drivers/net/ethernet/sun/sunvnet.c

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