rte_reorder.h File Reference

Functions
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)

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.

Function Documentation

struct rte_reorder_buffer* rte_reorder_create ( const char *  name, unsigned  socket_id, unsigned int  size  )

read

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

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.

struct rte_reorder_buffer* rte_reorder_find_existing ( const char *  name )

read

Find an existing reorder buffer instance and return a pointer to it.

Parameters

name	Name of the reorder buffer instacne 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_free

(

struct rte_reorder_buffer *

b

)

Free reorder buffer instance.

Parameters

b	reorder buffer instance

Returns

None

struct rte_reorder_buffer* rte_reorder_init ( struct rte_reorder_buffer *  b, unsigned int  bufsize, const char *  name, unsigned int  size  )

read

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

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 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.

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