/*

 * Virtio Network Device

 *

 * Copyright IBM, Corp. 2007

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 */

#ifndef _QEMU_VIRTIO_NET_H

#define _QEMU_VIRTIO_NET_H

#include "virtio.h"

#include "net.h"

/* from Linux's virtio_net.h */

/* The ID for virtio_net */

#define VIRTIO_ID_NET   1

/* 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_GSO        6       /* Host handles pkts w/ any GSO type */

#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 TX_TIMER_INTERVAL 150000 /* 150 us */

/* Maximum packet size we can receive from tap device: header + 64k */

#define VIRTIO_NET_MAX_BUFSIZE (sizeof(struct virtio_net_hdr) + (64 << 10))

/* The config defining mac address (6 bytes) */

struct virtio_net_config

{

    uint8_t mac[6];

} __attribute__((packed));

/* This is 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

{

#define VIRTIO_NET_HDR_F_NEEDS_CSUM     1       // Use csum_start, csum_offset

    uint8_t 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

    uint8_t gso_type;

    uint16_t hdr_len;

    uint16_t gso_size;

    uint16_t csum_start;

    uint16_t csum_offset;

};

/* 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;

    uint16_t num_buffers;   /* Number of merged rx buffers */

};

void virtio_net_init(VirtIOBindFn bind, void *bind_arg, NICInfo *nd);

#endif