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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2019, Intel Corporation. */
3
4#include "ice_dcb_lib.h"
5#include "ice_dcb_nl.h"
6#include "devlink/devlink.h"
7
8/**
9 * ice_dcb_get_ena_tc - return bitmap of enabled TCs
10 * @dcbcfg: DCB config to evaluate for enabled TCs
11 */
12static u8 ice_dcb_get_ena_tc(struct ice_dcbx_cfg *dcbcfg)
13{
14 u8 i, num_tc, ena_tc = 1;
15
16 num_tc = ice_dcb_get_num_tc(dcbcfg);
17
18 for (i = 0; i < num_tc; i++)
19 ena_tc |= BIT(i);
20
21 return ena_tc;
22}
23
24/**
25 * ice_is_pfc_causing_hung_q
26 * @pf: pointer to PF structure
27 * @txqueue: Tx queue which is supposedly hung queue
28 *
29 * find if PFC is causing the hung queue, if yes return true else false
30 */
31bool ice_is_pfc_causing_hung_q(struct ice_pf *pf, unsigned int txqueue)
32{
33 u8 num_tcs = 0, i, tc, up_mapped_tc, up_in_tc = 0;
34 u64 ref_prio_xoff[ICE_MAX_UP];
35 struct ice_vsi *vsi;
36 u32 up2tc;
37
38 vsi = ice_get_main_vsi(pf);
39 if (!vsi)
40 return false;
41
42 ice_for_each_traffic_class(i)
43 if (vsi->tc_cfg.ena_tc & BIT(i))
44 num_tcs++;
45
46 /* first find out the TC to which the hung queue belongs to */
47 for (tc = 0; tc < num_tcs - 1; tc++)
48 if (ice_find_q_in_range(vsi->tc_cfg.tc_info[tc].qoffset,
49 vsi->tc_cfg.tc_info[tc + 1].qoffset,
50 txqueue))
51 break;
52
53 /* Build a bit map of all UPs associated to the suspect hung queue TC,
54 * so that we check for its counter increment.
55 */
56 up2tc = rd32(&pf->hw, PRTDCB_TUP2TC);
57 for (i = 0; i < ICE_MAX_UP; i++) {
58 up_mapped_tc = (up2tc >> (i * 3)) & 0x7;
59 if (up_mapped_tc == tc)
60 up_in_tc |= BIT(i);
61 }
62
63 /* Now that we figured out that hung queue is PFC enabled, still the
64 * Tx timeout can be legitimate. So to make sure Tx timeout is
65 * absolutely caused by PFC storm, check if the counters are
66 * incrementing.
67 */
68 for (i = 0; i < ICE_MAX_UP; i++)
69 if (up_in_tc & BIT(i))
70 ref_prio_xoff[i] = pf->stats.priority_xoff_rx[i];
71
72 ice_update_dcb_stats(pf);
73
74 for (i = 0; i < ICE_MAX_UP; i++)
75 if (up_in_tc & BIT(i))
76 if (pf->stats.priority_xoff_rx[i] > ref_prio_xoff[i])
77 return true;
78
79 return false;
80}
81
82/**
83 * ice_dcb_get_mode - gets the DCB mode
84 * @port_info: pointer to port info structure
85 * @host: if set it's HOST if not it's MANAGED
86 */
87static u8 ice_dcb_get_mode(struct ice_port_info *port_info, bool host)
88{
89 u8 mode;
90
91 if (host)
92 mode = DCB_CAP_DCBX_HOST;
93 else
94 mode = DCB_CAP_DCBX_LLD_MANAGED;
95
96 if (port_info->qos_cfg.local_dcbx_cfg.dcbx_mode & ICE_DCBX_MODE_CEE)
97 return mode | DCB_CAP_DCBX_VER_CEE;
98 else
99 return mode | DCB_CAP_DCBX_VER_IEEE;
100}
101
102/**
103 * ice_dcb_get_num_tc - Get the number of TCs from DCBX config
104 * @dcbcfg: config to retrieve number of TCs from
105 */
106u8 ice_dcb_get_num_tc(struct ice_dcbx_cfg *dcbcfg)
107{
108 bool tc_unused = false;
109 u8 num_tc = 0;
110 u8 ret = 0;
111 int i;
112
113 /* Scan the ETS Config Priority Table to find traffic classes
114 * enabled and create a bitmask of enabled TCs
115 */
116 for (i = 0; i < CEE_DCBX_MAX_PRIO; i++)
117 num_tc |= BIT(dcbcfg->etscfg.prio_table[i]);
118
119 /* Scan bitmask for contiguous TCs starting with TC0 */
120 for (i = 0; i < IEEE_8021QAZ_MAX_TCS; i++) {
121 if (num_tc & BIT(i)) {
122 if (!tc_unused) {
123 ret++;
124 } else {
125 pr_err("Non-contiguous TCs - Disabling DCB\n");
126 return 1;
127 }
128 } else {
129 tc_unused = true;
130 }
131 }
132
133 /* There is always at least 1 TC */
134 if (!ret)
135 ret = 1;
136
137 return ret;
138}
139
140/**
141 * ice_get_first_droptc - returns number of first droptc
142 * @vsi: used to find the first droptc
143 *
144 * This function returns the value of first_droptc.
145 * When DCB is enabled, first droptc information is derived from enabled_tc
146 * and PFC enabled bits. otherwise this function returns 0 as there is one
147 * TC without DCB (tc0)
148 */
149static u8 ice_get_first_droptc(struct ice_vsi *vsi)
150{
151 struct ice_dcbx_cfg *cfg = &vsi->port_info->qos_cfg.local_dcbx_cfg;
152 struct device *dev = ice_pf_to_dev(vsi->back);
153 u8 num_tc, ena_tc_map, pfc_ena_map;
154 u8 i;
155
156 num_tc = ice_dcb_get_num_tc(cfg);
157
158 /* get bitmap of enabled TCs */
159 ena_tc_map = ice_dcb_get_ena_tc(cfg);
160
161 /* get bitmap of PFC enabled TCs */
162 pfc_ena_map = cfg->pfc.pfcena;
163
164 /* get first TC that is not PFC enabled */
165 for (i = 0; i < num_tc; i++) {
166 if ((ena_tc_map & BIT(i)) && (!(pfc_ena_map & BIT(i)))) {
167 dev_dbg(dev, "first drop tc = %d\n", i);
168 return i;
169 }
170 }
171
172 dev_dbg(dev, "first drop tc = 0\n");
173 return 0;
174}
175
176/**
177 * ice_vsi_set_dcb_tc_cfg - Set VSI's TC based on DCB configuration
178 * @vsi: pointer to the VSI instance
179 */
180void ice_vsi_set_dcb_tc_cfg(struct ice_vsi *vsi)
181{
182 struct ice_dcbx_cfg *cfg = &vsi->port_info->qos_cfg.local_dcbx_cfg;
183
184 switch (vsi->type) {
185 case ICE_VSI_PF:
186 vsi->tc_cfg.ena_tc = ice_dcb_get_ena_tc(cfg);
187 vsi->tc_cfg.numtc = ice_dcb_get_num_tc(cfg);
188 break;
189 case ICE_VSI_CHNL:
190 case ICE_VSI_SF:
191 vsi->tc_cfg.ena_tc = BIT(ice_get_first_droptc(vsi));
192 vsi->tc_cfg.numtc = 1;
193 break;
194 case ICE_VSI_CTRL:
195 case ICE_VSI_LB:
196 default:
197 vsi->tc_cfg.ena_tc = ICE_DFLT_TRAFFIC_CLASS;
198 vsi->tc_cfg.numtc = 1;
199 }
200}
201
202/**
203 * ice_dcb_get_tc - Get the TC associated with the queue
204 * @vsi: ptr to the VSI
205 * @queue_index: queue number associated with VSI
206 */
207u8 ice_dcb_get_tc(struct ice_vsi *vsi, int queue_index)
208{
209 return vsi->tx_rings[queue_index]->dcb_tc;
210}
211
212/**
213 * ice_vsi_cfg_dcb_rings - Update rings to reflect DCB TC
214 * @vsi: VSI owner of rings being updated
215 */
216void ice_vsi_cfg_dcb_rings(struct ice_vsi *vsi)
217{
218 struct ice_tx_ring *tx_ring;
219 struct ice_rx_ring *rx_ring;
220 u16 qoffset, qcount;
221 int i, n;
222
223 if (!test_bit(ICE_FLAG_DCB_ENA, vsi->back->flags)) {
224 /* Reset the TC information */
225 ice_for_each_txq(vsi, i) {
226 tx_ring = vsi->tx_rings[i];
227 tx_ring->dcb_tc = 0;
228 }
229 ice_for_each_rxq(vsi, i) {
230 rx_ring = vsi->rx_rings[i];
231 rx_ring->dcb_tc = 0;
232 }
233 return;
234 }
235
236 ice_for_each_traffic_class(n) {
237 if (!(vsi->tc_cfg.ena_tc & BIT(n)))
238 break;
239
240 qoffset = vsi->tc_cfg.tc_info[n].qoffset;
241 qcount = vsi->tc_cfg.tc_info[n].qcount_tx;
242 for (i = qoffset; i < (qoffset + qcount); i++)
243 vsi->tx_rings[i]->dcb_tc = n;
244
245 qcount = vsi->tc_cfg.tc_info[n].qcount_rx;
246 for (i = qoffset; i < (qoffset + qcount); i++)
247 vsi->rx_rings[i]->dcb_tc = n;
248 }
249 /* applicable only if "all_enatc" is set, which will be set from
250 * setup_tc method as part of configuring channels
251 */
252 if (vsi->all_enatc) {
253 u8 first_droptc = ice_get_first_droptc(vsi);
254
255 /* When DCB is configured, TC for ADQ queues (which are really
256 * PF queues) should be the first drop TC of the main VSI
257 */
258 ice_for_each_chnl_tc(n) {
259 if (!(vsi->all_enatc & BIT(n)))
260 break;
261
262 qoffset = vsi->mqprio_qopt.qopt.offset[n];
263 qcount = vsi->mqprio_qopt.qopt.count[n];
264 for (i = qoffset; i < (qoffset + qcount); i++) {
265 vsi->tx_rings[i]->dcb_tc = first_droptc;
266 vsi->rx_rings[i]->dcb_tc = first_droptc;
267 }
268 }
269 }
270}
271
272/**
273 * ice_dcb_ena_dis_vsi - disable certain VSIs for DCB config/reconfig
274 * @pf: pointer to the PF instance
275 * @ena: true to enable VSIs, false to disable
276 * @locked: true if caller holds RTNL lock, false otherwise
277 *
278 * Before a new DCB configuration can be applied, VSIs of type PF, SWITCHDEV
279 * and CHNL need to be brought down. Following completion of DCB configuration
280 * the VSIs that were downed need to be brought up again. This helper function
281 * does both.
282 */
283static void ice_dcb_ena_dis_vsi(struct ice_pf *pf, bool ena, bool locked)
284{
285 int i;
286
287 ice_for_each_vsi(pf, i) {
288 struct ice_vsi *vsi = pf->vsi[i];
289
290 if (!vsi)
291 continue;
292
293 switch (vsi->type) {
294 case ICE_VSI_CHNL:
295 case ICE_VSI_PF:
296 if (ena)
297 ice_ena_vsi(vsi, locked);
298 else
299 ice_dis_vsi(vsi, locked);
300 break;
301 default:
302 continue;
303 }
304 }
305}
306
307/**
308 * ice_dcb_bwchk - check if ETS bandwidth input parameters are correct
309 * @pf: pointer to the PF struct
310 * @dcbcfg: pointer to DCB config structure
311 */
312int ice_dcb_bwchk(struct ice_pf *pf, struct ice_dcbx_cfg *dcbcfg)
313{
314 struct ice_dcb_ets_cfg *etscfg = &dcbcfg->etscfg;
315 u8 num_tc, total_bw = 0;
316 int i;
317
318 /* returns number of contigous TCs and 1 TC for non-contigous TCs,
319 * since at least 1 TC has to be configured
320 */
321 num_tc = ice_dcb_get_num_tc(dcbcfg);
322
323 /* no bandwidth checks required if there's only one TC, so assign
324 * all bandwidth to TC0 and return
325 */
326 if (num_tc == 1) {
327 etscfg->tcbwtable[0] = ICE_TC_MAX_BW;
328 return 0;
329 }
330
331 for (i = 0; i < num_tc; i++)
332 total_bw += etscfg->tcbwtable[i];
333
334 if (!total_bw) {
335 etscfg->tcbwtable[0] = ICE_TC_MAX_BW;
336 } else if (total_bw != ICE_TC_MAX_BW) {
337 dev_err(ice_pf_to_dev(pf), "Invalid config, total bandwidth must equal 100\n");
338 return -EINVAL;
339 }
340
341 return 0;
342}
343
344/**
345 * ice_pf_dcb_cfg - Apply new DCB configuration
346 * @pf: pointer to the PF struct
347 * @new_cfg: DCBX config to apply
348 * @locked: is the RTNL held
349 */
350int ice_pf_dcb_cfg(struct ice_pf *pf, struct ice_dcbx_cfg *new_cfg, bool locked)
351{
352 struct ice_aqc_port_ets_elem buf = { 0 };
353 struct ice_dcbx_cfg *old_cfg, *curr_cfg;
354 struct device *dev = ice_pf_to_dev(pf);
355 int ret = ICE_DCB_NO_HW_CHG;
356 struct iidc_event *event;
357 struct ice_vsi *pf_vsi;
358
359 curr_cfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
360
361 /* FW does not care if change happened */
362 if (!pf->hw.port_info->qos_cfg.is_sw_lldp)
363 ret = ICE_DCB_HW_CHG_RST;
364
365 /* Enable DCB tagging only when more than one TC */
366 if (ice_dcb_get_num_tc(new_cfg) > 1) {
367 dev_dbg(dev, "DCB tagging enabled (num TC > 1)\n");
368 if (pf->hw.port_info->is_custom_tx_enabled) {
369 dev_err(dev, "Custom Tx scheduler feature enabled, can't configure DCB\n");
370 return -EBUSY;
371 }
372 ice_tear_down_devlink_rate_tree(pf);
373
374 set_bit(ICE_FLAG_DCB_ENA, pf->flags);
375 } else {
376 dev_dbg(dev, "DCB tagging disabled (num TC = 1)\n");
377 clear_bit(ICE_FLAG_DCB_ENA, pf->flags);
378 }
379
380 if (!memcmp(new_cfg, curr_cfg, sizeof(*new_cfg))) {
381 dev_dbg(dev, "No change in DCB config required\n");
382 return ret;
383 }
384
385 if (ice_dcb_bwchk(pf, new_cfg))
386 return -EINVAL;
387
388 /* Store old config in case FW config fails */
389 old_cfg = kmemdup(curr_cfg, sizeof(*old_cfg), GFP_KERNEL);
390 if (!old_cfg)
391 return -ENOMEM;
392
393 dev_info(dev, "Commit DCB Configuration to the hardware\n");
394 pf_vsi = ice_get_main_vsi(pf);
395 if (!pf_vsi) {
396 dev_dbg(dev, "PF VSI doesn't exist\n");
397 ret = -EINVAL;
398 goto free_cfg;
399 }
400
401 /* Notify AUX drivers about impending change to TCs */
402 event = kzalloc(sizeof(*event), GFP_KERNEL);
403 if (!event) {
404 ret = -ENOMEM;
405 goto free_cfg;
406 }
407
408 set_bit(IIDC_EVENT_BEFORE_TC_CHANGE, event->type);
409 ice_send_event_to_aux(pf, event);
410 kfree(event);
411
412 /* avoid race conditions by holding the lock while disabling and
413 * re-enabling the VSI
414 */
415 if (!locked)
416 rtnl_lock();
417
418 /* disable VSIs affected by DCB changes */
419 ice_dcb_ena_dis_vsi(pf, false, true);
420
421 memcpy(curr_cfg, new_cfg, sizeof(*curr_cfg));
422 memcpy(&curr_cfg->etsrec, &curr_cfg->etscfg, sizeof(curr_cfg->etsrec));
423 memcpy(&new_cfg->etsrec, &curr_cfg->etscfg, sizeof(curr_cfg->etsrec));
424
425 /* Only send new config to HW if we are in SW LLDP mode. Otherwise,
426 * the new config came from the HW in the first place.
427 */
428 if (pf->hw.port_info->qos_cfg.is_sw_lldp) {
429 ret = ice_set_dcb_cfg(pf->hw.port_info);
430 if (ret) {
431 dev_err(dev, "Set DCB Config failed\n");
432 /* Restore previous settings to local config */
433 memcpy(curr_cfg, old_cfg, sizeof(*curr_cfg));
434 goto out;
435 }
436 }
437
438 ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
439 if (ret) {
440 dev_err(dev, "Query Port ETS failed\n");
441 goto out;
442 }
443
444 ice_pf_dcb_recfg(pf, false);
445
446out:
447 /* enable previously downed VSIs */
448 ice_dcb_ena_dis_vsi(pf, true, true);
449 if (!locked)
450 rtnl_unlock();
451free_cfg:
452 kfree(old_cfg);
453 return ret;
454}
455
456/**
457 * ice_cfg_etsrec_defaults - Set default ETS recommended DCB config
458 * @pi: port information structure
459 */
460static void ice_cfg_etsrec_defaults(struct ice_port_info *pi)
461{
462 struct ice_dcbx_cfg *dcbcfg = &pi->qos_cfg.local_dcbx_cfg;
463 u8 i;
464
465 /* Ensure ETS recommended DCB configuration is not already set */
466 if (dcbcfg->etsrec.maxtcs)
467 return;
468
469 /* In CEE mode, set the default to 1 TC */
470 dcbcfg->etsrec.maxtcs = 1;
471 for (i = 0; i < ICE_MAX_TRAFFIC_CLASS; i++) {
472 dcbcfg->etsrec.tcbwtable[i] = i ? 0 : 100;
473 dcbcfg->etsrec.tsatable[i] = i ? ICE_IEEE_TSA_STRICT :
474 ICE_IEEE_TSA_ETS;
475 }
476}
477
478/**
479 * ice_dcb_need_recfg - Check if DCB needs reconfig
480 * @pf: board private structure
481 * @old_cfg: current DCB config
482 * @new_cfg: new DCB config
483 */
484static bool
485ice_dcb_need_recfg(struct ice_pf *pf, struct ice_dcbx_cfg *old_cfg,
486 struct ice_dcbx_cfg *new_cfg)
487{
488 struct device *dev = ice_pf_to_dev(pf);
489 bool need_reconfig = false;
490
491 /* Check if ETS configuration has changed */
492 if (memcmp(&new_cfg->etscfg, &old_cfg->etscfg,
493 sizeof(new_cfg->etscfg))) {
494 /* If Priority Table has changed reconfig is needed */
495 if (memcmp(&new_cfg->etscfg.prio_table,
496 &old_cfg->etscfg.prio_table,
497 sizeof(new_cfg->etscfg.prio_table))) {
498 need_reconfig = true;
499 dev_dbg(dev, "ETS UP2TC changed.\n");
500 }
501
502 if (memcmp(&new_cfg->etscfg.tcbwtable,
503 &old_cfg->etscfg.tcbwtable,
504 sizeof(new_cfg->etscfg.tcbwtable)))
505 dev_dbg(dev, "ETS TC BW Table changed.\n");
506
507 if (memcmp(&new_cfg->etscfg.tsatable,
508 &old_cfg->etscfg.tsatable,
509 sizeof(new_cfg->etscfg.tsatable)))
510 dev_dbg(dev, "ETS TSA Table changed.\n");
511 }
512
513 /* Check if PFC configuration has changed */
514 if (memcmp(&new_cfg->pfc, &old_cfg->pfc, sizeof(new_cfg->pfc))) {
515 need_reconfig = true;
516 dev_dbg(dev, "PFC config change detected.\n");
517 }
518
519 /* Check if APP Table has changed */
520 if (memcmp(&new_cfg->app, &old_cfg->app, sizeof(new_cfg->app))) {
521 need_reconfig = true;
522 dev_dbg(dev, "APP Table change detected.\n");
523 }
524
525 dev_dbg(dev, "dcb need_reconfig=%d\n", need_reconfig);
526 return need_reconfig;
527}
528
529/**
530 * ice_dcb_rebuild - rebuild DCB post reset
531 * @pf: physical function instance
532 */
533void ice_dcb_rebuild(struct ice_pf *pf)
534{
535 struct ice_aqc_port_ets_elem buf = { 0 };
536 struct device *dev = ice_pf_to_dev(pf);
537 struct ice_dcbx_cfg *err_cfg;
538 int ret;
539
540 ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
541 if (ret) {
542 dev_err(dev, "Query Port ETS failed\n");
543 goto dcb_error;
544 }
545
546 mutex_lock(&pf->tc_mutex);
547
548 if (!pf->hw.port_info->qos_cfg.is_sw_lldp)
549 ice_cfg_etsrec_defaults(pf->hw.port_info);
550
551 ret = ice_set_dcb_cfg(pf->hw.port_info);
552 if (ret) {
553 dev_err(dev, "Failed to set DCB config in rebuild\n");
554 goto dcb_error;
555 }
556
557 if (!pf->hw.port_info->qos_cfg.is_sw_lldp) {
558 ret = ice_cfg_lldp_mib_change(&pf->hw, true);
559 if (ret && !pf->hw.port_info->qos_cfg.is_sw_lldp) {
560 dev_err(dev, "Failed to register for MIB changes\n");
561 goto dcb_error;
562 }
563 }
564
565 dev_info(dev, "DCB info restored\n");
566 ret = ice_query_port_ets(pf->hw.port_info, &buf, sizeof(buf), NULL);
567 if (ret) {
568 dev_err(dev, "Query Port ETS failed\n");
569 goto dcb_error;
570 }
571
572 mutex_unlock(&pf->tc_mutex);
573
574 return;
575
576dcb_error:
577 dev_err(dev, "Disabling DCB until new settings occur\n");
578 err_cfg = kzalloc(sizeof(*err_cfg), GFP_KERNEL);
579 if (!err_cfg) {
580 mutex_unlock(&pf->tc_mutex);
581 return;
582 }
583
584 err_cfg->etscfg.willing = true;
585 err_cfg->etscfg.tcbwtable[0] = ICE_TC_MAX_BW;
586 err_cfg->etscfg.tsatable[0] = ICE_IEEE_TSA_ETS;
587 memcpy(&err_cfg->etsrec, &err_cfg->etscfg, sizeof(err_cfg->etsrec));
588 /* Coverity warns the return code of ice_pf_dcb_cfg() is not checked
589 * here as is done for other calls to that function. That check is
590 * not necessary since this is in this function's error cleanup path.
591 * Suppress the Coverity warning with the following comment...
592 */
593 /* coverity[check_return] */
594 ice_pf_dcb_cfg(pf, err_cfg, false);
595 kfree(err_cfg);
596
597 mutex_unlock(&pf->tc_mutex);
598}
599
600/**
601 * ice_dcb_init_cfg - set the initial DCB config in SW
602 * @pf: PF to apply config to
603 * @locked: Is the RTNL held
604 */
605static int ice_dcb_init_cfg(struct ice_pf *pf, bool locked)
606{
607 struct ice_dcbx_cfg *newcfg;
608 struct ice_port_info *pi;
609 int ret = 0;
610
611 pi = pf->hw.port_info;
612 newcfg = kmemdup(&pi->qos_cfg.local_dcbx_cfg, sizeof(*newcfg),
613 GFP_KERNEL);
614 if (!newcfg)
615 return -ENOMEM;
616
617 memset(&pi->qos_cfg.local_dcbx_cfg, 0, sizeof(*newcfg));
618
619 dev_info(ice_pf_to_dev(pf), "Configuring initial DCB values\n");
620 if (ice_pf_dcb_cfg(pf, newcfg, locked))
621 ret = -EINVAL;
622
623 kfree(newcfg);
624
625 return ret;
626}
627
628/**
629 * ice_dcb_sw_dflt_cfg - Apply a default DCB config
630 * @pf: PF to apply config to
631 * @ets_willing: configure ETS willing
632 * @locked: was this function called with RTNL held
633 */
634int ice_dcb_sw_dflt_cfg(struct ice_pf *pf, bool ets_willing, bool locked)
635{
636 struct ice_aqc_port_ets_elem buf = { 0 };
637 struct ice_dcbx_cfg *dcbcfg;
638 struct ice_port_info *pi;
639 struct ice_hw *hw;
640 int ret;
641
642 hw = &pf->hw;
643 pi = hw->port_info;
644 dcbcfg = kzalloc(sizeof(*dcbcfg), GFP_KERNEL);
645 if (!dcbcfg)
646 return -ENOMEM;
647
648 memset(&pi->qos_cfg.local_dcbx_cfg, 0, sizeof(*dcbcfg));
649
650 dcbcfg->etscfg.willing = ets_willing ? 1 : 0;
651 dcbcfg->etscfg.maxtcs = hw->func_caps.common_cap.maxtc;
652 dcbcfg->etscfg.tcbwtable[0] = 100;
653 dcbcfg->etscfg.tsatable[0] = ICE_IEEE_TSA_ETS;
654
655 memcpy(&dcbcfg->etsrec, &dcbcfg->etscfg,
656 sizeof(dcbcfg->etsrec));
657 dcbcfg->etsrec.willing = 0;
658
659 dcbcfg->pfc.willing = 1;
660 dcbcfg->pfc.pfccap = hw->func_caps.common_cap.maxtc;
661
662 dcbcfg->numapps = 1;
663 dcbcfg->app[0].selector = ICE_APP_SEL_ETHTYPE;
664 dcbcfg->app[0].priority = 3;
665 dcbcfg->app[0].prot_id = ETH_P_FCOE;
666
667 ret = ice_pf_dcb_cfg(pf, dcbcfg, locked);
668 kfree(dcbcfg);
669 if (ret)
670 return ret;
671
672 return ice_query_port_ets(pi, &buf, sizeof(buf), NULL);
673}
674
675/**
676 * ice_dcb_tc_contig - Check that TCs are contiguous
677 * @prio_table: pointer to priority table
678 *
679 * Check if TCs begin with TC0 and are contiguous
680 */
681static bool ice_dcb_tc_contig(u8 *prio_table)
682{
683 bool found_empty = false;
684 u8 used_tc = 0;
685 int i;
686
687 /* Create a bitmap of used TCs */
688 for (i = 0; i < CEE_DCBX_MAX_PRIO; i++)
689 used_tc |= BIT(prio_table[i]);
690
691 for (i = 0; i < CEE_DCBX_MAX_PRIO; i++) {
692 if (used_tc & BIT(i)) {
693 if (found_empty)
694 return false;
695 } else {
696 found_empty = true;
697 }
698 }
699
700 return true;
701}
702
703/**
704 * ice_dcb_noncontig_cfg - Configure DCB for non-contiguous TCs
705 * @pf: pointer to the PF struct
706 *
707 * If non-contiguous TCs, then configure SW DCB with TC0 and ETS non-willing
708 */
709static int ice_dcb_noncontig_cfg(struct ice_pf *pf)
710{
711 struct ice_dcbx_cfg *dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
712 struct device *dev = ice_pf_to_dev(pf);
713 int ret;
714
715 /* Configure SW DCB default with ETS non-willing */
716 ret = ice_dcb_sw_dflt_cfg(pf, false, true);
717 if (ret) {
718 dev_err(dev, "Failed to set local DCB config %d\n", ret);
719 return ret;
720 }
721
722 /* Reconfigure with ETS willing so that FW will send LLDP MIB event */
723 dcbcfg->etscfg.willing = 1;
724 ret = ice_set_dcb_cfg(pf->hw.port_info);
725 if (ret)
726 dev_err(dev, "Failed to set DCB to unwilling\n");
727
728 return ret;
729}
730
731/**
732 * ice_pf_dcb_recfg - Reconfigure all VEBs and VSIs
733 * @pf: pointer to the PF struct
734 * @locked: is adev device lock held
735 *
736 * Assumed caller has already disabled all VSIs before
737 * calling this function. Reconfiguring DCB based on
738 * local_dcbx_cfg.
739 */
740void ice_pf_dcb_recfg(struct ice_pf *pf, bool locked)
741{
742 struct ice_dcbx_cfg *dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
743 struct iidc_event *event;
744 u8 tc_map = 0;
745 int v, ret;
746
747 /* Update each VSI */
748 ice_for_each_vsi(pf, v) {
749 struct ice_vsi *vsi = pf->vsi[v];
750
751 if (!vsi)
752 continue;
753
754 if (vsi->type == ICE_VSI_PF) {
755 tc_map = ice_dcb_get_ena_tc(dcbcfg);
756
757 /* If DCBX request non-contiguous TC, then configure
758 * default TC
759 */
760 if (!ice_dcb_tc_contig(dcbcfg->etscfg.prio_table)) {
761 tc_map = ICE_DFLT_TRAFFIC_CLASS;
762 ice_dcb_noncontig_cfg(pf);
763 }
764 } else if (vsi->type == ICE_VSI_CHNL) {
765 tc_map = BIT(ice_get_first_droptc(vsi));
766 } else {
767 tc_map = ICE_DFLT_TRAFFIC_CLASS;
768 }
769
770 ret = ice_vsi_cfg_tc(vsi, tc_map);
771 if (ret) {
772 dev_err(ice_pf_to_dev(pf), "Failed to config TC for VSI index: %d\n",
773 vsi->idx);
774 continue;
775 }
776 /* no need to proceed with remaining cfg if it is CHNL
777 * or switchdev VSI
778 */
779 if (vsi->type == ICE_VSI_CHNL)
780 continue;
781
782 ice_vsi_map_rings_to_vectors(vsi);
783 if (vsi->type == ICE_VSI_PF)
784 ice_dcbnl_set_all(vsi);
785 }
786 if (!locked) {
787 /* Notify the AUX drivers that TC change is finished */
788 event = kzalloc(sizeof(*event), GFP_KERNEL);
789 if (!event)
790 return;
791
792 set_bit(IIDC_EVENT_AFTER_TC_CHANGE, event->type);
793 ice_send_event_to_aux(pf, event);
794 kfree(event);
795 }
796}
797
798/**
799 * ice_init_pf_dcb - initialize DCB for a PF
800 * @pf: PF to initialize DCB for
801 * @locked: Was function called with RTNL held
802 */
803int ice_init_pf_dcb(struct ice_pf *pf, bool locked)
804{
805 struct device *dev = ice_pf_to_dev(pf);
806 struct ice_port_info *port_info;
807 struct ice_hw *hw = &pf->hw;
808 int err;
809
810 port_info = hw->port_info;
811
812 err = ice_init_dcb(hw, false);
813 if (err && !port_info->qos_cfg.is_sw_lldp) {
814 dev_err(dev, "Error initializing DCB %d\n", err);
815 goto dcb_init_err;
816 }
817
818 dev_info(dev, "DCB is enabled in the hardware, max number of TCs supported on this port are %d\n",
819 pf->hw.func_caps.common_cap.maxtc);
820 if (err) {
821 struct ice_vsi *pf_vsi;
822
823 /* FW LLDP is disabled, activate SW DCBX/LLDP mode */
824 dev_info(dev, "FW LLDP is disabled, DCBx/LLDP in SW mode.\n");
825 clear_bit(ICE_FLAG_FW_LLDP_AGENT, pf->flags);
826 err = ice_aq_set_pfc_mode(&pf->hw, ICE_AQC_PFC_VLAN_BASED_PFC,
827 NULL);
828 if (err)
829 dev_info(dev, "Failed to set VLAN PFC mode\n");
830
831 err = ice_dcb_sw_dflt_cfg(pf, true, locked);
832 if (err) {
833 dev_err(dev, "Failed to set local DCB config %d\n",
834 err);
835 err = -EIO;
836 goto dcb_init_err;
837 }
838
839 /* If the FW DCBX engine is not running then Rx LLDP packets
840 * need to be redirected up the stack.
841 */
842 pf_vsi = ice_get_main_vsi(pf);
843 if (!pf_vsi) {
844 dev_err(dev, "Failed to set local DCB config\n");
845 err = -EIO;
846 goto dcb_init_err;
847 }
848
849 ice_cfg_sw_lldp(pf_vsi, false, true);
850
851 pf->dcbx_cap = ice_dcb_get_mode(port_info, true);
852 return 0;
853 }
854
855 set_bit(ICE_FLAG_FW_LLDP_AGENT, pf->flags);
856
857 /* DCBX/LLDP enabled in FW, set DCBNL mode advertisement */
858 pf->dcbx_cap = ice_dcb_get_mode(port_info, false);
859
860 err = ice_dcb_init_cfg(pf, locked);
861 if (err)
862 goto dcb_init_err;
863
864 return 0;
865
866dcb_init_err:
867 dev_err(dev, "DCB init failed\n");
868 return err;
869}
870
871/**
872 * ice_update_dcb_stats - Update DCB stats counters
873 * @pf: PF whose stats needs to be updated
874 */
875void ice_update_dcb_stats(struct ice_pf *pf)
876{
877 struct ice_hw_port_stats *prev_ps, *cur_ps;
878 struct ice_hw *hw = &pf->hw;
879 u8 port;
880 int i;
881
882 port = hw->port_info->lport;
883 prev_ps = &pf->stats_prev;
884 cur_ps = &pf->stats;
885
886 if (ice_is_reset_in_progress(pf->state))
887 pf->stat_prev_loaded = false;
888
889 for (i = 0; i < 8; i++) {
890 ice_stat_update32(hw, GLPRT_PXOFFRXC(port, i),
891 pf->stat_prev_loaded,
892 &prev_ps->priority_xoff_rx[i],
893 &cur_ps->priority_xoff_rx[i]);
894 ice_stat_update32(hw, GLPRT_PXONRXC(port, i),
895 pf->stat_prev_loaded,
896 &prev_ps->priority_xon_rx[i],
897 &cur_ps->priority_xon_rx[i]);
898 ice_stat_update32(hw, GLPRT_PXONTXC(port, i),
899 pf->stat_prev_loaded,
900 &prev_ps->priority_xon_tx[i],
901 &cur_ps->priority_xon_tx[i]);
902 ice_stat_update32(hw, GLPRT_PXOFFTXC(port, i),
903 pf->stat_prev_loaded,
904 &prev_ps->priority_xoff_tx[i],
905 &cur_ps->priority_xoff_tx[i]);
906 ice_stat_update32(hw, GLPRT_RXON2OFFCNT(port, i),
907 pf->stat_prev_loaded,
908 &prev_ps->priority_xon_2_xoff[i],
909 &cur_ps->priority_xon_2_xoff[i]);
910 }
911}
912
913/**
914 * ice_tx_prepare_vlan_flags_dcb - prepare VLAN tagging for DCB
915 * @tx_ring: ring to send buffer on
916 * @first: pointer to struct ice_tx_buf
917 *
918 * This should not be called if the outer VLAN is software offloaded as the VLAN
919 * tag will already be configured with the correct ID and priority bits
920 */
921void
922ice_tx_prepare_vlan_flags_dcb(struct ice_tx_ring *tx_ring,
923 struct ice_tx_buf *first)
924{
925 struct sk_buff *skb = first->skb;
926
927 if (!test_bit(ICE_FLAG_DCB_ENA, tx_ring->vsi->back->flags))
928 return;
929
930 /* Insert 802.1p priority into VLAN header */
931 if ((first->tx_flags & ICE_TX_FLAGS_HW_VLAN ||
932 first->tx_flags & ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN) ||
933 skb->priority != TC_PRIO_CONTROL) {
934 first->vid &= ~VLAN_PRIO_MASK;
935 /* Mask the lower 3 bits to set the 802.1p priority */
936 first->vid |= FIELD_PREP(VLAN_PRIO_MASK, skb->priority);
937 /* if this is not already set it means a VLAN 0 + priority needs
938 * to be offloaded
939 */
940 if (tx_ring->flags & ICE_TX_FLAGS_RING_VLAN_L2TAG2)
941 first->tx_flags |= ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN;
942 else
943 first->tx_flags |= ICE_TX_FLAGS_HW_VLAN;
944 }
945}
946
947/**
948 * ice_dcb_is_mib_change_pending - Check if MIB change is pending
949 * @state: MIB change state
950 */
951static bool ice_dcb_is_mib_change_pending(u8 state)
952{
953 return ICE_AQ_LLDP_MIB_CHANGE_PENDING ==
954 FIELD_GET(ICE_AQ_LLDP_MIB_CHANGE_STATE_M, state);
955}
956
957/**
958 * ice_dcb_process_lldp_set_mib_change - Process MIB change
959 * @pf: ptr to ice_pf
960 * @event: pointer to the admin queue receive event
961 */
962void
963ice_dcb_process_lldp_set_mib_change(struct ice_pf *pf,
964 struct ice_rq_event_info *event)
965{
966 struct ice_aqc_port_ets_elem buf = { 0 };
967 struct device *dev = ice_pf_to_dev(pf);
968 struct ice_aqc_lldp_get_mib *mib;
969 struct ice_dcbx_cfg tmp_dcbx_cfg;
970 bool pending_handled = true;
971 bool need_reconfig = false;
972 struct ice_port_info *pi;
973 u8 mib_type;
974 int ret;
975
976 /* Not DCB capable or capability disabled */
977 if (!(test_bit(ICE_FLAG_DCB_CAPABLE, pf->flags)))
978 return;
979
980 if (pf->dcbx_cap & DCB_CAP_DCBX_HOST) {
981 dev_dbg(dev, "MIB Change Event in HOST mode\n");
982 return;
983 }
984
985 pi = pf->hw.port_info;
986 mib = (struct ice_aqc_lldp_get_mib *)&event->desc.params.raw;
987
988 /* Ignore if event is not for Nearest Bridge */
989 mib_type = FIELD_GET(ICE_AQ_LLDP_BRID_TYPE_M, mib->type);
990 dev_dbg(dev, "LLDP event MIB bridge type 0x%x\n", mib_type);
991 if (mib_type != ICE_AQ_LLDP_BRID_TYPE_NEAREST_BRID)
992 return;
993
994 /* A pending change event contains accurate config information, and
995 * the FW setting has not been updaed yet, so detect if change is
996 * pending to determine where to pull config information from
997 * (FW vs event)
998 */
999 if (ice_dcb_is_mib_change_pending(mib->state))
1000 pending_handled = false;
1001
1002 /* Check MIB Type and return if event for Remote MIB update */
1003 mib_type = FIELD_GET(ICE_AQ_LLDP_MIB_TYPE_M, mib->type);
1004 dev_dbg(dev, "LLDP event mib type %s\n", mib_type ? "remote" : "local");
1005 if (mib_type == ICE_AQ_LLDP_MIB_REMOTE) {
1006 /* Update the remote cached instance and return */
1007 if (!pending_handled) {
1008 ice_get_dcb_cfg_from_mib_change(pi, event);
1009 } else {
1010 ret =
1011 ice_aq_get_dcb_cfg(pi->hw, ICE_AQ_LLDP_MIB_REMOTE,
1012 ICE_AQ_LLDP_BRID_TYPE_NEAREST_BRID,
1013 &pi->qos_cfg.remote_dcbx_cfg);
1014 if (ret)
1015 dev_dbg(dev, "Failed to get remote DCB config\n");
1016 }
1017 return;
1018 }
1019
1020 /* That a DCB change has happened is now determined */
1021 mutex_lock(&pf->tc_mutex);
1022
1023 /* store the old configuration */
1024 tmp_dcbx_cfg = pi->qos_cfg.local_dcbx_cfg;
1025
1026 /* Reset the old DCBX configuration data */
1027 memset(&pi->qos_cfg.local_dcbx_cfg, 0,
1028 sizeof(pi->qos_cfg.local_dcbx_cfg));
1029
1030 /* Get updated DCBX data from firmware */
1031 if (!pending_handled) {
1032 ice_get_dcb_cfg_from_mib_change(pi, event);
1033 } else {
1034 ret = ice_get_dcb_cfg(pi);
1035 if (ret) {
1036 dev_err(dev, "Failed to get DCB config\n");
1037 goto out;
1038 }
1039 }
1040
1041 /* No change detected in DCBX configs */
1042 if (!memcmp(&tmp_dcbx_cfg, &pi->qos_cfg.local_dcbx_cfg,
1043 sizeof(tmp_dcbx_cfg))) {
1044 dev_dbg(dev, "No change detected in DCBX configuration.\n");
1045 goto out;
1046 }
1047
1048 pf->dcbx_cap = ice_dcb_get_mode(pi, false);
1049
1050 need_reconfig = ice_dcb_need_recfg(pf, &tmp_dcbx_cfg,
1051 &pi->qos_cfg.local_dcbx_cfg);
1052 ice_dcbnl_flush_apps(pf, &tmp_dcbx_cfg, &pi->qos_cfg.local_dcbx_cfg);
1053 if (!need_reconfig)
1054 goto out;
1055
1056 /* Enable DCB tagging only when more than one TC */
1057 if (ice_dcb_get_num_tc(&pi->qos_cfg.local_dcbx_cfg) > 1) {
1058 dev_dbg(dev, "DCB tagging enabled (num TC > 1)\n");
1059 set_bit(ICE_FLAG_DCB_ENA, pf->flags);
1060 } else {
1061 dev_dbg(dev, "DCB tagging disabled (num TC = 1)\n");
1062 clear_bit(ICE_FLAG_DCB_ENA, pf->flags);
1063 }
1064
1065 /* Send Execute Pending MIB Change event if it is a Pending event */
1066 if (!pending_handled) {
1067 ice_lldp_execute_pending_mib(&pf->hw);
1068 pending_handled = true;
1069 }
1070
1071 rtnl_lock();
1072 /* disable VSIs affected by DCB changes */
1073 ice_dcb_ena_dis_vsi(pf, false, true);
1074
1075 ret = ice_query_port_ets(pi, &buf, sizeof(buf), NULL);
1076 if (ret) {
1077 dev_err(dev, "Query Port ETS failed\n");
1078 goto unlock_rtnl;
1079 }
1080
1081 /* changes in configuration update VSI */
1082 ice_pf_dcb_recfg(pf, false);
1083
1084 /* enable previously downed VSIs */
1085 ice_dcb_ena_dis_vsi(pf, true, true);
1086unlock_rtnl:
1087 rtnl_unlock();
1088out:
1089 mutex_unlock(&pf->tc_mutex);
1090
1091 /* Send Execute Pending MIB Change event if it is a Pending event */
1092 if (!pending_handled)
1093 ice_lldp_execute_pending_mib(&pf->hw);
1094}