Network Buffer Library

Network buffer library. More...

Data Structures
struct	net_buf_simple
	Simple network buffer representation. More...
struct	net_buf_simple_state
	Parsing state of a buffer. More...
struct	net_buf
	Network buffer representation. More...
struct	net_buf_data_cb
struct	net_buf_data_alloc
struct	net_buf_pool
	Network buffer pool representation. More...
struct	net_buf_pool_fixed

Macros
#define	NET_BUF_SIMPLE_DEFINE(_name, _size)
	Define a net_buf_simple stack variable. More...
#define	NET_BUF_SIMPLE_DEFINE_STATIC(_name, _size)
	Define a static net_buf_simple variable. More...
#define	NET_BUF_SIMPLE(_size)
	Define a net_buf_simple stack variable and get a pointer to it. More...
#define	NET_BUF_FRAGS   BIT(0)
#define	NET_BUF_EXTERNAL_DATA   BIT(1)
#define	NET_BUF_POOL_HEAP_DEFINE(_name, _count, _destroy)
	Define a new pool for buffers using the heap for the data. More...
#define	NET_BUF_POOL_FIXED_DEFINE(_name, _count, _data_size, _destroy)
	Define a new pool for buffers based on fixed-size data. More...
#define	NET_BUF_POOL_VAR_DEFINE(_name, _count, _data_size, _destroy)
	Define a new pool for buffers with variable size payloads. More...
#define	NET_BUF_POOL_DEFINE(_name, _count, _size, _ud_size, _destroy)
	Define a new pool for buffers. More...

Typedefs
typedef struct net_buf *(*	net_buf_allocator_cb) (k_timeout_t timeout, void *user_data)
	Network buffer allocator callback. More...

Functions
static void	net_buf_simple_init (struct net_buf_simple *buf, size_t reserve_head)
	Initialize a net_buf_simple object. More...
void	net_buf_simple_init_with_data (struct net_buf_simple *buf, void *data, size_t size)
	Initialize a net_buf_simple object with data. More...
static void	net_buf_simple_reset (struct net_buf_simple *buf)
	Reset buffer. More...
void	net_buf_simple_clone (const struct net_buf_simple *original, struct net_buf_simple *clone)
void *	net_buf_simple_add (struct net_buf_simple *buf, size_t len)
	Prepare data to be added at the end of the buffer. More...
void *	net_buf_simple_add_mem (struct net_buf_simple *buf, const void *mem, size_t len)
	Copy given number of bytes from memory to the end of the buffer. More...
uint8_t *	net_buf_simple_add_u8 (struct net_buf_simple *buf, uint8_t val)
	Add (8-bit) byte at the end of the buffer. More...
void	net_buf_simple_add_le16 (struct net_buf_simple *buf, uint16_t val)
	Add 16-bit value at the end of the buffer. More...
void	net_buf_simple_add_be16 (struct net_buf_simple *buf, uint16_t val)
	Add 16-bit value at the end of the buffer. More...
void	net_buf_simple_add_le24 (struct net_buf_simple *buf, uint32_t val)
	Add 24-bit value at the end of the buffer. More...
void	net_buf_simple_add_be24 (struct net_buf_simple *buf, uint32_t val)
	Add 24-bit value at the end of the buffer. More...
void	net_buf_simple_add_le32 (struct net_buf_simple *buf, uint32_t val)
	Add 32-bit value at the end of the buffer. More...
void	net_buf_simple_add_be32 (struct net_buf_simple *buf, uint32_t val)
	Add 32-bit value at the end of the buffer. More...
void	net_buf_simple_add_le48 (struct net_buf_simple *buf, uint64_t val)
	Add 48-bit value at the end of the buffer. More...
void	net_buf_simple_add_be48 (struct net_buf_simple *buf, uint64_t val)
	Add 48-bit value at the end of the buffer. More...
void	net_buf_simple_add_le64 (struct net_buf_simple *buf, uint64_t val)
	Add 64-bit value at the end of the buffer. More...
void	net_buf_simple_add_be64 (struct net_buf_simple *buf, uint64_t val)
	Add 64-bit value at the end of the buffer. More...
void *	net_buf_simple_remove_mem (struct net_buf_simple *buf, size_t len)
	Remove data from the end of the buffer. More...
uint8_t	net_buf_simple_remove_u8 (struct net_buf_simple *buf)
	Remove a 8-bit value from the end of the buffer. More...
uint16_t	net_buf_simple_remove_le16 (struct net_buf_simple *buf)
	Remove and convert 16 bits from the end of the buffer. More...
uint16_t	net_buf_simple_remove_be16 (struct net_buf_simple *buf)
	Remove and convert 16 bits from the end of the buffer. More...
uint32_t	net_buf_simple_remove_le24 (struct net_buf_simple *buf)
	Remove and convert 24 bits from the end of the buffer. More...
uint32_t	net_buf_simple_remove_be24 (struct net_buf_simple *buf)
	Remove and convert 24 bits from the end of the buffer. More...
uint32_t	net_buf_simple_remove_le32 (struct net_buf_simple *buf)
	Remove and convert 32 bits from the end of the buffer. More...
uint32_t	net_buf_simple_remove_be32 (struct net_buf_simple *buf)
	Remove and convert 32 bits from the end of the buffer. More...
uint64_t	net_buf_simple_remove_le48 (struct net_buf_simple *buf)
	Remove and convert 48 bits from the end of the buffer. More...
uint64_t	net_buf_simple_remove_be48 (struct net_buf_simple *buf)
	Remove and convert 48 bits from the end of the buffer. More...
uint64_t	net_buf_simple_remove_le64 (struct net_buf_simple *buf)
	Remove and convert 64 bits from the end of the buffer. More...
uint64_t	net_buf_simple_remove_be64 (struct net_buf_simple *buf)
	Remove and convert 64 bits from the end of the buffer. More...
void *	net_buf_simple_push (struct net_buf_simple *buf, size_t len)
	Prepare data to be added to the start of the buffer. More...
void *	net_buf_simple_push_mem (struct net_buf_simple *buf, const void *mem, size_t len)
	Copy given number of bytes from memory to the start of the buffer. More...
void	net_buf_simple_push_le16 (struct net_buf_simple *buf, uint16_t val)
	Push 16-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_be16 (struct net_buf_simple *buf, uint16_t val)
	Push 16-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_u8 (struct net_buf_simple *buf, uint8_t val)
	Push 8-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_le24 (struct net_buf_simple *buf, uint32_t val)
	Push 24-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_be24 (struct net_buf_simple *buf, uint32_t val)
	Push 24-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_le32 (struct net_buf_simple *buf, uint32_t val)
	Push 32-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_be32 (struct net_buf_simple *buf, uint32_t val)
	Push 32-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_le48 (struct net_buf_simple *buf, uint64_t val)
	Push 48-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_be48 (struct net_buf_simple *buf, uint64_t val)
	Push 48-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_le64 (struct net_buf_simple *buf, uint64_t val)
	Push 64-bit value to the beginning of the buffer. More...
void	net_buf_simple_push_be64 (struct net_buf_simple *buf, uint64_t val)
	Push 64-bit value to the beginning of the buffer. More...
void *	net_buf_simple_pull (struct net_buf_simple *buf, size_t len)
	Remove data from the beginning of the buffer. More...
void *	net_buf_simple_pull_mem (struct net_buf_simple *buf, size_t len)
	Remove data from the beginning of the buffer. More...
uint8_t	net_buf_simple_pull_u8 (struct net_buf_simple *buf)
	Remove a 8-bit value from the beginning of the buffer. More...
uint16_t	net_buf_simple_pull_le16 (struct net_buf_simple *buf)
	Remove and convert 16 bits from the beginning of the buffer. More...
uint16_t	net_buf_simple_pull_be16 (struct net_buf_simple *buf)
	Remove and convert 16 bits from the beginning of the buffer. More...
uint32_t	net_buf_simple_pull_le24 (struct net_buf_simple *buf)
	Remove and convert 24 bits from the beginning of the buffer. More...
uint32_t	net_buf_simple_pull_be24 (struct net_buf_simple *buf)
	Remove and convert 24 bits from the beginning of the buffer. More...
uint32_t	net_buf_simple_pull_le32 (struct net_buf_simple *buf)
	Remove and convert 32 bits from the beginning of the buffer. More...
uint32_t	net_buf_simple_pull_be32 (struct net_buf_simple *buf)
	Remove and convert 32 bits from the beginning of the buffer. More...
uint64_t	net_buf_simple_pull_le48 (struct net_buf_simple *buf)
	Remove and convert 48 bits from the beginning of the buffer. More...
uint64_t	net_buf_simple_pull_be48 (struct net_buf_simple *buf)
	Remove and convert 48 bits from the beginning of the buffer. More...
uint64_t	net_buf_simple_pull_le64 (struct net_buf_simple *buf)
	Remove and convert 64 bits from the beginning of the buffer. More...
uint64_t	net_buf_simple_pull_be64 (struct net_buf_simple *buf)
	Remove and convert 64 bits from the beginning of the buffer. More...
static uint8_t *	net_buf_simple_tail (struct net_buf_simple *buf)
	Get the tail pointer for a buffer. More...
size_t	net_buf_simple_headroom (struct net_buf_simple *buf)
	Check buffer headroom. More...
size_t	net_buf_simple_tailroom (struct net_buf_simple *buf)
	Check buffer tailroom. More...
uint16_t	net_buf_simple_max_len (struct net_buf_simple *buf)
	Check maximum net_buf_simple::len value. More...
static void	net_buf_simple_save (struct net_buf_simple *buf, struct net_buf_simple_state *state)
	Save the parsing state of a buffer. More...
static void	net_buf_simple_restore (struct net_buf_simple *buf, struct net_buf_simple_state *state)
	Restore the parsing state of a buffer. More...
struct net_buf_pool *	net_buf_pool_get (int id)
	Looks up a pool based on its ID. More...
int	net_buf_id (struct net_buf *buf)
	Get a zero-based index for a buffer. More...
struct net_buf *	net_buf_alloc_fixed (struct net_buf_pool *pool, k_timeout_t timeout)
	Allocate a new fixed buffer from a pool. More...
static struct net_buf *	net_buf_alloc (struct net_buf_pool *pool, k_timeout_t timeout)
struct net_buf *	net_buf_alloc_len (struct net_buf_pool *pool, size_t size, k_timeout_t timeout)
	Allocate a new variable length buffer from a pool. More...
struct net_buf *	net_buf_alloc_with_data (struct net_buf_pool *pool, void *data, size_t size, k_timeout_t timeout)
	Allocate a new buffer from a pool but with external data pointer. More...
struct net_buf *	net_buf_get (struct k_fifo *fifo, k_timeout_t timeout)
	Get a buffer from a FIFO. More...
static void	net_buf_destroy (struct net_buf *buf)
	Destroy buffer from custom destroy callback. More...
void	net_buf_reset (struct net_buf *buf)
	Reset buffer. More...
void	net_buf_simple_reserve (struct net_buf_simple *buf, size_t reserve)
	Initialize buffer with the given headroom. More...
void	net_buf_slist_put (sys_slist_t *list, struct net_buf *buf)
	Put a buffer into a list. More...
struct net_buf *	net_buf_slist_get (sys_slist_t *list)
	Get a buffer from a list. More...
void	net_buf_put (struct k_fifo *fifo, struct net_buf *buf)
	Put a buffer to the end of a FIFO. More...
void	net_buf_unref (struct net_buf *buf)
	Decrements the reference count of a buffer. More...
struct net_buf *	net_buf_ref (struct net_buf *buf)
	Increment the reference count of a buffer. More...
struct net_buf *	net_buf_clone (struct net_buf *buf, k_timeout_t timeout)
	Clone buffer. More...
static void *	net_buf_user_data (const struct net_buf *buf)
	Get a pointer to the user data of a buffer. More...
static void	net_buf_reserve (struct net_buf *buf, size_t reserve)
	Initialize buffer with the given headroom. More...
static void *	net_buf_add (struct net_buf *buf, size_t len)
	Prepare data to be added at the end of the buffer. More...
static void *	net_buf_add_mem (struct net_buf *buf, const void *mem, size_t len)
	Copies the given number of bytes to the end of the buffer. More...
static uint8_t *	net_buf_add_u8 (struct net_buf *buf, uint8_t val)
	Add (8-bit) byte at the end of the buffer. More...
static void	net_buf_add_le16 (struct net_buf *buf, uint16_t val)
	Add 16-bit value at the end of the buffer. More...
static void	net_buf_add_be16 (struct net_buf *buf, uint16_t val)
	Add 16-bit value at the end of the buffer. More...
static void	net_buf_add_le24 (struct net_buf *buf, uint32_t val)
	Add 24-bit value at the end of the buffer. More...
static void	net_buf_add_be24 (struct net_buf *buf, uint32_t val)
	Add 24-bit value at the end of the buffer. More...
static void	net_buf_add_le32 (struct net_buf *buf, uint32_t val)
	Add 32-bit value at the end of the buffer. More...
static void	net_buf_add_be32 (struct net_buf *buf, uint32_t val)
	Add 32-bit value at the end of the buffer. More...
static void	net_buf_add_le48 (struct net_buf *buf, uint64_t val)
	Add 48-bit value at the end of the buffer. More...
static void	net_buf_add_be48 (struct net_buf *buf, uint64_t val)
	Add 48-bit value at the end of the buffer. More...
static void	net_buf_add_le64 (struct net_buf *buf, uint64_t val)
	Add 64-bit value at the end of the buffer. More...
static void	net_buf_add_be64 (struct net_buf *buf, uint64_t val)
	Add 64-bit value at the end of the buffer. More...
static void *	net_buf_remove_mem (struct net_buf *buf, size_t len)
	Remove data from the end of the buffer. More...
static uint8_t	net_buf_remove_u8 (struct net_buf *buf)
	Remove a 8-bit value from the end of the buffer. More...
static uint16_t	net_buf_remove_le16 (struct net_buf *buf)
	Remove and convert 16 bits from the end of the buffer. More...
static uint16_t	net_buf_remove_be16 (struct net_buf *buf)
	Remove and convert 16 bits from the end of the buffer. More...
static uint32_t	net_buf_remove_be24 (struct net_buf *buf)
	Remove and convert 24 bits from the end of the buffer. More...
static uint32_t	net_buf_remove_le24 (struct net_buf *buf)
	Remove and convert 24 bits from the end of the buffer. More...
static uint32_t	net_buf_remove_le32 (struct net_buf *buf)
	Remove and convert 32 bits from the end of the buffer. More...
static uint32_t	net_buf_remove_be32 (struct net_buf *buf)
	Remove and convert 32 bits from the end of the buffer. More...
static uint64_t	net_buf_remove_le48 (struct net_buf *buf)
	Remove and convert 48 bits from the end of the buffer. More...
static uint64_t	net_buf_remove_be48 (struct net_buf *buf)
	Remove and convert 48 bits from the end of the buffer. More...
static uint64_t	net_buf_remove_le64 (struct net_buf *buf)
	Remove and convert 64 bits from the end of the buffer. More...
static uint64_t	net_buf_remove_be64 (struct net_buf *buf)
	Remove and convert 64 bits from the end of the buffer. More...
static void *	net_buf_push (struct net_buf *buf, size_t len)
	Prepare data to be added at the start of the buffer. More...
static void *	net_buf_push_mem (struct net_buf *buf, const void *mem, size_t len)
	Copies the given number of bytes to the start of the buffer. More...
static void	net_buf_push_u8 (struct net_buf *buf, uint8_t val)
	Push 8-bit value to the beginning of the buffer. More...
static void	net_buf_push_le16 (struct net_buf *buf, uint16_t val)
	Push 16-bit value to the beginning of the buffer. More...
static void	net_buf_push_be16 (struct net_buf *buf, uint16_t val)
	Push 16-bit value to the beginning of the buffer. More...
static void	net_buf_push_le24 (struct net_buf *buf, uint32_t val)
	Push 24-bit value to the beginning of the buffer. More...
static void	net_buf_push_be24 (struct net_buf *buf, uint32_t val)
	Push 24-bit value to the beginning of the buffer. More...
static void	net_buf_push_le32 (struct net_buf *buf, uint32_t val)
	Push 32-bit value to the beginning of the buffer. More...
static void	net_buf_push_be32 (struct net_buf *buf, uint32_t val)
	Push 32-bit value to the beginning of the buffer. More...
static void	net_buf_push_le48 (struct net_buf *buf, uint64_t val)
	Push 48-bit value to the beginning of the buffer. More...
static void	net_buf_push_be48 (struct net_buf *buf, uint64_t val)
	Push 48-bit value to the beginning of the buffer. More...
static void	net_buf_push_le64 (struct net_buf *buf, uint64_t val)
	Push 64-bit value to the beginning of the buffer. More...
static void	net_buf_push_be64 (struct net_buf *buf, uint64_t val)
	Push 64-bit value to the beginning of the buffer. More...
static void *	net_buf_pull (struct net_buf *buf, size_t len)
	Remove data from the beginning of the buffer. More...
static void *	net_buf_pull_mem (struct net_buf *buf, size_t len)
	Remove data from the beginning of the buffer. More...
static uint8_t	net_buf_pull_u8 (struct net_buf *buf)
	Remove a 8-bit value from the beginning of the buffer. More...
static uint16_t	net_buf_pull_le16 (struct net_buf *buf)
	Remove and convert 16 bits from the beginning of the buffer. More...
static uint16_t	net_buf_pull_be16 (struct net_buf *buf)
	Remove and convert 16 bits from the beginning of the buffer. More...
static uint32_t	net_buf_pull_le24 (struct net_buf *buf)
	Remove and convert 24 bits from the beginning of the buffer. More...
static uint32_t	net_buf_pull_be24 (struct net_buf *buf)
	Remove and convert 24 bits from the beginning of the buffer. More...
static uint32_t	net_buf_pull_le32 (struct net_buf *buf)
	Remove and convert 32 bits from the beginning of the buffer. More...
static uint32_t	net_buf_pull_be32 (struct net_buf *buf)
	Remove and convert 32 bits from the beginning of the buffer. More...
static uint64_t	net_buf_pull_le48 (struct net_buf *buf)
	Remove and convert 48 bits from the beginning of the buffer. More...
static uint64_t	net_buf_pull_be48 (struct net_buf *buf)
	Remove and convert 48 bits from the beginning of the buffer. More...
static uint64_t	net_buf_pull_le64 (struct net_buf *buf)
	Remove and convert 64 bits from the beginning of the buffer. More...
static uint64_t	net_buf_pull_be64 (struct net_buf *buf)
	Remove and convert 64 bits from the beginning of the buffer. More...
static size_t	net_buf_tailroom (struct net_buf *buf)
	Check buffer tailroom. More...
static size_t	net_buf_headroom (struct net_buf *buf)
	Check buffer headroom. More...
static uint16_t	net_buf_max_len (struct net_buf *buf)
	Check maximum net_buf::len value. More...
static uint8_t *	net_buf_tail (struct net_buf *buf)
	Get the tail pointer for a buffer. More...
struct net_buf *	net_buf_frag_last (struct net_buf *frags)
	Find the last fragment in the fragment list. More...
void	net_buf_frag_insert (struct net_buf *parent, struct net_buf *frag)
	Insert a new fragment to a chain of bufs. More...
struct net_buf *	net_buf_frag_add (struct net_buf *head, struct net_buf *frag)
	Add a new fragment to the end of a chain of bufs. More...
struct net_buf *	net_buf_frag_del (struct net_buf *parent, struct net_buf *frag)
	Delete existing fragment from a chain of bufs. More...
size_t	net_buf_linearize (void *dst, size_t dst_len, struct net_buf *src, size_t offset, size_t len)
	Copy bytes from net_buf chain starting at offset to linear buffer. More...
size_t	net_buf_append_bytes (struct net_buf *buf, size_t len, const void *value, k_timeout_t timeout, net_buf_allocator_cb allocate_cb, void *user_data)
	Append data to a list of net_buf. More...
static struct net_buf *	net_buf_skip (struct net_buf *buf, size_t len)
	Skip N number of bytes in a net_buf. More...
static size_t	net_buf_frags_len (struct net_buf *buf)
	Calculate amount of bytes stored in fragments. More...

Detailed Description

Network buffer library.

Macro Definition Documentation

NET_BUF_EXTERNAL_DATA

#define NET_BUF_EXTERNAL_DATA   BIT(1)

#include <include/net/buf.h>

Flag indicating that the buffer's associated data pointer, points to externally allocated memory. Therefore once ref goes down to zero, the pointed data will not need to be deallocated. This never needs to be explicitly set or unet by the net_buf API user. Such net_buf is exclusively instantiated via net_buf_alloc_with_data() function. Reference count mechanism however will behave the same way, and ref count going to 0 will free the net_buf but no the data pointer in it.

NET_BUF_FRAGS

#define NET_BUF_FRAGS   BIT(0)

#include <include/net/buf.h>

Flag indicating that the buffer has associated fragments. Only used internally by the buffer handling code while the buffer is inside a FIFO, meaning this never needs to be explicitly set or unset by the net_buf API user. As long as the buffer is outside of a FIFO, i.e. in practice always for the user for this API, the buf->frags pointer should be used instead.

NET_BUF_POOL_DEFINE

#define NET_BUF_POOL_DEFINE	(		_name,
			_count,
			_size,
			_ud_size,
			_destroy
	)

#include <include/net/buf.h>

Value:

        BUILD_ASSERT(_ud_size <= CONFIG_NET_BUF_USER_DATA_SIZE);             \
        NET_BUF_POOL_FIXED_DEFINE(_name, _count, _size, _destroy)

Define a new pool for buffers.

Defines a net_buf_pool struct and the necessary memory storage (array of structs) for the needed amount of buffers. After this,the buffers can be accessed from the pool through net_buf_alloc. The pool is defined as a static variable, so if it needs to be exported outside the current module this needs to happen with the help of a separate pointer rather than an extern declaration.

If provided with a custom destroy callback this callback is responsible for eventually calling net_buf_destroy() to complete the process of returning the buffer to the pool.

Parameters

_name	Name of the pool variable.
_count	Number of buffers in the pool.
_size	Maximum data size for each buffer.
_ud_size	Amount of user data space to reserve.
_destroy	Optional destroy callback when buffer is freed.

NET_BUF_POOL_FIXED_DEFINE

#define NET_BUF_POOL_FIXED_DEFINE	(		_name,
			_count,
			_data_size,
			_destroy
	)

#include <include/net/buf.h>

Value:

        static struct net_buf net_buf_##_name[_count] __noinit;               \
        static uint8_t __noinit net_buf_data_##_name[_count][_data_size];     \
        static const struct net_buf_pool_fixed net_buf_fixed_##_name = {      \
                .data_size = _data_size,                                      \
                .data_pool = (uint8_t *)net_buf_data_##_name,                 \
        };                                                                    \
        static const struct net_buf_data_alloc net_buf_fixed_alloc_##_name = {\
                .cb = &net_buf_fixed_cb,                                      \
                .alloc_data = (void *)&net_buf_fixed_##_name,                 \
        };                                                                    \
        static struct net_buf_pool _name __net_buf_align                      \
                        __in_section(_net_buf_pool, static, _name) =          \
                NET_BUF_POOL_INITIALIZER(_name, &net_buf_fixed_alloc_##_name, \
                                         net_buf_##_name, _count, _destroy)

Define a new pool for buffers based on fixed-size data.

Defines a net_buf_pool struct and the necessary memory storage (array of structs) for the needed amount of buffers. After this, the buffers can be accessed from the pool through net_buf_alloc. The pool is defined as a static variable, so if it needs to be exported outside the current module this needs to happen with the help of a separate pointer rather than an extern declaration.

The data payload of the buffers will be allocated from a byte array of fixed sized chunks. This kind of pool does not support blocking on the data allocation, so the timeout passed to net_buf_alloc will be always treated as K_NO_WAIT when trying to allocate the data. This means that allocation failures, i.e. NULL returns, must always be handled cleanly.

If provided with a custom destroy callback, this callback is responsible for eventually calling net_buf_destroy() to complete the process of returning the buffer to the pool.

Parameters

_name	Name of the pool variable.
_count	Number of buffers in the pool.
_data_size	Maximum data payload per buffer.
_destroy	Optional destroy callback when buffer is freed.

NET_BUF_POOL_HEAP_DEFINE

#define NET_BUF_POOL_HEAP_DEFINE	(		_name,
			_count,
			_destroy
	)

#include <include/net/buf.h>

Value:

        static struct net_buf net_buf_##_name[_count] __noinit;               \
        static struct net_buf_pool _name __net_buf_align                      \
                        __in_section(_net_buf_pool, static, _name) =          \
                NET_BUF_POOL_INITIALIZER(_name, &net_buf_heap_alloc,          \
                                         net_buf_##_name, _count, _destroy)

Define a new pool for buffers using the heap for the data.

Defines a net_buf_pool struct and the necessary memory storage (array of structs) for the needed amount of buffers. After this, the buffers can be accessed from the pool through net_buf_alloc. The pool is defined as a static variable, so if it needs to be exported outside the current module this needs to happen with the help of a separate pointer rather than an extern declaration.

The data payload of the buffers will be allocated from the heap using k_malloc, so CONFIG_HEAP_MEM_POOL_SIZE must be set to a positive value. This kind of pool does not support blocking on the data allocation, so the timeout passed to net_buf_alloc will be always treated as K_NO_WAIT when trying to allocate the data. This means that allocation failures, i.e. NULL returns, must always be handled cleanly.

If provided with a custom destroy callback, this callback is responsible for eventually calling net_buf_destroy() to complete the process of returning the buffer to the pool.

Parameters

_name	Name of the pool variable.
_count	Number of buffers in the pool.
_destroy	Optional destroy callback when buffer is freed.

NET_BUF_POOL_VAR_DEFINE

#define NET_BUF_POOL_VAR_DEFINE	(		_name,
			_count,
			_data_size,
			_destroy
	)

#include <include/net/buf.h>

Value:

        static struct net_buf _net_buf_##_name[_count] __noinit;              \
        K_HEAP_DEFINE(net_buf_mem_pool_##_name, _data_size); \
        static const struct net_buf_data_alloc net_buf_data_alloc_##_name = { \
                .cb = &net_buf_var_cb,                                        \
                .alloc_data = &net_buf_mem_pool_##_name,                      \
        };                                                                    \
        static struct net_buf_pool _name __net_buf_align                      \
                        __in_section(_net_buf_pool, static, _name) =          \
                NET_BUF_POOL_INITIALIZER(_name, &net_buf_data_alloc_##_name,  \
                                         _net_buf_##_name, _count, _destroy)

Define a new pool for buffers with variable size payloads.

Defines a net_buf_pool struct and the necessary memory storage (array of structs) for the needed amount of buffers. After this, the buffers can be accessed from the pool through net_buf_alloc. The pool is defined as a static variable, so if it needs to be exported outside the current module this needs to happen with the help of a separate pointer rather than an extern declaration.

The data payload of the buffers will be based on a memory pool from which variable size payloads may be allocated.

If provided with a custom destroy callback, this callback is responsible for eventually calling net_buf_destroy() to complete the process of returning the buffer to the pool.

Parameters

_name	Name of the pool variable.
_count	Number of buffers in the pool.
_data_size	Total amount of memory available for data payloads.
_destroy	Optional destroy callback when buffer is freed.

NET_BUF_SIMPLE

#define NET_BUF_SIMPLE

(

_size

)

#include <include/net/buf.h>

Value:

        ((struct net_buf_simple *)(&(struct {        \
                struct net_buf_simple buf;           \
                uint8_t data[_size];                 \
        }) {                                         \
                .buf.size = _size,                   \
        }))

Define a net_buf_simple stack variable and get a pointer to it.

This is a helper macro which is used to define a net_buf_simple object on the stack and the get a pointer to it as follows:

struct net_buf_simple *my_buf = NET_BUF_SIMPLE(10);

After creating the object it needs to be initialized by calling net_buf_simple_init().

Parameters

_size

Maximum data storage for the buffer.

Returns

Pointer to stack-allocated net_buf_simple object.

NET_BUF_SIMPLE_DEFINE

#define NET_BUF_SIMPLE_DEFINE	(		_name,
			_size
	)

#include <include/net/buf.h>

Value:

        uint8_t net_buf_data_##_name[_size];       \
        struct net_buf_simple _name = {         \
                .data   = net_buf_data_##_name, \
                .len    = 0,                    \
                .size   = _size,                \
                .__buf  = net_buf_data_##_name, \
        }

Define a net_buf_simple stack variable.

This is a helper macro which is used to define a net_buf_simple object on the stack.

Parameters

_name	Name of the net_buf_simple object.
_size	Maximum data storage for the buffer.

NET_BUF_SIMPLE_DEFINE_STATIC

#define NET_BUF_SIMPLE_DEFINE_STATIC	(		_name,
			_size
	)

#include <include/net/buf.h>

Value:

        static __noinit uint8_t net_buf_data_##_name[_size]; \
        static struct net_buf_simple _name = {            \
                .data   = net_buf_data_##_name,           \
                .len    = 0,                              \
                .size   = _size,                          \
                .__buf  = net_buf_data_##_name,           \
        }

Define a static net_buf_simple variable.

This is a helper macro which is used to define a static net_buf_simple object.

Parameters

_name	Name of the net_buf_simple object.
_size	Maximum data storage for the buffer.

Typedef Documentation

net_buf_allocator_cb

net_buf_allocator_cb

#include <include/net/buf.h>

Network buffer allocator callback.

The allocator callback is called when net_buf_append_bytes needs to allocate a new net_buf.

Parameters

timeout	Affects the action taken should the net buf pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait until the specified timeout.
user_data	The user data given in net_buf_append_bytes call.

Returns

pointer to allocated net_buf or NULL on error.

Function Documentation

net_buf_add()

static void * net_buf_add ( struct net_buf *  buf, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Prepare data to be added at the end of the buffer.

Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
len	Number of bytes to increment the length with.

Returns

The original tail of the buffer.

net_buf_add_be16()

static void net_buf_add_be16 ( struct net_buf *  buf, uint16_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 16-bit value at the end of the buffer.

Adds 16-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	16-bit value to be added.

net_buf_add_be24()

static void net_buf_add_be24 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 24-bit value at the end of the buffer.

Adds 24-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	24-bit value to be added.

net_buf_add_be32()

static void net_buf_add_be32 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 32-bit value at the end of the buffer.

Adds 32-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	32-bit value to be added.

net_buf_add_be48()

static void net_buf_add_be48 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 48-bit value at the end of the buffer.

Adds 48-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	48-bit value to be added.

net_buf_add_be64()

static void net_buf_add_be64 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 64-bit value at the end of the buffer.

Adds 64-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	64-bit value to be added.

net_buf_add_le16()

static void net_buf_add_le16 ( struct net_buf *  buf, uint16_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 16-bit value at the end of the buffer.

Adds 16-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	16-bit value to be added.

net_buf_add_le24()

static void net_buf_add_le24 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 24-bit value at the end of the buffer.

Adds 24-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	24-bit value to be added.

net_buf_add_le32()

static void net_buf_add_le32 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 32-bit value at the end of the buffer.

Adds 32-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	32-bit value to be added.

net_buf_add_le48()

static void net_buf_add_le48 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 48-bit value at the end of the buffer.

Adds 48-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	48-bit value to be added.

net_buf_add_le64()

static void net_buf_add_le64 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Add 64-bit value at the end of the buffer.

Adds 64-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	64-bit value to be added.

net_buf_add_mem()

static void * net_buf_add_mem ( struct net_buf *  buf, const void *  mem, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Copies the given number of bytes to the end of the buffer.

Increments the data length of the buffer to account for more data at the end.

Parameters

buf	Buffer to update.
mem	Location of data to be added.
len	Length of data to be added

Returns

The original tail of the buffer.

net_buf_add_u8()

static uint8_t * net_buf_add_u8 ( struct net_buf *  buf, uint8_t  val  )

inlinestatic

#include <include/net/buf.h>

Add (8-bit) byte at the end of the buffer.

Increments the data length of the buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	byte value to be added.

Returns

Pointer to the value added

net_buf_alloc()

static struct net_buf * net_buf_alloc ( struct net_buf_pool *  pool, k_timeout_t  timeout  )

inlinestatic

#include <include/net/buf.h>

Parameters

pool	Which pool to allocate the buffer from.
timeout	Affects the action taken should the pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait until the specified timeout. Note that some types of data allocators do not support blocking (such as the HEAP type). In this case it's still possible for net_buf_alloc() to fail (return NULL) even if it was given K_FOREVER.

Returns

New buffer or NULL if out of buffers.

net_buf_alloc_fixed()

struct net_buf * net_buf_alloc_fixed	(	struct net_buf_pool *	pool,
		k_timeout_t	timeout
	)

#include <include/net/buf.h>

Allocate a new fixed buffer from a pool.

Parameters

pool	Which pool to allocate the buffer from.
timeout	Affects the action taken should the pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait until the specified timeout. Note that some types of data allocators do not support blocking (such as the HEAP type). In this case it's still possible for net_buf_alloc() to fail (return NULL) even if it was given K_FOREVER.

Returns

New buffer or NULL if out of buffers.

net_buf_alloc_len()

struct net_buf * net_buf_alloc_len	(	struct net_buf_pool *	pool,
		size_t	size,
		k_timeout_t	timeout
	)

#include <include/net/buf.h>

Allocate a new variable length buffer from a pool.

Parameters

pool	Which pool to allocate the buffer from.
size	Amount of data the buffer must be able to fit.
timeout	Affects the action taken should the pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait until the specified timeout. Note that some types of data allocators do not support blocking (such as the HEAP type). In this case it's still possible for net_buf_alloc() to fail (return NULL) even if it was given K_FOREVER.

Returns

New buffer or NULL if out of buffers.

net_buf_alloc_with_data()

struct net_buf * net_buf_alloc_with_data	(	struct net_buf_pool *	pool,
		void *	data,
		size_t	size,
		k_timeout_t	timeout
	)

#include <include/net/buf.h>

Allocate a new buffer from a pool but with external data pointer.

Allocate a new buffer from a pool, where the data pointer comes from the user and not from the pool.

Parameters

pool	Which pool to allocate the buffer from.
data	External data pointer
size	Amount of data the pointed data buffer if able to fit.
timeout	Affects the action taken should the pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait until the specified timeout. Note that some types of data allocators do not support blocking (such as the HEAP type). In this case it's still possible for net_buf_alloc() to fail (return NULL) even if it was given K_FOREVER.

Returns

New buffer or NULL if out of buffers.

net_buf_append_bytes()

size_t net_buf_append_bytes	(	struct net_buf *	buf,
		size_t	len,
		const void *	value,
		k_timeout_t	timeout,
		net_buf_allocator_cb	allocate_cb,
		void *	user_data
	)

#include <include/net/buf.h>

Append data to a list of net_buf.

Append data to a net_buf. If there is not enough space in the net_buf then more net_buf will be added, unless there are no free net_buf and timeout occurs. If not allocator is provided it attempts to allocate from the same pool as the original buffer.

Parameters

buf	Network buffer.
len	Total length of input data
value	Data to be added
timeout	Timeout is passed to the net_buf allocator callback.
allocate_cb	When a new net_buf is required, use this callback.
user_data	A user data pointer to be supplied to the allocate_cb. This pointer is can be anything from a mem_pool or a net_pkt, the logic is left up to the allocate_cb function.

Returns

Length of data actually added. This may be less than input length if other timeout than K_FOREVER was used, and there were no free fragments in a pool to accommodate all data.

net_buf_clone()

struct net_buf * net_buf_clone	(	struct net_buf *	buf,
		k_timeout_t	timeout
	)

#include <include/net/buf.h>

Clone buffer.

Duplicate given buffer including any data and headers currently stored.

Parameters

buf	A valid pointer on a buffer
timeout	Affects the action taken should the pool be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait until the specified timeout.

Returns

Cloned buffer or NULL if out of buffers.

net_buf_destroy()

static void net_buf_destroy ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Destroy buffer from custom destroy callback.

This helper is only intended to be used from custom destroy callbacks. If no custom destroy callback is given to NET_BUF_POOL_*_DEFINE() then there is no need to use this API.

Parameters

buf	Buffer to destroy.

net_buf_frag_add()

struct net_buf * net_buf_frag_add	(	struct net_buf *	head,
		struct net_buf *	frag
	)

#include <include/net/buf.h>

Add a new fragment to the end of a chain of bufs.

Append a new fragment into the buffer fragments list.

Note: This function takes ownership of the fragment reference so the caller is not required to unref.

Parameters

head	Head of the fragment chain.
frag	Fragment to add.

Returns

New head of the fragment chain. Either head (if head was non-NULL) or frag (if head was NULL).

net_buf_frag_del()

struct net_buf * net_buf_frag_del	(	struct net_buf *	parent,
		struct net_buf *	frag
	)

#include <include/net/buf.h>

Delete existing fragment from a chain of bufs.

Parameters

parent	Parent buffer/fragment, or NULL if there is no parent.
frag	Fragment to delete.

Returns

Pointer to the buffer following the fragment, or NULL if it had no further fragments.

net_buf_frag_insert()

void net_buf_frag_insert	(	struct net_buf *	parent,
		struct net_buf *	frag
	)

#include <include/net/buf.h>

Insert a new fragment to a chain of bufs.

Insert a new fragment into the buffer fragments list after the parent.

Note: This function takes ownership of the fragment reference so the caller is not required to unref.

Parameters

parent	Parent buffer/fragment.
frag	Fragment to insert.

net_buf_frag_last()

struct net_buf * net_buf_frag_last

(

struct net_buf *

frags

)

#include <include/net/buf.h>

Find the last fragment in the fragment list.

Returns

Pointer to last fragment in the list.

net_buf_frags_len()

static size_t net_buf_frags_len ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Calculate amount of bytes stored in fragments.

Calculates the total amount of data stored in the given buffer and the fragments linked to it.

Parameters

buf	Buffer to start off with.

Returns

Number of bytes in the buffer and its fragments.

net_buf_get()

struct net_buf * net_buf_get	(	struct k_fifo *	fifo,
		k_timeout_t	timeout
	)

#include <include/net/buf.h>

Get a buffer from a FIFO.

This function is NOT thread-safe if the buffers in the FIFO contain fragments.

Parameters

fifo	Which FIFO to take the buffer from.
timeout	Affects the action taken should the FIFO be empty. If K_NO_WAIT, then return immediately. If K_FOREVER, then wait as long as necessary. Otherwise, wait until the specified timeout.

Returns

New buffer or NULL if the FIFO is empty.

net_buf_headroom()

static size_t net_buf_headroom ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Check buffer headroom.

Check how much free space there is in the beginning of the buffer.

buf A valid pointer on a buffer

Returns

Number of bytes available in the beginning of the buffer.

net_buf_id()

int net_buf_id

(

struct net_buf *

buf

)

#include <include/net/buf.h>

Get a zero-based index for a buffer.

This function will translate a buffer into a zero-based index, based on its placement in its buffer pool. This can be useful if you want to associate an external array of meta-data contexts with the buffers of a pool.

Parameters

buf	Network buffer.

Returns

Zero-based index for the buffer.

net_buf_linearize()

size_t net_buf_linearize	(	void *	dst,
		size_t	dst_len,
		struct net_buf *	src,
		size_t	offset,
		size_t	len
	)

#include <include/net/buf.h>

Copy bytes from net_buf chain starting at offset to linear buffer.

Copy (extract) len bytes from src net_buf chain, starting from offset in it, to a linear buffer dst. Return number of bytes actually copied, which may be less than requested, if net_buf chain doesn't have enough data, or destination buffer is too small.

Parameters

dst	Destination buffer
dst_len	Destination buffer length
src	Source net_buf chain
offset	Starting offset to copy from
len	Number of bytes to copy

Returns

number of bytes actually copied

net_buf_max_len()

static uint16_t net_buf_max_len ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Check maximum net_buf::len value.

This value is depending on the number of bytes being reserved as headroom.

Parameters

buf	A valid pointer on a buffer

Returns

Number of bytes usable behind the net_buf::data pointer.

net_buf_pool_get()

struct net_buf_pool * net_buf_pool_get

(

int

id

)

#include <include/net/buf.h>

Looks up a pool based on its ID.

Parameters

id	Pool ID (e.g. from buf->pool_id).

Returns

Pointer to pool.

net_buf_pull()

static void * net_buf_pull ( struct net_buf *  buf, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Remove data from the beginning of the buffer.

Removes data from the beginning of the buffer by modifying the data pointer and buffer length.

Parameters

buf	Buffer to update.
len	Number of bytes to remove.

Returns

New beginning of the buffer data.

net_buf_pull_be16()

static uint16_t net_buf_pull_be16 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 16 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 16-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from big endian to host endian.

net_buf_pull_be24()

static uint32_t net_buf_pull_be24 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 24 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 24-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from big endian to host endian.

net_buf_pull_be32()

static uint32_t net_buf_pull_be32 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 32 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 32-bit big endian data.

Parameters

buf	A valid pointer on a buffer

Returns

32-bit value converted from big endian to host endian.

net_buf_pull_be48()

static uint64_t net_buf_pull_be48 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 48 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 48-bit big endian data.

Parameters

buf	A valid pointer on a buffer

Returns

48-bit value converted from big endian to host endian.

net_buf_pull_be64()

static uint64_t net_buf_pull_be64 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 64 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 64-bit big endian data.

Parameters

buf	A valid pointer on a buffer

Returns

64-bit value converted from big endian to host endian.

net_buf_pull_le16()

static uint16_t net_buf_pull_le16 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 16 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 16-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from little endian to host endian.

net_buf_pull_le24()

static uint32_t net_buf_pull_le24 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 24 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 24-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from little endian to host endian.

net_buf_pull_le32()

static uint32_t net_buf_pull_le32 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 32 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 32-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

32-bit value converted from little endian to host endian.

net_buf_pull_le48()

static uint64_t net_buf_pull_le48 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 48 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 48-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

48-bit value converted from little endian to host endian.

net_buf_pull_le64()

static uint64_t net_buf_pull_le64 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 64 bits from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 64-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

64-bit value converted from little endian to host endian.

net_buf_pull_mem()

static void * net_buf_pull_mem ( struct net_buf *  buf, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Remove data from the beginning of the buffer.

Removes data from the beginning of the buffer by modifying the data pointer and buffer length.

Parameters

buf	Buffer to update.
len	Number of bytes to remove.

Returns

Pointer to the old beginning of the buffer data.

net_buf_pull_u8()

static uint8_t net_buf_pull_u8 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove a 8-bit value from the beginning of the buffer.

Same idea as with net_buf_pull(), but a helper for operating on 8-bit values.

Parameters

buf	A valid pointer on a buffer.

Returns

The 8-bit removed value

net_buf_push()

static void * net_buf_push ( struct net_buf *  buf, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Prepare data to be added at the start of the buffer.

Modifies the data pointer and buffer length to account for more data in the beginning of the buffer.

Parameters

buf	Buffer to update.
len	Number of bytes to add to the beginning.

Returns

The new beginning of the buffer data.

net_buf_push_be16()

static void net_buf_push_be16 ( struct net_buf *  buf, uint16_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 16-bit value to the beginning of the buffer.

Adds 16-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	16-bit value to be pushed to the buffer.

net_buf_push_be24()

static void net_buf_push_be24 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 24-bit value to the beginning of the buffer.

Adds 24-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	24-bit value to be pushed to the buffer.

net_buf_push_be32()

static void net_buf_push_be32 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 32-bit value to the beginning of the buffer.

Adds 32-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	32-bit value to be pushed to the buffer.

net_buf_push_be48()

static void net_buf_push_be48 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 48-bit value to the beginning of the buffer.

Adds 48-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	48-bit value to be pushed to the buffer.

net_buf_push_be64()

static void net_buf_push_be64 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 64-bit value to the beginning of the buffer.

Adds 64-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	64-bit value to be pushed to the buffer.

net_buf_push_le16()

static void net_buf_push_le16 ( struct net_buf *  buf, uint16_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 16-bit value to the beginning of the buffer.

Adds 16-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	16-bit value to be pushed to the buffer.

net_buf_push_le24()

static void net_buf_push_le24 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 24-bit value to the beginning of the buffer.

Adds 24-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	24-bit value to be pushed to the buffer.

net_buf_push_le32()

static void net_buf_push_le32 ( struct net_buf *  buf, uint32_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 32-bit value to the beginning of the buffer.

Adds 32-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	32-bit value to be pushed to the buffer.

net_buf_push_le48()

static void net_buf_push_le48 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 48-bit value to the beginning of the buffer.

Adds 48-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	48-bit value to be pushed to the buffer.

net_buf_push_le64()

static void net_buf_push_le64 ( struct net_buf *  buf, uint64_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 64-bit value to the beginning of the buffer.

Adds 64-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	64-bit value to be pushed to the buffer.

net_buf_push_mem()

static void * net_buf_push_mem ( struct net_buf *  buf, const void *  mem, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Copies the given number of bytes to the start of the buffer.

Modifies the data pointer and buffer length to account for more data in the beginning of the buffer.

Parameters

buf	Buffer to update.
mem	Location of data to be added.
len	Length of data to be added.

Returns

The new beginning of the buffer data.

net_buf_push_u8()

static void net_buf_push_u8 ( struct net_buf *  buf, uint8_t  val  )

inlinestatic

#include <include/net/buf.h>

Push 8-bit value to the beginning of the buffer.

Adds 8-bit value the beginning of the buffer.

Parameters

buf	Buffer to update.
val	8-bit value to be pushed to the buffer.

net_buf_put()

void net_buf_put	(	struct k_fifo *	fifo,
		struct net_buf *	buf
	)

#include <include/net/buf.h>

Put a buffer to the end of a FIFO.

If the buffer contains follow-up fragments this function will take care of inserting them as well into the FIFO.

Parameters

fifo	Which FIFO to put the buffer to.
buf	Buffer.

net_buf_ref()

struct net_buf * net_buf_ref

(

struct net_buf *

buf

)

#include <include/net/buf.h>

Increment the reference count of a buffer.

Parameters

buf	A valid pointer on a buffer

Returns

the buffer newly referenced

net_buf_remove_be16()

static uint16_t net_buf_remove_be16 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 16 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 16-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from big endian to host endian.

net_buf_remove_be24()

static uint32_t net_buf_remove_be24 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 24 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 24-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from big endian to host endian.

net_buf_remove_be32()

static uint32_t net_buf_remove_be32 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 32 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 32-bit big endian data.

Parameters

buf	A valid pointer on a buffer

Returns

32-bit value converted from big endian to host endian.

net_buf_remove_be48()

static uint64_t net_buf_remove_be48 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 48 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 48-bit big endian data.

Parameters

buf	A valid pointer on a buffer

Returns

48-bit value converted from big endian to host endian.

net_buf_remove_be64()

static uint64_t net_buf_remove_be64 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 64 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 64-bit big endian data.

Parameters

buf	A valid pointer on a buffer

Returns

64-bit value converted from big endian to host endian.

net_buf_remove_le16()

static uint16_t net_buf_remove_le16 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 16 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 16-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from little endian to host endian.

net_buf_remove_le24()

static uint32_t net_buf_remove_le24 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 24 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 24-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from little endian to host endian.

net_buf_remove_le32()

static uint32_t net_buf_remove_le32 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 32 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 32-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

32-bit value converted from little endian to host endian.

net_buf_remove_le48()

static uint64_t net_buf_remove_le48 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 48 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 48-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

48-bit value converted from little endian to host endian.

net_buf_remove_le64()

static uint64_t net_buf_remove_le64 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove and convert 64 bits from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 64-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

64-bit value converted from little endian to host endian.

net_buf_remove_mem()

static void * net_buf_remove_mem ( struct net_buf *  buf, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Remove data from the end of the buffer.

Removes data from the end of the buffer by modifying the buffer length.

Parameters

buf	Buffer to update.
len	Number of bytes to remove.

Returns

New end of the buffer data.

net_buf_remove_u8()

static uint8_t net_buf_remove_u8 ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Remove a 8-bit value from the end of the buffer.

Same idea as with net_buf_remove_mem(), but a helper for operating on 8-bit values.

Parameters

buf	A valid pointer on a buffer.

Returns

The 8-bit removed value

net_buf_reserve()

static void net_buf_reserve ( struct net_buf *  buf, size_t  reserve  )

inlinestatic

#include <include/net/buf.h>

Initialize buffer with the given headroom.

The buffer is not expected to contain any data when this API is called.

Parameters

buf	Buffer to initialize.
reserve	How much headroom to reserve.

net_buf_reset()

void net_buf_reset

(

struct net_buf *

buf

)

#include <include/net/buf.h>

Reset buffer.

Reset buffer data and flags so it can be reused for other purposes.

Parameters

buf	Buffer to reset.

net_buf_simple_add()

void * net_buf_simple_add	(	struct net_buf_simple *	buf,
		size_t	len
	)

#include <include/net/buf.h>

Prepare data to be added at the end of the buffer.

Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
len	Number of bytes to increment the length with.

Returns

The original tail of the buffer.

net_buf_simple_add_be16()

void net_buf_simple_add_be16	(	struct net_buf_simple *	buf,
		uint16_t	val
	)

#include <include/net/buf.h>

Add 16-bit value at the end of the buffer.

Adds 16-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	16-bit value to be added.

net_buf_simple_add_be24()

void net_buf_simple_add_be24	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Add 24-bit value at the end of the buffer.

Adds 24-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	24-bit value to be added.

net_buf_simple_add_be32()

void net_buf_simple_add_be32	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Add 32-bit value at the end of the buffer.

Adds 32-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	32-bit value to be added.

net_buf_simple_add_be48()

void net_buf_simple_add_be48	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Add 48-bit value at the end of the buffer.

Adds 48-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	48-bit value to be added.

net_buf_simple_add_be64()

void net_buf_simple_add_be64	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Add 64-bit value at the end of the buffer.

Adds 64-bit value in big endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	64-bit value to be added.

net_buf_simple_add_le16()

void net_buf_simple_add_le16	(	struct net_buf_simple *	buf,
		uint16_t	val
	)

#include <include/net/buf.h>

Add 16-bit value at the end of the buffer.

Adds 16-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	16-bit value to be added.

net_buf_simple_add_le24()

void net_buf_simple_add_le24	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Add 24-bit value at the end of the buffer.

Adds 24-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	24-bit value to be added.

net_buf_simple_add_le32()

void net_buf_simple_add_le32	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Add 32-bit value at the end of the buffer.

Adds 32-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	32-bit value to be added.

net_buf_simple_add_le48()

void net_buf_simple_add_le48	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Add 48-bit value at the end of the buffer.

Adds 48-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	48-bit value to be added.

net_buf_simple_add_le64()

void net_buf_simple_add_le64	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Add 64-bit value at the end of the buffer.

Adds 64-bit value in little endian format at the end of buffer. Increments the data length of a buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	64-bit value to be added.

net_buf_simple_add_mem()

void * net_buf_simple_add_mem	(	struct net_buf_simple *	buf,
		const void *	mem,
		size_t	len
	)

#include <include/net/buf.h>

Copy given number of bytes from memory to the end of the buffer.

Increments the data length of the buffer to account for more data at the end.

Parameters

buf	Buffer to update.
mem	Location of data to be added.
len	Length of data to be added

Returns

The original tail of the buffer.

net_buf_simple_add_u8()

uint8_t * net_buf_simple_add_u8	(	struct net_buf_simple *	buf,
		uint8_t	val
	)

#include <include/net/buf.h>

Add (8-bit) byte at the end of the buffer.

Increments the data length of the buffer to account for more data at the end.

Parameters

buf	Buffer to update.
val	byte value to be added.

Returns

Pointer to the value added

net_buf_simple_clone()

void net_buf_simple_clone	(	const struct net_buf_simple *	original,
		struct net_buf_simple *	clone
	)

#include <include/net/buf.h>

Clone buffer state, using the same data buffer.

Initializes a buffer to point to the same data as an existing buffer. Allows operations on the same data without altering the length and offset of the original.

Parameters

original	Buffer to clone.
clone	The new clone.

net_buf_simple_headroom()

size_t net_buf_simple_headroom

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Check buffer headroom.

Check how much free space there is in the beginning of the buffer.

buf A valid pointer on a buffer

Returns

Number of bytes available in the beginning of the buffer.

net_buf_simple_init()

static void net_buf_simple_init ( struct net_buf_simple *  buf, size_t  reserve_head  )

inlinestatic

#include <include/net/buf.h>

Initialize a net_buf_simple object.

This needs to be called after creating a net_buf_simple object using the NET_BUF_SIMPLE macro.

Parameters

buf	Buffer to initialize.
reserve_head	Headroom to reserve.

net_buf_simple_init_with_data()

void net_buf_simple_init_with_data	(	struct net_buf_simple *	buf,
		void *	data,
		size_t	size
	)

#include <include/net/buf.h>

Initialize a net_buf_simple object with data.

Initialized buffer object with external data.

Parameters

buf	Buffer to initialize.
data	External data pointer
size	Amount of data the pointed data buffer if able to fit.

net_buf_simple_max_len()

uint16_t net_buf_simple_max_len

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Check maximum net_buf_simple::len value.

This value is depending on the number of bytes being reserved as headroom.

Parameters

buf	A valid pointer on a buffer

Returns

Number of bytes usable behind the net_buf_simple::data pointer.

net_buf_simple_pull()

void * net_buf_simple_pull	(	struct net_buf_simple *	buf,
		size_t	len
	)

#include <include/net/buf.h>

Remove data from the beginning of the buffer.

Removes data from the beginning of the buffer by modifying the data pointer and buffer length.

Parameters

buf	Buffer to update.
len	Number of bytes to remove.

Returns

New beginning of the buffer data.

net_buf_simple_pull_be16()

uint16_t net_buf_simple_pull_be16

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 16 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 16-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from big endian to host endian.

net_buf_simple_pull_be24()

uint32_t net_buf_simple_pull_be24

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 24 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 24-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from big endian to host endian.

net_buf_simple_pull_be32()

uint32_t net_buf_simple_pull_be32

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 32 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 32-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

32-bit value converted from big endian to host endian.

net_buf_simple_pull_be48()

uint64_t net_buf_simple_pull_be48

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 48 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 48-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

48-bit value converted from big endian to host endian.

net_buf_simple_pull_be64()

uint64_t net_buf_simple_pull_be64

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 64 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 64-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

64-bit value converted from big endian to host endian.

net_buf_simple_pull_le16()

uint16_t net_buf_simple_pull_le16

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 16 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 16-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from little endian to host endian.

net_buf_simple_pull_le24()

uint32_t net_buf_simple_pull_le24

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 24 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 24-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from little endian to host endian.

net_buf_simple_pull_le32()

uint32_t net_buf_simple_pull_le32

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 32 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 32-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

32-bit value converted from little endian to host endian.

net_buf_simple_pull_le48()

uint64_t net_buf_simple_pull_le48

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 48 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 48-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

48-bit value converted from little endian to host endian.

net_buf_simple_pull_le64()

uint64_t net_buf_simple_pull_le64

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 64 bits from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 64-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

64-bit value converted from little endian to host endian.

net_buf_simple_pull_mem()

void * net_buf_simple_pull_mem	(	struct net_buf_simple *	buf,
		size_t	len
	)

#include <include/net/buf.h>

Remove data from the beginning of the buffer.

Removes data from the beginning of the buffer by modifying the data pointer and buffer length.

Parameters

buf	Buffer to update.
len	Number of bytes to remove.

Returns

Pointer to the old location of the buffer data.

net_buf_simple_pull_u8()

uint8_t net_buf_simple_pull_u8

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove a 8-bit value from the beginning of the buffer.

Same idea as with net_buf_simple_pull(), but a helper for operating on 8-bit values.

Parameters

buf	A valid pointer on a buffer.

Returns

The 8-bit removed value

net_buf_simple_push()

void * net_buf_simple_push	(	struct net_buf_simple *	buf,
		size_t	len
	)

#include <include/net/buf.h>

Prepare data to be added to the start of the buffer.

Modifies the data pointer and buffer length to account for more data in the beginning of the buffer.

Parameters

buf	Buffer to update.
len	Number of bytes to add to the beginning.

Returns

The new beginning of the buffer data.

net_buf_simple_push_be16()

void net_buf_simple_push_be16	(	struct net_buf_simple *	buf,
		uint16_t	val
	)

#include <include/net/buf.h>

Push 16-bit value to the beginning of the buffer.

Adds 16-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	16-bit value to be pushed to the buffer.

net_buf_simple_push_be24()

void net_buf_simple_push_be24	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Push 24-bit value to the beginning of the buffer.

Adds 24-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	24-bit value to be pushed to the buffer.

net_buf_simple_push_be32()

void net_buf_simple_push_be32	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Push 32-bit value to the beginning of the buffer.

Adds 32-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	32-bit value to be pushed to the buffer.

net_buf_simple_push_be48()

void net_buf_simple_push_be48	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Push 48-bit value to the beginning of the buffer.

Adds 48-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	48-bit value to be pushed to the buffer.

net_buf_simple_push_be64()

void net_buf_simple_push_be64	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Push 64-bit value to the beginning of the buffer.

Adds 64-bit value in big endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	64-bit value to be pushed to the buffer.

net_buf_simple_push_le16()

void net_buf_simple_push_le16	(	struct net_buf_simple *	buf,
		uint16_t	val
	)

#include <include/net/buf.h>

Push 16-bit value to the beginning of the buffer.

Adds 16-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	16-bit value to be pushed to the buffer.

net_buf_simple_push_le24()

void net_buf_simple_push_le24	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Push 24-bit value to the beginning of the buffer.

Adds 24-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	24-bit value to be pushed to the buffer.

net_buf_simple_push_le32()

void net_buf_simple_push_le32	(	struct net_buf_simple *	buf,
		uint32_t	val
	)

#include <include/net/buf.h>

Push 32-bit value to the beginning of the buffer.

Adds 32-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	32-bit value to be pushed to the buffer.

net_buf_simple_push_le48()

void net_buf_simple_push_le48	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Push 48-bit value to the beginning of the buffer.

Adds 48-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	48-bit value to be pushed to the buffer.

net_buf_simple_push_le64()

void net_buf_simple_push_le64	(	struct net_buf_simple *	buf,
		uint64_t	val
	)

#include <include/net/buf.h>

Push 64-bit value to the beginning of the buffer.

Adds 64-bit value in little endian format to the beginning of the buffer.

Parameters

buf	Buffer to update.
val	64-bit value to be pushed to the buffer.

net_buf_simple_push_mem()

void * net_buf_simple_push_mem	(	struct net_buf_simple *	buf,
		const void *	mem,
		size_t	len
	)

#include <include/net/buf.h>

Copy given number of bytes from memory to the start of the buffer.

Modifies the data pointer and buffer length to account for more data in the beginning of the buffer.

Parameters

buf	Buffer to update.
mem	Location of data to be added.
len	Length of data to be added.

Returns

The new beginning of the buffer data.

net_buf_simple_push_u8()

void net_buf_simple_push_u8	(	struct net_buf_simple *	buf,
		uint8_t	val
	)

#include <include/net/buf.h>

Push 8-bit value to the beginning of the buffer.

Adds 8-bit value the beginning of the buffer.

Parameters

buf	Buffer to update.
val	8-bit value to be pushed to the buffer.

net_buf_simple_remove_be16()

uint16_t net_buf_simple_remove_be16

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 16 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 16-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from big endian to host endian.

net_buf_simple_remove_be24()

uint32_t net_buf_simple_remove_be24

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 24 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 24-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from big endian to host endian.

net_buf_simple_remove_be32()

uint32_t net_buf_simple_remove_be32

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 32 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 32-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

32-bit value converted from big endian to host endian.

net_buf_simple_remove_be48()

uint64_t net_buf_simple_remove_be48

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 48 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 48-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

48-bit value converted from big endian to host endian.

net_buf_simple_remove_be64()

uint64_t net_buf_simple_remove_be64

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 64 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 64-bit big endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

64-bit value converted from big endian to host endian.

net_buf_simple_remove_le16()

uint16_t net_buf_simple_remove_le16

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 16 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 16-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

16-bit value converted from little endian to host endian.

net_buf_simple_remove_le24()

uint32_t net_buf_simple_remove_le24

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 24 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 24-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

24-bit value converted from little endian to host endian.

net_buf_simple_remove_le32()

uint32_t net_buf_simple_remove_le32

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 32 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 32-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

32-bit value converted from little endian to host endian.

net_buf_simple_remove_le48()

uint64_t net_buf_simple_remove_le48

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 48 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 48-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

48-bit value converted from little endian to host endian.

net_buf_simple_remove_le64()

uint64_t net_buf_simple_remove_le64

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove and convert 64 bits from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 64-bit little endian data.

Parameters

buf	A valid pointer on a buffer.

Returns

64-bit value converted from little endian to host endian.

net_buf_simple_remove_mem()

void * net_buf_simple_remove_mem	(	struct net_buf_simple *	buf,
		size_t	len
	)

#include <include/net/buf.h>

Remove data from the end of the buffer.

Removes data from the end of the buffer by modifying the buffer length.

Parameters

buf	Buffer to update.
len	Number of bytes to remove.

Returns

New end of the buffer data.

net_buf_simple_remove_u8()

uint8_t net_buf_simple_remove_u8

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Remove a 8-bit value from the end of the buffer.

Same idea as with net_buf_simple_remove_mem(), but a helper for operating on 8-bit values.

Parameters

buf	A valid pointer on a buffer.

Returns

The 8-bit removed value

net_buf_simple_reserve()

void net_buf_simple_reserve	(	struct net_buf_simple *	buf,
		size_t	reserve
	)

#include <include/net/buf.h>

Initialize buffer with the given headroom.

The buffer is not expected to contain any data when this API is called.

Parameters

buf	Buffer to initialize.
reserve	How much headroom to reserve.

net_buf_simple_reset()

static void net_buf_simple_reset ( struct net_buf_simple *  buf )

inlinestatic

#include <include/net/buf.h>

Reset buffer.

Reset buffer data so it can be reused for other purposes.

Parameters

buf	Buffer to reset.

net_buf_simple_restore()

static void net_buf_simple_restore ( struct net_buf_simple *  buf, struct net_buf_simple_state *  state  )

inlinestatic

#include <include/net/buf.h>

Restore the parsing state of a buffer.

Restores the parsing state of a buffer from a state previously stored by net_buf_simple_save().

Parameters

buf	Buffer to which the state should be restored.
state	Stored state.

net_buf_simple_save()

static void net_buf_simple_save ( struct net_buf_simple *  buf, struct net_buf_simple_state *  state  )

inlinestatic

#include <include/net/buf.h>

Save the parsing state of a buffer.

Saves the parsing state of a buffer so it can be restored later.

Parameters

buf	Buffer from which the state should be saved.
state	Storage for the state.

net_buf_simple_tail()

static uint8_t * net_buf_simple_tail ( struct net_buf_simple *  buf )

inlinestatic

#include <include/net/buf.h>

Get the tail pointer for a buffer.

Get a pointer to the end of the data in a buffer.

Parameters

buf

Buffer.

Returns

Tail pointer for the buffer.

net_buf_simple_tailroom()

size_t net_buf_simple_tailroom

(

struct net_buf_simple *

buf

)

#include <include/net/buf.h>

Check buffer tailroom.

Check how much free space there is at the end of the buffer.

Parameters

buf	A valid pointer on a buffer

Returns

Number of bytes available at the end of the buffer.

net_buf_skip()

static struct net_buf * net_buf_skip ( struct net_buf *  buf, size_t  len  )

inlinestatic

#include <include/net/buf.h>

Skip N number of bytes in a net_buf.

Skip N number of bytes starting from fragment's offset. If the total length of data is placed in multiple fragments, this function will skip from all fragments until it reaches N number of bytes. Any fully skipped buffers are removed from the net_buf list.

Parameters

buf	Network buffer.
len	Total length of data to be skipped.

Returns

Pointer to the fragment or NULL and pos is 0 after successful skip, NULL and pos is 0xffff otherwise.

net_buf_slist_get()

struct net_buf * net_buf_slist_get

(

sys_slist_t *

list

)

#include <include/net/buf.h>

Get a buffer from a list.

If the buffer had any fragments, these will automatically be recovered from the list as well and be placed to the buffer's fragment list. This function is NOT thread-safe when recovering fragments.

Parameters

list	Which list to take the buffer from.

Returns

New buffer or NULL if the FIFO is empty.

net_buf_slist_put()

void net_buf_slist_put	(	sys_slist_t *	list,
		struct net_buf *	buf
	)

#include <include/net/buf.h>

Put a buffer into a list.

If the buffer contains follow-up fragments this function will take care of inserting them as well into the list.

Parameters

list	Which list to append the buffer to.
buf	Buffer.

net_buf_tail()

static uint8_t * net_buf_tail ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Get the tail pointer for a buffer.

Get a pointer to the end of the data in a buffer.

Parameters

buf

Buffer.

Returns

Tail pointer for the buffer.

net_buf_tailroom()

static size_t net_buf_tailroom ( struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Check buffer tailroom.

Check how much free space there is at the end of the buffer.

Parameters

buf	A valid pointer on a buffer

Returns

Number of bytes available at the end of the buffer.

net_buf_unref()

void net_buf_unref

(

struct net_buf *

buf

)

#include <include/net/buf.h>

Decrements the reference count of a buffer.

The buffer is put back into the pool if the reference count reaches zero.

Parameters

buf	A valid pointer on a buffer

net_buf_user_data()

static void * net_buf_user_data ( const struct net_buf *  buf )

inlinestatic

#include <include/net/buf.h>

Get a pointer to the user data of a buffer.

Parameters

buf	A valid pointer on a buffer

Returns

Pointer to the user data of the buffer.