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

   1 /*
   2  * Copyright (C) 2017 Netronome Systems, Inc.
   3  *
   4  * This software is dual licensed under the GNU General License Version 2,
   5  * June 1991 as shown in the file COPYING in the top-level directory of this
   6  * source tree or the BSD 2-Clause License provided below.  You have the
   7  * option to license this software under the complete terms of either license.
   8  *
   9  * The BSD 2-Clause License:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      1. Redistributions of source code must retain the above
  16  *         copyright notice, this list of conditions and the following
  17  *         disclaimer.
  18  *
  19  *      2. Redistributions in binary form must reproduce the above
  20  *         copyright notice, this list of conditions and the following
  21  *         disclaimer in the documentation and/or other materials
  22  *         provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include <linux/etherdevice.h>
  35 #include <linux/io-64-nonatomic-hi-lo.h>
  36 #include <linux/lockdep.h>
  37 #include <net/dst_metadata.h>
  38 #include <net/switchdev.h>
  39
  40 #include "nfpcore/nfp_cpp.h"
  41 #include "nfpcore/nfp_nsp.h"
  42 #include "nfp_app.h"
  43 #include "nfp_main.h"
  44 #include "nfp_net_ctrl.h"
  45 #include "nfp_net_repr.h"
  46 #include "nfp_net_sriov.h"
  47 #include "nfp_port.h"
  48
  49 struct net_device *
  50 nfp_repr_get_locked(struct nfp_app *app, struct nfp_reprs *set, unsigned int id)
  51 {
  52         return rcu_dereference_protected(set->reprs[id],
  53                                          lockdep_is_held(&app->pf->lock));
  54 }
  55
  56 static void
  57 nfp_repr_inc_tx_stats(struct net_device *netdev, unsigned int len,
  58                       int tx_status)
  59 {
  60         struct nfp_repr *repr = netdev_priv(netdev);
  61         struct nfp_repr_pcpu_stats *stats;
  62
  63         if (unlikely(tx_status != NET_XMIT_SUCCESS &&
  64                      tx_status != NET_XMIT_CN)) {
  65                 this_cpu_inc(repr->stats->tx_drops);
  66                 return;
  67         }
  68
  69         stats = this_cpu_ptr(repr->stats);
  70         u64_stats_update_begin(&stats->syncp);
  71         stats->tx_packets++;
  72         stats->tx_bytes += len;
  73         u64_stats_update_end(&stats->syncp);
  74 }
  75
  76 void nfp_repr_inc_rx_stats(struct net_device *netdev, unsigned int len)
  77 {
  78         struct nfp_repr *repr = netdev_priv(netdev);
  79         struct nfp_repr_pcpu_stats *stats;
  80
  81         stats = this_cpu_ptr(repr->stats);
  82         u64_stats_update_begin(&stats->syncp);
  83         stats->rx_packets++;
  84         stats->rx_bytes += len;
  85         u64_stats_update_end(&stats->syncp);
  86 }
  87
  88 static void
  89 nfp_repr_phy_port_get_stats64(struct nfp_port *port,
  90                               struct rtnl_link_stats64 *stats)
  91 {
  92         u8 __iomem *mem = port->eth_stats;
  93
  94         stats->tx_packets = readq(mem + NFP_MAC_STATS_TX_FRAMES_TRANSMITTED_OK);
  95         stats->tx_bytes = readq(mem + NFP_MAC_STATS_TX_OUT_OCTETS);
  96         stats->tx_dropped = readq(mem + NFP_MAC_STATS_TX_OUT_ERRORS);
  97
  98         stats->rx_packets = readq(mem + NFP_MAC_STATS_RX_FRAMES_RECEIVED_OK);
  99         stats->rx_bytes = readq(mem + NFP_MAC_STATS_RX_IN_OCTETS);
 100         stats->rx_dropped = readq(mem + NFP_MAC_STATS_RX_IN_ERRORS);
 101 }
 102
 103 static void
 104 nfp_repr_vnic_get_stats64(struct nfp_port *port,
 105                           struct rtnl_link_stats64 *stats)
 106 {
 107         /* TX and RX stats are flipped as we are returning the stats as seen
 108          * at the switch port corresponding to the VF.
 109          */
 110         stats->tx_packets = readq(port->vnic + NFP_NET_CFG_STATS_RX_FRAMES);
 111         stats->tx_bytes = readq(port->vnic + NFP_NET_CFG_STATS_RX_OCTETS);
 112         stats->tx_dropped = readq(port->vnic + NFP_NET_CFG_STATS_RX_DISCARDS);
 113
 114         stats->rx_packets = readq(port->vnic + NFP_NET_CFG_STATS_TX_FRAMES);
 115         stats->rx_bytes = readq(port->vnic + NFP_NET_CFG_STATS_TX_OCTETS);
 116         stats->rx_dropped = readq(port->vnic + NFP_NET_CFG_STATS_TX_DISCARDS);
 117 }
 118
 119 static void
 120 nfp_repr_get_stats64(struct net_device *netdev, struct rtnl_link_stats64 *stats)
 121 {
 122         struct nfp_repr *repr = netdev_priv(netdev);
 123
 124         if (WARN_ON(!repr->port))
 125                 return;
 126
 127         switch (repr->port->type) {
 128         case NFP_PORT_PHYS_PORT:
 129                 if (!__nfp_port_get_eth_port(repr->port))
 130                         break;
 131                 nfp_repr_phy_port_get_stats64(repr->port, stats);
 132                 break;
 133         case NFP_PORT_PF_PORT:
 134         case NFP_PORT_VF_PORT:
 135                 nfp_repr_vnic_get_stats64(repr->port, stats);
 136         default:
 137                 break;
 138         }
 139 }
 140
 141 static bool
 142 nfp_repr_has_offload_stats(const struct net_device *dev, int attr_id)
 143 {
 144         switch (attr_id) {
 145         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
 146                 return true;
 147         }
 148
 149         return false;
 150 }
 151
 152 static int
 153 nfp_repr_get_host_stats64(const struct net_device *netdev,
 154                           struct rtnl_link_stats64 *stats)
 155 {
 156         struct nfp_repr *repr = netdev_priv(netdev);
 157         int i;
 158
 159         for_each_possible_cpu(i) {
 160                 u64 tbytes, tpkts, tdrops, rbytes, rpkts;
 161                 struct nfp_repr_pcpu_stats *repr_stats;
 162                 unsigned int start;
 163
 164                 repr_stats = per_cpu_ptr(repr->stats, i);
 165                 do {
 166                         start = u64_stats_fetch_begin_irq(&repr_stats->syncp);
 167                         tbytes = repr_stats->tx_bytes;
 168                         tpkts = repr_stats->tx_packets;
 169                         tdrops = repr_stats->tx_drops;
 170                         rbytes = repr_stats->rx_bytes;
 171                         rpkts = repr_stats->rx_packets;
 172                 } while (u64_stats_fetch_retry_irq(&repr_stats->syncp, start));
 173
 174                 stats->tx_bytes += tbytes;
 175                 stats->tx_packets += tpkts;
 176                 stats->tx_dropped += tdrops;
 177                 stats->rx_bytes += rbytes;
 178                 stats->rx_packets += rpkts;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int
 185 nfp_repr_get_offload_stats(int attr_id, const struct net_device *dev,
 186                            void *stats)
 187 {
 188         switch (attr_id) {
 189         case IFLA_OFFLOAD_XSTATS_CPU_HIT:
 190                 return nfp_repr_get_host_stats64(dev, stats);
 191         }
 192
 193         return -EINVAL;
 194 }
 195
 196 static int nfp_repr_change_mtu(struct net_device *netdev, int new_mtu)
 197 {
 198         struct nfp_repr *repr = netdev_priv(netdev);
 199
 200         return nfp_app_change_mtu(repr->app, netdev, new_mtu);
 201 }
 202
 203 static netdev_tx_t nfp_repr_xmit(struct sk_buff *skb, struct net_device *netdev)
 204 {
 205         struct nfp_repr *repr = netdev_priv(netdev);
 206         unsigned int len = skb->len;
 207         int ret;
 208
 209         skb_dst_drop(skb);
 210         dst_hold((struct dst_entry *)repr->dst);
 211         skb_dst_set(skb, (struct dst_entry *)repr->dst);
 212         skb->dev = repr->dst->u.port_info.lower_dev;
 213
 214         ret = dev_queue_xmit(skb);
 215         nfp_repr_inc_tx_stats(netdev, len, ret);
 216
 217         return ret;
 218 }
 219
 220 static int nfp_repr_stop(struct net_device *netdev)
 221 {
 222         struct nfp_repr *repr = netdev_priv(netdev);
 223         int err;
 224
 225         err = nfp_app_repr_stop(repr->app, repr);
 226         if (err)
 227                 return err;
 228
 229         nfp_port_configure(netdev, false);
 230         return 0;
 231 }
 232
 233 static int nfp_repr_open(struct net_device *netdev)
 234 {
 235         struct nfp_repr *repr = netdev_priv(netdev);
 236         int err;
 237
 238         err = nfp_port_configure(netdev, true);
 239         if (err)
 240                 return err;
 241
 242         err = nfp_app_repr_open(repr->app, repr);
 243         if (err)
 244                 goto err_port_disable;
 245
 246         return 0;
 247
 248 err_port_disable:
 249         nfp_port_configure(netdev, false);
 250         return err;
 251 }
 252
 253 const struct net_device_ops nfp_repr_netdev_ops = {
 254         .ndo_open               = nfp_repr_open,
 255         .ndo_stop               = nfp_repr_stop,
 256         .ndo_start_xmit         = nfp_repr_xmit,
 257         .ndo_change_mtu         = nfp_repr_change_mtu,
 258         .ndo_get_stats64        = nfp_repr_get_stats64,
 259         .ndo_has_offload_stats  = nfp_repr_has_offload_stats,
 260         .ndo_get_offload_stats  = nfp_repr_get_offload_stats,
 261         .ndo_get_phys_port_name = nfp_port_get_phys_port_name,
 262         .ndo_setup_tc           = nfp_port_setup_tc,
 263         .ndo_set_vf_mac         = nfp_app_set_vf_mac,
 264         .ndo_set_vf_vlan        = nfp_app_set_vf_vlan,
 265         .ndo_set_vf_spoofchk    = nfp_app_set_vf_spoofchk,
 266         .ndo_get_vf_config      = nfp_app_get_vf_config,
 267         .ndo_set_vf_link_state  = nfp_app_set_vf_link_state,
 268         .ndo_set_features       = nfp_port_set_features,
 269 };
 270
 271 static void nfp_repr_clean(struct nfp_repr *repr)
 272 {
 273         unregister_netdev(repr->netdev);
 274         nfp_app_repr_clean(repr->app, repr->netdev);
 275         dst_release((struct dst_entry *)repr->dst);
 276         nfp_port_free(repr->port);
 277 }
 278
 279 static struct lock_class_key nfp_repr_netdev_xmit_lock_key;
 280 static struct lock_class_key nfp_repr_netdev_addr_lock_key;
 281
 282 static void nfp_repr_set_lockdep_class_one(struct net_device *dev,
 283                                            struct netdev_queue *txq,
 284                                            void *_unused)
 285 {
 286         lockdep_set_class(&txq->_xmit_lock, &nfp_repr_netdev_xmit_lock_key);
 287 }
 288
 289 static void nfp_repr_set_lockdep_class(struct net_device *dev)
 290 {
 291         lockdep_set_class(&dev->addr_list_lock, &nfp_repr_netdev_addr_lock_key);
 292         netdev_for_each_tx_queue(dev, nfp_repr_set_lockdep_class_one, NULL);
 293 }
 294
 295 int nfp_repr_init(struct nfp_app *app, struct net_device *netdev,
 296                   u32 cmsg_port_id, struct nfp_port *port,
 297                   struct net_device *pf_netdev)
 298 {
 299         struct nfp_repr *repr = netdev_priv(netdev);
 300         int err;
 301
 302         nfp_repr_set_lockdep_class(netdev);
 303
 304         repr->port = port;
 305         repr->dst = metadata_dst_alloc(0, METADATA_HW_PORT_MUX, GFP_KERNEL);
 306         if (!repr->dst)
 307                 return -ENOMEM;
 308         repr->dst->u.port_info.port_id = cmsg_port_id;
 309         repr->dst->u.port_info.lower_dev = pf_netdev;
 310
 311         netdev->netdev_ops = &nfp_repr_netdev_ops;
 312         netdev->ethtool_ops = &nfp_port_ethtool_ops;
 313
 314         netdev->max_mtu = pf_netdev->max_mtu;
 315
 316         SWITCHDEV_SET_OPS(netdev, &nfp_port_switchdev_ops);
 317
 318         if (nfp_app_has_tc(app)) {
 319                 netdev->features |= NETIF_F_HW_TC;
 320                 netdev->hw_features |= NETIF_F_HW_TC;
 321         }
 322
 323         err = nfp_app_repr_init(app, netdev);
 324         if (err)
 325                 goto err_clean;
 326
 327         err = register_netdev(netdev);
 328         if (err)
 329                 goto err_repr_clean;
 330
 331         return 0;
 332
 333 err_repr_clean:
 334         nfp_app_repr_clean(app, netdev);
 335 err_clean:
 336         dst_release((struct dst_entry *)repr->dst);
 337         return err;
 338 }
 339
 340 static void nfp_repr_free(struct nfp_repr *repr)
 341 {
 342         free_percpu(repr->stats);
 343         free_netdev(repr->netdev);
 344 }
 345
 346 struct net_device *nfp_repr_alloc(struct nfp_app *app)
 347 {
 348         struct net_device *netdev;
 349         struct nfp_repr *repr;
 350
 351         netdev = alloc_etherdev(sizeof(*repr));
 352         if (!netdev)
 353                 return NULL;
 354
 355         netif_carrier_off(netdev);
 356
 357         repr = netdev_priv(netdev);
 358         repr->netdev = netdev;
 359         repr->app = app;
 360
 361         repr->stats = netdev_alloc_pcpu_stats(struct nfp_repr_pcpu_stats);
 362         if (!repr->stats)
 363                 goto err_free_netdev;
 364
 365         return netdev;
 366
 367 err_free_netdev:
 368         free_netdev(netdev);
 369         return NULL;
 370 }
 371
 372 static void nfp_repr_clean_and_free(struct nfp_repr *repr)
 373 {
 374         nfp_info(repr->app->cpp, "Destroying Representor(%s)\n",
 375                  repr->netdev->name);
 376         nfp_repr_clean(repr);
 377         nfp_repr_free(repr);
 378 }
 379
 380 void nfp_reprs_clean_and_free(struct nfp_app *app, struct nfp_reprs *reprs)
 381 {
 382         struct net_device *netdev;
 383         unsigned int i;
 384
 385         for (i = 0; i < reprs->num_reprs; i++) {
 386                 netdev = nfp_repr_get_locked(app, reprs, i);
 387                 if (netdev)
 388                         nfp_repr_clean_and_free(netdev_priv(netdev));
 389         }
 390
 391         kfree(reprs);
 392 }
 393
 394 void
 395 nfp_reprs_clean_and_free_by_type(struct nfp_app *app, enum nfp_repr_type type)
 396 {
 397         struct net_device *netdev;
 398         struct nfp_reprs *reprs;
 399         int i;
 400
 401         reprs = rcu_dereference_protected(app->reprs[type],
 402                                           lockdep_is_held(&app->pf->lock));
 403         if (!reprs)
 404                 return;
 405
 406         /* Preclean must happen before we remove the reprs reference from the
 407          * app below.
 408          */
 409         for (i = 0; i < reprs->num_reprs; i++) {
 410                 netdev = nfp_repr_get_locked(app, reprs, i);
 411                 if (netdev)
 412                         nfp_app_repr_preclean(app, netdev);
 413         }
 414
 415         reprs = nfp_app_reprs_set(app, type, NULL);
 416
 417         synchronize_rcu();
 418         nfp_reprs_clean_and_free(app, reprs);
 419 }
 420
 421 struct nfp_reprs *nfp_reprs_alloc(unsigned int num_reprs)
 422 {
 423         struct nfp_reprs *reprs;
 424
 425         reprs = kzalloc(sizeof(*reprs) +
 426                         num_reprs * sizeof(struct net_device *), GFP_KERNEL);
 427         if (!reprs)
 428                 return NULL;
 429         reprs->num_reprs = num_reprs;
 430
 431         return reprs;
 432 }
 433
 434 int nfp_reprs_resync_phys_ports(struct nfp_app *app)
 435 {
 436         struct net_device *netdev;
 437         struct nfp_reprs *reprs;
 438         struct nfp_repr *repr;
 439         int i;
 440
 441         reprs = nfp_reprs_get_locked(app, NFP_REPR_TYPE_PHYS_PORT);
 442         if (!reprs)
 443                 return 0;
 444
 445         for (i = 0; i < reprs->num_reprs; i++) {
 446                 netdev = nfp_repr_get_locked(app, reprs, i);
 447                 if (!netdev)
 448                         continue;
 449
 450                 repr = netdev_priv(netdev);
 451                 if (repr->port->type != NFP_PORT_INVALID)
 452                         continue;
 453
 454                 nfp_app_repr_preclean(app, netdev);
 455                 rcu_assign_pointer(reprs->reprs[i], NULL);
 456                 synchronize_rcu();
 457                 nfp_repr_clean(repr);
 458         }
 459
 460         return 0;
 461 }