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/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2017 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 _GSO_TCP4_H_
#define _GSO_TCP4_H_

#include <stdint.h>
#include <rte_mbuf.h>

/**
 * Segment an IPv4/TCP packet. This function doesn't check if the input
 * packet has correct checksums, and doesn't update checksums for output
 * GSO segments. Furthermore, it doesn't process IP fragment packets.
 *
 * @param pkt
 *  The packet mbuf to segment.
 * @param gso_size
 *  The max length of a GSO segment, measured in bytes.
 * @param ipid_delta
 *  The increasing unit of IP ids.
 * @param direct_pool
 *  MBUF pool used for allocating direct buffers for output segments.
 * @param indirect_pool
 *  MBUF pool used for allocating indirect buffers for output segments.
 * @param pkts_out
 *  Pointer array used to store the MBUF addresses of output GSO
 *  segments, when the function succeeds. If the memory space in
 *  pkts_out is insufficient, it fails and returns -EINVAL.
 * @param nb_pkts_out
 *  The max number of items that 'pkts_out' can keep.
 *
 * @return
 *   - The number of GSO segments filled in pkts_out on success.
 *   - Return -ENOMEM if run out of memory in MBUF pools.
 *   - Return -EINVAL for invalid parameters.
 */
int gso_tcp4_segment(struct rte_mbuf *pkt,
		uint16_t gso_size,
		uint8_t ip_delta,
		struct rte_mempool *direct_pool,
		struct rte_mempool *indirect_pool,
		struct rte_mbuf **pkts_out,
		uint16_t nb_pkts_out);
#endif