/*-
* BSD LICENSE
- *
- * Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
+ *
+ * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
* are met:
- *
- * * Redistributions of source code must retain the above copyright
+ *
+ * * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
* distribution.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
*/
/*
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.
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 */
};
#define RING_F_SP_ENQ 0x0001 /**< The default enqueue is "single-producer". */
#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
+ * 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();
+ 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))
* 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();
+ rte_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();
+ rte_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();
+ rte_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)
/**
* 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
* @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)
{
if (r->prod.sp_enqueue)
- return rte_ring_sp_enqueue_burst(r, obj_table, n);
+ return rte_ring_sp_enqueue_burst(r, obj_table, n);
else
- return rte_ring_mp_enqueue_burst(r, obj_table, n);
+ return rte_ring_mp_enqueue_burst(r, obj_table, 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)
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