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
  26 #include "netdevsim.h"
  27
  28 struct nsim_vf_config {
  29         int link_state;
  30         u16 min_tx_rate;
  31         u16 max_tx_rate;
  32         u16 vlan;
  33         __be16 vlan_proto;
  34         u16 qos;
  35         u8 vf_mac[ETH_ALEN];
  36         bool spoofchk_enabled;
  37         bool trusted;
  38         bool rss_query_enabled;
  39 };
  40
  41 static u32 nsim_dev_id;
  42
  43 static int nsim_num_vf(struct device *dev)
  44 {
  45         struct netdevsim *ns = to_nsim(dev);
  46
  47         return ns->num_vfs;
  48 }
  49
  50 static struct bus_type nsim_bus = {
  51         .name           = DRV_NAME,
  52         .dev_name       = DRV_NAME,
  53         .num_vf         = nsim_num_vf,
  54 };
  55
  56 static int nsim_vfs_enable(struct netdevsim *ns, unsigned int num_vfs)
  57 {
  58         ns->vfconfigs = kcalloc(num_vfs, sizeof(struct nsim_vf_config),
  59                                 GFP_KERNEL);
  60         if (!ns->vfconfigs)
  61                 return -ENOMEM;
  62         ns->num_vfs = num_vfs;
  63
  64         return 0;
  65 }
  66
  67 static void nsim_vfs_disable(struct netdevsim *ns)
  68 {
  69         kfree(ns->vfconfigs);
  70         ns->vfconfigs = NULL;
  71         ns->num_vfs = 0;
  72 }
  73
  74 static ssize_t
  75 nsim_numvfs_store(struct device *dev, struct device_attribute *attr,
  76                   const char *buf, size_t count)
  77 {
  78         struct netdevsim *ns = to_nsim(dev);
  79         unsigned int num_vfs;
  80         int ret;
  81
  82         ret = kstrtouint(buf, 0, &num_vfs);
  83         if (ret)
  84                 return ret;
  85
  86         rtnl_lock();
  87         if (ns->num_vfs == num_vfs)
  88                 goto exit_good;
  89         if (ns->num_vfs && num_vfs) {
  90                 ret = -EBUSY;
  91                 goto exit_unlock;
  92         }
  93
  94         if (num_vfs) {
  95                 ret = nsim_vfs_enable(ns, num_vfs);
  96                 if (ret)
  97                         goto exit_unlock;
  98         } else {
  99                 nsim_vfs_disable(ns);
 100         }
 101 exit_good:
 102         ret = count;
 103 exit_unlock:
 104         rtnl_unlock();
 105
 106         return ret;
 107 }
 108
 109 static ssize_t
 110 nsim_numvfs_show(struct device *dev, struct device_attribute *attr, char *buf)
 111 {
 112         struct netdevsim *ns = to_nsim(dev);
 113
 114         return sprintf(buf, "%u\n", ns->num_vfs);
 115 }
 116
 117 static struct device_attribute nsim_numvfs_attr =
 118         __ATTR(sriov_numvfs, 0664, nsim_numvfs_show, nsim_numvfs_store);
 119
 120 static struct attribute *nsim_dev_attrs[] = {
 121         &nsim_numvfs_attr.attr,
 122         NULL,
 123 };
 124
 125 static const struct attribute_group nsim_dev_attr_group = {
 126         .attrs = nsim_dev_attrs,
 127 };
 128
 129 static const struct attribute_group *nsim_dev_attr_groups[] = {
 130         &nsim_dev_attr_group,
 131         NULL,
 132 };
 133
 134 static void nsim_dev_release(struct device *dev)
 135 {
 136         struct netdevsim *ns = to_nsim(dev);
 137
 138         nsim_vfs_disable(ns);
 139         free_netdev(ns->netdev);
 140 }
 141
 142 static struct device_type nsim_dev_type = {
 143         .groups = nsim_dev_attr_groups,
 144         .release = nsim_dev_release,
 145 };
 146
 147 static int nsim_init(struct net_device *dev)
 148 {
 149         struct netdevsim *ns = netdev_priv(dev);
 150         int err;
 151
 152         ns->netdev = dev;
 153         ns->ddir = debugfs_create_dir(netdev_name(dev), nsim_ddir);
 154         if (IS_ERR_OR_NULL(ns->ddir))
 155                 return -ENOMEM;
 156
 157         err = nsim_bpf_init(ns);
 158         if (err)
 159                 goto err_debugfs_destroy;
 160
 161         ns->dev.id = nsim_dev_id++;
 162         ns->dev.bus = &nsim_bus;
 163         ns->dev.type = &nsim_dev_type;
 164         err = device_register(&ns->dev);
 165         if (err)
 166                 goto err_bpf_uninit;
 167
 168         SET_NETDEV_DEV(dev, &ns->dev);
 169
 170         return 0;
 171
 172 err_bpf_uninit:
 173         nsim_bpf_uninit(ns);
 174 err_debugfs_destroy:
 175         debugfs_remove_recursive(ns->ddir);
 176         return err;
 177 }
 178
 179 static void nsim_uninit(struct net_device *dev)
 180 {
 181         struct netdevsim *ns = netdev_priv(dev);
 182
 183         debugfs_remove_recursive(ns->ddir);
 184         nsim_bpf_uninit(ns);
 185 }
 186
 187 static void nsim_free(struct net_device *dev)
 188 {
 189         struct netdevsim *ns = netdev_priv(dev);
 190
 191         device_unregister(&ns->dev);
 192         /* netdev and vf state will be freed out of device_release() */
 193 }
 194
 195 static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
 196 {
 197         struct netdevsim *ns = netdev_priv(dev);
 198
 199         u64_stats_update_begin(&ns->syncp);
 200         ns->tx_packets++;
 201         ns->tx_bytes += skb->len;
 202         u64_stats_update_end(&ns->syncp);
 203
 204         dev_kfree_skb(skb);
 205
 206         return NETDEV_TX_OK;
 207 }
 208
 209 static void nsim_set_rx_mode(struct net_device *dev)
 210 {
 211 }
 212
 213 static int nsim_change_mtu(struct net_device *dev, int new_mtu)
 214 {
 215         struct netdevsim *ns = netdev_priv(dev);
 216
 217         if (ns->xdp_prog_mode == XDP_ATTACHED_DRV &&
 218             new_mtu > NSIM_XDP_MAX_MTU)
 219                 return -EBUSY;
 220
 221         dev->mtu = new_mtu;
 222
 223         return 0;
 224 }
 225
 226 static void
 227 nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 228 {
 229         struct netdevsim *ns = netdev_priv(dev);
 230         unsigned int start;
 231
 232         do {
 233                 start = u64_stats_fetch_begin(&ns->syncp);
 234                 stats->tx_bytes = ns->tx_bytes;
 235                 stats->tx_packets = ns->tx_packets;
 236         } while (u64_stats_fetch_retry(&ns->syncp, start));
 237 }
 238
 239 static int
 240 nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
 241 {
 242         return nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv);
 243 }
 244
 245 static int
 246 nsim_setup_tc_block(struct net_device *dev, struct tc_block_offload *f)
 247 {
 248         struct netdevsim *ns = netdev_priv(dev);
 249
 250         if (f->binder_type != TCF_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
 251                 return -EOPNOTSUPP;
 252
 253         switch (f->command) {
 254         case TC_BLOCK_BIND:
 255                 return tcf_block_cb_register(f->block, nsim_setup_tc_block_cb,
 256                                              ns, ns);
 257         case TC_BLOCK_UNBIND:
 258                 tcf_block_cb_unregister(f->block, nsim_setup_tc_block_cb, ns);
 259                 return 0;
 260         default:
 261                 return -EOPNOTSUPP;
 262         }
 263 }
 264
 265 static int nsim_set_vf_mac(struct net_device *dev, int vf, u8 *mac)
 266 {
 267         struct netdevsim *ns = netdev_priv(dev);
 268
 269         /* Only refuse multicast addresses, zero address can mean unset/any. */
 270         if (vf >= ns->num_vfs || is_multicast_ether_addr(mac))
 271                 return -EINVAL;
 272         memcpy(ns->vfconfigs[vf].vf_mac, mac, ETH_ALEN);
 273
 274         return 0;
 275 }
 276
 277 static int nsim_set_vf_vlan(struct net_device *dev, int vf,
 278                             u16 vlan, u8 qos, __be16 vlan_proto)
 279 {
 280         struct netdevsim *ns = netdev_priv(dev);
 281
 282         if (vf >= ns->num_vfs || vlan > 4095 || qos > 7)
 283                 return -EINVAL;
 284
 285         ns->vfconfigs[vf].vlan = vlan;
 286         ns->vfconfigs[vf].qos = qos;
 287         ns->vfconfigs[vf].vlan_proto = vlan_proto;
 288
 289         return 0;
 290 }
 291
 292 static int nsim_set_vf_rate(struct net_device *dev, int vf, int min, int max)
 293 {
 294         struct netdevsim *ns = netdev_priv(dev);
 295
 296         if (vf >= ns->num_vfs)
 297                 return -EINVAL;
 298
 299         ns->vfconfigs[vf].min_tx_rate = min;
 300         ns->vfconfigs[vf].max_tx_rate = max;
 301
 302         return 0;
 303 }
 304
 305 static int nsim_set_vf_spoofchk(struct net_device *dev, int vf, bool val)
 306 {
 307         struct netdevsim *ns = netdev_priv(dev);
 308
 309         if (vf >= ns->num_vfs)
 310                 return -EINVAL;
 311         ns->vfconfigs[vf].spoofchk_enabled = val;
 312
 313         return 0;
 314 }
 315
 316 static int nsim_set_vf_rss_query_en(struct net_device *dev, int vf, bool val)
 317 {
 318         struct netdevsim *ns = netdev_priv(dev);
 319
 320         if (vf >= ns->num_vfs)
 321                 return -EINVAL;
 322         ns->vfconfigs[vf].rss_query_enabled = val;
 323
 324         return 0;
 325 }
 326
 327 static int nsim_set_vf_trust(struct net_device *dev, int vf, bool val)
 328 {
 329         struct netdevsim *ns = netdev_priv(dev);
 330
 331         if (vf >= ns->num_vfs)
 332                 return -EINVAL;
 333         ns->vfconfigs[vf].trusted = val;
 334
 335         return 0;
 336 }
 337
 338 static int
 339 nsim_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi)
 340 {
 341         struct netdevsim *ns = netdev_priv(dev);
 342
 343         if (vf >= ns->num_vfs)
 344                 return -EINVAL;
 345
 346         ivi->vf = vf;
 347         ivi->linkstate = ns->vfconfigs[vf].link_state;
 348         ivi->min_tx_rate = ns->vfconfigs[vf].min_tx_rate;
 349         ivi->max_tx_rate = ns->vfconfigs[vf].max_tx_rate;
 350         ivi->vlan = ns->vfconfigs[vf].vlan;
 351         ivi->vlan_proto = ns->vfconfigs[vf].vlan_proto;
 352         ivi->qos = ns->vfconfigs[vf].qos;
 353         memcpy(&ivi->mac, ns->vfconfigs[vf].vf_mac, ETH_ALEN);
 354         ivi->spoofchk = ns->vfconfigs[vf].spoofchk_enabled;
 355         ivi->trusted = ns->vfconfigs[vf].trusted;
 356         ivi->rss_query_en = ns->vfconfigs[vf].rss_query_enabled;
 357
 358         return 0;
 359 }
 360
 361 static int nsim_set_vf_link_state(struct net_device *dev, int vf, int state)
 362 {
 363         struct netdevsim *ns = netdev_priv(dev);
 364
 365         if (vf >= ns->num_vfs)
 366                 return -EINVAL;
 367
 368         switch (state) {
 369         case IFLA_VF_LINK_STATE_AUTO:
 370         case IFLA_VF_LINK_STATE_ENABLE:
 371         case IFLA_VF_LINK_STATE_DISABLE:
 372                 break;
 373         default:
 374                 return -EINVAL;
 375         }
 376
 377         ns->vfconfigs[vf].link_state = state;
 378
 379         return 0;
 380 }
 381
 382 static int
 383 nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
 384 {
 385         switch (type) {
 386         case TC_SETUP_BLOCK:
 387                 return nsim_setup_tc_block(dev, type_data);
 388         default:
 389                 return -EOPNOTSUPP;
 390         }
 391 }
 392
 393 static int
 394 nsim_set_features(struct net_device *dev, netdev_features_t features)
 395 {
 396         struct netdevsim *ns = netdev_priv(dev);
 397
 398         if ((dev->features & NETIF_F_HW_TC) > (features & NETIF_F_HW_TC))
 399                 return nsim_bpf_disable_tc(ns);
 400
 401         return 0;
 402 }
 403
 404 static const struct net_device_ops nsim_netdev_ops = {
 405         .ndo_init               = nsim_init,
 406         .ndo_uninit             = nsim_uninit,
 407         .ndo_start_xmit         = nsim_start_xmit,
 408         .ndo_set_rx_mode        = nsim_set_rx_mode,
 409         .ndo_set_mac_address    = eth_mac_addr,
 410         .ndo_validate_addr      = eth_validate_addr,
 411         .ndo_change_mtu         = nsim_change_mtu,
 412         .ndo_get_stats64        = nsim_get_stats64,
 413         .ndo_set_vf_mac         = nsim_set_vf_mac,
 414         .ndo_set_vf_vlan        = nsim_set_vf_vlan,
 415         .ndo_set_vf_rate        = nsim_set_vf_rate,
 416         .ndo_set_vf_spoofchk    = nsim_set_vf_spoofchk,
 417         .ndo_set_vf_trust       = nsim_set_vf_trust,
 418         .ndo_get_vf_config      = nsim_get_vf_config,
 419         .ndo_set_vf_link_state  = nsim_set_vf_link_state,
 420         .ndo_set_vf_rss_query_en = nsim_set_vf_rss_query_en,
 421         .ndo_setup_tc           = nsim_setup_tc,
 422         .ndo_set_features       = nsim_set_features,
 423         .ndo_bpf                = nsim_bpf,
 424 };
 425
 426 static void nsim_setup(struct net_device *dev)
 427 {
 428         ether_setup(dev);
 429         eth_hw_addr_random(dev);
 430
 431         dev->netdev_ops = &nsim_netdev_ops;
 432         dev->priv_destructor = nsim_free;
 433
 434         dev->tx_queue_len = 0;
 435         dev->flags |= IFF_NOARP;
 436         dev->flags &= ~IFF_MULTICAST;
 437         dev->priv_flags |= IFF_LIVE_ADDR_CHANGE |
 438                            IFF_NO_QUEUE;
 439         dev->features |= NETIF_F_HIGHDMA |
 440                          NETIF_F_SG |
 441                          NETIF_F_FRAGLIST |
 442                          NETIF_F_HW_CSUM |
 443                          NETIF_F_TSO;
 444         dev->hw_features |= NETIF_F_HW_TC;
 445         dev->max_mtu = ETH_MAX_MTU;
 446 }
 447
 448 static int nsim_validate(struct nlattr *tb[], struct nlattr *data[],
 449                          struct netlink_ext_ack *extack)
 450 {
 451         if (tb[IFLA_ADDRESS]) {
 452                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 453                         return -EINVAL;
 454                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 455                         return -EADDRNOTAVAIL;
 456         }
 457         return 0;
 458 }
 459
 460 static struct rtnl_link_ops nsim_link_ops __read_mostly = {
 461         .kind           = DRV_NAME,
 462         .priv_size      = sizeof(struct netdevsim),
 463         .setup          = nsim_setup,
 464         .validate       = nsim_validate,
 465 };
 466
 467 struct dentry *nsim_ddir;
 468
 469 static int __init nsim_module_init(void)
 470 {
 471         int err;
 472
 473         nsim_ddir = debugfs_create_dir(DRV_NAME, NULL);
 474         if (IS_ERR_OR_NULL(nsim_ddir))
 475                 return -ENOMEM;
 476
 477         err = bus_register(&nsim_bus);
 478         if (err)
 479                 goto err_debugfs_destroy;
 480
 481         err = rtnl_link_register(&nsim_link_ops);
 482         if (err)
 483                 goto err_unreg_bus;
 484
 485         return 0;
 486
 487 err_unreg_bus:
 488         bus_unregister(&nsim_bus);
 489 err_debugfs_destroy:
 490         debugfs_remove_recursive(nsim_ddir);
 491         return err;
 492 }
 493
 494 static void __exit nsim_module_exit(void)
 495 {
 496         rtnl_link_unregister(&nsim_link_ops);
 497         bus_unregister(&nsim_bus);
 498         debugfs_remove_recursive(nsim_ddir);
 499 }
 500
 501 module_init(nsim_module_init);
 502 module_exit(nsim_module_exit);
 503 MODULE_LICENSE("GPL");
 504 MODULE_ALIAS_RTNL_LINK(DRV_NAME);