+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(RTE_LOG_ERR, RTE_LOGTYPE_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(RTE_LOG_ERR, RTE_LOGTYPE_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;
+}
+