examples/ip_pipeline/kni.c

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

#include <stdlib.h>
#include <string.h>

#include <rte_ethdev.h>
#include <rte_bus_pci.h>
#include <rte_string_fns.h>

#include "kni.h"
#include "mempool.h"
#include "link.h"

static struct kni_list kni_list;

#ifndef KNI_MAX
#define KNI_MAX                                            16
#endif

int
kni_init(void)
{
    TAILQ_INIT(&kni_list);

#ifdef RTE_LIBRTE_KNI
    rte_kni_init(KNI_MAX);
#endif

    return 0;
}

struct kni *
kni_find(const char *name)
{
    struct kni *kni;

    if (name == NULL)
        return NULL;

    TAILQ_FOREACH(kni, &kni_list, node)
        if (strcmp(kni->name, name) == 0)
            return kni;

    return NULL;
}

#ifndef RTE_LIBRTE_KNI

struct kni *
kni_create(const char *name __rte_unused,
    struct kni_params *params __rte_unused)
{
    return NULL;
}

void
kni_handle_request(void)
{
    return;
}

#else

static int
kni_config_network_interface(uint16_t port_id, uint8_t if_up)
{
    int ret = 0;

    if (!rte_eth_dev_is_valid_port(port_id))
        return -EINVAL;

    ret = (if_up) ?
        rte_eth_dev_set_link_up(port_id) :
        rte_eth_dev_set_link_down(port_id);

    return ret;
}

static int
kni_change_mtu(uint16_t port_id, unsigned int new_mtu)
{
    int ret;

    if (!rte_eth_dev_is_valid_port(port_id))
        return -EINVAL;

    if (new_mtu > RTE_ETHER_MAX_LEN)
        return -EINVAL;

    /* Set new MTU */
    ret = rte_eth_dev_set_mtu(port_id, new_mtu);
    if (ret < 0)
        return ret;

    return 0;
}

struct kni *
kni_create(const char *name, struct kni_params *params)
{
    struct rte_eth_dev_info dev_info;
    struct rte_kni_conf kni_conf;
    struct rte_kni_ops kni_ops;
    struct kni *kni;
    struct mempool *mempool;
    struct link *link;
    struct rte_kni *k;
    const struct rte_pci_device *pci_dev;
    const struct rte_bus *bus = NULL;
    int ret;

    /* Check input params */
    if ((name == NULL) ||
        kni_find(name) ||
        (params == NULL))
        return NULL;

    mempool = mempool_find(params->mempool_name);
    link = link_find(params->link_name);
    if ((mempool == NULL) ||
        (link == NULL))
        return NULL;

    /* Resource create */
    ret = rte_eth_dev_info_get(link->port_id, &dev_info);
    if (ret != 0)
        return NULL;

    memset(&kni_conf, 0, sizeof(kni_conf));
    strlcpy(kni_conf.name, name, RTE_KNI_NAMESIZE);
    kni_conf.force_bind = params->force_bind;
    kni_conf.core_id = params->thread_id;
    kni_conf.group_id = link->port_id;
    kni_conf.mbuf_size = mempool->buffer_size;
    if (dev_info.device)
        bus = rte_bus_find_by_device(dev_info.device);
    if (bus && !strcmp(bus->name, "pci")) {
        pci_dev = RTE_DEV_TO_PCI(dev_info.device);
        kni_conf.addr = pci_dev->addr;
        kni_conf.id = pci_dev->id;
    }

    memset(&kni_ops, 0, sizeof(kni_ops));
    kni_ops.port_id = link->port_id;
    kni_ops.config_network_if = kni_config_network_interface;
    kni_ops.change_mtu = kni_change_mtu;

    k = rte_kni_alloc(mempool->m, &kni_conf, &kni_ops);
    if (k == NULL)
        return NULL;

    /* Node allocation */
    kni = calloc(1, sizeof(struct kni));
    if (kni == NULL)
        return NULL;

    /* Node fill in */
    strlcpy(kni->name, name, sizeof(kni->name));
    kni->k = k;

    /* Node add to list */
    TAILQ_INSERT_TAIL(&kni_list, kni, node);

    return kni;
}

void
kni_handle_request(void)
{
    struct kni *kni;

    TAILQ_FOREACH(kni, &kni_list, node)
        rte_kni_handle_request(kni->k);
}

#endif