struct buffer_descriptor
Defined at line 40 of file ../../src/connectivity/lib/network-device/buffer_descriptor/buffer_descriptor.h
A buffer descriptor, which contains a region of the data VMO that can be used
to store data plus associated metadata.
The region of the VMO described by a buffer descriptor has the form:
| head | data | tail |.
The three regions have lengths |head_length|, |data_length|, |tail_length|
and always start |offset| bytes from the start of the data VMO.
A data-carrying buffer's payload is ALWAYS in the |data| region of the
described memory space, but the owner of the buffer is always guaranteed (by
the FIFO contract) to be the sole accessor of the entire allocated region.
When descriptors are chained using |chain_length| and |nxt|, |head_length|
may only be different than 0 for the first buffer and |tail_length| may only
be different than 0 for the last buffer.
Public Members
uint8_t frame_typeuint8_t chain_lengthuint16_t nxtuint32_t info_typeport_id port_iduint8_t[2] _reserveduint8_t[4] client_opaque_datauint64_t offsetuint16_t head_lengthuint16_t tail_lengthuint32_t data_lengthuint32_t inbound_flagsuint32_t return_flags