Provided by: dpdk-doc_24.11.2-2_all 
NAME
rte_reorder.h
SYNOPSIS
#include <rte_compat.h>
#include <rte_mbuf.h>
#include <rte_mbuf_dyn.h>
Functions
static __rte_experimental rte_reorder_seqn_t * rte_reorder_seqn (struct rte_mbuf *mbuf)
struct rte_reorder_buffer * rte_reorder_create (const char *name, unsigned socket_id, unsigned int size)
struct rte_reorder_buffer * rte_reorder_init (struct rte_reorder_buffer *b, unsigned int bufsize, const
char *name, unsigned int size)
struct rte_reorder_buffer * rte_reorder_find_existing (const char *name)
void rte_reorder_reset (struct rte_reorder_buffer *b)
void rte_reorder_free (struct rte_reorder_buffer *b)
int rte_reorder_insert (struct rte_reorder_buffer *b, struct rte_mbuf *mbuf)
unsigned int rte_reorder_drain (struct rte_reorder_buffer *b, struct rte_mbuf **mbufs, unsigned
max_mbufs)
__rte_experimental unsigned int rte_reorder_drain_up_to_seqn (struct rte_reorder_buffer *b, struct
rte_mbuf **mbufs, unsigned int max_mbufs, rte_reorder_seqn_t seqn)
__rte_experimental unsigned int rte_reorder_min_seqn_set (struct rte_reorder_buffer *b,
rte_reorder_seqn_t min_seqn)
__rte_experimental unsigned int rte_reorder_memory_footprint_get (unsigned int size)
Detailed Description
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.
Definition in file rte_reorder.h.
Function Documentation
static __rte_experimental rte_reorder_seqn_t * rte_reorder_seqn (struct rte_mbuf * mbuf) [inline], [static]
Warning
EXPERIMENTAL: this API may change without prior notice
Read reorder sequence number from mbuf.
Parameters
mbuf Structure to read from.
Returns
pointer to reorder sequence number.
Definition at line 41 of file rte_reorder.h.
struct rte_reorder_buffer * rte_reorder_create (const char * name, unsigned socket_id, unsigned int size)
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
Parameters
name The name to be given to the reorder buffer instance.
socket_id The NUMA node on which the memory for the reorder buffer instance is to be reserved.
size Max number of elements that can be stored in the reorder buffer
Returns
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_init (struct rte_reorder_buffer * b, unsigned int bufsize, const char
* name, unsigned int size)
Initializes given reorder buffer instance
Parameters
b Reorder buffer instance to initialize
bufsize Size of the reorder buffer
name The name to be given to the reorder buffer
size Number of elements that can be stored in reorder buffer
Returns
The initialized reorder buffer instance, or NULL on error On error case, rte_errno will be set
appropriately:
• EINVAL - invalid parameters
• ENOMEM - not enough memory to register dynamic field
struct rte_reorder_buffer * rte_reorder_find_existing (const char * name)
Find an existing reorder buffer instance and return a pointer to it.
Parameters
name Name of the reorder buffer instance as passed to rte_reorder_create()
Returns
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
void rte_reorder_reset (struct rte_reorder_buffer * b)
Reset the given reorder buffer instance with initial values.
Parameters
b Reorder buffer instance which has to be reset
void rte_reorder_free (struct rte_reorder_buffer * b)
Free reorder buffer instance.
Parameters
b Pointer to reorder buffer instance. If b is NULL, no operation is performed.
int rte_reorder_insert (struct rte_reorder_buffer * b, struct rte_mbuf * mbuf)
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.
Parameters
b Reorder buffer where the mbuf has to be inserted.
mbuf mbuf of packet that needs to be inserted in reorder buffer.
Returns
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.
unsigned int rte_reorder_drain (struct rte_reorder_buffer * b, struct rte_mbuf ** mbufs, unsigned max_mbufs)
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.
Parameters
b Reorder buffer instance from which packets are to be drained
mbufs array of mbufs where reordered packets will be inserted from reorder buffer
max_mbufs the number of elements in the mbufs array.
Returns
number of mbuf pointers written to mbufs. 0 <= N < max_mbufs.
__rte_experimental unsigned int rte_reorder_drain_up_to_seqn (struct rte_reorder_buffer * b, struct rte_mbuf
** mbufs, unsigned int max_mbufs, rte_reorder_seqn_t seqn)
Warning
EXPERIMENTAL: this API may change without prior notice
Fetch set of reordered packets up to specified sequence number (exclusive).
Returns a set of in-order packets from the reorder buffer structure. Gaps may be present since reorder
buffer will try to fetch all possible packets up to given sequence number.
Parameters
b Reorder buffer instance from which packets are to be drained.
mbufs Array of mbufs where reordered packets will be inserted from reorder buffer.
max_mbufs The number of elements in the mbuf array.
seqn Sequence number up to which buffer will be drained.
Returns
Number of mbuf pointers written to mbufs. 0 <= N < max_mbufs.
__rte_experimental unsigned int rte_reorder_min_seqn_set (struct rte_reorder_buffer * b, rte_reorder_seqn_t
min_seqn)
Warning
EXPERIMENTAL: this API may change without prior notice
Set minimum sequence number of packet allowed to be buffered. To successfully set new value, reorder
buffer has to be empty (after create, reset or drain_all).
Parameters
b Empty reorder buffer instance to modify.
min_seqn New sequence number to set.
Returns
0 on success, a negative value otherwise.
__rte_experimental unsigned int rte_reorder_memory_footprint_get (unsigned int size)
Warning
EXPERIMENTAL: this API may change without prior notice
Determine the amount of memory needed by the reorder buffer to accommodate a given number of elements.
See also
rte_reorder_init()
Parameters
size Number of elements that can be stored in reorder buffer.
Returns
Reorder buffer footprint measured in bytes.
Author
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DPDK Version 24.11.2 rte_reorder.h(3)