#include <rte_atomic.h>
#include <rte_branch_prediction.h>
#include <rte_memzone.h>
+#include <rte_pause.h>
#define RTE_TAILQ_RING_NAME "RTE_RING"
* compatibility requirements, it could be changed to RTE_RING_NAMESIZE
* next time the ABI changes
*/
- char name[RTE_MEMZONE_NAMESIZE]; /**< Name of the ring. */
+ char name[RTE_MEMZONE_NAMESIZE] __rte_cache_aligned; /**< Name of the ring. */
int flags; /**< Flags supplied at creation. */
const struct rte_memzone *memzone;
/**< Memzone, if any, containing the rte_ring */
uint32_t size; /**< Size of ring. */
uint32_t mask; /**< Mask (size-1) of ring. */
+ uint32_t capacity; /**< Usable size of ring */
/** Ring producer status. */
struct rte_ring_headtail prod __rte_aligned(PROD_ALIGN);
/** Ring consumer status. */
struct rte_ring_headtail cons __rte_aligned(CONS_ALIGN);
-
- void *ring[] __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_F_SC_DEQ 0x0002 /**< The default dequeue is "single-consumer". */
-#define RTE_RING_SZ_MASK (unsigned)(0x0fffffff) /**< Ring size mask */
+/**
+ * Ring is to hold exactly requested number of entries.
+ * Without this flag set, the ring size requested must be a power of 2, and the
+ * usable space will be that size - 1. With the flag, the requested size will
+ * be rounded up to the next power of two, but the usable space will be exactly
+ * that requested. Worst case, if a power-of-2 size is requested, half the
+ * ring space will be wasted.
+ */
+#define RING_F_EXACT_SZ 0x0004
+#define RTE_RING_SZ_MASK (0x7fffffffU) /**< Ring size mask */
+
+/* @internal defines for passing to the enqueue dequeue worker functions */
+#define __IS_SP 1
+#define __IS_MP 0
+#define __IS_SC 1
+#define __IS_MC 0
/**
* Calculate the memory size needed for a ring
/* 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->size; \
- uint32_t idx = prod_head & mask; \
+#define ENQUEUE_PTRS(r, ring_start, prod_head, obj_table, n, obj_type) do { \
+ unsigned int i; \
+ const uint32_t size = (r)->size; \
+ uint32_t idx = prod_head & (r)->mask; \
+ obj_type *ring = (obj_type *)ring_start; \
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]; \
+ ring[idx] = obj_table[i]; \
+ ring[idx+1] = obj_table[i+1]; \
+ ring[idx+2] = obj_table[i+2]; \
+ 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++]; \
+ case 3: \
+ ring[idx++] = obj_table[i++]; /* fallthrough */ \
+ case 2: \
+ ring[idx++] = obj_table[i++]; /* fallthrough */ \
+ case 1: \
+ ring[idx++] = obj_table[i++]; \
} \
} else { \
for (i = 0; idx < size; i++, idx++)\
- r->ring[idx] = obj_table[i]; \
+ ring[idx] = obj_table[i]; \
for (idx = 0; i < n; i++, idx++) \
- r->ring[idx] = obj_table[i]; \
+ ring[idx] = obj_table[i]; \
} \
-} while(0)
+} 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->size; \
+#define DEQUEUE_PTRS(r, ring_start, cons_head, obj_table, n, obj_type) do { \
+ unsigned int i; \
+ uint32_t idx = cons_head & (r)->mask; \
+ const uint32_t size = (r)->size; \
+ obj_type *ring = (obj_type *)ring_start; \
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]; \
+ obj_table[i] = ring[idx]; \
+ obj_table[i+1] = ring[idx+1]; \
+ obj_table[i+2] = ring[idx+2]; \
+ obj_table[i+3] = 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++]; \
+ case 3: \
+ obj_table[i++] = ring[idx++]; /* fallthrough */ \
+ case 2: \
+ obj_table[i++] = ring[idx++]; /* fallthrough */ \
+ case 1: \
+ obj_table[i++] = ring[idx++]; \
} \
} else { \
for (i = 0; idx < size; i++, idx++) \
- obj_table[i] = r->ring[idx]; \
+ obj_table[i] = ring[idx]; \
for (idx = 0; i < n; i++, idx++) \
- obj_table[i] = r->ring[idx]; \
+ obj_table[i] = ring[idx]; \
} \
} while (0)
+static __rte_always_inline void
+update_tail(struct rte_ring_headtail *ht, uint32_t old_val, uint32_t new_val,
+ uint32_t single)
+{
+ /*
+ * If there are other enqueues/dequeues in progress that preceded us,
+ * we need to wait for them to complete
+ */
+ if (!single)
+ while (unlikely(ht->tail != old_val))
+ rte_pause();
+
+ ht->tail = new_val;
+}
+
/**
- * @internal Enqueue several objects on the ring (multi-producers safe).
- *
- * This function uses a "compare and set" instruction to move the
- * producer index atomically.
+ * @internal This function updates the producer head for enqueue
*
* @param r
- * A pointer to the ring structure.
- * @param obj_table
- * A pointer to a table of void * pointers (objects).
+ * A pointer to the ring structure
+ * @param is_sp
+ * Indicates whether multi-producer path is needed or not
* @param n
- * The number of objects to add in the ring from the obj_table.
+ * The number of elements we will want to enqueue, i.e. how far should the
+ * head be moved
* @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
+ * RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param old_head
+ * Returns head value as it was before the move, i.e. where enqueue starts
+ * @param new_head
+ * Returns the current/new head value i.e. where enqueue finishes
+ * @param free_entries
+ * Returns the amount of free space in the ring BEFORE head was moved
* @return
* Actual number of objects enqueued.
* If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
*/
-static inline unsigned int __attribute__((always_inline))
-__rte_ring_mp_do_enqueue(struct rte_ring *r, void * const *obj_table,
- unsigned int n, enum rte_ring_queue_behavior behavior,
- unsigned int *free_space)
+static __rte_always_inline unsigned int
+__rte_ring_move_prod_head(struct rte_ring *r, int is_sp,
+ unsigned int n, enum rte_ring_queue_behavior behavior,
+ uint32_t *old_head, uint32_t *new_head,
+ uint32_t *free_entries)
{
- uint32_t prod_head, prod_next;
- uint32_t cons_tail, free_entries;
- const unsigned int max = n;
+ const uint32_t capacity = r->capacity;
+ unsigned int max = n;
int success;
- unsigned int i;
- uint32_t mask = r->mask;
- /* move prod.head atomically */
do {
/* Reset n to the initial burst count */
n = max;
- prod_head = r->prod.head;
- cons_tail = r->cons.tail;
- /* The subtraction is done between two unsigned 32bits value
+ *old_head = r->prod.head;
+
+ /* add rmb barrier to avoid load/load reorder in weak
+ * memory model. It is noop on x86
+ */
+ rte_smp_rmb();
+
+ const uint32_t 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);
+ * *old_head > cons_tail). So 'free_entries' is always between 0
+ * and capacity (which is < size).
+ */
+ *free_entries = (capacity + cons_tail - *old_head);
/* check that we have enough room in ring */
- if (unlikely(n > free_entries))
+ if (unlikely(n > *free_entries))
n = (behavior == RTE_RING_QUEUE_FIXED) ?
- 0 : free_entries;
+ 0 : *free_entries;
if (n == 0)
- goto end;
+ return 0;
- prod_next = prod_head + n;
- success = rte_atomic32_cmpset(&r->prod.head, prod_head,
- prod_next);
+ *new_head = *old_head + n;
+ if (is_sp)
+ r->prod.head = *new_head, success = 1;
+ else
+ success = rte_atomic32_cmpset(&r->prod.head,
+ *old_head, *new_head);
} while (unlikely(success == 0));
-
- /* write entries in ring */
- ENQUEUE_PTRS();
- rte_smp_wmb();
-
- /*
- * 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))
- rte_pause();
-
- r->prod.tail = prod_next;
-end:
- if (free_space != NULL)
- *free_space = free_entries - n;
return n;
}
/**
- * @internal Enqueue several objects on a ring (NOT multi-producers safe).
+ * @internal Enqueue several objects on the ring
*
- * @param r
+ * @param r
* A pointer to the ring structure.
* @param obj_table
* A pointer to a table of void * pointers (objects).
* 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
+ * RTE_RING_QUEUE_VARIABLE: Enqueue as many items as possible from ring
+ * @param is_sp
+ * Indicates whether to use single producer or multi-producer head update
+ * @param free_space
+ * returns the amount of space after the enqueue operation has finished
* @return
* Actual number of objects enqueued.
* If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
*/
-static inline unsigned int __attribute__((always_inline))
-__rte_ring_sp_do_enqueue(struct rte_ring *r, void * const *obj_table,
- unsigned int n, enum rte_ring_queue_behavior behavior,
- unsigned int *free_space)
+static __rte_always_inline unsigned int
+__rte_ring_do_enqueue(struct rte_ring *r, void * const *obj_table,
+ unsigned int n, enum rte_ring_queue_behavior behavior,
+ int is_sp, unsigned int *free_space)
{
- uint32_t prod_head, cons_tail;
- uint32_t prod_next, free_entries;
- unsigned int i;
- uint32_t mask = r->mask;
-
- 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))
- n = (behavior == RTE_RING_QUEUE_FIXED) ? 0 : free_entries;
+ uint32_t prod_head, prod_next;
+ uint32_t free_entries;
+ n = __rte_ring_move_prod_head(r, is_sp, n, behavior,
+ &prod_head, &prod_next, &free_entries);
if (n == 0)
goto end;
-
- prod_next = prod_head + n;
- r->prod.head = prod_next;
-
- /* write entries in ring */
- ENQUEUE_PTRS();
+ ENQUEUE_PTRS(r, &r[1], prod_head, obj_table, n, void *);
rte_smp_wmb();
- r->prod.tail = prod_next;
+ update_tail(&r->prod, prod_head, prod_next, is_sp);
end:
if (free_space != NULL)
*free_space = free_entries - n;
}
/**
- * @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.
+ * @internal This function updates the consumer head for dequeue
*
* @param r
- * A pointer to the ring structure.
- * @param obj_table
- * A pointer to a table of void * pointers (objects) that will be filled.
+ * A pointer to the ring structure
+ * @param is_sc
+ * Indicates whether multi-consumer path is needed or not
* @param n
- * The number of objects to dequeue from the ring to the obj_table.
+ * The number of elements we will want to enqueue, i.e. how far should the
+ * head be moved
* @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
+ * RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param old_head
+ * Returns head value as it was before the move, i.e. where dequeue starts
+ * @param new_head
+ * Returns the current/new head value i.e. where dequeue finishes
+ * @param entries
+ * Returns the number of entries in the ring BEFORE head was moved
* @return
* - Actual number of objects dequeued.
* If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
*/
-
-static inline unsigned int __attribute__((always_inline))
-__rte_ring_mc_do_dequeue(struct rte_ring *r, void **obj_table,
- unsigned n, enum rte_ring_queue_behavior behavior)
+static __rte_always_inline unsigned int
+__rte_ring_move_cons_head(struct rte_ring *r, int is_sc,
+ unsigned int n, enum rte_ring_queue_behavior behavior,
+ uint32_t *old_head, uint32_t *new_head,
+ uint32_t *entries)
{
- uint32_t cons_head, prod_tail;
- uint32_t cons_next, entries;
- const unsigned max = n;
+ unsigned int max = n;
int success;
- unsigned int i;
- uint32_t mask = r->mask;
-
- /* Avoid the unnecessary cmpset operation below, which is also
- * potentially harmful when n equals 0. */
- if (n == 0)
- return 0;
/* 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;
+ *old_head = r->cons.head;
+
+ /* add rmb barrier to avoid load/load reorder in weak
+ * memory model. It is noop on x86
+ */
+ rte_smp_rmb();
+
+ const uint32_t 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);
+ *entries = (prod_tail - *old_head);
/* Set the actual entries for dequeue */
- if (n > entries) {
- if (behavior == RTE_RING_QUEUE_FIXED)
- return 0;
- else {
- if (unlikely(entries == 0))
- return 0;
- n = entries;
- }
- }
-
- cons_next = cons_head + n;
- success = rte_atomic32_cmpset(&r->cons.head, cons_head,
- cons_next);
- } while (unlikely(success == 0));
+ if (n > *entries)
+ n = (behavior == RTE_RING_QUEUE_FIXED) ? 0 : *entries;
- /* copy in table */
- DEQUEUE_PTRS();
- rte_smp_rmb();
-
- /*
- * 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();
-
- r->cons.tail = cons_next;
+ if (unlikely(n == 0))
+ return 0;
+ *new_head = *old_head + n;
+ if (is_sc)
+ r->cons.head = *new_head, success = 1;
+ else
+ success = rte_atomic32_cmpset(&r->cons.head, *old_head,
+ *new_head);
+ } while (unlikely(success == 0));
return 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
+ * @internal Dequeue several objects from the ring
*
* @param r
* A pointer to the ring structure.
* @param obj_table
- * A pointer to a table of void * pointers (objects) that will be filled.
+ * A pointer to a table of void * pointers (objects).
* @param n
- * The number of objects to dequeue from the ring to the obj_table.
+ * The number of objects to pull from the ring.
* @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
+ * RTE_RING_QUEUE_VARIABLE: Dequeue as many items as possible from ring
+ * @param is_sc
+ * Indicates whether to use single consumer or multi-consumer head update
+ * @param available
+ * returns the number of remaining ring entries after the dequeue has finished
* @return
* - Actual number of objects dequeued.
* If behavior == RTE_RING_QUEUE_FIXED, this will be 0 or n only.
*/
-static inline unsigned int __attribute__((always_inline))
-__rte_ring_sc_do_dequeue(struct rte_ring *r, void **obj_table,
- unsigned n, enum rte_ring_queue_behavior behavior)
+static __rte_always_inline unsigned int
+__rte_ring_do_dequeue(struct rte_ring *r, void **obj_table,
+ unsigned int n, enum rte_ring_queue_behavior behavior,
+ int is_sc, unsigned int *available)
{
- uint32_t cons_head, prod_tail;
- uint32_t cons_next, entries;
- unsigned int i;
- uint32_t mask = r->mask;
-
- 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;
-
- if (n > entries) {
- if (behavior == RTE_RING_QUEUE_FIXED)
- return 0;
- else {
- if (unlikely(entries == 0))
- return 0;
- n = entries;
- }
- }
-
- cons_next = cons_head + n;
- r->cons.head = cons_next;
-
- /* copy in table */
- DEQUEUE_PTRS();
+ uint32_t cons_head, cons_next;
+ uint32_t entries;
+
+ n = __rte_ring_move_cons_head(r, is_sc, n, behavior,
+ &cons_head, &cons_next, &entries);
+ if (n == 0)
+ goto end;
+
+ DEQUEUE_PTRS(r, &r[1], cons_head, obj_table, n, void *);
rte_smp_rmb();
- r->cons.tail = cons_next;
+ update_tail(&r->cons, cons_head, cons_next, is_sc);
+
+end:
+ if (available != NULL)
+ *available = entries - n;
return n;
}
* @return
* The number of objects enqueued, either 0 or n
*/
-static inline unsigned int __attribute__((always_inline))
+static __rte_always_inline unsigned int
rte_ring_mp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
unsigned int n, unsigned int *free_space)
{
- return __rte_ring_mp_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
- free_space);
+ return __rte_ring_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+ __IS_MP, free_space);
}
/**
* @return
* The number of objects enqueued, either 0 or n
*/
-static inline unsigned int __attribute__((always_inline))
+static __rte_always_inline unsigned int
rte_ring_sp_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
unsigned int n, unsigned int *free_space)
{
- return __rte_ring_sp_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
- free_space);
+ return __rte_ring_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+ __IS_SP, free_space);
}
/**
* @return
* The number of objects enqueued, either 0 or n
*/
-static inline unsigned int __attribute__((always_inline))
+static __rte_always_inline unsigned int
rte_ring_enqueue_bulk(struct rte_ring *r, void * const *obj_table,
unsigned int n, unsigned int *free_space)
{
- if (r->prod.single)
- return rte_ring_sp_enqueue_bulk(r, obj_table, n, free_space);
- else
- return rte_ring_mp_enqueue_bulk(r, obj_table, n, free_space);
+ return __rte_ring_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+ r->prod.single, free_space);
}
/**
* - 0: Success; objects enqueued.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int __attribute__((always_inline))
+static __rte_always_inline int
rte_ring_mp_enqueue(struct rte_ring *r, void *obj)
{
return rte_ring_mp_enqueue_bulk(r, &obj, 1, NULL) ? 0 : -ENOBUFS;
* - 0: Success; objects enqueued.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int __attribute__((always_inline))
+static __rte_always_inline int
rte_ring_sp_enqueue(struct rte_ring *r, void *obj)
{
return rte_ring_sp_enqueue_bulk(r, &obj, 1, NULL) ? 0 : -ENOBUFS;
* - 0: Success; objects enqueued.
* - -ENOBUFS: Not enough room in the ring to enqueue; no object is enqueued.
*/
-static inline int __attribute__((always_inline))
+static __rte_always_inline int
rte_ring_enqueue(struct rte_ring *r, void *obj)
{
return rte_ring_enqueue_bulk(r, &obj, 1, NULL) ? 0 : -ENOBUFS;
* 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 available
+ * If non-NULL, returns the number of remaining ring entries after the
+ * dequeue has finished.
* @return
* The number of objects dequeued, either 0 or n
*/
-static inline unsigned int __attribute__((always_inline))
-rte_ring_mc_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned n)
+static __rte_always_inline unsigned int
+rte_ring_mc_dequeue_bulk(struct rte_ring *r, void **obj_table,
+ unsigned int n, unsigned int *available)
{
- return __rte_ring_mc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED);
+ return __rte_ring_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+ __IS_MC, available);
}
/**
* @param n
* The number of objects to dequeue from the ring to the obj_table,
* must be strictly positive.
+ * @param available
+ * If non-NULL, returns the number of remaining ring entries after the
+ * dequeue has finished.
* @return
* The number of objects dequeued, either 0 or n
*/
-static inline unsigned int __attribute__((always_inline))
-rte_ring_sc_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned n)
+static __rte_always_inline unsigned int
+rte_ring_sc_dequeue_bulk(struct rte_ring *r, void **obj_table,
+ unsigned int n, unsigned int *available)
{
- return __rte_ring_sc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED);
+ return __rte_ring_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+ __IS_SC, available);
}
/**
* 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 available
+ * If non-NULL, returns the number of remaining ring entries after the
+ * dequeue has finished.
* @return
* The number of objects dequeued, either 0 or n
*/
-static inline unsigned int __attribute__((always_inline))
-rte_ring_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned n)
+static __rte_always_inline unsigned int
+rte_ring_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned int n,
+ unsigned int *available)
{
- if (r->cons.single)
- return rte_ring_sc_dequeue_bulk(r, obj_table, n);
- else
- return rte_ring_mc_dequeue_bulk(r, obj_table, n);
+ return __rte_ring_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_FIXED,
+ r->cons.single, available);
}
/**
* - -ENOENT: Not enough entries in the ring to dequeue; no object is
* dequeued.
*/
-static inline int __attribute__((always_inline))
+static __rte_always_inline int
rte_ring_mc_dequeue(struct rte_ring *r, void **obj_p)
{
- return rte_ring_mc_dequeue_bulk(r, obj_p, 1) ? 0 : -ENOBUFS;
+ return rte_ring_mc_dequeue_bulk(r, obj_p, 1, NULL) ? 0 : -ENOENT;
}
/**
* - -ENOENT: Not enough entries in the ring to dequeue, no object is
* dequeued.
*/
-static inline int __attribute__((always_inline))
+static __rte_always_inline int
rte_ring_sc_dequeue(struct rte_ring *r, void **obj_p)
{
- return rte_ring_sc_dequeue_bulk(r, obj_p, 1) ? 0 : -ENOBUFS;
+ return rte_ring_sc_dequeue_bulk(r, obj_p, 1, NULL) ? 0 : -ENOENT;
}
/**
* - -ENOENT: Not enough entries in the ring to dequeue, no object is
* dequeued.
*/
-static inline int __attribute__((always_inline))
+static __rte_always_inline int
rte_ring_dequeue(struct rte_ring *r, void **obj_p)
{
- return rte_ring_dequeue_bulk(r, obj_p, 1) ? 0 : -ENOBUFS;
+ return rte_ring_dequeue_bulk(r, obj_p, 1, NULL) ? 0 : -ENOENT;
}
/**
- * Test if a ring is full.
+ * Return the number of entries in a ring.
*
* @param r
* A pointer to the ring structure.
* @return
- * - 1: The ring is full.
- * - 0: The ring is not full.
+ * The number of entries in the ring.
*/
-static inline int
-rte_ring_full(const struct rte_ring *r)
+static inline unsigned
+rte_ring_count(const struct rte_ring *r)
{
uint32_t prod_tail = r->prod.tail;
uint32_t cons_tail = r->cons.tail;
- return ((cons_tail - prod_tail - 1) & r->mask) == 0;
+ uint32_t count = (prod_tail - cons_tail) & r->mask;
+ return (count > r->capacity) ? r->capacity : count;
}
/**
- * Test if a ring is empty.
+ * Return the number of free entries in a ring.
*
* @param r
* A pointer to the ring structure.
* @return
- * - 1: The ring is empty.
- * - 0: The ring is not empty.
+ * The number of free entries in the ring.
*/
-static inline int
-rte_ring_empty(const struct rte_ring *r)
+static inline unsigned
+rte_ring_free_count(const struct rte_ring *r)
{
- uint32_t prod_tail = r->prod.tail;
- uint32_t cons_tail = r->cons.tail;
- return !!(cons_tail == prod_tail);
+ return r->capacity - rte_ring_count(r);
}
/**
- * Return the number of entries in a ring.
+ * Test if a ring is full.
*
* @param r
* A pointer to the ring structure.
* @return
- * The number of entries in the ring.
+ * - 1: The ring is full.
+ * - 0: The ring is not full.
*/
-static inline unsigned
-rte_ring_count(const struct rte_ring *r)
+static inline int
+rte_ring_full(const struct rte_ring *r)
{
- uint32_t prod_tail = r->prod.tail;
- uint32_t cons_tail = r->cons.tail;
- return (prod_tail - cons_tail) & r->mask;
+ return rte_ring_free_count(r) == 0;
}
/**
- * Return the number of free entries in a ring.
+ * Test if a ring is empty.
*
* @param r
* A pointer to the ring structure.
* @return
- * The number of free entries in the ring.
+ * - 1: The ring is empty.
+ * - 0: The ring is not empty.
*/
-static inline unsigned
-rte_ring_free_count(const struct rte_ring *r)
+static inline int
+rte_ring_empty(const struct rte_ring *r)
{
- uint32_t prod_tail = r->prod.tail;
- uint32_t cons_tail = r->cons.tail;
- return (cons_tail - prod_tail - 1) & r->mask;
+ return rte_ring_count(r) == 0;
}
/**
* @param r
* A pointer to the ring structure.
* @return
- * The number of elements which can be stored in the ring.
+ * The size of the data store used by the ring.
+ * NOTE: this is not the same as the usable space in the ring. To query that
+ * use ``rte_ring_get_capacity()``.
*/
static inline unsigned int
rte_ring_get_size(const struct rte_ring *r)
return r->size;
}
+/**
+ * Return the number of elements which can be stored in the ring.
+ *
+ * @param r
+ * A pointer to the ring structure.
+ * @return
+ * The usable size of the ring.
+ */
+static inline unsigned int
+rte_ring_get_capacity(const struct rte_ring *r)
+{
+ return r->capacity;
+}
+
/**
* Dump the status of all rings on the console
*
* @return
* - n: Actual number of objects enqueued.
*/
-static inline unsigned __attribute__((always_inline))
+static __rte_always_inline unsigned
rte_ring_mp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
unsigned int n, unsigned int *free_space)
{
- return __rte_ring_mp_do_enqueue(r, obj_table, n,
- RTE_RING_QUEUE_VARIABLE, free_space);
+ return __rte_ring_do_enqueue(r, obj_table, n,
+ RTE_RING_QUEUE_VARIABLE, __IS_MP, free_space);
}
/**
* @return
* - n: Actual number of objects enqueued.
*/
-static inline unsigned __attribute__((always_inline))
+static __rte_always_inline unsigned
rte_ring_sp_enqueue_burst(struct rte_ring *r, void * const *obj_table,
unsigned int n, unsigned int *free_space)
{
- return __rte_ring_sp_do_enqueue(r, obj_table, n,
- RTE_RING_QUEUE_VARIABLE, free_space);
+ return __rte_ring_do_enqueue(r, obj_table, n,
+ RTE_RING_QUEUE_VARIABLE, __IS_SP, free_space);
}
/**
* @return
* - n: Actual number of objects enqueued.
*/
-static inline unsigned __attribute__((always_inline))
+static __rte_always_inline unsigned
rte_ring_enqueue_burst(struct rte_ring *r, void * const *obj_table,
unsigned int n, unsigned int *free_space)
{
- if (r->prod.single)
- return rte_ring_sp_enqueue_burst(r, obj_table, n, free_space);
- else
- return rte_ring_mp_enqueue_burst(r, obj_table, n, free_space);
+ return __rte_ring_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE,
+ r->prod.single, free_space);
}
/**
* 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 available
+ * If non-NULL, returns the number of remaining ring entries after the
+ * dequeue has finished.
* @return
* - n: Actual number of objects dequeued, 0 if ring is empty
*/
-static inline unsigned __attribute__((always_inline))
-rte_ring_mc_dequeue_burst(struct rte_ring *r, void **obj_table, unsigned n)
+static __rte_always_inline unsigned
+rte_ring_mc_dequeue_burst(struct rte_ring *r, void **obj_table,
+ unsigned int n, unsigned int *available)
{
- return __rte_ring_mc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE);
+ return __rte_ring_do_dequeue(r, obj_table, n,
+ RTE_RING_QUEUE_VARIABLE, __IS_MC, available);
}
/**
* 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 available
+ * If non-NULL, returns the number of remaining ring entries after the
+ * dequeue has finished.
* @return
* - n: Actual number of objects dequeued, 0 if ring is empty
*/
-static inline unsigned __attribute__((always_inline))
-rte_ring_sc_dequeue_burst(struct rte_ring *r, void **obj_table, unsigned n)
+static __rte_always_inline unsigned
+rte_ring_sc_dequeue_burst(struct rte_ring *r, void **obj_table,
+ unsigned int n, unsigned int *available)
{
- return __rte_ring_sc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE);
+ return __rte_ring_do_dequeue(r, obj_table, n,
+ RTE_RING_QUEUE_VARIABLE, __IS_SC, available);
}
/**
* 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 available
+ * If non-NULL, returns the number of remaining ring entries after the
+ * dequeue has finished.
* @return
* - Number of objects dequeued
*/
-static inline unsigned __attribute__((always_inline))
-rte_ring_dequeue_burst(struct rte_ring *r, void **obj_table, unsigned n)
+static __rte_always_inline unsigned
+rte_ring_dequeue_burst(struct rte_ring *r, void **obj_table,
+ unsigned int n, unsigned int *available)
{
- if (r->cons.single)
- return rte_ring_sc_dequeue_burst(r, obj_table, n);
- else
- return rte_ring_mc_dequeue_burst(r, obj_table, n);
+ return __rte_ring_do_dequeue(r, obj_table, n,
+ RTE_RING_QUEUE_VARIABLE,
+ r->cons.single, available);
}
#ifdef __cplusplus
git.droids-corp.org / dpdk.git / blobdiff