X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_eal%2Flinuxapp%2Feal%2Feal_lcore.c;h=bc8965844ceece73e18835ae1a10ff21f0af52a0;hb=b1621823eacbe4669a4b581d6c420db08f9e6505;hp=91164e54e186a21977a6cefd031e340666192281;hpb=b20539d687d55255a5ef249f0216e11d300d514f;p=dpdk.git diff --git a/lib/librte_eal/linuxapp/eal/eal_lcore.c b/lib/librte_eal/linuxapp/eal/eal_lcore.c index 91164e54e1..bc8965844c 100644 --- a/lib/librte_eal/linuxapp/eal/eal_lcore.c +++ b/lib/librte_eal/linuxapp/eal/eal_lcore.c @@ -1,34 +1,5 @@ -/*- - * 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. +/* SPDX-License-Identifier: BSD-3-Clause + * Copyright(c) 2010-2014 Intel Corporation */ #include @@ -45,17 +16,18 @@ #include "eal_private.h" #include "eal_filesystem.h" +#include "eal_thread.h" #define SYS_CPU_DIR "/sys/devices/system/cpu/cpu%u" #define CORE_ID_FILE "topology/core_id" -#define PHYS_PKG_FILE "topology/physical_package_id" +#define NUMA_NODE_PATH "/sys/devices/system/node" /* Check if a cpu is present by the presence of the cpu information for it */ -static int -cpu_detected(unsigned lcore_id) +int +eal_cpu_detected(unsigned lcore_id) { char path[PATH_MAX]; - int len = rte_snprintf(path, sizeof(path), SYS_CPU_DIR + int len = snprintf(path, sizeof(path), SYS_CPU_DIR "/"CORE_ID_FILE, lcore_id); if (len <= 0 || (unsigned)len >= sizeof(path)) return 0; @@ -65,67 +37,37 @@ cpu_detected(unsigned lcore_id) return 1; } -/* Get CPU socket id (NUMA node) by reading directory - * /sys/devices/system/cpu/cpuX looking for symlink "nodeY" - * which gives the NUMA topology information. - * Note: physical package id != NUMA node, but we use it as a - * fallback for kernels which don't create a nodeY link +/* + * Get CPU socket id (NUMA node) for a logical core. + * + * This searches each nodeX directories in /sys for the symlink for the given + * lcore_id and returns the numa node where the lcore is found. If lcore is not + * found on any numa node, returns zero. */ -static unsigned -cpu_socket_id(unsigned lcore_id) +unsigned +eal_cpu_socket_id(unsigned lcore_id) { - const char node_prefix[] = "node"; - const size_t prefix_len = sizeof(node_prefix) - 1; - char path[PATH_MAX]; - DIR *d; - unsigned long id = 0; - struct dirent *e; - char *endptr = NULL; + unsigned socket; - int len = rte_snprintf(path, sizeof(path), - SYS_CPU_DIR, lcore_id); - if (len <= 0 || (unsigned)len >= sizeof(path)) - goto err; + for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) { + char path[PATH_MAX]; - d = opendir(path); - if (!d) - goto err; - - while ((e = readdir(d)) != NULL) { - if (strncmp(e->d_name, node_prefix, prefix_len) == 0) { - id = strtoul(e->d_name+prefix_len, &endptr, 0); - break; - } - } - closedir(d); - if (endptr == NULL || *endptr!='\0' || endptr == e->d_name+prefix_len) { - RTE_LOG(WARNING, EAL, "Cannot read numa node link " - "for lcore %u - using physical package id instead\n", - lcore_id); - - len = rte_snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", - lcore_id, PHYS_PKG_FILE); - if (len <= 0 || (unsigned)len >= sizeof(path)) - goto err; - if (eal_parse_sysfs_value(path, &id) != 0) - goto err; + snprintf(path, sizeof(path), "%s/node%u/cpu%u", NUMA_NODE_PATH, + socket, lcore_id); + if (access(path, F_OK) == 0) + return socket; } - return (unsigned)id; - -err: - RTE_LOG(ERR, EAL, "Error getting NUMA socket information from %s " - "for lcore %u - assuming NUMA socket 0\n", SYS_CPU_DIR, lcore_id); return 0; } /* Get the cpu core id value from the /sys/.../cpuX core_id value */ -static unsigned -cpu_core_id(unsigned lcore_id) +unsigned +eal_cpu_core_id(unsigned lcore_id) { char path[PATH_MAX]; unsigned long id; - int len = rte_snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", lcore_id, CORE_ID_FILE); + int len = snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", lcore_id, CORE_ID_FILE); if (len <= 0 || (unsigned)len >= sizeof(path)) goto err; if (eal_parse_sysfs_value(path, &id) != 0) @@ -137,53 +79,3 @@ err: "for lcore %u - assuming core 0\n", SYS_CPU_DIR, lcore_id); return 0; } - -/* - * Parse /sys/devices/system/cpu to get the number of physical and logical - * processors on the machine. The function will fill the cpu_info - * structure. - */ -int -rte_eal_cpu_init(void) -{ - /* pointer to global configuration */ - struct rte_config *config = rte_eal_get_configuration(); - unsigned lcore_id; - unsigned count = 0; - - /* - * Parse the maximum set of logical cores, detect the subset of running - * ones and enable them by default. - */ - for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) { - lcore_config[lcore_id].detected = cpu_detected(lcore_id); - if (lcore_config[lcore_id].detected == 0) { - config->lcore_role[lcore_id] = ROLE_OFF; - continue; - } - /* By default, each detected core is enabled */ - config->lcore_role[lcore_id] = ROLE_RTE; - lcore_config[lcore_id].core_id = cpu_core_id(lcore_id); - lcore_config[lcore_id].socket_id = cpu_socket_id(lcore_id); - if (lcore_config[lcore_id].socket_id >= RTE_MAX_NUMA_NODES) -#ifdef RTE_EAL_ALLOW_INV_SOCKET_ID - lcore_config[lcore_id].socket_id = 0; -#else - rte_panic("Socket ID (%u) is greater than " - "RTE_MAX_NUMA_NODES (%d)\n", - lcore_config[lcore_id].socket_id, RTE_MAX_NUMA_NODES); -#endif - RTE_LOG(DEBUG, EAL, "Detected lcore %u as core %u on socket %u\n", - lcore_id, - lcore_config[lcore_id].core_id, - lcore_config[lcore_id].socket_id); - count ++; - } - /* Set the count of enabled logical cores of the EAL configuration */ - config->lcore_count = count; - RTE_LOG(DEBUG, EAL, "Support maximum %u logical core(s) by configuration.\n", - RTE_MAX_LCORE); - RTE_LOG(DEBUG, EAL, "Detected %u lcore(s)\n", config->lcore_count); - - return 0; -}