From: Tal Shnaiderman Date: Wed, 6 Jan 2021 20:35:53 +0000 (+0200) Subject: eal: add generic thread-local-storage functions X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=b1fd151267e6;p=dpdk.git eal: add generic thread-local-storage functions Add support for TLS functionality in EAL. The following functions are added: rte_thread_tls_key_create - create a TLS data key. rte_thread_tls_key_delete - delete a TLS data key. rte_thread_tls_value_set - set value bound to the TLS key rte_thread_tls_value_get - get value bound to the TLS key TLS key is defined by the new type rte_tls_key. The API allocates the thread local storage (TLS) key. Any thread of the process can subsequently use this key to store and retrieve values that are local to the thread. Those functions are added in addition to TLS capability in rte_per_lcore.h to allow abstraction of the pthread layer for all operating systems. Windows implementation is under librte_eal/windows and implemented using WIN32 API for Windows only. Unix implementation is under librte_eal/unix and implemented using pthread for UNIX compilation. Signed-off-by: Tal Shnaiderman Acked-by: Dmitry Kozlyuk Acked-by: Thomas Monjalon --- diff --git a/lib/librte_eal/include/rte_thread.h b/lib/librte_eal/include/rte_thread.h index a1ced3cf72..f1ae2d32cc 100644 --- a/lib/librte_eal/include/rte_thread.h +++ b/lib/librte_eal/include/rte_thread.h @@ -19,6 +19,11 @@ extern "C" { #endif +/** + * TLS key type, an opaque pointer. + */ +typedef struct eal_tls_key *rte_tls_key; + /** * Set core affinity of the current thread. * Support both EAL and non-EAL thread and update TLS. @@ -40,6 +45,66 @@ int rte_thread_set_affinity(rte_cpuset_t *cpusetp); */ void rte_thread_get_affinity(rte_cpuset_t *cpusetp); +/** + * Create a TLS data key visible to all threads in the process. + * the created key is later used to get/set a value. + * and optional destructor can be set to be called when a thread exits. + * + * @param key + * Pointer to store the allocated key. + * @param destructor + * The function to be called when the thread exits. + * Ignored on Windows OS. + * + * @return + * On success, zero. + * On failure, a negative number. + */ + +__rte_experimental +int rte_thread_tls_key_create(rte_tls_key *key, void (*destructor)(void *)); + +/** + * Delete a TLS data key visible to all threads in the process. + * + * @param key + * The key allocated by rte_thread_tls_key_create(). + * + * @return + * On success, zero. + * On failure, a negative number. + */ +__rte_experimental +int rte_thread_tls_key_delete(rte_tls_key key); + +/** + * Set value bound to the TLS key on behalf of the calling thread. + * + * @param key + * The key allocated by rte_thread_tls_key_create(). + * @param value + * The value bound to the rte_tls_key key for the calling thread. + * + * @return + * On success, zero. + * On failure, a negative number. + */ +__rte_experimental +int rte_thread_tls_value_set(rte_tls_key key, const void *value); + +/** + * Get value bound to the TLS key on behalf of the calling thread. + * + * @param key + * The key allocated by rte_thread_tls_key_create(). + * + * @return + * On success, value data pointer (can also be NULL). + * On failure, NULL and an error number is set in rte_errno. + */ +__rte_experimental +void *rte_thread_tls_value_get(rte_tls_key key); + #ifdef __cplusplus } #endif diff --git a/lib/librte_eal/rte_eal_exports.def b/lib/librte_eal/rte_eal_exports.def index 4597eb8cd5..f12832cab5 100644 --- a/lib/librte_eal/rte_eal_exports.def +++ b/lib/librte_eal/rte_eal_exports.def @@ -322,6 +322,11 @@ EXPORTS rte_vect_get_max_simd_bitwidth rte_vect_set_max_simd_bitwidth + rte_thread_tls_key_create + rte_thread_tls_key_delete + rte_thread_tls_value_get + rte_thread_tls_value_set + rte_mem_lock rte_mem_map rte_mem_page_size diff --git a/lib/librte_eal/unix/meson.build b/lib/librte_eal/unix/meson.build index d3af6b6fe2..71221b84a4 100644 --- a/lib/librte_eal/unix/meson.build +++ b/lib/librte_eal/unix/meson.build @@ -5,4 +5,5 @@ sources += files( 'eal_file.c', 'eal_unix_memory.c', 'eal_unix_timer.c', + 'rte_thread.c', ) diff --git a/lib/librte_eal/unix/rte_thread.c b/lib/librte_eal/unix/rte_thread.c new file mode 100644 index 0000000000..86ffeebc95 --- /dev/null +++ b/lib/librte_eal/unix/rte_thread.c @@ -0,0 +1,86 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright 2021 Mellanox Technologies, Ltd + */ + +#include +#include +#include +#include + +#include +#include +#include +#include + +struct eal_tls_key { + pthread_key_t thread_index; +}; + +int +rte_thread_tls_key_create(rte_tls_key *key, void (*destructor)(void *)) +{ + int err; + + *key = malloc(sizeof(**key)); + if ((*key) == NULL) { + RTE_LOG(DEBUG, EAL, "Cannot allocate TLS key.\n"); + return -1; + } + err = pthread_key_create(&((*key)->thread_index), destructor); + if (err) { + RTE_LOG(DEBUG, EAL, "pthread_key_create failed: %s\n", + strerror(err)); + free(*key); + return -1; + } + return 0; +} + +int +rte_thread_tls_key_delete(rte_tls_key key) +{ + int err; + + if (!key) { + RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n"); + return -1; + } + err = pthread_key_delete(key->thread_index); + if (err) { + RTE_LOG(DEBUG, EAL, "pthread_key_delete failed: %s\n", + strerror(err)); + free(key); + return -1; + } + free(key); + return 0; +} + +int +rte_thread_tls_value_set(rte_tls_key key, const void *value) +{ + int err; + + if (!key) { + RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n"); + return -1; + } + err = pthread_setspecific(key->thread_index, value); + if (err) { + RTE_LOG(DEBUG, EAL, "pthread_setspecific failed: %s\n", + strerror(err)); + return -1; + } + return 0; +} + +void * +rte_thread_tls_value_get(rte_tls_key key) +{ + if (!key) { + RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n"); + rte_errno = EINVAL; + return NULL; + } + return pthread_getspecific(key->thread_index); +} diff --git a/lib/librte_eal/version.map b/lib/librte_eal/version.map index 354c068f31..b1db7ec795 100644 --- a/lib/librte_eal/version.map +++ b/lib/librte_eal/version.map @@ -403,6 +403,12 @@ EXPERIMENTAL { rte_service_lcore_may_be_active; rte_vect_get_max_simd_bitwidth; rte_vect_set_max_simd_bitwidth; + + # added in 21.02 + rte_thread_tls_key_create; + rte_thread_tls_key_delete; + rte_thread_tls_value_get; + rte_thread_tls_value_set; }; INTERNAL { diff --git a/lib/librte_eal/windows/meson.build b/lib/librte_eal/windows/meson.build index 3b2faf29eb..42ff5c2d59 100644 --- a/lib/librte_eal/windows/meson.build +++ b/lib/librte_eal/windows/meson.build @@ -19,6 +19,7 @@ sources += files( 'eal_timer.c', 'fnmatch.c', 'getopt.c', + 'rte_thread.c', ) dpdk_conf.set10('RTE_EAL_NUMA_AWARE_HUGEPAGES', true) diff --git a/lib/librte_eal/windows/rte_thread.c b/lib/librte_eal/windows/rte_thread.c new file mode 100644 index 0000000000..2e2ab29177 --- /dev/null +++ b/lib/librte_eal/windows/rte_thread.c @@ -0,0 +1,83 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright 2021 Mellanox Technologies, Ltd + */ + +#include +#include +#include +#include + +struct eal_tls_key { + DWORD thread_index; +}; + +int +rte_thread_tls_key_create(rte_tls_key *key, + __rte_unused void (*destructor)(void *)) +{ + *key = malloc(sizeof(**key)); + if ((*key) == NULL) { + RTE_LOG(DEBUG, EAL, "Cannot allocate TLS key.\n"); + return -1; + } + (*key)->thread_index = TlsAlloc(); + if ((*key)->thread_index == TLS_OUT_OF_INDEXES) { + RTE_LOG_WIN32_ERR("TlsAlloc()"); + free(*key); + return -1; + } + return 0; +} + +int +rte_thread_tls_key_delete(rte_tls_key key) +{ + if (!key) { + RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n"); + return -1; + } + if (!TlsFree(key->thread_index)) { + RTE_LOG_WIN32_ERR("TlsFree()"); + free(key); + return -1; + } + free(key); + return 0; +} + +int +rte_thread_tls_value_set(rte_tls_key key, const void *value) +{ + char *p; + + if (!key) { + RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n"); + return -1; + } + /* discard const qualifier */ + p = (char *) (uintptr_t) value; + if (!TlsSetValue(key->thread_index, p)) { + RTE_LOG_WIN32_ERR("TlsSetValue()"); + return -1; + } + return 0; +} + +void * +rte_thread_tls_value_get(rte_tls_key key) +{ + void *output; + + if (!key) { + RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n"); + rte_errno = EINVAL; + return NULL; + } + output = TlsGetValue(key->thread_index); + if (GetLastError() != ERROR_SUCCESS) { + RTE_LOG_WIN32_ERR("TlsGetValue()"); + rte_errno = ENOEXEC; + return NULL; + } + return output; +}