1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (C) 2019 Chelsio Communications. All rights reserved. */
3
4#include "cxgb4.h"
5#include "cxgb4_tc_mqprio.h"
6#include "sched.h"
7
8static int cxgb4_mqprio_validate(struct net_device *dev,
9 struct tc_mqprio_qopt_offload *mqprio)
10{
11 u64 min_rate = 0, max_rate = 0, max_link_rate;
12 struct port_info *pi = netdev2pinfo(dev);
13 struct adapter *adap = netdev2adap(dev);
14 u32 speed, qcount = 0, qoffset = 0;
15 u32 start_a, start_b, end_a, end_b;
16 int ret;
17 u8 i, j;
18
19 if (!mqprio->qopt.num_tc)
20 return 0;
21
22 if (mqprio->qopt.hw != TC_MQPRIO_HW_OFFLOAD_TCS) {
23 netdev_err(dev, format: "Only full TC hardware offload is supported\n");
24 return -EINVAL;
25 } else if (mqprio->mode != TC_MQPRIO_MODE_CHANNEL) {
26 netdev_err(dev, format: "Only channel mode offload is supported\n");
27 return -EINVAL;
28 } else if (mqprio->shaper != TC_MQPRIO_SHAPER_BW_RATE) {
29 netdev_err(dev, format: "Only bandwidth rate shaper supported\n");
30 return -EINVAL;
31 } else if (mqprio->qopt.num_tc > adap->params.nsched_cls) {
32 netdev_err(dev,
33 format: "Only %u traffic classes supported by hardware\n",
34 adap->params.nsched_cls);
35 return -ERANGE;
36 }
37
38 ret = t4_get_link_params(pi, NULL, speedp: &speed, NULL);
39 if (ret) {
40 netdev_err(dev, format: "Failed to get link speed, ret: %d\n", ret);
41 return -EINVAL;
42 }
43
44 /* Convert from Mbps to bps */
45 max_link_rate = (u64)speed * 1000 * 1000;
46
47 for (i = 0; i < mqprio->qopt.num_tc; i++) {
48 qoffset = max_t(u16, mqprio->qopt.offset[i], qoffset);
49 qcount += mqprio->qopt.count[i];
50
51 start_a = mqprio->qopt.offset[i];
52 end_a = start_a + mqprio->qopt.count[i] - 1;
53 for (j = i + 1; j < mqprio->qopt.num_tc; j++) {
54 start_b = mqprio->qopt.offset[j];
55 end_b = start_b + mqprio->qopt.count[j] - 1;
56
57 /* If queue count is 0, then the traffic
58 * belonging to this class will not use
59 * ETHOFLD queues. So, no need to validate
60 * further.
61 */
62 if (!mqprio->qopt.count[i])
63 break;
64
65 if (!mqprio->qopt.count[j])
66 continue;
67
68 if (max_t(u32, start_a, start_b) <=
69 min_t(u32, end_a, end_b)) {
70 netdev_err(dev,
71 format: "Queues can't overlap across tc\n");
72 return -EINVAL;
73 }
74 }
75
76 /* Convert byte per second to bits per second */
77 min_rate += (mqprio->min_rate[i] * 8);
78 max_rate += (mqprio->max_rate[i] * 8);
79 }
80
81 if (qoffset >= adap->tids.neotids || qcount > adap->tids.neotids)
82 return -ENOMEM;
83
84 if (min_rate > max_link_rate || max_rate > max_link_rate) {
85 netdev_err(dev,
86 format: "Total Min/Max (%llu/%llu) Rate > supported (%llu)\n",
87 min_rate, max_rate, max_link_rate);
88 return -EINVAL;
89 }
90
91 return 0;
92}
93
94static int cxgb4_init_eosw_txq(struct net_device *dev,
95 struct sge_eosw_txq *eosw_txq,
96 u32 eotid, u32 hwqid)
97{
98 struct adapter *adap = netdev2adap(dev);
99 struct tx_sw_desc *ring;
100
101 memset(eosw_txq, 0, sizeof(*eosw_txq));
102
103 ring = kcalloc(CXGB4_EOSW_TXQ_DEFAULT_DESC_NUM,
104 size: sizeof(*ring), GFP_KERNEL);
105 if (!ring)
106 return -ENOMEM;
107
108 eosw_txq->desc = ring;
109 eosw_txq->ndesc = CXGB4_EOSW_TXQ_DEFAULT_DESC_NUM;
110 spin_lock_init(&eosw_txq->lock);
111 eosw_txq->state = CXGB4_EO_STATE_CLOSED;
112 eosw_txq->eotid = eotid;
113 eosw_txq->hwtid = adap->tids.eotid_base + eosw_txq->eotid;
114 eosw_txq->cred = adap->params.ofldq_wr_cred;
115 eosw_txq->hwqid = hwqid;
116 eosw_txq->netdev = dev;
117 tasklet_setup(t: &eosw_txq->qresume_tsk, callback: cxgb4_ethofld_restart);
118 return 0;
119}
120
121static void cxgb4_clean_eosw_txq(struct net_device *dev,
122 struct sge_eosw_txq *eosw_txq)
123{
124 struct adapter *adap = netdev2adap(dev);
125
126 cxgb4_eosw_txq_free_desc(adap, txq: eosw_txq, ndesc: eosw_txq->ndesc);
127 eosw_txq->pidx = 0;
128 eosw_txq->last_pidx = 0;
129 eosw_txq->cidx = 0;
130 eosw_txq->last_cidx = 0;
131 eosw_txq->flowc_idx = 0;
132 eosw_txq->inuse = 0;
133 eosw_txq->cred = adap->params.ofldq_wr_cred;
134 eosw_txq->ncompl = 0;
135 eosw_txq->last_compl = 0;
136 eosw_txq->state = CXGB4_EO_STATE_CLOSED;
137}
138
139static void cxgb4_free_eosw_txq(struct net_device *dev,
140 struct sge_eosw_txq *eosw_txq)
141{
142 spin_lock_bh(lock: &eosw_txq->lock);
143 cxgb4_clean_eosw_txq(dev, eosw_txq);
144 kfree(objp: eosw_txq->desc);
145 spin_unlock_bh(lock: &eosw_txq->lock);
146 tasklet_kill(t: &eosw_txq->qresume_tsk);
147}
148
149static int cxgb4_mqprio_alloc_hw_resources(struct net_device *dev)
150{
151 struct port_info *pi = netdev2pinfo(dev);
152 struct adapter *adap = netdev2adap(dev);
153 struct sge_ofld_rxq *eorxq;
154 struct sge_eohw_txq *eotxq;
155 int ret, msix = 0;
156 u32 i;
157
158 /* Allocate ETHOFLD hardware queue structures if not done already */
159 if (!refcount_read(r: &adap->tc_mqprio->refcnt)) {
160 adap->sge.eohw_rxq = kcalloc(n: adap->sge.eoqsets,
161 size: sizeof(struct sge_ofld_rxq),
162 GFP_KERNEL);
163 if (!adap->sge.eohw_rxq)
164 return -ENOMEM;
165
166 adap->sge.eohw_txq = kcalloc(n: adap->sge.eoqsets,
167 size: sizeof(struct sge_eohw_txq),
168 GFP_KERNEL);
169 if (!adap->sge.eohw_txq) {
170 kfree(objp: adap->sge.eohw_rxq);
171 return -ENOMEM;
172 }
173
174 refcount_set(r: &adap->tc_mqprio->refcnt, n: 1);
175 } else {
176 refcount_inc(r: &adap->tc_mqprio->refcnt);
177 }
178
179 if (!(adap->flags & CXGB4_USING_MSIX))
180 msix = -((int)adap->sge.intrq.abs_id + 1);
181
182 for (i = 0; i < pi->nqsets; i++) {
183 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
184 eotxq = &adap->sge.eohw_txq[pi->first_qset + i];
185
186 /* Allocate Rxqs for receiving ETHOFLD Tx completions */
187 if (msix >= 0) {
188 msix = cxgb4_get_msix_idx_from_bmap(adap);
189 if (msix < 0) {
190 ret = msix;
191 goto out_free_queues;
192 }
193
194 eorxq->msix = &adap->msix_info[msix];
195 snprintf(buf: eorxq->msix->desc,
196 size: sizeof(eorxq->msix->desc),
197 fmt: "%s-eorxq%d", dev->name, i);
198 }
199
200 init_rspq(adap, q: &eorxq->rspq,
201 CXGB4_EOHW_RXQ_DEFAULT_INTR_USEC,
202 CXGB4_EOHW_RXQ_DEFAULT_PKT_CNT,
203 CXGB4_EOHW_RXQ_DEFAULT_DESC_NUM,
204 CXGB4_EOHW_RXQ_DEFAULT_DESC_SIZE);
205
206 eorxq->fl.size = CXGB4_EOHW_FLQ_DEFAULT_DESC_NUM;
207
208 ret = t4_sge_alloc_rxq(adap, iq: &eorxq->rspq, fwevtq: false,
209 dev, intr_idx: msix, fl: &eorxq->fl,
210 hnd: cxgb4_ethofld_rx_handler,
211 NULL, cong: 0);
212 if (ret)
213 goto out_free_queues;
214
215 /* Allocate ETHOFLD hardware Txqs */
216 eotxq->q.size = CXGB4_EOHW_TXQ_DEFAULT_DESC_NUM;
217 ret = t4_sge_alloc_ethofld_txq(adap, txq: eotxq, dev,
218 iqid: eorxq->rspq.cntxt_id);
219 if (ret)
220 goto out_free_queues;
221
222 /* Allocate IRQs, set IRQ affinity, and start Rx */
223 if (adap->flags & CXGB4_USING_MSIX) {
224 ret = request_irq(irq: eorxq->msix->vec, handler: t4_sge_intr_msix, flags: 0,
225 name: eorxq->msix->desc, dev: &eorxq->rspq);
226 if (ret)
227 goto out_free_msix;
228
229 cxgb4_set_msix_aff(adap, vec: eorxq->msix->vec,
230 aff_mask: &eorxq->msix->aff_mask, idx: i);
231 }
232
233 if (adap->flags & CXGB4_FULL_INIT_DONE)
234 cxgb4_enable_rx(adap, q: &eorxq->rspq);
235 }
236
237 return 0;
238
239out_free_msix:
240 while (i-- > 0) {
241 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
242
243 if (adap->flags & CXGB4_FULL_INIT_DONE)
244 cxgb4_quiesce_rx(q: &eorxq->rspq);
245
246 if (adap->flags & CXGB4_USING_MSIX) {
247 cxgb4_clear_msix_aff(vec: eorxq->msix->vec,
248 aff_mask: eorxq->msix->aff_mask);
249 free_irq(eorxq->msix->vec, &eorxq->rspq);
250 }
251 }
252
253out_free_queues:
254 for (i = 0; i < pi->nqsets; i++) {
255 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
256 eotxq = &adap->sge.eohw_txq[pi->first_qset + i];
257
258 if (eorxq->rspq.desc)
259 free_rspq_fl(adap, rq: &eorxq->rspq, fl: &eorxq->fl);
260 if (eorxq->msix)
261 cxgb4_free_msix_idx_in_bmap(adap, msix_idx: eorxq->msix->idx);
262 t4_sge_free_ethofld_txq(adap, txq: eotxq);
263 }
264
265 if (refcount_dec_and_test(r: &adap->tc_mqprio->refcnt)) {
266 kfree(objp: adap->sge.eohw_txq);
267 kfree(objp: adap->sge.eohw_rxq);
268 }
269 return ret;
270}
271
272static void cxgb4_mqprio_free_hw_resources(struct net_device *dev)
273{
274 struct port_info *pi = netdev2pinfo(dev);
275 struct adapter *adap = netdev2adap(dev);
276 struct sge_ofld_rxq *eorxq;
277 struct sge_eohw_txq *eotxq;
278 u32 i;
279
280 /* Return if no ETHOFLD structures have been allocated yet */
281 if (!refcount_read(r: &adap->tc_mqprio->refcnt))
282 return;
283
284 /* Return if no hardware queues have been allocated */
285 if (!adap->sge.eohw_rxq[pi->first_qset].rspq.desc)
286 return;
287
288 for (i = 0; i < pi->nqsets; i++) {
289 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
290 eotxq = &adap->sge.eohw_txq[pi->first_qset + i];
291
292 /* Device removal path will already disable NAPI
293 * before unregistering netdevice. So, only disable
294 * NAPI if we're not in device removal path
295 */
296 if (!(adap->flags & CXGB4_SHUTTING_DOWN))
297 cxgb4_quiesce_rx(q: &eorxq->rspq);
298
299 if (adap->flags & CXGB4_USING_MSIX) {
300 cxgb4_clear_msix_aff(vec: eorxq->msix->vec,
301 aff_mask: eorxq->msix->aff_mask);
302 free_irq(eorxq->msix->vec, &eorxq->rspq);
303 cxgb4_free_msix_idx_in_bmap(adap, msix_idx: eorxq->msix->idx);
304 }
305
306 free_rspq_fl(adap, rq: &eorxq->rspq, fl: &eorxq->fl);
307 t4_sge_free_ethofld_txq(adap, txq: eotxq);
308 }
309
310 /* Free up ETHOFLD structures if there are no users */
311 if (refcount_dec_and_test(r: &adap->tc_mqprio->refcnt)) {
312 kfree(objp: adap->sge.eohw_txq);
313 kfree(objp: adap->sge.eohw_rxq);
314 }
315}
316
317static int cxgb4_mqprio_alloc_tc(struct net_device *dev,
318 struct tc_mqprio_qopt_offload *mqprio)
319{
320 struct ch_sched_params p = {
321 .type = SCHED_CLASS_TYPE_PACKET,
322 .u.params.level = SCHED_CLASS_LEVEL_CL_RL,
323 .u.params.mode = SCHED_CLASS_MODE_FLOW,
324 .u.params.rateunit = SCHED_CLASS_RATEUNIT_BITS,
325 .u.params.ratemode = SCHED_CLASS_RATEMODE_ABS,
326 .u.params.class = SCHED_CLS_NONE,
327 .u.params.weight = 0,
328 .u.params.pktsize = dev->mtu,
329 };
330 struct cxgb4_tc_port_mqprio *tc_port_mqprio;
331 struct port_info *pi = netdev2pinfo(dev);
332 struct adapter *adap = netdev2adap(dev);
333 struct sched_class *e;
334 int ret;
335 u8 i;
336
337 tc_port_mqprio = &adap->tc_mqprio->port_mqprio[pi->port_id];
338 p.u.params.channel = pi->tx_chan;
339 for (i = 0; i < mqprio->qopt.num_tc; i++) {
340 /* Convert from bytes per second to Kbps */
341 p.u.params.minrate = div_u64(dividend: mqprio->min_rate[i] * 8, divisor: 1000);
342 p.u.params.maxrate = div_u64(dividend: mqprio->max_rate[i] * 8, divisor: 1000);
343
344 /* Request larger burst buffer for smaller MTU, so
345 * that hardware can work on more data per burst
346 * cycle.
347 */
348 if (dev->mtu <= ETH_DATA_LEN)
349 p.u.params.burstsize = 8 * dev->mtu;
350
351 e = cxgb4_sched_class_alloc(dev, p: &p);
352 if (!e) {
353 ret = -ENOMEM;
354 goto out_err;
355 }
356
357 tc_port_mqprio->tc_hwtc_map[i] = e->idx;
358 }
359
360 return 0;
361
362out_err:
363 while (i--)
364 cxgb4_sched_class_free(dev, classid: tc_port_mqprio->tc_hwtc_map[i]);
365
366 return ret;
367}
368
369static void cxgb4_mqprio_free_tc(struct net_device *dev)
370{
371 struct cxgb4_tc_port_mqprio *tc_port_mqprio;
372 struct port_info *pi = netdev2pinfo(dev);
373 struct adapter *adap = netdev2adap(dev);
374 u8 i;
375
376 tc_port_mqprio = &adap->tc_mqprio->port_mqprio[pi->port_id];
377 for (i = 0; i < tc_port_mqprio->mqprio.qopt.num_tc; i++)
378 cxgb4_sched_class_free(dev, classid: tc_port_mqprio->tc_hwtc_map[i]);
379}
380
381static int cxgb4_mqprio_class_bind(struct net_device *dev,
382 struct sge_eosw_txq *eosw_txq,
383 u8 tc)
384{
385 struct ch_sched_flowc fe;
386 int ret;
387
388 init_completion(x: &eosw_txq->completion);
389
390 fe.tid = eosw_txq->eotid;
391 fe.class = tc;
392
393 ret = cxgb4_sched_class_bind(dev, arg: &fe, type: SCHED_FLOWC);
394 if (ret)
395 return ret;
396
397 ret = wait_for_completion_timeout(x: &eosw_txq->completion,
398 CXGB4_FLOWC_WAIT_TIMEOUT);
399 if (!ret)
400 return -ETIMEDOUT;
401
402 return 0;
403}
404
405static void cxgb4_mqprio_class_unbind(struct net_device *dev,
406 struct sge_eosw_txq *eosw_txq,
407 u8 tc)
408{
409 struct adapter *adap = netdev2adap(dev);
410 struct ch_sched_flowc fe;
411
412 /* If we're shutting down, interrupts are disabled and no completions
413 * come back. So, skip waiting for completions in this scenario.
414 */
415 if (!(adap->flags & CXGB4_SHUTTING_DOWN))
416 init_completion(x: &eosw_txq->completion);
417
418 fe.tid = eosw_txq->eotid;
419 fe.class = tc;
420 cxgb4_sched_class_unbind(dev, arg: &fe, type: SCHED_FLOWC);
421
422 if (!(adap->flags & CXGB4_SHUTTING_DOWN))
423 wait_for_completion_timeout(x: &eosw_txq->completion,
424 CXGB4_FLOWC_WAIT_TIMEOUT);
425}
426
427static int cxgb4_mqprio_enable_offload(struct net_device *dev,
428 struct tc_mqprio_qopt_offload *mqprio)
429{
430 struct cxgb4_tc_port_mqprio *tc_port_mqprio;
431 u32 qoffset, qcount, tot_qcount, qid, hwqid;
432 struct port_info *pi = netdev2pinfo(dev);
433 struct adapter *adap = netdev2adap(dev);
434 struct sge_eosw_txq *eosw_txq;
435 int eotid, ret;
436 u16 i, j;
437 u8 hwtc;
438
439 ret = cxgb4_mqprio_alloc_hw_resources(dev);
440 if (ret)
441 return -ENOMEM;
442
443 tc_port_mqprio = &adap->tc_mqprio->port_mqprio[pi->port_id];
444 for (i = 0; i < mqprio->qopt.num_tc; i++) {
445 qoffset = mqprio->qopt.offset[i];
446 qcount = mqprio->qopt.count[i];
447 for (j = 0; j < qcount; j++) {
448 eotid = cxgb4_get_free_eotid(t: &adap->tids);
449 if (eotid < 0) {
450 ret = -ENOMEM;
451 goto out_free_eotids;
452 }
453
454 qid = qoffset + j;
455 hwqid = pi->first_qset + (eotid % pi->nqsets);
456 eosw_txq = &tc_port_mqprio->eosw_txq[qid];
457 ret = cxgb4_init_eosw_txq(dev, eosw_txq,
458 eotid, hwqid);
459 if (ret)
460 goto out_free_eotids;
461
462 cxgb4_alloc_eotid(t: &adap->tids, eotid, data: eosw_txq);
463
464 hwtc = tc_port_mqprio->tc_hwtc_map[i];
465 ret = cxgb4_mqprio_class_bind(dev, eosw_txq, tc: hwtc);
466 if (ret)
467 goto out_free_eotids;
468 }
469 }
470
471 memcpy(&tc_port_mqprio->mqprio, mqprio,
472 sizeof(struct tc_mqprio_qopt_offload));
473
474 /* Inform the stack about the configured tc params.
475 *
476 * Set the correct queue map. If no queue count has been
477 * specified, then send the traffic through default NIC
478 * queues; instead of ETHOFLD queues.
479 */
480 ret = netdev_set_num_tc(dev, num_tc: mqprio->qopt.num_tc);
481 if (ret)
482 goto out_free_eotids;
483
484 tot_qcount = pi->nqsets;
485 for (i = 0; i < mqprio->qopt.num_tc; i++) {
486 qcount = mqprio->qopt.count[i];
487 if (qcount) {
488 qoffset = mqprio->qopt.offset[i] + pi->nqsets;
489 } else {
490 qcount = pi->nqsets;
491 qoffset = 0;
492 }
493
494 ret = netdev_set_tc_queue(dev, tc: i, count: qcount, offset: qoffset);
495 if (ret)
496 goto out_reset_tc;
497
498 tot_qcount += mqprio->qopt.count[i];
499 }
500
501 ret = netif_set_real_num_tx_queues(dev, txq: tot_qcount);
502 if (ret)
503 goto out_reset_tc;
504
505 tc_port_mqprio->state = CXGB4_MQPRIO_STATE_ACTIVE;
506 return 0;
507
508out_reset_tc:
509 netdev_reset_tc(dev);
510 i = mqprio->qopt.num_tc;
511
512out_free_eotids:
513 while (i-- > 0) {
514 qoffset = mqprio->qopt.offset[i];
515 qcount = mqprio->qopt.count[i];
516 for (j = 0; j < qcount; j++) {
517 eosw_txq = &tc_port_mqprio->eosw_txq[qoffset + j];
518
519 hwtc = tc_port_mqprio->tc_hwtc_map[i];
520 cxgb4_mqprio_class_unbind(dev, eosw_txq, tc: hwtc);
521
522 cxgb4_free_eotid(t: &adap->tids, eotid: eosw_txq->eotid);
523 cxgb4_free_eosw_txq(dev, eosw_txq);
524 }
525 }
526
527 cxgb4_mqprio_free_hw_resources(dev);
528 return ret;
529}
530
531static void cxgb4_mqprio_disable_offload(struct net_device *dev)
532{
533 struct cxgb4_tc_port_mqprio *tc_port_mqprio;
534 struct port_info *pi = netdev2pinfo(dev);
535 struct adapter *adap = netdev2adap(dev);
536 struct sge_eosw_txq *eosw_txq;
537 u32 qoffset, qcount;
538 u16 i, j;
539 u8 hwtc;
540
541 tc_port_mqprio = &adap->tc_mqprio->port_mqprio[pi->port_id];
542 if (tc_port_mqprio->state != CXGB4_MQPRIO_STATE_ACTIVE)
543 return;
544
545 netdev_reset_tc(dev);
546 netif_set_real_num_tx_queues(dev, txq: pi->nqsets);
547
548 for (i = 0; i < tc_port_mqprio->mqprio.qopt.num_tc; i++) {
549 qoffset = tc_port_mqprio->mqprio.qopt.offset[i];
550 qcount = tc_port_mqprio->mqprio.qopt.count[i];
551 for (j = 0; j < qcount; j++) {
552 eosw_txq = &tc_port_mqprio->eosw_txq[qoffset + j];
553
554 hwtc = tc_port_mqprio->tc_hwtc_map[i];
555 cxgb4_mqprio_class_unbind(dev, eosw_txq, tc: hwtc);
556
557 cxgb4_free_eotid(t: &adap->tids, eotid: eosw_txq->eotid);
558 cxgb4_free_eosw_txq(dev, eosw_txq);
559 }
560 }
561
562 cxgb4_mqprio_free_hw_resources(dev);
563
564 /* Free up the traffic classes */
565 cxgb4_mqprio_free_tc(dev);
566
567 memset(&tc_port_mqprio->mqprio, 0,
568 sizeof(struct tc_mqprio_qopt_offload));
569
570 tc_port_mqprio->state = CXGB4_MQPRIO_STATE_DISABLED;
571}
572
573int cxgb4_setup_tc_mqprio(struct net_device *dev,
574 struct tc_mqprio_qopt_offload *mqprio)
575{
576 struct adapter *adap = netdev2adap(dev);
577 bool needs_bring_up = false;
578 int ret;
579
580 ret = cxgb4_mqprio_validate(dev, mqprio);
581 if (ret)
582 return ret;
583
584 mutex_lock(&adap->tc_mqprio->mqprio_mutex);
585
586 /* To configure tc params, the current allocated EOTIDs must
587 * be freed up. However, they can't be freed up if there's
588 * traffic running on the interface. So, ensure interface is
589 * down before configuring tc params.
590 */
591 if (netif_running(dev)) {
592 netif_tx_stop_all_queues(dev);
593 netif_carrier_off(dev);
594 needs_bring_up = true;
595 }
596
597 cxgb4_mqprio_disable_offload(dev);
598
599 /* If requested for clear, then just return since resources are
600 * already freed up by now.
601 */
602 if (!mqprio->qopt.num_tc)
603 goto out;
604
605 /* Allocate free available traffic classes and configure
606 * their rate parameters.
607 */
608 ret = cxgb4_mqprio_alloc_tc(dev, mqprio);
609 if (ret)
610 goto out;
611
612 ret = cxgb4_mqprio_enable_offload(dev, mqprio);
613 if (ret) {
614 cxgb4_mqprio_free_tc(dev);
615 goto out;
616 }
617
618out:
619 if (needs_bring_up) {
620 netif_tx_start_all_queues(dev);
621 netif_carrier_on(dev);
622 }
623
624 mutex_unlock(lock: &adap->tc_mqprio->mqprio_mutex);
625 return ret;
626}
627
628void cxgb4_mqprio_stop_offload(struct adapter *adap)
629{
630 struct cxgb4_tc_port_mqprio *tc_port_mqprio;
631 struct net_device *dev;
632 u8 i;
633
634 if (!adap->tc_mqprio || !adap->tc_mqprio->port_mqprio)
635 return;
636
637 mutex_lock(&adap->tc_mqprio->mqprio_mutex);
638 for_each_port(adap, i) {
639 dev = adap->port[i];
640 if (!dev)
641 continue;
642
643 tc_port_mqprio = &adap->tc_mqprio->port_mqprio[i];
644 if (!tc_port_mqprio->mqprio.qopt.num_tc)
645 continue;
646
647 cxgb4_mqprio_disable_offload(dev);
648 }
649 mutex_unlock(lock: &adap->tc_mqprio->mqprio_mutex);
650}
651
652int cxgb4_init_tc_mqprio(struct adapter *adap)
653{
654 struct cxgb4_tc_port_mqprio *tc_port_mqprio, *port_mqprio;
655 struct cxgb4_tc_mqprio *tc_mqprio;
656 struct sge_eosw_txq *eosw_txq;
657 int ret = 0;
658 u8 i;
659
660 tc_mqprio = kzalloc(size: sizeof(*tc_mqprio), GFP_KERNEL);
661 if (!tc_mqprio)
662 return -ENOMEM;
663
664 tc_port_mqprio = kcalloc(n: adap->params.nports, size: sizeof(*tc_port_mqprio),
665 GFP_KERNEL);
666 if (!tc_port_mqprio) {
667 ret = -ENOMEM;
668 goto out_free_mqprio;
669 }
670
671 mutex_init(&tc_mqprio->mqprio_mutex);
672
673 tc_mqprio->port_mqprio = tc_port_mqprio;
674 for (i = 0; i < adap->params.nports; i++) {
675 port_mqprio = &tc_mqprio->port_mqprio[i];
676 eosw_txq = kcalloc(n: adap->tids.neotids, size: sizeof(*eosw_txq),
677 GFP_KERNEL);
678 if (!eosw_txq) {
679 ret = -ENOMEM;
680 goto out_free_ports;
681 }
682 port_mqprio->eosw_txq = eosw_txq;
683 }
684
685 adap->tc_mqprio = tc_mqprio;
686 refcount_set(r: &adap->tc_mqprio->refcnt, n: 0);
687 return 0;
688
689out_free_ports:
690 for (i = 0; i < adap->params.nports; i++) {
691 port_mqprio = &tc_mqprio->port_mqprio[i];
692 kfree(objp: port_mqprio->eosw_txq);
693 }
694 kfree(objp: tc_port_mqprio);
695
696out_free_mqprio:
697 kfree(objp: tc_mqprio);
698 return ret;
699}
700
701void cxgb4_cleanup_tc_mqprio(struct adapter *adap)
702{
703 struct cxgb4_tc_port_mqprio *port_mqprio;
704 u8 i;
705
706 if (adap->tc_mqprio) {
707 mutex_lock(&adap->tc_mqprio->mqprio_mutex);
708 if (adap->tc_mqprio->port_mqprio) {
709 for (i = 0; i < adap->params.nports; i++) {
710 struct net_device *dev = adap->port[i];
711
712 if (dev)
713 cxgb4_mqprio_disable_offload(dev);
714 port_mqprio = &adap->tc_mqprio->port_mqprio[i];
715 kfree(objp: port_mqprio->eosw_txq);
716 }
717 kfree(objp: adap->tc_mqprio->port_mqprio);
718 }
719 mutex_unlock(lock: &adap->tc_mqprio->mqprio_mutex);
720 kfree(objp: adap->tc_mqprio);
721 }
722}
723

source code of linux/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c