drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c

   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
   8 static 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, "Only full TC hardware offload is supported\n");
  24                 return -EINVAL;
  25         } else if (mqprio->mode != TC_MQPRIO_MODE_CHANNEL) {
  26                 netdev_err(dev, "Only channel mode offload is supported\n");
  27                 return -EINVAL;
  28         } else if (mqprio->shaper != TC_MQPRIO_SHAPER_BW_RATE) {
  29                 netdev_err(dev, "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                            "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, &speed, NULL);
  39         if (ret) {
  40                 netdev_err(dev, "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                                            "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                            "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
  94 static 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                        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_init(&eosw_txq->qresume_tsk, cxgb4_ethofld_restart,
 118                      (unsigned long)eosw_txq);
 119         return 0;
 120 }
 121
 122 static void cxgb4_clean_eosw_txq(struct net_device *dev,
 123                                  struct sge_eosw_txq *eosw_txq)
 124 {
 125         struct adapter *adap = netdev2adap(dev);
 126
 127         cxgb4_eosw_txq_free_desc(adap, eosw_txq, eosw_txq->ndesc);
 128         eosw_txq->pidx = 0;
 129         eosw_txq->last_pidx = 0;
 130         eosw_txq->cidx = 0;
 131         eosw_txq->last_cidx = 0;
 132         eosw_txq->flowc_idx = 0;
 133         eosw_txq->inuse = 0;
 134         eosw_txq->cred = adap->params.ofldq_wr_cred;
 135         eosw_txq->ncompl = 0;
 136         eosw_txq->last_compl = 0;
 137         eosw_txq->state = CXGB4_EO_STATE_CLOSED;
 138 }
 139
 140 static void cxgb4_free_eosw_txq(struct net_device *dev,
 141                                 struct sge_eosw_txq *eosw_txq)
 142 {
 143         spin_lock_bh(&eosw_txq->lock);
 144         cxgb4_clean_eosw_txq(dev, eosw_txq);
 145         kfree(eosw_txq->desc);
 146         spin_unlock_bh(&eosw_txq->lock);
 147         tasklet_kill(&eosw_txq->qresume_tsk);
 148 }
 149
 150 static int cxgb4_mqprio_alloc_hw_resources(struct net_device *dev)
 151 {
 152         struct port_info *pi = netdev2pinfo(dev);
 153         struct adapter *adap = netdev2adap(dev);
 154         struct sge_ofld_rxq *eorxq;
 155         struct sge_eohw_txq *eotxq;
 156         int ret, msix = 0;
 157         u32 i;
 158
 159         /* Allocate ETHOFLD hardware queue structures if not done already */
 160         if (!refcount_read(&adap->tc_mqprio->refcnt)) {
 161                 adap->sge.eohw_rxq = kcalloc(adap->sge.eoqsets,
 162                                              sizeof(struct sge_ofld_rxq),
 163                                              GFP_KERNEL);
 164                 if (!adap->sge.eohw_rxq)
 165                         return -ENOMEM;
 166
 167                 adap->sge.eohw_txq = kcalloc(adap->sge.eoqsets,
 168                                              sizeof(struct sge_eohw_txq),
 169                                              GFP_KERNEL);
 170                 if (!adap->sge.eohw_txq) {
 171                         kfree(adap->sge.eohw_rxq);
 172                         return -ENOMEM;
 173                 }
 174
 175                 refcount_set(&adap->tc_mqprio->refcnt, 1);
 176         } else {
 177                 refcount_inc(&adap->tc_mqprio->refcnt);
 178         }
 179
 180         if (!(adap->flags & CXGB4_USING_MSIX))
 181                 msix = -((int)adap->sge.intrq.abs_id + 1);
 182
 183         for (i = 0; i < pi->nqsets; i++) {
 184                 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
 185                 eotxq = &adap->sge.eohw_txq[pi->first_qset + i];
 186
 187                 /* Allocate Rxqs for receiving ETHOFLD Tx completions */
 188                 if (msix >= 0) {
 189                         msix = cxgb4_get_msix_idx_from_bmap(adap);
 190                         if (msix < 0) {
 191                                 ret = msix;
 192                                 goto out_free_queues;
 193                         }
 194
 195                         eorxq->msix = &adap->msix_info[msix];
 196                         snprintf(eorxq->msix->desc,
 197                                  sizeof(eorxq->msix->desc),
 198                                  "%s-eorxq%d", dev->name, i);
 199                 }
 200
 201                 init_rspq(adap, &eorxq->rspq,
 202                           CXGB4_EOHW_RXQ_DEFAULT_INTR_USEC,
 203                           CXGB4_EOHW_RXQ_DEFAULT_PKT_CNT,
 204                           CXGB4_EOHW_RXQ_DEFAULT_DESC_NUM,
 205                           CXGB4_EOHW_RXQ_DEFAULT_DESC_SIZE);
 206
 207                 eorxq->fl.size = CXGB4_EOHW_FLQ_DEFAULT_DESC_NUM;
 208
 209                 ret = t4_sge_alloc_rxq(adap, &eorxq->rspq, false,
 210                                        dev, msix, &eorxq->fl,
 211                                        cxgb4_ethofld_rx_handler,
 212                                        NULL, 0);
 213                 if (ret)
 214                         goto out_free_queues;
 215
 216                 /* Allocate ETHOFLD hardware Txqs */
 217                 eotxq->q.size = CXGB4_EOHW_TXQ_DEFAULT_DESC_NUM;
 218                 ret = t4_sge_alloc_ethofld_txq(adap, eotxq, dev,
 219                                                eorxq->rspq.cntxt_id);
 220                 if (ret)
 221                         goto out_free_queues;
 222
 223                 /* Allocate IRQs, set IRQ affinity, and start Rx */
 224                 if (adap->flags & CXGB4_USING_MSIX) {
 225                         ret = request_irq(eorxq->msix->vec, t4_sge_intr_msix, 0,
 226                                           eorxq->msix->desc, &eorxq->rspq);
 227                         if (ret)
 228                                 goto out_free_msix;
 229
 230                         cxgb4_set_msix_aff(adap, eorxq->msix->vec,
 231                                            &eorxq->msix->aff_mask, i);
 232                 }
 233
 234                 if (adap->flags & CXGB4_FULL_INIT_DONE)
 235                         cxgb4_enable_rx(adap, &eorxq->rspq);
 236         }
 237
 238         return 0;
 239
 240 out_free_msix:
 241         while (i-- > 0) {
 242                 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
 243
 244                 if (adap->flags & CXGB4_FULL_INIT_DONE)
 245                         cxgb4_quiesce_rx(&eorxq->rspq);
 246
 247                 if (adap->flags & CXGB4_USING_MSIX) {
 248                         cxgb4_clear_msix_aff(eorxq->msix->vec,
 249                                              eorxq->msix->aff_mask);
 250                         free_irq(eorxq->msix->vec, &eorxq->rspq);
 251                 }
 252         }
 253
 254 out_free_queues:
 255         for (i = 0; i < pi->nqsets; i++) {
 256                 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
 257                 eotxq = &adap->sge.eohw_txq[pi->first_qset + i];
 258
 259                 if (eorxq->rspq.desc)
 260                         free_rspq_fl(adap, &eorxq->rspq, &eorxq->fl);
 261                 if (eorxq->msix)
 262                         cxgb4_free_msix_idx_in_bmap(adap, eorxq->msix->idx);
 263                 t4_sge_free_ethofld_txq(adap, eotxq);
 264         }
 265
 266         if (refcount_dec_and_test(&adap->tc_mqprio->refcnt)) {
 267                 kfree(adap->sge.eohw_txq);
 268                 kfree(adap->sge.eohw_rxq);
 269         }
 270         return ret;
 271 }
 272
 273 static void cxgb4_mqprio_free_hw_resources(struct net_device *dev)
 274 {
 275         struct port_info *pi = netdev2pinfo(dev);
 276         struct adapter *adap = netdev2adap(dev);
 277         struct sge_ofld_rxq *eorxq;
 278         struct sge_eohw_txq *eotxq;
 279         u32 i;
 280
 281         /* Return if no ETHOFLD structures have been allocated yet */
 282         if (!refcount_read(&adap->tc_mqprio->refcnt))
 283                 return;
 284
 285         /* Return if no hardware queues have been allocated */
 286         if (!adap->sge.eohw_rxq[pi->first_qset].rspq.desc)
 287                 return;
 288
 289         for (i = 0; i < pi->nqsets; i++) {
 290                 eorxq = &adap->sge.eohw_rxq[pi->first_qset + i];
 291                 eotxq = &adap->sge.eohw_txq[pi->first_qset + i];
 292
 293                 /* Device removal path will already disable NAPI
 294                  * before unregistering netdevice. So, only disable
 295                  * NAPI if we're not in device removal path
 296                  */
 297                 if (!(adap->flags & CXGB4_SHUTTING_DOWN))
 298                         cxgb4_quiesce_rx(&eorxq->rspq);
 299
 300                 if (adap->flags & CXGB4_USING_MSIX) {
 301                         cxgb4_clear_msix_aff(eorxq->msix->vec,
 302                                              eorxq->msix->aff_mask);
 303                         free_irq(eorxq->msix->vec, &eorxq->rspq);
 304                 }
 305
 306                 free_rspq_fl(adap, &eorxq->rspq, &eorxq->fl);
 307                 t4_sge_free_ethofld_txq(adap, eotxq);
 308         }
 309
 310         /* Free up ETHOFLD structures if there are no users */
 311         if (refcount_dec_and_test(&adap->tc_mqprio->refcnt)) {
 312                 kfree(adap->sge.eohw_txq);
 313                 kfree(adap->sge.eohw_rxq);
 314         }
 315 }
 316
 317 static 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(mqprio->min_rate[i] * 8, 1000);
 342                 p.u.params.maxrate = div_u64(mqprio->max_rate[i] * 8, 1000);
 343
 344                 e = cxgb4_sched_class_alloc(dev, &p);
 345                 if (!e) {
 346                         ret = -ENOMEM;
 347                         goto out_err;
 348                 }
 349
 350                 tc_port_mqprio->tc_hwtc_map[i] = e->idx;
 351         }
 352
 353         return 0;
 354
 355 out_err:
 356         while (i--)
 357                 cxgb4_sched_class_free(dev, tc_port_mqprio->tc_hwtc_map[i]);
 358
 359         return ret;
 360 }
 361
 362 static void cxgb4_mqprio_free_tc(struct net_device *dev)
 363 {
 364         struct cxgb4_tc_port_mqprio *tc_port_mqprio;
 365         struct port_info *pi = netdev2pinfo(dev);
 366         struct adapter *adap = netdev2adap(dev);
 367         u8 i;
 368
 369         tc_port_mqprio = &adap->tc_mqprio->port_mqprio[pi->port_id];
 370         for (i = 0; i < tc_port_mqprio->mqprio.qopt.num_tc; i++)
 371                 cxgb4_sched_class_free(dev, tc_port_mqprio->tc_hwtc_map[i]);
 372 }
 373
 374 static int cxgb4_mqprio_class_bind(struct net_device *dev,
 375                                    struct sge_eosw_txq *eosw_txq,
 376                                    u8 tc)
 377 {
 378         struct ch_sched_flowc fe;
 379         int ret;
 380
 381         init_completion(&eosw_txq->completion);
 382
 383         fe.tid = eosw_txq->eotid;
 384         fe.class = tc;
 385
 386         ret = cxgb4_sched_class_bind(dev, &fe, SCHED_FLOWC);
 387         if (ret)
 388                 return ret;
 389
 390         ret = wait_for_completion_timeout(&eosw_txq->completion,
 391                                           CXGB4_FLOWC_WAIT_TIMEOUT);
 392         if (!ret)
 393                 return -ETIMEDOUT;
 394
 395         return 0;
 396 }
 397
 398 static void cxgb4_mqprio_class_unbind(struct net_device *dev,
 399                                       struct sge_eosw_txq *eosw_txq,
 400                                       u8 tc)
 401 {
 402         struct adapter *adap = netdev2adap(dev);
 403         struct ch_sched_flowc fe;
 404
 405         /* If we're shutting down, interrupts are disabled and no completions
 406          * come back. So, skip waiting for completions in this scenario.
 407          */
 408         if (!(adap->flags & CXGB4_SHUTTING_DOWN))
 409                 init_completion(&eosw_txq->completion);
 410
 411         fe.tid = eosw_txq->eotid;
 412         fe.class = tc;
 413         cxgb4_sched_class_unbind(dev, &fe, SCHED_FLOWC);
 414
 415         if (!(adap->flags & CXGB4_SHUTTING_DOWN))
 416                 wait_for_completion_timeout(&eosw_txq->completion,
 417                                             CXGB4_FLOWC_WAIT_TIMEOUT);
 418 }
 419
 420 static int cxgb4_mqprio_enable_offload(struct net_device *dev,
 421                                        struct tc_mqprio_qopt_offload *mqprio)
 422 {
 423         struct cxgb4_tc_port_mqprio *tc_port_mqprio;
 424         u32 qoffset, qcount, tot_qcount, qid, hwqid;
 425         struct port_info *pi = netdev2pinfo(dev);
 426         struct adapter *adap = netdev2adap(dev);
 427         struct sge_eosw_txq *eosw_txq;
 428         int eotid, ret;
 429         u16 i, j;
 430         u8 hwtc;
 431
 432         ret = cxgb4_mqprio_alloc_hw_resources(dev);
 433         if (ret)
 434                 return -ENOMEM;
 435
 436         tc_port_mqprio = &adap->tc_mqprio->port_mqprio[pi->port_id];
 437         for (i = 0; i < mqprio->qopt.num_tc; i++) {
 438                 qoffset = mqprio->qopt.offset[i];
 439                 qcount = mqprio->qopt.count[i];
 440                 for (j = 0; j < qcount; j++) {
 441                         eotid = cxgb4_get_free_eotid(&adap->tids);
 442                         if (eotid < 0) {
 443                                 ret = -ENOMEM;
 444                                 goto out_free_eotids;
 445                         }
 446
 447                         qid = qoffset + j;
 448                         hwqid = pi->first_qset + (eotid % pi->nqsets);
 449                         eosw_txq = &tc_port_mqprio->eosw_txq[qid];
 450                         ret = cxgb4_init_eosw_txq(dev, eosw_txq,
 451                                                   eotid, hwqid);
 452                         if (ret)
 453                                 goto out_free_eotids;
 454
 455                         cxgb4_alloc_eotid(&adap->tids, eotid, eosw_txq);
 456
 457                         hwtc = tc_port_mqprio->tc_hwtc_map[i];
 458                         ret = cxgb4_mqprio_class_bind(dev, eosw_txq, hwtc);
 459                         if (ret)
 460                                 goto out_free_eotids;
 461                 }
 462         }
 463
 464         memcpy(&tc_port_mqprio->mqprio, mqprio,
 465                sizeof(struct tc_mqprio_qopt_offload));
 466
 467         /* Inform the stack about the configured tc params.
 468          *
 469          * Set the correct queue map. If no queue count has been
 470          * specified, then send the traffic through default NIC
 471          * queues; instead of ETHOFLD queues.
 472          */
 473         ret = netdev_set_num_tc(dev, mqprio->qopt.num_tc);
 474         if (ret)
 475                 goto out_free_eotids;
 476
 477         tot_qcount = pi->nqsets;
 478         for (i = 0; i < mqprio->qopt.num_tc; i++) {
 479                 qcount = mqprio->qopt.count[i];
 480                 if (qcount) {
 481                         qoffset = mqprio->qopt.offset[i] + pi->nqsets;
 482                 } else {
 483                         qcount = pi->nqsets;
 484                         qoffset = 0;
 485                 }
 486
 487                 ret = netdev_set_tc_queue(dev, i, qcount, qoffset);
 488                 if (ret)
 489                         goto out_reset_tc;
 490
 491                 tot_qcount += mqprio->qopt.count[i];
 492         }
 493
 494         ret = netif_set_real_num_tx_queues(dev, tot_qcount);
 495         if (ret)
 496                 goto out_reset_tc;
 497
 498         tc_port_mqprio->state = CXGB4_MQPRIO_STATE_ACTIVE;
 499         return 0;
 500
 501 out_reset_tc:
 502         netdev_reset_tc(dev);
 503         i = mqprio->qopt.num_tc;
 504
 505 out_free_eotids:
 506         while (i-- > 0) {
 507                 qoffset = mqprio->qopt.offset[i];
 508                 qcount = mqprio->qopt.count[i];
 509                 for (j = 0; j < qcount; j++) {
 510                         eosw_txq = &tc_port_mqprio->eosw_txq[qoffset + j];
 511
 512                         hwtc = tc_port_mqprio->tc_hwtc_map[i];
 513                         cxgb4_mqprio_class_unbind(dev, eosw_txq, hwtc);
 514
 515                         cxgb4_free_eotid(&adap->tids, eosw_txq->eotid);
 516                         cxgb4_free_eosw_txq(dev, eosw_txq);
 517                 }
 518         }
 519
 520         cxgb4_mqprio_free_hw_resources(dev);
 521         return ret;
 522 }
 523
 524 static void cxgb4_mqprio_disable_offload(struct net_device *dev)
 525 {
 526         struct cxgb4_tc_port_mqprio *tc_port_mqprio;
 527         struct port_info *pi = netdev2pinfo(dev);
 528         struct adapter *adap = netdev2adap(dev);
 529         struct sge_eosw_txq *eosw_txq;
 530         u32 qoffset, qcount;
 531         u16 i, j;
 532         u8 hwtc;
 533
 534         tc_port_mqprio = &adap->tc_mqprio->port_mqprio[pi->port_id];
 535         if (tc_port_mqprio->state != CXGB4_MQPRIO_STATE_ACTIVE)
 536                 return;
 537
 538         netdev_reset_tc(dev);
 539         netif_set_real_num_tx_queues(dev, pi->nqsets);
 540
 541         for (i = 0; i < tc_port_mqprio->mqprio.qopt.num_tc; i++) {
 542                 qoffset = tc_port_mqprio->mqprio.qopt.offset[i];
 543                 qcount = tc_port_mqprio->mqprio.qopt.count[i];
 544                 for (j = 0; j < qcount; j++) {
 545                         eosw_txq = &tc_port_mqprio->eosw_txq[qoffset + j];
 546
 547                         hwtc = tc_port_mqprio->tc_hwtc_map[i];
 548                         cxgb4_mqprio_class_unbind(dev, eosw_txq, hwtc);
 549
 550                         cxgb4_free_eotid(&adap->tids, eosw_txq->eotid);
 551                         cxgb4_free_eosw_txq(dev, eosw_txq);
 552                 }
 553         }
 554
 555         cxgb4_mqprio_free_hw_resources(dev);
 556
 557         /* Free up the traffic classes */
 558         cxgb4_mqprio_free_tc(dev);
 559
 560         memset(&tc_port_mqprio->mqprio, 0,
 561                sizeof(struct tc_mqprio_qopt_offload));
 562
 563         tc_port_mqprio->state = CXGB4_MQPRIO_STATE_DISABLED;
 564 }
 565
 566 int cxgb4_setup_tc_mqprio(struct net_device *dev,
 567                           struct tc_mqprio_qopt_offload *mqprio)
 568 {
 569         bool needs_bring_up = false;
 570         int ret;
 571
 572         ret = cxgb4_mqprio_validate(dev, mqprio);
 573         if (ret)
 574                 return ret;
 575
 576         /* To configure tc params, the current allocated EOTIDs must
 577          * be freed up. However, they can't be freed up if there's
 578          * traffic running on the interface. So, ensure interface is
 579          * down before configuring tc params.
 580          */
 581         if (netif_running(dev)) {
 582                 cxgb_close(dev);
 583                 needs_bring_up = true;
 584         }
 585
 586         cxgb4_mqprio_disable_offload(dev);
 587
 588         /* If requested for clear, then just return since resources are
 589          * already freed up by now.
 590          */
 591         if (!mqprio->qopt.num_tc)
 592                 goto out;
 593
 594         /* Allocate free available traffic classes and configure
 595          * their rate parameters.
 596          */
 597         ret = cxgb4_mqprio_alloc_tc(dev, mqprio);
 598         if (ret)
 599                 goto out;
 600
 601         ret = cxgb4_mqprio_enable_offload(dev, mqprio);
 602         if (ret) {
 603                 cxgb4_mqprio_free_tc(dev);
 604                 goto out;
 605         }
 606
 607 out:
 608         if (needs_bring_up)
 609                 cxgb_open(dev);
 610
 611         return ret;
 612 }
 613
 614 int cxgb4_init_tc_mqprio(struct adapter *adap)
 615 {
 616         struct cxgb4_tc_port_mqprio *tc_port_mqprio, *port_mqprio;
 617         struct cxgb4_tc_mqprio *tc_mqprio;
 618         struct sge_eosw_txq *eosw_txq;
 619         int ret = 0;
 620         u8 i;
 621
 622         tc_mqprio = kzalloc(sizeof(*tc_mqprio), GFP_KERNEL);
 623         if (!tc_mqprio)
 624                 return -ENOMEM;
 625
 626         tc_port_mqprio = kcalloc(adap->params.nports, sizeof(*tc_port_mqprio),
 627                                  GFP_KERNEL);
 628         if (!tc_port_mqprio) {
 629                 ret = -ENOMEM;
 630                 goto out_free_mqprio;
 631         }
 632
 633         tc_mqprio->port_mqprio = tc_port_mqprio;
 634         for (i = 0; i < adap->params.nports; i++) {
 635                 port_mqprio = &tc_mqprio->port_mqprio[i];
 636                 eosw_txq = kcalloc(adap->tids.neotids, sizeof(*eosw_txq),
 637                                    GFP_KERNEL);
 638                 if (!eosw_txq) {
 639                         ret = -ENOMEM;
 640                         goto out_free_ports;
 641                 }
 642                 port_mqprio->eosw_txq = eosw_txq;
 643         }
 644
 645         adap->tc_mqprio = tc_mqprio;
 646         refcount_set(&adap->tc_mqprio->refcnt, 0);
 647         return 0;
 648
 649 out_free_ports:
 650         for (i = 0; i < adap->params.nports; i++) {
 651                 port_mqprio = &tc_mqprio->port_mqprio[i];
 652                 kfree(port_mqprio->eosw_txq);
 653         }
 654         kfree(tc_port_mqprio);
 655
 656 out_free_mqprio:
 657         kfree(tc_mqprio);
 658         return ret;
 659 }
 660
 661 void cxgb4_cleanup_tc_mqprio(struct adapter *adap)
 662 {
 663         struct cxgb4_tc_port_mqprio *port_mqprio;
 664         u8 i;
 665
 666         if (adap->tc_mqprio) {
 667                 if (adap->tc_mqprio->port_mqprio) {
 668                         for (i = 0; i < adap->params.nports; i++) {
 669                                 struct net_device *dev = adap->port[i];
 670
 671                                 if (dev)
 672                                         cxgb4_mqprio_disable_offload(dev);
 673                                 port_mqprio = &adap->tc_mqprio->port_mqprio[i];
 674                                 kfree(port_mqprio->eosw_txq);
 675                         }
 676                         kfree(adap->tc_mqprio->port_mqprio);
 677                 }
 678                 kfree(adap->tc_mqprio);
 679         }
 680 }