/*
   Copyright (C) 2012 Red Hat, Inc.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

#ifndef _H_MIGRATION_PROTOCOL
#define _H_MIGRATION_PROTOCOL

/* ************************************************
 * src-server to dst-server migration data messages
 * ************************************************/

/* increase the version when the version of any
 * of the migration data messages is increased */
#define SPICE_MIGRATION_PROTOCOL_VERSION ~0

typedef struct __attribute__ ((__packed__)) SpiceMigrateDataHeader {
    uint32_t magic;
    uint32_t version;
} SpiceMigrateDataHeader;

/* ********************
 * Char device base
 * *******************/

/* increase the version of descendent char devices when this
 * version is increased */
#define SPICE_MIGRATE_DATA_CHAR_DEVICE_VERSION 1

/* Should be the first field of any of the char_devices migration data (see write_data_ptr) */
typedef struct __attribute__ ((__packed__)) SpiceMigrateDataCharDevice {
    uint32_t version;
    uint8_t connected;
    uint32_t num_client_tokens;
    uint32_t num_send_tokens;
    uint32_t write_size; /* write to dev */
    uint32_t write_num_client_tokens; /* how many messages from the client are part of the write_data */
    uint32_t write_data_ptr; /* offset from
                                SpiceMigrateDataCharDevice - sizeof(SpiceMigrateDataHeader) */
} SpiceMigrateDataCharDevice;

/* ********
 * spicevmc
 * ********/

#define SPICE_MIGRATE_DATA_SPICEVMC_VERSION 1 /* NOTE: increase version when CHAR_DEVICE_VERSION
                                                 is increased */
#define SPICE_MIGRATE_DATA_SPICEVMC_MAGIC (*(uint32_t *)"SVMD")
typedef struct __attribute__ ((__packed__)) SpiceMigrateDataSpiceVmc {
    SpiceMigrateDataCharDevice base;
} SpiceMigrateDataSpiceVmc;

static inline int migration_protocol_validate_header(SpiceMigrateDataHeader *header,
                                                     uint32_t magic,
                                                     uint32_t version)
{
    if (header->magic != magic) {
        spice_error("bad magic %u (!= %u)", header->magic, magic);
        return FALSE;
    }
    if (header->version > version) {
        spice_error("unsupported version %u (> %u)", header->version, version);
        return FALSE;
    }
    return TRUE;
}

#endif