--- /dev/null
+/*-
+ * 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.
+ */
+
+#ifndef _RTE_REORDER_H_
+#define _RTE_REORDER_H_
+
+/**
+ * @file
+ * RTE reorder
+ *
+ * Reorder library is a component which is designed to
+ * provide ordering of out of ordered packets based on
+ * sequence number present in mbuf.
+ *
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct rte_reorder_buffer;
+
+/**
+ * Create a new reorder buffer instance
+ *
+ * Allocate memory and initialize a new reorder buffer in that
+ * memory, returning the reorder buffer pointer to the user
+ *
+ * @param name
+ * The name to be given to the reorder buffer instance.
+ * @param socket_id
+ * The NUMA node on which the memory for the reorder buffer
+ * instance is to be reserved.
+ * @param size
+ * Max number of elements that can be stored in the reorder buffer
+ * @return
+ * The initialized reorder buffer instance, or NULL on error
+ * On error case, rte_errno will be set appropriately:
+ * - ENOMEM - no appropriate memory area found in which to create memzone
+ * - EINVAL - invalid parameters
+ */
+struct rte_reorder_buffer *
+rte_reorder_create(const char *name, unsigned socket_id, unsigned int size);
+
+/**
+ * Initializes given reorder buffer instance
+ *
+ * @param b
+ * Reorder buffer instance to initialize
+ * @param bufsize
+ * Size of the reorder buffer
+ * @param name
+ * The name to be given to the reorder buffer
+ * @param size
+ * Number of elements that can be stored in reorder buffer
+ * @return
+ * The initialized reorder buffer instance, or NULL on error
+ * On error case, rte_errno will be set appropriately:
+ * - EINVAL - invalid parameters
+ */
+struct rte_reorder_buffer *
+rte_reorder_init(struct rte_reorder_buffer *b, unsigned int bufsize,
+ const char *name, unsigned int size);
+
+/**
+ * Find an existing reorder buffer instance
+ * and return a pointer to it.
+ *
+ * @param name
+ * Name of the reorder buffer instacne as passed to rte_reorder_create()
+ * @return
+ * Pointer to reorder buffer instance or NULL if object not found with rte_errno
+ * set appropriately. Possible rte_errno values include:
+ * - ENOENT - required entry not available to return.
+ * reorder instance list
+ */
+struct rte_reorder_buffer *
+rte_reorder_find_existing(const char *name);
+
+/**
+ * Reset the given reorder buffer instance with initial values.
+ *
+ * @param b
+ * Reorder buffer instance which has to be reset
+ */
+void
+rte_reorder_reset(struct rte_reorder_buffer *b);
+
+/**
+ * Free reorder buffer instance.
+ *
+ * @param b
+ * reorder buffer instance
+ * @return
+ * None
+ */
+void
+rte_reorder_free(struct rte_reorder_buffer *b);
+
+/**
+ * Insert given mbuf in reorder buffer in its correct position
+ *
+ * The given mbuf is to be reordered relative to other mbufs in the system.
+ * The mbuf must contain a sequence number which is then used to place
+ * the buffer in the correct position in the reorder buffer. Reordered
+ * packets can later be taken from the buffer using the rte_reorder_drain()
+ * API.
+ *
+ * @param b
+ * Reorder buffer where the mbuf has to be inserted.
+ * @param mbuf
+ * mbuf of packet that needs to be inserted in reorder buffer.
+ * @return
+ * 0 on success
+ * -1 on error
+ * On error case, rte_errno will be set appropriately:
+ * - ENOSPC - Cannot move existing mbufs from reorder buffer to accommodate
+ * ealry mbuf, but it can be accomodated by performing drain and then insert.
+ * - ERANGE - Too early or late mbuf which is vastly out of range of expected
+ * window should be ingnored without any handling.
+ */
+int
+rte_reorder_insert(struct rte_reorder_buffer *b, struct rte_mbuf *mbuf);
+
+/**
+ * Fetch reordered buffers
+ *
+ * Returns a set of in-order buffers from the reorder buffer structure. Gaps
+ * may be present in the sequence numbers of the mbuf if packets have been
+ * delayed too long before reaching the reorder window, or have been previously
+ * dropped by the system.
+ *
+ * @param b
+ * Reorder buffer instance from which packets are to be drained
+ * @param mbufs
+ * array of mbufs where reordered packets will be inserted from reorder buffer
+ * @param max_mbufs
+ * the number of elements in the mbufs array.
+ * @return
+ * number of mbuf pointers written to mbufs. 0 <= N < max_mbufs.
+ */
+unsigned int
+rte_reorder_drain(struct rte_reorder_buffer *b, struct rte_mbuf **mbufs,
+ unsigned max_mbufs);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_REORDER_H_ */
Code Review / deb_dpdk.git / blobdiff