Imported Upstream version 16.04

Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>

1 files changed, 202 insertions, 0 deletions

diff --git a/lib/librte_eal/common/eal_common_tailqs.c b/lib/librte_eal/common/eal_common_tailqs.c
new file mode 100644
index 00000000..bb08ec8b
--- /dev/null
+++ b/lib/librte_eal/common/eal_common_tailqs.c
@@ -0,0 +1,202 @@
+/*-
+ *   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 <sys/queue.h>
+#include <stdint.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_launch.h>
+#include <rte_eal.h>
+#include <rte_eal_memconfig.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_memory.h>
+#include <rte_atomic.h>
+#include <rte_branch_prediction.h>
+#include <rte_log.h>
+#include <rte_string_fns.h>
+#include <rte_debug.h>
+
+#include "eal_private.h"
+
+TAILQ_HEAD(rte_tailq_elem_head, rte_tailq_elem);
+/* local tailq list */
+static struct rte_tailq_elem_head rte_tailq_elem_head =
+	TAILQ_HEAD_INITIALIZER(rte_tailq_elem_head);
+
+/* number of tailqs registered, -1 before call to rte_eal_tailqs_init */
+static int rte_tailqs_count = -1;
+
+struct rte_tailq_head *
+rte_eal_tailq_lookup(const char *name)
+{
+	unsigned i;
+	struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
+
+	if (name == NULL)
+		return NULL;
+
+	for (i = 0; i < RTE_MAX_TAILQ; i++) {
+		if (!strncmp(name, mcfg->tailq_head[i].name,
+			     RTE_TAILQ_NAMESIZE-1))
+			return &mcfg->tailq_head[i];
+	}
+
+	return NULL;
+}
+
+void
+rte_dump_tailq(FILE *f)
+{
+	struct rte_mem_config *mcfg;
+	unsigned i = 0;
+
+	mcfg = rte_eal_get_configuration()->mem_config;
+
+	rte_rwlock_read_lock(&mcfg->qlock);
+	for (i = 0; i < RTE_MAX_TAILQ; i++) {
+		const struct rte_tailq_head *tailq = &mcfg->tailq_head[i];
+		const struct rte_tailq_entry_head *head = &tailq->tailq_head;
+
+		fprintf(f, "Tailq %u: qname:<%s>, tqh_first:%p, tqh_last:%p\n",
+			i, tailq->name, head->tqh_first, head->tqh_last);
+	}
+	rte_rwlock_read_unlock(&mcfg->qlock);
+}
+
+static struct rte_tailq_head *
+rte_eal_tailq_create(const char *name)
+{
+	struct rte_tailq_head *head = NULL;
+
+	if (!rte_eal_tailq_lookup(name) &&
+	    (rte_tailqs_count + 1 < RTE_MAX_TAILQ)) {
+		struct rte_mem_config *mcfg;
+
+		mcfg = rte_eal_get_configuration()->mem_config;
+		head = &mcfg->tailq_head[rte_tailqs_count];
+		snprintf(head->name, sizeof(head->name) - 1, "%s", name);
+		TAILQ_INIT(&head->tailq_head);
+		rte_tailqs_count++;
+	}
+
+	return head;
+}
+
+/* local register, used to store "early" tailqs before rte_eal_init() and to
+ * ensure secondary process only registers tailqs once. */
+static int
+rte_eal_tailq_local_register(struct rte_tailq_elem *t)
+{
+	struct rte_tailq_elem *temp;
+
+	TAILQ_FOREACH(temp, &rte_tailq_elem_head, next) {
+		if (!strncmp(t->name, temp->name, sizeof(temp->name)))
+			return -1;
+	}
+
+	TAILQ_INSERT_TAIL(&rte_tailq_elem_head, t, next);
+	return 0;
+}
+
+static void
+rte_eal_tailq_update(struct rte_tailq_elem *t)
+{
+	if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
+		/* primary process is the only one that creates */
+		t->head = rte_eal_tailq_create(t->name);
+	} else {
+		t->head = rte_eal_tailq_lookup(t->name);
+	}
+}
+
+int
+rte_eal_tailq_register(struct rte_tailq_elem *t)
+{
+	if (rte_eal_tailq_local_register(t) < 0) {
+		RTE_LOG(ERR, EAL,
+			"%s tailq is already registered\n", t->name);
+		goto error;
+	}
+
+	/* if a register happens after rte_eal_tailqs_init(), then we can update
+	 * tailq head */
+	if (rte_tailqs_count >= 0) {
+		rte_eal_tailq_update(t);
+		if (t->head == NULL) {
+			RTE_LOG(ERR, EAL,
+				"Cannot initialize tailq: %s\n", t->name);
+			TAILQ_REMOVE(&rte_tailq_elem_head, t, next);
+			goto error;
+		}
+	}
+
+	return 0;
+
+error:
+	t->head = NULL;
+	return -1;
+}
+
+int
+rte_eal_tailqs_init(void)
+{
+	struct rte_tailq_elem *t;
+
+	rte_tailqs_count = 0;
+
+	TAILQ_FOREACH(t, &rte_tailq_elem_head, next) {
+		/* second part of register job for "early" tailqs, see
+		 * rte_eal_tailq_register and EAL_REGISTER_TAILQ */
+		rte_eal_tailq_update(t);
+		if (t->head == NULL) {
+			RTE_LOG(ERR, EAL,
+				"Cannot initialize tailq: %s\n", t->name);
+			/* no need to TAILQ_REMOVE, we are going to panic in
+			 * rte_eal_init() */
+			goto fail;
+		}
+	}
+
+	return 0;
+
+fail:
+	rte_dump_tailq(stderr);
+	return -1;
+}