buffer.h File Reference

vlib buffer structure definition and a few select access methods. More...

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Data Structures
struct	vlib_buffer_t
struct	vlib_buffer_free_list_t
struct	vlib_buffer_callbacks_t
struct	vlib_buffer_main_t
struct	vlib_serialize_buffer_main_t

Macros
#define	VLIB_BUFFER_DATA_SIZE   (2048)
#define	VLIB_BUFFER_PRE_DATA_SIZE   __PRE_DATA_SIZE
#define	VLIB_BUFFER_FREE_LIST_INDEX_MASK   ((1 << 5) - 1)
#define	VLIB_BUFFER_IS_TRACED   (1 << 5)
#define	VLIB_BUFFER_LOG2_NEXT_PRESENT   (6)
#define	VLIB_BUFFER_NEXT_PRESENT   (1 << VLIB_BUFFER_LOG2_NEXT_PRESENT)
#define	VLIB_BUFFER_IS_RECYCLED   (1 << 7)
#define	VLIB_BUFFER_TOTAL_LENGTH_VALID   (1 << 8)
#define	VLIB_BUFFER_REPL_FAIL   (1 << 9)
#define	VLIB_BUFFER_RECYCLE   (1 << 10)
#define	VLIB_BUFFER_FLOW_REPORT   (1 << 11)
#define	VLIB_BUFFER_EXT_HDR_VALID   (1 << 12)
#define	LOG2_VLIB_BUFFER_FLAG_USER(n)   (32 - (n))
#define	VLIB_BUFFER_FLAG_USER(n)   (1 << LOG2_VLIB_BUFFER_FLAG_USER(n))
#define	VLIB_BUFFER_HDR_SIZE   (sizeof(vlib_buffer_t) - VLIB_BUFFER_PRE_DATA_SIZE)
#define	vlib_prefetch_buffer_header(b, type)   CLIB_PREFETCH (b, 64, type)
	Prefetch buffer metadata. More...
#define	VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX   (0)
#define	VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES   VLIB_BUFFER_DATA_SIZE
#define	VLIB_BUFFER_TRACE_TRAJECTORY   0
	Compile time buffer trajectory tracing option Turn this on if you run into "bad monkey" contexts, and you want to know exactly which nodes they've visited... More...
#define	VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b)
#define	VLIB_BUFFER_REGISTER_CALLBACKS(x, ...)

Typedefs
typedef struct vlib_buffer_free_list_t	vlib_buffer_free_list_t

Functions
static vlib_buffer_t *	vlib_buffer_next_contiguous (vlib_buffer_t *b, u32 buffer_bytes)
static void	vlib_buffer_struct_is_sane (vlib_buffer_t *b)
static void *	vlib_buffer_get_current (vlib_buffer_t *b)
	Get pointer to current data to process. More...
static void	vlib_buffer_advance (vlib_buffer_t *b, word l)
	Advance current data pointer by the supplied (signed!) amount. More...
static u8	vlib_buffer_has_space (vlib_buffer_t *b, word l)
	Check if there is enough space in buffer to advance. More...
static void	vlib_buffer_reset (vlib_buffer_t *b)
	Reset current header & length to state they were in when packet was received. More...
static void *	vlib_get_buffer_opaque (vlib_buffer_t *b)
	Get pointer to buffer's opaque data array. More...
static void *	vlib_get_buffer_opaque2 (vlib_buffer_t *b)
	Get pointer to buffer's opaque2 data array. More...
static u8 *	vlib_buffer_get_tail (vlib_buffer_t *b)
	Get pointer to the end of buffer's data. More...
static void *	vlib_buffer_put_uninit (vlib_buffer_t *b, u8 size)
	Append uninitialized data to buffer. More...
static void *	vlib_buffer_push_uninit (vlib_buffer_t *b, u8 size)
	Prepend uninitialized data to buffer. More...
static void *	vlib_buffer_make_headroom (vlib_buffer_t *b, u8 size)
	Make head room, typically for packet headers. More...
static void *	vlib_buffer_pull (vlib_buffer_t *b, u8 size)
	Retrieve bytes from buffer head. More...
void	vlib_buffer_add_mem_range (struct vlib_main_t *vm, uword start, uword size)
clib_error_t *	vlib_buffer_main_init (struct vlib_main_t *vm)
void	serialize_open_vlib_buffer (serialize_main_t *m, struct vlib_main_t *vm, vlib_serialize_buffer_main_t *sm)
void	unserialize_open_vlib_buffer (serialize_main_t *m, struct vlib_main_t *vm, vlib_serialize_buffer_main_t *sm)
u32	serialize_close_vlib_buffer (serialize_main_t *m)
void	unserialize_close_vlib_buffer (serialize_main_t *m)
void *	vlib_set_buffer_free_callback (struct vlib_main_t *vm, void *fp)
static u32	serialize_vlib_buffer_n_bytes (serialize_main_t *m)

Variables
vlib_buffer_callbacks_t *	vlib_buffer_callbacks

Detailed Description

vlib buffer structure definition and a few select access methods.

This structure and the buffer allocation mechanism should perhaps live in vnet, but it would take a lot of typing to make it so.

Definition in file buffer.h.

Macro Definition Documentation

#define LOG2_VLIB_BUFFER_FLAG_USER

(

n

)

(32 - (n))

Definition at line 104 of file buffer.h.

#define VLIB_BUFFER_DATA_SIZE   (2048)

Definition at line 51 of file buffer.h.

#define VLIB_BUFFER_DEFAULT_FREE_LIST_BYTES   VLIB_BUFFER_DATA_SIZE

Definition at line 423 of file buffer.h.

#define VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX   (0)

Definition at line 422 of file buffer.h.

#define VLIB_BUFFER_EXT_HDR_VALID   (1 << 12)

Definition at line 101 of file buffer.h.

#define VLIB_BUFFER_FLAG_USER

(

n

)

(1 << LOG2_VLIB_BUFFER_FLAG_USER(n))

Definition at line 105 of file buffer.h.

#define VLIB_BUFFER_FLOW_REPORT   (1 << 11)

Definition at line 100 of file buffer.h.

#define VLIB_BUFFER_FREE_LIST_INDEX_MASK   ((1 << 5) - 1)

Definition at line 91 of file buffer.h.

#define VLIB_BUFFER_HDR_SIZE   (sizeof(vlib_buffer_t) - VLIB_BUFFER_PRE_DATA_SIZE)

Definition at line 160 of file buffer.h.

#define VLIB_BUFFER_IS_RECYCLED   (1 << 7)

Definition at line 96 of file buffer.h.

#define VLIB_BUFFER_IS_TRACED   (1 << 5)

Definition at line 93 of file buffer.h.

#define VLIB_BUFFER_LOG2_NEXT_PRESENT   (6)

Definition at line 94 of file buffer.h.

#define VLIB_BUFFER_NEXT_PRESENT   (1 << VLIB_BUFFER_LOG2_NEXT_PRESENT)

Definition at line 95 of file buffer.h.

#define VLIB_BUFFER_PRE_DATA_SIZE   __PRE_DATA_SIZE

Definition at line 52 of file buffer.h.

#define VLIB_BUFFER_RECYCLE   (1 << 10)

Definition at line 99 of file buffer.h.

#define VLIB_BUFFER_REGISTER_CALLBACKS	(		x,
			...
	)

Value:

__VA_ARGS__ vlib_buffer_callbacks_t __##x##_buffer_callbacks;       \
static void __vlib_add_buffer_callbacks_t_##x (void)                    \
    __attribute__((__constructor__)) ;                                  \
static void __vlib_add_buffer_callbacks_t_##x (void)                    \
{                                                                       \
    if (vlib_buffer_callbacks)                                          \
      clib_panic ("vlib buffer callbacks already registered");          \
    vlib_buffer_callbacks = &__##x##_buffer_callbacks;                  \
}                                                                       \
__VA_ARGS__ vlib_buffer_callbacks_t __##x##_buffer_callbacks

Definition at line 522 of file buffer.h.

#define VLIB_BUFFER_REPL_FAIL   (1 << 9)

Definition at line 98 of file buffer.h.

#define VLIB_BUFFER_TOTAL_LENGTH_VALID   (1 << 8)

Definition at line 97 of file buffer.h.

#define VLIB_BUFFER_TRACE_TRAJECTORY   0

Compile time buffer trajectory tracing option Turn this on if you run into "bad monkey" contexts, and you want to know exactly which nodes they've visited...

See vlib/main.c...

Definition at line 512 of file buffer.h.

#define VLIB_BUFFER_TRACE_TRAJECTORY_INIT

(

b

)

Definition at line 517 of file buffer.h.

#define vlib_prefetch_buffer_header	(		b,
			type
	)		CLIB_PREFETCH (b, 64, type)

Prefetch buffer metadata.

The first 64 bytes of buffer contains most header information

Parameters

b	- (vlib_buffer_t *) pointer to the buffer
type	- LOAD, STORE. In most cases, STORE is the right answer

Definition at line 169 of file buffer.h.

Typedef Documentation

typedef struct vlib_buffer_free_list_t vlib_buffer_free_list_t

Function Documentation

u32 serialize_close_vlib_buffer

(

serialize_main_t *

m

)

Definition at line 204 of file buffer_serialize.c.

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void serialize_open_vlib_buffer	(	serialize_main_t *	m,
		struct vlib_main_t *	vm,
		vlib_serialize_buffer_main_t *	sm
	)

Definition at line 190 of file buffer_serialize.c.

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static u32 serialize_vlib_buffer_n_bytes ( serialize_main_t *  m )

inlinestatic

Definition at line 494 of file buffer.h.

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void unserialize_close_vlib_buffer

(

serialize_main_t *

m

)

Definition at line 229 of file buffer_serialize.c.

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void unserialize_open_vlib_buffer	(	serialize_main_t *	m,
		struct vlib_main_t *	vm,
		vlib_serialize_buffer_main_t *	sm
	)

Definition at line 197 of file buffer_serialize.c.

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void vlib_buffer_add_mem_range	(	struct vlib_main_t *	vm,
		uword	start,
		uword	size
	)

Definition at line 964 of file buffer.c.

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static void vlib_buffer_advance ( vlib_buffer_t *  b, word  l  )

inlinestatic

Advance current data pointer by the supplied (signed!) amount.

Parameters

b	- (vlib_buffer_t *) pointer to the buffer
l	- (word) signed increment

Definition at line 206 of file buffer.h.

static void* vlib_buffer_get_current ( vlib_buffer_t *  b )

inlinestatic

Get pointer to current data to process.

Parameters

b	- (vlib_buffer_t *) pointer to the buffer

Returns

- (void *) (b->data + b->current_data)

Definition at line 193 of file buffer.h.

static u8* vlib_buffer_get_tail ( vlib_buffer_t *  b )

inlinestatic

Get pointer to the end of buffer's data.

Parameters

b	pointer to the buffer

Returns

pointer to tail of packet's data

Definition at line 265 of file buffer.h.

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static u8 vlib_buffer_has_space ( vlib_buffer_t *  b, word  l  )

inlinestatic

Check if there is enough space in buffer to advance.

Parameters

b	- (vlib_buffer_t *) pointer to the buffer
l	- (word) size to check

Returns

- 0 if there is less space than 'l' in buffer

Definition at line 220 of file buffer.h.

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clib_error_t* vlib_buffer_main_init

(

struct vlib_main_t *

vm

)

Definition at line 1057 of file buffer.c.

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static void* vlib_buffer_make_headroom ( vlib_buffer_t *  b, u8  size  )

inlinestatic

Make head room, typically for packet headers.

Parameters

b	pointer to the buffer
size	number of head room bytes

Returns

pointer to start of buffer (current data)

Definition at line 305 of file buffer.h.

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static vlib_buffer_t* vlib_buffer_next_contiguous ( vlib_buffer_t *  b, u32  buffer_bytes  )

inlinestatic

Definition at line 172 of file buffer.h.

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static void* vlib_buffer_pull ( vlib_buffer_t *  b, u8  size  )

inlinestatic

Retrieve bytes from buffer head.

Parameters

b	pointer to the buffer
size	number of bytes to pull

Returns

pointer to start of buffer (current data)

Definition at line 318 of file buffer.h.

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static void* vlib_buffer_push_uninit ( vlib_buffer_t *  b, u8  size  )

inlinestatic

Prepend uninitialized data to buffer.

Parameters

b	pointer to the buffer
size	number of uninitialized bytes

Returns

pointer to beginning of uninitialized data

Definition at line 290 of file buffer.h.

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static void* vlib_buffer_put_uninit ( vlib_buffer_t *  b, u8  size  )

inlinestatic

Append uninitialized data to buffer.

Parameters

b	pointer to the buffer
size	number of uninitialized bytes

Returns

pointer to beginning of uninitialized data

Definition at line 276 of file buffer.h.

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static void vlib_buffer_reset ( vlib_buffer_t *  b )

inlinestatic

Reset current header & length to state they were in when packet was received.

Parameters

b	- (vlib_buffer_t *) pointer to the buffer

Definition at line 232 of file buffer.h.

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static void vlib_buffer_struct_is_sane ( vlib_buffer_t *  b )

inlinestatic

Definition at line 178 of file buffer.h.

static void* vlib_get_buffer_opaque ( vlib_buffer_t *  b )

inlinestatic

Get pointer to buffer's opaque data array.

Parameters

b	- (vlib_buffer_t *) pointer to the buffer

Returns

- (void *) b->opaque

Definition at line 244 of file buffer.h.

static void* vlib_get_buffer_opaque2 ( vlib_buffer_t *  b )

inlinestatic

Get pointer to buffer's opaque2 data array.

Parameters

b	- (vlib_buffer_t *) pointer to the buffer

Returns

- (void *) b->opaque2

Definition at line 255 of file buffer.h.

void* vlib_set_buffer_free_callback	(	struct vlib_main_t *	vm,
		void *	fp
	)

Definition at line 655 of file buffer.c.

Variable Documentation

vlib_buffer_callbacks_t* vlib_buffer_callbacks

Definition at line 49 of file buffer.c.