examples/l3fwd-power/perf_core.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2018 Intel Corporation
 */

#include <stdio.h>
#include <string.h>

#include <rte_common.h>
#include <rte_memory.h>
#include <rte_lcore.h>
#include <rte_power.h>
#include <rte_string_fns.h>

#include "perf_core.h"
#include "main.h"


static uint16_t hp_lcores[RTE_MAX_LCORE];
static uint16_t nb_hp_lcores;

struct perf_lcore_params {
    uint16_t port_id;
    uint8_t queue_id;
    uint8_t high_perf;
    uint8_t lcore_idx;
} __rte_cache_aligned;

static struct perf_lcore_params prf_lc_prms[MAX_LCORE_PARAMS];
static uint16_t nb_prf_lc_prms;

static int
is_hp_core(unsigned int lcore)
{
    struct rte_power_core_capabilities caps;
    int ret;

    /* do we have power management enabled? */
    if (rte_power_get_env() == PM_ENV_NOT_SET) {
        /* there's no power management, so just mark it as high perf */
        return 1;
    }
    ret = rte_power_get_capabilities(lcore, &caps);
    return ret == 0 && caps.turbo;
}

int
update_lcore_params(void)
{
    uint8_t non_perf_lcores[RTE_MAX_LCORE];
    uint16_t nb_non_perf_lcores = 0;
    int i, j;

    /* if perf-config option was not used do nothing */
    if (nb_prf_lc_prms == 0)
        return 0;

    /* if high-perf-cores option was not used query every available core */
    if (nb_hp_lcores == 0) {
        for (i = 0; i < RTE_MAX_LCORE; i++) {
            if (rte_lcore_is_enabled(i) && is_hp_core(i)) {
                hp_lcores[nb_hp_lcores] = i;
                nb_hp_lcores++;
            }
        }
    }

    /* create a list on non high performance cores*/
    for (i = 0; i < RTE_MAX_LCORE; i++) {
        if (rte_lcore_is_enabled(i)) {
            int hp = 0;
            for (j = 0; j < nb_hp_lcores; j++) {
                if (hp_lcores[j] == i) {
                    hp = 1;
                    break;
                }
            }
            if (!hp)
                non_perf_lcores[nb_non_perf_lcores++] = i;
        }
    }

    /* update the lcore config */
    for (i = 0; i < nb_prf_lc_prms; i++) {
        int lcore = -1;
        if (prf_lc_prms[i].high_perf) {
            if (prf_lc_prms[i].lcore_idx < nb_hp_lcores)
                lcore = hp_lcores[prf_lc_prms[i].lcore_idx];
        } else {
            if (prf_lc_prms[i].lcore_idx < nb_non_perf_lcores)
                lcore =
                non_perf_lcores[prf_lc_prms[i].lcore_idx];
        }

        if (lcore < 0) {
            printf("Performance cores configuration error\n");
            return -1;
        }

        lcore_params_array[i].lcore_id = lcore;
        lcore_params_array[i].queue_id = prf_lc_prms[i].queue_id;
        lcore_params_array[i].port_id = prf_lc_prms[i].port_id;
    }

    lcore_params = lcore_params_array;
    nb_lcore_params = nb_prf_lc_prms;

    printf("Updated performance core configuration\n");
    for (i = 0; i < nb_prf_lc_prms; i++)
        printf("\t(%d,%d,%d)\n", lcore_params[i].port_id,
                lcore_params[i].queue_id,
                lcore_params[i].lcore_id);

    return 0;
}

int
parse_perf_config(const char *q_arg)
{
    char s[256];
    const char *p, *p0 = q_arg;
    char *end;
    enum fieldnames {
        FLD_PORT = 0,
        FLD_QUEUE,
        FLD_LCORE_HP,
        FLD_LCORE_IDX,
        _NUM_FLD
    };
    unsigned long int_fld[_NUM_FLD];
    char *str_fld[_NUM_FLD];
    int i;
    unsigned int size;

    nb_prf_lc_prms = 0;

    while ((p = strchr(p0, '(')) != NULL) {
        ++p;
        p0 = strchr(p, ')');
        if (p0 == NULL)
            return -1;

        size = p0 - p;
        if (size >= sizeof(s))
            return -1;

        snprintf(s, sizeof(s), "%.*s", size, p);
        if (rte_strsplit(s, sizeof(s), str_fld, _NUM_FLD, ',') !=
                                _NUM_FLD)
            return -1;
        for (i = 0; i < _NUM_FLD; i++) {
            errno = 0;
            int_fld[i] = strtoul(str_fld[i], &end, 0);
            if (errno != 0 || end == str_fld[i] || int_fld[i] > 255)
                return -1;
        }
        if (nb_prf_lc_prms >= MAX_LCORE_PARAMS) {
            printf("exceeded max number of lcore params: %hu\n",
                    nb_prf_lc_prms);
            return -1;
        }
        prf_lc_prms[nb_prf_lc_prms].port_id =
                (uint8_t)int_fld[FLD_PORT];
        prf_lc_prms[nb_prf_lc_prms].queue_id =
                (uint8_t)int_fld[FLD_QUEUE];
        prf_lc_prms[nb_prf_lc_prms].high_perf =
                !!(uint8_t)int_fld[FLD_LCORE_HP];
        prf_lc_prms[nb_prf_lc_prms].lcore_idx =
                (uint8_t)int_fld[FLD_LCORE_IDX];
        ++nb_prf_lc_prms;
    }

    return 0;
}

int
parse_perf_core_list(const char *corelist)
{
    int i, idx = 0;
    unsigned int count = 0;
    char *end = NULL;
    int min, max;

    if (corelist == NULL) {
        printf("invalid core list\n");
        return -1;
    }


    /* Remove all blank characters ahead and after */
    while (isblank(*corelist))
        corelist++;
    i = strlen(corelist);
    while ((i > 0) && isblank(corelist[i - 1]))
        i--;

    /* Get list of cores */
    min = RTE_MAX_LCORE;
    do {
        while (isblank(*corelist))
            corelist++;
        if (*corelist == '\0')
            return -1;
        errno = 0;
        idx = strtoul(corelist, &end, 10);
        if (errno || end == NULL)
            return -1;
        while (isblank(*end))
            end++;
        if (*end == '-') {
            min = idx;
        } else if ((*end == ',') || (*end == '\0')) {
            max = idx;
            if (min == RTE_MAX_LCORE)
                min = idx;
            for (idx = min; idx <= max; idx++) {
                hp_lcores[count] = idx;
                count++;
            }
            min = RTE_MAX_LCORE;
        } else {
            printf("invalid core list\n");
            return -1;
        }
        corelist = end + 1;
    } while (*end != '\0');

    if (count == 0) {
        printf("invalid core list\n");
        return -1;
    }

    nb_hp_lcores = count;

    printf("Configured %d high performance cores\n", nb_hp_lcores);
    for (i = 0; i < nb_hp_lcores; i++)
        printf("\tHigh performance core %d %d\n",
                i, hp_lcores[i]);

    return 0;
}