1 // SPDX-License-Identifier: GPL-2.0 OR Linux-O 1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /* 2 /*
3 * Copyright (c) 2019, Mellanox Technologies i 3 * Copyright (c) 2019, Mellanox Technologies inc. All rights reserved.
4 */ 4 */
5 5
6 #include <linux/dim.h> 6 #include <linux/dim.h>
7 7
8 bool dim_on_top(struct dim *dim) 8 bool dim_on_top(struct dim *dim)
9 { 9 {
10 switch (dim->tune_state) { 10 switch (dim->tune_state) {
11 case DIM_PARKING_ON_TOP: 11 case DIM_PARKING_ON_TOP:
12 case DIM_PARKING_TIRED: 12 case DIM_PARKING_TIRED:
13 return true; 13 return true;
14 case DIM_GOING_RIGHT: 14 case DIM_GOING_RIGHT:
15 return (dim->steps_left > 1) & 15 return (dim->steps_left > 1) && (dim->steps_right == 1);
16 default: /* DIM_GOING_LEFT */ 16 default: /* DIM_GOING_LEFT */
17 return (dim->steps_right > 1) 17 return (dim->steps_right > 1) && (dim->steps_left == 1);
18 } 18 }
19 } 19 }
20 EXPORT_SYMBOL(dim_on_top); 20 EXPORT_SYMBOL(dim_on_top);
21 21
22 void dim_turn(struct dim *dim) 22 void dim_turn(struct dim *dim)
23 { 23 {
24 switch (dim->tune_state) { 24 switch (dim->tune_state) {
25 case DIM_PARKING_ON_TOP: 25 case DIM_PARKING_ON_TOP:
26 case DIM_PARKING_TIRED: 26 case DIM_PARKING_TIRED:
27 break; 27 break;
28 case DIM_GOING_RIGHT: 28 case DIM_GOING_RIGHT:
29 dim->tune_state = DIM_GOING_LE 29 dim->tune_state = DIM_GOING_LEFT;
30 dim->steps_left = 0; 30 dim->steps_left = 0;
31 break; 31 break;
32 case DIM_GOING_LEFT: 32 case DIM_GOING_LEFT:
33 dim->tune_state = DIM_GOING_RI 33 dim->tune_state = DIM_GOING_RIGHT;
34 dim->steps_right = 0; 34 dim->steps_right = 0;
35 break; 35 break;
36 } 36 }
37 } 37 }
38 EXPORT_SYMBOL(dim_turn); 38 EXPORT_SYMBOL(dim_turn);
39 39
40 void dim_park_on_top(struct dim *dim) 40 void dim_park_on_top(struct dim *dim)
41 { 41 {
42 dim->steps_right = 0; 42 dim->steps_right = 0;
43 dim->steps_left = 0; 43 dim->steps_left = 0;
44 dim->tired = 0; 44 dim->tired = 0;
45 dim->tune_state = DIM_PARKING_ON_TOP 45 dim->tune_state = DIM_PARKING_ON_TOP;
46 } 46 }
47 EXPORT_SYMBOL(dim_park_on_top); 47 EXPORT_SYMBOL(dim_park_on_top);
48 48
49 void dim_park_tired(struct dim *dim) 49 void dim_park_tired(struct dim *dim)
50 { 50 {
51 dim->steps_right = 0; 51 dim->steps_right = 0;
52 dim->steps_left = 0; 52 dim->steps_left = 0;
53 dim->tune_state = DIM_PARKING_TIRED; 53 dim->tune_state = DIM_PARKING_TIRED;
54 } 54 }
55 EXPORT_SYMBOL(dim_park_tired); 55 EXPORT_SYMBOL(dim_park_tired);
56 56
57 bool dim_calc_stats(struct dim_sample *start, 57 bool dim_calc_stats(struct dim_sample *start, struct dim_sample *end,
58 struct dim_stats *curr_sta 58 struct dim_stats *curr_stats)
59 { 59 {
60 /* u32 holds up to 71 minutes, should 60 /* u32 holds up to 71 minutes, should be enough */
61 u32 delta_us = ktime_us_delta(end->tim 61 u32 delta_us = ktime_us_delta(end->time, start->time);
62 u32 npkts = BIT_GAP(BITS_PER_TYPE(u32) 62 u32 npkts = BIT_GAP(BITS_PER_TYPE(u32), end->pkt_ctr, start->pkt_ctr);
63 u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32 63 u32 nbytes = BIT_GAP(BITS_PER_TYPE(u32), end->byte_ctr,
64 start->byte_ctr); 64 start->byte_ctr);
65 u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32 65 u32 ncomps = BIT_GAP(BITS_PER_TYPE(u32), end->comp_ctr,
66 start->comp_ctr); 66 start->comp_ctr);
67 67
68 if (!delta_us) 68 if (!delta_us)
69 return false; 69 return false;
70 70
71 curr_stats->ppms = DIV_ROUND_UP(npkts 71 curr_stats->ppms = DIV_ROUND_UP(npkts * USEC_PER_MSEC, delta_us);
72 curr_stats->bpms = DIV_ROUND_UP(nbytes 72 curr_stats->bpms = DIV_ROUND_UP(nbytes * USEC_PER_MSEC, delta_us);
73 curr_stats->epms = DIV_ROUND_UP(DIM_NE 73 curr_stats->epms = DIV_ROUND_UP(DIM_NEVENTS * USEC_PER_MSEC,
74 delta_ 74 delta_us);
75 curr_stats->cpms = DIV_ROUND_UP(ncomps 75 curr_stats->cpms = DIV_ROUND_UP(ncomps * USEC_PER_MSEC, delta_us);
76 if (curr_stats->epms != 0) 76 if (curr_stats->epms != 0)
77 curr_stats->cpe_ratio = DIV_RO 77 curr_stats->cpe_ratio = DIV_ROUND_DOWN_ULL(
78 curr_stats->cpms * 100 78 curr_stats->cpms * 100, curr_stats->epms);
79 else 79 else
80 curr_stats->cpe_ratio = 0; 80 curr_stats->cpe_ratio = 0;
81 81
82 return true; 82 return true;
83 } 83 }
84 EXPORT_SYMBOL(dim_calc_stats); 84 EXPORT_SYMBOL(dim_calc_stats);
85 85
86 MODULE_DESCRIPTION("Dynamic Interrupt Moderati 86 MODULE_DESCRIPTION("Dynamic Interrupt Moderation (DIM) library");
87 MODULE_LICENSE("Dual BSD/GPL"); 87 MODULE_LICENSE("Dual BSD/GPL");
88 88
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