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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
  86
  87         /* Only refuse multicast addresses, zero address can mean unset/any. */
  88         if (vf >= nsim_bus_dev->num_vfs || is_multicast_ether_addr(mac))
  89                 return -EINVAL;
  90         memcpy(nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 100
 101         if (vf >= nsim_bus_dev->num_vfs || vlan > 4095 || qos > 7)
 102                 return -EINVAL;
 103
 104         nsim_bus_dev->vfconfigs[vf].vlan = vlan;
 105         nsim_bus_dev->vfconfigs[vf].qos = qos;
 106         nsim_bus_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_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 115
 116         if (vf >= nsim_bus_dev->num_vfs)
 117                 return -EINVAL;
 118
 119         nsim_bus_dev->vfconfigs[vf].min_tx_rate = min;
 120         nsim_bus_dev->vfconfigs[vf].max_tx_rate = max;
 121
 122         return 0;
 123 }
 124
 125 static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
 126 {
 127         struct netdevsim *ns = netdev_priv(dev);
 128         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 129
 130         if (vf >= nsim_bus_dev->num_vfs)
 131                 return -EINVAL;
 132         nsim_bus_dev->vfconfigs[vf].spoofchk_enabled = val;
 133
 134         return 0;
 135 }
 136
 137 static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
 138 {
 139         struct netdevsim *ns = netdev_priv(dev);
 140         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 141
 142         if (vf >= nsim_bus_dev->num_vfs)
 143                 return -EINVAL;
 144         nsim_bus_dev->vfconfigs[vf].rss_query_enabled = val;
 145
 146         return 0;
 147 }
 148
 149 static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val)
 150 {
 151         struct netdevsim *ns = netdev_priv(dev);
 152         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 153
 154         if (vf >= nsim_bus_dev->num_vfs)
 155                 return -EINVAL;
 156         nsim_bus_dev->vfconfigs[vf].trusted = val;
 157
 158         return 0;
 159 }
 160
 161 static int
 162 nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
 163 {
 164         struct netdevsim *ns = netdev_priv(dev);
 165         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 166
 167         if (vf >= nsim_bus_dev->num_vfs)
 168                 return -EINVAL;
 169
 170         ivi->vf = vf;
 171         ivi->linkstate = nsim_bus_dev->vfconfigs[vf].link_state;
 172         ivi->min_tx_rate = nsim_bus_dev->vfconfigs[vf].min_tx_rate;
 173         ivi->max_tx_rate = nsim_bus_dev->vfconfigs[vf].max_tx_rate;
 174         ivi->vlan = nsim_bus_dev->vfconfigs[vf].vlan;
 175         ivi->vlan_proto = nsim_bus_dev->vfconfigs[vf].vlan_proto;
 176         ivi->qos = nsim_bus_dev->vfconfigs[vf].qos;
 177         memcpy(&ivi->mac, nsim_bus_dev->vfconfigs[vf].vf_mac, ETH_ALEN);
 178         ivi->spoofchk = nsim_bus_dev->vfconfigs[vf].spoofchk_enabled;
 179         ivi->trusted = nsim_bus_dev->vfconfigs[vf].trusted;
 180         ivi->rss_query_en = nsim_bus_dev->vfconfigs[vf].rss_query_enabled;
 181
 182         return 0;
 183 }
 184
 185 static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
 186 {
 187         struct netdevsim *ns = netdev_priv(dev);
 188         struct nsim_bus_dev *nsim_bus_dev = ns->nsim_bus_dev;
 189
 190         if (vf >= nsim_bus_dev->num_vfs)
 191                 return -EINVAL;
 192
 193         switch (state) {
 194         case IFLA_VF_LINK_STATE_AUTO:
 195         case IFLA_VF_LINK_STATE_ENABLE:
 196         case IFLA_VF_LINK_STATE_DISABLE:
 197                 break;
 198         default:
 199                 return -EINVAL;
 200         }
 201
 202         nsim_bus_dev->vfconfigs[vf].link_state = state;
 203
 204         return 0;
 205 }
 206
 207 static LIST_HEAD(nsim_block_cb_list);
 208
 209 static int
 210 nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
 211 {
 212         struct netdevsim *ns = netdev_priv(dev);
 213
 214         switch (type) {
 215         case TC_SETUP_BLOCK:
 216                 return flow_block_cb_setup_simple(type_data,
 217                                                   &nsim_block_cb_list,
 218                                                   nsim_setup_tc_block_cb,
 219                                                   ns, ns, true);
 220         default:
 221                 return -EOPNOTSUPP;
 222         }
 223 }
 224
 225 static int
 226 nsim_set_features(struct net_device *dev, netdev_features_t features)
 227 {
 228         struct netdevsim *ns = netdev_priv(dev);
 229
 230         if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC))
 231                 return nsim_bpf_disable_tc(ns);
 232
 233         return 0;
 234 }
 235
 236 static struct devlink_port *nsim_get_devlink_port(struct net_device *dev)
 237 {
 238         struct netdevsim *ns = netdev_priv(dev);
 239
 240         return &ns->nsim_dev_port->devlink_port;
 241 }
 242
 243 static const struct net_device_ops nsim_netdev_ops = {
 244         .ndo_start_xmit         = nsim_start_xmit,
 245         .ndo_set_rx_mode        = nsim_set_rx_mode,
 246         .ndo_set_mac_address    = eth_mac_addr,
 247         .ndo_validate_addr      = eth_validate_addr,
 248         .ndo_change_mtu         = nsim_change_mtu,
 249         .ndo_get_stats64        = nsim_get_stats64,
 250         .ndo_set_vf_mac         = nsim_set_vf_mac,
 251         .ndo_set_vf_vlan        = nsim_set_vf_vlan,
 252         .ndo_set_vf_rate        = nsim_set_vf_rate,
 253         .ndo_set_vf_spoofchk    = nsim_set_vf_spoofchk,
 254         .ndo_set_vf_trust       = nsim_set_vf_trust,
 255         .ndo_get_vf_config      = nsim_get_vf_config,
 256         .ndo_set_vf_link_state  = nsim_set_vf_link_state,
 257         .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
 258         .ndo_setup_tc           = nsim_setup_tc,
 259         .ndo_set_features       = nsim_set_features,
 260         .ndo_bpf                = nsim_bpf,
 261         .ndo_get_devlink_port   = nsim_get_devlink_port,
 262 };
 263
 264 static void nsim_setup(struct net_device *dev)
 265 {
 266         ether_setup(dev);
 267         eth_hw_addr_random(dev);
 268
 269         dev->tx_queue_len = 0;
 270         dev->flags |= IFF_NOARP;
 271         dev->flags &= ~IFF_MULTICAST;
 272         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
 273                            IFF_NO_QUEUE;
 274         dev->features |= NETIF_F_HIGHDMA |
 275                          NETIF_F_SG |
 276                          NETIF_F_FRAGLIST |
 277                          NETIF_F_HW_CSUM |
 278                          NETIF_F_TSO;
 279         dev->hw_features |= NETIF_F_HW_TC;
 280         dev->max_mtu = ETH_MAX_MTU;
 281 }
 282
 283 struct netdevsim *
 284 nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
 285 {
 286         struct net_device *dev;
 287         struct netdevsim *ns;
 288         int err;
 289
 290         dev = alloc_netdev(sizeof(*ns), "eth%d", NET_NAME_UNKNOWN, nsim_setup);
 291         if (!dev)
 292                 return ERR_PTR(-ENOMEM);
 293
 294         dev_net_set(dev, nsim_dev_net(nsim_dev));
 295         ns = netdev_priv(dev);
 296         ns->netdev = dev;
 297         u64_stats_init(&ns->syncp);
 298         ns->nsim_dev = nsim_dev;
 299         ns->nsim_dev_port = nsim_dev_port;
 300         ns->nsim_bus_dev = nsim_dev->nsim_bus_dev;
 301         SET_NETDEV_DEV(dev, &ns->nsim_bus_dev->dev);
 302         dev->netdev_ops = &nsim_netdev_ops;
 303         nsim_ethtool_init(ns);
 304
 305         err = nsim_udp_tunnels_info_create(nsim_dev, dev);
 306         if (err)
 307                 goto err_free_netdev;
 308
 309         rtnl_lock();
 310         err = nsim_bpf_init(ns);
 311         if (err)
 312                 goto err_utn_destroy;
 313
 314         nsim_ipsec_init(ns);
 315
 316         err = register_netdevice(dev);
 317         if (err)
 318                 goto err_ipsec_teardown;
 319         rtnl_unlock();
 320
 321         return ns;
 322
 323 err_ipsec_teardown:
 324         nsim_ipsec_teardown(ns);
 325         nsim_bpf_uninit(ns);
 326 err_utn_destroy:
 327         rtnl_unlock();
 328         nsim_udp_tunnels_info_destroy(dev);
 329 err_free_netdev:
 330         free_netdev(dev);
 331         return ERR_PTR(err);
 332 }
 333
 334 void nsim_destroy(struct netdevsim *ns)
 335 {
 336         struct net_device *dev = ns->netdev;
 337
 338         rtnl_lock();
 339         unregister_netdevice(dev);
 340         nsim_ipsec_teardown(ns);
 341         nsim_bpf_uninit(ns);
 342         rtnl_unlock();
 343         nsim_udp_tunnels_info_destroy(dev);
 344         free_netdev(dev);
 345 }
 346
 347 static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
 348                          struct netlink_ext_ack *extack)
 349 {
 350         NL_SET_ERR_MSG_MOD(extack, "Please use: echo \"[ID] [PORT_COUNT]\" > /sys/bus/netdevsim/new_device");
 351         return -EOPNOTSUPP;
 352 }
 353
 354 static struct rtnl_link_ops nsim_link_ops __read_mostly = {
 355         .kind           = DRV_NAME,
 356         .validate       = nsim_validate,
 357 };
 358
 359 static int __init nsim_module_init(void)
 360 {
 361         int err;
 362
 363         err = nsim_dev_init();
 364         if (err)
 365                 return err;
 366
 367         err = nsim_bus_init();
 368         if (err)
 369                 goto err_dev_exit;
 370
 371         err = rtnl_link_register(&nsim_link_ops);
 372         if (err)
 373                 goto err_bus_exit;
 374
 375         return 0;
 376
 377 err_bus_exit:
 378         nsim_bus_exit();
 379 err_dev_exit:
 380         nsim_dev_exit();
 381         return err;
 382 }
 383
 384 static void __exit nsim_module_exit(void)
 385 {
 386         rtnl_link_unregister(&nsim_link_ops);
 387         nsim_bus_exit();
 388         nsim_dev_exit();
 389 }
 390
 391 module_init(nsim_module_init);
 392 module_exit(nsim_module_exit);
 393 MODULE_LICENSE("GPL");
 394 MODULE_ALIAS_RTNL_LINK(DRV_NAME);