+/* return the size of memory occupied by a ring */
+ssize_t
+rte_ring_get_memsize(unsigned int count)
+{
+ return rte_ring_get_memsize_elem(sizeof(void *), count);
+}
+
+/*
+ * internal helper function to reset prod/cons head-tail values.
+ */
+static void
+reset_headtail(void *p)
+{
+ struct rte_ring_headtail *ht;
+ struct rte_ring_hts_headtail *ht_hts;
+ struct rte_ring_rts_headtail *ht_rts;
+
+ ht = p;
+ ht_hts = p;
+ ht_rts = p;
+
+ switch (ht->sync_type) {
+ case RTE_RING_SYNC_MT:
+ case RTE_RING_SYNC_ST:
+ ht->head = 0;
+ ht->tail = 0;
+ break;
+ case RTE_RING_SYNC_MT_RTS:
+ ht_rts->head.raw = 0;
+ ht_rts->tail.raw = 0;
+ break;
+ case RTE_RING_SYNC_MT_HTS:
+ ht_hts->ht.raw = 0;
+ break;
+ default:
+ /* unknown sync mode */
+ RTE_ASSERT(0);
+ }
+}
+
+void
+rte_ring_reset(struct rte_ring *r)
+{
+ reset_headtail(&r->prod);
+ reset_headtail(&r->cons);
+}
+
+/*
+ * helper function, calculates sync_type values for prod and cons
+ * based on input flags. Returns zero at success or negative
+ * errno value otherwise.
+ */
+static int
+get_sync_type(uint32_t flags, enum rte_ring_sync_type *prod_st,
+ enum rte_ring_sync_type *cons_st)
+{
+ static const uint32_t prod_st_flags =
+ (RING_F_SP_ENQ | RING_F_MP_RTS_ENQ | RING_F_MP_HTS_ENQ);
+ static const uint32_t cons_st_flags =
+ (RING_F_SC_DEQ | RING_F_MC_RTS_DEQ | RING_F_MC_HTS_DEQ);
+
+ switch (flags & prod_st_flags) {
+ case 0:
+ *prod_st = RTE_RING_SYNC_MT;
+ break;
+ case RING_F_SP_ENQ:
+ *prod_st = RTE_RING_SYNC_ST;
+ break;
+ case RING_F_MP_RTS_ENQ:
+ *prod_st = RTE_RING_SYNC_MT_RTS;
+ break;
+ case RING_F_MP_HTS_ENQ:
+ *prod_st = RTE_RING_SYNC_MT_HTS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (flags & cons_st_flags) {
+ case 0:
+ *cons_st = RTE_RING_SYNC_MT;
+ break;
+ case RING_F_SC_DEQ:
+ *cons_st = RTE_RING_SYNC_ST;
+ break;
+ case RING_F_MC_RTS_DEQ:
+ *cons_st = RTE_RING_SYNC_MT_RTS;
+ break;
+ case RING_F_MC_HTS_DEQ:
+ *cons_st = RTE_RING_SYNC_MT_HTS;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+