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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <sys/queue.h>
#include <stdint.h>
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <inttypes.h>
#include <rte_memory.h>
#include <rte_launch.h>
#include <rte_eal.h>
#include <rte_eal_memconfig.h>
#include <rte_per_lcore.h>
#include <rte_lcore.h>
#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_log.h>
#include <rte_string_fns.h>
#include <rte_debug.h>
#include "eal_private.h"
TAILQ_HEAD(rte_tailq_elem_head, rte_tailq_elem);
/* local tailq list */
static struct rte_tailq_elem_head rte_tailq_elem_head =
TAILQ_HEAD_INITIALIZER(rte_tailq_elem_head);
/* number of tailqs registered, -1 before call to rte_eal_tailqs_init */
static int rte_tailqs_count = -1;
struct rte_tailq_head *
rte_eal_tailq_lookup(const char *name)
{
unsigned i;
struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
if (name == NULL)
return NULL;
for (i = 0; i < RTE_MAX_TAILQ; i++) {
if (!strncmp(name, mcfg->tailq_head[i].name,
RTE_TAILQ_NAMESIZE-1))
return &mcfg->tailq_head[i];
}
return NULL;
}
void
rte_dump_tailq(FILE *f)
{
struct rte_mem_config *mcfg;
unsigned i = 0;
mcfg = rte_eal_get_configuration()->mem_config;
rte_rwlock_read_lock(&mcfg->qlock);
for (i = 0; i < RTE_MAX_TAILQ; i++) {
const struct rte_tailq_head *tailq = &mcfg->tailq_head[i];
const struct rte_tailq_entry_head *head = &tailq->tailq_head;
fprintf(f, "Tailq %u: qname:<%s>, tqh_first:%p, tqh_last:%p\n",
i, tailq->name, head->tqh_first, head->tqh_last);
}
rte_rwlock_read_unlock(&mcfg->qlock);
}
static struct rte_tailq_head *
rte_eal_tailq_create(const char *name)
{
struct rte_tailq_head *head = NULL;
if (!rte_eal_tailq_lookup(name) &&
(rte_tailqs_count + 1 < RTE_MAX_TAILQ)) {
struct rte_mem_config *mcfg;
mcfg = rte_eal_get_configuration()->mem_config;
head = &mcfg->tailq_head[rte_tailqs_count];
snprintf(head->name, sizeof(head->name) - 1, "%s", name);
TAILQ_INIT(&head->tailq_head);
rte_tailqs_count++;
}
return head;
}
/* local register, used to store "early" tailqs before rte_eal_init() and to
* ensure secondary process only registers tailqs once. */
static int
rte_eal_tailq_local_register(struct rte_tailq_elem *t)
{
struct rte_tailq_elem *temp;
TAILQ_FOREACH(temp, &rte_tailq_elem_head, next) {
if (!strncmp(t->name, temp->name, sizeof(temp->name)))
return -1;
}
TAILQ_INSERT_TAIL(&rte_tailq_elem_head, t, next);
return 0;
}
static void
rte_eal_tailq_update(struct rte_tailq_elem *t)
{
if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
/* primary process is the only one that creates */
t->head = rte_eal_tailq_create(t->name);
} else {
t->head = rte_eal_tailq_lookup(t->name);
}
}
int
rte_eal_tailq_register(struct rte_tailq_elem *t)
{
if (rte_eal_tailq_local_register(t) < 0) {
RTE_LOG(ERR, EAL,
"%s tailq is already registered\n", t->name);
goto error;
}
/* if a register happens after rte_eal_tailqs_init(), then we can update
* tailq head */
if (rte_tailqs_count >= 0) {
rte_eal_tailq_update(t);
if (t->head == NULL) {
RTE_LOG(ERR, EAL,
"Cannot initialize tailq: %s\n", t->name);
TAILQ_REMOVE(&rte_tailq_elem_head, t, next);
goto error;
}
}
return 0;
error:
t->head = NULL;
return -1;
}
int
rte_eal_tailqs_init(void)
{
struct rte_tailq_elem *t;
rte_tailqs_count = 0;
TAILQ_FOREACH(t, &rte_tailq_elem_head, next) {
/* second part of register job for "early" tailqs, see
* rte_eal_tailq_register and EAL_REGISTER_TAILQ */
rte_eal_tailq_update(t);
if (t->head == NULL) {
RTE_LOG(ERR, EAL,
"Cannot initialize tailq: %s\n", t->name);
/* TAILQ_REMOVE not needed, error is already fatal */
goto fail;
}
}
return 0;
fail:
rte_dump_tailq(stderr);
return -1;
}
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