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Diffstat (limited to 'src/dpdk22/lib/librte_ring/rte_ring.h')
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diff --git a/src/dpdk22/lib/librte_ring/rte_ring.h b/src/dpdk22/lib/librte_ring/rte_ring.h deleted file mode 100644 index de036cef..00000000 --- a/src/dpdk22/lib/librte_ring/rte_ring.h +++ /dev/null @@ -1,1251 +0,0 @@ -/*- - * BSD LICENSE - * - * 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 - * are met: - * - * * 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 - * distribution. - * * 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 - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -/* - * Derived from FreeBSD's bufring.h - * - ************************************************************************** - * - * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * 2. The name of Kip Macy nor the names of other - * 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 OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ***************************************************************************/ - -#ifndef _RTE_RING_H_ -#define _RTE_RING_H_ - -/** - * @file - * RTE Ring - * - * The Ring Manager is a fixed-size queue, implemented as a table of - * pointers. Head and tail pointers are modified atomically, allowing - * concurrent access to it. It has the following features: - * - * - FIFO (First In First Out) - * - Maximum size is fixed; the pointers are stored in a table. - * - Lockless implementation. - * - Multi- or single-consumer dequeue. - * - Multi- or single-producer enqueue. - * - Bulk dequeue. - * - Bulk enqueue. - * - * Note: the ring implementation is not preemptable. A lcore must not - * be interrupted by another task that uses the same ring. - * - */ - -#ifdef __cplusplus -extern "C" { -#endif - -#include <stdio.h> -#include <stdint.h> -#include <sys/queue.h> -#include <errno.h> -#include <rte_common.h> -#include <rte_memory.h> -#include <rte_lcore.h> -#include <rte_atomic.h> -#include <rte_branch_prediction.h> - -#define RTE_TAILQ_RING_NAME "RTE_RING" - -enum rte_ring_queue_behavior { - RTE_RING_QUEUE_FIXED = 0, /* Enq/Deq a fixed number of items from a ring */ - RTE_RING_QUEUE_VARIABLE /* Enq/Deq as many items a possible from ring */ -}; - -#ifdef RTE_LIBRTE_RING_DEBUG -/** - * A structure that stores the ring statistics (per-lcore). - */ -struct rte_ring_debug_stats { - uint64_t enq_success_bulk; /**< Successful enqueues number. */ - uint64_t enq_success_objs; /**< Objects successfully enqueued. */ - uint64_t enq_quota_bulk; /**< Successful enqueues above watermark. */ - uint64_t enq_quota_objs; /**< Objects enqueued above watermark. */ - uint64_t enq_fail_bulk; /**< Failed enqueues number. */ - uint64_t enq_fail_objs; /**< Objects that failed to be enqueued. */ - uint64_t deq_success_bulk; /**< Successful dequeues number. */ - uint64_t deq_success_objs; /**< Objects successfully dequeued. */ - uint64_t deq_fail_bulk; /**< Failed dequeues number. */ - uint64_t deq_fail_objs; /**< Objects that failed to be dequeued. */ -} __rte_cache_aligned; -#endif - -#define RTE_RING_NAMESIZE 32 /**< The maximum length of a ring name. */ -#define RTE_RING_MZ_PREFIX "RG_" - -#ifndef RTE_RING_PAUSE_REP_COUNT -#define RTE_RING_PAUSE_REP_COUNT 0 /**< Yield after pause num of times, no yield - * if RTE_RING_PAUSE_REP not defined. */ -#endif - -struct rte_memzone; /* forward declaration, so as not to require memzone.h */ - -/** - * An RTE ring structure. - * - * The producer and the consumer have a head and a tail index. The particularity - * of these index is that they are not between 0 and size(ring). These indexes - * are between 0 and 2^32, and we mask their value when we access the ring[] - * field. Thanks to this assumption, we can do subtractions between 2 index - * values in a modulo-32bit base: that's why the overflow of the indexes is not - * a problem. - */ -struct rte_ring { - char name[RTE_RING_NAMESIZE]; /**< Name of the ring. */ - int flags; /**< Flags supplied at creation. */ - const struct rte_memzone *memzone; - /**< Memzone, if any, containing the rte_ring */ - - /** Ring producer status. */ - struct prod { - uint32_t watermark; /**< Maximum items before EDQUOT. */ - uint32_t sp_enqueue; /**< True, if single producer. */ - uint32_t size; /**< Size of ring. */ - uint32_t mask; /**< Mask (size-1) of ring. */ - volatile uint32_t head; /**< Producer head. */ - volatile uint32_t tail; /**< Producer tail. */ - } prod __rte_cache_aligned; - - /** Ring consumer status. */ - struct cons { - uint32_t sc_dequeue; /**< True, if single consumer. */ - uint32_t size; /**< Size of the ring. */ - 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 * 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_F_SC_DEQ 0x0002 /**< The default dequeue is "single-consumer". */ -#define RTE_RING_QUOT_EXCEED (1 << 31) /**< Quota exceed for burst ops */ -#define RTE_RING_SZ_MASK (unsigned)(0x0fffffff) /**< Ring size mask */ - -/** - * @internal When debug is enabled, store ring statistics. - * @param r - * A pointer to the ring. - * @param name - * The name of the statistics field to increment in the ring. - * @param n - * The number to add to the object-oriented statistics. - */ -#ifdef RTE_LIBRTE_RING_DEBUG -#define __RING_STAT_ADD(r, name, n) do { \ - unsigned __lcore_id = rte_lcore_id(); \ - if (__lcore_id < RTE_MAX_LCORE) { \ - r->stats[__lcore_id].name##_objs += n; \ - r->stats[__lcore_id].name##_bulk += 1; \ - } \ - } while(0) -#else -#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. 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. - * @param count - * The size of the ring (must be a power of 2). - * @param socket_id - * The *socket_id* argument is the socket identifier in case of - * NUMA. The value can be *SOCKET_ID_ANY* if there is no NUMA - * constraint for the reserved zone. - * @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 - * On success, the pointer to the new allocated ring. NULL on error with - * rte_errno set appropriately. Possible errno values include: - * - E_RTE_NO_CONFIG - function could not get pointer to rte_config structure - * - E_RTE_SECONDARY - function was called from a secondary process instance - * - EINVAL - count provided is not a power of 2 - * - ENOSPC - the maximum number of memzones has already been allocated - * - EEXIST - a memzone with the same name already exists - * - ENOMEM - no appropriate memory area found in which to create memzone - */ -struct rte_ring *rte_ring_create(const char *name, unsigned count, - int socket_id, unsigned flags); -/** - * De-allocate all memory used by the ring. - * - * @param r - * Ring to free - */ -void rte_ring_free(struct rte_ring *r); - -/** - * Change the high water mark. - * - * If *count* is 0, water marking is disabled. Otherwise, it is set to the - * *count* value. The *count* value must be greater than 0 and less - * than the ring size. - * - * This function can be called at any time (not necessarily at - * initialization). - * - * @param r - * A pointer to the ring structure. - * @param count - * The new water mark value. - * @return - * - 0: Success; water mark changed. - * - -EINVAL: Invalid water mark value. - */ -int rte_ring_set_water_mark(struct rte_ring *r, unsigned count); - -/** - * 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(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). - * - * This function uses a "compare and set" instruction to move the - * producer index atomically. - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * 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_mp_do_enqueue(struct rte_ring *r, void * const *obj_table, - unsigned n, enum rte_ring_queue_behavior behavior) -{ - uint32_t prod_head, prod_next; - uint32_t cons_tail, free_entries; - const unsigned max = n; - int success; - unsigned i, rep = 0; - uint32_t mask = r->prod.mask; - int ret; - - /* 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 - * (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; - success = rte_atomic32_cmpset(&r->prod.head, prod_head, - prod_next); - } while (unlikely(success == 0)); - - /* write entries in ring */ - ENQUEUE_PTRS(); - rte_smp_wmb(); - - /* 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); - } - - /* - * 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(); - - /* Set RTE_RING_PAUSE_REP_COUNT to avoid spin too long waiting - * for other thread finish. It gives pre-empted thread a chance - * to proceed and finish with ring dequeue operation. */ - if (RTE_RING_PAUSE_REP_COUNT && - ++rep == RTE_RING_PAUSE_REP_COUNT) { - rep = 0; - sched_yield(); - } - } - r->prod.tail = prod_next; - return ret; -} - -/** - * @internal Enqueue several objects on a ring (NOT multi-producers safe). - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * 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_smp_wmb(); - - /* 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, rep = 0; - 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_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(); - - /* Set RTE_RING_PAUSE_REP_COUNT to avoid spin too long waiting - * for other thread finish. It gives pre-empted thread a chance - * to proceed and finish with ring dequeue operation. */ - if (RTE_RING_PAUSE_REP_COUNT && - ++rep == RTE_RING_PAUSE_REP_COUNT) { - rep = 0; - sched_yield(); - } - } - __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. - * @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_sc_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; - unsigned i; - uint32_t mask = r->prod.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) { - __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; - r->cons.head = cons_next; - - /* copy in table */ - DEQUEUE_PTRS(); - rte_smp_rmb(); - - __RING_STAT_ADD(r, deq_success, n); - r->cons.tail = cons_next; - return behavior == RTE_RING_QUEUE_FIXED ? 0 : n; -} - -/** - * Enqueue several objects on the ring (multi-producers safe). - * - * This function uses a "compare and set" instruction to move the - * producer index atomically. - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * The number of objects to add in the ring from the obj_table. - * @return - * - 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. - */ -static inline int __attribute__((always_inline)) -rte_ring_mp_enqueue_bulk(struct rte_ring *r, void * const *obj_table, - unsigned n) -{ - return __rte_ring_mp_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED); -} - -/** - * Enqueue several objects on a ring (NOT multi-producers safe). - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * The number of objects to add in the ring from the obj_table. - * @return - * - 0: Success; objects enqueued. - * - -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. - */ -static inline int __attribute__((always_inline)) -rte_ring_sp_enqueue_bulk(struct rte_ring *r, void * const *obj_table, - unsigned n) -{ - return __rte_ring_sp_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_FIXED); -} - -/** - * Enqueue several objects on a ring. - * - * This function calls the multi-producer or the single-producer - * version depending on the default behavior that was specified at - * ring creation time (see flags). - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * The number of objects to add in the ring from the obj_table. - * @return - * - 0: Success; objects enqueued. - * - -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. - */ -static inline int __attribute__((always_inline)) -rte_ring_enqueue_bulk(struct rte_ring *r, void * const *obj_table, - unsigned n) -{ - if (r->prod.sp_enqueue) - return rte_ring_sp_enqueue_bulk(r, obj_table, n); - else - return rte_ring_mp_enqueue_bulk(r, obj_table, n); -} - -/** - * Enqueue one object on a ring (multi-producers safe). - * - * This function uses a "compare and set" instruction to move the - * producer index atomically. - * - * @param r - * A pointer to the ring structure. - * @param obj - * A pointer to the object to be added. - * @return - * - 0: Success; objects enqueued. - * - -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. - */ -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); -} - -/** - * Enqueue one object on a ring (NOT multi-producers safe). - * - * @param r - * A pointer to the ring structure. - * @param obj - * A pointer to the object to be added. - * @return - * - 0: Success; objects enqueued. - * - -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. - */ -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); -} - -/** - * Enqueue one object on a ring. - * - * This function calls the multi-producer or the single-producer - * version, depending on the default behaviour that was specified at - * ring creation time (see flags). - * - * @param r - * A pointer to the ring structure. - * @param obj - * A pointer to the object to be added. - * @return - * - 0: Success; objects enqueued. - * - -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. - */ -static inline int __attribute__((always_inline)) -rte_ring_enqueue(struct rte_ring *r, void *obj) -{ - if (r->prod.sp_enqueue) - return rte_ring_sp_enqueue(r, obj); - else - return rte_ring_mp_enqueue(r, obj); -} - -/** - * Dequeue several objects from a ring (multi-consumers safe). - * - * 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. - * @return - * - 0: Success; objects dequeued. - * - -ENOENT: Not enough entries in the ring to dequeue; no object is - * dequeued. - */ -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); -} - -/** - * Dequeue several objects from a ring (NOT multi-consumers safe). - * - * @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, - * must be strictly positive. - * @return - * - 0: Success; objects dequeued. - * - -ENOENT: Not enough entries in the ring to dequeue; no object is - * dequeued. - */ -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); -} - -/** - * Dequeue several objects from a ring. - * - * This function calls the multi-consumers or the single-consumer - * version, depending on the default behaviour that was specified at - * ring creation time (see flags). - * - * @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. - * @return - * - 0: Success; objects dequeued. - * - -ENOENT: Not enough entries in the ring to dequeue, no object is - * dequeued. - */ -static inline int __attribute__((always_inline)) -rte_ring_dequeue_bulk(struct rte_ring *r, void **obj_table, unsigned n) -{ - if (r->cons.sc_dequeue) - return rte_ring_sc_dequeue_bulk(r, obj_table, n); - else - return rte_ring_mc_dequeue_bulk(r, obj_table, n); -} - -/** - * Dequeue one object from a ring (multi-consumers safe). - * - * This function uses a "compare and set" instruction to move the - * consumer index atomically. - * - * @param r - * A pointer to the ring structure. - * @param obj_p - * A pointer to a void * pointer (object) that will be filled. - * @return - * - 0: Success; objects dequeued. - * - -ENOENT: Not enough entries in the ring to dequeue; no object is - * dequeued. - */ -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); -} - -/** - * Dequeue one object from a ring (NOT multi-consumers safe). - * - * @param r - * A pointer to the ring structure. - * @param obj_p - * A pointer to a void * pointer (object) that will be filled. - * @return - * - 0: Success; objects dequeued. - * - -ENOENT: Not enough entries in the ring to dequeue, no object is - * dequeued. - */ -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); -} - -/** - * Dequeue one object from a ring. - * - * This function calls the multi-consumers or the single-consumer - * version depending on the default behaviour that was specified at - * ring creation time (see flags). - * - * @param r - * A pointer to the ring structure. - * @param obj_p - * A pointer to a void * pointer (object) that will be filled. - * @return - * - 0: Success, objects dequeued. - * - -ENOENT: Not enough entries in the ring to dequeue, no object is - * dequeued. - */ -static inline int __attribute__((always_inline)) -rte_ring_dequeue(struct rte_ring *r, void **obj_p) -{ - if (r->cons.sc_dequeue) - return rte_ring_sc_dequeue(r, obj_p); - else - return rte_ring_mc_dequeue(r, obj_p); -} - -/** - * Test if a ring is full. - * - * @param r - * A pointer to the ring structure. - * @return - * - 1: The ring is full. - * - 0: The ring is not full. - */ -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 (((cons_tail - prod_tail - 1) & r->prod.mask) == 0); -} - -/** - * Test if a ring is empty. - * - * @param r - * A pointer to the ring structure. - * @return - * - 1: The ring is empty. - * - 0: The ring is not empty. - */ -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); -} - -/** - * Return the number of entries in a ring. - * - * @param r - * A pointer to the ring structure. - * @return - * The number of entries in the ring. - */ -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 ((prod_tail - cons_tail) & r->prod.mask); -} - -/** - * Return the number of free entries in a ring. - * - * @param r - * A pointer to the ring structure. - * @return - * The number of free entries in the ring. - */ -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 - 1) & r->prod.mask); -} - -/** - * Dump the status of all rings on the console - * - * @param f - * A pointer to a file for output - */ -void rte_ring_list_dump(FILE *f); - -/** - * Search a ring from its name - * - * @param name - * The name of the ring. - * @return - * The pointer to the ring matching the name, or NULL if not found, - * with rte_errno set appropriately. Possible rte_errno values include: - * - ENOENT - required entry not available to return. - */ -struct rte_ring *rte_ring_lookup(const char *name); - -/** - * Enqueue several objects on the ring (multi-producers safe). - * - * This function uses a "compare and set" instruction to move the - * producer index atomically. - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * The number of objects to add in the ring from the obj_table. - * @return - * - n: Actual number of objects enqueued. - */ -static inline unsigned __attribute__((always_inline)) -rte_ring_mp_enqueue_burst(struct rte_ring *r, void * const *obj_table, - unsigned n) -{ - return __rte_ring_mp_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE); -} - -/** - * Enqueue several objects on a ring (NOT multi-producers safe). - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * The number of objects to add in the ring from the obj_table. - * @return - * - n: Actual number of objects enqueued. - */ -static inline unsigned __attribute__((always_inline)) -rte_ring_sp_enqueue_burst(struct rte_ring *r, void * const *obj_table, - unsigned n) -{ - return __rte_ring_sp_do_enqueue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE); -} - -/** - * Enqueue several objects on a ring. - * - * This function calls the multi-producer or the single-producer - * version depending on the default behavior that was specified at - * ring creation time (see flags). - * - * @param r - * A pointer to the ring structure. - * @param obj_table - * A pointer to a table of void * pointers (objects). - * @param n - * The number of objects to add in the ring from the obj_table. - * @return - * - n: Actual number of objects enqueued. - */ -static inline unsigned __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); - else - return rte_ring_mp_enqueue_burst(r, obj_table, n); -} - -/** - * 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. - * @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) -{ - return __rte_ring_mc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE); -} - -/** - * 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. - * @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) -{ - return __rte_ring_sc_do_dequeue(r, obj_table, n, RTE_RING_QUEUE_VARIABLE); -} - -/** - * Dequeue multiple objects from a ring up to a maximum number. - * - * This function calls the multi-consumers or the single-consumer - * version, depending on the default behaviour that was specified at - * ring creation time (see flags). - * - * @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. - * @return - * - Number of objects dequeued - */ -static inline unsigned __attribute__((always_inline)) -rte_ring_dequeue_burst(struct rte_ring *r, void **obj_table, unsigned n) -{ - if (r->cons.sc_dequeue) - return rte_ring_sc_dequeue_burst(r, obj_table, n); - else - return rte_ring_mc_dequeue_burst(r, obj_table, n); -} - -#ifdef __cplusplus -} -#endif - -#endif /* _RTE_RING_H_ */ |