/*
 * Copyright (c) 2014, 2015, 2016, 2017 Nicira, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <config.h>
#include "dpdk.h"

#include <stdio.h>
#include <sys/types.h>
#include <getopt.h>

#include <rte_cpuflags.h>
#include <rte_errno.h>
#include <rte_log.h>
#include <rte_malloc.h>
#include <rte_memzone.h>
#include <rte_version.h>

#include "dirs.h"
#include "fatal-signal.h"
#include "netdev-dpdk.h"
#include "netdev-offload-provider.h"
#include "openvswitch/dynamic-string.h"
#include "openvswitch/vlog.h"
#include "ovs-atomic.h"
#include "ovs-numa.h"
#include "smap.h"
#include "svec.h"
#include "unixctl.h"
#include "util.h"
#include "vswitch-idl.h"

VLOG_DEFINE_THIS_MODULE(dpdk);

static FILE *log_stream = NULL;       /* Stream for DPDK log redirection */

/* Indicates successful initialization of DPDK. */
static atomic_bool dpdk_initialized = false;

static bool
args_contains(const struct svec *args, const char *value)
{
    const char *arg;
    size_t i;

    /* We can't just use 'svec_contains' because args are not sorted. */
    SVEC_FOR_EACH (i, arg, args) {
        if (!strcmp(arg, value)) {
            return true;
        }
    }
    return false;
}

static void
construct_dpdk_options(const struct smap *ovs_other_config, struct svec *args)
{
    struct dpdk_options_map {
        const char *ovs_configuration;
        const char *dpdk_option;
        bool default_enabled;
        const char *default_value;
    } opts[] = {
        {"dpdk-lcore-mask",   "-c",             false, NULL},
        {"dpdk-hugepage-dir", "--huge-dir",     false, NULL},
        {"dpdk-socket-limit", "--socket-limit", false, NULL},
    };

    int i;

    /*First, construct from the flat-options (non-mutex)*/
    for (i = 0; i < ARRAY_SIZE(opts); ++i) {
        const char *value = smap_get(ovs_other_config,
                                     opts[i].ovs_configuration);
        if (!value && opts[i].default_enabled) {
            value = opts[i].default_value;
        }

        if (value) {
            if (!args_contains(args, opts[i].dpdk_option)) {
                svec_add(args, opts[i].dpdk_option);
                svec_add(args, value);
            } else {
                VLOG_WARN("Ignoring database defined option '%s' due to "
                          "dpdk-extra config", opts[i].dpdk_option);
            }
        }
    }
}

#define MAX_DPDK_EXCL_OPTS 10

static void
construct_dpdk_mutex_options(const struct smap *ovs_other_config,
                             struct svec *args)
{
    struct dpdk_exclusive_options_map {
        const char *category;
        const char *ovs_dpdk_options[MAX_DPDK_EXCL_OPTS];
        const char *eal_dpdk_options[MAX_DPDK_EXCL_OPTS];
        const char *default_value;
        int default_option;
    } excl_opts[] = {
        {"memory type",
         {"dpdk-alloc-mem", "dpdk-socket-mem", NULL,},
         {"-m",             "--socket-mem",    NULL,},
         NULL, 0
        },
    };

    int i;
    for (i = 0; i < ARRAY_SIZE(excl_opts); ++i) {
        int found_opts = 0, scan, found_pos = -1;
        const char *found_value;
        struct dpdk_exclusive_options_map *popt = &excl_opts[i];

        for (scan = 0; scan < MAX_DPDK_EXCL_OPTS
                 && popt->ovs_dpdk_options[scan]; ++scan) {
            const char *value = smap_get(ovs_other_config,
                                         popt->ovs_dpdk_options[scan]);
            if (value && strlen(value)) {
                found_opts++;
                found_pos = scan;
                found_value = value;
            }
        }

        if (!found_opts) {
            if (popt->default_option) {
                found_pos = popt->default_option;
                found_value = popt->default_value;
            } else {
                continue;
            }
        }

        if (found_opts > 1) {
            VLOG_ERR("Multiple defined options for %s. Please check your"
                     " database settings and reconfigure if necessary.",
                     popt->category);
        }

        if (!args_contains(args, popt->eal_dpdk_options[found_pos])) {
            svec_add(args, popt->eal_dpdk_options[found_pos]);
            svec_add(args, found_value);
        } else {
            VLOG_WARN("Ignoring database defined option '%s' due to "
                      "dpdk-extra config", popt->eal_dpdk_options[found_pos]);
        }
    }
}

static void
construct_dpdk_args(const struct smap *ovs_other_config, struct svec *args)
{
    const char *extra_configuration = smap_get(ovs_other_config, "dpdk-extra");

    if (extra_configuration) {
        svec_parse_words(args, extra_configuration);
    }

    construct_dpdk_options(ovs_other_config, args);
    construct_dpdk_mutex_options(ovs_other_config, args);
}

static ssize_t
dpdk_log_write(void *c OVS_UNUSED, const char *buf, size_t size)
{
    static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(600, 600);
    static struct vlog_rate_limit dbg_rl = VLOG_RATE_LIMIT_INIT(600, 600);

    switch (rte_log_cur_msg_loglevel()) {
        case RTE_LOG_DEBUG:
            VLOG_DBG_RL(&dbg_rl, "%.*s", (int) size, buf);
            break;
        case RTE_LOG_INFO:
        case RTE_LOG_NOTICE:
            VLOG_INFO_RL(&rl, "%.*s", (int) size, buf);
            break;
        case RTE_LOG_WARNING:
            VLOG_WARN_RL(&rl, "%.*s", (int) size, buf);
            break;
        case RTE_LOG_ERR:
            VLOG_ERR_RL(&rl, "%.*s", (int) size, buf);
            break;
        case RTE_LOG_CRIT:
        case RTE_LOG_ALERT:
        case RTE_LOG_EMERG:
            VLOG_EMER("%.*s", (int) size, buf);
            break;
        default:
            OVS_NOT_REACHED();
    }

    return size;
}

static cookie_io_functions_t dpdk_log_func = {
    .write = dpdk_log_write,
};

static void
dpdk_unixctl_mem_stream(struct unixctl_conn *conn, int argc OVS_UNUSED,
                        const char *argv[] OVS_UNUSED, void *aux)
{
    void (*callback)(FILE *) = aux;
    char *response = NULL;
    FILE *stream;
    size_t size;

    stream = open_memstream(&response, &size);
    if (!stream) {
        response = xasprintf("Unable to open memstream: %s.",
                             ovs_strerror(errno));
        unixctl_command_reply_error(conn, response);
        goto out;
    }

    callback(stream);
    fclose(stream);
    unixctl_command_reply(conn, response);
out:
    free(response);
}

static int
dpdk_parse_log_level(const char *s)
{
    static const char * const levels[] = {
        [RTE_LOG_EMERG]   = "emergency",
        [RTE_LOG_ALERT]   = "alert",
        [RTE_LOG_CRIT]    = "critical",
        [RTE_LOG_ERR]     = "error",
        [RTE_LOG_WARNING] = "warning",
        [RTE_LOG_NOTICE]  = "notice",
        [RTE_LOG_INFO]    = "info",
        [RTE_LOG_DEBUG]   = "debug",
    };
    int i;

    for (i = 1; i < ARRAY_SIZE(levels); ++i) {
        if (!strcmp(s, levels[i])) {
            return i;
        }
    }
    return -1;
}

static void
dpdk_unixctl_log_set(struct unixctl_conn *conn, int argc, const char *argv[],
                     void *aux OVS_UNUSED)
{
    int i;

    /* With no argument, set all components level to 'debug'. */
    if (argc == 1) {
        rte_log_set_level_pattern("*", RTE_LOG_DEBUG);
    }
    for (i = 1; i < argc; i++) {
        char *err_msg = NULL;
        char *level_string;
        char *pattern;
        char *s;
        int level;

        s = xstrdup(argv[i]);
        level_string = strchr(s, ':');
        if (level_string == NULL) {
            pattern = "*";
            level_string = s;
        } else {
            pattern = s;
            level_string[0] = '\0';
            level_string++;
        }

        level = dpdk_parse_log_level(level_string);
        if (level == -1) {
            err_msg = xasprintf("invalid log level: '%s'", level_string);
        } else if (rte_log_set_level_pattern(pattern, level) < 0) {
            err_msg = xasprintf("cannot set log level for '%s'", argv[i]);
        }

        if (err_msg) {
            unixctl_command_reply_error(conn, err_msg);
            free(err_msg);
            free(s);
            return;
        }
        free(s);
    }
    unixctl_command_reply(conn, NULL);
}

static void
malloc_dump_stats_wrapper(FILE *stream)
{
    rte_malloc_dump_stats(stream, NULL);
}

static bool
dpdk_init__(const struct smap *ovs_other_config)
{
    char **argv = NULL;
    int result;
    bool auto_determine = true;
    struct ovs_numa_dump *affinity = NULL;
    struct svec args = SVEC_EMPTY_INITIALIZER;

    log_stream = fopencookie(NULL, "w+", dpdk_log_func);
    if (log_stream == NULL) {
        VLOG_ERR("Can't redirect DPDK log: %s.", ovs_strerror(errno));
    } else {
        setbuf(log_stream, NULL);
        rte_openlog_stream(log_stream);
    }

    svec_add(&args, ovs_get_program_name());
    construct_dpdk_args(ovs_other_config, &args);

#ifdef DPDK_IN_MEMORY_SUPPORTED
    if (!args_contains(&args, "--in-memory") &&
            !args_contains(&args, "--legacy-mem")) {
        svec_add(&args, "--in-memory");
    }
#endif

    if (args_contains(&args, "-c") || args_contains(&args, "-l")) {
        auto_determine = false;
    }

    /**
     * NOTE: This is an unsophisticated mechanism for determining the DPDK
     * main core.
     */
    if (auto_determine) {
        const struct ovs_numa_info_core *core;
        int cpu = 0;

        /* Get the main thread affinity */
        affinity = ovs_numa_thread_getaffinity_dump();
        if (affinity) {
            cpu = INT_MAX;
            FOR_EACH_CORE_ON_DUMP (core, affinity) {
                if (cpu > core->core_id) {
                    cpu = core->core_id;
                }
            }
        } else {
            /* User did not set dpdk-lcore-mask and unable to get current
             * thread affintity - default to core #0 */
            VLOG_ERR("Thread getaffinity failed. Using core #0");
        }
        svec_add(&args, "-l");
        svec_add_nocopy(&args, xasprintf("%d", cpu));
    }

    svec_terminate(&args);

    optind = 1;

    if (VLOG_IS_INFO_ENABLED()) {
        struct ds eal_args = DS_EMPTY_INITIALIZER;
        char *joined_args = svec_join(&args, " ", ".");

        ds_put_format(&eal_args, "EAL ARGS: %s", joined_args);
        VLOG_INFO("%s", ds_cstr_ro(&eal_args));
        ds_destroy(&eal_args);
        free(joined_args);
    }

    /* Copy because 'rte_eal_init' will change the argv, i.e. it will remove
     * some arguments from it. '+1' to copy the terminating NULL.  */
    argv = xmemdup(args.names, (args.n + 1) * sizeof args.names[0]);

    /* Make sure things are initialized ... */
    result = rte_eal_init(args.n, argv);

    free(argv);
    svec_destroy(&args);

    /* Set the main thread affinity back to pre rte_eal_init() value */
    if (affinity) {
        ovs_numa_thread_setaffinity_dump(affinity);
        ovs_numa_dump_destroy(affinity);
    }

    if (result < 0) {
        VLOG_EMER("Unable to initialize DPDK: %s", ovs_strerror(rte_errno));
        return false;
    }

    if (!rte_mp_disable()) {
        VLOG_EMER("Could not disable multiprocess, DPDK won't be available.");
        rte_eal_cleanup();
        return false;
    }

    if (VLOG_IS_DBG_ENABLED()) {
        size_t size;
        char *response = NULL;
        FILE *stream = open_memstream(&response, &size);

        if (stream) {
            fprintf(stream, "rte_memzone_dump:\n");
            rte_memzone_dump(stream);
            fprintf(stream, "rte_log_dump:\n");
            rte_log_dump(stream);
            fclose(stream);
            VLOG_DBG("%s", response);
            free(response);
        } else {
            VLOG_DBG("Could not dump memzone and log levels. "
                     "Unable to open memstream: %s.", ovs_strerror(errno));
        }
    }

    unixctl_command_register("dpdk/lcore-list", "", 0, 0,
                             dpdk_unixctl_mem_stream, rte_lcore_dump);
    unixctl_command_register("dpdk/log-list", "", 0, 0,
                             dpdk_unixctl_mem_stream, rte_log_dump);
    unixctl_command_register("dpdk/log-set", "{level | pattern:level}", 0,
                             INT_MAX, dpdk_unixctl_log_set, NULL);
    unixctl_command_register("dpdk/get-malloc-stats", "", 0, 0,
                             dpdk_unixctl_mem_stream,
                             malloc_dump_stats_wrapper);

    /* We are called from the main thread here */
    RTE_PER_LCORE(_lcore_id) = NON_PMD_CORE_ID;

    /* Finally, register the dpdk classes */
    netdev_dpdk_register(ovs_other_config);
    netdev_register_flow_api_provider(&netdev_offload_dpdk);
    return true;
}

void
dpdk_init(const struct smap *ovs_other_config)
{
    static bool enabled = false;

    if (enabled || !ovs_other_config) {
        return;
    }

    const char *dpdk_init_val = smap_get_def(ovs_other_config, "dpdk-init",
                                             "false");

    bool try_only = !strcasecmp(dpdk_init_val, "try");
    if (!strcasecmp(dpdk_init_val, "true") || try_only) {
        static struct ovsthread_once once_enable = OVSTHREAD_ONCE_INITIALIZER;

        if (ovsthread_once_start(&once_enable)) {
            VLOG_INFO("Using %s", rte_version());
            VLOG_INFO("DPDK Enabled - initializing...");
            enabled = dpdk_init__(ovs_other_config);
            if (enabled) {
                VLOG_INFO("DPDK Enabled - initialized");
            } else if (!try_only) {
                ovs_abort(rte_errno, "Cannot init EAL");
            }
            ovsthread_once_done(&once_enable);
        } else {
            VLOG_ERR_ONCE("DPDK Initialization Failed.");
        }
    } else {
        VLOG_INFO_ONCE("DPDK Disabled - Use other_config:dpdk-init to enable");
    }
    atomic_store_relaxed(&dpdk_initialized, enabled);
}

bool
dpdk_available(void)
{
    bool initialized;

    atomic_read_relaxed(&dpdk_initialized, &initialized);
    return initialized;
}

bool
dpdk_attach_thread(unsigned cpu)
{
    /* NON_PMD_CORE_ID is reserved for use by non pmd threads. */
    ovs_assert(cpu != NON_PMD_CORE_ID);

    if (!dpdk_available()) {
        return false;
    }

    if (rte_thread_register() < 0) {
        VLOG_WARN("DPDK max threads count has been reached. "
                  "PMD thread performance may be impacted.");
        return false;
    }

    VLOG_INFO("PMD thread uses DPDK lcore %u.", rte_lcore_id());
    return true;
}

void
dpdk_detach_thread(void)
{
    unsigned int lcore_id;

    lcore_id = rte_lcore_id();
    rte_thread_unregister();
    VLOG_INFO("PMD thread released DPDK lcore %u.", lcore_id);
}

void
print_dpdk_version(void)
{
    puts(rte_version());
}

void
dpdk_status(const struct ovsrec_open_vswitch *cfg)
{
    if (cfg) {
        ovsrec_open_vswitch_set_dpdk_initialized(cfg, dpdk_available());
        ovsrec_open_vswitch_set_dpdk_version(cfg, rte_version());
    }
}