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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#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.
*
*/
#include <rte_mbuf.h>
#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
* early mbuf, but it can be accommodated by performing drain and then insert.
* - ERANGE - Too early or late mbuf which is vastly out of range of expected
* window should be ignored 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_ */
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