configure: Modernize configure.ac a bit

[mirror_corosync.git] / exec / totempg.c

/*
 * Copyright (c) 2003-2005 MontaVista Software, Inc.
 * Copyright (c) 2005 OSDL.
 * Copyright (c) 2006-2012 Red Hat, Inc.
 *
 * All rights reserved.
 *
 * Author: Steven Dake (sdake@redhat.com)
 * Author: Mark Haverkamp (markh@osdl.org)
 *
 * This software licensed under BSD license, the text of which follows:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - 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.
 * - Neither the name of the MontaVista Software, Inc. 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 THE COPYRIGHT OWNER 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.
 */

/*
 * FRAGMENTATION AND PACKING ALGORITHM:
 *
 * Assemble the entire message into one buffer
 * if full fragment
 *       store fragment into lengths list
 *      for each full fragment
 *              multicast fragment
 *              set length and fragment fields of pg mesage
 *      store remaining multicast into head of fragmentation data and set lens field
 *
 * If a message exceeds the maximum packet size allowed by the totem
 * single ring protocol, the protocol could lose forward progress.
 * Statically calculating the allowed data amount doesn't work because
 * the amount of data allowed depends on the number of fragments in
 * each message.  In this implementation, the maximum fragment size
 * is dynamically calculated for each fragment added to the message.

 * It is possible for a message to be two bytes short of the maximum
 * packet size.  This occurs when a message or collection of
 * messages + the mcast header + the lens are two bytes short of the
 * end of the packet.  Since another len field consumes two bytes, the
 * len field would consume the rest of the packet without room for data.
 *
 * One optimization would be to forgo the final len field and determine
 * it from the size of the udp datagram.  Then this condition would no
 * longer occur.
 */

/*
 * ASSEMBLY AND UNPACKING ALGORITHM:
 *
 * copy incoming packet into assembly data buffer indexed by current
 * location of end of fragment
 *
 * if not fragmented
 *      deliver all messages in assembly data buffer
 * else
 * if msg_count > 1 and fragmented
 *      deliver all messages except last message in assembly data buffer
 *      copy last fragmented section to start of assembly data buffer
 * else
 * if msg_count = 1 and fragmented
 *      do nothing
 *
 */

#include <config.h>

#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/uio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <pthread.h>
#include <errno.h>
#include <limits.h>

#include <corosync/swab.h>
#include <qb/qblist.h>
#include <qb/qbloop.h>
#include <qb/qbipcs.h>
#include <corosync/totem/totempg.h>
#define LOGSYS_UTILS_ONLY 1
#include <corosync/logsys.h>

#include "util.h"
#include "totemsrp.h"

struct totempg_mcast_header {
        short version;
        short type;
};

#if !(defined(__i386__) || defined(__x86_64__))
/*
 * Need align on architectures different then i386 or x86_64
 */
#define TOTEMPG_NEED_ALIGN 1
#endif

/*
 * totempg_mcast structure
 *
 * header:                              Identify the mcast.
 * fragmented:                  Set if this message continues into next message
 * continuation:                Set if this message is a continuation from last message
 * msg_count                    Indicates how many packed messages are contained
 *                                              in the mcast.
 * Also, the size of each packed message and the messages themselves are
 * appended to the end of this structure when sent.
 */
struct totempg_mcast {
        struct totempg_mcast_header header;
        unsigned char fragmented;
        unsigned char continuation;
        unsigned short msg_count;
        /*
         * short msg_len[msg_count];
         */
        /*
         * data for messages
         */
};

/*
 * Maximum packet size for totem pg messages
 */
#define TOTEMPG_PACKET_SIZE (totempg_totem_config->net_mtu - \
        sizeof (struct totempg_mcast))

/*
 * Local variables used for packing small messages
 */
static unsigned short mcast_packed_msg_lens[FRAME_SIZE_MAX];

static int mcast_packed_msg_count = 0;

static int totempg_reserved = 1;

static unsigned int totempg_size_limit;

static totem_queue_level_changed_fn totem_queue_level_changed = NULL;

static uint32_t totempg_threaded_mode = 0;

static void *totemsrp_context;

/*
 * Function and data used to log messages
 */
static int totempg_log_level_security;
static int totempg_log_level_error;
static int totempg_log_level_warning;
static int totempg_log_level_notice;
static int totempg_log_level_debug;
static int totempg_subsys_id;
static void (*totempg_log_printf) (
        int level,
        int subsys,
        const char *function,
        const char *file,
        int line,
        const char *format, ...) __attribute__((format(printf, 6, 7)));

struct totem_config *totempg_totem_config;

static totempg_stats_t totempg_stats;

enum throw_away_mode {
        THROW_AWAY_INACTIVE,
        THROW_AWAY_ACTIVE
};

struct assembly {
        unsigned int nodeid;
        unsigned char data[MESSAGE_SIZE_MAX+KNET_MAX_PACKET_SIZE];
        int index;
        unsigned char last_frag_num;
        enum throw_away_mode throw_away_mode;
        struct qb_list_head list;
};

static void assembly_deref (struct assembly *assembly);

static int callback_token_received_fn (enum totem_callback_token_type type,
        const void *data);

QB_LIST_DECLARE(assembly_list_inuse);

/*
 * Free list is used both for transitional and operational assemblies
 */
QB_LIST_DECLARE(assembly_list_free);

QB_LIST_DECLARE(assembly_list_inuse_trans);

QB_LIST_DECLARE(totempg_groups_list);

/*
 * Staging buffer for packed messages.  Messages are staged in this buffer
 * before sending.  Multiple messages may fit which cuts down on the
 * number of mcasts sent.  If a message doesn't completely fit, then
 * the mcast header has a fragment bit set that says that there are more
 * data to follow.  fragment_size is an index into the buffer.  It indicates
 * the size of message data and where to place new message data.
 * fragment_contuation indicates whether the first packed message in
 * the buffer is a continuation of a previously packed fragment.
 */
static unsigned char *fragmentation_data;

static int fragment_size = 0;

static int fragment_continuation = 0;

static int totempg_waiting_transack = 0;

struct totempg_group_instance {
        void (*deliver_fn) (
                unsigned int nodeid,
                const void *msg,
                unsigned int msg_len,
                int endian_conversion_required);

        void (*confchg_fn) (
                enum totem_configuration_type configuration_type,
                const unsigned int *member_list, size_t member_list_entries,
                const unsigned int *left_list, size_t left_list_entries,
                const unsigned int *joined_list, size_t joined_list_entries,
                const struct memb_ring_id *ring_id);

        struct totempg_group *groups;

        int groups_cnt;
        int32_t q_level;

        struct qb_list_head list;
};

static unsigned char next_fragment = 1;

static pthread_mutex_t totempg_mutex = PTHREAD_MUTEX_INITIALIZER;

static pthread_mutex_t callback_token_mutex = PTHREAD_MUTEX_INITIALIZER;

static pthread_mutex_t mcast_msg_mutex = PTHREAD_MUTEX_INITIALIZER;

#define log_printf(level, format, args...)                      \
do {                                                            \
        totempg_log_printf(level,                               \
                           totempg_subsys_id,                   \
                           __FUNCTION__, __FILE__, __LINE__,    \
                           format, ##args);                     \
} while (0);

static int msg_count_send_ok (int msg_count);

static int byte_count_send_ok (int byte_count);

static void totempg_waiting_trans_ack_cb (int waiting_trans_ack)
{
        log_printf(LOG_DEBUG, "waiting_trans_ack changed to %u", waiting_trans_ack);
        totempg_waiting_transack = waiting_trans_ack;
}

static struct assembly *assembly_ref (unsigned int nodeid)
{
        struct assembly *assembly;
        struct qb_list_head *list;
        struct qb_list_head *active_assembly_list_inuse;

        if (totempg_waiting_transack) {
                active_assembly_list_inuse = &assembly_list_inuse_trans;
        } else {
                active_assembly_list_inuse = &assembly_list_inuse;
        }

        /*
         * Search inuse list for node id and return assembly buffer if found
         */
        qb_list_for_each(list, active_assembly_list_inuse) {
                assembly = qb_list_entry (list, struct assembly, list);

                if (nodeid == assembly->nodeid) {
                        return (assembly);
                }
        }

        /*
         * Nothing found in inuse list get one from free list if available
         */
        if (qb_list_empty (&assembly_list_free) == 0) {
                assembly = qb_list_first_entry (&assembly_list_free, struct assembly, list);
                qb_list_del (&assembly->list);
                qb_list_add (&assembly->list, active_assembly_list_inuse);
                assembly->nodeid = nodeid;
                assembly->index = 0;
                assembly->last_frag_num = 0;
                assembly->throw_away_mode = THROW_AWAY_INACTIVE;
                return (assembly);
        }

        /*
         * Nothing available in inuse or free list, so allocate a new one
         */
        assembly = malloc (sizeof (struct assembly));
        /*
         * TODO handle memory allocation failure here
         */
        assert (assembly);
        assembly->nodeid = nodeid;
        assembly->data[0] = 0;
        assembly->index = 0;
        assembly->last_frag_num = 0;
        assembly->throw_away_mode = THROW_AWAY_INACTIVE;
        qb_list_init (&assembly->list);
        qb_list_add (&assembly->list, active_assembly_list_inuse);

        return (assembly);
}

static void assembly_deref (struct assembly *assembly)
{
        qb_list_del (&assembly->list);
        qb_list_add (&assembly->list, &assembly_list_free);
}

static void assembly_deref_from_normal_and_trans (int nodeid)
{
        int j;
        struct qb_list_head *list, *tmp_iter;
        struct qb_list_head *active_assembly_list_inuse;
        struct assembly *assembly;

        for (j = 0; j < 2; j++) {
                if (j == 0) {
                        active_assembly_list_inuse = &assembly_list_inuse;
                } else {
                        active_assembly_list_inuse = &assembly_list_inuse_trans;
                }

                qb_list_for_each_safe(list, tmp_iter, active_assembly_list_inuse) {
                        assembly = qb_list_entry (list, struct assembly, list);

                        if (nodeid == assembly->nodeid) {
                                qb_list_del (&assembly->list);
                                qb_list_add (&assembly->list, &assembly_list_free);
                        }
                }
        }

}

static inline void app_confchg_fn (
        enum totem_configuration_type configuration_type,
        const unsigned int *member_list, size_t member_list_entries,
        const unsigned int *left_list, size_t left_list_entries,
        const unsigned int *joined_list, size_t joined_list_entries,
        const struct memb_ring_id *ring_id)
{
        int i;
        struct totempg_group_instance *instance;
        struct qb_list_head *list;

        /*
         * For every leaving processor, add to free list
         * This also has the side effect of clearing out the dataset
         * In the leaving processor's assembly buffer.
         */
        for (i = 0; i < left_list_entries; i++) {
                assembly_deref_from_normal_and_trans (left_list[i]);
        }

        qb_list_for_each(list, &totempg_groups_list) {
                instance = qb_list_entry (list, struct totempg_group_instance, list);

                if (instance->confchg_fn) {
                        instance->confchg_fn (
                                configuration_type,
                                member_list,
                                member_list_entries,
                                left_list,
                                left_list_entries,
                                joined_list,
                                joined_list_entries,
                                ring_id);
                }
        }
}

static inline void group_endian_convert (
        void *msg,
        int msg_len)
{
        unsigned short *group_len;
        int i;
        char *aligned_msg;

#ifdef TOTEMPG_NEED_ALIGN
        /*
         * Align data structure for not i386 or x86_64
         */
        if ((size_t)msg % sizeof(char *) != 0) {
                aligned_msg = alloca(msg_len);
                memcpy(aligned_msg, msg, msg_len);
        } else {
                aligned_msg = msg;
        }
#else
        aligned_msg = msg;
#endif

        group_len = (unsigned short *)aligned_msg;
        group_len[0] = swab16(group_len[0]);
        for (i = 1; i < group_len[0] + 1; i++) {
                group_len[i] = swab16(group_len[i]);
        }

        if (aligned_msg != msg) {
                memcpy(msg, aligned_msg, msg_len);
        }
}

static inline int group_matches (
        struct iovec *iovec,
        unsigned int iov_len,
        struct totempg_group *groups_b,
        unsigned int group_b_cnt,
        unsigned int *adjust_iovec)
{
        unsigned short *group_len;
        char *group_name;
        int i;
        int j;
#ifdef TOTEMPG_NEED_ALIGN
        struct iovec iovec_aligned = { NULL, 0 };
#endif

        assert (iov_len == 1);

#ifdef TOTEMPG_NEED_ALIGN
        /*
         * Align data structure for not i386 or x86_64
         */
        if ((size_t)iovec->iov_base % sizeof(char *) != 0) {
                iovec_aligned.iov_base = alloca(iovec->iov_len);
                memcpy(iovec_aligned.iov_base, iovec->iov_base, iovec->iov_len);
                iovec_aligned.iov_len = iovec->iov_len;
                iovec = &iovec_aligned;
        }
#endif

        group_len = (unsigned short *)iovec->iov_base;
        group_name = ((char *)iovec->iov_base) +
                sizeof (unsigned short) * (group_len[0] + 1);


        /*
         * Calculate amount to adjust the iovec by before delivering to app
         */
        *adjust_iovec = sizeof (unsigned short) * (group_len[0] + 1);
        for (i = 1; i < group_len[0] + 1; i++) {
                *adjust_iovec += group_len[i];
        }

        /*
         * Determine if this message should be delivered to this instance
         */
        for (i = 1; i < group_len[0] + 1; i++) {
                for (j = 0; j < group_b_cnt; j++) {
                        if ((group_len[i] == groups_b[j].group_len) &&
                                (memcmp (groups_b[j].group, group_name, group_len[i]) == 0)) {
                                return (1);
                        }
                }
                group_name += group_len[i];
        }
        return (0);
}


static inline void app_deliver_fn (
        unsigned int nodeid,
        void *msg,
        unsigned int msg_len,
        int endian_conversion_required)
{
        struct totempg_group_instance *instance;
        struct iovec stripped_iovec;
        unsigned int adjust_iovec;
        struct iovec *iovec;
        struct qb_list_head *list;

        struct iovec aligned_iovec = { NULL, 0 };

        if (endian_conversion_required) {
                group_endian_convert (msg, msg_len);
        }

        /*
         * TODO: segmentation/assembly need to be redesigned to provide aligned access
         * in all cases to avoid memory copies on non386 archs. Probably broke backwars
         * compatibility
         */

#ifdef TOTEMPG_NEED_ALIGN
        /*
         * Align data structure for not i386 or x86_64
         */
        aligned_iovec.iov_base = alloca(msg_len);
        aligned_iovec.iov_len = msg_len;
        memcpy(aligned_iovec.iov_base, msg, msg_len);
#else
        aligned_iovec.iov_base = msg;
        aligned_iovec.iov_len = msg_len;
#endif

        iovec = &aligned_iovec;

        qb_list_for_each(list, &totempg_groups_list) {
                instance = qb_list_entry (list, struct totempg_group_instance, list);
                if (group_matches (iovec, 1, instance->groups, instance->groups_cnt, &adjust_iovec)) {
                        stripped_iovec.iov_len = iovec->iov_len - adjust_iovec;
                        stripped_iovec.iov_base = (char *)iovec->iov_base + adjust_iovec;

#ifdef TOTEMPG_NEED_ALIGN
                        /*
                         * Align data structure for not i386 or x86_64
                         */
                        if ((uintptr_t)((char *)iovec->iov_base + adjust_iovec) % (sizeof(char *)) != 0) {
                                /*
                                 * Deal with misalignment
                                 */
                                stripped_iovec.iov_base =
                                        alloca (stripped_iovec.iov_len);
                                memcpy (stripped_iovec.iov_base,
                                         (char *)iovec->iov_base + adjust_iovec,
                                        stripped_iovec.iov_len);
                        }
#endif
                        instance->deliver_fn (
                                nodeid,
                                stripped_iovec.iov_base,
                                stripped_iovec.iov_len,
                                endian_conversion_required);
                }
        }
}

static void totempg_confchg_fn (
        enum totem_configuration_type configuration_type,
        const unsigned int *member_list, size_t member_list_entries,
        const unsigned int *left_list, size_t left_list_entries,
        const unsigned int *joined_list, size_t joined_list_entries,
        const struct memb_ring_id *ring_id)
{
// TODO optimize this
        app_confchg_fn (configuration_type,
                member_list, member_list_entries,
                left_list, left_list_entries,
                joined_list, joined_list_entries,
                ring_id);
}

static void totempg_deliver_fn (
        unsigned int nodeid,
        const void *msg,
        unsigned int msg_len,
        int endian_conversion_required)
{
        struct totempg_mcast *mcast;
        unsigned short *msg_lens;
        int i;
        struct assembly *assembly;
        char header[FRAME_SIZE_MAX];
        int msg_count;
        int continuation;
        int start;
        const char *data;
        int datasize;
        struct iovec iov_delv;
        size_t expected_msg_len;

        assembly = assembly_ref (nodeid);
        assert (assembly);

        if (msg_len < sizeof(struct totempg_mcast)) {
                log_printf(LOG_WARNING,
                    "Message (totempg_mcast) received from node " CS_PRI_NODE_ID " is too short...  Ignoring.", nodeid);

                return ;
        }

        /*
         * Assemble the header into one block of data and
         * assemble the packet contents into one block of data to simplify delivery
         */

        mcast = (struct totempg_mcast *)msg;
        if (endian_conversion_required) {
                mcast->msg_count = swab16 (mcast->msg_count);
        }

        msg_count = mcast->msg_count;
        datasize = sizeof (struct totempg_mcast) +
                msg_count * sizeof (unsigned short);

        if (msg_len < datasize) {
                log_printf(LOG_WARNING,
                    "Message (totempg_mcast datasize) received from node " CS_PRI_NODE_ID
                    " is too short...  Ignoring.", nodeid);

                return ;
        }

        memcpy (header, msg, datasize);
        data = msg;

        msg_lens = (unsigned short *) (header + sizeof (struct totempg_mcast));
        expected_msg_len = datasize;
        for (i = 0; i < mcast->msg_count; i++) {
                if (endian_conversion_required) {
                        msg_lens[i] = swab16 (msg_lens[i]);
                }

                expected_msg_len += msg_lens[i];
        }

        if (msg_len != expected_msg_len) {
                log_printf(LOG_WARNING,
                    "Message (totempg_mcast) received from node " CS_PRI_NODE_ID
                    " doesn't have expected length of %zu (has %u) bytes...  Ignoring.",
                    nodeid, expected_msg_len, msg_len);

                return ;
        }

        assert((assembly->index+msg_len) < sizeof(assembly->data));
        memcpy (&assembly->data[assembly->index], &data[datasize],
                msg_len - datasize);

        /*
         * If the last message in the buffer is a fragment, then we
         * can't deliver it.  We'll first deliver the full messages
         * then adjust the assembly buffer so we can add the rest of the
         * fragment when it arrives.
         */
        msg_count = mcast->fragmented ? mcast->msg_count - 1 : mcast->msg_count;
        continuation = mcast->continuation;
        iov_delv.iov_base = (void *)&assembly->data[0];
        iov_delv.iov_len = assembly->index + msg_lens[0];

        /*
         * Make sure that if this message is a continuation, that it
         * matches the sequence number of the previous fragment.
         * Also, if the first packed message is a continuation
         * of a previous message, but the assembly buffer
         * is empty, then we need to discard it since we can't
         * assemble a complete message. Likewise, if this message isn't a
         * continuation and the assembly buffer is empty, we have to discard
         * the continued message.
         */
        start = 0;

        if (assembly->throw_away_mode == THROW_AWAY_ACTIVE) {
                 /* Throw away the first msg block */
                if (mcast->fragmented == 0 || mcast->fragmented == 1) {
                        assembly->throw_away_mode = THROW_AWAY_INACTIVE;

                        assembly->index += msg_lens[0];
                        iov_delv.iov_base = (void *)&assembly->data[assembly->index];
                        iov_delv.iov_len = msg_lens[1];
                        start = 1;
                }
        } else
        if (assembly->throw_away_mode == THROW_AWAY_INACTIVE) {
                if (continuation == assembly->last_frag_num) {
                        assembly->last_frag_num = mcast->fragmented;
                        for  (i = start; i < msg_count; i++) {
                                app_deliver_fn(nodeid, iov_delv.iov_base, iov_delv.iov_len,
                                        endian_conversion_required);
                                assembly->index += msg_lens[i];
                                iov_delv.iov_base = (void *)&assembly->data[assembly->index];
                                if (i < (msg_count - 1)) {
                                        iov_delv.iov_len = msg_lens[i + 1];
                                }
                        }
                } else {
                        log_printf (LOG_DEBUG, "fragmented continuation %u is not equal to assembly last_frag_num %u",
                                        continuation, assembly->last_frag_num);
                        assembly->throw_away_mode = THROW_AWAY_ACTIVE;
                }
        }

        if (mcast->fragmented == 0) {
                /*
                 * End of messages, dereference assembly struct
                 */
                assembly->last_frag_num = 0;
                assembly->index = 0;
                assembly_deref (assembly);
        } else {
                /*
                 * Message is fragmented, keep around assembly list
                 */
                if (mcast->msg_count > 1) {
                        memmove (&assembly->data[0],
                                &assembly->data[assembly->index],
                                msg_lens[msg_count]);

                        assembly->index = 0;
                }
                assembly->index += msg_lens[msg_count];
        }
}

/*
 * Totem Process Group Abstraction
 * depends on poll abstraction, POSIX, IPV4
 */

void *callback_token_received_handle;

int callback_token_received_fn (enum totem_callback_token_type type,
                                const void *data)
{
        struct totempg_mcast mcast;
        struct iovec iovecs[3];

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&mcast_msg_mutex);
        }
        if (mcast_packed_msg_count == 0) {
                if (totempg_threaded_mode == 1) {
                        pthread_mutex_unlock (&mcast_msg_mutex);
                }
                return (0);
        }
        if (totemsrp_avail(totemsrp_context) == 0) {
                if (totempg_threaded_mode == 1) {
                        pthread_mutex_unlock (&mcast_msg_mutex);
                }
                return (0);
        }
        mcast.header.version = 0;
        mcast.header.type = 0;
        mcast.fragmented = 0;

        /*
         * Was the first message in this buffer a continuation of a
         * fragmented message?
         */
        mcast.continuation = fragment_continuation;
        fragment_continuation = 0;

        mcast.msg_count = mcast_packed_msg_count;

        iovecs[0].iov_base = (void *)&mcast;
        iovecs[0].iov_len = sizeof (struct totempg_mcast);
        iovecs[1].iov_base = (void *)mcast_packed_msg_lens;
        iovecs[1].iov_len = mcast_packed_msg_count * sizeof (unsigned short);
        iovecs[2].iov_base = (void *)&fragmentation_data[0];
        iovecs[2].iov_len = fragment_size;
        (void)totemsrp_mcast (totemsrp_context, iovecs, 3, 0);

        mcast_packed_msg_count = 0;
        fragment_size = 0;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&mcast_msg_mutex);
        }
        return (0);
}

/*
 * Initialize the totem process group abstraction
 */
int totempg_initialize (
        qb_loop_t *poll_handle,
        struct totem_config *totem_config)
{
        int res;

        totempg_totem_config = totem_config;
        totempg_log_level_security = totem_config->totem_logging_configuration.log_level_security;
        totempg_log_level_error = totem_config->totem_logging_configuration.log_level_error;
        totempg_log_level_warning = totem_config->totem_logging_configuration.log_level_warning;
        totempg_log_level_notice = totem_config->totem_logging_configuration.log_level_notice;
        totempg_log_level_debug = totem_config->totem_logging_configuration.log_level_debug;
        totempg_log_printf = totem_config->totem_logging_configuration.log_printf;
        totempg_subsys_id = totem_config->totem_logging_configuration.log_subsys_id;

        fragmentation_data = malloc (TOTEMPG_PACKET_SIZE);
        if (fragmentation_data == 0) {
                return (-1);
        }

        totemsrp_net_mtu_adjust (totem_config);

        res = totemsrp_initialize (
                poll_handle,
                &totemsrp_context,
                totem_config,
                &totempg_stats,
                totempg_deliver_fn,
                totempg_confchg_fn,
                totempg_waiting_trans_ack_cb);

        if (res == -1) {
                goto error_exit;
        }

        totemsrp_callback_token_create (
                totemsrp_context,
                &callback_token_received_handle,
                TOTEM_CALLBACK_TOKEN_RECEIVED,
                0,
                callback_token_received_fn,
                0);

        totempg_size_limit = (totemsrp_avail(totemsrp_context) - 1) *
                (totempg_totem_config->net_mtu -
                sizeof (struct totempg_mcast) - 16);

        qb_list_init (&totempg_groups_list);

error_exit:
        return (res);
}

void totempg_finalize (void)
{
        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
        }
        totemsrp_finalize (totemsrp_context);
        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
}

/*
 * Multicast a message
 */
static int mcast_msg (
        struct iovec *iovec_in,
        unsigned int iov_len,
        int guarantee)
{
        int res = 0;
        struct totempg_mcast mcast;
        struct iovec iovecs[3];
        struct iovec iovec[64];
        int i;
        int dest, src;
        int max_packet_size = 0;
        int copy_len = 0;
        int copy_base = 0;
        int total_size = 0;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&mcast_msg_mutex);
        }
        totemsrp_event_signal (totemsrp_context, TOTEM_EVENT_NEW_MSG, 1);

        /*
         * Remove zero length iovectors from the list
         */
        assert (iov_len < 64);
        for (dest = 0, src = 0; src < iov_len; src++) {
                if (iovec_in[src].iov_len) {
                        memcpy (&iovec[dest++], &iovec_in[src],
                                sizeof (struct iovec));
                }
        }
        iov_len = dest;

        max_packet_size = TOTEMPG_PACKET_SIZE -
                (sizeof (unsigned short) * (mcast_packed_msg_count + 1));

        mcast_packed_msg_lens[mcast_packed_msg_count] = 0;

        /*
         * Check if we would overwrite new message queue
         */
        for (i = 0; i < iov_len; i++) {
                total_size += iovec[i].iov_len;
        }

        if (byte_count_send_ok (total_size + sizeof(unsigned short) *
                (mcast_packed_msg_count)) == 0) {

                if (totempg_threaded_mode == 1) {
                        pthread_mutex_unlock (&mcast_msg_mutex);
                }
                return(-1);
        }

        memset(&mcast, 0, sizeof(mcast));

        mcast.header.version = 0;
        for (i = 0; i < iov_len; ) {
                mcast.fragmented = 0;
                mcast.continuation = fragment_continuation;
                copy_len = iovec[i].iov_len - copy_base;

                /*
                 * If it all fits with room left over, copy it in.
                 * We need to leave at least sizeof(short) + 1 bytes in the
                 * fragment_buffer on exit so that max_packet_size + fragment_size
                 * doesn't exceed the size of the fragment_buffer on the next call.
                 */
                if ((iovec[i].iov_len + fragment_size) <
                        (max_packet_size - sizeof (unsigned short))) {

                        memcpy (&fragmentation_data[fragment_size],
                                (char *)iovec[i].iov_base + copy_base, copy_len);
                        fragment_size += copy_len;
                        mcast_packed_msg_lens[mcast_packed_msg_count] += copy_len;
                        next_fragment = 1;
                        copy_len = 0;
                        copy_base = 0;
                        i++;
                        continue;

                /*
                 * If it just fits or is too big, then send out what fits.
                 */
                } else {
                        unsigned char *data_ptr;

                        copy_len = min(copy_len, max_packet_size - fragment_size);
                        if( copy_len == max_packet_size )
                                data_ptr = (unsigned char *)iovec[i].iov_base + copy_base;
                        else {
                                data_ptr = fragmentation_data;
                        }

                        memcpy (&fragmentation_data[fragment_size],
                                (unsigned char *)iovec[i].iov_base + copy_base, copy_len);
                        mcast_packed_msg_lens[mcast_packed_msg_count] += copy_len;

                        /*
                         * if we're not on the last iovec or the iovec is too large to
                         * fit, then indicate a fragment. This also means that the next
                         * message will have the continuation of this one.
                         */
                        if ((i < (iov_len - 1)) ||
                                        ((copy_base + copy_len) < iovec[i].iov_len)) {
                                if (!next_fragment) {
                                        next_fragment++;
                                }
                                fragment_continuation = next_fragment;
                                mcast.fragmented = next_fragment++;
                                assert(fragment_continuation != 0);
                                assert(mcast.fragmented != 0);
                        } else {
                                fragment_continuation = 0;
                        }

                        /*
                         * assemble the message and send it
                         */
                        mcast.msg_count = ++mcast_packed_msg_count;
                        iovecs[0].iov_base = (void *)&mcast;
                        iovecs[0].iov_len = sizeof(struct totempg_mcast);
                        iovecs[1].iov_base = (void *)mcast_packed_msg_lens;
                        iovecs[1].iov_len = mcast_packed_msg_count *
                                sizeof(unsigned short);
                        iovecs[2].iov_base = (void *)data_ptr;
                        iovecs[2].iov_len = fragment_size + copy_len;
                        assert (totemsrp_avail(totemsrp_context) > 0);
                        res = totemsrp_mcast (totemsrp_context, iovecs, 3, guarantee);
                        if (res == -1) {
                                goto error_exit;
                        }

                        /*
                         * Recalculate counts and indexes for the next.
                         */
                        mcast_packed_msg_lens[0] = 0;
                        mcast_packed_msg_count = 0;
                        fragment_size = 0;
                        max_packet_size = TOTEMPG_PACKET_SIZE - (sizeof(unsigned short));

                        /*
                         * If the iovec all fit, go to the next iovec
                         */
                        if ((copy_base + copy_len) == iovec[i].iov_len) {
                                copy_len = 0;
                                copy_base = 0;
                                i++;

                        /*
                         * Continue with the rest of the current iovec.
                         */
                        } else {
                                copy_base += copy_len;
                        }
                }
        }

        /*
         * Bump only if we added message data.  This may be zero if
         * the last buffer just fit into the fragmentation_data buffer
         * and we were at the last iovec.
         */
        if (mcast_packed_msg_lens[mcast_packed_msg_count]) {
                        mcast_packed_msg_count++;
        }

error_exit:
        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&mcast_msg_mutex);
        }
        return (res);
}

/*
 * Determine if a message of msg_size could be queued
 */
static int msg_count_send_ok (
        int msg_count)
{
        int avail = 0;

        avail = totemsrp_avail (totemsrp_context);
        totempg_stats.msg_queue_avail = avail;

        return ((avail - totempg_reserved) > msg_count);
}

static int byte_count_send_ok (
        int byte_count)
{
        unsigned int msg_count = 0;
        int avail = 0;

        avail = totemsrp_avail (totemsrp_context);

        msg_count = (byte_count / (totempg_totem_config->net_mtu - sizeof (struct totempg_mcast) - 16)) + 1;

        return (avail >= msg_count);
}

static int send_reserve (
        int msg_size)
{
        unsigned int msg_count = 0;

        msg_count = (msg_size / (totempg_totem_config->net_mtu - sizeof (struct totempg_mcast) - 16)) + 1;
        totempg_reserved += msg_count;
        totempg_stats.msg_reserved = totempg_reserved;

        return (msg_count);
}

static void send_release (
        int msg_count)
{
        totempg_reserved -= msg_count;
        totempg_stats.msg_reserved = totempg_reserved;
}

#ifndef HAVE_SMALL_MEMORY_FOOTPRINT
#undef MESSAGE_QUEUE_MAX
#define MESSAGE_QUEUE_MAX       ((4 * MESSAGE_SIZE_MAX) / totempg_totem_config->net_mtu)
#endif /* HAVE_SMALL_MEMORY_FOOTPRINT */

static uint32_t q_level_precent_used(void)
{
        return (100 - (((totemsrp_avail(totemsrp_context) - totempg_reserved) * 100) / MESSAGE_QUEUE_MAX));
}

int totempg_callback_token_create (
        void **handle_out,
        enum totem_callback_token_type type,
        int delete,
        int (*callback_fn) (enum totem_callback_token_type type, const void *),
        const void *data)
{
        unsigned int res;
        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&callback_token_mutex);
        }
        res = totemsrp_callback_token_create (totemsrp_context, handle_out, type, delete,
                callback_fn, data);
        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&callback_token_mutex);
        }
        return (res);
}

void totempg_callback_token_destroy (
        void *handle_out)
{
        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&callback_token_mutex);
        }
        totemsrp_callback_token_destroy (totemsrp_context, handle_out);
        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&callback_token_mutex);
        }
}

/*
 *      vi: set autoindent tabstop=4 shiftwidth=4 :
 */

int totempg_groups_initialize (
        void **totempg_groups_instance,

        void (*deliver_fn) (
                unsigned int nodeid,
                const void *msg,
                unsigned int msg_len,
                int endian_conversion_required),

        void (*confchg_fn) (
                enum totem_configuration_type configuration_type,
                const unsigned int *member_list, size_t member_list_entries,
                const unsigned int *left_list, size_t left_list_entries,
                const unsigned int *joined_list, size_t joined_list_entries,
                const struct memb_ring_id *ring_id))
{
        struct totempg_group_instance *instance;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
        }
        
        instance = malloc (sizeof (struct totempg_group_instance));
        if (instance == NULL) {
                goto error_exit;
        }

        instance->deliver_fn = deliver_fn;
        instance->confchg_fn = confchg_fn;
        instance->groups = 0;
        instance->groups_cnt = 0;
        instance->q_level = QB_LOOP_MED;
        qb_list_init (&instance->list);
        qb_list_add (&instance->list, &totempg_groups_list);

        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
        *totempg_groups_instance = instance;
        return (0);

error_exit:
        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
        return (-1);
}

int totempg_groups_join (
        void *totempg_groups_instance,
        const struct totempg_group *groups,
        size_t group_cnt)
{
        struct totempg_group_instance *instance = (struct totempg_group_instance *)totempg_groups_instance;
        struct totempg_group *new_groups;
        int res = 0;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
        }
        
        new_groups = realloc (instance->groups,
                sizeof (struct totempg_group) *
                (instance->groups_cnt + group_cnt));
        if (new_groups == 0) {
                res = -1;
                goto error_exit;
        }
        memcpy (&new_groups[instance->groups_cnt],
                groups, group_cnt * sizeof (struct totempg_group));
        instance->groups = new_groups;
        instance->groups_cnt += group_cnt;

error_exit:
        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
        return (res);
}

int totempg_groups_leave (
        void *totempg_groups_instance,
        const struct totempg_group *groups,
        size_t group_cnt)
{
        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
        }

        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
        return (0);
}

#define MAX_IOVECS_FROM_APP 32
#define MAX_GROUPS_PER_MSG 32

int totempg_groups_mcast_joined (
        void *totempg_groups_instance,
        const struct iovec *iovec,
        unsigned int iov_len,
        int guarantee)
{
        struct totempg_group_instance *instance = (struct totempg_group_instance *)totempg_groups_instance;
        unsigned short group_len[MAX_GROUPS_PER_MSG + 1];
        struct iovec iovec_mcast[MAX_GROUPS_PER_MSG + 1 + MAX_IOVECS_FROM_APP];
        int i;
        unsigned int res;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
        }
        
        /*
         * Build group_len structure and the iovec_mcast structure
         */
        group_len[0] = instance->groups_cnt;
        for (i = 0; i < instance->groups_cnt; i++) {
                group_len[i + 1] = instance->groups[i].group_len;
                iovec_mcast[i + 1].iov_len = instance->groups[i].group_len;
                iovec_mcast[i + 1].iov_base = (void *) instance->groups[i].group;
        }
        iovec_mcast[0].iov_len = (instance->groups_cnt + 1) * sizeof (unsigned short);
        iovec_mcast[0].iov_base = group_len;
        for (i = 0; i < iov_len; i++) {
                iovec_mcast[i + instance->groups_cnt + 1].iov_len = iovec[i].iov_len;
                iovec_mcast[i + instance->groups_cnt + 1].iov_base = iovec[i].iov_base;
        }

        res = mcast_msg (iovec_mcast, iov_len + instance->groups_cnt + 1, guarantee);

        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
        
        return (res);
}

static void check_q_level(
        void *totempg_groups_instance)
{
        struct totempg_group_instance *instance = (struct totempg_group_instance *)totempg_groups_instance;
        int32_t old_level = instance->q_level;
        int32_t percent_used = q_level_precent_used();

        if (percent_used >= 75 && instance->q_level != TOTEM_Q_LEVEL_CRITICAL) {
                instance->q_level = TOTEM_Q_LEVEL_CRITICAL;
        } else if (percent_used < 30 && instance->q_level != TOTEM_Q_LEVEL_LOW) {
                instance->q_level = TOTEM_Q_LEVEL_LOW;
        } else if (percent_used > 40 && percent_used < 50 && instance->q_level != TOTEM_Q_LEVEL_GOOD) {
                instance->q_level = TOTEM_Q_LEVEL_GOOD;
        } else if (percent_used > 60 && percent_used < 70 && instance->q_level != TOTEM_Q_LEVEL_HIGH) {
                instance->q_level = TOTEM_Q_LEVEL_HIGH;
        }
        if (totem_queue_level_changed && old_level != instance->q_level) {
                totem_queue_level_changed(instance->q_level);
        }
}

void totempg_check_q_level(
        void *totempg_groups_instance)
{
        struct totempg_group_instance *instance = (struct totempg_group_instance *)totempg_groups_instance;

        check_q_level(instance);
}

int totempg_groups_joined_reserve (
        void *totempg_groups_instance,
        const struct iovec *iovec,
        unsigned int iov_len)
{
        struct totempg_group_instance *instance = (struct totempg_group_instance *)totempg_groups_instance;
        unsigned int size = 0;
        unsigned int i;
        unsigned int reserved = 0;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
                pthread_mutex_lock (&mcast_msg_mutex);
        }

        for (i = 0; i < instance->groups_cnt; i++) {
                size += instance->groups[i].group_len;
        }
        for (i = 0; i < iov_len; i++) {
                size += iovec[i].iov_len;
        }

        if (size >= totempg_size_limit) {
                reserved = -1;
                goto error_exit;
        }

        if (byte_count_send_ok (size)) {
                reserved = send_reserve (size);
        } else {
                reserved = 0;
        }

error_exit:
        check_q_level(instance);

        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&mcast_msg_mutex);
                pthread_mutex_unlock (&totempg_mutex);
        }
        return (reserved);
}


int totempg_groups_joined_release (int msg_count)
{
        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
                pthread_mutex_lock (&mcast_msg_mutex);
        }
        send_release (msg_count);
        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&mcast_msg_mutex);
                pthread_mutex_unlock (&totempg_mutex);
        }
        return 0;
}

int totempg_groups_mcast_groups (
        void *totempg_groups_instance,
        int guarantee,
        const struct totempg_group *groups,
        size_t groups_cnt,
        const struct iovec *iovec,
        unsigned int iov_len)
{
        unsigned short group_len[MAX_GROUPS_PER_MSG + 1];
        struct iovec iovec_mcast[MAX_GROUPS_PER_MSG + 1 + MAX_IOVECS_FROM_APP];
        int i;
        unsigned int res;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
        }

        /*
         * Build group_len structure and the iovec_mcast structure
         */
        group_len[0] = groups_cnt;
        for (i = 0; i < groups_cnt; i++) {
                group_len[i + 1] = groups[i].group_len;
                iovec_mcast[i + 1].iov_len = groups[i].group_len;
                iovec_mcast[i + 1].iov_base = (void *) groups[i].group;
        }
        iovec_mcast[0].iov_len = (groups_cnt + 1) * sizeof (unsigned short);
        iovec_mcast[0].iov_base = group_len;
        for (i = 0; i < iov_len; i++) {
                iovec_mcast[i + groups_cnt + 1].iov_len = iovec[i].iov_len;
                iovec_mcast[i + groups_cnt + 1].iov_base = iovec[i].iov_base;
        }

        res = mcast_msg (iovec_mcast, iov_len + groups_cnt + 1, guarantee);

        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
        return (res);
}

/*
 * Returns -1 if error, 0 if can't send, 1 if can send the message
 */
int totempg_groups_send_ok_groups (
        void *totempg_groups_instance,
        const struct totempg_group *groups,
        size_t groups_cnt,
        const struct iovec *iovec,
        unsigned int iov_len)
{
        unsigned int size = 0;
        unsigned int i;
        unsigned int res;

        if (totempg_threaded_mode == 1) {
                pthread_mutex_lock (&totempg_mutex);
        }

        for (i = 0; i < groups_cnt; i++) {
                size += groups[i].group_len;
        }
        for (i = 0; i < iov_len; i++) {
                size += iovec[i].iov_len;
        }

        res = msg_count_send_ok (size);

        if (totempg_threaded_mode == 1) {
                pthread_mutex_unlock (&totempg_mutex);
        }
        return (res);
}

int totempg_iface_set (
        struct totem_ip_address *interface_addr,
        unsigned short ip_port,
        unsigned int iface_no)
{
        int res;

        res = totemsrp_iface_set (
                totemsrp_context,
                interface_addr,
                ip_port,
                iface_no);

        return (res);
}

int totempg_nodestatus_get (unsigned int nodeid,
                            struct totem_node_status *node_status)
{
        memset(node_status, 0, sizeof(struct totem_node_status));
        return totemsrp_nodestatus_get (totemsrp_context, nodeid, node_status);
}

int totempg_ifaces_get (
        unsigned int nodeid,
        unsigned int *interface_id,
        struct totem_ip_address *interfaces,
        unsigned int interfaces_size,
        char ***status,
        unsigned int *iface_count)
{
        int res;

        res = totemsrp_ifaces_get (
                totemsrp_context,
                nodeid,
                interface_id,
                interfaces,
                interfaces_size,
                status,
                iface_count);

        return (res);
}

void totempg_event_signal (enum totem_event_type type, int value)
{
        totemsrp_event_signal (totemsrp_context, type, value);
}

void* totempg_get_stats (void)
{
        return &totempg_stats;
}

int totempg_crypto_set (
        const char *cipher_type,
        const char *hash_type)
{
        int res;

        res = totemsrp_crypto_set (totemsrp_context, cipher_type, hash_type);

        return (res);
}

#define ONE_IFACE_LEN 63
const char *totempg_ifaces_print (unsigned int nodeid)
{
        static char iface_string[256 * INTERFACE_MAX];
        char one_iface[ONE_IFACE_LEN+1];
        struct totem_ip_address interfaces[INTERFACE_MAX];
        unsigned int iface_count;
        unsigned int iface_ids[INTERFACE_MAX];
        unsigned int i;
        int res;

        iface_string[0] = '\0';

        res = totempg_ifaces_get (nodeid, iface_ids, interfaces, INTERFACE_MAX, NULL, &iface_count);
        if (res == -1) {
                return ("no interface found for nodeid");
        }

        res = totempg_ifaces_get (nodeid, iface_ids, interfaces, INTERFACE_MAX, NULL, &iface_count);

        for (i = 0; i < iface_count; i++) {
                if (!interfaces[i].family) {
                        continue;
                }
                snprintf (one_iface, ONE_IFACE_LEN,
                          "r(%d) ip(%s) ",
                          i, totemip_print (&interfaces[i]));
                strcat (iface_string, one_iface);
        }
        return (iface_string);
}

unsigned int totempg_my_nodeid_get (void)
{
        return (totemsrp_my_nodeid_get(totemsrp_context));
}

int totempg_my_family_get (void)
{
        return (totemsrp_my_family_get(totemsrp_context));
}
extern void totempg_service_ready_register (
        void (*totem_service_ready) (void))
{
        totemsrp_service_ready_register (totemsrp_context, totem_service_ready);
}

void totempg_queue_level_register_callback (totem_queue_level_changed_fn fn)
{
        totem_queue_level_changed = fn;
}

extern int totempg_member_add (
        const struct totem_ip_address *member,
        int ring_no)
{
        return totemsrp_member_add (totemsrp_context, member, ring_no);
}

extern int totempg_member_remove (
        const struct totem_ip_address *member,
        int ring_no)
{
        return totemsrp_member_remove (totemsrp_context, member, ring_no);
}

extern int totempg_reconfigure (void)
{
        return totemsrp_reconfigure (totemsrp_context, totempg_totem_config);
}

extern int totempg_crypto_reconfigure_phase (cfg_message_crypto_reconfig_phase_t phase)
{
        return totemsrp_crypto_reconfigure_phase (totemsrp_context, totempg_totem_config, phase);
}

extern void totempg_stats_clear (int flags)
{
        if (flags & TOTEMPG_STATS_CLEAR_TOTEM) {
                totempg_stats.msg_reserved = 0;
                totempg_stats.msg_queue_avail = 0;
        }
        return totemsrp_stats_clear (totemsrp_context, flags);
}

void totempg_threaded_mode_enable (void)
{
        totempg_threaded_mode = 1;
        totemsrp_threaded_mode_enable (totemsrp_context);
}

void totempg_trans_ack (void)
{
        totemsrp_trans_ack (totemsrp_context);
}

void totempg_force_gather (void)
{
        totemsrp_force_gather(totemsrp_context);
}

/* Assumes ->orig_interfaces is already allocated */
void totempg_get_config(struct totem_config *config)
{
        struct totem_interface *temp_if = config->orig_interfaces;

        memcpy(config, totempg_totem_config, sizeof(struct totem_config));
        config->orig_interfaces = temp_if;
        memcpy(config->orig_interfaces, totempg_totem_config->interfaces, sizeof(struct totem_interface) * INTERFACE_MAX);
        config->interfaces = NULL;
}

void totempg_put_config(struct totem_config *config)
{
        struct totem_interface *temp_if = totempg_totem_config->interfaces;

        /* Preseve the existing interfaces[] array as transports might have pointers saved */
        memcpy(totempg_totem_config->interfaces, config->interfaces, sizeof(struct totem_interface) * INTERFACE_MAX);
        memcpy(totempg_totem_config, config, sizeof(struct totem_config));
        totempg_totem_config->interfaces = temp_if;
}