drivers/net/ethernet/sun/sunvnet.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* sunvnet.c: Sun LDOM Virtual Network Driver.
   3  *
   4  * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
   5  * Copyright (C) 2016-2017 Oracle. All rights reserved.
   6  */
   7
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/init.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/ethtool.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/mutex.h>
  20 #include <linux/highmem.h>
  21 #include <linux/if_vlan.h>
  22
  23 #if IS_ENABLED(CONFIG_IPV6)
  24 #include <linux/icmpv6.h>
  25 #endif
  26
  27 #include <net/ip.h>
  28 #include <net/icmp.h>
  29 #include <net/route.h>
  30
  31 #include <asm/vio.h>
  32 #include <asm/ldc.h>
  33
  34 #include "sunvnet_common.h"
  35
  36 /* length of time before we decide the hardware is borked,
  37  * and dev->tx_timeout() should be called to fix the problem
  38  */
  39 #define VNET_TX_TIMEOUT                 (5 * HZ)
  40
  41 #define DRV_MODULE_NAME         "sunvnet"
  42 #define DRV_MODULE_VERSION      "2.0"
  43 #define DRV_MODULE_RELDATE      "February 3, 2017"
  44
  45 static char version[] =
  46         DRV_MODULE_NAME " " DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")";
  47 MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
  48 MODULE_DESCRIPTION("Sun LDOM virtual network driver");
  49 MODULE_LICENSE("GPL");
  50 MODULE_VERSION(DRV_MODULE_VERSION);
  51
  52 /* Ordered from largest major to lowest */
  53 static struct vio_version vnet_versions[] = {
  54         { .major = 1, .minor = 8 },
  55         { .major = 1, .minor = 7 },
  56         { .major = 1, .minor = 6 },
  57         { .major = 1, .minor = 0 },
  58 };
  59
  60 static void vnet_get_drvinfo(struct net_device *dev,
  61                              struct ethtool_drvinfo *info)
  62 {
  63         strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
  64         strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->version));
  65 }
  66
  67 static u32 vnet_get_msglevel(struct net_device *dev)
  68 {
  69         struct vnet *vp = netdev_priv(dev);
  70
  71         return vp->msg_enable;
  72 }
  73
  74 static void vnet_set_msglevel(struct net_device *dev, u32 value)
  75 {
  76         struct vnet *vp = netdev_priv(dev);
  77
  78         vp->msg_enable = value;
  79 }
  80
  81 static const struct {
  82         const char string[ETH_GSTRING_LEN];
  83 } ethtool_stats_keys[] = {
  84         { "rx_packets" },
  85         { "tx_packets" },
  86         { "rx_bytes" },
  87         { "tx_bytes" },
  88         { "rx_errors" },
  89         { "tx_errors" },
  90         { "rx_dropped" },
  91         { "tx_dropped" },
  92         { "multicast" },
  93         { "rx_length_errors" },
  94         { "rx_frame_errors" },
  95         { "rx_missed_errors" },
  96         { "tx_carrier_errors" },
  97         { "nports" },
  98 };
  99
 100 static int vnet_get_sset_count(struct net_device *dev, int sset)
 101 {
 102         struct vnet *vp = (struct vnet *)netdev_priv(dev);
 103
 104         switch (sset) {
 105         case ETH_SS_STATS:
 106                 return ARRAY_SIZE(ethtool_stats_keys)
 107                         + (NUM_VNET_PORT_STATS * vp->nports);
 108         default:
 109                 return -EOPNOTSUPP;
 110         }
 111 }
 112
 113 static void vnet_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
 114 {
 115         struct vnet *vp = (struct vnet *)netdev_priv(dev);
 116         struct vnet_port *port;
 117         char *p = (char *)buf;
 118
 119         switch (stringset) {
 120         case ETH_SS_STATS:
 121                 memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
 122                 p += sizeof(ethtool_stats_keys);
 123
 124                 rcu_read_lock();
 125                 list_for_each_entry_rcu(port, &vp->port_list, list) {
 126                         snprintf(p, ETH_GSTRING_LEN, "p%u.%s-%pM",
 127                                  port->q_index, port->switch_port ? "s" : "q",
 128                                  port->raddr);
 129                         p += ETH_GSTRING_LEN;
 130                         snprintf(p, ETH_GSTRING_LEN, "p%u.rx_packets",
 131                                  port->q_index);
 132                         p += ETH_GSTRING_LEN;
 133                         snprintf(p, ETH_GSTRING_LEN, "p%u.tx_packets",
 134                                  port->q_index);
 135                         p += ETH_GSTRING_LEN;
 136                         snprintf(p, ETH_GSTRING_LEN, "p%u.rx_bytes",
 137                                  port->q_index);
 138                         p += ETH_GSTRING_LEN;
 139                         snprintf(p, ETH_GSTRING_LEN, "p%u.tx_bytes",
 140                                  port->q_index);
 141                         p += ETH_GSTRING_LEN;
 142                         snprintf(p, ETH_GSTRING_LEN, "p%u.event_up",
 143                                  port->q_index);
 144                         p += ETH_GSTRING_LEN;
 145                         snprintf(p, ETH_GSTRING_LEN, "p%u.event_reset",
 146                                  port->q_index);
 147                         p += ETH_GSTRING_LEN;
 148                 }
 149                 rcu_read_unlock();
 150                 break;
 151         default:
 152                 WARN_ON(1);
 153                 break;
 154         }
 155 }
 156
 157 static void vnet_get_ethtool_stats(struct net_device *dev,
 158                                    struct ethtool_stats *estats, u64 *data)
 159 {
 160         struct vnet *vp = (struct vnet *)netdev_priv(dev);
 161         struct vnet_port *port;
 162         int i = 0;
 163
 164         data[i++] = dev->stats.rx_packets;
 165         data[i++] = dev->stats.tx_packets;
 166         data[i++] = dev->stats.rx_bytes;
 167         data[i++] = dev->stats.tx_bytes;
 168         data[i++] = dev->stats.rx_errors;
 169         data[i++] = dev->stats.tx_errors;
 170         data[i++] = dev->stats.rx_dropped;
 171         data[i++] = dev->stats.tx_dropped;
 172         data[i++] = dev->stats.multicast;
 173         data[i++] = dev->stats.rx_length_errors;
 174         data[i++] = dev->stats.rx_frame_errors;
 175         data[i++] = dev->stats.rx_missed_errors;
 176         data[i++] = dev->stats.tx_carrier_errors;
 177         data[i++] = vp->nports;
 178
 179         rcu_read_lock();
 180         list_for_each_entry_rcu(port, &vp->port_list, list) {
 181                 data[i++] = port->q_index;
 182                 data[i++] = port->stats.rx_packets;
 183                 data[i++] = port->stats.tx_packets;
 184                 data[i++] = port->stats.rx_bytes;
 185                 data[i++] = port->stats.tx_bytes;
 186                 data[i++] = port->stats.event_up;
 187                 data[i++] = port->stats.event_reset;
 188         }
 189         rcu_read_unlock();
 190 }
 191
 192 static const struct ethtool_ops vnet_ethtool_ops = {
 193         .get_drvinfo            = vnet_get_drvinfo,
 194         .get_msglevel           = vnet_get_msglevel,
 195         .set_msglevel           = vnet_set_msglevel,
 196         .get_link               = ethtool_op_get_link,
 197         .get_sset_count         = vnet_get_sset_count,
 198         .get_strings            = vnet_get_strings,
 199         .get_ethtool_stats      = vnet_get_ethtool_stats,
 200 };
 201
 202 static LIST_HEAD(vnet_list);
 203 static DEFINE_MUTEX(vnet_list_mutex);
 204
 205 static struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
 206 {
 207         unsigned int hash = vnet_hashfn(skb->data);
 208         struct hlist_head *hp = &vp->port_hash[hash];
 209         struct vnet_port *port;
 210
 211         hlist_for_each_entry_rcu(port, hp, hash) {
 212                 if (!sunvnet_port_is_up_common(port))
 213                         continue;
 214                 if (ether_addr_equal(port->raddr, skb->data))
 215                         return port;
 216         }
 217         list_for_each_entry_rcu(port, &vp->port_list, list) {
 218                 if (!port->switch_port)
 219                         continue;
 220                 if (!sunvnet_port_is_up_common(port))
 221                         continue;
 222                 return port;
 223         }
 224         return NULL;
 225 }
 226
 227 /* func arg to vnet_start_xmit_common() to get the proper tx port */
 228 static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb,
 229                                            struct net_device *dev)
 230 {
 231         struct vnet *vp = netdev_priv(dev);
 232
 233         return __tx_port_find(vp, skb);
 234 }
 235
 236 static u16 vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
 237                              void *accel_priv, select_queue_fallback_t fallback)
 238 {
 239         struct vnet *vp = netdev_priv(dev);
 240         struct vnet_port *port = __tx_port_find(vp, skb);
 241
 242         if (!port)
 243                 return 0;
 244
 245         return port->q_index;
 246 }
 247
 248 /* Wrappers to common functions */
 249 static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 250 {
 251         return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
 252 }
 253
 254 static void vnet_set_rx_mode(struct net_device *dev)
 255 {
 256         struct vnet *vp = netdev_priv(dev);
 257
 258         return sunvnet_set_rx_mode_common(dev, vp);
 259 }
 260
 261 #ifdef CONFIG_NET_POLL_CONTROLLER
 262 static void vnet_poll_controller(struct net_device *dev)
 263 {
 264         struct vnet *vp = netdev_priv(dev);
 265
 266         return sunvnet_poll_controller_common(dev, vp);
 267 }
 268 #endif
 269
 270 static const struct net_device_ops vnet_ops = {
 271         .ndo_open               = sunvnet_open_common,
 272         .ndo_stop               = sunvnet_close_common,
 273         .ndo_set_rx_mode        = vnet_set_rx_mode,
 274         .ndo_set_mac_address    = sunvnet_set_mac_addr_common,
 275         .ndo_validate_addr      = eth_validate_addr,
 276         .ndo_tx_timeout         = sunvnet_tx_timeout_common,
 277         .ndo_start_xmit         = vnet_start_xmit,
 278         .ndo_select_queue       = vnet_select_queue,
 279 #ifdef CONFIG_NET_POLL_CONTROLLER
 280         .ndo_poll_controller    = vnet_poll_controller,
 281 #endif
 282 };
 283
 284 static struct vnet *vnet_new(const u64 *local_mac,
 285                              struct vio_dev *vdev)
 286 {
 287         struct net_device *dev;
 288         struct vnet *vp;
 289         int err, i;
 290
 291         dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
 292         if (!dev)
 293                 return ERR_PTR(-ENOMEM);
 294         dev->needed_headroom = VNET_PACKET_SKIP + 8;
 295         dev->needed_tailroom = 8;
 296
 297         for (i = 0; i < ETH_ALEN; i++)
 298                 dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
 299
 300         vp = netdev_priv(dev);
 301
 302         spin_lock_init(&vp->lock);
 303         vp->dev = dev;
 304
 305         INIT_LIST_HEAD(&vp->port_list);
 306         for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
 307                 INIT_HLIST_HEAD(&vp->port_hash[i]);
 308         INIT_LIST_HEAD(&vp->list);
 309         vp->local_mac = *local_mac;
 310
 311         dev->netdev_ops = &vnet_ops;
 312         dev->ethtool_ops = &vnet_ethtool_ops;
 313         dev->watchdog_timeo = VNET_TX_TIMEOUT;
 314
 315         dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_ALL_TSO |
 316                            NETIF_F_HW_CSUM | NETIF_F_SG;
 317         dev->features = dev->hw_features;
 318
 319         /* MTU range: 68 - 65535 */
 320         dev->min_mtu = ETH_MIN_MTU;
 321         dev->max_mtu = VNET_MAX_MTU;
 322
 323         SET_NETDEV_DEV(dev, &vdev->dev);
 324
 325         err = register_netdev(dev);
 326         if (err) {
 327                 pr_err("Cannot register net device, aborting\n");
 328                 goto err_out_free_dev;
 329         }
 330
 331         netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
 332
 333         list_add(&vp->list, &vnet_list);
 334
 335         return vp;
 336
 337 err_out_free_dev:
 338         free_netdev(dev);
 339
 340         return ERR_PTR(err);
 341 }
 342
 343 static struct vnet *vnet_find_or_create(const u64 *local_mac,
 344                                         struct vio_dev *vdev)
 345 {
 346         struct vnet *iter, *vp;
 347
 348         mutex_lock(&vnet_list_mutex);
 349         vp = NULL;
 350         list_for_each_entry(iter, &vnet_list, list) {
 351                 if (iter->local_mac == *local_mac) {
 352                         vp = iter;
 353                         break;
 354                 }
 355         }
 356         if (!vp)
 357                 vp = vnet_new(local_mac, vdev);
 358         mutex_unlock(&vnet_list_mutex);
 359
 360         return vp;
 361 }
 362
 363 static void vnet_cleanup(void)
 364 {
 365         struct vnet *vp;
 366         struct net_device *dev;
 367
 368         mutex_lock(&vnet_list_mutex);
 369         while (!list_empty(&vnet_list)) {
 370                 vp = list_first_entry(&vnet_list, struct vnet, list);
 371                 list_del(&vp->list);
 372                 dev = vp->dev;
 373                 /* vio_unregister_driver() should have cleaned up port_list */
 374                 BUG_ON(!list_empty(&vp->port_list));
 375                 unregister_netdev(dev);
 376                 free_netdev(dev);
 377         }
 378         mutex_unlock(&vnet_list_mutex);
 379 }
 380
 381 static const char *local_mac_prop = "local-mac-address";
 382
 383 static struct vnet *vnet_find_parent(struct mdesc_handle *hp,
 384                                      u64 port_node,
 385                                      struct vio_dev *vdev)
 386 {
 387         const u64 *local_mac = NULL;
 388         u64 a;
 389
 390         mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
 391                 u64 target = mdesc_arc_target(hp, a);
 392                 const char *name;
 393
 394                 name = mdesc_get_property(hp, target, "name", NULL);
 395                 if (!name || strcmp(name, "network"))
 396                         continue;
 397
 398                 local_mac = mdesc_get_property(hp, target,
 399                                                local_mac_prop, NULL);
 400                 if (local_mac)
 401                         break;
 402         }
 403         if (!local_mac)
 404                 return ERR_PTR(-ENODEV);
 405
 406         return vnet_find_or_create(local_mac, vdev);
 407 }
 408
 409 static struct ldc_channel_config vnet_ldc_cfg = {
 410         .event          = sunvnet_event_common,
 411         .mtu            = 64,
 412         .mode           = LDC_MODE_UNRELIABLE,
 413 };
 414
 415 static struct vio_driver_ops vnet_vio_ops = {
 416         .send_attr              = sunvnet_send_attr_common,
 417         .handle_attr            = sunvnet_handle_attr_common,
 418         .handshake_complete     = sunvnet_handshake_complete_common,
 419 };
 420
 421 const char *remote_macaddr_prop = "remote-mac-address";
 422
 423 static int vnet_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 424 {
 425         struct mdesc_handle *hp;
 426         struct vnet_port *port;
 427         unsigned long flags;
 428         struct vnet *vp;
 429         const u64 *rmac;
 430         int len, i, err, switch_port;
 431
 432         hp = mdesc_grab();
 433
 434         vp = vnet_find_parent(hp, vdev->mp, vdev);
 435         if (IS_ERR(vp)) {
 436                 pr_err("Cannot find port parent vnet\n");
 437                 err = PTR_ERR(vp);
 438                 goto err_out_put_mdesc;
 439         }
 440
 441         rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
 442         err = -ENODEV;
 443         if (!rmac) {
 444                 pr_err("Port lacks %s property\n", remote_macaddr_prop);
 445                 goto err_out_put_mdesc;
 446         }
 447
 448         port = kzalloc(sizeof(*port), GFP_KERNEL);
 449         err = -ENOMEM;
 450         if (!port)
 451                 goto err_out_put_mdesc;
 452
 453         for (i = 0; i < ETH_ALEN; i++)
 454                 port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
 455
 456         port->vp = vp;
 457
 458         err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
 459                               vnet_versions, ARRAY_SIZE(vnet_versions),
 460                               &vnet_vio_ops, vp->dev->name);
 461         if (err)
 462                 goto err_out_free_port;
 463
 464         err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
 465         if (err)
 466                 goto err_out_free_port;
 467
 468         netif_napi_add(port->vp->dev, &port->napi, sunvnet_poll_common,
 469                        NAPI_POLL_WEIGHT);
 470
 471         INIT_HLIST_NODE(&port->hash);
 472         INIT_LIST_HEAD(&port->list);
 473
 474         switch_port = 0;
 475         if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL))
 476                 switch_port = 1;
 477         port->switch_port = switch_port;
 478         port->tso = true;
 479         port->tsolen = 0;
 480
 481         spin_lock_irqsave(&vp->lock, flags);
 482         if (switch_port)
 483                 list_add_rcu(&port->list, &vp->port_list);
 484         else
 485                 list_add_tail_rcu(&port->list, &vp->port_list);
 486         hlist_add_head_rcu(&port->hash,
 487                            &vp->port_hash[vnet_hashfn(port->raddr)]);
 488         sunvnet_port_add_txq_common(port);
 489         spin_unlock_irqrestore(&vp->lock, flags);
 490
 491         dev_set_drvdata(&vdev->dev, port);
 492
 493         pr_info("%s: PORT ( remote-mac %pM%s )\n",
 494                 vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
 495
 496         timer_setup(&port->clean_timer, sunvnet_clean_timer_expire_common, 0);
 497
 498         napi_enable(&port->napi);
 499         vio_port_up(&port->vio);
 500
 501         mdesc_release(hp);
 502
 503         return 0;
 504
 505 err_out_free_port:
 506         kfree(port);
 507
 508 err_out_put_mdesc:
 509         mdesc_release(hp);
 510         return err;
 511 }
 512
 513 static int vnet_port_remove(struct vio_dev *vdev)
 514 {
 515         struct vnet_port *port = dev_get_drvdata(&vdev->dev);
 516
 517         if (port) {
 518                 del_timer_sync(&port->vio.timer);
 519
 520                 napi_disable(&port->napi);
 521
 522                 list_del_rcu(&port->list);
 523                 hlist_del_rcu(&port->hash);
 524
 525                 synchronize_rcu();
 526                 del_timer_sync(&port->clean_timer);
 527                 sunvnet_port_rm_txq_common(port);
 528                 netif_napi_del(&port->napi);
 529                 sunvnet_port_free_tx_bufs_common(port);
 530                 vio_ldc_free(&port->vio);
 531
 532                 dev_set_drvdata(&vdev->dev, NULL);
 533
 534                 kfree(port);
 535         }
 536         return 0;
 537 }
 538
 539 static const struct vio_device_id vnet_port_match[] = {
 540         {
 541                 .type = "vnet-port",
 542         },
 543         {},
 544 };
 545 MODULE_DEVICE_TABLE(vio, vnet_port_match);
 546
 547 static struct vio_driver vnet_port_driver = {
 548         .id_table       = vnet_port_match,
 549         .probe          = vnet_port_probe,
 550         .remove         = vnet_port_remove,
 551         .name           = "vnet_port",
 552 };
 553
 554 static int __init vnet_init(void)
 555 {
 556         pr_info("%s\n", version);
 557         return vio_register_driver(&vnet_port_driver);
 558 }
 559
 560 static void __exit vnet_exit(void)
 561 {
 562         vio_unregister_driver(&vnet_port_driver);
 563         vnet_cleanup();
 564 }
 565
 566 module_init(vnet_init);
 567 module_exit(vnet_exit);