/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2013-2015 Mellanox Technologies, Inc.
 *                         All rights reserved.
 * Copyright (c) 2015      Los Alamos National Security, LLC. All rights
 *                         reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */
#define _GNU_SOURCE
#include <stdio.h>

#include <sys/types.h>
#include <unistd.h>

#include "oshmem_config.h"
#include "orte/util/show_help.h"
#include "shmem.h"
#include "oshmem/runtime/params.h"
#include "oshmem/mca/spml/spml.h"
#include "oshmem/mca/spml/base/base.h"
#include "spml_ikrit_component.h"
#include "oshmem/mca/spml/ikrit/spml_ikrit.h"

#include "orte/util/show_help.h"

static int mca_spml_ikrit_component_register(void);
static int mca_spml_ikrit_component_open(void);
static int mca_spml_ikrit_component_close(void);
static mca_spml_base_module_t*
mca_spml_ikrit_component_init(int* priority,
                              bool enable_progress_threads,
                              bool enable_mpi_threads);
static int mca_spml_ikrit_component_fini(void);
mca_spml_base_component_2_0_0_t mca_spml_ikrit_component = {

    /* First, the mca_base_component_t struct containing meta
       information about the component itself */

    .spmlm_version = {
        MCA_SPML_BASE_VERSION_2_0_0,

        .mca_component_name = "ikrit",
        MCA_BASE_MAKE_VERSION(component, OSHMEM_MAJOR_VERSION, OSHMEM_MINOR_VERSION,
                              OSHMEM_RELEASE_VERSION),
        .mca_open_component = mca_spml_ikrit_component_open,
        .mca_close_component = mca_spml_ikrit_component_close,
        .mca_register_component_params = mca_spml_ikrit_component_register,
    },
    .spmlm_data = {
        /* The component is checkpoint ready */
        MCA_BASE_METADATA_PARAM_CHECKPOINT
    },

    .spmlm_init = mca_spml_ikrit_component_init,
    .spmlm_finalize = mca_spml_ikrit_component_fini,
};

#if MXM_API >= MXM_VERSION(2,1)
static inline int check_mxm_tls(char *var)
{
    char *str;

    str = getenv(var);
    if (NULL == str) {
        return OSHMEM_SUCCESS;
    }

    if (NULL != strstr(str, "shm")) {
        if (0 < asprintf(&str,
                    "%s=%s",
                    var, getenv(var)
                    )) {
            orte_show_help("help-oshmem-spml-ikrit.txt", "mxm shm tls", true,
                    str);
            free(str);
        }
        return OSHMEM_ERROR;
    }
    if (NULL == strstr(str, "rc") && NULL == strstr(str, "dc")) {
        mca_spml_ikrit.ud_only = 1;
    } else {
        mca_spml_ikrit.ud_only = 0;
    }
    return OSHMEM_SUCCESS;
}

static inline int set_mxm_tls(void)
{
    char *tls;

    /*
     * Set DC defaults optimized for shmem
     */
    opal_setenv("MXM_OSHMEM_DC_QP_LIMIT",      "2", 0, &environ);
    opal_setenv("MXM_OSHMEM_DC_RNDV_QP_LIMIT", "2", 0, &environ);
    opal_setenv("MXM_OSHMEM_DC_MSS",          "8196", 0, &environ);

    tls = getenv("MXM_OSHMEM_TLS");
    if (NULL != tls) {
        return check_mxm_tls("MXM_OSHMEM_TLS");
    }

    tls = getenv("MXM_TLS");
    if (NULL == tls) {
        opal_setenv("MXM_OSHMEM_TLS", mca_spml_ikrit.mxm_tls, 1, &environ);
        return check_mxm_tls("MXM_OSHMEM_TLS");
    }
    if (OSHMEM_SUCCESS == check_mxm_tls("MXM_TLS")) {
        opal_setenv("MXM_OSHMEM_TLS", tls, 1, &environ);
        return OSHMEM_SUCCESS;
    }
    return OSHMEM_ERROR;
}

static inline int check_mxm_hw_tls(char *v, char *tls)
{
	if (v && tls) {
        if ((0 == strcmp(tls, "rc") || 0 == strcmp(tls, "dc"))) {
            mca_spml_ikrit.ud_only = 0;
            return OSHMEM_SUCCESS;
        }

        if (strstr(tls, "ud") &&
            (NULL == strstr(tls, "rc") && NULL == strstr(tls, "dc") &&
             NULL == strstr(tls, "shm"))) {
            return OSHMEM_SUCCESS;
        }
	}

    orte_show_help("help-oshmem-spml-ikrit.txt", "mxm tls", true,
                    v, tls);
    return OSHMEM_ERROR;
}

static inline int set_mxm_hw_rdma_tls(void)
{
    if (!mca_spml_ikrit.hw_rdma_channel) {
        return check_mxm_hw_tls("MXM_OSHMEM_TLS", getenv("MXM_OSHMEM_TLS"));
    }
    opal_setenv("MXM_OSHMEM_HW_RDMA_RC_QP_LIMIT", "-1", 0, &environ);
    opal_setenv("MXM_OSHMEM_HW_RDMA_TLS", "rc", 0, &environ);
    SPML_VERBOSE(5, "Additional communication channel is enabled. Transports are: %s",
                 getenv("MXM_OSHMEM_HW_RDMA_TLS"));

    return check_mxm_hw_tls("MXM_OSHMEM_HW_RDMA_TLS",
            getenv("MXM_OSHMEM_HW_RDMA_TLS"));
}

#endif

static inline void mca_spml_ikrit_param_register_int(const char* param_name,
                                                    int default_value,
                                                    const char *help_msg,
                                                    int *storage)
{
    *storage = default_value;
    (void) mca_base_component_var_register(&mca_spml_ikrit_component.spmlm_version,
                                           param_name,
                                           help_msg,
                                           MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
                                           OPAL_INFO_LVL_9,
                                           MCA_BASE_VAR_SCOPE_READONLY,
                                           storage);
}

static inline void mca_spml_ikrit_param_register_size_t(const char* param_name,
                                                        size_t default_value,
                                                        const char *help_msg,
                                                        size_t *storage)
{
    *storage = default_value;
    (void) mca_base_component_var_register(&mca_spml_ikrit_component.spmlm_version,
                                           param_name,
                                           help_msg,
                                           MCA_BASE_VAR_TYPE_SIZE_T, NULL, 0, 0,
                                           OPAL_INFO_LVL_9,
                                           MCA_BASE_VAR_SCOPE_READONLY,
                                           storage);
}

static inline void  mca_spml_ikrit_param_register_string(const char* param_name,
                                                    char* default_value,
                                                    const char *help_msg,
                                                    char **storage)
{
    *storage = default_value;
    (void) mca_base_component_var_register(&mca_spml_ikrit_component.spmlm_version,
                                           param_name,
                                           help_msg,
                                           MCA_BASE_VAR_TYPE_STRING, NULL, 0, 0,
                                           OPAL_INFO_LVL_9,
                                           MCA_BASE_VAR_SCOPE_READONLY,
                                           storage);
}

static int mca_spml_ikrit_component_register(void)
{
    char *v;

    mca_spml_ikrit_param_register_int("free_list_num", 1024,
                                      0,
                                      &mca_spml_ikrit.free_list_num);
    mca_spml_ikrit_param_register_int("free_list_max", 1024,
                                      0,
                                      &mca_spml_ikrit.free_list_max);
    mca_spml_ikrit_param_register_int("free_list_inc", 16,
                                      0,
                                      &mca_spml_ikrit.free_list_inc);
    mca_spml_ikrit_param_register_int("bulk_connect", 1,
                                      0,
                                      &mca_spml_ikrit.bulk_connect);
    mca_spml_ikrit_param_register_int("bulk_disconnect", 1,
                                      0,
                                      &mca_spml_ikrit.bulk_disconnect);
    mca_spml_ikrit_param_register_int("priority", 20,
                                      "[integer] ikrit priority",
                                      &mca_spml_ikrit.priority);
    mca_spml_ikrit_param_register_int("hw_rdma_channel", 0,
                                       "create separate reliable connection channel",
                                       &mca_spml_ikrit.hw_rdma_channel);

    if (!mca_spml_ikrit.hw_rdma_channel)
        v = "ud,self";
    else
        v = "rc,ud,self";
    mca_spml_ikrit_param_register_string("mxm_tls",
                                         v,
                                         "[string] TL channels for MXM",
                                         &mca_spml_ikrit.mxm_tls);

     mca_spml_ikrit_param_register_int("np",
                                       0,
                                       "[integer] Minimal allowed job's NP to activate ikrit", &mca_spml_ikrit.np);
    mca_spml_ikrit_param_register_int("unsync_conn_max", 8,
                                      "[integer] Max number of connections that do not require notification of PUT operation remote completion. Increasing this number improves efficiency of p2p communication but increases overhead of shmem_fence/shmem_quiet/shmem_barrier",
                                      &mca_spml_ikrit.unsync_conn_max);

    mca_spml_ikrit_param_register_size_t("put_zcopy_threshold", 16384ULL,
                                         "[size_t] Use zero copy put if message size is greater than the threshold",
                                      &mca_spml_ikrit.put_zcopy_threshold);
    if (oshmem_num_procs() < mca_spml_ikrit.np) {
        SPML_VERBOSE(1,
                     "Not enough ranks (%d<%d), disqualifying spml/ikrit",
                     oshmem_num_procs(), mca_spml_ikrit.np);
        return OSHMEM_ERR_NOT_AVAILABLE;
    }

    return OSHMEM_SUCCESS;
}

int spml_ikrit_progress(void)
{
    mxm_error_t err;

    err = mxm_progress(mca_spml_ikrit.mxm_context);
    if ((MXM_OK != err) && (MXM_ERR_NO_PROGRESS != err)) {
        orte_show_help("help-oshmem-spml-ikrit.txt",
                       "errors during mxm_progress",
                       true,
                       mxm_error_string(err));
    }
    return 1;
}

static int mca_spml_ikrit_component_open(void)
{
    mxm_error_t err;
    unsigned long cur_ver;

    cur_ver = mxm_get_version();
    if (cur_ver != MXM_API) {
            SPML_WARNING(
                    "OSHMEM was compiled with MXM version %d.%d but version %ld.%ld detected.",
                    MXM_VERNO_MAJOR, MXM_VERNO_MINOR,
                    (cur_ver >> MXM_MAJOR_BIT) & 0xff,
                    (cur_ver >> MXM_MINOR_BIT) & 0xff);
    }

    mca_spml_ikrit.mxm_mq = NULL;
    mca_spml_ikrit.mxm_context = NULL;
    mca_spml_ikrit.ud_only = 0;
#if MXM_API < MXM_VERSION(2,1)
    mca_spml_ikrit.hw_rdma_channel = 0;
    if ((MXM_OK != mxm_config_read_context_opts(&mca_spml_ikrit.mxm_ctx_opts)) ||
        (MXM_OK != mxm_config_read_ep_opts(&mca_spml_ikrit.mxm_ep_opts)))
#else
    if (OSHMEM_SUCCESS != set_mxm_tls()) {
        return OSHMEM_ERROR;
    }
    if (OSHMEM_SUCCESS != set_mxm_hw_rdma_tls()) {
        return OSHMEM_ERROR;
    }
    if ((mca_spml_ikrit.hw_rdma_channel && MXM_OK != mxm_config_read_opts(&mca_spml_ikrit.mxm_ctx_opts,
                &mca_spml_ikrit.mxm_ep_hw_rdma_opts,
                "OSHMEM_HW_RDMA", NULL, 0)) ||
            MXM_OK != mxm_config_read_opts(&mca_spml_ikrit.mxm_ctx_opts,
                &mca_spml_ikrit.mxm_ep_opts,
                "OSHMEM", NULL, 0))
#endif
    {
        SPML_ERROR("Failed to parse MXM configuration");
        return OSHMEM_ERROR;
    }

    SPML_VERBOSE(5, "UD only mode is %s",
                 mca_spml_ikrit.ud_only ? "enabled" : "disabled");

    err = mxm_init(mca_spml_ikrit.mxm_ctx_opts, &mca_spml_ikrit.mxm_context);
    if (MXM_OK != err) {
        if (MXM_ERR_NO_DEVICE == err) {
            SPML_VERBOSE(1,
                         "No supported device found, disqualifying spml/ikrit");
        } else {
            orte_show_help("help-oshmem-spml-ikrit.txt",
                           "mxm init",
                           true,
                           mxm_error_string(err));
        }
        return OSHMEM_ERR_NOT_AVAILABLE;
    }

    err = mxm_mq_create(mca_spml_ikrit.mxm_context,
                        MXM_SHMEM_MQ_ID,
                        &mca_spml_ikrit.mxm_mq);
    if (MXM_OK != err) {
        orte_show_help("help-oshmem-spml-ikrit.txt",
                       "mxm mq create",
                       true,
                       mxm_error_string(err));
        return OSHMEM_ERROR;
    }

    return OSHMEM_SUCCESS;
}

static int mca_spml_ikrit_component_close(void)
{
    if (mca_spml_ikrit.mxm_mq) {
        mxm_mq_destroy(mca_spml_ikrit.mxm_mq);
    }
    if (mca_spml_ikrit.mxm_context) {
        mxm_cleanup(mca_spml_ikrit.mxm_context);
        mxm_config_free_ep_opts(mca_spml_ikrit.mxm_ep_opts);
        mxm_config_free_context_opts(mca_spml_ikrit.mxm_ctx_opts);
        if (mca_spml_ikrit.hw_rdma_channel)
            mxm_config_free_ep_opts(mca_spml_ikrit.mxm_ep_hw_rdma_opts);
    }
    mca_spml_ikrit.mxm_mq = NULL;
    mca_spml_ikrit.mxm_context = NULL;
    return OSHMEM_SUCCESS;
}

static int spml_ikrit_mxm_init(void)
{
    mxm_error_t err;

    /* Open MXM endpoint */
    err = mxm_ep_create(mca_spml_ikrit.mxm_context,
                        mca_spml_ikrit.mxm_ep_opts,
                        &mca_spml_ikrit.mxm_ep);
    if (MXM_OK != err) {
        orte_show_help("help-oshmem-spml-ikrit.txt",
                       "unable to create endpoint",
                       true,
                       mxm_error_string(err));
        return OSHMEM_ERROR;
    }
    if (mca_spml_ikrit.hw_rdma_channel) {
        err = mxm_ep_create(mca_spml_ikrit.mxm_context,
                mca_spml_ikrit.mxm_ep_hw_rdma_opts,
                &mca_spml_ikrit.mxm_hw_rdma_ep);
        if (MXM_OK != err) {
            orte_show_help("help-oshmem-spml-ikrit.txt",
                    "unable to create endpoint",
                    true,
                    mxm_error_string(err));
            return OSHMEM_ERROR;
        }
    } else {
        mca_spml_ikrit.mxm_hw_rdma_ep = mca_spml_ikrit.mxm_ep;
    }

    oshmem_ctx_default = (shmem_ctx_t) &mca_spml_ikrit_ctx_default;

    return OSHMEM_SUCCESS;
}

static mca_spml_base_module_t*
mca_spml_ikrit_component_init(int* priority,
                              bool enable_progress_threads,
                              bool enable_mpi_threads)
{
    SPML_VERBOSE( 10, "in ikrit, my priority is %d\n", mca_spml_ikrit.priority);

    if ((*priority) > mca_spml_ikrit.priority) {
        *priority = mca_spml_ikrit.priority;
        return NULL ;
    }
    *priority = mca_spml_ikrit.priority;

    if (OSHMEM_SUCCESS != spml_ikrit_mxm_init())
        return NULL ;

    mca_spml_ikrit.n_active_puts = 0;
    mca_spml_ikrit.n_active_gets = 0;
    mca_spml_ikrit.n_mxm_fences = 0;
    SPML_VERBOSE(50, "*** ikrit initialized ****");
    return &mca_spml_ikrit.super;
}

static int mca_spml_ikrit_component_fini(void)
{
    opal_progress_unregister(spml_ikrit_progress);
    if (NULL != mca_spml_ikrit.mxm_ep) {
        mxm_ep_destroy(mca_spml_ikrit.mxm_ep);
    }
    if (mca_spml_ikrit.hw_rdma_channel) {
        mxm_ep_destroy(mca_spml_ikrit.mxm_hw_rdma_ep);
    }

    if(!mca_spml_ikrit.enabled)
        return OSHMEM_SUCCESS; /* never selected.. return success.. */
    mca_spml_ikrit.enabled = false;  /* not anymore */

    return OSHMEM_SUCCESS;
}