diff options
author | Hanoh Haim <hhaim@cisco.com> | 2015-06-24 14:03:29 +0300 |
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committer | Hanoh Haim <hhaim@cisco.com> | 2015-06-24 14:03:29 +0300 |
commit | 8b52a31ed2c299b759f330c4f976b9c70f5765f4 (patch) | |
tree | 9d6da5438b5b56b1d2d57e6c13494b4e65d000e7 /src/dpdk_lib18/librte_eal/linuxapp/eal/eal_lcore.c |
first version
Diffstat (limited to 'src/dpdk_lib18/librte_eal/linuxapp/eal/eal_lcore.c')
-rwxr-xr-x | src/dpdk_lib18/librte_eal/linuxapp/eal/eal_lcore.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_lcore.c b/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_lcore.c new file mode 100755 index 00000000..c67e0e68 --- /dev/null +++ b/src/dpdk_lib18/librte_eal/linuxapp/eal/eal_lcore.c @@ -0,0 +1,191 @@ +/*- + * 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. + */ + +#include <unistd.h> +#include <limits.h> +#include <string.h> +#include <dirent.h> + +#include <rte_log.h> +#include <rte_eal.h> +#include <rte_lcore.h> +#include <rte_common.h> +#include <rte_string_fns.h> +#include <rte_debug.h> + +#include "eal_private.h" +#include "eal_filesystem.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" + +/* Check if a cpu is present by the presence of the cpu information for it */ +static int +cpu_detected(unsigned lcore_id) +{ + char path[PATH_MAX]; + int len = snprintf(path, sizeof(path), SYS_CPU_DIR + "/"CORE_ID_FILE, lcore_id); + if (len <= 0 || (unsigned)len >= sizeof(path)) + return 0; + if (access(path, F_OK) != 0) + return 0; + + 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 + */ +static unsigned +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 = NULL; + unsigned long id = 0; + struct dirent *e; + char *endptr = NULL; + + int len = snprintf(path, sizeof(path), + SYS_CPU_DIR, lcore_id); + if (len <= 0 || (unsigned)len >= sizeof(path)) + goto err; + + 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; + } + } + 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 = 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; + } + closedir(d); + return (unsigned)id; + +err: + if (d) + closedir(d); + 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) +{ + char path[PATH_MAX]; + unsigned long id; + + 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) + goto err; + return (unsigned)id; + +err: + RTE_LOG(ERR, EAL, "Error reading core id value from %s " + "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; +} |