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cb3c7fd4 GR |
1 | /* |
2 | * Copyright (c) 2016, Mellanox Technologies. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
33 | #include "en.h" | |
34 | ||
35 | /* Adaptive moderation profiles */ | |
36 | #define MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE 256 | |
37 | #define MLX5E_RX_AM_DEF_PROFILE_CQE 1 | |
38 | #define MLX5E_RX_AM_DEF_PROFILE_EQE 1 | |
39 | #define MLX5E_PARAMS_AM_NUM_PROFILES 5 | |
40 | ||
41 | /* All profiles sizes must be MLX5E_PARAMS_AM_NUM_PROFILES */ | |
42 | #define MLX5_AM_EQE_PROFILES { \ | |
43 | {1, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ | |
44 | {8, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ | |
45 | {64, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ | |
46 | {128, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ | |
47 | {256, MLX5E_AM_DEFAULT_RX_CQ_MODERATION_PKTS_FROM_EQE}, \ | |
48 | } | |
49 | ||
50 | #define MLX5_AM_CQE_PROFILES { \ | |
51 | {2, 256}, \ | |
52 | {8, 128}, \ | |
53 | {16, 64}, \ | |
54 | {32, 64}, \ | |
55 | {64, 64} \ | |
56 | } | |
57 | ||
58 | static const struct mlx5e_cq_moder | |
59 | profile[MLX5_CQ_PERIOD_NUM_MODES][MLX5E_PARAMS_AM_NUM_PROFILES] = { | |
60 | MLX5_AM_EQE_PROFILES, | |
61 | MLX5_AM_CQE_PROFILES, | |
62 | }; | |
63 | ||
64 | static inline struct mlx5e_cq_moder mlx5e_am_get_profile(u8 cq_period_mode, int ix) | |
65 | { | |
66 | return profile[cq_period_mode][ix]; | |
67 | } | |
68 | ||
69 | struct mlx5e_cq_moder mlx5e_am_get_def_profile(u8 rx_cq_period_mode) | |
70 | { | |
71 | int default_profile_ix; | |
72 | ||
73 | if (rx_cq_period_mode == MLX5_CQ_PERIOD_MODE_START_FROM_CQE) | |
74 | default_profile_ix = MLX5E_RX_AM_DEF_PROFILE_CQE; | |
75 | else /* MLX5_CQ_PERIOD_MODE_START_FROM_EQE */ | |
76 | default_profile_ix = MLX5E_RX_AM_DEF_PROFILE_EQE; | |
77 | ||
78 | return profile[rx_cq_period_mode][default_profile_ix]; | |
79 | } | |
80 | ||
81 | /* Adaptive moderation logic */ | |
82 | enum { | |
83 | MLX5E_AM_START_MEASURE, | |
84 | MLX5E_AM_MEASURE_IN_PROGRESS, | |
85 | MLX5E_AM_APPLY_NEW_PROFILE, | |
86 | }; | |
87 | ||
88 | enum { | |
89 | MLX5E_AM_PARKING_ON_TOP, | |
90 | MLX5E_AM_PARKING_TIRED, | |
91 | MLX5E_AM_GOING_RIGHT, | |
92 | MLX5E_AM_GOING_LEFT, | |
93 | }; | |
94 | ||
95 | enum { | |
96 | MLX5E_AM_STATS_WORSE, | |
97 | MLX5E_AM_STATS_SAME, | |
98 | MLX5E_AM_STATS_BETTER, | |
99 | }; | |
100 | ||
101 | enum { | |
102 | MLX5E_AM_STEPPED, | |
103 | MLX5E_AM_TOO_TIRED, | |
104 | MLX5E_AM_ON_EDGE, | |
105 | }; | |
106 | ||
107 | static bool mlx5e_am_on_top(struct mlx5e_rx_am *am) | |
108 | { | |
109 | switch (am->tune_state) { | |
110 | case MLX5E_AM_PARKING_ON_TOP: | |
111 | case MLX5E_AM_PARKING_TIRED: | |
cb3c7fd4 GR |
112 | return true; |
113 | case MLX5E_AM_GOING_RIGHT: | |
114 | return (am->steps_left > 1) && (am->steps_right == 1); | |
115 | default: /* MLX5E_AM_GOING_LEFT */ | |
116 | return (am->steps_right > 1) && (am->steps_left == 1); | |
117 | } | |
118 | } | |
119 | ||
120 | static void mlx5e_am_turn(struct mlx5e_rx_am *am) | |
121 | { | |
122 | switch (am->tune_state) { | |
123 | case MLX5E_AM_PARKING_ON_TOP: | |
124 | case MLX5E_AM_PARKING_TIRED: | |
cb3c7fd4 GR |
125 | break; |
126 | case MLX5E_AM_GOING_RIGHT: | |
127 | am->tune_state = MLX5E_AM_GOING_LEFT; | |
128 | am->steps_left = 0; | |
129 | break; | |
130 | case MLX5E_AM_GOING_LEFT: | |
131 | am->tune_state = MLX5E_AM_GOING_RIGHT; | |
132 | am->steps_right = 0; | |
133 | break; | |
134 | } | |
135 | } | |
136 | ||
137 | static int mlx5e_am_step(struct mlx5e_rx_am *am) | |
138 | { | |
139 | if (am->tired == (MLX5E_PARAMS_AM_NUM_PROFILES * 2)) | |
140 | return MLX5E_AM_TOO_TIRED; | |
141 | ||
142 | switch (am->tune_state) { | |
143 | case MLX5E_AM_PARKING_ON_TOP: | |
144 | case MLX5E_AM_PARKING_TIRED: | |
cb3c7fd4 GR |
145 | break; |
146 | case MLX5E_AM_GOING_RIGHT: | |
147 | if (am->profile_ix == (MLX5E_PARAMS_AM_NUM_PROFILES - 1)) | |
148 | return MLX5E_AM_ON_EDGE; | |
149 | am->profile_ix++; | |
150 | am->steps_right++; | |
151 | break; | |
152 | case MLX5E_AM_GOING_LEFT: | |
153 | if (am->profile_ix == 0) | |
154 | return MLX5E_AM_ON_EDGE; | |
155 | am->profile_ix--; | |
156 | am->steps_left++; | |
157 | break; | |
158 | } | |
159 | ||
160 | am->tired++; | |
161 | return MLX5E_AM_STEPPED; | |
162 | } | |
163 | ||
164 | static void mlx5e_am_park_on_top(struct mlx5e_rx_am *am) | |
165 | { | |
166 | am->steps_right = 0; | |
167 | am->steps_left = 0; | |
168 | am->tired = 0; | |
169 | am->tune_state = MLX5E_AM_PARKING_ON_TOP; | |
170 | } | |
171 | ||
172 | static void mlx5e_am_park_tired(struct mlx5e_rx_am *am) | |
173 | { | |
174 | am->steps_right = 0; | |
175 | am->steps_left = 0; | |
176 | am->tune_state = MLX5E_AM_PARKING_TIRED; | |
177 | } | |
178 | ||
179 | static void mlx5e_am_exit_parking(struct mlx5e_rx_am *am) | |
180 | { | |
181 | am->tune_state = am->profile_ix ? MLX5E_AM_GOING_LEFT : | |
182 | MLX5E_AM_GOING_RIGHT; | |
183 | mlx5e_am_step(am); | |
184 | } | |
185 | ||
186 | static int mlx5e_am_stats_compare(struct mlx5e_rx_am_stats *curr, | |
187 | struct mlx5e_rx_am_stats *prev) | |
188 | { | |
189 | int diff; | |
190 | ||
191 | if (!prev->ppms) | |
192 | return curr->ppms ? MLX5E_AM_STATS_BETTER : | |
193 | MLX5E_AM_STATS_SAME; | |
194 | ||
195 | diff = curr->ppms - prev->ppms; | |
196 | if (((100 * abs(diff)) / prev->ppms) > 10) /* more than 10% diff */ | |
197 | return (diff > 0) ? MLX5E_AM_STATS_BETTER : | |
198 | MLX5E_AM_STATS_WORSE; | |
199 | ||
200 | if (!prev->epms) | |
201 | return curr->epms ? MLX5E_AM_STATS_WORSE : | |
202 | MLX5E_AM_STATS_SAME; | |
203 | ||
204 | diff = curr->epms - prev->epms; | |
205 | if (((100 * abs(diff)) / prev->epms) > 10) /* more than 10% diff */ | |
206 | return (diff < 0) ? MLX5E_AM_STATS_BETTER : | |
207 | MLX5E_AM_STATS_WORSE; | |
208 | ||
209 | return MLX5E_AM_STATS_SAME; | |
210 | } | |
211 | ||
212 | static bool mlx5e_am_decision(struct mlx5e_rx_am_stats *curr_stats, | |
213 | struct mlx5e_rx_am *am) | |
214 | { | |
215 | int prev_state = am->tune_state; | |
216 | int prev_ix = am->profile_ix; | |
217 | int stats_res; | |
218 | int step_res; | |
219 | ||
220 | switch (am->tune_state) { | |
221 | case MLX5E_AM_PARKING_ON_TOP: | |
222 | stats_res = mlx5e_am_stats_compare(curr_stats, &am->prev_stats); | |
223 | if (stats_res != MLX5E_AM_STATS_SAME) | |
224 | mlx5e_am_exit_parking(am); | |
225 | break; | |
226 | ||
227 | case MLX5E_AM_PARKING_TIRED: | |
228 | am->tired--; | |
229 | if (!am->tired) | |
230 | mlx5e_am_exit_parking(am); | |
231 | break; | |
232 | ||
233 | case MLX5E_AM_GOING_RIGHT: | |
234 | case MLX5E_AM_GOING_LEFT: | |
235 | stats_res = mlx5e_am_stats_compare(curr_stats, &am->prev_stats); | |
236 | if (stats_res != MLX5E_AM_STATS_BETTER) | |
237 | mlx5e_am_turn(am); | |
238 | ||
239 | if (mlx5e_am_on_top(am)) { | |
240 | mlx5e_am_park_on_top(am); | |
241 | break; | |
242 | } | |
243 | ||
244 | step_res = mlx5e_am_step(am); | |
245 | switch (step_res) { | |
246 | case MLX5E_AM_ON_EDGE: | |
247 | mlx5e_am_park_on_top(am); | |
248 | break; | |
249 | case MLX5E_AM_TOO_TIRED: | |
250 | mlx5e_am_park_tired(am); | |
251 | break; | |
252 | } | |
253 | ||
254 | break; | |
255 | } | |
256 | ||
257 | if ((prev_state != MLX5E_AM_PARKING_ON_TOP) || | |
258 | (am->tune_state != MLX5E_AM_PARKING_ON_TOP)) | |
259 | am->prev_stats = *curr_stats; | |
260 | ||
261 | return am->profile_ix != prev_ix; | |
262 | } | |
263 | ||
264 | static void mlx5e_am_sample(struct mlx5e_rq *rq, | |
265 | struct mlx5e_rx_am_sample *s) | |
266 | { | |
267 | s->time = ktime_get(); | |
268 | s->pkt_ctr = rq->stats.packets; | |
269 | s->event_ctr = rq->cq.event_ctr; | |
270 | } | |
271 | ||
272 | #define MLX5E_AM_NEVENTS 64 | |
273 | ||
274 | static void mlx5e_am_calc_stats(struct mlx5e_rx_am_sample *start, | |
275 | struct mlx5e_rx_am_sample *end, | |
276 | struct mlx5e_rx_am_stats *curr_stats) | |
277 | { | |
278 | /* u32 holds up to 71 minutes, should be enough */ | |
279 | u32 delta_us = ktime_us_delta(end->time, start->time); | |
280 | unsigned int npkts = end->pkt_ctr - start->pkt_ctr; | |
281 | ||
0bbcc0a8 | 282 | if (!delta_us) |
cb3c7fd4 | 283 | return; |
cb3c7fd4 GR |
284 | |
285 | curr_stats->ppms = (npkts * USEC_PER_MSEC) / delta_us; | |
286 | curr_stats->epms = (MLX5E_AM_NEVENTS * USEC_PER_MSEC) / delta_us; | |
287 | } | |
288 | ||
289 | void mlx5e_rx_am_work(struct work_struct *work) | |
290 | { | |
291 | struct mlx5e_rx_am *am = container_of(work, struct mlx5e_rx_am, | |
292 | work); | |
293 | struct mlx5e_rq *rq = container_of(am, struct mlx5e_rq, am); | |
294 | struct mlx5e_cq_moder cur_profile = profile[am->mode][am->profile_ix]; | |
295 | ||
296 | mlx5_core_modify_cq_moderation(rq->priv->mdev, &rq->cq.mcq, | |
297 | cur_profile.usec, cur_profile.pkts); | |
298 | ||
299 | am->state = MLX5E_AM_START_MEASURE; | |
300 | } | |
301 | ||
302 | void mlx5e_rx_am(struct mlx5e_rq *rq) | |
303 | { | |
304 | struct mlx5e_rx_am *am = &rq->am; | |
305 | struct mlx5e_rx_am_sample end_sample; | |
306 | struct mlx5e_rx_am_stats curr_stats; | |
307 | u16 nevents; | |
308 | ||
309 | switch (am->state) { | |
310 | case MLX5E_AM_MEASURE_IN_PROGRESS: | |
311 | nevents = rq->cq.event_ctr - am->start_sample.event_ctr; | |
312 | if (nevents < MLX5E_AM_NEVENTS) | |
313 | break; | |
314 | mlx5e_am_sample(rq, &end_sample); | |
315 | mlx5e_am_calc_stats(&am->start_sample, &end_sample, | |
316 | &curr_stats); | |
317 | if (mlx5e_am_decision(&curr_stats, am)) { | |
318 | am->state = MLX5E_AM_APPLY_NEW_PROFILE; | |
319 | schedule_work(&am->work); | |
320 | break; | |
321 | } | |
322 | /* fall through */ | |
323 | case MLX5E_AM_START_MEASURE: | |
324 | mlx5e_am_sample(rq, &am->start_sample); | |
325 | am->state = MLX5E_AM_MEASURE_IN_PROGRESS; | |
326 | break; | |
327 | case MLX5E_AM_APPLY_NEW_PROFILE: | |
328 | break; | |
329 | } | |
330 | } |