Provided by: dpdk-doc_24.11.2-2_all 
NAME
rte_pie.h
SYNOPSIS
#include <stdint.h>
#include <rte_random.h>
#include <rte_debug.h>
#include <rte_cycles.h>
Data Structures
struct rte_pie_params
struct rte_pie_config
struct rte_pie
Macros
#define RTE_DQ_THRESHOLD 16384
#define RTE_DQ_WEIGHT 0.25
#define RTE_ALPHA 0.125
#define RTE_BETA 1.25
#define RTE_RAND_MAX ~0LLU
Functions
int rte_pie_rt_data_init (struct rte_pie *pie)
Initialises run-time data.
int rte_pie_config_init (struct rte_pie_config *pie_cfg, const uint16_t qdelay_ref, const uint16_t
dp_update_interval, const uint16_t max_burst, const uint16_t tailq_th)
Configures a single PIE configuration parameter structure.
static int rte_pie_enqueue_empty (const struct rte_pie_config *pie_cfg, struct rte_pie *pie, uint32_t
pkt_len)
Decides packet enqueue when queue is empty.
static void _calc_drop_probability (const struct rte_pie_config *pie_cfg, struct rte_pie *pie, uint64_t
time)
make a decision to drop or enqueue a packet based on probability criteria
static int _rte_pie_drop (const struct rte_pie_config *pie_cfg, struct rte_pie *pie)
make a decision to drop or enqueue a packet based on probability criteria
static int rte_pie_enqueue_nonempty (const struct rte_pie_config *pie_cfg, struct rte_pie *pie, uint32_t
pkt_len, const uint64_t time)
Decides if new packet should be enqueued or dropped for non-empty queue.
static int rte_pie_enqueue (const struct rte_pie_config *pie_cfg, struct rte_pie *pie, const unsigned int
qlen, uint32_t pkt_len, const uint64_t time)
Decides if new packet should be enqueued or dropped Updates run time data and gives verdict whether
to enqueue or drop the packet.
static void rte_pie_dequeue (struct rte_pie *pie, uint32_t pkt_len, uint64_t time)
PIE rate estimation method Called on each packet departure.
Detailed Description
Proportional Integral controller Enhanced (PIE)
Definition in file rte_pie.h.
Macro Definition Documentation
#define RTE_DQ_THRESHOLD 16384
Queue length threshold (2^14) to start measurement cycle (bytes)
Definition at line 25 of file rte_pie.h.
#define RTE_DQ_WEIGHT 0.25
Weight (RTE_DQ_THRESHOLD/2^16) to compute dequeue rate
Definition at line 26 of file rte_pie.h.
#define RTE_ALPHA 0.125
Weights in drop probability calculations
Definition at line 27 of file rte_pie.h.
#define RTE_BETA 1.25
Weights in drop probability calculations
Definition at line 28 of file rte_pie.h.
#define RTE_RAND_MAX ~0LLU
Max value of the random number
Definition at line 29 of file rte_pie.h.
Function Documentation
int rte_pie_rt_data_init (struct rte_pie * pie)
Initialises run-time data.
Parameters
pie [in,out] data pointer to PIE runtime data
Returns
Operation status
Return values
0 success
!0 error
int rte_pie_config_init (struct rte_pie_config * pie_cfg, const uint16_t qdelay_ref, const uint16_t
dp_update_interval, const uint16_t max_burst, const uint16_t tailq_th)
Configures a single PIE configuration parameter structure.
Parameters
pie_cfg [in,out] config pointer to a PIE configuration parameter structure
qdelay_ref [in] latency target(milliseconds)
dp_update_interval [in] update interval for drop probability (milliseconds)
max_burst [in] maximum burst allowance (milliseconds)
tailq_th [in] tail drop threshold for the queue (number of packets)
Returns
Operation status
Return values
0 success
!0 error
static int rte_pie_enqueue_empty (const struct rte_pie_config * pie_cfg, struct rte_pie * pie, uint32_t
pkt_len) [static]
Decides packet enqueue when queue is empty. Note: packet is never dropped in this particular case.
Parameters
pie_cfg [in] config pointer to a PIE configuration parameter structure
pie [in, out] data pointer to PIE runtime data
pkt_len [in] packet length in bytes
Returns
Operation status
Return values
0 enqueue the packet
!0 drop the packet
If the queue has been idle for a while, turn off PIE and Reset counters
Definition at line 116 of file rte_pie.h.
static void _calc_drop_probability (const struct rte_pie_config * pie_cfg, struct rte_pie * pie, uint64_t
time) [static]
make a decision to drop or enqueue a packet based on probability criteria
Parameters
pie_cfg [in] config pointer to a PIE configuration parameter structure
pie [in, out] data pointer to PIE runtime data
time [in] current time (measured in cpu cycles)
Definition at line 147 of file rte_pie.h.
static int _rte_pie_drop (const struct rte_pie_config * pie_cfg, struct rte_pie * pie) [inline], [static]
make a decision to drop or enqueue a packet based on probability criteria
Parameters
pie_cfg [in] config pointer to a PIE configuration parameter structure
pie [in, out] data pointer to PIE runtime data
Returns
operation status
Return values
0 enqueue the packet
1 drop the packet
Definition at line 210 of file rte_pie.h.
static int rte_pie_enqueue_nonempty (const struct rte_pie_config * pie_cfg, struct rte_pie * pie, uint32_t
pkt_len, const uint64_t time) [inline], [static]
Decides if new packet should be enqueued or dropped for non-empty queue.
Parameters
pie_cfg [in] config pointer to a PIE configuration parameter structure
pie [in,out] data pointer to PIE runtime data
pkt_len [in] packet length in bytes
time [in] current time (measured in cpu cycles)
Returns
Operation status
Return values
0 enqueue the packet
1 drop the packet based on max threshold criterion
2 drop the packet based on mark probability criterion
Definition at line 258 of file rte_pie.h.
static int rte_pie_enqueue (const struct rte_pie_config * pie_cfg, struct rte_pie * pie, const unsigned int
qlen, uint32_t pkt_len, const uint64_t time) [inline], [static]
Decides if new packet should be enqueued or dropped Updates run time data and gives verdict whether to
enqueue or drop the packet.
Parameters
pie_cfg [in] config pointer to a PIE configuration parameter structure
pie [in,out] data pointer to PIE runtime data
qlen [in] queue length
pkt_len [in] packet length in bytes
time [in] current time stamp (measured in cpu cycles)
Returns
Operation status
Return values
0 enqueue the packet
1 drop the packet based on drop probability criteria
Definition at line 325 of file rte_pie.h.
static void rte_pie_dequeue (struct rte_pie * pie, uint32_t pkt_len, uint64_t time) [inline], [static]
PIE rate estimation method Called on each packet departure.
Parameters
pie [in] data pointer to PIE runtime data
pkt_len [in] packet length in bytes
time [in] current time stamp in cpu cycles
Definition at line 349 of file rte_pie.h.
Author
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DPDK Version 24.11.2 rte_pie.h(3)