154 lines
3.1 KiB
C
154 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
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/* Copyright (c) 2019 Mellanox Technologies. */
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#ifndef DIM_H
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#define DIM_H
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#include <linux/module.h>
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#define DIM_NEVENTS 64
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/* more than 10% difference */
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#define IS_SIGNIFICANT_DIFF(val, ref) \
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(((100UL * abs((val) - (ref))) / (ref)) > 10)
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#define BIT_GAP(bits, end, start) ((((end) - (start)) + BIT_ULL(bits)) \
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& (BIT_ULL(bits) - 1))
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struct net_dim_cq_moder {
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u16 usec;
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u16 pkts;
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u8 cq_period_mode;
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};
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struct net_dim_sample {
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ktime_t time;
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u32 pkt_ctr;
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u32 byte_ctr;
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u16 event_ctr;
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};
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struct dim_stats {
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int ppms; /* packets per msec */
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int bpms; /* bytes per msec */
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int epms; /* events per msec */
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};
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struct net_dim { /* Dynamic Interrupt Moderation */
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u8 state;
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struct dim_stats prev_stats;
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struct net_dim_sample start_sample;
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struct work_struct work;
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u8 profile_ix;
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u8 mode;
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u8 tune_state;
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u8 steps_right;
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u8 steps_left;
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u8 tired;
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};
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enum {
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DIM_CQ_PERIOD_MODE_START_FROM_EQE = 0x0,
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DIM_CQ_PERIOD_MODE_START_FROM_CQE = 0x1,
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DIM_CQ_PERIOD_NUM_MODES
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};
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enum {
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DIM_START_MEASURE,
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DIM_MEASURE_IN_PROGRESS,
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DIM_APPLY_NEW_PROFILE,
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};
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enum {
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DIM_PARKING_ON_TOP,
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DIM_PARKING_TIRED,
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DIM_GOING_RIGHT,
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DIM_GOING_LEFT,
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};
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enum {
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DIM_STATS_WORSE,
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DIM_STATS_SAME,
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DIM_STATS_BETTER,
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};
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enum {
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DIM_STEPPED,
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DIM_TOO_TIRED,
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DIM_ON_EDGE,
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};
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static inline bool dim_on_top(struct net_dim *dim)
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{
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switch (dim->tune_state) {
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case DIM_PARKING_ON_TOP:
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case DIM_PARKING_TIRED:
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return true;
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case DIM_GOING_RIGHT:
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return (dim->steps_left > 1) && (dim->steps_right == 1);
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default: /* DIM_GOING_LEFT */
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return (dim->steps_right > 1) && (dim->steps_left == 1);
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}
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}
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static inline void dim_turn(struct net_dim *dim)
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{
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switch (dim->tune_state) {
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case DIM_PARKING_ON_TOP:
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case DIM_PARKING_TIRED:
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break;
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case DIM_GOING_RIGHT:
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dim->tune_state = DIM_GOING_LEFT;
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dim->steps_left = 0;
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break;
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case DIM_GOING_LEFT:
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dim->tune_state = DIM_GOING_RIGHT;
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dim->steps_right = 0;
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break;
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}
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}
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static inline void dim_park_on_top(struct net_dim *dim)
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{
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dim->steps_right = 0;
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dim->steps_left = 0;
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dim->tired = 0;
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dim->tune_state = DIM_PARKING_ON_TOP;
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}
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static inline void dim_park_tired(struct net_dim *dim)
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{
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dim->steps_right = 0;
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dim->steps_left = 0;
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dim->tune_state = DIM_PARKING_TIRED;
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}
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static inline void
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net_dim_sample(u16 event_ctr, u64 packets, u64 bytes, struct net_dim_sample *s)
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{
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s->time = ktime_get();
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s->pkt_ctr = packets;
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s->byte_ctr = bytes;
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s->event_ctr = event_ctr;
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}
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static inline void
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dim_calc_stats(struct net_dim_sample *start, struct net_dim_sample *end,
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struct dim_stats *curr_stats)
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{
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/* u32 holds up to 71 minutes, should be enough */
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u32 delta_us = ktime_us_delta(end->time, start->time);
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u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
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u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
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start->byte_ctr);
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if (!delta_us)
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return;
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curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
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curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
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curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC,
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delta_us);
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}
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#endif /* DIM_H */
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