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1// SPDX-License-Identifier: GPL-2.0+
2/* Microchip Sparx5 Switch driver
3 *
4 * Copyright (c) 2022 Microchip Technology Inc. and its subsidiaries.
5 */
6
7#include <net/pkt_cls.h>
8
9#include "sparx5_main.h"
10#include "sparx5_qos.h"
11
12/* Calculate new base_time based on cycle_time.
13 *
14 * The hardware requires a base_time that is always in the future.
15 * We define threshold_time as current_time + (2 * cycle_time).
16 * If base_time is below threshold_time this function recalculates it to be in
17 * the interval:
18 * threshold_time <= base_time < (threshold_time + cycle_time)
19 *
20 * A very simple algorithm could be like this:
21 * new_base_time = org_base_time + N * cycle_time
22 * using the lowest N so (new_base_time >= threshold_time
23 */
24void sparx5_new_base_time(struct sparx5 *sparx5, const u32 cycle_time,
25 const ktime_t org_base_time, ktime_t *new_base_time)
26{
27 ktime_t current_time, threshold_time, new_time;
28 struct timespec64 ts;
29 u64 nr_of_cycles_p2;
30 u64 nr_of_cycles;
31 u64 diff_time;
32
33 new_time = org_base_time;
34
35 sparx5_ptp_gettime64(&sparx5->phc[SPARX5_PHC_PORT].info, &ts);
36 current_time = timespec64_to_ktime(ts);
37 threshold_time = current_time + (2 * cycle_time);
38 diff_time = threshold_time - new_time;
39 nr_of_cycles = div_u64(diff_time, cycle_time);
40 nr_of_cycles_p2 = 1; /* Use 2^0 as start value */
41
42 if (new_time >= threshold_time) {
43 *new_base_time = new_time;
44 return;
45 }
46
47 /* Calculate the smallest power of 2 (nr_of_cycles_p2)
48 * that is larger than nr_of_cycles.
49 */
50 while (nr_of_cycles_p2 < nr_of_cycles)
51 nr_of_cycles_p2 <<= 1; /* Next (higher) power of 2 */
52
53 /* Add as big chunks (power of 2 * cycle_time)
54 * as possible for each power of 2
55 */
56 while (nr_of_cycles_p2) {
57 if (new_time < threshold_time) {
58 new_time += cycle_time * nr_of_cycles_p2;
59 while (new_time < threshold_time)
60 new_time += cycle_time * nr_of_cycles_p2;
61 new_time -= cycle_time * nr_of_cycles_p2;
62 }
63 nr_of_cycles_p2 >>= 1; /* Next (lower) power of 2 */
64 }
65 new_time += cycle_time;
66 *new_base_time = new_time;
67}
68
69/* Max rates for leak groups */
70static const u32 spx5_hsch_max_group_rate[SPX5_HSCH_LEAK_GRP_CNT] = {
71 1048568, /* 1.049 Gbps */
72 2621420, /* 2.621 Gbps */
73 10485680, /* 10.486 Gbps */
74 26214200 /* 26.214 Gbps */
75};
76
77u32 sparx5_get_hsch_max_group_rate(int grp)
78{
79 return spx5_hsch_max_group_rate[grp];
80}
81
82static struct sparx5_layer layers[SPX5_HSCH_LAYER_CNT];
83
84static u32 sparx5_lg_get_leak_time(struct sparx5 *sparx5, u32 layer, u32 group)
85{
86 u32 value;
87
88 value = spx5_rd(sparx5, HSCH_HSCH_TIMER_CFG(layer, group));
89 return HSCH_HSCH_TIMER_CFG_LEAK_TIME_GET(value);
90}
91
92static void sparx5_lg_set_leak_time(struct sparx5 *sparx5, u32 layer, u32 group,
93 u32 leak_time)
94{
95 spx5_wr(HSCH_HSCH_TIMER_CFG_LEAK_TIME_SET(leak_time), sparx5,
96 HSCH_HSCH_TIMER_CFG(layer, group));
97}
98
99static u32 sparx5_lg_get_first(struct sparx5 *sparx5, u32 layer, u32 group)
100{
101 u32 value;
102
103 value = spx5_rd(sparx5, HSCH_HSCH_LEAK_CFG(layer, group));
104 return HSCH_HSCH_LEAK_CFG_LEAK_FIRST_GET(value);
105}
106
107static u32 sparx5_lg_get_next(struct sparx5 *sparx5, u32 layer, u32 group,
108 u32 idx)
109
110{
111 u32 value;
112
113 value = spx5_rd(sparx5, HSCH_SE_CONNECT(idx));
114 return HSCH_SE_CONNECT_SE_LEAK_LINK_GET(value);
115}
116
117static u32 sparx5_lg_get_last(struct sparx5 *sparx5, u32 layer, u32 group)
118{
119 u32 itr, next;
120
121 itr = sparx5_lg_get_first(sparx5, layer, group);
122
123 for (;;) {
124 next = sparx5_lg_get_next(sparx5, layer, group, itr);
125 if (itr == next)
126 return itr;
127
128 itr = next;
129 }
130}
131
132static bool sparx5_lg_is_last(struct sparx5 *sparx5, u32 layer, u32 group,
133 u32 idx)
134{
135 return idx == sparx5_lg_get_next(sparx5, layer, group, idx);
136}
137
138static bool sparx5_lg_is_first(struct sparx5 *sparx5, u32 layer, u32 group,
139 u32 idx)
140{
141 return idx == sparx5_lg_get_first(sparx5, layer, group);
142}
143
144static bool sparx5_lg_is_empty(struct sparx5 *sparx5, u32 layer, u32 group)
145{
146 return sparx5_lg_get_leak_time(sparx5, layer, group) == 0;
147}
148
149static bool sparx5_lg_is_singular(struct sparx5 *sparx5, u32 layer, u32 group)
150{
151 if (sparx5_lg_is_empty(sparx5, layer, group))
152 return false;
153
154 return sparx5_lg_get_first(sparx5, layer, group) ==
155 sparx5_lg_get_last(sparx5, layer, group);
156}
157
158static void sparx5_lg_enable(struct sparx5 *sparx5, u32 layer, u32 group,
159 u32 leak_time)
160{
161 sparx5_lg_set_leak_time(sparx5, layer, group, leak_time);
162}
163
164static void sparx5_lg_disable(struct sparx5 *sparx5, u32 layer, u32 group)
165{
166 sparx5_lg_set_leak_time(sparx5, layer, group, 0);
167}
168
169static int sparx5_lg_get_group_by_index(struct sparx5 *sparx5, u32 layer,
170 u32 idx, u32 *group)
171{
172 u32 itr, next;
173 int i;
174
175 for (i = 0; i < SPX5_HSCH_LEAK_GRP_CNT; i++) {
176 if (sparx5_lg_is_empty(sparx5, layer, i))
177 continue;
178
179 itr = sparx5_lg_get_first(sparx5, layer, i);
180
181 for (;;) {
182 next = sparx5_lg_get_next(sparx5, layer, i, itr);
183
184 if (itr == idx) {
185 *group = i;
186 return 0; /* Found it */
187 }
188 if (itr == next)
189 break; /* Was not found */
190
191 itr = next;
192 }
193 }
194
195 return -1;
196}
197
198static int sparx5_lg_get_group_by_rate(u32 layer, u32 rate, u32 *group)
199{
200 struct sparx5_layer *l = &layers[layer];
201 struct sparx5_lg *lg;
202 u32 i;
203
204 for (i = 0; i < SPX5_HSCH_LEAK_GRP_CNT; i++) {
205 lg = &l->leak_groups[i];
206 if (rate <= lg->max_rate) {
207 *group = i;
208 return 0;
209 }
210 }
211
212 return -1;
213}
214
215static int sparx5_lg_get_adjacent(struct sparx5 *sparx5, u32 layer, u32 group,
216 u32 idx, u32 *prev, u32 *next, u32 *first)
217{
218 u32 itr;
219
220 *first = sparx5_lg_get_first(sparx5, layer, group);
221 *prev = *first;
222 *next = *first;
223 itr = *first;
224
225 for (;;) {
226 *next = sparx5_lg_get_next(sparx5, layer, group, itr);
227
228 if (itr == idx)
229 return 0; /* Found it */
230
231 if (itr == *next)
232 return -1; /* Was not found */
233
234 *prev = itr;
235 itr = *next;
236 }
237
238 return -1;
239}
240
241static int sparx5_lg_conf_set(struct sparx5 *sparx5, u32 layer, u32 group,
242 u32 se_first, u32 idx, u32 idx_next, bool empty)
243{
244 u32 leak_time = layers[layer].leak_groups[group].leak_time;
245
246 /* Stop leaking */
247 sparx5_lg_disable(sparx5, layer, group);
248
249 if (empty)
250 return 0;
251
252 /* Select layer */
253 spx5_rmw(HSCH_HSCH_CFG_CFG_HSCH_LAYER_SET(layer),
254 HSCH_HSCH_CFG_CFG_HSCH_LAYER, sparx5, HSCH_HSCH_CFG_CFG);
255
256 /* Link elements */
257 spx5_wr(HSCH_SE_CONNECT_SE_LEAK_LINK_SET(idx_next), sparx5,
258 HSCH_SE_CONNECT(idx));
259
260 /* Set the first element. */
261 spx5_rmw(HSCH_HSCH_LEAK_CFG_LEAK_FIRST_SET(se_first),
262 HSCH_HSCH_LEAK_CFG_LEAK_FIRST, sparx5,
263 HSCH_HSCH_LEAK_CFG(layer, group));
264
265 /* Start leaking */
266 sparx5_lg_enable(sparx5, layer, group, leak_time);
267
268 return 0;
269}
270
271static int sparx5_lg_del(struct sparx5 *sparx5, u32 layer, u32 group, u32 idx)
272{
273 u32 first, next, prev;
274 bool empty = false;
275
276 /* idx *must* be present in the leak group */
277 WARN_ON(sparx5_lg_get_adjacent(sparx5, layer, group, idx, &prev, &next,
278 &first) < 0);
279
280 if (sparx5_lg_is_singular(sparx5, layer, group)) {
281 empty = true;
282 } else if (sparx5_lg_is_last(sparx5, layer, group, idx)) {
283 /* idx is removed, prev is now last */
284 idx = prev;
285 next = prev;
286 } else if (sparx5_lg_is_first(sparx5, layer, group, idx)) {
287 /* idx is removed and points to itself, first is next */
288 first = next;
289 next = idx;
290 } else {
291 /* Next is not touched */
292 idx = prev;
293 }
294
295 return sparx5_lg_conf_set(sparx5, layer, group, first, idx, next,
296 empty);
297}
298
299static int sparx5_lg_add(struct sparx5 *sparx5, u32 layer, u32 new_group,
300 u32 idx)
301{
302 u32 first, next, old_group;
303
304 pr_debug("ADD: layer: %d, new_group: %d, idx: %d", layer, new_group,
305 idx);
306
307 /* Is this SE already shaping ? */
308 if (sparx5_lg_get_group_by_index(sparx5, layer, idx, &old_group) >= 0) {
309 if (old_group != new_group) {
310 /* Delete from old group */
311 sparx5_lg_del(sparx5, layer, old_group, idx);
312 } else {
313 /* Nothing to do here */
314 return 0;
315 }
316 }
317
318 /* We always add to head of the list */
319 first = idx;
320
321 if (sparx5_lg_is_empty(sparx5, layer, new_group))
322 next = idx;
323 else
324 next = sparx5_lg_get_first(sparx5, layer, new_group);
325
326 return sparx5_lg_conf_set(sparx5, layer, new_group, first, idx, next,
327 false);
328}
329
330static int sparx5_shaper_conf_set(struct sparx5_port *port,
331 const struct sparx5_shaper *sh, u32 layer,
332 u32 idx, u32 group)
333{
334 int (*sparx5_lg_action)(struct sparx5 *, u32, u32, u32);
335 struct sparx5 *sparx5 = port->sparx5;
336
337 if (!sh->rate && !sh->burst)
338 sparx5_lg_action = &sparx5_lg_del;
339 else
340 sparx5_lg_action = &sparx5_lg_add;
341
342 /* Select layer */
343 spx5_rmw(HSCH_HSCH_CFG_CFG_HSCH_LAYER_SET(layer),
344 HSCH_HSCH_CFG_CFG_HSCH_LAYER, sparx5, HSCH_HSCH_CFG_CFG);
345
346 /* Set frame mode */
347 spx5_rmw(HSCH_SE_CFG_SE_FRM_MODE_SET(sh->mode), HSCH_SE_CFG_SE_FRM_MODE,
348 sparx5, HSCH_SE_CFG(idx));
349
350 /* Set committed rate and burst */
351 spx5_wr(HSCH_CIR_CFG_CIR_RATE_SET(sh->rate) |
352 HSCH_CIR_CFG_CIR_BURST_SET(sh->burst),
353 sparx5, HSCH_CIR_CFG(idx));
354
355 /* This has to be done after the shaper configuration has been set */
356 sparx5_lg_action(sparx5, layer, group, idx);
357
358 return 0;
359}
360
361static u32 sparx5_weight_to_hw_cost(u32 weight_min, u32 weight)
362{
363 return ((((SPX5_DWRR_COST_MAX << 4) * weight_min / weight) + 8) >> 4) -
364 1;
365}
366
367static int sparx5_dwrr_conf_set(struct sparx5_port *port,
368 struct sparx5_dwrr *dwrr)
369{
370 u32 layer = is_sparx5(port->sparx5) ? 2 : 1;
371 int i;
372
373 spx5_rmw(HSCH_HSCH_CFG_CFG_HSCH_LAYER_SET(layer) |
374 HSCH_HSCH_CFG_CFG_CFG_SE_IDX_SET(port->portno),
375 HSCH_HSCH_CFG_CFG_HSCH_LAYER | HSCH_HSCH_CFG_CFG_CFG_SE_IDX,
376 port->sparx5, HSCH_HSCH_CFG_CFG);
377
378 /* Number of *lower* indexes that are arbitrated dwrr */
379 spx5_rmw(HSCH_SE_CFG_SE_DWRR_CNT_SET(dwrr->count),
380 HSCH_SE_CFG_SE_DWRR_CNT, port->sparx5,
381 HSCH_SE_CFG(port->portno));
382
383 for (i = 0; i < dwrr->count; i++) {
384 spx5_rmw(HSCH_DWRR_ENTRY_DWRR_COST_SET(dwrr->cost[i]),
385 HSCH_DWRR_ENTRY_DWRR_COST, port->sparx5,
386 HSCH_DWRR_ENTRY(i));
387 }
388
389 return 0;
390}
391
392static int sparx5_leak_groups_init(struct sparx5 *sparx5)
393{
394 const struct sparx5_ops *ops = sparx5->data->ops;
395 struct sparx5_layer *layer;
396 u32 sys_clk_per_100ps;
397 struct sparx5_lg *lg;
398 u32 leak_time_us;
399 int i, ii;
400
401 sys_clk_per_100ps = spx5_rd(sparx5, HSCH_SYS_CLK_PER);
402
403 for (i = 0; i < SPX5_HSCH_LAYER_CNT; i++) {
404 layer = &layers[i];
405 for (ii = 0; ii < SPX5_HSCH_LEAK_GRP_CNT; ii++) {
406 lg = &layer->leak_groups[ii];
407 lg->max_rate = ops->get_hsch_max_group_rate(i);
408
409 /* Calculate the leak time in us, to serve a maximum
410 * rate of 'max_rate' for this group
411 */
412 leak_time_us = (SPX5_SE_RATE_MAX * 1000) / lg->max_rate;
413
414 /* Hardware wants leak time in ns */
415 lg->leak_time = 1000 * leak_time_us;
416
417 /* Calculate resolution */
418 lg->resolution = 1000 / leak_time_us;
419
420 /* Maximum number of shapers that can be served by
421 * this leak group
422 */
423 lg->max_ses = (1000 * leak_time_us) / sys_clk_per_100ps;
424
425 /* Example:
426 * Wanted bandwidth is 100Mbit:
427 *
428 * 100 mbps can be served by leak group zero.
429 *
430 * leak_time is 125000 ns.
431 * resolution is: 8
432 *
433 * cir = 100000 / 8 = 12500
434 * leaks_pr_sec = 125000 / 10^9 = 8000
435 * bw = 12500 * 8000 = 10^8 (100 Mbit)
436 */
437
438 /* Disable by default - this also indicates an empty
439 * leak group
440 */
441 sparx5_lg_disable(sparx5, i, ii);
442 }
443 }
444
445 return 0;
446}
447
448int sparx5_qos_init(struct sparx5 *sparx5)
449{
450 int ret;
451
452 ret = sparx5_leak_groups_init(sparx5);
453 if (ret < 0)
454 return ret;
455
456 ret = sparx5_dcb_init(sparx5);
457 if (ret < 0)
458 return ret;
459
460 sparx5_psfp_init(sparx5);
461
462 return 0;
463}
464
465int sparx5_tc_mqprio_add(struct net_device *ndev, u8 num_tc)
466{
467 int i;
468
469 if (num_tc != SPX5_PRIOS) {
470 netdev_err(ndev, "Only %d traffic classes supported\n",
471 SPX5_PRIOS);
472 return -EINVAL;
473 }
474
475 netdev_set_num_tc(ndev, num_tc);
476
477 for (i = 0; i < num_tc; i++)
478 netdev_set_tc_queue(ndev, i, 1, i);
479
480 netdev_dbg(ndev, "dev->num_tc %u dev->real_num_tx_queues %u\n",
481 ndev->num_tc, ndev->real_num_tx_queues);
482
483 return 0;
484}
485
486int sparx5_tc_mqprio_del(struct net_device *ndev)
487{
488 netdev_reset_tc(ndev);
489
490 netdev_dbg(ndev, "dev->num_tc %u dev->real_num_tx_queues %u\n",
491 ndev->num_tc, ndev->real_num_tx_queues);
492
493 return 0;
494}
495
496int sparx5_tc_tbf_add(struct sparx5_port *port,
497 struct tc_tbf_qopt_offload_replace_params *params,
498 u32 layer, u32 idx)
499{
500 struct sparx5_shaper sh = {
501 .mode = SPX5_SE_MODE_DATARATE,
502 .rate = div_u64(params->rate.rate_bytes_ps, 1000) * 8,
503 .burst = params->max_size,
504 };
505 struct sparx5_lg *lg;
506 u32 group;
507
508 /* Find suitable group for this se */
509 if (sparx5_lg_get_group_by_rate(layer, sh.rate, &group) < 0) {
510 pr_debug("Could not find leak group for se with rate: %d",
511 sh.rate);
512 return -EINVAL;
513 }
514
515 lg = &layers[layer].leak_groups[group];
516
517 pr_debug("Found matching group (speed: %d)\n", lg->max_rate);
518
519 if (sh.rate < SPX5_SE_RATE_MIN || sh.burst < SPX5_SE_BURST_MIN)
520 return -EINVAL;
521
522 /* Calculate committed rate and burst */
523 sh.rate = DIV_ROUND_UP(sh.rate, lg->resolution);
524 sh.burst = DIV_ROUND_UP(sh.burst, SPX5_SE_BURST_UNIT);
525
526 if (sh.rate > SPX5_SE_RATE_MAX || sh.burst > SPX5_SE_BURST_MAX)
527 return -EINVAL;
528
529 return sparx5_shaper_conf_set(port, &sh, layer, idx, group);
530}
531
532int sparx5_tc_tbf_del(struct sparx5_port *port, u32 layer, u32 idx)
533{
534 struct sparx5_shaper sh = {0};
535 u32 group;
536
537 sparx5_lg_get_group_by_index(port->sparx5, layer, idx, &group);
538
539 return sparx5_shaper_conf_set(port, &sh, layer, idx, group);
540}
541
542int sparx5_tc_ets_add(struct sparx5_port *port,
543 struct tc_ets_qopt_offload_replace_params *params)
544{
545 struct sparx5_dwrr dwrr = {0};
546 /* Minimum weight for each iteration */
547 unsigned int w_min = 100;
548 int i;
549
550 /* Find minimum weight for all dwrr bands */
551 for (i = 0; i < SPX5_PRIOS; i++) {
552 if (params->quanta[i] == 0)
553 continue;
554 w_min = min(w_min, params->weights[i]);
555 }
556
557 for (i = 0; i < SPX5_PRIOS; i++) {
558 /* Strict band; skip */
559 if (params->quanta[i] == 0)
560 continue;
561
562 dwrr.count++;
563
564 /* On the sparx5, bands with higher indexes are preferred and
565 * arbitrated strict. Strict bands are put in the lower indexes,
566 * by tc, so we reverse the bands here.
567 *
568 * Also convert the weight to something the hardware
569 * understands.
570 */
571 dwrr.cost[SPX5_PRIOS - i - 1] =
572 sparx5_weight_to_hw_cost(w_min, params->weights[i]);
573 }
574
575 return sparx5_dwrr_conf_set(port, &dwrr);
576}
577
578int sparx5_tc_ets_del(struct sparx5_port *port)
579{
580 struct sparx5_dwrr dwrr = {0};
581
582 return sparx5_dwrr_conf_set(port, &dwrr);
583}