include/uapi/linux/virtio_net.h - kernel/msm-4.9 - Gitiles

 #ifndef _LINUX_VIRTIO_NET_H
 #define _LINUX_VIRTIO_NET_H
 /* This header is BSD licensed so anyone can use the definitions to implement
  * compatible drivers/servers.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of IBM nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE. */
 #include <linux/types.h>
 #include <linux/virtio_ids.h>
 #include <linux/virtio_config.h>
 #include <linux/virtio_types.h>
 #include <linux/if_ether.h>

 /* The feature bitmap for virtio net */
 #define VIRTIO_NET_F_CSUM	0	/* Host handles pkts w/ partial csum */
 #define VIRTIO_NET_F_GUEST_CSUM	1	/* Guest handles pkts w/ partial csum */
 #define VIRTIO_NET_F_MAC	5	/* Host has given MAC address. */
 #define VIRTIO_NET_F_GUEST_TSO4	7	/* Guest can handle TSOv4 in. */
 #define VIRTIO_NET_F_GUEST_TSO6	8	/* Guest can handle TSOv6 in. */
 #define VIRTIO_NET_F_GUEST_ECN	9	/* Guest can handle TSO[6] w/ ECN in. */
 #define VIRTIO_NET_F_GUEST_UFO	10	/* Guest can handle UFO in. */
 #define VIRTIO_NET_F_HOST_TSO4	11	/* Host can handle TSOv4 in. */
 #define VIRTIO_NET_F_HOST_TSO6	12	/* Host can handle TSOv6 in. */
 #define VIRTIO_NET_F_HOST_ECN	13	/* Host can handle TSO[6] w/ ECN in. */
 #define VIRTIO_NET_F_HOST_UFO	14	/* Host can handle UFO in. */
 #define VIRTIO_NET_F_MRG_RXBUF	15	/* Host can merge receive buffers. */
 #define VIRTIO_NET_F_STATUS	16	/* virtio_net_config.status available */
 #define VIRTIO_NET_F_CTRL_VQ	17	/* Control channel available */
 #define VIRTIO_NET_F_CTRL_RX	18	/* Control channel RX mode support */
 #define VIRTIO_NET_F_CTRL_VLAN	19	/* Control channel VLAN filtering */
 #define VIRTIO_NET_F_CTRL_RX_EXTRA 20	/* Extra RX mode control support */
 #define VIRTIO_NET_F_GUEST_ANNOUNCE 21	/* Guest can announce device on the
 					 * network */
 #define VIRTIO_NET_F_MQ	22	/* Device supports Receive Flow
 					 * Steering */
 #define VIRTIO_NET_F_CTRL_MAC_ADDR 23	/* Set MAC address */

 #ifndef VIRTIO_NET_NO_LEGACY
 #define VIRTIO_NET_F_GSO	6	/* Host handles pkts w/ any GSO type */
 #endif /* VIRTIO_NET_NO_LEGACY */

 #define VIRTIO_NET_S_LINK_UP	1	/* Link is up */
 #define VIRTIO_NET_S_ANNOUNCE	2	/* Announcement is needed */

 struct virtio_net_config {
 	/* The config defining mac address (if VIRTIO_NET_F_MAC) */
 	__u8 mac[ETH_ALEN];
 	/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
 	__u16 status;
 	/* Maximum number of each of transmit and receive queues;
 	 * see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
 	 * Legal values are between 1 and 0x8000
 	 */
 	__u16 max_virtqueue_pairs;
 } __attribute__((packed));

 /*
  * This header comes first in the scatter-gather list.  If you don't
  * specify GSO or CSUM features, you can simply ignore the header.
  *
  * This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
  * only flattened.
  */
 struct virtio_net_hdr_v1 {
 #define VIRTIO_NET_HDR_F_NEEDS_CSUM	1	/* Use csum_start, csum_offset */
 #define VIRTIO_NET_HDR_F_DATA_VALID	2	/* Csum is valid */
 	__u8 flags;
 #define VIRTIO_NET_HDR_GSO_NONE		0	/* Not a GSO frame */
 #define VIRTIO_NET_HDR_GSO_TCPV4	1	/* GSO frame, IPv4 TCP (TSO) */
 #define VIRTIO_NET_HDR_GSO_UDP		3	/* GSO frame, IPv4 UDP (UFO) */
 #define VIRTIO_NET_HDR_GSO_TCPV6	4	/* GSO frame, IPv6 TCP */
 #define VIRTIO_NET_HDR_GSO_ECN		0x80	/* TCP has ECN set */
 	__u8 gso_type;
 	__virtio16 hdr_len;	/* Ethernet + IP + tcp/udp hdrs */
 	__virtio16 gso_size;	/* Bytes to append to hdr_len per frame */
 	__virtio16 csum_start;	/* Position to start checksumming from */
 	__virtio16 csum_offset;	/* Offset after that to place checksum */
 	__virtio16 num_buffers;	/* Number of merged rx buffers */
 };

 #ifndef VIRTIO_NET_NO_LEGACY
 /* This header comes first in the scatter-gather list.
  * For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
  * be the first element of the scatter-gather list.  If you don't
  * specify GSO or CSUM features, you can simply ignore the header. */
 struct virtio_net_hdr {
 	/* See VIRTIO_NET_HDR_F_* */
 	__u8 flags;
 	/* See VIRTIO_NET_HDR_GSO_* */
 	__u8 gso_type;
 	__virtio16 hdr_len;		/* Ethernet + IP + tcp/udp hdrs */
 	__virtio16 gso_size;		/* Bytes to append to hdr_len per frame */
 	__virtio16 csum_start;	/* Position to start checksumming from */
 	__virtio16 csum_offset;	/* Offset after that to place checksum */
 };

 /* This is the version of the header to use when the MRG_RXBUF
  * feature has been negotiated. */
 struct virtio_net_hdr_mrg_rxbuf {
 	struct virtio_net_hdr hdr;
 	__virtio16 num_buffers;	/* Number of merged rx buffers */
 };
 #endif /* ...VIRTIO_NET_NO_LEGACY */

 /*
  * Control virtqueue data structures
  *
  * The control virtqueue expects a header in the first sg entry
  * and an ack/status response in the last entry.  Data for the
  * command goes in between.
  */
 struct virtio_net_ctrl_hdr {
 	__u8 class;
 	__u8 cmd;
 } __attribute__((packed));

 typedef __u8 virtio_net_ctrl_ack;

 #define VIRTIO_NET_OK     0
 #define VIRTIO_NET_ERR    1

 /*
  * Control the RX mode, ie. promisucous, allmulti, etc...
  * All commands require an "out" sg entry containing a 1 byte
  * state value, zero = disable, non-zero = enable.  Commands
  * 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
  * Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
  */
 #define VIRTIO_NET_CTRL_RX    0
  #define VIRTIO_NET_CTRL_RX_PROMISC      0
  #define VIRTIO_NET_CTRL_RX_ALLMULTI     1
  #define VIRTIO_NET_CTRL_RX_ALLUNI       2
  #define VIRTIO_NET_CTRL_RX_NOMULTI      3
  #define VIRTIO_NET_CTRL_RX_NOUNI        4
  #define VIRTIO_NET_CTRL_RX_NOBCAST      5

 /*
  * Control the MAC
  *
  * The MAC filter table is managed by the hypervisor, the guest should
  * assume the size is infinite.  Filtering should be considered
  * non-perfect, ie. based on hypervisor resources, the guest may
  * received packets from sources not specified in the filter list.
  *
  * In addition to the class/cmd header, the TABLE_SET command requires
  * two out scatterlists.  Each contains a 4 byte count of entries followed
  * by a concatenated byte stream of the ETH_ALEN MAC addresses.  The
  * first sg list contains unicast addresses, the second is for multicast.
  * This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
  * is available.
  *
  * The ADDR_SET command requests one out scatterlist, it contains a
  * 6 bytes MAC address. This functionality is present if the
  * VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
  */
 struct virtio_net_ctrl_mac {
 	__virtio32 entries;
 	__u8 macs[][ETH_ALEN];
 } __attribute__((packed));

 #define VIRTIO_NET_CTRL_MAC    1
  #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0
  #define VIRTIO_NET_CTRL_MAC_ADDR_SET         1

 /*
  * Control VLAN filtering
  *
  * The VLAN filter table is controlled via a simple ADD/DEL interface.
  * VLAN IDs not added may be filterd by the hypervisor.  Del is the
  * opposite of add.  Both commands expect an out entry containing a 2
  * byte VLAN ID.  VLAN filterting is available with the
  * VIRTIO_NET_F_CTRL_VLAN feature bit.
  */
 #define VIRTIO_NET_CTRL_VLAN       2
  #define VIRTIO_NET_CTRL_VLAN_ADD             0
  #define VIRTIO_NET_CTRL_VLAN_DEL             1

 /*
  * Control link announce acknowledgement
  *
  * The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
  * driver has recevied the notification; device would clear the
  * VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
  * this command.
  */
 #define VIRTIO_NET_CTRL_ANNOUNCE       3
  #define VIRTIO_NET_CTRL_ANNOUNCE_ACK         0

 /*
  * Control Receive Flow Steering
  *
  * The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
  * enables Receive Flow Steering, specifying the number of the transmit and
  * receive queues that will be used. After the command is consumed and acked by
  * the device, the device will not steer new packets on receive virtqueues
  * other than specified nor read from transmit virtqueues other than specified.
  * Accordingly, driver should not transmit new packets  on virtqueues other than
  * specified.
  */
 struct virtio_net_ctrl_mq {
 	__virtio16 virtqueue_pairs;
 };

 #define VIRTIO_NET_CTRL_MQ   4
  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET        0
  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN        1
  #define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX        0x8000

 #endif /* _LINUX_VIRTIO_NET_H */
	#ifndef _LINUX_VIRTIO_NET_H
	#define _LINUX_VIRTIO_NET_H
	/* This header is BSD licensed so anyone can use the definitions to implement
	* compatible drivers/servers.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of IBM nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE. */
	#include <linux/types.h>
	#include <linux/virtio_ids.h>
	#include <linux/virtio_config.h>
	#include <linux/virtio_types.h>
	#include <linux/if_ether.h>

	/* The feature bitmap for virtio net */
	#define VIRTIO_NET_F_CSUM 0 /* Host handles pkts w/ partial csum */
	#define VIRTIO_NET_F_GUEST_CSUM 1 /* Guest handles pkts w/ partial csum */
	#define VIRTIO_NET_F_MAC 5 /* Host has given MAC address. */
	#define VIRTIO_NET_F_GUEST_TSO4 7 /* Guest can handle TSOv4 in. */
	#define VIRTIO_NET_F_GUEST_TSO6 8 /* Guest can handle TSOv6 in. */
	#define VIRTIO_NET_F_GUEST_ECN 9 /* Guest can handle TSO[6] w/ ECN in. */
	#define VIRTIO_NET_F_GUEST_UFO 10 /* Guest can handle UFO in. */
	#define VIRTIO_NET_F_HOST_TSO4 11 /* Host can handle TSOv4 in. */
	#define VIRTIO_NET_F_HOST_TSO6 12 /* Host can handle TSOv6 in. */
	#define VIRTIO_NET_F_HOST_ECN 13 /* Host can handle TSO[6] w/ ECN in. */
	#define VIRTIO_NET_F_HOST_UFO 14 /* Host can handle UFO in. */
	#define VIRTIO_NET_F_MRG_RXBUF 15 /* Host can merge receive buffers. */
	#define VIRTIO_NET_F_STATUS 16 /* virtio_net_config.status available */
	#define VIRTIO_NET_F_CTRL_VQ 17 /* Control channel available */
	#define VIRTIO_NET_F_CTRL_RX 18 /* Control channel RX mode support */
	#define VIRTIO_NET_F_CTRL_VLAN 19 /* Control channel VLAN filtering */
	#define VIRTIO_NET_F_CTRL_RX_EXTRA 20 /* Extra RX mode control support */
	#define VIRTIO_NET_F_GUEST_ANNOUNCE 21 /* Guest can announce device on the
	* network */
	#define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow
	* Steering */
	#define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */

	#ifndef VIRTIO_NET_NO_LEGACY
	#define VIRTIO_NET_F_GSO 6 /* Host handles pkts w/ any GSO type */
	#endif /* VIRTIO_NET_NO_LEGACY */

	#define VIRTIO_NET_S_LINK_UP 1 /* Link is up */
	#define VIRTIO_NET_S_ANNOUNCE 2 /* Announcement is needed */

	struct virtio_net_config {
	/* The config defining mac address (if VIRTIO_NET_F_MAC) */
	__u8 mac[ETH_ALEN];
	/* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */
	__u16 status;
	/* Maximum number of each of transmit and receive queues;
	* see VIRTIO_NET_F_MQ and VIRTIO_NET_CTRL_MQ.
	* Legal values are between 1 and 0x8000
	*/
	__u16 max_virtqueue_pairs;
	} __attribute__((packed));

	/*
	* This header comes first in the scatter-gather list. If you don't
	* specify GSO or CSUM features, you can simply ignore the header.
	*
	* This is bitwise-equivalent to the legacy struct virtio_net_hdr_mrg_rxbuf,
	* only flattened.
	*/
	struct virtio_net_hdr_v1 {
	#define VIRTIO_NET_HDR_F_NEEDS_CSUM 1 /* Use csum_start, csum_offset */
	#define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
	__u8 flags;
	#define VIRTIO_NET_HDR_GSO_NONE 0 /* Not a GSO frame */
	#define VIRTIO_NET_HDR_GSO_TCPV4 1 /* GSO frame, IPv4 TCP (TSO) */
	#define VIRTIO_NET_HDR_GSO_UDP 3 /* GSO frame, IPv4 UDP (UFO) */
	#define VIRTIO_NET_HDR_GSO_TCPV6 4 /* GSO frame, IPv6 TCP */
	#define VIRTIO_NET_HDR_GSO_ECN 0x80 /* TCP has ECN set */
	__u8 gso_type;
	__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
	__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
	__virtio16 csum_start; /* Position to start checksumming from */
	__virtio16 csum_offset; /* Offset after that to place checksum */
	__virtio16 num_buffers; /* Number of merged rx buffers */
	};

	#ifndef VIRTIO_NET_NO_LEGACY
	/* This header comes first in the scatter-gather list.
	* For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated, it must
	* be the first element of the scatter-gather list. If you don't
	* specify GSO or CSUM features, you can simply ignore the header. */
	struct virtio_net_hdr {
	/* See VIRTIO_NET_HDR_F_* */
	__u8 flags;
	/* See VIRTIO_NET_HDR_GSO_* */
	__u8 gso_type;
	__virtio16 hdr_len; /* Ethernet + IP + tcp/udp hdrs */
	__virtio16 gso_size; /* Bytes to append to hdr_len per frame */
	__virtio16 csum_start; /* Position to start checksumming from */
	__virtio16 csum_offset; /* Offset after that to place checksum */
	};

	/* This is the version of the header to use when the MRG_RXBUF
	* feature has been negotiated. */
	struct virtio_net_hdr_mrg_rxbuf {
	struct virtio_net_hdr hdr;
	__virtio16 num_buffers; /* Number of merged rx buffers */
	};
	#endif /* ...VIRTIO_NET_NO_LEGACY */

	/*
	* Control virtqueue data structures
	*
	* The control virtqueue expects a header in the first sg entry
	* and an ack/status response in the last entry. Data for the
	* command goes in between.
	*/
	struct virtio_net_ctrl_hdr {
	__u8 class;
	__u8 cmd;
	} __attribute__((packed));

	typedef __u8 virtio_net_ctrl_ack;

	#define VIRTIO_NET_OK 0
	#define VIRTIO_NET_ERR 1

	/*
	* Control the RX mode, ie. promisucous, allmulti, etc...
	* All commands require an "out" sg entry containing a 1 byte
	* state value, zero = disable, non-zero = enable. Commands
	* 0 and 1 are supported with the VIRTIO_NET_F_CTRL_RX feature.
	* Commands 2-5 are added with VIRTIO_NET_F_CTRL_RX_EXTRA.
	*/
	#define VIRTIO_NET_CTRL_RX 0
	#define VIRTIO_NET_CTRL_RX_PROMISC 0
	#define VIRTIO_NET_CTRL_RX_ALLMULTI 1
	#define VIRTIO_NET_CTRL_RX_ALLUNI 2
	#define VIRTIO_NET_CTRL_RX_NOMULTI 3
	#define VIRTIO_NET_CTRL_RX_NOUNI 4
	#define VIRTIO_NET_CTRL_RX_NOBCAST 5

	/*
	* Control the MAC
	*
	* The MAC filter table is managed by the hypervisor, the guest should
	* assume the size is infinite. Filtering should be considered
	* non-perfect, ie. based on hypervisor resources, the guest may
	* received packets from sources not specified in the filter list.
	*
	* In addition to the class/cmd header, the TABLE_SET command requires
	* two out scatterlists. Each contains a 4 byte count of entries followed
	* by a concatenated byte stream of the ETH_ALEN MAC addresses. The
	* first sg list contains unicast addresses, the second is for multicast.
	* This functionality is present if the VIRTIO_NET_F_CTRL_RX feature
	* is available.
	*
	* The ADDR_SET command requests one out scatterlist, it contains a
	* 6 bytes MAC address. This functionality is present if the
	* VIRTIO_NET_F_CTRL_MAC_ADDR feature is available.
	*/
	struct virtio_net_ctrl_mac {
	__virtio32 entries;
	__u8 macs[][ETH_ALEN];
	} __attribute__((packed));

	#define VIRTIO_NET_CTRL_MAC 1
	#define VIRTIO_NET_CTRL_MAC_TABLE_SET 0
	#define VIRTIO_NET_CTRL_MAC_ADDR_SET 1

	/*
	* Control VLAN filtering
	*
	* The VLAN filter table is controlled via a simple ADD/DEL interface.
	* VLAN IDs not added may be filterd by the hypervisor. Del is the
	* opposite of add. Both commands expect an out entry containing a 2
	* byte VLAN ID. VLAN filterting is available with the
	* VIRTIO_NET_F_CTRL_VLAN feature bit.
	*/
	#define VIRTIO_NET_CTRL_VLAN 2
	#define VIRTIO_NET_CTRL_VLAN_ADD 0
	#define VIRTIO_NET_CTRL_VLAN_DEL 1

	/*
	* Control link announce acknowledgement
	*
	* The command VIRTIO_NET_CTRL_ANNOUNCE_ACK is used to indicate that
	* driver has recevied the notification; device would clear the
	* VIRTIO_NET_S_ANNOUNCE bit in the status field after it receives
	* this command.
	*/
	#define VIRTIO_NET_CTRL_ANNOUNCE 3
	#define VIRTIO_NET_CTRL_ANNOUNCE_ACK 0

	/*
	* Control Receive Flow Steering
	*
	* The command VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
	* enables Receive Flow Steering, specifying the number of the transmit and
	* receive queues that will be used. After the command is consumed and acked by
	* the device, the device will not steer new packets on receive virtqueues
	* other than specified nor read from transmit virtqueues other than specified.
	* Accordingly, driver should not transmit new packets on virtqueues other than
	* specified.
	*/
	struct virtio_net_ctrl_mq {
	__virtio16 virtqueue_pairs;
	};

	#define VIRTIO_NET_CTRL_MQ 4
	#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET 0
	#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MIN 1
	#define VIRTIO_NET_CTRL_MQ_VQ_PAIRS_MAX 0x8000

	#endif /* _LINUX_VIRTIO_NET_H */