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/*

 * 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"

#include "pci.h"

#define ETH_ALEN    6

/* 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 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_S_LINK_UP    1       /* Link is up */

#define TX_TIMER_INTERVAL 150000 /* 150 us */

/* Limit the number of packets that can be sent via a single flush

 * of the TX queue.  This gives us a guaranteed exit condition and

 * ensures fairness in the io path.  256 conveniently matches the

 * length of the TX queue and shows a good balance of performance

 * and latency. */

#define TX_BURST 256

typedef struct virtio_net_conf

{

    uint32_t txtimer;

    int32_t txburst;

    char *tx;

} virtio_net_conf;

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

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

struct virtio_net_config

{

    /* The config defining mac address ($ETH_ALEN bytes) */

    uint8_t mac[ETH_ALEN];

    /* See VIRTIO_NET_F_STATUS and VIRTIO_NET_S_* above */

    uint16_t status;

} __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 */

};

/*

 * 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 {

    uint8_t class;

    uint8_t cmd;

};

typedef uint8_t 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_MODE    0

 #define VIRTIO_NET_CTRL_RX_MODE_PROMISC      0

 #define VIRTIO_NET_CTRL_RX_MODE_ALLMULTI     1

 #define VIRTIO_NET_CTRL_RX_MODE_ALLUNI       2

 #define VIRTIO_NET_CTRL_RX_MODE_NOMULTI      3

 #define VIRTIO_NET_CTRL_RX_MODE_NOUNI        4

 #define VIRTIO_NET_CTRL_RX_MODE_NOBCAST      5

/*

 * Control the MAC filter table.

 *

 * 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.

 */

struct virtio_net_ctrl_mac {

    uint32_t entries;

    uint8_t macs[][ETH_ALEN];

};

#define VIRTIO_NET_CTRL_MAC    1

 #define VIRTIO_NET_CTRL_MAC_TABLE_SET        0

/*

 * 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

#define DEFINE_VIRTIO_NET_FEATURES(_state, _field) \

        DEFINE_VIRTIO_COMMON_FEATURES(_state, _field), \

        DEFINE_PROP_BIT("csum", _state, _field, VIRTIO_NET_F_CSUM, true), \

        DEFINE_PROP_BIT("guest_csum", _state, _field, VIRTIO_NET_F_GUEST_CSUM, true), \

        DEFINE_PROP_BIT("gso", _state, _field, VIRTIO_NET_F_GSO, true), \

        DEFINE_PROP_BIT("guest_tso4", _state, _field, VIRTIO_NET_F_GUEST_TSO4, true), \

        DEFINE_PROP_BIT("guest_tso6", _state, _field, VIRTIO_NET_F_GUEST_TSO6, true), \

        DEFINE_PROP_BIT("guest_ecn", _state, _field, VIRTIO_NET_F_GUEST_ECN, true), \

        DEFINE_PROP_BIT("guest_ufo", _state, _field, VIRTIO_NET_F_GUEST_UFO, true), \

        DEFINE_PROP_BIT("host_tso4", _state, _field, VIRTIO_NET_F_HOST_TSO4, true), \

        DEFINE_PROP_BIT("host_tso6", _state, _field, VIRTIO_NET_F_HOST_TSO6, true), \

        DEFINE_PROP_BIT("host_ecn", _state, _field, VIRTIO_NET_F_HOST_ECN, true), \

        DEFINE_PROP_BIT("host_ufo", _state, _field, VIRTIO_NET_F_HOST_UFO, true), \

        DEFINE_PROP_BIT("mrg_rxbuf", _state, _field, VIRTIO_NET_F_MRG_RXBUF, true), \

        DEFINE_PROP_BIT("status", _state, _field, VIRTIO_NET_F_STATUS, true), \

        DEFINE_PROP_BIT("ctrl_vq", _state, _field, VIRTIO_NET_F_CTRL_VQ, true), \

        DEFINE_PROP_BIT("ctrl_rx", _state, _field, VIRTIO_NET_F_CTRL_RX, true), \

        DEFINE_PROP_BIT("ctrl_vlan", _state, _field, VIRTIO_NET_F_CTRL_VLAN, true), \

        DEFINE_PROP_BIT("ctrl_rx_extra", _state, _field, VIRTIO_NET_F_CTRL_RX_EXTRA, true)

#endif