From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from foss.arm.com (foss.arm.com [217.140.101.70]) by dpdk.org (Postfix) with ESMTP id 5EB8958EC; Fri, 26 Oct 2018 07:37:44 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 9301EEBD; Thu, 25 Oct 2018 22:37:43 -0700 (PDT) Received: from 2p2660v4-1.austin.arm.com (2p2660v4-1.austin.arm.com [10.118.14.139]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 248913F71D; Thu, 25 Oct 2018 22:37:43 -0700 (PDT) From: Honnappa Nagarahalli To: bruce.richardson@intel.com, pablo.de.lara.guarch@intel.com Cc: dev@dpdk.org, yipeng1.wang@intel.com, honnappa.nagarahalli@arm.com, dharmik.thakkar@arm.com, gavin.hu@arm.com, nd@arm.com, stable@dpdk.org Date: Fri, 26 Oct 2018 00:37:29 -0500 Message-Id: <1540532253-112591-2-git-send-email-honnappa.nagarahalli@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1540532253-112591-1-git-send-email-honnappa.nagarahalli@arm.com> References: <1540532253-112591-1-git-send-email-honnappa.nagarahalli@arm.com> Subject: [dpdk-stable] [PATCH v7 1/5] hash: separate multi-writer from rw-concurrency X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Oct 2018 05:37:45 -0000 RW concurrency is required with single writer and multiple reader usecase as well. Hence, multi-writer should not be enabled by default when RW concurrency is enabled. Fixes: f2e3001b53ec ("hash: support read/write concurrency") Cc: stable@dpdk.org Signed-off-by: Honnappa Nagarahalli Reviewed-by: Gavin Hu Reviewed-by: Yipeng Wang Acked-by: Bruce Richardson --- lib/librte_hash/rte_cuckoo_hash.c | 49 +++++++++++++++++++++------------------ lib/librte_hash/rte_cuckoo_hash.h | 8 +++++-- test/test/test_hash_readwrite.c | 6 +++-- 3 files changed, 37 insertions(+), 26 deletions(-) diff --git a/lib/librte_hash/rte_cuckoo_hash.c b/lib/librte_hash/rte_cuckoo_hash.c index 9a48934..3539a10 100644 --- a/lib/librte_hash/rte_cuckoo_hash.c +++ b/lib/librte_hash/rte_cuckoo_hash.c @@ -136,9 +136,10 @@ rte_hash_create(const struct rte_hash_parameters *params) char ext_ring_name[RTE_RING_NAMESIZE]; unsigned num_key_slots; unsigned i; - unsigned int hw_trans_mem_support = 0, multi_writer_support = 0; + unsigned int hw_trans_mem_support = 0, use_local_cache = 0; unsigned int ext_table_support = 0; unsigned int readwrite_concur_support = 0; + unsigned int writer_takes_lock = 0; rte_hash_function default_hash_func = (rte_hash_function)rte_jhash; @@ -162,19 +163,21 @@ rte_hash_create(const struct rte_hash_parameters *params) if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT) hw_trans_mem_support = 1; - if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD) - multi_writer_support = 1; + if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD) { + use_local_cache = 1; + writer_takes_lock = 1; + } if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY) { readwrite_concur_support = 1; - multi_writer_support = 1; + writer_takes_lock = 1; } if (params->extra_flag & RTE_HASH_EXTRA_FLAGS_EXT_TABLE) ext_table_support = 1; /* Store all keys and leave the first entry as a dummy entry for lookup_bulk */ - if (multi_writer_support) + if (use_local_cache) /* * Increase number of slots by total number of indices * that can be stored in the lcore caches @@ -322,7 +325,7 @@ rte_hash_create(const struct rte_hash_parameters *params) h->cmp_jump_table_idx = KEY_OTHER_BYTES; #endif - if (multi_writer_support) { + if (use_local_cache) { h->local_free_slots = rte_zmalloc_socket(NULL, sizeof(struct lcore_cache) * RTE_MAX_LCORE, RTE_CACHE_LINE_SIZE, params->socket_id); @@ -352,9 +355,10 @@ rte_hash_create(const struct rte_hash_parameters *params) h->key_store = k; h->free_slots = r; h->hw_trans_mem_support = hw_trans_mem_support; - h->multi_writer_support = multi_writer_support; + h->use_local_cache = use_local_cache; h->readwrite_concur_support = readwrite_concur_support; h->ext_table_support = ext_table_support; + h->writer_takes_lock = writer_takes_lock; #if defined(RTE_ARCH_X86) if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_SSE2)) @@ -363,10 +367,11 @@ rte_hash_create(const struct rte_hash_parameters *params) #endif h->sig_cmp_fn = RTE_HASH_COMPARE_SCALAR; - /* Turn on multi-writer only with explicit flag from user and TM - * support. + /* Writer threads need to take the lock when: + * 1) RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY is enabled OR + * 2) RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD is enabled */ - if (h->multi_writer_support) { + if (h->writer_takes_lock) { h->readwrite_lock = rte_malloc(NULL, sizeof(rte_rwlock_t), RTE_CACHE_LINE_SIZE); if (h->readwrite_lock == NULL) @@ -425,10 +430,10 @@ rte_hash_free(struct rte_hash *h) rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK); - if (h->multi_writer_support) { + if (h->use_local_cache) rte_free(h->local_free_slots); + if (h->writer_takes_lock) rte_free(h->readwrite_lock); - } rte_ring_free(h->free_slots); rte_ring_free(h->free_ext_bkts); rte_free(h->key_store); @@ -454,7 +459,7 @@ rte_hash_count(const struct rte_hash *h) if (h == NULL) return -EINVAL; - if (h->multi_writer_support) { + if (h->use_local_cache) { tot_ring_cnt = h->entries + (RTE_MAX_LCORE - 1) * (LCORE_CACHE_SIZE - 1); for (i = 0; i < RTE_MAX_LCORE; i++) @@ -473,9 +478,9 @@ rte_hash_count(const struct rte_hash *h) static inline void __hash_rw_writer_lock(const struct rte_hash *h) { - if (h->multi_writer_support && h->hw_trans_mem_support) + if (h->writer_takes_lock && h->hw_trans_mem_support) rte_rwlock_write_lock_tm(h->readwrite_lock); - else if (h->multi_writer_support) + else if (h->writer_takes_lock) rte_rwlock_write_lock(h->readwrite_lock); } @@ -491,9 +496,9 @@ __hash_rw_reader_lock(const struct rte_hash *h) static inline void __hash_rw_writer_unlock(const struct rte_hash *h) { - if (h->multi_writer_support && h->hw_trans_mem_support) + if (h->writer_takes_lock && h->hw_trans_mem_support) rte_rwlock_write_unlock_tm(h->readwrite_lock); - else if (h->multi_writer_support) + else if (h->writer_takes_lock) rte_rwlock_write_unlock(h->readwrite_lock); } @@ -532,7 +537,7 @@ rte_hash_reset(struct rte_hash *h) } /* Repopulate the free slots ring. Entry zero is reserved for key misses */ - if (h->multi_writer_support) + if (h->use_local_cache) tot_ring_cnt = h->entries + (RTE_MAX_LCORE - 1) * (LCORE_CACHE_SIZE - 1); else @@ -548,7 +553,7 @@ rte_hash_reset(struct rte_hash *h) (void *)((uintptr_t) i)); } - if (h->multi_writer_support) { + if (h->use_local_cache) { /* Reset local caches per lcore */ for (i = 0; i < RTE_MAX_LCORE; i++) h->local_free_slots[i].len = 0; @@ -566,7 +571,7 @@ enqueue_slot_back(const struct rte_hash *h, struct lcore_cache *cached_free_slots, void *slot_id) { - if (h->multi_writer_support) { + if (h->use_local_cache) { cached_free_slots->objs[cached_free_slots->len] = slot_id; cached_free_slots->len++; } else @@ -848,7 +853,7 @@ __rte_hash_add_key_with_hash(const struct rte_hash *h, const void *key, __hash_rw_writer_unlock(h); /* Did not find a match, so get a new slot for storing the new key */ - if (h->multi_writer_support) { + if (h->use_local_cache) { lcore_id = rte_lcore_id(); cached_free_slots = &h->local_free_slots[lcore_id]; /* Try to get a free slot from the local cache */ @@ -1117,7 +1122,7 @@ remove_entry(const struct rte_hash *h, struct rte_hash_bucket *bkt, unsigned i) struct lcore_cache *cached_free_slots; bkt->sig_current[i] = NULL_SIGNATURE; - if (h->multi_writer_support) { + if (h->use_local_cache) { lcore_id = rte_lcore_id(); cached_free_slots = &h->local_free_slots[lcore_id]; /* Cache full, need to free it. */ diff --git a/lib/librte_hash/rte_cuckoo_hash.h b/lib/librte_hash/rte_cuckoo_hash.h index 7753cd8..8c522ac 100644 --- a/lib/librte_hash/rte_cuckoo_hash.h +++ b/lib/librte_hash/rte_cuckoo_hash.h @@ -161,11 +161,15 @@ struct rte_hash { /**< Length of hash key. */ uint8_t hw_trans_mem_support; /**< If hardware transactional memory is used. */ - uint8_t multi_writer_support; - /**< If multi-writer support is enabled. */ + uint8_t use_local_cache; + /**< If multi-writer support is enabled, use local cache + * to allocate key-store slots. + */ uint8_t readwrite_concur_support; /**< If read-write concurrency support is enabled */ uint8_t ext_table_support; /**< Enable extendable bucket table */ + uint8_t writer_takes_lock; + /**< Indicates if the writer threads need to take lock */ rte_hash_function hash_func; /**< Function used to calculate hash. */ uint32_t hash_func_init_val; /**< Init value used by hash_func. */ rte_hash_cmp_eq_t rte_hash_custom_cmp_eq; diff --git a/test/test/test_hash_readwrite.c b/test/test/test_hash_readwrite.c index 2a4f7b9..a8fadd0 100644 --- a/test/test/test_hash_readwrite.c +++ b/test/test/test_hash_readwrite.c @@ -122,10 +122,12 @@ init_params(int use_htm, int use_jhash) if (use_htm) hash_params.extra_flag = RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT | - RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY; + RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY | + RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD; else hash_params.extra_flag = - RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY; + RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY | + RTE_HASH_EXTRA_FLAGS_MULTI_WRITER_ADD; hash_params.name = "tests"; -- 2.7.4