extern "C" {
#endif
+#include <stdio.h>
#include <stdint.h>
#include <sys/queue.h>
#include <errno.h>
#endif
#define RTE_RING_NAMESIZE 32 /**< The maximum length of a ring name. */
+#define RTE_RING_MZ_PREFIX "RG_"
/**
* An RTE ring structure.
* 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 */
#define __RING_STAT_ADD(r, name, n) do {} while(0)
#endif
+/**
+ * Calculate the memory size needed for a ring
+ *
+ * This function returns the number of bytes needed for a ring, given
+ * the number of elements in it. This value is the sum of the size of
+ * the structure rte_ring and the size of the memory needed by the
+ * objects pointers. The value is aligned to a cache line size.
+ *
+ * @param count
+ * The number of elements in the ring (must be a power of 2).
+ * @return
+ * - The memory size needed for the ring on success.
+ * - -EINVAL if count is not a power of 2.
+ */
+ssize_t rte_ring_get_memsize(unsigned count);
+
+/**
+ * Initialize a ring structure.
+ *
+ * Initialize a ring structure in memory pointed by "r". The size of the
+ * memory area must be large enough to store the ring structure and the
+ * object table. It is advised to use rte_ring_get_memsize() to get the
+ * appropriate size.
+ *
+ * The ring size is set to *count*, which must be a power of two. Water
+ * marking is disabled by default. The real usable ring size is
+ * *count-1* instead of *count* to differentiate a free ring from an
+ * empty ring.
+ *
+ * The ring is not added in RTE_TAILQ_RING global list. Indeed, the
+ * memory given by the caller may not be shareable among dpdk
+ * processes.
+ *
+ * @param r
+ * The pointer to the ring structure followed by the objects table.
+ * @param name
+ * The name of the ring.
+ * @param count
+ * The number of elements in the ring (must be a power of 2).
+ * @param flags
+ * An OR of the following:
+ * - RING_F_SP_ENQ: If this flag is set, the default behavior when
+ * using ``rte_ring_enqueue()`` or ``rte_ring_enqueue_bulk()``
+ * is "single-producer". Otherwise, it is "multi-producers".
+ * - RING_F_SC_DEQ: If this flag is set, the default behavior when
+ * using ``rte_ring_dequeue()`` or ``rte_ring_dequeue_bulk()``
+ * is "single-consumer". Otherwise, it is "multi-consumers".
+ * @return
+ * 0 on success, or a negative value on error.
+ */
+int rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
+ unsigned flags);
+
/**
* Create a new ring named *name* in memory.
*
- * This function uses ``memzone_reserve()`` to allocate memory. Its size is
- * set to *count*, which must be a power of two. Water marking is
- * disabled by default.
- * Note that the real usable ring size is *count-1* instead of
- * *count*.
+ * This function uses ``memzone_reserve()`` to allocate memory. Then it
+ * calls rte_ring_init() to initialize an empty ring.
+ *
+ * The new ring size is set to *count*, which must be a power of
+ * two. Water marking is disabled by default. The real usable ring size
+ * is *count-1* instead of *count* to differentiate a free ring from an
+ * empty ring.
+ *
+ * The ring is added in RTE_TAILQ_RING list.
*
* @param name
* The name of the ring.
/**
* Dump the status of the ring to the console.
*
+ * @param f
+ * A pointer to a file for output
* @param r
* A pointer to the ring structure.
*/
-void rte_ring_dump(const struct rte_ring *r);
+void rte_ring_dump(FILE *f, const struct rte_ring *r);
/* the actual enqueue of pointers on the ring.
* Placed here since identical code needed in both
/* write entries in ring */
ENQUEUE_PTRS();
- COMPILER_BARRIER();
+ rte_compiler_barrier();
/* if we exceed the watermark */
if (unlikely(((mask + 1) - free_entries + n) > r->prod.watermark)) {
}
/*
- * If there are other enqueues in progress that preceeded us,
+ * If there are other enqueues in progress that preceded us,
* we need to wait for them to complete
*/
while (unlikely(r->prod.tail != prod_head))
/* write entries in ring */
ENQUEUE_PTRS();
- COMPILER_BARRIER();
+ rte_compiler_barrier();
/* if we exceed the watermark */
if (unlikely(((mask + 1) - free_entries + n) > r->prod.watermark)) {
/* copy in table */
DEQUEUE_PTRS();
- COMPILER_BARRIER();
+ rte_compiler_barrier();
/*
* If there are other dequeues in progress that preceded us,
/* copy in table */
DEQUEUE_PTRS();
- COMPILER_BARRIER();
+ rte_compiler_barrier();
__RING_STAT_ADD(r, deq_success, n);
r->cons.tail = cons_next;
/**
* Dump the status of all rings on the console
+ *
+ * @param f
+ * A pointer to a file for output
*/
-void rte_ring_list_dump(void);
+void rte_ring_list_dump(FILE *f);
/**
* Search a ring from its name
git.droids-corp.org / dpdk.git / blobdiff