99a2dd955f
There is no reason for the DPDK libraries to all have 'librte_' prefix on the directory names. This prefix makes the directory names longer and also makes it awkward to add features referring to individual libraries in the build - should the lib names be specified with or without the prefix. Therefore, we can just remove the library prefix and use the library's unique name as the directory name, i.e. 'eal' rather than 'librte_eal' Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2010-2014 Intel Corporation
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*/
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#include <unistd.h>
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#include <limits.h>
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#include <string.h>
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#include <dirent.h>
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#include <rte_log.h>
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#include <rte_eal.h>
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#include <rte_lcore.h>
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#include <rte_common.h>
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#include <rte_string_fns.h>
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#include <rte_debug.h>
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#include "eal_private.h"
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#include "eal_filesystem.h"
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#include "eal_thread.h"
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#define SYS_CPU_DIR "/sys/devices/system/cpu/cpu%u"
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#define CORE_ID_FILE "topology/core_id"
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#define NUMA_NODE_PATH "/sys/devices/system/node"
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/* Check if a cpu is present by the presence of the cpu information for it */
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int
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eal_cpu_detected(unsigned lcore_id)
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{
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char path[PATH_MAX];
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int len = snprintf(path, sizeof(path), SYS_CPU_DIR
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"/"CORE_ID_FILE, lcore_id);
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if (len <= 0 || (unsigned)len >= sizeof(path))
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return 0;
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if (access(path, F_OK) != 0)
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return 0;
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return 1;
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}
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/*
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* Get CPU socket id (NUMA node) for a logical core.
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*
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* This searches each nodeX directories in /sys for the symlink for the given
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* lcore_id and returns the numa node where the lcore is found. If lcore is not
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* found on any numa node, returns zero.
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*/
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unsigned
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eal_cpu_socket_id(unsigned lcore_id)
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{
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unsigned socket;
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for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) {
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char path[PATH_MAX];
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snprintf(path, sizeof(path), "%s/node%u/cpu%u", NUMA_NODE_PATH,
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socket, lcore_id);
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if (access(path, F_OK) == 0)
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return socket;
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}
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return 0;
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}
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/* Get the cpu core id value from the /sys/.../cpuX core_id value */
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unsigned
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eal_cpu_core_id(unsigned lcore_id)
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{
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char path[PATH_MAX];
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unsigned long id;
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int len = snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", lcore_id, CORE_ID_FILE);
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if (len <= 0 || (unsigned)len >= sizeof(path))
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goto err;
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if (eal_parse_sysfs_value(path, &id) != 0)
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goto err;
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return (unsigned)id;
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err:
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RTE_LOG(ERR, EAL, "Error reading core id value from %s "
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"for lcore %u - assuming core 0\n", SYS_CPU_DIR, lcore_id);
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return 0;
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}
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