summaryrefslogtreecommitdiff
path: root/lib/librte_eal/linuxapp/eal/eal_lcore.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/librte_eal/linuxapp/eal/eal_lcore.c')
-rw-r--r--lib/librte_eal/linuxapp/eal/eal_lcore.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/lib/librte_eal/linuxapp/eal/eal_lcore.c b/lib/librte_eal/linuxapp/eal/eal_lcore.c
new file mode 100644
index 0000000..dde9bc1
--- /dev/null
+++ b/lib/librte_eal/linuxapp/eal/eal_lcore.c
@@ -0,0 +1,192 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2012 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.
+ *
+ * version: DPDK.L.1.2.3-3
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/queue.h>
+
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_launch.h>
+#include <rte_tailq.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_debug.h>
+
+#include "eal_private.h"
+
+#define PROC_CPUINFO "/proc/cpuinfo"
+#define PROC_PROCESSOR_FMT ""
+
+/* parse one line and try to match "processor : %d". */
+static int
+parse_processor_id(const char *buf, unsigned *lcore_id)
+{
+ static const char _processor[] = "processor";
+ const char *s;
+
+ if (strncmp(buf, _processor, sizeof(_processor) - 1) != 0)
+ return -1;
+
+ s = strchr(buf, ':');
+ if (s == NULL)
+ return -1;
+
+ errno = 0;
+ *lcore_id = strtoul(s+1, NULL, 10);
+ if (errno != 0) {
+ *lcore_id = -1;
+ return -1;
+ }
+
+ return 0;
+}
+
+/* parse one line and try to match "physical id : %d". */
+static int
+parse_socket_id(const char *buf, unsigned *socket_id)
+{
+ static const char _physical_id[] = "physical id";
+ const char *s;
+
+ if (strncmp(buf, _physical_id, sizeof(_physical_id) - 1) != 0)
+ return -1;
+
+ s = strchr(buf, ':');
+ if (s == NULL)
+ return -1;
+
+ errno = 0;
+ *socket_id = strtoul(s+1, NULL, 10);
+ if (errno != 0)
+ return -1;
+
+ return 0;
+}
+
+/*
+ * Parse /proc/cpuinfo 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)
+{
+ struct rte_config *config;
+ FILE *f;
+ char buf[BUFSIZ];
+ unsigned lcore_id = 0;
+ unsigned socket_id = 0;
+ unsigned count = 0;
+
+ /* get pointer to global configuration */
+ config = rte_eal_get_configuration();
+
+ /* open /proc/cpuinfo */
+ f = fopen(PROC_CPUINFO, "r");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): Cannot find "PROC_CPUINFO"\n", __func__);
+ return -1;
+ }
+
+ /*
+ * browse lines of /proc/cpuinfo and fill memseg entries in
+ * global configuration
+ */
+ while (fgets(buf, sizeof(buf), f) != NULL) {
+
+ if (parse_processor_id(buf, &lcore_id) == 0)
+ continue;
+
+ if (parse_socket_id(buf, &socket_id) == 0)
+ continue;
+
+ if (buf[0] == '\n') {
+ RTE_LOG(DEBUG, EAL, "Detected lcore %u on socket %u\n",
+ lcore_id, socket_id);
+ if (lcore_id >= RTE_MAX_LCORE) {
+ RTE_LOG(DEBUG, EAL,
+ "Skip lcore %u >= RTE_MAX_LCORE\n",
+ lcore_id);
+ continue;
+ }
+
+ /*
+ * In a virtualization environment, the socket ID
+ * reported by the system may not be linked to a real
+ * physical socket ID, and may be incoherent. So in this
+ * case, a default socket ID of 0 is assigned.
+ */
+ if (socket_id >= RTE_MAX_NUMA_NODES) {
+#ifdef CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID
+ socket_id = 0;
+#else
+ rte_panic("Socket ID (%u) is greater than "
+ "RTE_MAX_NUMA_NODES (%d)\n",
+ socket_id, RTE_MAX_NUMA_NODES);
+#endif
+ }
+
+ lcore_config[lcore_id].detected = 1;
+ lcore_config[lcore_id].socket_id = socket_id;
+
+ }
+ }
+
+ fclose(f);
+
+ /* disable lcores that were not detected */
+ RTE_LCORE_FOREACH(lcore_id) {
+
+ if (lcore_config[lcore_id].detected == 0) {
+ RTE_LOG(DEBUG, EAL, "Skip lcore %u (not detected)\n",
+ lcore_id);
+ config->lcore_role[lcore_id] = ROLE_OFF;
+ }
+ else
+ count ++;
+ }
+
+ config->lcore_count = count;
+
+ return 0;
+}