drivers/net/ethernet/intel/ice/ice_dcb_lib.c

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