390 строки
10 KiB
C
390 строки
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
|
|
/* Copyright (c) 2019 Mellanox Technologies. */
|
|
|
|
#ifndef DIM_H
|
|
#define DIM_H
|
|
|
|
#include <linux/module.h>
|
|
|
|
/**
|
|
* Number of events between DIM iterations.
|
|
* Causes a moderation of the algorithm run.
|
|
*/
|
|
#define DIM_NEVENTS 64
|
|
|
|
/**
|
|
* Is a difference between values justifies taking an action.
|
|
* We consider 10% difference as significant.
|
|
*/
|
|
#define IS_SIGNIFICANT_DIFF(val, ref) \
|
|
(((100UL * abs((val) - (ref))) / (ref)) > 10)
|
|
|
|
/**
|
|
* Calculate the gap between two values.
|
|
* Take wrap-around and variable size into consideration.
|
|
*/
|
|
#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) \
|
|
& (BIT_ULL(bits) - 1))
|
|
|
|
/**
|
|
* Structure for CQ moderation values.
|
|
* Used for communications between DIM and its consumer.
|
|
*
|
|
* @usec: CQ timer suggestion (by DIM)
|
|
* @pkts: CQ packet counter suggestion (by DIM)
|
|
* @cq_period_mode: CQ priod count mode (from CQE/EQE)
|
|
*/
|
|
struct dim_cq_moder {
|
|
u16 usec;
|
|
u16 pkts;
|
|
u16 comps;
|
|
u8 cq_period_mode;
|
|
};
|
|
|
|
/**
|
|
* Structure for DIM sample data.
|
|
* Used for communications between DIM and its consumer.
|
|
*
|
|
* @time: Sample timestamp
|
|
* @pkt_ctr: Number of packets
|
|
* @byte_ctr: Number of bytes
|
|
* @event_ctr: Number of events
|
|
*/
|
|
struct dim_sample {
|
|
ktime_t time;
|
|
u32 pkt_ctr;
|
|
u32 byte_ctr;
|
|
u16 event_ctr;
|
|
u32 comp_ctr;
|
|
};
|
|
|
|
/**
|
|
* Structure for DIM stats.
|
|
* Used for holding current measured rates.
|
|
*
|
|
* @ppms: Packets per msec
|
|
* @bpms: Bytes per msec
|
|
* @epms: Events per msec
|
|
*/
|
|
struct dim_stats {
|
|
int ppms; /* packets per msec */
|
|
int bpms; /* bytes per msec */
|
|
int epms; /* events per msec */
|
|
int cpms; /* completions per msec */
|
|
int cpe_ratio; /* ratio of completions to events */
|
|
};
|
|
|
|
/**
|
|
* Main structure for dynamic interrupt moderation (DIM).
|
|
* Used for holding all information about a specific DIM instance.
|
|
*
|
|
* @state: Algorithm state (see below)
|
|
* @prev_stats: Measured rates from previous iteration (for comparison)
|
|
* @start_sample: Sampled data at start of current iteration
|
|
* @work: Work to perform on action required
|
|
* @priv: A pointer to the struct that points to dim
|
|
* @profile_ix: Current moderation profile
|
|
* @mode: CQ period count mode
|
|
* @tune_state: Algorithm tuning state (see below)
|
|
* @steps_right: Number of steps taken towards higher moderation
|
|
* @steps_left: Number of steps taken towards lower moderation
|
|
* @tired: Parking depth counter
|
|
*/
|
|
struct dim {
|
|
u8 state;
|
|
struct dim_stats prev_stats;
|
|
struct dim_sample start_sample;
|
|
struct dim_sample measuring_sample;
|
|
struct work_struct work;
|
|
void *priv;
|
|
u8 profile_ix;
|
|
u8 mode;
|
|
u8 tune_state;
|
|
u8 steps_right;
|
|
u8 steps_left;
|
|
u8 tired;
|
|
};
|
|
|
|
/**
|
|
* enum dim_cq_period_mode
|
|
*
|
|
* These are the modes for CQ period count.
|
|
*
|
|
* @DIM_CQ_PERIOD_MODE_START_FROM_EQE: Start counting from EQE
|
|
* @DIM_CQ_PERIOD_MODE_START_FROM_CQE: Start counting from CQE (implies timer reset)
|
|
* @DIM_CQ_PERIOD_NUM_MODES: Number of modes
|
|
*/
|
|
enum {
|
|
DIM_CQ_PERIOD_MODE_START_FROM_EQE = 0x0,
|
|
DIM_CQ_PERIOD_MODE_START_FROM_CQE = 0x1,
|
|
DIM_CQ_PERIOD_NUM_MODES
|
|
};
|
|
|
|
/**
|
|
* enum dim_state
|
|
*
|
|
* These are the DIM algorithm states.
|
|
* These will determine if the algorithm is in a valid state to start an iteration.
|
|
*
|
|
* @DIM_START_MEASURE: This is the first iteration (also after applying a new profile)
|
|
* @DIM_MEASURE_IN_PROGRESS: Algorithm is already in progress - check if
|
|
* need to perform an action
|
|
* @DIM_APPLY_NEW_PROFILE: DIM consumer is currently applying a profile - no need to measure
|
|
*/
|
|
enum {
|
|
DIM_START_MEASURE,
|
|
DIM_MEASURE_IN_PROGRESS,
|
|
DIM_APPLY_NEW_PROFILE,
|
|
};
|
|
|
|
/**
|
|
* enum dim_tune_state
|
|
*
|
|
* These are the DIM algorithm tune states.
|
|
* These will determine which action the algorithm should perform.
|
|
*
|
|
* @DIM_PARKING_ON_TOP: Algorithm found a local top point - exit on significant difference
|
|
* @DIM_PARKING_TIRED: Algorithm found a deep top point - don't exit if tired > 0
|
|
* @DIM_GOING_RIGHT: Algorithm is currently trying higher moderation levels
|
|
* @DIM_GOING_LEFT: Algorithm is currently trying lower moderation levels
|
|
*/
|
|
enum {
|
|
DIM_PARKING_ON_TOP,
|
|
DIM_PARKING_TIRED,
|
|
DIM_GOING_RIGHT,
|
|
DIM_GOING_LEFT,
|
|
};
|
|
|
|
/**
|
|
* enum dim_stats_state
|
|
*
|
|
* These are the DIM algorithm statistics states.
|
|
* These will determine the verdict of current iteration.
|
|
*
|
|
* @DIM_STATS_WORSE: Current iteration shows worse performance than before
|
|
* @DIM_STATS_WORSE: Current iteration shows same performance than before
|
|
* @DIM_STATS_WORSE: Current iteration shows better performance than before
|
|
*/
|
|
enum {
|
|
DIM_STATS_WORSE,
|
|
DIM_STATS_SAME,
|
|
DIM_STATS_BETTER,
|
|
};
|
|
|
|
/**
|
|
* enum dim_step_result
|
|
*
|
|
* These are the DIM algorithm step results.
|
|
* These describe the result of a step.
|
|
*
|
|
* @DIM_STEPPED: Performed a regular step
|
|
* @DIM_TOO_TIRED: Same kind of step was done multiple times - should go to
|
|
* tired parking
|
|
* @DIM_ON_EDGE: Stepped to the most left/right profile
|
|
*/
|
|
enum {
|
|
DIM_STEPPED,
|
|
DIM_TOO_TIRED,
|
|
DIM_ON_EDGE,
|
|
};
|
|
|
|
/**
|
|
* dim_on_top - check if current state is a good place to stop (top location)
|
|
* @dim: DIM context
|
|
*
|
|
* Check if current profile is a good place to park at.
|
|
* This will result in reducing the DIM checks frequency as we assume we
|
|
* shouldn't probably change profiles, unless traffic pattern wasn't changed.
|
|
*/
|
|
bool dim_on_top(struct dim *dim);
|
|
|
|
/**
|
|
* dim_turn - change profile alterning direction
|
|
* @dim: DIM context
|
|
*
|
|
* Go left if we were going right and vice-versa.
|
|
* Do nothing if currently parking.
|
|
*/
|
|
void dim_turn(struct dim *dim);
|
|
|
|
/**
|
|
* dim_park_on_top - enter a parking state on a top location
|
|
* @dim: DIM context
|
|
*
|
|
* Enter parking state.
|
|
* Clear all movement history.
|
|
*/
|
|
void dim_park_on_top(struct dim *dim);
|
|
|
|
/**
|
|
* dim_park_tired - enter a tired parking state
|
|
* @dim: DIM context
|
|
*
|
|
* Enter parking state.
|
|
* Clear all movement history and cause DIM checks frequency to reduce.
|
|
*/
|
|
void dim_park_tired(struct dim *dim);
|
|
|
|
/**
|
|
* dim_calc_stats - calculate the difference between two samples
|
|
* @start: start sample
|
|
* @end: end sample
|
|
* @curr_stats: delta between samples
|
|
*
|
|
* Calculate the delta between two samples (in data rates).
|
|
* Takes into consideration counter wrap-around.
|
|
*/
|
|
void dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
|
|
struct dim_stats *curr_stats);
|
|
|
|
/**
|
|
* dim_update_sample - set a sample's fields with give values
|
|
* @event_ctr: number of events to set
|
|
* @packets: number of packets to set
|
|
* @bytes: number of bytes to set
|
|
* @s: DIM sample
|
|
*/
|
|
static inline void
|
|
dim_update_sample(u16 event_ctr, u64 packets, u64 bytes, struct dim_sample *s)
|
|
{
|
|
s->time = ktime_get();
|
|
s->pkt_ctr = packets;
|
|
s->byte_ctr = bytes;
|
|
s->event_ctr = event_ctr;
|
|
}
|
|
|
|
/**
|
|
* dim_update_sample_with_comps - set a sample's fields with given
|
|
* values including the completion parameter
|
|
* @event_ctr: number of events to set
|
|
* @packets: number of packets to set
|
|
* @bytes: number of bytes to set
|
|
* @comps: number of completions to set
|
|
* @s: DIM sample
|
|
*/
|
|
static inline void
|
|
dim_update_sample_with_comps(u16 event_ctr, u64 packets, u64 bytes, u64 comps,
|
|
struct dim_sample *s)
|
|
{
|
|
dim_update_sample(event_ctr, packets, bytes, s);
|
|
s->comp_ctr = comps;
|
|
}
|
|
|
|
/* Net DIM */
|
|
|
|
/*
|
|
* Net DIM profiles:
|
|
* There are different set of profiles for each CQ period mode.
|
|
* There are different set of profiles for RX/TX CQs.
|
|
* Each profile size must be of NET_DIM_PARAMS_NUM_PROFILES
|
|
*/
|
|
#define NET_DIM_PARAMS_NUM_PROFILES 5
|
|
#define NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256
|
|
#define NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE 128
|
|
#define NET_DIM_DEF_PROFILE_CQE 1
|
|
#define NET_DIM_DEF_PROFILE_EQE 1
|
|
|
|
#define NET_DIM_RX_EQE_PROFILES { \
|
|
{1, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{8, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{64, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{128, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{256, NET_DIM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
}
|
|
|
|
#define NET_DIM_RX_CQE_PROFILES { \
|
|
{2, 256}, \
|
|
{8, 128}, \
|
|
{16, 64}, \
|
|
{32, 64}, \
|
|
{64, 64} \
|
|
}
|
|
|
|
#define NET_DIM_TX_EQE_PROFILES { \
|
|
{1, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{8, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{32, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{64, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE}, \
|
|
{128, NET_DIM_DEFAULT_TX_CQ_MODERATION_PKTS_FROM_EQE} \
|
|
}
|
|
|
|
#define NET_DIM_TX_CQE_PROFILES { \
|
|
{5, 128}, \
|
|
{8, 64}, \
|
|
{16, 32}, \
|
|
{32, 32}, \
|
|
{64, 32} \
|
|
}
|
|
|
|
static const struct dim_cq_moder
|
|
rx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
|
|
NET_DIM_RX_EQE_PROFILES,
|
|
NET_DIM_RX_CQE_PROFILES,
|
|
};
|
|
|
|
static const struct dim_cq_moder
|
|
tx_profile[DIM_CQ_PERIOD_NUM_MODES][NET_DIM_PARAMS_NUM_PROFILES] = {
|
|
NET_DIM_TX_EQE_PROFILES,
|
|
NET_DIM_TX_CQE_PROFILES,
|
|
};
|
|
|
|
/**
|
|
* net_dim_get_rx_moderation - provide a CQ moderation object for the given RX profile
|
|
* @cq_period_mode: CQ period mode
|
|
* @ix: Profile index
|
|
*/
|
|
struct dim_cq_moder net_dim_get_rx_moderation(u8 cq_period_mode, int ix);
|
|
|
|
/**
|
|
* net_dim_get_def_rx_moderation - provide the default RX moderation
|
|
* @cq_period_mode: CQ period mode
|
|
*/
|
|
struct dim_cq_moder net_dim_get_def_rx_moderation(u8 cq_period_mode);
|
|
|
|
/**
|
|
* net_dim_get_tx_moderation - provide a CQ moderation object for the given TX profile
|
|
* @cq_period_mode: CQ period mode
|
|
* @ix: Profile index
|
|
*/
|
|
struct dim_cq_moder net_dim_get_tx_moderation(u8 cq_period_mode, int ix);
|
|
|
|
/**
|
|
* net_dim_get_def_tx_moderation - provide the default TX moderation
|
|
* @cq_period_mode: CQ period mode
|
|
*/
|
|
struct dim_cq_moder net_dim_get_def_tx_moderation(u8 cq_period_mode);
|
|
|
|
/**
|
|
* net_dim - main DIM algorithm entry point
|
|
* @dim: DIM instance information
|
|
* @end_sample: Current data measurement
|
|
*
|
|
* Called by the consumer.
|
|
* This is the main logic of the algorithm, where data is processed in order to decide on next
|
|
* required action.
|
|
*/
|
|
void net_dim(struct dim *dim, struct dim_sample end_sample);
|
|
|
|
/* RDMA DIM */
|
|
|
|
/*
|
|
* RDMA DIM profile:
|
|
* profile size must be of RDMA_DIM_PARAMS_NUM_PROFILES.
|
|
*/
|
|
#define RDMA_DIM_PARAMS_NUM_PROFILES 9
|
|
#define RDMA_DIM_START_PROFILE 0
|
|
|
|
/**
|
|
* rdma_dim - Runs the adaptive moderation.
|
|
* @dim: The moderation struct.
|
|
* @completions: The number of completions collected in this round.
|
|
*
|
|
* Each call to rdma_dim takes the latest amount of completions that
|
|
* have been collected and counts them as a new event.
|
|
* Once enough events have been collected the algorithm decides a new
|
|
* moderation level.
|
|
*/
|
|
void rdma_dim(struct dim *dim, u64 completions);
|
|
|
|
#endif /* DIM_H */
|