uint32_t mask; /**< Mask (size-1) of ring. */
volatile uint32_t head; /**< Consumer head. */
volatile uint32_t tail; /**< Consumer tail. */
+#ifdef RTE_RING_SPLIT_PROD_CONS
} cons __rte_cache_aligned;
-
+#else
+ } cons;
+#endif
#ifdef RTE_LIBRTE_RING_DEBUG
struct rte_ring_debug_stats stats[RTE_MAX_LCORE];
#endif
- void * volatile ring[0] \
- __rte_cache_aligned; /**< Memory space of ring starts here. */
+ void * ring[0] __rte_cache_aligned; /**< Memory space of ring starts here.
+ * not volatile so need to be careful
+ * about compiler re-ordering */
};
+/* dummy assembly operation to prevent compiler re-ordering of instructions */
+#define COMPILER_BARRIER() do { asm volatile("" ::: "memory"); } while(0)
+
#define RING_F_SP_ENQ 0x0001 /**< The default enqueue is "single-producer". */
#define RING_F_SC_DEQ 0x0002 /**< The default dequeue is "single-consumer". */
#define RTE_RING_QUOT_EXCEED (1 << 31) /**< Quota exceed for burst ops */
*/
void rte_ring_dump(const struct rte_ring *r);
+/* the actual enqueue of pointers on the ring.
+ * Placed here since identical code needed in both
+ * single and multi producer enqueue functions */
+#define ENQUEUE_PTRS() do { \
+ const uint32_t size = r->prod.size; \
+ uint32_t idx = prod_head & mask; \
+ if (likely(idx + n < size)) { \
+ for (i = 0; i < (n & ((~(unsigned)0x3))); i+=4, idx+=4) { \
+ r->ring[idx] = obj_table[i]; \
+ r->ring[idx+1] = obj_table[i+1]; \
+ r->ring[idx+2] = obj_table[i+2]; \
+ r->ring[idx+3] = obj_table[i+3]; \
+ } \
+ switch (n & 0x3) { \
+ case 3: r->ring[idx++] = obj_table[i++]; \
+ case 2: r->ring[idx++] = obj_table[i++]; \
+ case 1: r->ring[idx++] = obj_table[i++]; \
+ } \
+ } else { \
+ for (i = 0; idx < size; i++, idx++)\
+ r->ring[idx] = obj_table[i]; \
+ for (idx = 0; i < n; i++, idx++) \
+ r->ring[idx] = obj_table[i]; \
+ } \
+} while(0)
+
+/* the actual copy of pointers on the ring to obj_table.
+ * Placed here since identical code needed in both
+ * single and multi consumer dequeue functions */
+#define DEQUEUE_PTRS() do { \
+ uint32_t idx = cons_head & mask; \
+ const uint32_t size = r->cons.size; \
+ if (likely(idx + n < size)) { \
+ for (i = 0; i < (n & (~(unsigned)0x3)); i+=4, idx+=4) {\
+ obj_table[i] = r->ring[idx]; \
+ obj_table[i+1] = r->ring[idx+1]; \
+ obj_table[i+2] = r->ring[idx+2]; \
+ obj_table[i+3] = r->ring[idx+3]; \
+ } \
+ switch (n & 0x3) { \
+ case 3: obj_table[i++] = r->ring[idx++]; \
+ case 2: obj_table[i++] = r->ring[idx++]; \
+ case 1: obj_table[i++] = r->ring[idx++]; \
+ } \
+ } else { \
+ for (i = 0; idx < size; i++, idx++) \
+ obj_table[i] = r->ring[idx]; \
+ for (idx = 0; i < n; i++, idx++) \
+ obj_table[i] = r->ring[idx]; \
+ } \
+} while (0)
+
/**
* @internal Enqueue several objects on the ring (multi-producers safe).
*
* if behavior = RTE_RING_QUEUE_VARIABLE
* - n: Actual number of objects enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
__rte_ring_mp_do_enqueue(struct rte_ring *r, void * const *obj_table,
unsigned n, enum rte_ring_queue_behavior behavior)
{
} while (unlikely(success == 0));
/* write entries in ring */
- for (i = 0; likely(i < n); i++)
- r->ring[(prod_head + i) & mask] = obj_table[i];
- rte_wmb();
+ ENQUEUE_PTRS();
+ COMPILER_BARRIER();
/* if we exceed the watermark */
if (unlikely(((mask + 1) - free_entries + n) > r->prod.watermark)) {
* if behavior = RTE_RING_QUEUE_VARIABLE
* - n: Actual number of objects enqueued.
*/
-static inline int
+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)
{
r->prod.head = prod_next;
/* write entries in ring */
- for (i = 0; likely(i < n); i++)
- r->ring[(prod_head + i) & mask] = obj_table[i];
- rte_wmb();
+ ENQUEUE_PTRS();
+ COMPILER_BARRIER();
/* if we exceed the watermark */
if (unlikely(((mask + 1) - free_entries + n) > r->prod.watermark)) {
* - n: Actual number of objects dequeued.
*/
-static inline int
+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)
{
entries = (prod_tail - cons_head);
/* Set the actual entries for dequeue */
- if (unlikely(n > entries)) {
+ if (n > entries) {
if (behavior == RTE_RING_QUEUE_FIXED) {
__RING_STAT_ADD(r, deq_fail, n);
return -ENOENT;
} while (unlikely(success == 0));
/* copy in table */
- rte_rmb();
- for (i = 0; likely(i < n); i++) {
- obj_table[i] = r->ring[(cons_head + i) & mask];
- }
+ DEQUEUE_PTRS();
+ COMPILER_BARRIER();
/*
* If there are other dequeues in progress that preceded us,
* if behavior = RTE_RING_QUEUE_VARIABLE
* - n: Actual number of objects dequeued.
*/
-static inline int
+static inline int __attribute__((always_inline))
__rte_ring_sc_do_dequeue(struct rte_ring *r, void **obj_table,
unsigned n, enum rte_ring_queue_behavior behavior)
{
* and size(ring)-1. */
entries = prod_tail - cons_head;
- if (unlikely(n > entries)) {
+ if (n > entries) {
if (behavior == RTE_RING_QUEUE_FIXED) {
__RING_STAT_ADD(r, deq_fail, n);
return -ENOENT;
r->cons.head = cons_next;
/* copy in table */
- rte_rmb();
- for (i = 0; likely(i < n); i++) {
- obj_table[i] = r->ring[(cons_head + i) & mask];
- }
+ DEQUEUE_PTRS();
+ COMPILER_BARRIER();
__RING_STAT_ADD(r, deq_success, n);
r->cons.tail = cons_next;
* high water mark is exceeded.
* - -ENOBUFS: Not enough room in the ring to enqueue, no object is enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_mp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
unsigned n)
{
* high water mark is exceeded.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_sp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
unsigned n)
{
* high water mark is exceeded.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
unsigned n)
{
* high water mark is exceeded.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_mp_enqueue(struct rte_ring *r, void *obj)
{
return rte_ring_mp_enqueue_bulk(r, &obj, 1);
* high water mark is exceeded.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_sp_enqueue(struct rte_ring *r, void *obj)
{
return rte_ring_sp_enqueue_bulk(r, &obj, 1);
* high water mark is exceeded.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_enqueue(struct rte_ring *r, void *obj)
{
if (r->prod.sp_enqueue)
* - -ENOENT: Not enough entries in the ring to dequeue; no object is
* dequeued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_mc_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned n)
{
return __rte_ring_mc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED);
* - -ENOENT: Not enough entries in the ring to dequeue; no object is
* dequeued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_sc_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned n)
{
return __rte_ring_sc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED);
* - -ENOENT: Not enough entries in the ring to dequeue, no object is
* dequeued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned n)
{
if (r->cons.sc_dequeue)
* - -ENOENT: Not enough entries in the ring to dequeue; no object is
* dequeued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_mc_dequeue(struct rte_ring *r, void **obj_p)
{
return rte_ring_mc_dequeue_bulk(r, obj_p, 1);
* - -ENOENT: Not enough entries in the ring to dequeue, no object is
* dequeued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_sc_dequeue(struct rte_ring *r, void **obj_p)
{
return rte_ring_sc_dequeue_bulk(r, obj_p, 1);
* - -ENOENT: Not enough entries in the ring to dequeue, no object is
* dequeued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_dequeue(struct rte_ring *r, void **obj_p)
{
if (r->cons.sc_dequeue)
* @return
* - n: Actual number of objects enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_mp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
unsigned n)
{
* @return
* - n: Actual number of objects enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_sp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
unsigned n)
{
* @return
* - n: Actual number of objects enqueued.
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_enqueue_burst(struct rte_ring *r, void * const *obj_table,
unsigned n)
{
* @return
* - n: Actual number of objects dequeued, 0 if ring is empty
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_mc_dequeue_burst(struct rte_ring *r, void **obj_table, unsigned n)
{
return __rte_ring_mc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE);
* @return
* - n: Actual number of objects dequeued, 0 if ring is empty
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_sc_dequeue_burst(struct rte_ring *r, void **obj_table, unsigned n)
{
return __rte_ring_sc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE);
* @return
* - Number of objects dequeued, or a negative error code on error
*/
-static inline int
+static inline int __attribute__((always_inline))
rte_ring_dequeue_burst(struct rte_ring *r, void **obj_table, unsigned n)
{
if (r->cons.sc_dequeue)
git.droids-corp.org / dpdk.git / commitdiff