--- /dev/null
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2015 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.
+ */
+
+/*
+ * Derived from FreeBSD's bufring.c
+ *
+ **************************************************************************
+ *
+ * Copyright (c) 2007,2008 Kip Macy kmacy@freebsd.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. The name of Kip Macy nor the names of other
+ * 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 <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/queue.h>
+
+#include <rte_common.h>
+#include <rte_log.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_malloc.h>
+#include <rte_launch.h>
+#include <rte_eal.h>
+#include <rte_eal_memconfig.h>
+#include <rte_atomic.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_branch_prediction.h>
+#include <rte_errno.h>
+#include <rte_string_fns.h>
+#include <rte_spinlock.h>
+
+#include "rte_ring.h"
+
+TAILQ_HEAD(rte_ring_list, rte_tailq_entry);
+
+static struct rte_tailq_elem rte_ring_tailq = {
+ .name = RTE_TAILQ_RING_NAME,
+};
+EAL_REGISTER_TAILQ(rte_ring_tailq)
+
+/* true if x is a power of 2 */
+#define POWEROF2(x) ((((x)-1) & (x)) == 0)
+
+/* return the size of memory occupied by a ring */
+ssize_t
+rte_ring_get_memsize(unsigned count)
+{
+ ssize_t sz;
+
+ /* count must be a power of 2 */
+ if ((!POWEROF2(count)) || (count > RTE_RING_SZ_MASK )) {
+ RTE_LOG(ERR, RING,
+ "Requested size is invalid, must be power of 2, and "
+ "do not exceed the size limit %u\n", RTE_RING_SZ_MASK);
+ return -EINVAL;
+ }
+
+ sz = sizeof(struct rte_ring) + count * sizeof(void *);
+ sz = RTE_ALIGN(sz, RTE_CACHE_LINE_SIZE);
+ return sz;
+}
+
+int
+rte_ring_init(struct rte_ring *r, const char *name, unsigned count,
+ unsigned flags)
+{
+ /* compilation-time checks */
+ RTE_BUILD_BUG_ON((sizeof(struct rte_ring) &
+ RTE_CACHE_LINE_MASK) != 0);
+#ifdef RTE_RING_SPLIT_PROD_CONS
+ RTE_BUILD_BUG_ON((offsetof(struct rte_ring, cons) &
+ RTE_CACHE_LINE_MASK) != 0);
+#endif
+ RTE_BUILD_BUG_ON((offsetof(struct rte_ring, prod) &
+ RTE_CACHE_LINE_MASK) != 0);
+#ifdef RTE_LIBRTE_RING_DEBUG
+ RTE_BUILD_BUG_ON((sizeof(struct rte_ring_debug_stats) &
+ RTE_CACHE_LINE_MASK) != 0);
+ RTE_BUILD_BUG_ON((offsetof(struct rte_ring, stats) &
+ RTE_CACHE_LINE_MASK) != 0);
+#endif
+
+ /* init the ring structure */
+ memset(r, 0, sizeof(*r));
+ snprintf(r->name, sizeof(r->name), "%s", name);
+ r->flags = flags;
+ r->prod.watermark = count;
+ r->prod.sp_enqueue = !!(flags & RING_F_SP_ENQ);
+ r->cons.sc_dequeue = !!(flags & RING_F_SC_DEQ);
+ r->prod.size = r->cons.size = count;
+ r->prod.mask = r->cons.mask = count-1;
+ r->prod.head = r->cons.head = 0;
+ r->prod.tail = r->cons.tail = 0;
+
+ return 0;
+}
+
+/* create the ring */
+struct rte_ring *
+rte_ring_create(const char *name, unsigned count, int socket_id,
+ unsigned flags)
+{
+ char mz_name[RTE_MEMZONE_NAMESIZE];
+ struct rte_ring *r;
+ struct rte_tailq_entry *te;
+ const struct rte_memzone *mz;
+ ssize_t ring_size;
+ int mz_flags = 0;
+ struct rte_ring_list* ring_list = NULL;
+
+ ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+
+ ring_size = rte_ring_get_memsize(count);
+ if (ring_size < 0) {
+ rte_errno = ring_size;
+ return NULL;
+ }
+
+ te = rte_zmalloc("RING_TAILQ_ENTRY", sizeof(*te), 0);
+ if (te == NULL) {
+ RTE_LOG(ERR, RING, "Cannot reserve memory for tailq\n");
+ rte_errno = ENOMEM;
+ return NULL;
+ }
+
+ snprintf(mz_name, sizeof(mz_name), "%s%s", RTE_RING_MZ_PREFIX, name);
+
+ rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+
+ /* reserve a memory zone for this ring. If we can't get rte_config or
+ * we are secondary process, the memzone_reserve function will set
+ * rte_errno for us appropriately - hence no check in this this function */
+ mz = rte_memzone_reserve(mz_name, ring_size, socket_id, mz_flags);
+ if (mz != NULL) {
+ r = mz->addr;
+ /* no need to check return value here, we already checked the
+ * arguments above */
+ rte_ring_init(r, name, count, flags);
+
+ te->data = (void *) r;
+ r->memzone = mz;
+
+ TAILQ_INSERT_TAIL(ring_list, te, next);
+ } else {
+ r = NULL;
+ RTE_LOG(ERR, RING, "Cannot reserve memory\n");
+ rte_free(te);
+ }
+ rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+ return r;
+}
+
+/* free the ring */
+void
+rte_ring_free(struct rte_ring *r)
+{
+ struct rte_ring_list *ring_list = NULL;
+ struct rte_tailq_entry *te;
+
+ if (r == NULL)
+ return;
+
+ /*
+ * Ring was not created with rte_ring_create,
+ * therefore, there is no memzone to free.
+ */
+ if (r->memzone == NULL) {
+ RTE_LOG(ERR, RING, "Cannot free ring (not created with rte_ring_create()");
+ return;
+ }
+
+ if (rte_memzone_free(r->memzone) != 0) {
+ RTE_LOG(ERR, RING, "Cannot free memory\n");
+ return;
+ }
+
+ ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+ rte_rwlock_write_lock(RTE_EAL_TAILQ_RWLOCK);
+
+ /* find out tailq entry */
+ TAILQ_FOREACH(te, ring_list, next) {
+ if (te->data == (void *) r)
+ break;
+ }
+
+ if (te == NULL) {
+ rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+ return;
+ }
+
+ TAILQ_REMOVE(ring_list, te, next);
+
+ rte_rwlock_write_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+ rte_free(te);
+}
+
+/*
+ * change the high water mark. If *count* is 0, water marking is
+ * disabled
+ */
+int
+rte_ring_set_water_mark(struct rte_ring *r, unsigned count)
+{
+ if (count >= r->prod.size)
+ return -EINVAL;
+
+ /* if count is 0, disable the watermarking */
+ if (count == 0)
+ count = r->prod.size;
+
+ r->prod.watermark = count;
+ return 0;
+}
+
+/* dump the status of the ring on the console */
+void
+rte_ring_dump(FILE *f, const struct rte_ring *r)
+{
+#ifdef RTE_LIBRTE_RING_DEBUG
+ struct rte_ring_debug_stats sum;
+ unsigned lcore_id;
+#endif
+
+ fprintf(f, "ring <%s>@%p\n", r->name, r);
+ fprintf(f, " flags=%x\n", r->flags);
+ fprintf(f, " size=%"PRIu32"\n", r->prod.size);
+ fprintf(f, " ct=%"PRIu32"\n", r->cons.tail);
+ fprintf(f, " ch=%"PRIu32"\n", r->cons.head);
+ fprintf(f, " pt=%"PRIu32"\n", r->prod.tail);
+ fprintf(f, " ph=%"PRIu32"\n", r->prod.head);
+ fprintf(f, " used=%u\n", rte_ring_count(r));
+ fprintf(f, " avail=%u\n", rte_ring_free_count(r));
+ if (r->prod.watermark == r->prod.size)
+ fprintf(f, " watermark=0\n");
+ else
+ fprintf(f, " watermark=%"PRIu32"\n", r->prod.watermark);
+
+ /* sum and dump statistics */
+#ifdef RTE_LIBRTE_RING_DEBUG
+ memset(&sum, 0, sizeof(sum));
+ for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++) {
+ sum.enq_success_bulk += r->stats[lcore_id].enq_success_bulk;
+ sum.enq_success_objs += r->stats[lcore_id].enq_success_objs;
+ sum.enq_quota_bulk += r->stats[lcore_id].enq_quota_bulk;
+ sum.enq_quota_objs += r->stats[lcore_id].enq_quota_objs;
+ sum.enq_fail_bulk += r->stats[lcore_id].enq_fail_bulk;
+ sum.enq_fail_objs += r->stats[lcore_id].enq_fail_objs;
+ sum.deq_success_bulk += r->stats[lcore_id].deq_success_bulk;
+ sum.deq_success_objs += r->stats[lcore_id].deq_success_objs;
+ sum.deq_fail_bulk += r->stats[lcore_id].deq_fail_bulk;
+ sum.deq_fail_objs += r->stats[lcore_id].deq_fail_objs;
+ }
+ fprintf(f, " size=%"PRIu32"\n", r->prod.size);
+ fprintf(f, " enq_success_bulk=%"PRIu64"\n", sum.enq_success_bulk);
+ fprintf(f, " enq_success_objs=%"PRIu64"\n", sum.enq_success_objs);
+ fprintf(f, " enq_quota_bulk=%"PRIu64"\n", sum.enq_quota_bulk);
+ fprintf(f, " enq_quota_objs=%"PRIu64"\n", sum.enq_quota_objs);
+ fprintf(f, " enq_fail_bulk=%"PRIu64"\n", sum.enq_fail_bulk);
+ fprintf(f, " enq_fail_objs=%"PRIu64"\n", sum.enq_fail_objs);
+ fprintf(f, " deq_success_bulk=%"PRIu64"\n", sum.deq_success_bulk);
+ fprintf(f, " deq_success_objs=%"PRIu64"\n", sum.deq_success_objs);
+ fprintf(f, " deq_fail_bulk=%"PRIu64"\n", sum.deq_fail_bulk);
+ fprintf(f, " deq_fail_objs=%"PRIu64"\n", sum.deq_fail_objs);
+#else
+ fprintf(f, " no statistics available\n");
+#endif
+}
+
+/* dump the status of all rings on the console */
+void
+rte_ring_list_dump(FILE *f)
+{
+ const struct rte_tailq_entry *te;
+ struct rte_ring_list *ring_list;
+
+ ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+
+ rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
+
+ TAILQ_FOREACH(te, ring_list, next) {
+ rte_ring_dump(f, (struct rte_ring *) te->data);
+ }
+
+ rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
+}
+
+/* search a ring from its name */
+struct rte_ring *
+rte_ring_lookup(const char *name)
+{
+ struct rte_tailq_entry *te;
+ struct rte_ring *r = NULL;
+ struct rte_ring_list *ring_list;
+
+ ring_list = RTE_TAILQ_CAST(rte_ring_tailq.head, rte_ring_list);
+
+ rte_rwlock_read_lock(RTE_EAL_TAILQ_RWLOCK);
+
+ TAILQ_FOREACH(te, ring_list, next) {
+ r = (struct rte_ring *) te->data;
+ if (strncmp(name, r->name, RTE_RING_NAMESIZE) == 0)
+ break;
+ }
+
+ rte_rwlock_read_unlock(RTE_EAL_TAILQ_RWLOCK);
+
+ if (te == NULL) {
+ rte_errno = ENOENT;
+ return NULL;
+ }
+
+ return r;
+}
Code Review / deb_dpdk.git / blobdiff