rte_bbdev_op_ldpc_dec(3)

NAME
rte_bbdev_op_ldpc_dec

SYNOPSIS

#include <rte_bbdev_op.h>

  Data Fields

struct rte_bbdev_op_data input
struct rte_bbdev_op_data hard_output
struct rte_bbdev_op_data soft_output
struct rte_bbdev_op_data harq_combined_input
struct rte_bbdev_op_data harq_combined_output
uint32_t op_flags
uint8_t rv_index
uint8_t iter_max
uint8_t iter_count
uint8_t basegraph
uint16_t z_c
uint16_t n_cb
uint8_t q_m
uint16_t n_filler
uint8_t code_block_mode
uint16_t k0

Detailed Description

Operation structure for LDPC decode.

An operation can be performed on one CB at a time "CB-mode". An operation can also be performed on one or multiple CBs that logically belong to a TB "TB-mode" (Currently not supported).

The input encoded CB data is the Virtual Circular Buffer data stream.

Each byte in the input circular buffer is the LLR value of each bit of the original CB.

Hard output is a mandatory capability that all BBDEV PMDs support. This is the decoded CBs (CRC24A/B is the last 24-bit in each decoded CB).

Soft output is an optional capability for BBDEV PMDs. If supported, an LLR rate matched output is computed in the soft_output buffer structure. These are A Posteriori Probabilities (APP) LLR samples for coded bits.

HARQ combined output is an optional capability for BBDEV PMDs. If supported, a LLR output is streamed to the harq_combined_output buffer.

HARQ combined input is an optional capability for BBDEV PMDs. If supported, a LLR input is streamed from the harq_combined_input buffer.

The output mbuf data structure is expected to be allocated by the application with enough room for the output data.

Definition at line 506 of file rte_bbdev_op.h.

Field Documentation

  struct rte_bbdev_op_data input
The Virtual Circular Buffer for this code block, one LLR per bit of the original CB.

Definition at line 510 of file rte_bbdev_op.h.

  struct rte_bbdev_op_data hard_output
The hard decisions buffer for the decoded output, size K for each CB

Definition at line 514 of file rte_bbdev_op.h.

  struct rte_bbdev_op_data soft_output
The soft LLR output LLR stream buffer - optional

Definition at line 516 of file rte_bbdev_op.h.

  struct rte_bbdev_op_data harq_combined_input
The HARQ combined LLR stream input buffer - optional

Definition at line 518 of file rte_bbdev_op.h.

  struct rte_bbdev_op_data harq_combined_output
The HARQ combined LLR stream output buffer - optional

Definition at line 520 of file rte_bbdev_op.h.

  uint32_t op_flags
Flags from rte_bbdev_op_ldpcdec_flag_bitmasks

Definition at line 523 of file rte_bbdev_op.h.

  uint8_t rv_index
Rate matching redundancy version [3GPP TS38.212, section 5.4.2.1]

Definition at line 528 of file rte_bbdev_op.h.

  uint8_t iter_max
The maximum number of iterations to perform in decoding CB in this operation - input

Definition at line 532 of file rte_bbdev_op.h.

  uint8_t iter_count
The number of iterations that were performed in decoding CB in this decode operation - output

Definition at line 536 of file rte_bbdev_op.h.

  uint8_t basegraph
1: LDPC Base graph 1, 2: LDPC Base graph 2. [3GPP TS38.212, section 5.2.2]

Definition at line 540 of file rte_bbdev_op.h.

  uint16_t z_c
Zc, LDPC lifting size. [3GPP TS38.212, section 5.2.2]

Definition at line 544 of file rte_bbdev_op.h.

  uint16_t n_cb
Ncb, length of the circular buffer in bits. [3GPP TS38.212, section 5.4.2.1]

Definition at line 548 of file rte_bbdev_op.h.

  uint8_t q_m
Qm, modulation order {1,2,4,6,8}. [3GPP TS38.212, section 5.4.2.2]

Definition at line 552 of file rte_bbdev_op.h.

  uint16_t n_filler
Number of Filler bits, n_filler = K – K’ [3GPP TS38.212 section 5.2.2]

Definition at line 556 of file rte_bbdev_op.h.

  uint8_t code_block_mode
[0 - TB : 1 - CB]

Definition at line 558 of file rte_bbdev_op.h.

  struct rte_bbdev_op_dec_ldpc_cb_params cb_params
Struct which stores Code Block specific parameters

Definition at line 561 of file rte_bbdev_op.h.

  struct rte_bbdev_op_dec_ldpc_tb_params tb_params
Struct which stores Transport Block specific parameters

Definition at line 563 of file rte_bbdev_op.h.

  uint16_t k0
Optional k0 Rate matching starting position, overrides rv_index when non null [3GPP TS38.212, section 5.4.2.1]

Definition at line 568 of file rte_bbdev_op.h.

Author

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