VLIB buffer representation. More...

Data Fields
struct {
i16 current_data
	signed offset in data[], pre_data[] that we are currently processing. More...

u16 current_length
	Nbytes between current data and the end of this buffer. More...

u32 flags
	buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer. More...

u32 flow_id
	Generic flow identifier. More...

volatile u8 ref_count
	Reference count for this buffer. More...

u8 buffer_pool_index
	index of buffer pool this buffer belongs. More...

vlib_error_t error
	Error code for buffers to be enqueued to error handler. More...

u32 next_buffer
	Next buffer for this linked-list of buffers. More...

union {
u32 current_config_index
	Used by feature subgraph arcs to visit enabled feature nodes. More...

u32 punt_reason

}
	The following fields can be in a union because once a packet enters the punt path, it is no longer on a feature arc. More...

u32 opaque [10]
	Opaque data used by sub-graphs for their own purposes. More...

u32 trace_handle
	Specifies trace buffer handle if VLIB_PACKET_IS_TRACED flag is set. More...

u32 total_length_not_including_first_buffer
	Only valid for first buffer in chain. More...

u32 opaque2 [14]

u8 pre_data [VLIB_BUFFER_PRE_DATA_SIZE]
	Space for inserting data before buffer start. More...

u8 data []
	Packet data. More...

};

Detailed Description

VLIB buffer representation.

Definition at line 111 of file buffer.h.

Field Documentation

◆ @615

struct { ... }

◆ buffer_pool_index

u8 vlib_buffer_t::buffer_pool_index

index of buffer pool this buffer belongs.

Definition at line 142 of file buffer.h.

◆ current_config_index

u32 vlib_buffer_t::current_config_index

Used by feature subgraph arcs to visit enabled feature nodes.

Definition at line 156 of file buffer.h.

◆ current_data

i16 vlib_buffer_t::current_data

signed offset in data[], pre_data[] that we are currently processing.

If negative current header points into predata area.

Definition at line 119 of file buffer.h.

◆ current_length

u16 vlib_buffer_t::current_length

Nbytes between current data and the end of this buffer.

Definition at line 122 of file buffer.h.

◆ data

u8 vlib_buffer_t::data[]

Packet data.

Definition at line 204 of file buffer.h.

◆ error

vlib_error_t vlib_buffer_t::error

Error code for buffers to be enqueued to error handler.

Definition at line 145 of file buffer.h.

◆ flags

u32 vlib_buffer_t::flags

buffer flags:
VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index,
VLIB_BUFFER_IS_TRACED: trace this buffer.

VLIB_BUFFER_NEXT_PRESENT: this is a multi-chunk buffer.
VLIB_BUFFER_TOTAL_LENGTH_VALID: as it says
VLIB_BUFFER_EXT_HDR_VALID: buffer contains valid external buffer manager header, set to avoid adding it to a flow report
VLIB_BUFFER_FLAG_USER(n): user-defined bit N

Definition at line 133 of file buffer.h.

◆ flow_id

u32 vlib_buffer_t::flow_id

Generic flow identifier.

Definition at line 136 of file buffer.h.

◆ next_buffer

u32 vlib_buffer_t::next_buffer

Next buffer for this linked-list of buffers.

Only valid if VLIB_BUFFER_NEXT_PRESENT flag is set.

Definition at line 149 of file buffer.h.

◆ opaque

u32 vlib_buffer_t::opaque[10]

Opaque data used by sub-graphs for their own purposes.

Definition at line 162 of file buffer.h.

◆ opaque2

u32 vlib_buffer_t::opaque2[14]

Definition at line 179 of file buffer.h.

◆ pre_data

u8 vlib_buffer_t::pre_data[VLIB_BUFFER_PRE_DATA_SIZE]

Space for inserting data before buffer start.

Packet rewrite string will be rewritten backwards and may extend back before buffer->data[0]. Must come directly before packet data.

Definition at line 201 of file buffer.h.

◆ punt_reason

u32 vlib_buffer_t::punt_reason

Definition at line 158 of file buffer.h.

◆ ref_count

volatile u8 vlib_buffer_t::ref_count

Reference count for this buffer.

Definition at line 139 of file buffer.h.

◆ total_length_not_including_first_buffer

u32 vlib_buffer_t::total_length_not_including_first_buffer

Only valid for first buffer in chain.

Current length plus total length given here give total number of bytes in buffer chain. More opaque data, see ../vnet/vnet/buffer.h

Definition at line 176 of file buffer.h.

◆ trace_handle

u32 vlib_buffer_t::trace_handle

Specifies trace buffer handle if VLIB_PACKET_IS_TRACED flag is set.

Definition at line 172 of file buffer.h.

The documentation for this union was generated from the following file:

src/vlib/buffer.h

Data Fields