- * The number of objects to add in the ring from the obj_table.
- * @param behavior
- * RTE_RING_QUEUE_FIXED: Enqueue a fixed number of items from a ring
- * RTE_RING_QUEUE_VARIABLE: Enqueue as many items a possible from ring
- * @return
- * Depend on the behavior value
- * if behavior = RTE_RING_QUEUE_FIXED
- * - 0: Success; objects enqueue.
- * - -EDQUOT: Quota exceeded. The objects have been enqueued, but the
- * high water mark is exceeded.
- * - -ENOBUFS: Not enough room in the ring to enqueue, no object is enqueued.
- * if behavior = RTE_RING_QUEUE_VARIABLE
- * - n: Actual number of objects enqueued.
- */
-static inline int __attribute__((always_inline))
-__rte_ring_sp_do_enqueue(struct rte_ring *r, void * const *obj_table,
- unsigned n, enum rte_ring_queue_behavior behavior)
-{
- uint32_t prod_head, cons_tail;
- uint32_t prod_next, free_entries;
- unsigned i;
- uint32_t mask = r->prod.mask;
- int ret;
-
- prod_head = r->prod.head;
- cons_tail = r->cons.tail;
- /* The subtraction is done between two unsigned 32bits value
- * (the result is always modulo 32 bits even if we have
- * prod_head > cons_tail). So 'free_entries' is always between 0
- * and size(ring)-1. */
- free_entries = mask + cons_tail - prod_head;
-
- /* check that we have enough room in ring */
- if (unlikely(n > free_entries)) {
- if (behavior == RTE_RING_QUEUE_FIXED) {
- __RING_STAT_ADD(r, enq_fail, n);
- return -ENOBUFS;
- }
- else {
- /* No free entry available */
- if (unlikely(free_entries == 0)) {
- __RING_STAT_ADD(r, enq_fail, n);
- return 0;
- }
-
- n = free_entries;
- }
- }
-
- prod_next = prod_head + n;
- r->prod.head = prod_next;
-
- /* write entries in ring */
- ENQUEUE_PTRS();
- rte_compiler_barrier();
-
- /* if we exceed the watermark */
- if (unlikely(((mask + 1) - free_entries + n) > r->prod.watermark)) {
- ret = (behavior == RTE_RING_QUEUE_FIXED) ? -EDQUOT :
- (int)(n | RTE_RING_QUOT_EXCEED);
- __RING_STAT_ADD(r, enq_quota, n);
- }
- else {
- ret = (behavior == RTE_RING_QUEUE_FIXED) ? 0 : n;
- __RING_STAT_ADD(r, enq_success, n);
- }
-
- r->prod.tail = prod_next;
- return ret;
-}
-
-/**
- * @internal Dequeue several objects from a ring (multi-consumers safe). When
- * the request objects are more than the available objects, only dequeue the
- * actual number of objects
- *
- * This function uses a "compare and set" instruction to move the
- * consumer index atomically.
- *
- * @param r
- * A pointer to the ring structure.
- * @param obj_table
- * A pointer to a table of void * pointers (objects) that will be filled.
- * @param n
- * The number of objects to dequeue from the ring to the obj_table.
- * @param behavior
- * RTE_RING_QUEUE_FIXED: Dequeue a fixed number of items from a ring
- * RTE_RING_QUEUE_VARIABLE: Dequeue as many items a possible from ring
- * @return
- * Depend on the behavior value
- * if behavior = RTE_RING_QUEUE_FIXED
- * - 0: Success; objects dequeued.
- * - -ENOENT: Not enough entries in the ring to dequeue; no object is
- * dequeued.
- * if behavior = RTE_RING_QUEUE_VARIABLE
- * - n: Actual number of objects dequeued.
- */
-
-static inline int __attribute__((always_inline))
-__rte_ring_mc_do_dequeue(struct rte_ring *r, void **obj_table,
- unsigned n, enum rte_ring_queue_behavior behavior)
-{
- uint32_t cons_head, prod_tail;
- uint32_t cons_next, entries;
- const unsigned max = n;
- int success;
- unsigned i;
- uint32_t mask = r->prod.mask;
-
- /* move cons.head atomically */
- do {
- /* Restore n as it may change every loop */
- n = max;
-
- cons_head = r->cons.head;
- prod_tail = r->prod.tail;
- /* The subtraction is done between two unsigned 32bits value
- * (the result is always modulo 32 bits even if we have
- * cons_head > prod_tail). So 'entries' is always between 0
- * and size(ring)-1. */
- entries = (prod_tail - cons_head);
-
- /* Set the actual entries for dequeue */
- if (n > entries) {
- if (behavior == RTE_RING_QUEUE_FIXED) {
- __RING_STAT_ADD(r, deq_fail, n);
- return -ENOENT;
- }
- else {
- if (unlikely(entries == 0)){
- __RING_STAT_ADD(r, deq_fail, n);
- return 0;
- }
-
- n = entries;
- }
- }
-
- cons_next = cons_head + n;
- success = rte_atomic32_cmpset(&r->cons.head, cons_head,
- cons_next);
- } while (unlikely(success == 0));
-
- /* copy in table */
- DEQUEUE_PTRS();
- rte_compiler_barrier();
-
- /*
- * If there are other dequeues in progress that preceded us,
- * we need to wait for them to complete
- */
- while (unlikely(r->cons.tail != cons_head))
- rte_pause();
-
- __RING_STAT_ADD(r, deq_success, n);
- r->cons.tail = cons_next;
-
- return behavior == RTE_RING_QUEUE_FIXED ? 0 : n;
-}
-
-/**
- * @internal Dequeue several objects from a ring (NOT multi-consumers safe).
- * When the request objects are more than the available objects, only dequeue
- * the actual number of objects
- *
- * @param r
- * A pointer to the ring structure.
- * @param obj_table
- * A pointer to a table of void * pointers (objects) that will be filled.
- * @param n
- * The number of objects to dequeue from the ring to the obj_table.