drivers/net/netdevsim/netdev.c

   1 /*
   2  * Copyright (C) 2017 Netronome Systems, Inc.
   3  *
   4  * This software is 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.
   7  *
   8  * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
   9  * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
  10  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  11  * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
  12  * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
  13  * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
  14  */
  15
  16 #include <linux/debugfs.h>
  17 #include <linux/etherdevice.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/slab.h>
  22 #include <net/netlink.h>
  23 #include <net/pkt_cls.h>
  24 #include <net/rtnetlink.h>
  25 #include <net/udp_tunnel.h>
  26
  27 #include "netdevsim.h"
  28
  29 static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
  30 {
  31         struct netdevsim *ns = netdev_priv(dev);
  32
  33         if (!nsim_ipsec_tx(ns, skb))
  34                 goto out;
  35
  36         u64_stats_update_begin(&ns->syncp);
  37         ns->tx_packets++;
  38         ns->tx_bytes += skb->len;
  39         u64_stats_update_end(&ns->syncp);
  40
  41 out:
  42         dev_kfree_skb(skb);
  43
  44         return NETDEV_TX_OK;
  45 }
  46
  47 static void nsim_set_rx_mode(struct net_device *dev)
  48 {
  49 }
  50
  51 static int nsim_change_mtu(struct net_device *dev, int new_mtu)
  52 {
  53         struct netdevsim *ns = netdev_priv(dev);
  54
  55         if (ns->xdp.prog && new_mtu > NSIM_XDP_MAX_MTU)
  56                 return -EBUSY;
  57
  58         dev->mtu = new_mtu;
  59
  60         return 0;
  61 }
  62
  63 static void
  64 nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
  65 {
  66         struct netdevsim *ns = netdev_priv(dev);
  67         unsigned int start;
  68
  69         do {
  70                 start = u64_stats_fetch_begin(&ns->syncp);
  71                 stats->tx_bytes = ns->tx_bytes;
  72                 stats->tx_packets = ns->tx_packets;
  73         } while (u64_stats_fetch_retry(&ns->syncp, start));
  74 }
  75
  76 static int
  77 nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
  78 {
  79         return nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv);
  80 }
  81
  82 static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
  83 {
  84         struct netdevsim *ns = netdev_priv(dev);
  85         struct nsim_dev *nsim_dev = ns->nsim_dev;
  86
  87         /* Only refuse multicast addresses, zero address can mean unset/any. */
  88         if (vf >= nsim_dev_get_vfs(nsim_dev) || is_multicast_ether_addr(mac))
  89                 return -EINVAL;
  90         memcpy(nsim_dev->vfconfigs[vf].vf_mac, mac, ETH_ALEN);
  91
  92         return 0;
  93 }
  94
  95 static int nsim_set_vf_vlan(struct net_device *dev, int vf,
  96                             u16 vlan, u8 qos, __be16 vlan_proto)
  97 {
  98         struct netdevsim *ns = netdev_priv(dev);
  99         struct nsim_dev *nsim_dev = ns->nsim_dev;
 100
 101         if (vf >= nsim_dev_get_vfs(nsim_dev) || vlan > 4095 || qos > 7)
 102                 return -EINVAL;
 103
 104         nsim_dev->vfconfigs[vf].vlan = vlan;
 105         nsim_dev->vfconfigs[vf].qos = qos;
 106         nsim_dev->vfconfigs[vf].vlan_proto = vlan_proto;
 107
 108         return 0;
 109 }
 110
 111 static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max)
 112 {
 113         struct netdevsim *ns = netdev_priv(dev);
 114         struct nsim_dev *nsim_dev = ns->nsim_dev;
 115
 116         if (nsim_esw_mode_is_switchdev(ns->nsim_dev)) {
 117                 pr_err("Not supported in switchdev mode. Please use devlink API.\n");
 118                 return -EOPNOTSUPP;
 119         }
 120
 121         if (vf >= nsim_dev_get_vfs(nsim_dev))
 122                 return -EINVAL;
 123
 124         nsim_dev->vfconfigs[vf].min_tx_rate = min;
 125         nsim_dev->vfconfigs[vf].max_tx_rate = max;
 126
 127         return 0;
 128 }
 129
 130 static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
 131 {
 132         struct netdevsim *ns = netdev_priv(dev);
 133         struct nsim_dev *nsim_dev = ns->nsim_dev;
 134
 135         if (vf >= nsim_dev_get_vfs(nsim_dev))
 136                 return -EINVAL;
 137         nsim_dev->vfconfigs[vf].spoofchk_enabled = val;
 138
 139         return 0;
 140 }
 141
 142 static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
 143 {
 144         struct netdevsim *ns = netdev_priv(dev);
 145         struct nsim_dev *nsim_dev = ns->nsim_dev;
 146
 147         if (vf >= nsim_dev_get_vfs(nsim_dev))
 148                 return -EINVAL;
 149         nsim_dev->vfconfigs[vf].rss_query_enabled = val;
 150
 151         return 0;
 152 }
 153
 154 static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val)
 155 {
 156         struct netdevsim *ns = netdev_priv(dev);
 157         struct nsim_dev *nsim_dev = ns->nsim_dev;
 158
 159         if (vf >= nsim_dev_get_vfs(nsim_dev))
 160                 return -EINVAL;
 161         nsim_dev->vfconfigs[vf].trusted = val;
 162
 163         return 0;
 164 }
 165
 166 static int
 167 nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
 168 {
 169         struct netdevsim *ns = netdev_priv(dev);
 170         struct nsim_dev *nsim_dev = ns->nsim_dev;
 171
 172         if (vf >= nsim_dev_get_vfs(nsim_dev))
 173                 return -EINVAL;
 174
 175         ivi->vf = vf;
 176         ivi->linkstate = nsim_dev->vfconfigs[vf].link_state;
 177         ivi->min_tx_rate = nsim_dev->vfconfigs[vf].min_tx_rate;
 178         ivi->max_tx_rate = nsim_dev->vfconfigs[vf].max_tx_rate;
 179         ivi->vlan = nsim_dev->vfconfigs[vf].vlan;
 180         ivi->vlan_proto = nsim_dev->vfconfigs[vf].vlan_proto;
 181         ivi->qos = nsim_dev->vfconfigs[vf].qos;
 182         memcpy(&ivi->mac, nsim_dev->vfconfigs[vf].vf_mac, ETH_ALEN);
 183         ivi->spoofchk = nsim_dev->vfconfigs[vf].spoofchk_enabled;
 184         ivi->trusted = nsim_dev->vfconfigs[vf].trusted;
 185         ivi->rss_query_en = nsim_dev->vfconfigs[vf].rss_query_enabled;
 186
 187         return 0;
 188 }
 189
 190 static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
 191 {
 192         struct netdevsim *ns = netdev_priv(dev);
 193         struct nsim_dev *nsim_dev = ns->nsim_dev;
 194
 195         if (vf >= nsim_dev_get_vfs(nsim_dev))
 196                 return -EINVAL;
 197
 198         switch (state) {
 199         case IFLA_VF_LINK_STATE_AUTO:
 200         case IFLA_VF_LINK_STATE_ENABLE:
 201         case IFLA_VF_LINK_STATE_DISABLE:
 202                 break;
 203         default:
 204                 return -EINVAL;
 205         }
 206
 207         nsim_dev->vfconfigs[vf].link_state = state;
 208
 209         return 0;
 210 }
 211
 212 static LIST_HEAD(nsim_block_cb_list);
 213
 214 static int
 215 nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
 216 {
 217         struct netdevsim *ns = netdev_priv(dev);
 218
 219         switch (type) {
 220         case TC_SETUP_BLOCK:
 221                 return flow_block_cb_setup_simple(type_data,
 222                                                   &nsim_block_cb_list,
 223                                                   nsim_setup_tc_block_cb,
 224                                                   ns, ns, true);
 225         default:
 226                 return -EOPNOTSUPP;
 227         }
 228 }
 229
 230 static int
 231 nsim_set_features(struct net_device *dev, netdev_features_t features)
 232 {
 233         struct netdevsim *ns = netdev_priv(dev);
 234
 235         if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC))
 236                 return nsim_bpf_disable_tc(ns);
 237
 238         return 0;
 239 }
 240
 241 static const struct net_device_ops nsim_netdev_ops = {
 242         .ndo_start_xmit         = nsim_start_xmit,
 243         .ndo_set_rx_mode        = nsim_set_rx_mode,
 244         .ndo_set_mac_address    = eth_mac_addr,
 245         .ndo_validate_addr      = eth_validate_addr,
 246         .ndo_change_mtu         = nsim_change_mtu,
 247         .ndo_get_stats64        = nsim_get_stats64,
 248         .ndo_set_vf_mac         = nsim_set_vf_mac,
 249         .ndo_set_vf_vlan        = nsim_set_vf_vlan,
 250         .ndo_set_vf_rate        = nsim_set_vf_rate,
 251         .ndo_set_vf_spoofchk    = nsim_set_vf_spoofchk,
 252         .ndo_set_vf_trust       = nsim_set_vf_trust,
 253         .ndo_get_vf_config      = nsim_get_vf_config,
 254         .ndo_set_vf_link_state  = nsim_set_vf_link_state,
 255         .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
 256         .ndo_setup_tc           = nsim_setup_tc,
 257         .ndo_set_features       = nsim_set_features,
 258         .ndo_bpf                = nsim_bpf,
 259 };
 260
 261 static const struct net_device_ops nsim_vf_netdev_ops = {
 262         .ndo_start_xmit         = nsim_start_xmit,
 263         .ndo_set_rx_mode        = nsim_set_rx_mode,
 264         .ndo_set_mac_address    = eth_mac_addr,
 265         .ndo_validate_addr      = eth_validate_addr,
 266         .ndo_change_mtu         = nsim_change_mtu,
 267         .ndo_get_stats64        = nsim_get_stats64,
 268         .ndo_setup_tc           = nsim_setup_tc,
 269         .ndo_set_features       = nsim_set_features,
 270 };
 271
 272 static void nsim_setup(struct net_device *dev)
 273 {
 274         ether_setup(dev);
 275         eth_hw_addr_random(dev);
 276
 277         dev->tx_queue_len = 0;
 278         dev->flags |= IFF_NOARP;
 279         dev->flags &= ~IFF_MULTICAST;
 280         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
 281                            IFF_NO_QUEUE;
 282         dev->features |= NETIF_F_HIGHDMA |
 283                          NETIF_F_SG |
 284                          NETIF_F_FRAGLIST |
 285                          NETIF_F_HW_CSUM |
 286                          NETIF_F_TSO;
 287         dev->hw_features |= NETIF_F_HW_TC;
 288         dev->max_mtu = ETH_MAX_MTU;
 289         dev->xdp_features = NETDEV_XDP_ACT_HW_OFFLOAD;
 290 }
 291
 292 static int nsim_init_netdevsim(struct netdevsim *ns)
 293 {
 294         int err;
 295
 296         ns->netdev->netdev_ops = &nsim_netdev_ops;
 297
 298         err = nsim_udp_tunnels_info_create(ns->nsim_dev, ns->netdev);
 299         if (err)
 300                 return err;
 301
 302         rtnl_lock();
 303         err = nsim_bpf_init(ns);
 304         if (err)
 305                 goto err_utn_destroy;
 306
 307         nsim_ipsec_init(ns);
 308
 309         err = register_netdevice(ns->netdev);
 310         if (err)
 311                 goto err_ipsec_teardown;
 312         rtnl_unlock();
 313         return 0;
 314
 315 err_ipsec_teardown:
 316         nsim_ipsec_teardown(ns);
 317         nsim_bpf_uninit(ns);
 318 err_utn_destroy:
 319         rtnl_unlock();
 320         nsim_udp_tunnels_info_destroy(ns->netdev);
 321         return err;
 322 }
 323
 324 static int nsim_init_netdevsim_vf(struct netdevsim *ns)
 325 {
 326         int err;
 327
 328         ns->netdev->netdev_ops = &nsim_vf_netdev_ops;
 329         rtnl_lock();
 330         err = register_netdevice(ns->netdev);
 331         rtnl_unlock();
 332         return err;
 333 }
 334
 335 struct netdevsim *
 336 nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
 337 {
 338         struct net_device *dev;
 339         struct netdevsim *ns;
 340         int err;
 341
 342         dev = alloc_netdev_mq(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup,
 343                               nsim_dev->nsim_bus_dev->num_queues);
 344         if (!dev)
 345                 return ERR_PTR(-ENOMEM);
 346
 347         dev_net_set(dev, nsim_dev_net(nsim_dev));
 348         ns = netdev_priv(dev);
 349         ns->netdev = dev;
 350         u64_stats_init(&ns->syncp);
 351         ns->nsim_dev = nsim_dev;
 352         ns->nsim_dev_port = nsim_dev_port;
 353         ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
 354         SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
 355         SET_NETDEV_DEVLINK_PORT(dev, &nsim_dev_port->devlink_port);
 356         nsim_ethtool_init(ns);
 357         if (nsim_dev_port_is_pf(nsim_dev_port))
 358                 err = nsim_init_netdevsim(ns);
 359         else
 360                 err = nsim_init_netdevsim_vf(ns);
 361         if (err)
 362                 goto err_free_netdev;
 363         return ns;
 364
 365 err_free_netdev:
 366         free_netdev(dev);
 367         return ERR_PTR(err);
 368 }
 369
 370 void nsim_destroy(struct netdevsim *ns)
 371 {
 372         struct net_device *dev = ns->netdev;
 373
 374         rtnl_lock();
 375         unregister_netdevice(dev);
 376         if (nsim_dev_port_is_pf(ns->nsim_dev_port)) {
 377                 nsim_ipsec_teardown(ns);
 378                 nsim_bpf_uninit(ns);
 379         }
 380         rtnl_unlock();
 381         if (nsim_dev_port_is_pf(ns->nsim_dev_port))
 382                 nsim_udp_tunnels_info_destroy(dev);
 383         free_netdev(dev);
 384 }
 385
 386 static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
 387                          struct netlink_ext_ack *extack)
 388 {
 389         NL_SET_ERR_MSG_MOD(extack,
 390                            "Please use: echo \"[ID] [PORT_COUNT] [NUM_QUEUES]\" > /sys/bus/netdevsim/new_device");
 391         return -EOPNOTSUPP;
 392 }
 393
 394 static struct rtnl_link_ops nsim_link_ops __read_mostly = {
 395         .kind           = DRV_NAME,
 396         .validate       = nsim_validate,
 397 };
 398
 399 static int __init nsim_module_init(void)
 400 {
 401         int err;
 402
 403         err = nsim_dev_init();
 404         if (err)
 405                 return err;
 406
 407         err = nsim_bus_init();
 408         if (err)
 409                 goto err_dev_exit;
 410
 411         err = rtnl_link_register(&nsim_link_ops);
 412         if (err)
 413                 goto err_bus_exit;
 414
 415         return 0;
 416
 417 err_bus_exit:
 418         nsim_bus_exit();
 419 err_dev_exit:
 420         nsim_dev_exit();
 421         return err;
 422 }
 423
 424 static void __exit nsim_module_exit(void)
 425 {
 426         rtnl_link_unregister(&nsim_link_ops);
 427         nsim_bus_exit();
 428         nsim_dev_exit();
 429 }
 430
 431 module_init(nsim_module_init);
 432 module_exit(nsim_module_exit);
 433 MODULE_LICENSE("GPL");
 434 MODULE_ALIAS_RTNL_LINK(DRV_NAME);