drivers/net/ethernet/netronome/nfp/abm/main.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 /* Copyright (C) 2018 Netronome Systems, Inc. */
   3
   4 #include <linux/bitfield.h>
   5 #include <linux/bitmap.h>
   6 #include <linux/etherdevice.h>
   7 #include <linux/lockdep.h>
   8 #include <linux/netdevice.h>
   9 #include <linux/rcupdate.h>
  10 #include <linux/rtnetlink.h>
  11 #include <linux/slab.h>
  12
  13 #include "../nfpcore/nfp.h"
  14 #include "../nfpcore/nfp_cpp.h"
  15 #include "../nfpcore/nfp_nsp.h"
  16 #include "../nfp_app.h"
  17 #include "../nfp_main.h"
  18 #include "../nfp_net.h"
  19 #include "../nfp_net_repr.h"
  20 #include "../nfp_port.h"
  21 #include "main.h"
  22
  23 static u32 nfp_abm_portid(enum nfp_repr_type rtype, unsigned int id)
  24 {
  25         return FIELD_PREP(NFP_ABM_PORTID_TYPE, rtype) |
  26                FIELD_PREP(NFP_ABM_PORTID_ID, id);
  27 }
  28
  29 static int
  30 nfp_abm_setup_tc(struct nfp_app *app, struct net_device *netdev,
  31                  enum tc_setup_type type, void *type_data)
  32 {
  33         struct nfp_repr *repr = netdev_priv(netdev);
  34         struct nfp_port *port;
  35
  36         port = nfp_port_from_netdev(netdev);
  37         if (!port || port->type != NFP_PORT_PF_PORT)
  38                 return -EOPNOTSUPP;
  39
  40         switch (type) {
  41         case TC_SETUP_ROOT_QDISC:
  42                 return nfp_abm_setup_root(netdev, repr->app_priv, type_data);
  43         case TC_SETUP_QDISC_MQ:
  44                 return nfp_abm_setup_tc_mq(netdev, repr->app_priv, type_data);
  45         case TC_SETUP_QDISC_RED:
  46                 return nfp_abm_setup_tc_red(netdev, repr->app_priv, type_data);
  47         case TC_SETUP_QDISC_GRED:
  48                 return nfp_abm_setup_tc_gred(netdev, repr->app_priv, type_data);
  49         case TC_SETUP_BLOCK:
  50                 return nfp_abm_setup_cls_block(netdev, repr, type_data);
  51         default:
  52                 return -EOPNOTSUPP;
  53         }
  54 }
  55
  56 static struct net_device *
  57 nfp_abm_repr_get(struct nfp_app *app, u32 port_id, bool *redir_egress)
  58 {
  59         enum nfp_repr_type rtype;
  60         struct nfp_reprs *reprs;
  61         u8 port;
  62
  63         rtype = FIELD_GET(NFP_ABM_PORTID_TYPE, port_id);
  64         port = FIELD_GET(NFP_ABM_PORTID_ID, port_id);
  65
  66         reprs = rcu_dereference(app->reprs[rtype]);
  67         if (!reprs)
  68                 return NULL;
  69
  70         if (port >= reprs->num_reprs)
  71                 return NULL;
  72
  73         return rcu_dereference(reprs->reprs[port]);
  74 }
  75
  76 static int
  77 nfp_abm_spawn_repr(struct nfp_app *app, struct nfp_abm_link *alink,
  78                    enum nfp_port_type ptype)
  79 {
  80         struct net_device *netdev;
  81         enum nfp_repr_type rtype;
  82         struct nfp_reprs *reprs;
  83         struct nfp_repr *repr;
  84         struct nfp_port *port;
  85         unsigned int txqs;
  86         int err;
  87
  88         if (ptype == NFP_PORT_PHYS_PORT) {
  89                 rtype = NFP_REPR_TYPE_PHYS_PORT;
  90                 txqs = 1;
  91         } else {
  92                 rtype = NFP_REPR_TYPE_PF;
  93                 txqs = alink->vnic->max_rx_rings;
  94         }
  95
  96         netdev = nfp_repr_alloc_mqs(app, txqs, 1);
  97         if (!netdev)
  98                 return -ENOMEM;
  99         repr = netdev_priv(netdev);
 100         repr->app_priv = alink;
 101
 102         port = nfp_port_alloc(app, ptype, netdev);
 103         if (IS_ERR(port)) {
 104                 err = PTR_ERR(port);
 105                 goto err_free_repr;
 106         }
 107
 108         if (ptype == NFP_PORT_PHYS_PORT) {
 109                 port->eth_forced = true;
 110                 err = nfp_port_init_phy_port(app->pf, app, port, alink->id);
 111                 if (err)
 112                         goto err_free_port;
 113         } else {
 114                 port->pf_id = alink->abm->pf_id;
 115                 port->pf_split = app->pf->max_data_vnics > 1;
 116                 port->pf_split_id = alink->id;
 117                 port->vnic = alink->vnic->dp.ctrl_bar;
 118         }
 119
 120         SET_NETDEV_DEV(netdev, &alink->vnic->pdev->dev);
 121         eth_hw_addr_random(netdev);
 122
 123         err = nfp_repr_init(app, netdev, nfp_abm_portid(rtype, alink->id),
 124                             port, alink->vnic->dp.netdev);
 125         if (err)
 126                 goto err_free_port;
 127
 128         reprs = nfp_reprs_get_locked(app, rtype);
 129         WARN(nfp_repr_get_locked(app, reprs, alink->id), "duplicate repr");
 130         rtnl_lock();
 131         rcu_assign_pointer(reprs->reprs[alink->id], netdev);
 132         rtnl_unlock();
 133
 134         nfp_info(app->cpp, "%s Port %d Representor(%s) created\n",
 135                  ptype == NFP_PORT_PF_PORT ? "PCIe" : "Phys",
 136                  alink->id, netdev->name);
 137
 138         return 0;
 139
 140 err_free_port:
 141         nfp_port_free(port);
 142 err_free_repr:
 143         nfp_repr_free(netdev);
 144         return err;
 145 }
 146
 147 static void
 148 nfp_abm_kill_repr(struct nfp_app *app, struct nfp_abm_link *alink,
 149                   enum nfp_repr_type rtype)
 150 {
 151         struct net_device *netdev;
 152         struct nfp_reprs *reprs;
 153
 154         reprs = nfp_reprs_get_locked(app, rtype);
 155         netdev = nfp_repr_get_locked(app, reprs, alink->id);
 156         if (!netdev)
 157                 return;
 158         rtnl_lock();
 159         rcu_assign_pointer(reprs->reprs[alink->id], NULL);
 160         rtnl_unlock();
 161         synchronize_rcu();
 162         /* Cast to make sure nfp_repr_clean_and_free() takes a nfp_repr */
 163         nfp_repr_clean_and_free((struct nfp_repr *)netdev_priv(netdev));
 164 }
 165
 166 static void
 167 nfp_abm_kill_reprs(struct nfp_abm *abm, struct nfp_abm_link *alink)
 168 {
 169         nfp_abm_kill_repr(abm->app, alink, NFP_REPR_TYPE_PF);
 170         nfp_abm_kill_repr(abm->app, alink, NFP_REPR_TYPE_PHYS_PORT);
 171 }
 172
 173 static void nfp_abm_kill_reprs_all(struct nfp_abm *abm)
 174 {
 175         struct nfp_pf *pf = abm->app->pf;
 176         struct nfp_net *nn;
 177
 178         list_for_each_entry(nn, &pf->vnics, vnic_list)
 179                 nfp_abm_kill_reprs(abm, (struct nfp_abm_link *)nn->app_priv);
 180 }
 181
 182 static enum devlink_eswitch_mode nfp_abm_eswitch_mode_get(struct nfp_app *app)
 183 {
 184         struct nfp_abm *abm = app->priv;
 185
 186         return abm->eswitch_mode;
 187 }
 188
 189 static int nfp_abm_eswitch_set_legacy(struct nfp_abm *abm)
 190 {
 191         nfp_abm_kill_reprs_all(abm);
 192         nfp_abm_ctrl_qm_disable(abm);
 193
 194         abm->eswitch_mode = DEVLINK_ESWITCH_MODE_LEGACY;
 195         return 0;
 196 }
 197
 198 static void nfp_abm_eswitch_clean_up(struct nfp_abm *abm)
 199 {
 200         if (abm->eswitch_mode != DEVLINK_ESWITCH_MODE_LEGACY)
 201                 WARN_ON(nfp_abm_eswitch_set_legacy(abm));
 202 }
 203
 204 static int nfp_abm_eswitch_set_switchdev(struct nfp_abm *abm)
 205 {
 206         struct nfp_app *app = abm->app;
 207         struct nfp_pf *pf = app->pf;
 208         struct nfp_net *nn;
 209         int err;
 210
 211         if (!abm->red_support)
 212                 return -EOPNOTSUPP;
 213
 214         err = nfp_abm_ctrl_qm_enable(abm);
 215         if (err)
 216                 return err;
 217
 218         list_for_each_entry(nn, &pf->vnics, vnic_list) {
 219                 struct nfp_abm_link *alink = nn->app_priv;
 220
 221                 err = nfp_abm_spawn_repr(app, alink, NFP_PORT_PHYS_PORT);
 222                 if (err)
 223                         goto err_kill_all_reprs;
 224
 225                 err = nfp_abm_spawn_repr(app, alink, NFP_PORT_PF_PORT);
 226                 if (err)
 227                         goto err_kill_all_reprs;
 228         }
 229
 230         abm->eswitch_mode = DEVLINK_ESWITCH_MODE_SWITCHDEV;
 231         return 0;
 232
 233 err_kill_all_reprs:
 234         nfp_abm_kill_reprs_all(abm);
 235         nfp_abm_ctrl_qm_disable(abm);
 236         return err;
 237 }
 238
 239 static int nfp_abm_eswitch_mode_set(struct nfp_app *app, u16 mode)
 240 {
 241         struct nfp_abm *abm = app->priv;
 242
 243         if (abm->eswitch_mode == mode)
 244                 return 0;
 245
 246         switch (mode) {
 247         case DEVLINK_ESWITCH_MODE_LEGACY:
 248                 return nfp_abm_eswitch_set_legacy(abm);
 249         case DEVLINK_ESWITCH_MODE_SWITCHDEV:
 250                 return nfp_abm_eswitch_set_switchdev(abm);
 251         default:
 252                 return -EINVAL;
 253         }
 254 }
 255
 256 static void
 257 nfp_abm_vnic_set_mac(struct nfp_pf *pf, struct nfp_abm *abm, struct nfp_net *nn,
 258                      unsigned int id)
 259 {
 260         struct nfp_eth_table_port *eth_port = &pf->eth_tbl->ports[id];
 261         u8 mac_addr[ETH_ALEN];
 262         struct nfp_nsp *nsp;
 263         char hwinfo[32];
 264         int err;
 265
 266         if (id > pf->eth_tbl->count) {
 267                 nfp_warn(pf->cpp, "No entry for persistent MAC address\n");
 268                 eth_hw_addr_random(nn->dp.netdev);
 269                 return;
 270         }
 271
 272         snprintf(hwinfo, sizeof(hwinfo), "eth%u.mac.pf%u",
 273                  eth_port->eth_index, abm->pf_id);
 274
 275         nsp = nfp_nsp_open(pf->cpp);
 276         if (IS_ERR(nsp)) {
 277                 nfp_warn(pf->cpp, "Failed to access the NSP for persistent MAC address: %ld\n",
 278                          PTR_ERR(nsp));
 279                 eth_hw_addr_random(nn->dp.netdev);
 280                 return;
 281         }
 282
 283         if (!nfp_nsp_has_hwinfo_lookup(nsp)) {
 284                 nfp_warn(pf->cpp, "NSP doesn't support PF MAC generation\n");
 285                 eth_hw_addr_random(nn->dp.netdev);
 286                 return;
 287         }
 288
 289         err = nfp_nsp_hwinfo_lookup(nsp, hwinfo, sizeof(hwinfo));
 290         nfp_nsp_close(nsp);
 291         if (err) {
 292                 nfp_warn(pf->cpp, "Reading persistent MAC address failed: %d\n",
 293                          err);
 294                 eth_hw_addr_random(nn->dp.netdev);
 295                 return;
 296         }
 297
 298         if (sscanf(hwinfo, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
 299                    &mac_addr[0], &mac_addr[1], &mac_addr[2],
 300                    &mac_addr[3], &mac_addr[4], &mac_addr[5]) != 6) {
 301                 nfp_warn(pf->cpp, "Can't parse persistent MAC address (%s)\n",
 302                          hwinfo);
 303                 eth_hw_addr_random(nn->dp.netdev);
 304                 return;
 305         }
 306
 307         ether_addr_copy(nn->dp.netdev->dev_addr, mac_addr);
 308         ether_addr_copy(nn->dp.netdev->perm_addr, mac_addr);
 309 }
 310
 311 static int
 312 nfp_abm_vnic_alloc(struct nfp_app *app, struct nfp_net *nn, unsigned int id)
 313 {
 314         struct nfp_eth_table_port *eth_port = &app->pf->eth_tbl->ports[id];
 315         struct nfp_abm *abm = app->priv;
 316         struct nfp_abm_link *alink;
 317         int err;
 318
 319         alink = kzalloc(sizeof(*alink), GFP_KERNEL);
 320         if (!alink)
 321                 return -ENOMEM;
 322         nn->app_priv = alink;
 323         alink->abm = abm;
 324         alink->vnic = nn;
 325         alink->id = id;
 326         alink->total_queues = alink->vnic->max_rx_rings;
 327
 328         INIT_LIST_HEAD(&alink->dscp_map);
 329
 330         err = nfp_abm_ctrl_read_params(alink);
 331         if (err)
 332                 goto err_free_alink;
 333
 334         alink->prio_map = kzalloc(abm->prio_map_len, GFP_KERNEL);
 335         if (!alink->prio_map)
 336                 goto err_free_alink;
 337
 338         /* This is a multi-host app, make sure MAC/PHY is up, but don't
 339          * make the MAC/PHY state follow the state of any of the ports.
 340          */
 341         err = nfp_eth_set_configured(app->cpp, eth_port->index, true);
 342         if (err < 0)
 343                 goto err_free_priomap;
 344
 345         netif_keep_dst(nn->dp.netdev);
 346
 347         nfp_abm_vnic_set_mac(app->pf, abm, nn, id);
 348         INIT_RADIX_TREE(&alink->qdiscs, GFP_KERNEL);
 349
 350         return 0;
 351
 352 err_free_priomap:
 353         kfree(alink->prio_map);
 354 err_free_alink:
 355         kfree(alink);
 356         return err;
 357 }
 358
 359 static void nfp_abm_vnic_free(struct nfp_app *app, struct nfp_net *nn)
 360 {
 361         struct nfp_abm_link *alink = nn->app_priv;
 362
 363         nfp_abm_kill_reprs(alink->abm, alink);
 364         WARN(!radix_tree_empty(&alink->qdiscs), "left over qdiscs\n");
 365         kfree(alink->prio_map);
 366         kfree(alink);
 367 }
 368
 369 static int nfp_abm_vnic_init(struct nfp_app *app, struct nfp_net *nn)
 370 {
 371         struct nfp_abm_link *alink = nn->app_priv;
 372
 373         if (nfp_abm_has_prio(alink->abm))
 374                 return nfp_abm_ctrl_prio_map_update(alink, alink->prio_map);
 375         return 0;
 376 }
 377
 378 static u64 *
 379 nfp_abm_port_get_stats(struct nfp_app *app, struct nfp_port *port, u64 *data)
 380 {
 381         struct nfp_repr *repr = netdev_priv(port->netdev);
 382         struct nfp_abm_link *alink;
 383         unsigned int i;
 384
 385         if (port->type != NFP_PORT_PF_PORT)
 386                 return data;
 387         alink = repr->app_priv;
 388         for (i = 0; i < alink->vnic->dp.num_r_vecs; i++) {
 389                 *data++ = nfp_abm_ctrl_stat_non_sto(alink, i);
 390                 *data++ = nfp_abm_ctrl_stat_sto(alink, i);
 391         }
 392         return data;
 393 }
 394
 395 static int
 396 nfp_abm_port_get_stats_count(struct nfp_app *app, struct nfp_port *port)
 397 {
 398         struct nfp_repr *repr = netdev_priv(port->netdev);
 399         struct nfp_abm_link *alink;
 400
 401         if (port->type != NFP_PORT_PF_PORT)
 402                 return 0;
 403         alink = repr->app_priv;
 404         return alink->vnic->dp.num_r_vecs * 2;
 405 }
 406
 407 static u8 *
 408 nfp_abm_port_get_stats_strings(struct nfp_app *app, struct nfp_port *port,
 409                                u8 *data)
 410 {
 411         struct nfp_repr *repr = netdev_priv(port->netdev);
 412         struct nfp_abm_link *alink;
 413         unsigned int i;
 414
 415         if (port->type != NFP_PORT_PF_PORT)
 416                 return data;
 417         alink = repr->app_priv;
 418         for (i = 0; i < alink->vnic->dp.num_r_vecs; i++) {
 419                 data = nfp_pr_et(data, "q%u_no_wait", i);
 420                 data = nfp_pr_et(data, "q%u_delayed", i);
 421         }
 422         return data;
 423 }
 424
 425 static int nfp_abm_fw_init_reset(struct nfp_abm *abm)
 426 {
 427         unsigned int i;
 428
 429         if (!abm->red_support)
 430                 return 0;
 431
 432         for (i = 0; i < abm->num_bands * NFP_NET_MAX_RX_RINGS; i++) {
 433                 __nfp_abm_ctrl_set_q_lvl(abm, i, NFP_ABM_LVL_INFINITY);
 434                 __nfp_abm_ctrl_set_q_act(abm, i, NFP_ABM_ACT_DROP);
 435         }
 436
 437         return nfp_abm_ctrl_qm_disable(abm);
 438 }
 439
 440 static int nfp_abm_init(struct nfp_app *app)
 441 {
 442         struct nfp_pf *pf = app->pf;
 443         struct nfp_reprs *reprs;
 444         struct nfp_abm *abm;
 445         int err;
 446
 447         if (!pf->eth_tbl) {
 448                 nfp_err(pf->cpp, "ABM NIC requires ETH table\n");
 449                 return -EINVAL;
 450         }
 451         if (pf->max_data_vnics != pf->eth_tbl->count) {
 452                 nfp_err(pf->cpp, "ETH entries don't match vNICs (%d vs %d)\n",
 453                         pf->max_data_vnics, pf->eth_tbl->count);
 454                 return -EINVAL;
 455         }
 456         if (!pf->mac_stats_bar) {
 457                 nfp_warn(app->cpp, "ABM NIC requires mac_stats symbol\n");
 458                 return -EINVAL;
 459         }
 460
 461         abm = kzalloc(sizeof(*abm), GFP_KERNEL);
 462         if (!abm)
 463                 return -ENOMEM;
 464         app->priv = abm;
 465         abm->app = app;
 466
 467         err = nfp_abm_ctrl_find_addrs(abm);
 468         if (err)
 469                 goto err_free_abm;
 470
 471         err = -ENOMEM;
 472         abm->num_thresholds = array_size(abm->num_bands, NFP_NET_MAX_RX_RINGS);
 473         abm->threshold_undef = bitmap_zalloc(abm->num_thresholds, GFP_KERNEL);
 474         if (!abm->threshold_undef)
 475                 goto err_free_abm;
 476
 477         abm->thresholds = kvcalloc(abm->num_thresholds,
 478                                    sizeof(*abm->thresholds), GFP_KERNEL);
 479         if (!abm->thresholds)
 480                 goto err_free_thresh_umap;
 481
 482         abm->actions = kvcalloc(abm->num_thresholds, sizeof(*abm->actions),
 483                                 GFP_KERNEL);
 484         if (!abm->actions)
 485                 goto err_free_thresh;
 486
 487         /* We start in legacy mode, make sure advanced queuing is disabled */
 488         err = nfp_abm_fw_init_reset(abm);
 489         if (err)
 490                 goto err_free_act;
 491
 492         err = -ENOMEM;
 493         reprs = nfp_reprs_alloc(pf->max_data_vnics);
 494         if (!reprs)
 495                 goto err_free_act;
 496         RCU_INIT_POINTER(app->reprs[NFP_REPR_TYPE_PHYS_PORT], reprs);
 497
 498         reprs = nfp_reprs_alloc(pf->max_data_vnics);
 499         if (!reprs)
 500                 goto err_free_phys;
 501         RCU_INIT_POINTER(app->reprs[NFP_REPR_TYPE_PF], reprs);
 502
 503         return 0;
 504
 505 err_free_phys:
 506         nfp_reprs_clean_and_free_by_type(app, NFP_REPR_TYPE_PHYS_PORT);
 507 err_free_act:
 508         kvfree(abm->actions);
 509 err_free_thresh:
 510         kvfree(abm->thresholds);
 511 err_free_thresh_umap:
 512         bitmap_free(abm->threshold_undef);
 513 err_free_abm:
 514         kfree(abm);
 515         app->priv = NULL;
 516         return err;
 517 }
 518
 519 static void nfp_abm_clean(struct nfp_app *app)
 520 {
 521         struct nfp_abm *abm = app->priv;
 522
 523         nfp_abm_eswitch_clean_up(abm);
 524         nfp_reprs_clean_and_free_by_type(app, NFP_REPR_TYPE_PF);
 525         nfp_reprs_clean_and_free_by_type(app, NFP_REPR_TYPE_PHYS_PORT);
 526         bitmap_free(abm->threshold_undef);
 527         kvfree(abm->actions);
 528         kvfree(abm->thresholds);
 529         kfree(abm);
 530         app->priv = NULL;
 531 }
 532
 533 const struct nfp_app_type app_abm = {
 534         .id             = NFP_APP_ACTIVE_BUFFER_MGMT_NIC,
 535         .name           = "abm",
 536
 537         .init           = nfp_abm_init,
 538         .clean          = nfp_abm_clean,
 539
 540         .vnic_alloc     = nfp_abm_vnic_alloc,
 541         .vnic_free      = nfp_abm_vnic_free,
 542         .vnic_init      = nfp_abm_vnic_init,
 543
 544         .port_get_stats         = nfp_abm_port_get_stats,
 545         .port_get_stats_count   = nfp_abm_port_get_stats_count,
 546         .port_get_stats_strings = nfp_abm_port_get_stats_strings,
 547
 548         .setup_tc       = nfp_abm_setup_tc,
 549
 550         .eswitch_mode_get       = nfp_abm_eswitch_mode_get,
 551         .eswitch_mode_set       = nfp_abm_eswitch_mode_set,
 552
 553         .dev_get        = nfp_abm_repr_get,
 554 };