1 | // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB |
2 | /* |
3 | * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved. |
4 | */ |
5 | |
6 | #include <linux/dim.h> |
7 | |
8 | bool dim_on_top(struct dim *dim) |
9 | { |
10 | switch (dim->tune_state) { |
11 | case DIM_PARKING_ON_TOP: |
12 | case DIM_PARKING_TIRED: |
13 | return true; |
14 | case DIM_GOING_RIGHT: |
15 | return (dim->steps_left > 1) && (dim->steps_right == 1); |
16 | default: /* DIM_GOING_LEFT */ |
17 | return (dim->steps_right > 1) && (dim->steps_left == 1); |
18 | } |
19 | } |
20 | EXPORT_SYMBOL(dim_on_top); |
21 | |
22 | void dim_turn(struct dim *dim) |
23 | { |
24 | switch (dim->tune_state) { |
25 | case DIM_PARKING_ON_TOP: |
26 | case DIM_PARKING_TIRED: |
27 | break; |
28 | case DIM_GOING_RIGHT: |
29 | dim->tune_state = DIM_GOING_LEFT; |
30 | dim->steps_left = 0; |
31 | break; |
32 | case DIM_GOING_LEFT: |
33 | dim->tune_state = DIM_GOING_RIGHT; |
34 | dim->steps_right = 0; |
35 | break; |
36 | } |
37 | } |
38 | EXPORT_SYMBOL(dim_turn); |
39 | |
40 | void dim_park_on_top(struct dim *dim) |
41 | { |
42 | dim->steps_right = 0; |
43 | dim->steps_left = 0; |
44 | dim->tired = 0; |
45 | dim->tune_state = DIM_PARKING_ON_TOP; |
46 | } |
47 | EXPORT_SYMBOL(dim_park_on_top); |
48 | |
49 | void dim_park_tired(struct dim *dim) |
50 | { |
51 | dim->steps_right = 0; |
52 | dim->steps_left = 0; |
53 | dim->tune_state = DIM_PARKING_TIRED; |
54 | } |
55 | EXPORT_SYMBOL(dim_park_tired); |
56 | |
57 | bool dim_calc_stats(struct dim_sample *start, struct dim_sample *end, |
58 | struct dim_stats *curr_stats) |
59 | { |
60 | /* u32 holds up to 71 minutes, should be enough */ |
61 | u32 delta_us = ktime_us_delta(later: end->time, earlier: start->time); |
62 | u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr); |
63 | u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr, |
64 | start->byte_ctr); |
65 | u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32), end->comp_ctr, |
66 | start->comp_ctr); |
67 | |
68 | if (!delta_us) |
69 | return false; |
70 | |
71 | curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us); |
72 | curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us); |
73 | curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC, |
74 | delta_us); |
75 | curr_stats->cpms = DIV_ROUND_UP(ncomps * USEC_PER_MSEC, delta_us); |
76 | if (curr_stats->epms != 0) |
77 | curr_stats->cpe_ratio = DIV_ROUND_DOWN_ULL( |
78 | curr_stats->cpms * 100, curr_stats->epms); |
79 | else |
80 | curr_stats->cpe_ratio = 0; |
81 | |
82 | return true; |
83 | } |
84 | EXPORT_SYMBOL(dim_calc_stats); |
85 | |