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;
+}