From patchwork Wed Jun 1 16:19:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Hunt, David" X-Patchwork-Id: 13146 Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [IPv6:::1]) by dpdk.org (Postfix) with ESMTP id 062546968; Wed, 1 Jun 2016 18:20:09 +0200 (CEST) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id C103F6966 for ; Wed, 1 Jun 2016 18:20:07 +0200 (CEST) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP; 01 Jun 2016 09:20:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,401,1459839600"; d="scan'208";a="966791719" Received: from sie-lab-214-251.ir.intel.com (HELO silpixa373510.ir.intel.com) ([10.237.214.251]) by orsmga001.jf.intel.com with ESMTP; 01 Jun 2016 09:20:03 -0700 From: David Hunt To: dev@dpdk.org Cc: olivier.matz@6wind.com, viktorin@rehivetech.com, jerin.jacob@caviumnetworks.com, David Hunt Date: Wed, 1 Jun 2016 17:19:54 +0100 Message-Id: <1464797998-76690-2-git-send-email-david.hunt@intel.com> X-Mailer: git-send-email 2.5.5 In-Reply-To: <1464797998-76690-1-git-send-email-david.hunt@intel.com> References: <1463665501-18325-1-git-send-email-david.hunt@intel.com> <1464797998-76690-1-git-send-email-david.hunt@intel.com> Subject: [dpdk-dev] [PATCH v6 1/5] mempool: support external handler X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Until now, the objects stored in a mempool were internally stored in a ring. This patch introduces the possibility to register external handlers replacing the ring. The default behavior remains unchanged, but calling the new function rte_mempool_set_handler() right after rte_mempool_create_empty() allows the user to change the handler that will be used when populating the mempool. v7 changes: * Moved the flags handling from rte_mempool_create_empty to rte_mempool_create, as it's only there for backward compatibility * Various comment additions and cleanup * Renamed rte_mempool_handler to rte_mempool_ops * Added a union for *pool and u64 pool_id in struct rte_mempool v6 changes: * split the original patch into a few parts for easier review. * rename functions with _ext_ to _ops_. * addressed some review comments * renamed put and get functions to enqueue and dequeue * renamed rte_mempool_handler struct to rte_mempool_handler_ops * changed occurences of rte_mempool_handler_ops to const, as they contain function pointers (security) * added some extra comments v5 changes: rebasing on top of 35 patch set mempool work. Signed-off-by: Olivier Matz Signed-off-by: David Hunt --- lib/librte_mempool/Makefile | 1 + lib/librte_mempool/rte_mempool.c | 71 ++++------ lib/librte_mempool/rte_mempool.h | 235 ++++++++++++++++++++++++++++--- lib/librte_mempool/rte_mempool_handler.c | 141 +++++++++++++++++++ 4 files changed, 384 insertions(+), 64 deletions(-) create mode 100644 lib/librte_mempool/rte_mempool_handler.c diff --git a/lib/librte_mempool/Makefile b/lib/librte_mempool/Makefile index 43423e0..793745f 100644 --- a/lib/librte_mempool/Makefile +++ b/lib/librte_mempool/Makefile @@ -42,6 +42,7 @@ LIBABIVER := 2 # all source are stored in SRCS-y SRCS-$(CONFIG_RTE_LIBRTE_MEMPOOL) += rte_mempool.c +SRCS-$(CONFIG_RTE_LIBRTE_MEMPOOL) += rte_mempool_handler.c # install includes SYMLINK-$(CONFIG_RTE_LIBRTE_MEMPOOL)-include := rte_mempool.h diff --git a/lib/librte_mempool/rte_mempool.c b/lib/librte_mempool/rte_mempool.c index b54de43..9f34d30 100644 --- a/lib/librte_mempool/rte_mempool.c +++ b/lib/librte_mempool/rte_mempool.c @@ -148,7 +148,7 @@ mempool_add_elem(struct rte_mempool *mp, void *obj, phys_addr_t physaddr) #endif /* enqueue in ring */ - rte_ring_sp_enqueue(mp->ring, obj); + rte_mempool_ops_enqueue_bulk(mp, &obj, 1); } /* call obj_cb() for each mempool element */ @@ -303,40 +303,6 @@ rte_mempool_xmem_usage(__rte_unused void *vaddr, uint32_t elt_num, return (size_t)paddr_idx << pg_shift; } -/* create the internal ring */ -static int -rte_mempool_ring_create(struct rte_mempool *mp) -{ - int rg_flags = 0, ret; - char rg_name[RTE_RING_NAMESIZE]; - struct rte_ring *r; - - ret = snprintf(rg_name, sizeof(rg_name), - RTE_MEMPOOL_MZ_FORMAT, mp->name); - if (ret < 0 || ret >= (int)sizeof(rg_name)) - return -ENAMETOOLONG; - - /* ring flags */ - if (mp->flags & MEMPOOL_F_SP_PUT) - rg_flags |= RING_F_SP_ENQ; - if (mp->flags & MEMPOOL_F_SC_GET) - rg_flags |= RING_F_SC_DEQ; - - /* Allocate the ring that will be used to store objects. - * Ring functions will return appropriate errors if we are - * running as a secondary process etc., so no checks made - * in this function for that condition. - */ - r = rte_ring_create(rg_name, rte_align32pow2(mp->size + 1), - mp->socket_id, rg_flags); - if (r == NULL) - return -rte_errno; - - mp->ring = r; - mp->flags |= MEMPOOL_F_RING_CREATED; - return 0; -} - /* free a memchunk allocated with rte_memzone_reserve() */ static void rte_mempool_memchunk_mz_free(__rte_unused struct rte_mempool_memhdr *memhdr, @@ -354,7 +320,7 @@ rte_mempool_free_memchunks(struct rte_mempool *mp) void *elt; while (!STAILQ_EMPTY(&mp->elt_list)) { - rte_ring_sc_dequeue(mp->ring, &elt); + rte_mempool_ops_dequeue_bulk(mp, &elt, 1); (void)elt; STAILQ_REMOVE_HEAD(&mp->elt_list, next); mp->populated_size--; @@ -383,13 +349,16 @@ rte_mempool_populate_phys(struct rte_mempool *mp, char *vaddr, unsigned i = 0; size_t off; struct rte_mempool_memhdr *memhdr; - int ret; /* create the internal ring if not already done */ if ((mp->flags & MEMPOOL_F_RING_CREATED) == 0) { - ret = rte_mempool_ring_create(mp); - if (ret < 0) - return ret; + rte_errno = 0; + mp->pool = rte_mempool_ops_alloc(mp); + if (mp->pool == NULL) { + if (rte_errno == 0) + return -EINVAL; + return -rte_errno; + } } /* mempool is already populated */ @@ -703,7 +672,7 @@ rte_mempool_free(struct rte_mempool *mp) rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK); rte_mempool_free_memchunks(mp); - rte_ring_free(mp->ring); + rte_mempool_ops_free(mp); rte_memzone_free(mp->mz); } @@ -815,6 +784,20 @@ rte_mempool_create_empty(const char *name, unsigned n, unsigned elt_size, RTE_PTR_ADD(mp, MEMPOOL_HEADER_SIZE(mp, 0)); te->data = mp; + + /* + * Since we have 4 combinations of the SP/SC/MP/MC examine the flags to + * set the correct index into the handler table. + */ + if (flags & (MEMPOOL_F_SP_PUT | MEMPOOL_F_SC_GET)) + rte_mempool_set_handler(mp, "ring_sp_sc"); + else if (flags & MEMPOOL_F_SP_PUT) + rte_mempool_set_handler(mp, "ring_sp_mc"); + else if (flags & MEMPOOL_F_SC_GET) + rte_mempool_set_handler(mp, "ring_mp_sc"); + else + rte_mempool_set_handler(mp, "ring_mp_mc"); + rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK); TAILQ_INSERT_TAIL(mempool_list, te, next); rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK); @@ -930,7 +913,7 @@ rte_mempool_count(const struct rte_mempool *mp) unsigned count; unsigned lcore_id; - count = rte_ring_count(mp->ring); + count = rte_mempool_ops_get_count(mp); if (mp->cache_size == 0) return count; @@ -1123,7 +1106,7 @@ rte_mempool_dump(FILE *f, struct rte_mempool *mp) fprintf(f, "mempool <%s>@%p\n", mp->name, mp); fprintf(f, " flags=%x\n", mp->flags); - fprintf(f, " ring=<%s>@%p\n", mp->ring->name, mp->ring); + fprintf(f, " pool=%p\n", mp->pool); fprintf(f, " phys_addr=0x%" PRIx64 "\n", mp->mz->phys_addr); fprintf(f, " nb_mem_chunks=%u\n", mp->nb_mem_chunks); fprintf(f, " size=%"PRIu32"\n", mp->size); @@ -1144,7 +1127,7 @@ rte_mempool_dump(FILE *f, struct rte_mempool *mp) } cache_count = rte_mempool_dump_cache(f, mp); - common_count = rte_ring_count(mp->ring); + common_count = rte_mempool_ops_get_count(mp); if ((cache_count + common_count) > mp->size) common_count = mp->size - cache_count; fprintf(f, " common_pool_count=%u\n", common_count); diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h index 60339bd..b659565 100644 --- a/lib/librte_mempool/rte_mempool.h +++ b/lib/librte_mempool/rte_mempool.h @@ -67,6 +67,7 @@ #include #include +#include #include #include #include @@ -204,9 +205,13 @@ struct rte_mempool_memhdr { struct rte_mempool { char name[RTE_MEMPOOL_NAMESIZE]; /**< Name of mempool. */ struct rte_ring *ring; /**< Ring to store objects. */ + union { + void *pool; /**< Ring or pool to store objects */ + uint64_t *pool_id; /**< External mempool identifier */ + }; const struct rte_memzone *mz; /**< Memzone where pool is allocated */ int flags; /**< Flags of the mempool. */ - int socket_id; /**< Socket id passed at mempool creation. */ + int socket_id; /**< Socket id passed at create */ uint32_t size; /**< Max size of the mempool. */ uint32_t cache_size; /**< Size of per-lcore local cache. */ uint32_t cache_flushthresh; @@ -217,6 +222,14 @@ struct rte_mempool { uint32_t trailer_size; /**< Size of trailer (after elt). */ unsigned private_data_size; /**< Size of private data. */ + /** + * Index into rte_mempool_handler_table array of mempool handler ops + * structs, which contain callback function pointers. + * We're using an index here rather than pointers to the callbacks + * to facilitate any secondary processes that may want to use + * this mempool. + */ + int32_t handler_idx; struct rte_mempool_cache *local_cache; /**< Per-lcore local cache */ @@ -325,6 +338,199 @@ void rte_mempool_check_cookies(const struct rte_mempool *mp, #define __mempool_check_cookies(mp, obj_table_const, n, free) do {} while(0) #endif /* RTE_LIBRTE_MEMPOOL_DEBUG */ +#define RTE_MEMPOOL_HANDLER_NAMESIZE 32 /**< Max length of handler name. */ + +/** + * typedef for allocating the external pool. + * The handler's alloc function does whatever it needs to do to grab memory + * for this handler, and sets the *pool opaque pointer in the rte_mempool + * struct. In the default handler, *pool points to a ring,in other handlers, + * it will mostlikely point to a different type of data structure. + * It will be transparent to the application programmer. + */ +typedef void *(*rte_mempool_alloc_t)(struct rte_mempool *mp); + +/** Free the external pool opaque data (that pointed to by *pool) */ +typedef void (*rte_mempool_free_t)(void *p); + +/** + * Put an object in the external pool. + * The *p pointer is the opaque data for a given mempool handler (ring, + * array, linked list, etc) + */ +typedef int (*rte_mempool_put_t)(void *p, void * const *obj_table, unsigned n); + +/** Get an object from the external pool. */ +typedef int (*rte_mempool_get_t)(void *p, void **obj_table, unsigned n); + +/** Return the number of available objects in the external pool. */ +typedef unsigned (*rte_mempool_get_count)(void *p); + +/** Structure defining a mempool handler. */ +struct rte_mempool_ops { + char name[RTE_MEMPOOL_HANDLER_NAMESIZE]; /**< Name of mempool handler */ + rte_mempool_alloc_t alloc; /**< Allocate the external pool. */ + rte_mempool_free_t free; /**< Free the external pool. */ + rte_mempool_put_t put; /**< Put an object. */ + rte_mempool_get_t get; /**< Get an object. */ + rte_mempool_get_count get_count; /**< Get the number of available objs. */ +} __rte_cache_aligned; + +#define RTE_MEMPOOL_MAX_HANDLER_IDX 16 /**< Max registered handlers */ + +/** + * Structure storing the table of registered handlers, each of which contain + * the function pointers for the mempool handler functions. + * Each process has it's own storage for this handler struct aray so that + * the mempools can be shared across primary and secondary processes. + * The indices used to access the array are valid across processes, whereas + * any function pointers stored directly in the mempool struct would not be. + * This results in us simply having "handler_idx" in the mempool struct. + */ +struct rte_mempool_handler_table { + rte_spinlock_t sl; /**< Spinlock for add/delete. */ + uint32_t num_handlers; /**< Number of handlers in the table. */ + /** + * Storage for all possible handlers. + */ + struct rte_mempool_ops handler_ops[RTE_MEMPOOL_MAX_HANDLER_IDX]; +} __rte_cache_aligned; + +/** Array of registered handlers */ +extern struct rte_mempool_handler_table rte_mempool_handler_table; + +/** + * @internal Get the mempool handler from its index. + * + * @param handler_idx + * The index of the handler in the handler table. It must be a valid + * index: (0 <= idx < num_handlers). + * @return + * The pointer to the handler in the table. + */ +static inline struct rte_mempool_ops * +rte_mempool_handler_get(int handler_idx) +{ + return &rte_mempool_handler_table.handler_ops[handler_idx]; +} + +/** + * @internal wrapper for external mempool manager alloc callback. + * + * @param mp + * Pointer to the memory pool. + * @return + * The opaque pointer to the external pool. + */ +void * +rte_mempool_ops_alloc(struct rte_mempool *mp); + +/** + * @internal wrapper for external mempool manager get callback. + * + * @param mp + * Pointer to the memory pool. + * @param obj_table + * Pointer to a table of void * pointers (objects). + * @param n + * Number of objects to get. + * @return + * - 0: Success; got n objects. + * - <0: Error; code of handler get function. + */ +static inline int +rte_mempool_ops_dequeue_bulk(struct rte_mempool *mp, + void **obj_table, unsigned n) +{ + struct rte_mempool_ops *handler; + + handler = rte_mempool_handler_get(mp->handler_idx); + return handler->get(mp->pool, obj_table, n); +} + +/** + * @internal wrapper for external mempool manager put callback. + * + * @param mp + * Pointer to the memory pool. + * @param obj_table + * Pointer to a table of void * pointers (objects). + * @param n + * Number of objects to put. + * @return + * - 0: Success; n objects supplied. + * - <0: Error; code of handler put function. + */ +static inline int +rte_mempool_ops_enqueue_bulk(struct rte_mempool *mp, void * const *obj_table, + unsigned n) +{ + struct rte_mempool_ops *handler; + + handler = rte_mempool_handler_get(mp->handler_idx); + return handler->put(mp->pool, obj_table, n); +} + +/** + * @internal wrapper for external mempool manager get_count callback. + * + * @param mp + * Pointer to the memory pool. + * @return + * The number of available objects in the external pool. + */ +unsigned +rte_mempool_ops_get_count(const struct rte_mempool *mp); + +/** + * @internal wrapper for external mempool manager free callback. + * + * @param mp + * Pointer to the memory pool. + */ +void +rte_mempool_ops_free(struct rte_mempool *mp); + +/** + * Set the handler of a mempool + * + * This can only be done on a mempool that is not populated, i.e. just after + * a call to rte_mempool_create_empty(). + * + * @param mp + * Pointer to the memory pool. + * @param name + * Name of the handler. + * @return + * - 0: Sucess; the new handler is configured. + * - EINVAL - Invalid handler name provided + * - EEXIST - mempool already has a handler assigned + */ +int +rte_mempool_set_handler(struct rte_mempool *mp, const char *name); + +/** + * Register an external pool handler. + * + * @param h + * Pointer to the external pool handler + * @return + * - >=0: Sucess; return the index of the handler in the table. + * - EINVAL - missing callbacks while registering handler + * - ENOSPC - the maximum number of handlers has been reached + */ +int rte_mempool_handler_register(const struct rte_mempool_ops *h); + +/** + * Macro to statically register an external pool handler. + */ +#define MEMPOOL_REGISTER_HANDLER(h) \ + void mp_hdlr_init_##h(void); \ + void __attribute__((constructor, used)) mp_hdlr_init_##h(void) \ + { \ + rte_mempool_handler_register(&h); \ + } + /** * An object callback function for mempool. * @@ -774,7 +980,7 @@ __mempool_put_bulk(struct rte_mempool *mp, void * const *obj_table, cache->len += n; if (cache->len >= flushthresh) { - rte_ring_mp_enqueue_bulk(mp->ring, &cache->objs[cache_size], + rte_mempool_ops_enqueue_bulk(mp, &cache->objs[cache_size], cache->len - cache_size); cache->len = cache_size; } @@ -785,19 +991,10 @@ ring_enqueue: /* push remaining objects in ring */ #ifdef RTE_LIBRTE_MEMPOOL_DEBUG - if (is_mp) { - if (rte_ring_mp_enqueue_bulk(mp->ring, obj_table, n) < 0) - rte_panic("cannot put objects in mempool\n"); - } - else { - if (rte_ring_sp_enqueue_bulk(mp->ring, obj_table, n) < 0) - rte_panic("cannot put objects in mempool\n"); - } + if (rte_mempool_ops_enqueue_bulk(mp, obj_table, n) < 0) + rte_panic("cannot put objects in mempool\n"); #else - if (is_mp) - rte_ring_mp_enqueue_bulk(mp->ring, obj_table, n); - else - rte_ring_sp_enqueue_bulk(mp->ring, obj_table, n); + rte_mempool_ops_enqueue_bulk(mp, obj_table, n); #endif } @@ -922,7 +1119,7 @@ rte_mempool_put(struct rte_mempool *mp, void *obj) */ static inline int __attribute__((always_inline)) __mempool_get_bulk(struct rte_mempool *mp, void **obj_table, - unsigned n, int is_mc) + unsigned n, __rte_unused int is_mc) { int ret; struct rte_mempool_cache *cache; @@ -945,7 +1142,8 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table, uint32_t req = n + (cache_size - cache->len); /* How many do we require i.e. number to fill the cache + the request */ - ret = rte_ring_mc_dequeue_bulk(mp->ring, &cache->objs[cache->len], req); + ret = rte_mempool_ops_dequeue_bulk(mp, + &cache->objs[cache->len], req); if (unlikely(ret < 0)) { /* * In the offchance that we are buffer constrained, @@ -972,10 +1170,7 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table, ring_dequeue: /* get remaining objects from ring */ - if (is_mc) - ret = rte_ring_mc_dequeue_bulk(mp->ring, obj_table, n); - else - ret = rte_ring_sc_dequeue_bulk(mp->ring, obj_table, n); + ret = rte_mempool_ops_dequeue_bulk(mp, obj_table, n); if (ret < 0) __MEMPOOL_STAT_ADD(mp, get_fail, n); diff --git a/lib/librte_mempool/rte_mempool_handler.c b/lib/librte_mempool/rte_mempool_handler.c new file mode 100644 index 0000000..ed85d65 --- /dev/null +++ b/lib/librte_mempool/rte_mempool_handler.c @@ -0,0 +1,141 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2016 Intel Corporation. All rights reserved. + * Copyright(c) 2016 6WIND S.A. + * 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. + */ + +#include +#include + +#include + +/* indirect jump table to support external memory pools */ +struct rte_mempool_handler_table rte_mempool_handler_table = { + .sl = RTE_SPINLOCK_INITIALIZER , + .num_handlers = 0 +}; + +/* add a new handler in rte_mempool_handler_table, return its index */ +int +rte_mempool_handler_register(const struct rte_mempool_ops *h) +{ + struct rte_mempool_ops *handler; + int16_t handler_idx; + + rte_spinlock_lock(&rte_mempool_handler_table.sl); + + if (rte_mempool_handler_table.num_handlers >= + RTE_MEMPOOL_MAX_HANDLER_IDX) { + rte_spinlock_unlock(&rte_mempool_handler_table.sl); + RTE_LOG(ERR, MEMPOOL, + "Maximum number of mempool handlers exceeded\n"); + return -ENOSPC; + } + + if (h->put == NULL || h->get == NULL || h->get_count == NULL) { + rte_spinlock_unlock(&rte_mempool_handler_table.sl); + RTE_LOG(ERR, MEMPOOL, + "Missing callback while registering mempool handler\n"); + return -EINVAL; + } + + handler_idx = rte_mempool_handler_table.num_handlers++; + handler = &rte_mempool_handler_table.handler_ops[handler_idx]; + snprintf(handler->name, sizeof(handler->name), "%s", h->name); + handler->alloc = h->alloc; + handler->put = h->put; + handler->get = h->get; + handler->get_count = h->get_count; + + rte_spinlock_unlock(&rte_mempool_handler_table.sl); + + return handler_idx; +} + +/* wrapper to allocate an external pool handler */ +void * +rte_mempool_ops_alloc(struct rte_mempool *mp) +{ + struct rte_mempool_ops *handler; + + handler = rte_mempool_handler_get(mp->handler_idx); + if (handler->alloc == NULL) + return NULL; + return handler->alloc(mp); +} + +/* wrapper to free an external pool handler */ +void +rte_mempool_ops_free(struct rte_mempool *mp) +{ + struct rte_mempool_ops *handler; + + handler = rte_mempool_handler_get(mp->handler_idx); + if (handler->free == NULL) + return; + return handler->free(mp); +} + +/* wrapper to get available objects in an external pool handler */ +unsigned int +rte_mempool_ops_get_count(const struct rte_mempool *mp) +{ + struct rte_mempool_ops *handler; + + handler = rte_mempool_handler_get(mp->handler_idx); + return handler->get_count(mp->pool); +} + +/* sets a handler previously registered by rte_mempool_handler_register */ +int +rte_mempool_set_handler(struct rte_mempool *mp, const char *name) +{ + struct rte_mempool_ops *handler = NULL; + unsigned i; + + /* too late, the mempool is already populated */ + if (mp->flags & MEMPOOL_F_RING_CREATED) + return -EEXIST; + + for (i = 0; i < rte_mempool_handler_table.num_handlers; i++) { + if (!strcmp(name, + rte_mempool_handler_table.handler_ops[i].name)) { + handler = &rte_mempool_handler_table.handler_ops[i]; + break; + } + } + + if (handler == NULL) + return -EINVAL; + + mp->handler_idx = i; + return 0; +}