payload for %OVS_DP_* commands.
- */
-enum ovs_datapath_attr {
-	OVS_DP_ATTR_UNSPEC,
-	OVS_DP_ATTR_NAME,       /* name of dp_ifindex netdev */
-	OVS_DP_ATTR_UPCALL_PID, /* Netlink PID to receive upcalls */
-	OVS_DP_ATTR_STATS,      /* struct ovs_dp_stats */
-	__OVS_DP_ATTR_MAX
-};
-
-#define OVS_DP_ATTR_MAX (__OVS_DP_ATTR_MAX - 1)
-
-struct ovs_dp_stats {
-	__u64 n_hit;             /* Number of flow table matches. */
-	__u64 n_missed;          /* Number of flow table misses. */
-	__u64 n_lost;            /* Number of misses not sent to userspace. */
-	__u64 n_flows;           /* Number of flows present */
-};
-
-struct ovs_vport_stats {
-	__u64   rx_packets;		/* total packets received       */
-	__u64   tx_packets;		/* total packets transmitted    */
-	__u64   rx_bytes;		/* total bytes received         */
-	__u64   tx_bytes;		/* total bytes transmitted      */
-	__u64   rx_errors;		/* bad packets received         */
-	__u64   tx_errors;		/* packet transmit problems     */
-	__u64   rx_dropped;		/* no space in linux buffers    */
-	__u64   tx_dropped;		/* no space available in linux  */
-};
-
-/* Fixed logical ports. */
-#define OVSP_LOCAL      ((__u32)0)
-
-/* Packet transfer. */
-
-#define OVS_PACKET_FAMILY "ovs_packet"
-#define OVS_PACKET_VERSION 0x1
-
-enum ovs_packet_cmd {
-	OVS_PACKET_CMD_UNSPEC,
-
-	/* Kernel-to-user notifications. */
-	OVS_PACKET_CMD_MISS,    /* Flow table miss. */
-	OVS_PACKET_CMD_ACTION,  /* OVS_ACTION_ATTR_USERSPACE action. */
-
-	/* Userspace commands. */
-	OVS_PACKET_CMD_EXECUTE  /* Apply actions to a packet. */
-};
-
-/**
- * enum ovs_packet_attr - attributes for %OVS_PACKET_* commands.
- * @OVS_PACKET_ATTR_PACKET: Present for all notifications.  Contains the entire
- * packet as received, from the start of the Ethernet header onward.  For
- * %OVS_PACKET_CMD_ACTION, %OVS_PACKET_ATTR_PACKET reflects changes made by
- * actions preceding %OVS_ACTION_ATTR_USERSPACE, but %OVS_PACKET_ATTR_KEY is
- * the flow key extracted from the packet as originally received.
- * @OVS_PACKET_ATTR_KEY: Present for all notifications.  Contains the flow key
- * extracted from the packet as nested %OVS_KEY_ATTR_* attributes.  This allows
- * userspace to adapt its flow setup strategy by comparing its notion of the
- * flow key against the kernel's.
- * @OVS_PACKET_ATTR_ACTIONS: Contains actions for the packet.  Used
- * for %OVS_PACKET_CMD_EXECUTE.  It has nested %OVS_ACTION_ATTR_* attributes.
- * @OVS_PACKET_ATTR_USERDATA: Present for an %OVS_PACKET_CMD_ACTION
- * notification if the %OVS_ACTION_ATTR_USERSPACE action specified an
- * %OVS_USERSPACE_ATTR_USERDATA attribute, with the same length and content
- * specified there.
- *
- * These attributes follow the &struct ovs_header within the Generic Netlink
- * payload for %OVS_PACKET_* commands.
- */
-enum ovs_packet_attr {
-	OVS_PACKET_ATTR_UNSPEC,
-	OVS_PACKET_ATTR_PACKET,      /* Packet data. */
-	OVS_PACKET_ATTR_KEY,         /* Nested OVS_KEY_ATTR_* attributes. */
-	OVS_PACKET_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
-	OVS_PACKET_ATTR_USERDATA,    /* OVS_ACTION_ATTR_USERSPACE arg. */
-	__OVS_PACKET_ATTR_MAX
-};
-
-#define OVS_PACKET_ATTR_MAX (__OVS_PACKET_ATTR_MAX - 1)
-
-/* Virtual ports. */
-
-#define OVS_VPORT_FAMILY  "ovs_vport"
-#define OVS_VPORT_MCGROUP "ovs_vport"
-#define OVS_VPORT_VERSION 0x1
-
-enum ovs_vport_cmd {
-	OVS_VPORT_CMD_UNSPEC,
-	OVS_VPORT_CMD_NEW,
-	OVS_VPORT_CMD_DEL,
-	OVS_VPORT_CMD_GET,
-	OVS_VPORT_CMD_SET
-};
-
-enum ovs_vport_type {
-	OVS_VPORT_TYPE_UNSPEC,
-	OVS_VPORT_TYPE_NETDEV,   /* network device */
-	OVS_VPORT_TYPE_INTERNAL, /* network device implemented by datapath */
-	__OVS_VPORT_TYPE_MAX
-};
-
-#define OVS_VPORT_TYPE_MAX (__OVS_VPORT_TYPE_MAX - 1)
-
-/**
- * enum ovs_vport_attr - attributes for %OVS_VPORT_* commands.
- * @OVS_VPORT_ATTR_PORT_NO: 32-bit port number within datapath.
- * @OVS_VPORT_ATTR_TYPE: 32-bit %OVS_VPORT_TYPE_* constant describing the type
- * of vport.
- * @OVS_VPORT_ATTR_NAME: Name of vport.  For a vport based on a network device
- * this is the name of the network device.  Maximum length %IFNAMSIZ-1 bytes
- * plus a null terminator.
- * @OVS_VPORT_ATTR_OPTIONS: Vport-specific configuration information.
- * @OVS_VPORT_ATTR_UPCALL_PID: The Netlink socket in userspace that
- * OVS_PACKET_CMD_MISS upcalls will be directed to for packets received on
- * this port.  A value of zero indicates that upcalls should not be sent.
- * @OVS_VPORT_ATTR_STATS: A &struct ovs_vport_stats giving statistics for
- * packets sent or received through the vport.
- *
- * These attributes follow the &struct ovs_header within the Generic Netlink
- * payload for %OVS_VPORT_* commands.
- *
- * For %OVS_VPORT_CMD_NEW requests, the %OVS_VPORT_ATTR_TYPE and
- * %OVS_VPORT_ATTR_NAME attributes are required.  %OVS_VPORT_ATTR_PORT_NO is
- * optional; if not specified a free port number is automatically selected.
- * Whether %OVS_VPORT_ATTR_OPTIONS is required or optional depends on the type
- * of vport.
- * and other attributes are ignored.
- *
- * For other requests, if %OVS_VPORT_ATTR_NAME is specified then it is used to
- * look up the vport to operate on; otherwise dp_idx from the &struct
- * ovs_header plus %OVS_VPORT_ATTR_PORT_NO determine the vport.
- */
-enum ovs_vport_attr {
-	OVS_VPORT_ATTR_UNSPEC,
-	OVS_VPORT_ATTR_PORT_NO,	/* u32 port number within datapath */
-	OVS_VPORT_ATTR_TYPE,	/* u32 OVS_VPORT_TYPE_* constant. */
-	OVS_VPORT_ATTR_NAME,	/* string name, up to IFNAMSIZ bytes long */
-	OVS_VPORT_ATTR_OPTIONS, /* nested attributes, varies by vport type */
-	OVS_VPORT_ATTR_UPCALL_PID, /* u32 Netlink PID to receive upcalls */
-	OVS_VPORT_ATTR_STATS,	/* struct ovs_vport_stats */
-	__OVS_VPORT_ATTR_MAX
-};
-
-#define OVS_VPORT_ATTR_MAX (__OVS_VPORT_ATTR_MAX - 1)
-
-/* Flows. */
-
-#define OVS_FLOW_FAMILY  "ovs_flow"
-#define OVS_FLOW_MCGROUP "ovs_flow"
-#define OVS_FLOW_VERSION 0x1
-
-enum ovs_flow_cmd {
-	OVS_FLOW_CMD_UNSPEC,
-	OVS_FLOW_CMD_NEW,
-	OVS_FLOW_CMD_DEL,
-	OVS_FLOW_CMD_GET,
-	OVS_FLOW_CMD_SET
-};
-
-struct ovs_flow_stats {
-	__u64 n_packets;         /* Number of matched packets. */
-	__u64 n_bytes;           /* Number of matched bytes. */
-};
-
-enum ovs_key_attr {
-	OVS_KEY_ATTR_UNSPEC,
-	OVS_KEY_ATTR_ENCAP,	/* Nested set of encapsulated attributes. */
-	OVS_KEY_ATTR_PRIORITY,  /* u32 skb->priority */
-	OVS_KEY_ATTR_IN_PORT,   /* u32 OVS dp port number */
-	OVS_KEY_ATTR_ETHERNET,  /* struct ovs_key_ethernet */
-	OVS_KEY_ATTR_VLAN,	/* be16 VLAN TCI */
-	OVS_KEY_ATTR_ETHERTYPE,	/* be16 Ethernet type */
-	OVS_KEY_ATTR_IPV4,      /* struct ovs_key_ipv4 */
-	OVS_KEY_ATTR_IPV6,      /* struct ovs_key_ipv6 */
-	OVS_KEY_ATTR_TCP,       /* struct ovs_key_tcp */
-	OVS_KEY_ATTR_UDP,       /* struct ovs_key_udp */
-	OVS_KEY_ATTR_ICMP,      /* struct ovs_key_icmp */
-	OVS_KEY_ATTR_ICMPV6,    /* struct ovs_key_icmpv6 */
-	OVS_KEY_ATTR_ARP,       /* struct ovs_key_arp */
-	OVS_KEY_ATTR_ND,        /* struct ovs_key_nd */
-	OVS_KEY_ATTR_SKB_MARK,  /* u32 skb mark */
-	__OVS_KEY_ATTR_MAX
-};
-
-#define OVS_KEY_ATTR_MAX (__OVS_KEY_ATTR_MAX - 1)
-
-/**
- * enum ovs_frag_type - IPv4 and IPv6 fragment type
- * @OVS_FRAG_TYPE_NONE: Packet is not a fragment.
- * @OVS_FRAG_TYPE_FIRST: Packet is a fragment with offset 0.
- * @OVS_FRAG_TYPE_LATER: Packet is a fragment with nonzero offset.
- *
- * Used as the @ipv4_frag in &struct ovs_key_ipv4 and as @ipv6_frag &struct
- * ovs_key_ipv6.
- */
-enum ovs_frag_type {
-	OVS_FRAG_TYPE_NONE,
-	OVS_FRAG_TYPE_FIRST,
-	OVS_FRAG_TYPE_LATER,
-	__OVS_FRAG_TYPE_MAX
-};
-
-#define OVS_FRAG_TYPE_MAX (__OVS_FRAG_TYPE_MAX - 1)
-
-struct ovs_key_ethernet {
-	__u8	 eth_src[6];
-	__u8	 eth_dst[6];
-};
-
-struct ovs_key_ipv4 {
-	__be32 ipv4_src;
-	__be32 ipv4_dst;
-	__u8   ipv4_proto;
-	__u8   ipv4_tos;
-	__u8   ipv4_ttl;
-	__u8   ipv4_frag;	/* One of OVS_FRAG_TYPE_*. */
-};
-
-struct ovs_key_ipv6 {
-	__be32 ipv6_src[4];
-	__be32 ipv6_dst[4];
-	__be32 ipv6_label;	/* 20-bits in least-significant bits. */
-	__u8   ipv6_proto;
-	__u8   ipv6_tclass;
-	__u8   ipv6_hlimit;
-	__u8   ipv6_frag;	/* One of OVS_FRAG_TYPE_*. */
-};
-
-struct ovs_key_tcp {
-	__be16 tcp_src;
-	__be16 tcp_dst;
-};
-
-struct ovs_key_udp {
-	__be16 udp_src;
-	__be16 udp_dst;
-};
-
-struct ovs_key_icmp {
-	__u8 icmp_type;
-	__u8 icmp_code;
-};
-
-struct ovs_key_icmpv6 {
-	__u8 icmpv6_type;
-	__u8 icmpv6_code;
-};
-
-struct ovs_key_arp {
-	__be32 arp_sip;
-	__be32 arp_tip;
-	__be16 arp_op;
-	__u8   arp_sha[6];
-	__u8   arp_tha[6];
-};
-
-struct ovs_key_nd {
-	__u32 nd_target[4];
-	__u8  nd_sll[6];
-	__u8  nd_tll[6];
-};
-
-/**
- * enum ovs_flow_attr - attributes for %OVS_FLOW_* commands.
- * @OVS_FLOW_ATTR_KEY: Nested %OVS_KEY_ATTR_* attributes specifying the flow
- * key.  Always present in notifications.  Required for all requests (except
- * dumps).
- * @OVS_FLOW_ATTR_ACTIONS: Nested %OVS_ACTION_ATTR_* attributes specifying
- * the actions to take for packets that match the key.  Always present in
- * notifications.  Required for %OVS_FLOW_CMD_NEW requests, optional for
- * %OVS_FLOW_CMD_SET requests.
- * @OVS_FLOW_ATTR_STATS: &struct ovs_flow_stats giving statistics for this
- * flow.  Present in notifications if the stats would be nonzero.  Ignored in
- * requests.
- * @OVS_FLOW_ATTR_TCP_FLAGS: An 8-bit value giving the OR'd value of all of the
- * TCP flags seen on packets in this flow.  Only present in notifications for
- * TCP flows, and only if it would be nonzero.  Ignored in requests.
- * @OVS_FLOW_ATTR_USED: A 64-bit integer giving the time, in milliseconds on
- * the system monotonic clock, at which a packet was last processed for this
- * flow.  Only present in notifications if a packet has been processed for this
- * flow.  Ignored in requests.
- * @OVS_FLOW_ATTR_CLEAR: If present in a %OVS_FLOW_CMD_SET request, clears the
- * last-used time, accumulated TCP flags, and statistics for this flow.
- * Otherwise ignored in requests.  Never present in notifications.
- *
- * These attributes follow the &struct ovs_header within the Generic Netlink
- * payload for %OVS_FLOW_* commands.
- */
-enum ovs_flow_attr {
-	OVS_FLOW_ATTR_UNSPEC,
-	OVS_FLOW_ATTR_KEY,       /* Sequence of OVS_KEY_ATTR_* attributes. */
-	OVS_FLOW_ATTR_ACTIONS,   /* Nested OVS_ACTION_ATTR_* attributes. */
-	OVS_FLOW_ATTR_STATS,     /* struct ovs_flow_stats. */
-	OVS_FLOW_ATTR_TCP_FLAGS, /* 8-bit OR'd TCP flags. */
-	OVS_FLOW_ATTR_USED,      /* u64 msecs last used in monotonic time. */
-	OVS_FLOW_ATTR_CLEAR,     /* Flag to clear stats, tcp_flags, used. */
-	__OVS_FLOW_ATTR_MAX
-};
-
-#define OVS_FLOW_ATTR_MAX (__OVS_FLOW_ATTR_MAX - 1)
-
-/**
- * enum ovs_sample_attr - Attributes for %OVS_ACTION_ATTR_SAMPLE action.
- * @OVS_SAMPLE_ATTR_PROBABILITY: 32-bit fraction of packets to sample with
- * @OVS_ACTION_ATTR_SAMPLE.  A value of 0 samples no packets, a value of
- * %UINT32_MAX samples all packets and intermediate values sample intermediate
- * fractions of packets.
- * @OVS_SAMPLE_ATTR_ACTIONS: Set of actions to execute in sampling event.
- * Actions are passed as nested attributes.
- *
- * Executes the specified actions with the given probability on a per-packet
- * basis.
- */
-enum ovs_sample_attr {
-	OVS_SAMPLE_ATTR_UNSPEC,
-	OVS_SAMPLE_ATTR_PROBABILITY, /* u32 number */
-	OVS_SAMPLE_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
-	__OVS_SAMPLE_ATTR_MAX,
-};
-
-#define OVS_SAMPLE_ATTR_MAX (__OVS_SAMPLE_ATTR_MAX - 1)
-
-/**
- * enum ovs_userspace_attr - Attributes for %OVS_ACTION_ATTR_USERSPACE action.
- * @OVS_USERSPACE_ATTR_PID: u32 Netlink PID to which the %OVS_PACKET_CMD_ACTION
- * message should be sent.  Required.
- * @OVS_USERSPACE_ATTR_USERDATA: If present, its variable-length argument is
- * copied to the %OVS_PACKET_CMD_ACTION message as %OVS_PACKET_ATTR_USERDATA.
- */
-enum ovs_userspace_attr {
-	OVS_USERSPACE_ATTR_UNSPEC,
-	OVS_USERSPACE_ATTR_PID,	      /* u32 Netlink PID to receive upcalls. */
-	OVS_USERSPACE_ATTR_USERDATA,  /* Optional user-specified cookie. */
-	__OVS_USERSPACE_ATTR_MAX
-};
-
-#define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
-
-/**
- * struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
- * @vlan_tpid: Tag protocol identifier (TPID) to push.
- * @vlan_tci: Tag control identifier (TCI) to push.  The CFI bit must be set
- * (but it will not be set in the 802.1Q header that is pushed).
- *
- * The @vlan_tpid value is typically %ETH_P_8021Q.  The only acceptable TPID
- * values are those that the kernel module also parses as 802.1Q headers, to
- * prevent %OVS_ACTION_ATTR_PUSH_VLAN followed by %OVS_ACTION_ATTR_POP_VLAN
- * from having surprising results.
- */
-struct ovs_action_push_vlan {
-	__be16 vlan_tpid;	/* 802.1Q TPID. */
-	__be16 vlan_tci;	/* 802.1Q TCI (VLAN ID and priority). */
-};
-
-/**
- * enum ovs_action_attr - Action types.
- *
- * @OVS_ACTION_ATTR_OUTPUT: Output packet to port.
- * @OVS_ACTION_ATTR_USERSPACE: Send packet to userspace according to nested
- * %OVS_USERSPACE_ATTR_* attributes.
- * @OVS_ACTION_ATTR_SET: Replaces the contents of an existing header.  The
- * single nested %OVS_KEY_ATTR_* attribute specifies a header to modify and its
- * value.
- * @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q header onto the
- * packet.
- * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q header off the packet.
- * @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
- * the nested %OVS_SAMPLE_ATTR_* attributes.
- *
- * Only a single header can be set with a single %OVS_ACTION_ATTR_SET.  Not all
- * fields within a header are modifiable, e.g. the IPv4 protocol and fragment
- * type may not be changed.
- */
-
-enum ovs_action_attr {
-	OVS_ACTION_ATTR_UNSPEC,
-	OVS_ACTION_ATTR_OUTPUT,	      /* u32 port number. */
-	OVS_ACTION_ATTR_USERSPACE,    /* Nested OVS_USERSPACE_ATTR_*. */
-	OVS_ACTION_ATTR_SET,          /* One nested OVS_KEY_ATTR_*. */
-	OVS_ACTION_ATTR_PUSH_VLAN,    /* struct ovs_action_push_vlan. */
-	OVS_ACTION_ATTR_POP_VLAN,     /* No argument. */
-	OVS_ACTION_ATTR_SAMPLE,       /* Nested OVS_SAMPLE_ATTR_*. */
-	__OVS_ACTION_ATTR_MAX
-};
-
-#define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
+#include <uapi/linux/openvswitch.h>
 
 #endif /* _LINUX_OPENVSWITCH_H */
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index 7df190525337..ab5d4992e568 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -285,6 +285,7 @@ header-y += nvram.h
 header-y += omap3isp.h
 header-y += omapfb.h
 header-y += oom.h
+header-y += openvswitch.h
 header-y += packet_diag.h
 header-y += param.h
 header-y += parport.h
diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
new file mode 100644
index 000000000000..405918dd7b3f
--- /dev/null
+++ b/include/uapi/linux/openvswitch.h
@@ -0,0 +1,456 @@
+
+/*
+ * 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
+ */
+
+#ifndef _UAPI__LINUX_OPENVSWITCH_H
+#define _UAPI__LINUX_OPENVSWITCH_H 1
+
+#include <linux/types.h>
+#include <linux/if_ether.h>
+
+/**
+ * struct ovs_header - header for OVS Generic Netlink messages.
+ * @dp_ifindex: ifindex of local port for datapath (0 to make a request not
+ * specific to a datapath).
+ *
+ * Attributes following the header are specific to a particular OVS Generic
+ * Netlink family, but all of the OVS families use this header.
+ */
+
+struct ovs_header {
+	int dp_ifindex;
+};
+
+/* Datapaths. */
+
+#define OVS_DATAPATH_FAMILY  "ovs_datapath"
+#define OVS_DATAPATH_MCGROUP "ovs_datapath"
+#define OVS_DATAPATH_VERSION 0x1
+
+enum ovs_datapath_cmd {
+	OVS_DP_CMD_UNSPEC,
+	OVS_DP_CMD_NEW,
+	OVS_DP_CMD_DEL,
+	OVS_DP_CMD_GET,
+	OVS_DP_CMD_SET
+};
+
+/**
+ * enum ovs_datapath_attr - attributes for %OVS_DP_* commands.
+ * @OVS_DP_ATTR_NAME: Name of the network device that serves as the "local
+ * port".  This is the name of the network device whose dp_ifindex is given in
+ * the &struct ovs_header.  Always present in notifications.  Required in
+ * %OVS_DP_NEW requests.  May be used as an alternative to specifying
+ * dp_ifindex in other requests (with a dp_ifindex of 0).
+ * @OVS_DP_ATTR_UPCALL_PID: The Netlink socket in userspace that is initially
+ * set on the datapath port (for OVS_ACTION_ATTR_MISS).  Only valid on
+ * %OVS_DP_CMD_NEW requests. A value of zero indicates that upcalls should
+ * not be sent.
+ * @OVS_DP_ATTR_STATS: Statistics about packets that have passed through the
+ * datapath.  Always present in notifications.
+ *
+ * These attributes follow the &struct ovs_header within the Generic Netlink
+ * payload for %OVS_DP_* commands.
+ */
+enum ovs_datapath_attr {
+	OVS_DP_ATTR_UNSPEC,
+	OVS_DP_ATTR_NAME,       /* name of dp_ifindex netdev */
+	OVS_DP_ATTR_UPCALL_PID, /* Netlink PID to receive upcalls */
+	OVS_DP_ATTR_STATS,      /* struct ovs_dp_stats */
+	__OVS_DP_ATTR_MAX
+};
+
+#define OVS_DP_ATTR_MAX (__OVS_DP_ATTR_MAX - 1)
+
+struct ovs_dp_stats {
+	__u64 n_hit;             /* Number of flow table matches. */
+	__u64 n_missed;          /* Number of flow table misses. */
+	__u64 n_lost;            /* Number of misses not sent to userspace. */
+	__u64 n_flows;           /* Number of flows present */
+};
+
+struct ovs_vport_stats {
+	__u64   rx_packets;		/* total packets received       */
+	__u64   tx_packets;		/* total packets transmitted    */
+	__u64   rx_bytes;		/* total bytes received         */
+	__u64   tx_bytes;		/* total bytes transmitted      */
+	__u64   rx_errors;		/* bad packets received         */
+	__u64   tx_errors;		/* packet transmit problems     */
+	__u64   rx_dropped;		/* no space in linux buffers    */
+	__u64   tx_dropped;		/* no space available in linux  */
+};
+
+/* Fixed logical ports. */
+#define OVSP_LOCAL      ((__u32)0)
+
+/* Packet transfer. */
+
+#define OVS_PACKET_FAMILY "ovs_packet"
+#define OVS_PACKET_VERSION 0x1
+
+enum ovs_packet_cmd {
+	OVS_PACKET_CMD_UNSPEC,
+
+	/* Kernel-to-user notifications. */
+	OVS_PACKET_CMD_MISS,    /* Flow table miss. */
+	OVS_PACKET_CMD_ACTION,  /* OVS_ACTION_ATTR_USERSPACE action. */
+
+	/* Userspace commands. */
+	OVS_PACKET_CMD_EXECUTE  /* Apply actions to a packet. */
+};
+
+/**
+ * enum ovs_packet_attr - attributes for %OVS_PACKET_* commands.
+ * @OVS_PACKET_ATTR_PACKET: Present for all notifications.  Contains the entire
+ * packet as received, from the start of the Ethernet header onward.  For
+ * %OVS_PACKET_CMD_ACTION, %OVS_PACKET_ATTR_PACKET reflects changes made by
+ * actions preceding %OVS_ACTION_ATTR_USERSPACE, but %OVS_PACKET_ATTR_KEY is
+ * the flow key extracted from the packet as originally received.
+ * @OVS_PACKET_ATTR_KEY: Present for all notifications.  Contains the flow key
+ * extracted from the packet as nested %OVS_KEY_ATTR_* attributes.  This allows
+ * userspace to adapt its flow setup strategy by comparing its notion of the
+ * flow key against the kernel's.
+ * @OVS_PACKET_ATTR_ACTIONS: Contains actions for the packet.  Used
+ * for %OVS_PACKET_CMD_EXECUTE.  It has nested %OVS_ACTION_ATTR_* attributes.
+ * @OVS_PACKET_ATTR_USERDATA: Present for an %OVS_PACKET_CMD_ACTION
+ * notification if the %OVS_ACTION_ATTR_USERSPACE action specified an
+ * %OVS_USERSPACE_ATTR_USERDATA attribute, with the same length and content
+ * specified there.
+ *
+ * These attributes follow the &struct ovs_header within the Generic Netlink
+ * payload for %OVS_PACKET_* commands.
+ */
+enum ovs_packet_attr {
+	OVS_PACKET_ATTR_UNSPEC,
+	OVS_PACKET_ATTR_PACKET,      /* Packet data. */
+	OVS_PACKET_ATTR_KEY,         /* Nested OVS_KEY_ATTR_* attributes. */
+	OVS_PACKET_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
+	OVS_PACKET_ATTR_USERDATA,    /* OVS_ACTION_ATTR_USERSPACE arg. */
+	__OVS_PACKET_ATTR_MAX
+};
+
+#define OVS_PACKET_ATTR_MAX (__OVS_PACKET_ATTR_MAX - 1)
+
+/* Virtual ports. */
+
+#define OVS_VPORT_FAMILY  "ovs_vport"
+#define OVS_VPORT_MCGROUP "ovs_vport"
+#define OVS_VPORT_VERSION 0x1
+
+enum ovs_vport_cmd {
+	OVS_VPORT_CMD_UNSPEC,
+	OVS_VPORT_CMD_NEW,
+	OVS_VPORT_CMD_DEL,
+	OVS_VPORT_CMD_GET,
+	OVS_VPORT_CMD_SET
+};
+
+enum ovs_vport_type {
+	OVS_VPORT_TYPE_UNSPEC,
+	OVS_VPORT_TYPE_NETDEV,   /* network device */
+	OVS_VPORT_TYPE_INTERNAL, /* network device implemented by datapath */
+	__OVS_VPORT_TYPE_MAX
+};
+
+#define OVS_VPORT_TYPE_MAX (__OVS_VPORT_TYPE_MAX - 1)
+
+/**
+ * enum ovs_vport_attr - attributes for %OVS_VPORT_* commands.
+ * @OVS_VPORT_ATTR_PORT_NO: 32-bit port number within datapath.
+ * @OVS_VPORT_ATTR_TYPE: 32-bit %OVS_VPORT_TYPE_* constant describing the type
+ * of vport.
+ * @OVS_VPORT_ATTR_NAME: Name of vport.  For a vport based on a network device
+ * this is the name of the network device.  Maximum length %IFNAMSIZ-1 bytes
+ * plus a null terminator.
+ * @OVS_VPORT_ATTR_OPTIONS: Vport-specific configuration information.
+ * @OVS_VPORT_ATTR_UPCALL_PID: The Netlink socket in userspace that
+ * OVS_PACKET_CMD_MISS upcalls will be directed to for packets received on
+ * this port.  A value of zero indicates that upcalls should not be sent.
+ * @OVS_VPORT_ATTR_STATS: A &struct ovs_vport_stats giving statistics for
+ * packets sent or received through the vport.
+ *
+ * These attributes follow the &struct ovs_header within the Generic Netlink
+ * payload for %OVS_VPORT_* commands.
+ *
+ * For %OVS_VPORT_CMD_NEW requests, the %OVS_VPORT_ATTR_TYPE and
+ * %OVS_VPORT_ATTR_NAME attributes are required.  %OVS_VPORT_ATTR_PORT_NO is
+ * optional; if not specified a free port number is automatically selected.
+ * Whether %OVS_VPORT_ATTR_OPTIONS is required or optional depends on the type
+ * of vport.
+ * and other attributes are ignored.
+ *
+ * For other requests, if %OVS_VPORT_ATTR_NAME is specified then it is used to
+ * look up the vport to operate on; otherwise dp_idx from the &struct
+ * ovs_header plus %OVS_VPORT_ATTR_PORT_NO determine the vport.
+ */
+enum ovs_vport_attr {
+	OVS_VPORT_ATTR_UNSPEC,
+	OVS_VPORT_ATTR_PORT_NO,	/* u32 port number within datapath */
+	OVS_VPORT_ATTR_TYPE,	/* u32 OVS_VPORT_TYPE_* constant. */
+	OVS_VPORT_ATTR_NAME,	/* string name, up to IFNAMSIZ bytes long */
+	OVS_VPORT_ATTR_OPTIONS, /* nested attributes, varies by vport type */
+	OVS_VPORT_ATTR_UPCALL_PID, /* u32 Netlink PID to receive upcalls */
+	OVS_VPORT_ATTR_STATS,	/* struct ovs_vport_stats */
+	__OVS_VPORT_ATTR_MAX
+};
+
+#define OVS_VPORT_ATTR_MAX (__OVS_VPORT_ATTR_MAX - 1)
+
+/* Flows. */
+
+#define OVS_FLOW_FAMILY  "ovs_flow"
+#define OVS_FLOW_MCGROUP "ovs_flow"
+#define OVS_FLOW_VERSION 0x1
+
+enum ovs_flow_cmd {
+	OVS_FLOW_CMD_UNSPEC,
+	OVS_FLOW_CMD_NEW,
+	OVS_FLOW_CMD_DEL,
+	OVS_FLOW_CMD_GET,
+	OVS_FLOW_CMD_SET
+};
+
+struct ovs_flow_stats {
+	__u64 n_packets;         /* Number of matched packets. */
+	__u64 n_bytes;           /* Number of matched bytes. */
+};
+
+enum ovs_key_attr {
+	OVS_KEY_ATTR_UNSPEC,
+	OVS_KEY_ATTR_ENCAP,	/* Nested set of encapsulated attributes. */
+	OVS_KEY_ATTR_PRIORITY,  /* u32 skb->priority */
+	OVS_KEY_ATTR_IN_PORT,   /* u32 OVS dp port number */
+	OVS_KEY_ATTR_ETHERNET,  /* struct ovs_key_ethernet */
+	OVS_KEY_ATTR_VLAN,	/* be16 VLAN TCI */
+	OVS_KEY_ATTR_ETHERTYPE,	/* be16 Ethernet type */
+	OVS_KEY_ATTR_IPV4,      /* struct ovs_key_ipv4 */
+	OVS_KEY_ATTR_IPV6,      /* struct ovs_key_ipv6 */
+	OVS_KEY_ATTR_TCP,       /* struct ovs_key_tcp */
+	OVS_KEY_ATTR_UDP,       /* struct ovs_key_udp */
+	OVS_KEY_ATTR_ICMP,      /* struct ovs_key_icmp */
+	OVS_KEY_ATTR_ICMPV6,    /* struct ovs_key_icmpv6 */
+	OVS_KEY_ATTR_ARP,       /* struct ovs_key_arp */
+	OVS_KEY_ATTR_ND,        /* struct ovs_key_nd */
+	OVS_KEY_ATTR_SKB_MARK,  /* u32 skb mark */
+	__OVS_KEY_ATTR_MAX
+};
+
+#define OVS_KEY_ATTR_MAX (__OVS_KEY_ATTR_MAX - 1)
+
+/**
+ * enum ovs_frag_type - IPv4 and IPv6 fragment type
+ * @OVS_FRAG_TYPE_NONE: Packet is not a fragment.
+ * @OVS_FRAG_TYPE_FIRST: Packet is a fragment with offset 0.
+ * @OVS_FRAG_TYPE_LATER: Packet is a fragment with nonzero offset.
+ *
+ * Used as the @ipv4_frag in &struct ovs_key_ipv4 and as @ipv6_frag &struct
+ * ovs_key_ipv6.
+ */
+enum ovs_frag_type {
+	OVS_FRAG_TYPE_NONE,
+	OVS_FRAG_TYPE_FIRST,
+	OVS_FRAG_TYPE_LATER,
+	__OVS_FRAG_TYPE_MAX
+};
+
+#define OVS_FRAG_TYPE_MAX (__OVS_FRAG_TYPE_MAX - 1)
+
+struct ovs_key_ethernet {
+	__u8	 eth_src[ETH_ALEN];
+	__u8	 eth_dst[ETH_ALEN];
+};
+
+struct ovs_key_ipv4 {
+	__be32 ipv4_src;
+	__be32 ipv4_dst;
+	__u8   ipv4_proto;
+	__u8   ipv4_tos;
+	__u8   ipv4_ttl;
+	__u8   ipv4_frag;	/* One of OVS_FRAG_TYPE_*. */
+};
+
+struct ovs_key_ipv6 {
+	__be32 ipv6_src[4];
+	__be32 ipv6_dst[4];
+	__be32 ipv6_label;	/* 20-bits in least-significant bits. */
+	__u8   ipv6_proto;
+	__u8   ipv6_tclass;
+	__u8   ipv6_hlimit;
+	__u8   ipv6_frag;	/* One of OVS_FRAG_TYPE_*. */
+};
+
+struct ovs_key_tcp {
+	__be16 tcp_src;
+	__be16 tcp_dst;
+};
+
+struct ovs_key_udp {
+	__be16 udp_src;
+	__be16 udp_dst;
+};
+
+struct ovs_key_icmp {
+	__u8 icmp_type;
+	__u8 icmp_code;
+};
+
+struct ovs_key_icmpv6 {
+	__u8 icmpv6_type;
+	__u8 icmpv6_code;
+};
+
+struct ovs_key_arp {
+	__be32 arp_sip;
+	__be32 arp_tip;
+	__be16 arp_op;
+	__u8   arp_sha[ETH_ALEN];
+	__u8   arp_tha[ETH_ALEN];
+};
+
+struct ovs_key_nd {
+	__u32 nd_target[4];
+	__u8  nd_sll[ETH_ALEN];
+	__u8  nd_tll[ETH_ALEN];
+};
+
+/**
+ * enum ovs_flow_attr - attributes for %OVS_FLOW_* commands.
+ * @OVS_FLOW_ATTR_KEY: Nested %OVS_KEY_ATTR_* attributes specifying the flow
+ * key.  Always present in notifications.  Required for all requests (except
+ * dumps).
+ * @OVS_FLOW_ATTR_ACTIONS: Nested %OVS_ACTION_ATTR_* attributes specifying
+ * the actions to take for packets that match the key.  Always present in
+ * notifications.  Required for %OVS_FLOW_CMD_NEW requests, optional for
+ * %OVS_FLOW_CMD_SET requests.
+ * @OVS_FLOW_ATTR_STATS: &struct ovs_flow_stats giving statistics for this
+ * flow.  Present in notifications if the stats would be nonzero.  Ignored in
+ * requests.
+ * @OVS_FLOW_ATTR_TCP_FLAGS: An 8-bit value giving the OR'd value of all of the
+ * TCP flags seen on packets in this flow.  Only present in notifications for
+ * TCP flows, and only if it would be nonzero.  Ignored in requests.
+ * @OVS_FLOW_ATTR_USED: A 64-bit integer giving the time, in milliseconds on
+ * the system monotonic clock, at which a packet was last processed for this
+ * flow.  Only present in notifications if a packet has been processed for this
+ * flow.  Ignored in requests.
+ * @OVS_FLOW_ATTR_CLEAR: If present in a %OVS_FLOW_CMD_SET request, clears the
+ * last-used time, accumulated TCP flags, and statistics for this flow.
+ * Otherwise ignored in requests.  Never present in notifications.
+ *
+ * These attributes follow the &struct ovs_header within the Generic Netlink
+ * payload for %OVS_FLOW_* commands.
+ */
+enum ovs_flow_attr {
+	OVS_FLOW_ATTR_UNSPEC,
+	OVS_FLOW_ATTR_KEY,       /* Sequence of OVS_KEY_ATTR_* attributes. */
+	OVS_FLOW_ATTR_ACTIONS,   /* Nested OVS_ACTION_ATTR_* attributes. */
+	OVS_FLOW_ATTR_STATS,     /* struct ovs_flow_stats. */
+	OVS_FLOW_ATTR_TCP_FLAGS, /* 8-bit OR'd TCP flags. */
+	OVS_FLOW_ATTR_USED,      /* u64 msecs last used in monotonic time. */
+	OVS_FLOW_ATTR_CLEAR,     /* Flag to clear stats, tcp_flags, used. */
+	__OVS_FLOW_ATTR_MAX
+};
+
+#define OVS_FLOW_ATTR_MAX (__OVS_FLOW_ATTR_MAX - 1)
+
+/**
+ * enum ovs_sample_attr - Attributes for %OVS_ACTION_ATTR_SAMPLE action.
+ * @OVS_SAMPLE_ATTR_PROBABILITY: 32-bit fraction of packets to sample with
+ * @OVS_ACTION_ATTR_SAMPLE.  A value of 0 samples no packets, a value of
+ * %UINT32_MAX samples all packets and intermediate values sample intermediate
+ * fractions of packets.
+ * @OVS_SAMPLE_ATTR_ACTIONS: Set of actions to execute in sampling event.
+ * Actions are passed as nested attributes.
+ *
+ * Executes the specified actions with the given probability on a per-packet
+ * basis.
+ */
+enum ovs_sample_attr {
+	OVS_SAMPLE_ATTR_UNSPEC,
+	OVS_SAMPLE_ATTR_PROBABILITY, /* u32 number */
+	OVS_SAMPLE_ATTR_ACTIONS,     /* Nested OVS_ACTION_ATTR_* attributes. */
+	__OVS_SAMPLE_ATTR_MAX,
+};
+
+#define OVS_SAMPLE_ATTR_MAX (__OVS_SAMPLE_ATTR_MAX - 1)
+
+/**
+ * enum ovs_userspace_attr - Attributes for %OVS_ACTION_ATTR_USERSPACE action.
+ * @OVS_USERSPACE_ATTR_PID: u32 Netlink PID to which the %OVS_PACKET_CMD_ACTION
+ * message should be sent.  Required.
+ * @OVS_USERSPACE_ATTR_USERDATA: If present, its variable-length argument is
+ * copied to the %OVS_PACKET_CMD_ACTION message as %OVS_PACKET_ATTR_USERDATA.
+ */
+enum ovs_userspace_attr {
+	OVS_USERSPACE_ATTR_UNSPEC,
+	OVS_USERSPACE_ATTR_PID,	      /* u32 Netlink PID to receive upcalls. */
+	OVS_USERSPACE_ATTR_USERDATA,  /* Optional user-specified cookie. */
+	__OVS_USERSPACE_ATTR_MAX
+};
+
+#define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
+
+/**
+ * struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
+ * @vlan_tpid: Tag protocol identifier (TPID) to push.
+ * @vlan_tci: Tag control identifier (TCI) to push.  The CFI bit must be set
+ * (but it will not be set in the 802.1Q header that is pushed).
+ *
+ * The @vlan_tpid value is typically %ETH_P_8021Q.  The only acceptable TPID
+ * values are those that the kernel module also parses as 802.1Q headers, to
+ * prevent %OVS_ACTION_ATTR_PUSH_VLAN followed by %OVS_ACTION_ATTR_POP_VLAN
+ * from having surprising results.
+ */
+struct ovs_action_push_vlan {
+	__be16 vlan_tpid;	/* 802.1Q TPID. */
+	__be16 vlan_tci;	/* 802.1Q TCI (VLAN ID and priority). */
+};
+
+/**
+ * enum ovs_action_attr - Action types.
+ *
+ * @OVS_ACTION_ATTR_OUTPUT: Output packet to port.
+ * @OVS_ACTION_ATTR_USERSPACE: Send packet to userspace according to nested
+ * %OVS_USERSPACE_ATTR_* attributes.
+ * @OVS_ACTION_ATTR_SET: Replaces the contents of an existing header.  The
+ * single nested %OVS_KEY_ATTR_* attribute specifies a header to modify and its
+ * value.
+ * @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q header onto the
+ * packet.
+ * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q header off the packet.
+ * @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
+ * the nested %OVS_SAMPLE_ATTR_* attributes.
+ *
+ * Only a single header can be set with a single %OVS_ACTION_ATTR_SET.  Not all
+ * fields within a header are modifiable, e.g. the IPv4 protocol and fragment
+ * type may not be changed.
+ */
+
+enum ovs_action_attr {
+	OVS_ACTION_ATTR_UNSPEC,
+	OVS_ACTION_ATTR_OUTPUT,	      /* u32 port number. */
+	OVS_ACTION_ATTR_USERSPACE,    /* Nested OVS_USERSPACE_ATTR_*. */
+	OVS_ACTION_ATTR_SET,          /* One nested OVS_KEY_ATTR_*. */
+	OVS_ACTION_ATTR_PUSH_VLAN,    /* struct ovs_action_push_vlan. */
+	OVS_ACTION_ATTR_POP_VLAN,     /* No argument. */
+	OVS_ACTION_ATTR_SAMPLE,       /* Nested OVS_SAMPLE_ATTR_*. */
+	__OVS_ACTION_ATTR_MAX
+};
+
+#define OVS_ACTION_ATTR_MAX (__OVS_ACTION_ATTR_MAX - 1)
+
+#endif /* _LINUX_OPENVSWITCH_H */