GNU Linux-libre 5.19-rc6-gnu
[releases.git] / lib / dim / dim.c
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 void 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(end->time, 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;
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 }
83 EXPORT_SYMBOL(dim_calc_stats);