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- // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
- /*
- * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
- */
- #include <linux/dim.h>
- bool dim_on_top(struct dim *dim)
- {
- switch (dim->tune_state) {
- case DIM_PARKING_ON_TOP:
- case DIM_PARKING_TIRED:
- return true;
- case DIM_GOING_RIGHT:
- return (dim->steps_left > 1) && (dim->steps_right == 1);
- default: /* DIM_GOING_LEFT */
- return (dim->steps_right > 1) && (dim->steps_left == 1);
- }
- }
- EXPORT_SYMBOL(dim_on_top);
- void dim_turn(struct dim *dim)
- {
- switch (dim->tune_state) {
- case DIM_PARKING_ON_TOP:
- case DIM_PARKING_TIRED:
- break;
- case DIM_GOING_RIGHT:
- dim->tune_state = DIM_GOING_LEFT;
- dim->steps_left = 0;
- break;
- case DIM_GOING_LEFT:
- dim->tune_state = DIM_GOING_RIGHT;
- dim->steps_right = 0;
- break;
- }
- }
- EXPORT_SYMBOL(dim_turn);
- void dim_park_on_top(struct dim *dim)
- {
- dim->steps_right = 0;
- dim->steps_left = 0;
- dim->tired = 0;
- dim->tune_state = DIM_PARKING_ON_TOP;
- }
- EXPORT_SYMBOL(dim_park_on_top);
- void dim_park_tired(struct dim *dim)
- {
- dim->steps_right = 0;
- dim->steps_left = 0;
- dim->tune_state = DIM_PARKING_TIRED;
- }
- EXPORT_SYMBOL(dim_park_tired);
- bool dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
- struct dim_stats *curr_stats)
- {
- /* u32 holds up to 71 minutes, should be enough */
- u32 delta_us = ktime_us_delta(end->time, start->time);
- u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
- u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
- start->byte_ctr);
- u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32), end->comp_ctr,
- start->comp_ctr);
- if (!delta_us)
- return false;
- curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
- curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
- curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC,
- delta_us);
- curr_stats->cpms = DIV_ROUND_UP(ncomps * USEC_PER_MSEC, delta_us);
- if (curr_stats->epms != 0)
- curr_stats->cpe_ratio = DIV_ROUND_DOWN_ULL(
- curr_stats->cpms * 100, curr_stats->epms);
- else
- curr_stats->cpe_ratio = 0;
- return true;
- }
- EXPORT_SYMBOL(dim_calc_stats);
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