drivers/net/ethernet/netronome/nfp/nfp_net_repr.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
   3
   4 #include <linux/etherdevice.h>
   5 #include <linux/io-64-nonatomic-hi-lo.h>
   6 #include <linux/lockdep.h>
   7 #include <net/dst_metadata.h>
   8
   9 #include "nfpcore/nfp_cpp.h"
  10 #include "nfpcore/nfp_nsp.h"
  11 #include "nfp_app.h"
  12 #include "nfp_main.h"
  13 #include "nfp_net.h"
  14 #include "nfp_net_ctrl.h"
  15 #include "nfp_net_repr.h"
  16 #include "nfp_net_sriov.h"
  17 #include "nfp_port.h"
  18
  19 struct net_device *
  20 nfp_repr_get_locked(struct nfp_app *app, struct nfp_reprs *set, unsigned int id)
  21 {
  22         return rcu_dereference_protected(set->reprs[id],
  23                                          nfp_app_is_locked(app));
  24 }
  25
  26 static void
  27 nfp_repr_inc_tx_stats(struct net_device *netdev, unsigned int len,
  28                       int tx_status)
  29 {
  30         struct nfp_repr *repr = netdev_priv(netdev);
  31         struct nfp_repr_pcpu_stats *stats;
  32
  33         if (unlikely(tx_status != NET_XMIT_SUCCESS &&
  34                      tx_status != NET_XMIT_CN)) {
  35                 this_cpu_inc(repr->stats->tx_drops);
  36                 return;
  37         }
  38
  39         stats = this_cpu_ptr(repr->stats);
  40         u64_stats_update_begin(&stats->syncp);
  41         stats->tx_packets++;
  42         stats->tx_bytes += len;
  43         u64_stats_update_end(&stats->syncp);
  44 }
  45
  46 void nfp_repr_inc_rx_stats(struct net_device *netdev, unsigned int len)
  47 {
  48         struct nfp_repr *repr = netdev_priv(netdev);
  49         struct nfp_repr_pcpu_stats *stats;
  50
  51         stats = this_cpu_ptr(repr->stats);
  52         u64_stats_update_begin(&stats->syncp);
  53         stats->rx_packets++;
  54         stats->rx_bytes += len;
  55         u64_stats_update_end(&stats->syncp);
  56 }
  57
  58 static void
  59 nfp_repr_phy_port_get_stats64(struct nfp_port *port,
  60                               struct rtnl_link_stats64 *stats)
  61 {
  62         u8 __iomem *mem = port->eth_stats;
  63
  64         stats->tx_packets = readq(mem + NFP_MAC_STATS_TX_FRAMES_TRANSMITTED_OK);
  65         stats->tx_bytes = readq(mem + NFP_MAC_STATS_TX_OUT_OCTETS);
  66         stats->tx_dropped = readq(mem + NFP_MAC_STATS_TX_OUT_ERRORS);
  67
  68         stats->rx_packets = readq(mem + NFP_MAC_STATS_RX_FRAMES_RECEIVED_OK);
  69         stats->rx_bytes = readq(mem + NFP_MAC_STATS_RX_IN_OCTETS);
  70         stats->rx_dropped = readq(mem + NFP_MAC_STATS_RX_IN_ERRORS);
  71 }
  72
  73 static void
  74 nfp_repr_vnic_get_stats64(struct nfp_port *port,
  75                           struct rtnl_link_stats64 *stats)
  76 {
  77         /* TX and RX stats are flipped as we are returning the stats as seen
  78          * at the switch port corresponding to the VF.
  79          */
  80         stats->tx_packets = readq(port->vnic + NFP_NET_CFG_STATS_RX_FRAMES);
  81         stats->tx_bytes = readq(port->vnic + NFP_NET_CFG_STATS_RX_OCTETS);
  82         stats->tx_dropped = readq(port->vnic + NFP_NET_CFG_STATS_RX_DISCARDS);
  83
  84         stats->rx_packets = readq(port->vnic + NFP_NET_CFG_STATS_TX_FRAMES);
  85         stats->rx_bytes = readq(port->vnic + NFP_NET_CFG_STATS_TX_OCTETS);
  86         stats->rx_dropped = readq(port->vnic + NFP_NET_CFG_STATS_TX_DISCARDS);
  87 }
  88
  89 static void
  90 nfp_repr_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
  91 {
  92         struct nfp_repr *repr = netdev_priv(netdev);
  93
  94         if (WARN_ON(!repr->port))
  95                 return;
  96
  97         switch (repr->port->type) {
  98         case NFP_PORT_PHYS_PORT:
  99                 if (!__nfp_port_get_eth_port(repr->port))
 100                         break;
 101                 nfp_repr_phy_port_get_stats64(repr->port, stats);
 102                 break;
 103         case NFP_PORT_PF_PORT:
 104         case NFP_PORT_VF_PORT:
 105                 nfp_repr_vnic_get_stats64(repr->port, stats);
 106                 break;
 107         default:
 108                 break;
 109         }
 110 }
 111
 112 static bool
 113 nfp_repr_has_offload_stats(const struct net_device *dev, int attr_id)
 114 {
 115         switch (attr_id) {
 116         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
 117                 return true;
 118         }
 119
 120         return false;
 121 }
 122
 123 static int
 124 nfp_repr_get_host_stats64(const struct net_device *netdev,
 125                           struct rtnl_link_stats64 *stats)
 126 {
 127         struct nfp_repr *repr = netdev_priv(netdev);
 128         int i;
 129
 130         for_each_possible_cpu(i) {
 131                 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
 132                 struct nfp_repr_pcpu_stats *repr_stats;
 133                 unsigned int start;
 134
 135                 repr_stats = per_cpu_ptr(repr->stats, i);
 136                 do {
 137                         start = u64_stats_fetch_begin(&repr_stats->syncp);
 138                         tbytes = repr_stats->tx_bytes;
 139                         tpkts = repr_stats->tx_packets;
 140                         tdrops = repr_stats->tx_drops;
 141                         rbytes = repr_stats->rx_bytes;
 142                         rpkts = repr_stats->rx_packets;
 143                 } while (u64_stats_fetch_retry(&repr_stats->syncp, start));
 144
 145                 stats->tx_bytes += tbytes;
 146                 stats->tx_packets += tpkts;
 147                 stats->tx_dropped += tdrops;
 148                 stats->rx_bytes += rbytes;
 149                 stats->rx_packets += rpkts;
 150         }
 151
 152         return 0;
 153 }
 154
 155 static int
 156 nfp_repr_get_offload_stats(int attr_id, const struct net_device *dev,
 157                            void *stats)
 158 {
 159         switch (attr_id) {
 160         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
 161                 return nfp_repr_get_host_stats64(dev, stats);
 162         }
 163
 164         return -EINVAL;
 165 }
 166
 167 static int nfp_repr_change_mtu(struct net_device *netdev, int new_mtu)
 168 {
 169         struct nfp_repr *repr = netdev_priv(netdev);
 170         int err;
 171
 172         err = nfp_app_check_mtu(repr->app, netdev, new_mtu);
 173         if (err)
 174                 return err;
 175
 176         err = nfp_app_repr_change_mtu(repr->app, netdev, new_mtu);
 177         if (err)
 178                 return err;
 179
 180         WRITE_ONCE(netdev->mtu, new_mtu);
 181
 182         return 0;
 183 }
 184
 185 static netdev_tx_t nfp_repr_xmit(struct sk_buff *skb, struct net_device *netdev)
 186 {
 187         struct nfp_repr *repr = netdev_priv(netdev);
 188         unsigned int len = skb->len;
 189         int ret;
 190
 191         skb_dst_drop(skb);
 192         dst_hold((struct dst_entry *)repr->dst);
 193         skb_dst_set(skb, (struct dst_entry *)repr->dst);
 194         skb->dev = repr->dst->u.port_info.lower_dev;
 195
 196         ret = dev_queue_xmit(skb);
 197         nfp_repr_inc_tx_stats(netdev, len, ret);
 198
 199         return NETDEV_TX_OK;
 200 }
 201
 202 static int nfp_repr_stop(struct net_device *netdev)
 203 {
 204         struct nfp_repr *repr = netdev_priv(netdev);
 205         int err;
 206
 207         err = nfp_app_repr_stop(repr->app, repr);
 208         if (err)
 209                 return err;
 210
 211         nfp_port_configure(netdev, false);
 212         return 0;
 213 }
 214
 215 static int nfp_repr_open(struct net_device *netdev)
 216 {
 217         struct nfp_repr *repr = netdev_priv(netdev);
 218         int err;
 219
 220         err = nfp_port_configure(netdev, true);
 221         if (err)
 222                 return err;
 223
 224         err = nfp_app_repr_open(repr->app, repr);
 225         if (err)
 226                 goto err_port_disable;
 227
 228         return 0;
 229
 230 err_port_disable:
 231         nfp_port_configure(netdev, false);
 232         return err;
 233 }
 234
 235 static netdev_features_t
 236 nfp_repr_fix_features(struct net_device *netdev, netdev_features_t features)
 237 {
 238         struct nfp_repr *repr = netdev_priv(netdev);
 239         netdev_features_t old_features = features;
 240         netdev_features_t lower_features;
 241         struct net_device *lower_dev;
 242
 243         lower_dev = repr->dst->u.port_info.lower_dev;
 244
 245         lower_features = lower_dev->features;
 246         if (lower_features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))
 247                 lower_features |= NETIF_F_HW_CSUM;
 248
 249         features = netdev_intersect_features(features, lower_features);
 250         features |= old_features & (NETIF_F_SOFT_FEATURES | NETIF_F_HW_TC);
 251
 252         return features;
 253 }
 254
 255 const struct net_device_ops nfp_repr_netdev_ops = {
 256         .ndo_init               = nfp_app_ndo_init,
 257         .ndo_uninit             = nfp_app_ndo_uninit,
 258         .ndo_open               = nfp_repr_open,
 259         .ndo_stop               = nfp_repr_stop,
 260         .ndo_start_xmit         = nfp_repr_xmit,
 261         .ndo_change_mtu         = nfp_repr_change_mtu,
 262         .ndo_get_stats64        = nfp_repr_get_stats64,
 263         .ndo_has_offload_stats  = nfp_repr_has_offload_stats,
 264         .ndo_get_offload_stats  = nfp_repr_get_offload_stats,
 265         .ndo_get_phys_port_name = nfp_port_get_phys_port_name,
 266         .ndo_setup_tc           = nfp_port_setup_tc,
 267         .ndo_set_vf_mac         = nfp_app_set_vf_mac,
 268         .ndo_set_vf_vlan        = nfp_app_set_vf_vlan,
 269         .ndo_set_vf_spoofchk    = nfp_app_set_vf_spoofchk,
 270         .ndo_set_vf_trust       = nfp_app_set_vf_trust,
 271         .ndo_get_vf_config      = nfp_app_get_vf_config,
 272         .ndo_set_vf_link_state  = nfp_app_set_vf_link_state,
 273         .ndo_fix_features       = nfp_repr_fix_features,
 274         .ndo_set_features       = nfp_port_set_features,
 275         .ndo_set_mac_address    = eth_mac_addr,
 276         .ndo_get_port_parent_id = nfp_port_get_port_parent_id,
 277 };
 278
 279 void
 280 nfp_repr_transfer_features(struct net_device *netdev, struct net_device *lower)
 281 {
 282         struct nfp_repr *repr = netdev_priv(netdev);
 283
 284         if (repr->dst->u.port_info.lower_dev != lower)
 285                 return;
 286
 287         netif_inherit_tso_max(netdev, lower);
 288
 289         netdev_update_features(netdev);
 290 }
 291
 292 static void nfp_repr_clean(struct nfp_repr *repr)
 293 {
 294         unregister_netdev(repr->netdev);
 295         nfp_app_repr_clean(repr->app, repr->netdev);
 296         dst_release((struct dst_entry *)repr->dst);
 297         nfp_port_free(repr->port);
 298 }
 299
 300 static struct lock_class_key nfp_repr_netdev_xmit_lock_key;
 301
 302 static void nfp_repr_set_lockdep_class_one(struct net_device *dev,
 303                                            struct netdev_queue *txq,
 304                                            void *_unused)
 305 {
 306         lockdep_set_class(&txq->_xmit_lock, &nfp_repr_netdev_xmit_lock_key);
 307 }
 308
 309 static void nfp_repr_set_lockdep_class(struct net_device *dev)
 310 {
 311         netdev_for_each_tx_queue(dev, nfp_repr_set_lockdep_class_one, NULL);
 312 }
 313
 314 int nfp_repr_init(struct nfp_app *app, struct net_device *netdev,
 315                   u32 cmsg_port_id, struct nfp_port *port,
 316                   struct net_device *pf_netdev)
 317 {
 318         struct nfp_repr *repr = netdev_priv(netdev);
 319         struct nfp_net *nn = netdev_priv(pf_netdev);
 320         u32 repr_cap = nn->tlv_caps.repr_cap;
 321         int err;
 322
 323         nfp_repr_set_lockdep_class(netdev);
 324
 325         repr->port = port;
 326         repr->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, GFP_KERNEL);
 327         if (!repr->dst)
 328                 return -ENOMEM;
 329         repr->dst->u.port_info.port_id = cmsg_port_id;
 330         repr->dst->u.port_info.lower_dev = pf_netdev;
 331
 332         netdev->netdev_ops = &nfp_repr_netdev_ops;
 333         netdev->ethtool_ops = &nfp_port_ethtool_ops;
 334
 335         netdev->max_mtu = pf_netdev->max_mtu;
 336
 337         /* Set features the lower device can support with representors */
 338         if (repr_cap & NFP_NET_CFG_CTRL_LIVE_ADDR)
 339                 netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 340
 341         netdev->hw_features = NETIF_F_HIGHDMA;
 342         if (repr_cap & NFP_NET_CFG_CTRL_RXCSUM_ANY)
 343                 netdev->hw_features |= NETIF_F_RXCSUM;
 344         if (repr_cap & NFP_NET_CFG_CTRL_TXCSUM)
 345                 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
 346         if (repr_cap & NFP_NET_CFG_CTRL_GATHER)
 347                 netdev->hw_features |= NETIF_F_SG;
 348         if ((repr_cap & NFP_NET_CFG_CTRL_LSO && nn->fw_ver.major > 2) ||
 349             repr_cap & NFP_NET_CFG_CTRL_LSO2)
 350                 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
 351         if (repr_cap & NFP_NET_CFG_CTRL_RSS_ANY)
 352                 netdev->hw_features |= NETIF_F_RXHASH;
 353         if (repr_cap & NFP_NET_CFG_CTRL_VXLAN) {
 354                 if (repr_cap & NFP_NET_CFG_CTRL_LSO)
 355                         netdev->hw_features |= NETIF_F_GSO_UDP_TUNNEL;
 356         }
 357         if (repr_cap & NFP_NET_CFG_CTRL_NVGRE) {
 358                 if (repr_cap & NFP_NET_CFG_CTRL_LSO)
 359                         netdev->hw_features |= NETIF_F_GSO_GRE;
 360         }
 361         if (repr_cap & (NFP_NET_CFG_CTRL_VXLAN | NFP_NET_CFG_CTRL_NVGRE))
 362                 netdev->hw_enc_features = netdev->hw_features;
 363
 364         netdev->vlan_features = netdev->hw_features;
 365
 366         if (repr_cap & NFP_NET_CFG_CTRL_RXVLAN_ANY)
 367                 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
 368         if (repr_cap & NFP_NET_CFG_CTRL_TXVLAN_ANY) {
 369                 if (repr_cap & NFP_NET_CFG_CTRL_LSO2)
 370                         netdev_warn(netdev, "Device advertises both TSO2 and TXVLAN. Refusing to enable TXVLAN.\n");
 371                 else
 372                         netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_TX;
 373         }
 374         if (repr_cap & NFP_NET_CFG_CTRL_CTAG_FILTER)
 375                 netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_FILTER;
 376         if (repr_cap & NFP_NET_CFG_CTRL_RXQINQ)
 377                 netdev->hw_features |= NETIF_F_HW_VLAN_STAG_RX;
 378
 379         netdev->features = netdev->hw_features;
 380
 381         /* C-Tag strip and S-Tag strip can't be supported simultaneously,
 382          * so enable C-Tag strip and disable S-Tag strip by default.
 383          */
 384         netdev->features &= ~NETIF_F_HW_VLAN_STAG_RX;
 385         netif_set_tso_max_segs(netdev, NFP_NET_LSO_MAX_SEGS);
 386
 387         netdev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
 388         netdev->lltx = true;
 389
 390         if (nfp_app_has_tc(app)) {
 391                 netdev->features |= NETIF_F_HW_TC;
 392                 netdev->hw_features |= NETIF_F_HW_TC;
 393         }
 394
 395         err = nfp_app_repr_init(app, netdev);
 396         if (err)
 397                 goto err_clean;
 398
 399         err = register_netdev(netdev);
 400         if (err)
 401                 goto err_repr_clean;
 402
 403         return 0;
 404
 405 err_repr_clean:
 406         nfp_app_repr_clean(app, netdev);
 407 err_clean:
 408         dst_release((struct dst_entry *)repr->dst);
 409         return err;
 410 }
 411
 412 static void __nfp_repr_free(struct nfp_repr *repr)
 413 {
 414         free_percpu(repr->stats);
 415         free_netdev(repr->netdev);
 416 }
 417
 418 void nfp_repr_free(struct net_device *netdev)
 419 {
 420         __nfp_repr_free(netdev_priv(netdev));
 421 }
 422
 423 struct net_device *
 424 nfp_repr_alloc_mqs(struct nfp_app *app, unsigned int txqs, unsigned int rxqs)
 425 {
 426         struct net_device *netdev;
 427         struct nfp_repr *repr;
 428
 429         netdev = alloc_etherdev_mqs(sizeof(*repr), txqs, rxqs);
 430         if (!netdev)
 431                 return NULL;
 432
 433         netif_carrier_off(netdev);
 434
 435         repr = netdev_priv(netdev);
 436         repr->netdev = netdev;
 437         repr->app = app;
 438
 439         repr->stats = netdev_alloc_pcpu_stats(struct nfp_repr_pcpu_stats);
 440         if (!repr->stats)
 441                 goto err_free_netdev;
 442
 443         return netdev;
 444
 445 err_free_netdev:
 446         free_netdev(netdev);
 447         return NULL;
 448 }
 449
 450 void nfp_repr_clean_and_free(struct nfp_repr *repr)
 451 {
 452         nfp_info(repr->app->cpp, "Destroying Representor(%s)\n",
 453                  repr->netdev->name);
 454         nfp_repr_clean(repr);
 455         __nfp_repr_free(repr);
 456 }
 457
 458 void nfp_reprs_clean_and_free(struct nfp_app *app, struct nfp_reprs *reprs)
 459 {
 460         struct net_device *netdev;
 461         unsigned int i;
 462
 463         for (i = 0; i < reprs->num_reprs; i++) {
 464                 netdev = nfp_repr_get_locked(app, reprs, i);
 465                 if (netdev)
 466                         nfp_repr_clean_and_free(netdev_priv(netdev));
 467         }
 468
 469         kfree(reprs);
 470 }
 471
 472 void
 473 nfp_reprs_clean_and_free_by_type(struct nfp_app *app, enum nfp_repr_type type)
 474 {
 475         struct net_device *netdev;
 476         struct nfp_reprs *reprs;
 477         int i;
 478
 479         reprs = rcu_dereference_protected(app->reprs[type],
 480                                           nfp_app_is_locked(app));
 481         if (!reprs)
 482                 return;
 483
 484         /* Preclean must happen before we remove the reprs reference from the
 485          * app below.
 486          */
 487         for (i = 0; i < reprs->num_reprs; i++) {
 488                 netdev = nfp_repr_get_locked(app, reprs, i);
 489                 if (netdev)
 490                         nfp_app_repr_preclean(app, netdev);
 491         }
 492
 493         reprs = nfp_app_reprs_set(app, type, NULL);
 494
 495         synchronize_rcu();
 496         nfp_reprs_clean_and_free(app, reprs);
 497 }
 498
 499 struct nfp_reprs *nfp_reprs_alloc(unsigned int num_reprs)
 500 {
 501         struct nfp_reprs *reprs;
 502
 503         reprs = kzalloc(struct_size(reprs, reprs, num_reprs), GFP_KERNEL);
 504         if (!reprs)
 505                 return NULL;
 506         reprs->num_reprs = num_reprs;
 507
 508         return reprs;
 509 }
 510
 511 int nfp_reprs_resync_phys_ports(struct nfp_app *app)
 512 {
 513         struct net_device *netdev;
 514         struct nfp_reprs *reprs;
 515         struct nfp_repr *repr;
 516         int i;
 517
 518         reprs = nfp_reprs_get_locked(app, NFP_REPR_TYPE_PHYS_PORT);
 519         if (!reprs)
 520                 return 0;
 521
 522         for (i = 0; i < reprs->num_reprs; i++) {
 523                 netdev = nfp_repr_get_locked(app, reprs, i);
 524                 if (!netdev)
 525                         continue;
 526
 527                 repr = netdev_priv(netdev);
 528                 if (repr->port->type != NFP_PORT_INVALID)
 529                         continue;
 530
 531                 nfp_app_repr_preclean(app, netdev);
 532                 rtnl_lock();
 533                 rcu_assign_pointer(reprs->reprs[i], NULL);
 534                 rtnl_unlock();
 535                 synchronize_rcu();
 536                 nfp_repr_clean(repr);
 537         }
 538
 539         return 0;
 540 }