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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
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