Imported Upstream version 16.07-rc1

[deb_dpdk.git] / lib / librte_mempool / rte_mempool_ops.c

diff --git a/lib/librte_mempool/rte_mempool_ops.c b/lib/librte_mempool/rte_mempool_ops.c
new file mode 100644 (file)
index 0000000..fd0b64c
--- /dev/null
+++ b/lib/librte_mempool/rte_mempool_ops.c
@@ -0,0 +1,151 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 Intel Corporation. All rights reserved.
+ *   Copyright(c) 2016 6WIND S.A.
+ *   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 <stdio.h>
+#include <string.h>
+
+#include <rte_mempool.h>
+#include <rte_errno.h>
+
+/* indirect jump table to support external memory pools. */
+struct rte_mempool_ops_table rte_mempool_ops_table = {
+       .sl =  RTE_SPINLOCK_INITIALIZER,
+       .num_ops = 0
+};
+
+/* add a new ops struct in rte_mempool_ops_table, return its index. */
+int
+rte_mempool_register_ops(const struct rte_mempool_ops *h)
+{
+       struct rte_mempool_ops *ops;
+       int16_t ops_index;
+
+       rte_spinlock_lock(&rte_mempool_ops_table.sl);
+
+       if (rte_mempool_ops_table.num_ops >=
+                       RTE_MEMPOOL_MAX_OPS_IDX) {
+               rte_spinlock_unlock(&rte_mempool_ops_table.sl);
+               RTE_LOG(ERR, MEMPOOL,
+                       "Maximum number of mempool ops structs exceeded\n");
+               return -ENOSPC;
+       }
+
+       if (h->alloc == NULL || h->enqueue == NULL ||
+                       h->dequeue == NULL || h->get_count == NULL) {
+               rte_spinlock_unlock(&rte_mempool_ops_table.sl);
+               RTE_LOG(ERR, MEMPOOL,
+                       "Missing callback while registering mempool ops\n");
+               return -EINVAL;
+       }
+
+       if (strlen(h->name) >= sizeof(ops->name) - 1) {
+               rte_spinlock_unlock(&rte_mempool_ops_table.sl);
+               RTE_LOG(DEBUG, EAL, "%s(): mempool_ops <%s>: name too long\n",
+                               __func__, h->name);
+               rte_errno = EEXIST;
+               return -EEXIST;
+       }
+
+       ops_index = rte_mempool_ops_table.num_ops++;
+       ops = &rte_mempool_ops_table.ops[ops_index];
+       snprintf(ops->name, sizeof(ops->name), "%s", h->name);
+       ops->alloc = h->alloc;
+       ops->enqueue = h->enqueue;
+       ops->dequeue = h->dequeue;
+       ops->get_count = h->get_count;
+
+       rte_spinlock_unlock(&rte_mempool_ops_table.sl);
+
+       return ops_index;
+}
+
+/* wrapper to allocate an external mempool's private (pool) data. */
+int
+rte_mempool_ops_alloc(struct rte_mempool *mp)
+{
+       struct rte_mempool_ops *ops;
+
+       ops = rte_mempool_get_ops(mp->ops_index);
+       return ops->alloc(mp);
+}
+
+/* wrapper to free an external pool ops. */
+void
+rte_mempool_ops_free(struct rte_mempool *mp)
+{
+       struct rte_mempool_ops *ops;
+
+       ops = rte_mempool_get_ops(mp->ops_index);
+       if (ops->free == NULL)
+               return;
+       ops->free(mp);
+}
+
+/* wrapper to get available objects in an external mempool. */
+unsigned int
+rte_mempool_ops_get_count(const struct rte_mempool *mp)
+{
+       struct rte_mempool_ops *ops;
+
+       ops = rte_mempool_get_ops(mp->ops_index);
+       return ops->get_count(mp);
+}
+
+/* sets mempool ops previously registered by rte_mempool_register_ops. */
+int
+rte_mempool_set_ops_byname(struct rte_mempool *mp, const char *name,
+       void *pool_config)
+{
+       struct rte_mempool_ops *ops = NULL;
+       unsigned i;
+
+       /* too late, the mempool is already populated. */
+       if (mp->flags & MEMPOOL_F_POOL_CREATED)
+               return -EEXIST;
+
+       for (i = 0; i < rte_mempool_ops_table.num_ops; i++) {
+               if (!strcmp(name,
+                               rte_mempool_ops_table.ops[i].name)) {
+                       ops = &rte_mempool_ops_table.ops[i];
+                       break;
+               }
+       }
+
+       if (ops == NULL)
+               return -EINVAL;
+
+       mp->ops_index = i;
+       mp->pool_config = pool_config;
+       return 0;
+}